Retractable writing instrument and multi-core writing instrument
阅读说明：本技术 伸缩式书写工具和多芯书写工具 (Retractable writing instrument and multi-core writing instrument ) 是由 光崎嘉人 于 2018-12-18 设计创作，主要内容包括：本发明具有轴筒、笔尖保持架、笔尖、环状部件和弹性部件,其中,轴筒在前端具有开口；笔尖保持架能够沿轴筒的轴向移动；笔尖随着笔尖保持架的移动而能够伸缩；环状部件松动地嵌合于笔尖保持架的外周,能够沿轴向移动；弹性部件将笔尖保持架和环状部件以可彼此相对移动的方式连接。在环状部件的外周的至少一部分上形成有抵接面,该抵接面随着靠向前端而呈尖细状,在环状部件的一部分上形成有缺口,在所述抵接面上承受载荷时使环状部件的内径缩径。在所述轴筒的内表面的一部分上形成有引导面,该引导面随着靠向前端而呈尖细状,所述抵接面随着所述笔尖保持架向前端侧的移动而承受来自所述引导面的所述载荷。(The invention has a shaft cylinder, a pen point holder, a pen point, an annular component and an elastic component, wherein the shaft cylinder is provided with an opening at the front end; the pen point retainer can move along the axial direction of the shaft barrel; the pen point can stretch along with the movement of the pen point retainer; the annular component is loosely embedded on the periphery of the pen point retainer and can move along the axial direction; the elastic member connects the pen tip holder and the annular member to be movable relative to each other. A contact surface that tapers toward the front end is formed on at least a portion of the outer periphery of the annular member, a notch is formed on a portion of the annular member, and the inner diameter of the annular member is reduced when a load is applied to the contact surface. A guide surface that tapers toward the tip end is formed on a part of the inner surface of the barrel, and the contact surface receives the load from the guide surface as the nib holder moves toward the tip end.)
1. A retractable writing instrument is characterized in that,
comprises a shaft cylinder, a pen point holder, a pen point, a ring component and an elastic component, wherein,
the shaft barrel has an opening at a front end;
the nib holder is accommodated in the shaft cylinder and is capable of moving in the axial direction of the shaft cylinder;
the pen tip is fixed to a front end of the pen tip holder and is capable of extending and contracting from the opening of the shaft tube in accordance with movement of the pen tip holder;
the annular member is loosely fitted to an outer periphery of the nib holder or the nib and is movable in an axial direction of the nib holder or the nib relative to the nib holder or the nib;
the elastic member connects the nib holder and the annular member movably relative to each other,
a contact surface that comes into contact with a part of the inner surface of the barrel in accordance with the movement of the tip holder toward the distal end side is formed on at least a part of the outer periphery of the annular member,
a notch is formed in a part of the annular member, and the inner diameter of the annular member is reduced when a load is applied to the contact surface,
a guide surface that comes into contact with the contact surface as the tip holder moves toward the tip end side is formed on a part of the inner surface of the barrel,
the contact surface receives the load from the guide surface as the tip holder moves toward the tip end side.
2. The retractable writing instrument of claim 1,
a plurality of the notches are arranged at equal intervals along the circumferential direction of the annular component,
each of the plurality of notches is a slit extending in the axial direction of the annular member.
3. The retractable writing instrument of claim 1 or 2,
the abutting surface is tapered along with the front end,
the guide surface is tapered toward the front end.
4. The retractable writing instrument of claim 3,
the abutment surface has a frustoconical surface.
5. The retractable writing instrument according to any one of claims 1 to 4,
the elastic member is a coil spring.
6. The retractable writing instrument according to any one of claims 1 to 4,
the elastic member is a cylindrical resin spring member formed with a plurality of slits extending in a direction perpendicular to the axial direction.
7. The retractable writing instrument of claim 6,
the ring member is integrally formed with the resin spring member.
8. The retractable writing instrument according to any one of claims 1 to 7,
the elastic component and the pen point holder are connected through an annular lantern ring,
the elastic member and the annular collar are fixed to each other,
the annular collar and the shaft cylinder are fixed to each other by a 2 nd elastic member.
9. The retractable writing instrument of claim 8,
the displacement amount of the 2 nd elastic member accompanying the movement of the pen tip holder is larger than the displacement amount of the elastic member accompanying the movement of the pen tip holder.
10. A shaft tube for a retractable writing instrument, the shaft tube having an opening at a distal end thereof, the shaft tube being configured to accommodate a pen tip holder having a pen tip fixed to the distal end thereof so as to be movable in an axial direction, the shaft tube being configured such that the pen tip can be retracted from the opening in accordance with movement of the pen tip holder,
having an annular member, an annular collar and a 2 nd elastic member, wherein,
the annular member is loosely fitted to an outer periphery of the pen tip holder or the pen tip in a state where the pen tip holder is accommodated, and is configured to be movable in an axial direction of the pen tip holder or the pen tip with respect to the pen tip holder or the pen tip when the annular member is loosely fitted;
the annular collar is connected to the annular member via an elastic member and is capable of abutting against the pen tip holder in accordance with relative movement of the pen tip holder toward the tip end side;
the 2 nd elastic member supports the annular collar on the inner surface of the shaft tube,
a contact surface that comes into contact with a part of the inner surface of the barrel in accordance with the movement of the tip holder toward the distal end side is formed on at least a part of the outer periphery of the annular member,
a notch is formed in a part of the annular member, and the inner diameter of the annular member is reduced when a load is applied to the contact surface,
a guide surface that comes into contact with the contact surface as the tip holder moves toward the tip end side is formed on a part of the inner surface of the barrel,
the contact surface receives the load from the guide surface as the tip holder moves toward the tip end side.
11. The barrel for a retractable writing instrument of claim 10,
a plurality of the notches are arranged at equal intervals along the circumferential direction of the annular component,
each of the plurality of notches is a slit extending in the axial direction of the annular member.
12. The barrel for a retractable writing instrument according to claim 10 or 11,
the abutting surface is tapered along with the front end,
the guide surface is tapered toward the front end.
13. The barrel for a retractable writing instrument of claim 12,
the abutment surface has a frustoconical surface.
14. The barrel for a retractable writing instrument according to any one of claims 10 to 13,
the elastic member is a coil spring.
15. The barrel for a retractable writing instrument according to any one of claims 10 to 13,
the elastic member is a cylindrical resin spring member formed with a plurality of slits extending in a direction perpendicular to the axial direction.
16. The barrel for a retractable writing instrument of claim 15,
the ring member is integrally formed with the resin spring member.
17. The barrel for a retractable writing instrument according to any one of claims 10 to 16,
the displacement amount of the 2 nd elastic member accompanying the movement of the pen tip holder is larger than the displacement amount of the elastic member accompanying the movement of the pen tip holder.
18. A multi-core writing instrument is characterized in that,
comprising a shaft, a plurality of nib holders, a nib, an annular member, and an elastic member,
the shaft barrel has an opening at a front end;
the plurality of nib holders are housed inside the shaft tube and are movable in the axial direction of the shaft tube;
the pen tips are fixed to the tip ends of the pen tip holders and are extendable from the openings of the shaft tube in accordance with the movement of the pen tip holders;
the annular member is loosely fitted to the outer periphery of each pen tip or each pen tip holder fixed to each pen tip, and is movable relative to the pen tip in the axial direction of the pen tip;
the elastic member connects the nib holder and the annular member movably relative to each other,
a contact surface that comes into contact with a part of the inner surface of the shaft tube in accordance with movement of a tip holder connected to the annular member toward a tip end side is formed on at least a part of an outer periphery of the annular member,
a notch is formed in a part of the annular member, and the inner diameter of the annular member is reduced when a load is applied to the contact surface,
a guide surface that comes into contact with the contact surface as the tip holder moves toward the tip end side is formed on a part of the inner surface of the barrel,
the contact surface receives the load from the guide surface as the tip holder connected to the annular member having the contact surface moves toward the tip end side.
19. The multiple core writing instrument of claim 18,
a plurality of the notches are arranged at equal intervals in the circumferential direction of the annular member,
each of the plurality of notches is a slit extending in the axial direction of the annular member.
20. The retractable writing instrument of claim 18 or 19,
the abutting surface is tapered along with the front end,
the guide surface is tapered toward the front end.
21. The multiple core writing instrument of claim 20,
the abutment surface has a frustoconical surface.
22. The multiple core writing instrument of any one of claims 18 to 21,
the elastic member is a cylindrical resin spring member formed with a plurality of slits extending in a direction perpendicular to the axial direction.
23. The multiple core writing instrument of claim 22,
the ring member is integrally formed with the resin spring member.
24. The multiple core writing instrument of any one of claims 18 to 23,
one of the plurality of pen point holders holds the friction member as a pen point.
25. The multiple core writing instrument of any one of claims 18 to 24,
an operating body having an operating part is provided on the rear end side of each pen tip holder,
a plurality of window holes are distributed on the side wall of the shaft cylinder and penetrate through the side wall along the radial direction, the window holes extend along the front-back direction,
the operation part of each operation body protrudes from the corresponding window hole to the radial outside,
a locking wall portion is provided inside the shaft tube, and the locking wall portion can lock a part of an operation body corresponding to an operation portion when the operation portion slides forwards,
a plurality of coil springs are provided inside the shaft tube, and each coil spring biases the plurality of nib holders rearward,
the tip end sides of the plurality of coil springs are supported by a spring support body fixed to the shaft tube,
the spring support body is provided with a plurality of inner holes, and the plurality of inner holes can be respectively inserted by the plurality of nib holders.
26. A multi-core writing instrument is characterized in that,
comprising a barrel, a plurality of nib holders, a nib, an annular member, an annular collar and a 2 nd elastic member, wherein,
the shaft barrel has an opening at a front end;
the plurality of nib holders are housed inside the shaft tube and are movable in the axial direction of the shaft tube;
the pen tips are fixed to the tip ends of the pen tip holders and are extendable from the openings of the shaft tube in accordance with the movement of the pen tip holders;
the annular member is configured to be loosely fitted to one of the plurality of tip holders or an outer periphery of a tip fixed to the one tip holder in accordance with movement of the tip holder toward a tip end side, and to be movable in an axial direction of the one tip holder or the tip with respect to the one tip holder or the tip when loosely fitted;
the annular collar is connected to the annular member via an elastic member and is capable of abutting against the one pen tip holder in accordance with movement of the one pen tip holder toward the tip end side;
the 2 nd elastic member supports the annular collar on the inner surface of the shaft tube,
a contact surface that is formed on at least a part of an outer periphery of the annular member and contacts a part of an inner surface of the barrel when the annular member is moved toward the tip end side by the annular collar and the elastic member in accordance with the movement of the one tip holder toward the tip end side,
a notch is formed in a part of the annular member, and the inner diameter of the annular member is reduced when a load is applied to the contact surface,
a guide surface that comes into contact with the abutment surface in accordance with movement of the one pen tip holder toward the tip end side is formed on a part of an inner surface of the barrel,
the contact surface receives the load from the guide surface when the annular member is moved toward the tip end side by the annular collar and the elastic member in accordance with the movement of the one tip holder toward the tip end side.
27. The multiple core writing instrument of claim 26,
a plurality of the notches are arranged at equal intervals in the circumferential direction of the annular member,
each of the plurality of notches is a slit extending in the axial direction of the annular member.
28. The retractable writing instrument of claim 26 or 27,
the abutting surface is tapered along with the front end,
the guide surface is tapered toward the front end.
29. The multiple core writing instrument of claim 28,
the abutment surface has a frustoconical surface.
30. The multiple core writing instrument of any one of claims 26 to 29,
the elastic member is a cylindrical resin spring member formed with a plurality of slits extending in a direction perpendicular to the axial direction.
31. The multiple core writing instrument of claim 30,
the annular member and the annular collar are integrally molded with the resin spring member.
32. A barrel for a multi-core writing instrument, the barrel having an opening at a distal end thereof, the barrel being configured to accommodate a plurality of tip holders having tips fixed to the distal end thereof so as to be movable in an axial direction, the barrel being configured such that the tip fixed to one of the tip holders can be extended and contracted from the opening in accordance with movement of the one of the tip holders,
having an annular member, an annular collar and a 2 nd elastic member, wherein,
the annular member is configured to be loosely fitted to the one pen tip holder or an outer periphery of a pen tip fixed to the one pen tip holder in accordance with movement of the one pen tip holder toward a tip end side, and to be movable in an axial direction of the one pen tip holder or the pen tip with respect to the one pen tip holder or the pen tip at the time of the loose fitting;
the annular collar is connected to the annular member via an elastic member and is capable of abutting against the one pen tip holder in accordance with movement of the one pen tip holder toward the tip end side;
the 2 nd elastic member supports the annular collar on the inner surface of the shaft tube,
a contact surface that is formed on at least a part of an outer periphery of the annular member and contacts a part of an inner surface of the barrel when the annular member is moved toward the tip end side by the annular collar and the elastic member in accordance with the movement of the one tip holder toward the tip end side,
a notch is formed in a part of the annular member, and the inner diameter of the annular member is reduced when a load is applied to the contact surface,
a guide surface that comes into contact with the abutment surface in accordance with movement of the one pen tip holder toward the tip end side is formed on a part of an inner surface of the barrel,
the contact surface receives the load from the guide surface when the annular member is moved toward the tip end side by the annular collar and the elastic member in accordance with the movement of the one tip holder toward the tip end side.
33. The barrel for a multiple writing instrument of claim 32,
a plurality of the notches are arranged at equal intervals in the circumferential direction of the annular member,
each of the plurality of notches is a slit extending in the axial direction of the annular member.
34. The barrel for a multi-refill writing instrument as claimed in claim 32 or 33,
the abutting surface is tapered along with the front end,
the guide surface is tapered toward the front end.
35. The barrel for a multiple writing instrument of claim 34,
the abutment surface has a frustoconical surface.
36. The barrel for a multi-refill writing instrument as claimed in any one of claims 32 to 34,
the elastic member is a cylindrical resin spring member formed with a plurality of slits extending in a direction perpendicular to the axial direction.
37. The barrel for a multiple writing instrument of claim 36,
the annular member and the annular collar are integrally molded with the resin spring member.
Technical Field
The present invention relates to a retractable writing instrument in which a pen tip is retractable from an opening of a barrel in accordance with movement of a pen tip holder (chipholder). In addition, the present invention relates to a multi-core writing instrument. In particular, the present invention relates to a multi-core writing instrument capable of accommodating a plurality of writing bodies in a barrel.
Background
Japanese Utility model laid-open publication No. Hei 5-85683 (patent document 1) discloses a vibration-proof device for a writing tip portion. In this device, a recessed groove is provided at an appropriate position of the writing tip portion, and an elastic O-ring having an outer diameter substantially equal to the inner diameter of the shaft barrel tip portion is fitted in the recessed groove. According to this device, in a pencil type or knock type writing instrument, rattling noise generated by the contact of the writing tip portion with the tip hole of the tip portion of the barrel during writing can be prevented.
Japanese Utility model laid-open publication No. Hei 5-93884 (patent document 2) also discloses a vibration-proof device for a writing tip portion. In this device, an elastic ring having an inner diameter slightly smaller than an outer diameter of the writing tip portion is engaged with an engaging stepped portion provided in the tip end of the shaft tube. According to this device, since the elastic ring engages with the writing tip portion, even if a gap is formed between the tip inner diameter of the barrel and the writing tip portion, the shaking during writing can be prevented.
Japanese patent laid-open publication No. 2013-220602 (patent document 3) discloses a multi-core writing instrument configured to slide a writing section of a writing body in a front-rear direction with respect to a shaft tube and to be fed out from an opening of the shaft tube. An annular member is disposed on the outer periphery of the tip end of each writing body, and a substantially spherical inner surface against which the annular member abuts is formed on the inner surface of the periphery of the opening at the tip end of the shaft tube through which the writing section moves in and out. The ring member is fixed to the writing body via a spring and biased forward. When the writing section is fed out, the annular member is brought into close contact with the inner surface of the tip end of the shaft tube by the elastic force of the spring. This prevents jolting during writing.
[ Prior art documents ]
[ patent document ]
Patent document 1 cited in the present specification is japanese utility model laid-open publication No. hei 5-85683, patent document 2 cited in the present specification is japanese utility model laid-open publication No. hei 5-93884, and patent document 3 cited in the present specification is japanese invention laid-open publication No. 2013-220602.
Disclosure of Invention
[ problem to be solved by the invention ]
In the techniques disclosed in japanese utility model laid-open publication No. hei 5-85683 (patent document 1) and japanese utility model laid-open publication No. hei 5-93884 (patent document 2), the O-ring can be deformed in the radial direction, and therefore the effect of preventing rattling is insufficient. Further, the writing section may bite into the surface of the O-ring, and the fed writing section may not be smoothly stored.
On the other hand, in the technique disclosed in japanese patent application laid-open publication No. 2013-220602 (patent document 3), in order to improve the effect of preventing rattling during writing, it is necessary to appropriately manage the dimensional relationship between the inner surface of the annular member and the outer peripheral surface of the writing portion. For example, if the dimension of the gap between the outer peripheral surface of the writing section and the inner surface of the annular member is larger than the dimension of the gap between the outer peripheral surface of the writing section and the inner surface of the distal end portion of the shaft tube, the effect of preventing rattling during writing cannot be obtained. Therefore, high dimensional accuracy is required, and there is a problem in terms of production efficiency.
The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a retractable writing instrument and a multi-core writing instrument which prevent a pen tip from shaking during writing to obtain a stable writing feeling and do not require high-precision component size management.
[ solution for solving problems ]
The invention of claim 1 is a retractable writing instrument characterized by comprising a shaft tube, a nib holder, a nib, an annular member, and an elastic member, wherein the shaft tube has an opening at a front end; the nib holder is accommodated in the shaft cylinder and is capable of moving in the axial direction of the shaft cylinder; the pen tip is fixed to a front end of the pen tip holder and is capable of extending and contracting from the opening of the shaft tube in accordance with movement of the pen tip holder; the annular member is loosely fitted to an outer periphery of the nib holder or the nib and is movable in an axial direction of the nib holder or the nib relative to the nib holder or the nib; the elastic member connects the tip holder and the annular member to each other so as to be movable relative to each other, and a contact surface that comes into contact with a part of the inner surface of the barrel in accordance with the movement of the tip holder toward the distal end side is formed on at least a part of the outer periphery of the annular member, a notch is formed on a part of the annular member, the inner diameter of the annular member is reduced when a load is received on the contact surface, a guide surface that comes into contact with the contact surface in accordance with the movement of the tip holder toward the distal end side is formed on a part of the inner surface of the barrel, and the contact surface receives the load from the guide surface in accordance with the movement of the tip holder toward the distal end side.
According to the invention of claim 1, since the contact surface of the annular member receives the load from the guide surface of the cylinder as the pen tip holder moves toward the distal end side, the inner diameter of the annular member is reduced by the presence of the notch of the annular member. Accordingly, the shaft tube and the annular member cooperate with each other to hold the pen tip or the pen tip holder without play (gap). Further, the pen tip holder and the annular member are connected to each other by the elastic member so as to be movable relative to each other, and therefore, even if the dimension control is not performed with high accuracy such as the degree of reduction of the inner diameter of the annular member, it is possible to ensure that the pen tip or the pen tip holder is held effectively without play (gap).
Preferably, the plurality of notches are arranged at equal intervals in a circumferential direction of the annular member, and each of the plurality of notches is a slit extending in an axial direction of the annular member. In this case, the inner diameter of the annular member can be reduced with good balance in the circumferential direction.
Preferably, the contact surface is tapered toward the front end, and the guide surface is also tapered toward the front end. Preferably, the abutment surface has, for example, a frustoconical surface. In this case, preferably, the guide surface is a corresponding concave frustoconical surface. Alternatively, preferably, the abutment surface has a convex curved surface rotationally symmetric about the axis. In this case, it is preferable that the guide surface is a concave curved surface or a concave truncated conical surface which is rotationally symmetric about the axis and has a gentler curvature than that of the convex curved surface.
Preferably, the elastic member is a coil spring. Alternatively, it is preferable that the elastic member is a cylindrical resin spring member formed with a plurality of slits extending in a direction perpendicular to the axial direction. In the latter case, the annular member and the resin spring member may be integrally molded from the same resin material.
Preferably, the elastic member and the pen tip holder may be connected by an annular collar. In this case, preferably, the elastic member and the annular collar are fixed to each other, and the annular collar and the shaft tube are fixed to each other by a 2 nd elastic member. Accordingly, it is not necessary to fix the pen tip holder and the annular collar, and therefore, the conventional refill having the pen tip holder of the related art can be used. In this configuration, the displacement amount of the 2 nd elastic member accompanying the movement of the pen tip holder is larger than the displacement amount of the elastic member accompanying the movement of the pen tip holder.
The invention of claim 1 may be applied to only the shaft tube of the above-described retractable writing instrument. That is, the present invention is a shaft barrel for a retractable writing instrument, which accommodates a pen tip holder having a pen tip fixed to a distal end thereof so as to be movable in an axial direction, the shaft barrel having an opening at the distal end thereof, the pen tip being retractable from the opening in accordance with movement of the pen tip holder, the shaft barrel comprising an annular member, an annular collar, and a 2 nd elastic member, wherein the annular member is configured to be loosely fitted to an outer periphery of the pen tip holder or the pen tip in a state where the pen tip holder is accommodated, and to be movable in the axial direction of the pen tip holder or the pen tip with respect to the pen tip holder or the pen tip when the annular member is loosely fitted; the annular collar is connected to the annular member via an elastic member and is capable of abutting against the pen tip holder in accordance with relative movement of the pen tip holder toward the tip end side; the second elastic member supports the annular collar on the inner surface of the barrel, and a contact surface that is tapered toward the tip is formed on at least a part of the outer periphery of the annular member, a notch is formed on a part of the annular member, the inner diameter of the annular member is reduced when a load is applied to the contact surface, a guide surface that is tapered toward the tip is formed on a part of the inner surface of the barrel, and the contact surface receives the load from the guide surface as the tip holder moves toward the tip.
The invention of claim 2 is a multi-refill writing instrument characterized by comprising a barrel, a plurality of nib holders, a nib, an annular member, and an elastic member, wherein the barrel has an opening at the front end; the plurality of nib holders are housed inside the shaft tube and are movable in the axial direction of the shaft tube; the pen tips are fixed to the tip ends of the pen tip holders and are extendable from the openings of the shaft tube in accordance with the movement of the pen tip holders; the annular member is loosely fitted to the outer periphery of each pen tip or each pen tip holder fixed to each pen tip, and is movable relative to the pen tip in the axial direction of the pen tip; the elastic member connects the tip holder and the annular member to each other so as to be movable relative to each other, and a contact surface that comes into contact with a part of the inner surface of the barrel in accordance with movement of the tip holder connected to the annular member is formed on at least a part of the outer periphery of the annular member, a notch is formed on a part of the annular member, the inner diameter of the annular member is reduced when a load is received on the contact surface, a guide surface that comes into contact with the contact surface in accordance with movement of the tip holder toward the tip side is formed on a part of the inner surface of the barrel, and the contact surface receives the load from the guide surface in accordance with movement of the tip holder connected to the annular member having the contact surface toward the tip side.
According to the invention of claim 2, since the contact portion of the annular member receives the load from the guide surface of the cylinder as the pen tip holder moves toward the distal end side, the inner diameter of the annular member is reduced by the presence of the notch of the annular member. Accordingly, the shaft tube and the annular member cooperate with each other to hold the pen tip or the pen tip holder without play (gap). Further, the pen tip holder and the annular member are connected to each other by the elastic member so as to be movable relative to each other, and therefore, even if the dimension control is not performed with high accuracy such as the degree of reduction of the inner diameter of the annular member, it is possible to ensure that the pen tip or the pen tip holder is held effectively without play (gap).
Preferably, the plurality of notches are arranged at equal intervals in a circumferential direction of the annular member, and each of the plurality of notches is a slit extending in an axial direction of the annular member. In this case, the inner diameter of the annular member can be reduced with good balance in the circumferential direction.
Preferably, the contact surface is tapered toward the front end, and the guide surface is also tapered toward the front end. Preferably, the abutment surface has, for example, a frustoconical surface. In this case, preferably, the guide surface is a corresponding concave frustoconical surface. Alternatively, preferably, the abutment surface has a convex curved surface rotationally symmetric about the axis. In this case, it is preferable that the guide surface is a concave curved surface or a concave truncated conical surface which is rotationally symmetric about the axis and has a gentler curvature than that of the convex curved surface.
Preferably, the elastic member is a cylindrical resin spring member having a plurality of slits extending in a direction perpendicular to the axial direction. In this case, it is further preferable that the ring member and the resin spring member are integrally molded from the same resin material.
Preferably, one of the plurality of pen tip holders holds a friction member as a pen tip. The friction member is an eraser or a rubber (eraser) for generating frictional heat for a thermochromic writing instrument. In this case, the friction member can be prevented from shaking at the time of handwriting erasing, so that a more stable handwriting erasing feeling can be obtained.
Preferably, the pen tip holder includes an operating body having an operating portion provided on a rear end side thereof, the shaft tube has a side wall on which a plurality of window holes extending therethrough in a radial direction are distributed, the window holes extending in a front-rear direction, the operating portion of each operating body protrudes radially outward from the corresponding window hole, the shaft tube has an engaging wall portion provided therein, the engaging wall portion is capable of engaging a part of the operating body corresponding to the operating portion when one of the operating portions slides forward, the shaft tube has a plurality of coil springs provided therein, the coil springs respectively urge the pen tip holders rearward, the coil springs are supported at front ends thereof by a spring support fixed to the shaft tube, and the spring support has a plurality of inner holes through which the pen tip holders are respectively inserted.
The invention of claim 3 is a multi-refill writing instrument comprising a barrel having an opening at the front end, a plurality of nib holders, a nib, an annular member, an annular collar, and a 2 nd elastic member; the plurality of nib holders are housed inside the shaft tube and are movable in the axial direction of the shaft tube; the pen tips are fixed to the tip ends of the pen tip holders and are extendable from the openings of the shaft tube in accordance with the movement of the pen tip holders; the annular member is configured to be loosely fitted to one of the plurality of tip holders or an outer periphery of a tip fixed to the one tip holder in accordance with movement of the tip holder toward a tip end side, and to be movable in an axial direction of the one tip holder or the tip with respect to the one tip holder or the tip when loosely fitted; the annular collar is connected to the annular member via an elastic member and is capable of abutting against the one pen tip holder in accordance with movement of the one pen tip holder toward the tip end side; the second elastic member supports the annular collar on the inner surface of the barrel, and has an abutting surface formed on at least a part of an outer periphery of the annular member, the abutting surface abutting against a part of the inner surface of the barrel when the annular collar and the elastic member move the tip side of the annular member in accordance with the movement of the tip holder, the annular member having a notch formed on a part of the annular member, the inner diameter of the annular member being reduced when a load is applied to the abutting surface, the annular collar and the elastic member moving the tip side of the tip holder in accordance with the movement of the tip holder, the abutment surface receives the load from the guide surface.
According to the invention of claim 3, the annular member is moved toward the tip end side by the annular collar and the elastic member as the pen tip holder moves toward the tip end side, and the contact portion of the annular member receives a load from the guide surface of the barrel. Accordingly, the shaft tube and the annular member cooperate with each other to hold the pen tip or the pen tip holder without play (gap). Further, the annular collar and the annular member that are in contact with the pen tip holder are connected by the elastic member, and therefore, even if the dimension control is not performed with high accuracy such as the degree of reduction of the inner diameter of the annular member, it is possible to ensure that the pen tip or the pen tip holder is held effectively without play (gap).
Preferably, the plurality of notches are arranged at equal intervals in a circumferential direction of the annular member, and each of the plurality of notches is a slit extending in an axial direction of the annular member. In this case, the inner diameter of the annular member can be reduced with good balance in the circumferential direction.
Preferably, the contact surface is tapered toward the front end, and the guide surface is also tapered toward the front end. Preferably, the abutment surface has, for example, a frustoconical surface. In this case, preferably, the guide surface is a corresponding concave frustoconical surface. Alternatively, preferably, the abutment surface has a convex curved surface rotationally symmetric about the axis. In this case, it is preferable that the guide surface is a concave curved surface or a concave truncated conical surface which is rotationally symmetric about the axis and has a gentler curvature than that of the convex curved surface.
Preferably, the elastic member is a cylindrical resin spring member having a plurality of slits extending in a direction perpendicular to the axial direction. In this case, it is further preferable that the annular member, the resin spring member, and the annular collar are integrally molded from the same resin material.
Preferably, one of the plurality of pen tip holders holds a friction member as a pen tip. The friction member is an eraser or a rubber (eraser) for generating frictional heat for a thermochromic writing instrument. In this case, the friction member can be prevented from shaking at the time of handwriting erasing, so that a more stable handwriting erasing feeling can be obtained.
The 3 rd invention may be applied to only the barrel of the multi-core writing instrument. That is, the present invention is a shaft barrel for a multi-core writing instrument, which accommodates a plurality of pen tip holders having pen tips fixed to the tips thereof so as to be movable in the axial direction, the shaft has an opening at a front end thereof, and a pen tip fixed to one of the plurality of pen tip holders is capable of extending and contracting from the opening in accordance with movement of the one pen tip holder, the shaft being characterized by comprising an annular member, an annular collar, and a 2 nd elastic member, wherein the annular member is configured to be loosely fitted to the one pen tip holder or an outer periphery of a pen tip fixed to the one pen tip holder in accordance with movement of the one pen tip holder toward a tip end side, the pen tip holder or the pen tip can move in the axial direction of the pen tip holder or the pen tip relative to the pen tip holder or the pen tip when the pen tip holder or the pen tip is loosely fitted; the annular collar is connected to the annular member via an elastic member and is capable of abutting against the one pen tip holder in accordance with movement of the one pen tip holder toward the tip end side; the second elastic member supports the annular collar on the inner surface of the barrel, and has an abutting surface formed on at least a part of an outer periphery of the annular member, the abutting surface abutting against a part of the inner surface of the barrel when the annular collar and the elastic member move the tip side of the annular member in accordance with the movement of the tip holder, the annular member having a notch formed on a part of the annular member, the inner diameter of the annular member being reduced when a load is applied to the abutting surface, the annular collar and the elastic member moving the tip side of the tip holder in accordance with the movement of the tip holder, the abutment surface receives the load from the guide surface.
[ Effect of the invention ]
According to the invention of claim 1, since the contact surface of the annular member receives the load from the guide surface of the cylinder as the pen tip holder moves toward the distal end side, the inner diameter of the annular member is reduced by the presence of the notch of the annular member. Accordingly, the shaft tube and the annular member cooperate with each other to hold the pen tip or the pen tip holder without play (gap). Further, the pen tip holder and the annular member are connected to each other by the elastic member so as to be movable relative to each other, and therefore, even if the dimension control is not performed with high accuracy such as the degree of reduction of the inner diameter of the annular member, it is possible to ensure that the pen tip or the pen tip holder is held effectively without play (gap).
According to the invention of claim 2, since the contact portion of the annular member receives the load from the guide surface of the cylinder as the pen tip holder moves toward the distal end side, the inner diameter of the annular member is reduced by the presence of the notch of the annular member. Accordingly, the shaft tube and the annular member cooperate with each other to hold the pen tip or the pen tip holder without play (gap). Further, the pen tip holder and the annular member are connected to each other by the elastic member so as to be movable relative to each other, and therefore, even if the dimension control is not performed with high accuracy such as the degree of reduction of the inner diameter of the annular member, it is possible to ensure that the pen tip or the pen tip holder is held effectively without play (gap).
According to the invention of claim 3, the annular member is moved toward the tip end side by the annular collar and the elastic member as the pen tip holder moves toward the tip end side, and the contact portion of the annular member receives a load from the guide surface of the barrel. Accordingly, the shaft tube and the annular member cooperate with each other to hold the pen tip or the pen tip holder without play (gap). Further, the annular collar and the annular member that are in contact with the pen tip holder are connected by the elastic member, and therefore, even if the dimension control is not performed with high accuracy such as the degree of reduction of the inner diameter of the annular member, it is possible to ensure that the pen tip or the pen tip holder is held effectively without play (gap).
Drawings
Fig. 1 is a schematic longitudinal cross-sectional view of a retractable writing instrument according to embodiment 1 of claim 1, showing a state in which a pen tip (writing body) is not projected.
Fig. 2A is an enlarged longitudinal sectional view of a tip portion of the retractable writing instrument of fig. 1.
Fig. 2B is a sectional view a-a of fig. 2A.
Fig. 3A is an enlarged longitudinal cross-sectional view of the tip portion of the retractable writing instrument of fig. 1 with the pen tip (writing body) protruding.
Fig. 3B is a cross-sectional view B-B of fig. 3A.
Fig. 4A is a perspective view of a ring-shaped member of the retractable writing instrument of fig. 1.
Fig. 4B is a side view of the ring member of fig. 4A.
Fig. 4C is a cross-sectional view C-C of fig. 4B.
Fig. 4D is a front view (a view viewed from the distal end side) of the ring member of fig. 4A.
Fig. 4E is a rear view of the ring member of fig. 4A.
Fig. 5 is a schematic view showing a state in which the pen tip holder is pulled out for replacement or the like in the retractable writing instrument of fig. 1.
Fig. 6 is a schematic longitudinal cross-sectional view of the retractable writing instrument according to embodiment 2 of the present invention 1, and shows a state in which a pen tip (writing body) is not projected.
Fig. 7 is an enlarged longitudinal sectional view of a tip portion of the retractable writing instrument of fig. 6.
Fig. 8 is an enlarged longitudinal cross-sectional view of the tip portion of the retractable writing instrument of fig. 6 with the pen tip (writing body) protruding.
Fig. 9A is a perspective view of a ring-shaped member of the retractable writing instrument of fig. 6.
Fig. 9B is a side view of the ring member of fig. 9A.
Fig. 9C is a cross-sectional view C-C of fig. 9B.
Fig. 9D is a front view (a view from the distal end side) of the ring member of fig. 9A.
Fig. 9E is a rear view of the ring member of fig. 9A.
Fig. 9F is a sectional view F-F of fig. 9B.
Fig. 9G is a sectional view G-G of fig. 9B.
Fig. 9H is an enlarged view of the H portion of fig. 9C.
Fig. 10 is a schematic view showing a state in which the pen tip holder is pulled out for replacement or the like in the retractable writing instrument of fig. 6.
Fig. 11 is a schematic longitudinal cross-sectional view of the retractable writing instrument according to embodiment 3 of the present invention 1, showing a state in which a pen tip (writing body) is not projected.
Fig. 12 is an enlarged longitudinal sectional view of a tip portion of the retractable writing instrument of fig. 11.
Fig. 13 is an enlarged longitudinal cross-sectional view of the tip portion of the retractable writing instrument of fig. 11 with the pen tip (writing body) protruding.
Fig. 14A is a perspective view of a ring member, a coil spring, and a collar member of the retractable writing instrument of fig. 11.
Fig. 14B is a side view of the ring member, coil spring and collar member of fig. 14A.
Fig. 14C is a front view (view from the tip end side) of the ring member, the coil spring, and the collar member of fig. 14A.
Fig. 14D is a rear view of the ring member, coil spring and collar member of fig. 14A.
Fig. 15 is a schematic view showing a state in which the pen tip holder is pulled out for replacement or the like in the retractable writing instrument of fig. 11.
Fig. 16 is a schematic longitudinal cross-sectional view of the retractable writing instrument according to embodiment 4 of the present invention 1, showing a state in which a pen tip (writing body) is not projected.
Fig. 17 is an enlarged longitudinal sectional view of a tip portion of the retractable writing instrument of fig. 16.
Fig. 18 is an enlarged longitudinal cross-sectional view of the tip portion of the retractable writing instrument of fig. 16 with the pen tip (writing body) protruding.
Fig. 19A is a perspective view of a ring-shaped member of the retractable writing instrument of fig. 16.
Fig. 19B is a side view of the ring member of fig. 19A.
Fig. 19C is a cross-sectional view C-C of fig. 19B.
Fig. 19D is a front view (view from the distal end side) of the ring member of fig. 19A.
Fig. 19E is a rear view of the ring member of fig. 19A.
Fig. 19F is an enlarged view of the portion F of fig. 19C.
Fig. 20 is a schematic view showing a state in which the pen tip holder is pulled out for replacement or the like in the retractable writing instrument of fig. 16.
Fig. 21 is a schematic longitudinal cross-sectional view of the multi-core writing instrument according to the embodiment of the present invention, and is a view showing a state in which all pen tips (writing bodies) are not projected.
FIG. 22 is an enlarged longitudinal cross-sectional view of the tip section of the multi-core writing instrument of FIG. 21.
Fig. 23 is a sectional view B-B of fig. 22.
Fig. 24A is a side view of the nib, nib holder, annular member, and elastic member of the multi-nib writing instrument of fig. 21.
Fig. 24B is a sectional view a-a of fig. 24A.
Fig. 25A is a perspective view of the pen tip holder, the annular member, and the elastic member of the multi-core writing instrument of fig. 21.
Fig. 25B is a longitudinal sectional view of the pen tip holder, the annular member, and the elastic member of fig. 25A.
Fig. 26 is a schematic longitudinal cross-sectional view of the multi-core writing instrument of fig. 21, showing a state in which one pen tip (writing body) protrudes.
FIG. 27 is an enlarged longitudinal cross-sectional view of the tip section of the multi-core writing instrument of FIG. 26.
Fig. 28 is a cross-sectional view C-C of fig. 27.
Fig. 29 is a schematic longitudinal cross-sectional view of the multi-core writing instrument according to the embodiment of the present invention, and is a view showing a state in which all pen tips (writing bodies) are not projected.
FIG. 30 is an enlarged longitudinal cross-sectional view of the tip section of the multi-core writing instrument of FIG. 29.
Fig. 31 is a sectional view a-a of fig. 30.
FIG. 32A is a perspective view of the ring member, elastic member, and collar member of the multi-core writing instrument of FIG. 29.
Fig. 32B is a side view of the ring member, elastic member, and collar member of fig. 32A.
Fig. 32C is a cross-sectional view C-C of fig. 32B.
Fig. 32D is a front view (viewed from the distal end side) of the ring member, elastic member, and collar member of fig. 32A.
Fig. 32E is a rear view of the ring member, elastic member and collar member of fig. 32A.
Fig. 33 is a schematic longitudinal cross-sectional view of the multi-core writing instrument of fig. 29, showing a state in which one pen tip (writing body) protrudes.
FIG. 34 is an enlarged longitudinal cross-sectional view of the tip section of the multi-core writing instrument of FIG. 33.
Fig. 35 is a sectional view B-B of fig. 34.
Detailed Description
Next, 4 embodiments of the 1 st invention, 1 embodiment of the 2 nd invention, and 1 embodiment of the 3 rd invention will be described with reference to the drawings.
< embodiment 1 of the invention 1 >
Fig. 1 is a schematic longitudinal cross-sectional view of a retractable writing instrument 10 according to embodiment 1 of the present invention, and is a view showing a state in which a pen tip 14 (writing body) is not projected. Fig. 2A is an enlarged longitudinal sectional view of the tip portion of the retractable writing instrument 10 according to the present embodiment, and fig. 2B is a sectional view taken along line a-a of fig. 2A. Fig. 3A is an enlarged longitudinal sectional view of the tip portion of the retractable writing instrument 10 according to the present embodiment in a state where the pen tip 14 (writing body) is projected, and fig. 3B is a sectional view B-B of fig. 3A.
Fig. 4A is a perspective view of the ring member 15 of the retractable writing instrument 10 according to the present embodiment, fig. 4B is a side view of the ring member 15, fig. 4C is a cross-sectional view taken along line C-C of fig. 4B, fig. 4D is a front view (a view viewed from the distal end side) of the ring member 15, and fig. 4E is a rear view of the ring member 15.
Fig. 5 is a schematic view showing a state in which the pen tip holder 13 is removed for replacement or the like in the retractable writing instrument 10 according to the present embodiment.
A retractable writing instrument 10 according to embodiment 1 shown in fig. 1 to 5 has a cylindrical shaft tube 11 having an opening at its front end. As shown in fig. 1 to 3, in the present embodiment, the shaft tube 11 includes a rear portion 11a, an inner tube portion 11b, a front portion 11c, and a tube head portion 11d, the rear portion 11a and the inner tube portion 11b are detachably fixed by screw coupling (screwing), and the inner tube portion 11b and the front portion 11c are formed integrally by two-color molding. However, the rear portion 11a and the inner cylindrical portion 11b may be fixed by fitting and joining, or may be formed integrally. The inner tube portion 11b and the front portion 11c may be fixed by fitting and coupling. On the other hand, the pipe head 11d is detachably fixed to the inner tube portion 11b by screwing (screwing). The material of the pipe head 11d is not limited to metal, and may be resin.
A pen tip holder 13 is accommodated in the shaft tube 11 so as to be movable in the axial direction of the shaft tube 11. A pen tip 14 as a writing implement is fixed to the tip end of the pen tip holder 13. As shown in fig. 2A and 3A, the pen tip 14 is extendable from the opening of the barrel 11 in accordance with the movement of the pen tip holder 13.
As shown in fig. 5, the pen tip holder 13 includes a base end portion 13a, a 1 st collar portion 13b, a 2 nd collar portion 13c, a spring fixing auxiliary portion 13f, and a tip end portion 13d in this order from the base end side toward the tip end side. In the present embodiment, the base end portion 13a, the 1 st collar portion 13b, the 2 nd collar portion 13c, the spring fixing auxiliary portion 13f, and the tip end portion 13d are all cylindrical portions, and their cross-sectional diameters have a mutual relationship: the base end portion 13a > the 1 st collar portion 13b > the 2 nd collar portion 13c > the spring fixing auxiliary portion 13f > the tip end portion 13 d.
In the present embodiment, as shown in fig. 2B in particular, a resin (e.g., polyacetal) or metal (e.g., brass) annular member 15 is loosely fitted to the outer periphery of the tip end portion 13d of the pen tip holder 13. The annular member 15 is fixed to the 2 nd collar portion 13c of the pen tip holder 13 by a coil spring 16 (an example of an elastic member), and the coil spring 16 also surrounds the outer periphery of the tip end portion 13d of the pen tip holder 13 in a loosely fitted state (with a slight gap left). Accordingly, as shown in fig. 2A and 3A, the annular member 15 is movable in the axial direction of the pen tip holder 13 with respect to the distal end portion 13d of the pen tip holder 13 in accordance with the expansion and contraction deformation of the coil spring 16.
The pen tip holder 13 of the present embodiment is provided with a spring fixing assisting unit 13f for assisting the fixing of the coil spring 16 and the 2 nd collar unit 13 c.
As shown in fig. 4A to 4E in particular, a truncated conical surface-shaped abutment surface 15t is formed as an abutment surface tapered toward the front end in a front region of the outer periphery of the annular member 15. A large-outer-diameter cylindrical portion 15a is continuously provided on the rear side of the contact surface 15t, and a small-outer-diameter cylindrical portion 15b is provided on the rear side thereof via a step.
The annular member 15 of the present embodiment is provided with 4 slits 15s as notches. As shown in fig. 4A to 4E, the 4 slits 15s are arranged at equal intervals (every 90 °) in the circumferential direction of the annular member 15. The 4 slits 15s each extend from the tip to substantially the center of the small-diameter cylindrical portion 15b in the axial direction of the annular member 15. Accordingly, when a load is applied to the contact surface 15t, the inner diameter of the annular member 15 flexibly decreases, and when the load is released, the inner diameter of the annular member 15 elastically returns.
As shown in fig. 2A and 3A, a guide surface 11t having a concave truncated conical surface shape is formed as a tapered guide surface toward the front end on a part of the inner surface of the tube head portion 11d of the shaft tube 11. Accordingly, the contact surface 15t receives a load from the guide surface 11t as the pen tip holder 13 moves toward the distal end side (fig. 2A → fig. 3A).
The retractable writing instrument 10 according to the present embodiment is provided with a 2 nd coil spring 12 (a 2 nd elastic member), and the 2 nd coil spring 12 is configured to automatically retract the pen tip holder 13 when a retraction operation of the pen tip 14 (for example, a pressing operation of a pressing button provided at a rear end portion of the writing instrument for releasing a lock mechanism for maintaining a protruding state of the pen tip 14) is performed. The 2 nd coil spring 12 is inserted between a shoulder portion provided on the inner surface of the barrel head portion 11d and the 1 st collar portion 13b of the pen tip holder 13 so as to surround a portion closer to the outer periphery of the coil spring 16.
The 2 nd coil spring 12 may be fixed to the inner surface of the pipe head 11d, or may be in a free state (a state of not being fixed to any member). Or may be fixed to the 1 st collar portion 13b of the pen tip holder 13.
The retractable writing instrument 10 configured as described above functions as follows.
When not in use, the nib 14 (writing body) of the retractable writing instrument 10 is in a retracted state as shown in fig. 2A. The axial length of the coil spring 16 is 8.2mm, and the axial length of the 2 nd coil spring 12 is 16.4 mm. When the pen tip is then protruded (for example, when a push button provided at the rear end of the writing instrument is pushed), the pen tip 14 (writing body) of the retractable writing instrument 10 is in a protruded state as shown in fig. 3A. Normally, the position of the pen tip holder 13 is locked in this projected state, and thereafter, the projected state of the pen tip 14 is maintained until the retracting operation of the pen tip is performed. The axial length of the coil spring 16 is 5.6mm (compression 2.6mm) and the axial length of the 2 nd coil spring 12 is 9.4mm (compression 7.0 mm).
In the process from the retracted state of fig. 2A to the projected state of fig. 3A, the abutment surface 15t of the annular member 15 receives a load from the guide surface 11t of the tube head 11d as the pen tip holder 13 moves toward the distal end side. At this time, the inner diameter of the annular member 15 is reduced by the presence of the 4 slits 15s of the annular member 15 (fig. 2B → fig. 3B). As a result, as shown in fig. 3B, the tube head 11d and the ring member 15 cooperate to grip the tip end portion 13d of the pen tip holder 13 without play (gap).
Further, the tip end portion 13d of the tip holder 13 can be held effectively without play (gap) by connecting the tip holder 13 and the annular member 15 to each other by the coil spring 16 so as to be movable relative to each other, without performing highly accurate dimensional control such as the degree of reduction of the inner diameter of the annular member 15.
After that, when the pen tip is retracted (for example, a push button provided at the rear end of the writing instrument is pushed again), for example, a lock mechanism (not shown) is unlocked, and the pen tip 14 (writing body) of the retractable writing instrument 10 is returned to the retracted state shown in fig. 2A by the action of the 2 nd coil spring 12.
In the process from the projected state of fig. 3A to the retracted state of fig. 2A, the load from the guide surface 11t of the tube head 11d received by the abutment surface 15t of the annular member 15 disappears as the pen tip holder 13 moves to the rear end side. Along with this, the inner diameter of the annular member 15 having the reduced diameter is restored to the original state (fig. 3B → fig. 2B).
As described above, according to the retractable writing instrument 10 of the present embodiment, the contact surface 15t of the annular member 15 receives the load from the guide surface 11t of the tube head 11d as the pen tip holder 13 moves toward the distal end side, and therefore the inner diameter of the annular member 15 is reduced by the presence of the slit 15s of the annular member 15. Accordingly, the tube head 11d cooperates with the annular member 15 to grip the tip end portion 13d of the pen tip holder 13 without play (gap). Further, the tip end portion 13d of the tip holder 13 can be held effectively without play (gap) even without performing highly precise dimensional control such as the degree of reduction of the inner diameter of the annular member 15 by connecting the tip holder 13 and the annular member 15 to each other so as to be movable relative to each other by the coil spring 16.
In addition, according to the retractable writing instrument 10 of the present embodiment, since the 4 slits 15s as the notches are arranged at equal intervals in the circumferential direction of the annular member 15 and the respective slits 15s extend in the axial direction of the annular member 15, the inner diameter of the annular member 15 can be reduced in the circumferential direction with good balance.
Further, since the abutment surface 15t and the guide surface 11t are formed into a truncated conical surface shape and a concave truncated conical surface shape corresponding to each other, the abutment surface 15t of the annular member 15 can receive a load with good balance in the circumferential direction, and as a result, the annular member 15 can be reduced in diameter with good balance in the circumferential direction. In this manner, the abutment surface 15t and the guide surface 11t are preferably tapered as they approach the front end. The tapered contact surface 15t may be formed by providing a round corner (R) on the outer periphery of the distal end of the cylindrical annular member 15. The tapered contact surface 15t may have a convex curved surface rotationally symmetric about the axis, and the tapered guide surface 11t may be a concave curved surface or a concave truncated conical surface rotationally symmetric about the axis and having a curvature gentler than that of the convex curved surface.
In the telescopic writing instrument 10 of the present embodiment, the annular member 15 is movable in the axial direction in the region of the distal end portion 13d of the pen tip holder 13, and is formed as a region for gripping the distal end portion 13d of the pen tip holder 13 when the annular member 15 is reduced in diameter. For example, the annular member 15 may be movable in the axial direction in the region of the pen tip 14, and may be formed as a region for gripping the pen tip 14 when the annular member 15 is reduced in diameter.
Further, by appropriately changing the number, size, shape, and the like of the slits 15s, the degree of elasticity (diameter-reducing easiness) of the annular member 15 can be adjusted. Further, the degree of elasticity (diameter-reducing property) of the annular member 15 can also be adjusted by changing the material and/or the thickness of the annular member 15.
< embodiment 2 of the invention 1 >
Fig. 6 is a schematic longitudinal cross-sectional view of the retractable writing instrument 20 according to embodiment 2 of the present invention 1, and is a view showing a state where the pen tip 24 (writing body) is not projected. Fig. 7 is an enlarged longitudinal sectional view of the tip portion of the retractable writing instrument 20 of the present embodiment. Fig. 8 is an enlarged longitudinal cross-sectional view of the tip end portion of the retractable writing instrument 20 according to the present embodiment in a state where the pen tip 24 (writing body) is projected.
Fig. 9A is a perspective view of the ring member 25 of the retractable writing instrument 20 according to the present embodiment, fig. 9B is a side view of the ring member 25, fig. 9C is a cross-sectional view taken along line C-C of fig. 9B, fig. 9D is a front view (a view viewed from the distal end side) of the ring member 25, and fig. 9E is a rear view of the ring member 25. Fig. 9F is a sectional view taken along line F-F of fig. 9B, fig. 9G is a sectional view taken along line G-G of fig. 9B, and fig. 9H is an enlarged view of portion H of fig. 9C.
Fig. 10 is a schematic view showing a state in which the pen tip holder 23 is pulled out for replacement or the like in the retractable writing instrument 20 of the present embodiment.
The retractable writing instrument 20 according to embodiment 2 shown in fig. 6 to 10 has a cylindrical shaft tube 11, and the shaft tube 11 has an opening at the tip, as in embodiment 1. As shown in fig. 6 to 8, the shaft tube 11 also includes a rear portion 11a, an inner tube portion 11b, a front portion 11c, and a tube head portion 11d in the present embodiment, the rear portion 11a and the inner tube portion 11b are detachably fixed by screw coupling (screwing), and the inner tube portion 11b and the front portion 11c are formed integrally by two-color molding. However, the rear portion 11a and the inner cylindrical portion 11b may be fixed by fitting and joining, or may be formed integrally. The inner tube portion 11b and the front portion 11c may be fixed by fitting and coupling. On the other hand, the pipe head 11d is detachably fixed to the inner tube portion 11b by screwing (screwing). The material of the pipe head 11d is not limited to metal, and may be resin.
A pen tip holder 23 is accommodated in the shaft tube 11 so as to be movable in the axial direction of the shaft tube 11. A pen tip 24 as a writing implement is fixed to the tip end of the pen tip holder 23. As shown in fig. 7 and 8, the pen tip 24 can be extended and contracted from the opening of the shaft 11 in accordance with the movement of the pen tip holder 23.
As shown in fig. 10, the pen tip holder 23 includes a base end portion 23a, a 1 st collar portion 23b, a 2 nd collar portion 23c, and a tip end portion 23d in this order from the base end side toward the tip end side. In the present embodiment, the base end portion 23a, the 1 st collar portion 23b, the 2 nd collar portion 23c, and the tip end portion 23d are all cylindrical portions, and the mutual relationship of the cross-sectional diameters thereof is: the base end portion 23a > the 1 st collar portion 23b > the 2 nd collar portion 23c > the tip end portion 23 d.
In the present embodiment, as shown in fig. 7 in particular, a resin (e.g., polyacetal) annular member 25 is loosely fitted to the outer periphery of the tip end portion 23d of the pen tip holder 23. The annular member 25 of the present embodiment is integrally molded with a cylindrical resin spring portion 26e at its proximal end side. The resin spring portion 26e is formed with a plurality of slits 26s extending in a direction perpendicular to the axial direction so that the resin spring portion 26e can expand and contract in the axial direction.
As shown in fig. 9A to 9H, in the resin spring portion 26e of the present embodiment, pairs of substantially semicircular slits 26s facing each other in the vertical direction (see fig. 9F) and pairs of substantially semicircular slits 26s facing each other in the left-right direction (see fig. 9G) are alternately formed in each pair in the axial direction, and 6 pairs of the pairs of substantially semicircular slits 26s facing each other in the vertical direction and the pairs of substantially semicircular slits 26s facing each other in the left-right direction are formed. The remaining portion of the paired slits 26s between each other is referred to as a remaining portion 26 b. In the present embodiment, the width (axial length) of each slit 26s is uniform, and the axial interval between the slits 26s adjacent in the axial direction is also uniform, and the former is slightly smaller than the latter. However, these dimensional relationships may be appropriately adjusted as described later to achieve the desired degree of elasticity.
The resin spring portion 26e is fixed to the 2 nd collar portion 23c of the pen tip holder 23 at a portion closer to the base end side. Accordingly, as shown in fig. 7 and 8, the annular member 25 is movable in the axial direction of the pen tip holder 23 with respect to the distal end portion 23d of the pen tip holder 23 in accordance with the expansion and contraction deformation of the resin spring portion 26 e.
As shown in fig. 9A to 9E in particular, a contact surface 25t in the form of a truncated cone is formed in a front region of the outer periphery of the annular member 25, and this contact surface 25t is a contact surface that tapers toward the front end. A cylindrical portion 25a is continuously provided on the rear side of the contact surface 25t, and a cylindrical resin spring portion 26e having the same diameter as the cylindrical portion 25a is provided on the rear side of the cylindrical portion 25 a. As shown in fig. 9H in particular, the inner diameter 26r of the resin spring portion 26e is larger than the inner diameter 25r of the portion corresponding to the contact surface 25 t.
The annular member 25 of the present embodiment is provided with 4 slits 25s as notches. As shown in fig. 9A to 9E, the 4 slits 25s are arranged at equal intervals (every 90 °) in the circumferential direction of the annular member 25. Further, the 4 slits 25s each extend from the front end to the vicinity of the rear end of the cylindrical portion 25a in the axial direction of the annular member 25. Accordingly, when a load is applied to the contact surface 25t, the inner diameter of the annular member 25 flexibly decreases, and when the load is released, the inner diameter of the annular member 25 elastically returns.
As shown in fig. 7 and 8, a guide surface 11t having a concave truncated conical surface shape is formed as a tapered guide surface toward the front end on a part of the inner surface of the tube head portion 11d of the shaft tube 11. Accordingly, the contact surface 25t receives a load from the guide surface 11t as it moves toward the tip end side of the pen tip holder 23 (fig. 7 → fig. 8).
The retractable writing instrument 20 according to the present embodiment is also provided with a 2 nd coil spring 12 (a 2 nd elastic member), and the 2 nd coil spring 12 is configured to automatically retract the pen tip holder 23 when a retraction operation of the pen tip 24 is performed (for example, a pressing operation of a pressing button provided at a rear end portion of the writing instrument for releasing a lock mechanism for maintaining the projecting state of the pen tip 24). The 2 nd coil spring 12 is inserted between a shoulder portion provided on the inner surface of the barrel head portion 11d and the 1 st collar portion 23b of the pen tip holder 23 so as to further surround a portion of the outer periphery of the annular member 25.
The 2 nd coil spring 12 may be fixed to the inner surface of the pipe head 11d, or may be in a free state (a state of not being fixed to any member). Or may be fixed to the 1 st collar portion 23b of the pen tip holder 23.
The retractable writing instrument 20 configured as described above functions as follows.
When not in use, the nib 24 (writing body) of the retractable writing instrument 20 is in a retracted state as shown in fig. 7. The annular member 25 including the resin spring portion 26e has an axial length of 9.2mm, and the 2 nd coil spring 12 has an axial length of 16.4 mm. When the pen tip is then protruded (for example, when a push button provided at the rear end of the writing instrument is pushed), the pen tip 24 (writing body) of the retractable writing instrument 20 is in a protruded state as shown in fig. 8. Normally, the position of the pen tip holder 23 is locked in this projected state, and thereafter, the projected state of the pen tip 24 is maintained until the retracting operation of the pen tip is performed. The annular member 25 including the resin spring portion 26e has an axial length of 8.5mm (compression of 0.7mm), and the 2 nd coil spring 12 has an axial length of 9.4mm (compression of 7.0 mm).
In the process from the retracted state of fig. 7 to the projected state of fig. 8, the abutment surface 25t of the annular member 25 receives a load from the guide surface 11t of the tube head 11d as the pen tip holder 23 moves toward the distal end side. At this time, the inner diameter of the annular member 25 is reduced by the presence of the 4 slits 25s of the annular member 25 (see fig. 3B). As a result, as shown in fig. 8, the tube head 11d and the ring member 25 cooperate to grip the tip end portion 23d of the pen tip holder 23 without play (gap).
Further, since the abutting surface 25t of the pen tip holder 23 and the annular member 25 can be moved relative to each other by the expansion and contraction action of the resin spring portion 26, even if highly accurate dimensional control such as the degree of reduction of the inner diameter of the annular member 25 is not performed, it is possible to ensure that the tip end portion 23d of the pen tip holder 23 is effectively gripped without play (gap).
After that, when the retracting operation of the pen tip (for example, the re-pressing operation of the push button provided at the rear end portion of the writing instrument) is performed, for example, a lock mechanism (not shown) is unlocked, and the pen tip 24 (writing body) of the retractable writing instrument 20 is returned to the retracted state shown in fig. 7 by the action of the 2 nd coil spring 12.
In the process from the projected state of fig. 8 to the retracted state of fig. 7, the load from the guide surface 11t of the tube head 11d received by the abutment surface 25t of the annular member 25 disappears as the pen tip holder 23 moves to the rear end side. With this, the inner diameter of the annular member 25 having the reduced diameter is returned to the original state (fig. 8 → fig. 7).
As described above, according to the retractable writing instrument 20 of the present embodiment, the abutting surface 25t of the annular member 25 receives the load from the guide surface 11t of the tube head 11d as the pen tip holder 23 moves toward the distal end side, and therefore the inner diameter of the annular member 25 is reduced by the presence of the slit 25s of the annular member 25. Accordingly, the tube head 11d and the annular member 25 cooperate to grip the tip end portion 23d of the pen tip holder 23 without play (gap). Further, the tip end portion 23d of the pen tip holder 23 can be held effectively without play (gap) even without performing highly precise dimensional control such as the degree of reduction of the inner diameter of the annular member 25 by connecting the abutting surfaces 25t of the pen tip holder 23 and the annular member 25 to be movable relative to each other by the resin spring portion 26 e.
Since the inner diameter 26r of the resin spring portion 26e is larger than the inner diameter 25r of the portion corresponding to the abutment surface 25t, the resin spring portion 26e does not come into contact with the pen tip holder 23 even when it contracts and expands toward the inner diameter side.
In addition, according to the retractable writing instrument 20 of the present embodiment, since the 4 slits 25s as the notches are arranged at equal intervals in the circumferential direction of the annular member 25 and the slits 25s extend in the axial direction of the annular member 25, the inner diameter of the annular member 25 can be reduced in the circumferential direction with good balance.
Further, since the abutment surface 25t and the guide surface 11t are formed into a truncated conical surface shape and a concave truncated conical surface shape corresponding to each other, the abutment surface 25t of the annular member 25 can receive a load with good balance in the circumferential direction, and as a result, the annular member 25 can be reduced in diameter with good balance in the circumferential direction. In this manner, the abutment surface 25t and the guide surface 11t are preferably tapered as they approach the front end. The tapered contact surface 25t may be formed by providing a rounded corner (R) on the outer periphery of the distal end of the cylindrical annular member 25. The tapered contact surface 25t may have a convex curved surface rotationally symmetric about the axis, and the tapered guide surface 11t may be a concave curved surface or a concave truncated conical surface rotationally symmetric about the axis and having a curvature gentler than that of the convex curved surface.
In the retractable writing instrument 20 of the present embodiment, the annular member 25 is movable in the axial direction in the region of the distal end portion 23d of the pen tip holder 23, and is formed as a region for gripping the distal end portion 23d of the pen tip holder 23 when the annular member 25 is reduced in diameter. For example, the annular member 25 may be movable in the axial direction in the region of the pen tip 24, and may be formed as a region for gripping the pen tip 24 when the annular member 25 is reduced in diameter.
Further, by appropriately changing the number, size, shape, and the like of the slits 25s, the degree of elasticity (diameter-reducing property) of the annular member 25 can be adjusted. Further, the degree of elasticity (diameter-reducing property) of the annular member 25 can also be adjusted by changing the material and/or the thickness of the annular member 25.
Further, by appropriately changing the number, size, shape, and the like of the slits 26s, the degree of elasticity (easy stretchability) of the resin spring portion 26e can be adjusted. The slit 26s preferably extends in a direction perpendicular to the axial direction, but may extend obliquely (for example, spirally) to the axial direction.
In addition, by changing the thickness of the resin spring portion 26e, the degree of elasticity (easy stretchability) of the resin spring portion 26e can also be adjusted. The resin spring portion 26e may be formed as a separate resin spring member from the contact surface 25t and the cylindrical portion 25a, or may be joined to the cylindrical portion 25 a. In this case, the degree of elasticity (diameter-reducing property) of the resin spring member can be adjusted by adjusting the material of the resin spring member.
The resin spring portion 26e (or a separate resin spring member) is not limited to the form having the slit 26s, and may have a bellows structure that expands and contracts in the axial direction.
< embodiment 3 of the invention 1 >
Fig. 11 is a schematic longitudinal cross-sectional view of the retractable writing instrument 30 according to embodiment 3 of the present invention 1, and shows a state in which the pen tip 34 (writing body) is not projected. Fig. 12 is an enlarged longitudinal sectional view of the tip portion of the retractable writing instrument 30 of the present embodiment. Fig. 13 is an enlarged longitudinal cross-sectional view of the tip end portion of the retractable writing instrument 30 according to the present embodiment in a state where the pen tip 34 (writing body) is projected.
Fig. 14A is a perspective view of the ring member 15, the coil spring 16, and the collar member 32 of the retractable writing instrument 30 according to the present embodiment, fig. 14B is a side view of the ring member 15, the coil spring 16, and the collar member 32, fig. 14C is a front view (a view from the distal end side) of the ring member 15, the coil spring 16, and the collar member 32, and fig. 14D is a rear view of the ring member 15, the coil spring 16, and the collar member 32.
Fig. 15 is a schematic view showing a state in which the pen tip holder 33 is removed for replacement or the like in the retractable writing instrument 30 of the present embodiment.
The retractable writing instrument 30 according to embodiment 3 shown in fig. 11 to 15 has a cylindrical shaft tube 11, and the shaft tube 11 has an opening at the tip, as in embodiments 1 and 2. As shown in fig. 11 to 13, this shaft tube 11 also has a rear portion 11a, an inner tube portion 11b, a front portion 11c, and a tube head portion 11d in the present embodiment, the rear portion 11a and the inner tube portion 11b are detachably fixed by screw coupling (screwing), and the inner tube portion 11b and the front portion 11c are formed integrally by two-color molding. However, the rear portion 11a and the inner cylindrical portion 11b may be fixed by fitting and joining, or may be formed integrally. The inner tube portion 11b and the front portion 11c may be fixed by fitting and coupling. On the other hand, the pipe head 11d is detachably fixed to the inner tube portion 11b by screwing (screwing). The material of the pipe head 11d is not limited to metal, and may be resin.
A pen tip holder 33 is accommodated in the shaft tube 11 so as to be movable in the axial direction of the shaft tube 11. A pen tip 34 as a writing implement is fixed to the tip end of the pen tip holder 33. As shown in fig. 12 and 13, the pen tip 34 is retractable from the opening of the barrel 11 in accordance with the movement of the pen tip holder 33.
As shown in fig. 15, the pen tip holder 33 includes a base end portion 33a, an intermediate collar portion 33m, and a tip end portion 33d in this order from the base end side toward the tip end side. In the present embodiment, the proximal end portion 33a, the intermediate collar portion 33m, and the distal end portion 33d are all cylindrical portions, and the mutual relationship of the cross-sectional diameters thereof is: the base end portion 33a > the intermediate collar portion 33m > the tip end portion 33 d.
In the present embodiment, as shown in fig. 12 in particular, the annular member 15 made of resin (e.g., polyacetal) or metal (e.g., brass) is loosely fitted to the outer periphery of the tip end portion 33d of the pen tip holder 33. As shown in fig. 14A and 14B, the annular member 15 is fixed to the 2 nd collar portion 33c of the collar member 32 by a coil spring 16 (an example of an elastic member), and the coil spring 16 surrounds the outer periphery of the tip end portion 33d of the pen tip holder 33 in a loosely fitted state (with a slight gap) in the same manner. As shown in fig. 12 and 13, the 1 st collar portion 33b of the collar member 32 is axially supported in contact with the intermediate collar portion 33m of the pen tip holder 33. Accordingly, the annular member 15 is movable in the axial direction of the pen tip holder 33 with respect to the tip end portion 33d of the pen tip holder 33 in accordance with the expansion and contraction deformation of the coil spring 16.
The collar member 32 of the present embodiment is provided with a spring fixing auxiliary portion 33f for assisting the fixing of the coil spring 16 and the 2 nd collar portion 33 c. That is, the collar member 32 includes a 1 st collar portion 33b, a 2 nd collar portion 33c, and a spring fixing auxiliary portion 33f in this order from the proximal end side toward the distal end side. In the present embodiment, the 1 st collar portion 33b, the 2 nd collar portion 33c, and the spring fixing auxiliary portion 33f are all cylindrical portions, and the mutual relationship of the cross-sectional diameters thereof is: the 1 st collar portion 33b > the 2 nd collar portion 33c > the spring fixing auxiliary portion 33 f.
The annular member 15 and the coil spring 16 of the present embodiment are the same as the annular member 15 and the coil spring 16 of embodiment 1, respectively. Therefore, the same reference numerals are used on the corresponding components.
That is, as shown in fig. 4A to 4E, a contact surface 15t having a truncated conical surface shape is formed in a front region of the outer periphery of the annular member 15, and as a contact surface tapered toward the front end, a large outer diameter cylindrical portion 15a is continuously provided on a rear side of the contact surface 15t, and a small outer diameter cylindrical portion 15b is provided on a rear side of the large outer diameter cylindrical portion 15a with a step therebetween.
Further, the annular member 15 is provided with 4 slits 15s as cutouts, and as shown in fig. 4A to 4E, the 4 slits 15s are arranged at equal intervals (every 90 °) in the circumferential direction of the annular member 15. The 4 slits 15s each extend from the tip to substantially the center of the small-diameter cylindrical portion 15b in the axial direction of the annular member 15, and when a load is applied to the contact surface 15t, the inner diameter of the annular member 15 flexibly decreases, and when the load is released, the inner diameter of the annular member 15 elastically returns.
On the other hand, as shown in fig. 12 and 13, a guide surface 11t having a concave truncated conical surface shape is formed as a tapered guide surface toward the front end on a part of the inner surface of the tube head portion 11d of the shaft tube 11. Accordingly, the contact surface 15t receives a load from the guide surface 11t as it moves toward the tip end side of the pen tip holder 33 (fig. 12 → fig. 13).
The retractable writing instrument 30 of the present embodiment is provided with a 2 nd coil spring 12 (a 2 nd elastic member), and the 2 nd coil spring 12 is configured to automatically retract the pen tip holder 33 when a retraction operation of the pen tip 34 is performed (for example, a pressing operation of a pressing button provided at a rear end portion of the writing instrument for releasing a lock mechanism for maintaining the projecting state of the pen tip 34). The 2 nd coil spring 12 is inserted between a shoulder portion provided on the inner surface of the pipe head portion 11d and the 1 st collar portion 33b of the collar member 32 so as to surround a portion closer to the outer periphery of the coil spring 16.
As shown in fig. 15, the 2 nd coil spring 12 of the present embodiment is fixed to the inner surface of the pipe head portion 11d on the distal end side and to the 1 st collar portion 33b of the collar member 32 on the rear end side. Accordingly, the ring member 15 and the coil spring 16 are supported and fixed to the inner surface of the pipe head portion 11d by the collar member 32 and the 2 nd coil spring 12.
The retractable writing instrument 30 configured as described above functions as follows.
When not in use, the nib 34 (writing body) of the retractable writing instrument 30 is in a retracted state as shown in fig. 12. The axial length of the coil spring 16 is 10.6mm, and the axial length of the 2 nd coil spring 12 is 15.9 mm. When the pen tip is then protruded (for example, a pressing operation of a pressing button provided at the rear end of the writing instrument), the pen tip 34 (writing body) of the retractable writing instrument 30 is in a protruded state as shown in fig. 13. Normally, the position of the pen tip holder 33 is locked in this projected state, and thereafter, the projected state of the pen tip 34 is maintained until the retracting operation of the pen tip is performed. The axial length of the coil spring 16 is 8.0mm (compression 2.6mm) and the axial length of the 2 nd coil spring 12 is 8.9mm (compression 7.0 mm).
In the process from the retracted state of fig. 12 to the projected state of fig. 13, the abutting surface 15t of the annular member 15 receives a load from the guide surface 11t of the tube head 11d as the pen tip holder 33 moves toward the distal end side. At this time, the inner diameter of the annular member 15 is reduced by the presence of the 4 slits 15s of the annular member 15 (fig. 12 → fig. 13). As a result, as shown in fig. 13, the tube head 11d and the ring member 15 cooperate to grip the tip end 33d of the pen tip holder 33 without play (gap).
Further, since the pen tip holder 33 and the annular member 15 are connected to each other so as to be movable relative to each other by the coil spring 16, even if dimensional control such as the degree of diameter reduction of the inner diameter of the annular member 15 is not performed with high accuracy, it is possible to ensure that the distal end portion 33d of the pen tip holder 33 is effectively gripped without play (gap).
After that, when the retracting operation of the pen tip (for example, the re-pressing operation of the push button provided at the rear end portion of the writing instrument) is performed, for example, the lock mechanism (not shown) is unlocked, and the pen tip 34 (writing body) of the retractable writing instrument 30 is returned to the retracted state shown in fig. 12 by the action of the 2 nd coil spring 12.
In the process from the projected state of fig. 13 to the retracted state of fig. 12, the load from the guide surface 11t of the tube head 11d received by the abutment surface 15t of the annular member 15 is eliminated as the pen tip holder 33 moves to the rear end side. As this occurs, the inner diameter of the annular member 15 having a reduced diameter returns to the original state (fig. 13 → fig. 12).
As described above, according to the retractable writing instrument 30 of the present embodiment, the contact surface 15t of the annular member 15 receives the load from the guide surface 11t of the tube head 11d as the pen tip holder 33 moves toward the distal end side, and therefore the inner diameter of the annular member 15 is reduced by the presence of the slit 15s of the annular member 15. Accordingly, the tube head 11d cooperates with the annular member 15 to grip the tip end 33d of the pen tip holder 33 without play (gap). Further, the tip end portion 33d of the tip holder 33 can be held effectively without play (gap) even without performing highly accurate dimensional control such as the degree of diameter reduction of the inner diameter of the annular member 15 by connecting the tip holder 33 and the annular member 15 to each other so as to be movable relative to each other by the coil spring 16.
In addition, according to the retractable writing instrument 30 of the present embodiment, since the 4 slits 15s as the notches are arranged at equal intervals in the circumferential direction of the annular member 15 and each slit 15s extends in the axial direction of the annular member 15, the inner diameter of the annular member 15 can be reduced in the circumferential direction with good balance.
Further, since the abutment surface 15t and the guide surface 11t are formed into a truncated conical surface shape and a concave truncated conical surface shape corresponding to each other, the abutment surface 15t of the annular member 15 can receive a load with good balance in the circumferential direction, and as a result, the annular member 15 can be reduced in diameter with good balance in the circumferential direction. In this manner, the abutment surface 15t and the guide surface 11t are preferably tapered as they approach the front end. The tapered contact surface 15t may be formed by providing a round corner (R) on the outer periphery of the distal end of the cylindrical annular member 15. The tapered contact surface 15t may have a convex curved surface rotationally symmetric about the axis, and the tapered guide surface 11t may be a concave curved surface or a concave truncated conical surface rotationally symmetric about the axis and having a curvature gentler than that of the convex curved surface.
In the telescopic writing instrument 30 of the present embodiment, the annular member 15 is movable in the axial direction in the region of the distal end portion 33d of the pen tip holder 33, and is formed as a region for gripping the distal end portion 33d of the pen tip holder 33 when the annular member 15 is reduced in diameter. For example, the annular member 15 may be movable in the axial direction in the region of the pen tip 34, and may be formed as a region for gripping the pen tip 34 when the annular member 15 is reduced in diameter.
Further, by appropriately changing the number, size, shape, and the like of the slits 15s, the degree of elasticity (diameter-reducing easiness) of the annular member 15 can be adjusted. Further, the degree of elasticity (diameter-reducing property) of the annular member 15 can also be adjusted by changing the material and/or the thickness of the annular member 15.
In the present embodiment, the ring member 15 and the collar member 32 are fixed to each other by the coil spring 16, and the collar member 32 and the tube head 11 are fixed to each other by the 2 nd coil spring 12. That is, since it is not necessary to provide the annular member 15 on the pen tip holder 33 side, a conventional replacement refill (replacement refill) having a conventional pen tip holder can be used.
Therefore, the invention of the present embodiment can be understood as a shaft tube for a retractable writing instrument that can use a conventional refill. In this case, the present embodiment can be described as a barrel 11 for a retractable writing instrument, in which the barrel 11 is configured to accommodate a pen tip holder 33 having a pen tip 34 fixed to a distal end thereof so as to be movable in an axial direction, and has an opening at the distal end thereof, and the pen tip 34 is configured to be retractable from the opening in accordance with movement of the pen tip holder 33.
The barrel 11 has an annular member 15, a collar member 32, and a 2 nd coil spring 12, wherein the annular member 15 is loosely fitted to the outer periphery of the pen tip holder 33 or the pen tip 34 in a state where the pen tip holder 33 is accommodated, and is movable in the axial direction of the pen tip holder 33 or the pen tip 34 relative to the pen tip holder 34 or the pen tip 34 at the time of the loose fitting; the collar member 32 is connected to the annular member 15 by a coil spring 16 and can be brought into contact with the pen tip holder 33; the 2 nd coil spring 12 supports the collar member 32 on the inner surface of the shaft tube 11. Further, a contact surface 15t tapered toward the front end is formed at least in a part of the outer periphery of the annular member 15, a slit 15s as a notch is formed in a part of the annular member 15, and the inner diameter of the annular member 15 is reduced when a load is applied to the contact surface 15 t. On the other hand, a guide surface 11t tapered toward the front end is formed in a part of the inner surface of the tube head 11d of the barrel 11, and the contact surface 15t receives the load from the guide surface 11t as the pen tip holder 33 moves toward the front end side.
According to the barrel 11, the contact surface 15t of the annular member 15 receives a load from the guide surface 11t of the tube head 11d as the pen tip holder 33 moves toward the distal end side, and therefore the inner diameter of the annular member 15 is reduced by the presence of the slit 15s of the annular member 15. Accordingly, the tube head 11d cooperates with the annular member 15 to grip the tip end 33d of the pen tip holder 33 without play (gap). Further, the tip end portion 33d of the tip holder 33 can be held effectively without play (gap) even without performing highly accurate dimensional control such as the degree of reduction of the inner diameter of the annular member 15 by connecting the tip holder 33 and the annular member 15 to each other so as to be movable relative to each other by the coil spring 16.
< embodiment 4 of the invention 1 >
Fig. 16 is a schematic longitudinal cross-sectional view of the retractable writing instrument 40 according to embodiment 4 of the present invention 1, and shows a state in which the pen tip 34 (writing body) is not projected. Fig. 17 is an enlarged longitudinal sectional view of the tip portion of the retractable writing instrument 40 of the present embodiment. Fig. 18 is an enlarged longitudinal cross-sectional view of the tip end portion of the retractable writing instrument 40 according to the present embodiment in a state where the pen tip 34 (writing body) is projected.
Fig. 19A is a perspective view of the ring member 25 and the collar member 42 of the retractable writing instrument 40 according to the present embodiment, fig. 19B is a side view of the ring member 25 and the collar member 42, fig. 19C is a cross-sectional view taken along line C-C of fig. 19B, fig. 19D is a front view (a view viewed from the distal end side) of the ring member 25 and the collar member 42, and fig. 19E is a rear view of the ring member 25 and the collar member 42. Fig. 19F is an enlarged view of a portion F of fig. 19C.
Fig. 20 is a schematic view showing a state in which the pen tip holder 33 is pulled out for replacement or the like in the retractable writing instrument 40 of the present embodiment.
The pen tip holder 33 and the pen tip 34 of the present embodiment are the same as the pen tip holder 33 and the pen tip 34 of embodiment 3, respectively. Therefore, the same reference numerals are used on the corresponding components.
The retractable writing instrument 40 according to embodiment 4 shown in fig. 16 to 20 has a cylindrical shaft tube 11, and the shaft tube 11 has an opening at the distal end, as in embodiments 1 to 3. As shown in fig. 16 to 18, the shaft tube 11 also includes a rear portion 11a, an inner tube portion 11b, a front portion 11c, and a tube head portion 11d in the present embodiment, the rear portion 11a and the inner tube portion 11b are detachably fixed by screw coupling (screwing), and the inner tube portion 11b and the front portion 11c are formed integrally by two-color molding. However, the rear portion 11a and the inner cylindrical portion 11b may be fixed by fitting and joining, or may be formed integrally. The inner tube portion 11b and the front portion 11c may be fixed by fitting and coupling. On the other hand, the pipe head 11d is detachably fixed to the inner tube portion 11b by screwing (screwing). The material of the pipe head 11d is not limited to metal, and may be resin.
A pen tip holder 33 that is movable in the axial direction of the barrel 11 is housed inside the barrel 11. A pen tip 34 as a writing implement is fixed to the tip end of the pen tip holder 33. As shown in fig. 17 and 18, the pen tip 34 is retractable from the opening of the barrel 11 in accordance with the movement of the pen tip holder 33.
As shown in fig. 20, the pen tip holder 33 includes a base end portion 33a, an intermediate collar portion 33m, and a tip end portion 33d in this order from the base end side toward the tip end side, as in embodiment 3. In the present embodiment, the proximal end portion 33a, the intermediate collar portion 33m, and the distal end portion 33d are all cylindrical portions, and the mutual relationship of the cross-sectional diameters thereof is: the base end portion 33a > the intermediate collar portion 33m > the tip end portion 33 d.
In the present embodiment, as shown in fig. 17 in particular, the annular member 25 made of resin (e.g., made of polyacetal) is loosely fitted to the outer periphery of the tip end portion 33d of the pen tip holder 33. Like embodiment 2, the annular member 25 of the present embodiment is integrally molded with the cylindrical resin spring portion 46e at the base end side thereof. A plurality of notches 46s extending in a direction perpendicular to the axial direction are formed in the resin spring portion 46e so that the resin spring portion 46e can expand and contract in the axial direction.
As shown in fig. 19A to 19F, in a resin spring portion 46e of the present embodiment, substantially the same as the resin spring portion 26e of embodiment 2, a pair of substantially semicircular slits 46s facing in the up-down direction (see also fig. 9F) and a pair of substantially semicircular slits 46s facing in the left-right direction (see also fig. 9G) are alternately formed in each pair in the axial direction, and 7 pairs of the pair of substantially semicircular slits 46s facing in the up-down direction and the pair of substantially semicircular slits 46s facing in the left-right direction are formed. The remaining portion of the paired slits 46s between each other is referred to as a remaining portion 46 b. In the present embodiment, the slits 46s have a uniform width (axial length), and the axial intervals between axially adjacent slits 46s are also uniform, and the former is slightly smaller than the latter. However, these dimensional relationships may be appropriately adjusted as described later to achieve the desired degree of elasticity.
As shown in fig. 19A and 19B, a portion of the resin spring portion 46e closer to the base end side is fixed to the 2 nd collar portion 43c of the collar member 42. As shown in fig. 17 and 18, the 1 st collar portion 43b of the collar member 42 is supported in contact with the intermediate collar portion 33m of the pen tip holder 33 in the axial direction. Accordingly, the annular member 25 can move relative to the tip end portion 33d of the pen tip holder 33 in the axial direction of the pen tip holder 33 along with the expansion and contraction deformation of the resin spring portion 46 e.
As shown in fig. 19A to 19E in particular, in the same manner as in embodiment 2, a truncated conical surface-shaped abutment surface 25t is formed as an abutment surface tapered toward the front end in a front region of the outer periphery of the annular member 25, a cylindrical portion 25a is continuously provided on the rear side of the abutment surface 25t, and a cylindrical resin spring portion 46E having the same diameter as the cylindrical portion 25a is provided on the rear side of the cylindrical portion 25 a. As shown in fig. 19F, the inner diameter 46r of the resin spring portion 46e is larger than the inner diameter 25r of the portion corresponding to the contact surface 25 t.
In addition, as in embodiment 2, the annular member 25 of the present embodiment is also provided with 4 slits 25s as notches. As shown in fig. 19A to 19E, the 4 slits 25s are arranged at equal intervals (every 90 °) in the circumferential direction of the annular member 25. Further, the 4 slits 25s each extend from the front end to the vicinity of the rear end of the cylindrical portion 25a in the axial direction of the annular member 25. Accordingly, when a load is applied to the contact surface 25t, the inner diameter of the annular member 25 flexibly decreases, and when the load is released, the inner diameter of the annular member 25 elastically returns.
As shown in fig. 17 and 18, a guide surface 11t having a concave truncated conical surface shape is formed as a tapered guide surface toward the front end on a part of the inner surface of the tube head portion 11d of the shaft tube 11. Accordingly, the contact surface 25t receives a load from the guide surface 11t as it moves toward the tip end side of the pen tip holder 33 (fig. 17 → fig. 18).
The retractable writing instrument 40 of the present embodiment is also provided with a 2 nd coil spring 12 (a 2 nd elastic member), and the 2 nd coil spring 12 is configured to automatically retract the pen tip holder 33 when a retraction operation of the pen tip 34 is performed (for example, a pressing operation of a pressing button provided at a rear end portion of the writing instrument for releasing a lock mechanism for maintaining the projecting state of the pen tip 34). The 2 nd coil spring 12 is inserted between a shoulder portion provided on the inner surface of the pipe head portion 11d and the 1 st collar portion 43b of the collar member 42 so as to further surround a portion of the outer periphery of the annular member 25.
As shown in fig. 20, the 2 nd coil spring 12 of the present embodiment is fixed to the inner surface of the pipe head portion 11d on the distal end side and to the 1 st collar portion 43b of the collar member 42 on the rear end side. Accordingly, the annular member 25 is supported and fixed to the inner surface of the pipe head portion 11d via the collar member 42 and the 2 nd coil spring 12.
The retractable writing instrument 40 configured as described above functions as follows.
When not in use, the nib 34 (writing body) of the retractable writing instrument 40 is in a retracted state as shown in fig. 17. The annular member 25 including the resin spring portion 46e has an axial length of 11.8mm, and the 2 nd coil spring 12 has an axial length of 15.9 mm. When the pen tip is then protruded (for example, when a push button provided at the rear end of the writing instrument is pushed), the pen tip 34 (writing body) of the retractable writing instrument 40 is in a protruded state as shown in fig. 18. Normally, the position of the pen tip holder 33 is locked in this projected state, and thereafter, the projected state of the pen tip 34 is maintained until the retracting operation of the pen tip is performed. The annular member 25 including the resin spring portion 46e has an axial length of 11.1mm (compression of 0.7mm), and the 2 nd coil spring 12 has an axial length of 8.9mm (compression of 7.0 mm).
In the process from the retracted state of fig. 17 to the projected state of fig. 18, the abutting surface 25t of the annular member 25 receives a load from the guide surface 11t of the tube head 11d as the pen tip holder 33 moves toward the distal end side. At this time, the inner diameter of the annular member 25 is reduced by the presence of the 4 slits 25s of the annular member 25 (see fig. 3B). As a result, as shown in fig. 18, the tube head 11d and the ring member 25 cooperate to grip the tip end 33d of the pen tip holder 33 without play (gap).
Further, since the abutting surface 25t of the pen tip holder 33 and the ring-shaped member 25 can be moved relative to each other by the expansion and contraction action of the resin spring portion 46e, the distal end portion 33d of the pen tip holder 33 can be held effectively without play (gap) even without performing highly accurate dimensional control such as the degree of reduction of the inner diameter of the ring-shaped member 25.
After that, when the retracting operation of the pen tip (for example, the re-pressing operation of the push button provided at the rear end portion of the writing instrument) is performed, for example, a lock mechanism (not shown) is unlocked, and the pen tip 34 (writing body) of the retractable writing instrument 40 is returned to the retracted state shown in fig. 17 by the action of the 2 nd coil spring 12.
In the process from the projected state of fig. 18 to the retracted state of fig. 17, the load from the guide surface 11t of the tube head 11d received by the abutment surface 25t of the annular member 25 disappears as the pen tip holder 33 moves to the rear end side. As this occurs, the inner diameter of the annular member 25 having a reduced diameter returns to the original state (fig. 18 → fig. 17).
As described above, according to the retractable writing instrument 40 of the present embodiment, the contact surface 25t of the annular member 25 receives the load from the guide surface 11t of the tube head 11d as the pen tip holder 33 moves toward the distal end side, and therefore the inner diameter of the annular member 25 is reduced by the presence of the slit 25s of the annular member 25. Accordingly, the tube head 11d cooperates with the annular member 25 to grip the tip end portion 33d of the pen tip holder 33 without play (gap). Further, the contact surface 25t of the pen tip holder 33 and the annular member 25 can be moved relative to each other by the resin spring portion 46e, and thus, even if the dimension control such as the degree of diameter reduction of the inner diameter of the annular member 25 is not performed with high accuracy, it is possible to ensure that the distal end portion 33d of the pen tip holder 33 is effectively gripped without play (gap).
Further, since the inner diameter 46r of the resin spring portion 46e is larger than the inner diameter 25r of the portion corresponding to the abutment surface 25t, even when the resin spring portion 46e contracts and expands toward the inner diameter side, it does not contact the pen tip holder 33.
In addition, according to the retractable writing instrument 40 of the present embodiment, since the 4 slits 25s as the notches are arranged at equal intervals in the circumferential direction of the annular member 25 and each slit 25s extends in the axial direction of the annular member 25, the inner diameter of the annular member 25 can be reduced in the circumferential direction with good balance.
Further, since the abutment surface 25t and the guide surface 11t are formed into a truncated conical surface shape and a concave truncated conical surface shape corresponding to each other, the abutment surface 25t of the annular member 25 can receive a load with good balance in the circumferential direction, and as a result, the annular member 25 can be reduced in diameter with good balance in the circumferential direction. In this manner, the abutment surface 25t and the guide surface 11t are preferably tapered as they approach the front end. The tapered contact surface 25t may be formed by providing a rounded corner (R) on the outer periphery of the distal end of the cylindrical annular member 25. The tapered contact surface 25t may have a convex curved surface rotationally symmetric about the axis, and the tapered guide surface 11t may be a concave curved surface or a concave truncated conical surface rotationally symmetric about the axis and having a curvature gentler than that of the convex curved surface.
In the telescopic writing instrument 40 of the present embodiment, the annular member 25 is movable in the axial direction in the region of the distal end portion 33d of the pen tip holder 33, and is formed as a region for gripping the distal end portion 33d of the pen tip holder 33 when the annular member 25 is reduced in diameter. For example, the annular member 25 may be movable in the axial direction in the region of the pen tip 34, and may be formed as a region for gripping the pen tip 34 when the annular member 25 is reduced in diameter.
Further, by appropriately changing the number, size, shape, and the like of the slits 25s, the degree of elasticity (diameter-reducing property) of the annular member 25 can be adjusted. Further, the degree of elasticity (diameter-reducing property) of the annular member 25 can also be adjusted by changing the material and/or the thickness of the annular member 25.
Further, by appropriately changing the number, size, shape, and the like of the slits 46s, the degree of elasticity (easy stretchability) of the resin spring portion 46e can be adjusted. The slit 46s preferably extends in a direction perpendicular to the axial direction, but may extend obliquely (for example, spirally) to the axial direction.
Further, by changing the thickness of the resin spring portion 46e, the degree of elasticity (easy stretchability) of the resin spring portion 46e can also be adjusted. The resin spring portion 46e may be formed as a separate resin spring member from the contact surface 25t and the cylindrical portion 25a, and may be joined to the cylindrical portion 25 a. In this case, by adjusting the material of the resin spring member, the degree of elasticity (diameter-reducing property) of the resin spring member can be adjusted.
The resin spring portion 46e (or a separate resin spring member) is not limited to the form having the slit 46s, and may have a bellows structure that expands and contracts in the axial direction.
In the present embodiment, the resin spring portion 46e of the annular member 25 and the collar member 42 are fixed to each other, and the collar member 42 and the tube head portion 11 are fixed to each other with the 2 nd coil spring 12 interposed therebetween. That is, since it is not necessary to provide the annular member 25 on the pen tip holder 33 side, the conventional refill having the pen tip holder of the related art can be used.
Therefore, the invention of the present embodiment can be understood as a shaft tube for a retractable writing instrument that can use a conventional refill. In this case, the present embodiment can be described as a barrel 11 for a retractable writing instrument, in which the pen tip holder 33 having the pen tip 34 fixed to the tip end thereof is housed so as to be movable in the axial direction, and the barrel 11 has an opening at the tip end thereof, and the pen tip 34 is retractable from the opening in accordance with the movement of the pen tip holder 33.
The barrel 11 includes an annular member 25, a collar member 42, and a 2 nd coil spring 12, wherein the annular member 25 is loosely fitted to an outer periphery of the pen tip holder 33 or the pen tip 34 in a state where the pen tip holder 33 is accommodated, and is movable in an axial direction of the pen tip holder 33 or the pen tip 34 with respect to the pen tip holder 34 or the pen tip 34 at the time of the loose fitting; the collar member 42 is connected to a portion on the proximal end side of the annular member 25, that is, a portion closer to the proximal end side of the resin spring member 26e, and is capable of abutting against the pen tip holder 33; the 2 nd coil spring 12 supports the collar member 42 on the inner surface of the shaft tube 11. Further, a contact surface 25t tapered toward the front end is formed at least in a part of the outer periphery of the annular member 25, a slit 25s as a notch is formed in a part of the annular member 25, and the inner diameter of the annular member 25 is reduced when a load is applied to the contact surface 25 t. On the other hand, a guide surface 11t tapered toward the front end is formed in a part of the inner surface of the tube head 11d of the barrel 11, and the contact surface 25t receives the load from the guide surface 11t as the pen tip holder 33 moves toward the front end side.
According to the barrel 11, the contact surface 25t of the annular member 25 receives the load from the guide surface 11t of the tube head 11d as the pen tip holder 33 moves toward the distal end side, and therefore the inner diameter of the annular member 15 is reduced by the presence of the slit 25s of the annular member 25. Accordingly, the tube head 11d cooperates with the annular member 25 to grip the tip end portion 33d of the pen tip holder 33 without play (gap). Further, the tip end portion 33d of the pen tip holder 33 can be held effectively without play (gap) even without performing highly accurate dimensional control such as the degree of diameter reduction of the inner diameter of the annular member 25 by allowing the pen tip holder 33 and the annular member 25 to move relative to each other by the resin spring member 46 e.
< one embodiment of the invention 2 >
Fig. 21 is a schematic longitudinal cross-sectional view of the multi-core writing instrument 101 according to the embodiment of the invention 2, and is a view showing a state in which all pen tips (writing bodies) are not projected. On the other hand, fig. 26 is a schematic longitudinal sectional view of the multi-core writing instrument 101 of fig. 21, and is a view showing a state in which a pen tip of a ball-point pen as an example of a writing body is protruded.
As shown in fig. 21 and 26, the multi-core writing instrument 101 of the present embodiment includes a barrel 102, the barrel 102 is composed of a front shaft 103 and a cylindrical rear shaft 104, the front shaft 103 is composed of a tapered cylindrical body, and the rear shaft 104 is attached to a rear end portion of the front shaft 103 by screwing or press-fitting. An opening 131 through which the pen tip 161 of the writing body 106 can protrude is provided at the tip of the front shaft 103 in the axial direction. The front shaft 103 and the rear shaft 104 are formed of synthetic resin (e.g., polycarbonate, etc.) or metal.
On the rear side wall of the rear shaft 104, for example, 5 (2 to 6 are selectable) elongated window holes 141 extending in the front-rear direction are provided so as to penetrate in the radial direction (see fig. 26). The 5 window holes 141 are formed at equal intervals in the circumferential direction, for example.
In the area on the axial center side inside the 5 windows 141 of the rear axle 104, a release bar 143 extending in the front-rear direction extends. The front end of the release lever 143 is supported by a spring support 109 described later. On the other hand, on the inner surface of the side wall between the 5 window holes 141 of the rear shaft 104, a locking wall portion 143a extending in the front-rear direction is formed, and the locking wall portion 143a can lock the rear end of the operating body 107 of the writing body 106 in the pen-tip projecting state. When the rear end of the operating body 107 of the writing body 106 in the state where the pen tip is projected is locked to the locking wall portion 143a, instead, when the operating body 107 of the other writing body 106 is moved forward to project the other writing body 106, the operating body 107 of the other writing body 106 presses the release lever 143 radially outward, and the pressed release lever 143 presses the rear end of the operating body 107 locked to the locking wall portion 143a radially outward, thereby releasing the locked state. Further, a pen clip 144 is provided at one position of the outer surface of the side wall between the 5 window holes 141 of the rear axle 104.
The lid 105 is rotatably provided at the rear end of the rear shaft 104, and the lid 105 is openable and closable at the rear end. One end of the cover 105 can be rotatably connected to the base of the clip 144 via a hinge, for example. The hinge portion may extend in the left-right direction of the clip 144 when the clip 144 is viewed from the front with the pen tip facing downward, for example. In this case, the lid 105 is rotatable substantially in the front-rear direction.
An abutment wall portion is formed on the front surface of the lid portion 105. The rear end of the operating body 107 connected to the rear end of the retracted writing body 106 is stopped by the abutting wall portion (see fig. 21). As the hinge portion, a structure in which the hinge portion is rotatably connected by a rotating shaft is typically used, but in addition to this, a flexible connecting portion that can be bent and deformed may be used.
For example, an engaging portion (e.g., an engaging concave portion or an engaging hole portion) may be provided on a front surface of the other end portion of the cover 105, and an engaged portion (e.g., an engaging convex portion) that can be engaged with the engaging portion may be provided on a rear end of the rear axle 104. More specifically, the inward protrusion may be formed on an inner surface of the engaging portion (the engaging recess or the engaging hole portion), and the outward protrusion may be formed on an outer surface of the engaged portion (the engaging protrusion) so as to go over the inward protrusion and be engaged with the inward protrusion.
In this case, while the lid 105 closes the rear end opening, the engaging portion and the engaged portion are engaged with each other (the inward protrusion and the outward protrusion are beyond the engagement state). This engagement state is not released by the contact between the operating body 107 and the contact wall portion of the lid portion 105 due to the rearward biasing force of the coil spring 108 described later, and the lid portion 105 is not opened.
As shown in fig. 26, each operating body 107 has an operating portion 171, a front side projecting portion 172, a rear side projecting portion 173, an engaging portion 174, and a flange portion 175. The operation portion 171 is formed at the rear end portion of the operation body 107 and protrudes outward from the window hole 141 of the barrel 102. The rear side protrusion 173 is provided on the opposite side (axial center side) of the operation portion 171 of the operation body 107, the front side protrusion 172 is provided in front of the rear side protrusion 173, and the fitting portion 174 is formed at the front end portion of the operation body 107 and fitted into the rear end opening portion of the ink accommodating cylindrical body 163. The flange portion 175 is formed in the vicinity of the rear of the fitting portion 174, and the front surface of the flange portion 175 presses the rear end of the coil spring 108.
Locking projections (not shown) that engage with both side walls of the window hole 141 so as to prevent the locking projections from coming off are formed on both side surfaces of the operating body 107. The handle 107 is obtained from a molded body of a synthetic resin (e.g., a polypropylene resin, an ABS resin, a polyacetal resin, etc.).
When the pen tip 161 of the writing body 106 is in the retracted state, the rear end portion of the operating body 107 attached to the writing body 106 is blocked by the abutting wall portion (see fig. 21). On the other hand, when the pen tip 161 of the writing body 106 is in the protruding state, the rear side protruding portion 173 of the operating body 107 attached to the writing body 106 is in a state of being locked by the locking wall portion 143a formed inside the shaft tube 102 (see fig. 26).
Further, when the operating portion 171 of the operating body 107 is slid forward, if there is another writing body 106 that has been in the protruding state before, the front side protrusion 172 of the operating body 107 connected to the writing body 106 in the pen tip retracted state presses the release lever 143 that is in contact with the rear side protrusion 173 of the operating body 107 connected to the other writing body 106, and releases the locked state between the rear side protrusion 173 and the locking wall portion 143a, that is, the pen tip protruding state of the other writing body 106.
On the other hand, a cylindrical spring support body 109 is provided inside the shaft tube 102 (inside the rear shaft 104). The spring support 109 is provided with 5 inner holes through which the respective writing bodies 106 are inserted, respectively, so as to penetrate in the axial direction. Coil springs 108 are disposed on the rear surface side of the spring support 109 so as to correspond to the respective inner holes. The writing body 106 is loosely inserted into each inner hole 191 and each coil spring 108, and the front surface of the flange portion 175 of the operating body 107 presses the rear end of the coil spring 108.
More specifically, a cylindrical recess is formed in the rear end surface of the spring support 109 so as to correspond to each inner hole. The outer surface of the tip end of each coil spring 108 is pressed into and held in each recess. Accordingly, when the writing body 106 (and the operating body 107) is replaced, the coil spring 108 is prevented from falling off in accordance with the replacement operation.
The coil springs 108 always bias the operating bodies 107 (i.e., the writing bodies 106) rearward. That is, each coil spring 108 is kept in a compressed state (i.e., a state in which the writing body 106 is biased rearward) in both the pen tip protruding state and the pen tip retracting state. This prevents the operating body 107 from shaking back and forth. However, each coil spring 108 is in a non-compressed state (free state) in a state where the writing body 106 is not inserted therein (for example, a state during a writing body replacement operation).
Next, fig. 22 is an enlarged longitudinal sectional view of the tip section of the multi-core writing instrument 101 of fig. 21, and fig. 23 is a sectional view taken along line B-B of fig. 22. Fig. 24A is a side view of the nib 161, nib holder 162, annular member 165, and elastic member 164 of the multi-nib writing instrument 101 of fig. 21, and fig. 24B is a cross-sectional view taken along line a-a of fig. 24A. Fig. 25A is a perspective view of the pen tip holder 162, the annular member 165, and the elastic member 164 of the multi-core writing instrument 101 of fig. 21, and fig. 25B is a longitudinal sectional view of the pen tip holder 162, the annular member 165, and the elastic member 164.
As shown in fig. 25A and 25B, in the present embodiment, the pen tip holder 162, the annular member 165, and the elastic member 164 are integrally formed. The rear end of the pen tip holder 162 is a small diameter portion 162a for fitting to the front end of the ink storage cylinder 163. On the other hand, as shown in fig. 24B and 25B, a fitting hole 162h is provided at the tip end portion of the pen tip holder 162, and the small diameter portion 161a at the rear end portion of the pen tip 161 is fitted into the fitting hole 162h, and the pen tip 161 of the present embodiment is a ballpoint pen tip.
In addition, as shown in fig. 23 and 24B in particular, a ring-shaped member 165 made of resin (e.g., polyacetal) is loosely fitted into the outer periphery of the pen tip 161. The annular member 165 of the present embodiment is integrally molded with the cylindrical resin spring member 164 at the proximal end side thereof. A plurality of slits 164s extending in a direction perpendicular to the axial direction are formed in the resin spring member 164 so that the resin spring member 164 can expand and contract in the axial direction.
As shown in fig. 24A, 24B, 25A, and 25B, in the resin spring member 164 of the present embodiment, pairs of substantially semicircular slits 164s facing in the vertical direction and pairs of substantially semicircular slits 164s facing in the left-right direction are alternately formed in each pair in the axial direction, 4 pairs of substantially semicircular slits 164s facing in the vertical direction are formed, and 3 pairs of substantially semicircular slits 164s facing in the left-right direction are formed. The remaining portions of the paired slits 164s between each other are referred to as ribs 164 b. In the present embodiment, the width (axial length) of each slit 164s is uniform, and the axial interval between the slits 164s adjacent in the axial direction is also uniform, and both are the same. However, these dimensional relationships may be appropriately adjusted as described later to achieve the desired degree of elasticity.
Further, a portion of the resin spring member 164 closer to the proximal end side is integrated with the distal end side of the pen tip holder 162. Accordingly, as shown in fig. 27, the annular member 165 is movable relative to the pen tip 161 in the axial direction of the pen tip 161 in accordance with the expansion and contraction deformation of the resin spring member 164.
As shown in fig. 25A in particular, a truncated conical surface-shaped abutment surface 165t is formed as an abutment surface that tapers toward the front end in a front region of the outer periphery of the annular member 165. A cylindrical portion 165a is continuously provided on the rear side of the contact surface 165t, and a cylindrical resin spring portion 164 having the same diameter as the cylindrical portion 165a is provided on the rear side thereof. In the present embodiment, the inner diameter of the resin spring portion 164 is the same as the inner diameter of the portion corresponding to the contact surface 165 t.
The ring member 165 of the present embodiment is provided with 4 slits 165s as notches. As shown in fig. 25A, the 4 slits 165s are arranged at equal intervals (every 90 °) in the circumferential direction of the annular member 165. Further, the 4 slits 165s each extend from the front end to the vicinity of the rear end of the cylindrical portion 165a in the axial direction of the annular member 165. Accordingly, when a load is applied to the contact surface 165t, the inner diameter of the annular member 165 flexibly decreases, and when the load is released, the inner diameter of the annular member 165 elastically returns.
As shown in fig. 22, a concave frustoconical guide surface 103t is formed in the vicinity of the opening 131 of the front shaft 103 as a guide surface that tapers toward the front end. Accordingly, the contact surface 165t receives a load from the guide surface 103t as the writing body 106 moves toward the front end (fig. 21 → fig. 26).
The multi-core writing instrument 101 configured as described above functions as follows.
As shown in fig. 21 and 22, when the operation portion 171 of one selected operation body 107 is slid forward along the window hole 141 against the rearward biasing force of the coil spring 108 in the case where all the writing bodies 106 are in the retracted state, the pen tip 161 of the writing body 106 coupled to the operation body 107 protrudes outward from the opening 131 of the shaft tube 102. The rear protrusion 173 of the operating body 107 slid forward is again locked to the locking wall 143a in the barrel 102, and the pen tip is maintained in the protruding state.
Alternatively, when the other writing body 106 is in the protruding state, when the operation portion 171 of the selected one operation body 107 is slid forward along the window hole 141 against the rearward biasing force of the coil spring 108, the front side protruding portion 172 of the operation body 107 presses the release lever 143 in the state of abutting against the rear side protruding portion 173 of the other writing body 106 radially outward. Accordingly, the locked state of the locking wall portion 143a and the rear side protruding portion 173 is released, and the other writing body 106 is moved rearward, that is, retracted into the shaft tube 102 by the rearward biasing force of the coil spring 108. The pen tip 161 of the writing body 106 connected to the operating body 107 slid forward projects from the opening 131 of the cylinder 102 to the outside while the other writing body 106 is retracted. The rear protrusion 173 of the operating body 107 slid forward is re-locked to the locking wall 143a in the barrel 102, and the pen tip is maintained in the protruding state.
Fig. 27 is an enlarged longitudinal sectional view of the tip portion of the multi-core writing instrument 101 of fig. 26, and fig. 28 is a sectional view taken along line C-C of fig. 27. As shown in fig. 26 to 28, in any of the above cases, the contact surface 165t of the annular member 165 receives a load from the guide surface 103t of the front shaft 103 as the writing body 106 moves toward the front end side. At this time, the inner diameter of the annular member 165 is reduced by the presence of the 4 slits 165s of the annular member 165. As a result, as shown in fig. 28, the front shaft 103 and the ring member 165 cooperate to hold the pen tip 161 without play (gap).
Further, since the abutting surface 165t of the pen tip holder 162 and the annular member 165 is movable relative to each other by the expansion and contraction action of the resin spring member 164, it is possible to ensure that the pen tip 161 is effectively held without play (gap) even without performing highly accurate dimensional control such as the degree of reduction of the inner diameter of the annular member 165.
Thereafter, for example, when the pen tip 161 that has been protruded is retracted rearward by the rearward urging force of the coil spring 108 in accordance with the operation of protruding the other writing body, the load from the guide surface 103t of the front shaft 103 received by the contact surface 165t of the annular member 165 is eliminated. With this, the inner diameter of the annular member 165 having a reduced diameter is restored to the original state (fig. 28 → fig. 23).
In addition, when the writing body 106 is replaced, the rear end opening of the shaft tube 102 is opened by pressing the operation end portion of the cover portion 105 opposite to the hinge portion rearward in a state where the rear end opening of the shaft tube 102 is closed by the cover portion 105 (see fig. 21), releasing the engagement between the engagement portion and the engaged portion, and rotating the cover portion 105 rearward. At the same time, each operating body 107 is biased rearward by the coil spring 108, and projects rearward and outward from the opening 142. By taking out the operating body 107 from this state, the writing body 106 connected to the operating body 107 can be taken out from the shaft tube 102.
After that, a new writing body 106 (and a new operating body 107) is inserted into the shaft tube 102 through the rear end opening. Then, each operating body 107 is brought into contact with the contact wall portion of the lid portion 105, and the lid portion 105 is rotated forward so that each operating body 107 is pressed forward, whereby the engaging portion is engaged with the engaged portion, and the lid portion 105 is closed. As this occurs, the front surface of the flange 175 of the new operating body 107 is in a state of pressing the rear end of the corresponding coil spring 108, and the replacement operation of the writing body 106 (and the operating body 107) is completed.
As described above, according to the multi-core writing instrument 101 of the present embodiment, as the writing body 106 (including the pen tip holder 162) moves toward the distal end side, the contact surface 165t of the annular member 165 receives a load from the guide surface 103t of the front shaft 103, and the inner diameter of the annular member 165 is reduced by the presence of the slit 165s of the annular member 165. Accordingly, the front shaft 103 and the annular member 165 cooperate to grip the tip end portion of the pen tip 161 without play (gap). Further, the contact surface 165t of the pen tip 161 and the annular member 165 is connected to each other so as to be movable relative to each other by the resin spring member 164, and thus, even if highly accurate dimensional control such as the degree of reduction of the inner diameter of the annular member 165 is not performed, it is possible to ensure that the pen tip 161 is effectively held without play (gap).
In addition, according to the multi-core writing instrument 101 of the present embodiment, since the 4 slits 165s as the notches are arranged at equal intervals in the circumferential direction of the annular member 165 and the slits 165s extend in the axial direction of the annular member 165, the inner diameter of the annular member 165 can be reduced in the circumferential direction with good balance.
Further, since the contact surface 165t and the guide surface 103t have a truncated conical surface shape and a concave truncated conical surface shape corresponding to each other, the contact surface 165t of the annular member 165 can receive a load with good balance in the circumferential direction, and as a result, the annular member 165 can be reduced in diameter with good balance in the circumferential direction. In this manner, the abutment surface 165t and the guide surface 103t are preferably tapered as they approach the front end. The tapered contact surface 165t may be formed by providing a rounded corner (R) on the outer periphery of the distal end of the cylindrical annular member 165. The tapered contact surface 165t has a convex curved surface rotationally symmetric about the axis, and the tapered guide surface 103t may be a concave curved surface or a concave truncated conical surface rotationally symmetric about the axis and having a curvature gentler than that of the convex curved surface.
In the multi-core writing instrument 101 of the present embodiment, the annular member 165 is movable in the axial direction in the region of the pen tip 161, and is formed as a region for gripping the pen tip 161 when the annular member 165 is reduced in diameter. For example, the annular member 165 may be movable in the axial direction in a region holding another member (e.g., a pen tip holder) of the pen tip 161, and may be formed as a region for gripping the other member when the annular member 165 is reduced in diameter.
Further, by appropriately changing the number, size, shape, and the like of the slits 165s, the degree of elasticity (diameter-reducing property) of the annular member 165 can be adjusted. Further, the degree of elasticity (diameter-reducing property) of the annular member 165 can be adjusted by changing the material and/or the thickness of the annular member 165.
Further, by appropriately changing the number, size, shape, and the like of the slits 164s, the degree of elasticity (easy stretchability) of the resin spring member 164 can be adjusted. The slit 164s preferably extends in a direction perpendicular to the axial direction, but may extend obliquely (for example, spirally) to the axial direction.
Further, by changing the thickness of the resin spring member 164, the degree of elasticity (stretchability) of the resin spring member 164 can be adjusted. The resin spring member 164 may be formed as a separate resin spring member from the annular member 165 (the contact surface 165t and the cylindrical portion 165a) and joined to the cylindrical portion 165 a. In this case, by adjusting the material of the resin spring member, the degree of elasticity (diameter-reducing property) of the resin spring member can be adjusted.
The resin spring member 164 (or a separate resin spring member) is not limited to the form having the slit 164s, and may have a bellows structure that expands and contracts in the axial direction.
Further, a plurality of types of refill having different refill diameters (the diameter of the nib 161, the nib holder 162, and/or the ink containing cylinder 163) may be used in combination.
In addition, a replacement member for holding a friction member as the pen tip 161 may be used instead of the writing body. The friction member is an eraser or a rubber (eraser) for generating frictional heat for a thermochromic writing instrument. In this case, the friction member can be prevented from being shaken when handwriting is erased, so that a more stable handwriting erasing feeling can be obtained.
In the above description, the pen tip holder 162 is moved toward the distal end side by sliding the operation portion 171 of the operation body 107, but instead of this, a so-called rotary feed mechanism may be used.
< one embodiment of the invention 3 >
Fig. 29 is a schematic longitudinal cross-sectional view of the multi-core writing instrument 201 according to the embodiment of the invention 3, and is a view showing a state in which all pen tips (writing bodies) are not projected. On the other hand, fig. 33 is a schematic longitudinal sectional view of the multi-core writing instrument 201 of fig. 29, and is a view showing a state in which a pen tip of a ball-point pen as an example of a writing body is protruded.
As shown in fig. 29 and 33, the multi-core writing instrument 201 of the present embodiment includes a barrel 202, the barrel 202 is composed of a front shaft 203 and a cylindrical rear shaft 204, the front shaft 203 is composed of a tapered cylindrical body, and the rear shaft 204 is attached by screwing or press-fitting to a rear end portion of the front shaft 203. An opening 231 through which a pen tip 261 of the writing body 206 can protrude is provided at the tip of the front shaft 203 in the axial direction. The front shaft 203 and the rear shaft 204 are formed of synthetic resin (e.g., polycarbonate, etc.) or metal.
On the rear side wall of the rear shaft 204, for example, 5 (2 to 6 are selectable) elongated window holes 241 extending in the front-rear direction are provided so as to penetrate in the radial direction (see fig. 33). The 5 window holes 241 are formed at equal intervals in the circumferential direction, for example.
In the area on the axial center side inside the 5 windows 241 of the rear shaft 204, a release lever 243 extending in the front-rear direction extends. The front end of the release lever 243 is supported by a spring support 209 described later. On the other hand, a locking wall portion 243a extending in the front-rear direction is formed on the inner surface of the side wall between the 5 window holes 241 of the rear shaft 204, and the locking wall portion 243a can lock the rear end of the operating body 207 of the writing body 206 in the pen-tip-protruding state. When the rear end of the operating body 207 of the writing body 206 in the state where the pen tip is projected is caught by the catching wall portion 243a, instead, when the operating body 207 of the other writing body 206 is moved forward in order to project the other writing body 206, the operating body 207 of the other writing body 206 presses the release lever 243 radially outward, and the pressed release lever 243 presses the rear end of the operating body 207 caught by the catching wall portion 243a radially outward, thereby releasing the catching state. Further, a pen clip 244 is provided at one position of the outer surface of the sidewall between the 5 window holes 241 of the rear axle 204.
The lid 205 is rotatably provided at the rear end portion of the rear shaft 204, and the lid 205 is openable and closable at the rear end portion. One end of the cover 205 can be rotatably connected to the base of the clip 244, for example, by a hinge. The hinge portion can be provided to extend in the left-right direction of the clip 244 when the clip 244 is viewed from the front with the pen tip facing downward, for example. In this case, the lid 205 can freely rotate in the substantially front-rear direction.
An abutment wall portion is formed on the front surface of the lid portion 205. The rear end of the operating body 207 coupled to the rear end of the writing body 206 in the retracted state is stopped by the abutting wall portion (see fig. 29). As the hinge portion, a structure in which the hinge portion is rotatably connected by a rotating shaft is typically used, but in addition to this, a flexible connecting portion or the like that can be bent and deformed may be used.
For example, an engaging portion (e.g., an engaging concave portion or an engaging hole portion) may be provided on a front surface of the other end portion of the cover 205, and an engaged portion (e.g., an engaging convex portion) that can be engaged with the engaging portion may be provided on a rear end of the rear axle 204. More specifically, the inward protrusion may be formed on an inner surface of the engaging portion (the engaging recess or the engaging hole portion), and the outward protrusion may be formed on an outer surface of the engaged portion (the engaging protrusion) so as to go over the inward protrusion and be engaged with the inward protrusion.
In this case, while the lid 205 closes the rear end opening, the engaging portion and the engaged portion are engaged with each other (the inward protrusion and the outward protrusion are beyond the locking state). This engagement state is not released by the contact between the operating body 207 and the contact wall portion of the lid portion 205 due to the rearward biasing force of the coil spring 208 described later, and the lid portion 205 is not opened.
As shown in fig. 33, each operating body 207 has an operating portion 271, a front side projecting portion 272, a rear side projecting portion 273, an insertion portion 274, and a flange portion 275. Operation portion 271 is formed at the rear end portion of operation body 207 and protrudes outward from window hole 241 of cylinder 202. The rear side protrusion 273 is provided on the opposite side (axial center side) of the operation portion 271 of the operation body 207, the front side protrusion 272 is provided in front of the rear side protrusion 273, and the fitting portion 274 is formed at the front end portion of the operation body 207 and fitted into the rear end opening portion of the pen tip holder 263 also serving as an ink storage cylinder. The flange portion 275 is formed in the vicinity of the rear of the fitting portion 274, and the front surface of the flange portion 275 presses the rear end of the coil spring 208.
Locking projections (not shown) that are locked to both side walls of the window hole 241 so as to be prevented from coming off are formed on both side surfaces of the operating body 207. The handle 207 is obtained from a molded body of a synthetic resin (for example, a polypropylene resin, an ABS resin, a polyacetal resin, or the like).
When the pen tip 261 of the writing body 206 is in the retracted state, the rear end portion of the operating body 207 attached to the writing body 206 is in a state blocked by the contact wall portion (see fig. 29). On the other hand, when the pen tip 261 of the writing body 206 is in the protruding state, the rear side protruding portion 273 of the operating body 207 attached to the writing body 206 is in a state of being locked by the locking wall portion 243a formed inside the shaft tube 202 (see fig. 33).
Further, when the operation portion 271 of the operation body 207 is slid forward, if another writing body 206 which has been in the protruding state before exists, the front side protrusion 272 of the operation body 207 coupled to the writing body 206 in the pen tip retracted state presses the release lever 243 which is in contact with the rear side protrusion 273 of the operation body 207 coupled to the other writing body 206, and releases the locked state between the rear side protrusion 273 and the locking wall portion 243a, that is, the pen tip protruding state of the other writing body 206.
On the other hand, a cylindrical spring support body 209 is provided inside the shaft tube 202 (inside the rear shaft 204). The spring support 209 is provided with 5 inner holes through which the respective writing bodies 206 are inserted, respectively, so as to penetrate in the axial direction. Coil springs 208 are disposed on the rear surface side of the spring support 209 so as to correspond to the respective inner holes. The writing body 206 is loosely inserted into each inner hole 291 and each coil spring 208, and the front surface of the flange portion 275 of the operating body 207 presses the rear end of the coil spring 208.
More specifically, a cylindrical recess is formed in the rear end surface of the spring support 209 so as to correspond to each inner hole. The outer surface of the tip end of each coil spring 208 is pressed into and held in each recess. Accordingly, when the writing body 206 (and the operating body 207) is replaced, the coil spring 208 is prevented from falling off in accordance with the replacement operation.
The coil springs 208 always urge the operating bodies 207 (i.e., the writing bodies 206) rearward. That is, each coil spring 208 is kept in a compressed state (i.e., a state in which the writing body 206 is biased rearward) in both the pen tip protruding state and the pen tip retracting state. This prevents the operating body 207 from shaking back and forth. However, each coil spring 208 is in a non-compressed state (free state) in a state where the writing body 206 is not inserted therein (for example, a state during a writing body replacement operation).
Next, fig. 30 is an enlarged longitudinal sectional view of the tip section of the multi-core writing instrument 201 of fig. 29, and fig. 31 is a sectional view taken along line a-a of fig. 30. Fig. 32A is a perspective view of the ring member 235, the elastic member 234, and the collar member 233 of the multi-core writing instrument 201 of fig. 29, fig. 32B is a side view of the ring member 235, the elastic member 234, and the collar member 233, fig. 32C is a cross-sectional view taken along line C-C of fig. 32B, fig. 32D is a front view (view from the distal end side) of the ring member 235, the elastic member 234, and the collar member 233, and fig. 32E is a rear view of the ring member 235, the elastic member 234, and the collar member 233.
As shown in fig. 29, 30, 33, and 34, the multi-core writing instrument 201 of the present embodiment is provided with an annular member 235 (for example, made of polyacetal), and the annular member 235 is configured to be loosely fitted to the outer periphery of the pen tip 261 fixed to 1 of the pen tip holders 263 in accordance with the movement of the tip holder 263 of the plurality of pen tip holders (ink accommodating cylinder) 263 toward the tip end side, and to be movable in the axial direction of the pen tip 261 relative to the pen tip 261 at the time of the loose fitting.
In particular, as shown in fig. 32A and 32C, a truncated conical surface-shaped abutment surface 235t is formed as an abutment surface tapered toward the front end in the front region of the outer periphery of the annular member 235. A cylindrical portion 235a is continuously provided on the rear side of the contact surface 235t, and a cylindrical resin spring portion 234 having the same diameter as the cylindrical portion 235a is integrally formed on the rear side of the cylindrical portion 235 a. In the present embodiment, the inner diameter of the resin spring portion 234 is the same as the inner diameter of the portion corresponding to the contact surface 235 t.
The resin spring member 234 is formed with a plurality of slits 234s extending in a direction perpendicular to the axial direction so that the resin spring member 234 can expand and contract in the axial direction. Specifically, as shown in fig. 30, 32A, and 32C, in the resin spring member 234 of the present embodiment, pairs of substantially semicircular slits 234s facing in the vertical direction and pairs of substantially semicircular slits 234s facing in the horizontal direction are alternately formed in each pair in the axial direction, 2 pairs of the substantially semicircular slits 234s facing in the vertical direction are formed, and 1 pair of the substantially semicircular slits 234s facing in the horizontal direction is formed. The remaining portions of the paired slits 234s between each other are referred to as ribs 234 b. In the present embodiment, the width (axial length) of each slit 234s is uniform, and the axial interval between the slits 234s adjacent in the axial direction is also uniform, and both are the same. However, these dimensional relationships may be appropriately adjusted as described later to achieve the desired degree of elasticity.
A collar member 233 is integrally molded with the resin spring member 234 at a portion closer to the proximal end side. In particular, as shown in fig. 32C, the collar member 233 is formed entirely of a tapered cylindrical body, and a rear end collar portion 233b having a large diameter is provided at the rear end portion. As shown in fig. 2, the rear-end collar portion 233b is fixed to the inner surface of the front shaft 203 via a coil spring 232. In addition, the collar member 233 of the present embodiment is provided with a spring fixing auxiliary portion 233f for assisting the fixing of the coil spring 232 and the rear end collar portion 233 b.
That is, the collar member 233 includes a rear-end collar portion 233b, a spring fixing assistance portion 233f, a main body portion 233a, and a tapered portion 233t in this order from the base end side (rear end side) toward the tip end side. In the present embodiment, the rear end collar portion 233b, the spring fixing assistance portion 233f, and the main body portion 233a are all cylindrical portions, and their cross-sectional diameters have a relationship: the rear end collar portion 233b > the spring fixing auxiliary portion 233f > the main body portion 233 a.
As shown in fig. 30 and 32C, an enlarged diameter portion 233e is provided on the inner surface side of the tapered portion 233t, and the enlarged diameter portion 233e abuts against the tip end portion of the pen tip holder 263 (ink accommodating cylinder) having a larger diameter (having a step) than the rear end portion of the pen tip 261. Accordingly, when the pen tip holder 263 moves toward the distal end side, the distal end portion of the pen tip holder 263 abuts against the enlarged diameter portion 233e, and presses the collar member 233 toward the distal end side while compressing the coil spring 232.
In addition, the ring-shaped member 235 of the present embodiment is provided with 4 slits 235s as notches. As shown in fig. 32A, the 4 slits 235s are arranged at equal intervals (every 90 °) in the circumferential direction of the annular member 235. Further, the 4 slits 235s each extend from the front end to the vicinity of the rear end of the cylindrical portion 235a in the axial direction of the annular member 235. Accordingly, when a load is applied to the contact surface 235t, the inner diameter of the annular member 235 flexibly decreases, and when the load is released, the inner diameter of the annular member 235 elastically returns.
On the other hand, as shown in fig. 30, a guide surface 203t having a concave truncated conical surface shape is formed as a tapered guide surface toward the front end in the vicinity of the opening 231 of the front shaft 203. Accordingly, the contact surface 235t receives a load from the guide surface 203t when the collar member 233 and the ring member 235 move toward the distal end side in accordance with the movement of the writing body 206 toward the distal end side (fig. 29 → fig. 33). Then, due to this load, the annular member 235 is reduced in diameter by the presence of the slit 235s, and moves in the axial direction of the pen tip 261 relative to the pen tip 261 in accordance with the compressive deformation of the resin spring member 234.
The multi-core writing instrument 201 configured as described above functions as follows.
As shown in fig. 29 and 30, when all the writing bodies 206 are in the retracted state and the operation portion 271 of one selected operation body 207 is slid forward along the window hole 241 against the rearward biasing force of the coil spring 208, the tip end portion of the pen tip holder 263 of the writing body 206 connected to the operation body 207 moves the collar member 233 toward the tip end side via the enlarged diameter portion 233e while resisting the coil spring 232, and the pen tip 261 of the writing body 206 protrudes outward from the opening 231 of the shaft tube 202. The rear side protruding portion 273 of the operating body 207 slid forward is re-locked to the locking wall portion 243a inside the cylinder 202, and the pen tip protruding state is maintained.
Alternatively, when the other writing tool 206 is in the protruding state, when the operation portion 271 of the selected one of the operation bodies 207 is slid forward along the window hole 241 against the rearward biasing force of the coil spring 208, the front side protruding portion 272 of the operation body 207 presses the release lever 243 in the state of abutting against the rear side protruding portion 273 of the other writing tool 206 radially outward. Accordingly, the locked state between the locking wall 243a and the rear side protruding portion 273 is released, and the other writing body 206 is moved rearward, that is, retracted into the shaft tube 202, by the rearward biasing force of the coil spring 208. While the other writing body 206 is retracted, the tip end portion of the pen tip holder 263 of the writing body 206 coupled to the operating body 207 slid forward moves the collar member 233 toward the tip end side via the enlarged diameter portion 233e against the coil spring 232, and the pen tip 261 of the writing body 206 projects outward from the opening 231 of the shaft cylinder 202. The rear side protruding portion 273 of the operating body 207 slid forward is re-locked to the locking wall portion 243a in the barrel 202, and the pen tip protruding state is maintained.
Fig. 34 is an enlarged longitudinal sectional view of the tip portion of the multi-core writing instrument 201 of fig. 33, and fig. 35 is a sectional view taken along line B-B of fig. 34. As shown in fig. 33 to 35, in any of the above cases, the contact surface 235t of the annular member 235 receives a load from the guide surface 203t of the front shaft 203 as the writing body 206 moves toward the front end side. At this time, the inner diameter of the annular member 235 is reduced by the presence of the 4 slits 235s of the annular member 235. As a result, as shown in fig. 35, the front shaft 203 and the annular member 235 cooperate to hold the pen tip 261 without play (gap).
Further, since the collar member 233 that engages with the pen tip holder 263 that holds the pen tip 261 via the enlarged diameter portion 233e and the contact surface 235t of the annular member 235 are movable relative to each other by the expansion and contraction action of the resin spring member 234, it is possible to ensure that the pen tip 261 is effectively held without play (gap) even without performing highly accurate dimensional control such as the degree of reduction of the inner diameter of the annular member 235.
After that, for example, when the pen tip 261 which has been protruded is retracted rearward by a rearward urging force of the coil spring 208 in accordance with the operation of protruding another writing body, the collar member 233 is also returned to the original position by the restoring force of the coil spring 232. As a result, the load from the guide surface 203t of the front shaft 203 received by the contact surface 235t of the annular member 235 is also eliminated, and the inner diameter of the reduced-diameter annular member 235 is returned to the original state (fig. 35 → fig. 31).
When the writing body 206 is to be replaced, the rear end opening of the shaft tube 202 is opened by pressing the operation end portion of the cover 205 opposite to the hinge portion rearward in a state where the rear end opening of the shaft tube 202 is closed by the cover 205 (see fig. 29), releasing the engagement between the engagement portion and the engaged portion, and rotating the cover 205 rearward. At the same time, each operating body 207 is biased rearward by the coil spring 208 and projects rearward and outward from the opening 242. By taking out the operating body 207 from this state, the writing body 206 connected to the operating body 207 can be taken out from the shaft tube 202.
After that, a new writing body 206 (and a new operating body 207) is inserted into the shaft tube 202 through the rear end opening. Then, each operating body 207 is brought into contact with the contact wall portion of the lid portion 205, and the lid portion 205 is rotated forward so that each operating body 207 is pressed forward, whereby the engaging portion is engaged with the engaged portion, and the lid portion 205 is closed. As this occurs, the front surface of the flange 275 of the new operating body 207 presses the rear end of the corresponding coil spring 208, and the work of replacing the writing body 206 (and the operating body 207) is completed.
As described above, according to the multi-core writing instrument 201 of the present embodiment, as the writing body 206 (including the pen tip holder 263) moves toward the distal end side, the annular member 235 moves toward the distal end side via the collar member 233 (including the diameter-enlarged portion 233e) and the resin spring member 234, and the contact surface 235t of the annular member 235 receives the load from the guide surface 203t of the front shaft 203, whereby the inner diameter of the annular member 235 is reduced by the presence of the slit 235s of the annular member 235. Accordingly, the front shaft 203 and the annular member 235 cooperate to grip the tip end portion of the pen tip 261 without play (gap). Further, the collar member 233 and the annular member 235 that are in contact with the pen tip holder 263 are connected by the resin spring member 234, and thus, even if the dimensional control such as the degree of reduction of the inner diameter of the annular member 235 is not performed with high accuracy, it is possible to ensure that the pen tip 261 is held effectively without rattling (play).
In addition, according to the multi-core writing instrument 201 of the present embodiment, since the 4 slits 235s as the notches are arranged at equal intervals in the circumferential direction of the annular member 235 and each slit 235s extends in the axial direction of the annular member 235, the inner diameter of the annular member 235 can be reduced in the circumferential direction with good balance.
Further, since the contact surface 235t and the guide surface 203t have a truncated conical surface shape and a concave truncated conical surface shape corresponding to each other, the contact surface 235t of the annular member 235 can receive a load with good balance in the circumferential direction, and as a result, the annular member 235 can be reduced in diameter with good balance in the circumferential direction. In this manner, the abutment surface 235t and the guide surface 203t are preferably tapered as they approach the front end. The tapered contact surface 235t may be formed by providing a rounded corner (R) on the outer periphery of the distal end of the cylindrical annular member 235. The tapered contact surface 235t may have a convex curved surface rotationally symmetric about the axis, and the tapered guide surface 203t may be a concave curved surface or a concave truncated conical surface rotationally symmetric about the axis and having a curvature gentler than that of the convex curved surface.
In the multi-core writing instrument 201 of the present embodiment, the annular member 235 is movable in the axial direction in the region of the pen tip 261, and is formed as a region for gripping the pen tip 261 when the annular member 235 is reduced in diameter. For example, the annular member 235 may be movable in the axial direction in a region of another member (e.g., a pen tip holder) holding the pen tip 261, and may be formed as a region for gripping the other member when the annular member 235 is reduced in diameter.
Further, by appropriately changing the number, size, shape, and the like of the slits 235s, the degree of elasticity (diameter-reducing property) of the annular member 235 can be adjusted. Further, the degree of elasticity (diameter-reducing property) of the annular member 235 can be adjusted by changing the material and/or the thickness of the annular member 235.
Further, by appropriately changing the number, size, shape, and the like of the slits 234s, the degree of elasticity (easy stretchability) of the resin spring member 234 can be adjusted. The slit 234s preferably extends in a direction perpendicular to the axial direction, but may extend obliquely (for example, spirally) to the axial direction.
Further, by changing the thickness of the resin spring member 234, the degree of elasticity (stretchability) of the resin spring member 234 can also be adjusted. The resin spring member 234 may be formed as a separate resin spring member from the annular member 235 (the contact surface 235t and the cylindrical portion 235a) and joined to the cylindrical portion 235 a. In this case, by adjusting the material of the resin spring member, the degree of elasticity (diameter-reducing property) of the resin spring member can be adjusted.
The resin spring member 234 (or a separate resin spring member) is not limited to the one having the slit 234s, and may have a bellows structure that can expand and contract in the axial direction.
In addition, a plurality of replacement cartridges having different replacement diameters (the diameter of the pen tip 261 and/or the pen tip holder 263) may also be mixedly used.
Instead of the writing body, a replaceable member for holding a friction member as the pen tip 261 may be used. The friction member is an eraser or a rubber (eraser) for generating frictional heat for a thermochromic writing instrument. In this case, the friction member can be prevented from being shaken when handwriting is erased, so that a more stable handwriting erasing feeling can be obtained.
Further, in the present embodiment, the elastic member 235, the resin spring member 234, and the collar member 233 are fixed to each other, and the collar member 233 and the front shaft 203 are fixed to each other by the coil spring 232. That is, since it is not necessary to provide the elastic member 235 on the writing body 206 side, the conventional refill having the conventional pen tip holder can be used.
Therefore, the invention of the present embodiment can be grasped as a barrel for a multi-core writing instrument that can use a conventional refill. In this case, the present embodiment can be described as a barrel 202 for a multi-core writing instrument, in which the barrel 202 is configured to accommodate a plurality of pen tip holders 263, each of which has a pen tip 261 fixed to a distal end thereof, so as to be movable in an axial direction, and has an opening 231 at the distal end thereof, and the pen tip 261 fixed to 1 of the plurality of pen tip holders 263 can be extended and retracted from the opening 231 in accordance with the movement of the 1 of the plurality of pen tip holders 263.
The shaft 202 includes an annular member 235, a collar member 233, and a coil spring 232, and the annular member 235 is loosely fitted to the outer periphery of the pen tip 261 fixed to the 1 pen tip holder 263 in accordance with the movement of the 1 pen tip holder 263 toward the tip end side, and is movable in the axial direction of the pen tip 261 relative to the pen tip 261 when loosely fitted; the collar member 233 is connected to the annular member 235 via the resin spring member 234 and is capable of abutting against the 1-piece tip holder 263 in accordance with the movement of the 1-piece tip holder 263 toward the front end side; coil spring 232 supports collar member 233 on the inner surface of front shaft 203. Further, a contact surface 235t tapered toward the front end is formed at least in a part of the outer periphery of the annular member 235, a slit 235s as a notch is formed in a part of the annular member 235, and the inner diameter of the annular member 235 is reduced when a load is applied to the contact surface 235 t. On the other hand, a guide surface 203t tapered toward the tip end is formed on a part of the inner surface of the front shaft 203, and when the annular collar 233 and the elastic member 234 move the annular member 235 toward the tip end side as the pen tip holder 263 moves toward the tip end side, the contact surface 235t receives the load from the guide surface 203 t.
According to the shaft barrel 202, as the writing body 206 (including the pen tip holding frame 263) moves toward the distal end side, the collar member 233 (including the enlarged diameter portion 233e) and the resin spring member 234 move toward the distal end side, and the abutment surface 235t of the ring member 235 receives the load from the guide surface 203t of the front shaft 203, so that the inner diameter of the ring member 235 is reduced by the presence of the slit 235s of the ring member 235. Accordingly, the front shaft 203 and the annular member 235 cooperate to grip the tip end portion of the pen tip 261 without play (gap). Further, by connecting the collar member 233 and the annular member 235, which are in contact with the pen tip holder 263, by the resin spring member 234, it is possible to ensure that the pen tip 261 is held effectively without play (gap) even if dimensional control is performed with high accuracy, such as the degree of reduction of the inner diameter of the annular member 235.
In the above description, the mechanism for moving the pen tip holder 263 toward the front end side is a mechanism for sliding the operation portion 271 of the operation body 207, but instead, a so-called rotational feed mechanism may be used.
[ description of reference numerals ]
10. 20, 30, 40: a retractable writing instrument; 11: a shaft (common to each embodiment); 11 a: a rear portion; 11 b: an inner cylinder part; 11 c: a front portion; 11 d: a tube head; 11 t: a guide surface; 12: a 2 nd coil spring (an example of the 2 nd elastic member: common to the respective embodiments); 13: a pen tip holder (embodiment 1); 13 a: a base end portion; 13 b: 1 st collar part; 13 c: a 2 nd collar portion; 13 d: a tip portion; 13 f: a spring fixing auxiliary part; 14: a pen tip (writing implement) (embodiment 1); 15: a ring member (common to embodiments 1 and 3); 15 a: a large outer diameter cylindrical portion; 15 b: a small outer diameter cylindrical portion; 15 t: an abutting surface; 15 s: a slit; 16: a coil spring (an example of an elastic member: common to embodiments 1 and 3); 23: a pen tip holder (embodiment 2); 23 a: a base end portion; 23 b: 1 st collar part; 23 c: a 2 nd collar portion; 23 d: a tip portion; 24: a pen tip (writing body); 25: a ring member (common to embodiments 2 and 4); 25 a: a cylindrical portion; 25 t: an abutting surface; 25 s: a slit; 25 r: an inner diameter; 26 e: a resin spring portion (an example of an elastic member: embodiment 2); 26 s: a slit; 26 b: a rib; 26 r: an inner diameter; 32: a collar member; 33: a pen tip holder (common to embodiments 3 and 4); 33 a: a base end portion; 33 m: a middle collar portion; 33 d: a tip portion; 33 b: 1 st collar part; 33 c: a 2 nd collar portion; 34: a pen tip (writing body) (common to embodiments 3 and 4); 42: a collar member; 43 b: 1 st collar part; 43 c: a 2 nd collar portion; 46 e: a resin spring portion (an example of an elastic member: embodiment 4); 46 s: a slit; 46 b: a rib; 46 r: an inner diameter; 101: a multi-core writing instrument; 102: a shaft cylinder; 103: a front axle; 103 t: a guide surface; 131: an opening; 104: a rear axle; 141: a window aperture; 143: a release lever; 143 a: a locking wall portion; 144: a pen clip; 105: a cover portion; 106: writing bodies (ball-point pens); 161: a pen point; 161 a: a small diameter part; 162: a pen point holder; 162 a: a small diameter part; 162 h: a fitting hole; 163: an ink accommodating tube section; 164: a resin spring member (an example of an elastic member); 164 s: a slit; 164 b: a rib; 165: an annular member; 165 s: a slit; 165 t: an abutting surface; 165 a: a cylindrical portion; 107: an operation body; 171: an operation section; 172: a front side protrusion; 173: a rear side protrusion; 174: an insertion section; 175: a flange portion; 108: a coil spring; 109: a spring support body; 201: a multi-core writing instrument; 202: a shaft cylinder; 203: a front axle; 203 t: a guide surface; 231: an opening; 232: a coil spring (an example of the 2 nd elastic member); 233: a collar member (an example of an annular collar); 233 a: a main body portion; 233 t: a sharp thin part; 233 b: a rear end collar portion; 233 e: an expanding portion; 233 f: a spring fixing auxiliary part; 234: a resin spring member (an example of an elastic member); 234 s: a slit; 234 b: a rib; 235: an annular member; 235 s: a slit; 235 t: an abutting surface; 235 a: a cylindrical portion; 204: a rear axle; 241: a window aperture; 243: a release lever; 243 a: a locking wall portion; 244: a pen clip; 205: a cover portion; 206: writing bodies (ball-point pens); 261: a pen point; 263: a pen point holder (ink accommodating cylinder); 207: an operation body; 271: an operation section; 272: a front side protrusion; 273: a rear side protrusion; 274: an insertion section; 275: a flange portion; 208: a coil spring; 209: a spring support.
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