Foldable wheelchair

Abstract

A foldable wheelchair, comprising a wheelchair frame (10) having an unfolded state and a folded state, a wheel assembly arranged at the bottom of the wheelchair frame (10), and a locking mechanism for locking the wheelchair frame (10) in an unfolded state. The wheelchair frame (10) comprises a backrest support (11), a seat support (12) having a rear end rotatably connected to the middle of the backrest support (11), a front wheel support (13) having an upper end rotatably connected to a lower end of the backrest support (11), and a rear wheel support (14) having an upper end rotatably connected to a front end of the seat support (12); the wheel assembly comprises a front wheel assembly (21) connected to the bottom of the front wheel support (13) and a rear wheel assembly (22) connected to the bottom of the rear wheel support (14); and the front wheel support (13) and the rear wheel support (14) intersect below the seat support (12) in an X shape, a sliding sleeve (15) is provided at the intersection of the front wheel support (13) and the rear wheel support (14), the sliding sleeve (15) is slidably sleeved on the front wheel support (13) and is rotatably connected to the rear wheel support (14), and the direction of sliding of the sliding sleeve (15) is parallel to the plane in which the sliding sleeve (15) rotates, such that the front wheel support (13), the rear wheel support (14), the backrest support (11) and the seat support (12) forms a four-bar linkage with a slider mechanism to achieve linkage. Thus, the wheelchair frame (10) can be unfolded or folded by moving the backrest support (11) and the seat support (12) away from or closer to each other. When folded, the front wheel assembly (21) and the rear wheel assembly (22) move closer to each other to a small extent, resulting in a low overall height of the foldable wheelchair after folding.

Description

A foldable wheelchair Technical Field

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

[0002] Wheelchairs are medical devices that assist patients in treatment and rehabilitation. To facilitate storage, foldable wheelchairs have appeared on the market. Existing foldable wheelchairs are mostly folded by lowering the seat height and folding the front and rear wheels. This method makes the overall height of the folded wheelchair higher, and when loaded into containers for transportation, it occupies a large space, resulting in low utilization of the container space. Summary of the Invention

[0003] The purpose of the present invention is to overcome one or more shortcomings of the prior art and to provide a foldable wheelchair which has a low overall height after folding and is easy to improve the utilization rate of container space.

[0004] To achieve the above-mentioned object, the technical solution adopted by the present invention is a foldable wheelchair, comprising a wheelchair frame having an unfolded state and a folded state, a wheel assembly provided at the bottom of the wheelchair frame, and a locking mechanism for locking the wheelchair frame in the unfolded state, the wheelchair frame comprising a backrest frame, a seat frame having a rear end rotatably connected to a middle portion of the backrest frame, a front wheel frame having an upper end rotatably connected to a lower end portion of the backrest frame, and a rear wheel frame having an upper end rotatably connected to a front end portion of the seat frame;

[0005] The front wheel bracket and the rear wheel bracket are arranged in an X-shape below the seat bracket, and a sliding sleeve is provided at the intersection of the front wheel bracket and the rear wheel bracket. The sliding sleeve can be slidably mounted on one of the front wheel bracket and the rear wheel bracket and is rotatably connected to the other. The sliding direction of the sliding sleeve is parallel to the rotation plane of the sliding sleeve.

[0006] Preferably, the front wheel support is located outside the rear wheel support.

[0007] Preferably, the sliding sleeve is slidably mounted on the front wheel bracket and is rotatably connected to the rear wheel bracket.

[0008] Further preferably, the sliding sleeve has a tubular portion sleeved on the front wheel bracket, and a boss vertically connected to the tubular portion and protruding inward, and one end of the boss away from the tubular portion is rotatably connected to the middle part of the rear wheel bracket.

[0009] Preferably, the wheelchair frame further comprises a bottom support rod, the lower end of which is rotatably connected to the lower end of the rear wheel bracket, and the upper end of which extends obliquely rearward and upward and is rotatably connected to the lower end of the backrest bracket.

[0010] Further preferably, the upper end portion of the bottom support rod, the upper end portion of the front wheel bracket, and the lower end portion of the backrest bracket are rotatably connected via a first rotation shaft.

[0011] Further preferably, the upper end of the front wheel bracket is provided with a first cross beam, the middle part of the first cross beam is provided with a first ear plate extending rearward and upward, the lower end of the backrest bracket is provided with a second cross beam, the second cross beam is provided with a second ear plate extending forward and downward, the upper end of the bottom support rod is provided with a third cross beam, the middle part of the third cross beam is provided with a pivot support, and the pivot support is rotatably connected to the first ear plate and the second ear plate through the first rotating shaft.

[0012] Further preferably, the extension direction of the first ear plate coincides with the extension direction of the front wheel bracket, and there are two first ear plates disposed on both sides of the rotating shaft support.

[0013] Further preferably, the angle between the extension direction of the second ear plate and the extension direction of the backrest bracket is an obtuse angle, and there are two second ear plates and they are arranged on both sides of the rotating shaft support.

[0014] Preferably, the wheelchair frame also includes an armrest assembly, which includes an armrest rod and an armrest support rod. The front end of the armrest rod extends forward, the rear end of the armrest rod is rotatably connected to the middle part of the backrest bracket, the upper end of the armrest support rod is rotatably connected to the front end of the armrest rod, and the lower end of the armrest support rod is rotatably connected to the rear end of the seat bracket, so that the seat bracket, the backrest bracket, the armrest rod and the armrest support rod constitute a four-bar linkage.

[0015] Further preferably, a supporting rib parallel to the handrail rod is provided at the bottom of the handrail rod, and the upper end portion of the handrail support rod is rotatably connected to the supporting rib via a second rotating shaft.

[0016] Further preferably, the support rib is further provided with a slide groove extending in a direction parallel to the handrail rod, and the second rotating shaft is slidably and rotatably arranged on the first slide groove.

[0017] Further preferably, the armrest assembly further includes a locking member, and when the locking member is locked, the second rotating shaft can only rotate relative to the sliding groove.

[0018] Preferably, the wheel assembly includes a front wheel assembly connected to the bottom of the front wheel bracket and a rear wheel assembly connected to the bottom of the rear wheel bracket.

[0019] Further preferably, the foldable wheelchair is an electric wheelchair, and the foldable wheelchair further comprises a drive motor arranged on the rear wheel assembly and a power box arranged on the rear wheel bracket.

[0020] The technical solution adopted by the present invention is a foldable wheelchair, comprising a wheelchair frame having an unfolded state and a folded state, a wheel assembly provided at the bottom of the wheelchair frame, and a locking mechanism for locking the wheelchair frame in the unfolded state, the wheelchair frame comprising a backrest frame, a seat frame having a rear end rotatably connected to a middle portion of the backrest frame, a front wheel frame having an upper end rotatably connected to a lower end portion of the backrest frame, and a rear wheel frame having an upper end rotatably connected to a front end portion of the seat frame;

[0021] The front wheel bracket and the rear wheel bracket are arranged below the seat bracket in an X-shaped intersection, the front wheel bracket is located on the outside of the rear wheel bracket, and a sliding sleeve is provided at the intersection of the front wheel bracket and the rear wheel bracket. The sliding sleeve is slidably mounted on the front wheel bracket and is rotatably connected to the rear wheel bracket. The sliding sleeve has a tubular portion mounted on the front wheel bracket and a boss perpendicularly connected to the tubular portion and protruding inwardly. The end of the boss away from the tubular portion is rotatably connected to the middle part of the rear wheel bracket, and the sliding direction of the sliding sleeve is parallel to the rotation plane of the sliding sleeve.

[0022] The wheelchair frame further includes a bottom support rod, the lower end of the bottom support rod being rotatably connected to the lower end of the rear wheel bracket, the upper end of the bottom support rod extending obliquely rearward and upward and being rotatably connected to the lower end of the backrest bracket, and the upper end of the bottom support rod, the upper end of the front wheel bracket, and the lower end of the backrest bracket being rotatably connected via a first rotation axis;

[0023] The upper end portion of the front wheel bracket is provided with a first cross beam, the middle portion of the first cross beam is provided with a first ear plate extending rearward and upward, the lower end portion of the backrest bracket is provided with a second cross beam, the second cross beam is provided with a second ear plate extending forward and downward, the upper end portion of the bottom support rod is provided with a third cross beam, the middle portion of the third cross beam is provided with a rotating shaft support, the rotating shaft support is rotatably connected to the first ear plate and the second ear plate via the first rotating shaft; the extension direction of the first ear plate coincides with the extension direction of the front wheel bracket, there are two first ear plates and they are arranged on both sides of the rotating shaft support; the angle between the extension direction of the second ear plate and the extension direction of the backrest bracket is an obtuse angle, there are two second ear plates and they are arranged on both sides of the rotating shaft support;

[0024] The wheelchair frame further comprises an armrest assembly, the armrest assembly comprising an armrest rod, an armrest support rod, and a locking member, the front end portion of the armrest rod extending forward, the rear end portion of the armrest rod being rotatably connected to the middle portion of the backrest bracket, the upper end portion of the armrest support rod being rotatably connected to the front end portion of the armrest rod, and the lower end portion of the armrest support rod being rotatably connected to the rear end portion of the seat bracket, so that the seat bracket, the backrest bracket, the armrest rod and the armrest support rod form a four-bar linkage; the bottom of the armrest rod is provided with a supporting rib parallel to the armrest rod, the upper end portion of the armrest support rod is rotatably connected to the supporting rib by a second rotating shaft, and the supporting rib is also provided with a sliding groove extending in a direction parallel to the armrest rod, the second rotating shaft being slidably and rotatably inserted into the first sliding groove; when the locking member is locked, the second rotating shaft can only rotate relative to the sliding groove;

[0025] The wheel assembly includes a front wheel assembly connected to the bottom of the front wheel bracket and a rear wheel assembly connected to the bottom of the rear wheel bracket. The foldable wheelchair is an electric wheelchair. The foldable wheelchair also includes a drive motor arranged on the rear wheel assembly and a power box arranged on the rear wheel bracket.

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

[0027] The foldable wheelchair provided by the present invention is arranged below the seat frame in an X-shaped cross-arrangement of the front wheel bracket and the rear wheel bracket, and a sliding sleeve is provided at the intersection of the front wheel bracket and the rear wheel bracket, so that the sliding sleeve can be slidably mounted on one of the front wheel bracket and the rear wheel bracket and is rotatably connected to the other, so that the sliding direction of the sliding sleeve is parallel to the rotation plane of the sliding sleeve. A four-bar plus slider mechanism formed by the front wheel bracket, the rear wheel bracket, the backrest bracket and the seat bracket can be used to form a linkage to realize the expansion and folding of the wheelchair frame. When folding, the front and rear wheel assemblies are close to each other to a small extent, so that the overall height of the foldable wheelchair after folding is low, usually not exceeding 42.5 cm, which can greatly reduce the space occupied by the foldable wheelchair, thereby improving the utilization rate of the container space and reducing transportation costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] FIG1 is a schematic left side view of a preferred embodiment of the present invention, wherein the wheelchair frame is in an unfolded state.

[0029] FIG2 is a schematic left view of a preferred embodiment of the present invention, wherein the wheelchair frame is in an intermediate state during the transformation from the unfolded state to the folded state.

[0030] FIG3 is a schematic left view of a preferred embodiment of the present invention, in which the wheelchair frame is in a folded state.

[0031] FIG4 is a perspective schematic diagram of FIG1 .

[0032] FIG5 is a perspective schematic diagram of FIG3 .

[0033] FIG. 6 is a three-dimensional schematic diagram of FIG. 4 after adjusting the viewing angle.

[0034] Among them: 10. Wheelchair frame; 11. Backrest bracket; 111. Second crossbeam; 112. Second ear plate; 12. Seat bracket; 13. Front wheel bracket; 131. First crossbeam; 132. First ear plate; 14. Rear wheel bracket; 141. Power box; 15. Sleeve; 151. Tubular portion; 152. Boss; 16. Bottom support rod; 161. Third crossbeam; 162. Pivot support; 17. First rotating shaft; 18. Armrest assembly; 181. Armrest rod; 182. Armrest support rod; 183. Support rib; 184. Second rotating shaft; 185. Slide; 186. Locking member; 21. Front wheel assembly; 22. Rear wheel assembly; 221. Drive motor. DETAILED DESCRIPTION

[0035] 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.

[0036] 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.

[0037] As shown in Figures 1 to 6, the foldable wheelchair provided by the present invention includes a wheelchair frame 10 with an unfolded state and a folded state, a wheel assembly provided at the bottom of the wheelchair frame 10, and a locking mechanism (not shown in the figures) for locking the wheelchair frame 10 in the unfolded state. The wheelchair frame 10 includes a backrest frame 11, a seat frame 12 whose rear end is rotatably connected to the middle part of the backrest frame 11, a front wheel frame 13 whose upper end is rotatably connected to the lower end of the backrest frame 11, and a rear wheel frame 14 whose upper end is rotatably connected to the ear plate of the front end part (bottom front part) of the seat frame 12; the wheel assembly includes a front wheel assembly 21 connected to the bottom of the front wheel frame 13 and a rear wheel assembly 22 connected to the bottom of the rear wheel frame 14; in this embodiment, the front wheel frame 13 and the rear wheel frame 14 are arranged below the seat frame 12 in an X-shaped cross. A sleeve 15 is provided at the intersection of the frame 13 and the rear wheel frame 14. The sleeve 15 is slidably mounted on the front wheel frame 13 and is rotatably connected to the rear wheel frame 14. The sliding direction of the sleeve 15 is parallel to the rotation plane of the sleeve 15 (the sliding direction of the sleeve 15 is perpendicular to the rotation axis of the sleeve 15), so that the four-bar plus slider mechanism formed by the front wheel frame 13, the rear wheel frame 14, the backrest frame 11 and the seat frame 12 forms a linkage, so that the wheelchair frame 10 is unfolded or folded by the backrest frame 11 and the seat frame 12 moving away from or close to each other. When folding, the front wheel assembly 21 and the rear wheel assembly 22 move closer to each other to a small extent, so that the overall height of the foldable wheelchair is low after folding, usually not exceeding 42.5 cm, which can greatly reduce the space it occupies, thereby improving the utilization rate of the container space and reducing transportation costs.

[0038] In order to improve the safety and aesthetics of the sliding sleeve 15 during sliding and rotating, in this embodiment, the front wheel bracket 13 is located on the outside of the rear wheel bracket 14 to achieve staggered folding, further reducing the total height after folding; further, the sliding sleeve 15 is in the shape of a three-way tube, and the sliding sleeve 15 has a tubular portion 151 that is sleeved on the front wheel bracket 13, and a boss 152 that is vertically connected to the tubular portion 151 and protrudes inward, and the end of the boss 152 away from the tubular portion 151 is rotatably connected to the middle part of the rear wheel bracket 14.

[0039] In this embodiment, the wheelchair frame 10 also includes a bottom support rod 16, the lower end of the bottom support rod 16 is rotatably connected to the lower end of the rear wheel bracket 14, and the upper end of the bottom support rod 16 extends obliquely backward and upward and is indirectly rotatably connected to the lower end of the backrest bracket 11. The advantage of this arrangement is that the bottom support rod 16, the rear wheel bracket 14, the sliding sleeve 15 and the front wheel bracket 13 can form a crank slider mechanism, which can not only improve the stability of the wheelchair frame 10 when it is in the unfolded state, but also reduce the degree of freedom of the four-bar plus slider mechanism formed by the front wheel bracket 13, the rear wheel bracket 14, the backrest bracket 11 and the seat bracket 12, so that the locking mechanism only needs to lock any two adjacent ones of the front wheel bracket 13, the rear wheel bracket 14, the backrest bracket 11 and the seat bracket 12, thereby greatly simplifying the structure of the locking mechanism. It should be noted that the specific structure of the locking mechanism can be implemented using existing technology and will not be repeated here.

[0040] Specifically, the upper end of the bottom support rod 16, the upper end of the front wheel bracket 13, and the lower end of the backrest bracket 11 are rotatably connected through the first rotating shaft 17. Furthermore, the upper end of the front wheel bracket 13 is provided with a first cross beam 131, and the middle part of the first cross beam 131 is provided with a first ear plate 132 extending rearward and upward. The lower end of the backrest bracket 11 is provided with a second cross beam 111, and the second cross beam 111 is provided with a second ear plate 112 extending forward and downward. The upper end of the bottom support rod 16 is provided with a third cross beam 161, and the middle part of the third cross beam 161 is provided with a rotating shaft support 162. The rotating shaft support 162 is rotatably connected to the first ear plate 132 and the second ear plate 112 through the first rotating shaft 17.

[0041] Furthermore, the extension direction of the first ear plate 132 coincides with the extension direction of the front wheel bracket 13, and there are two first ear plates 132 and they are arranged on the left and right sides of the shaft support 162. At the same time, the angle between the extension direction of the second ear plate 112 and the extension direction of the backrest bracket 11 is an obtuse angle, and there are two second ear plates 112 and they are arranged on the left and right sides of the shaft support 162, and the second ear plate 112 is located on the inner side of the first ear plate 132.

[0042] In order to improve riding comfort, in this embodiment, the wheelchair frame 10 also includes an armrest assembly 18, which includes an armrest rod 181 and an armrest strut 182. The front end of the armrest rod 181 extends forward, and the rear end of the armrest rod 182 is rotatably connected to the middle part of the backrest bracket 11. The upper end of the armrest strut 182 is rotatably connected to the front end of the armrest rod 181, and the lower end of the armrest strut 182 is rotatably connected to the rear end of the seat bracket 12, so that the seat bracket 12, the backrest bracket 11, the armrest rod 181 and the armrest strut 182 form a four-bar linkage mechanism. This arrangement can also enable the armrest assembly 18 to be linked with the four-bar linkage plus slider mechanism formed by the front wheel bracket 13, the rear wheel bracket 14, the backrest bracket 11 and the seat bracket 12, so that when the wheelchair frame 10 is unfolded or folded, the armrest assembly 18 can be unfolded or folded accordingly.

[0043] In this embodiment, a support rib 183 parallel to the armrest rod 181 is provided at the bottom of the armrest rod 181, and the upper end of the armrest strut 182 is rotatably connected to the support rib 183 via a second rotating shaft 184. Furthermore, a slide groove 185 extending in a direction parallel to the armrest rod 181 is provided on the support rib 183, and the second rotating shaft 184 is slidably and rotatably passed through the first slide groove 185. The advantage of such a setting is that, under the premise that the locking mechanism is in a locked state, the height of the armrest rod 181 can be raised according to demand, or the armrest rod 181 can be opened upward to expose the lateral entry and exit passage of the foldable wheelchair.

[0044] Furthermore, the armrest assembly 18 also includes a locking member 186. When the locking member 186 is locked, the second rotating shaft 184 can only rotate relative to the slide groove 185. The locking member 186 can be implemented using existing technology. For example, the locking member 186 is a threaded connection member with a boss that is sleeved on the second rotating shaft 184 and located on one side or both sides of the support rib 183. When the threaded connection member is locked, the boss presses against the support rib 183, so that the second rotating shaft 184 can only rotate relative to the slide groove 185 and cannot move along the slide groove 185.

[0045] In this embodiment, in order to improve convenience, the foldable wheelchair is an electric wheelchair, and the foldable wheelchair further includes a drive motor 221 arranged on the rear wheel assembly 22 and a power box 141 arranged on the rear wheel bracket 14.

[0046] 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 a wheelchair frame having a deployed state and a folded state, a wheel assembly provided at the bottom of the wheelchair frame, and a locking mechanism for locking the wheelchair frame in the deployed state. The wheelchair frame includes a backrest bracket, a seat bracket whose rear end is rotatably connected to the middle of the backrest bracket, a front wheel bracket whose upper end is rotatably connected to the lower end of the backrest bracket, and a rear wheel bracket whose upper end is rotatably connected to the front end of the seat bracket; It is characterized in that: The front wheel bracket and the rear wheel bracket are arranged in an X-shaped cross under the seat bracket. A sliding sleeve is provided at the cross portion of the front wheel bracket and the rear wheel bracket. The sliding sleeve is slidably sleeved on one of the front wheel bracket and the rear wheel bracket and is rotatably connected to the other. The sliding direction of the sliding sleeve is parallel to the rotation plane of the sliding sleeve.

2. The foldable wheelchair according to claim 1, wherein: The front wheel bracket is located outside the rear wheel bracket.

3. The foldable wheelchair according to claim 1, characterized in that: The sliding sleeve is slidably sleeved on the front wheel bracket and is rotatably connected to the rear wheel bracket.

4. The foldable wheelchair according to claim 3, wherein: The sliding sleeve has a tubular portion sleeved on the front wheel bracket, and a boss vertically connected to the tubular portion and protruding inward. One end of the boss away from the tubular portion is rotatably connected to the middle of the rear wheel bracket.

5. The foldable wheelchair according to claim 1, characterized in that: The wheelchair frame further includes a bottom strut. The lower end of the bottom strut is rotatably connected to the lower end of the rear wheel bracket. The upper end of the bottom strut extends obliquely backward and upward and is rotatably connected to the lower end of the backrest bracket.

6. The foldable wheelchair according to claim 5, wherein: The upper end of the bottom strut, the upper end of the front wheel bracket, and the lower end of the backrest bracket are rotatably connected by a first rotating shaft.

7. The foldable wheelchair according to claim 6, characterized in that: A first cross beam is provided at the upper end of the front wheel bracket. A first ear plate extending backward and upward is provided in the middle of the first cross beam. A second cross beam is provided at the lower end of the backrest bracket. A second ear plate extending forward and downward is provided on the second cross beam. A third cross beam is provided at the upper end of the bottom strut. A rotating shaft support is provided in the middle of the third cross beam. The rotating shaft support is rotatably connected to the first ear plate and the second ear plate by the first rotating shaft.

8. The foldable wheelchair according to claim 7, characterized in that: The extending direction of the first ear plate coincides with the extending direction of the front wheel bracket. There are two first ear plates provided on both sides of the rotating shaft support.

9. The foldable wheelchair according to claim 7, wherein: The included angle between the extending direction of the second ear plate and the extending direction of the backrest bracket is an obtuse angle. There are two second ear plates provided on both sides of the rotating shaft support.

10. The foldable wheelchair according to claim 1, characterized in that: The wheelchair frame further includes an armrest assembly. The armrest assembly includes an armrest rod and an armrest strut. The front end of the armrest rod extends forward. The rear end of the armrest rod is rotatably connected to the middle of the backrest bracket. The upper end of the armrest strut is rotatably connected to the front end of the armrest rod. The lower end of the armrest strut is rotatably connected to the rear end of the seat bracket, so that the seat bracket, the backrest bracket, the armrest rod, and the armrest strut form a four-bar linkage mechanism.

11. The foldable wheelchair according to claim 10, wherein: A support rib parallel to the armrest rod is provided at the bottom of the armrest rod. The upper end of the armrest strut is rotatably connected to the support rib by a second rotating shaft.

12. The foldable wheelchair according to claim 11, wherein: The support rib plate is further provided with a chute extending in a direction parallel to the handrail rod, and the second rotating shaft is slidably and rotatably arranged on the first chute.

13. The foldable wheelchair according to claim 12, wherein: The handrail assembly further includes a locking member. When the locking member is locked, the second rotating shaft can only rotate relative to the chute.

14. The foldable wheelchair according to claim 1, wherein: The wheel assembly includes a front wheel assembly connected to the bottom of the front wheel bracket and a rear wheel assembly connected to the bottom of the rear wheel bracket.

15. The foldable wheelchair according to claim 14, wherein: The foldable wheelchair is an electric wheelchair, and the foldable wheelchair further includes a drive motor arranged on the rear wheel assembly and a power supply box arranged on the rear wheel bracket.

16. A foldable wheelchair, comprising a wheelchair frame having a deployed state and a folded state, a wheel assembly provided at the bottom of the wheelchair frame, and a locking mechanism for locking the wheelchair frame in the deployed state. The wheelchair frame includes a backrest bracket, a seat bracket whose rear end is rotatably connected to the middle of the backrest bracket, a front wheel bracket whose upper end is rotatably connected to the lower end of the backrest bracket, and a rear wheel bracket whose upper end is rotatably connected to the front end of the seat bracket; Characterized in that: The front wheel bracket and the rear wheel bracket are arranged in an X-shaped cross under the seat bracket. The front wheel bracket is located outside the rear wheel bracket. A sliding sleeve is provided at the cross portion of the front wheel bracket and the rear wheel bracket. The sliding sleeve is slidably sleeved on the front wheel bracket and is rotatably connected to the rear wheel bracket. The sliding sleeve has a tubular portion sleeved on the front wheel bracket and a boss vertically connected to the tubular portion and protruding inward. One end of the boss away from the tubular portion is rotatably connected to the middle of the rear wheel bracket. The sliding direction of the sliding sleeve is parallel to the rotation plane of the sliding sleeve; The wheelchair frame further includes a bottom support rod. The lower end of the bottom support rod is rotatably connected to the lower end of the rear wheel bracket. The upper end of the bottom support rod extends obliquely backward and upward and is rotatably connected to the lower end of the backrest bracket. The upper end of the bottom support rod, the upper end of the front wheel bracket, and the lower end of the backrest bracket are rotatably connected through a first rotating shaft; The upper end of the front wheel bracket is provided with a first cross beam. The middle of the first cross beam is provided with a first ear plate extending backward and upward. The lower end of the backrest bracket is provided with a second cross beam. The second cross beam is provided with a second ear plate extending forward and downward. The upper end of the bottom support rod is provided with a third cross beam. The middle of the third cross beam is provided with a rotating shaft support. The rotating shaft support is rotatably connected to the first ear plate and the second ear plate through the first rotating shaft; The extending direction of the first ear plate coincides with the extending direction of the front wheel bracket. There are two first ear plates arranged on both sides of the rotating shaft support; The included angle between the extending direction of the second ear plate and the extending direction of the backrest bracket is an obtuse angle. There are two second ear plates arranged on both sides of the rotating shaft support; The wheelchair frame further includes an armrest assembly, and the armrest assembly includes an armrest rod, an armrest support rod, and a locking member. The front end of the armrest rod extends forward, and the rear end of the armrest rod is rotatably connected to the middle part of the backrest bracket. The upper end of the armrest support rod is rotatably connected to the front end of the armrest rod, and the lower end of the armrest support rod is rotatably connected to the rear end of the seat bracket, so that the seat bracket, the backrest bracket, the armrest rod, and the armrest support rod form a four-bar linkage mechanism. A support rib plate parallel to the armrest rod is provided at the bottom of the armrest rod. The upper end of the armrest support rod is rotatably connected to the support rib plate through a second rotating shaft. A chute extending in a direction parallel to the armrest rod is further provided on the support rib plate. The second rotating shaft is slidably and rotatably inserted into the first chute. When the locking member is locked, the second rotating shaft can only rotate relative to the chute. The wheel assembly includes a front wheel assembly connected to the bottom of the front wheel bracket and a rear wheel assembly connected to the bottom of the rear wheel bracket. The foldable wheelchair is an electric wheelchair, and the foldable wheelchair further includes a drive motor provided on the rear wheel assembly and a power supply box provided on the rear wheel bracket.

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