Modular wheelchair armrest quick release structure

Abstract

A modular wheelchair armrest quick-release structure includes a backrest support rod, on which an armrest connecting assembly is provided. The armrest connecting assembly includes a first clamp and a second clamp located on both sides of the backrest support rod, and the first clamp and the second clamp are connected by a fixing bolt combination. This structural design allows the backrest support rod to be clamped between the first clamp and the second clamp, improving the ease of installation of the armrest connecting assembly.

Description

Technical Field

[0001] This utility model relates to the field of wheelchair technology, specifically to a modular wheelchair armrest quick-release structure. Background Technology

[0002] The applicant previously applied for a technical solution with application number 2024220387923. This solution features a mounting base with a backrest support rod adapter groove extending from top to bottom through the mounting base. This groove is used for the insertion and engagement of the armrest connection part on the wheelchair seat, which is then fixedly connected to the armrest connection part using bolts. While this structure effectively positions the armrest connection part and the mounting base, it is limited by the backrest support rod adapter groove. A separate armrest connection part needs to be installed on the wheelchair seat to insert into the groove, making direct installation on the existing wheelchair backrest support rod inconvenient. Utility Model Content

[0003] In order to overcome the shortcomings of the existing technology, this utility model provides a modular wheelchair armrest quick-release structure.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] A modular wheelchair armrest quick-release structure includes a backrest support rod, with each backrest support rod corresponding to an armrest module. The characteristic is that the backrest support rod is provided with an armrest connecting assembly, which includes a first clamp and a second clamp located on both sides of the backrest support rod, and the first clamp and the second clamp are connected by a combination of fixing bolts.

[0006] The first clamp has a mounting hole on one side. The handrail module includes a handrail main rod. The rear end of the handrail main rod is fixed with a handrail pivot. One end of the handrail pivot is rotatably fitted in the mounting hole. The annular hole wall of the mounting hole is provided with an anti-detachment limiting hole and an angle limiting hole.

[0007] The handrail pivot has a pivot ring groove around its outer circumference at one end located in the mounting hole. An anti-detachment limiting member is installed in the anti-detachment limiting hole and a rotation limiting member is installed in the angle limiting hole to contact the handrail pivot and limit its rotation.

[0008] In this invention, the inner groove surface of the rotating shaft annular groove is composed of multiple angular positioning surfaces distributed in a ring; the rotation limiting member includes a locking insert for pressing against one of the angular positioning surfaces to lock the angle of the armrest rotating shaft.

[0009] In this utility model, the angle limiting hole is a first screw hole; the rotation limiting component includes an angle limiting screw and an angle round shaft portion integrally formed and connected along the axial direction. The angle limiting screw is threadedly engaged with the first screw hole. An operating handwheel is provided at the end of the angle limiting screw that is away from the angle round shaft portion. The angle round shaft portion extends into the rotating shaft annular groove and slides in contact with the annular groove end face of the rotating shaft annular groove.

[0010] In this utility model, the anti-detachment limiting component includes an anti-detachment round shaft, an anti-detachment screw, and an anti-detachment limiting head integrally connected in sequence along the axial direction. The anti-detachment limiting hole includes an anti-detachment screw hole and an anti-detachment through hole connected in sequence along the axial direction. The anti-detachment through hole penetrates the outer side of the first clamp. The anti-detachment screw hole is connected to the mounting round hole. The anti-detachment limiting head is located inside the anti-detachment through hole. The anti-detachment screw is threadedly engaged with the anti-detachment screw hole. The anti-detachment round shaft extends into the rotating shaft annular groove and slides in contact with the annular groove end face of the rotating shaft annular groove.

[0011] In this utility model, the handrail pivot includes a pivot head and a pivot part connected sequentially along the axial direction. The diameter of the pivot head is larger than the diameter of the pivot part. The pivot head slides against the outer side of the first clamp. The pivot annular groove is provided on the pivot part. The pivot part is rotatably fitted in the mounting hole.

[0012] In this utility model, the end face of the shaft head connected to the shaft part is provided with a plurality of angle positioning grooves corresponding one-to-one with the angle positioning surface. The first clamp is provided with at least two positioning mating grooves distributed around the outer circumference of the mounting hole. The positioning mating groove is provided with a positioning bead for being inserted into one of the angle positioning grooves and a positioning spring for using elastic force to push the positioning bead to move in the direction of the angle positioning groove.

[0013] In this utility model, the first clamp is provided with a first tube groove, the second clamp is provided with a second tube groove corresponding to the first tube groove, and the two sides of the chair back support rod are respectively partially embedded in the first tube groove and the second tube groove.

[0014] In this utility model, the backrest support rod is provided with a connecting through hole, the first clamp is provided with a first through hole and a nut positioning hole that are axially connected in sequence, the second clamp is provided with a second through hole corresponding to the first through hole, and the screw section of the fixing bolt passes through the second through hole, the connecting through hole and the first through hole and is threadedly connected to a fixing nut located in the nut positioning hole.

[0015] In this utility model, the other side of the first clamp is also provided with an embedding groove, the first tube groove is located on one groove surface of the embedding groove, and the second clamp is embedded into the embedding groove.

[0016] In this utility model, two symmetrical positioning slots are provided on one side of the embedding groove, and two positioning inserts are provided on the second clamp, each positioning insert being inserted into a positioning slot.

[0017] The beneficial effects of this utility model are as follows: The armrest connecting assembly of this utility model includes a first clamp and a second clamp located on both sides of the backrest support rod. The first clamp and the second clamp are connected by a fixing bolt combination. This structural design allows the backrest support rod to be clamped between the first clamp and the second clamp, improving the ease of installation of the armrest connecting assembly. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0019] Figure 1 This is a three-dimensional representation of the present embodiment. Figure 1 ;

[0020] Figure 2 This is a three-dimensional representation of the present embodiment. Figure 2 ;

[0021] Figure 3 For the explosion in this embodiment Figure 1 ;

[0022] Figure 4 For the explosion in this embodiment Figure 2 ;

[0023] Figure 5 This is a schematic diagram of the installation of the fixing bolts;

[0024] Figure 6 A schematic diagram showing the installation of the anti-detachment limiting component and the rotation limiting component;

[0025] Figure 7 This is a schematic diagram of the installation of the positioning bead and the positioning spring. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0027] It should be noted that if any directional indication (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial, etc.) is involved in the embodiments of this utility model, the directional indication is only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0028] Furthermore, unless otherwise explicitly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection using welding, a detachable connection using bolts, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0030] Reference Figure 1-7 A modular wheelchair armrest quick-release structure includes a wheelchair body and two armrest modules. The wheelchair body includes two backrest support rods 100, and each backrest support rod 100 is equipped with an armrest module. Specifically, the backrest support rod 100 is provided with an armrest connecting assembly. The armrest connecting assembly includes a first clamp 1 and a second clamp 2 located on both sides of the backrest support rod 100, and the first clamp 1 and the second clamp 2 are connected by a fixing bolt 3.

[0031] Furthermore, a mounting hole 11 is provided on one side of the first clamp 1. The handrail module includes a handrail main rod 4. The rear end of the handrail main rod 4 is fixed with a handrail pivot 41 by welding. One end of the handrail pivot 41 is rotatably fitted in the mounting hole 11. The annular hole wall of the mounting hole 11 is provided with an anti-detachment limiting hole 12 and an angle limiting hole 13. The anti-detachment limiting hole 12 and the angle limiting hole 13 both penetrate the first clamp 1 radially along the mounting hole 11.

[0032] Furthermore, the armrest pivot 41 has a pivot ring groove 410 surrounding the outer circumference of the armrest pivot 41 at one end located in the mounting hole 11, an anti-detachment limiting member 5 extending into the pivot ring groove 410 is installed in the anti-detachment limiting hole 12, and a rotation limiting member 6 for contacting the armrest pivot 41 to limit the rotation of the armrest pivot 41 is installed in the angle limiting hole 13.

[0033] In a preferred embodiment, the rotating shaft annular groove 410 is composed of two annular groove end faces spaced apart to the left and right and an annular groove inner groove surface located between the two annular groove end faces. The left and right ends of the annular groove inner groove surface are respectively connected to the inner ring of the annular groove end faces. The side view cross-section of the annular groove inner groove surface of the rotating shaft annular groove 410 is polygonal, that is, the annular groove inner groove surface of the rotating shaft annular groove 410 is composed of multiple angle positioning surfaces distributed along the ring. The angle limiting hole 13 is a first screw hole. The rotation limiting member 6 includes an angle limiting screw 61, an angle round shaft part 62, and a locking insert 63 for pressing against one of the angle positioning surfaces to lock the angle of the armrest rotating shaft 41. The locking inserts 63 are integrally formed and connected along the axial direction. The angle limiting screw 61 is threadedly engaged with the first screw hole. The end of the angle limiting screw 61 away from the angle shaft part 62 is provided with an operating handwheel 64. The angle shaft part 62 extends into the rotating shaft annular groove 410. The angle shaft part 62 slides in contact with the annular groove end face of the rotating shaft annular groove 410, so that the angle shaft part 62 can also restrict the handrail rotating shaft 41 from falling out of the mounting hole 11. By rotating the angle limiting screw 61 with the handwheel, the locking inserts 63 can be controlled to separate and abut against the angle positioning surface. When the locking inserts 63 of the rotating limiting member 6 abut against the angle positioning surface, the handrail main rod 4 cannot be rotated, thereby realizing the locking of the handrail module angle.

[0034] In a preferred embodiment, the anti-detachment limiting component 5 includes an anti-detachment round shaft 51, an anti-detachment screw 52, ​​and an anti-detachment limiting head 53 integrally connected in sequence along the axial direction. The anti-detachment limiting hole 12 includes an anti-detachment screw hole 121 and an anti-detachment through hole 122 connected in sequence along the axial direction. The anti-detachment through hole 122 penetrates the outer side of the first clamp 1. The anti-detachment screw hole 121 is connected to the mounting round hole 11. The anti-detachment limiting head 53 is located inside the anti-detachment through hole 122. The anti-detachment screw 52 is threadedly engaged with the anti-detachment screw hole 121. The anti-detachment round shaft 51 extends into the rotating shaft annular groove 410 and slides in contact with the annular groove end face of the rotating shaft annular groove 410, thereby allowing the anti-detachment round shaft 51 to prevent the handrail rotating shaft 41 from falling out of the mounting round hole 11.

[0035] In a preferred embodiment, the handrail pivot 41 includes a pivot head 411 and a pivot part 412 connected sequentially along the axial direction. The diameter of the pivot head 411 is larger than the diameter of the pivot part 412. The pivot head 411 slides against the outer side of the first clamp 1. The pivot annular groove 410 is provided on the pivot part 412. The pivot part 412 is rotatably fitted in the mounting hole 11. Furthermore, the end face connecting the rotating shaft head 411 and the rotating shaft part 412 is provided with a plurality of angle positioning grooves 413 corresponding one-to-one with the angle positioning surface. The angle positioning groove 413 is a circular groove formed by a concave curved surface. The first clamping seat 1 is provided with at least two positioning mating grooves 14 distributed around the outer periphery of the mounting circular hole 11. The positioning mating groove 14 is provided with a positioning bead 7 for being inserted into one of the angle positioning grooves 413 and a positioning spring 8 for using elastic force to push the positioning bead 7 to move in the direction of the angle positioning groove 413. By using the positioning bead 7 to be inserted into the angle positioning groove 413, it is convenient for the user to know that the corresponding handrail module has swung to the corresponding angle. At this time, the locking insert 63 of the rotating limit member 6 can be operated to abut against the angle positioning surface to lock the angle of the handrail module.

[0036] In a preferred embodiment, the first clamp 1 is provided with a first tube groove 15, and the second clamp 2 is provided with a second tube groove 21 corresponding to the first tube groove 15. The two sides of the chair back support rod 100 are respectively partially embedded in the first tube groove 15 and the second tube groove 21, so that the first clamp 1 and the second clamp 2 cannot rotate relative to the chair back support rod 100. The chair back support rod 100 is provided with a connecting through hole 200. The first clamp 1 is provided with a first through hole and a nut positioning hole 16 that are axially connected in sequence. The second clamp 2 is provided with a second through hole 22 corresponding to the first through hole. The screw section of the fixing bolt 3 passes through the second through hole 22, the connecting through hole 200 and the first through hole and is threadedly connected to a fixing nut 9 located in the nut positioning hole 16, thereby realizing the combined connection between the first clamp 1, the second clamp 2 and the chair back support rod 100.

[0037] In this embodiment, an embedding groove 17 is provided on the other side of the first clamp 1. The first tube groove 15 is located on one groove surface of the embedding groove 17. The second clamp 2 is embedded in the embedding groove 17, so that the first clamp 1 wraps around the second clamp 2. Further, two symmetrical positioning slots 18 are provided on one groove surface of the embedding groove 17. The second clamp 2 is provided with two positioning inserts 23. Each positioning insert 23 is inserted into a positioning slot 18, so that the first clamp 1 and the second clamp 2 are positioned relative to each other, which facilitates the correspondence between the first through hole and the second through hole 22 and provides convenience for the fixing bolt 3 to pass through the first through hole and the second through hole 22. In addition, the cross-sectional shape of the positioning insert 23 and the cross-sectional shape of the positioning slot 18 are both square. The cross-sectional shape and size of the positioning insert 23 and the cross-sectional shape and size of the positioning slot 18 are adapted to each other, so that after the positioning insert 23 is inserted into the positioning slot 18, the first clamp 1 and the second clamp 2 can fit together tightly.

[0038] In this embodiment, the end of the positioning insert 23 away from the second clamp 2 is provided with an insertion tapering portion 24 that facilitates the insertion of the positioning insert 23 into the positioning slot 18. The cross-sectional shape and size of the insertion tapering portion 24 gradually decrease along the direction away from the second clamp 2, so as to facilitate the insertion of the positioning insert 23 into the positioning slot 18.

[0039] In this embodiment, the handrail module further includes a handrail pad 10 fixed on the main handrail rod 4, and the handrail pad 10 and the main handrail rod 4 are connected by bolts.

[0040] The above description is only a preferred embodiment of the present utility model. Any technical solution that achieves the purpose of the present utility model by essentially the same means shall fall within the protection scope of the present utility model.

Claims

1. A modular wheelchair armrest quick release structure, comprising a backrest support rod (100), each backrest support rod (100) corresponding to the installation of an armrest module; characterized in that: The backrest support rod (100) is provided with an armrest connection assembly. The armrest connection assembly includes a first clamp (1) and a second clamp (2) located on both sides of the backrest support rod (100). The first clamp (1) and the second clamp (2) are connected by a fixing bolt (3). The first clamp (1) has a mounting hole (11) on one side. The handrail module includes a handrail main rod (4). The rear end of the handrail main rod (4) is fixed with a handrail pivot (41). One end of the handrail pivot (41) is rotatably fitted in the mounting hole (11). The annular hole wall of the mounting hole (11) is provided with an anti-detachment limiting hole (12) and an angle limiting hole (13). The handrail pivot (41) has a pivot ring groove (410) around the outer periphery of the armrail pivot (41) at one end located in the mounting hole (11). An anti-detachment limiting member (5) is installed in the anti-detachment limiting hole (12) and extends into the pivot ring groove (410). A rotation limiting member (6) is installed in the angle limiting hole (13) for contacting the handrail pivot (41) to limit the rotation of the handrail pivot (41).

2. The modular wheelchair armrest quick-release structure according to claim 1, characterized in that: The inner groove surface of the rotating shaft annular groove (410) is composed of multiple angular positioning surfaces distributed along the annular shape; the rotation limiting member (6) includes a locking insert (63) for pressing against one of the angular positioning surfaces to lock the angle of the armrest rotating shaft (41).

3. The modular wheelchair armrest quick-release structure according to claim 2, characterized in that: The angle limiting hole (13) is the first screw hole; the rotation limiting component (6) includes an angle limiting screw (61) and an angle round shaft (62) integrally formed and connected along the axial direction. The angle limiting screw (61) is threadedly engaged with the first screw hole. An operating handwheel (64) is provided at one end of the angle limiting screw (61) away from the angle round shaft (62). The angle round shaft (62) extends into the rotating shaft annular groove (410). The angle round shaft (62) slides in contact with the annular groove end face of the rotating shaft annular groove (410).

4. The modular wheelchair armrest quick-release structure according to claim 1, characterized in that: The anti-detachment limiting component (5) includes an anti-detachment round shaft (51), an anti-detachment screw (52), and an anti-detachment limiting head (53) integrally connected in sequence along the axial direction. The anti-detachment limiting hole (12) includes an anti-detachment screw hole (121) and an anti-detachment through hole (122) connected in sequence along the axial direction. The anti-detachment through hole (122) penetrates the outer side of the first clamp (1). The anti-detachment screw hole (121) is connected to the mounting round hole (11). The anti-detachment limiting head (53) is located inside the anti-detachment through hole (122). The anti-detachment screw (52) is threadedly engaged with the anti-detachment screw hole (121). The anti-detachment round shaft (51) extends into the rotating shaft annular groove (410) and slides in contact with the annular groove end face of the rotating shaft annular groove (410).

5. The modular wheelchair armrest quick-release structure according to claim 1, characterized in that: The handrail pivot (41) includes a pivot head (411) and a pivot part (412) connected in sequence along the axial direction. The diameter of the pivot head (411) is larger than the diameter of the pivot part (412). The pivot head (411) slides against the outer side of the first clamp (1). The pivot ring groove (410) is provided on the pivot part (412). The pivot part (412) is rotatably fitted in the mounting hole (11).

6. The modular wheelchair armrest quick-release structure according to claim 5, characterized in that: The end face of the shaft head (411) connected to the shaft part (412) is provided with a plurality of angle positioning grooves (413) corresponding one-to-one with the angle positioning surface. The first clamp (1) is provided with at least two positioning mating grooves (14) distributed around the outer periphery of the mounting round hole (11). The positioning mating groove (14) is provided with a positioning bead (7) for being inserted into one of the angle positioning grooves (413) and a positioning spring (8) for using elastic force to push the positioning bead (7) to move towards the angle positioning groove (413).

7. The modular wheelchair armrest quick-release structure according to claim 1, characterized in that: The first clamp (1) is provided with a first tube groove (15), and the second clamp (2) is provided with a second tube groove (21) corresponding to the first tube groove (15). The two sides of the chair back support rod (100) are respectively partially embedded in the first tube groove (15) and the second tube groove (21).

8. The modular wheelchair armrest quick-release structure according to claim 7, characterized in that: The backrest support rod (100) is provided with a connecting through hole (200), the first clamp (1) is provided with a first through hole and a nut positioning hole (16) connected axially in sequence, the second clamp (2) is provided with a second through hole (22) corresponding to the first through hole, and the screw section of the fixing bolt (3) passes through the second through hole (22), the connecting through hole (200) and the first through hole and is threaded to a fixing nut (9) located in the nut positioning hole (16).

9. A modular wheelchair armrest quick-release structure according to claim 7, characterized in that: The other side of the first clamp (1) is also provided with an embedding groove (17), the first tube groove (15) is located on a groove surface of the embedding groove (17), and the second clamp (2) is embedded in the embedding groove (17).

10. A modular wheelchair armrest quick-release structure according to claim 9, characterized in that: The embedding groove (17) is also provided with two symmetrical positioning slots (18) on one side, and the second clamp (2) is provided with two positioning inserts (23), each positioning insert (23) being inserted into a positioning slot (18).

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