Folding wheelchair

Abstract

A folding wheelchair, comprising a backrest frame hingedly connected to the rear end of a cushion frame (11), wherein a support frame is foldably connected to the lower side of the cushion frame (11); the support frame comprises rear support rods (13); the rear support rods (13) gradually extend downwards from front to back; the front end of each rear support rod (13) is hingedly connected to the cushion frame (11) or a corresponding front support rod (12); an auxiliary rod (10) extending upwards is provided at the position of each rear support rod (13) deviating from the rear end; the backrest frame has vertical rods (2) extending downwards; the position of each vertical rod (2) deviating from the lower end is hingedly connected to the corresponding auxiliary rod (10); a fixing hook (3) is hingedly connected to the lower end of each vertical rod (2); each rear support rod (13) is provided with a component (4); each component (4) is provided with a recess portion (41) matching a hook portion (31) of the corresponding fixing hook (3); each fixing hook (3) is provided with an elastic member (33); when each hook portion (31) is located in the corresponding recess portion (41), the hook portion (31) abuts against the recess wall of the recess portion (41) under the action of the corresponding elastic member (33); and each vertical rod (2) is close to or in contact with the rear end surface of the corresponding component (4). The folding wheelchair has high structural strength and high stability when in use.

Description

Folding wheelchair Technical Field

[0001] The invention relates to a folding wheelchair. Background Art

[0002] Chinese patent application number 202122400029.7 discloses a folding wheelchair, including a backrest frame hinged to the rear end of a seat cushion frame, and a support frame is folded and connected to the lower side of the seat cushion frame. The support frame includes rear support rods located on the left and right sides of the seat cushion frame and extending downward from front to rear. A rear frame extending upward is fixed between the rear ends of the two rear support rods. The left and right sides of the backrest frame have downward extending extension sections, and a connecting rod extending in the left and right directions is connected between the two extension sections. A connecting block is fixed to the upper end of the rear frame, and the connecting block is formed with a support notch that opens upward and passes through the left and right sides.

[0003] When the wheelchair backrest is unfolded, that is, when the wheelchair is in use, the connecting rod of the backrest is supported in the support notch of the connecting block; when the user sits on the wheelchair and applies force to the backrest, the connecting rod of the backrest will swing forward with the hinge between the backrest and the seat cushion frame as the center, and then resist against the connecting block.

[0004] The transversely arranged connecting rod of the above-mentioned solution is arranged at the lower end of the backrest frame, and the rear frame body with the connecting block is arranged on the rear support rod. When the wheelchair of the present invention is in use, the distance between the lower end support of the backrest frame and the backrest frame and the rear support rod is relatively far. Since the wheelchair components are made of lighter hollow materials, the rear structural strength of the wheelchair will be further reduced and the stability will be poor. Technical issues

[0005] The object of the present invention is to provide a folding wheelchair with high structural strength and high stability during use. Technical Solutions

[0006] The foldable wheelchair of claim 1, wherein the foldable wheelchair comprises a backrest frame hingedly connected to the rear end of the seat cushion frame, the seat cushion frame being folded and connected to the support frame at the lower side of the seat cushion frame, the support frame comprising a front support rod and a rear support rod located at the lower side of the seat cushion frame, the front support rod having a lower end connected to the front wheel, the rear support rod having a lower end connected to the rear wheel, the rear support rod extending gradually downward from the front to the rear

[0007] When the wheelchair is unfolded, the hook is located in the groove of the component, and the fixed hook hooks the component, thereby realizing the connection between the backrest frame and the support frame; when the wheelchair is in use, if the backrest frame is subjected to force, the lower end of the vertical rod will swing forward and thus counteract the rear end surface of the component, so that the lower end of the backrest frame is directly supported on the rear support rod of the support frame, and the component can be set smaller, which can minimize the deformation, thereby ensuring the overall stability and structural strength of the folding wheelchair.

[0008] Preferably, the front end of the fixing hook forms an upwardly curved hook portion, the front end surface of the upper end of the hook portion having a hook guide slope, the lower portion of the component forms a rearwardly open mating groove that communicates with the groove portion, the groove portion being located at the upper portion of the component, and the upper side wall of the mating groove forming a component guide slope for mating with the hook guide slope. The provision of the hook guide slope and the component guide slope facilitates the forward movement of the hook portion of the fixing hook into the mating groove and then into the groove portion, thereby facilitating the deployment of the wheelchair.

[0009] Preferably, the middle portion of the fixing hook is hinged to the vertical rod, and the front and rear ends of the fixing hook are respectively provided with a hook portion and a handle portion. The handle portion is provided to facilitate the user to apply force to rotate the fixing hook, thereby facilitating the fixing hook to disengage from the component to achieve a locking structure, thereby facilitating subsequent folding of the wheelchair.

[0010] Preferably, a side stop extending rearward is provided on the side of the member. When the hook is located within the groove, the side stop is located outside the fixed hook. When the wheelchair turns, the side stop limits the swinging of the lower end of the vertical rod, preventing the fixed hook from separating from the member, thereby ensuring the stability of the wheelchair of the present invention. The side away from the wheelchair is considered the outside.

[0011] Preferably, the seat frame is provided with the vertical rod and the support rod on both sides, and the fixing hooks at the lower ends of the two vertical rods are connected and fixed by a connecting rod. The provision of the connecting rod increases the strength and stability of the entire wheelchair structure, and enables the two fixing hooks to rotate synchronously, facilitating the fixing hooks to cooperate with the components and facilitating the user's locking and releasing operations when the wheelchair is folded.

[0012] Preferably, the vertical rod is provided with a hinge groove, the fixing hook is hinged at the hinge groove, and the fixing hook has a limiting protrusion extending upward for contacting the wall of the hinge groove. The limiting protrusion is provided to prevent the fixing hook from swinging excessively, thereby facilitating the hook portion of the fixing hook to enter the groove portion of the component.

[0013] Preferably, the lower end of the auxiliary rod is hinged to the rear support rod, and the hinge of the auxiliary rod and the rear support rod is located on the front side of the component. The auxiliary rod is hinged to the rear support rod, which can make the wheelchair of the present invention smaller in space after folding and more compact in structure.

[0014] Preferably, the vertical rod is directly or indirectly hinged to the rear end of the auxiliary frame, and the front end of the auxiliary frame is directly or indirectly hinged to the front support rod. A space for accommodating the battery box and controller is defined between the auxiliary frame and the seat cushion frame. The auxiliary frame not only enhances the overall structural strength of the wheelchair but also serves to house components such as the battery box, minimizing the space occupied by the wheelchair when folded. Beneficial effects

[0015] The present invention has the advantages of high structural strength and high stability during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] FIG1 is a schematic structural diagram of a wheelchair without the left rear wheel when unfolded according to the present invention.

[0017] FIG2 is a schematic structural diagram of the fixing hooks and components of the wheelchair of the present invention when unfolded. Best Mode for Carrying Out the Invention

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0019] As shown in Figures 1 and 2, this embodiment discloses a folding wheelchair, including a backrest frame hinged to the rear end of a seat cushion frame 11, and a support frame is folded and connected to the lower side of the seat cushion frame 11. The support frame includes a front support rod 12 and a rear support rod 13 located on the lower side of the seat cushion frame 11, the front support rod 12 is connected to the front wheel 14, and the lower end of the rear support rod 13 is connected to the rear wheel 15. The rear support rod 13 gradually extends downward from front to rear, and the front end of the rear support rod 13, the front end of the seat cushion frame 11 and the upper end of the front support rod 12 are hinged.

[0020] Among them, the support frame of the folding wheelchair of this embodiment includes a front support rod 12 and a rear support rod 13 located on the left and right sides, and a cross bar 16 is connected between the lower ends of the two front support rods 12 and the rear ends of the two rear support rods 13. An auxiliary frame 17 is provided between the front and rear cross bars 16, and the front and rear ends of the auxiliary frame 17 are hinged to the cross bars 16. A battery box 18 and a controller 19 are placed on the auxiliary frame 17, which are spaced apart in the front and rear directions.

[0021] The rear support rod 13 is hinged to the lower end of the upwardly extending auxiliary rod 10 at a point offset from the rear end. The backrest frame has downwardly extending vertical rods 2 on both sides. The vertical rods 2 are hinged to the auxiliary rod 10 at a point offset from the lower end. A fixing hook 3 is hinged to the lower end of each vertical rod 2. A component 4 is integrally formed on the rear support rod 13. The hinge point between the auxiliary rod 10 and the rear support rod 13 is located at the front side of the component 4. The component 4 has a groove 41 that cooperates with the hook portion 31 of the fixing hook 3. The fixing hook 3 is equipped with an elastic member 33. When the hook portion 31 is located in the groove 41, the elastic member 33 acts on the hook portion 31 to abut against the groove wall of the groove 41, and the lower end of the vertical rod 2 contacts the rear end surface of the component 4. The elastic member 33 in this embodiment is a torsion spring.

[0022] The lower end of the vertical rod 2 is provided with a hinge slot 21 that runs through the front and back and opens downward. The fixed hook 3 is hinged at the hinge slot 21. The front end of the fixed hook 3 has a limit protrusion 30 that extends upward to contact the top wall of the hinge slot 21. The front end of the fixed hook 3 forms a hook portion 31 that bends forward and upward, and the rear end of the fixed hook 3 forms a handle portion 32 that extends backward. A horizontal connecting rod 34 is connected between the handle portions 32 of the two fixed hooks 3. The front end surface of the upper end of the hook portion 31 has a hook guide slope 35.

[0023] The lower portion of the member 4 forms a rearwardly opening mating slot 42 that communicates with the groove portion 41. The groove portion 41 is located at the upper portion of the member 4. The upper sidewall of the mating slot 42 forms a member guide slope 43 for mating with the hook guide slope 45. A rearwardly extending side stop 44 is provided on the left side of the left member 4, and a rearwardly extending side stop 44 is provided on the right side of the right member 4. When the hook portion 31 is located in the groove portion 41, the two fixing hooks 3 are located between the two side stops 44.

[0024] The present invention has the advantages of high structural strength and high stability during use.

Claims

1. A folding wheelchair, comprising a backrest frame hinged to the rear end of a seat cushion frame, a support frame is foldably connected to the lower side of the seat cushion frame, the support frame includes a front support rod and a rear support rod located on the lower side of the seat cushion frame, the lower end of the front support rod is connected to a front wheel, the lower end of the rear support rod is connected to a rear wheel, the rear support rod gradually extends downward from front to back, and the front end of the rear support rod is hinged to the seat cushion frame or the front support rod, and is characterized in that: An auxiliary rod extending upward is provided at a position where the rear support rod deviates from the rear end. The backrest frame has a vertical rod extending downward. The vertical rod is hinged to the auxiliary rod at a position where the vertical rod deviates from the lower end. A fixing hook is hinged to the lower end of the vertical rod. The rear support rod is provided with a member, and the member forms a groove portion that cooperates with the hook portion of the fixing hook. The fixing hook is equipped with an elastic member. When the hook portion is located in the groove portion, the hook portion abuts against the groove wall of the groove portion under the action of the elastic member, and the vertical rod is adjacent to or in contact with the rear end surface of the member.

2. The folding wheelchair according to claim 1, wherein: The front end of the fixing hook forms the upwardly curved hook portion. The front end surface of the upper end of the hook portion has a hook portion guiding inclined surface. The lower portion of the member forms a mating groove that opens backward and communicates with the groove portion. The groove portion is located in the upper portion of the member. The upper groove wall of the mating groove forms a member guiding inclined surface for cooperating with the hook portion guiding inclined surface.

3. The folding wheelchair according to claim 1, wherein: The middle portion of the fixing hook is hinged to the vertical rod, and the front and rear ends of the fixing hook are respectively provided with a hook portion and a hand-held portion.

4. The folding wheelchair according to claim 1 or 2, characterized in that: A side blocking portion extending backward is provided on the side of the member. When the hook portion is located in the groove portion, the side blocking portion is located outside the fixing hook.

5. The folding wheelchair according to claim 1 or 3, characterized in that: The vertical rods and support rods are provided on both the left and right sides of the seat cushion frame. The fixing hooks at the lower ends of the two vertical rods are connected and fixed by a connecting rod.

6. The folding wheelchair according to claim 1 or 2 or 3, characterized in that: The vertical rod is provided with a hinge groove, and the fixing hook is hinged at the hinge groove. The fixing hook has a limiting protrusion extending upward for contacting the groove wall of the hinge groove.

7. The folding wheelchair according to claim 1 or 2 or 3, characterized in that: The lower end of the auxiliary rod is hinged to the rear support rod, and the hinge joint between the auxiliary rod and the rear support rod is located in front of the member.

8. The folding wheelchair according to claim 1 or 2 or 3, characterized in that: The vertical rod is directly or indirectly hinged to the rear end of the auxiliary frame. The front end of the auxiliary frame is directly or indirectly hinged to the front support rod. A space for placing a battery box and a controller is formed between the auxiliary frame and the seat cushion frame.

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