Chair frame damping structure for wheelchair

Abstract

A chair frame damping structure for a wheelchair comprises a chair frame body and two sets of rear wheel damping mechanisms, the two sets of rear wheel damping mechanisms are symmetrically installed on the two sides of the rear portion of the chair frame body respectively, and two rear wheels of the wheelchair are installed on the two sets of rear wheel damping mechanisms on the rear portion respectively. The rear wheel damping mechanisms are arranged on the two sides of the rear portion of the chair frame body, the rear wheels of the wheelchair are installed on the rear wheel damping mechanisms, the rear wheel damping mechanisms are formed by combining the cantilevers, the first dampers and the axle seats, the structure is relatively simple, the assembly and replacement difficulty is effectively lowered, and the follow-up maintenance cost is reduced; in addition, the seat shock absorption mechanism secondarily absorbs and buffers shock through a second shock absorber and a buffer pad, and the influence of the shock on the user is further reduced; and finally, the arch structure design of the chair frame main body with the low front part and the high rear part is matched with the reasonable position arrangement of the support frame, the buffer pad and the second shock absorber hinge seat, so that the whole structure is more reasonable, and the comfort and the use convenience of the wheelchair are comprehensively improved.

Description

Technical Field

[0001] This utility model relates to the field of wheelchair technology, specifically to a shock-absorbing structure for a wheelchair frame. Background Technology

[0002] As a device providing convenience for people with mobility impairments, wheelchairs are increasingly in demand. Consumers' requirements for wheelchairs have expanded beyond mere ease of travel; they also demand greater comfort, especially when traversing bumpy or uneven roads. While some wheelchairs on the market now feature shock absorption, their shock absorption structures often have several problems. For example, a suspended shock-absorbing wheel disclosed in utility model patent application number 202420806762.X designs the two rear wheels as a suspended structure, which effectively absorbs vibrations and reduces wheelchair vibration. However, this suspended shock absorption structure has many components and a complex structure, making assembly and replacement difficult, and subsequent maintenance costs high, failing to meet consumers' demands for both shock absorption performance and ease of use. Utility Model Content

[0003] In order to overcome the shortcomings of the prior art, this utility model provides a shock-absorbing structure for a wheelchair frame.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] A shock-absorbing structure for a wheelchair frame includes a frame body and a rear wheel shock-absorbing mechanism. Two sets of the rear wheel shock-absorbing mechanism are symmetrically installed on both sides of the rear of the frame body. The two rear wheels of the wheelchair are respectively mounted on the two sets of rear wheel shock-absorbing mechanisms at the rear. Each rear wheel shock-absorbing mechanism includes a cantilever, a first shock absorber, and a wheel axle seat. The rear end of the cantilever is hinged to the lower side of the rear of the frame body via a hinge seat, and the front end of the cantilever extends forward. The first shock absorber connects the cantilever and the frame body. The wheel axle seat is installed on the lower side of the cantilever, and the rear wheels of the wheelchair are mounted on the wheel axle seat via a pivot.

[0006] Furthermore, a mounting plate is provided on the lower side of the cantilever, and the wheel axle seat is adjustablely mounted on the mounting plate. The wheel axle seat has multiple mounting holes along the cantilever direction, and the wheel axle seat is adjusted by being fixed to different mounting holes.

[0007] In this utility model, a seat shock absorption mechanism is also installed on the upper part of the chair frame body. The wheelchair seat is installed on the seat shock absorption mechanism. The seat shock absorption mechanism includes a support frame for mounting the seat, a second shock absorber for absorbing the vibration of the support frame, and a buffer pad for cushioning the support frame. The front end of the support frame is hinged to the front part of the chair frame body, and the rear end of the support frame is connected to the upper part of the rear of the chair frame body through the second shock absorber and forms a support. The buffer pad is fixed to the top of the chair frame body and located below the support frame.

[0008] Furthermore, the upper end of the second shock absorber is hinged to the support frame, and the lower end of the second shock absorber is fixed to the chair frame body through a hinge seat.

[0009] In this utility model, the rear part of the chair frame body is provided with an arc-shaped arched structure, so that the chair frame body is low in the front and high in the back, and the rear wheel shock absorption mechanism is installed below the arched structure.

[0010] Furthermore, the support frame includes a front arc-shaped downward extending hinge portion and a rear horizontally extending rear support portion. The end of the hinge portion is hinged to the chair frame body, and the wheelchair seat is fixed to the support portion.

[0011] Furthermore, the buffer pad is positioned at the highest point of the arched structure and is vertically installed, and the hinge seat at the bottom of the second shock absorber is fixed to the arched structure and located at the rear of the buffer pad.

[0012] Furthermore, anti-rollover wheels are provided at the rear end of the arched structures on both sides, and the anti-rollover wheels are located at the rear of the rear wheel shock absorption mechanism.

[0013] This utility model has the following advantages and beneficial effects:

[0014] By incorporating rear wheel shock absorption mechanisms on both sides of the rear of the chair frame, the wheelchair's rear wheels are mounted on these mechanisms. These mechanisms utilize a combination of cantilever arms, a first shock absorber, and axle seats, resulting in a relatively simple structure that effectively reduces assembly and replacement difficulty and subsequent maintenance costs. Furthermore, the seat shock absorption mechanism uses a second shock absorber and cushioning pad to absorb and buffer vibrations, further minimizing their impact on the user. Finally, the arched design of the chair frame, with its lower front and higher rear, combined with the rational placement of the support frame, cushioning pad, and second shock absorber hinge seats, makes the overall structure more rational, comprehensively improving the wheelchair's comfort and ease of use. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0016] Figure 1 This is a schematic diagram of the wheelchair in this embodiment;

[0017] Figure 2 This is a schematic diagram of the main body of the chair frame in this embodiment;

[0018] Figure 3 This is a side view of the main body of the chair frame in this embodiment;

[0019] Figure 4 This is a side view of the wheelchair in this embodiment. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. However, this utility model is not limited to the following embodiments.

[0021] It should be noted that if any directional indication (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial, etc.) is involved in the embodiments of this utility model, the directional indication is only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0022] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0023] like Figures 1 to 4As shown, this embodiment discloses a shock-absorbing structure for a wheelchair frame, including a frame body 1 and a rear wheel shock-absorbing mechanism 2. Two sets of the rear wheel shock-absorbing mechanism 2 are symmetrically installed on both sides of the rear of the frame body 1. The two sets of rear wheel shock-absorbing mechanisms 2 operate independently. The two front wheels of the wheelchair are installed on both sides of the front end of the frame body 1, and the two rear wheels are respectively installed on the two sets of rear wheel shock-absorbing mechanisms 2 at the rear. The wheelchair seat is installed on the upper part of the frame body 1. Specifically, the rear wheel shock-absorbing mechanism 2 includes a cantilever 21, a first shock absorber 22, and a wheel axle seat 23. The rear end of the cantilever 21 is hinged to the lower side of the rear of the frame body 1 via a hinge seat 20, while the front end of the cantilever 21 extends forward, which can be horizontal or... The first shock absorber 22 is connected between the cantilever 21 and the chair frame body 1. Specifically, the hinge seats 20 are respectively hinged to both ends of the first shock absorber 22. The hinge seats 20 at both ends are fixed to the upper front end of the cantilever 21 and the lower side of the chair frame body 1 by welding. The wheel axle seat 23 is installed on the lower side of the cantilever 21. The rear wheels of the wheelchair are installed on the wheel axle seat 23 through a pivot. When the rear wheels of the wheelchair encounter an uneven road surface and bump, the rear wheels drive the cantilever 21 to swing up and down around the rear hinge seat 20. The first shock absorber 22, located between the front end of the cantilever 21 and the chair frame body 1, absorbs this swing, thereby reducing the vibration caused by the bumpy road surface to the wheelchair and improving the comfort of the wheelchair.

[0024] Furthermore, to facilitate the installation of the wheel axle seat 23, a mounting plate 24 is provided on the lower side of the cantilever 21. The wheel axle seat 23 can be adjusted and mounted on the mounting plate 24. Specifically, multiple mounting holes are provided on the wheel axle seat 23 along the direction of the cantilever 21. The wheel axle seat 23 can be fixed in different mounting holes to achieve position adjustment. Installing the wheel axle seat 23 in different positions can change the wheelbase of the front and rear wheels of the wheelchair. For wheelchairs with a short wheelbase, the turning radius is reduced, making the wheelchair easier to operate in narrow spaces and suitable for indoor or crowded environments. For wheelchairs with a long wheelbase, the center of gravity distribution of the wheelchair is more even, and the anti-tipping ability is improved, making it suitable for use on flat or bumpy roads.

[0025] In this embodiment, when the rear wheel shock absorption mechanism 2 cannot completely absorb the vibration, it will transmit the vibration to the chair frame body 1, and then from the chair frame body 1 to the seat, causing vibration to the user. To avoid this, a seat shock absorption mechanism 3 is also installed on the upper part of the chair frame body 1. The wheelchair seat is installed on the seat shock absorption mechanism 3. The seat shock absorption mechanism 3 specifically includes a support frame 31 for mounting the seat, a second shock absorber 32 for absorbing the vibration of the support frame 31, and a cushioning pad 33 for buffering the support frame 31. The front end of the support frame 31 is hinged to the front part of the chair frame body 1, and the rear end of the support frame 31 is connected to the front part of the chair frame body 1. The second shock absorber 32 is connected to the upper rear of the chair frame body 1 and forms a support. The buffer pad 33 is fixed to the top of the chair frame body 1 and located below the support frame 31. Specifically, the upper end of the second shock absorber 32 is hinged to the support frame 31, and the lower end of the second shock absorber 32 is fixed to the chair frame body 1 through the hinge seat 20. When the vibration on the road is transmitted to the chair frame body 1, the second shock absorber 32 can absorb the vibration a second time, preventing the vibration from being transmitted to the wheelchair seat and further improving the comfort of the wheelchair. The buffer can prevent the support frame 31 from having a rigid collision with the chair frame body 1 and improve the structural stability.

[0026] Furthermore, the rear of the chair frame body 1 is provided with an arc-shaped arched structure 11, thereby making the chair frame body 1 lower in the front and higher in the back. Specifically, the chair frame body 1 is welded from multiple hollow steel pipes, and the steel pipes on both sides extend from the front end to the rear, first bending upward and then bending downward, thus forming the arched structure 11. The rear wheel shock absorption mechanism 2 is installed below the arched structure 11. Since the chair frame body 1 is lower in the front and higher in the back, the support frame 31 includes a hinge part 311 extending downward in an arc shape on the front side and a support part 312 extending horizontally backward on the rear side. The end of the hinge part 311 is hinged to the chair frame body 1, and the wheelchair seat is fixed to the support part 312. In addition, the buffer pad 33 is set at the highest point of the arched structure 11 and is vertically arranged. The hinge seat 20 at the bottom of the second shock absorber 32 is fixed to the arched structure 11 and is located at the rear of the buffer pad 33.

[0027] In this embodiment, in order to improve the stability of the wheelchair, anti-tipping wheels 12 are provided at the rear end of the arched structures 11 on both sides. The anti-tipping wheels 12 are located at the rear of the rear wheel shock absorption mechanism 2 to prevent the wheelchair from tipping over.

[0028] In this embodiment, the two front wheels of the wheelchair also have shock absorption function. The specific structure of the front wheels can be referred to the control method of an intelligent wheelchair disclosed in the invention patent application No. 202310287458.9. The shock absorption device mentioned in paragraph

[0025] of the specification of that patent will not be described in detail here.

[0029] The above description in this specification is merely an illustrative example of the present invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the specific embodiments described or adopt similar methods to replace them, as long as they do not deviate from the content of this specification or exceed the scope defined in the claims, they shall all fall within the protection scope of this invention.

Claims

1. A shock-absorbing structure for a wheelchair frame, comprising a frame body (1) and a rear wheel shock-absorbing mechanism (2), characterized in that, The rear wheel shock absorption mechanism (2) is provided in two sets and is symmetrically installed on both sides of the rear of the chair frame body (1). The two rear wheels of the wheelchair are respectively installed on the two sets of rear wheel shock absorption mechanisms (2) at the rear. The rear wheel shock absorption mechanism (2) includes a cantilever (21), a first shock absorber (22) and a wheel axle seat (23). The rear end of the cantilever (21) is hinged to the lower side of the rear of the chair frame body (1) through a hinge seat (20). The front end of the cantilever (21) extends forward. The first shock absorber (22) is connected between the cantilever (21) and the chair frame body (1). The wheel axle seat (23) is installed on the lower side of the cantilever (21). The rear wheels of the wheelchair are installed on the wheel axle seat (23) through a pivot.

2. The shock-absorbing structure for a wheelchair frame according to claim 1, characterized in that, A mounting plate (24) is provided on the lower side of the cantilever (21). The wheel axle seat (23) is adjustablely mounted on the mounting plate (24). The wheel axle seat (23) has multiple mounting holes along the direction of the cantilever (21). The wheel axle seat (23) is adjusted by being fixed on different mounting holes.

3. The shock-absorbing structure for a wheelchair frame according to claim 1, characterized in that, The upper part of the chair frame body (1) is also equipped with a seat shock absorption mechanism (3). The chair seat of the wheelchair is installed on the seat shock absorption mechanism (3). The seat shock absorption mechanism (3) includes a support frame (31) for installing the seat, a second shock absorber (32) for absorbing the vibration of the support frame (31), and a buffer pad (33) for buffering the support frame (31). The front end of the support frame (31) is hinged to the front part of the chair frame body (1). The rear end of the support frame (31) is connected to the upper part of the rear of the chair frame body (1) through the second shock absorber (32) and forms a support. The buffer pad (33) is fixed to the top of the chair frame body (1) and located below the support frame (31).

4. A shock-absorbing structure for a wheelchair frame according to claim 3, characterized in that, The upper end of the second shock absorber (32) is hinged to the support frame (31), and the lower end of the second shock absorber (32) is fixed to the chair frame body (1) through the hinge seat (20).

5. A shock-absorbing structure for a wheelchair frame according to claim 3, characterized in that, The rear of the chair frame body (1) is provided with an arc-shaped arched structure (11) so that the chair frame body (1) is low in the front and high in the back. The rear wheel shock absorption mechanism (2) is installed below the arched structure (11).

6. A shock-absorbing structure for a wheelchair frame according to claim 5, characterized in that, The support frame (31) includes a hinge portion (311) extending downward in an arc shape on the front side and a support portion (312) extending horizontally backward on the rear side. The end of the hinge portion (311) is hinged to the chair frame body (1), and the seat of the wheelchair is fixed to the support portion (312).

7. A shock-absorbing structure for a wheelchair frame according to claim 5, characterized in that, The buffer pad (33) is set at the highest point of the arched structure (11) and is vertically installed. The hinge seat (20) at the bottom of the second shock absorber (32) is fixed on the arched structure (11) and located at the rear of the buffer pad (33).

8. A shock-absorbing structure for a wheelchair frame according to claim 5, characterized in that, Anti-rollover wheels (12) are also provided at the rear end of the arched structures (11) on both sides, and the anti-rollover wheels (12) are located at the rear of the rear wheel shock absorption mechanism (2).

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