Electric wheelchair
By adding multiple vertical shock absorbers at key stress points in the electric wheelchair and optimizing the distribution of the shock absorbers, the problems of insufficient shock absorption and poor riding experience have been solved, improving the shock absorption effect and user comfort of the vehicle.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2026-03-31
AI Technical Summary
Existing electric wheelchairs suffer from insufficient shock absorption, resulting in a poor riding experience and making the vehicle structure prone to damage.
Multiple vertical shock absorbers, including backrest shock absorbers, seat cushion shock absorbers, and front wheel shock absorbers, are installed between the upper and lower support components of the wheelchair. The distribution of the shock absorbers is optimized to increase density, especially by placing shock absorbers at critical stress points.
It effectively improves the shock absorption of the wheelchair, enhances the riding experience, and reduces the risk of damage to the vehicle structure.
Smart Images
Figure CN224056200U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medical and rehabilitation equipment technology, and more specifically, to an electric wheelchair. Background Technology
[0002] With the continuous increase in the aging population in China and the growing demand for diversified mobility among people with disabilities, electric wheelchairs have gradually become an indispensable means of transportation in the market. Electric wheelchairs are mechanical devices that are based on traditional hand-cranked wheelchairs but equipped with an electric drive system. Most electric wheelchairs consist of a wheelchair frame, drive motor, controller, and battery. Unlike traditional wheelchairs, electric wheelchairs have a specialized interactive structure, allowing for manual or other forms of instruction to control wheelchair movement, enabling independent mobility without external assistance.
[0003] A wheelchair frame typically consists of several parts, including side frames, a base frame, a seat frame, and wheel supports. The specific frame distribution varies depending on the wheelchair's weight-bearing requirements, folding and storage needs, and other technical specifications. However, both standard and electric wheelchairs also present some usability issues, specifically:
[0004] To ensure the sturdiness and rigidity of wheelchairs, they are typically quite firm when in use, especially when traversing uneven surfaces, resulting in noticeable bumps. While improvements to the seat cushion and backrest materials and dimensions, as well as upgrades to the frame and shock absorption design, have somewhat enhanced the riding experience, they haven't completely resolved the issue of stiffness and poor comfort. Furthermore, comfort is relative; a firm wheelchair also offers insufficient protection for the vehicle itself, making it more susceptible to damage to wheels, frame, and drive components from vibrations and impacts when traversing uneven surfaces.
[0005] In summary, existing electric wheelchair designs suffer from technical problems such as insufficient shock absorption, poor riding experience, and susceptibility to structural damage. Utility Model Content
[0006] The technical problem to be solved by this utility model is that existing electric wheelchair designs have insufficient shock absorption, resulting in a poor riding experience and easy damage to the vehicle structure.
[0007] To address the aforementioned problems, this utility model provides an electric wheelchair, comprising an upper support assembly and a lower support assembly connected to each other. The upper support assembly includes a backrest and a seat cushion for load-bearing, while the lower support assembly supports and connects the wheel assembly. Two vertical backrest shock absorbers are symmetrically connected to the lower support assembly on one side of the backrest of the upper support assembly. Two vertical seat cushion shock absorbers are symmetrically connected to the lower support assembly on the side of the seat cushion opposite to the backrest. A pair of front wheel frames are symmetrically connected to one side of the seat cushion shock absorbers on the lower support assembly, and front wheel shock absorbers are provided at the connection points between the front wheel frames and the lower support assembly.
[0008] The technical solution provided by this utility model optimizes the shock absorption distribution at the connection points based on the traditional wheelchair structural design. Specifically, two backrest shock absorbers are installed on the backrest side of the upper and lower support components, and two seat cushion shock absorbers are installed on the opposite side, i.e., the wheelchair footrest side. As a supplement, a front wheel shock absorber is installed between the connection point of the front wheel frame and the lower support component. All three types of shock absorbers are vertically arranged. Vertical can be understood as the direction perpendicular to the ground when the wheelchair is in normal use. Compared with the prior art, the number of shock absorbers is increased, and each shock absorber is set at the main stress position of the wheelchair frame, making the distribution of shock absorbers on the wheelchair frame more dense. This effectively improves the shock absorption effect of the wheelchair and solves the technical problems of insufficient shock absorption, poor riding experience, and easy damage to the vehicle structure in the existing electric wheelchair design.
[0009] As a preferred embodiment, the upper support assembly includes a backrest frame for supporting the chair back, with a lower backrest crossbeam fixedly connected to the bottom of the backrest frame. The lower support assembly includes a pair of rear wheel support beams, with an upper rear wheel crossbeam pinned between the two rear wheel support beams. The chair back shock absorber is disposed between the lower backrest crossbeam and the upper rear wheel crossbeam. This design optimizes the support structure; the lower backrest crossbeam and the rear wheel support beams are important support components of the wheelchair support. Placing a chair back shock absorber between them effectively optimizes the shock absorption effect near the chair back.
[0010] As a preferred embodiment, the lower support assembly includes front footrest brackets hinged to the two rear wheel support beams on both sides, with a hinge shaft at the hinge position. The upper support assembly includes a seat cushion bracket hinged to the seat back support on one side, and the two ends of the seat cushion shock absorber abut against the outer peripheral walls of the seat cushion bracket and the hinge shaft, respectively. This design optimizes the connection position of the seat cushion shock absorber. The hinge of the front footrest bracket to the rear wheel support beam increases the mobility of the frame, and the connection of the seat cushion shock absorber to the hinge shaft at the hinge position optimizes the balance of the front and rear shock absorption of the frame.
[0011] As a preferred embodiment, a vertical front support axle is provided at the top of the front wheel frame, and a vertical support axle sleeve is provided at the corresponding position of the lower support assembly. The front wheel shock absorber is a shock-absorbing spring sleeved on the front support axle, with both ends of the shock-absorbing spring abutting against the end face of the support axle sleeve and the end face of the front wheel frame, respectively. This design optimizes the structural design of the front wheel shock absorber. The shock absorber, being a shock-absorbing spring sleeved on the front support axle of the front wheel frame, provides excellent shock absorption at the front wheel position.
[0012] As a preferred embodiment, the chair back shock absorber includes an upper shock-absorbing plate sleeved and fixed to the outer periphery of the lower crossbeam of the chair back, and a lower shock-absorbing plate rotatably connected at its end to the upper shock-absorbing plate. The lower shock-absorbing plate abuts against the upper crossbeam of the rear wheel, and a shock-absorbing spring is provided between the upper and lower shock-absorbing plates to separate them. This design provides a preferred chair back shock absorber design, in which the shock absorber is clamp-shaped with one end rotatably connected. The outer sides of the upper and lower shock-absorbing plates are respectively connected to the lower crossbeam of the chair back and the upper crossbeam of the rear wheel. A shock-absorbing spring is provided between the two shock-absorbing plates to widen the included angle, effectively providing elastic support.
[0013] As a preferred embodiment, the lower side of the shock-absorbing lower seat plate is provided with a support groove, the shape of which conforms to the shape of the outer peripheral wall of the rear wheel upper crossbeam; the shock-absorbing spring is located at the opposite end of the connection position between the shock-absorbing upper seat plate and the shock-absorbing lower seat plate, and the support groove is located between the shock-absorbing spring and the rotatable connection position. Based on the above design structure, the backrest shock absorber is further optimized by utilizing the lever principle to increase the torque at the shock-absorbing spring position, thereby improving the elasticity of the support.
[0014] As a preferred embodiment, a locking mechanism is provided between the two seatback shock absorbers. The locking mechanism includes axle structures fixedly connected to the upper rear wheel crossbeam and the lower seatback crossbeam, respectively. The two axle structures are fastened together by elastic fasteners to limit the distance between the upper rear wheel crossbeam and the lower seatback crossbeam to a preset range. This design, by providing a locking mechanism connecting the upper rear wheel crossbeam and the lower seatback crossbeam near the seatback shock absorber, increases the distance limitation between the two beams. The elastic fasteners facilitate the connection of the axle structures of the two beams and allow for disassembly to release the restriction, enabling the frame to be folded.
[0015] As a preferred embodiment, both the rear wheel crossbeam and the front footrest bracket are equipped with hinge platforms, and a bracket connecting rod connects the two hinge platforms. This design further optimizes the frame support structure, increasing the stability of the frame after it is fixed by adding a bracket connecting rod. Attached Figure Description
[0016] Figure 1A schematic diagram of the overall structure of an electric wheelchair provided by this utility model;
[0017] Figure 2 for Figure 1 A schematic diagram of the frame structure on the other side of the electric wheelchair;
[0018] Figure 3 for Figure 1 A partial structural diagram of the area near the shock absorber on the backrest of an electric wheelchair.
[0019] Figure 4 for Figure 4 A partial structural diagram of the other side of the seat back shock absorber location;
[0020] in, Figures 1-4 middle:
[0021] 1. Upper support assembly; 1-1. Lower crossbeam of the backrest; 1-2. Seat cushion support; 2. Lower support assembly; 2-1. Upper crossbeam of the rear wheel; 2-2. Rear wheel support beam; 2-3. Support connecting rod; 2-4. Front wheel frame; 2-5. Front footrest support; 2-6. Support bushing; 3. Backrest shock absorber; 3-1. Upper shock-absorbing seat plate; 3-2. Lower shock-absorbing seat plate; 3-3. Support groove; 4. Seat cushion shock absorber; 5. Front wheel shock absorber; 6. Locking mechanism; 7. Hinge shaft; 8. Shock-absorbing spring. Detailed Implementation
[0022] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.
[0023] Before providing a detailed explanation of the working principle of this utility model, further clarification is needed regarding its description: In this description, terms such as "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, an indirect connection through an intermediate medium, or a welded connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0025] refer to Figures 1-4 The following examples illustrate this. Figure 1 A schematic diagram of the overall structure of an electric wheelchair provided by this utility model; Figure 2 for Figure 1 A schematic diagram of the frame structure on the other side of the electric wheelchair; Figure 3 for Figure 1 A partial structural diagram of the area near the shock absorber on the backrest of an electric wheelchair. Figure 4 for Figure 4 A partial structural diagram of the other side of the seat back shock absorber location.
[0026] This utility model provides an electric wheelchair, including an upper support assembly 1 and a lower support assembly 2 connected to each other. The upper support assembly 1 includes a backrest and a seat cushion for load-bearing, and the lower support assembly 2 is used to support and connect the wheel assembly. Two vertical backrest shock absorbers 3 are symmetrically connected to the lower support assembly 2 on one side of the backrest of the upper support assembly 1. Two vertical seat cushion shock absorbers 4 are symmetrically connected to the lower support assembly 2 on the side of the seat cushion opposite to the backrest. A pair of front wheel frames 2-4 are symmetrically connected to the lower support assembly 2 on one side of the seat cushion shock absorbers 4. Front wheel shock absorbers 5 are provided at the connection positions of the front wheel frames 2-4 and the lower support assembly 2.
[0027] The technical solution provided by this utility model optimizes the shock absorption distribution at the connection points based on the traditional wheelchair structural design. Specifically, two backrest shock absorbers 3 are set on the backrest side of the upper support assembly 1 and the lower support assembly 2, and two seat cushion shock absorbers 4 are set on the opposite side, i.e., the wheelchair footrest side. As a supplement, a front wheel shock absorber 5 is set between the connection point of the front wheel frame 2-4 and the lower support assembly 2. All three types of shock absorbers are set vertically. Vertical can be understood as the direction perpendicular to the ground when the wheelchair is in normal use. Compared with the prior art, the number of shock absorbers is increased, making the distribution of shock absorbers on the wheelchair frame more dense, which effectively improves the shock absorption effect of the wheelchair and solves the technical problems of insufficient shock absorption, poor riding experience and easy damage to the vehicle structure in the existing electric wheelchair design.
[0028] In the technical solution provided in this embodiment, the upper support assembly 1 includes a backrest frame for supporting the chair back. A lower backrest crossbeam 1-1 is fixedly connected to the bottom of the backrest frame. The lower support assembly 2 includes a pair of rear wheel support beams 2-2, with an upper rear wheel crossbeam 2-1 pinned between the two rear wheel support beams 2-2. The chair back shock absorber 3 is disposed between the lower backrest crossbeam 1-1 and the upper rear wheel crossbeam 2-1. This design optimizes the support structure. The lower backrest crossbeam 1-1 and the rear wheel support beams 2-2 are important support components of the wheelchair support. The placement of the chair back shock absorber 3 between them effectively optimizes the shock absorption effect near the chair back.
[0029] In the technical solution provided in this embodiment, the lower support assembly 2 includes front footrest brackets 2-5 that are hinged to the two rear wheel support beams 2-2 on both sides, with a hinge shaft 7 provided at the hinge position. The upper support assembly 1 includes a seat cushion bracket 1-2 that is hinged to the seat back bracket on one side. The two ends of the seat cushion shock absorber 4 abut against the outer peripheral walls of the seat cushion bracket 1-2 and the hinge shaft 7, respectively. This design optimizes the connection position of the seat cushion shock absorber 4. The front footrest bracket 2-5 is hinged to the rear wheel support beam 2-2, increasing the mobility of the frame. The hinge shaft 7 at the hinge position connects the seat cushion shock absorber 4, which can optimize the balance of the front and rear shock absorption of the frame.
[0030] In the technical solution provided in this embodiment, a vertical front support shaft is provided at the top of the front wheel frame 2-4, and a vertical support shaft sleeve 2-6 is provided at the corresponding position of the lower support assembly 2. The front wheel shock absorber 5 is a shock-absorbing spring 8 sleeved on the front support shaft, and the two ends of the shock-absorbing spring 8 abut against the end face of the support shaft sleeve 2-6 and the end face of the front wheel frame 2-4, respectively. This design optimizes the structural design of the front wheel shock absorber 5. The shock absorber is a shock-absorbing spring 8 sleeved on the front support shaft of the front wheel frame 2-4, and this shock absorption design can achieve a good shock absorption effect at the front wheel position.
[0031] In the technical solution provided in this embodiment, the backrest shock absorber 3 includes an upper shock-absorbing plate 3-1 sleeved and fixed to the outer peripheral wall of the lower crossbeam 1-1 of the backrest, and a lower shock-absorbing plate 3-2 rotatably connected at its end to the upper shock-absorbing plate 3-1. The lower shock-absorbing plate 3-2 abuts against the upper crossbeam 2-1 of the rear wheel. A shock-absorbing spring 8 is provided between the upper shock-absorbing plate 3-1 and the lower shock-absorbing plate 3-2 to separate them. This design provides a preferred design for the backrest shock absorber 3, in which the shock absorber is clamp-shaped with one end rotatably connected. The outer sides of the upper shock-absorbing plate 3-1 and the lower shock-absorbing plate 3-2 are respectively connected to the lower crossbeam 1-1 of the backrest and the upper crossbeam 2-1 of the rear wheel. A shock-absorbing spring 8 is provided between the two shock-absorbing plates to increase the included angle, effectively providing elastic support.
[0032] In the technical solution provided in this embodiment, a support groove 3-3 is provided on the lower side of the shock-absorbing lower seat plate 3-2. The shape of the support groove 3-3 is in concave-convex fit with the outer peripheral wall shape of the rear wheel upper crossbeam 2-1. The shock-absorbing spring 8 is located at the opposite end of the connection position between the shock-absorbing upper seat plate 3-1 and the shock-absorbing lower seat plate 3-2, and the support groove 3-3 is located between the shock-absorbing spring 8 and the rotatable connection position. Based on the above design structure, the backrest shock absorber 3 is further optimized by using the lever principle to increase the torque at the position of the shock-absorbing spring 8 and improve the elasticity of the support.
[0033] In the technical solution provided in this embodiment, a locking mechanism 6 is provided between the two seat back shock absorbers 3. The locking mechanism 6 includes axle platform structures that are fixedly connected to the upper rear wheel crossbeam 2-1 and the lower seat back crossbeam 1-1, respectively. The two axle platform structures are fastened together by elastic fasteners to limit the distance between the upper rear wheel crossbeam 2-1 and the lower seat back crossbeam 1-1 to a preset spacing range. This design provides a locking mechanism 6 connecting the upper rear wheel crossbeam 2-1 and the lower seat back crossbeam 1-1 near the seat back shock absorber 3. The locking mechanism 6 increases the distance limitation between the two beams. The elastic fasteners can easily connect the axle platform structures of the two beams, and the elastic fasteners can be removed to release the limitation, so that the frame can be folded.
[0034] In the technical solution provided in this embodiment, both the rear wheel upper crossbeam 2-1 and the front footrest bracket 2-5 are provided with hinge platforms, and a bracket connecting rod 2-3 connects the two hinge platforms. This design further optimizes the frame support structure and improves the stability of the frame after it is fixed by adding the bracket connecting rod 2-3.
[0035] Although the present invention has been disclosed above, its protection scope is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this disclosure, and all such changes and modifications will fall within the protection scope of this invention.
Claims
1. An electrically powered wheelchair comprising an upper frame assembly (1) and a lower frame assembly (2) connected to each other, said upper frame assembly (1) comprising a backrest and a seat cushion for carrying a load, said lower frame assembly (2) for supporting a connected wheel set, characterized in that, Two vertical seat back shock absorbers (3) are symmetrically connected between the upper support assembly (1) and the lower support assembly (2) on one side of the seat back, and two vertical seat cushion shock absorbers (4) are symmetrically connected between the lower side of the seat cushion away from the seat back and the lower support assembly (2).
2. The electrically powered wheelchair vehicle of claim 1, wherein, The upper support assembly (1) comprises a seat back frame for supporting the seat back, and a seat back lower cross beam (1-1) is fixedly connected to the bottom of the seat back frame; the lower support assembly (2) comprises a pair of rear wheel support beams (2-2), and a rear wheel upper cross beam (2-1) is hingedly connected between the two rear wheel support beams (2-2); and the seat back shock absorber (3) is arranged between the seat back lower cross beam (1-1) and the rear wheel upper cross beam (2-1).
3. The electrically powered wheelchair vehicle of claim 2, wherein, The lower support assembly (2) comprises a front foot support (2-5) hingedly connected to the two rear wheel support beams (2-2) on the two sides, respectively, and a hinge shaft (7) is arranged at the hinged position; the upper support assembly (1) comprises a seat cushion support (1-2) hingedly connected to the seat back support on one side; and the two ends of the seat cushion shock absorber (4) are respectively in abutment with the outer peripheral wall of the seat cushion support (1-2) and the hinge shaft (7).
4. The electrically powered wheelchair vehicle of claim 3, wherein, The top end of the front wheel frame (2-4) is provided with a vertical front support shaft, the corresponding position of the lower support assembly (2) is provided with a vertical support shaft sleeve (2-6), and the front wheel shock absorber (5) is a shock absorbing spring (8) sleeved on the front support shaft; the two ends of the shock absorbing spring (8) are respectively in abutment with the end face of the support shaft sleeve (2-6) and the end face of the front wheel frame (2-4).
5. The electrically powered wheelchair vehicle of claim 2, wherein, The seat back shock absorber (3) comprises a shock absorbing upper seat plate (3-1) fixedly sleeved on the outer peripheral wall of the seat back lower cross beam (1-1), and a shock absorbing lower seat plate (3-2) rotationally connected to the end of the shock absorbing upper seat plate (3-1); the shock absorbing lower seat plate (3-2) is in abutment with the rear wheel upper cross beam (2-1), and a shock absorbing spring (8) is arranged between the shock absorbing upper seat plate (3-1) and the shock absorbing lower seat plate (3-2) for supporting the two.
6. The electrically powered wheelchair vehicle of claim 5, wherein, A support groove (3-3) is arranged on the lower side of the shock absorbing lower seat plate (3-2), and the shape of the support groove (3-3) is matched with the shape of the outer peripheral wall of the rear wheel upper cross beam (2-1); the shock absorbing spring (8) is located at the other end opposite to the connection position of the shock absorbing upper seat plate (3-1) and the shock absorbing lower seat plate (3-2), and the support groove (3-3) is located between the shock absorbing spring (8) and the rotationally connected position.
7. The electrically powered wheelchair vehicle of claim 5, wherein, Two said chair back shock absorbers (3) are provided with a lock mechanism (6), the lock mechanism (6) includes shaft table structure fixedly connected with the rear wheel upper cross beam (2-1) and the chair back lower cross beam (1-1) respectively, two said shaft table structures are buckled through elastic fastener, used to limit the distance between the rear wheel upper cross beam (2-1) and the chair back lower cross beam (1-1) to a preset interval range.
8. The electrically powered wheelchair vehicle of claim 3, wherein, The rear wheel upper cross beam (2-1) and the front pedal support (2-5) are provided with hinged tables, and the hinged tables of the two are connected by a support connecting rod (2-3).