wheelchair

Abstract

A wheelchair comprises a seat, a backrest and an adjusting structure, the adjusting structure comprises a mounting base, a supporting member and a connecting member, the mounting base is connected to the seat, the supporting member is rotationally connected to the mounting base; the supporting member comprises a supporting plate, a first gear rack, a second gear rack, a gear assembly and a switching assembly, the mounting base is provided with a first rotation part and a second rotation part, the first gear rack, the second gear rack and the gear assembly are arranged on the supporting plate, the supporting plate is rotationally connected to the first rotation part through a rotation shaft, the connecting member is connected between the second rotation part and the switching assembly, the switching assembly is connected to the first gear rack, the backrest is slidingly connected to the front surface of the supporting plate, the backrest is connected to the second gear rack, the first gear rack is meshingly connected to the gear assembly, and the gear assembly is meshingly connected to the second gear rack.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and more particularly to a wheelchair. Background Technology

[0002] Powered wheelchairs are important tools for rehabilitation, typically consisting of a seat and a backrest. The backrest is usually directly connected to the seat to support the user's back while seated. However, existing powered wheelchairs only allow for backrest angle adjustment, not backrest extension relative to the seat. Summary of the Invention

[0003] This application provides a wheelchair designed to at least address the technical problems existing in the prior art.

[0004] This application provides a wheelchair, including:

[0005] Seats;

[0006] Backrest;

[0007] An adjustment structure is provided, comprising a mounting base and a support member, wherein the mounting base is connected to the seat and the support member is rotatably connected to the mounting base.

[0008] The adjustment structure further includes a connecting component. The supporting component includes a supporting plate, a first rack, a second rack, a gear assembly, and a transition assembly. The mounting base is provided with a first rotating part and a second rotating part. The first rack, the second rack, and the gear assembly are disposed on the supporting plate. The supporting plate is rotatably connected to the first rotating part via a rotating shaft. The connecting component is connected between the second rotating part and the transition assembly. The transition assembly is connected to the first rack. The backrest is slidably connected to the front of the supporting plate. The backrest is connected to the second rack. The first rack is meshed with the gear assembly, and the gear assembly is meshed with the second rack.

[0009] When the angle between the support plate and the seat increases, the backrest slides on the support plate toward the direction of rotation; when the angle between the support plate and the seat decreases, the backrest slides on the support plate away from the direction of rotation.

[0010] In a wheelchair according to one embodiment of this application, a groove structure is formed on the support plate, the gear assembly is rotatably mounted in the groove structure, and the first rack and the second rack are disposed on both sides of the gear assembly and slidably mounted in the groove structure.

[0011] In a wheelchair according to one embodiment of this application, the groove structure includes a first groove and a second groove, the gear assembly includes a first gear and a second gear, the first gear is connected to the second gear, the first gear and the second gear rotate synchronously, the first groove is disposed on the front side of the support plate, the second groove is disposed on the back side of the support plate, the first gear meshes with a first rack and is disposed in the first groove, and the second gear meshes with a second rack and is disposed in the second groove.

[0012] In a wheelchair according to one embodiment of this application, the gear assembly includes a connecting shaft, a rotating hole is provided between the first groove and the second groove, the connecting shaft is rotatably mounted in the rotating hole, and the first gear and the second gear are disposed on the connecting shaft.

[0013] In a wheelchair according to one embodiment of this application, the groove structure includes a first recess, a second recess, and a third recess. The first recess is connected to the second recess through the third recess. The first recess and the second recess are disposed on opposite sides of the third recess and extend along the sliding direction of the backrest. The first rack is slidably installed in the first recess, the second rack is slidably installed in the second recess, and the gear assembly is rotatably installed in the third recess.

[0014] In a wheelchair according to one embodiment of this application, the first recess, the second recess, and the third recess are all formed on the front side of the support plate. The bottom of the first recess has a groove communicating with the back side of the support plate. At least a portion of the adapter assembly passes through the groove and connects to the first rack; or,

[0015] The first, second, and third recesses are all formed on the back of the support plate. The bottom of the second recess has a groove that connects to the front of the support plate. The transmission part of the backrest passes through the groove and connects to the second rack.

[0016] In a wheelchair according to one embodiment of this application, the gear assembly includes a first gear, a second gear, and a connecting shaft. The first gear and the second gear are disposed on the connecting shaft. The first gear and the second gear rotate synchronously. The connecting shaft is rotatably mounted on the third recess. The first gear meshes with the first rack, and the second gear meshes with the second rack.

[0017] In a wheelchair according to one embodiment of this application, the diameter of the first gear is smaller than the diameter of the second gear.

[0018] In a wheelchair according to one embodiment of this application, the gear assembly includes a third gear, which is rotatably mounted in the third recess and meshes with the first rack and the second rack.

[0019] In one embodiment of the wheelchair of this application, the support plate is provided with a first slide rail, and the adapter assembly is provided with a first slider. The position of the first slider corresponds to the position of the first slide rail, and the adapter assembly is slidably connected to the support plate through the cooperation of the first slider and the first slide rail; and / or,

[0020] The support plate is provided with a second slide rail, and the backrest is provided with a second slider. The position of the second slider corresponds to the position of the second slide rail, and the backrest is slidably connected to the support plate through the cooperation of the second slider and the second slide rail.

[0021] The technical solution provided in this application embodiment can include the following beneficial effects: This application designs a wheelchair, including a seat, a backrest, and an adjustment structure. The adjustment structure includes a mounting base, a connecting component, and a support component. The mounting base is connected to the seat and has a first rotating part and a second rotating part. The support component includes a support plate, a first rack, a second rack, a gear assembly, and a transition assembly. The support plate is rotatably connected to the first rotating part via a rotating shaft. The first rack, the second rack, and the gear assembly are disposed on the support plate. The connecting component is connected between the second rotating part and the transition assembly. The transition assembly is connected to the first rack. The backrest is connected to the second rack. The gear assembly is drively connected to the first rack and the second rack. When the support plate rotates around the first rotating part, the rotation of the support plate drives the first rack to slide in the direction toward or away from the rotating shaft through the connecting component. The first rack drives the second rack to slide through the gear assembly, so that the second rack can drive the backrest to slide, achieving ergonomic adaptation and allowing the backrest to be extended and adjusted.

[0022] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a partial structural schematic diagram of a wheelchair provided in one embodiment of this application;

[0025] Figure 2 yes Figure 1 A partial structural diagram of the wheelchair from another angle;

[0026] Figure 3 yes Figure 1A partial exploded view of the wheelchair in the image;

[0027] Figure 4 yes Figure 1 A structural diagram of the seat in the diagram;

[0028] Figure 5 yes Figure 1 An exploded diagram of the backrest and adjustment mechanism;

[0029] Figure 6 yes Figure 5 A schematic diagram of the backrest structure;

[0030] Figure 7 yes Figure 5 A schematic diagram of the decomposed adjustment structure in the diagram;

[0031] Figure 8 yes Figure 5 A cross-sectional schematic diagram of the adjustment structure in the middle;

[0032] Figure 9 yes Figure 5 A schematic diagram of the structure of the adapter component in the diagram;

[0033] Figure 10 yes Figure 5 A partial schematic diagram of the adjustment structure in the middle;

[0034] Figure 11 yes Figure 10 A schematic diagram of the adjustment structure from another angle;

[0035] Figure 12 yes Figure 7 A schematic diagram of the support plate in the middle;

[0036] Figure 13 yes Figure 7 An exploded view of the gear assembly in the diagram;

[0037] Figure 14 This is a schematic diagram of the adjustment structure provided in another embodiment of this application;

[0038] Figure 15 yes Figure 13 A cross-sectional schematic diagram of the adjustment structure in the middle;

[0039] Figure 16 yes Figure 13 A schematic diagram of the decomposed adjustment structure in the diagram;

[0040] Figure 17 yes Figure 16 A schematic diagram of the gear assembly in the diagram;

[0041] Figure 18 yes Figure 17 An exploded view of the gear assembly in the diagram;

[0042] Figure 19 This is a schematic diagram of the adjustment structure provided in another embodiment of this application;

[0043] Figure 20 yes Figure 19 A cross-sectional schematic diagram of the adjustment structure in the middle;

[0044] Figure 21 yes Figure 19 A schematic diagram of the decomposed adjustment structure in the diagram;

[0045] Figure 22 yes Figure 21 A schematic diagram of the gear assembly.

[0046] Explanation of reference numerals in the attached figures:

[0047] 100. Adjustment structure; 101. Supporting component; 102. Connecting component;

[0048] 10. Transmission assembly; 11. Gear assembly; 111. First gear; 112. Second gear; 113. Third gear; 114. Connecting shaft; 115. Locking element; 12. First rack; 13. Second rack;

[0049] 20. Support plate; 21. First slide rail; 22. Second slide rail; 23. Groove structure; 23a. First groove; 23b. Second groove; 23c. Rotating hole; 23d. First recessed groove; 23e. Second recessed groove; 23f. Third recessed groove; 231. Slide groove;

[0050] 30. Adapter assembly; 31. Adapter piece; 311. Adapter shaft; 32. Connector piece; 33. First slider;

[0051] 40. First cover plate; 41. First opening;

[0052] 50. Second cover plate; 51. Second opening;

[0053] 60. First guide rail component; 70. Second guide rail component;

[0054] 200. Backrest; 201. Transmission unit; 202. Second slider;

[0055] 300, Seat; 300a, Mounting base; 301, First rotating part; 302, Second rotating part;

[0056] 400. Rotating shaft. Detailed Implementation

[0057] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0058] It should also be understood that the terminology used in this application specification is merely for describing specific realities within the scope of this application. It is important to understand that terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used solely for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0059] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0060] like Figures 1 to 3 As shown, this application provides a wheelchair, which includes an adjustment structure 100, a seat 300 for sitting, and a backrest 200 for leaning. The adjustment structure 100 is connected to the seat 300 and the backrest 200. When an external force causes the backrest 200 to rotate relative to the seat 300, the rotation of the backrest 200 can be driven to slide by the adjustment structure 100, achieving ergonomic adaptation and allowing the backrest 200 to be extended and adjusted.

[0061] In one alternative implementation, such as Figures 3 to 5As shown, the adjustment structure 100 includes a mounting base 300a and a support member 101. The mounting base 300a is connected to the seat 300, and the support member 101 is rotatably connected to the mounting base 300a. The backrest 200 is slidably connected to the front of the support member 101. The seat 300 and the mounting base 300a can be two independent mechanisms, with the mounting base 300a connected to the seat 300. Alternatively, the seat 300 and the mounting base 300a can be an integrally connected structure, which also allows for connection between the seat 300 and the mounting base 300a; this application does not impose any limitations on this.

[0062] In one alternative implementation, such as Figures 3 to 5 As shown, the adjustment structure 100 also includes a connecting member 102. The mounting base 300a has a first rotating part 301 and a second rotating part 302 on both sides. The support member 101 is rotatably connected to the first rotating part 301 through a rotating shaft 400. The support member 101 is provided with a transmission assembly 10 that is tractively connected to the backrest 200. The connecting member 102 is rotatably connected between the second rotating part 302 and the transmission assembly 10, so that the backrest 200 can slide along the support member 101 toward the rotating shaft 400 by the change of angle between the support member 101 and the seat 300. That is, the backrest 200 automatically extends and adjusts by the change of the tilt angle between the support member 101 and the seat 300, thereby achieving ergonomic adaptation.

[0063] It should be noted that the connecting member 102 is rotatably connected between the second rotating part 302 and the transmission assembly 10. This means that the second rotating part 302 and the transmission assembly 10 are respectively rotatably connected to the connecting member 102. For example, one end of the connecting member 102 may be rotatably connected to the second rotating part 302, and the other end of the connecting member 102 may be rotatably connected to the transmission assembly 10, so that the backrest 200 can slide along the support member 101 toward or away from the rotation axis 400 by the change in angle between the support member 101 and the seat 300.

[0064] In one alternative implementation, such as Figures 4 to 8 As shown, the support member 101 includes a support plate 20, which is rotatably connected to the first rotating part 301 via a rotating shaft 400. The transmission assembly 10 is mounted on the support plate 20, and the backrest 200 is slidably connected to the front of the support plate 20 and is connected to the transmission assembly 10, so that the backrest 200 can slide along the support plate 20 towards or away from the rotating shaft 400 by the change in angle between the support plate 20 and the seat 300. That is, the backrest 200 can automatically extend and adjust by the change in the tilt angle between the support plate 20 and the seat 300, thereby achieving ergonomic adaptation.

[0065] For example, when the angle between the support plate 20 and the seat 300 increases, the backrest 200 slides on the support plate 20 toward the direction of rotation axis 400; when the angle between the support plate 20 and the seat 300 decreases, the backrest 200 slides on the support plate 20 away from the direction of rotation axis 400, so that the backrest 200 can be extended and adjusted by the change in the angle between the support plate 20 and the seat 300.

[0066] It should be noted that the mounting base 300a can be directly integrated with the seat 300, reducing the number of connecting parts 32 and improving structural strength; or, the mounting base 300a can also be connected to the seat 300 by assembly, with the first rotating part 301 and the second rotating part 302 symmetrically arranged or on both sides of the mounting base 300a, so that the support plate 20, as a rigid load-bearing component, can be hinged to the two first rotating parts 301 through the rotating shaft 400, thereby realizing the rotational connection between the support plate 20 and the seat 300.

[0067] The transmission component 10 is mounted on the support plate 20 and may be hidden inside the support plate 20 to achieve a compact spatial layout. The connecting component 102 connects the second rotating part 302 and the transmission component 10 as a power transmission medium, so that the rotation of the support plate 20 can drive the transmission component 10 through the connecting component 102 to drive the backrest 200 to slide linearly along the support plate 20, thereby converting the rotational motion of the support plate 20 into the linear displacement of the backrest 200, improving the adjustability and ease of use of the wheelchair.

[0068] After adopting the above technical solution, since the support plate 20 is hinged to the first rotating part 301, the support plate 20 can rotate around it to change its angle with the seat 300; while the transmission assembly 10 is linked to the second rotating part 302 through the connecting member 102 to convert the change in the angle between the support plate 20 and the seat 300 into the extension movement of the backrest 200. The support plate 20, as the mounting base for the backrest 200 and the transmission assembly 10, can be rotated relative to the seat 300 or the mounting base 300a by manual or electric power, thereby triggering the backrest 200 to slide along the extension direction, achieving automatic adjustment and ensuring stable support for the user in different postures. At the same time, this application mounts the transmission assembly 10 on the support plate 20 or hides most of the structure of the transmission assembly 10 inside the support plate 20, so that when the backrest 200 is adjusted at the angle, most of the structure can prevent interference with the hinge when the support plate 20 rotates, and also improves the problem of the hinge being entangled by clothing or other foreign objects.

[0069] In one alternative implementation, such as Figure 3 , Figures 6 to 13As shown, the transmission assembly 10 includes a first rack 12, a second rack 13, and a gear assembly 11. The first rack 12, second rack 13, and gear assembly 11 are mounted on the support plate 20. The first rack 12 is rotatably connected to the connecting member 102 via a transition assembly 30. The second rack 13 is connected to the backrest 200. The gear assembly 11 is drive-connected to the first rack 12 and the second rack 13; that is, the first rack 12 is meshed with the gear assembly 11, and the gear assembly 11 is meshed with the second rack 13, ensuring that the first rack 12 and the second rack 13 move in opposite directions, thereby enabling… The driving force from the connecting member 102 is converted into linear motion of the first rack 12. The first rack 12 then drives the second rack 13 to slide toward or away from the rotation axis 400 through the gear assembly 11, thereby driving the backrest 200 to slide along the extension direction of the support plate 20, ensuring the synchronicity of the position of the backrest 200 and the angle change of the seat 300. At the same time, this application also breaks through the mode of independent adjustment of the backrest 200 and the seat 300 of the wheelchair, so as to improve the comfort of use through the mechanical self-feedback mechanism, which is suitable for people with disabilities with limited independent mobility.

[0070] For example, when the angle between the support plate 20 and the seat 300 increases, the support plate 20 rotates counterclockwise relative to the seat 300 around the first rotating part 301. During the rotation, the connecting member 102 pushes the adapter 30 to slide away from the rotating axis 400. The adapter 30 drives the first rack 12 to slide away from the rotating axis 400, so that the first rack 12 can drive the second rack 13 to slide towards the rotating axis 400 through the gear assembly 11. This, in turn, drives the backrest 200 connected to the second rack 13 to slide on the support plate 20 towards the rotating axis 400. Similarly, when the angle between the support plate 20 and the seat 300 decreases, the support plate 20 rotates clockwise relative to the seat 300 or the mounting base 300a around the first rotating part 301. During the rotation of the support plate 20, the connecting member 102 pulls the adapter assembly 30 to slide towards the rotation axis 400. The adapter assembly 30 drives the first rack 12 to slide towards the rotation axis 400, so that the first rack 12 can drive the second rack 13 to slide away from the rotation axis 400 through the gear assembly 11. This, in turn, drives the backrest 200 connected to the second rack 13 to slide away from the rotation axis 400 on the support plate 20. That is, this application can realize the reversing function of the adapter assembly 30 and the backrest 200 through the cooperation of the first rack 12, the second rack 13 and the gear assembly 11, so that the movement directions of the adapter assembly 30 and the backrest 200 are opposite.

[0071] In one optional implementation, the travel of the first rack 12 is no greater than the travel of the second rack 13, ensuring that the movement of the backrest 200 is no less than the input displacement of the adapter component 30. This guarantees both precise control of the seat 300 angle adjustment and a wide range of positional adjustment of the backrest 200, meeting the dual requirements of fine-tuning and macro-motion in ergonomics. In other words, the adapter component 30 provides a small travel input, while the backrest 200 provides a large travel output. Of course, depending on the actual situation, the travel of the first rack 12 can also be greater than the travel of the second rack 13.

[0072] In an optional embodiment, the support plate 20 is provided with a first slide rail 21, and the adapter 30 is provided with a first slider 33. The position of the first slider 33 corresponds to the position of the first slide rail 21. The adapter 30 is slidably connected to the support plate 20 through the cooperation of the first slider 33 and the first slide rail 21, so as to prevent the adapter 30 from getting stuck during the movement and ensure the smoothness and reliability of the backrest 200 adjustment process.

[0073] In an optional embodiment, the adapter assembly 30 includes an adapter 31 and a connector 32. The adapter 31 has an adapter shaft 311 at one end. One end of the connecting member 102 is rotatably connected to the adapter shaft 311, and the other end of the connecting member 102 is rotatably connected to the second rotating part 302. The connector 32 is connected between the adapter 31 and the first rack 12. The first slider 33 is disposed on the adapter 31, so that the adapter 31 can move along the guide direction of the first slide rail 21 under the drive of the connecting member 102, thereby driving the first rack 12 to slide away from or towards the rotating shaft 400, and then driving the gear assembly 11 to drive the second rack 13 to slide towards or away from the rotating shaft 400, so that the backrest 200 can slide on the support plate 20 towards or away from the rotating shaft 400.

[0074] In one optional embodiment, the support plate 20 is provided with a second slide rail 22, and the backrest 200 is provided with a second slider 202. The position of the second slider 202 corresponds to the position of the second slide rail 22. The backrest 200 is slidably connected to the support plate 20 through the cooperation of the second slider 202 and the second slide rail 22, so that the millimeter-level precise positioning of the lifting and lowering of the backrest 200 can be achieved through the cooperation of the high rigidity slide rail and the low friction slider.

[0075] In an optional embodiment, the backrest 200 is provided with a transmission part 201, which is fixedly connected to the second rack 13, so that the second rack 13 can drive the backrest 200 to slide in a direction closer to or away from the rotation axis 400 through the transmission part 201. The second slider 202 is disposed on both sides of the transmission part 201 to ensure the smoothness and stability of the backrest 200 during sliding.

[0076] In an optional embodiment, a groove structure 23 is formed on the support plate 20, and the gear assembly 11 is rotatably mounted in the groove structure 23. The first rack 12 and the second rack 13 are disposed on both sides of the gear assembly 11 and slidably mounted in the groove structure 23. This reduces the overall thickness of the support plate 20, making it suitable for space-constrained products such as wheelchairs. Furthermore, the mechanical constraint of the groove structure 23 enhances the stability of the first rack 12, the second rack 13, and the gear assembly 11 during transmission, ensuring the reliability of the backrest 200 during frequent adjustments.

[0077] In an optional embodiment, the support member 101 further includes a first guide rail 60 and a second guide rail 70, which are disposed in the groove structure 23. The first rack 12 is slidably mounted on the first guide rail 60, and the second rack 13 is slidably mounted on the second guide rail 70, so as to ensure that the first rack 12 and the second rack 13 slide smoothly in the groove structure 23, and also reduce the noise of the first rack 12 and the second rack 13 during the sliding process.

[0078] In an optional embodiment, the groove structure 23 includes a first groove 23a and a second groove 23b, and the gear assembly 11 includes a first gear 111 and a second gear 112. The second gear 112 is connected to the first gear 111. The first groove 23a is disposed on the front side of the support plate 20, and the second groove 23b is disposed on the back side of the support plate 20. The first gear 111 meshes with the first rack 12 and is disposed in the first groove 23a, and the second gear 112 meshes with the second rack 13 and is disposed in the second groove 23b. This arrangement achieves efficient integration of the transmission system through a three-dimensional spatial layout, and also facilitates subsequent maintenance of the transmission assembly 10.

[0079] In an optional embodiment, the gear assembly 11 includes a connecting shaft 114, a rotating hole 23c is provided between the first groove 23a and the second groove 23b, the connecting shaft 114 is rotatably installed in the rotating hole 23c, and the first gear 111 and the second gear 112 are disposed on the connecting shaft 114 to realize the power transmission between the first rack 12 and the second rack 13, and at the same time, the transmission accuracy can be ensured by the cooperation between the connecting shaft 114 and the rotating hole 23c.

[0080] In an optional embodiment, the gear assembly 11 further includes a locking member 115. The first gear 111 and the second gear 112 are connected by a key and mounted at both ends of the connecting shaft 114. The locking member 115 is disposed at both ends of the connecting shaft 114 to fix the first gear 111 and the second gear 112 to the connecting shaft 114, thereby reducing the axial wobble of the first gear 111 and the second gear 112 and reducing noise during the adjustment process.

[0081] In one alternative implementation, such as Figures 5 to 12 As shown, the support member 101 also includes a first cover plate 40 with a first opening 41. The first cover plate 40 is installed at the opening of the first groove 23a. One end of the connector 32 is connected to the adapter 31, and the other end of the connector 32 passes through the first opening 41 and is connected to the first rack 12, so as to integrate the first gear 111 and the first rack 12 in the sealed first groove 23a, preventing dust and other particles from entering the first groove 23a and extending the service life of the first gear 111 and the first rack 12. The connector 32 moves in the extension direction within the first opening 41 to ensure linear movement of the backrest 200.

[0082] In an optional embodiment, the support member 101 further includes a second cover plate 50 having a second opening 51. The second cover plate 50 is installed at the opening of the second groove 23b. The transmission part 201 of the backrest 200 passes through the second opening 51 and is connected to the second rack 13 to integrate the second gear 112 and the second rack 13 into the sealed second groove 23b, preventing dust and other contaminants from entering the second groove 23b and extending the service life of the second gear 112 and the second rack 13. The transmission part 201 moves in the extension direction within the second opening 51 to ensure linear movement of the backrest 200.

[0083] In one alternative implementation, such as Figures 14 to 22 As shown, the groove structure 23 includes a first groove 23d, a second groove 23e, and a third groove 23f. The first groove 23d and the second groove 23e are disposed on both sides of the third groove 23f and extend along the sliding direction of the backrest 200. The first rack 12 is slidably installed in the first groove 23d and connected to the adapter assembly 30. The second rack 13 is slidably installed in the second groove 23e. The gear assembly 11 is rotatably installed in the third groove 23f and meshes with the first rack 12 and the second gear 112. Through the multi-stage groove structure and the precise cooperation of the first rack 12, the second rack 13, and the gear assembly 11, the stable operation of the adjustment transmission system is achieved.

[0084] In one alternative implementation, such as Figures 14 to 18 As shown, the first recess 23d, the second recess 23e, and the third recess 23f are all formed on one end face of the support plate 20. The adapter assembly 30 is connected to the first rack 12 in the first recess 23d, enabling the adapter assembly 30 to drive the first rack 12 to move along the extension direction. The transmission part 201 of the backrest 200 is connected to the second rack 13 in the second recess 23e, enabling the second rack 13 to drive the backrest 200 to move along the extension direction, thereby ensuring that the first rack 12 can drive the second rack 13 and the backrest 200 connected to the second rack 13 to perform linear motion through the gear assembly 11. It should be noted that the end face refers to the front and back faces of the support plate 20.

[0085] For example, a first sinker 23d, a second sinker 23e, and a third sinker 23f are formed on the front side of the support plate 20. The bottom of the first sinker 23d is provided with a groove 231 that connects to the back side of the support plate 20. At least a portion of the adapter 30 passes through the groove 231 and connects to the first rack 12. Specifically, one end of the connector 32 can connect to the adapter 31, and the other end of the connector 32 can pass through the groove 231 and connect to the first rack 12. The second sinker 23e can connect to the back side of the support plate 20 or be isolated from the back side of the support plate 20; this application does not impose any limitations on this.

[0086] For example, when the first sinker 23d, the second sinker 23e, and the third sinker 23f are formed on the back of the support plate 20, the bottom of the second sinker 23e has a groove 231 that connects to the front of the support plate 20. The transmission part 201 of the backrest 200 passes through the groove 231 and connects with the second rack 13, so that the transmission part 201 of the backrest 200 can pass through the second sinker 23e and connect with the second rack 13, thereby driving the backrest 200 to move in the extension direction. This application does not limit this.

[0087] In an optional embodiment, the gear assembly 11 includes a first gear 111, a second gear 112, and a connecting shaft 114. The first gear 111 and the second gear 112 are disposed on the connecting shaft 114, which is rotatably mounted in a third recess 23f. The first gear 111 meshes with a first rack 12, and the second gear 112 meshes with another gear 112, so that bidirectional power transmission between the first gear 111 and the second gear 112 can be achieved through the precise engagement of the first recess 23d, the second recess 23e, and the third recess 23f.

[0088] In an alternative embodiment, the diameter of the first gear 111 is smaller than the diameter of the second gear 112, so that the sliding speed of the backrest 200 is lower than the angle change between the support plate 20 and the seat 300 or the mounting base 300a, thereby improving the fineness of adjustment.

[0089] It should be noted that in all the above embodiments, at least two of the first gear 111, the second gear 112 and the connecting shaft 114 are integrally formed, and this application does not limit this.

[0090] In one alternative implementation, such as Figures 19 to 22As shown, the gear assembly 11 includes a third gear 113, which is rotatably mounted in the groove structure 23 and meshes with the first rack 12 and the second rack 13. This allows the third gear 113 to serve as the conversion center for the movement of the first rack 12 and the second rack 13, ensuring the opposite movement of the first rack 12 and the second rack 13. This allows the linear sliding of the backrest 200 to be coupled with the rotation angle of the support plate 20.

[0091] It is worth mentioning that, in the embodiments of this application, the gear assembly 11 may include only one gear or two coaxial gears, or it may include more than three gears, as long as the gear assembly 11 can realize the reversal between the first rack 12 and the second rack 13. There is no specific limitation on the number of gears.

[0092] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, 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 communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0093] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0094] The foregoing disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described above. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0095] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A wheelchair, characterized in that, include: Seats; Backrest; An adjustment structure is provided, comprising a mounting base and a support member, wherein the mounting base is connected to the seat and the support member is rotatably connected to the mounting base. The adjustment structure further includes a connecting component. The supporting component includes a supporting plate, a first rack, a second rack, a gear assembly, and a transition assembly. The mounting base is provided with a first rotating part and a second rotating part. The first rack, the second rack, and the gear assembly are disposed on the supporting plate. The supporting plate is rotatably connected to the first rotating part via a rotating shaft. The connecting component is connected between the second rotating part and the transition assembly. The transition assembly is connected to the first rack. The backrest is slidably connected to the front of the supporting plate. The backrest is connected to the second rack. The first rack is meshed with the gear assembly, and the gear assembly is meshed with the second rack. When the angle between the support plate and the seat increases, the backrest slides on the support plate toward the direction of rotation; when the angle between the support plate and the seat decreases, the backrest slides on the support plate away from the direction of rotation. When the angle between the support plate and the seat increases, the support plate rotates relative to the seat around the first rotating part. During the rotation, the connecting member pushes the adapter assembly to slide away from the rotating axis. The adapter assembly drives the first rack to slide away from the rotating axis, so that the first rack can drive the second rack to slide towards the rotating axis through the gear assembly. This, in turn, drives the backrest connected to the second rack to slide towards the rotating axis on the support plate.

2. The wheelchair according to claim 1, characterized in that, The support plate has a groove structure, the gear assembly is rotatably mounted in the groove structure, and the first rack and the second rack are disposed on both sides of the gear assembly and slidably mounted in the groove structure.

3. The wheelchair according to claim 2, characterized in that, The groove structure includes a first groove and a second groove. The gear assembly includes a first gear and a second gear. The first gear is connected to the second gear. The first gear and the second gear rotate synchronously. The first groove is disposed on the front side of the support plate, and the second groove is disposed on the back side of the support plate. The first gear meshes with the first rack and is disposed in the first groove. The second gear meshes with the second rack and is disposed in the second groove.

4. The wheelchair according to claim 3, characterized in that, The gear assembly includes a connecting shaft, a rotating hole is provided between the first groove and the second groove, the connecting shaft is rotatably installed in the rotating hole, and the first gear and the second gear are disposed on the connecting shaft.

5. The wheelchair according to claim 2, characterized in that, The groove structure includes a first groove, a second groove, and a third groove. The first groove is connected to the second groove through the third groove. The first groove and the second groove are located on opposite sides of the third groove and extend along the sliding direction of the backrest. The first rack is slidably installed in the first groove, the second rack is slidably installed in the second groove, and the gear assembly is rotatably installed in the third groove.

6. The wheelchair according to claim 5, characterized in that, The first, second, and third recesses are all formed on the front side of the support plate. The bottom of the first recess has a groove communicating with the back side of the support plate. At least a portion of the adapter assembly passes through the groove and connects to the first rack; or, The first, second, and third recesses are all formed on the back of the support plate. The bottom of the second recess has a groove that connects to the front of the support plate. The transmission part of the backrest passes through the groove and connects to the second rack.

7. The wheelchair according to claim 6, characterized in that, The gear assembly includes a first gear, a second gear, and a connecting shaft. The first gear and the second gear are disposed on the connecting shaft and rotate synchronously. The connecting shaft is rotatably mounted on the third recess. The first gear meshes with the first rack, and the second gear meshes with the second rack.

8. The wheelchair according to claim 3 or 7, characterized in that, The diameter of the first gear is smaller than the diameter of the second gear.

9. The wheelchair according to claim 2, characterized in that, The gear assembly includes a third gear, which is rotatably mounted in the groove structure and meshes with the first rack and the second rack.

10. The wheelchair according to claim 1, characterized in that, The support plate is provided with a first slide rail, and the adapter assembly is provided with a first slider. The position of the first slider corresponds to the position of the first slide rail. The adapter assembly is slidably connected to the support plate through the cooperation of the first slider and the first slide rail; and / or, The support plate is provided with a second slide rail, and the backrest is provided with a second slider. The position of the second slider corresponds to the position of the second slide rail, and the backrest is slidably connected to the support plate through the cooperation of the second slider and the second slide rail.

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