Wheelchair armrest structure

Abstract

The utility model relates to wheelchair handrail technical field especially wheelchair handrail structure, its technical scheme includes wheelchair framework, support structure, handrail and placing board no.

Description

Technical Field

[0001] This application relates to the field of wheelchair armrest technology, and in particular to wheelchair armrest structures. Background Technology

[0002] As an important rehabilitation and mobility aid, the design of wheelchairs directly impacts the user's comfort and quality of life. Armrests, a key component of wheelchairs, not only provide arm support but also serve as essential functional parts for carrying items and assisting in getting up. With technological advancements, users' expectations for wheelchair armrests have transcended basic support functions, demanding higher levels of adjustability, functional expandability, and ease of use. Users hope for flexible adjustments and usage options tailored to their body type and specific needs.

[0003] Currently, most wheelchair armrest structures on the market adjust height by creating several positioning holes on a fixed support rod. A limited number of height settings are achieved by inserting pins into these holes. For adding a tabletop, a simple hinged tabletop or two separate panels are typically used, which are manually aligned and secured with individual clips or knobs when needed.

[0004] However, the aforementioned existing technical solutions have significant shortcomings in practical use. In particular, the process of adjusting the height of the armrest is quite inconvenient. Users need to first laboriously pull out the pin, then lift or lower the armrest to align it with another positioning hole, and finally reinsert the pin. This series of operations is quite difficult for users with insufficient upper limb strength or poor coordination, making it impossible to achieve smooth, stepless, and precise adjustments, which greatly affects the convenience and user experience. Utility Model Content

[0005] The purpose of this application is to provide a wheelchair armrest structure to improve the shortcomings of traditional wheelchair armrest structures, which cannot achieve smooth, stepless, and fine adjustment, thus greatly affecting the convenience of use and user experience.

[0006] The wheelchair armrest structure provided in this application adopts the following technical solution: The wheelchair armrest structure includes the wheelchair frame and also includes: The support structure is located on both sides of the wheelchair frame and connects the armrests to the seat back of the wheelchair frame. The support structure includes a lockable pivot one and a lockable pivot two. The lockable pivot one and the lockable pivot two are respectively installed on both sides of the wheelchair frame seat back frame. An extension column is installed on the outer wall of both the lockable pivot one and the lockable pivot two. An armrest bracket slides on the outer wall of the extension column and is installed with the armrest. A fixing mechanism is provided on the outer wall of the armrest bracket. Placement plate one and placement plate two are mounted on the outer walls of the handrails on both sides by hinges, and a connecting mechanism is provided between placement plate one and placement plate two.

[0007] By adopting the above technical solution, the support structure is mounted on the wheelchair frame via two lockable pivots, providing not only a fulcrum for the armrests to rotate relative to the seat and backrest, but also a built-in locking function that secures the armrests after adjustment to a suitable angle, preventing accidental rotation. The extension column, fixed to the pivot, acts as a vertical guide, allowing the armrest support, along with the armrests, to slide up and down along the outer wall of the extension column, thus achieving armrest height adjustment. A fixing mechanism located on the outer wall of the armrest support locks the relative position of the armrest support and the extension column after height adjustment. Furthermore, placement plates one and two are hinged to the outer wall of the armrest, allowing them to be flipped upwards to unfold or downwards to fold away.

[0008] Optionally, the connecting mechanism includes a fixed block that can slide inside the first placement plate and the second placement plate. A limit plate is fixed to the outer wall of the fixed block. A spring is provided between the fixed block and the second placement plate, and a sliding shaft that can slide inside the second placement plate is provided inside the spring.

[0009] By adopting the above technical solution, the fixing block is constrained in the internal cavity of the first and second placement plates and can slide along a specific trajectory. The limiting plate fixed on the outer wall of the fixing block is mainly used to limit its sliding stroke and prevent it from falling out. The spring continuously applies an elastic force to the fixing block, making it tend to move in the direction of the first placement plate. The sliding shaft set inside the spring guides the spring on the one hand to prevent it from bending when compressed or extended; on the other hand, the sliding shaft itself also slides inside the second placement plate, increasing the stability of the entire moving part.

[0010] Optionally, a triangular push plate is fixed to the lower side of the outer wall of the limiting plate, and is driven by the movement of the first placement plate, while sliding inside the second placement plate.

[0011] By adopting the above technical solution, when the first placement plate moves closer to the second placement plate, the edge of the first placement plate will first contact the inclined surface of the triangular push plate. As it continues to move forward, the geometric characteristics of the inclined surface will convert the horizontal thrust into a vertical component force, thereby driving the triangular push plate together with the fixing block to overcome the elastic force of the spring and slide downward inside the second placement plate, making room for the fixing block to finally lock into the first placement plate.

[0012] Optionally, an L-shaped push plate is slidably mounted inside the placement plate, and the L-shaped push plate can contact and drive the fixing block.

[0013] By adopting the above technical solution, when it is necessary to separate the placement plates, the user slides the L-shaped push plate. Its specific shape design allows its end to directly contact and push the already engaged fixing block. By applying pressure, the L-shaped push plate forces the fixing block out of the slot of placement plate one and retracts into placement plate two, thereby releasing the lock on placement plate one and realizing the separation of the two plates.

[0014] Optionally, one end of the spring is fixed to the inner wall of the second placement plate, and the other end is fixed to one side of the outer wall of the second placement plate.

[0015] By adopting the above technical solution, the installation method of the spring determines its reliability. One end is fixed to the inner wall of the second placement plate, while the other end acts on the fixed block or the component connected to it, ensuring that the spring force can be effectively and directionally transmitted to the fixed block during compression and rebound, driving it to perform locking or resetting actions, and providing a stable and continuous driving force for the automatic locking and manual disengagement of the connecting mechanism.

[0016] Optionally, the fixing mechanism includes a threaded sleeve fixed to one side of the outer wall of the handrail bracket, and the threaded sleeve is provided with a bolt that matches its internal thread.

[0017] By adopting the above technical solution, when the bolt is rotated, it moves axially inside the threaded sleeve. When tightened clockwise, the bolt rotates towards the extension column, and its end finally presses tightly against the outer wall of the extension column. Through the huge static friction force generated, the handrail bracket and the extension column are locked together, thereby achieving a high degree of fixation.

[0018] Optionally, an anti-slip fixing shaft is installed on one side of the outer wall of the bolt, and the anti-slip fixing shaft can limit the extension column.

[0019] By adopting the above technical solution, when the bolt is tightened, the anti-slip fixing shaft is pushed against the outer wall of the extension column. Its anti-slip characteristics enable it to generate greater friction than a smooth surface under the same tightening torque, thereby significantly enhancing the limiting ability of the extension column and effectively preventing the handrail bracket from sliding or loosening after locking.

[0020] Optionally, a wheelchair seat cushion is provided in the middle of the wheelchair frame, and a wheelchair backrest is provided at the rear.

[0021] By adopting the above technical solutions, the wheelchair seat and backrest are the core functional components on the wheelchair frame that directly support the user, together forming an ergonomic seating system that provides users with stable support and a comfortable sitting or lying experience.

[0022] In summary, this application has at least the following beneficial effects: 1. This utility model achieves stepless and smooth adjustment of the handrail height through the sliding handrail bracket and threaded fastening mechanism. Users only need to turn the bolts to complete the entire process of loosening, adjusting and locking, which is simple and labor-saving and significantly improves the convenience and accuracy of adjustment. 2. This utility model, through its designed automatic locking connection mechanism driven by a spring and guided by an inclined plane, achieves rapid and automatic alignment and locking of the first and second placement plates when unfolded, ensuring the flatness and stability of the connection and avoiding the tedious manual alignment and operation of the buckles in the traditional method. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the wheelchair armrest; Figure 2 This is a schematic diagram of the handrail structure; Figure 3 This is a schematic diagram of the handrail support structure; Figure 4 This is a schematic diagram of the placement plate structure; Figure 5 yes Figure 4 Schematic diagram of the structure at point A in the middle; Figure 6 This is a schematic diagram of the fixed card block structure.

[0024] In the diagram: 1. Wheelchair frame; 2. Wheelchair seat; 3. Wheelchair backrest; 4. Lockable pivot one; 5. Lockable pivot two; 6. Extension column; 7. Armrest bracket; 8. Threaded sleeve; 9. Bolt; 10. Anti-slip fixing shaft; 11. Armrest; 12. Hinge; 13. Placement plate one; 14. Placement plate two; 15. L-shaped push plate; 16. Fixing block; 17. Limiting plate; 18. Triangular push plate; 19. Sliding shaft; 20. Spring. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1 - Appendix Figure 6 This application will be described in further detail below.

[0026] like Figures 1-3 As shown, the wheelchair armrest structure proposed in this utility model includes a wheelchair frame 1; in one embodiment, a wheelchair seat cushion 2 is provided in the middle of the wheelchair frame 1, and a wheelchair backrest 3 is provided at the rear. Placement plate 13 and placement plate 2 are mounted on the outer walls of the handrails 11 on both sides via hinges 12. The handrail structure is described in detail below: In this embodiment, the wheelchair frame 1 serves as the core support structure, with a wheelchair seat cushion 2 fixed in its middle and a wheelchair backrest 3 installed at the rear, together forming the user's sitting and lying base. Placement board one 13 and placement board two 14 are hinged to the outer walls of the side armrests 11 via hinges 12. The hinges 12 allow placement board one 13 and placement board two 14 to rotate around an axis, thereby enabling the placement boards to unfold or fold. When the user needs to place items, placement board one 13 and placement board two 14 can be unfolded horizontally to form a continuous plane; when not needed, they can be folded away via the hinges 12 to save space. Placement board one 13 and placement board two 14 are linked together through a connecting mechanism to ensure stability in the unfolded state and prevent accidental folding due to external forces.

[0027] like Figures 1-3 As shown, the armrest structure also includes a bracket structure disposed on both sides of the wheelchair frame 1 and connecting the armrest 11 to the seat back frame of the wheelchair frame 1; in one embodiment, the bracket structure includes a lockable pivot 4 and a lockable pivot 5, which are respectively installed on both sides of the seat back frame of the wheelchair frame 1. An extension column 6 is installed on the outer wall of both the lockable pivot 4 and the lockable pivot 5. An armrest bracket 7 slides on the outer wall of the extension column 6 and is installed with the armrest 11. A fixing mechanism is provided on the outer wall of the armrest bracket 7. The fixing mechanism includes a threaded sleeve 8 fixed to one side of the outer wall of the handrail bracket 7, and a bolt 9 that matches the internal thread of the threaded sleeve 8; an anti-slip fixing shaft 10 is installed on one side of the outer wall of the bolt 9, and the anti-slip fixing shaft 10 can limit the extension column 6. The bracket structure is described in detail below: In this embodiment, the height and position of the armrest 11 are adjusted through a bracket structure and a fixing mechanism to meet the needs of different users. The bracket structure includes a lockable pivot 4 and a lockable pivot 5, which are respectively installed on both sides of the seat back of the wheelchair frame 1, acting as pivots to allow the armrest 11 to rotate or move within a certain range. Both the lockable pivot 4 and the lockable pivot 5 have extension columns 6 fixed to their outer walls. The outer wall of the extension column 6 is slidably connected to the armrest bracket 7. The armrest bracket 7 is finally installed with the armrest 11, so that the armrest 11 can move axially along the extension column 6, thereby achieving height adjustment. The fixing mechanism is used to lock the position of the armrest 11: a threaded sleeve 8 is fixed to the outer wall of the armrest bracket 7, and a bolt 9 is screwed into the threaded sleeve 8. When adjusted to a suitable position, rotating the bolt 9 will cause the anti-slip fixing shaft 10 on one side of its outer wall to press against the outer wall of the extension column 6, achieving limitation and fixation through friction. The anti-slip fixing shaft 10 design enhances the roughness of the contact surface, prevents slippage, and ensures that the handrail 11 remains stable during use. The height of the handrail 11 can be easily adjusted according to one's own height or posture, and it can be quickly fixed by tightening the bolts 9, avoiding the trouble of frequent disassembly in traditional structures.

[0028] like Figures 1-6 As shown, the handrail structure also includes a connecting mechanism disposed between the first placement plate 13 and the second placement plate 14; in one embodiment, the connecting mechanism includes a fixing block 16 that can slide inside the first placement plate 13 and the second placement plate 14, a limit plate 17 is fixed to the outer wall of the fixing block 16, a spring 20 is disposed between the fixing block 16 and the second placement plate 14, and a sliding shaft 19 that can slide inside the second placement plate 14 is disposed inside the spring 20; A triangular push plate 18 is fixed to the lower side of the outer wall of the limiting plate 17, and is driven by the movement of the first placement plate 13, while sliding inside the second placement plate 14; an L-shaped push plate 15 slides inside the first placement plate 13, and the L-shaped push plate 15 can contact and drive the fixing block 16; one end of the spring 20 is fixed to the inner wall of the second placement plate 14, and the other end is fixed to one side of the outer wall of the second placement plate 14. The connection mechanism is described in detail below: In this embodiment, when placement plate 13 and placement plate 24 need to be connected, placement plate 24 is first laid flat, and then placement plate 13 is moved so that it contacts the inclined surface of the triangular push plate 18. Placement plate 13 then pushes the triangular push plate 18 towards placement plate 24. The movement of the triangular push plate 18 causes the fixing block 16 and the limiting plate 17 to slide inside placement plate 24, thus returning the fixing block 16 to the inside of placement plate 24. Simultaneously, the movement of the fixing block 16 causes the spring 20 to contract, allowing placement plate 13 to move parallel to placement plate 24. When placement plate 13 and placement plate 24 are fully in contact, the triangular push plate 18 is no longer compressed, thus allowing the spring 20 to... Spring 20 rebounds and pushes the fixing block 16 to move into the placement plate 13. At the same time, the triangular push plate 18 moves to the lower surface of the placement plate 13 and fits against it, preventing the connection between the placement plate 13 and the placement plate 2 14 from loosening. This achieves automatic connection and fixation between the placement plate 13 and the placement plate 2 14. When disassembly is required, simply slide the L-shaped push plate 15 inside the placement plate 13. At this time, the L-shaped push plate 15 will apply pressure to the fixing block 16, causing the fixing block 16 to return to the placement plate 2 14. Meanwhile, the triangular push plate 18 is driven by the limiting plate 17 to release the limiting on the placement plate 13, thereby releasing the connection. This ensures the firmness of the placement plate 13 and the placement plate 2 14 in the connected state and simplifies the disassembly and assembly operations.

[0029] Specifically, the wheelchair frame 1 forms the main framework of the entire structure, supporting the wheelchair seat 2 and backrest 3, providing a stable base for the user. The armrests 11 on both sides not only support the user's arms but also serve as platforms for functional expansion. Placement board 13 and placement board 2 14 are hinged to the outside of the armrests 11 on both sides via hinges 12. This hinge 12 structure is the hub for the functional transformation of the placement boards: when it is necessary to place items such as plates or books, the user can manually rotate placement board 13 and placement board 2 14 from the side of the armrest 11 to a horizontal position; after use, they can be flipped down and folded up to fit snugly against the side of the armrest 11, greatly saving space and avoiding the inconvenience of passing through narrow passages.

[0030] To meet the personalized needs of different users, the armrest 11 features height adjustment. Lockable pivot 4 and 5, installed at the connection between the wheelchair frame 1 seat and backrest, provide initial mounting points. The extension column 6, fixed to the lockable pivots, extends vertically upwards, while the armrest bracket 7 is fitted over the extension column 6 and can slide along its axial direction, thereby raising and lowering the armrest 11. Once the armrest 11 is adjusted to the desired height, it is locked using a fixing mechanism on the armrest bracket 7. Rotating the bolt 9 pushes it inwards into the threaded sleeve 8, causing the anti-slip fixing shaft 10 at its end to press tightly against the smooth outer wall of the extension column 6. The resulting high friction effectively restricts the relative movement between the armrest bracket 7 and the extension column 6, thus securely locking the armrest 11 at the current height, ensuring stability and safety during use.

[0031] After both placement plates 13 and 14 are rotated to a horizontal position via hinge 12, they need to form a unified platform through a connecting mechanism. When pushing placement plate 13 towards placement plate 14, the inner edge of placement plate 13 will first contact the inclined surface of the triangular push plate 18. As pushing continues, the inclined surface converts the horizontal thrust into a vertical component, driving the triangular push plate 18, along with the fixing block 16 and the limiting plate 17, to compress the spring 20, causing the entire assembly to slide downward within the internal cavity of placement plate 14. At this time, the spring 20 accumulates elastic potential energy. When placement plate 13 and placement plate 14 are fully aligned and in contact, the corresponding slot of the fixing block 16 on placement plate 13 is no longer obstructed. The energy-accumulated spring 20 immediately pushes the fixing block 16 upward to reset, causing it to engage in the slot of placement plate 13. Simultaneously, the upper surface of the triangular push plate 18, which is linked to the fixing block 16, also fits tightly against the lower surface of placement plate 13, forming a second layer of limiting. Automatic locking is achieved when the two placement plates are connected, ensuring the flatness and stability of the tabletop. When it is necessary to separate the placement plates, simply slide the L-shaped push plate 15 on one side of placement plate 13. The lower end of the L-shaped push plate 15 directly acts on the fixing block 16, pushing it away from the slot and compressing the spring 20. The locking state is then released, and the two placement plates can be easily separated and folded away.

[0032] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A wheelchair armrest structure, comprising a wheelchair frame (1), characterized in that, Also includes: The support structure is set on both sides of the wheelchair frame (1) and connects the armrests (11) to the seat back of the wheelchair frame (1); The support structure includes a lockable pivot one (4) and a lockable pivot two (5). The lockable pivot one (4) and the lockable pivot two (5) are respectively installed on both sides of the seat back of the wheelchair frame (1). An extension column (6) is installed on the outer wall of both the lockable pivot one (4) and the lockable pivot two (5). An armrest bracket (7) slides on the outer wall of the extension column (6) and is installed with the armrest (11). A fixing mechanism is provided on the outer wall of the armrest bracket (7). Placement plate one (13) and placement plate two (14) are installed on the outer walls of the handrails (11) on both sides by hinges (12) on both sides. A connecting mechanism is provided between placement plate one (13) and placement plate two (14).

2. The wheelchair armrest structure according to claim 1, characterized in that, The connecting mechanism includes a fixed block (16) that can slide inside the first placement plate (13) and the second placement plate (14). A limit plate (17) is fixed to the outer wall of the fixed block (16). A spring (20) is provided between the fixed block (16) and the second placement plate (14), and a sliding shaft (19) that can slide inside the second placement plate (14) is provided inside the spring (20).

3. The wheelchair armrest structure according to claim 2, characterized in that, The lower side of the outer wall of the limiting plate (17) is fixed with a triangular push plate (18), which is driven by the movement of the placement plate one (13) and slides inside the placement plate two (14).

4. The wheelchair armrest structure according to claim 3, characterized in that, An L-shaped push plate (15) slides inside the placement plate (13), and the L-shaped push plate (15) can contact and drive the fixing block (16).

5. The wheelchair armrest structure according to claim 4, characterized in that, One end of the spring (20) is fixed to the inner wall of the second placement plate (14), and the other end is fixed to one side of the outer wall of the second placement plate (14).

6. The wheelchair armrest structure according to claim 1, characterized in that, The fixing mechanism includes a threaded sleeve (8) fixed to one side of the outer wall of the handrail bracket (7), and the threaded sleeve (8) is provided with a bolt (9) that matches its internal thread.

7. The wheelchair armrest structure according to claim 6, characterized in that, The bolt (9) has an anti-slip fixing shaft (10) installed on one side of its outer wall, and the anti-slip fixing shaft (10) can limit the extension column (6).

8. The wheelchair armrest structure according to claim 1, characterized in that, The wheelchair frame (1) has a wheelchair seat (2) in the middle and a wheelchair backrest (3) at the rear.

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