Left-right foldable wheelchair

Abstract

A left-right foldable wheelchair, comprising side frames (10), wheel assemblies, a seat assembly (30), and a locking mechanism. Each of the side frames (10) comprises a bottom support rod (11), a seat support rod (12), a rear vertical rod (13), and a front connecting rod (14). The seat assembly (30) comprises first to fourth rods extending along a left-right direction. The first rod (31), the second rod (32), the third rod (33), the fourth rod (34), and the seat support rods (12) on both sides form a first six-rod connection mechanism. The seat assembly (30) further comprises a first connecting rod (35) and a second connecting rod (36) which are arranged in an X-shaped cross configuration. A front end portion of the first connecting rod (35) is rotatably connected to a middle portion of the first rod (31), a rear end portion of the first connecting rod (35) is rotatably connected to a middle portion of the fourth rod (34), a front end portion of the second connecting rod (36) is rotatably connected to a middle portion of the second rod (32), and a rear end portion of the second connecting rod (36) is rotatably connected to a middle portion of the third rod (33). When the locking mechanism is unlocked, the side frames (10) on both sides can be moved closer to each other along the left-right direction, causing the first and second connecting rods to drive the first six-rod connection mechanism to actuate, thereby achieving left-right folding. The structure is novel and occupies minimal space after folding.

Description

A foldable wheelchair that can be folded left and right Technical Field

[0001] The present invention belongs to the technical field of medical devices, and in particular relates to a left-right foldable wheelchair. Background Art

[0002] Wheelchairs are medical devices that assist patients in treatment and rehabilitation. In order to facilitate storage, foldable wheelchairs have appeared on the market. Most common foldable wheelchairs are front-to-back folding types. When folding or unfolding, a certain amount of operating space is required in the front-to-back direction, which is not applicable in some cases. Some foldable wheelchairs are left-to-right folding types, but this type of solution generally has the problem of occupying a large space after folding and weak rigidity when unfolded, which poses certain safety hazards when used. Summary of the Invention

[0003] The object of the present invention is to overcome one or more shortcomings of the prior art and to provide a left-right foldable wheelchair with a novel structure and a small space occupied after folding.

[0004] To achieve the above-mentioned object, the technical solution adopted by the present invention is a left-right foldable wheelchair, comprising two side supports provided on left and right sides, and a seat assembly provided between the two side supports, wherein the side supports include a bottom support rod extending in a horizontal direction, a seat support rod provided parallel and above the bottom support rod, a rear upright rod connected to the rear ends of the bottom support rod and the seat support rod and extending in a vertical direction, and a front connecting rod connecting the front ends of the bottom support rod and the seat support rod;

[0005] The seat assembly includes a first rod, a second rod, a third rod, and a fourth rod extending in the left-right direction, wherein the left end of the first rod is rotatably connected to the front end of the seat stay of the left side bracket, the right end of the second rod is rotatably connected to the front end of the seat stay of the right side bracket, the left end of the third rod is rotatably connected to the rear end of the seat stay of the left side bracket, and the right end of the fourth rod is rotatably connected to the rear end of the seat stay of the right side bracket; the right end of the first rod is rotatably connected to the left end of the second rod, and the right end of the third rod is rotatably connected to the left end of the fourth rod, so that the first rod, the second rod, the third rod, the fourth rod, and the seat stays on both sides form a first six-bar linkage;

[0006] The seat assembly also includes a first link and a second link that cross in an X shape, the front end of the first link being rotatably connected to the middle of the first rod, the rear end of the first link being rotatably connected to the middle of the fourth rod, the front end of the second link being rotatably connected to the middle of the second rod, and the rear end of the second link being rotatably connected to the middle of the third rod. When the side brackets on both sides approach each other in the left and right directions, the first six-link mechanism can be driven by the first link and the second link to achieve left and right folding of the foldable wheelchair.

[0007] Preferably, the first rod and the second rod are located in the same vertical plane, and the third rod and the fourth rod are located in the same vertical plane.

[0008] Preferably, the first rod and the second rod are staggered in the vertical direction, the third rod and the fourth rod are staggered in the vertical direction, the first rod and the fourth rod are located in the same horizontal plane, and the second rod and the third rod are located in the same horizontal plane.

[0009] Further preferably, the second connecting rod, the first rod and the fourth rod are located on the same horizontal plane.

[0010] Preferably, the foldable wheelchair further includes a locking mechanism for locking it in the unfolded state, the locking mechanism including a locking hole and a locking pin, the locking hole being arranged at the left end portion of the fourth rod, the locking pin being pluggable and arranged at the right end portion of the third rod and corresponding to the locking hole, the locking mechanism being locked when the locking pin is inserted into the locking hole, and being unlocked when the locking pin is disengaged from the locking hole.

[0011] Further preferably, the locking pin is located above the fourth rod.

[0012] Further preferably, the right end portion of the third rod is provided with a connecting plate extending horizontally to the right, the locking pin is pluggably inserted into the connecting plate, and the upper end surface of the locking pin is flush with the highest point of the third rod.

[0013] Preferably, the seat assembly further comprises a fifth rod, a sixth rod, a seventh rod and an eighth rod extending in the left-right direction, the left end portion of the fifth rod being rotatably connected to the front end portion of the bottom support rod of the left side bracket, the right end portion of the sixth rod being rotatably connected to the front end portion of the bottom support rod of the right side bracket, the left end portion of the seventh rod being rotatably connected to the rear end portion of the bottom support rod of the left side bracket, and the right end portion of the eighth rod being rotatably connected to the rear end portion of the bottom support rod of the right side bracket; the right end portion of the fifth rod being rotatably connected to the left end portion of the sixth rod, and the right end portion of the eighth rod being rotatably connected to the left end portion of the seventh rod, so that the fifth rod, the sixth rod, the seventh rod, the eighth rod and the bottom support rods on both sides constitute a second six-link mechanism.

[0014] Further preferably, the fifth rod is located directly below the first rod, the sixth rod is located directly below the second rod, the seventh rod is located directly below the third rod, and the eighth rod is located directly below the fourth rod.

[0015] Further preferably, the fifth rod and the sixth rod are staggered in the vertical direction, the seventh rod and the eighth rod are staggered in the vertical direction, the fifth rod and the eighth rod are located in the same horizontal plane, and the sixth rod and the seventh rod are located in the same horizontal plane.

[0016] Further preferably, the seat assembly further includes a first vertical rod, a second vertical rod, a third vertical rod and a fourth vertical rod, the two ends of the first vertical rod are respectively connected to the first rod and the fifth rod, the two ends of the second vertical rod are respectively connected to the second rod and the sixth rod, the two ends of the third vertical rod are respectively connected to the third rod and the seventh rod, and the two ends of the fourth vertical rod are respectively connected to the fourth rod and the eighth rod, so that the first six-bar linkage mechanism and the second six-bar linkage mechanism are interconnected to form a stable support frame.

[0017] Further preferably, the first vertical rod and the third vertical rod are arranged close to the side bracket on the left side, and the second vertical rod and the fourth vertical rod are arranged close to the side bracket on the right side.

[0018] Preferably, the upper end portion of the rear upright rod extends obliquely rearward and upward to form a push handle portion.

[0019] Preferably, the side bracket further comprises a handrail, the front end of the handrail extends forward and downward and is connected to the front end of the seat support rod, and the rear end of the handrail extends rearward and is connected to the middle portion of the rear upright rod.

[0020] The foldable wheelchair of claim 1, wherein the wheelchair is arranged at a position adjacent to the front wheelchair and is secured to the front of the vehicle when the vehicle is in the folded state.

[0021] The seat assembly includes a first rod, a second rod, a third rod, and a fourth rod extending in the left-right direction, the first rod and the second rod being located in the same vertical plane, the third rod and the fourth rod being located in the same vertical plane, the left end of the first rod being rotatably connected to the front end of the seat stay of the left side bracket, the right end of the first rod being rotatably connected to the left end of the second rod, the right end of the second rod being rotatably connected to the front end of the seat stay of the right side bracket, the left end of the third rod being rotatably connected to the rear end of the seat stay of the left side bracket, the right end of the third rod being rotatably connected to the left end of the fourth rod, and the right end of the fourth rod being rotatably connected to the rear end of the seat stay of the right side bracket, so that the first rod, the second rod, the third rod, the fourth rod, and the seat stays on both sides constitute a first six-bar linkage mechanism, the first rod and the second rod being staggered in the vertical direction, the third rod and the fourth rod being staggered in the vertical direction, the first rod and the fourth rod being located in the same horizontal plane, and the second rod and the third rod being located in the same horizontal plane;

[0022] The seat assembly further includes a fifth rod, a sixth rod, a seventh rod and an eighth rod extending in the left-right direction, the fifth rod being located directly below the first rod, the sixth rod being located directly below the second rod, the left end portion of the fifth rod being rotatably connected to the front end portion of the bottom support rod of the left side bracket, the right end portion of the fifth rod being rotatably connected to the left end portion of the sixth rod, and the right end portion of the sixth rod being rotatably connected to the front end portion of the bottom support rod of the right side bracket; the seventh rod being located directly below the third rod, the eighth rod being located directly below the fourth rod, the left end portion of the seventh rod being rotatably connected to the left The rear end of the bottom support rod of the side bracket is rotatably connected, the right end of the eighth rod is rotatably connected to the left end of the seventh rod, and the right end of the eighth rod is rotatably connected to the rear end of the bottom support rod of the right side bracket, so that the fifth rod, the sixth rod, the seventh rod, the eighth rod and the bottom support rods on both sides constitute a second six-bar linkage mechanism, the fifth rod and the sixth rod are staggered in the vertical direction, the seventh rod and the eighth rod are staggered in the vertical direction, the fifth rod and the eighth rod are located in the same horizontal plane, and the sixth rod and the seventh rod are located in the same horizontal plane;

[0023] The seat assembly further includes a first vertical rod, a second vertical rod, a third vertical rod, and a fourth vertical rod, wherein both ends of the first vertical rod are connected to the first rod and the fifth rod respectively, both ends of the second vertical rod are connected to the second rod and the sixth rod respectively, both ends of the third vertical rod are connected to the third rod and the seventh rod respectively, and both ends of the fourth vertical rod are connected to the fourth rod and the eighth rod respectively, so that the first six-bar linkage mechanism and the second six-bar linkage mechanism are interconnected to form a stable support frame; the first vertical rod and the third vertical rod are arranged near the left side bracket, and the second vertical rod and the fourth vertical rod are arranged near the right side bracket;

[0024] The seat assembly further includes a first connecting rod and a second connecting rod intersecting in an X shape, wherein the front end of the first connecting rod is rotatably connected to the middle portion of the first rod, the rear end of the first connecting rod is rotatably connected to the middle portion of the fourth rod, the front end of the second connecting rod is rotatably connected to the middle portion of the second rod, and the rear end of the second connecting rod is rotatably connected to the middle portion of the third rod; the second connecting rod is located on the same horizontal plane as the first rod and the fourth rod;

[0025] The locking mechanism includes a locking pin that is pluggable and arranged at the right end of the third rod. The locking pin is located above the fourth rod and corresponds to the locking hole set at the left end of the fourth rod. When the locking pin is inserted into the locking hole, the locking mechanism is locked; when the locking pin is disengaged from the locking hole, the locking mechanism is unlocked. The right end of the third rod is provided with a connecting plate extending horizontally to the right, and the locking pin is pluggable and penetrates the connecting plate. The upper end surface of the locking pin is flush with the highest point of the third rod.

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

[0027] The seat assembly includes a first rod, a second rod, a third rod and a fourth rod extending in the left-right direction, the first rod and the second rod are located in the same vertical plane, the third rod and the fourth rod are located in the same vertical plane, the left end of the first rod is rotatably connected to the front end of the seat stay of the left side bracket, the right end of the first rod is rotatably connected to the left end of the second rod, the right end of the second rod is rotatably connected to the front end of the seat stay of the right side bracket, the left end of the third rod is rotatably connected to the rear end of the seat stay of the left side bracket, the right end of the third rod is rotatably connected to the left end of the fourth rod, and the right end of the fourth rod is rotatably connected to the rear end of the seat stay of the right side bracket. The fourth rod and the seat support rods on both sides constitute a first six-link mechanism; by making the seat assembly further include a first link and a second link that cross in an X shape, the front end of the first link is rotatably connected to the middle part of the first rod, the rear end of the first link is rotatably connected to the middle part of the fourth rod, the front end of the second link is rotatably connected to the middle part of the second rod, and the rear end of the second link is rotatably connected to the middle part of the third rod; when the locking mechanism is unlocked, the side brackets on both sides can be moved closer to each other in the left and right directions, so that the first link and the second link drive the first six-link mechanism to move, thereby realizing the left and right folding of the foldable wheelchair. The structure is novel, and since the rods of the seat assembly are relatively short, the foldable wheelchair occupies less space after folding. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] FIG1 is a perspective schematic diagram of a preferred embodiment of the present invention, in which the foldable wheelchair is in an unfolded state.

[0029] FIG. 2 is a schematic top view of FIG. 1 .

[0030] FIG3 is a schematic diagram of an intermediate state during the process of the foldable wheelchair in FIG2 being transformed into a folded state.

[0031] FIG4 is a schematic diagram of the foldable wheelchair in FIG2 after being transformed into a folded state.

[0032] Among them: 10. Side bracket; 11. Bottom support rod; 12. Seat support rod; 13. Rear vertical rod; 131. Push handle; 14. Front connecting rod; 15. Handrail rod; 21. Front wheel assembly; 22. Rear wheel assembly; 30. Seat assembly; 31. First rod; 32. Second rod; 33. Third rod; 331. Connecting plate; 34. Fourth rod; 35. First connecting rod; 36. Second connecting rod; 37. Fifth rod; 38. Sixth rod; 39. Seventh rod; 40. Eighth rod; 41. First vertical rod; 42. Second vertical rod; 43. Third vertical rod; 44. Fourth vertical rod; 51. Locking pin. DETAILED DESCRIPTION

[0033] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art.

[0034] The front-back, top-bottom, left-right directions described in the present invention are the front-back, top-bottom, left-right directions observed by the user when riding.

[0035] As shown in Figures 1 to 4, the left-right foldable wheelchair provided by the present invention includes two side supports 10 provided on the left and right sides, a wheel assembly connected to the bottom of the side supports 10, a seat assembly 30 provided between the two side supports 10, and a locking mechanism for locking the foldable wheelchair in the unfolded state. The side supports 10 include a bottom support rod 11 extending in the horizontal direction, a seat support rod 12 provided parallel to and above the bottom support rod 11, and a rear upright rod connected to the rear ends of the bottom support rod 11 and the seat support rod 12 and extending in the vertical direction. Rod 13, and the front connecting rod 14 connecting the bottom support rod 11 and the front end of the seat support rod 12, the wheel assembly includes a front wheel assembly 21 connected to the bottom of the front connecting rod 14 and a rear wheel assembly 22 connected to the bottom of the rear upright rod 13; the seat assembly 30 includes a first rod 31, a second rod 32, a third rod 33 and a fourth rod 34 extending in the left and right directions, the first rod 31 and the second rod 32 are located in the same vertical plane and have the same length, the third rod 33 and the fourth rod 34 are located in the same vertical plane and have the same length, the left end of the first rod 31 is connected to the left side bracket The front end of the seat stay 12 of the right side bracket 10 is rotatably connected, the right end of the first rod 31 is rotatably connected to the left end of the second rod 32, the right end of the second rod 32 is rotatably connected to the front end of the seat stay 12 of the right side bracket 10, the left end of the third rod 33 is rotatably connected to the rear end of the seat stay 12 of the left side bracket 10, the right end of the third rod 33 is rotatably connected to the left end of the fourth rod 34, and the right end of the fourth rod 34 is rotatably connected to the rear end of the seat stay 12 of the right side bracket 10, so that the first rod 31 and the second rod 31 are rotatably connected. The rod 32, the third rod 33, the fourth rod 34 and the seat stays 12 on both sides constitute a first six-link mechanism; the seat assembly 30 also includes a first link 35 and a second link 36 that are X-shaped (the projection in the vertical direction is X-shaped), the front end of the first link 35 is rotatably connected to the middle of the first rod 31, the rear end of the first link 35 is rotatably connected to the middle of the fourth rod 34, the front end of the second link 36 is rotatably connected to the middle of the second rod 32, and the rear end of the second link 36 is rotatably connected to the middle of the third rod 33.

[0036] The advantage of such an arrangement is that when the locking mechanism is unlocked, the side brackets on both sides can be brought closer to each other in the left-right direction, so that the first link and the second link drive the first six-link mechanism to operate, thereby realizing the left-right folding of the foldable wheelchair. The structure is novel. Since the rods (first rod, second rod, third rod, fourth rod) of the seat assembly are relatively short, the space occupied by the foldable wheelchair after folding is smaller. At the same time, the first link and the second link can also play a role of auxiliary support for the seat under the seat.

[0037] In order to improve the rigidity of the foldable wheelchair when it is unfolded and enhance the supporting force of the seat assembly, the first rod 31 and the second rod 32 are staggered in the vertical direction, and the third rod 33 and the fourth rod 34 are staggered in the vertical direction. The first rod 31 and the fourth rod 34 are located in the same horizontal plane, and the second rod 32 and the third rod 33 are located in the same horizontal plane. Furthermore, the second connecting rod 36 is located in the same horizontal plane as the first rod 31 and the fourth rod 34 to enhance the fit and save space.

[0038] In order to further improve the rigidity of the foldable wheelchair when unfolded, in this embodiment, the seat assembly 30 further includes a fifth rod 37, a sixth rod 38, a seventh rod 39 and an eighth rod 40 extending in the left and right directions. The fifth rod 37 is located directly below the first rod 31 and is of equal length to the first rod 31. The sixth rod 38 is located directly below the second rod 32 and is of equal length to the second rod 32. The left end of the fifth rod 37 is rotatably connected to the front end of the bottom support rod 11 of the left side bracket 10, the right end of the fifth rod 37 is rotatably connected to the left end of the sixth rod 38, and the right end of the sixth rod 38 is rotatably connected to the front end of the bottom support rod 11 of the right side bracket 10; the seventh rod 39 is located directly below the third rod 33 and is of equal length to the third rod 33. The eighth rod 40 is located directly below the third rod 33 and is of equal length to the third rod 33. 0 is located directly below the fourth rod 34 and is of the same length as the fourth rod 34, the left end portion of the seventh rod 39 is rotatably connected to the rear end portion of the bottom support rod 11 of the left side bracket 10, the right end portion of the eighth rod 40 is rotatably connected to the left end portion of the seventh rod 39, and the right end portion of the eighth rod 40 is rotatably connected to the rear end portion of the bottom support rod 11 of the right side bracket 10, so that the fifth rod 37, the sixth rod 38, the seventh rod 39, the eighth rod 40 and the bottom support rods 11 on both sides constitute a second six-bar linkage; specifically, the fifth rod 37 and the sixth rod 38 are staggered in the vertical direction, the seventh rod 39 and the eighth rod 40 are staggered in the vertical direction, the fifth rod 37 and the eighth rod 40 are located in the same horizontal plane, and the sixth rod 38 and the seventh rod 39 are located in the same horizontal plane.

[0039] Furthermore, the seat assembly 30 also includes a first vertical rod 41, a second vertical rod 42, a third vertical rod 43 and a fourth vertical rod 44. The two ends of the first vertical rod 41 are respectively connected to the first rod 31 and the fifth rod 37, the two ends of the second vertical rod 42 are respectively connected to the second rod 32 and the sixth rod 38, the two ends of the third vertical rod 43 are respectively connected to the third rod 33 and the seventh rod 39, and the two ends of the fourth vertical rod 44 are respectively connected to the fourth rod 34 and the eighth rod 40, so that the first six-bar linkage and the second six-bar linkage are interconnected to form a stable support frame; at the same time, the first vertical rod 41 and the third vertical rod 43 are arranged close to the side bracket 10 on the left, and the second vertical rod 42 and the fourth vertical rod 44 are arranged close to the side bracket 10 on the right.

[0040] In this embodiment, the locking mechanism includes a locking pin 51 that is pluggably arranged at the right end of the third rod 33. The locking pin 51 is located above the fourth rod 34 and corresponds to a locking hole (not shown in the figure) set at the left end of the fourth rod 34. When the locking pin 51 is inserted into the locking hole, the locking mechanism is locked. When the locking pin 51 is disengaged from the locking hole, the locking mechanism is unlocked.

[0041] Furthermore, a connecting plate 331 extending horizontally to the right is provided at the right end of the third rod 33 , and a locking pin 51 is pluggably inserted into the connecting plate 331 , with the upper end surface of the locking pin 51 flush with the highest point of the third rod 33 .

[0042] In order to improve the comfort during use, in this embodiment, the upper end of the rear upright 13 extends obliquely upward and rearward to form a push handle 131. The side bracket 10 also includes a handrail 15. The front end of the handrail 15 extends forward and downward and is connected to the front end of the seat support rod 12. The rear end of the handrail 15 extends backward and is connected to the middle part of the rear upright 13.

[0043] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable people familiar with this technology to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A foldable wheelchair, comprising two side supports disposed on left and right sides, and a seat assembly disposed between the two side supports, wherein the side supports include a bottom support rod extending horizontally, a seat support rod disposed parallel to and above the bottom support rod, a rear upright rod connected to rear ends of the bottom support rod and the seat support rod and extending vertically, and a front connecting rod connecting the bottom support rod and the front end of the seat support rod; Its characteristics are: The seat assembly includes a first rod, a second rod, a third rod, and a fourth rod extending in the left-right direction, wherein the left end of the first rod is rotatably connected to the front end of the seat stay of the left side bracket, the right end of the second rod is rotatably connected to the front end of the seat stay of the right side bracket, the left end of the third rod is rotatably connected to the rear end of the seat stay of the left side bracket, and the right end of the fourth rod is rotatably connected to the rear end of the seat stay of the right side bracket; the right end of the first rod is rotatably connected to the left end of the second rod, and the right end of the third rod is rotatably connected to the left end of the fourth rod, so that the first rod, the second rod, the third rod, the fourth rod, and the seat stays on both sides form a first six-bar linkage; The seat assembly also includes a first link and a second link that cross in an X shape, the front end of the first link being rotatably connected to the middle of the first rod, the rear end of the first link being rotatably connected to the middle of the fourth rod, the front end of the second link being rotatably connected to the middle of the second rod, and the rear end of the second link being rotatably connected to the middle of the third rod. When the side brackets on both sides approach each other in the left and right directions, the first six-link mechanism can be driven by the first link and the second link to achieve left and right folding of the foldable wheelchair.

2. The left-right foldable wheelchair according to claim 1, characterized in that: The first rod and the second rod are located in the same vertical plane, and the third rod and the fourth rod are located in the same vertical plane.

3. The left-right foldable wheelchair according to claim 1, characterized in that: The first rod and the second rod are staggered in the vertical direction, the third rod and the fourth rod are staggered in the vertical direction, the first rod and the fourth rod are located in the same horizontal plane, and the second rod and the third rod are located in the same horizontal plane.

4. The left-right foldable wheelchair according to claim 2, characterized in that: The second connecting rod, the first rod and the fourth rod are located on the same horizontal plane.

5. The left-right foldable wheelchair according to claim 1, characterized in that: The foldable wheelchair further includes a locking mechanism for locking it in the unfolded state, the locking mechanism including a locking hole and a locking pin, the locking hole being provided at the left end portion of the fourth rod, the locking pin being pluggable and provided at the right end portion of the third rod and corresponding to the locking hole, the locking mechanism being locked when the locking pin is inserted into the locking hole, and being unlocked when the locking pin is disengaged from the locking hole.

6. The left-right foldable wheelchair according to claim 5, characterized in that: The locking pin is located above the fourth rod.

7. The left-right foldable wheelchair according to claim 5, characterized in that: The right end of the third rod is provided with a connecting plate extending horizontally to the right, and the locking pin is inserted and removed from the connecting plate, and the upper end surface of the locking pin is flush with the highest point of the third rod.

8. The left-right foldable wheelchair according to claim 1, characterized in that: The seat assembly also includes a fifth rod, a sixth rod, a seventh rod and an eighth rod extending in the left-right direction, the left end of the fifth rod being rotatably connected to the front end of the bottom support rod of the left side bracket, the right end of the sixth rod being rotatably connected to the front end of the bottom support rod of the right side bracket, the left end of the seventh rod being rotatably connected to the rear end of the bottom support rod of the left side bracket, and the right end of the eighth rod being rotatably connected to the rear end of the bottom support rod of the right side bracket; the right end of the fifth rod being rotatably connected to the left end of the sixth rod, and the right end of the eighth rod being rotatably connected to the left end of the seventh rod, so that the fifth rod, the sixth rod, the seventh rod, the eighth rod and the bottom support rods on both sides constitute a second six-bar linkage.

9. The left-right foldable wheelchair according to claim 8, characterized in that: The fifth rod is located directly below the first rod, the sixth rod is located directly below the second rod, the seventh rod is located directly below the third rod, and the eighth rod is located directly below the fourth rod.

10. The left-right foldable wheelchair according to claim 8, characterized in that: The fifth rod and the sixth rod are staggered in the vertical direction, the seventh rod and the eighth rod are staggered in the vertical direction, the fifth rod and the eighth rod are located in the same horizontal plane, and the sixth rod and the seventh rod are located in the same horizontal plane.

11. The left-right foldable wheelchair according to claim 8, characterized in that: The seat assembly further includes a first vertical rod, a second vertical rod, a third vertical rod and a fourth vertical rod, wherein both ends of the first vertical rod are respectively connected to the first rod and the fifth rod, both ends of the second vertical rod are respectively connected to the second rod and the sixth rod, both ends of the third vertical rod are respectively connected to the third rod and the seventh rod, and both ends of the fourth vertical rod are respectively connected to the fourth rod and the eighth rod, so that the first six-bar linkage mechanism and the second six-bar linkage mechanism are interconnected to form a stable support frame.

12. The left-right foldable wheelchair according to claim 11, characterized in that: The first vertical rod and the third vertical rod are arranged close to the side bracket on the left side, and the second vertical rod and the fourth vertical rod are arranged close to the side bracket on the right side.

13. The left-right foldable wheelchair according to claim 1, characterized in that: The upper end portion of the rear upright rod extends obliquely rearward and upward to form a push handle portion.

14. The left-right foldable wheelchair according to claim 1, characterized in that: The side bracket further comprises a handrail, the front end of which extends forward and downward and is connected to the front end of the seat support rod, and the rear end of which extends rearward and is connected to the middle portion of the rear upright rod. The foldable wheelchair of claim 1, wherein the front end of the handrail extends downwardly and is connected to the front end of the seat support, the rear end of the handrail extends backwardly and is connected to the middle portion of the rear upright. The wheelchair of claim 1, wherein the front end of the handrail extends downwardly and is connected to the front end of the seat support, the rear end of the handrail extends backwardly and is connected to the middle portion of the rear upright. The wheelchair of claim 1, wherein the front end of the handrail extends downwardly and is connected to the front end of the seat support, the rear end of the handrail extends backwardly and is connected to the middle portion of the rear upright. Its characteristics are: The seat assembly includes a first rod, a second rod, a third rod, and a fourth rod extending in the left-right direction, the first rod and the second rod being located in the same vertical plane, the third rod and the fourth rod being located in the same vertical plane, the left end of the first rod being rotatably connected to the front end of the seat stay of the left side bracket, the right end of the first rod being rotatably connected to the left end of the second rod, the right end of the second rod being rotatably connected to the front end of the seat stay of the right side bracket, the left end of the third rod being rotatably connected to the rear end of the seat stay of the left side bracket, the right end of the third rod being rotatably connected to the left end of the fourth rod, and the right end of the fourth rod being rotatably connected to the rear end of the seat stay of the right side bracket, so that the first rod, the second rod, the third rod, the fourth rod, and the seat stays on both sides constitute a first six-bar linkage mechanism, the first rod and the second rod being staggered in the vertical direction, the third rod and the fourth rod being staggered in the vertical direction, the first rod and the fourth rod being located in the same horizontal plane, and the second rod and the third rod being located in the same horizontal plane; The seat assembly further includes a fifth rod, a sixth rod, a seventh rod and an eighth rod extending in the left-right direction, the fifth rod being located directly below the first rod, the sixth rod being located directly below the second rod, the left end portion of the fifth rod being rotatably connected to the front end portion of the bottom support rod of the left side bracket, the right end portion of the fifth rod being rotatably connected to the left end portion of the sixth rod, and the right end portion of the sixth rod being rotatably connected to the front end portion of the bottom support rod of the right side bracket; the seventh rod being located directly below the third rod, the eighth rod being located directly below the fourth rod, the left end portion of the seventh rod being rotatably connected to the left The rear end of the bottom support rod of the side bracket is rotatably connected, the right end of the eighth rod is rotatably connected to the left end of the seventh rod, and the right end of the eighth rod is rotatably connected to the rear end of the bottom support rod of the right side bracket, so that the fifth rod, the sixth rod, the seventh rod, the eighth rod and the bottom support rods on both sides constitute a second six-bar linkage mechanism, the fifth rod and the sixth rod are staggered in the vertical direction, the seventh rod and the eighth rod are staggered in the vertical direction, the fifth rod and the eighth rod are located in the same horizontal plane, and the sixth rod and the seventh rod are located in the same horizontal plane; The seat assembly further includes a first vertical rod, a second vertical rod, a third vertical rod, and a fourth vertical rod, wherein both ends of the first vertical rod are connected to the first rod and the fifth rod respectively, both ends of the second vertical rod are connected to the second rod and the sixth rod respectively, both ends of the third vertical rod are connected to the third rod and the seventh rod respectively, and both ends of the fourth vertical rod are connected to the fourth rod and the eighth rod respectively, so that the first six-bar linkage mechanism and the second six-bar linkage mechanism are interconnected to form a stable support frame; the first vertical rod and the third vertical rod are arranged near the left side bracket, and the second vertical rod and the fourth vertical rod are arranged near the right side bracket; The seat assembly further includes a first connecting rod and a second connecting rod intersecting in an X shape, wherein the front end of the first connecting rod is rotatably connected to the middle portion of the first rod, the rear end of the first connecting rod is rotatably connected to the middle portion of the fourth rod, the front end of the second connecting rod is rotatably connected to the middle portion of the second rod, and the rear end of the second connecting rod is rotatably connected to the middle portion of the third rod; the second connecting rod is located on the same horizontal plane as the first rod and the fourth rod; The locking mechanism includes a locking pin that is pluggable and arranged at the right end of the third rod. The locking pin is located above the fourth rod and corresponds to the locking hole set at the left end of the fourth rod. When the locking pin is inserted into the locking hole, the locking mechanism is locked; when the locking pin is disengaged from the locking hole, the locking mechanism is unlocked. The right end of the third rod is provided with a connecting plate extending horizontally to the right, and the locking pin is pluggable and penetrates the connecting plate. The upper end surface of the locking pin is flush with the highest point of the third rod.

Images