CN107970095B

CN107970095B - Portable wheelchair

Info

Publication number: CN107970095B
Application number: CN201711353415.7A
Authority: CN
Inventors: 顾永辉; 吴昌琳; 程建军
Original assignee: Shanghai Citong Technology Co ltd
Current assignee: Shanghai Citong Technology Co ltd
Priority date: 2017-12-15
Filing date: 2017-12-15
Publication date: 2023-12-12
Anticipated expiration: 2037-12-15
Also published as: CN107970095A

Abstract

The invention discloses a portable wheelchair which is in an unfolded state and a folded state and comprises a frame module, a brake module, a seat module, a rear wheel module, a front wheel module, a pedal plate module and a pull rod module. The brake module set up in frame module's rear end, seat module set up in frame module's middle part is upwards, rear wheel module set up in frame module's lower extreme's rear portion, front wheel module set up in frame module's lower extreme's front portion, foot pedal module set up in frame module lower extreme's front portion, the pull rod module runs through frame module's front end and rear end, and the level sets up. The folding wheelchair meets various requirements of the elderly during traveling, is small in size after folding, can be placed in a trunk of an automobile, can reduce the influence of complex road conditions on the safety of the elderly, and can be folded and carried by a pull rod when the elderly does not sit on the wheelchair.

Description

Portable wheelchair

Technical Field

The invention relates to the field of wheelchairs, in particular to a portable wheelchair.

Background

Gradually enter the aged China, with the continuous improvement of the material culture living standard, the traveling frequency of the aged is gradually increased, and the demand for wheelchairs is also increased. The elderly travel purposes are various, and may be for travel, medical visits, and visiting friends.

In different travel scenes, the old needs to first take vehicles such as automobiles and subways to reach a parking lot or a station which is relatively close to the destination, and a distance still exists between the parking lot or the station and the destination. When taking the car, need fold the wheelchair, place in the trunk, if the volume after the wheelchair is folding is very big, just probably can't place the trunk of car, influences old person's trip. The existing folding wheelchair adopts a mode of folding towards the middle in a bilateral symmetry way, the volume after folding is still large, and the folding wheelchair cannot be placed in the trunk of a plurality of automobiles (especially cars).

At this distance through a parking lot or station to a destination, the elderly are likely to encounter undulations and irregularities in the road surface, which may present a risk to the elderly's travel, due to the many poorly designed places existing on the road, attraction, hospital or district. In the traveling process, particularly when the child is played with the child, the old does not want to sit on the wheelchair all the time, but needs to go up and down the wheelchair for many times. For example, on relatively flat roadways, elderly people want to walk up and down from a wheelchair; while in rough or sloped roadways, the elderly want to sit in a wheelchair and be pushed away. Therefore, when the wheelchair is not in use, it is important that the wheelchair be foldable and portable.

Therefore, those skilled in the art are devoted to developing a portable folding wheelchair, which meets various demands of the elderly during traveling, has small volume after folding, can be placed in a trunk of an automobile, can reduce the influence of complex road conditions on the safety of the elderly, and can fold the wheelchair and carry the wheelchair through a pull rod when the elderly does not sit on the wheelchair.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the present invention aims to further reduce the size of the wheelchair after folding, and the wheelchair can be carried by hand after folding, so as to facilitate traveling and reduce the influence of complex road conditions on the safety of the elderly.

In order to achieve the above object, the present invention provides a portable wheelchair having an unfolded state and a folded state, including a frame module, a brake module, a seat module, a rear wheel module, a front wheel module, a foot pedal module, and a drawbar module. When placing the wheelchair in the open state, frame module can fold back and forth, including left frame, right frame, back frame and end frame, left side frame with the right side frame is located the both sides of wheelchair respectively, end frame connect left side frame, right side frame and back frame, the brake module set up in the left and right sides of back frame, the seat module includes seat back, safety belt, handrail and seat cushion, the handrail is located the left and right sides top of seat cushion, through connecting rod and screw, with left side frame and right frame connection, the rear wheel module is located the back frame left and right sides, the front wheel module is located the front side of left side frame and right side frame, including running-board, connecting rod, couple, the setting of frame module in the rear end of frame module, the seat module set up in the middle part of frame module is upwards, the front wheel module set up in the front portion of frame module lower extreme, the running-board set up in the front end of frame module, the front end of the running-board is fixed in the front of frame module.

Further, the rear frame comprises a U-shaped frame, a return-shaped frame, a locking device, a U-shaped ring, a pushing handle, a handrail connecting device, a left frame connecting device, a right frame connecting device and two U-shaped connecting pieces, wherein the upper part and the middle part of the U-shaped frame are respectively provided with a connecting rod, the two sides of the U-shaped frame are connected, the U-shaped frame is fixedly connected with the U-shaped frame, the U-shaped ring is fixed in the middle of the middle connecting rod, and the pushing handle is respectively inserted into the left uppermost end and the right uppermost end of the U-shaped frame and can rotate inwards relative to the U-shaped frame. The handrail connecting device is located at the central position of two sides of the U-shaped frame, the handrail connecting device is connected with the handrail through a screw mechanism, the handrail and the U-shaped frame can rotate relatively, the left frame connecting device and the right frame connecting device are located at the right lower ends of the handrail connecting device respectively and are connected with the left frame and the right frame through the screw mechanism, the back-shaped frame is located under the U-shaped frame and is connected with the left frame and the right frame through a locking device, the locking device is in a locking state and an opening state, the U-shaped frame and the back-shaped frame can be fixedly connected in the locking state, the connection of the U-shaped frame and the back-shaped frame is still kept in the opening state, the U-shaped frame and the back-shaped frame can rotate relatively, a wide connecting rod is arranged at the upper middle position and the lower middle position of the back-shaped frame, two U-shaped connecting pieces are fixed at two sides of the wide connecting rod, and face the advancing direction of a wheelchair.

Further, the inside of the U-shaped frame is of a hollow structure.

Further, the locking device is located at the middle position of the upper end of the square frame.

Further, right frame includes T type frame, connecting rod and metal connecting piece, the one end and the rear wheel of T type frame, back frame link together, and back frame and T type frame can rotate relatively, T type frame is along the upward slope of wheelchair advancing direction and is extended, and other one end is located directly over the front wheel module with the connecting rod with metal connecting piece passes through pivot connection, other one end and the right frame connecting device of connecting rod pass through pivot connection, can keep the rotation each other between the two, the centre of connecting rod passes through pivot connection with the handrail, can keep the rotation each other between the two, the front wheel is connected to other one end of metal connecting piece, the connecting rod is located between two metal connecting pieces about to with two metal connecting piece fixed connection.

Further, the left frame and the right frame are symmetrical in structure.

Further, the brake module comprises a first brake control device, a control cable, a second brake control device, a brake assembly and a brake pad, wherein the first brake control device is fixed on a pushing handle on the upper portion of the rear frame, the control cable is connected with the first brake control device, penetrates through the rear frame and is connected with the brake assembly, and the second brake control device is located above the front side of the brake assembly and is fixedly connected with the brake assembly through a connecting rod.

Further, the brake assembly is positioned at the lower end of the side face of the rear frame.

Further, the front wheel module is totally two, is located the front side of left frame and right frame respectively, and every front wheel module includes coupling assembling, front wheel, preceding shockproof spring, front wheel module passes through coupling assembling and controls frame fixed connection, and preceding shockproof spring symmetry is located the both sides of front wheel, the rear wheel module is totally two, is located respectively the rear frame left and right sides, and every rear wheel module includes coupling assembling, rear wheel, back shockproof spring, through coupling assembling is in the same place with controlling frame and back frame fixed connection, back shockproof spring symmetry is located the both sides of rear wheel. Preferably, the front wheels and the rear wheels of the wheelchair are wide wheels, so that the wheelchair is more stable and reliable in running, and the wheels can be prevented from being blocked into narrow depressions on the ground.

Further, the pull rod module can be fixed below the seat cushion, so that the advantage of the arrangement is that more space can be vacated on the frame module below the seat cushion, thereby facilitating further upgrading or refitting of the wheelchair.

The folding mode of the wheelchair is different from the left-right folding mode in the prior art. Wheelchairs of the prior art fold by folding the seat cushion and the seat back, which typically require a flexible or relatively thin material (e.g., canvas), with low safety and comfort. The wheelchair disclosed by the invention is folded back and forth in a mode of folding the frame module, so that the folded wheelchair is smaller in size (the left and right width is slightly larger than the width of a seat cushion or a seat backrest) and can be easily placed into a trunk of a car; on the other hand, the seat cushion or the seat back does not need to be folded, so that the seat cushion or the seat back can be made of thicker materials, and the seat cushion or the seat back is safer and more comfortable.

The two pushing handles of the wheelchair can rotate inwards relative to the U-shaped frame, namely, the state of being basically vertical to the left and right upper ends of the U-shaped frame is changed into the state of being basically parallel to the upper connecting rod of the U-shaped frame. The rotation is convenient for folding and storage on one hand, and on the other hand, the pushing handle has two states, so that the safety of the wheelchair is improved. When the push handle is basically vertical to the left upper end and the right upper end of the U-shaped frame, the force application point when the wheelchair is pushed is positioned behind the U-shaped frame, a certain force arm exists relative to the U-shaped frame, and if a relatively large downward force is applied to the push handle, the wheelchair is tilted, so that the wheelchair is not safe. However, the wheelchair of the present invention provides another state in which the push handle is substantially parallel to the upper connecting rod of the U-shaped frame, in which case the point of application of force when pushing the wheelchair is located above the U-shaped frame, and there is substantially no moment arm with respect to the U-shaped frame, and even if a large downward force is applied, the wheelchair is not easily tilted, which greatly increases the safety and stability of the wheelchair.

The first brake control device of the wheelchair of the present invention is used for braking by a cart occupant during wheelchair travel, and the second brake control device is used for braking by a seated occupant during wheelchair travel. In the prior art, the first brake control device and the second brake control device are usually independent, but the first brake control device and the second brake control device both control the same brake assembly, so the structure is simpler.

The folding wheelchair can meet various requirements of the elderly in traveling, is small in size after folding, can be easily placed in the trunk of an automobile, can be folded and towed by the pull rod when the elderly does not sit on the wheelchair, and is convenient to carry when traveling.

The conception, specific structure, and technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, features, and effects of the present invention.

Drawings

FIG. 1 is a schematic view of the overall structure of a preferred embodiment of the present invention;

FIG. 2 is a schematic view of the overall structure (rear view) of a preferred embodiment of the present invention;

FIG. 3 is a schematic view of a rear frame of a preferred embodiment of the present invention;

FIG. 4 is a schematic view of the overall structure of a preferred embodiment of the present invention (right side view);

FIG. 5 is a schematic overall structure of another preferred embodiment of the present invention;

FIGS. 6 and 7 are schematic views showing a folded state of another preferred embodiment of the present invention;

FIG. 8 is a schematic view of a folded state (pull rod pulled out) of another preferred embodiment of the present invention;

fig. 9 is a schematic view showing another pushing handle state according to another preferred embodiment of the present invention.

Wherein, the frame module 1, the brake module 2, the seat module 3, the rear wheel module 4, the front wheel module 5, the foot pedal module 6, the tie rod module 7, the left frame 11, the right frame 12, the rear frame 13, the bottom frame 14, the first brake control device 21, the control cable 22, the second brake control device 23, the brake module 24, the brake pad 25, the seat back 31, the seat belt 32, the armrest 33, the seat cushion 34, the connection assembly 41, the rear wheel 42, the rear shock springs 43 and 44, the connection assembly 51, the front wheel 52, the front shock springs 53 and 54, the foot pedal 61, the connection rods 62 and 63, the small hooks 64 and 65, the T-shaped frame 121, the connection rod 122, the metal connection member 123, the U-shaped frame 1301, the loop back 1302, the locking device 1303, the U-shaped loop 1304, the push handles 1305 and 1306, the armrest connection devices 1307 and 1308, the left frame connection device 1309, the right frame connection device 1310, the U-shaped connection members 1311 and 1312, the rotary switch 1313, the double-layer connection rod 141, the connection rod 142, the U-shaped loop 143.

Detailed Description

The following description of the preferred embodiments of the present invention refers to the accompanying drawings, which make the technical contents thereof more clear and easy to understand. The present invention may be embodied in many different forms of embodiments and the scope of the present invention is not limited to only the embodiments described herein.

In the drawings, like structural elements are referred to by like reference numerals and components having similar structure or function are referred to by like reference numerals. The dimensions and thickness of each component shown in the drawings are arbitrarily shown, and the present invention is not limited to the dimensions and thickness of each component. The thickness of the components is exaggerated in some places in the drawings for clarity of illustration.

Example 1

As shown in fig. 1, the portable wheelchair according to the present invention has an unfolded state and a folded state, and is placed in the unfolded state, and includes a frame module 1, a brake module 2, a seat module 3, a rear wheel module 4, a front wheel module 5, a foot pedal module 6, and a drawbar module 7. The rear wheel module 4 sets up in the rear portion of frame module 1 lower extreme, and front wheel module 5 sets up in the front portion of frame module 1 lower extreme, and brake module 2 sets up in the rear end of frame module 1 to divide into upper and lower two parts, seat module 3 sets up in the middle part of frame module 1 upwards, and running-board module 6 sets up in the front portion of frame module 1 lower extreme, and pull rod module 7 runs through the front end and the rear end of frame module 1, and the level sets up, and sets up on the horizontal pole of frame module bottom.

The frame module 1 comprises a left frame 11, a right frame 12, a rear frame 13 and a bottom frame 14, wherein the left frame 11 and the right frame 12 are respectively positioned on two sides of the wheelchair, the left frame 11 and the right frame 12 are symmetrical in structure, and the bottom frame 14 is connected with the left frame 11, the right frame 12 and the rear frame 13. The brake modules 2 are arranged on the left side and the right side of the rear frame 13 respectively, and the same two sets are shared. The set of brake module comprises a first brake control device 21, a control cable 22, a second brake control device 23, a brake assembly 24 and a brake pad 25, wherein the first brake control device 21 is fixed on a wheelchair pushing handle on the upper portion of the rear frame 13, the control cable 22 is connected with the first brake control device 21, penetrates through the rear frame 13 and is connected with the brake assembly 24, the brake assembly 24 is positioned at the lower end of the side face of the rear frame 13, and the second brake control device 23 is positioned above the front side of the brake assembly 24 and is fixedly connected with the brake assembly 24 through a connecting rod. The seat module 3 comprises a seat back 31, a safety belt 32, armrests 33 and a seat cushion 34, wherein the armrests 33 are two same sets, are respectively positioned above the left side and the right side of the seat cushion 34, are connected with the left frame 11 and the right frame 12 through connecting rods and screws, and can be made of hard materials. The front wheel modules 5 are respectively positioned at the front sides of the left frame 11 and the right frame 12, each front wheel module comprises a connecting component 51, a front wheel 52 and front shockproof springs 53 and 54, the front wheel modules 5 are fixedly connected with the left frame and the right frame through the connecting component 51, and the front shockproof springs 53 and 54 are symmetrically positioned at two sides of the front wheel 52. The foot pedal module 6 comprises a foot pedal 61, connecting rods 62 and 63 and small hooks 64 and 65, wherein the connecting rods 62 and 63 are connected with the foot pedal and the frame, and the small hooks 63 and 64 are respectively arranged on the connecting rods 62 and 63.

The chassis frame 14 comprises a double-layer connecting rod 141, a connecting rod 142 and a U-shaped ring 143. One end of the double-layer connecting rod 141 is hinged with the rear frame 13, the double-layer connecting rod 141 can rotate relative to the rear frame 13, the other end of the double-layer connecting rod 141 is fixedly connected with the connecting rod 142, and the connecting rod 142 and the left and right frames 11 and 12 are respectively and fixedly connected above the left and right front wheel modules. A U-shaped ring 143 is provided in the middle of the connection rod 142 toward the wheelchair advancing direction, and the U-shaped ring 143 can rotate around the connection rod 142.

The U-shaped ring 143 is turned in a vertically downward direction to be hooked with the small hooks 63 and 64 of the pedal module 6, and the pedal module 6 can be fixed so that the pedal module 6 is stationary. When the U-shaped ring 143 is rotated horizontally along the connecting rod 142, away from the small hooks 63 and 64, the foot pedal module 6 will be able to rotate about the connecting rod 142.

As shown in fig. 2, there are two rear wheel modules 4, which are respectively located at left and right sides of the rear frame, each rear wheel module includes a connecting component 41, a rear wheel 42, and rear shock springs 43 and 44, the rear wheel modules 4 are fixedly connected with the left and right frames and the rear frame through the connecting component 41, and the rear shock springs 43 and 44 are symmetrically located at two sides of the rear wheel 42.

As shown in fig. 3, the rear frame 13 includes a U-shaped frame 1301, a return frame 1302, a locking device 1303, a U-shaped ring 1304, push handles 1305 and 1306, armrest connection devices 1307 and 1308, a left frame connection device 1309, a right frame connection device 1310, and U-shaped connectors 1311 and 1312. The inside of U type frame 1301 is hollow structure, and upper portion and middle part have a connecting rod respectively, connect the both sides of U type frame to with U type frame fixed connection, be fixed with U type ring 1304 in the middle part of middle part connecting rod. Push handles 1305 and 1306 are respectively inserted into the left and right uppermost ends of the U-shaped frame 1301, handrail connecting devices 1307 and 1308 are positioned at the central positions of two sides of the U-shaped frame 1301, are connected with the handrails through screw mechanisms, the handrails and the U-shaped frame can relatively rotate, and left frame connecting devices 1309 and right frame connecting devices 1310 are respectively positioned at the right lower ends of the handrail connecting devices 1307 and 1308 and are connected with left and right frames through screw mechanisms. The return type frame 1302 is located under the U type frame 1301, the two are connected through a locking device 1303, the locking device 1303 is located in the middle of the upper end of the return type frame 1302, the locking device 1303 is provided with a locking state and an opening state, the U type frame 1301 and the return type frame 1302 can be fixedly connected in the locking state, the connection of the U type frame 1301 and the return type frame 1302 is still kept in the opening state, and the U type frame 1301 and the return type frame 1302 can rotate relatively. A wide connecting rod is arranged at the upper and lower middle parts of the return frame 1302, and U-shaped connecting pieces 1311 and 1312 are fixed at two sides of the wide connecting rod and face the advancing direction of the wheelchair.

As shown in fig. 4, the right frame 12 includes a T-frame 121, a connecting rod 122, and a metal connector 123. One end of the T-shaped frame 121 is connected with the rear wheel 42 and the rear frame 13, and the rear frame 13 and the T-shaped frame 121 can rotate relatively. The T-shaped frame 121 extends obliquely upward in the wheelchair forward direction, and has one end located directly above the front wheel and pivotally connected to the connecting rod 122 and the metal link 123. The other end of the connecting rod 122 is pivotally connected to the right frame attachment 1310, which is maintained in rotation with one another. The middle of the connecting rod 122 is pivotally connected to the arm rest 33 so as to be rotatable relative to each other. The other end of the metal link 123 is connected to the front wheel 52. The connecting rod 142 is located between the left and right metal connecting pieces 123 and fixedly connected with the two metal connecting pieces 123.

A rotary switch 1313 is embedded in the portion of push handle 1306 that is inserted into U-shaped frame 1301. The switch 1313 is turned off, the pushing handle 1306 is locked against rotation relative to the U-shaped frame 1301, and the switch 1313 is turned on, and the pushing handle 1306 is unlocked and allowed to rotate inward relative to the U-shaped frame 1301 (as shown in fig. 9). When the wheelchair is pushed in the state shown in fig. 9, the point of application is above the U-shaped frame 1301, there is substantially no moment arm with respect to the U-shaped frame 1301, and even if a large downward force is applied, the wheelchair is not easily tilted, which greatly increases the safety and stability of the wheelchair.

When the wheelchair is folded, the locking device 1303 is placed in an open state, the U-shaped frame 1301 and the back-shaped frame 1302 can rotate relatively, so that the U-shaped frame 1301 of the back frame folds towards the direction close to the T-shaped frame 121, and the seat armrest 33 is driven to rotate to be close to the T-shaped frame 121 together. The U-shaped ring 143 is separated from the small hooks 63 and 64 on the pedals, the two front wheels are folded towards the T-shaped frame 121, the pedal module 6 is rotated to be close to the chassis 14, the whole wheelchair is moved towards the T-shaped frame 121 back and forth, the switch 1313 is opened, the pushing handle 1306 is rotated to turn towards the inner side of the U-shaped frame 1301, the switch 1313 is closed, and the folding of the wheelchair is completed. When the wheelchair is in a folded state, the pull rod in the pull rod module 7 is pulled out, pulling the folded wheelchair like pulling a trunk.

When the wheelchair is opened, the pull rod is retracted into the pull rod module 7, the U-shaped frame 1301 of the rear frame is pulled away from the T-shaped frame 121 to drive the seat armrest 33 to rotate, and when the U-shaped frame 1301 and the return frame 1302 return to the same horizontal plane, the locking device 1303 is placed in a locking state. The front wheel is turned to return the front wheel to the vertical position, securing the U-ring 143 with the small hooks 63 and 64 on the foot pedals. The switch 1313 is turned on, the push handle 1306 is turned to turn to the outside of the U-shaped frame 1301, and the switch 1313 is turned off, so that the entire wheelchair returns to the on state.

Example 2

As shown in fig. 5, the pull rod module 7 of the portable wheelchair according to the present invention may be fixed under the seat cushion 34. Although the position of the drawbar module 7 in the open state is significantly different from embodiment 1; however, in the folded state (as shown in fig. 6 and 7), the position of the pull rod module 7 is similar to that of the embodiment 1, and the pull rod module has similar effect, namely, the pull rod can be pulled out to drag the wheelchair to move forward (as shown in fig. 8), similar to dragging the luggage case, and the wheelchair is very convenient to carry during traveling. The advantage of this arrangement of the drawbar module 7 is that it allows more space to be freed up on the frame module 1 below the seat cushion 34 to facilitate further upgrades or retrofitting of the wheelchair.

The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention without requiring creative effort by one of ordinary skill in the art. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.

Claims

1. A portable wheelchair having an unfolded state and a folded state, wherein the wheelchair comprises a frame module, a brake module, a seat module, a rear wheel module, a front wheel module, a foot pedal module and a pull rod module;

the frame module can be folded back and forth and comprises a left frame, a right frame, a rear frame and a bottom frame, wherein the left frame and the right frame are respectively positioned at two sides of the wheelchair, and the bottom frame is connected with the left frame, the right frame and the rear frame;

the brake modules are arranged on the left side and the right side of the rear frame;

the seat module comprises a seat backrest, a safety belt, armrests and a seat cushion, wherein the armrests are positioned above the left side and the right side of the seat cushion and are connected with the left frame and the right frame through a first connecting rod and screws;

the rear wheel modules are positioned at the left side and the right side of the rear frame and are arranged at the rear part of the lower end of the frame module;

the front wheel module is positioned at the front sides of the left frame and the right frame and is arranged at the front part of the lower end of the frame module;

the pedal module comprises a pedal, a second connecting rod and a small hook and is arranged at the front part of the lower end of the frame module;

the brake module is arranged at the rear end of the frame module;

the seat module is arranged above the middle part of the frame module;

the pull rod module penetrates through the front end and the rear end of the frame module, is horizontally arranged and is fixed above the bottom frame or below the seat cushion;

the rear frame comprises a U-shaped frame, a back-shaped frame, a locking device, a U-shaped ring, a pushing handle, a handrail connecting device, a left frame connecting device, a right frame connecting device and two U-shaped connecting pieces, wherein the upper part and the middle part of the U-shaped frame are respectively provided with a third connecting rod which is connected with the two sides of the U-shaped frame and fixedly connected with the U-shaped frame, the U-shaped ring is fixed in the middle of the third connecting rod in the middle, the pushing handle is respectively inserted into the left and right uppermost ends of the U-shaped frame, the handrail connecting device is positioned at the central positions of the two sides of the U-shaped frame and is connected with the handrail through a screw mechanism, the handrail and the U-shaped frame can relatively rotate, the left frame connecting device and the right frame connecting device are respectively positioned at the right lower end of the handrail connecting device and are connected with the left frame and the right frame through the screw mechanism, the back-shaped frame is positioned under the U-shaped frame and is connected with the locking device, and the locking device is provided with a locking device and an unlocking state, and the U-shaped frame can be fixedly connected under the back-shaped frame and the locking state; in the open state, the connection between the U-shaped frame and the return-type frame is still maintained, but the U-shaped frame and the return-type frame can rotate relatively, a wide connecting rod is arranged in the middle of the upper part and the lower part of the return-type frame, two U-shaped connecting pieces are fixed on two sides of the wide connecting rod, and the two U-shaped connecting pieces face the advancing direction of the wheelchair;

the U-shaped frame is hollow;

the pushing handle can rotate inwards relative to the U-shaped frame;

the locking device is positioned at the middle position of the upper end of the square frame;

the right frame comprises a T-shaped frame, a fourth connecting rod and a metal connecting piece, one end of the T-shaped frame is connected with the rear wheel and the rear frame, the rear frame and the T-shaped frame can rotate relatively, the T-shaped frame extends obliquely upwards along the advancing direction of the wheelchair, the other end of the T-shaped frame is positioned right above the front wheel module and is connected with one end of the fourth connecting rod and one end of the metal connecting piece through a pivot, the other end of the fourth connecting rod is connected with the right frame connecting device through a pivot, the other end of the fourth connecting rod and the right frame connecting device can keep mutual rotation, the middle of the fourth connecting rod and the handrail are connected through a pivot, the other end of the metal connecting piece is connected with the front wheel, and the fifth connecting rod is positioned between the left metal connecting piece and the right metal connecting piece and is fixedly connected with the two metal connecting pieces;

the left frame and the right frame are symmetrical in structure;

the brake module comprises a first brake control device, a control cable, a second brake control device, a brake assembly and a brake pad, wherein the first brake control device is fixed on the pushing handle at the upper part of the rear frame, the control cable is connected with the first brake control device, penetrates through the rear frame and is connected with the brake assembly, and the second brake control device is positioned above the front side of the brake assembly and is fixedly connected with the brake assembly through a sixth connecting rod;

the brake component is positioned at the lower end of the side surface of the rear frame;

the front wheel modules are two in total and are respectively positioned on the front sides of the left frame and the right frame, each front wheel module comprises a connecting component, a front wheel and a front shockproof spring, the front wheel modules are fixedly connected with the left frame and the right frame through the connecting components, the front shockproof springs are symmetrically positioned on two sides of the front wheel, the rear wheel modules are two in total and are respectively positioned on the left side and the right side of the rear frame, each rear wheel module comprises a connecting component, a rear wheel and a rear shockproof spring, the left frame, the right frame and the rear frame are fixedly connected together through the connecting component, and the rear shockproof springs are symmetrically positioned on two sides of the rear wheel.