Multi-section telescopic wheel type stair climbing wheelchair
Through the design of a multi-stage telescopic wheelchair, the center of gravity and hook mechanism is adjusted by using electric telescopic rods and driving components, the problem of existing wheelchairs requiring manual assistance when climbing stairs is solved, achieving the effect of smooth climbing stairs and improving independence and safety.
Patent Information
- Application Number
- CN202422201522.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-09
- Publication Date
- 2025-08-19
- Estimated Expiration
- 2034-09-09
AI Technical Summary
The existing stair climbing wheelchair requires the assistance of the operator during the climbing process to avoid unstable center of gravity, which increases the difficulty of use.
A multi-stage telescopic wheelchair is designed to adjust the center of gravity of the wheelchair through an electric telescopic rod, and a smooth climb is achieved using a drive assembly and a hook mechanism, including an electric telescopic rod, a fixing frame, a first roller and a drive assembly, ensuring that the wheelchair does not require manual assistance when climbing the stairs.
The center of gravity of the wheelchair is effectively adjusted to ensure smooth progress during the stairs climbing, improve operational independence and safety, and avoid problems caused by unstable center of gravity.
Smart Images
Figure CN223232911U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of wheelchairs, and in particular relates to a multi-section telescopic wheelchair for stair climbing. Background Art
[0002] With the development of society and the increasing aging of the population, the elderly are increasingly in need of modern high-tech to improve their quality of life and freedom of life. A stair climbing wheelchair is a special wheelchair that can assist elderly people with limited mobility to go up and down stairs. Ordinary wheelchairs can only move on flat ground. For some elderly people who need to go upstairs but have difficulty moving their legs and feet, they need a stair climbing wheelchair.
[0003] There are two main types of stair-climbing wheelchairs commonly found on the market: tracked stair-climbing wheelchairs and planetary gear rolling stair-climbing wheelchairs. Although these designs can theoretically achieve the function of climbing stairs, they have a significant problem in actual application: during the climbing process, the wheelchair requires the assistance of the operator to avoid the problem of unstable center of gravity during the climbing process. This operation method that relies on manual assistance increases the difficulty of use. Utility Model Content
[0004] The purpose of the utility model is to provide a multi-stage telescopic wheelchair for stair climbing, so as to solve the problem in the prior art that the wheelchair needs the assistance of an operator during the climbing process to avoid the problem of unstable center of gravity during the climbing process.
[0005] To achieve the above objectives, the present invention provides the following technical solutions:
[0006] A multi-section telescopic wheeled stair-climbing wheelchair comprises an electric wheelchair frame, wherein front wheel mechanisms are provided on both the front and rear sides of the left end of the electric wheelchair frame, and the front wheel mechanisms are used to change the center of gravity of the electric wheelchair frame; and rear wheel mechanisms are provided on both the front and rear sides of the right end of the electric wheelchair frame, and the rear wheel mechanisms are used to support the wheelchair in stair climbing operations.
[0007] Preferably: the front wheel mechanism includes an electric telescopic rod and a fixing frame, the front and rear sides of the left end of the electric wheelchair frame are fixedly connected to the electric telescopic rod, the output shaft end of the electric telescopic rod is rotatably connected to the fixing frame through a bearing, and the second roller is rotatably connected inside the fixing frame.
[0008] Preferably, the fixing frame is arranged in a triangle shape, and the second rollers are provided in three groups and are evenly distributed inside the fixing frame.
[0009] Preferably: the rear wheel mechanism includes a first roller and a drive assembly, the front and rear sides of the right end of the electric wheelchair frame are rotatably connected to the first roller, a reserved groove is opened on the side wall of the first roller, a connecting rod is rotatably connected to the inside of the reserved groove through a rotating shaft, the side wall of the connecting rod is fixedly connected to the grab hook, and the grab hook is located inside the reserved groove.
[0010] Preferably: a driving assembly is provided inside the first roller, and the driving assembly is used to cause the grab hook to extend outward from the reserved groove. The driving assembly includes a connecting disk and a motor. The first roller is rotatably connected to the connecting disk inside, and the end of the connecting disk away from the electric wheelchair frame is fixedly connected to a worm gear. The inner wall of the first roller is fixedly connected to the motor, and the output shaft end of the motor is fixedly connected to a worm, and the worm gear and the worm gear are engaged with each other.
[0011] Preferably, the end of the connecting plate away from the electric wheelchair frame is rotatably connected to a buffer telescopic member via a bearing, and the end of the buffer telescopic member away from the connecting plate is rotatably connected to the end of the connecting rod away from the rotating shaft.
[0012] Preferably: the buffer telescopic part includes a sleeve and a moving rod, the end of the connecting plate away from the electric wheelchair frame is rotatably connected to the sleeve through a bearing, the moving rod is slidably connected inside the sleeve, the end of the moving rod close to the bearing is fixedly connected to a spring, the end of the spring away from the moving rod is fixedly connected to the inner wall of the sleeve, and the end of the moving rod away from the spring is rotatably connected to the end of the connecting rod away from the rotating shaft.
[0013] Compared with the prior art, the beneficial effects of the present invention are:
[0014] 1. During stair climbing, the utility model activates the electric telescopic rod, causing the left end of the wheelchair to lift upward. This design effectively adjusts the wheelchair's center of gravity, ensuring that the electric wheelchair frame remains parallel to the horizontal plane during stair climbing. Therefore, the wheelchair does not require operator assistance during stair climbing, effectively avoiding problems caused by an unstable center of gravity and improving operational independence and safety.
[0015] 2. The utility model drives the movement of the connecting rod through the driving assembly, and then uses the lever principle to cause the grab hook to expand outward. The expanded grab hook can be stably attached to the upper right step. As the first roller rotates, the traction force of the grab hook drives the electric wheelchair frame to move to the upper right side, achieving a smooth climbing effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a schematic diagram of the overall main structure of the utility model;
[0017] Figure 2 For this utility model Figure 1 A schematic diagram of the enlarged structure of part A;
[0018] Figure 3 This is a schematic diagram of the cross-sectional planar structure of the rear wheel mechanism of the present invention;
[0019] Figure 4 This is a schematic diagram of the structure of the utility model with the grab hook unfolded outwards;
[0020] Figure 5 This is a schematic diagram of the cross-sectional planar structure of the buffer telescopic member of the present invention.
[0021] In the figure: 1. Electric wheelchair frame; 2. Rear wheel mechanism; 21. First roller; 211. Reserved slot; 22. Connecting rod; 23. Grab hook; 24. Drive assembly; 241. Connecting plate; 242. Worm gear; 243. Motor; 244. Worm; 245. Buffer telescopic member; 2451. Sleeve; 2452. Moving rod; 2453. Spring; 3. Front wheel mechanism; 31. Electric telescopic rod; 32. Fixed frame; 33. Second roller. DETAILED DESCRIPTION
[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0023] Reference Figure 1-Figure 5 As shown, the utility model provides a multi-section retractable wheel stair-climbing wheelchair, including an electric wheelchair frame 1, front wheel mechanisms 3 are provided on the front and rear sides of the left end of the electric wheelchair frame 1, and the front wheel mechanisms 3 are used to change the center of gravity of the electric wheelchair frame 1, and rear wheel mechanisms 2 are provided on the front and rear sides of the right end of the electric wheelchair frame 1, and the rear wheel mechanisms 2 are used to support the wheelchair in climbing stairs; by starting the front wheel mechanisms 3, the center of gravity of the electric wheelchair frame 1 that is climbing the stairs can be changed, so that the electric wheelchair is more stable during the process of climbing the stairs, thereby improving safety; by starting the rear wheel mechanisms 2, the electric wheelchair frame 1 can be driven to move to the upper right side, thereby achieving a smooth climbing effect.
[0024] In a further embodiment, referring to Figure 1-Figure 2 The front wheel mechanism 3 includes an electric telescopic rod 31 and a fixing frame 32. The electric telescopic rod 31 is fixedly connected to the front and rear sides of the left end of the electric wheelchair frame 1. The output shaft end of the electric telescopic rod 31 is rotatably connected to the fixing frame 32 through a bearing, and the second roller 33 is rotatably connected inside the fixing frame 32.
[0025] In this embodiment, the left end of the wheelchair is lifted upward by activating the electric telescopic rod 31. This design effectively adjusts the wheelchair's center of gravity, ensuring that the electric wheelchair frame 1 remains parallel to the horizontal plane during stair climbing. Therefore, the wheelchair does not require operator assistance when climbing stairs, effectively avoiding problems caused by an unstable center of gravity and improving operational independence and safety.
[0026] In a further embodiment, referring to Figure 1-Figure 2 The fixing frame 32 is arranged in a triangle shape, and three groups of second rollers 33 are arranged and are evenly distributed inside the fixing frame 32 .
[0027] In this embodiment, three groups of first rollers 21 are provided on the fixing frame 32. These rollers play a key role when climbing stairs. When the lowest first roller 21 encounters an obstacle on the stairs, the fixing frame 32 rotates through its traction mechanism. This design enables the first roller 21 located above the fixing frame 32 to smoothly contact the stairs on the upper right side. In this way, each group of first rollers 21 can contact the stairs in turn, ensuring that the electric wheelchair frame 1 remains stable during the upward climbing process.
[0028] In a further embodiment, referring to Figure 3-Figure 4 The rear wheel mechanism 2 includes a first roller 21 and a driving assembly 24. The first roller 21 is rotatably connected to the front and rear sides of the right end of the electric wheelchair frame 1. A reserved groove 211 is provided on the side wall of the first roller 21. The inside of the reserved groove 211 is rotatably connected to a connecting rod 22 through a rotating shaft. The side wall of the connecting rod 22 is fixedly connected to a grab hook 23. The grab hook 23 is located inside the reserved groove 211. A driving assembly 24 is provided inside the first roller 21. The driving assembly 24 is used to cause the grab hook 23 to extend outward from the reserved groove 211. The driving assembly 24 includes a connecting plate 241 and The motor 243 and the first roller 21 are rotatably connected to a connecting disk 241 inside, and a worm gear 242 is fixedly connected to the end of the connecting disk 241 away from the electric wheelchair frame 1. The inner wall of the first roller 21 is fixedly connected to the motor 243, and a worm 244 is fixedly connected to the output shaft end of the motor 243. The worm 244 and the worm gear 242 are engaged with each other. The end of the connecting disk 241 away from the electric wheelchair frame 1 is rotatably connected to a buffer telescopic member 245 through a bearing. The end of the buffer telescopic member 245 away from the connecting disk 241 is rotatably connected to the end of the connecting rod 22 away from the rotating shaft.
[0029] In this embodiment, when it is necessary to climb stairs, the worm 244 is driven to rotate by starting the motor 243. Since the worm 244 and the worm wheel 242 are engaged with each other, the worm wheel 242 is driven to rotate. The rotation of the worm wheel 242 drives the connecting plate 241 to rotate. The rotation of the connecting plate 241 drives the buffer telescopic member 245 to move, and then drives the connecting rod 22 to move. The movement of the connecting rod 22 drives the grab hook 23 to extend outward from the inside of the reserved groove 211. The unfolded grab hook 23 can be stably attached to the upper right step. As the first roller 21 rotates, the traction force of the grab hook 23 drives the electric wheelchair frame 1 to move to the upper right side, achieving a smooth climbing effect.
[0030] In a further embodiment, referring to Figure 5 The buffer telescopic member 245 includes a sleeve 2451 and a moving rod 2452. The end of the connecting plate 241 away from the electric wheelchair frame 1 is rotatably connected to the sleeve 2451 through a bearing. The moving rod 2452 is slidably connected inside the sleeve 2451. The end of the moving rod 2452 close to the bearing is fixedly connected to a spring 2453. The end of the spring 2453 away from the moving rod 2452 is fixedly connected to the inner wall of the sleeve 2451. The end of the moving rod 2452 away from the spring 2453 is rotatably connected to the end of the connecting rod 22 away from the rotating shaft.
[0031] In this embodiment, when the grab hook 23 moves to the position directly below the first roller 21, it will be subjected to pressure exerted by the first roller 21. This pressure prompts the grab hook 23 to move into the reserved groove 211, thereby driving the connecting rod 22 to rotate. As the connecting rod 22 rotates, the moving rod 2452 is driven to slide inside the sleeve 2451, squeezing the spring 2453. When the grab hook 23 leaves the ground, the deformation recovery force of the spring 2453 will push the moving rod 2452 to extend outward, driving the grab hook 23 to return to its initial position. This mechanism not only ensures the stable movement of the grab hook 23, but also effectively avoids the bending or damage of the grab hook 23 caused by the pressure of the first roller 21 when the grab hook 23 moves to below the first roller 21.
[0032] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may 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 multi-stage telescopic wheelchair for stair climbing, comprising an electric wheelchair frame (1), characterized in that: The electric wheelchair frame (1) is provided with front wheel mechanisms (3) on both the front and rear sides of the left end, and the front wheel mechanisms (3) are used to change the center of gravity of the electric wheelchair frame (1); the electric wheelchair frame (1) is provided with rear wheel mechanisms (2) on both the front and rear sides of the right end, and the rear wheel mechanisms (2) are used to support the wheelchair in stair climbing operations.
2. The multi-stage telescopic wheelchair according to claim 1, characterized in that: The front wheel mechanism (3) comprises an electric telescopic rod (31) and a fixing frame (32); the electric telescopic rod (31) is fixedly connected to both the front and rear sides of the left end of the electric wheelchair frame (1); the output shaft end of the electric telescopic rod (31) is rotatably connected to the fixing frame (32) via a bearing; and the fixing frame (32) is rotatably connected to a second roller (33) inside.
3. The multi-stage telescopic wheelchair according to claim 2, characterized in that: The fixing frame (32) is arranged in a triangle shape, and the second rollers (33) are arranged in three groups and are evenly distributed inside the fixing frame (32).
4. The multi-stage telescopic wheelchair according to claim 1, characterized in that: The rear wheel mechanism (2) comprises a first roller (21) and a driving assembly (24); the first roller (21) is rotatably connected to both the front and rear sides of the right end of the electric wheelchair frame (1); a reserved groove (211) is provided on the side wall of the first roller (21); a connecting rod (22) is rotatably connected to the inside of the reserved groove (211) via a rotating shaft; a grab hook (23) is fixedly connected to the side wall of the connecting rod (22); and the grab hook (23) is located inside the reserved groove (211).
5. The multi-stage telescopic wheelchair stair climbing wheelchair according to claim 4, characterized in that: A driving assembly (24) is provided inside the first roller (21), and the driving assembly (24) is used to cause the grab hook (23) to extend outward from the reserved groove (211). The driving assembly (24) includes a connecting disk (241) and a motor (243). The first roller (21) is rotatably connected to the connecting disk (241). One end of the connecting disk (241) away from the electric wheelchair frame (1) is fixedly connected to a worm gear (242). The inner wall of the first roller (21) is fixedly connected to the motor (243). The output shaft end of the motor (243) is fixedly connected to a worm (244), and the worm gear (244) and the worm gear (242) are meshed with each other.
6. The multi-stage telescopic wheelchair stair climbing wheelchair according to claim 5, characterized in that: One end of the connecting plate (241) away from the electric wheelchair frame (1) is rotatably connected to a buffer telescopic member (245) via a bearing, and one end of the buffer telescopic member (245) away from the connecting plate (241) is rotatably connected to one end of the connecting rod (22) away from the rotating shaft.
7. The multi-stage telescopic wheelchair stair climbing wheelchair according to claim 6, characterized in that: The buffer telescopic member (245) includes a sleeve (2451) and a moving rod (2452); the end of the connecting plate (241) away from the electric wheelchair frame (1) is rotatably connected to the sleeve (2451) via a bearing; the moving rod (2452) is slidably connected inside the sleeve (2451); the end of the moving rod (2452) close to the bearing is fixedly connected to a spring (2453); the end of the spring (2453) away from the moving rod (2452) is fixedly connected to the inner wall of the sleeve (2451); the end of the moving rod (2452) away from the spring (2453) is rotatably connected to the end of the connecting rod (22) away from the rotating shaft.