Adjustable structure and wheelchair

Abstract

The adjusting structure comprises a mounting base, a supporting member and a connecting member, the mounting base has a first rotating part and a second rotating part; the supporting member comprises a supporting plate and a transmission assembly, the supporting plate is rotatably connected to the first rotating part through a rotating shaft, the transmission assembly is installed on the supporting plate and is in transmission connection with a backrest installed on the supporting plate; one end of the connecting structure is in rotation connection with the transmission assembly, and the other end of the connecting structure is in rotation connection with the second rotating part; the transmission assembly comprises a first gear rack, a second gear rack, a gear assembly and an adapter assembly, a recess structure is formed on the supporting plate, the first gear rack, the second gear rack and the gear assembly are arranged in the recess structure, the connecting member is connected between the second rotating part and the adapter assembly, the adapter assembly is connected to the first gear rack, the second gear rack is connected to the backrest, the first gear rack is in meshing connection with the gear assembly, and the gear assembly is in meshing connection with the second gear rack.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to an adjusting structure and a wheelchair. BACKGROUND

[0002] A power wheelchair is an important tool for rehabilitation, which usually comprises a seat and a backrest, the backrest is generally directly connected with the seat and used for supporting the back of a user sitting on the seat. However, the backrest of the existing power wheelchair can only be adjusted in an inclination angle and cannot be adjusted in an extension distance relative to the seat. SUMMARY

[0003] The present application provides an adjusting structure and a wheelchair, which are designed to at least solve the technical problems existing in the prior art.

[0004] According to a first aspect of the present application, the present application provides an adjusting structure for adjusting a backrest of a wheelchair, the adjusting structure comprising:

[0005] a mounting base having a first rotating part and a second rotating part;

[0006] a support member comprising a support plate and a transmission assembly, the support plate being rotatably connected to the first rotating part through a rotating shaft, and the transmission assembly being installed on the support plate and used for being in transmission connection with a backrest installed on the support plate;

[0007] a coupling member, one end of the coupling member being in rotational connection with the transmission assembly, and the other end of the coupling member being in rotational connection with the second rotating part;

[0008] wherein the transmission assembly comprises a first rack, a second rack, a gear assembly and an adapter assembly, the support plate is formed with a groove structure, the first rack, the second rack and the gear assembly are arranged in the groove structure, the coupling member is connected between the second rotating part and the adapter assembly, the adapter assembly is connected to the first rack, the second rack is connected to the backrest, the first rack is in meshing connection with the gear assembly, and the gear assembly is in meshing connection with the second rack, so that the position of the backrest relative to the support plate can be controlled through the included angle between the support plate and the mounting base.

[0009] In the adjusting structure of the embodiment of the present application, the adapter assembly comprises an adapter and a connecting piece, an end of the adapter is provided with an adapter shaft, one end of the coupling member is in rotational connection with the adapter shaft, and the connecting piece is connected between the adapter and the first rack.

[0010] In the adjusting structure of one embodiment of the present application, the groove structure comprises a first groove and a second groove, the gear assembly comprises a first gear and a second gear, the first gear is connected with the second gear, the first gear and the second gear rotate synchronously, the first groove is arranged on the front surface of the support plate, the second groove is arranged on the back surface of the support plate, the first gear is engaged with the first rack and arranged in the first groove, and the second gear is engaged with the second rack and arranged in the second groove.

[0011] In the adjusting structure of one embodiment of the present application, the support member further comprises a first cover plate with a first opening, the first cover plate is mounted at the opening of the first groove, one end of the connecting member is connected with the adapter, and the other end of the connecting member is connected with the first rack after passing through the first opening; and / or,

[0012] The support member further comprises a second cover plate with a second opening, the second cover plate is mounted at the opening of the second groove, and the transmission part of the backrest is connected with the second rack after passing through the second opening.

[0013] In the adjusting structure of one embodiment of the present application, the gear assembly comprises a connecting shaft, a rotating hole is arranged 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 arranged on the connecting shaft.

[0014] In the adjusting structure of one embodiment of the present application, the groove structure comprises a first groove, a second groove and a third groove, the first groove is communicated with the second groove through the third groove, the first groove and the second groove are arranged on opposite sides of the third groove and extend along the sliding direction of the backrest, the first rack is slidingly mounted in the first groove, the second rack is slidingly mounted in the second groove, and the gear assembly is rotatably mounted in the third groove.

[0015] In the adjusting structure of one embodiment of the present application, the first groove, the second groove and the third groove are all formed on the front surface of the support plate, the bottom of the first groove has a sliding groove communicating with the other end surface of the support plate, and at least part of the adapter is connected with the first rack after passing through the sliding groove; or,

[0016] The first groove, the second groove and the third groove are all formed on the back surface of the support plate, the bottom of the second groove has a sliding groove communicating with the front surface of the support plate, and the transmission part of the backrest is connected with the second rack after passing through the sliding groove.

[0017] In the adjusting structure of the embodiment of the present application, the gear assembly comprises a first gear, a second gear and a connecting shaft, the first gear and the second gear are arranged on the connecting shaft, the first gear and the second gear rotate synchronously, the connecting shaft is rotatably arranged in the third groove, the first gear is engaged with the first rack, and the second gear is engaged with the second rack.

[0018] In the adjusting structure of the embodiment of the present application, the gear assembly comprises a third gear, the third gear is rotatably arranged in the groove structure and engaged with the first rack and the second rack.

[0019] According to the second aspect of the present application, the present application further provides a wheelchair device, comprising a seat, a backrest and the adjusting structure, the mounting base is connected to the seat, the backrest is slidingly connected to the front surface of the support plate, and the backrest is drivingly connected to the transmission assembly, so that the backrest can slide on the support plate towards the first rotating part or away from the first rotating part through the change of the angle between the support plate and the seat.

[0020] The technical scheme provided by the embodiment of the present application can have the following beneficial effects: the present application designs an adjusting structure and a wheelchair, the adjusting structure comprises a mounting base, a support member and a connecting member, the mounting base has a first rotating part and a second rotating part; the support member comprises a support plate and a transmission assembly, the transmission assembly comprises a first rack, a second rack, a gear assembly and an adapter assembly, the support plate is rotatably connected to the first rotating part through a rotating shaft, the first rack, the second rack and the gear assembly are arranged in a groove structure of the support plate, the connecting member is connected between the second rotating part and the adapter assembly, the adapter assembly is connected to the first rack, the second rack is connected to the backrest, and the gear assembly is drivingly connected to the first rack and the second rack, so as to drive the adapter assembly to slide the first rack towards or away from the rotating shaft through the connecting member, so that the first rack can drive the backrest to slide through the gear assembly driving the second rack, realize ergonomic adaptation, and the backrest can be stretched and adjusted.

[0021] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings required in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0023] Figure 1Figure 1 is a partial structural schematic view of a wheelchair according to an embodiment of the present application;

[0024] Figure 2 Figure 2 is a partial structural schematic view of the wheelchair in Figure 1 from another angle; Figure 1

[0025] Figure 3 Figure 3 is a partial exploded schematic view of the wheelchair in Figure 1; Figure 1

[0026] Figure 4 Figure 4 is a structural schematic view of a seat in Figure 1; Figure 1

[0027] Figure 5 Figure 5 is an exploded schematic view of a backrest and adjustment structure in Figure 1; Figure 1

[0028] Figure 6 Figure 6 is a structural schematic view of the backrest in Figure 1; Figure 5

[0029] Figure 7 Figure 7 is an exploded schematic view of the adjustment structure in Figure 1; Figure 5

[0030] Figure 8 Figure 8 is a cross-sectional schematic view of the adjustment structure in Figure 1; Figure 5

[0031] Figure 9 Figure 9 is a structural schematic view of a switching assembly in Figure 1; Figure 5

[0032] Figure 10 Figure 10 is a partial schematic view of the adjustment structure in Figure 1; Figure 5

[0033] Figure 11 Figure 11 is a schematic view of the adjustment structure in Figure 1 from another angle; Figure 10

[0034] Figure 12 Figure 12 is a structural schematic view of a support plate in Figure 1; Figure 7

[0035] Figure 13 Figure 13 is an exploded schematic view of a gear assembly in Figure 1; Figure 7

[0036] Figure 14 Figure 14 is a structural schematic view of an adjustment structure according to another embodiment of the present application;

[0037] Figure 15 Figure 15 is a cross-sectional schematic view of the adjustment structure in Figure 14; Figure 13

[0038] Figure 16 Figure 16 is a structural schematic view of an adjustment structure according to yet another embodiment of the present application;​​​​​​​​​​​​​Figure 13 A schematic diagram of the decomposed adjustment structure in the diagram;

[0039] Figure 17 yes Figure 16 A schematic diagram of the gear assembly in the diagram;

[0040] Figure 18 yes Figure 17 An exploded view of the gear assembly in the diagram;

[0041] Figure 19 This is a schematic diagram of the adjustment structure provided in another embodiment of this application;

[0042] Figure 20 yes Figure 19 A cross-sectional schematic diagram of the adjustment structure in the middle;

[0043] Figure 21 yes Figure 19 A schematic diagram of the decomposed adjustment structure in the diagram;

[0044] Figure 22 yes Figure 21 A schematic diagram of the gear assembly.

[0045] Explanation of reference numerals in the attached figures:

[0046] 100. Adjustment structure; 101. Supporting component; 102. Connecting component;

[0047] 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;

[0048] 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;

[0049] 30. Adapter assembly; 31. Adapter piece; 311. Adapter shaft; 32. Connector piece; 33. First slider;

[0050] 40. First cover plate; 41. First opening;

[0051] 50. Second cover plate; 51. Second opening;

[0052] 60. First guide rail component; 70. Second guide rail component;

[0053] 200. Backrest; 201. Transmission unit; 202. Second slider;

[0054] 300, Seat; 300a, Mounting base; 301, First rotating part; 302, Second rotating part;

[0055] 400. Rotating shaft. Detailed Implementation

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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 closer to the 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 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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. An adjustment structure for adjusting the backrest of a wheelchair, characterized in that, The adjustment structure includes: The mounting base has a first rotating part and a second rotating part; A support member, comprising a support plate and a transmission assembly, wherein the support plate is rotatably connected to the first rotating part via a rotating shaft, and the transmission assembly is mounted on the support plate for transmission connection with a backrest mounted on the support plate; A connecting member, one end of which is rotatably connected to the transmission assembly, and the other end of which is rotatably connected to the second rotating part; The transmission assembly includes a first rack, a second rack, a gear assembly, and a transition assembly. A groove structure is formed on the support plate. The first rack, the second rack, and the gear assembly are disposed in the groove structure. The connecting member connects the second rotating part and the transition assembly. The transition assembly is connected to the first rack, and the second rack is connected to the backrest. The first rack is meshed with the gear assembly, and the gear assembly is meshed with the second rack, so that the position of the backrest relative to the support plate can be controlled by the angle between the support plate and the mounting base.

2. The adjustment structure according to claim 1, characterized in that, The adapter assembly includes an adapter and a connector. The adapter has an adapter shaft at one end. One end of the connector is rotatably connected to the adapter shaft. The connector is connected between the adapter and the first rack.

3. The adjustment structure 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 adjustment structure according to claim 3, characterized in that, The support member further includes a first cover plate having a first opening, the first cover plate being installed at the opening of the first groove, one end of the connector being connected to the adapter, and the other end of the connector passing through the first opening and being connected to the first rack. And / or, The support member further includes a second cover plate having a second opening, the second cover plate being installed at the opening of the second groove, and the transmission part of the backrest passing through the second opening and connected to the second rack.

5. The adjustment structure 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.

6. The adjustment structure according to claim 3, 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.

7. The adjustment structure according to claim 6, 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.

8. The adjustment structure according to claim 7, 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.

9. The adjustment structure according to claim 1, 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. A wheelchair, characterized in that, The device includes a seat, a backrest, and an adjustment structure as described in any one of claims 1 to 9. The mounting base is connected to the seat, the backrest is slidably connected to the front of the support plate, and the backrest is drively connected to the transmission assembly, such that the backrest can slide on the support plate toward or away from the first rotating part by means of the angle change between the support plate and the seat.

Images