Foldable wheelchair high in compactness degree after being folded

Abstract

The invention provides a foldable wheelchair high in compactness degree after being folded. Comprising a front wheel bracket, a rear wheel bracket, a backrest bracket, a seat bracket, a front supporting rod, a rear supporting rod and a bottom supporting rod, wherein the upper end part of the rear supporting rod is rotationally connected with the rear part of the seat bracket; the lower end part of the rear supporting rod is rotationally connected with the upper part of the front wheel bracket; the front supporting rod is divided into the front upper supporting rod and the front lower supporting rod from the connecting position of the front supporting rod and the bottom supporting rod, the lower end portion of the front upper supporting rod, the upper end portion of the front lower supporting rod and the upper end portion of the bottom supporting rod are connected in a rotating mode through the same rotating shaft, and the front lower supporting rod, the front wheel support, the rear wheel support and the bottom supporting rod can form an X-shaped four-connecting-rod mechanism. The backrest support, the seat support, the rear supporting rod and the front wheel support form an inverted trapezoidal four-connecting-rod mechanism, the seat support, the rear supporting rod, the front wheel support, the front upper supporting rod and the front lower supporting rod form a five-connecting-rod mechanism, all rod pieces are short, the overall height after folding is low, the compact degree is high, and carrying and cabinet loading transportation are easy.

Description

Technical Field

[0001] The invention belongs to the technical field of wheelchairs, and in particular relates to a foldable wheelchair which is highly compact after being folded and is easy to carry and transport in a container. Background Art

[0002] A wheelchair is a medical device that assists patients in treatment and rehabilitation. For ease of storage, foldable wheelchairs have appeared on the market. Most existing foldable wheelchairs have only one or two sets of four-bar linkages. For example, Chinese patents CN111671584A and CN112674953A disclose such foldable wheelchairs. Since the lengths of the rods are relatively long, the overall height after folding is relatively high, the compactness is relatively low, and it is difficult to support the wheelchair on the ground through the front and rear wheels, making it inconvenient to carry and transport it in a container. Summary of the invention

[0003] The purpose of the present invention is to overcome one or more disadvantages of the prior art and to provide a foldable wheelchair which is highly compact after folding and is easy to carry and transport in a container.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is a foldable wheelchair with high compactness after folding, comprising:

[0005] A front wheel bracket, the front wheel bracket extending obliquely from the front lower side to the rear upper side;

[0006] A rear wheel bracket, wherein the rear wheel bracket extends obliquely from the rear lower portion to the front upper portion, and the upper end portion of the rear wheel bracket is rotatably connected to the upper end portion of the front wheel bracket;

[0007] A backrest bracket, the backrest bracket extends obliquely from the upper rear portion to the lower front portion, and the lower end portion of the backrest bracket is rotatably connected to the upper end portion of the front wheel bracket;

[0008] A seat support, the seat support extending in the front-rear direction, the rear end of the seat support being rotatably connected to the lower part of the backrest support;

[0009] A front support rod, wherein the upper end of the front support rod is rotatably connected to the middle portion of the seat support, and the lower end of the front support rod is rotatably connected to the middle portion of the front wheel support;

[0010] A rear support rod, wherein the upper end of the rear support rod is rotatably connected to the rear portion of the seat support, and the lower end of the rear support rod is rotatably connected to the upper portion of the front wheel support;

[0011] A bottom support rod, wherein the upper end of the bottom support rod is rotatably connected to the middle portion of the front support rod, and the lower end of the bottom support rod is rotatably connected to the middle portion of the rear wheel bracket;

[0012] The front support rod is divided into two sections from the connection with the bottom support rod, namely a front upper support rod located at the top and a front lower support rod located at the bottom. The lower end of the front upper support rod, the upper end of the front lower support rod and the upper end of the bottom support rod are rotatably connected through the same rotating shaft.

[0013] Preferably, the foldable wheelchair also includes a locking mechanism for locking the relative positions of the front upper support rod and the front lower support rod, the locking mechanism includes a locking pin provided on one of the front upper support rod and the front lower support rod, and a locking hole provided on the other, when the locking pin is inserted into the locking hole, the relative positions of the front upper support rod and the front lower support rod are locked and located in the same straight line, when the locking pin is disengaged from the locking hole, the front upper support rod can rotate relative to the front lower support rod.

[0014] Further preferably, the upper end of the front lower support rod is provided with a support plate extending upward to the left and / or right side of the front upper support rod, the locking pin is vertically pluggable and inserted into the support plate, and the locking hole is opened at the lower end of the front upper support rod and corresponds to the locking pin.

[0015] Further preferably, there is only one locking pin and one locking hole, and the support plate extends to the left side, the right side and the front side of the front upper support rod, so that the front upper support rod cannot rotate forward relative to the front lower support rod.

[0016] Preferably, a connecting block is fixedly provided at the upper end of the front wheel bracket, the upper end of the connecting block is rotatably connected to the lower end of the backrest bracket, and the lower end of the connecting block is rotatably connected to the upper end of the rear wheel bracket.

[0017] Preferably, a rotatable front wheel is connected to the lower end of the front wheel bracket, and the rotation axis of the front wheel extends in the left-right direction.

[0018] Further preferably, the lower end of the front wheel bracket is also connected to a foot pedal assembly, and the foot pedal assembly includes a foot pedal connecting rod rotatably connected to the lower end of the front wheel bracket and a foot pedal rotatably connected to the foot pedal connecting rod, the rotation axis line of the foot pedal connecting rod and the rotation axis line of the foot pedal are parallel to the rotation axis line of the front wheel. When folded, the foot pedal can be rotated to between the front wheels below the front wheel bracket and on both sides through the rotation of the foot pedal connecting rod relative to the front wheel bracket and the rotation of the foot pedal relative to the foot pedal connecting rod.

[0019] Preferably, a rear wheel assembly is connected to the lower end of the rear wheel bracket, and the rear wheel assembly includes a rotatable rear wheel and a hub motor for driving the rear wheel to rotate.

[0020] Further preferably, the rear wheel bracket is connected to an anti-tip wheel assembly, the anti-tip wheel assembly includes an anti-tip wheel bracket rotatably connected to the lower end of the rear wheel bracket in a 7-shape and an anti-tip wheel rotatably connected to the end of the anti-tip wheel bracket, the rotation axis of the anti-tip wheel bracket is perpendicular to the rotation axis of the rear wheel and the rear wheel bracket, the rotation axis of the anti-tip wheel is parallel to the rotation axis of the rear wheel, and when folded, the anti-tip wheel can be flipped up to a lowest point higher than the rear wheel by rotating the anti-tip wheel bracket.

[0021] Further preferably, a battery frame is suspended on the bottom support rod, and a battery pack for supplying power to the hub motor is inserted into the battery frame.

[0022] Preferably, the foldable wheelchair also includes an armrest assembly, which includes an armrest rod extending in the front-to-back direction and an armrest support rod extending obliquely from the upper front to the lower rear, the rear portion of the armrest rod being rotatably and slidingly connected to the middle portion of the backrest bracket, the upper end portion of the armrest support rod being rotatably connected to the middle portion of the armrest rod, and the lower end portion of the armrest support rod being rotatably connected to the lower portion of the backrest bracket.

[0023] Further preferably, the rear portion of the armrest rod is provided with a waist-shaped groove extending in the front-to-back direction, a slidable and rotatable shaft is provided in the waist-shaped groove, and the root of the shaft is connected to the middle portion of the backrest bracket, so that the rear portion of the armrest rod is rotatably and slidably connected to the middle portion of the backrest bracket.

[0024] Further preferably, the lower end of the armrest support rod and the rear end of the seat support are rotatably connected to the lower portion of the backrest support via the same rotation axis.

[0025] Further preferably, the armrest assembly further comprises a controller rotatably connected to the front end of the armrest rod, the rotation axis of the controller is perpendicular to the armrest rod, and when folded, the controller can be rotated to not exceed the armrest rod.

[0026] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0027] By dividing the front support rod into a front upper support rod and a front lower support rod at the connection with the bottom support rod, and making the lower end of the front upper support rod, the upper end of the front lower support rod and the upper end of the bottom support rod rotatably connected through the same rotating shaft, the front lower support rod, the front wheel bracket, the rear wheel support frame and the bottom support rod can form an X-shaped four-bar linkage, the backrest bracket, the seat bracket, the rear support rod and the front wheel bracket can form an inverted trapezoidal four-bar linkage with a long upper bottom and a short lower bottom, and the seat bracket, the rear support rod, the front wheel bracket, the front upper support rod and the front lower support rod can form a five-bar linkage. The number of linkage mechanisms is large, the length of each rod is short, the overall height after folding is low, the compactness is high, and it is easy to carry and transport in a container. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a left schematic diagram of a preferred embodiment of the present invention.

[0029] Figure 2 , Figure 3 , Figure 4 yes Figure 1 Diagram of the process of transformation to the folded state.

[0030] Figure 5 yes Figure 1 Schematic diagram when transforming to the folded state.

[0031] Figure 6 yes Figure 1 A three-dimensional schematic diagram of .

[0032] Figure 7 yes Figure 5 A three-dimensional schematic diagram of .

[0033] Figure 8 yes Figure 1 Assembly breakdown diagram of .

[0034] Fig. 9 yes Figure 1 Schematic diagram of the center armrest assembly when folded.

[0035] Fig.10 yes Figure 1 Schematic diagram of the top view of the middle armrest assembly.

[0036] Fig.11 yes Figure 5 Schematic diagram of the top view of the middle armrest assembly.

[0037] Fig.12 yes Figure 1 A partial enlarged schematic diagram of the center front support rod.

[0038] Fig.13 yes Fig.12 Schematic front view of .

[0039] Fig.14 yes Figure 3 A partial enlarged schematic diagram of the center front support rod.

[0040] Fig.15 yes Fig.14 Schematic front view of .

[0041] Fig.16 yes Figure 1 A partial enlarged schematic diagram of the middle pedal assembly.

[0042] Fig.17 yes Figure 5 A partial enlarged schematic diagram of the middle pedal assembly.

[0043] Fig.18 yes Fig.16 Transform to Fig.17 Schematic diagram of the process.

[0044] Fig.19 yes Figure 1 Schematic diagram of the rear view of the middle anti-roll wheel assembly.

[0045] Fig. 20 yes Figure 5 Schematic diagram of the rear view of the middle anti-roll wheel assembly.

[0046] Among them: 10. front wheel bracket; 11. connecting block; 12. front wheel; 13. pedal connecting rod; 14. pedal; 20. rear wheel bracket; 21. rear wheel; 22. hub motor; 23. anti-roll wheel bracket; 24. anti-roll wheel; 30. backrest bracket; 40. seat bracket; 50. front support rod; 51. front upper support rod; 52. front lower support rod; 53. support plate; 60. rear support rod; 70. bottom support rod; 71. battery frame; 72. battery pack; 81. locking pin; 82. locking hole; 91. handrail rod; 92. handrail support rod; 93. waist groove; 94. rotating shaft; 95. controller. DETAILED DESCRIPTION

[0047] The front-back, left-right, and up-down directions described in the present invention are the front-back, left-right, and up-down directions observed by the user when riding the foldable wheelchair.

[0048] like Figures 1 to 20As shown, the foldable wheelchair provided by the present invention has a high degree of compactness after folding, and comprises a front wheel bracket 10, a rear wheel bracket 20, a backrest bracket 30, a seat bracket 40, a front support rod 50, a rear support rod 60 and a bottom support rod 70, wherein the front wheel bracket 10 extends obliquely from the front lower direction to the rear upper direction; the rear wheel bracket 20 extends obliquely from the rear lower direction to the front upper direction, and the upper end of the rear wheel bracket 20 is rotatably connected to the upper end of the front wheel bracket 10; the backrest bracket 30 extends obliquely from the rear upper direction to the front lower direction, and the lower end of the backrest bracket 30 is rotatably connected to the upper end of the front wheel bracket 10; The end is rotatably connected to the upper end of the front wheel bracket 10; the seat bracket 40 extends in the front and rear directions, and the rear end of the seat bracket 40 is rotatably connected to the lower part of the backrest bracket 30; the upper end of the front support rod 50 is rotatably connected to the middle part of the seat bracket 40, and the lower end of the front support rod 50 is rotatably connected to the middle part of the front wheel bracket 10; the upper end of the rear support rod 60 is rotatably connected to the rear of the seat bracket 40, and the lower end of the rear support rod 60 is rotatably connected to the upper part of the front wheel bracket 10; the upper end of the bottom support rod 70 is connected to the front support rod 5 0 is rotatably connected to the middle part of the rear wheel bracket 20, and the lower end of the bottom support rod 70 is rotatably connected to the middle part of the rear wheel bracket 20; the front support rod 50, the front wheel bracket 10, the rear wheel bracket 30 and the bottom support rod 70 form an X-shaped four-bar linkage, the seat bracket 40, the backrest bracket 30, the front wheel bracket 10 and the rear support rod 60 form an inverted trapezoidal four-bar linkage with a long upper bottom and a short lower bottom, and the seat bracket 40, the front support rod 50, the front wheel bracket 10 and the rear support rod 60 form a positive trapezoidal four-bar linkage with a short upper bottom and a long lower bottom. The structure is arranged adjacent to the regular trapezoidal four-bar linkage and shares the seat bracket 40, the rear support rod 60 and the front wheel bracket 10. No matter whether they are locked or not, they cannot be deformed, resulting in the foldable wheelchair being unable to be folded. To solve this problem, the present application divides the front support rod 50 into two sections from the connection with the bottom support rod 70, namely, a front upper support rod 51 located at the top and a front lower support rod 52 located at the bottom. The lower end of the front upper support rod 51 and the upper end of the front lower support rod 52 are rotatably connected to the upper end of the bottom support rod 70 via the same rotating shaft.

[0049] The advantage of such an arrangement is that the regular trapezoidal four-bar linkage consisting of the seat support 40, the front support rod 50, the front wheel support 10 and the rear support rod 60 with a short upper base and a long lower base can be transformed into a five-bar linkage consisting of the seat support 40, the front upper support rod 51, the front lower support rod 52, the front wheel support 10 and the rear support rod 60, so that the foldable wheelchair can be folded. At the same time, due to the large number of linkage mechanisms and the short length of each rod, the overall height of the foldable wheelchair after folding is low and the compactness is high, making it easy to carry and transport in a container.

[0050] In this embodiment, the foldable wheelchair further comprises a locking mechanism for locking the relative positions of the front upper support rod 51 and the front lower support rod 52. The locking mechanism comprises a locking pin 81 disposed on the front lower support rod 52 and a locking hole 82 disposed on the front upper support rod 51. When the locking pin 81 is inserted into the locking hole 82, the relative positions of the front upper support rod 51 and the front lower support rod 52 are locked and located in the same straight line, so that the foldable wheelchair is kept in the unfolded state. When the locking pin 81 is disengaged from the locking hole 82, the front upper support rod 51 can rotate relative to the front lower support rod 52, so that the foldable wheelchair is in the unfolded state. The foldable wheelchair can be transformed into a folded state; specifically, the upper end of the front lower support rod 52 is provided with a support plate 53 extending upward to the left and right sides of the front upper support rod 51, and the locking pin 81 can be vertically inserted and pulled through the support plate 53, and the locking hole 82 is opened at the lower end of the front upper support rod 51 and corresponds to the locking pin 81; there is only one locking pin 81 and one locking hole 82, and the support plate 53 also extends to the front side of the front upper support rod 51, so that the front upper support rod 51 cannot rotate forward relative to the front lower support rod 52, so as to realize single locking in the rotation direction.

[0051] In this embodiment, a connecting block 11 is fixed to the upper end of the front wheel bracket 10, and the upper end of the connecting block 11 is rotatably connected to the lower end of the backrest bracket 30, and the lower end of the connecting block 11 is rotatably connected to the upper end of the rear wheel bracket 20, that is, the rotation axis of the front wheel bracket 10 and the backrest bracket 30 is higher than the rotation axis of the front wheel bracket 10 and the rear wheel bracket 20, and these two rotation axes are deviated from the extension direction of the front wheel bracket 10. The advantage of such an arrangement is that when folding, the backrest bracket 30 can be brought closer to the front wheel bracket 10, and the rear wheel bracket 20 can be brought closer to the front wheel bracket 10, so as to further reduce the overall height of the foldable wheelchair after folding and improve its compactness after folding.

[0052] In this embodiment, a rotatable front wheel 12 is connected to the lower end of the front wheel bracket 10, and the rotation axis of the front wheel 12 extends in the left-right direction; in order to improve the comfort of use, a pedal assembly is also connected to the lower end of the front wheel bracket 10, and the pedal assembly includes a pedal connecting rod 13 rotatably connected to the lower end of the front wheel bracket 10 and a pedal 14 rotatably connected to the pedal connecting rod 13. The pedal connecting rod 13 is L-shaped, and has a vertical end and a horizontal end. The upper end of the vertical end is rotatably connected to the front wheel bracket 10 and can be rotated in the clockwise direction to set an angle, and the horizontal end The footrest 14 is rotatably connected to the end of the lateral end and can be rotated in a clockwise direction to a set angle. The rotation axis of the footrest connecting rod 13 and the rotation axis of the footrest 14 are parallel to the rotation axis of the front wheel 12. When folding, the footrest connecting rod 13 is rotated relative to the front wheel bracket 10, and the footrest 14 is rotated relative to the footrest connecting rod 13. The footrest 14 can be rotated to the bottom of the front wheel bracket 10 and between the front wheels 12 on both sides, thereby further reducing the overall length of the foldable wheelchair after folding and improving its compactness after folding.

[0053] In the present embodiment, a rear wheel assembly is connected to the lower end of the rear wheel bracket 20, and the rear wheel assembly includes a rotatable rear wheel 21 and a hub motor 22 for driving the rear wheel 21 to rotate; to improve safety, further, an anti-tip wheel assembly is connected to the rear wheel bracket 20, and the anti-tip wheel assembly includes an anti-tip wheel bracket 23 rotatably connected to the lower end of the rear wheel bracket 20 in a 7-shape and an anti-tip wheel 24 rotatably connected to the end of the anti-tip wheel bracket 23, the rotation axis of the anti-tip wheel bracket 23 is perpendicular to the rotation axis of the rear wheel 21 and the rear wheel bracket 20, and the rotation axis of the anti-tip wheel 24 is parallel to the rotation axis of the rear wheel 21. When folding, by rotating the anti-tip wheel bracket 23, the anti-tip wheel 24 can be flipped up to a point higher than the lowest point of the rear wheel 21, so as to improve the compactness of the foldable wheelchair after folding.

[0054] For the convenience of driving, in the present embodiment, a battery frame 71 is suspended on the bottom support rod 70 , and a battery pack 72 for supplying power to the hub motor 22 is inserted into the battery frame 71 .

[0055] To improve the comfort of use, in the present embodiment, the foldable wheelchair also includes an armrest assembly, which includes an armrest rod 91 extending in the front-to-back direction, an armrest strut 92 extending obliquely from the upper front to the lower rear, the rear portion of the armrest rod 91 is rotatably and slidably connected to the middle portion of the backrest bracket 30, the upper end portion of the armrest strut 92 is rotatably connected to the middle portion of the armrest rod 91, and the lower end portion of the armrest strut 92 is rotatably connected to the lower portion of the backrest bracket 30; specifically, a waist-shaped groove 93 extending in the front-to-back direction is provided at the rear portion of the armrest rod 91, a slidable and rotatable rotating shaft 94 is provided in the waist-shaped groove 93, the root of the rotating shaft 94 is connected to the middle portion of the backrest bracket 30, so that the rear portion of the armrest rod 91 is rotatably and slidably connected to the middle portion of the backrest bracket 30; further, the armrest rod 91 and the front wheel bracket 10 are located in the same plane, and the armrest strut 92 is located on the outside of the armrest rod 91.

[0056] To simplify the structure, further, the lower end of the armrest support rod 91 and the rear end of the seat support 40 are rotatably connected to the lower part of the backrest support 30 via the same rotation axis.

[0057] To facilitate the control of the hub motor 22, in the present embodiment, the armrest assembly also includes a controller 95 rotatably connected to the front end of the armrest rod 91, and the rotation axis of the controller 95 is perpendicular to the armrest rod 91. When folding, the controller 95 can be rotated to not exceed the armrest rod 91, so as to reduce the overall length of the foldable wheelchair after folding and improve its compactness after folding.

[0058] The folding and unfolding process of the foldable wheelchair is described below:

[0059] When the locking pin 71 is disengaged from the locking hole 72 (unlocked), first rotate the pedal bracket clockwise to the folded position, then rotate the pedal to the folded position, then rotate the anti-tip wheel bracket 23 to turn up the anti-tip wheel 24, then rotate the controller 95 to the folded position, and then flip the backrest bracket 30 counterclockwise, and the above-mentioned X-shaped four-bar linkage, inverted trapezoidal four-bar linkage and five-bar linkage can drive each rod to move closer to the front wheel bracket 10 to achieve folding. During the folding process, when the handrail rod 91 touches the front wheel bracket 10, it can automatically fold closer to the backrest bracket 30; the above operation can be reversed to open the entire frame.

[0060] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A foldable wheelchair having a high degree of compactness after folding, comprising: A front wheel bracket, the front wheel bracket extending obliquely from the front lower side to the rear upper side; A rear wheel bracket, wherein the rear wheel bracket extends obliquely from the rear lower portion to the front upper portion, and the upper end portion of the rear wheel bracket is rotatably connected to the upper end portion of the front wheel bracket; A backrest bracket, the backrest bracket extends obliquely from the upper rear portion to the lower front portion, and the lower end portion of the backrest bracket is rotatably connected to the upper end portion of the front wheel bracket; A seat support, the seat support extending in the front-rear direction, the rear end of the seat support being rotatably connected to the lower part of the backrest support; A front support rod, wherein the upper end of the front support rod is rotatably connected to the middle portion of the seat support, and the lower end of the front support rod is rotatably connected to the middle portion of the front wheel support; A rear support rod, wherein the upper end of the rear support rod is rotatably connected to the rear portion of the seat support, and the lower end of the rear support rod is rotatably connected to the upper portion of the front wheel support; A bottom support rod, wherein the upper end of the bottom support rod is rotatably connected to the middle portion of the front support rod, and the lower end of the bottom support rod is rotatably connected to the middle portion of the rear wheel bracket; Features: The front support rod is divided into two sections from the connection with the bottom support rod, namely a front upper support rod located at the top and a front lower support rod located at the bottom. The lower end of the front upper support rod, the upper end of the front lower support rod and the upper end of the bottom support rod are rotatably connected through the same rotating shaft.

2. The foldable wheelchair according to claim 1, characterized in that: The foldable wheelchair also includes a locking mechanism for locking the relative positions of the front upper support rod and the front lower support rod, the locking mechanism includes a locking pin provided on one of the front upper support rod and the front lower support rod, and a locking hole provided on the other one, when the locking pin is inserted into the locking hole, the relative positions of the front upper support rod and the front lower support rod are locked and located in the same straight line, when the locking pin is disengaged from the locking hole, the front upper support rod can rotate relative to the front lower support rod.

3. The foldable wheelchair according to claim 2, characterized in that: The upper end of the front lower support rod is provided with a support plate extending upward to the left and / or right side of the front upper support rod, and the locking pin is vertically inserted and pulled out through the support plate, and the locking hole is opened at the lower end of the front upper support rod and corresponds to the locking pin.

4. The foldable wheelchair according to claim 3, characterized in that: There is only one locking pin and one locking hole, and the support plate extends to the left side, the right side and the front side of the front upper support rod, so that the front upper support rod cannot rotate forward relative to the front lower support rod.

5. The foldable wheelchair according to claim 1, characterized in that: A connecting block is fixedly arranged at the upper end of the front wheel bracket, the upper end of the connecting block is rotatably connected to the lower end of the backrest bracket, and the lower end of the connecting block is rotatably connected to the upper end of the rear wheel bracket.

6. The foldable wheelchair according to claim 1, characterized in that: The lower end of the front wheel bracket is connected with a rotatable front wheel, and the rotation axis of the front wheel extends in the left-right direction.

7. The foldable wheelchair according to claim 6, characterized in that: The lower end of the front wheel bracket is also connected to a foot pedal assembly, which includes a foot pedal connecting rod rotatably connected to the lower end of the front wheel bracket and a foot pedal rotatably connected to the foot pedal connecting rod, the rotation axis of the foot pedal connecting rod and the rotation axis of the foot pedal are parallel to the rotation axis of the front wheel. When folded, the foot pedal can be rotated to between the front wheels below the front wheel bracket and on both sides through the rotation of the foot pedal connecting rod relative to the front wheel bracket and the rotation of the foot pedal relative to the foot pedal connecting rod.

8. The foldable wheelchair according to claim 1, characterized in that: The lower end of the rear wheel bracket is connected with a rear wheel assembly, and the rear wheel assembly includes a rotatable rear wheel and a hub motor for driving the rear wheel to rotate.

9. The foldable wheelchair according to claim 8, characterized in that: The rear wheel bracket is connected to an anti-tip wheel assembly, and the anti-tip wheel assembly includes an anti-tip wheel bracket rotatably connected to the lower end of the rear wheel bracket in a 7-shape and an anti-tip wheel rotatably connected to the end of the anti-tip wheel bracket, the rotation axis of the anti-tip wheel bracket is perpendicular to the rotation axis of the rear wheel and the rear wheel bracket, and the rotation axis of the anti-tip wheel is parallel to the rotation axis of the rear wheel. When folding, the anti-tip wheel can be flipped up to a lowest point higher than the rear wheel by rotating the anti-tip wheel bracket.

10. The foldable wheelchair according to claim 8, characterized in that: A battery frame is suspended on the bottom support rod, and a battery pack for supplying power to the hub motor is inserted in the battery frame.

11. The foldable wheelchair according to claim 1, characterized in that: The foldable wheelchair also includes an armrest assembly, which includes an armrest rod extending in the front-to-back direction and an armrest support rod extending obliquely from the upper front to the lower rear, the rear portion of the armrest rod is rotatably and slidably connected to the middle portion of the backrest bracket, the upper end portion of the armrest support rod is rotatably connected to the middle portion of the armrest rod, and the lower end portion of the armrest support rod is rotatably connected to the lower portion of the backrest bracket.

12. The foldable wheelchair according to claim 11, characterized in that: The rear part of the handrail rod is provided with a waist-shaped groove extending in the front-to-back direction, and a slidable and rotatable shaft is provided in the waist-shaped groove. The root of the shaft is connected to the middle part of the backrest bracket, so that the rear part of the handrail rod is rotatably and slidably connected with the middle part of the backrest bracket.

13. The foldable wheelchair according to claim 11, characterized in that: The lower end of the armrest support rod and the rear end of the seat support are rotatably connected to the lower part of the backrest support through the same rotation axis.

14. The foldable wheelchair according to claim 11, characterized in that: The armrest assembly also includes a controller rotatably connected to the front end of the armrest rod, the rotation axis of the controller is perpendicular to the armrest rod, and when folded, the controller can be rotated to not exceed the armrest rod.

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