CN210301464U

CN210301464U - Foldable wheelchair

Info

Publication number: CN210301464U
Application number: CN201920672211.8U
Authority: CN
Inventors: 吴焘; 唐良振; 杨磊
Original assignee: Nanjing Kangni Intelligent Technology Co ltd
Current assignee: Nanjing Kangni Intelligent Technology Co ltd
Priority date: 2019-05-10
Filing date: 2019-05-10
Publication date: 2020-04-14
Anticipated expiration: 2029-05-10

Abstract

The utility model relates to a collapsible wheelchair, including setting up in the collateral branch frame of the left and right sides, the transverse connection pole, the collateral branch frame of homonymy includes: a backrest support; a front wheel bracket rotatably connected with the backrest bracket; a rear wheel bracket rotatably connected to the backrest bracket; a pull rod rotatably connected with the front and rear wheel brackets; a seat post rotatably connected to the back support; the seat rod supporting rod is rotatably connected with the seat rod and the front wheel bracket; a foot bar rotatably connected to the backrest support; the sliding piece is slidably sleeved on the pedal rod in the front-back direction of the pedal rod and is rotatably connected with the front wheel support, the front end part of the pull rod is rotatably connected with the sliding piece, and the rotating shaft which is rotatably connected, the front end part of the pull rod and the rotating shaft which is rotatably connected with the front wheel support are the same rotating shaft. The utility model discloses both simplified the structure of wheelchair, folded folding relative current wheelchair volume is littleer for structural more optimization of wheelchair, and make the wheelchair open operating condition under more stable.

Description

Foldable wheelchair

Technical Field

The utility model relates to a wheelchair, in particular to a foldable wheelchair.

Background

The wheelchair is an important mobile tool for the rehabilitation, turnover transportation, treatment and outgoing activities of wounded persons, patients and disabled persons at home, not only meets the requirements of physically disabled persons and persons with mobility disabilities for riding instead of walking, but also is more important to facilitate the family members to move and take care of the patients, so that the patients can do physical exercises and participate in social activities by means of the wheelchair.

The folding wheelchair is a structure which can be unfolded when in use and folded when not in use so as to be convenient for storage and transportation. A folding wheelchair, filed by the applicant under application No. 201820340780.8, is disclosed comprising a backrest support, a front wheel support, a rear wheel support, a drawbar, a seat bar support bar, a foot bar, a slider, side rails, a handle, and a frame locking mechanism. Wherein: the backrest bracket extends upwards to form a push handle rod; the rear end part of the front wheel bracket is rotatably connected with the backrest bracket; the upper end part of the rear wheel bracket is rotatably connected with the lower part of the backrest bracket, and the rotatable connection part is positioned below the rotatable connection part of the front wheel bracket and the backrest bracket; the front end part of the pull rod is rotatably connected with the front wheel bracket, and the rear end part of the pull rod is rotatably connected with the rear wheel bracket; the rear end part of the seat post is rotatably connected with the backrest bracket, and the rotatable connection part is positioned above the rotatable connection part of the front wheel bracket and the backrest bracket; the upper end part of the seat post supporting rod is rotatably connected with the front part of the seat post, and the lower end part of the seat post supporting rod is rotatably connected with the middle part of the front wheel bracket; the rear end part of the foot bar is rotatably connected with the backrest bracket, and the rotatable connection position is positioned below the rotatable connection position of the rear wheel bracket and the backrest bracket; the sliding piece is slidably sleeved on the pedal rod along the front and back directions of the pedal rod and is also rotatably connected with the front part of the front wheel bracket; the rear end parts of the side armrests are rotatably connected with the backrest bracket, and the rotatable connection part is positioned above the rotatable connection part of the seat rod and the backrest bracket. When the wheelchair is used, the frame locking mechanism is unlocked, the backrest support rotates anticlockwise, the rear wheel support rotates clockwise, and the lifting and folding of the wheelchair are realized.

However, the sliding part is rotatably connected with the front wheel bracket through one rotating shaft, and the pull rod is rotatably connected with the front wheel bracket through the other rotating shaft, namely, the front wheel bracket is provided with a front rotating shaft and a rear rotating shaft, and on one hand, the two rotating points are arranged, so that the stability between the front wheel bracket and the pedal rod is insufficient; after folding, the front wheel bracket and the pedal rod cannot be further close under the influence of two turning points, and the volume is not small enough after folding; on the other hand, the structure is complicated and not simple enough.

Disclosure of Invention

The utility model aims at providing a collapsible wheelchair.

In order to achieve the above purpose, the utility model adopts the technical scheme that:

a foldable wheelchair comprises side brackets arranged on the left side and the right side, a transverse connecting rod arranged between the side brackets on the two sides and connected with the side brackets, front wheels arranged below the side brackets and rear wheels arranged below the side brackets; the side support has an opening working state and a folding working state, and the side support on the same side comprises:

the backrest bracket extends upwards to form a push handle rod;

the rear end part of the front wheel bracket is rotatably connected with the backrest bracket, and the front part of the front wheel bracket is provided with the front wheel;

the upper end part of the rear wheel bracket is rotatably connected with the lower part of the backrest bracket, the rotatable connection part is positioned below the rotatable connection part of the front wheel bracket and the backrest bracket, and the lower part of the rear wheel bracket is provided with the rear wheel;

the front end part of the pull rod is rotatably connected with the front wheel bracket, and the rear end part of the pull rod is rotatably connected with the rear wheel bracket;

the rear end part of the seat rod is rotatably connected with the backrest bracket, and the rotatable connection position is positioned above the rotatable connection position of the front wheel bracket and the backrest bracket;

the upper end part of the seat post supporting rod is rotatably connected with the front part of the seat post, and the lower end part of the seat post supporting rod is rotatably connected with the middle part of the front wheel bracket;

the rear end part of the foot bar is rotatably connected with the backrest bracket, and the rotatable connection position is positioned below the rotatable connection position of the rear wheel bracket and the backrest bracket;

the sliding piece is sleeved on the pedal rod in a sliding manner along the front and back directions of the pedal rod and is also rotatably connected with the front part of the front wheel bracket;

the front end part of the pull rod is also rotatably connected with the sliding piece, and the rotating shaft which is rotatably connected, the front end part of the pull rod and the rotating shaft which is rotatably connected with the front wheel bracket are the same rotating shaft.

Preferably, the foldable wheelchair further comprises a frame locking mechanism for locking the foldable wheelchair in the opening working state or the folding working state, and a frame unlocking operation piece for unlocking the frame locking mechanism, wherein when the frame locking mechanism is in the unlocking state, the side bracket can be switched between the opening working state and the folding working state.

Further preferably, the foldable wheelchair further comprises a slide lock mechanism disposed between the slide member and the foot bar, and a slide unlock operating member for unlocking the slide lock mechanism, wherein when the slide lock mechanism is in an unlocked state and the side frame is switched between the open operating state and the folded operating state, the slide member slides on the foot bar in the front-rear direction of the foot bar; when the sliding locking mechanism is in a locking state, the positions of the sliding piece and the pedal rod are relatively fixed.

Further preferably, the frame unlocking operation member and the sliding unlocking operation member are the same unlocking operation member, and the frame locking mechanism is unlocked while the sliding locking mechanism is unlocked.

Further preferably, the foldable wheelchair further comprises a handle, the handle is simultaneously and rotatably connected with the backrest bracket and the rear wheel bracket, and the handle is the unlocking operation piece.

Further preferably, the sliding locking mechanism comprises a locking assembly, the locking assembly comprises a locking groove formed on the pedal rod, a locking piece rotating shaft fixedly connected in the sliding piece, a locking piece rotatably connected on the locking piece rotating shaft, a locking tongue arranged on the locking piece and positioned on one side of the locking piece rotating shaft, and an elastic component arranged between the sliding piece and the locking tongue and used for driving the locking tongue to be inserted into the locking groove, and when the locking tongue is inserted into the locking groove, the sliding piece and the pedal rod are locked; when the sliding unlocking operation piece is operated, the locking piece rotates around the rotating shaft of the locking piece to enable the lock tongue to be separated from the lock groove, and the sliding piece and the pedal rod are unlocked.

Further preferably, the sliding locking mechanism further comprises an unlocking transmission assembly arranged between the locking assembly and the sliding unlocking operation member, the unlocking transmission assembly comprises a first transmission assembly matched with the sliding unlocking operation member and a second transmission assembly matched with the locking assembly, and the first transmission assembly and the second transmission assembly are connected through a traction cable.

Further preferably, the first transmission assembly comprises a first sliding block arranged in the pull rod in a sliding manner along the front-back direction, a pressing block connected to the first sliding block in a vertically moving manner, and a first reset piece arranged between the pull rod and the first sliding block and used for driving the first sliding block to reset, the first sliding block is provided with a chute, the pressing block is provided with a first transmission pin, the first transmission pin is arranged in the chute in a sliding manner, one end of the traction cable is connected with the first sliding block, the sliding unlocking operation piece is matched with the pressing block, when the sliding unlocking operation piece is operated, the pressing block moves up and down to drive the first sliding block to slide, and the traction cable pulls the second transmission assembly.

Further preferably, the second transmission assembly comprises a second sliding block arranged in the sliding block in a sliding manner along the front-back direction, a second transmission pin arranged on the second sliding block, and a second resetting member arranged between the sliding block and the second sliding block and used for driving the second sliding block to reset, wherein the other end of the traction cable is connected with the second sliding block; the locking piece be located locking piece pivot opposite side be provided with second driving pin cooperation portion, second driving pin cooperation portion orientation locking piece pivot one side be provided with along the back upper place and extend the cooperation inclined plane, the second driving pin support the cooperation inclined plane on, work as the haulage cable pulling the second slider slide, the second driving pin drive the locking piece wind the locking piece axis of rotation rotate.

Preferably, the foldable wheelchair further comprises side armrests, rear end portions of the side armrests are rotatably connected with the backrest support, and the rotatable connection is located above the rotatable connection between the seat post and the backrest support.

Because of the application of the technical scheme, compared with the prior art, the utility model has the following advantages:

the utility model discloses a merge the axis of rotation with slider and front wheel support, pull rod and front wheel support into one, both simplified the structure of wheelchair, folding relative current wheelchair volume is littleer for the structural optimization more of wheelchair, and make the wheelchair open operating condition under more stable.

Drawings

FIG. 1 is a first perspective view of the present embodiment;

FIG. 2 is a second perspective view of the present embodiment;

FIG. 3 is a schematic front view of the present embodiment in an open working state;

FIG. 4 is a schematic view of the joint connection of the rods in the open working state according to the present embodiment;

FIG. 5 is a schematic front view of the present embodiment in a semi-folded working state;

FIG. 6 is a schematic front view of the present embodiment in a folded working state;

FIG. 7 is a schematic perspective view of the frame locking mechanism of the present embodiment;

FIG. 8 is a schematic exploded view of FIG. 7;

FIG. 9 is a schematic front view of the frame locking mechanism of the present embodiment;

FIG. 10 is a schematic sectional view A-A of FIG. 9;

FIG. 11 is a schematic front view of the first transmission assembly of the present embodiment;

FIG. 12 is an enlarged view of portion B of FIG. 11;

FIG. 13 is a schematic top view of the locking assembly and the second transmission assembly of the present embodiment;

fig. 14 is an enlarged view of the portion C of fig. 13.

Wherein: 1. a backrest support; 10. a handle pushing rod; 11. a backrest rail; 12. a backrest joint; 2. a front wheel bracket; 3. a rear wheel support; 4. a pull rod; 5. a seat post; 6. a seat post support bar; 7. a foot lever; 8. a slider; 9. a side arm rest; 13. a carrying handle; 14. a frame locking mechanism; 140. a joint lock; 141. a tooth chamber; 142. a locking tooth; 1420. a second mating ramp; 143. an elastic member; 144. a first mating ramp; 150. locking the groove; 151. a locking member rotating shaft; 152. a locking member; 1520. a latch bolt; 1521. a second drive pin engagement portion; 1522. a mating bevel; 153. an elastic member; 154. a traction cable; 155. a first slider; 1550. a chute; 156. briquetting; 1560. a first drive pin; 157. A first reset member; 158. a second slider; 1580. a second drive pin; 159. a second reset member.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

A foldable wheelchair as shown in fig. 1-4, comprising side brackets arranged at the left and right sides, a transverse connecting rod arranged between the side brackets at the two sides and connected with the side brackets, a front wheel arranged below the side brackets, and a rear wheel arranged below the side brackets; the side branch frame has open operating condition and folding operating condition, and the side branch frame of homonymy includes:

the backrest support 1, the backrest support 1 extends upwards to form a push handle rod 10;

the rear end part of the front wheel bracket 2 is rotatably connected with the backrest bracket 1, and the front part of the front wheel bracket 2 is provided with a front wheel;

the upper end part of the rear wheel bracket 3 is rotatably connected with the lower part of the backrest bracket 1, the rotatable connection part c is positioned below the rotatable connection part b of the front wheel bracket and the backrest bracket, and the lower part of the rear wheel bracket 3 is provided with a rear wheel;

the front end part of the pull rod 4 is rotatably connected with the front wheel bracket 2, and the rear end part of the pull rod 4 is rotatably connected with the rear wheel bracket 3;

the rear end part of the seat rod 5 is rotatably connected with the backrest bracket 1, and the rotatable connection part a is positioned above the rotatable connection part b of the front wheel bracket 2 and the backrest bracket 1;

the upper end part of the seat post supporting rod 6 is rotatably connected with the front part of the seat post 5, and the lower end part of the seat post supporting rod 6 is rotatably connected with the middle part of the front wheel bracket 2;

the rear end part of the foot bar 7 is rotatably connected with the backrest bracket 1, and the rotatable connection part d is positioned below the rotatable connection part c of the rear wheel bracket 3 and the backrest bracket 1;

the sliding piece 8 is slidably sleeved on the pedal rod 7 along the front and back directions of the pedal rod 7, and the sliding piece 8 is further rotatably connected with the front part of the front wheel bracket 2;

and the rear end part of the side armrest 9 is rotatably connected with the backrest support 1, and the rotatable connection part is positioned above the rotatable connection part a of the seat post 5 and the backrest support 1.

The handle 13, the handle 13 and the backrest bracket 1 and the rear wheel bracket 3 are simultaneously and rotatably connected.

In this embodiment: the front end of the pull rod 4 is also rotatably connected to the slider 8, and the rotation axis of the rotatable connection, the front end of the pull rod 4 and the rotation axis of the rotatable connection of the front wheel bracket 2 are the same rotation axis o.

The folding wheelchair comprises two sets of locking mechanisms: a frame locking mechanism 14 for locking the folding wheelchair in the unfolded operation state or the folded operation state, a slide locking mechanism for locking the slide between the slider 8 and the foot rest lever 7, and a frame unlocking operation member for unlocking the frame locking mechanism 14 and a slide unlocking operation member for unlocking the slide locking mechanism. In this embodiment: the frame unlocking operation member 11 and the sliding unlocking operation member are the same unlocking operation member, namely a handle 13, namely: the folding wheelchair can be switched from the unfolded working state to the folded working state by rotating the handle 13 to unlock the frame locking mechanism and simultaneously unlock the sliding locking mechanism.

The backrest support 1 specifically comprises a push handle rod 10, a backrest cross rod 11 and a backrest joint 12. The push handle rod 10 is U-shaped, the backrest joints 12 are respectively connected with two ends of the push handle rod 10, the backrest cross rod 11 is connected between the backrest joints 12, and the frame locking mechanism 14 is arranged on the backrest cross rod 11 and is rotationally connected with the rear wheel bracket 3 and the carrying handle 13 through a rotating point c.

As shown in fig. 7-10: the frame locking mechanism 14 comprises a joint lock 140 arranged on the backrest cross bar 11, a tooth cavity 141 formed on the rear wheel bracket 3, a locking tooth 142 which can be simultaneously positioned in the joint lock 140 and the tooth cavity 141, and an elastic part 143 with two ends respectively abutted between the tooth cavity 141 and the locking tooth 142, wherein the carrying handle 13 penetrates through the joint lock 140 and is matched with the locking tooth 142. Wherein: the first engaging slant 144 is provided on the handle 13, the second engaging slant 1420 is provided on the locking tooth 142, and the first engaging slant 144 of the handle 13 is slidably engaged with the second engaging slant 1420 of the locking tooth 142. The elastic member 143 is a compression spring.

When the wheelchair is in the unfolded working state or the folded working state, the locking teeth 142 are simultaneously positioned in the joint lock 140 and the tooth cavity 141 due to the action of the elastic member 143, and the rear wheel bracket 3 and the backrest bracket 1 are locked. When the frame locking mechanism 14 is unlocked, the lifting handle 13 is rotated, the first matching inclined surface 144 of the lifting handle 13 and the second matching inclined surface 1420 of the locking tooth 142 slide relatively, the locking tooth 142 positioned in the joint lock 140 is pushed out of the joint lock 140, the elastic component 143 is pressed, and the rear wheel bracket 3 and the backrest bracket 1 can rotate relatively; when the knuckle lock 140 is rotated to a certain angle, the elastic member 143 pushes the locking teeth 142 into the knuckle lock 140, and the frame locking mechanism 14 is locked. The applicant has filed a separate patent application for the specific construction of the frame locking mechanism 14 and will not be described in detail herein.

As shown in fig. 11-14: the slide lock mechanism includes a lock assembly, an unlock transmission assembly disposed between the lock assembly and the carrying handle 13. Wherein:

the locking assembly includes a locking groove 150 formed on the pedal tube 7, a locking member rotating shaft 151 fixedly coupled in the slider 8, and a locking member 152 rotatably coupled to the locking member rotating shaft 151. The locking member 152 is provided with a locking tongue 1520 at the front side of the locking member rotating shaft 151, a second transmission pin fitting portion 1521 at the rear side of the locking member rotating shaft 151, and a fitting inclined surface 1522 extending along the upper rear direction is provided at the second transmission pin fitting portion 1521 toward one side (front side) of the locking member rotating shaft 151. The locking assembly further includes a resilient member 153 disposed between the slider 8 and the locking tongue 1520 to urge the locking tongue 1520 into the locking slot 150.

The unlocking transmission assembly comprises a first transmission assembly matched with the carrying handle 13 and a second transmission assembly matched with the locking assembly, and the first transmission assembly and the second transmission assembly are connected through a traction cable 154.

The first transmission assembly includes a first slider 155 slidably disposed in the pull rod 4 in the front-rear direction, a pressing block 156 connected to the first slider 155 movably in the up-down direction, and a first restoring member 157 disposed between the pull rod 4 and the first slider 155 for restoring the first slider 155. Wherein: the pressing block 156 is exposed out of the pull rod 4 and can be contacted with the lifting handle 13; the first slider 155 is provided with an inclined groove 1550, the pressing block 156 is provided with a first transmission pin 1560, the first transmission pin 1560 is slidably arranged in the inclined groove 1550, and one end of the traction cable 154 is connected with the first slider 155.

The second driving assembly includes a second sliding block 158 slidably disposed in the sliding member 8 in a front-back direction, a second driving pin 1580 disposed on the second sliding block 158, and a second restoring member 159 disposed between the sliding member 8 and the second sliding block 158 for restoring the second sliding block 158, wherein the other end of the pulling cable 154 is connected to the second sliding block 158, and the second driving pin 1580 abuts against the matching inclined surface 1522 of the locking member 152.

The elastic member 153, the first restoring member 157, and the second restoring member 159 are compression springs.

When the wheelchair is switched from the opening working state to the folding working state, the lifting handle 13 is rotated, the lifting handle 13 rotates by a certain angle to be in contact with the pressing block 156 and press down the pressing block 156, the pressing block 156 moves downwards to drive the first sliding block 155 to slide backwards, the traction cable 154 pulls backwards, and the first resetting piece 157 compresses for energy storage; the second slider 158 compresses the second restoring member 159 to slide backwards under the pulling of the pulling cable 154, and the second driving pin 1580 pulls the locking member 152 to rotate the locking member 152 around the locking member rotating shaft 151 to disengage the latch tongue 1520 from the latch groove 150, so as to unlock the slider 8 and the pedal lever 7.

When the wheelchair is switched from the folding working state to the opening working state, the lifting handle 13 is separated from the pressing block 156, the first sliding block 155 slides forwards under the action of the first resetting piece 157, and the traction cable 154 is released forwards; the second slider 158 slides forward under the action of the second restoring member 159, and at the same time, the elastic member 153 continuously acts on the latch 1520, and when the latch 1520 is unfolded to the proper position, the latch 1520 is inserted into the latch slot 150, and the slider 8 and the foot lever 7 are locked.

After the frame locking mechanism and the sliding locking mechanism are unlocked, the carrying handle 13 is continuously rotated, the backrest support 1 rotates forwards around the rotating point b, the backrest support 1, the seat post 5 and the rear wheel support 3 are closed with the front wheel support 2 forwards, and the pedal tube 7 slides backwards along the sliding piece 8 to retract, so that the whole wheelchair is folded, as shown in fig. 5 and 6.

When the wheelchair is opened, the handle 13 is rotated, the frame locking mechanism is unlocked, the backrest support 1 is lifted backwards, the seat post 5 and the rear wheel support 3 move in the direction far away from the front wheel support 2, meanwhile, the pedal tube 1 slides and extends along the sliding piece 8 until the frame locking mechanism and the sliding locking mechanism are completely opened and locked.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot 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 by the protection scope of the present invention.

Claims

1. A foldable wheelchair comprises side brackets arranged on the left side and the right side, a transverse connecting rod arranged between the side brackets on the two sides and connected with the side brackets, front wheels arranged below the side brackets and rear wheels arranged below the side brackets; the side support has an opening working state and a folding working state, and the side support on the same side comprises:

the backrest bracket extends upwards to form a push handle rod;

the method is characterized in that: the front end part of the pull rod is also rotatably connected with the sliding piece, and the rotating shaft which is rotatably connected, the front end part of the pull rod and the rotating shaft which is rotatably connected with the front wheel bracket are the same rotating shaft.

2. The foldable wheelchair as recited in claim 1, wherein: the foldable wheelchair further comprises a frame locking mechanism for locking the foldable wheelchair in an opening working state or a folding working state, and a frame unlocking operation piece for unlocking the frame locking mechanism, wherein when the frame locking mechanism is in an unlocking state, the side support can be switched between the opening working state and the folding working state.

3. The foldable wheelchair as recited in claim 2, wherein: the foldable wheelchair further comprises a sliding locking mechanism arranged between the sliding piece and the pedal rod and a sliding unlocking operation piece for unlocking the sliding locking mechanism, and when the sliding locking mechanism is in an unlocking state and the side bracket is changed between an opening working state and a folding working state, the sliding piece slides on the pedal rod along the front-back direction of the pedal rod; when the sliding locking mechanism is in a locking state, the positions of the sliding piece and the pedal rod are relatively fixed.

4. The foldable wheelchair as recited in claim 3, wherein: the frame unlocking operation piece and the sliding unlocking operation piece are the same unlocking operation piece, and the frame locking mechanism is unlocked while the sliding locking mechanism is unlocked.

5. The foldable wheelchair as recited in claim 4, wherein: the foldable wheelchair further comprises a handle, the handle is rotatably connected with the backrest bracket and the rear wheel bracket at the same time, and the handle is the unlocking operation piece.

6. The foldable wheelchair as recited in claim 3, wherein: the sliding locking mechanism comprises a locking assembly, the locking assembly comprises a locking groove formed on the pedal rod, a locking piece rotating shaft fixedly connected in the sliding piece, a locking piece rotatably connected on the locking piece rotating shaft, a lock tongue arranged on the locking piece and positioned on one side of the locking piece rotating shaft, and an elastic component arranged between the sliding piece and the lock tongue and used for driving the lock tongue to be inserted into the locking groove, and when the lock tongue is inserted into the locking groove, the sliding piece and the pedal rod are locked; when the sliding unlocking operation piece is operated, the locking piece rotates around the rotating shaft of the locking piece to enable the lock tongue to be separated from the lock groove, and the sliding piece and the pedal rod are unlocked.

7. The foldable wheelchair as recited in claim 6, wherein: the sliding locking mechanism further comprises an unlocking transmission assembly arranged between the locking assembly and the sliding unlocking operation member, the unlocking transmission assembly comprises a first transmission assembly matched with the sliding unlocking operation member and a second transmission assembly matched with the locking assembly, and the first transmission assembly and the second transmission assembly are connected through a traction cable.

8. The foldable wheelchair as recited in claim 7, wherein: the first transmission assembly comprises a first sliding block arranged in the pull rod in a sliding mode in the front-back direction, a pressing block connected to the first sliding block in a moving mode in the up-down direction, and a first reset piece arranged between the pull rod and the first sliding block and used for driving the first sliding block to reset, a chute is formed in the first sliding block, a first transmission pin is arranged on the pressing block and arranged in the chute in a sliding mode, one end of the traction cable is connected with the first sliding block, the sliding unlocking operation piece is matched with the pressing block, when the sliding unlocking operation piece is operated, the pressing block moves up and down to drive the first sliding block to slide, and the traction cable pulls the second transmission assembly.

9. The foldable wheelchair as recited in claim 7, wherein: the second transmission assembly comprises a second sliding block arranged in the sliding piece in a sliding manner along the front-back direction, a second transmission pin arranged on the second sliding block, and a second resetting piece arranged between the sliding piece and the second sliding block and used for driving the second sliding block to reset, and the other end of the traction cable is connected with the second sliding block; the locking piece be located locking piece pivot opposite side be provided with second driving pin cooperation portion, second driving pin cooperation portion orientation locking piece pivot one side be provided with along the back upper place and extend the cooperation inclined plane, the second driving pin support the cooperation inclined plane on, work as the haulage cable pulling the second slider slide, the second driving pin drive the locking piece wind the locking piece axis of rotation rotate.

10. The foldable wheelchair as recited in claim 1, wherein: the foldable wheelchair also comprises side armrests, the rear end parts of the side armrests are rotatably connected with the backrest support, and the rotatable connection position is positioned above the rotatable connection position of the seat rod and the backrest support.