WO2024131022A1 - Wheelchair armrest structure, wheelchair cushioning structure, and foldable wheelchair - Google Patents

Abstract

Provided is a wheelchair armrest structure (60). When a rotating base (612) rotates forwards to an extreme position, a second end portion of a lock pin (622) can be driven by a first spring (624) into a lock slot (623) to implement locking, and the second end portion impacts the inner wall of the lock slot (623) to make a locking sound. The wheelchair armrest structure (60) has good safety and a strong sense of quality. Provided is a wheelchair cushioning structure (40), which achieves cushioning through the use of a second spring (44) in coordination with the movement of a rear end portion of a rotating shaft fixing base (42) and a horizontal board (412) towards or away from one another, reducing the rotation amplitude of the rotating shaft fixing base (42), and which can also use the horizontal board (412) and a wheelchair frame (10) to limit the extreme rotation position of the rotating shaft fixing base (42), without needing to limit the position by means of a rotating shaft. Provided is a foldable wheelchair. When a locking mechanism (30) is unlocked, a backrest rod (11) is turned forward, thereby achieving the folding of the wheelchair frame (10). The foldable wheelchair has a simple structure and convenient operation.

Description

A wheelchair armrest structure, a wheelchair buffer structure and a foldable wheelchair Technical Field

The present invention belongs to the technical field of wheelchairs, and in particular relates to a wheelchair armrest structure, a wheelchair buffer structure and a foldable wheelchair.

Background technique

A wheelchair is a device used to provide convenience for people with difficulty walking. To ensure the safety and riding comfort of the wheelchair during travel, most wheelchairs are equipped with armrests on both sides. The existing wheelchair armrest structures are roughly divided into three categories: fixed, detachable and flip-up. The fixed armrest is the most primitive design. Due to its non-detachable nature, it will block the lateral entry and exit channel of the wheelchair, which is inconvenient to use; although the detachable armrest can be disassembled to open the lateral entry and exit channel of the wheelchair, the disassembly and assembly process is complicated and it is difficult for the user to operate alone; the flip-up armrest can be rotated to make the armrest rod switch between a supporting state (blocking the lateral entry and exit channel of the wheelchair) and a folded state (opening the lateral entry and exit channel of the wheelchair), thereby taking into account the safety and riding comfort of the wheelchair during travel, but most of these wheelchair armrest structures do not have a locking function. When the armrest rod is in a supporting state, it can still be rotated backwards, which poses a safety hazard. The rotation process of the armrest rod is also relatively loose, and the sense of luxury is not strong.

When a wheelchair is moving, it is bound to encounter potholes or bumpy roads. However, most wheelchairs on the market are not equipped with a buffer structure, and only use the rubber tires on the rollers for buffering, which makes them not very comfortable to use. A few wheelchairs are equipped with a buffer structure, but most of these structures achieve buffering through the relative movement of the wheel fork and the shaft fixing seat in the up and down directions, and require the use of a shaft connected to the wheelchair frame for limiting. In actual use, the wheel fork and the shaft fixing seat have a large up and down movement amplitude, and friction is easily generated between the shaft and the spring, which not only affects the service life, but also causes a creaking sound, and does not have a strong sense of luxury.

Furthermore, wheelchairs are not in use 24 hours a day. When not in use, they will take up a large space. To solve this problem, foldable wheelchairs have appeared on the market. They can be folded by folding the backrest and lowering the seat height to reduce the space occupied after folding, so that the wheelchair can be easily stuffed under the bed, in storage cabinets and other areas after folding. However, existing foldable wheelchairs have many rods and a complex structure. The folding and unfolding actions of the backrest are not related to the lowering and raising actions of the seat, which makes it inconvenient to operate when in use.

Summary of the invention

The purpose of the present invention is to overcome the shortcomings of the prior art and provide a wheelchair armrest structure with good safety and a high-end feel, a wheelchair buffer structure with a long service life, good comfort and a high-end feel, and a foldable wheelchair with a simple structure and easy operation.

To achieve the above object, the technical solution adopted by the present invention is that the wheelchair armrest structure includes an armrest rod and a locking unit, wherein the armrest rod is rotatably connected to a support plate, the support plate is welded to a backrest rod of a wheelchair frame, and the locking unit is used to lock the armrest rod in a supporting state, wherein the armrest rod includes a rod body having a supporting function and a rod body connected to the rod body. A rotating seat at the bottom of the body, the rotating seat being connected to the side of the support plate so as to be rotatable forward and backward;

The locking unit comprises an arc-shaped slide groove, a cylindrical locking pin, a U-shaped locking groove and a first spring, the slide groove is arranged at the upper end portion of the support plate, the center of the slide groove falls on the rotation axis center line of the rotating seat, the locking pin has a first end portion slidably inserted in the rotating seat and a second end portion slidably inserted in the slide groove, the sliding direction of the first end portion is perpendicular to the rotation axis center line of the rotating seat, and the sliding direction of the second end portion is the extension direction of the slide groove, the locking groove is arranged on the upper groove wall at the front end portion of the slide groove, the extension direction of the locking groove is perpendicular to the rotation axis center line of the rotating seat, the groove depth of the locking groove is greater than two-thirds of the diameter of the locking pin, and the first spring is arranged in the rotating seat, and the first spring has a tendency to drive the first end portion to slide in a direction away from the rotation axis center line of the rotating seat;

When the rotating seat rotates, the second end can be driven by the first end to slide in the sliding groove. When the rotating seat rotates forward to the extreme position, the second end slides below the locking groove. The first spring drives the first end to slide upward, driving the second end to enter the locking groove and hit the inner wall of the locking groove, so that the locking unit is locked and a locking sound is emitted.

Preferably, the locking unit also includes an unlocking button, which is provided with a first through hole matching the locking pin, and the locking pin is inserted into the first through hole. Pressing the unlocking button can drive the second end to disengage from the locking slot, thereby unlocking the locking unit.

Further preferably, the rotating seat is provided with a receiving groove for accommodating the unlocking button and a receiving hole for accommodating the first end, the receiving groove is a blind groove, the opening of the receiving groove is located on the outer wall of the rotating seat, and the receiving hole is vertically connected with the receiving groove.

Preferably, an arc-shaped damping groove is provided on the upper groove wall of the slide groove, and the damping groove is located on the rear side of the lock groove. The groove depth of the damping groove is one-third to one-half of the diameter of the lock pin. When the second end slides below the damping groove, the first spring drives the first end to slide upward, driving the second end to enter the damping groove and hit the inner wall of the damping groove, making a warning sound.

Further preferably, there are a plurality of damping grooves which are arranged continuously.

Preferably, the wheelchair armrest structure also includes a limit unit, which includes an arc-shaped limit groove and a limit block, the limit groove is arranged at the lower end of the support plate, the center of the limit groove falls on the rotation axis of the rotating seat, the limit block is connected to the side of the rotating seat facing the support plate, the limit block can be slidably inserted in the limit groove, and the limit block limits the limit position of the rotating seat when rotating by pressing against the end of the limit groove.

Preferably, the rotating seat and the supporting plate are both made of metal, a noise reduction sheet made of plastic is provided between the rotating seat and the supporting plate, and a notch for the locking pin to pass through is provided on the noise reduction sheet.

Preferably, the rotating seat is connected with an inserting portion extending upward, and the inserting portion is inserted into the inserting hole at the bottom of the rod body.

In order to achieve the above object, the technical solution adopted by the present invention is that the wheelchair buffer structure comprises:

A wheel fork, the wheel fork comprising fork plates forked on both sides of the wheelchair roller and a cross plate connected between the two fork plates;

A rotating shaft fixing seat, the rotating shaft fixing seat is arranged between the two fork plates, the front lower portion of the rotating shaft fixing seat is rotatably connected to the front end portion of the fork plate through a pin, and the rear end portion of the rotating shaft fixing seat is provided with a second through hole extending in the up-down direction;

A rotating shaft, the rotating shaft is arranged in the second through hole and is used for connecting to the wheelchair frame;

A second spring, wherein the second spring is arranged between the rotating shaft fixing seat and the horizontal plate and is located behind the pin, and the upper and lower ends of the second spring respectively press against the bottom surface of the rear end of the rotating shaft fixing seat and the upper surface of the horizontal plate, and the second spring has a tendency to drive the rear end of the rotating shaft fixing seat away from the horizontal plate.

Preferably, the middle part of the upper surface of the horizontal plate is arched upward to form an arched portion, and the front surface of the arched portion has a first limiting surface, an inner concave arc surface, and a second limiting surface connected in sequence, and the rear surface of the front lower part of the rotating shaft fixing seat has a first mating surface matching the first limiting surface, an outer convex arc surface matching the inner concave arc surface, and a second mating surface matching the second limiting surface, the inner concave arc surface and the outer convex arc surface are slidably fitted, and the centers of the inner concave arc surface and the outer convex arc surface fall on the axis center of the pin. On the line, when the front lower part of the rotating shaft fixing seat rotates around the pin so that the rear end part of the rotating shaft fixing seat and the cross plate move away from each other to the extreme position, the first limiting surface is in contact with the first matching surface, and a gap is provided between the second limiting surface and the second matching surface. When the front lower part of the rotating shaft fixing seat rotates around the pin so that the rear end part of the rotating shaft fixing seat and the cross plate move closer to each other to the extreme position, a gap is provided between the first limiting surface and the first matching surface, and the second limiting surface is in contact with the second matching surface.

Further preferably, the first limiting surface and the first matching surface are planes, and the second limiting surface and the second matching surface are arc surfaces.

Preferably, the shaft fixing seat includes a vertical section extending in the up-down direction and a horizontal section extending in the front-to-back direction, the upper end of the vertical section is connected to the front end of the horizontal section, and the lower end of the vertical section is rotatably connected to the front end of the fork plate through the pin.

Further preferably, the second through hole is opened on the horizontal section, the second through hole is a countersunk hole, the lower end of the rotating shaft has an annular flange, and the annular flange is located in the countersunk groove of the second through hole.

Further preferably, the outer circumferential surface of the annular flange is provided with a flat cut surface, and the inner wall of the countersunk groove is provided with a mating surface matching the flat cut surface, so as to prevent the rotating shaft from rotating.

Further preferably, the bottom surface of the horizontal section is provided with an upper groove for accommodating the upper end of the second spring, the upper groove is communicated with the second through hole, and the transverse plate is provided with a lower groove for accommodating the lower end of the second spring.

To achieve the above-mentioned object, the technical solution adopted by the present invention is that a foldable wheelchair comprises a wheelchair frame having an unfolded state and a folded state, a wheel assembly connected to the bottom of the wheelchair frame, and a locking mechanism;

The wheelchair frame comprises a backrest rod, a seat rod, a seat support rod and a bottom support rod, wherein the lower end of the backrest rod is rotatably connected to the rear end of the bottom support rod, the rear end of the seat rod is rotatably connected to the middle part of the backrest rod, the upper end of the seat support rod is rotatably connected to the middle part of the seat rod, and the lower end of the seat support rod is rotatably connected to the middle part of the bottom support rod, so that the backrest rod, the seat rod, the seat support rod and the bottom support rod form a four-bar linkage;

The locking mechanism is used to lock the wheelchair frame in an unfolded state. When the locking mechanism is unlocked, the wheelchair frame can be folded by rotating the backrest rod forward.

Preferably, the bottom support rod extends obliquely from the upper front to the lower rear, and the backrest rod, the seat rod and the seat support rod are supported on the wheel assembly through the bottom support rod. When the wheelchair frame is in an unfolded state, the backrest rod is perpendicular to the bottom support rod, the seat rod is roughly parallel to the horizontal plane, and the seat support rod is parallel to the backrest rod. When the wheelchair frame is in a folded state, the backrest rod, the seat rod and the seat support rod are close to the bottom support rod.

Further preferably, the substantially parallel means that the angle between the seat rod and the horizontal plane is 2° to 6°, and the front end of the seat rod is higher than the rear end of the seat rod.

Further preferably, when the wheelchair frame is in the unfolded state, the angle between the backrest rod and the seat rod is 95° to 105°.

Preferably, the locking mechanism includes a transverse support rod connected to the rear end of the seat rod, a locking block whose front end is rotatably connected to the middle part of the transverse support rod, a locking groove, and a transverse locking rod connected to the lower end of the backrest rod, the rotation axis of the locking block extending in the left and right directions, the rear end of the locking block extending rearward, and the locking groove is provided on the lower surface of the locking block, and the locking mechanism is locked when the rear end of the locking block is rotated rearward and downward so that the locking groove is engaged with the transverse locking rod, and the locking mechanism is unlocked when the rear end of the locking block is rotated forward and upward so that the locking groove is disengaged from the transverse locking rod.

Further preferably, after the locking mechanism is unlocked, the locking block is pushed forward, so that the backrest rod can be driven to rotate forward through the cross support rod and the seat rod, so that the wheelchair frame is transformed into a folded state.

Further preferably, the rear end of the locking block is connected to a push handle extending obliquely rearward and upward to facilitate pushing the rear end of the locking block to rotate forward and upward.

Further preferably, the locking mechanism further comprises a torsion spring, wherein the torsion spring is connected to the cross brace, an end of the torsion spring presses against an upper surface of the locking block, and the torsion spring has a tendency to drive the rear end of the locking block to rotate rearward and downward.

Further preferably, the middle portion of the cross brace is recessed downward to form a recessed portion, and the torsion spring is connected to the recessed portion.

Further preferably, the two ends of the transverse locking rod are connected to support seats extending obliquely forward and upward, and when the wheelchair frame is in the unfolded state, the top of the support seat presses against the two ends of the transverse support rod to enhance the stability of the wheelchair frame.

Preferably, the wheel assembly comprises a front roller and a rear roller, the front roller is connected to the bottom front portion of the bottom support rod via a buffer structure, and the rear roller is an electric drive wheel.

Further preferably, the buffer structure is any one of the above-mentioned wheelchair buffer structures.

Further preferably, the foldable wheelchair also includes a drive motor for driving the rear rollers to rotate, a battery box for providing power to the drive motor, and a controller for controlling the action of the drive motor, the drive motor being arranged at the connecting portion of the backrest rod and the bottom support rod, and the power box being connected to the bottom support rod and arranged close to the drive motor.

Further preferably, the foldable wheelchair further comprises an armrest structure, and the controller is arranged on the armrest structure.

Further preferably, the armrest structure is any one of the above-mentioned wheelchair armrest structures.

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

The wheelchair armrest structure provided by the present invention has a first spring that drives the first end of the lock pin to move upward when the rotating seat rotates forward to the extreme position, driving the second end of the lock pin to enter the lock slot and hit the inner wall of the lock slot, thereby achieving locking and improving safety, and making a locking sound to enhance the sense of luxury. At the same time, due to the presence of the first spring, during the rotation of the rotating seat, the second end of the lock pin and the upper groove wall of the slide groove are in a sliding abutment state, with large friction, which can significantly improve the sense of relaxation during the rotation process, thereby enhancing the sense of luxury.

The wheelchair buffer structure provided by the present invention arranges a transverse plate between the wheel fork fork plates so that the front lower part of the rotating shaft fixing seat is rotatably connected with the front end part of the fork plate through a pin, and a second spring is arranged between the rear end part of the rotating shaft fixing seat and the transverse plate. The second spring can be used to cooperate with the mutual approach or separation of the rear end part of the rotating shaft fixing seat and the transverse plate to achieve buffering, and the rotation amplitude is small. At the same time, the transverse plate can be used to limit the extreme position of the rotating shaft fixing seat for downward rotation, and the wheelchair frame can be used to limit the extreme position of the rotating shaft fixing seat for upward rotation. There is no need to limit the position by the rotating shaft, and there is no friction between the rotating shaft and the second spring. The service life is long, the comfort is good, no creaking sound is made, and the sense of luxury is strong.

The foldable wheelchair provided by the present invention can make the backrest rod, the seat rod, the seat support rod and the bottom support rod form a four-bar mechanism by rotatably connecting the lower end of the backrest rod with the rear end of the bottom support rod, rotatably connecting the rear end of the seat rod with the middle part of the backrest rod, rotatably connecting the upper end of the seat support rod with the middle part of the seat rod, and rotatably connecting the lower end of the seat support rod with the middle part of the bottom support rod. When the locking mechanism is unlocked, the backrest rod can be rotated forward to realize the action of folding the backrest and lowering the seat, thereby completing the folding of the wheelchair frame. The structure is simple and the operation is convenient.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective schematic diagram of a preferred embodiment of a foldable wheelchair according to the present invention.

Fig. 2, Fig. 3 and Fig. 4 are left view schematic diagrams of Fig. 1, wherein the wheelchair frame in Fig. 2 is in an unfolded state, the wheelchair frame in Fig. 4 is in a folded state, and the wheelchair frame in Fig. 3 is in an intermediate state from the unfolded state to the folded state.

FIG. 5 is a schematic cross-sectional view of FIG. 2 .

Fig. 6 and Fig. 7 are partial enlarged schematic diagrams of the locking mechanism in Fig. 5 , wherein the locking mechanism in Fig. 6 is in a locked state, and the locking mechanism in Fig. 7 is in an unlocked state.

FIG. 8 is a schematic diagram of a three-dimensional assembly explosion of the handrail structure in FIG. 1 .

Figures 9, 10, 11 and 12 are side schematic diagrams of the handrail structure in Figure 1, showing the process of the handrail rod changing from a supporting state to a retracted state, wherein the handrail rod in Figure 9 is in a supporting state, and the handrail rod in Figure 12 is in a retracted state.

FIG. 13 is an enlarged schematic cross-sectional view of the handrail structure in FIG. 1 .

FIG. 14 is a schematic diagram of a three-dimensional assembly decomposition of the buffer structure at the front roller in FIG. 1 .

Figures 15 and 16 are enlarged schematic cross-sectional views of the buffer structure at the front roller in Figure 1, wherein Figure 15 is in a state where the rear end of the rotating shaft fixing seat and the cross plate are separated from each other to the extreme positions, and Figure 16 is in a state where the rear end of the rotating shaft fixing seat and the cross plate are brought close to each other to the extreme positions.

FIG. 17 is an enlarged cross-sectional schematic diagram of the buffer structure at the front roller in FIG. 1 , used to illustrate the connection between the rotating shaft and the wheelchair frame.

Among them: 10. wheelchair frame; 11. backrest rod; 12. seat rod; 13. seat support rod; 14. bottom support rod; 15. first rotation axis; 16. second rotation axis; 17. third rotation axis; 18. fourth rotation axis; 19. support plate; 21. front roller; 22. rear roller; 30. locking mechanism; 31. horizontal support rod; 32. locking block; 33. locking slot; 34. horizontal locking rod; 35. push handle; 36. Hook portion; 37. Torsion spring; 38. Concave portion; 39. Support seat; 40. Wheelchair buffer structure; 41. Wheel fork; 411. Fork plate; 412. Horizontal plate; 413. Arched portion; 414. First limiting surface; 415. Inner concave arc surface; 416. Second limiting surface; 417. Lower groove; 42. Rotating shaft fixing seat; 421. Pin; 422. Second through hole; 423. First matching surface; 42 4. convex arc surface; 425. second mating surface; 426. vertical section; 427. horizontal section; 428. upper groove; 43. rotating shaft; 431. annular flange; 432. flat cut surface; 44. second spring; 51. driving motor; 52. battery box; 53. controller; 60. wheelchair armrest structure; 61. armrest rod; 611. rod body; 612. rotating seat; 613. receiving groove; 614. receiving Nanohole; 615. Noise reduction sheet; 616. Notch; 617. Plug-in portion; 618. Plug-in hole; 62. Locking unit; 621. Slide groove; 622. Locking pin; 623. Locking groove; 624. First spring; 625. First end; 626. Second end; 627. Unlocking button; 628. First through hole; 629. Damping groove; 63. Limiting unit; 631. Limiting groove; 632. Limiting block.

Detailed ways

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

The front-to-back direction, left-to-right direction, and up-down direction described in the present invention are based on the front-to-back direction, left-to-right direction, and up-down direction observed by the user when riding the foldable wheelchair provided by the present invention.

As shown in FIGS. 1 to 17 , the foldable wheelchair provided by the present invention comprises a wheelchair frame 10 having an unfolded state and a folded state, a wheel assembly connected to the bottom of the wheelchair frame 10, and a locking mechanism 30 for locking the wheelchair frame 10 in the unfolded state, wherein the wheelchair frame 10 comprises a backrest rod 11, a seat rod 12, a seat support rod 13, and a bottom support rod 14, wherein the lower end of the backrest rod 11 is connected to the bottom support rod 14. The rear end of the rod 14 is rotatably connected via the first rotating shaft 15, the rear end of the seat rod 12 is rotatably connected to the middle part of the backrest rod 11 via the second rotating shaft 16, the upper end of the seat support rod 13 is rotatably connected to the middle part of the seat rod 12 via the third rotating shaft 17, and the lower end of the seat support rod 13 is rotatably connected to the middle part of the bottom support rod 14 via the fourth rotating shaft 18, so that the backrest rod 11, the seat rod 12, the seat support rod 13 and the bottom support rod 14 form a four-bar linkage; when the locking mechanism 30 is unlocked, the backrest rod 11 is rotated forward to drive the seat rod 12 and the seat support rod 13 to move closer to the bottom support rod 14 through the four-bar linkage, so that the wheelchair frame 10 is folded, so that the foldable wheelchair has fewer rods, a simple structure, and is easy to operate.

In this embodiment, the bottom support rod 14 extends obliquely from the upper front to the lower rear, and the backrest rod 11, the seat rod 12, and the seat support rod 13 are supported on the wheel assembly through the bottom support rod 14. When the wheelchair frame 10 is in the unfolded state, the backrest rod 11 is perpendicular to the bottom support rod 14, and the seat rod 12 is roughly parallel to the horizontal plane. The roughly parallel means that the angle between the seat rod 12 and the horizontal plane is 2° to 6° (preferably 4°), and the front end of the seat rod 12 is higher than the rear end of the seat rod 12, and the seat support rod 13 is parallel to the backrest rod 11. When the wheelchair frame 10 is in the folded state, the backrest rod 11 is perpendicular to the bottom support rod 14, and the seat rod 12 is roughly parallel to the horizontal plane. 1. The seat rod 12, the seat support rod 13 and the bottom support rod 14 are close to each other. When the wheelchair frame 10 is in the unfolded state, the angle between the backrest rod 11 and the seat rod 12 is 95° to 105° (preferably 100°). The advantage of such a setting is that when the wheelchair frame 10 is unfolded, the riding comfort of the user can be improved as much as possible. When the wheelchair frame 10 is folded, the height of the wheelchair frame 10 after folding can be reduced as much as possible by utilizing the parallel rotation of the backrest rod 11 and the bottom support rod 14, thereby reducing the occupied space. It also makes the visual appearance of the wheelchair frame 10 more symmetrical and beautiful, with a sense of luxury.

In this embodiment, the wheel assembly includes a front roller 21 and a rear roller 22, the front roller 21 is connected to the bottom front part of the bottom support rod 14 through a buffer structure, the rear roller 22 is an electric drive wheel, and the buffer structure is a wheelchair buffer structure 40, which includes a wheel fork 41, a rotating shaft fixing seat 42, a rotating shaft 43, and a second spring 44, wherein the wheel fork 41 includes a fork plate 411 forked on both sides of the front roller 21 and a cross plate 412 connected between the two fork plates 411; the rotating shaft fixing seat 42 is set between the two fork plates 411, and the front lower part of the rotating shaft fixing seat 42 is connected by a pin 421 The rear end of the rotating shaft fixing seat 42 is rotatably connected to the front end of the fork plate 411 and is provided with a second through hole 422 extending in the up-down direction; the rotating shaft 43 is arranged in the second through hole 422 and is used to connect the bottom front part of the bottom support rod 14 of the wheelchair frame 10; the second spring 44 is arranged between the rotating shaft fixing seat 42 and the cross plate 412 and is located behind the pin 421, and the upper and lower ends of the second spring 44 are respectively pressed against the bottom surface of the rear end of the rotating shaft fixing seat 42 and the upper surface of the cross plate 412, and the second spring 44 has a tendency to drive the rear end of the rotating shaft fixing seat 42 away from the cross plate 412.

The advantage of such an arrangement is that the second spring 44 can be used in conjunction with the rear end of the shaft fixing seat 42 and the cross plate 412 to move closer to or further away from each other to achieve buffering, and the rotation amplitude of the shaft fixing seat 42 is small. At the same time, the cross plate 412 can be used to limit the extreme position of the shaft fixing seat 42 for rotating downward, and the bottom support rod 14 of the wheelchair frame 10 can be used to limit the extreme position of the shaft fixing seat 42 for rotating upward. There is no need to limit the position by the shaft 43, and there is no friction between the shaft 43 and the second spring 44. The service life is long, the comfort is good, there is no creaking sound, and it has a strong sense of luxury.

Furthermore, the middle portion of the upper surface of the horizontal plate 412 is arched upward to form an arched portion 413, and the front surface of the arched portion 413 has There are a first limiting surface 414, an inner concave arc surface 415, and a second limiting surface 416 connected in sequence. The rear surface of the front lower part of the rotating shaft fixing seat 42 has a first matching surface 423 matching the first limiting surface 414, an outer convex arc surface 424 matching the inner concave arc surface 415, and a second matching surface 425 matching the second limiting surface 416. The inner concave arc surface 415 and the outer convex arc surface 424 are slidably fitted, and the centers of the inner concave arc surface 415 and the outer convex arc surface 424 fall on the axis of the pin 421. When the front lower part of the rotating shaft fixing seat 42 rotates around the pin 421, the rear end of the rotating shaft fixing seat 42 and the horizontal plate 412 are moved away from each other to the limit position. The first limiting surface 414 is in contact with the first matching surface 423, and there is a gap between the second limiting surface 416 and the second matching surface 425. When the front lower part of the rotating shaft fixing seat 42 rotates around the pin 421, so that the rear end of the rotating shaft fixing seat 42 and the cross plate 412 are close to each other to the extreme position, there is a gap between the first limiting surface 414 and the first matching surface 423, and the second limiting surface 416 is in contact with the second matching surface 425. The limiting is achieved by the contact between the first limiting surface 414 and the first matching surface 423 and the contact between the second limiting surface 416 and the second matching surface 425, which can prevent the rotating shaft fixing seat 42 from colliding with the cross plate 412 and the bottom support rod 14 during rotation.

Furthermore, the first limiting surface 414 and the first matching surface 423 are planes (vertical surfaces) extending in the up-down direction, and the second limiting surface 416 and the second matching surface 425 are arc surfaces.

Furthermore, the rotating shaft fixing seat 42 includes a vertical section 426 extending in the up-down direction and a horizontal section 427 extending in the front-to-back direction. The upper end of the vertical section 426 is connected to the front end of the horizontal section 427, and the lower end of the vertical section 426 is rotatably connected to the front end of the fork plate 411 through a pin 421. The horizontal section 427 is used to open a second through hole 422. Specifically, the second through hole 422 is opened on the horizontal section 427, and the second through hole 422 is a countersunk hole. The lower end of the rotating shaft 43 has an annular flange 431, and the annular flange 431 is located in the countersunk groove of the second through hole 422. To prevent the rotating shaft 43 from rotating on its own, further, the outer circumferential surface of the annular flange 431 is provided with a flat cut surface 432, and the inner wall of the countersunk groove is provided with a mating surface matching the flat cut surface 432. The matching and fitting of the flat cut surface 432 and the mating surface ensure that the rotating shaft 43 does not rotate on its own.

To prevent the second spring 44 from detaching, the bottom surface of the horizontal section 427 is further provided with an upper groove 428 for accommodating the upper end of the second spring 44, and the upper groove 428 is communicated with the second through hole 422. The rear surface of the arched portion 413 of the horizontal plate 412 is provided with a lower groove 417 for accommodating the lower end of the second spring 44. The lower groove 417 is located directly below the upper groove 428 and extends vertically downward.

When the rear end of the locking block 32 is rotated backward and downward so that the locking groove 33 is engaged with the transverse locking rod 34, the locking mechanism 30 is locked. When the rear end of the locking block 32 is rotated forward and upward so that the locking groove 33 is disengaged from the transverse locking rod 34, the locking mechanism 30 is unlocked. Further, after the locking mechanism 30 is unlocked, the locking block 32 is pushed forward, and the backrest rod 11 can be driven to rotate forward through the transverse brace rod 31 and the seat rod 12, so that the wheelchair frame 10 is transformed into a folded state, thereby improving the convenience and high-end feeling of use.

Furthermore, a protrusion is provided on the lower surface of the locking block 32, and a locking groove 33 is opened on the protrusion to form a hook portion 36. The rear end of the locking block 32 is also connected to a push handle 35 extending obliquely backward and upward to facilitate pushing the rear end of the locking block 32 to rotate forward and upward.

To facilitate the resetting of the locking block 32, the locking mechanism 30 further includes a torsion spring 37, which is connected to the cross brace 31. The end of the torsion spring 37 is pressed against the upper surface of the locking block 32, and the torsion spring has a tendency to drive the rear end of the locking block 32 to rotate rearward and downward.

Furthermore, the middle portion of the cross brace 31 is recessed downward to form a recess 38 , and the torsion spring 37 is connected to the recess 38 , so as to form a larger space above the rear end of the locking block 32 to facilitate the rotation of the locking block 32 .

Furthermore, the two ends of the transverse locking rod 34 are connected to support seats 39 extending obliquely forward and upward. When the wheelchair frame 10 is in the unfolded state, the top of the support seat 39 presses against the two ends of the transverse support rod 31 to enhance the stability of the wheelchair frame 10.

To facilitate the electric drive of the rear roller 22, in the present embodiment, the foldable wheelchair further includes a drive motor 51 for driving the rear roller 22 to rotate, a battery box 52 for providing power to the drive motor 51, and a controller 53 for controlling the action of the drive motor 51. The drive motor 51 is disposed at the connection between the backrest rod 11 and the bottom support rod 14, and the power box 52 is connected to the bottom support rod 14 and disposed close to the drive motor 51.

The foldable wheelchair also includes an armrest structure, which is a wheelchair armrest structure 60, which includes an armrest rod 61 and a locking unit 62. The armrest rod 61 is rotatably connected to the support plate 19, and the support plate 19 is welded to the backrest rod 11 of the wheelchair frame 10 and is located above the seat rod 12. The locking unit 62 is used to lock the armrest rod 61 in a supporting state. The armrest rod 61 includes a rod body 611 that plays a supporting role and a rotating seat 612 connected to the bottom of the rod body 611. The rotating seat 612 is connected to the bottom of the rod body 611. The seat 612 is connected to the side of the support plate 19 so as to be rotatable forward and backward; the locking unit 62 includes an arc-shaped slide groove 621, a cylindrical locking pin 622, a U-shaped locking groove 623 and a first spring 624, the slide groove 621 is opened at the upper end of the support plate 19, the center of the slide groove 621 falls on the rotation axis of the rotating seat 612, the locking pin 622 has a first end 625 slidably inserted in the rotating seat 612 and a second end 626 slidably inserted in the slide groove 621, the first end The sliding direction of 625 is perpendicular to the rotation axis of the rotating seat 612, the sliding direction of the second end 626 is the extension direction of the slide groove 621, the locking groove 623 is arranged on the upper groove wall of the front end of the slide groove 621, the extension direction of the locking groove 623 is perpendicular to the rotation axis of the rotating seat 612, the groove depth of the locking groove 623 is greater than two-thirds of the diameter of the locking pin 622, the first spring 624 is arranged in the rotating seat 612, and the first spring 624 has the function of driving the first end 625 away from the rotating seat 612. The movable seat 612 has a tendency to slide in the direction of the rotation axis; when the rotating seat 612 rotates, the first end 625 can drive the second end 626 to slide in the slide groove 621. When the rotating seat 612 rotates forward to the extreme position, the second end 626 slides to the bottom of the locking groove 623, and the first spring 624 drives the first end 625 to slide upward, driving the second end 626 to enter the locking groove 623 and hit the inner wall of the locking groove 623, so that the locking unit 62 is locked and a locking sound is emitted.

The advantage of such a configuration is that when the locking unit 62 is locked, more than two-thirds of the second end portion 626 can be engaged in the locking groove 623, so that the rotating seat 612 cannot rotate in the reverse direction, thereby achieving locking and improving safety. The first spring 624 can drive the second end 626 to hit the inner wall of the lock groove 623, thereby making a locking sound, thereby enhancing the sense of luxury. At the same time, due to the existence of the first spring 624, during the rotation of the rotating seat 612, the second end 626 of the locking pin 622 and the upper groove wall of the slide groove 621 are in a sliding abutment state, and the friction force is large, which can significantly improve the sense of relaxation during the rotation process, thereby enhancing the sense of luxury.

Furthermore, the locking unit 62 also includes an unlocking button 627, which has a first through hole 628 matching the locking pin 622. The locking pin 622 is inserted into the first through hole 628. Pressing the unlocking button 627 can drive the second end 626 to disengage from the locking slot 623, thereby unlocking the locking unit 62.

To improve the convenience and aesthetics of use, the rotating seat 612 is further provided with a receiving groove 613 for accommodating the unlocking button 627 and a receiving hole 614 for accommodating the first end 625. The receiving groove 613 is a blind groove, and the opening of the receiving groove 613 is located on the outer wall of the rotating seat 612. When the handrail rod 61 is in the supporting state, the opening of the receiving groove 613 faces forward and upward and is located on the side and rear of the user's waist. The receiving hole 614 is vertically connected with the receiving groove 613. The first spring 624 is arranged in the receiving groove 613, and the two ends of the first spring 624 are respectively pressed against the bottom wall of the receiving groove 613 and the bottom wall of the unlocking button 627. To prevent the first spring 624 from shaking, a spring groove is provided on the bottom wall of the unlocking button 627. The spring groove extends upward and is vertically connected with the through hole 614, so that the upper end of the first spring 624 can directly press against the part of the locking pin 622 passing through the first through hole 628, and the elastic force is released more directly.

The advantage of such a configuration is that the unlocking button 627 can be located in a position that is not easily touched, thereby avoiding misoperation. At the same time, since the locking pin 622 is inserted into the first through hole 628 of the unlocking button 627 and its first end 625 is inserted into the accommodating hole 614, the locking pin 622 can prevent the unlocking button 627 from being separated from the accommodating groove 613, without the need for additional anti-slip parts, and the overall structure of the locking unit 62 is more compact, without the need for locking parts such as screws and bolts.

Furthermore, an arc-shaped damping groove 629 is provided on the upper groove wall of the slide groove 621, and the damping groove 629 is located at the rear side of the locking groove 623. The groove depth of the damping groove 629 is one-third to one-half of the diameter of the locking pin 622. When the second end 626 slides below the damping groove 629, the first spring 624 drives the first end 625 to slide upward, driving the second end 626 to enter the damping groove 629 and hit the inner wall of the damping groove 629, making a prompt sound, thereby enhancing the sense of luxury. Moreover, this entry does not hinder the continued rotation of the rotating seat 612. At this time, continuing to pull the handrail rod 611 forward and backward can drive the second end 626 to automatically slide out of the damping groove 629, so that the handrail rod 611 is changed to a supporting state or a folded state. Furthermore, the damping groove 629 has three and continuous The arrangement is such that the upper groove wall of the sliding groove 621 is located behind the locking groove 623. When the second end portion 626 is located at the damping groove 629 at the rearmost side, the center of gravity of the handrail rod 611 is located behind the rotation axis of the rotating seat 612. When the second end portion 626 is located at the damping groove 629 at other positions, the center of gravity of the handrail rod 611 is located above or in front of the rotation axis of the rotating seat 612. That is to say, only when the rotating seat 612 is rotated backward to the extreme position so that the handrail rod 611 is changed to the folded state, the center of gravity of the handrail rod 612 is located behind the rotation axis of the rotating seat 612. The advantage of such an arrangement is that in the absence of external force, the handrail rod 611 can be stabilized in the folded state to achieve self-stability. At the same time, when the handrail rod 611 is moved toward the front plate, it can be unlocked without unlocking. The armrest bar 611 is transformed into the supporting state and automatically locked in the supporting state, and this pulling force only needs to be an instantaneous force. After the second end 626 is separated from the damping groove 629 on the rearmost side, the inertia of the armrest bar 611 can be used to drive the armrest bar 611 to rotate forward; during the process of the armrest bar 611 rotating forward and transforming from the folded state to the supporting state, a part of the rotational inertia of the armrest bar 611 can also be absorbed by the damping groove 629 to slow down the rotation speed, thereby further improving the sense of luxury and stability of use.

Furthermore, the wheelchair armrest structure 60 also includes a limit unit 63, which includes an arc-shaped limit groove 631 and a limit block 632. The limit groove 631 is arranged at the lower end of the support plate 19, and the center of the limit groove 631 falls on the rotation axis of the rotating seat 612. The limit block 632 is connected to the side of the rotating seat 612 facing the support plate 19. The limit block 632 can be slidably inserted in the limit groove 631. The limit block 632 limits the extreme position of the rotating seat 612 when rotating by pressing against the end of the limit groove 631.

Furthermore, the rotating seat 612 , the locking pin 622 and the support plate 19 are all made of metal. A noise reduction sheet 615 made of plastic is provided between the rotating seat 612 and the support plate 19 . A notch 616 is provided on the noise reduction sheet 615 for the locking pin 622 to pass through.

Furthermore, an inserting portion 617 extending upward is connected to the rotating seat 612 , and the inserting portion 617 is inserted into an inserting hole 618 at the bottom of the rod body 611 .

It should be noted that the front end of the bottom support rod 14 is connected to the bottom front beam, the rear end of the bottom support rod 14 is connected to the bottom rear beam, the bottom support rod 14, the bottom front beam and the bottom rear beam form a U-shape, the front part of the bottom front beam is connected to a pedal rod, and a foot pedal is supported on the pedal rod. The diameter of the rear roller 22 is 1.4 to 1.6 times (preferably 1.5 times) the diameter of the front roller 21, and the controller 53 is in the shape of a yacht, and the controller 53 is arranged at the front end of the rod body 611 of the handrail rod 61.

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 this technology to understand the contents of the present invention and implement them accordingly. 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 (30)

A wheelchair armrest structure comprises an armrest rod and a locking unit, wherein the armrest rod is rotatably connected to a support plate, the support plate is welded to a backrest rod of a wheelchair frame, and the locking unit is used to lock the armrest rod in a supporting state, and is characterized in that: The handrail bar includes a bar body for supporting and a rotating seat connected to the bottom of the bar body, and the rotating seat is connected to the side of the support plate so as to be rotatable forward and backward; The locking unit comprises an arc-shaped slide groove, a cylindrical locking pin, a U-shaped locking groove and a first spring, the slide groove is arranged at the upper end portion of the support plate, the center of the slide groove falls on the rotation axis center line of the rotating seat, the locking pin has a first end portion slidably inserted in the rotating seat and a second end portion slidably inserted in the slide groove, the sliding direction of the first end portion is perpendicular to the rotation axis center line of the rotating seat, and the sliding direction of the second end portion is the extension direction of the slide groove, the locking groove is arranged on the upper groove wall at the front end portion of the slide groove, the extension direction of the locking groove is perpendicular to the rotation axis center line of the rotating seat, the groove depth of the locking groove is greater than two-thirds of the diameter of the locking pin, and the first spring is arranged in the rotating seat, and the first spring has a tendency to drive the first end portion to slide in a direction away from the rotation axis center line of the rotating seat; When the rotating seat rotates, the second end can be driven by the first end to slide in the sliding groove. When the rotating seat rotates forward to the extreme position, the second end slides below the locking groove. The first spring drives the first end to slide upward, driving the second end to enter the locking groove and hit the inner wall of the locking groove, so that the locking unit is locked and a locking sound is emitted. The wheelchair armrest structure according to claim 1 is characterized in that: the locking unit also includes an unlocking button, the unlocking button is provided with a first through hole matching the locking pin, the locking pin is inserted into the first through hole, and pressing the unlocking button can drive the second end to disengage from the locking slot, thereby unlocking the locking unit. The wheelchair armrest structure according to claim 2 is characterized in that: the rotating seat is provided with a receiving groove for accommodating the unlocking button, and a receiving hole for accommodating the first end portion, the receiving groove is a blind groove, the opening of the receiving groove is located on the outer wall of the rotating seat, and the receiving hole is vertically connected with the receiving groove. The wheelchair armrest structure according to claim 1 is characterized in that: an arc-shaped damping groove is provided on the upper groove wall of the slide groove, the damping groove is located on the rear side of the lock groove, the groove depth of the damping groove is one-third to one-half of the diameter of the lock pin, and when the second end slides below the damping groove, the first spring drives the first end to slide upward, driving the second end to enter the damping groove and hit the inner wall of the damping groove, making a warning sound. The wheelchair armrest structure according to claim 4 is characterized in that there are multiple damping grooves and they are arranged continuously. The wheelchair armrest structure according to claim 1 is characterized in that: the wheelchair armrest structure also includes a limiting unit, the limiting unit includes an arc-shaped limiting groove and a limiting block, the limiting groove is arranged at the lower end of the support plate, the center of the limiting groove falls on the rotation axis of the rotating seat, the limiting block is connected to the side of the rotating seat facing the support plate, the limiting block is slidably inserted in the limiting groove, and the limiting block is limited by pressing against the end of the limiting groove Determine the limit position of the rotating seat when rotating. The wheelchair armrest structure according to claim 1 is characterized in that: the rotating seat and the support plate are both made of metal, a noise reduction sheet made of plastic is provided between the rotating seat and the support plate, and a notch is provided on the noise reduction sheet for the locking pin to pass through. The wheelchair armrest structure according to claim 1 is characterized in that: the rotating seat is connected to an upwardly extending plug-in portion, and the plug-in portion is inserted into the plug-in hole at the bottom of the rod body. A wheelchair buffer structure, characterized by comprising: A wheel fork, the wheel fork comprising fork plates forked on both sides of the wheelchair roller and a cross plate connected between the two fork plates; A rotating shaft fixing seat, the rotating shaft fixing seat is arranged between the two fork plates, the front lower portion of the rotating shaft fixing seat is rotatably connected to the front end portion of the fork plate through a pin, and the rear end portion of the rotating shaft fixing seat is provided with a second through hole extending in the up-down direction; A rotating shaft, the rotating shaft is arranged in the second through hole and is used for connecting to the wheelchair frame; A second spring, wherein the second spring is arranged between the rotating shaft fixing seat and the horizontal plate and is located behind the pin, and the upper and lower ends of the second spring respectively press against the bottom surface of the rear end of the rotating shaft fixing seat and the upper surface of the horizontal plate, and the second spring has a tendency to drive the rear end of the rotating shaft fixing seat away from the horizontal plate. The wheelchair buffer structure according to claim 9 is characterized in that: the middle part of the upper surface of the horizontal plate is arched upward to form an arched portion, the front surface of the arched portion has a first limiting surface, an inner concave arc surface, and a second limiting surface connected in sequence, the rear surface of the front lower part of the rotating shaft fixing seat has a first mating surface matching the first limiting surface, an outer convex arc surface matching the inner concave arc surface, and a second mating surface matching the second limiting surface, the inner concave arc surface is slidably fitted with the outer convex arc surface, and the center of the inner concave arc surface and the outer convex arc surface are Falling on the axis line of the pin, the front lower part of the rotating shaft fixing seat rotates around the pin so that the rear end of the rotating shaft fixing seat and the cross plate move away from each other to the extreme position, the first limiting surface is in contact with the first matching surface, and there is a gap between the second limiting surface and the second matching surface. When the front lower part of the rotating shaft fixing seat rotates around the pin so that the rear end of the rotating shaft fixing seat and the cross plate move closer to each other to the extreme position, there is a gap between the first limiting surface and the first matching surface, and the second limiting surface is in contact with the second matching surface. The wheelchair buffer structure according to claim 10 is characterized in that the first limiting surface and the first matching surface are planes, and the second limiting surface and the second matching surface are arc surfaces. The wheelchair buffer structure according to claim 9 is characterized in that: the shaft fixing seat includes a vertical section extending in the up-down direction and a horizontal section extending in the front-back direction, the upper end of the vertical section is connected to the front end of the horizontal section, and the lower end of the vertical section is rotatably connected to the front end of the fork plate through the pin. The wheelchair buffer structure according to claim 12 is characterized in that: the second through hole is opened in the horizontal section The second through hole is a countersunk hole, and the lower end of the rotating shaft has an annular flange, and the annular flange is located in the countersunk groove of the second through hole. The wheelchair buffer structure according to claim 13 is characterized in that: the outer circumferential surface of the annular flange is provided with a flat cut surface, and the inner wall of the countersunk groove is provided with a matching surface matching the flat cut surface, which is used to prevent the rotating shaft from rotating. The wheelchair buffer structure according to claim 13 is characterized in that: the bottom surface of the horizontal section is provided with an upper groove for accommodating the upper end of the second spring, the upper groove is connected to the second through hole, and the horizontal plate is provided with a lower groove for accommodating the lower end of the second spring. A foldable wheelchair comprises a wheelchair frame having an unfolded state and a folded state, a wheel assembly connected to the bottom of the wheelchair frame, and a locking mechanism; the characteristics are: The wheelchair frame comprises a backrest rod, a seat rod, a seat support rod and a bottom support rod, wherein the lower end of the backrest rod is rotatably connected to the rear end of the bottom support rod, the rear end of the seat rod is rotatably connected to the middle part of the backrest rod, the upper end of the seat support rod is rotatably connected to the middle part of the seat rod, and the lower end of the seat support rod is rotatably connected to the middle part of the bottom support rod, so that the backrest rod, the seat rod, the seat support rod and the bottom support rod form a four-bar linkage; The locking mechanism is used to lock the wheelchair frame in an unfolded state. When the locking mechanism is unlocked, the wheelchair frame can be folded by rotating the backrest rod forward. The foldable wheelchair according to claim 16 is characterized in that: the bottom support rod extends obliquely from the upper front to the lower rear, the backrest rod, the seat rod, and the seat support rod are supported on the wheel assembly through the bottom support rod, when the wheelchair frame is in the unfolded state, the backrest rod is perpendicular to the bottom support rod, the seat rod is roughly parallel to the horizontal plane, and the seat support rod is parallel to the backrest rod, and when the wheelchair frame is in the folded state, the backrest rod, the seat rod, the seat support rod and the bottom support rod are close to each other. The foldable wheelchair according to claim 17 is characterized in that: the substantially parallel means that the angle between the seat rod and the horizontal plane is 2° to 6°, and the front end of the seat rod is higher than the rear end of the seat rod. The foldable wheelchair according to claim 17 is characterized in that when the wheelchair frame is in the unfolded state, the angle between the backrest rod and the seat rod is 95° to 105°. The foldable wheelchair according to claim 16 is characterized in that: the locking mechanism includes a cross brace connected to the rear end of the seat rod, a locking block whose front end is rotatably connected to the middle part of the cross brace, a locking groove, and a transverse locking rod connected to the lower end of the backrest rod, the rotation axis of the locking block extends in the left and right directions, the rear end of the locking block extends backward, and the locking groove is provided on the lower surface of the locking block, and the locking mechanism is locked when the rear end of the locking block is rotated backward and downward so that the locking groove is engaged with the transverse locking rod, and the locking mechanism is unlocked when the rear end of the locking block is rotated forward and upward so that the locking groove is disengaged from the transverse locking rod. The foldable wheelchair according to claim 20 is characterized in that: after the locking mechanism is unlocked, the wheelchair is pushed forward. The locking block can drive the backrest rod to rotate forward through the cross brace rod and the seat rod, so that the wheelchair frame is transformed into a folded state. The foldable wheelchair according to claim 20 is characterized in that a push handle extending obliquely backward and upward is connected to the rear end of the locking block to facilitate pushing the rear end of the locking block to rotate forward and upward. The foldable wheelchair according to claim 20 is characterized in that: the locking mechanism also includes a torsion spring, the torsion spring is connected to the cross brace, the end of the torsion spring is pressed against the upper surface of the locking block, and the torsion spring has a tendency to drive the rear end of the locking block to rotate rearward and downward. The foldable wheelchair according to claim 23 is characterized in that the middle portion of the cross brace is recessed downward to form a recessed portion, and the torsion spring is connected to the recessed portion. The foldable wheelchair according to claim 20 is characterized in that: the two ends of the transverse locking rod are connected to support seats extending obliquely forward and upward, and when the wheelchair frame is in the unfolded state, the top of the support seat is pressed against the two ends of the transverse support rod to enhance the stability of the wheelchair frame. The foldable wheelchair according to claim 16 is characterized in that: the wheel assembly includes a front roller and a rear roller, the front roller is connected to the bottom front portion of the bottom support rod through a buffer structure, and the rear roller is an electric drive wheel. The foldable wheelchair according to claim 26 is characterized in that the buffer structure is the wheelchair buffer structure according to any one of claims 9 to 15. The foldable wheelchair according to claim 26 is characterized in that: the foldable wheelchair also includes a drive motor for driving the rear roller to rotate, a battery box for providing power to the drive motor, and a controller for controlling the action of the drive motor, the drive motor is arranged at the connection between the backrest rod and the bottom support rod, and the power box is connected to the bottom support rod and is arranged close to the drive motor. The foldable wheelchair according to claim 28 is characterized in that: the foldable wheelchair also includes an armrest structure, and the controller is arranged on the armrest structure. The foldable wheelchair according to claim 29 is characterized in that the armrest structure is the wheelchair armrest structure according to any one of claims 1 to 8.