CN113952129A

CN113952129A - Wheelchair with adjustable pedal

Info

Publication number: CN113952129A
Application number: CN202110169416.6A
Authority: CN
Inventors: 顾永辉; 程建军; 吴昌琳
Original assignee: Shanghai Citong Technology Co ltd
Current assignee: Yongkang Haobang Medical Equipment Co.,Ltd.
Priority date: 2021-02-07
Filing date: 2021-02-07
Publication date: 2022-01-21
Anticipated expiration: 2041-02-07
Also published as: CN113952129B

Abstract

The present invention provides a wheelchair with adjustable footrests, which relates to the technical field of mobility tools, and includes a frame, a seat, a wheel and a footrest structure, wherein the seat is mounted on the frame, and the wheel is mounted on the At the bottom of the frame, the foot pedal structure is rotatably arranged at the front of the frame, and the frame is provided with a drive assembly for driving the foot pedal structure to rotate; in a normal state, the foot pedal structure is horizontal Suspended at the bottom of the frame. In this way, the position of the foot pedal can be switched between the bottom of the frame and the front of the frame, and the foot pedal can be rotated and opened and closed in the horizontal direction, which is helpful to solve the obstacle of the foot pedal when the user gets on and off the wheelchair, and has a It helps to reduce the insecurity caused by the user bending over and flipping the pedal, thereby helping to improve the convenience for the user to adjust the position of the pedal.

Description

Wheelchair with adjustable pedal

Technical Field

The utility model relates to the technical field of travel tools, in particular to a wheelchair with an adjustable pedal.

Background

Wheelchairs are chairs equipped with wheels to help replace walking and are classified into electric and manual folding wheelchairs. The wheelchair not only meets the requirements of physical disabilities and mobility-handicapped people 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.

At present, pedals in wheelchairs are basically fixed, and the following problems exist in the pedals: 1. for people with different heights, the fixed pedal is not comfortable to ride; 2. because the fixed pedal extends out of the wheelchair, the wheelchair is folded, the occupied space is still large and inconvenient to store, and the wheelchair is difficult to get on and off due to the obstruction of the pedal.

The prior Chinese patent with the publication number of CN210582887U discloses a foldable pedal mechanism of a wheelchair, which comprises the wheelchair, wherein the wheelchair is provided with a wheelchair framework and a pedal, and is characterized in that a pedal supporting cross rod is arranged on the front side of the lower part of the wheelchair framework, a pair of pedal supporting vertical rods is arranged on the pedal supporting cross rod in a sliding manner, the front ends of the pair of pedal supporting vertical rods are hinged with a pedal, and the pedal can turn around the hinged point of the front ends of the pedal supporting vertical rods and the pedal supporting vertical rods. The pedal plate can be adjusted in a telescopic manner from front to back.

The inventor believes that the prior art pedal requires the user to bend down and lean forward to manually turn over, most of the wheelchair users have inconvenience in legs and feet, and the pedal is installed at a low position, so that the operation of the user is difficult, and there is a need for improvement.

Disclosure of Invention

In view of the deficiencies in the prior art, it is an object of the present invention to provide a wheelchair with adjustable footrest.

The wheelchair with the adjustable pedal comprises a frame, a seat, wheels and a pedal structure, wherein the seat is installed on the frame, the wheels are installed at the bottom of the frame, the pedal structure is rotatably arranged at the front part of the frame, and a driving assembly for driving the pedal structure to rotate is arranged on the frame; under the conventional state, the pedal structure is horizontally hung at the bottom of the frame.

Preferably, a mounting seat is fixed at the front end of the frame, a fixed seat is fixedly mounted on one side, far away from the frame, of the mounting seat, the pedal plate structure comprises a pedal plate and a connecting assembly, the connecting assembly comprises a connecting swing rod and a rotating shaft, any one end of the connecting swing rod is fixedly connected with the pedal plate, the other end of the connecting swing rod is fixedly connected with the rotating shaft, the rotating shaft is vertically mounted between the mounting seat and the fixed seat and is respectively in running fit with the mounting seat and the fixed seat, and the upper end of the rotating shaft is further connected with a driving assembly.

Preferably, the lower side of the mounting seat is provided with a groove, the groove is semicircular in shape, the rotating shaft is provided with a convex rib, and the convex rib is embedded in the groove and is in sliding fit with the groove.

Preferably, when the pedal plate is positioned in front of the frame, a bending part is arranged on one side of the pedal plate, which is far away from the central axis of the frame.

Preferably, the driving assembly comprises a first transmission shaft rod and a first control handle, the upper end of the first transmission shaft rod is fixedly connected with the first control handle, the first transmission shaft rod is vertically installed between the installation seat and the fixed seat, the first transmission shaft rod is respectively in running fit with the installation seat and the fixed seat, and the lower end of the first transmission shaft rod is coaxially and fixedly connected with the upper end of the rotating shaft.

Preferably, the driving assembly comprises a second transmission shaft rod, a second control handle and a first cylindrical cam, the first cylindrical cam is vertically installed between the installation seat and the fixed seat and is in sliding fit with the installation seat and the fixed seat respectively, the sliding direction of the first cylindrical cam is the same as the axial direction of the first cylindrical cam, a first curve groove wound around the central axis of the first cylindrical cam is formed in the peripheral side wall of the first cylindrical cam, and the second control handle is fixedly connected to the top of the first cylindrical cam; the second transmission shaft lever is arranged between the mounting seat and the fixing seat and is respectively in running fit with the mounting seat and the fixing seat, the second transmission shaft lever coaxially penetrates into the first cylindrical cam from bottom to top and is in running sliding fit with the first cylindrical cam, a moving roller is arranged on the side wall of the second transmission shaft lever, the moving roller is embedded in the first curve groove and is in rolling fit with the first curve groove, and the lower end of the second transmission shaft lever is coaxially and fixedly connected with the upper end of the rotating shaft.

Preferably, a linear guide groove is formed in the mounting seat, the length direction of the linear guide groove is the same as that of the first cylindrical cam, a linear convex rib is fixedly arranged on the outer side wall of the first cylindrical cam, the linear convex rib is embedded in the linear guide groove, and the linear convex rib is matched with the linear guide groove in a sliding manner.

Preferably, the driving assembly comprises a speed reduction motor and a third transmission shaft rod, the third transmission shaft rod is vertically installed between the installation seat and the fixed seat and is in running fit with the installation seat and the fixed seat respectively, the speed reduction motor is fixedly installed on the upper side of the installation seat, an output shaft of the speed reduction motor is fixedly connected with the top end of the third transmission shaft rod, and the lower end of the third transmission shaft rod is coaxially and fixedly connected with the upper end of the rotating shaft.

Preferably, the driving assembly drives the pedal structure to rotate and simultaneously drives the pedal structure to do lifting motion, the driving assembly comprises a fourth transmission shaft rod, a third control handle and a second cylindrical cam, the second cylindrical cam is vertically and fixedly installed between the installation seat and the fixed seat, and a second curve groove wound on the central axis of the second cylindrical cam is formed in the peripheral side wall of the second cylindrical cam; the fourth transmission shaft lever coaxially penetrates through the second cylindrical cam and is in sliding fit with the second cylindrical cam in a rotating mode, a matching roller is arranged on the outer side wall of the fourth transmission shaft lever, the matching roller is embedded in the second curve groove and is in rolling fit with the second curve groove, the third control handle is fixedly connected with the top end of the fourth transmission shaft lever, and the lower end of the fourth transmission shaft lever is coaxially and fixedly connected with the upper end of the rotating shaft.

Preferably, the driving assembly drives the pedal structure to move up and down while driving the pedal structure to rotate, the driving assembly includes a threaded sleeve, a fifth transmission shaft rod and a fourth control handle, the threaded sleeve is vertically and fixedly mounted between the mounting seat and the fixing seat, the fifth transmission shaft rod coaxially penetrates through the threaded sleeve and is in threaded fit with the threaded sleeve, the fourth control handle is fixedly connected with the top end of the fifth transmission shaft rod, and the lower end of the fifth transmission shaft rod is fixedly connected with the rotating shaft.

Compared with the prior art, the utility model has the following beneficial effects:

1. the driving assembly drives the pedal plate structure to rotate, so that the position of the pedal plate is switched between the bottom of the frame and the front of the frame, the pedal plate can rotate to open and close along the horizontal direction, the problem of the blockage of the pedal plate when a user gets on and off the wheelchair is solved, the unsafety caused by turning over the pedal plate by bending the waist of the user is reduced, and the convenience for the user to adjust the position of the pedal plate is improved;

2. the utility model can make the pedal rotate to open and close along the horizontal direction through the rotating structure. When the foot pedal is opened forwards, an interference space formed by the front wheels can be bypassed, so that the foot pedal with larger left and right width can be selected, and the comfort of putting feet of a user is improved;

3. the utility model can make the pedal rotate and open along the horizontal direction and move up and down through the rotating structure. When the pedal is opened forwards, the interference space formed by the front wheels can be bypassed, the feet can be placed at the low position of the pedal, and the positions of the feet are gradually lifted along with the upward movement of the pedal, so that the problem that the feet are inconvenient to place due to the fact that the pedal is too high is solved, and the convenience of a user in taking is improved.

Drawings

Other features, objects and advantages of the utility model will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

FIG. 1 is a schematic view of the overall structure of the present invention, showing the foot board located at the front of the frame;

FIG. 2 is a schematic view of the overall structure of the present invention, wherein the foot rest is located at the bottom of the frame;

FIG. 3 is a schematic view of the overall structure of the pedal connecting assembly according to the present invention;

FIG. 4 is a schematic view of the overall structure of a driving assembly according to the present invention;

FIG. 5 is a schematic view showing the overall structure of a driving unit according to variation 1 of the present invention;

fig. 6 is an exploded view of a coupling structure of a driving unit and a coupling unit according to a variation 1 of the present invention;

FIG. 7 is a schematic view showing the overall structure of a driving unit according to variation 2 of the present invention;

FIG. 8 is a schematic view showing the overall structure of a driving unit according to variation 3 of the present invention;

fig. 9 is a schematic view of the overall structure of a driving assembly according to variation 4 of the present invention.

Reference numerals: 1. a frame; 11. a seat; 12. a wheel; 13. a mounting seat; 131. a groove; 132. a linear guide groove; 14. a fixed seat; 15. a pedal structure; 2. a foot pedal; 21. a bending section; 3. a connecting assembly; 31. connecting the swing rod; 32. a rotating shaft; 321. a rib is protruded; 4. a drive assembly; 41. a first drive shaft; 42. a first manipulating handle; 43. a first positioning sheet; 51. a second drive shaft; 511. a moving roller; 52. a second manipulating handle; 53. a first cylindrical cam; 531. a first curved groove; 532. linear convex ribs; 54. a second positioning sheet; 61. a reduction motor; 62. a third drive shaft; 63. a third positioning sheet; 71. a fourth drive shaft; 711. a mating roller; 72. a third manipulating handle; 73. a second cylindrical cam; 731. a second curved groove; 81. a threaded sleeve; 82. a fifth drive shaft; 821. a threaded portion; 83. and a fourth operating handle.

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the utility model, but are not intended to limit the utility model in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the utility model. All falling within the scope of the present invention.

As shown in fig. 1 and 2, the wheelchair with adjustable pedals provided by the utility model comprises a frame 1, a seat 11, wheels 12 and a pedal structure 15, wherein the seat 11 is horizontally and fixedly arranged on the frame 1, the two wheels 12 are respectively and symmetrically arranged at the front part and the rear part of the bottom of the frame 1, and the two wheels 12 arranged at the front part of the frame 1 are universal wheels.

The pedal structure 15 is installed at the front part of the frame 1, the pedal structure 15 comprises a pedal 2 and a connecting component 3, and the frame 1 is also provided with a driving component 4 for driving the pedal structure 15 to rotate. Under the conventional state, the pedal 2 is horizontally hung at the bottom of the frame 1; when the bicycle is used, a worker controls the connecting assembly 3 through the driving assembly 4 to drive the pedal plate 2 to rotate until the pedal plate 2 rotates to a proper position in the front of the bicycle frame 1, and the pedal plate 2 is located between the two universal wheels.

As shown in fig. 3, the footrest structures 15 are mounted one on each of the left and right sides of the front portion of the frame 1. When the bicycle is in an open state, the two pedals 2 are obliquely and upwards arranged from one side of the two pedals close to the bicycle frame 1 to the side of the two pedals far away from the bicycle frame 1, and the edges of one side of the two pedals 2 far away from the central axis of the bicycle frame 1 are integrally formed with the bending part 21, so that the comfort and the safety of a user are improved.

Since the two pedal structures 15 are identical in composition and mounting structure to the frame 1, a set of pedal structures 15 will be described as an example.

As shown in fig. 3, a mounting seat 13 is vertically welded and fixed at the front end of the frame 1, the mounting seat 13 is located behind the universal wheel, and a fixing seat 14 is fixedly connected to one side of the mounting seat 13 departing from the frame 1 through a bolt. The connecting assembly 3 comprises a connecting swing rod 31 and a rotating shaft 32, the rotating shaft 32 is vertically installed at the lower sides of the installation seat 13 and the fixed seat 14 and is in running fit with the installation seat 13 and the fixed seat 14 respectively, any end of the connecting swing rod 31 is fixedly connected with one side of the pedal 2 close to the frame 1 in a welding mode, and the other end of the connecting swing rod 31 penetrates into one side of the rotating shaft 32 and is fixedly connected with the same. The connecting swing link 31 is curved and has a certain radian. When the pedal 2 is opened forward, the problem that the left and right width of the pedal 2 is too small due to the interference space formed by the universal wheels as the front wheels can be avoided, and the comfort of putting the foot of the user is improved.

Further, a groove 131 is formed in the bottom wall of the mounting seat 13, the groove 131 is semicircular, and the central axis of the semicircular groove 131 is collinear with the central axis of the rotating shaft 32. The side wall of the rotating shaft 32 is integrally formed with a rib 321, and the rib 321 penetrates into the groove 131 from bottom to top and is matched with the groove 131 in a sliding manner. Due to the guiding effect of the groove 131, on one hand, the stability of rotation of the rotating shaft 32 is improved, on the other hand, the rotation range of the rotating shaft 32 is limited, further, the movement range of the pedal plate 2 is limited, and the limit between the pedal plate 2 and the wheel 12 is reduced.

As shown in fig. 4, the driving assembly 4 includes a first transmission shaft rod 41 and a first control handle 42, the first transmission shaft rod 41 is vertically installed between the installation seat 13 and the fixed seat 14 and is respectively in rotating fit with the installation seat 13 and the fixed seat 14, and the first transmission shaft rod 41 is clamped by the installation seat 13 and the fixed seat 14 in a matching manner, so that the installation of the first transmission shaft rod 41 on the frame 1 is realized. Coaxial integrated into one piece has first locating piece 43 on first transmission shaft pole 41, and first locating piece 43 has two along the length direction interval shaping of first transmission shaft pole 41 on first transmission shaft pole 41, and two first locating pieces 43 all inlay and establish in mount pad 13 and fixing base 14, and arbitrary first locating piece 43 equally divide respectively with mount pad 13 and fixing base 14 normal running fit.

The first operating handle 42 is welded and fixed to the top end of the first transmission shaft rod 41, and the lower end of the first transmission shaft rod 41 is coaxially and fixedly connected with the upper end of the rotating shaft 32. The user rotates the first manipulation handle 42 to rotate the rotation shaft 32, thereby rotating the footrests 2 and bringing the footrests 2 into the bottom of the frame 1, or rotating the footrests 2 from the bottom of the frame 1 to a proper position in front of the frame 1.

Modification example 1

As shown in fig. 5, the driving assembly 4 includes a second transmission shaft 51, a second control handle 52 and a first cylindrical cam 53, the first cylindrical cam 53 is vertically installed between the mounting seat 13 and the fixing seat 14 and is slidably engaged with the mounting seat 13 and the fixing seat 14, and a sliding direction of the first cylindrical cam 53 is the same as an axial direction of the first cylindrical cam 53. A first curved groove 531 is formed on the side wall of the first cylindrical cam 53, and the first curved groove 531 surrounds the central axis of the first cylindrical cam 53.

The second transmission shaft lever 51 is rotatably installed between the mounting seat 13 and the fixing seat 14, and the second transmission shaft lever 51 coaxially penetrates into the first cylindrical cam 53 from bottom to top and is in sliding fit with the first cylindrical cam. The outer side wall of the second transmission shaft 51 is embedded with a moving roller 511, and the moving roller 511 is embedded in the first curved groove 531 and is in rolling fit with the first curved groove. Still coaxial integrated into one piece has second spacer 54 on the second transmission axostylus axostyle 51, and second spacer 54 is located the outside of first cylindrical cam 53 lower part, and second spacer 54 level inlays and establishes between mount pad 13 and fixing base 14 and respectively with the two normal running fit, has improved the reliability that second transmission axostylus axostyle 51 installed on mount pad 13 and fixing base 14 with the help of second spacer 54, and has improved second transmission axostylus axostyle 51 pivoted stability.

The second control handle 52 is welded and fixed on the top end of the first cylindrical cam 53, the lower end of the second transmission shaft rod 51 is coaxially welded and fixedly connected with the upper end of the rotating shaft 32, a worker lifts or lowers the first cylindrical cam 53 through the second control handle 52, and drives the second transmission shaft rod 51 to rotate and drives the rotating shaft 32 to rotate by means of the matching of the moving roller 511 and the first curve groove 531, so that the pedal plate 2 is collected into the bottom of the frame 1, or the pedal plate 2 is rotated to a proper position in front of the frame 1 from the bottom of the frame 1.

As shown in fig. 5 and 6, the mounting base 13 is provided with a linear guide groove 132, the length direction of the linear guide groove 132 is in the same direction as the axial direction of the first cylindrical cam 53, a linear rib 532 is integrally formed on the outer side wall of the first cylindrical cam 53, the linear rib 532 is embedded in the linear guide groove 132, and the linear rib 532 is slidably fitted with the linear guide groove 132. On the one hand, the rotation of the first cylindrical cam 53 between the mounting seat 13 and the fixed seat 14 is limited, and on the other hand, the stability of the lifting motion of the first cylindrical cam 53 between the mounting seat 13 and the fixed seat 14 is improved.

Modification 2

As shown in fig. 7, the driving assembly 4 includes a speed reduction motor 61 and a third transmission shaft rod 62, the third transmission shaft rod 62 is vertically rotated and installed between the mounting seat 13 and the fixing seat 14, a third positioning piece 63 is coaxially and integrally formed on the third transmission shaft rod 62, the third positioning piece 63 is formed on the third transmission shaft rod 62 along the axial interval of the third transmission shaft rod 62 and has two pieces, the two third positioning pieces 63 are all embedded between the mounting seat 13 and the fixing seat 14, and the two third positioning pieces 63 are both in running fit with the mounting seat 13 and the fixing seat 14.

Gear motor 61 fixed mounting is in the upside of mount pad 13 and fixing base 14, and gear motor 61's organism is fixed by mount pad 13 and the cooperation centre gripping of fixing base 14, and gear motor 61's output shaft passes through the fixed coaxial fixed connection of shaft coupling with the top of third transmission axostylus axostyle 62, and the lower extreme of third transmission axostylus axostyle 62 is connected with the upper end coaxial welding fixed connection of rotation axis 32.

The reduction motor 61 is started to drive the third transmission shaft 62 to stably rotate and drive the rotating shaft 32 to rotate, so as to take the pedal 2 into the bottom of the frame 1 or rotate the pedal 2 from the bottom of the frame 1 to a proper position in front of the frame 1.

Modification 3

As shown in fig. 8, the driving assembly 4 drives the pedal structure 15 to move up and down while driving the pedal structure 15 to rotate horizontally. The drive assembly 4 comprises a fourth transmission shaft 71, a third operating handle 72 and a second cylindrical cam 73. The second cylindrical cam 73 is vertically and fixedly installed between the installation seat 13 and the fixed seat 14, and the installation seat 13 and the fixed seat 14 are matched to stably clamp the second cylindrical cam 73. The fourth transmission shaft lever 71 coaxially penetrates through the second cylindrical cam 73 and is in sliding fit with the second cylindrical cam in a rotating manner.

A second curved groove 731 is formed in a circumferential side wall of the second cylindrical cam 73, and a track of the second curved groove 731 surrounds a central axis of the second cylindrical cam 73. The outer side wall of the fourth transmission shaft 71 is provided with a matching roller 711, the matching roller 711 is embedded in the second curved groove 731, and the matching roller 711 is in rolling fit with the second curved groove 731. The third control handle 72 is fixedly welded to the fourth transmission shaft 71, and the bottom of the fourth transmission shaft 71 is fixedly welded to the top of the rotating shaft 32.

The worker rotates the fourth transmission shaft 71 through the third control handle 72, and the fourth transmission shaft 71 is lifted and lowered along the axial direction of the second cylindrical cam 73 by the cooperation of the second curved groove 731 and the cooperation roller 711 while rotating, so that the step 2 is rotated and swung between the bottom of the frame 1 and the front of the frame 1 along the horizontal direction and lifted and lowered. The user can put the foot when running-board 2 low level, and along with running-board 2 rebound, the position of foot progressively promotes, has solved the too high inconvenient problem of putting the foot of running-board 2, has improved the convenience that the user took.

Modification 4

As shown in fig. 9, the driving assembly 4 drives the pedal structure 15 to move up and down while driving the pedal structure 15 to rotate horizontally. The driving assembly 4 comprises a threaded sleeve 81, a fifth transmission shaft rod 82 and a fourth control handle 83, the threaded sleeve 81 is vertically installed between the mounting seat 13 and the fixed seat 14, and the threaded sleeve 81 is clamped and fixed by the mounting seat 13 and the fixed seat 14 in a matching manner.

The fifth transmission shaft 82 coaxially penetrates through the threaded sleeve 81, a threaded portion 821 is integrally formed on the fifth transmission shaft 82, and the threaded portion 821 is in threaded fit with the threaded sleeve 81. The fourth control handle 83 is welded and fixed on the top of the fifth transmission shaft rod 82, and the bottom of the fifth transmission shaft rod 82 is coaxially welded and fixed with the rotating shaft 32.

The staff drives the fifth transmission shaft lever 82 to rotate by rotating the fourth control handle 83, and the fifth transmission shaft lever 82 is meshed with the internal thread of the threaded sleeve 81 through the external thread of the threaded portion 821 to be matched and rotated, so that the fifth transmission shaft lever 82 can move up and down while rotating, and further the pedal 2 can swing and move up and down along the horizontal direction between the bottom of the frame 1 and the front portion of the frame 1. The user can put the foot when running-board 2 low level, and along with running-board 2 rebound, the position of foot progressively promotes, has solved the too high inconvenient problem of putting the foot of running-board 2, has improved the convenience that the user took.

Principle of operation

In operation, the driving component 4 drives the transmission shaft lever, and drives the pedal 2 to rotate and swing between the bottom of the frame 1 and the front part of the frame 1 through the rotating shaft 32 and the connecting swing rod 31, so that when the pedal 2 is opened forwards, an interference space formed by universal wheels can be bypassed, and the pedal 2 with larger left-right width can be designed, so that a user can put feet more comfortably; the pedal 2 is folded backwards to the bottom of the frame 1, the problem that the user gets in the wheelchair difficultly due to the obstruction of the pedal 2 is solved, and the convenience of the user in taking the wheelchair is improved.

In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.

The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the utility model. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.

Claims

1. A wheelchair with adjustable pedals is characterized by comprising a frame (1), a seat (11), wheels (12) and a pedal structure (15), wherein the seat (11) is installed on the frame (1), the wheels (12) are installed at the bottom of the frame (1), the pedal structure (15) is rotatably arranged at the front part of the frame (1), and a driving assembly (4) for driving the pedal structure (15) to rotate is arranged on the frame (1);

under the conventional state, the pedal structure (15) is horizontally hung at the bottom of the vehicle frame (1).

2. The wheelchair with the adjustable pedal plate as claimed in claim 1, wherein a mounting seat (13) is fixed at the front end of the frame (1), a fixed seat (14) is fixedly mounted at one side of the mounting seat (13) far away from the frame (1), the pedal structure (15) comprises a pedal plate (2) and a connecting assembly (3), the connecting assembly (3) comprises a connecting swing rod (31) and a rotating shaft (32), any end of the connecting swing rod (31) is fixedly connected with the pedal plate (2), the other end of the connecting swing rod (31) is fixedly connected with the rotating shaft (32), the rotating shaft (32) is vertically mounted between the mounting seat (13) and the fixed seat (14) and is respectively in rotating fit with the mounting seat and the fixed seat, and the upper end of the rotating shaft (32) is further connected with the driving assembly (4).

3. The wheelchair with adjustable pedals as claimed in claim 2, wherein the mounting seat (13) is provided with a groove (131) on the underside, the groove (131) is semicircular in shape, the rotating shaft (32) is provided with a rib (321), and the rib (321) is embedded in the groove (131) and is in sliding fit with the groove.

4. The wheelchair with adjustable footboard as claimed in claim 2, characterized in that, when the footboard (2) is located in front of the frame (1), the side of the footboard (2) facing away from the centre axis of the frame (1) is provided with a bend (21).

5. The wheelchair with adjustable footboard as claimed in claim 2, characterized in that the drive assembly (4) comprises a first transmission shaft (41) and a first operating handle (42), the upper end of the first transmission shaft (41) and the first operating handle (42) are fixedly connected, the first transmission shaft (41) is vertically installed between the mounting seat (13) and the fixed seat (14), the first transmission shaft (41) is respectively rotatably fitted with the mounting seat (13) and the fixed seat (14), and the lower end of the first transmission shaft (41) is coaxially and fixedly connected with the upper end of the rotating shaft (32).

6. The wheelchair with the adjustable pedals as claimed in claim 2, wherein the driving assembly (4) comprises a second transmission shaft (51), a second control handle (52) and a first cylindrical cam (53), the first cylindrical cam (53) is vertically installed between the mounting seat (13) and the fixing seat (14) and is in sliding fit with the mounting seat (13) and the fixing seat (14), the sliding direction of the first cylindrical cam (53) is the same as the axial direction of the first cylindrical cam (53), a first curve groove (531) surrounding the central axis of the first cylindrical cam (53) is formed on the peripheral side wall of the first cylindrical cam (53), and the second control handle (52) is fixedly connected to the top of the first cylindrical cam (53);

the second transmission shaft lever (51) is installed between the installation seat (13) and the fixed seat (14) and is in running fit with the installation seat and the fixed seat respectively, the second transmission shaft lever (51) coaxially penetrates into the first cylindrical cam (53) from bottom to top and is in running sliding fit with the first cylindrical cam, a moving roller (511) is arranged on the side wall of the second transmission shaft lever (51), the moving roller (511) is embedded in the first curve groove (531) and is in rolling fit with the first curve groove, and the lower end of the second transmission shaft lever (51) is coaxially and fixedly connected with the upper end of the rotating shaft (32).

7. The wheelchair with the adjustable pedal as claimed in claim 6, wherein the mounting seat (13) is provided with a linear guide groove (132), the length direction of the linear guide groove (132) is the same as the length direction of the first cylindrical cam (53), a linear rib (532) is fixedly arranged on the outer side wall of the first cylindrical cam (53), the linear rib (532) is embedded in the linear guide groove (132), and the linear rib (532) is in sliding fit with the linear guide groove (132).

8. The wheelchair with adjustable pedals as claimed in claim 2, wherein the driving assembly (4) comprises a speed reduction motor (61) and a third transmission shaft (62), the third transmission shaft (62) is vertically installed between the mounting seat (13) and the fixed seat (14) and is respectively in rotating fit with the mounting seat (13) and the fixed seat, the speed reduction motor (61) is fixedly installed on the upper side of the mounting seat (13), the output shaft of the speed reduction motor (61) is fixedly connected with the top end of the third transmission shaft (62), and the lower end of the third transmission shaft (62) is coaxially and fixedly connected with the upper end of the rotating shaft (32).

9. The wheelchair with adjustable pedals as claimed in claim 2, wherein the driving assembly (4) drives the pedal structure (15) to rotate and also drives the pedal structure (15) to move up and down, the driving assembly (4) comprises a fourth transmission shaft lever (71), a third control handle (72) and a second cylindrical cam (73), the second cylindrical cam (73) is vertically and fixedly installed between the mounting seat (13) and the fixed seat (14), and a second curved groove (731) surrounding the central axis of the second cylindrical cam (73) is formed on the peripheral side wall of the second cylindrical cam (73); the fourth transmission shaft lever (71) coaxially penetrates through the second cylindrical cam (73) and is in sliding fit with the second cylindrical cam in a rotating mode, a matching roller (711) is arranged on the outer side wall of the fourth transmission shaft lever (71), the matching roller (711) is embedded in the second curve groove (731) and is in rolling fit with the second curve groove, the third control handle (72) is fixedly connected with the top end of the fourth transmission shaft lever (71), and the lower end of the fourth transmission shaft lever (71) is coaxially and fixedly connected with the upper end of the rotating shaft (32).

10. The wheelchair with the adjustable pedals as claimed in claim 2, wherein the driving assembly (4) drives the pedal structure (15) to rotate and also drives the pedal structure (15) to move up and down, the driving assembly (4) comprises a threaded sleeve (81), a fifth transmission shaft (82) and a fourth control handle (83), the threaded sleeve (81) is vertically and fixedly installed between the mounting seat (13) and the fixing seat (14), the fifth transmission shaft (82) coaxially penetrates through the threaded sleeve (81) and is in threaded fit with the threaded sleeve, the fourth control handle (83) is fixedly connected with the top end of the fifth transmission shaft (82), and the lower end of the fifth transmission shaft (82) is fixedly connected with the rotating shaft (32).