Folding wheelchair

Abstract

A folding wheelchair (100), comprising a front bracket (1), a rear bracket (2), a seat plate (3), a first driving device (4), a second driving device (5), a first driving member (6) and a second driving member (7), wherein the front bracket (1) is pivotally connected relative to the rear bracket (2); the seat plate (3) is pivotally connected relative to the rear bracket (2); one end of the first driving device (4) is pivotally connected to the rear bracket (2); an output end of the first driving device (4) is movably arranged at and pivotally connected to one end of the first driving member (6); the other end of the first driving member (6) is pivotally connected to the seat plate (3) so as to drive the seat plate (3) to move closer to the rear bracket (2); one end of the second driving device (5) is pivotally connected to the rear bracket (2); an output end of the second driving device (5) is telescopically arranged at and pivotally connected to one end of the second driving member (7); and the other end of the second driving member (7) is fixedly connected to the front bracket (1) so as to drive the front bracket (1) to move closer to the rear bracket (2). The folding wheelchair has the advantages of a simple structure and convenient use.

Description

Folding wheelchair TECHNICAL FIELD

[0001] The present application relates to a wheelchair, in particular to a folding wheelchair. BACKGROUND

[0002] The volume of a wheelchair is generally large, and it is usually folded to reduce the volume for storage. However, in order to reduce the cost, the existing folding wheelchair usually uses only one driving device to drive the folding of the whole vehicle, so that more linkage mechanisms are needed to connect the front wheel support, the rear wheel support, the armrest and the backrest, etc., so that the structure of the whole vehicle is very complex.

[0003] SUMMARY

[0004] The present application aims to provide a folding wheelchair with simple structure and convenient use.

[0005] Another object of the present application is to provide a folding wheelchair with simple structure and convenient use.

[0006] A third object of the present application is to provide a folding wheelchair with simple structure and convenient use.

[0007] In order to achieve the above-mentioned objects, the folding wheelchair provided by the present application comprises a front support, a rear support, a seat plate, a first driving device, a second driving device, a first driving member and a second driving member, the front support is pivotally connected to the rear support; the seat plate is pivotally connected to the rear support; one end of the first driving device is pivotally connected to the rear support; the output end of the first driving device is movably arranged and pivotally connected to one end of the first driving member; the other end of the first driving member is pivotally connected to the seat plate to drive the seat plate to move closer to the rear support; one end of the second driving device is pivotally connected to the rear support; the output end of the second driving device is telescopically arranged and pivotally connected to one end of the second driving member, and the other end of the second driving member is fixedly connected to the front support to drive the front support to move closer to the rear support.

[0008] Compared with the prior art, the folding wheelchair is provided with a front support and a rear support, the seat is pivoted to the rear support, the first driving member is connected between the seat plate and the first driving device, the second driving member is connected between the front support and the rear support, and the first driving device and the second driving device are used to drive the seat plate and the front support to move towards the rear support respectively. Therefore, the seat plate and the front support of the folding wheelchair are driven by two driving devices respectively, so that the linkage rod or the connecting rod as the intermediate linkage mechanism can be greatly reduced, the structure of the folding wheelchair is greatly simplified, the structure of the folding wheelchair is very simple, and the folding wheelchair can be automatically folded by controlling the two driving devices respectively, and the folding wheelchair is very simple and convenient to use.

[0009] Preferably, the pivoting shafts of the seat plate and the rear support and the pivoting shafts of the front support and the rear support are coaxially arranged. In this way, the structure of the folding wheelchair can be further simplified.

[0010] Preferably, the front end of the seat plate is provided with a seat body, and the seat body is pivoted to the rear support.

[0011] Preferably, the rear support is provided with a sliding groove, the output end of the first driving device is provided with a sliding block, the sliding block is movably arranged in the sliding groove, and one end of the first driving member is pivoted to the sliding block. By using the sliding groove and the sliding block, the output end of the first driving device and the support of the first driving member can be more stable and reliable, so that the seat plate can be stably supported, and the safety of riding can be improved.

[0012] Preferably, the folding wheelchair further comprises a handrail mechanism, and the handrail mechanism is pivoted to the rear support.

[0013] Specifically, the handrail mechanism comprises a first connecting rod, a second connecting rod and a handrail, the lower end of the first connecting rod is pivoted to the rear support, the upper end of the first connecting rod is pivoted to the handrail, the lower end of the second connecting rod is pivoted to the rear support, and the upper end of the second connecting rod is pivoted to the handrail. The first connecting rod, the second connecting rod, the handrail and the rear support form a deformable quadrilateral structure.

[0014] Specifically, the handrail mechanism further comprises a locking pin, the locking pin is movably arranged between the handrail and one of the first connecting rod and the second connecting rod, and the deformable quadrilateral structure is locked or released.

[0015] Specifically, one side of the handrail is pivotally connected with an operation handle, the locking pin is arranged on the operation handle, and the operation handle is turned up and down to drive the locking pin to be inserted into or separated from the insertion hole of one of the first connecting rod and the second connecting rod, so that the locking or unlocking of the deformable quadrilateral structure is realized.

[0016] Specifically, the extension direction of the pivot shaft of the operation handle is along the front-rear direction of the handrail, one side of the operation handle is provided with a sliding groove, the direction of the sliding groove is along the up-down direction of the handrail, and one end of the locking pin is slidably arranged in the sliding groove.

[0017] Specifically, the sliding groove is a T-shaped groove, and the end of the locking pin is a T-shaped head matched with the T-shaped groove; and the depth of the T-shaped groove is greater than the thickness of the T-shaped head.

[0018] Specifically, a limiting groove is arranged on the outer side of one end of the locking pin close to the T-shaped head, and the opening edge of the T-shaped groove is clamped in the limiting groove; and the width of the limiting groove is greater than the thickness of the opening edge of the T-shaped groove.

[0019] Specifically, the handrail is provided with a guide hole, the diameters of the two ends of the guide hole are smaller than the inner diameter of the middle hole, and the locking pin is slidably arranged in the guide hole.

[0020] Specifically, the handrail structure further comprises an elastic reset member arranged between the locking pin and the handrail.

[0021] Preferably, the second driving member comprises a horizontal rod and a connecting seat arranged at the two ends of the horizontal rod, the connecting seat is provided with a connecting flange, and the connecting flange is fixedly connected with the front support on the side.

[0022] Preferably, the folding wheelchair further comprises a pedal, one end of the pedal is pivotally connected with the lower end of the front support, a linkage rod is pivotally arranged between the other end of the pedal and the rear support, and a variable parallelogram structure is formed between the front support, the rear support, the pedal and the linkage rod. By arranging the linkage rod and the pedal, the pedal can be opened or folded along with the front support and the rear support, and the convenience of use is improved.

[0023] A folding wheelchair comprises a front support, a rear support, a seat plate, a first driving device and a first driving member, the front support is connected with the rear support, the seat plate is pivotally connected relative to the rear support, one end of the first driving device is pivotally connected with the rear support, the output end of the first driving device is movably arranged and pivotally connected with one end of the first driving member, and the other end of the first driving member is pivotally connected with the seat plate to drive the seat plate to move close to the rear support.

[0024] The folding wheelchair comprises a front support, a rear support, a second driving device and a second driving member, the front support is pivotally connected with the rear support, one end of the second driving device is pivotally connected with the rear support, the output end of the second driving device is telescopically arranged and pivotally connected with one end of the second driving member, the other end of the second driving member is fixedly connected with the front support, so as to drive the front support to move towards the rear support. BRIEF DESCRIPTION OF DRAWINGS

[0025] Fig. 1 is a structure diagram of the folding wheelchair in the unfolded state according to the first embodiment of the present application.

[0026] Fig. 2 is a structure diagram of the second driving member of the folding wheelchair according to the first embodiment of the present application.

[0027] Fig. 3 is a movement state diagram of each rod member when the folding wheelchair according to the first embodiment of the present application is folded.

[0028] Fig. 4 is a structure diagram of the folding wheelchair according to the first embodiment of the present application.

[0029] Fig. 5 is an internal structure diagram of the folding wheelchair according to the first embodiment of the present application.

[0030] Fig. 6 is an exploded view of the folding wheelchair according to the first embodiment of the present application.

[0031] Fig. 7 is a sectional view along the direction of A-A in Fig. 4.

[0032] Fig. 8 is a state diagram of the folding wheelchair according to the first embodiment of the present application when the lock is released.

[0033] Fig. 9 is a state diagram of the folding wheelchair according to the first embodiment of the present application when it is folded.

[0034] Fig. 10 is a structure diagram of the folding wheelchair in the unfolded state according to the second embodiment of the present application.

[0035] Fig. 11 is a structure diagram of the folding wheelchair in the unfolded state according to the third embodiment of the present application. DETAILED DESCRIPTION

[0036] To make the technical content, structural features and achieved effects of the present application clear, the following will be described in detail in combination with the embodiments and the accompanying drawings.

[0037] As shown in Fig. 1, the folding wheelchair 100 of the present application comprises a front support 1, a rear support 2, a seat plate 3, a first driving device 4, a second driving device 5, a first driving member 6 and a second driving member 7. The front support 1 is pivotally connected to the rear support 2 to form a herringbone structure. The lower end of the front support 1 is provided with a front wheel 101, and the lower end of the rear support 2 is provided with a rear wheel 102 on each side. In the present embodiment, the number of front supports 1 is two, and the number of rear supports 2 is one. The two front supports 1 are respectively pivotally connected to the front end of the rear support 2 on both sides. The height of the end of the rear support 2 pivotally connected to the front support 1 is greater than the height of the other end of the rear support 2. The seat plate 3 is pivotally connected to the rear support 2. Specifically, the front end of the seat plate 3 has a seat body 31 on the lower side, and the seat body 31 is pivotally connected to the rear support 2. One end of the first driving device 4 is pivotally connected to the rear support 2. The output end of the first driving device 4 is movably arranged and pivotally connected to one end of the first driving member 6. The first driving device 4 is an electric push rod. The other end of the first driving member 6 is pivotally connected to the bottom of the seat plate 3 to drive the seat plate 3 to move closer to the rear support 2. The first driving member 6 is a rod member. In order to improve the comfort of riding, the first driving member 6 can be replaced by a spring shock absorber in the present embodiment, which also achieves the same effect. One end of the second driving device 5 is pivotally connected to the rear support 2. The output end of the second driving device 5 is telescopically arranged and pivotally connected to one end of the second driving member 7. The second driving device 5 is an electric push rod. The second driving member 7 is a rod member, and the other end of the second driving member 7 is fixedly connected to the front support 1 to drive the front support 1 to move closer to the rear support 2.

[0038] As shown in Fig. 2, the pivot shaft 1a pivotally connecting the seat plate 3 to the rear support 2 and the pivot shaft pivotally connecting the front support 1 to the rear support 2 are coaxially arranged. This can further simplify the structure of the folding wheelchair 100. The second driving member 7 comprises a cross rod 71 and a connecting seat 72 arranged in a bent manner at both ends of the cross rod 71. The connecting seat 72 is provided with a connecting flange 72a, and the connecting flange 72a is fixedly connected to the front support 1 on the same side. The cross rod 71 extends a pivot lug 73 therefrom, and the output end of the second driving device 5 is pivotally connected to the pivot lug 73 of the cross rod 71. The connecting seat 72 is also provided with a sleeve 74, and the pivot shaft 1a freely passes through the sleeve 74. By arranging the cross rod 71 and the connecting seat 72, two connecting seats 72 and two front supports 1 are simultaneously driven by the cross rod 71, so that only one second driving device 5 is needed to synchronously fold or unfold the two front supports 1, which is more convenient to use.

[0039] Referring to Fig. 1 again, the rear support 2 is provided with a sliding groove 21, and the output end of the first driving device 4 is provided with a sliding block 41, which is movably arranged in the sliding groove 21, and one end of the first driving member 6 is pivotally connected to the sliding block 41. By using the sliding groove 21 and the sliding block 41, the output end of the first driving device 4 and the support of the first driving member 6 are more stable and reliable, so that the seat plate 3 can be stably and firmly supported, and the safety of riding is improved.

[0040] Referring to Figs. 1 and 3 again, the folding wheelchair 100 further comprises a handrail structure 8, which is pivotally connected to the rear support 2. Specifically, the handrail structure 8 comprises a first connecting rod 81, a second connecting rod 82 and a handrail 83, the lower end of the first connecting rod 81 is pivotally connected to the rear support 2, the upper end of the first connecting rod 81 is pivotally connected to the handrail 83, the lower end of the second connecting rod 82 is pivotally connected to the rear support 2, the upper end of the second connecting rod 82 is pivotally connected to the handrail 83, and the first connecting rod 81, the second connecting rod 82, the handrail 83 and the rear support 2 form a deformable quadrilateral structure. The handrail structure 8 further comprises a locking pin 84, which is movably arranged between the handrail 83 and one of the first connecting rod 81 and the second connecting rod 82, so as to lock or release the deformable quadrilateral structure. One side of the handrail 83 is pivotally connected with an operation handle 85, and the locking pin 84 is arranged on the operation handle 85, so that when the operation handle 85 is turned, the locking pin 84 can be inserted into or withdrawn from the insertion hole of one of the first connecting rod 81 and the second connecting rod 82, so as to realize the locking or releasing of the deformable quadrilateral structure. In the embodiment, the insertion hole 811 is formed in the first connecting rod 81.

[0041] Please refer to FIG. 4 to FIG. 7, the pivot shaft 85a of the operating handle 85 extends along the front-to-back direction of the handrail 83, so that the operating handle 85 can be flipped up and down, thereby facilitating manual operation by the user. The inner side of the operating handle 85 is provided with a sliding groove 851, which extends along the up-to-down direction of the handrail 83, and one end of the locking pin 84 is slidingly arranged in the sliding groove 851. The lower end of the sliding groove 851 is closed, and the upper end is open, so as to facilitate the installation of the locking pin 84. In this way, when the operating handle 85 is flipped to drive the locking pin 84, the locking pin 84 can slide out of the insertion hole 811, thereby ensuring the stable operation of locking and unlocking. The sliding groove 851 is a T-shaped groove, and the end of the locking pin 84 is a T-shaped head 841 matched with the T-shaped groove. The depth of the T-shaped groove is greater than the thickness of the T-shaped head 841. Since the angle of the locking pin 84 relative to the operating handle 85 changes when the operating handle 85 is flipped, the T-shaped head 841 will swing in the T-shaped groove. Therefore, by making the depth of the T-shaped groove greater than the thickness of the T-shaped head 841, sufficient space is left for the T-shaped groove to swing the T-shaped head 841, thereby preventing the two from interfering and being stuck. The outer side of the end of the locking pin 84 close to the T-shaped head 841 is provided with a limiting groove 842, and the opening edge of the T-shaped groove is clamped in the limiting groove 842. The limiting groove 842 can limit the length of the locking pin 84 extending out of the operating handle 85, thereby preventing the locking pin 84 from being excessively retracted into the T-shaped groove. The width of the limiting groove 842 is greater than the thickness of the opening edge of the T-shaped groove. In this way, sufficient space is left for the locking pin 84 to swing relative to the operating handle 85, thereby preventing the two from interfering and being stuck. The handrail 83 is provided with a guide hole 831, the diameters of the two ends of the guide hole 831 are smaller than the inner diameter of the middle hole, the locking pin 84 slidingly passes through the guide hole 831, the outer side of the locking pin 84 is provided with a limiting flange 843 with a diameter greater than the opening of the guide hole 831 and smaller than the middle hole, and the limiting flange 843 is arranged in the middle hole of the guide hole 831. The handrail mechanism 8 further comprises a resilient reset member 86 arranged between the locking pin 84 and the handrail 83. Specifically, the resilient reset member 86 is a compression spring, which is arranged in the guide hole 831, and one end of the compression spring abuts against the limiting flange 843, and the other end abuts against the wall of the guide hole 831, so as to provide an elastic force for inserting the locking pin 84 into the insertion hole 811.

[0042] The folding wheelchair 100 further comprises a pedal 9, one end of which is pivotally connected to the lower end of the front support 1, and the other end of which is pivotally connected to the rear support 2 through a linkage rod 10, and the front support 1, the rear support 2, the pedal 9 and the linkage rod 10 form a variable parallelogram structure. By arranging the linkage rod 10 and the pedal 9, the pedal 9 can be opened or folded along with the front support 1 and the rear support 2, improving the convenience of use.

[0043] Referring to FIGS. 3 and 9, the working principle of the folding wheelchair 100 of the embodiment of the present application will be described in detail as follows:

[0044] When the folding wheelchair 100 needs to be folded, the first driving device 4 is started, the output end of the first driving device 4 drives the sliding block 41 to slide backward along the sliding groove 21, the sliding block 41 drives the first driving member 6, and the first driving member 6 drives the seat plate 3 to close and fold around the pivot shaft 1a toward the rear support 2. At the same time, the second driving device 5 is started, the output end of the second driving device 5 is retracted, drives the cross rod 71, and the cross rod 71 drives the connecting seat 72 to drive the front support 1 to close and fold around the pivot shaft 1a toward the rear support 2. At the same time, the front support 1 is folded, the pedal 9 is driven by the linkage rod 10 to close and fold toward the rear support 2. Finally, the seat plate 3, the front support 1 and the rear support 2 are closed together. Then, the locking pin 84 is pulled out of the insertion hole to release the variable parallelogram structure. At this time, the handle is manually pushed to make the first connecting rod 81 and the second connecting rod 82 close and fold toward the rear support 2, and the armrest 83 is folded. At this time, the folding wheelchair 100 can be completely folded. When the folding wheelchair 100 needs to be unfolded, the armrest 83 is operated in the opposite direction, and the first driving device 4 and the second driving device 5 are started, so that the armrest structure 8, the seat plate 3, the front support 1 are unfolded relative to the rear support 2.

[0045] Compared with the prior art, the folding wheelchair 100 is folded by the first driving device 4 and the second driving device 5 driving the seat plate 3 and the front support 1 to move towards the rear support 2. Therefore, the folding wheelchair 100 is driven by two driving devices, so that the linkage rod or the connecting rod as the intermediate linkage mechanism can be greatly reduced, the structure of the folding wheelchair 100 is greatly simplified, the structure of the folding wheelchair 100 is very simple, and the folding wheelchair 100 can be automatically folded by controlling the two driving devices, which is very simple and convenient to use.

[0046] Referring to FIG. 10, a second embodiment of the present application is shown. The folding wheelchair 100' includes a front support 1', a rear support 2', a seat plate 3', a first driving device 4' and a first driving member 6'. The front support 1' is pivotally connected to the rear support 2' to form a herringbone structure. In this embodiment, the number of the front support 1' is two, and the number of the rear support 2' is one. The two front supports 1' are respectively pivotally connected to the two sides of the front end of the rear support 2'. The height of one end of the rear support 2' pivotally connected to the front support 1' is greater than the height of the other end of the rear support 2'. The seat plate 3' is pivotally connected to the rear support 2'. Specifically, the front end of the seat plate 3' has a seat body 31' pivotally connected to the rear support 2'. One end of the first driving device 4' is pivotally connected to the rear support 2'. The output end of the first driving device 4' is movably arranged and pivotally connected to one end of the first driving member 6'. The rear support 2' is provided with a sliding groove 21', and the output end of the first driving device 4' has a sliding block 41' movably arranged in the sliding groove 21'. One end of the first driving member 6' is pivotally connected to the sliding block 41'. The first driving device 4' is an electric push rod. The other end of the first driving member 6' is pivotally connected to the bottom of the seat plate 3' to drive the seat plate 3' to move towards the rear support 2'. The first driving member 6' is a rod member. In order to improve the comfort of riding, the first driving member 6' is a spring shock absorber.

[0047] As shown in FIG. 11, the third embodiment of the application is also disclosed, and the folding wheelchair 200' of the embodiment comprises front supports 21', a rear support 22', a seat plate 23', a second driving device 25' and a second driving member 27'. The front supports 21' are pivotally connected to the rear support 22' to form a herringbone structure. In the embodiment, the number of the front supports 21' is two, and the number of the rear support 22' is one. The two front supports 21' are respectively pivotally connected to the two sides of the front end of the rear support 22'. The height of one end of the rear support 22' pivotally connected to the front supports 21' is greater than the height of the other end of the rear support 22'. The seat plate 23' is arranged on the rear support 22'. One end of the second driving device 25' is pivotally connected to the rear support 22'. The output end of the second driving device 25' is arranged in an extendable manner and is pivotally connected to one end of the second driving member 27'. The second driving device 25' is an electric push rod. The second driving member 27' is a rod member. The other end of the second driving member 27' is fixedly connected to the front support 21' to drive the front support 21' to move towards the rear support 22'. The structure of the second driving member 27' is the same as that of the second driving member 7 of the first embodiment.

[0048] The above disclosed is only the preferred embodiment of the application, and of course cannot limit the scope of the application. Any equivalent changes made within the scope of the patent of the application still belong to the scope of the application.

Claims

1. A foldable wheelchair, characterized by: The folding wheelchair comprises a front support, a rear support, a seat plate, a first driving device, a second driving device, a first driving member and a second driving member, the front support is pivotally connected to the rear support, the seat plate is pivotally connected to the rear support, one end of the first driving device is pivotally connected to the rear support, the output end of the first driving device is movably arranged and pivotally connected to one end of the first driving member, the other end of the first driving member is pivotally connected to the seat plate to drive the seat plate to move towards the rear support, one end of the second driving device is pivotally connected to the rear support, the output end of the second driving device is telescopically arranged and pivotally connected to one end of the second driving member, the other end of the second driving member is fixedly connected to the front support to drive the front support to move towards the rear support.

2. The foldable wheelchair of claim 1, wherein: The pivot shafts of the seat plate and the rear support and the pivot shafts of the front support and the rear support are coaxially arranged.

3. The foldable wheelchair of claim 1, wherein: The front end of the seat plate is provided with a seat body, and the seat body is pivotally connected to the rear support.

4. The foldable wheelchair of claim 1, wherein: The rear support is provided with a sliding groove, the output end of the first driving device is provided with a sliding block, the sliding block is movably arranged in the sliding groove, and one end of the first driving member is pivotally connected to the sliding block.

5. The foldable wheelchair of claim 1, wherein: The folding wheelchair further comprises a handrail structure, and the handrail structure is pivotally connected to the rear support.

6. The foldable wheelchair of claim 5, wherein: The handrail structure comprises a first connecting rod, a second connecting rod and a handrail, the lower end of the first connecting rod is pivotally connected to the rear support, the upper end of the first connecting rod is pivotally connected to the handrail, the lower end of the second connecting rod is pivotally connected to the rear support, the upper end of the second connecting rod is pivotally connected to the handrail, and the first connecting rod, the second connecting rod, the handrail and the rear support form a deformable quadrilateral structure.

7. The foldable wheelchair of claim 6, wherein: The handrail structure further comprises a locking pin, the locking pin is movably arranged between the handrail and one of the first connecting rod and the second connecting rod to lock or release the deformable quadrilateral structure.

8. The foldable wheelchair of claim 7, wherein: One side of the handrail is pivotally provided with an operation handle, the locking pin is arranged on the operation handle, and the operation handle can drive the locking pin to be inserted into or separated from the insertion hole of one of the first connecting rod and the second connecting rod when the operation handle is turned up and down, so as to realize the locking or releasing of the deformable quadrilateral structure.

9. The foldable wheelchair of claim 8, wherein: The extension direction of the pivot shaft of the operation handle is along the front-rear direction of the handrail, one side of the operation handle is provided with a sliding groove, the direction of the sliding groove is along the up-down direction of the handrail, and one end of the locking pin is slidably arranged in the sliding groove.

10. The foldable wheelchair of claim 9, wherein: The sliding groove is a T-shaped groove, and the end of the locking pin is a T-shaped head matched with the T-shaped groove; the depth of the T-shaped groove is greater than the thickness of the T-shaped head.

11. The foldable wheelchair of claim 10, wherein: The outer side of one end of the locking pin close to the T-shaped head is provided with a limiting groove, and the opening edge of the T-shaped groove is clamped in the limiting groove; the width of the limiting groove is greater than the thickness of the opening edge of the T-shaped groove.

12. The foldable wheelchair of claim 7, wherein: The handrail is provided with a guide hole, the opening diameters of two ends of the guide hole are smaller than the inner diameter of the middle hole, and the locking pin slidably passes through the guide hole.

13. The foldable wheelchair of claim 7, wherein: The handrail structure further comprises an elastic reset member, and the elastic reset member is arranged between the locking pin and the handrail.

14. The foldable wheelchair of claim 1, wherein: The second driving member comprises a crossbar and connecting seats arranged at two ends of the crossbar, and the connecting seats are provided with connecting flanges fixedly connected with the front support on the side.

15. The foldable wheelchair of claim 1, wherein: The folding wheelchair further comprises a pedal, one end of the pedal is pivotally connected with the lower end of the front support, and a linkage rod is pivotally connected between the other end of the pedal and the rear support, and a variable parallelogram structure is formed between the front support, the rear support, the pedal and the linkage rod.

16. A foldable wheelchair characterized by: The folding wheelchair comprises a front support, a rear support, a seat plate, a first driving device and a first driving member, the front support is connected with the rear support, the seat plate is pivotally connected with the rear support, one end of the first driving device is pivotally connected with the rear support, the output end of the first driving device is movably arranged and pivotally connected with one end of the first driving member, and the other end of the first driving member is pivotally connected with the seat plate to drive the seat plate to move towards the rear support.

17. A foldable wheelchair, characterized by: The folding wheelchair comprises a front support, a rear support, a second driving device and a second driving member, the front support is pivotally connected with the rear support, one end of the second driving device is pivotally connected with the rear support, the output end of the second driving device is movably arranged and pivotally connected with one end of the second driving member, and the other end of the second driving member is fixedly connected with the front support to drive the front support to move towards the rear support.

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