Multifunctional rehabilitation manual wheelchair
By designing a gear shift mechanism on a multi-function rehabilitation manual wheelchair, the automatic speed change and power output adjustment of the wheelchair is solved, and the user's hand is contaminated with dirt and insufficient climbing ability is improved, which improves the user's travel experience and rehabilitation effect.
Patent Information
- Application Number
- CN202510231050.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-28
- Publication Date
- 2025-07-04
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
During the use of a traditional multi-functional rehabilitation manual wheelchair, the user's hands are prone to dirt and have poor climbing ability, which affects the user experience and rehabilitation effect.
A multi-functional rehabilitation manual wheelchair is designed, using a speed change mechanism, which drives the gears and chain transmission system through the handwheel to achieve the speed change of the wheelchair, avoiding dirt from the user's hands, and automatically adjusts the power output according to the terrain to enhance the climbing ability.
It effectively avoids dirt contamination on users' hands during the push, significantly improves hygiene and safety, while reducing physical consumption, enhancing hill climbing ability, broadening the range of activities, and improving rehabilitation efficiency and quality of life.
Smart Images
Figure CN120241399A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of rehabilitation equipment, in particular to a multifunctional rehabilitation manual wheelchair. Background Art
[0002] Manual wheelchairs, as an important tool to assist people with limited mobility, have played an irreplaceable role in medical rehabilitation, daily life and barrier-free travel since their birth with their simple and practical features. This type of wheelchair is usually composed of a wheelchair frame, a seat, wheels and a manual drive device. Users manually turn the drive wheel on the wheel to push the wheel forward, realizing the basic mobility function. During the rehabilitation process, manual wheelchairs not only help patients restore their autonomous mobility and enhance their physical functions, but also greatly improve their self-care ability and social participation, and play an important role in promoting mental health and accelerating the rehabilitation process. With the advancement of technology and the diversification of rehabilitation needs, multifunctional rehabilitation manual wheelchairs have emerged. This type of wheelchair incorporates more humanized designs on the basis of tradition, such as adjustable seats to adapt to the physical needs of different users, anti-skid braking systems to ensure driving safety, and foldable structures for easy carrying and storage, etc., aiming to meet the personalized needs of different users and improve the convenience and comfort of use. However, although multifunctional rehabilitation manual wheelchairs have made many advances in design and function, there are still some problems that need to be solved; First, when using a traditional manual wheelchair, the user needs to directly touch and frequently turn the drive wheel to push the wheelchair forward. In outdoor or complex environments, the hands are easily contaminated with dust, stains and other dirt, which not only affects the user experience, but also may pose a potential threat to the user's health. Especially in special periods such as epidemics, it is particularly important to maintain good personal hygiene; Secondly, for users who need to frequently travel on different terrains, especially on sloped roads, the climbing ability of a manual wheelchair becomes a key factor. When facing a steep road surface, traditional multi-functional rehabilitation manual wheelchairs often require users to exert greater physical strength, which not only increases the user's physical burden, but may also limit their range of activities, affecting the rehabilitation effect and quality of life. Summary of the invention
[0003] The object of the present invention is to provide a multifunctional rehabilitation manual wheelchair to at least solve the problems of hygiene and poor climbing ability in the prior art.
[0004] To achieve the above object, the present invention provides the following technical solution: A multifunctional rehabilitation manual wheelchair, comprising: a wheelchair, a first rotating rod, a wheel and a speed change mechanism; the number of the first rotating rods is two, and the two first rotating rods are respectively rotatably arranged at the rear sides of the bottom ends of the left and right sides of the wheelchair through bearings; the wheel is sleeved on the outer side of the outer wall of the first rotating rod and locked; the speed change mechanism is arranged on the top of the wheelchair.
[0005] Preferably, the speed change mechanism includes: a second rotating rod, the number of the second rotating rods is two, and the two second rotating rods are respectively rotatably arranged at the top ends of the left and right sides of the wheelchair through bearings; a first high-speed gear is sleeved on the inner side of the outer wall of the second rotating rod and locked by a setscrew; a first constant-speed gear is sleeved on the inner side of the outer wall of the second rotating rod and locked by a setscrew; a first low-speed gear is sleeved on the inner side of the outer wall of the second rotating rod and locked by a setscrew; a handwheel is sleeved on the outer side of the outer wall of the second rotating rod and locked; a rocker is rotatably arranged at the outer top end of the handwheel through a bearing.
[0006] Preferably, in order to achieve speed change by switching the meshing gears, the speed change mechanism further includes: a rotating rod, the number of the rotating rods is two, the outer ends of the two rotating rods are respectively rotatably arranged at the top ends of the left and right sides of the inner cavity of the wheelchair through bearings, and a plurality of sliding grooves are equidistantly arranged along the circumferential direction on the outer wall of the rotating rod; a sleeve is slidably sleeved on the outer wall of the rotating rod; the number of the sliders is several, the several sliders are respectively arranged equidistantly along the circumferential direction on the inner wall of the sleeve, and the several sliders are respectively slidably inserted into the middle parts of the inner cavities of the several sliding grooves; a second high-speed gear is sleeved on the outer side of the outer wall of the sleeve and locked by a setscrew, and the second high-speed gear is matched with the first high-speed gear; a second constant-speed gear is sleeved on the middle part of the outer wall of the sleeve and locked by a setscrew, and the second constant-speed gear is meshed with the first constant-speed gear; a second low-speed gear is sleeved on the inner side of the outer wall of the sleeve and locked by a setscrew, and the second low-speed gear is matched with the first low-speed gear.
[0007] Preferably, in order to link the wheels, the speed change mechanism further includes: sprockets, the number of the sprockets is four, the four sprockets are respectively sleeved on the inner sides of the outer walls of the two rotating rods and the inner sides of the outer walls of the two first rotating rods and locked by setscrews; the number of the chains is two, and the two ends of the two chains are respectively sleeved on the outer walls of the four sprockets.
[0008] Preferably, in order to promote the linkage of the two paddles, the speed change mechanism further includes: a guide rod, the left and right ends of the guide rod are respectively arranged at the rear ends of the left and right sides of the inner cavity of the wheelchair; the number of paddles is two, the front ends of the two paddles are respectively rotatably sleeved on the left and right sides of the outer walls of the two sleeves through bearings, and the rear sides of the two paddles are respectively slidably sleeved on the left and right sides of the outer wall of the guide rod; the number of racks is two, the two racks are respectively arranged at the front and rear ends of the inner sides of the two paddles, the two racks are respectively located on the front and rear sides of the guide rod, and the two racks are arranged oppositely; the upper and lower ends of the connecting rod are respectively rotatably arranged at the middle parts of the upper and lower sides of the inner cavity of the guide rod through bearings; the linkage gear is sleeved on the middle part of the outer wall of the connecting rod and locked by a set screw, and the linkage gear meshes with both racks.
[0009] Preferably, in order to push the paddle to drive the sleeve to move, the speed change mechanism further includes: a push cylinder, the push cylinder is slidably and adaptively inserted into the top right side of the wheelchair, the left side of the push cylinder extends slidably into the inner cavity of the wheelchair, the left side of the push cylinder is arranged on the right side of the paddle on the right side, three groups of card slots are arranged in the inner wall of the push cylinder along the left-right direction, each group contains several card slots, and several card slots are respectively arranged at equal intervals along the circumferential direction on the inner wall of the push cylinder; a limiting column is arranged on the top right side of the wheelchair, the limiting column is slidably inserted into the inner cavity of the push cylinder, and several extrusion grooves are arranged at equal intervals along the circumferential direction on the left side of the outer wall of the limiting column; a spring is embedded in the inner cavity of the extrusion groove, and one end of the spring is clamped on the inner wall of the extrusion groove; a part of the clamping ball is embedded in the inner cavity of the extrusion groove, and the other part is adaptively inserted into the inner cavity of the card slot corresponding to its position at present, and the other end of the spring is clamped on the outer wall of the clamping ball; a rotating cylinder is rotatably arranged on the top right side of the wheelchair through a bearing, and the push cylinder is screwed into the inner cavity of the rotating cylinder.
[0010] Preferably, the length of the clamping ball extending into the inner cavity of the card slot is less than its radius.
[0011] Preferably, the distance between the second low-speed gear and the first low-speed gear is less than the distance between the first high-speed gear and the second constant-speed gear.
[0012] A multifunctional rehabilitation manual wheelchair proposed by the present invention has the following beneficial effects: 1. By shaking the handwheel, the present invention can promote the rotation of the wheels, and then drive the wheelchair to move by the rotating wheels, thus avoiding the problem of the user's hands being contaminated with dirt; 2. By the rotational force generated by rotating the rotating cylinder, the present invention can promote the push cylinder to push the paddle to drive the sleeve to move. At the same time, the movement of the paddle on the right side can promote the movement of the paddle on the left side by the cooperation between the rack and the linkage gear. The movement of the sleeve can drive the second low-speed gear, the second constant-speed gear and the second high-speed gear to move, so that the speed change of the wheelchair can be realized by changing the meshing gears, and the wheelchair can be applied to different scenarios; 3. This device effectively avoids the problem of the user's hands being contaminated with dirt during the pushing process, significantly improving the hygiene and safety of use. At the same time, the innovative design of the speed-changing mechanism enables the wheelchair to flexibly adjust the power output when facing different terrains, especially slope roads, greatly reducing the physical consumption of the user, enhancing the climbing ability, thus broadening the user's activity range, improving the rehabilitation efficiency and quality of life, and bringing a more convenient, comfortable and safe travel experience to the user. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a schematic structural diagram of the speed-changing mechanism; Figure 3 is an exploded view of the wheelchair; Figure 4 is an exploded view of the speed-changing mechanism; Figure 5 is a schematic structural diagram of the push cylinder; Figure 6 is a schematic structural diagram of the rotating rod; Figure 7 is Figure 2 an enlarged view of part A of Figure 8 is Figure 4 an enlarged view of part B of Figure 9 is Figure 4 an enlarged view of part C of Figure 10 is Figure 4 an enlarged view of part D of Figure 11 is Figure 4 an enlarged view of part E of Figure 12 is Figure 6 an enlarged view of part F of
[0014] In the figure: 1, wheelchair; 2, first rotating rod; 3, wheel; 4, speed-changing mechanism; 41, second rotating rod; 42, first high-speed gear; 43, first constant-speed gear; 44, first low-speed gear; 45, handwheel; 46, rocker; 47, rotating rod; 48, chute; 49, sleeve; 410, slider; 411, second high-speed gear; 412, second constant-speed gear; 413, second low-speed gear; 414, sprocket; 415, chain; 416, guide rod; 417, paddle; 418, rack; 419, connecting rod; 420, linkage gear; 421, push cylinder; 422, card slot; 423, limit post; 424, extrusion groove; 425, spring; 426, ball; 427, rotating cylinder. DETAILED DESCRIPTION OF THE INVENTION
[0015] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.
[0016] Please refer to Figures 1-12 , the present invention provides a technical solution for a multifunctional rehabilitation manual wheelchair, including: a wheelchair 1, a first rotating rod 2, a wheel 3 and a speed change mechanism 4. The number of the first rotating rods 2 is two, and the two first rotating rods 2 are respectively rotatably arranged at the rear sides of the left and right bottoms of the wheelchair 1 through bearings. The first rotating rod 2 is used to drive the wheel 3 to rotate. The wheel 3 is sleeved on the outer side of the outer wall of the first rotating rod 2 and locked. The wheel 3 is used to drive the wheelchair 1 to move. The speed change mechanism 4 is arranged at the top of the wheelchair 1, and the speed change mechanism 4 is used to realize the speed change of the wheel 3 so as to adapt to different terrains.
[0017] As a preferred solution, further, the speed change mechanism 4 includes: a second rotating rod 41, a first high-speed gear 42, a first constant-speed gear 43, a first low-speed gear 44, a handwheel 45, a rocker 46, a rotating rod 47, a chute 48, a sleeve 49, a slider 410, a second high-speed gear 411, a second constant-speed gear 412, a second low-speed gear 413, a sprocket 414, a chain 415, a guide rod 416, a paddle 417, a rack 418, a connecting rod 419, a linkage gear 420, a push cylinder 421, a card slot 422, a limit post 423, a squeezing groove 424, a spring 425, a ball 426 and a rotating cylinder 427. The number of the second rotating rods 41 is two, and the two second rotating rods 41 are respectively rotatably arranged at the tops of the left and right sides of the wheelchair 1 through bearings. The first high-speed gear 42 is sleeved on the inner side of the outer wall of the second rotating rod 41 and locked by a setscrew. The first constant-speed gear 43 is sleeved on the inner side of the outer wall of the second rotating rod 41 and locked by a setscrew. The first low-speed gear 44 is sleeved on the inner side of the outer wall of the second rotating rod 41 and locked by a setscrew. The handwheel 45 is sleeved on the outer side of the outer wall of the second rotating rod 41 and locked. By rotating the handwheel 45, the first high-speed gear 42, the first constant-speed gear 43 and the first low-speed gear 44 can be driven to rotate. The rocker 46 is rotatably arranged at the outer top end of the handwheel 45 through a bearing. The number of the rotating rods 47 is two, and the outer ends of the two rotating rods 47 are respectively rotatably arranged at the tops of the left and right sides of the inner cavity of the wheelchair 1 through bearings. A plurality of chutes 48 are circumferentially and equidistantly formed on the outer wall of the rotating rod 47. The sleeve 49 is slidably sleeved on the outer wall of the rotating rod 47. The number of the sliders 410 is several, and the several sliders 410 are respectively circumferentially and equidistantly arranged on the inner wall of the sleeve 49. The several sliders 410 are respectively slidably and adaptively inserted into the middle parts of the inner cavities of the several chutes 48. When the sleeve 49 rotates, the cooperation between the sliders 410 and the chutes 48 can be used to drive the rotating rod 47 to rotate. The second high-speed gear 411 is sleeved on the outer side of the outer wall of the sleeve 49 and locked by a setscrew. The second high-speed gear 411 is matched with the first high-speed gear 42. The second constant-speed gear 412 is sleeved on the middle part of the outer wall of the sleeve 49 and locked by a setscrew. The second constant-speed gear 412 is meshed with the first constant-speed gear 43. The second low-speed gear 413 is sleeved on the inner side of the outer wall of the sleeve 49 and locked by a setscrew. The second low-speed gear 413 is matched with the first low-speed gear 44. The distance between the second low-speed gear 413 and the first low-speed gear 44 is less than the distance between the first high-speed gear 42 and the second constant-speed gear 412, ensuring that the second low-speed gear 413 and the first low-speed gear 44 can be meshed. The number of the sprockets 414 is four, and the four sprockets 414 are respectively sleeved on the inner sides of the outer walls of the two rotating rods 47 and the inner sides of the outer walls of the two first rotating rods 2 and locked by setscrews. The number of the chains 415 is two, and the two ends of the two chains 415 are respectively sleeved on the outer walls of the four sprockets 414. When the rotating rod 47 rotates,The cooperation between the chain 415 and the sprocket 414 can drive the first rotating rod 2 to rotate. The left and right ends of the guide rod 416 are respectively arranged at the rear ends of the left and right sides of the inner cavity of the wheelchair 1. The guide rod 416 is used to support the paddle 417 and the linkage gear 420. The number of paddles 417 is two. The front ends of the two paddles 417 are respectively rotatably sleeved on the left and right sides of the outer walls of the two sleeves 49 through bearings. The rear sides of the two paddles 417 are respectively slidably sleeved on the left and right sides of the outer wall of the guide rod 416. The paddle 417 is used to drive the sleeve 49 to move. The number of racks 418 is two. The two racks 418 are respectively arranged at the front and rear ends of the inner sides of the two paddles 417. The two racks 418 are respectively located on the front and rear sides of the guide rod 416, and the two racks 418 are arranged oppositely. The cooperation between the rack 418 and the linkage gear 420 can promote the synchronous movement of the two paddles 417. The upper and lower ends of the connecting rod 419 are respectively rotatably arranged at the middle parts of the upper and lower sides of the inner cavity of the guide rod 416 through bearings. The linkage gear 420 is sleeved on the middle part of the outer wall of the connecting rod 419 and is locked by a set screw. The linkage gear 420 meshes with both of the two racks 418. The push cylinder 421 is slidably and adaptively inserted into the top right side of the wheelchair 1. The left side of the push cylinder 421 slidably extends into the inner cavity of the wheelchair 1. The left side of the push cylinder 421 is arranged on the right side of the paddle 417 located on the right side. Three groups of card slots 422 are opened in the inner wall of the push cylinder 421 along the left-right direction. Each group contains several card slots 422. The several card slots 422 are respectively opened on the inner wall of the push cylinder 421 at equal circumferential intervals. The push cylinder 421 is used to push the paddle 417 to move. The limit post 423 is arranged at the top right side of the wheelchair 1. The limit post 423 is slidably inserted into the inner cavity of the push cylinder 421. A number of extrusion grooves 424 are opened on the left side of the outer wall of the limit post 423 at equal circumferential intervals. The spring 425 is embedded in the inner cavity of the extrusion groove 424. One end of the spring 425 is clamped on the inner wall of the extrusion groove 424. The spring 425 is a torsion spring. It undergoes elastic deformation after being extruded or stretched by an external force and returns to its initial state after the external force is removed. The spring 425 is used here to squeeze the ball 426 into the inner cavity of the card slot 422. A part of the ball 426 is embedded in the inner cavity of the extrusion groove 424, and the other part is adaptively inserted into the inner cavity of the currently corresponding card slot 422. The other end of the spring 425 is clamped on the outer wall of the ball 426. The cooperation between the ball 426 and the card slot 422 can ensure the stability of the position of the push cylinder 421. The rotating cylinder 427 is rotatably arranged at the top right side of the wheelchair 1 through a bearing. The push cylinder 421 is screwed into the inner cavity of the rotating cylinder 427. The rotational force generated by the rotation of the rotating cylinder 427 can promote the movement of the push cylinder 421.,
[0018] The detailed connection means are well-known techniques in the art. The following mainly introduces the working principle and process. The specific work is as follows.
[0019] When in use, when adjusting the meshing gears according to the current terrain, when on a flat road surface, the current first constant-speed gear 43 and the second constant-speed gear 412 are meshed to ensure that the rotation ratio of the handwheel 45 and the wheel 3 is synchronized. By rotating the handwheel 45, the second rotating rod 41 is driven to rotate. The rotation of the second rotating rod 41 can drive the first constant-speed gear 43 to rotate. The rotation of the first constant-speed gear 43 can drive the sleeve 49 to rotate through the second constant-speed gear 412. The rotation of the sleeve 49 can use the cooperation between the chute 48 and the slider 410 to drive the sprocket 414 on the outer wall to rotate through the rotating rod 47. Thus, the cooperation between the sprocket 414 and the chain 415 can cause the first rotating rod 2 to drive the wheel 3 to rotate, so as to move. When going uphill, the drum 427 can be rotated. The rotational force generated by the rotation of the drum 427 can cause the push cylinder 421 to push the flap 417 on the right side to move inward. Thus, the cooperation between the rack 418 on the right side and the linkage gear 420 can cause the rack 418 on the left side to pull the flap 417 on the left side to move inward. At the same time, during the inward movement of the push cylinder 421, the clamping ball 426 can be squeezed by the clamping groove 422, causing the clamping ball 426 to move into the inner cavity of the extrusion groove 424 and squeezing the spring 425 to deform elastically. The inward movement of the flap 417 can drive the sleeve 49 to move inward along the outer wall of the rotating rod 47 until the sleeve 49 moves to the position where the first low-speed gear 44 and the second low-speed gear 413 are meshed, and the first constant-speed gear 43 and the second constant-speed gear 412 are disengaged. At this time, the clamping ball 426 moves to the next set of clamping grooves 422. Under the elastic force of the spring 425, the clamping ball 426 can be pushed into the inner cavity of the current clamping groove 422 corresponding to its position. When the user hears a "click" sound, it can indicate that the first low-speed gear 44 and the second low-speed gear 413 are meshed at this time. Since the diameter of the first low-speed gear 44 is smaller than that of the second low-speed gear 413, the torque can be increased, making it easier for the user to climb slopes. The user can drive the first low-speed gear 44 to rotate by rotating the handwheel 45. The cooperation between the first low-speed gear 44 and the second low-speed gear 413 can drive the rotating rod 47 to rotate. The rotation of the rotating rod 47 can use the cooperation between the sprocket 414 and the chain 415 to drive the wheel 3 to rotate through the first rotating rod 2, so as to move. When it is necessary to increase the forward speed of the wheelchair 1, the drum 427 can be rotated in the opposite direction, which can cause the push cylinder 421 to pull the flap 417 to move outward until the first high-speed gear 42 and the second high-speed gear 411 are meshed. At this time, the torque increases and the vehicle speed increases. Furthermore, when rotating the handwheel 45, it will be more laborious, but the moving speed will increase. This device effectively avoids the problem that the user's hands are contaminated with dirt during the pushing process, and significantly improves the hygiene and safety of use.Meanwhile, the innovative design of the speed-changing mechanism enables the wheelchair to flexibly adjust the power output when facing different terrains, especially slope roads, greatly reducing the physical consumption of users, enhancing the climbing ability, thus broadening the activity range of users, improving the rehabilitation efficiency and quality of life, and bringing a more convenient, comfortable and safe travel experience to users.
[0020] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A multifunctional rehabilitation manual wheelchair, characterized in that, Comprising: A wheelchair (1); A first rotating rod (2), the number of the first rotating rods (2) being two, and the two first rotating rods (2) being rotatably arranged on the rear sides of the bottom ends of the left and right sides of the wheelchair (1) respectively through bearings; Wheels (3), the wheels (3) being sleeved on the outer sides of the outer walls of the first rotating rods (2) and locked; A speed change mechanism (4), the speed change mechanism (4) being arranged on the top of the wheelchair (1); The speed change mechanism (4) includes: Second rotating rods (41), the number of the second rotating rods (41) being two, and the two second rotating rods (41) being rotatably arranged on the top ends of the left and right sides of the wheelchair (1) respectively through bearings; A first high-speed gear (42), the first high-speed gear (42) being sleeved on the inner side of the outer wall of the second rotating rod (41) and locked by a set screw; A first constant-speed gear (43), the first constant-speed gear (43) being sleeved on the inner side of the outer wall of the second rotating rod (41) and locked by a set screw; A first low-speed gear (44), the first low-speed gear (44) being sleeved on the inner side of the outer wall of the second rotating rod (41) and locked by a set screw; A handwheel (45), the handwheel (45) being sleeved on the outer side of the outer wall of the second rotating rod (41) and locked; A rocker (46), the rocker (46) being rotatably arranged at the outer top end of the handwheel (45) through a bearing.
2. The multifunctional rehabilitation manual wheelchair according to claim 1, characterized in that: The speed change mechanism (4) further includes: Rotating rods (47), the number of the rotating rods (47) being two, the outer ends of the two rotating rods (47) being rotatably arranged on the top ends of the left and right sides of the inner cavity of the wheelchair (1) respectively through bearings, and a plurality of sliding grooves (48) being circumferentially and equidistantly formed on the outer walls of the rotating rods (47); Sleeves (49), the sleeves (49) being slidably sleeved on the outer walls of the rotating rods (47); Sliders (410), the number of the sliders (410) being several, the several sliders (410) being circumferentially and equidistantly arranged on the inner walls of the sleeves (49) respectively, and the several sliders (410) being slidably and adaptively inserted into the middle parts of the inner cavities of the several sliding grooves (48); A second high-speed gear (411), the second high-speed gear (411) being sleeved on the outer side of the outer wall of the sleeve (49) and locked by a set screw, and the second high-speed gear (411) being matched with the first high-speed gear (42); A second constant-speed gear (412), the second constant-speed gear (412) being sleeved on the middle part of the outer wall of the sleeve (49) and locked by a set screw, and the second constant-speed gear (412) being meshed with the first constant-speed gear (43); A second low-speed gear (413), the second low-speed gear (413) being sleeved on the inner side of the outer wall of the sleeve (49) and locked by a set screw, and the second low-speed gear (413) being matched with the first low-speed gear (44).
3. The multifunctional rehabilitation manual wheelchair according to claim 2, wherein: The speed change mechanism (4) further includes: Sprockets (414), the number of the sprockets (414) being four, the four sprockets (414) being sleeved on the inner sides of the outer walls of the two rotating rods (47) and the inner sides of the outer walls of the two first rotating rods (2) respectively and locked by set screws; A chain (415), the number of the chains (415) is two, and both ends of the two chains (415) are respectively sleeved on the outer walls of four sprockets (414).
4. A multifunctional rehabilitation manual wheelchair according to claim 3, characterized in that: The speed change mechanism (4) further includes: A guide rod (416), the left and right ends of the guide rod (416) are respectively arranged at the rear ends of the left and right sides of the inner cavity of the wheelchair (1); Two paddles (417), the front ends of the two paddles (417) are respectively rotatably sleeved on the left and right sides of the outer walls of two sleeves (49) through bearings, and the rear sides of the two paddles (417) are respectively slidably sleeved on the left and right sides of the outer wall of the guide rod (416); Two racks (418), the two racks (418) are respectively arranged at the front and rear ends of the inner sides of the two paddles (417), the two racks (418) are respectively located on the front and rear sides of the guide rod (416), and the two racks (418) are arranged oppositely; A connecting rod (419), the upper and lower ends of the connecting rod (419) are respectively rotatably arranged at the middle parts of the upper and lower sides of the inner cavity of the guide rod (416) through bearings; A linkage gear (420), the linkage gear (420) is sleeved on the middle part of the outer wall of the connecting rod (419) and locked by a set screw, and the linkage gear (420) meshes with both of the two racks (418).
5. A multifunctional rehabilitation manual wheelchair according to claim 4, characterized in that: The speed change mechanism (4) further includes: A push cylinder (421), the push cylinder (421) is slidably and adaptively inserted into the top of the right side of the wheelchair (1), the left side of the push cylinder (421) slidably extends into the inner cavity of the wheelchair (1), the left side of the push cylinder (421) is arranged on the right side of the paddle (417) on the right side, and three groups of clamping grooves (422) are formed in the inner wall of the push cylinder (421) along the left-right direction, each group contains a plurality of the clamping grooves (422), and the plurality of clamping grooves (422) are respectively formed in the inner wall of the push cylinder (421) at equal circumferential intervals; A limiting post (423), the limiting post (423) is arranged at the top of the right side of the wheelchair (1), the limiting post (423) is slidably inserted into the inner cavity of the push cylinder (421), and a plurality of extrusion grooves (424) are formed in the left side of the outer wall of the limiting post (423) at equal circumferential intervals; A spring (425), the spring (425) is embedded in the inner cavity of the extrusion groove (424), and one end of the spring (425) is clamped on the inner wall of the extrusion groove (424); A clamping ball (426), a part of the clamping ball (426) is embedded in the inner cavity of the extrusion groove (424), and the other part is adaptively inserted into the inner cavity of the clamping groove (422) corresponding to its position currently, and the other end of the spring (425) is clamped on the outer wall of the clamping ball (426); A rotating cylinder (427), the rotating cylinder (427) is rotatably arranged at the top of the right side of the wheelchair (1) through a bearing, and the push cylinder (421) is screwed into the inner cavity of the rotating cylinder (427).
6. The multifunctional rehabilitation manual wheelchair according to claim 5, characterized in that: The length of the clamping ball (426) extending into the inner cavity of the clamping groove (422) is less than its radius.
7. The multifunctional rehabilitation manual wheelchair according to claim 6, wherein: The distance between the second low-speed gear (413) and the first low-speed gear (44) is less than the distance between the first high-speed gear (42) and the second constant-speed gear (412).