Folding wheelchair joint locking structure

Abstract

A folding wheelchair joint locking structure comprises a fixing seat, a supporting rod, a limiting rod and an extension spring, the fixing seat is fixed to a rear supporting frame, one end of the supporting rod is hinged to a front supporting frame to form a hinged end, the other end of the supporting rod is in sliding fit with the fixing seat to form a movable end, the limiting rod is installed on the fixing seat, and the extension spring is installed on the limiting rod. One end of the extension spring is hooked to the end of the fixing base, the other end of the extension spring is hooked to the movable end of the supporting rod, a double-locking mechanism is achieved through the fixing base, the supporting rod, the limiting rod and the extension spring, and use safety and driving stability are remarkably improved. During folding, the supporting rods are automatically clamped into the positioning grooves to form self-locking, and accidental unfolding caused by carrying vibration is effectively prevented; during unfolding, the limiting rods and the extension springs cooperate to ensure that the front supporting frame and the rear supporting frame are stably unfolded during driving of the joint parts, the stability is improved, the technical defect of joint locking of an existing wheelchair is overcome, and the user experience is improved.

Description

Technical Field

[0001] This utility model relates to the field of folding wheelchair technology, specifically to a joint locking structure for a folding wheelchair. Background Technology

[0002] Folding wheelchairs are favored by many users, especially those who need to travel frequently or have limited living space, due to their portability and ease of storage. However, existing folding wheelchairs have significant defects in their joint locking structures, which seriously affect the safety and user experience of using the wheelchair. Referring to Chinese invention patent application CN118986648A entitled "A Foldable Wheelchair," the wheelchair in this application uses a four-bar linkage mechanism consisting of a first diagonal support rod, a seat rod, a backrest rod, and a front wheel bracket. When the backrest rod flips forward relative to the seat rod, the four-bar linkage mechanism rotates the rear wheel bracket forward, causing the various rods to fold together above the wheel assembly, thus achieving folding.

[0003] However, when a wheelchair is transported or stored in a folded state, due to the lack of an effective locking mechanism, the joints of the wheelchair may loosen under slight touch, shaking, or normal bumps during transport, causing the wheelchair to unfold on its own. This situation can cause great inconvenience to the user.

[0004] In addition, when users ride in wheelchairs on uneven surfaces, such as bumpy roads, speed bumps, or vibrations from vehicles, the joints of the wheelchair are prone to rotation or wobbling due to external impacts. This instability in the joint structure directly affects the wheelchair's stability and maneuverability, causing discomfort and increasing the risk of falls. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, this utility model provides a folding wheelchair joint locking structure.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] A folding wheelchair joint locking structure, comprising a fixed seat, a support rod, a limiting rod and a tension spring. The fixed seat is fixed on the rear support frame. One end of the support rod is hinged on the front support frame to form a hinged end, and the other end is slidably fitted on the fixed seat to form a movable end. The limiting rod is installed on the fixed seat. One end of the tension spring is hooked on the end of the fixed seat, and the other end is hooked on the movable end of the support rod. A travel chute extending in a direction parallel to the rear support frame is provided on the fixed seat. The movable end of the support rod is fitted in the travel chute. A positioning groove is further provided at the bottom end of the travel chute. When folding the wheelchair, the movable end of the support rod slides down along the travel chute to the positioning groove and is tightened by the tension spring to form self-locking. When unfolding the wheelchair, the movable end of the support rod is led out of the positioning groove and slides to the top end of the travel chute under the action of the tension of the tension spring, so that the front support frame and the rear support frame are kept unfolded. At the same time, the limiting rod abuts against the movable end to form a limit.

[0008] In the present utility model, the fixed seat is of a "C" - shaped structure. The travel chute is arranged on the two side walls of the fixed seat and penetrates through from left to right to form a through - hole. The tension spring is arranged inside the fixed seat.

[0009] Further, the movable end of the support rod is assembled in the travel chute through a sliding shaft. The diameter of the sliding shaft is adapted to the travel chute. After the sliding shaft passes through the travel chutes on the two side walls of the fixed seat, it is connected to both ends of the sliding shaft through the support rod.

[0010] Further, a fixed shaft is further provided at the top end of the fixed seat. Both ends of the tension spring are respectively hooked on the fixed shaft and the sliding shaft.

[0011] In the present utility model, the positioning groove is located at the end of the travel chute to form a hook - shaped structure. A torsion spring is provided between the hinged end of the support rod and the front support frame. The torsion spring drives the support rod to rotate downward around the hinged end to generate a pre - tightening force. When the movable end of the support rod slides to the bottom end of the travel chute, it automatically snaps into the positioning groove.

[0012] In the present utility model, the middle part of the limiting rod is hinged on the fixed seat, and one end extends into the inside of the fixed seat, and the other end warps outwards. A torsion spring is also provided at the hinge joint of the limiting rod and the fixed seat. The torsion spring drives the end of the limiting rod extending into the inside of the fixed seat to abut against the sliding shaft.

[0013] Further, a clamping groove is further provided at the end of the limiting rod extending into the inside of the fixed seat. The limiting rod abuts against the sliding shaft through the clamping groove. A pressing handle is further provided at the end of the limiting rod warping outwards. After pressing the pressing handle, the other end of the limiting rod can be lifted, thereby releasing the locking of the sliding shaft.

[0014] The present utility model has the following advantages and beneficial effects:

[0015] A joint locking structure is installed below the hinge points at the top of the front and rear support frames. This structure employs a dual locking mechanism via a fixed base, support rod, limit rod, and tension spring, significantly improving safety and stability during use. When folded, the support rod automatically engages with the positioning slot, effectively preventing accidental unfolding due to handling vibrations. When unfolded, the limit rod and tension spring work together to ensure stable unfolding of the front and rear support frames during movement, enhancing stability and overcoming the technical shortcomings of existing wheelchair joint locking mechanisms, thus improving the user experience. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0017] Figure 1 This is a schematic diagram of the structure of the folding wheelchair in this embodiment;

[0018] Figure 2 This is a schematic diagram of the installation of the locking structure in this embodiment;

[0019] Figure 3 This is a schematic diagram of the locking structure 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] As shown Figures 1 to 3 in the figure, this embodiment discloses a folding wheelchair joint locking structure. The folding wheelchair includes a front support frame 1 for main body support and a rear support frame 2. The tops of the front support frame 1 and the rear support frame 2 are hinged to each other. The joint locking structure 3 is installed below the hinge point at the tops of the front support frame 1 and the rear support frame 2. The joint locking structure 3 includes a fixed seat 31, a support rod 32, a limiting rod 33 and a tension spring 34. The fixed seat 31 is fixed on the rear support frame 2. One end of the support rod 32 is hinged on the front support frame 1 to form a hinged end, and the other end is slidably fitted on the fixed seat 31 to form a movable end. The limiting rod 33 is installed on the fixed seat 31 to limit the support rod 32 after the wheelchair is unfolded. One end of the tension spring 34 is hooked on the end of the fixed seat 31, and the other end is hooked on the movable end of the support rod 32. Specifically, a travel chute 311 extending along the direction parallel to the rear support frame 2 is provided on the fixed seat 31. The movable end of the support rod 32 is fitted in the travel chute 311. A positioning groove 312 is further provided at the bottom end of the travel chute 311. When folding the wheelchair, the front support frame 1 and the rear support frame 2 approach each other. The movable end of the support rod 32 slides downward along the travel chute 311 to the bottom end and is locked in the positioning groove 312 to form a limit. At the same time, with the tightening effect of the tension spring 34, it is more stable after being locked in the positioning groove 312. When unfolding the wheelchair, the movable end of the support rod 32 is led out from the positioning groove 312. Subsequently, the tension spring 34 drives the movable end of the support rod 32 to slide upward along the travel chute 311 through the pulling force, so that the front support frame 1 and the rear support frame 2 are unfolded. When the movable end of the support rod 32 reaches the top end of the travel chute 311, the wheelchair is completely unfolded. At this time, the limiting rod 33 abuts against the movable end to form a limit, preventing the hinge part of the front support frame 1 and the rear support frame 2 from being impacted and rotated when the wheelchair travels on an uneven road surface.

[0024] In this embodiment, the fixed seat 31 is of a "C" - shaped structure. The travel chute 311 is provided on both side walls of the fixed seat 31 and runs through from left to right to form a through - hole. The tension spring 34 is arranged inside the fixed seat 31.

[0025] Furthermore, in order to improve the smoothness of the sliding of the support rod 32, the movable end of the support rod 32 is assembled in the travel chute 311 through a sliding shaft 313. The diameter of the sliding shaft 313 is adapted to the aperture of the travel chute 311. Specifically, the sliding shaft 313 passes through the travel chute 311 on both side walls of the fixed seat 31 and is then connected to both ends of the sliding shaft 313 through the support rod 32. A fixed shaft 314 is further provided at the top end of the fixed seat 31. Both ends of the tension spring 34 are respectively hooked on the fixed shaft 314 and the sliding shaft 313.

[0026] In this embodiment, the positioning groove 312 is also provided on both sides of the fixed base 31 and forms a hook-shaped structure at the end of the travel groove 311. In addition, in order to facilitate locking after folding, a torsion spring is provided between the hinge end of the support rod 32 and the front support frame 1. The torsion spring drives the support rod 32 to rotate downward around the hinge end to generate a preload. Therefore, when the movable end of the support rod 32 slides at the bottom end of the travel groove 311, it will automatically lock into the positioning groove 312 without manual operation, which is convenient for locking.

[0027] In this embodiment, the middle part of the limiting rod 33 is hinged to the fixed base 31, and one end extends into the inner side of the fixed base 31, while the other end is raised outward. A torsion spring is provided at the hinge point between the limiting rod 33 and the fixed base 31. The torsion spring drives the end of the limiting rod 33 extending into the fixed base 31 to abut against the sliding shaft 313. At the same time, the end of the limiting rod 33 extending into the fixed base 31 is also provided with a groove 331. The limiting rod 33 abuts against the sliding shaft 313 through the groove 331, improving stability. In addition, the outward-raised end of the limiting rod 33 is also provided with a pressing handle 332. Pressing the pressing handle 332 can lift the other end of the limiting rod 33, thereby releasing the locking of the sliding shaft 313.

[0028] 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 folding wheelchair joint locking structure, characterized in that, It includes a fixed seat (31), a support rod (32), a limiting rod (33) and a tension spring (34). The fixed seat (31) is fixed on the rear support frame (2). One end of the support rod (32) is hinged on the front support frame (1) to form a hinged end, and the other end is slidably fitted on the fixed seat (31) to form a movable end. The limiting rod (33) is installed on the fixed seat (31). One end of the tension spring (34) is hooked on the end of the fixed seat (31), and the other end is hooked on the movable end of the support rod (32). A travel chute (311) extending along the direction parallel to the rear support frame (2) is provided on the fixed seat (31). The movable end of the support rod (32) is fitted in the travel chute (311). A positioning groove (312) is further provided at the bottom end of the travel chute (311). When folding the wheelchair, the movable end of the support rod (32) slides down along the travel chute (311) to the positioning groove (312) and is tightened by the tension spring (34) to form self-locking. When unfolding the wheelchair, the movable end of the support rod (32) is led out of the positioning groove (312) and slides to the top end of the travel chute (311) under the action of the tension of the tension spring (34), so that the front support frame (1) and the rear support frame (2) are kept unfolded, and at the same time, the limiting rod (33) abuts against the movable end to form a limit.

2. The folding wheelchair joint locking structure according to claim 1, wherein The fixed seat (31) is of a "C" - shaped structure. The travel chute (311) is provided on the two side walls of the fixed seat (31) and penetrates through left and right to form a through - hole. The tension spring (34) is arranged inside the fixed seat (31).

3. The folding wheelchair joint locking structure according to claim 2, wherein The movable end of the support rod (32) is assembled in the travel chute (311) through a sliding shaft (313). The diameter of the sliding shaft (313) is adapted to the travel chute (311). The sliding shaft (313) passes through the travel chute (311) on the two side walls of the fixed seat (31) and is connected to both ends of the sliding shaft (313) through the support rod (32).

4. The folding wheelchair joint locking structure according to claim 3, wherein A fixed shaft (314) is further provided at the top end of the fixed seat (31). The two ends of the tension spring (34) are respectively hooked on the fixed shaft (314) and the sliding shaft (313).

5. The folding wheelchair joint locking structure according to claim 1, wherein The positioning groove (312) is located at the end of the travel chute (311) to form a hook - shaped structure. A torsion spring is provided between the hinged end of the support rod (32) and the front support frame (1). The torsion spring drives the support rod (32) to rotate downward around the hinged end to generate a pre - tightening force. When the movable end of the support rod (32) slides to the bottom end of the travel chute (311), it automatically snaps into the positioning groove (312).

6. The folding wheelchair joint locking structure according to claim 3, wherein The middle part of the limiting rod (33) is hinged on the fixed seat (31), and one end extends into the inside of the fixed seat (31), and the other end warps outwards. A torsion spring is also provided at the hinged part of the limiting rod (33) and the fixed seat (31). The torsion spring drives the end of the limiting rod (33) extending into the inside of the fixed seat (31) to abut against the sliding shaft (313).

7. The folding wheelchair joint locking structure according to claim 6, wherein The end of the limiting rod (33) that extends into the inner side of the fixed seat (31) is also provided with a slot (331). The limiting rod (33) abuts against the sliding shaft (313) through the slot (331). The end of the limiting rod (33) that is raised outward is also provided with a pressing handle (332). After pressing the pressing handle (332), the other end of the limiting rod (33) can be lifted, thereby releasing the locking of the sliding shaft (313).

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