Folding wheelchair

Abstract

The utility model discloses a folding wheelchair which comprises a fixed frame, a first movable frame, a second movable frame and a locking device, the first movable frame and the second movable frame are movably arranged on the fixed frame, and the wheelchair can be switched between a first unfolded state and a second folded state by moving the first movable frame and the second movable frame. The locking device comprises a lock hook structure and a lock column structure, the lock hook structure comprises a connecting frame, a lock hook and a torsional spring, the connecting frame is fixedly connected with the first movable frame, the lock hook is rotatably connected with the connecting frame, the torsional spring is arranged between the lock hook and the connecting frame, a lock groove is formed in the lock hook, and the lock column structure comprises a fixed frame and a lock column. The fixed frame is fixedly connected with the second movable frame, the lock column is fixedly connected with the fixed frame, and the lock hook can be hooked on the lock column through the lock groove in the first state. According to the folding wheelchair, the lock hook of the locking device is hooked on the lock column under the action of the torsion spring, hooking stability is high, the structure is simple, and operation is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of wheelchairs, and particularly to a folding wheelchair. Background Art

[0002] A wheelchair is a chair equipped with wheels to help replace walking, and is an important mobile tool for the wounded, sick, and disabled for home rehabilitation, turnover transportation, medical treatment, and outdoor activities. In order to facilitate carrying and transportation and improve the portability of the wheelchair, folding wheelchairs have emerged. They can be switched between the unfolded state and the folded state according to the needs of users. When in the unfolded state, they can be used by users to move, and when in the folded state, the volume is reduced, making it convenient for carrying and transportation. Since the state of the folding wheelchair can be changed, a locking device must be equipped on the folding wheelchair to lock the wheelchair in the unfolded state and prevent the wheelchair from folding and deforming during use. The existing locking devices are either complex in structure and inconvenient to assemble, or inconvenient to operate, greatly reducing the user experience. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is that in the prior art, the locking devices on folding wheels are complex in structure and mostly inconvenient to operate. Based on this, the utility model provides a folding wheelchair with a relatively simple and easy-to-operate locking device.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a folding wheelchair, including a fixed frame, a first movable frame and a second movable frame movably arranged on the fixed frame, and a locking device. Moving the first movable frame and the second movable frame can switch the wheelchair between the first unfolded state and the second folded state. The locking device includes a hook structure and a lock post structure. The hook structure includes a connecting frame, a hook and a torsion spring. The connecting frame is fixedly connected to the first movable frame. The hook is rotatably connected to the connecting frame. The torsion spring is arranged between the hook and the connecting frame. A lock groove is provided on the hook. The lock post structure includes a fixed frame and a lock post. The fixed frame is fixedly connected to the second movable frame. The lock post is fixedly connected to the fixed frame. The hook can be hooked on the lock post through the lock groove in the first state.

[0005] Further, a fixed pin shaft is fixedly connected to the connecting frame. One end of the hook is rotatably sleeved on the fixed pin shaft. The torsion spring is sleeved on the fixed pin shaft. One end of the torsion spring is fixedly connected to the hook. The other end of the torsion spring is fixedly connected to the connecting frame.

[0006] Further, the hook has a plate-like structure. A weight-reducing groove is provided on the hook. The lock groove is open and located on a side wall of the hook.

[0007] Further, a connecting post is fixedly connected to the surface of the locking hook opposite to the locking groove, and an operating plate is fixedly connected to one end of the connecting post away from the locking hook.

[0008] Further, the fixed frame includes two oppositely arranged arc-shaped brackets and a connecting plate connected to one end of the arc-shaped brackets. The folding wheelchair further includes a rear wheel, and the rear wheel is rotatably installed on the connecting plate.

[0009] Further, the first movable frame includes a backrest frame, a seat frame, a connecting piece, and a backrest connecting pipe. One end of the backrest frame can abut against the arc-shaped bracket. One end of the seat frame is hinged to one end of the arc-shaped bracket. The other end of the seat frame is connected to the backrest through the connecting piece. One end of the connecting piece is hinged to the seat frame, and the other end of the connecting piece is hinged to the backrest. The backrest connecting pipe is fixedly connected to the backrest frame, and the connecting frame is fixedly connected to the backrest connecting pipe.

[0010] Further, a latching block is fixedly connected to the lower end of the backrest frame, and a groove cooperating with the arc-shaped bracket is formed in the latching block.

[0011] Further, the second movable frame includes a rear connecting rod and a rear connecting rod connecting pipe. One end of the rear connecting rod is hinged to the connecting plate, and the other end of the rear connecting rod is hinged to the end of the backrest frame. The rear connecting rod connecting pipe is fixedly connected to the rear connecting rod, and the fixed frame is fixedly connected to the rear connecting rod connecting pipe.

[0012] Further, the folding wheelchair further includes a front bracket, a front wheel, and a linkage rod. One end of the front bracket is hinged to the arc-shaped bracket. The front wheel is rotatably installed at the lower end of the front bracket. A front bracket connecting pipe is fixedly connected to the front bracket. One end of the linkage rod is hinged to the backrest connecting pipe, and the other end of the linkage rod is hinged to the front bracket connecting pipe.

[0013] Further, a U-shaped pipe is fixedly connected to the front bracket connecting pipe. A connecting block is fixedly connected to the U-shaped pipe. A footrest connecting rod is rotatably installed on the connecting block. A footrest plate is fixedly installed on the footrest connecting rod. A limiting post is further installed on the footrest connecting rod, and the limiting post can abut against the connecting block.

[0014] The beneficial effects of the present utility model are as follows: For the folding wheelchair of the present utility model, when a user applies an external force to the locking hook to overcome the elastic force of the torsion spring and rotate the locking hook, the locking groove part of the locking hook is located below the locking post. When the wheelchair is in the first state, the external force on the locking hook is released, and the torsion spring resets. The locking hook automatically rotates under the action of the torsion spring, so that the locking hook is hooked on the locking post, thereby realizing the locking function of the wheelchair. The structure is simple and the operation is convenient. Brief Description of the Drawings

[0015] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0016] Figure 1 is a perspective view of the folding wheelchair of the present utility model (in the first state);

[0017] Figure 2 is Figure 1 a partial enlarged view of part A in the folding wheelchair shown;

[0018] Figure 3 is Figure 2 a perspective view of the lock hook structure in the locking device shown;

[0019] Figure 4 is Figure 1 a perspective view of another angle of the folding wheelchair shown;

[0020] Figure 5 is Figure 1 a perspective view of another state of the folding wheelchair shown (in the second state);

[0021] Figure 6 is Figure 5 a perspective view of another angle of the folding wheelchair shown.

[0022] In the figure: 1. Fixed frame, 11. Arc bracket, 12. Connecting plate, 13. Reinforcing rod, 2. First movable frame, 21. Backrest, 211. Latching block, 2111. Groove, 22. Seat frame, 23. Connecting piece, 24. Backrest connecting pipe, 3. Second movable frame, 31. Rear connecting rod, 32. Rear connecting rod connecting pipe, 4. Locking device, 41. Lock hook structure, 411. Connecting frame, 410. Lock groove, 4111. Fixed pin shaft, 412. Lock hook, 4121. Weight reduction groove, 413. Connecting column, 414. Operating plate, 42. Lock post structure, 421. Fixed frame, 420. Lock post, 5. Rear wheel, 51. Motor, 6. Front bracket, 61. Front bracket connecting pipe, 7. Front wheel, 8. Linkage rod, 81. Battery, 9. U-shaped pipe, 91. Connecting block, 92. Pedal connecting rod, 93. Pedal, 94. Limit post. Detailed Description of the Preferred Embodiments

[0023] The present utility model will now be described in detail with reference to the drawings. This figure is a simplified schematic diagram, which only illustrates the basic structure of the present utility model in a schematic manner, so it only shows the components related to the present utility model.

[0024] Please refer to Figures 1-6, the present utility model provides a folding wheelchair, which includes a fixed frame 1, a first movable frame 2, a second movable frame 3 and a locking device 4. The first movable frame 2 and the second movable frame 3 are both movably installed on the fixed frame 1. Moving the first movable frame 2 and the second movable frame 3 can switch the folding wheelchair between a first unfolded state and a second folded state. The locking device 4 is disposed between the first movable frame 2 and the second movable frame 3, and the locking device 4 is used to lock the first movable frame 2 and the second movable frame 3 when the folding wheelchair is in the first state. When the locking device 4 is unlocked, the folding wheelchair can be switched from the first state to the second state.

[0025] Please refer to Figure 2 , Figure 3 , the locking device 4 includes a lock hook structure 41 and a lock post structure 42. The lock hook structure 41 includes a connecting frame 411, a lock hook 412 and a torsion spring (not shown in the figure). The lock hook structure 41 is fixedly connected to the first movable frame 2. One end of the lock hook 412 is rotatably connected to the connecting frame 411. The torsion spring is installed between the lock hook 412 and the connecting frame 411. A lock groove 410 is provided at the end of the lock hook 412 away from the connecting frame 411. The lock post structure 42 includes a fixed frame 421 and a lock post 420. The fixed frame 421 is fixedly connected to the second movable frame 3, and the lock post 420 is fixedly connected to the fixed frame 421. The lock hook 412 can be hooked on the lock post 420 through the lock groove 410 in the first state.

[0026] When the folding wheelchair of the present utility model needs to be used, the user first adjusts the wheelchair to the first state by moving the first movable frame 2 and the second movable frame 3, and then hooks the lock hook 412 on the lock post 420, thereby locking the first movable frame 2 and the second movable frame 3. In the above process, the user applies an external force to the lock hook 412 to rotate the lock hook 412 against the elastic force of the torsion spring, so that the lock groove 410 part of the lock hook 412 is located below the lock post 420. When the wheelchair is in the first state, the external force on the lock hook 412 is released, and the torsion spring resets. The lock hook 412 automatically rotates under the action of the torsion spring, so that the lock hook 412 is hooked on the lock post 420, thereby realizing the locking function of the wheelchair. The structure is simple and the operation is convenient.

[0027] When the user wants to fold the wheelchair, just rotate the lock hook 412 against the elastic force of the torsion spring to disengage the lock groove 410 from the lock 420, and then the first movable frame 2 and the second movable frame 3 can be further moved to adjust the wheelchair to the folded state for easy transportation and carrying.

[0028] As a preferred embodiment, the connection frame 411 is generally in a U-shaped structure, a fixed pin 4111 is fixedly connected between two opposite side walls of the connection frame 411, one end of the lock hook 412 is rotatably sleeved on the fixed pin 4111, the torsion spring is sleeved on the fixed pin 4111, one end of the torsion spring is fixedly connected to the lock hook 412, and the other end of the torsion spring is fixedly connected to the connection frame 411. When the torsion spring is in a natural state, the lock hook 412 is always hooked on the lock column 420 under the elastic force of the torsion spring, thereby ensuring that the lock hook 412 will not be easily separated from the lock column 420.

[0029] The lock hook 412 is generally in a plate-like structure, and a weight-reducing groove 4121 is provided on the lock hook 412. The lock groove 410 is opened and located on a side wall of the lock hook 412. The plate-like lock hook 412 ensures the structural strength of the lock hook 412, making it difficult to deform. Under the premise of ensuring the structural strength, the weight-reducing groove 4121 is provided to reduce the weight of the lock hook 412, which is conducive to lightweight production.

[0030] Furthermore, a connecting column 413 is fixedly connected to the surface of the lock hook 412 opposite to the lock slot 410, and an operating plate 414 is fixedly connected to the end of the connecting column 413 away from the lock hook 412. The operating plate 414 is a rectangular plate structure. When in use, the user can bend the operating plate 414 to rotate the lock hook 412, so that the lock hook 412 is separated from the lock column 420.

[0031] Please refer again Figure 1 The fixed frame 1 includes two arc-shaped brackets 11 arranged opposite to each other and a connecting plate 12 connected to one end of the arc-shaped bracket 11. The folding wheelchair of the utility model also includes a rear wheel 5, which is rotatably mounted on the connecting plate 12. In order to improve the strength of the arc-shaped bracket 11, a reinforcing rod 13 is fixedly connected between the two arc-shaped brackets 11. There are two reinforcing rods 13, which are respectively located at the two ends of the arc-shaped bracket 11.

[0032] In this embodiment, the first movable frame 2 includes a back frame 21, a seat frame 22, a connecting piece 23 and a back frame connecting pipe 24, wherein one end of the back frame 21 can be placed on the arc-shaped bracket 11, one end of the seat frame 22 is hinged to one end of the arc-shaped bracket 11, the other end of the seat frame 22 is connected to the back frame 21 through the connecting piece 23, the seat frame 22 is used to install a seat cushion, wherein one end of the connecting piece 23 is hinged to the seat frame 22, the other end of the connecting piece 23 is hinged to the back frame 21, the back frame connecting pipe 24 is fixedly connected to the back frame 21, and the connecting frame 411 is fixedly connected to the back frame connecting pipe 24. When in use, the end of the back frame 21 can be placed on the arc-shaped bracket 11 or separated from the arc-shaped bracket 11. When the back frame 21 is placed on the arc-shaped bracket 11, the folding wheelchair is in the first state, and when the back frame 21 is separated from the arc-shaped bracket 11, the folding wheelchair can be adjusted to the second state.

[0033] Please refer to Figure 5 , as a preferred embodiment, a latch block 211 is fixedly connected to the lower end of the backrest frame 21. A groove 2111 that mates with the arc-shaped bracket 11 is formed in the latch block 211. The groove 2111 can fit with the surface of the arc-shaped bracket 11, so that the backrest frame 21 is stably lapped on the arc-shaped bracket 11.

[0034] The second movable vehicle frame 3 includes a rear connecting rod 31 and a rear connecting rod connecting pipe 32. One end of the rear connecting rod 31 is hinged to the connecting plate 12, and the other end of the rear connecting rod 31 is hinged to the end of the backrest frame 21. The rear connecting rod connecting pipe 32 is fixedly connected to the rear connecting rod 31, and the fixed frame 421 is fixedly connected to the rear connecting rod connecting pipe 32. When one end of the backrest frame 21 is moved to abut against the arc-shaped bracket 11, the rear connecting rod 31 is forced to rotate under the drive of the backrest frame 21, so that the locking post structure 42 on the rear connecting rod connecting pipe 32 moves near the locking hook structure 41. Here, the user can operate the locking device 4 to lock the wheelchair in the opened first state. In the unlocked state, the user can separate the lower end of the backrest frame 21 from the arc-shaped bracket 11, and then rotate the backrest frame 21 backward, so that the wheelchair can be folded up for easy carrying.

[0035] Please refer to again Figure 4 , the folding wheelchair of the present invention further includes a front bracket 6, a front wheel 7 and a linkage rod 8. One end of the front bracket 6 is hinged to the arc-shaped bracket 11, the front wheel 7 is rotatably installed at the lower end of the front bracket 6, a front bracket connecting pipe 61 is fixedly connected to the front bracket 6, one end of the linkage rod 8 is hinged to the backrest frame connecting pipe 24, and the other end of the linkage rod 8 is hinged to the front bracket connecting pipe 61. During the folding operation, the user rotates the backrest frame 21 backward, and under the drive of the linkage rod 8, the front bracket connecting pipe 61 together with the front bracket 6 can be driven to move toward the direction close to the arc-shaped bracket 11. Thus, while folding up the backrest frame 21, the front bracket 6 and the front wheel 7 are also folded and retracted. The same operation can simultaneously realize the folding and storage functions of the front and rear structures of the wheelchair, and the operation is simple and convenient.

[0036] In addition, a motor 51 for driving the rear wheel 5 to rotate is installed on the connecting plate 12. A battery 81 is fixedly installed on the linkage rod 8, and the battery 81 is electrically connected to the motor 51. During use, the battery 81 supplies power to the motor 51 to drive the rear wheel 5 to rotate, so that the wheelchair moves. The motor 51 is a forward and reverse motor to realize the forward and backward movement functions of the wheelchair.

[0037] As a preferred embodiment, a U-shaped tube 9 is fixedly connected to the front support connecting tube 61. A connecting block 91 is fixedly connected to the U-shaped tube 9. A foot pedal connecting rod 92 is rotatably mounted on the connecting block 91. A foot pedal 93 is fixedly mounted on the foot pedal connecting rod 92. A limiting post 94 is further mounted on the foot pedal connecting rod 92. The limiting post 94 can abut against the connecting block 91. During normal use, the foot pedal 93 is in an open state for the user to place their feet. The limiting post 94 abuts against the upper surface of the connecting block 91, thereby restricting the downward rotation of the foot pedal connecting rod 92. When the wheelchair is folded up, the foot pedal connecting rod 92 can be rotated upward, thereby retracting the foot pedal 93, and further reducing the size of the wheelchair, which is more conducive to transporting and carrying the wheelchair.

[0038] Inspired by the above ideal embodiment based on the present invention, through the above description, relevant staff can make various changes and modifications without departing from the scope of the present invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A folding wheelchair, comprising a fixed frame, a first movable frame and a second movable frame movably arranged on the fixed frame, and a locking device, wherein the first movable frame and the second movable frame can be moved to switch the wheelchair between a first unfolded state and a second folded state, characterized in that: The locking device includes a lock hook structure and a lock column structure, the lock hook structure includes a connecting frame, a lock hook and a torsion spring, the connecting frame is fixedly connected to the first movable frame, the lock hook is rotatably connected to the connecting frame, the torsion spring is arranged between the lock hook and the connecting frame, the lock hook is provided with a lock groove, the lock column structure includes a fixed frame and a lock column, the fixed frame is fixedly connected to the second movable frame, the lock column is fixedly connected to the fixed frame, and the lock hook can be hooked on the lock column through the lock groove in the first state.

2. The folding wheelchair according to claim 1, characterized in that: A fixed pin is fixedly connected to the connecting frame, one end of the lock hook is rotatably sleeved on the fixed pin, the torsion spring is sleeved on the fixed pin, one end of the torsion spring is fixedly connected to the lock hook, and the other end of the torsion spring is fixedly connected to the connecting frame.

3. The folding wheelchair according to claim 2, characterized in that: The lock hook is in a plate-like structure, a weight-reducing groove is provided on the lock hook, and the lock groove opening is arranged and located on a side wall of the lock hook.

4. The folding wheelchair according to claim 2, characterized in that: A connecting column is fixedly connected on the surface of the lock hook opposite to the lock slot, and an operating plate is fixedly connected on one end of the connecting column away from the lock hook.

5. The folding wheelchair according to claim 1, characterized in that: The fixed frame comprises two arc-shaped brackets arranged opposite to each other and a connecting plate connected to one end of the arc-shaped brackets. The folding wheelchair also comprises rear wheels which are rotatably mounted on the connecting plate.

6. The folding wheelchair according to claim 5, characterized in that: The first movable frame includes a back frame, a seat frame, a connecting plate and a back frame connecting tube, one end of the back frame can be placed on the arc-shaped bracket, one end of the seat frame is hinged to one end of the arc-shaped bracket, the other end of the seat frame is connected to the back frame through the connecting plate, one end of the connecting plate is hinged to the seat frame, the other end of the connecting plate is hinged to the back frame, the back frame connecting tube is fixedly connected to the back frame, and the connecting frame is fixedly connected to the back frame connecting tube.

7. The folding wheelchair according to claim 6, characterized in that: A step block is fixedly connected to the lower end of the back frame, and a groove matching with the arc-shaped bracket is formed on the step block.

8. The foldable wheelchair according to claim 6, characterized in that: The second movable frame includes a rear link and a rear link connecting tube, one end of the rear link is hinged to the connecting plate, the other end of the rear link is hinged to the end of the back frame, the rear link connecting tube is fixedly connected to the rear link, and the fixing frame is fixedly connected to the rear link connecting tube.

9. The folding wheelchair according to claim 6, characterized in that: The folding wheelchair also includes a front bracket, a front wheel and a linkage rod, one end of the front bracket is hinged to the arc bracket, the front wheel is rotatably mounted at the lower end of the front bracket, a front bracket connecting tube is fixedly connected to the front bracket, one end of the linkage rod is hinged to the back frame connecting tube, and the other end of the linkage rod is hinged to the front bracket connecting tube.

10. The folding wheelchair according to claim 9, characterized in that: A U-shaped tube is fixedly connected to the front bracket connecting tube, a connecting block is fixedly connected to the U-shaped tube, a pedal connecting rod is rotatably mounted on the connecting block, a pedal is fixedly mounted on the pedal connecting rod, a limiting column is also mounted on the pedal connecting rod, and the limiting column can be abutted against the connecting block.

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