CN112674954A

CN112674954A - Foldable wheelchair

Info

Publication number: CN112674954A
Application number: CN202110088398.9A
Authority: CN
Inventors: 吴焘; 陈向阳
Original assignee: Zhejiang Aceme Electric Co ltd
Current assignee: Zhejiang Aceme Electric Co ltd
Priority date: 2021-01-22
Filing date: 2021-01-22
Publication date: 2021-04-20

Abstract

The invention provides a foldable wheelchair, which comprises a wheelchair frame and other parts, wherein the wheelchair frame comprises a seat support, a front wheel support, a rear wheel support, a connecting rod, a backrest support and an armrest support, the front part of the seat support extends along the horizontal direction, the rear part of the seat support extends obliquely backwards and downwards, the front wheel support extends upwards and backwards, the upper end part of the front wheel support is rotatably connected with the upper end part of the front wheel support, the middle part of the upper end part of the front wheel support is rotatably connected with the rear end part of the seat support, the rear wheel support is rotatably connected with the upper end part of the rear wheel support, the armrest support is rotatably connected with the seat support and the backrest support respectively, the front wheel support, the rear wheel support, the seat support and the connecting rod form a first four-bar mechanism, the seat support, the rear wheel support, the backrest support and the armrest support form a second four-bar mechanism, and the wheelchair frame locking mechanism only needs to, The locking of the wheelchair frame can be realized by the relative position of the rear wheel bracket, and the wheelchair frame has the advantages of ingenious conception, simple structure and convenient operation.

Description

Foldable wheelchair

Technical Field

The invention belongs to the field of medical instruments, and particularly relates to a foldable wheelchair.

Background

In the process of treating and recovering patients, particularly for patients who cannot walk independently, the wheelchair mode is usually adopted to replace walking, so that the patients can be treated and recovered well, and the daily life of the patients is facilitated.

Most of the existing wheelchairs are not foldable and inconvenient to store, and although some wheelchairs are also partially foldable, most of the wheelchairs are complex in structure, so that the control mode of a locking mechanism is also complex, and the wheelchairs are inconvenient to fold and unfold.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a foldable wheelchair which is ingenious in conception, simple in structure and convenient to operate.

In order to achieve the above object, the present invention adopts a technical solution that a foldable wheelchair includes a wheelchair frame having an unfolded and folded state, a wheel assembly located at a bottom of the wheelchair frame, a driving assembly for driving the wheel assembly to rotate, and a wheelchair frame locking mechanism for locking the wheelchair frame in the unfolded state, the wheelchair frame including:

a seat support, the front part of which extends along the horizontal direction, and the rear part of which extends obliquely backwards and downwards;

a front wheel bracket extending obliquely from a front lower side to a rear upper side;

the upper end part of the rear wheel bracket is rotationally connected with the upper end part of the front wheel bracket, and the middle part of the rear wheel bracket is rotationally connected with the rear end part of the seat bracket;

a connecting rod, the lower end of which is rotatably connected with the lower end of the front wheel bracket, and the upper end of which is rotatably connected with the front end of the seat bracket, so that the front wheel bracket, the rear wheel bracket, the seat bracket and the connecting rod form a first four-bar linkage;

the lower end part of the backrest bracket is rotatably connected with the upper end part of the rear wheel bracket;

the front part of the armrest support extends obliquely forwards and downwards, the rear part of the armrest support extends along the horizontal direction, the front end part of the armrest support is rotatably connected with the front end part of the seat support, and the rear end part of the armrest support is rotatably connected with the middle part of the backrest support, so that the seat support, the rear wheel support, the backrest support and the armrest support form a second four-bar linkage mechanism;

the wheelchair frame locking mechanism enables the wheelchair frame to be locked in a unfolded state by locking the relative positions of the front wheel support and the rear wheel support, the wheelchair frame locking mechanism comprises a locking hole and a locking block, the locking hole comprises a first locking hole arranged at the upper end part of the front wheel support and a second locking hole arranged at the upper end part of the rear wheel support, the first locking hole is aligned with the second locking hole, the locking block can be arranged in the locking hole in a left-right sliding mode, the outer wall of the locking block and the inner wall of the locking hole are provided with concave-convex matching structures, when the wheelchair frame locking mechanism is in a locked state, the locking block is simultaneously positioned in the first locking hole and the second locking hole, and the relative positions of the front wheel support and the rear wheel support are locked; when the wheelchair frame locking mechanism is in an unlocked state, the locking blocks are all positioned in the second locking holes, so that the front wheel support and the rear wheel support can rotate relatively.

Preferably, the front end portion of the armrest support, the upper end portion of the link, and the front end portion of the seat support share a first rotation axis, and the lower end portion of the backrest support, the upper end portion of the front wheel support, and the upper end portion of the rear wheel support share a second rotation axis, so that the wheelchair frame is more compact in structure and more highly-appreciated.

Further preferably, the wheelchair frame locking mechanism further comprises an unlocking handle and a first spring, the unlocking handle is rotatably connected to the upper end portion of the front wheel support through the second rotating shaft, the end portion of the unlocking handle extends into the first locking hole and is located on the opposite side of the locking block, when the unlocking handle rotates relative to the front wheel support, the locking block can be pushed to slide towards the second locking hole, the wheelchair frame locking mechanism is changed to an unlocking state, the first spring is arranged in the first locking hole, the two end portions of the first spring respectively abut against the bottom wall of the first locking hole and the side wall of the locking block, the first spring has a tendency of driving the wheelchair frame locking mechanism to be changed to a locking state, and thus most of moving parts of the wheelchair frame locking mechanism can be located in the locking hole, the exposed unlocking handle is simple and attractive in appearance and strong in high-grade sense, the service life of the wheelchair frame locking mechanism can be prolonged, clamping injury to a user can be prevented, and the safety is better.

Preferably, be provided with height-adjustable's handrail on the handrail support, the handrail includes handrail board and backup pad, handrail board with the rear portion of handrail support parallels, the upper end of backup pad is connected the bottom of handrail board, wear to establish to be located under the lower tip slidable of backup pad in the mounting hole of the front portion of handrail support, the extending direction of backup pad with the extending direction of the front portion of handrail support coincides mutually, sets up the hand elbow that can bear the user like this to adapt to the user of different heights, thereby promote this collapsible wheelchair's commonality and riding comfort.

Further preferably, the armrest support is further provided with an armrest locking mechanism for locking the height of the armrest, the armrest locking mechanism is a one-way locking mechanism, and when the armrest locking mechanism is in a locked state, the support plate can slide forward and downward and cannot slide backward and upward, or the support plate can slide backward and upward and cannot slide forward and downward; when handrail locking mechanical system is in the unblock state, the backup pad can slide to the front below and can slide to the back top again, sets up like this and can make things convenient for user's operation, and has very strong senior sense.

Further preferably, the armrest locking mechanism includes a locking member horizontally slidably disposed at a rear portion of the armrest support, a portion of the locking member protruding downward from a bottom surface of the armrest support to form a grip portion, a locking groove opened at a rear surface of the support plate, the locking groove having at least two locking grooves disposed at intervals in an extending direction of the support plate, the locking member having a first operating position and a second operating position, wherein when the locking member is at the first operating position, a front end portion of the locking member extends into the mounting hole and is inserted into the locking groove to lock the armrest locking mechanism, and when the locking member is at the second operating position, the locking member is disengaged from the locking groove to unlock the armrest locking mechanism, and a second spring disposed at the rear portion of the armrest support, the second spring has and orders about the locking piece to the gliding trend of first operating position, the benefit that sets up like this lies in for the adjusting part of all handrail plate heights all sets up in the mounting hole, and the reliability is high, long service life, and difficult clamp injures the user, and the security is better.

Further preferably, the front end portion of the locking piece has a first inclined plane, an included angle between the first inclined plane and the horizontal plane is an acute angle, the inner wall of the locking groove is provided with a second inclined plane matched with the first inclined plane, when the locking piece is located at the first working position, the first inclined plane and the second inclined plane are attached to each other.

Further preferably, the drive assembly includes a motor, a battery and a controller, the motor is arranged on the wheel assembly for driving the wheel assembly to rotate, the battery is arranged under a seat plate erected at the front part of the seat support, the battery is used for providing power for the motor, the controller is used for controlling the rotation of the motor, and the controller is arranged at the front end part of the armrest plate.

Further preferably, first inclined plane with all be provided with the electrode on the second inclined plane, the electrode is established ties on the control circuit of controller first inclined plane with when the second inclined plane was laminated mutually, the electrode switches on control circuit, the controller can be controlled the motor rotates, sets up like this and can avoid the user to bump the potential safety hazard that the controller caused by the mistake when adjusting handrail board height, and has very strong senior sense.

Further preferably, the angle between the extending direction of the front part of the armrest support and the horizontal direction is 50-70 °.

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

the invention provides a foldable wheelchair comprising: the wheelchair frame that has expansion and folded state, be located the wheel subassembly of wheelchair frame bottom, be used for driving the rotatory drive assembly of wheel subassembly, be used for with the wheelchair frame locking mechanical system of wheelchair frame locking in the expansion state, the wheelchair frame includes: a seat support with the front part extending along the horizontal direction and the rear part extending obliquely towards the rear lower part, a front wheel support with the upper end part rotatably connected with the upper end part of the front wheel support and the middle part rotatably connected with the rear end part of the seat support, a connecting rod, a backrest support with the lower end part rotatably connected with the upper end part of the rear wheel support, and an armrest support, wherein the two end parts of the connecting rod are respectively rotatably connected with the front wheel support and the seat support, so that the two end parts of the armrest support are respectively rotatably connected with the seat support and the backrest support, so that the front wheel support, the rear wheel support, the seat support and the connecting rod form a first four-bar mechanism, the seat support, the rear wheel support, the backrest support and the armrest support form a second four-bar mechanism, the two four-bar mechanisms share the rear wheel support and the seat support, and the wheelchair frame locking mechanism can lock the wheelchair frame in an unfolded state only by locking the relative positions of the front wheel support and the rear wheel support, ingenious design, simple structure and convenient operation.

Drawings

Fig. 1 is a schematic perspective view of a preferred embodiment of the present invention.

Figure 2 is a side view of figure 1 with the wheelchair frame in a deployed condition.

Fig. 3 is a side view of the chair of fig. 1 during the transition from the unfolded position to the folded position.

Figure 4 is a side view of figure 1 with the wheelchair frame in a folded condition.

Fig. 5 and 6 are exploded and enlarged perspective views of the locking mechanism of the wheelchair frame shown in fig. 2.

Fig. 7 is an enlarged schematic view, partially in section, of the armrest assembly of fig. 2.

Wherein: 10. a wheelchair frame; 11. a seat support; 111. a seat; 12. a front wheel bracket; 13. a rear wheel support; 14. a connecting rod; 15. a backrest support; 16. a handrail support; 161. a handrail plate; 162. a support plate; 163. mounting holes; 164. an armrest locking mechanism; 1641. a locking member; 1641a. handle part; 1641b. a first inclined plane; 1642. a locking groove; 1642b. a second inclined plane; 1643. a second spring; 17. a foot pedal; 18. a first rotating shaft; 19. a second rotating shaft; 21. a front wheel assembly; 22. a rear wheel assembly; 31. a motor; 32. a battery; 33. a controller; 40. a wheelchair frame locking mechanism; 411. a first locking hole; 412. a second locking hole; 42. a locking block; 43. a concave-convex matching structure; 44. unlocking the handle; 45. a first spring; 46. a limiting device; 461. a limiting groove; 462. a limiting block; 47. a transmission device; 471. a top block; 471a, circular ring portion; 471b, a boss; 472. a bevel; 4721. an arc-shaped hole.

Detailed Description

The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.

The front-rear direction, the left-right direction, and the up-down direction described in the present invention are based on the front-rear direction, the left-right direction, and the up-down direction as viewed by an occupant when riding the foldable wheelchair provided by the present invention, and specifically, the up-down direction described in the present invention refers to the up-down direction in fig. 2, the front-rear direction described in the present invention refers to the left-right direction in fig. 2, and the left-right direction described in the present invention refers to the inside-outside direction in fig. 2.

The invention will be further described with reference to examples of embodiments shown in the drawings to which the invention is attached.

As shown in fig. 1 to 4, the present invention provides a foldable wheelchair including a wheelchair frame 10 having an unfolded and folded state, a wheel assembly provided at the bottom of the wheelchair frame 10, a driving assembly for driving the wheel assembly to rotate, a wheelchair frame locking mechanism 40 for locking the wheelchair frame 10 in the unfolded state; the wheelchair frame 10 includes: the seat comprises a seat support 11, a front wheel support 12, a rear wheel support 13, a connecting rod 14, a backrest support 15, an armrest support 16 and a pedal plate 17, wherein the front part of the seat support 11 extends along the horizontal direction, and the rear part of the seat support 11 extends obliquely towards the rear lower part; the front wheel bracket 12 extends obliquely from the front lower side to the rear upper side; the upper end part of the rear wheel bracket 13 is rotationally connected with the upper end part of the front wheel bracket 12, and the middle part of the rear wheel bracket 13 is rotationally connected with the rear end part of the seat bracket 11; the lower end part of the connecting rod 14 is rotatably connected with the lower end part of the front wheel bracket 12, the upper end part of the connecting rod 14 is rotatably connected with the front end part of the seat bracket 11, so that the front wheel bracket 12, the rear wheel bracket 13, the seat bracket 11 and the connecting rod 14 form a first four-bar linkage; the lower end part of the backrest bracket 15 is rotationally connected with the upper end part of the rear wheel bracket 13; the front part of the armrest support 16 extends obliquely forwards and downwards, the rear part of the armrest support 16 extends along the horizontal direction, the front end part of the armrest support 16 is rotatably connected with the front end part of the seat support 11, and the rear end part of the armrest support 16 is rotatably connected with the middle part of the backrest support 15, so that the seat support 11, the rear wheel support 13, the backrest support 15 and the armrest support 16 form a second four-bar linkage; the locking and unlocking of the wheelchair frame 10 can be realized by only controlling one of the four-bar linkage mechanisms, and the wheelchair frame has the advantages of ingenious conception, simple structure and convenient operation.

In the present embodiment, the front end portion of the armrest support 16, the upper end portion of the connecting rod 14, and the front end portion of the seat support 11 share the first pivot shaft 18, and the lower end portion of the backrest support 15, the upper end portion of the front wheel support 12, and the upper end portion of the rear wheel support 13 share the second pivot shaft 19, so that the wheelchair frame 10 is more compact in structure and more highly comfortable.

As shown in fig. 5 to 6, the wheelchair frame locking mechanism 40 locks the wheelchair frame 10 in the unfolded state by locking the relative positions of the front wheel carrier 12 and the rear wheel carrier 13, the wheelchair frame locking mechanism 40 includes a locking hole 411 provided at the upper end of the front wheel carrier 12 and a second locking hole 412 provided at the upper end of the rear wheel carrier 13, the first locking hole 411 and the second locking hole 412 are aligned, the locking block 42 is slidably provided in the locking hole in the left and right directions, the outer wall of the locking block 42 and the inner wall of the locking hole are provided with a concave-convex fitting structure 43, when the wheelchair frame locking mechanism 40 is in the locked state, the locking block 42 is simultaneously located in the first locking hole 411 and the second locking hole 412 to lock the relative positions of the front wheel carrier 12 and the rear wheel carrier 13 to lock the wheelchair frame 10, which locking includes both locking when the wheelchair frame 10 is in the unfolded state, also including locking of the wheelchair frame 10 in the folded position, this arrangement has the advantage that the wheelchair frame 10 also has a strong stability in the folded position; when the wheelchair frame locking mechanism 40 is in the unlocked state, the locking blocks 42 are all located in the second locking holes 412, so that the front wheel brackets 12 and the rear wheel brackets 13 can be relatively rotated, and the wheelchair frame 10 can be changed to the unfolded state or the folded state.

The wheelchair frame locking mechanism further comprises an unlocking handle 44 and a first spring 45, the unlocking handle 44 is rotatably connected to the upper end portion of the front wheel support 12 through the second rotating shaft 19, the end portion of the unlocking handle 44 extends into the first locking hole 411 and is positioned on the opposite side of the locking block 42, when the unlocking handle 44 rotates relative to the front wheel support 12, the locking block 42 can be pushed to slide towards the second locking hole 412, the wheelchair frame locking mechanism 40 is changed to an unlocking state, the first spring 45 is arranged in the first locking hole 411, two end portions of the first spring 45 respectively abut against the bottom wall of the first locking hole 411 and the side wall of the locking block 42, the first spring 45 has a tendency of driving the wheelchair frame locking mechanism 40 to be changed to a locking state, so that most of moving parts of the wheelchair frame locking mechanism 40 are positioned in the locking holes, the unlocking handle 44 is only exposed outside, the appearance is simple and beautiful, the high-grade feeling is strong, the service life of the wheelchair frame locking mechanism 40 can be prolonged, clamping injury to a user can be prevented, and the safety is better.

The wheelchair frame locking mechanism 40 further comprises a limiting device 46 and a transmission device 47, the limiting device 46 is used for limiting the rotation angle of the unlocking handle 44, the limiting device 46 is positioned on one side of the second rotation shaft 19, the limiting device 46 comprises a limiting groove 461 arranged at the end part of the unlocking handle 44 and a limiting block 462 arranged on the inner wall of the second locking hole 412, the limiting groove 461 is an arc-shaped groove and is positioned in the second locking hole 412, the center of the limiting groove 461 is positioned on the second rotation shaft 19, the limiting block 462 extends into the limiting groove 461, when the unlocking handle 44 rotates relative to the front wheel support 12, the limiting block 462 moves in the limiting groove 461, when the unlocking handle 44 rotates to the limit position, the limiting block 462 abuts against the side wall of the limiting groove 461, and the unlocking handle 44 cannot rotate continuously to play a limiting role; transmission 47 is used for turning into the left and right sides of locking block 42 with the rotation of unblock handle 44, specifically, transmission 47 includes kicking 471 and inclined plane 472, kicking 471 includes ring portion 471a, set up projection 471b on ring portion 471a, the tip of unblock handle 44 is provided with the arc hole 4721 that is used for holding projection 471b, the bottom surface of arc hole 4721 is inclined plane 472, inclined plane 472 is withstood to the tip of projection 471b, when unblock handle 44 rotates for front wheel support 12, inclined plane 472 drives projection 471b and moves about, thereby turn into the left and right sides of locking block 42 with the rotation of unblock handle 44.

In the present embodiment, as shown in fig. 1 and 7, the armrest support 16 is provided with a height-adjustable armrest, the armrest includes an armrest plate 161 and a support plate 162, the armrest plate 161 is parallel to the rear portion of the armrest support 16, the upper end portion of the support plate 162 is connected to the bottom of the armrest plate 161, the lower end portion of the support plate 162 is slidably inserted into a mounting hole 163 located at the front portion of the armrest support 16, and the extending direction of the support plate 162 coincides with the extending direction of the front portion of the armrest support 16, so that the armrest support can support the elbow of the user and is suitable for users with different heights, thereby improving the versatility and riding comfort of the foldable wheelchair.

The armrest support 16 is further provided with an armrest locking mechanism 164 for locking the height of the armrest, the armrest locking mechanism 164 is a one-way locking mechanism, and when the armrest locking mechanism 164 is in a locked state, the support plate 162 can slide back and forth and cannot slide back and forth; when the armrest locking mechanism 164 is in the unlocked state, the support plate 162 can slide both forward and downward and rearward and upward, which facilitates the operation of the user and provides a strong sense of sophistication.

The handle locking mechanism 164 includes a locking member 1641, a locking groove 1642 and a second spring 1643, the locking member 1641 is horizontally slidably disposed at a rear portion of the handle support 16, a portion of the locking member 1641 protrudes downward from a bottom surface of the handle support 16 to form a pull portion 1641a, the locking groove 1642 is opened at a rear surface of the support plate 162, two locking grooves 1642 are provided, the two locking grooves 1642 are spaced apart from each other in an extending direction of the support plate 162, the locking member 1641 has a first operating position and a second operating position, when the locking member 1641 is at the first operating position, a front end portion of the locking member 1641 extends into the mounting hole 163 and is inserted into the locking groove 1642 to lock the handle locking mechanism 164, when the locking member 1641 is at the second operating position, the locking member 1641 is disengaged from the locking groove 1642, the second spring 1643 is disposed at a rear portion of the handle support 16, the second spring 1643 has a tendency to urge the locking member 1641 to slide toward the, the advantage of setting up like this for all handrail boards 161 height adjusting part all sets up in mounting hole 163, and the reliability is high, long service life, and difficult the clamping wound user, and the security is better.

The front end of the locking piece 1641 is provided with a first inclined plane 1641b, an included angle between the first inclined plane 1641b and the horizontal plane is an acute angle, the inner wall of the locking groove 1642 is provided with a second inclined plane 1642b matched with the first inclined plane 1641b, and when the locking piece 1641 is located at a first working position, the first inclined plane 1641b and the second inclined plane 1642b are attached to each other.

The driving assembly comprises a motor 31, a battery 32 and a controller 33, wherein the motor 31 is arranged on the wheel assembly and used for driving the wheel assembly to rotate, the battery 32 is arranged under a seat plate 111 erected at the front part of the seat support 11, the battery 32 is used for providing power for the motor 31, the controller 33 is used for controlling the rotation of the motor 31, and the controller 33 is arranged at the front end part of the armrest plate 161.

All be provided with the electrode on first inclined plane 1641b and the second inclined plane 1642b, the electrode is established ties on the control circuit of controller 33, and when first inclined plane 1641b and second inclined plane 1642b laminated, the electrode switches on control circuit, and controller 33 can control motor 31 and rotate, sets up like this and can avoid the user to bump the potential safety hazard that controller 33 caused by mistake when adjusting handrail board 161 height, and has very strong senior sense.

The front part of the armrest support 16 and the support plate 162 extend obliquely forward and downward to drive the armrest plate 161 to move forward and backward to adapt to users with different sizes and different arm lengths when the height of the armrest plate 161 is adjusted, and the angle between the extending direction of the front part of the armrest support 16 and the support plate 162 and the horizontal direction is preferably 50-70 degrees, and in the embodiment, the angle is 63 degrees.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. Foldable wheelchair, including having the wheelchair frame of expansion and fold condition, be located the wheel subassembly of wheelchair frame bottom, be used for driving the pivoted drive assembly of wheel subassembly, be used for with the wheelchair frame locking mechanical system of wheelchair frame locking at the expansion condition, its characterized in that, the wheelchair frame includes:

2. The foldable wheelchair as recited in claim 1, wherein: the front end of the armrest support, the upper end of the connecting rod, and the front end of the seat support share a first rotating shaft, and the lower end of the backrest support, the upper end of the front wheel support, and the upper end of the rear wheel support share a second rotating shaft.

3. The foldable wheelchair as recited in claim 2, wherein: wheelchair frame locking mechanical system still includes unblock handle and first spring, the unblock handle passes through the second axis of rotation is rotationally connected the upper end of front wheel support, the tip of unblock handle stretches into in the first locking hole and be located the opposite side of locking piece unblock handle for when the front wheel support rotates, can promote the locking piece to the second locking hole slides, makes wheelchair frame locking mechanical system changes to the unblock state, first spring sets up in the first locking hole, the both ends of first spring are supported tightly respectively the diapire in first locking hole with on the lateral wall of locking piece, first spring has the trend of ordering about wheelchair frame locking mechanical system changes to the locking state.

4. The foldable wheelchair as recited in claim 1, wherein: the handrail support is provided with a height-adjustable handrail, the handrail comprises a handrail plate and a supporting plate, the handrail plate is parallel to the rear portion of the handrail support, the upper end portion of the supporting plate is connected to the bottom of the handrail plate, the lower end portion of the supporting plate is slidably arranged in a mounting hole in the front portion of the handrail support in a penetrating mode, and the extending direction of the supporting plate coincides with the extending direction of the front portion of the handrail support.

5. The foldable wheelchair as recited in claim 4, wherein: the armrest support is also provided with an armrest locking mechanism for locking the height of the armrest, the armrest locking mechanism is a one-way locking mechanism, and when the armrest locking mechanism is in a locking state, the support plate can slide forwards and downwards and cannot slide backwards and upwards, or the support plate can slide backwards and upwards and cannot slide forwards and downwards; when the armrest locking mechanism is in the unlocked state, the support plate can slide both forward and downward and rearward and upward.

6. The foldable wheelchair as recited in claim 4, wherein: the armrest locking mechanism comprises a locking piece, a locking groove and a second spring, wherein the locking piece is horizontally and slidably arranged at the rear part of the armrest support, one part of the locking piece protrudes downwards from the bottom surface of the armrest support to form a handle part, the locking groove is arranged on the rear surface of the support plate and is at least two, the two locking grooves are arranged at intervals along the extending direction of the support plate, the locking piece is provided with a first working position and a second working position, when the locking piece is arranged at the first working position, the front end part of the locking piece extends into the mounting hole and is inserted into the locking groove, so that the armrest locking mechanism is locked, when the locking piece is arranged at the second working position, the locking piece is separated from the locking groove, so that the armrest locking mechanism is unlocked, and the second spring is arranged at the rear part of the armrest support, the second spring has a tendency to urge the locking member to slide toward the first operating position.

7. The foldable wheelchair as recited in claim 6, wherein: the front end portion of locking piece has first inclined plane, contained angle between first inclined plane and the horizontal plane is the acute angle, be provided with on the inner wall of locking groove with first inclined plane assorted second inclined plane when the locking piece is in first operating position, first inclined plane with the second inclined plane is laminated mutually.

8. The foldable wheelchair as recited in claim 7, wherein: the drive assembly comprises a motor, a battery and a controller, the motor is arranged on the wheel assembly and used for driving the wheel assembly to rotate, the battery is arranged under a seat plate arranged at the front part of the seat support, the battery is used for providing power for the motor, the controller is used for controlling the rotation of the motor, and the controller is arranged at the front end part of the armrest plate.

9. The foldable wheelchair as recited in claim 8, wherein: the first inclined plane and the second inclined plane are both provided with electrodes, the electrodes are connected in series on a control circuit of the controller, when the first inclined plane and the second inclined plane are attached to each other, the electrodes are conducted on the control circuit, and the controller can control the motor to rotate.

10. The foldable wheelchair as recited in any one of claims 1-9, wherein: the included angle between the extending direction of the front part of the handrail support and the horizontal direction is 50-70 degrees.