Armrest structure applied to folding wheelchair

Abstract

An armrest structure applied to a folding wheelchair comprises a mounting seat, a rotating seat and an armrest assembly mounted on the rotating seat, a supporting shaft is arranged on the mounting seat, two opposite end faces of the supporting shaft are provided with a locking groove and a resetting groove respectively, the locking groove is communicated with the resetting groove through a first axial through hole, and a fixed fluted disc is arranged on the groove end face of the locking groove; a rotating groove is formed in one end face of the rotating base, one end of the supporting shaft is supported in the rotating groove in a matched mode, a rotating fluted disc movably arranged in the locking groove is fixedly arranged in the rotating groove, and the rotating fluted disc moves in the axial direction of the supporting shaft based on the rotating base to be meshed with and separated from the fixed fluted disc. The rotating seat is fixedly connected with a reset shaft located in the rotating groove, and one end of the reset shaft penetrates through the first axial through hole, then enters the reset groove and is provided with a limiting head. According to the utility model, the supporting shaft provides a supporting effect for the rotating seat, so that the probability of bending deformation of the reset shaft is reduced, and the reset shaft stably and axially moves to realize the locking and unlocking of the angle of the armrest assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of wheelchairs, and particularly relates to an armrest structure applied to a folding wheelchair. Background Art

[0002] The applicant previously disclosed an armrest connection structure applied to a portable folding wheelchair with the patent number 201920704196.0, which includes a seat and armrests. An armrest connection part is provided on the seat, and an armrest installation component is installed on each of the two armrest connection parts. The armrest installation component includes an armrest connecting rod installed on the armrest connection part, an armrest receiving part connected to the armrest connecting rod, an armrest installation part for connecting the armrest, and an angle adjustment mechanism; the angle adjustment mechanism includes an angle adjustment shaft, a tension return spring, an adjustment sleeve I provided on the armrest connecting rod, and an adjustment sleeve II provided on the armrest receiving part. The adjustment sleeve I includes a movable cavity I and a positioning port I communicating with the movable cavity I. The adjustment sleeve II includes a movable cavity II and a positioning port II; the angle adjustment shaft is inserted into the movable cavity I, the positioning port I, the positioning port II, and the movable cavity II. Limit heads I and II for restricting the moving stroke of the angle adjustment shaft are respectively provided at both ends of the angle adjustment shaft, and the limit heads I and II are respectively located in the movable cavity I and the movable cavity II; the tension return spring is arranged in the movable cavity I and cooperates with the limit head II to restrict the longitudinal movement of the angle adjustment shaft. A hexagonal chuck is provided on the angle adjustment shaft. When the hexagonal chuck is fitted in the positioning port I and the positioning port II, the angle of the armrest is locked.

[0003] Although the above technical solution can lock the angle of the armrest by using the function of the angle adjustment shaft, in the technical solution, only the angle adjustment shaft is used to connect between the adjustment sleeve I and the adjustment sleeve II, and there is no other matching support structure between the adjustment sleeve I and the adjustment sleeve II; when the armrest is stressed, the acting force of the armrest is completely borne by the angle adjustment shaft. After long-term use, it is easy to cause the angle adjustment shaft to deform and bend, affecting the longitudinal movement of the angle adjustment shaft, resulting in that the angle adjustment shaft cannot drive the hexagonal chuck to fit in the positioning port I and the positioning port II to lock the angle of the armrest, or causing the hexagonal chuck to disengage from the positioning port I and the positioning port II to unlock the angle of the armrest, thus making it difficult to use the armrest angle adjustment function normally. Summary of the Utility Model

[0004] In order to overcome the deficiencies of the prior art, the utility model provides an armrest structure applied to a folding wheelchair.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] An armrest structure applied to a folding wheelchair, comprising a mounting seat, a rotating seat and an armrest assembly mounted on the rotating seat, characterized in that: a support shaft is provided on the mounting seat, locking grooves and reset grooves are respectively provided on opposite end faces of the support shaft, and the locking groove and the reset groove are communicated through a first axial through hole, and a fixed tooth disc is provided on the groove end face of the locking groove;

[0007] A rotating groove is provided on one end face of the rotating seat, and one end of the support shaft provided with the locking groove is supported in the rotating groove in a matching manner, and the rotating seat can axially move along the support shaft and can rotate with the support shaft as a rotation axis;

[0008] A rotating tooth disc that moves in the locking groove is fixedly provided in the rotating groove, and the rotating tooth disc meshes with and separates from the fixed tooth disc based on the axial movement of the rotating seat along the support shaft;

[0009] The rotating seat is fixedly connected with a reset shaft located in the rotating groove. One end of the reset shaft passes through the first axial through hole and enters the reset groove and is provided with a limit head; a meshing compression spring for driving the rotating tooth disc to keep meshing with the fixed tooth disc is provided in the reset groove, and two ends of the meshing compression spring respectively abut against the end face of the limit head and the groove end face of the reset groove.

[0010] In the present utility model, a rotating round shaft is integrally formed with a convex portion on the groove end face of the rotating groove, the rotating tooth disc is integrally formed on the end face of the rotating round shaft, and the outer circumferential surface of the rotating round shaft is slidably matched with the circumferential groove wall of the locking groove.

[0011] In the present utility model, a receiving groove is provided on the other end face of the rotating seat, a second axial through hole penetrating the rotating round shaft is provided on the groove end face of the receiving groove, and the other end of the reset shaft extends into the receiving groove from the second axial through hole and is connected with a limiting member, and the limiting member is slidably matched with the groove end face of the receiving groove.

[0012] In the present utility model, the opening of the receiving groove is closed by a cover.

[0013] In the present utility model, the support shaft and the mounting seat are integrally formed by machining.

[0014] In the present utility model, the mounting seat is vertically arranged, the axial direction of the support shaft is horizontally arranged in the left-right direction, and two shaft part reinforcing ribs are integrally formed at the rear end of the mounting seat, and the two shaft part reinforcing ribs are integrally formed and connected to the upper part and the lower part of the support shaft respectively.

[0015] In the present utility model, a connecting rod fitting groove extending through the mounting seat from top to bottom is provided on the mounting seat, and the connecting rod fitting groove is used for inserting and matching with an armrest connecting part on a wheelchair seat.

[0016] In the present utility model, the top view cross-sectional shape of the connecting rod fitting groove is a D shape.

[0017] In the present utility model, the armrest assembly includes a support rod and an armrest pad provided on the support rod.

[0018] In the present utility model, the cross-sectional shape of the support rod is a D shape. A connecting portion is provided on the rotating seat. A first D-shaped fitting groove having the same cross-sectional shape as that of the support rod is provided on the end surface of the connecting portion away from the rotating seat. A second D-shaped fitting groove having the same cross-sectional shape as that of the support rod is provided on the armrest pad. The rear end of the support rod is fitted and installed in the first D-shaped fitting groove, and the front end is fitted and installed in the second D-shaped fitting groove.

[0019] The beneficial effects of the present utility model are as follows: A support shaft is provided on the mounting seat in the present utility model. The support shaft is used to cooperate with and support in the rotating groove of the rotating seat, so that the rotating seat is rotatably sleeved on the support shaft. In this way, the support shaft provides a supporting effect for the rotating seat, thereby reducing or even eliminating the acting force generated by the reset bearing when the armrest assembly is stressed, reducing the probability of bending deformation of the reset shaft, and enabling the reset shaft to stably move axially to lock and unlock the angle of the armrest assembly. In addition, the outer circumferential surface of the rotating circular shaft is in sliding fit with the circumferential groove wall of the locking groove, so that the rotating circular shaft provides a certain supporting force for the rotating seat, further improving the stability of the rotating seat on the support shaft, and thus further reducing the probability of bending deformation of the reset shaft. Description of the Drawings

[0020] The present utility model will be further described below in conjunction with the drawings and embodiments:

[0021] Figure 1 is the three-dimensional view of this embodiment;

[0022] Figure 2 is the left view of this embodiment;

[0023] Figure 3 is Figure 2 the cross-sectional view taken along A-A in

[0024] Figure 4 is the structural schematic diagram of the fixed gear disk and the rotating gear disk;

[0025] Figure 5 is the cooperation schematic diagram of the limiting member and the hexagonal boss;

[0026] Figure 6 is the cross-sectional view of the armrest assembly. Detailed Embodiments

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model.

[0028] Referring to Figures 1-6 , an armrest structure applied to a folding wheelchair, comprising a mounting seat 1, a rotating seat 2, and an armrest assembly 3 mounted on the rotating seat 2. A support shaft 11 is provided on the mounting seat 1. Locking grooves 12 and a reset groove 13 are respectively provided on opposite end faces of the support shaft 11. The locking groove 12 and the reset groove 13 are communicated through a first axial through hole 14. A fixed gear disk 15 is provided on the groove end face of the locking groove 12;

[0029] Further, a rotating groove 21 is provided on one end face of the rotating seat 2. One end of the support shaft 11 provided with the locking groove 12 is supported in the rotating groove 21 in a matching manner. The rotating seat 2 can axially move along the support shaft 11 and can rotate with the support shaft 11 as a rotation axis. When the rotating seat 2 rotates, the armrest assembly 3 is driven to rotate simultaneously, so as to realize the adjustment of the angle of the armrest assembly 3;

[0030] Still further, a rotating gear disk 22 that moves in the locking groove 12 is fixedly provided in the rotating groove 21. The rotating gear disk 22 meshes with and disengages from the fixed gear disk 15 based on the axial movement of the rotating seat 2 along the support shaft 11; A reset shaft 4 located in the rotating groove 21 is fixedly connected to the rotating seat 2. One end of the reset shaft 4 passes through the first axial through hole 14 and then enters the reset groove 13 and is provided with a limit head 41; A meshing compression spring 5 for driving the rotating gear disk 22 to keep meshing with the fixed gear disk 15 is provided in the reset groove 13. The meshing compression spring 5 is sleeved on the reset shaft 4 and its two ends respectively abut against the end face of the limit head 41 and the groove end face of the reset groove 13.

[0031] When the angle of the armrest assembly 3 needs to be adjusted, first pull the rotating seat 2 to axially move along the support shaft 11 to make the rotating gear disk 22 away from the fixed gear disk 15 until the rotating gear disk 22 disengages from the fixed gear disk 15, and the connection between the two is disconnected, so that the fixed gear disk 15 releases the restriction on the rotating gear disk 22. At this time, the meshing compression spring 5 is compressed. Then rotate the rotating seat 2 to rotate the rotating seat 2 by an angle with the support shaft 11 as a rotation axis to realize the adjustment of the angle of the armrest assembly 3; After the angle of the armrest assembly 3 is adjusted, control the rotating seat 2 to axially move along the support shaft 11 to make the rotating gear disk 22 close to the fixed gear disk 15 until the rotating gear disk 22 meshes with the fixed gear disk 15, so that the fixed gear disk 15 restricts the rotating gear disk 22. At this time, the meshing compression spring 5 expands, so that the rotating gear disk 22 keeps meshing with the fixed gear disk 15 and the rotating seat 2 cannot rotate, realizing the locking of the angle of the armrest assembly 3.

[0032] The utility model is provided with a support shaft 11 on the mounting base 1, and the support shaft 11 is used to support and fit in the rotation groove 21 of the rotating base 2, so that the rotating base 2 is rotatably sleeved on the support shaft 11, thereby enabling the support shaft 11 to provide a supporting effect for the rotating base 2, reducing or even eliminating the need for the reset shaft 4 to bear the acting force generated when the armrest assembly 3 is stressed, reducing the probability of bending deformation of the reset shaft 4, and enabling the reset shaft 4 to stably move axially to lock and unlock the angle of the armrest assembly 3.

[0033] As a preferred embodiment, the circumferential groove wall of the rotation groove 21 is in sliding fit with the outer circumferential surface of the support shaft 11, so that the rotating base 2 can be stably rotatably mounted on the support shaft 11; in addition, a rotating round shaft 23 is integrally formed with a convex portion on the end surface of the rotation groove 21, the rotating tooth disc 22 is integrally formed on the end surface of the rotating round shaft 23, and the outer circumferential surface of the rotating round shaft 23 is in sliding fit with the circumferential groove wall of the locking groove 12, so that the rotating round shaft 23 provides a certain supporting force for the rotating base 2, further improving the stability of the rotating base 2 on the support shaft 11.

[0034] As a preferred embodiment, a receiving groove 24 is provided on the other end surface of the rotating base 2, a second axial through hole 25 penetrating the rotating round shaft 23 is provided on the end surface of the receiving groove 24, the other end of the reset shaft 4 extends into the receiving groove 24 from the second axial through hole 25 and is connected with a limiting member 6, the limiting member 6 is in sliding fit with the end surface of the receiving groove 24, and the limiting member 6 is used to limit the reset shaft 4 from exiting the receiving groove 24. Further, a hexagonal boss 42 is integrally formed on the other end of the reset shaft 4, a hexagonal groove adapted to the hexagonal boss 42 is provided on the limiting member 6, the hexagonal boss 42 is fitted in the hexagonal groove, and a locking bolt 7 for locking the limiting member 6 on the hexagonal boss 42 is threadedly connected to the hexagonal boss 42, thereby completing the combined installation of the limiting member 6 and the reset shaft 4. In addition, in order to improve the aesthetics and reduce the probability of the locking bolt 7 being corroded by foreign objects, the opening of the receiving groove 24 is closed by a cover 8.

[0035] In this embodiment, the support shaft 11 and the mounting base 1 are integrally formed by machining, so as to improve the connection stability between them, thereby ensuring the quality of the armrest assembly 3 after being installed on the wheelchair seat. In addition, the mounting base 1 is vertically arranged, the axial direction of the support shaft 11 is horizontally arranged in the left-right direction, and two shaft portion reinforcing ribs 16 are integrally formed at the rear end of the mounting base 1, and the two shaft portion reinforcing ribs 16 are respectively integrally connected to the upper and lower parts of the support shaft 11, so as to further improve the connection quality between the support shaft 11 and the mounting base 1.

[0036] In this embodiment, a connecting rod fitting groove 17 extending through the mounting base 1 from top to bottom is provided on the mounting base 1. The connecting rod fitting groove 17 is used for inserting and fitting with the armrest connecting part on the wheelchair seat. In this embodiment, the top view cross-sectional shape of the connecting rod fitting groove 17 is D-shaped. When the top view cross-sectional shape of the armrest connecting part on the wheelchair seat is also D-shaped, the connecting rod fitting groove 17 just fits with the armrest connecting part of the wheelchair seat, so that the mounting base 1 cannot rotate relative to the armrest connecting part of the wheelchair seat, thus ensuring that the mounting base 1 is always at an angle.

[0037] In this embodiment, a connecting counterbore 18 is provided at the front end of the mounting base 1. The front end of the connecting counterbore 18 penetrates through the front end of the mounting base 1, and the rear end communicates with the connecting rod fitting groove 17, so that the screw rod section of the mounting bolt can pass through the connecting counterbore 18 and be threadedly connected to the armrest connecting part of the wheelchair seat, completing the combined installation of the mounting base 1 on the armrest connecting part.

[0038] As a preferred embodiment, the fixed gear disk 15 is composed of a plurality of fixed tooth parts distributed around the outer circumference of the first axial through hole 14. The length of the fixed tooth part extends along the axial direction of the locking groove 12 and the cross-sectional profile size thereof remains unchanged; the rotating gear disk 22 is composed of a plurality of rotating tooth parts distributed around the outer circumference of the second axial through hole 25. The length of the rotating tooth part extends along the axial direction of the rotating groove 21 and the cross-sectional profile size thereof remains unchanged. Through the above structure, when the fixed gear disk 15 meshes with the rotating gear disk 22, the axial rotation of the rotating seat 2 can be restricted.

[0039] In this embodiment, a fixed tapered end is provided at one end of the fixed tooth part facing the rotating gear disk 22. The cross-sectional profile size of the fixed tapered end gradually decreases from the end connected to the fixed tooth part towards the opening direction of the locking groove 12; a rotating tapered end is provided at one end of the rotating tooth part facing the rotating gear disk 22. The cross-sectional profile size of the rotating tapered end gradually decreases from the end connected to the rotating tooth part towards the opening direction of the rotating groove 21. Through the above fixed tapered end and rotating tapered end, it is convenient for the rotating tooth part to be inserted between two circumferentially adjacent fixed tooth parts to make the fixed gear disk 15 mesh with the rotating gear disk 22.

[0040] As a preferred embodiment, the armrest assembly 3 includes a support rod 31 and an armrest pad 32 disposed on the support rod 31. The cross-sectional shape of the support rod 31 is D-shaped. A connecting portion 26 is provided on the rotating base 2. A first D-shaped fitting groove having the same cross-sectional shape as the support rod 31 is provided on the end face of the connecting portion 26 away from the rotating base 2. A second D-shaped fitting groove having the same cross-sectional shape as the support rod 31 is provided on the armrest pad 32. The rear end of the support rod 31 is fitted and installed in the first D-shaped fitting groove and locked and fixed by a first bolt. Through the above structure, the armrest assembly 3 cannot rotate arbitrarily relative to the connecting portion 26 after installation; the front end of the support rod 31 is fitted and installed in the second D-shaped fitting groove and locked and fixed by a second bolt, so that the armrest pad 32 cannot rotate arbitrarily relative to the support rod 31 after installation.

[0041] The above are only the preferred embodiments of the present invention. As long as the technical solutions that achieve the purpose of the present invention by substantially the same means fall within the protection scope of the present invention.

Claims

1. An armrest structure for a folding wheelchair, comprising a mounting seat (1), a rotating seat (2), and an armrest assembly (3) mounted on the rotating seat (2), characterized in that: The mounting seat (1) is provided with a support shaft (11), and opposite end surfaces of the support shaft (11) are respectively provided with a locking groove (12) and a reset groove (13), the locking groove (12) and the reset groove (13) are connected via a first axial through hole (14), and a fixed toothed disc (15) is provided on the groove end surface of the locking groove (12); A rotating groove (21) is provided on one end surface of the rotating seat (2); one end of the supporting shaft (11) provided with a locking groove (12) is supported in the rotating groove (21); the rotating seat (2) is capable of axial movement along the supporting shaft (11) and of rotating about the supporting shaft (11); A rotating toothed disc (22) movable in the locking groove (12) is fixedly disposed in the rotating groove (21), and the rotating toothed disc (22) engages with and disengages from the fixed toothed disc (15) based on the axial movement of the rotating seat (2) along the supporting shaft (11); The rotating seat (2) is fixedly connected to a reset shaft (4) located in the rotating groove (21); one end of the reset shaft (4) passes through the first axial through hole (14) and enters the reset groove (13) and is provided with a limit head (41); the reset groove (13) is provided with an engagement compression spring (5) for driving the rotating toothed disc (22) and the fixed toothed disc (15) to maintain an engagement state, and two ends of the engagement compression spring (5) respectively abut against the end surface of the limit head (41) and the groove end surface of the reset groove (13).

2. The armrest structure used for a folding wheelchair according to claim 1, characterized in that: A rotating shaft (23) is provided on a protrusion integrally formed on the groove end surface of the rotating groove (21); the rotating toothed disc (22) is integrally formed on the end surface of the rotating shaft (23); and the outer circumferential surface of the rotating shaft (23) is slidably matched with the circumferential groove wall of the locking groove (12).

3. The armrest structure used for a folding wheelchair according to claim 2, characterized in that: The other end surface of the rotating seat (2) is provided with a receiving groove (24), and the groove end surface of the receiving groove (24) is provided with a second axial through hole (25) penetrating the rotating circular shaft (23). The other end of the reset shaft (4) extends from the second axial through hole (25) into the receiving groove (24) and is connected to a limiting member (6). The limiting member (6) is slidably fitted on the groove end surface of the receiving groove (24).

4. The armrest structure used for a folding wheelchair according to claim 3, characterized in that: The opening of the containing groove (24) is closed by a sealing cover (8).

5. The armrest structure used for a folding wheelchair according to claim 1, characterized in that: The support shaft (11) and the mounting seat (1) are integrally formed.

6. The armrest structure used for a folding wheelchair according to claim 1, characterized in that: The mounting seat (1) is arranged vertically, the axial direction of the support shaft (11) is arranged horizontally along the left-right direction, and the rear end of the mounting seat (1) is integrally formed with two shaft reinforcement ribs (16), and the two shaft reinforcement ribs (16) are respectively integrally formed to connect the upper part and the lower part of the support shaft (11).

7. The armrest structure used for a folding wheelchair according to claim 1, characterized in that: The mounting seat (1) is provided with a connecting rod adapting groove (17) extending from top to bottom and penetrating the mounting seat (1), and the connecting rod adapting groove (17) is used for inserting and matching an armrest connecting portion on a wheelchair seat.

8. The armrest structure used for a folding wheelchair according to claim 7, characterized in that: The cross-sectional shape of the connecting rod adapting groove (17) in top view is D-shaped.

9. An armrest structure for a folding wheelchair according to any one of claims 1 to 8, characterized in that: The armrest assembly (3) comprises a support rod (31) and an armrest pad (32) arranged on the support rod (31).

10. The armrest structure used in a folding wheelchair according to claim 9, characterized in that: The cross-sectional shape of the support rod (31) is D-shaped, the rotating seat (2) is provided with a connecting portion (26), the end surface of the connecting portion (26) away from the rotating seat (2) is provided with a first D-shaped adapter groove having the same cross-sectional shape as the support rod (31), the armrest pad (32) is provided with a second D-shaped adapter groove having the same cross-sectional shape as the support rod (31), the rear end of the support rod (31) is fitted in the first D-shaped adapter groove, and the front end is fitted in the second D-shaped adapter groove.

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