Adjustable wheelchair
The seat tilt angle is adjusted by using a sliding rail and sliding block mechanism. Combined with adjustment components and a modular structure, this solves the problem that traditional wheelchairs cannot adjust the seat tilt angle and headrest position, improving user comfort and wheelchair adaptability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUIZHOU KEFU IND CO LTD
- Filing Date
- 2025-04-25
- Publication Date
- 2026-04-17
AI Technical Summary
Traditional wheelchairs cannot adjust the seat tilt angle and headrest position, leading to user discomfort and poor usability, especially for users of different heights who cannot be properly fitted.
An adjustable wheelchair was designed, which achieves stepless adjustment of the seat tilt angle through a sliding rail and sliding block mechanism, and combines adjustment components to achieve adjustment of the headrest angle and height. It is also equipped with modular structures such as a retractable leg rest, folding side rests and rotating armrests.
It improves user comfort and wheelchair adaptability, reduces the risk of pressure sores, meets the needs of users of different heights, and enhances the functional applicability of wheelchairs.
Smart Images
Figure CN224126188U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of wheelchairs, and in particular to an adjustable wheelchair. Background Technology
[0002] A wheelchair is an assistive transportation tool designed for people with mobility impairments. It is primarily used to help those who are unable to walk independently due to physical disabilities, illnesses, or injuries to perform their daily activities.
[0003] Because wheelchair users spend long periods of time sitting in them, certain parts of their bodies are under pressure for extended periods, which can cause discomfort and pressure sores. If users want to lie down and rest, they can only do so on a bed, which is particularly inconvenient due to leg limitations. Furthermore, the headrest cannot be adjusted to change position while using the wheelchair, meaning it is not suitable for users of different heights, thus affecting the wheelchair's usability. Utility Model Content
[0004] The technical problem this utility model aims to solve is that when a user uses a wheelchair, the tilt angle of the seat cannot be changed, affecting the user's comfort. At the same time, it also addresses the issue that the headrest cannot be adjusted to change its position, resulting in the headrest not being suitable for users of different heights, thus affecting the effectiveness of wheelchair use.
[0005] The technical solution adopted by this utility model to solve its technical problem is: an adjustable wheelchair, including a main frame and a seating system. Casters are installed at the four corners of the bottom of the main frame. Bushings are provided on both sides of the main frame. A wheel axle is installed inside the bushing. A tire and a push ring are installed on the wheel axle. A brake is also installed on the main frame. Sliding mounting seats are fixedly installed on both sides of the main frame. The seating system is provided with a slide rail at the bottom. The slide rail is installed on the sliding mounting seat.
[0006] The sliding mounting base has a groove on its top, in which two pulleys are rotatably mounted. A slide rail is installed in the groove and slidably mounted on the outer surface of the pulleys. A limiting tooth is also fixedly installed on the inner side of the slide rail. A sliding locking mechanism is fixedly installed on the inner side of the sliding mounting base. The limiting tooth and the sliding locking mechanism are coupled together. A control handle is fixedly installed on the back of the seat system. A brake cable is connected to the control handle. The other end of the brake cable is connected to the sliding locking mechanism. By controlling the different tooth positions of the sliding locking mechanism and the limiting tooth through the control handle, different tilt angles of the seat system can be controlled.
[0007] The aforementioned components achieve the following effects: through the pulley coupling design of the sliding mounting base and the slide rail, the seat system can move smoothly in the horizontal direction. At the same time, the engagement control of the sliding block mechanism and the limiting teeth allows the user to quickly lock the seat tilt angle by operating the control handle with one hand, solving the problem that traditional wheelchair backrest adjustment requires two hands and the angle is fixed. This is especially suitable for the self-adjustment needs of patients with myasthenia gravis.
[0008] Preferably, the seat system has an adjustment assembly installed on the top of the backrest. The adjustment assembly includes a mounting block, a lifting rod, a first operating block, two rotating rods, a first connecting rod, a second operating block, a locking block, a second connecting rod, and a ball. The mounting block is detachably connected to the top crossbar of the backrest. The lifting rod moves inside the mounting block. The first operating block is located on one side of the mounting block to fix the lifting rod inside the mounting block. The two rotating rods are located at both ends of the first connecting rod and are respectively connected to the lifting rod and the second connecting rod. The second operating block is located on the side of the lifting rod and the second connecting rod near the rotating rod. The locking block is located on the side of the second operating block near the rotating rod. The ball is located on the side of the second connecting rod away from the rotating rod and is located inside the headrest.
[0009] The effects achieved by the above components are as follows: the adjustment component realizes the vertical lifting and lowering of the headrest and the adjustment of the forward / backward tilt angle through the linkage design of the lifting rod and the rotating rod. The cooperation between the locking block and the second operating block provides double locking to meet the personalized head support needs of patients with cervical spine injuries. At the same time, the modular installation block allows for quick disassembly and replacement to adapt to different headrest types.
[0010] Preferably, the seat system has two support rods rotatably mounted on the front side, and leg rests are fixedly mounted on the two support rods via connecting blocks. Retractable adjusting rods are respectively mounted on the front ends of the two support rods, and foot pedals are fixedly mounted on the adjusting rods.
[0011] The effect achieved by the above components is as follows: the leg rest, through the rotating hinge of the support rod and the telescopic structure of the adjustment rod, realizes the coordinated adjustment of the lower limb support length and angle, with a tilt angle of 0-60°. Combined with the seat tilting function of the previous solution, it forms a "zero gravity" position, effectively reducing ischial pressure and preventing pressure sores.
[0012] Preferably, the seat cushion of the seating system is foldably mounted with side supports on both sides via hinges, and the backrest of the seating system is foldably mounted with shoulder supports on both sides via hinges.
[0013] The effect achieved by the above components is that the side support and shoulder support adopt folding hinges and provide lateral support through physical limiting structure to prevent the user from tilting to the side.
[0014] Preferably, armrests are rotatably mounted on both sides of the seat back via rotating hinges.
[0015] The effects achieved by the above components are as follows: the rotating armrest adopts a 90° rotating hinge to realize the armrest height adaptation and horizontal unfolding / storage function. Together with the side support, it forms a multi-modal support interface to meet the arm support needs of users in scenarios such as moving, dining and so on, and reduce shoulder joint strain.
[0016] Preferably, one end of the sliding mounting base is provided with a limiting component, which includes a limiting rod and a control block. The limiting rod slides inside the sliding mounting base to limit the maximum displacement of the seating system, and the control block drives the limiting rod to move inside the sliding mounting base.
[0017] The effects achieved by the above components are as follows: the limiting assembly limits the maximum displacement of the seat to prevent excessive tilting by controlling the sliding of the limiting rod; the ratchet mechanism of the control block provides double protection to avoid structural instability caused by misoperation.
[0018] Preferably, the seat system floor mat has a U-shaped groove, and a toilet is fixedly installed below the U-shaped groove.
[0019] The aforementioned components achieve the following effects: the integrated design of the U-shaped groove and the concealed toilet allows for quick disassembly and switching between toilet functions, solving the hygiene problem of traditional wheelchairs requiring the installation of an additional bedpan; the soft sealing ring at the edge of the groove prevents liquid leakage, improving the convenience of life for long-term bedridden users.
[0020] In summary, the beneficial effects of this utility model are as follows:
[0021] (1) This utility model achieves stepless adjustment of the seat tilt angle by meshing control of the slide rail and the sliding block mechanism, combined with the extension and retraction of the leg support and the adjustment of the foot pedal angle, to form a zero-gravity sitting posture, which increases the user's comfort and effectively reduces ischial pressure and prevents pressure sores.
[0022] (2) By using the adjustment components, the angle and height of the headrest can be adjusted so that the head of users of different heights can be supported by the headrest, thereby improving the adaptability of the wheelchair and thus improving the use effect of the wheelchair. Attached Figure Description
[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0024] Figure 1 This is a three-dimensional structural diagram of the present invention;
[0025] Figure 2 This is a schematic diagram of the disassembled structure of the main frame and seat system of this utility model;
[0026] Figure 3This is a partial three-dimensional structural diagram of the sliding mounting base and slide rail of this utility model;
[0027] Figure 4 This is a rear three-dimensional structural diagram of the present invention.
[0028] Figure 5 This utility model Figure 4 A magnified view of a local location.
[0029] Figure 6 This utility model Figure 1 Enlarged view of point A.
[0030] Legend: 1. Body; 2. Main frame; 3. Seating system; 4. Casters; 5. Bushings; 6. Axles; 7. Tires; 8. Hand rings; 9. Brakes; 10. Sliding mounting base; 11. Slide rail; 12. Groove; 13. Pulley; 14. Limiting teeth; 15. Sliding locking mechanism; 16. Control handle; 17. Brake cable; 18. Adjustment assembly; 91. Mounting block; 92. Lifting rod; 93. 3. First operating block; 94. Two rotating rods; 95. First connecting rod; 96. Second operating block; 97. Locking block; 98. Second connecting rod; 99. Ball; 910. Headrest; 5. Support rod; 51. Leg rest; 6. Adjusting rod; 61. Foot pedal; 7. Side support; 71. Shoulder support; 8. Armrest; 14. Limiting assembly; 141. Limiting rod; 142. Control block; 22. U-shaped groove; 23. Toilet seat; Detailed Implementation
[0031] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.
[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0033] Please see Figures 1 to 6An adjustable wheelchair includes a main frame 1 and a seating system 2. Casters 11 are installed at the four corners of the bottom of the main frame 1. Bushings 12 are provided on both sides of the main frame 1. Axles 13 are fitted inside the bushings 12. Tires 130 and push rings 131 are installed on the axles 13. Brakes 15 are also installed on the main frame 1. Sliding mounting seats 17 are fixedly installed on both sides of the main frame 1. The seating system 2 is provided with a slide rail 20 at the bottom, and the slide rail 20 is mounted on the sliding mounting seats 17.
[0034] The top of the sliding mounting base 17 has a groove 170, in which two pulleys 171 are rotatably mounted. The slide rail 20 is installed in the groove 170 and slidably mounted on the outer surface of the pulleys 171. A limiting tooth 21 is also fixedly installed on the inner side of the slide rail 20. A sliding locking mechanism 172 is fixedly installed on the inner side of the sliding mounting base 17. The limiting tooth 21 and the sliding locking mechanism 172 are coupled together. A control handle 3 is fixedly installed on the back of the seat system 2. A brake cable 4 is connected to the control handle 3. The other end of the brake cable 4 is connected to the sliding locking mechanism 172. By controlling the different tooth positions of the sliding locking mechanism 172 and the limiting tooth 21 through the control handle 3, different tilt angles of the seat system can be controlled. The user pulls the control handle (3) with one hand, and releases the locking of the sliding block mechanism (172) and the limiting tooth (21) through the brake cable (4). The user then pushes the backrest to make the slide rail (20) slide along the pulley (171) to the target tilt angle (e.g., 30°). After releasing the control handle (3), the sliding block mechanism (172) automatically engages with the corresponding tooth of the limiting tooth (21), thus fixing the seat angle. One end of each of the two sliding mounting seats 17 is provided with a limiting component 14. The limiting component 14 includes a limiting rod 141 and a control block 142. The limiting rod 141 slides inside the sliding mounting seat 17 to limit the maximum displacement of the seat system 2. The control block 142 drives the limiting rod 141 to move inside the sliding mounting seat 17.
[0035] The seat system 2 has an adjustment assembly 9 installed on the top of the backrest. The adjustment assembly 9 includes a mounting block 91, a lifting rod 92, a first operating block 93, two rotating rods 94, a first connecting rod 95, a second operating block 96, a locking block 97, a second connecting rod 98, and a ball 99. The mounting block 91 is detachably connected to the top crossbar of the backrest. The lifting rod 92 moves inside the mounting block 91. The first operating block 93 is located on one side of the mounting block 91 to fix the lifting rod 92 inside the mounting block 91. The two rotating rods 94 are located at both ends of the first connecting rod 95 and are respectively connected to the lifting rod 92 and the second connecting rod 98. The second operating block 96 is located on the side of the lifting rod 92 and the second connecting rod 98 near the rotating rod 94. The locking block 97 is located on the side of the second operating block 96 near the rotating rod 94. The ball 99 is located on the side of the second connecting rod 98 away from the rotating rod 94 and is located inside the headrest 910.
[0036] When adjusting the headrest 910 angle, the mounting block 91 can be fixed to the upper end of the second bracket 3. Then, the lifting rod 92 slides inside the mounting block 91 to adjust the height of the headrest 910. Next, rotate the first operating block 93 on one side of the mounting block 91 so that one end of the first operating block 93 abuts and is fixed to the lifting rod 92. Then, the rotating rods 94 at both ends of the first connecting rod 95 rotate on the surfaces of the lifting rod 92 and the second connecting rod 98 to adjust the headrest 910 angle. Finally, rotate the two second operating blocks 96 so that the locking block 9 on one side of the second operating block 96... 7. Approach the rotating rod 94 and engage with it to secure it. Then, fix the headrest 910 after adjusting its angle. Rotate the headrest 910 onto the surface of the sphere 99 and fix it to the sphere 99 through friction. Then, make the final fine adjustment of the headrest 910 to adapt it to users of different heights. By using the adjustment component 9, the angle and height of the headrest 910 can be adjusted so that the head of users of different heights can be supported by the headrest 910, thereby improving the adaptability of the wheelchair and thus improving the use effect of the wheelchair.
[0037] The seat system 2 has two support rods rotatably mounted on its front side. Leg rests 51 are fixedly mounted on the two support rods 5 via connecting blocks. Retractable adjusting rods 6 are respectively mounted on the front ends of the two support rods 5, and footrests 61 are fixedly mounted on the adjusting rods 6. The leg rests 51, through the rotational hinges of the support rods 5 and the telescopic structure of the adjusting rods 6, allow for coordinated adjustment of the lower limb support length and angle, with a tilt angle of 0-60°. Combined with the seat tilt function, this creates a "zero-gravity" posture, effectively reducing ischial pressure and preventing pressure sores.
[0038] The seat system 2 has side supports 7 that are foldably mounted on both sides of the seat cushion via hinges, and shoulder supports 71 that are foldably mounted on both sides of the backrest via hinges. Armrests 8 are rotatably mounted on both sides of the backrest via rotating hinges. The side supports 7 and shoulder supports 71 use folding hinges, providing lateral support through a physical limiting structure to prevent the user from tilting to the side. The armrests 8 use 90° rotating hinges, enabling height adaptation and horizontal unfolding / storage functions. Together with the side supports 7, they form a multimodal support interface, meeting the user's arm support needs in scenarios such as moving around and dining, reducing shoulder joint strain. The seat system 2 floor mat has a U-shaped groove 22, under which a commode 23 is fixedly installed. The integrated design of the U-shaped groove 22 and the commode 23 allows for quick disassembly and switching to toilet function, solving the hygiene problem of traditional wheelchairs requiring an additional commode. The soft sealing ring at the edge of the groove prevents liquid leakage, improving the convenience of long-term bedridden users.
[0039] Working principle: When adjusting the tilt angle of the seat system, the user pulls the control handle (3) with one hand, and releases the lock between the sliding block mechanism (172) and the limit tooth (21) through the brake line (4). Push the backrest so that the slide rail (20) slides along the pulley (171) to the target tilt angle (e.g., 30°). After releasing the control handle (3), the sliding block mechanism (172) automatically engages with the corresponding tooth of the limit tooth (21) to complete the fixation of the seat angle.
[0040] When adjusting the headrest 910 angle, the mounting block 91 can be fixed to the upper end of the second bracket 3. Then, the lifting rod 92 slides inside the mounting block 91 to adjust the height of the headrest 910. Next, rotate the first operating block 93 on one side of the mounting block 91 so that one end of the first operating block 93 abuts and is fixed to the lifting rod 92. Then, the rotating rods 94 at both ends of the first connecting rod 95 rotate on the surfaces of the lifting rod 92 and the second connecting rod 98 to adjust the headrest 910 angle. Finally, rotate the two second operating blocks 96 so that the locking block 9 on one side of the second operating block 96... 7. Approach the rotating rod 94 and engage with it to secure it. Then, fix the headrest 910 after adjusting its angle. Rotate the headrest 910 onto the surface of the sphere 99 and fix it to the sphere 99 through friction. Then, make the final fine adjustment of the headrest 910 to adapt it to users of different heights. By using the adjustment component 9, the angle and height of the headrest 910 can be adjusted so that the head of users of different heights can be supported by the headrest 910, thereby improving the adaptability of the wheelchair and thus improving the use effect of the wheelchair.
[0041] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.
Claims
1. An adjustable wheelchair, comprising a main frame (1) and a seating system (2), wherein casters (11) are respectively installed at the four corners of the bottom of the main frame (1), and bushings (12) are respectively provided on both sides of the main frame (1), wherein axles (13) are fitted inside the bushings (12), and tires (130) and push rings (131) are installed on the axles (13), and brakes (15) are also installed on the main frame (1), characterized in that: The main frame (1) is fixedly installed with sliding mounting seats (17) on both sides respectively. The seat system (2) is provided with a slide rail (20) at the bottom, and the slide rail (20) is installed on the sliding mounting seat (17). The sliding mounting base (17) has a groove (170) on its top. Two pulleys (171) are rotatably installed in the groove (170). The slide rail (20) is installed in the groove (170) and slidably installed on the outer surface of the pulleys (171). A limiting tooth (21) is also fixedly installed on the inner side of the slide rail (20). A sliding block mechanism (172) is fixedly installed on the inner side of the sliding mounting base (17). The limiting tooth (21) and the sliding block mechanism (172) are coupled together. A control handle (3) is fixedly installed on the back of the seat system (2). A brake line (4) is connected to the control handle (3). The other end of the brake line (4) is connected to the sliding block mechanism (172). By controlling the different tooth positions of the sliding block mechanism (172) and the limiting tooth (21) through the control handle (3), different tilt angles of the seat system can be controlled.
2. An adjustable wheelchair according to claim 1, wherein: The seat system (2) has an adjustment assembly (9) installed on the top of the backrest. The adjustment assembly (9) includes a mounting block (91), a lifting rod (92), a first operating block (93), two rotating rods (94), a first connecting rod (95), a second operating block (96), a locking block (97), a second connecting rod (98), and a ball (99). The mounting block (91) is detachably connected to the top crossbar of the backrest. The lifting rod (92) moves inside the mounting block (91). The first operating block (93) is located on one side of the mounting block (91) to adjust the position of the mounting block (96). 1) The internal lifting rod (92) is fixed, and the two rotating rods (94) are set at both ends of the first connecting rod (95) and are respectively connected to the lifting rod (92) and the second connecting rod (98). The lifting rod (92) and the second connecting rod (98) are provided with a second operating block (96) on the side near the rotating rod (94). The locking block (97) is located on the side of the second operating block (96) near the rotating rod (94). The ball (99) is located on the side of the second connecting rod (98) away from the rotating rod (94), and the ball (99) is located inside the headrest (910).
3. An adjustable wheelchair according to claim 2, wherein: The seat system (2) has two support rods (5) rotatably mounted on the front side. Leg rests (51) are fixedly mounted on the two support rods (5) through connecting blocks. Telescopic adjustment rods (6) are respectively mounted on the front ends of the two support rods (5). Foot pedals (61) are respectively fixedly mounted on the adjustment rods (6).
4. An adjustable wheelchair according to claim 2 or 3, wherein: The seat system (2) has side supports (7) that are foldable on both sides of the seat cushion via hinges, and shoulder supports (71) that are foldable on both sides of the backrest via hinges.
5. An adjustable wheelchair according to claim 4, wherein: The seat system (2) has armrests (8) that are rotatably mounted on both sides of the backrest via rotating hinges.
6. An adjustable wheelchair according to claim 2, wherein: One end of the sliding mounting base (17) is provided with a limiting component (14). The limiting component (14) includes a limiting rod (141) and a control block (142). The limiting rod (141) slides inside the sliding mounting base (17) to limit the maximum displacement of the seat system (2). The control block (142) drives the limiting rod (141) to move inside the sliding mounting base (17).
7. An adjustable wheelchair according to claim 6, wherein: The seating system (2) has a U-shaped groove (22) on the floor mat, and a toilet (23) is fixedly installed below the U-shaped groove (22).