阅读说明：本技术 折叠桌 (Folding table ) 是由 上田晃広 堀尾浩司 于 2019-12-27 设计创作，主要内容包括：本发明提供一种折叠桌,在简化结构,改善外观和提高使用上的安全性的同时,免除繁杂的焊接,能够容易且合理地制作,并且将凸轮块和支承块容易且牢固地固定于可转动地支承桌面和角铁的转动轴,使得能够稳定且可靠地进行桌面的折叠动作。一种下述折叠桌：将角铁(3)固定于桌面(2)的下表面。在所述角铁(3)内配置转动轴(6),使角铁(3)和桌面(2)可转动地支承于该转动轴(6)。在所述角铁(3)内配置形成有第一及第二凸轮槽(32、33)的凸轮块(24)。将锁定凸轮(34)可旋转地配置在所述凸轮块(24)的外侧。使所述锁定凸轮(34)可与所述第一及第二凸轮槽(32、33)接合。将凸轮块(24)固定于所述转动轴(6)。(The invention provides a folding table, which can be easily and reasonably manufactured by simplifying the structure, improving the appearance and improving the use safety, and simultaneously avoiding complicated welding, and can be used for stably and reliably folding the table top by easily and firmly fixing a cam block and a supporting block on a rotating shaft which rotatably supports the table top and an angle iron. The following folding table: the angle iron (3) is fixed on the lower surface of the table top (2). A rotating shaft (6) is disposed in the angle iron (3), and the angle iron (3) and the tabletop (2) are rotatably supported by the rotating shaft (6). A cam block (24) having first and second cam grooves (32, 33) formed therein is disposed in the angle bar (3). A lock cam (34) is rotatably disposed outside the cam block (24). So that the lock cam (34) is engageable with the first and second cam grooves (32, 33). A cam block (24) is fixed to the rotating shaft (6).)

1. A folding table, characterized in that an angle iron is fixed to the lower surface of a table top, a rotating shaft is arranged in the angle iron, the angle iron and the table top are rotatably supported by the rotating shaft, a cam block formed with a first cam groove and a second cam groove is arranged in the angle iron, a locking cam is rotatably arranged outside the cam block, the locking cam can be engaged with the first cam groove and the second cam groove, and the cam block is fixed to the rotating shaft in the folding table.

2. The folding table of claim 1,

support shafts are inserted into both ends of the pivot shaft, and leg joints that can be coupled to the leg stays are connected to the support shafts.

3. The folding table of claim 1,

a joint surface that can be joined to the outer peripheral surface of the rotating shaft is formed on one side of the cam block.

4. The folding table of claim 3,

the rotating shaft is formed in a circular tube shape, and the joint surface is formed in a concave curved surface.

5. The folding table of claim 2,

the pivot shaft has a first opening, a first square shaft is provided on one side of the cam block so as to be able to be inserted into the first opening, and a square hole engageable with the first square shaft is formed in the support shaft.

6. The folding table of claim 5,

the peripheral surface of the first square shaft is formed in a tapered shape, and the inner peripheral surface of the square hole is formed in a tapered shape.

7. The folding table of claim 5,

the first square shaft is formed into a quadrangular frustum shape, and the inner space of the square hole is formed into a quadrangular frustum shape.

8. The folding table of claim 5,

the adjacent portion of the square hole of the support shaft is closed.

9. The folding table of claim 1,

a flat supporting surface capable of being jointed with the lower surface of the angle iron is formed on the upper part of the cam block, and when the table top is used, the supporting surface can be jointed with the lower surface of the angle iron.

10. The folding table of claim 9,

and the bearing surface is provided with a screw hole into which an adjusting screw can be screwed.

11. The folding table of claim 5,

a support block is fixed to the rotating shaft at a position facing the cam block.

12. The folding table of claim 11,

a joint surface that can be joined to the outer peripheral surface of the rotating shaft is formed on one side of the support block.

13. The folding table of claim 12,

the joint surface of the support block is formed as a concave curved surface.

14. The folding table of claim 11,

a second opening is formed in the rotating shaft at a position facing the first opening, a second square shaft into which the second opening is insertable is provided to protrude from one side of the support block, and an end of the second square shaft is disposed facing the concave hole in the side circumferential surface of the support shaft.

15. The folding table of claim 14,

a through hole into which a bolt is inserted is formed in the second square shaft, a screw hole into which the bolt is screwed is formed in the first square shaft of the cam block, and the cam block and the support block are fixed to both sides of the support shaft and the rotation shaft.

16. The folding table of claim 11,

a base is formed at the lower part of the support block, a stopper is fixed to the lower surface of the angle iron right above the support block, the side part of the base is configured to be capable of being engaged with the stopper, and the stopper is capable of being engaged with the base when the table top is folded.

17. The folding table of claim 2,

a coupling surface that can be coupled to the circumferential surface of the leg link is formed on one side of the leg joint.

18. The folding table of claim 2,

the fulcrum is integrally formed with the leg joint.

19. The folding table of claim 17,

a plurality of joint pins are provided on the joint surface side of the leg joint, a plurality of bolt insertion holes are opened on the inner peripheral surface of the leg joint, a stepped hole is formed in the inner part of the bolt insertion hole, and a bolt can be screwed into the screw hole of the leg link through the stepped hole.

20. The folding table of claim 2,

the leg joint can be mounted on the outside or inside of the leg strut.

21. The folding table of claim 2,

the upper ends of the front and rear legs disposed below the leg stays are integrated into a single shaft portion, and the shaft portion is attached to the lower end of the leg stay.

Technical Field

The invention relates to a folding table, which can be easily and reasonably manufactured by simplifying the structure, improving the appearance and the safety in use, avoiding complex welding, and can be stably and reliably folded by easily and firmly fixing a cam block and a supporting block on a rotating shaft which rotatably supports a table top and an angle iron.

Background

There is known a folding table in which an angle iron-like lower frame is fixed to both sides of a lower surface of a table top, a joint cover strip is disposed inside the lower frame, a coupling plate is attached to the joint cover strip, an end of a corner tube-like support frame is welded to an inner surface of the coupling plate, an inner support leg is screwed to an outer surface of the coupling plate, outer support legs are disposed outside the support legs at a distance, upper portions of the inner and outer support legs are welded by a corner tube-like coupling pipe, a pivot shaft of a handle and a pivot shaft of a lock link are coupled to an inner side of the joint cover strip so as to be movable together, a tip end of the lock link is disposed so as to be engageable with an engagement groove provided in the upper portion of the coupling plate, and the table top is supported horizontally (see, for example, patent document 1).

However, the folding table has the following problems: since it is necessary to weld the end of the angular pipe-shaped support frame to the inner surface of the gusset plate and weld the upper portions of the inner and outer support legs with the angular pipe-shaped gusset pipe, these welding operations are complicated and troublesome, the assembly and installation of each portion are complicated, and the engagement groove formed in the gusset plate, the engagement portion of the seam cover strip, and a part of the lock link are exposed from the lower frame, which is poor in appearance effect, and in addition, they may be injured by coming into contact with the fingers of the user, and the like.

In order to solve such problems, there is known a folding table in which an angle iron-like lower frame is fixed to a lower surface of a table top, a coupling member made of aluminum die-cast is disposed inside the lower frame, the coupling member is inserted into an inner leg post, a lock plate provided at an end portion of a reinforcing frame is attached to an inner side of the leg post, a lock piece obtained by bending an end edge of the lock plate is locked to the leg post, a connection fitting is welded to an upper portion of the inner and outer leg posts to be coupled, a bracket, a lock link, and an operation lever are disposed in front and rear of the coupling member, a pivot groove and an engagement groove are formed in front and rear of the coupling member, and the bracket is engaged with the pivot groove and the lock link is disposed so as to be engageable with the engagement groove when the table top is used (for example, refer to patent document.

However, the folding table has the following problems: in addition to the complicated manufacturing of the locking plate and the locking piece at the end portion of the reinforcing frame, the welding work of welding the connection fitting to the upper portions of the inner and outer leg stays is required, and the welding work is complicated and troublesome, the assembly and mounting of each portion are complicated, and a part of the bracket is exposed from the lower frame, so that the appearance effect is poor, and there is a possibility that the fingers of the user may be injured by coming into contact therewith, and the like.

Patent document 1: japanese patent laid-open publication No. 2017-86206

Patent document 2: japanese laid-open patent publication No. 2013-144086

Disclosure of Invention

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a folding table which can be easily and rationally manufactured by simplifying a structure, improving an appearance and improving safety in use without complicated welding, and which can stably and reliably fold a table top by easily and firmly fixing a cam block and a support block to a rotating shaft which rotatably supports the table top and an angle bar.

In the invention according to claim 1, there is provided a folding table in which an angle bar is fixed to a lower surface of a table top, a rotating shaft is disposed in the angle bar, the angle bar and the table top are rotatably supported by the rotating shaft, a cam block having first and second cam grooves is disposed in the angle bar, a lock cam is rotatably disposed on an outer side of the cam block, and the lock cam is engageable with the first and second cam grooves, and the cam block is fixed to the rotating shaft, whereby the rotating shaft, the cam block, and the lock cam are compactly disposed in the angle bar, the appearance is improved, and the safety in use is improved.

In the invention according to claim 2, the pivot shaft is inserted into both end portions of the pivot shaft, the leg joint that can be coupled to the leg link is connected to the pivot shaft, both end portions of the pivot shaft are stably supported by the pivot shaft, and the pivot shaft and the leg link can be reasonably and easily connected by the leg joint.

In the invention according to claim 3, a joint surface capable of joining to the outer peripheral surface of the rotating shaft is formed on one side of the cam piece, and the cam piece is tightly and firmly fixed to the rotating shaft.

In the invention according to claim 4, the rotating shaft is formed in a circular tube shape, the engaging surface is formed in a concave curved surface, the rotating shaft is formed of a general-purpose material at low cost and lightweight, and the concave curved surface is engaged with the rotating shaft over a wide range, thereby stably and firmly fixing the cam block.

In the invention according to claim 5, an opening is formed in the rotating shaft, a square shaft into which the opening can be inserted is projected from one side of the cam block, a square hole that can be engaged with the square shaft is formed in the support shaft, and the square shaft is engaged with the square hole through the opening, whereby the support shaft and the cam block are firmly and integrally coupled to each other via the rotating shaft.

In the invention of claim 6, the peripheral surface of the square shaft is formed in a tapered shape, and the inner peripheral surface of the square hole is formed in a tapered shape, so that the square shaft is easily and tightly engaged with the square hole, and can be firmly connected by their wedge effect.

In the invention according to claim 7, the square shaft is formed in a quadrangular frustum shape, and the space inside the square hole is formed in a quadrangular frustum shape, so that the square shaft and the square hole can be simply formed, and the manufacturing can be easily performed.

In the invention according to claim 8, the vicinity of the square hole of the support shaft is sealed, and the strength around the square hole is reinforced to cope with the stress around the square hole generated by the insertion or press-fitting of the support shaft, thereby reliably and stably assembling the support shaft.

In the invention according to claim 9, a flat support surface engageable with the lower surface of the angle iron is formed on the upper portion of the cam block, and when the table top is used, the support surface can be engaged with the lower surface of the angle iron, so that a stable use state of the table top can be obtained.

In the invention according to claim 10, the support surface is provided with a screw hole into which the adjustment screw can be screwed, and when the cam block is aged due to use and the gap between the lower surface of the angle iron and the support surface is enlarged to lower the stable use state of the table top, the adjustment screw is screwed into the support surface to engage the head with the lower surface of the angle iron, so that the gap can be eliminated and the stable use state of the table top can be restored.

In the invention according to claim 11, the support block is fixed to the rotating shaft at a position facing the cam block, and the cam block and the support block are compactly arranged and fixed around the rotating shaft.

In the invention according to claim 12, a joint surface that can be joined to the outer peripheral surface of the rotating shaft is formed on one side of the support block, and the support block is tightly and firmly fixed to the rotating shaft.

In the invention according to claim 13, the engagement surface of the support block is formed as a concave curved surface, and the concave curved surface is engaged with the rotation shaft over a wide range, thereby stably and firmly fixing the support block.

In the invention according to claim 14, an opening is formed in the rotating shaft at a position facing the opening, a square shaft into which the opening can be inserted is provided so as to protrude from one side of the support block, an end of the square shaft is disposed so as to face the concave hole in the side peripheral surface of the support shaft, and the square shaft of the support block is disposed at a position facing the square shaft of the cam block, thereby achieving coaxial disposition and easy and rational fixation of the shafts.

In the invention according to claim 15, a through hole into which a bolt is inserted is formed in the square shaft, a screw hole is formed in the square shaft of the cam block, the bolt is screwed into the screw hole through the through hole, and the cam block and the support block are fixed to both sides of the support shaft and the rotation shaft, thereby fixing them reasonably and easily.

In the invention according to claim 16, a base is formed at a lower portion of the support block, a stopper is fixed to a lower surface of the angle iron directly above the support block, and a side portion of the base is disposed so as to be engageable with the stopper.

In the invention according to claim 17, a coupling surface capable of coupling to the peripheral surface of the leg link is formed on one side of the leg link, and the leg link is attached to the peripheral surface of the leg link in close contact therewith, thereby improving the attachment strength and appearance.

In the invention according to claim 18, the support shaft and the leg joint are integrally formed, and therefore, they can be manufactured reasonably and easily, and the amount of assembly work can be reduced.

In the invention according to claim 19, a plurality of engagement pins are provided so as to protrude from the engagement surface side of the leg joint, a plurality of bolt insertion holes are formed in the inner peripheral surface of the leg joint, stepped holes are formed in the inner portions of the bolt insertion holes, and bolts can be screwed into the screw holes of the leg links through the stepped holes.

In the invention according to claim 20, the leg joint can be attached to the outside or inside of the leg link, and when the leg joint is attached to the outside of the leg link, the attachment work can be easily performed, and when the leg joint is attached to the inside of the leg link, the attachment work can be easily performed, and the space occupied by the leg joint is eliminated, so that the leg joint can be compactly configured.

In the invention according to claim 21, the upper end portions of the front and rear legs disposed below the leg link are integrated into one shaft, and the shaft portion is attached to the lower end portion of the leg link, so that the front and rear legs and the leg link can be coupled compactly.

According to the invention of claim 1, since the cam piece is fixed to the rotating shaft, the cam piece, and the lock cam are compactly arranged in the angle iron, so that they are prevented from being exposed, the appearance is improved, and the safety in use is improved.

According to the invention of claim 2, since the pivot shaft is inserted into both end portions of the pivot shaft and the leg joint that can be coupled to the leg link is coupled to the pivot shaft, both end portions of the pivot shaft are stably supported by the pivot shaft and the leg link can be coupled to the leg link reasonably and easily.

According to the invention of claim 3, since the engaging surface engageable with the outer peripheral surface of the rotating shaft is formed on one side of the cam piece, the cam piece is tightly and firmly fixed to the rotating shaft.

According to the invention of claim 4, since the rotating shaft is formed in the shape of a circular tube and the engaging surface is formed as the concave curved surface, the rotating shaft is formed of a general-purpose material at low cost and with light weight, and the concave curved surface is engaged with the rotating shaft over a wide range, thereby stably and firmly fixing the cam block.

According to the invention of claim 5, since the opening is formed in the rotating shaft, the square shaft capable of being inserted into the opening is projected from one side of the cam block, and the square hole capable of being engaged with the square shaft is formed in the support shaft, the square shaft is engaged with the square hole through the opening, and the support shaft and the cam block are firmly and integrally coupled through the rotating shaft.

According to the invention of claim 6, since the peripheral surface of the square shaft is formed in a tapered shape and the inner peripheral surface of the square hole is formed in a tapered shape, the square shaft is easily and tightly engaged with the square hole and can be firmly connected by their wedge effect.

According to the invention of claim 7, since the square shaft is formed in a quadrangular frustum shape and the space inside the square hole is formed in a quadrangular frustum shape, the square shaft and the square hole can be simply configured and easily manufactured.

According to the invention of claim 8, since the vicinity of the square hole of the support shaft is closed, the strength of the periphery of the square hole is enhanced to cope with the stress of the periphery of the square hole generated by the insertion or press-fitting of the support shaft, and the assembly can be performed reliably and stably.

According to the invention of claim 9, since the flat support surface engageable with the lower surface of the angle iron is formed on the upper portion of the cam block, the support surface can be engaged with the lower surface of the angle iron when the table top is used, and therefore, there is an effect that a stable use state of the table top can be obtained.

According to the invention of claim 10, since the support surface is provided with the screw hole into which the adjustment screw can be screwed, when the cam block is deteriorated due to use and the gap between the lower surface of the angle iron and the support surface is enlarged to lower the stable use state of the table top, the adjustment screw is screwed into the support surface to engage the head with the lower surface of the angle iron, so that the gap can be eliminated and the stable use state of the table top can be restored.

According to the invention of claim 11, since the support block is fixed to the rotating shaft at a position facing the cam block, the cam block and the support block can be compactly arranged and fixed around the rotating shaft.

According to the invention of claim 12, since the joint surface that can be joined to the outer peripheral surface of the rotating shaft is formed on one side of the support block, the support block can be fixed to the rotating shaft tightly and firmly.

According to the invention of claim 13, since the engagement surface of the support block is formed as the concave curved surface, the concave curved surface can be engaged with the rotating shaft over a wide range, and stable and firm fixation can be performed.

According to the invention of claim 14, since the opening is formed at a position of the rotating shaft facing the opening, the square shaft into which the opening can be inserted is provided so as to protrude from one side of the support block, and the end of the square shaft is disposed so as to face the concave hole in the side peripheral surface of the support shaft, the square shaft of the support block can be disposed at a position facing the square shaft of the cam block, and coaxial arrangement and easy and rational fixing of the square shaft and the square shaft can be achieved.

According to the invention of claim 15, since the through hole into which the bolt can be inserted is formed in the square shaft, the screw hole is formed in the square shaft of the cam block, the bolt is screwed into the screw hole through the through hole, and the cam block and the support block are fixed to both sides of the support shaft and the rotation shaft, it is possible to reasonably and easily fix them.

According to the invention of claim 16, since the base is formed at the lower portion of the support block, the stopper is fixed to the lower surface of the angle iron directly above the support block, the side portion of the base is disposed so as to be engageable with the stopper, and the stopper is engageable with the base when the table top is folded, the table top is prevented from being reversed when the table top is folded, and a safe and stable folded state of the table top can be obtained.

According to the invention of claim 17, since the coupling surface that can be coupled to the peripheral surface of the leg link is formed on one side of the leg joint, the leg joint is attached in close contact with the peripheral surface of the leg link, and the attachment strength and the appearance are improved.

According to the invention of claim 18, since the support shaft and the leg joint are integrally formed, it is possible to rationally and easily manufacture them and reduce the amount of assembly work.

According to the invention of claim 19, since the plurality of engagement pins are provided so as to protrude from the engagement surface side of the leg joint, the plurality of bolt insertion holes are opened in the inner peripheral surface of the leg joint, the stepped hole is formed in the inner portion of the bolt insertion hole, and the bolt can be screwed into the screw hole of the leg link through the stepped hole, it is possible to easily perform the attachment without requiring a complicated welding work in attaching the leg joint and the leg link, and it is possible to adjust the attachment positions of the left and right leg links by adjusting the attachment positions of the engagement pins and the bolt.

According to the invention of claim 20, since the leg joint can be attached to the outside or the inside of the leg link, when the leg joint is attached to the outside of the leg link, the attachment work can be easily performed, and when the leg joint is attached to the inside of the leg link, the attachment work can be easily performed, and the space occupied by the leg joint can be eliminated, so that the leg joint can be compactly configured.

According to the invention of claim 21, since the upper end portions of the front and rear legs disposed below the leg link are integrated into one shaft and the shaft portion is attached to the lower end portion of the leg link, the front and rear legs and the leg link can be coupled compactly.

Drawings

Fig. 1 is a perspective view showing a use state of a table top according to an embodiment of the present invention.

Fig. 2 is a front view of fig. 1.

Fig. 3 is a right side view of fig. 1.

Fig. 4 is a perspective view of fig. 3 as viewed from the front.

Fig. 5 is an enlarged sectional view taken along line a-a of fig. 3.

Fig. 6 is a perspective view showing an exploded essential part of the present invention.

Fig. 7 is a perspective view showing a main part of fig. 6 in an exploded and enlarged manner.

Fig. 8 is a sectional view taken along line B-B of fig. 7.

Fig. 9 is a perspective view showing an example of a cam block applied to the present invention.

Fig. 10 is a front view of fig. 9.

Fig. 11 is a top view of fig. 10.

Fig. 12 is a right side view of fig. 10.

Fig. 13 is a sectional view taken along line C-C of fig. 11.

Fig. 14 is a left side view of fig. 10.

Fig. 15 is a sectional view taken along line D-D of fig. 14.

Fig. 16 is a perspective view showing an example of a leg joint applied to the present invention.

Fig. 17 is a perspective view of the leg joint of fig. 16 as viewed from the right side.

Fig. 18 is a front view of fig. 17.

Fig. 19 is a right side view of fig. 17.

Fig. 20 is a sectional view taken along line E-E of fig. 19.

Fig. 21 is a sectional view taken along line F-F of fig. 19.

Fig. 22 is a front view showing a use state of the embodiment of the present invention, illustrating a single-side half.

Fig. 23 is a sectional view taken along line G-G of fig. 22, showing a use condition of the table top.

Fig. 24 is a sectional view taken along line H-H of fig. 22, showing the use of the table top.

Fig. 25 is a front view showing a folded state of the table top according to the embodiment of the present invention, showing the folded state of the table top.

FIG. 26 is a right side view of FIG. 25, illustrating the folded condition of the table top.

Fig. 27 is a sectional view taken along line I-I of fig. 26.

Fig. 28 is a sectional view taken along line J-J of fig. 22.

Fig. 29 is a perspective view showing a main part of another embodiment of the present invention, and a leg joint is attached to the inside of a leg link.

Description of the reference numerals

2, a desktop; 3, angle iron; 6 rotating shaft (central shaft); a 7-leg joint; 8, a fulcrum; 9 a bonding surface; a 10-legged support; 13. 14 a dowel pin; 16 rear legs; 17 a front leg; 21 a first opening portion; 22 a second opening portion; 23 square holes; 24 cam blocks; 25 a first square shaft; 27 a second square shaft; 26 a support block; 28 bolts; 29 bonding surface (concave curved surface); 30 screw holes; 32 a first cam slot; 33 a second cam groove; 34 locking the cam; 37 a bearing surface; 40 screw holes; 41 adjusting screws; 44 bonding surfaces (concave curved surfaces); 47 a through hole; 48 base stations; 49 a stop member; 61. 62 bolt insertion holes; 63. 64 stepped holes.

Detailed Description

The present invention will be described below with reference to an illustrated embodiment, and in fig. 1 to 28, reference numeral 1 denotes a folding table in which a table top 2 is foldable, a pair of angle irons 3 having an inverted U-shaped cross section are attached to the lower surfaces of both sides in the longitudinal direction of the table top 2, side panels 3a having a gentle chevron shape are disposed on both sides thereof, and a curved plate-like cover 4 is attached to the lower end edge of the opening side thereof so as to close the opening.

Through holes 5, 5 having a large diameter are formed at positions facing the side plates 3a of the angle irons 3, and a central shaft 6 of a steel pipe as a rotation shaft is rotatably inserted into the through holes 5, 5. Both ends of the center shaft 6 are disposed along the longitudinal direction of the table top 2, and a support shaft 8 integrally formed with the leg joint 7 is inserted into both ends.

In this case, in the embodiment, the cross-sectional shapes of the central shaft 6 and the support shaft 8 are formed in a circular shape, but they may be formed in a rectangular shape or a polygonal shape, and accordingly, the joint surface between the cam block and the support block described later is formed in a concave curved surface corresponding to the concave polygonal surface.

The leg joint 7 is formed into a substantially thick plate shape by aluminum die casting, and has a flat coupling (japanese expression: joint) surface 9 at its outer end, and the coupling surface 9 is coupled and fixed to the inner surface of the leg stay 10.

The coupling surface 9 is defined by an outer rib 11, a plurality of cylindrical ribs 12 are arranged inside the rib for reinforcement, and coupling pins 13, 14 are projected from upper and lower positions of the rib, and the coupling pins 13, 14 are engageable with pin holes (not shown) on the inner surface of the leg stay 10.

In the figure, 15 is a center shaft support provided at the center of the lower surface of the table top 2, 16 is a rear leg disposed obliquely rearward from the lower end of the leg support 10, 17 is a front leg bent inward from the lower end of the leg support 10 and disposed obliquely downward in the same direction as the leg support 10, and casters 18 and 19 are attached to the lower ends of these legs 16 and 17 so as to be able to travel on the floor 20.

Rectangular first and second openings 21 and 22 are formed in the opposing peripheral surfaces of the central shaft 6 in the angle irons 3 and 3, and a square hole 23 having a truncated pyramid shape is formed at a position corresponding to the support shaft 8 disposed inside the first opening 21, and a first square shaft 25 of a cam block 24 is tightly inserted into the first and second openings 21 and 23.

A recessed hole 45 is formed in the support shaft 8 outside the square hole 23, and a screw hole 8a is formed in a flat surface of the recessed hole 45, into which a bolt described later can be screwed.

On the other hand, the second square shaft 27 of the support block 26 is inserted into the second opening 22, the second square shaft 27 is arranged coaxially with the first square shaft 25, and the cam block 24 and the support block 26 are fixed to both sides of the center shaft 6 by screwing the bolt 28 into the support block 26 from the outside.

The cam block 24 is formed in a plate shape having a long and thick wall by aluminum die casting, and a semi-arc concave curved surface 29 as a joint surface capable of joining to the outer peripheral surface of the center shaft 6 is formed in the lower half portion on the inner side thereof, and the first shaft 25 is provided so as to protrude inside the concave curved surface 29.

The first shaft 25 is formed in a quadrangular pyramid frustum shape engageable with the square hole 23, and a polygonal peripheral surface (angular peripheral surface) thereof is formed in a tapered surface that becomes thinner toward the tip, and a screw hole 30 into which a bolt 28 can be screwed is formed inside thereof.

A substantially roof-shaped protruding cam 31 protrudes from one side surface of the cam block 24, a first cam groove 32 having an inverted V-shape is formed in a lower portion of the protruding cam 31, and a second cam groove 33 having a gentle V-shape is formed in an upper portion of the protruding cam 31.

When the table top 2 is used in a horizontal state, the first cam groove 32 is located at a position where it can be engaged with the mountain portion 35 at the front end of the lock cam 34, so that the horizontal state of the table top 2 can be formed and maintained.

On the other hand, when the table top 2 is rotated to be folded obliquely, the lock cam 34 is rotated outside the cam 31, and the wide and flat front end portion 36 adjacent to the mountain portion 35 is positioned to be engageable with the second cam groove 33, so that the obliquely folded state of the table top 2 can be formed.

A wide support surface 37 is formed at the upper portion of the cam block 24, a recess 38 is formed at the center thereof, a through hole 39 and a screw hole 40 are coaxially formed in the recess 38, an adjusting screw 41 is screwed into the through hole 39 and the screw hole 40, and a head 42 thereof is received in the recess 38.

The support surface 37 is arranged to be engageable with the lower surface of the angle iron 3 when the table top 2 is used in the horizontal state (japanese expression: engagement), and rotation of the table top 2 can be prevented when the ridge portion 35 of the lock cam 34 is engaged with the first cam groove 32.

Further, due to the long-term use of the folding table, a gap is formed between the supporting surface 37 and the lower surface of the angle iron 3, and when their close fit is lowered, the table top 2 is removed, and the adjusting screws 42 are screwed into the through holes 39 and the screw holes 40 from the recesses 38, and the heads 42 thereof are adjusted to be engageable with the lower surface of the angle iron 3, so that the stability of the table top 2 in use can be restored.

The support block 26 is formed by aluminum die-casting into a plate body having a substantially inverted T-shaped cross section, a semicircular arc-shaped support wall 43 is erected at the center thereof, a semicircular arc-shaped concave curved surface 44 is formed as a bonding surface on the inner side of the support wall 43, and the concave curved surface 44 is disposed so as to be bonded to the outer peripheral surface of the central shaft 6.

A concave hole 45 is formed at an intermediate position of the outer periphery of the support wall 43, a gasket 46 is accommodated in the concave hole 45, and a through hole 47 is formed in an end surface of the flat second square shaft 27, the end surface of the second square shaft 27 being disposed to face the concave hole 45 of the support shaft 8.

Then, the bolt 28 is inserted into the through hole 47 from the recessed hole 45, screwed into the screw hole 8a of the recessed hole 45 and the screw hole 30 of the first square shaft 25, and the support block 26 is fixed to the cam block 24 via the center shaft 6.

A rectangular base 48 is provided at a lower end portion of the support block 26, and an inclined tapered surface 48a is formed on an outer peripheral surface of the base 48, and the tapered surface 48a is arranged to be engageable with the stopper 49 when the table top 2 is folded (japanese expression: event).

The stopper 49 is formed in a box shape by synthetic resin, and is screwed to the lower surface of the angle iron 3 directly above the support block 26, and the lower surface of the stopper 49 is configured to be engaged with the tapered surface 48a when the table top 2 is folded.

Therefore, when the table top 2 is folded, the locking cam 34 rotates outside the protruding cam 31, the front end 36 thereof engages with the second cam groove 33 to form the folded state of the table top 2, and the stopper 49 engages with the tapered surface 48a to prevent the table top 2 from rotating, so that the table top 2 can be stably folded.

The lock cam 34 is formed in a substantially elliptical shape by a thick steel plate, and has a chevron-shaped peak portion 35 and a wide tip portion 36 adjacent to the peak portion 35 formed at the tip thereof, and a V-shaped neck portion 50 formed at the adjacent position.

The lock cams 34 are fixed to both end portions of a cam shaft 51 having a substantially vertically long rectangular cross section, and a torsion spring 52 is wound around the circumferential surface of the cam shaft 51, and both end portions of the torsion spring 52 are locked to the lower surface of the angle iron 3 and the circumferential surface of the lock cam 34.

Then, the lock cam 34 is urged by the elasticity of the torsion spring 52 so as to be rotatable about the cam shaft 51 in the direction of the cam 31, and the mountain portion 35 is positioned at a position engageable with the first cam groove 32 when the table top 2 is in use, and the engaging portion 36 is positioned at a position engageable with the second cam groove 33 when the table top 2 is folded.

In the figure, 53 is a shaft tube which is spanned between the right and left angle irons 3, and accommodates therein a cam shaft 51, and a base end portion of an operation lever 54 is fixed to both end portions of the cam shaft 51. The reference numeral 55 denotes a thin, irregular wall formed on the outer surface of the cam 31, and 56 denotes a thin, irregular wall provided inside the cam block 24, which both reduce the number of formed blanks and reduce the weight.

In the figure, reference numeral 57 denotes a coupling (i.e., a joint) member made of synthetic resin and constituting the leg link 10, which is integrally assembled with the leg link 10 by a coupling frame 58, reference numeral 59 denotes a groove formed in the outer peripheral surface of the pivot shaft 8 in the axial direction, reference numeral 60 denotes a substantially semi-cylindrical link cover attached to the upper end of the leg link 10, which is formed in the same shape as the upper end of the leg joint 7 and attached to the side surface of the upper end of the leg link 10, thereby improving the appearance of the above-mentioned portion.

Further, reference numerals 61 and 62 denote bolt insertion holes formed at upper and lower positions of the inner surface of the leg joint 7, stepped holes 63 and 64 opened toward the coupling surface 9 are formed at the inner portions, and bolts (not shown) are inserted into the bolt insertion holes 61 and 62 from the outside so that the screw shafts thereof can be screwed into screw holes (not shown) on the leg links 10 side via the stepped holes 63 and 64.

In the figure, 65 is a thin wall formed on the peripheral surface of the base portion of the support shaft 8, and 66 is a concave wall formed on the end portion of the support shaft 8 and also serving as a thin wall, and the strength of the portion is reinforced.

The folding table configured as described above includes main components such as a pair of right and left angle irons 3, a center shaft 6, a leg joint 7, a support shaft 8, a pair of right and left leg stays 10, a cam block 24, a support block 26, and a lock cam 34, and it is necessary to manufacture them.

The angle 3 is formed by press-molding a steel plate, the cover 4 is formed of a synthetic resin, and a through hole 5 having a large diameter is formed in the center of the side plates 3a, 3a of the angle 3.

The central shaft 6 is obtained by cutting a steel pipe having a predetermined diameter into a predetermined length and forming a first opening 21 and a second opening 22 having rectangular shapes on the opposing circumferential surfaces of the ends thereof.

The leg joint 7 and the support shaft 8 are integrally formed by aluminum die casting, the leg joint 7 is formed in a vertically long thick plate shape, the periphery thereof is divided by a rib 11, the inside is reinforced by a plurality of cylindrical ribs 12, the inner side surface thereof is formed into a flat coupling surface 9, and engaging pins 13, 14 are provided at upper and lower positions of the coupling surface 9 in a protruding manner.

The support shaft 8 is formed in a cylindrical shape into which the center shaft 6 is inserted, a rectangular truncated pyramid-shaped bottomed square hole 23 is formed in the middle portion thereof, a recessed hole 45 is formed in the outer side thereof, and a screw hole 8a is formed in the flat bottom portion of the recessed hole 45.

Since the leg joint 7 and the support shaft 8 are integrally formed in this manner, the operation of separately manufacturing them and connecting them via a connecting fitting or welding is avoided, and the assembly can be easily and quickly performed.

The leg stay 10 is obtained by cutting a square pipe material made of, for example, aluminum or steel into a predetermined length and forming screw holes at the upper and lower positions of the inner surface to be coupled to the leg joint 7, that is, at the opening positions of the stepped holes 63 and 64.

The cam block 24 and the support block 26 are each formed by aluminum die casting, wherein the cam block 24 is formed in a plate shape having a long and thick wall, a semi-arc concave curved surface 29 engageable with the outer peripheral surface of the center shaft 6 is formed in the lower half portion on the inner side thereof, and the first square shaft 25 is formed by providing the first square shaft 25 in a protruding manner on the inner side of the concave curved surface 29.

The first square shaft 25 is formed in a quadrangular pyramid frustum shape engageable with the square hole 23, and a polygonal peripheral surface thereof is formed in a tapered surface shape which becomes thinner toward the tip, and a screw hole 30 into which a bolt 28 can be screwed is formed inside.

A substantially roof-shaped protruding cam 31 is provided to protrude from one side surface of the cam block 24, a first cam groove 32 having an inverted V-shape is formed in a lower portion of the protruding cam 31, and a second cam groove 33 having a gentle V-shape is formed in an upper portion of the protruding cam 31.

A wide support surface 37 is formed at the upper part of the cam block 24, a recess 38 is formed at the center thereof, a through hole 39 and a screw hole 40 are coaxially formed in the recess 38, an adjusting screw 41 can be screwed into the through hole 39 and the screw hole 40, and a head 42 thereof can be accommodated in the recess 38.

The support block 26 is formed into a plate body having a substantially inverted T-shaped cross section by aluminum die casting, a semicircular arc-shaped support wall 43 is erected at the center thereof, a semicircular arc-shaped concave curved surface 44 is formed on the inner side of the support wall 43, and the concave curved surface 44 is formed so as to be engageable with the outer peripheral surface of the central shaft 6.

A concave hole 45 is formed at an intermediate position of the outer periphery of the support wall 43, a washer 46 is accommodated in the concave hole 45, a through hole 47 is formed in an end surface of the flat second square shaft 27, the end surface of the second square shaft 27 is disposed to face the concave hole 8b of the support shaft 8, the bolt 28 is inserted into the through hole 47 from the side of the concave hole 45, and screwed into the screw hole 8a of the concave hole 45 and the screw hole 30 of the first square shaft 25, so that the support block 26 can be fixed to the cam block 24 via the central shaft 6.

A rectangular base 48 is provided at the lower end of the support block 26, and an inclined tapered surface 48a is formed on the outer peripheral surface of the base 48, and the tapered surface 48a is engageable with the stopper 49 when the table top 2 is folded.

The stopper 49 is formed in a box shape by synthetic resin, and is screwed to the lower surface of the angle iron 3 directly above the support block 26, and the lower surface of the stopper 49 is configured to be engaged with the tapered surface 48a when the table top 2 is folded.

The lock cam 34 is formed in a substantially elliptical shape by a thick steel plate, and has a peak portion 35 formed in a peak shape at its tip end and a wide joint portion 36 adjacent to the peak portion 35, and a V-shaped neck portion 50 is formed at a position adjacent to the peak portion.

The lock cams 34 are fixed to both end portions of a cam shaft 51 having a substantially vertically long rectangular cross section, and a torsion spring 52 is wound around the circumferential surface of the cam shaft 51, and both end portions of the spring 52 are locked to the lower surface of the angle iron 3 and the circumferential surface of the lock cam 34.

When the folding table is assembled using the constituent members thus produced, a pair of angle irons 3, a center shaft 6, a leg joint 7, and an integrated support shaft 8, cam block 24, and support block 26 are prepared.

Then, first, both ends of the center shaft 6 are inserted into the through holes 5, 5 of the side plates 3a, 3a of the angle iron 3, the support shafts 8 integrated with the leg joints 7 are inserted into both ends of the center shaft 6, and the positions of the square holes 23 are aligned with the positions of the first openings 21.

Next, the cam block 24 and the support block 26 are disposed outside the first opening 21 and the second opening 22, the concave curved surface 29 of the cam block 24 is joined to the outer peripheral surface of the central shaft 6, the first shaft 25 is inserted into the first opening 21, and the support shaft 8 is inserted into the square hole 23.

At this time, since the pyramid surface of the first square shaft 25 is formed into a tapered shape and the inner peripheral surface of the square hole 23 is also formed into a similar tapered shape, the first square shaft 25 and the square hole 23 are tightly joined and firmly joined by the wedge effect.

On the other hand, since the distal end portion of the support shaft 8 is closed by the concave wall 66, the mechanical strength is enhanced as compared with the case where the distal end portion is open, and the stress when the first square shaft 25 is inserted or press-fitted into the square hole 23 can be sufficiently received.

In this case, in the embodiment, the adjustment screw 41 is not attached to the concave portion 38 of the cam block 24, but the adjustment screw 41 is attached when the gap between the lower surface of the angle bar 3 and the support surface 37 becomes large and the adhesion is reduced due to long-term use. This reduces the trouble of initial assembly.

On the other hand, the concave curved surface 44 of the support block 26 is joined to the outer peripheral surface of the central shaft 6 from the opposite side of the central shaft 6, and the flat second square shaft 27 is inserted into the second opening 22 so that the shaft end portion thereof faces the flat surface of the concave hole 8b of the support shaft 8.

In this state, the washer 46 is accommodated in the recessed hole 45, the bolt 28 is inserted into the through hole 47 from the outside, the screw shaft thereof is inserted into the screw hole 8a, and further screwed into the screw hole 30 of the first shaft 25 to be fastened, and the cam block 24 and the support block 26 are fixed to both sides of the central shaft 6.

In this case, the concave curved surface 44 of the support block 26 is joined to the outer peripheral surface of the central shaft 6, and the concave curved surface 44 of the support block 26 is joined to the outer peripheral surface of the central shaft 6 over a wide range, so that they are stably and accurately brought into close contact with the outer peripheral surface of the central shaft 6.

Then, a shaft tube 53 is bridged between the angle irons 3, the locking cams 34 are attached to both ends of the cam shaft 51 housed inside, and both ends of the torsion spring 52 are locked to the locking cams 34 and the cam shaft 51.

Then, the lock cam 34 is disposed so as to be engageable with the side cam 31 of the cam block 24, the base portion of the operation lever 54 is attached to the outer end portion of the cam shaft 51, and the cam shaft 51 and the operation lever 54 are urged to be rotatable in the same direction.

A stopper 49 is attached to the lower surface of the angle 3 directly above the support block 26, and the lower surface of the stopper 49 is arranged so as to be engageable with the tapered surface 48a on one side of the base 48 of the support block 26.

Then, the cover 4 is locked to the lower end edges of the side plates 3a, 3a of the angle iron 3 to close the opening at the lower part, and the joint surfaces 9 on the outer sides of the leg joints 7 are opposed to the inner side surfaces of the leg stays 10, and the joint pins 13, 14 are joined to pin holes (not shown) on the inner side surfaces of the leg stays 10 to be positioned.

Then, bolts (not shown) are inserted into the bolt insertion holes 61 and 62 from the inside of the leg joint 7, and the screw shafts thereof are screwed into screw holes (not shown) of the inner surface of the leg link 10 through the stepped holes 63 and 64, whereby the leg joint 7 is fixed in close contact with the inner surface of the leg link 10.

Since the leg joint 7 and the leg link 10 can be easily attached by joining the joint pins 13 and 14 and screwing the bolt in this way, the amount of work is reduced as compared with the case of welding them, and the assembling work can be easily and quickly performed.

At this time, the attachment height of the left and right leg stays 10 can be adjusted by adjusting the joining position of the joining pins 13 and 14 and the screwing position of the bolt.

Thereafter, the angle irons 3 are screwed to the lower surfaces of both end portions of the table top 2, the upper end portions of the rear legs 16 and the front legs 17 are mounted to the lower end portions of the leg stays 10, and the casters 17, 18 are mounted to the lower end portions thereof, thereby completing a series of assembly.

At this time, since the upper ends of the rear leg 16 and the front leg 17 are integrally formed and a single upper end thereof is coupled to the lower end of the leg strut 10 (japanese expression: issued), the number of components is reduced, and assembly is facilitated and speeded up.

Therefore, the upper ends of the pair of front and rear leg portions are disposed adjacent to each other, and the work of integrally connecting them via a connecting fitting or by welding is avoided, so that the assembly can be performed easily and quickly.

In the folding table thus assembled, when the table top 2 shown in fig. 1 to 4 is used, as shown in fig. 23 and 24, the mountain-shaped portion 35 of the lock cam 34 engages with the second cam groove 32 of the cam block 24 to form a horizontal posture of the table top 2, and the upper support surface 37 engages with the lower surface of the angle bar 3 to prevent the table top 2 from being reversed, thereby maintaining the stable horizontal posture of the table top 2.

Therefore, the use state based on the stable horizontal posture of the tabletop 2 can be obtained thereafter.

The operating lever 54 is held so that the tip end portion thereof is turned upward according to the use condition of the tabletop 2.

Then, the lock cam 34 rotates counterclockwise in fig. 23 about the cam shaft 51 against the elasticity of the torsion spring 52, and the mountain portion 35 thereof retreats from the engagement position of the first cam groove 32 and separates.

Therefore, the operating lever 54 is released when the table top 2 is rotated by approximately 80 ° counterclockwise in fig. 23 and 24 while holding the rear end of the table top 2 and pushing up around the support shaft 8 while keeping the rotational state of the operating lever 54.

Then, the lock cam 34 rotates outside the cam 31 of the cam block 24, and the engaging portion 36 thereof engages with the second cam groove 33, thereby forming the folded state of the table top 2.

At this time, the stopper 49 fixed to the inner surface of the angle bar 3 moves in conjunction with the folding displacement of the table top 2, and the lower surface thereof engages with the tapered surface 48a of the base 48 of the support block 26.

Thus, the table top 2 is prevented from rotating in the folding direction, and the engagement of the engaging portions 36 and the second cam grooves 33 is combined, so that the table top 2 is stably folded. This condition is shown in fig. 25 to 28.

Therefore, the table top 2 can be moved to an appropriate position on the floor 20 while keeping a stable folded state.

Fig. 29 shows another embodiment of the present invention, and the same components as those in the above embodiment are denoted by the same reference numerals.

In the present embodiment, instead of attaching the leg joint 7 to the outside of the leg link 10, the leg joint 7 is formed into a quadrangular prism shape that can be housed in the leg link 10, and complicated side surface shapes and engagement pins 13 and 14 are omitted, so that the structure is simplified, and the leg joint 7 is inserted into the leg link 10 and screwed from the outside of the leg link 10, thereby realizing easy formation of the leg joint 7 and rationalization of assembling the leg joint to the leg link 10.

Industrial applicability

Thus, the folding table of the present invention can be easily and rationally manufactured by simplifying the structure, improving the appearance and the safety in use without complicated welding, and the cam block and the support block are easily and firmly fixed to the rotating shaft rotatably supporting the table top and the angle iron, so that the folding operation of the table top can be stably and reliably performed.