Buffer device of wheelchair headrest
阅读说明：本技术 一种轮椅头靠的缓冲装置 (Buffer device of wheelchair headrest ) 是由 杨博弈 吴添贵 于 2019-10-30 设计创作，主要内容包括：本发明提供了一种轮椅头靠的缓冲装置,设于水平横杆上,包括第一缓冲结构,所述第一缓冲结构包括一上支撑座、一下支撑座、至少一摆动板和一阻尼件,所述水平横杆固接于上支撑座的顶部所述水平横杆(1)和下支撑座(215)之间通过一滑移机构(21)可前后相对移动；所述摆动板(22)的上下两端分别铰接于水平横杆(1)和下支撑座(215)相对的一侧；所述阻尼件的一端与摆动板的下端铰接,另一端铰接于下支撑座；当头抵靠在头靠上时,水平横杆会受一水平向后的作用力,驱动摆动板向后运动,同时摆动板压缩底部的阻尼件,实现头靠的缓冲。(The invention provides a buffer device of a wheelchair headrest, which is arranged on a horizontal cross rod and comprises a first buffer structure, wherein the first buffer structure comprises an upper supporting seat, a lower supporting seat, at least one swinging plate and a damping part, and the horizontal cross rod is fixedly connected to the top of the upper supporting seat, and the horizontal cross rod (1) and the lower supporting seat (215) can move back and forth relatively through a sliding mechanism (21); the upper end and the lower end of the swinging plate (22) are respectively hinged to one side of the horizontal cross rod (1) opposite to the lower support seat (215); one end of the damping piece is hinged with the lower end of the swinging plate, and the other end of the damping piece is hinged with the lower supporting seat; when the head leans against the headrest, the horizontal cross rod can receive a horizontal backward acting force to drive the swinging plate to move backwards, and meanwhile, the swinging plate compresses the damping piece at the bottom to realize the buffering of the headrest.)
1. The utility model provides a buffer (100) of wheelchair headrest, locates on horizontal pole (1), its characterized in that: the damping device comprises a first buffering structure (2), wherein the first buffering structure (2) comprises a lower supporting seat (215), at least one swinging plate (22) and a damping piece (23), and the horizontal cross rod (1) and the lower supporting seat (215) can move back and forth relatively through a sliding mechanism (21); the upper end and the lower end of the swinging plate (22) are respectively hinged to one side of the horizontal cross rod (1) opposite to the lower support seat (215); one end of the damping piece (23) is hinged with the lower end of the swinging plate (22), and the other end is hinged with the lower supporting seat (215).
2. A cushioning device (100) of a wheelchair headrest according to claim 1, characterized in that: the first cushioning structure (2) further comprises a locking mechanism (24), the locking mechanism (24) is positioned below the swing plate (22), and the locking mechanism (24) comprises a first knob (241) and a rotating shaft (242); the first knob (241) is fixedly connected to the head of the rotating shaft (242), and the rotating shaft (242) can be driven to rotate by the first knob (241); the rotating shaft (242) is rotatably fixed at the bottom in the lower supporting seat (215), and the middle part of the rotating shaft (242) is provided with a notch part (a); when the swing plate is in a locked state, the lower end of the swing plate (22) abuts against the outer circumferential surface of the rotating shaft (242), and when the swing plate is in an unlocked state, the notch (a) of the rotating shaft (242) is arranged towards the lower end of the swing plate (22).
3. A cushioning device (100) of a wheelchair headrest according to claim 2, characterized in that: the locking mechanism (24) further comprises a first spring (243), and the tail part of the rotating shaft (242) is provided with a first annular groove; the first spring (243) is sleeved on the first annular groove and clamped inside the lower support seat (215); the first knob (241) is positioned outside the lower support seat (215), and two opposite sides of the lower end surface of the first knob (241) are provided with a first upper positioning column (2411) and a first lower positioning column (2412); a first groove group (211) and a first sliding groove (212) are respectively arranged on the lower supporting seat (215) corresponding to the first upper positioning column (2411) and the first lower positioning column (2412), and the first groove group (211) comprises three first grooves (2111) which are sequentially arranged along the circumference; the first upper positioning column (2411) is inserted into the first groove (2111); the first lower positioning column (2412) is inserted into the first sliding groove (212) and can be arranged along the first sliding groove (212) in a sliding manner.
4. A buffer device (100) of a wheelchair headrest as claimed in claim 3 wherein: the middle one of the first grooves (2111) is an elongated slot (211k), and the first lower positioning column (2412) can be slidably arranged along the elongated slot (211 k).
5. A cushioning device (100) of a wheelchair headrest according to claim 1, characterized in that: the device also comprises an upper supporting seat (214), wherein the upper supporting seat (214) and the lower supporting seat (215) can move back and forth relatively through the sliding mechanism (21); the horizontal cross rod (1) is fixedly connected to the upper supporting seat (214); the upper end and the lower end of the swinging plate (22) are respectively hinged on one side opposite to the upper support seat (214) and the lower support seat (215).
6. A cushioning device (100) of a wheelchair headrest according to claim 5, characterized in that: the number of the swing plates (22) is two, and the two swing plates (22) are arranged in parallel in the front and back direction and are respectively hinged with the upper supporting seat (214)) and the lower supporting seat (215).
7. A cushioning device (100) of a wheelchair headrest according to claim 5, characterized in that: the sliding mechanism (21) comprises two pairs of connecting plates (216), each pair of connecting plates (216) are correspondingly arranged in the front and the back of the upper supporting seat (214) and the lower supporting seat (215), and the upper end and the lower end of each connecting plate (216) are hinged with the upper supporting seat (214) and the lower supporting seat (215) respectively.
8. A cushioning device (100) of a wheelchair headrest according to claim 5, characterized in that: the top of the upper supporting seat (214) is provided with a cavity (213), the horizontal cross rod (1) is arranged in the cavity (213), and a plurality of positioning holes (11) are axially arranged on the upper surface of the horizontal cross rod (1) at intervals; the first buffer structure (2) further comprises a positioning mechanism (25), and the positioning mechanism (25) comprises a cover (251), a second knob (252) and a positioning pin (253); the cover (251) is fixedly connected to the top of the upper supporting seat (214) and covers the cavity (213), and the top end of the cover (251) is provided with a containing part (2511) matched with the second knob (252); the second knob (252) is placed in the accommodating portion (2511), and the positioning pin (253) sequentially penetrates through the second knob (252) and the sealing cover (251) from top to bottom and is inserted into a positioning hole (11) of the horizontal cross rod (1).
9. The cushioning device (100) of a wheelchair headrest as claimed in claim 8, characterized in that: the positioning mechanism (25) further comprises a second spring (254) and a clamping ring (255), a second annular groove (2531) is formed in the lower portion of the positioning pin (253), and the clamping ring (255) is arranged on the horizontal cross rod (1) and sleeved in the second annular groove (2531); the lower surface of the cover (251) is provided with a concave part (2513), and the second spring (254) is sleeved on the positioning pin (253) and clamped between the concave part (2513) and the clamping ring (255); two opposite sides of the lower end surface of the second knob (252) are provided with a second upper positioning column (2521) and a second lower positioning column (2522); the accommodating portion (2511) is provided with a second groove group (J) and a second sliding groove (g) corresponding to the second upper positioning column (2521) and the second lower positioning column (2522), the second groove group (J) comprises at least two second grooves (J1) sequentially arranged along the circumference, the second upper positioning column (2521) is inserted into a second groove (J1), and the second lower positioning column (2522) is inserted into the second sliding groove (g) and can be slidably arranged along the second sliding groove (g).
10. A buffer device (100) of a wheelchair headrest as claimed in claim 9 wherein: the number of the second grooves (J1) is three, and the second upper positioning column (2521) is inserted into one of the three second grooves (J1); of the three second grooves (J1), the depth of the second groove (J1) in the middle is greater than the depths of the other two second grooves (J1).
11. A buffer device (100) of a wheelchair headrest as claimed in claim 9 wherein: a guide groove (2523) is arranged on the lower end surface of the second knob (252) adjacent to the second lower positioning column (2522), a guide pillar (2512) is arranged in the accommodating part (2511) corresponding to the guide groove (2523), and the guide pillar (2512) is inserted into the guide groove (2523) and can be arranged in a sliding manner along the guide groove (2523).
12. A cushioning device (100) of a wheelchair headrest according to claim 1, characterized in that: the sliding mechanism (21) comprises two pairs of connecting plates (216), each pair of connecting plates (216) are correspondingly arranged in front of and behind the horizontal cross rod (1) and the lower supporting seat (215), and the upper end and the lower end of each connecting plate (216) are hinged with the horizontal cross rod (1) and the lower supporting seat (215) respectively.
13. A cushioning device (100) of a wheelchair headrest as claimed in claim 12 wherein: the number of the swing plates (22) is two, and the two swing plates (22) are arranged in parallel front and back and are respectively hinged with the horizontal cross rod (1) and the lower supporting seat (215).
14. A cushioning device (100) of a wheelchair headrest according to claim 1, characterized in that: the damping piece (23) is a damping cylinder or a gas spring or a spring.
15. A cushioning device (100) of a wheelchair headrest according to any one of claims 1 to 13, characterized in that: the backrest plate is characterized by further comprising a backrest plate (3) and a second buffering structure (4), wherein the second buffering structure (4) comprises a fixed frame (41), a connecting piece (42), two guide rods (43) and two linear bearings (44); the fixing frame (41) is fixedly connected to the back surface of the headrest backboard (3), and the fixing frame (41) is provided with two parallel transverse edges (411); the connecting piece (42) is respectively fixedly connected with the horizontal cross rod (1) and the two linear bearings (44) and is arranged in a linkage manner; each linear bearing (44) can be sleeved on a guide rod (43) in a vertically moving manner; each guide rod (43) is fixed between two transverse edges (411), an elastic part (45) is sleeved on the upper part and the lower part of each guide rod (43) respectively, and the elastic part (45) is clamped between the linear bearing (44) and one transverse edge (411).
16. A buffer device (100) of a wheelchair headrest as claimed in claim 14 wherein: the second buffer structure (4) further comprises at least one clamp (46), wherein the clamp (46) clamps the upper part or the lower part of the two guide rods (43) and is arranged between the linear bearing (44) and one transverse edge (411).
17. A cushioning device (100) of a wheelchair headrest according to claim 15, characterized in that: the number of the clips (46) is two, and the two clips (46) respectively clip the upper part and the lower part of the two guide rods (43).
18. A buffer device (100) of a wheelchair headrest as claimed in claim 14 wherein: the back of the headrest back plate (3) is provided with an accommodating cavity (31), and the fixing frame (41) is fixedly connected in the accommodating cavity (31); the connecting piece (42) is provided with a connecting head (421) and a swinging head (422), the connecting head (421) is provided with a horizontally arranged object placing groove (423), one end of the horizontal cross rod (1) is inserted into the object placing groove (423) and is fixedly connected with the connecting head (421) through a positioning piece (47); the two linear bearings (44) are arranged on the swinging head (422) in a penetrating way and are arranged in an interference fit way with the swinging head (422).
Technical Field
The invention relates to the technical field of wheelchair headrests, in particular to a buffer device of a wheelchair headrest.
Background
The head rest of the traditional wheelchair is provided with a cushion body made of shock-absorbing materials such as high-density foaming sponge or foam on the part contacted with the head of a human body, so that the external impact force can be reduced and dispersed, the aims of protecting the head of a user and reducing injury are fulfilled, but the cushion body can be deformed in a small range generally to transmit and absorb the impact force, and the impact force cannot be sufficiently and effectively dispersed and absorbed only by the cushion body when the impact force is large.
Chinese patent application (application No. 201220489177.9, applicant's 2012.09.24) discloses a wheelchair headrest 10 ' with a buffering function, as shown in fig. 1-2, comprising a headrest body 1 ', a horizontal cross-bar 13 ', hack-bars 2 ' supporting the headrest body, and two damping pieces 3 ', said headrest body 1 ' being composed of a cushion body 11 ' and a back plate 12 ' fixing the cushion body; the top of the hack lever 2 'is provided with a bearing 21' matched with the horizontal cross bar 13 ', the middle part of the bearing 21' forms a through chute 211 'which is penetrated back and forth, the horizontal cross bar 13' is sleeved in the chute 211 'and can move back and forth along the chute 211' in a telescopic manner, two parallel and symmetrical guide rails 22 'are arranged on two sides of the bearing 21', and each guide rail 22 'is provided with a guide groove 221' with an open top; the two damping pieces 3 ' are symmetrically arranged between the headrest body 1 ' and the hack lever 2 ', one end of each damping piece is acted on the headrest body 1 ', the other end of each damping piece is acted on the hack lever 2 ', each damping piece 3 ' is a damping cylinder, one end of each damping cylinder is locked on the horizontal cross rod 13 ', the other end of each damping cylinder is connected to the guide rail 22 ' through the locking rod 4 ', and the front end of each locking rod 4 ' extends into the guide groove 221 '. During use, the locking rods 4 ' are loosened, the damping cylinders are loosened, the horizontal cross rods 13 ' can move back and forth along the hack-rod sliding grooves 211 ', the distance between the headrest body 1 ' and the hack rods 2 ' is adjusted to adapt to different requirements of a user, the locking rods 4 ' are locked after the distance is determined, the damping cylinders are locked on the guide rails 22 ', the headrest body 2 ' has a buffering effect under the action of the two damping cylinders 3 ', the impact force can be dispersed to a certain extent, however, the buffering effect is not ideal, and the effect of protecting and reducing injury is limited.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, the technical problems in the above-described techniques. To this end, an object of the present invention is to propose a cushioning device for a wheelchair headrest.
In order to achieve the above objects, a first aspect of the present invention provides a buffering device for a wheelchair headrest, which is disposed on a horizontal cross bar, and includes a first buffering structure, where the first buffering structure includes an upper supporting seat, a lower supporting seat, at least one swinging plate, and a damping member, and the horizontal cross bar is fixedly connected to the top of the upper supporting seat, and the horizontal cross bar and the lower supporting seat can move back and forth relatively through a sliding mechanism; the upper end and the lower end of the swinging plate are respectively hinged to one side of the horizontal cross rod opposite to the lower supporting seat; one end of the damping piece is hinged with the lower end of the swinging plate, and the other end of the damping piece is hinged with the lower supporting seat.
Based on the design, when the head leans against the headrest, the horizontal cross rod can be driven by a horizontal backward acting force to drive the swinging plate to move backwards, and meanwhile, the swinging plate compresses the damping piece at the bottom to realize the buffering of the headrest.
In addition, the cushioning device for the headrest of the wheelchair provided by the embodiment of the invention can also have the following additional technical characteristics:
the first buffer structure also comprises a locking mechanism, the locking mechanism is positioned below the swinging plate, and the locking mechanism comprises a first knob and a rotating shaft; the first knob is fixedly connected to the head of the rotating shaft and can drive the rotating shaft to rotate; the rotating shaft is rotatably fixed at the bottom in the lower supporting seat, and the middle part of the rotating shaft is provided with a notch part; when the swing plate is in a locked state, the lower end of the swing plate is abutted against the outer circumferential surface of the rotating shaft, and when the swing plate is in an unlocked state, the notch part of the rotating shaft is arranged towards the lower end of the swing plate; the locking mechanism is used for controlling the opening and closing of the headrest buffering function.
The locking mechanism also comprises a first spring, and the tail part of the rotating shaft is provided with a first annular groove; the first spring is sleeved on the first annular groove and clamped in the lower supporting seat;
the first knob is positioned outside the lower supporting seat, and two opposite sides of the lower end face of the first knob are provided with a first upper positioning column and a first lower positioning column; a first groove group and a first sliding chute are respectively arranged on the lower supporting seat corresponding to the first upper positioning column and the first lower positioning column, and the first groove group comprises three first grooves which are sequentially arranged along the circumference; the first upper positioning column is inserted into the first groove; the first lower positioning column is inserted into the first sliding groove and can be arranged along the first sliding groove in a sliding mode; when the damper function is to be turned on or off, the notch portion or the outer circumferential surface of the rotation shaft may be directed toward the swing plate.
The middle of the first groove is a long groove, and the first lower positioning column can be arranged along the long groove in a sliding mode; the first lower positioning column slides in the long groove and can finely adjust the part of the rotating shaft facing the swinging plate.
The upper support seat and the lower support seat can move back and forth relatively through the sliding mechanism; the horizontal cross rod is fixedly connected to the upper support seat; the upper end and the lower end of the swinging plate are respectively hinged to one side of the upper supporting seat opposite to the lower supporting seat;
the number of the swing plates is two, the two swing plates are arranged in parallel in the front and at the back and are respectively hinged with the upper supporting seat and the lower supporting seat, so that the swing plate is more stable during swinging.
The sliding mechanism comprises two pairs of connecting plates, each pair of connecting plates is respectively and correspondingly arranged in front of and behind the upper supporting seat and the lower supporting seat, and the lower and upper ends of each connecting plate are respectively hinged with the upper supporting seat and the lower supporting seat; the orthographic projection surface of the shell formed by combining the upper supporting seat, the lower supporting seat and the two pairs of connecting plates is of a parallel four-bar structure, so that the shell is more stable during swinging.
The top of the upper supporting seat is provided with a cavity, the horizontal cross rod is arranged in the cavity, and a plurality of positioning holes are axially arranged on the upper surface of the horizontal cross rod at intervals;
the first buffer structure also comprises a positioning mechanism, and the positioning mechanism comprises a sealing cover, a second knob and a positioning pin; the sealing cover is fixedly connected to the top of the upper supporting seat and covers the cavity, and the top end of the sealing cover is provided with a containing part matched with the second knob; the second knob is placed in the holding portion, the locating pin passes second knob and closing cap from last to down in proper order to in inserting horizontal pole's a locating hole, so design can fix horizontal pole at last support top, realizes that horizontal pole and last support interlock set up.
The positioning mechanism further comprises a second spring and a clamping ring, a second annular groove is formed in the lower portion of the positioning pin, and the clamping ring is arranged on the horizontal cross rod and sleeved in the second annular groove; the lower surface of the sealing cover is provided with a concave part, and the second spring is sleeved on the positioning pin and clamped between the concave part and the clamping ring; two opposite sides of the lower end face of the second knob are provided with a second upper positioning column and a second lower positioning column; a second groove group and a second sliding groove are respectively arranged at the accommodating part corresponding to the second upper positioning column and the second lower positioning column, the second groove group comprises at least two second grooves which are sequentially arranged along the circumference, the second upper positioning column is inserted into one second groove, and the second lower positioning column is inserted into the second sliding groove and can be arranged along the second sliding groove in a sliding manner; so set up, can adjust the position of horizontal pole to the people that the adaptation height is different.
The number of the second grooves is three, and the second upper positioning columns are inserted into one of the three second grooves; and in the third second groove, the depth of the second groove in the middle is greater than the depths of the other two second grooves. When the second upper positioning column is inserted into the middle second groove, the horizontal cross rod is in a locking state, and the middle second groove is deeper in depth and can be positioned more firmly.
A guide groove is formed in the lower end face of the second knob, which is close to the second lower positioning column, a guide column is arranged in the accommodating part, which corresponds to the guide groove, and the guide column is inserted into the guide groove and can be arranged along the guide groove in a sliding manner; when the second knob is rotated under the resilience force of the second spring, the guiding and positioning functions are achieved.
The sliding mechanism comprises two pairs of connecting plates, each pair of connecting plates are respectively and correspondingly arranged in front of and behind the horizontal cross rod and the lower supporting seat, and the upper end and the lower end of each connecting plate are respectively hinged with the horizontal cross rod and the lower supporting seat.
The number of the swing plates is two, the two swing plates are arranged in parallel in the front and at the back and are respectively hinged with the horizontal cross rod and the lower supporting seat.
The damping piece is a damping cylinder or a gas spring or a spring.
The back board and the second buffer structure, the second buffer structure includes a fixed mount, a connecting piece, two guide rods and two linear bearings; the fixing frame is fixedly connected to the back of the headrest back plate and is provided with two parallel transverse edges; the connecting piece is respectively fixedly connected with the horizontal cross rod and the two linear bearings and is arranged in a linkage manner; each linear bearing can be sleeved on a guide rod in a vertically moving manner; each guide rod is fixed between the two transverse edges, the upper part and the lower part of each guide rod are respectively sleeved with an elastic part, and the elastic parts are clamped between the linear bearings and the transverse edges. The horizontal cross rod can receive a forward acting force along with the fluctuation and the forward and backward swing of the upper supporting seat, so that the connecting piece and the two linear bearings are driven to compress the elastic part up and down, and the head rest is further buffered.
The second buffer structure also comprises at least one clamp, the clamp clamps the upper part or the lower part of the two guide rods and is arranged between the linear bearing and the transverse edge, and the clamp can close the buffer effect of the head back board.
The number of the clamps is two, and the two clamps clamp the upper parts and the lower parts of the two guide rods respectively.
The back of the headrest back plate is provided with an accommodating cavity, and the fixing frame is fixedly connected in the accommodating cavity; the connecting piece is provided with a connecting head and a swinging head, the connecting head is provided with a horizontally arranged object placing groove, one end of the horizontal cross rod is inserted into the object placing groove and is fixedly connected with the connecting head through a positioning piece; and the two linear bearings are arranged on the swinging head in a penetrating way and are arranged in an interference fit way with the swinging head.
Drawings
Fig. 1 is an exploded view of a headrest of a wheelchair having a buffering function in the related art.
Fig. 2 is a schematic structural view of a conventional wheelchair headrest having a buffering function.
FIG. 3 is an exploded view of a cushion device of a headrest of a wheelchair according to the present invention.
FIG. 4 is a schematic view showing a normal state of a cushioning device of a headrest of a wheelchair according to the present invention.
FIG. 5 is a schematic view showing a compressed state of a buffering means of a headrest of a wheelchair according to the present invention.
FIG. 6 is a cross-sectional view of a buffering means of a headrest of a wheelchair according to the present invention.
FIG. 7 is a view showing the engagement of the locking mechanism with the swing plate in the present invention.
Fig. 8 is a schematic structural diagram of the first knob according to the present invention.
Fig. 9 is a schematic structural diagram of the first knob according to the present invention.
Fig. 10 is a schematic structural view of a second knob according to the present invention.
Fig. 11 is a schematic structural view of the closure of the present invention.
Fig. 12 is an exploded view of a second cushioning structure according to the present invention.
Fig. 13 is an orthographic view of a second buffer structure according to the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Aiming at the problem that the headrest body 2 'only depends on the telescopic action of the damping cylinder 3' to play a buffering role in the prior art, the parallel four-bar linkage structure (composed of an upper supporting
In order to better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
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