Dual-purpose stretcher wheelchair

Abstract

The utility model discloses a dual-purpose stretcher wheelchair. The dual-purpose stretcher wheelchair comprises a leg leaning assembly, a seat cushion assembly, a backrest assembly, a first moving wheel assembly and a second moving wheel assembly. The leg leaning piece is connected with the seat cushion piece through a rotating bracket to support switching between a plane form and a 90-degree vertical form; the backrest piece is connected with the seat cushion through the independent support and can form a supporting state which is coplanar with the seat cushion or has an inclination angle of 100-130 degrees. The first moving wheel set is fixed to the leg leaning support, the second moving wheel set comprises a rotating support with an air cylinder, and the back attaching mode or the vertical standing mode is achieved through telescopic driving. When the seat cushion and the backrest are in a plane state and the second wheel set is in a vertical state, the connecting line of the farthest ends of the front and rear wheels is parallel to the plane of the main body to form a stable stretcher form; the wheelchair mode can be converted after reverse folding, and the dual requirements of patient transfer and daily movement are met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical equipment, in particular to a dual-purpose stretcher wheelchair. BACKGROUND

[0002] It is not easy to safely transfer bedridden old people from the bed to the wheelchair, and this difficulty leads most old people to fail to realize this simple but luxurious desire. Globally, including China, the traditional transfer process between the bed and the wheelchair mainly relies on the physical assistance of nursing staff, which is not only inefficient, has safety hazards, but also is likely to cause additional physical harm to the old people. Obviously, the traditional transfer method has been unable to meet the daily needs of modern disabled and semi-disabled bedridden old people.

[0003] In view of this, it is particularly urgent to develop a dual-purpose stretcher wheelchair, which aims to effectively solve the transfer problem of bedridden old people from the bedroom to outdoor activities, so that they can enjoy the outdoor time more safely and comfortably, thereby greatly improving their quality of life. CONTENT OF THE INVENTION

[0004] In order to solve the problems of the prior art, the purpose of the present application is to provide a dual-purpose stretcher wheelchair, which can be switched between the stretcher state and the wheelchair state, so as to facilitate the transfer of bedridden old people from the bedroom to outdoor activities, thereby improving the quality of life of bedridden old people.

[0005] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0006] The application provides a dual-purpose stretcher wheelchair, which comprises a leg-rest assembly, a seat cushion assembly, a back-rest assembly, a first moving wheel assembly and a second moving wheel assembly; the leg-rest assembly comprises a flat leg-rest piece and a leg-rest piece support for fixedly mounting the leg-rest piece; the seat cushion assembly comprises a flat seat cushion piece and a seat cushion piece support for fixedly mounting the seat cushion piece, the seat cushion piece support is rotationally connected with the leg-rest piece support, and the seat cushion piece support can rotate and be fixed relative to the leg-rest piece support, so that the seat cushion piece has a seat cushion piece state one in the same plane as the leg-rest piece and a seat cushion piece state two with a 90° angle with the leg-rest piece; the back-rest assembly comprises a flat back-rest piece and a back-rest piece support for fixedly mounting the back-rest piece, the back-rest piece support is rotationally connected with the seat cushion piece support, and the back-rest piece support can rotate and be fixed relative to the seat cushion piece support, so that the back-rest piece has a back-rest piece state one in the same plane as the seat cushion piece and a back-rest piece state two with a 90°-130° angle with the seat cushion piece; the first moving wheel assembly comprises a first moving wheel support and at least two first moving wheels, the first moving wheel support is fixedly connected to the leg-rest piece support, and the two first moving wheels are rotationally connected to the first moving wheel support; the second moving wheel assembly comprises a second moving wheel support, at least two second moving wheels and a cylinder, the second moving wheel support is rotationally connected to the back-rest piece support, the two second moving wheels are rotationally connected to the second moving wheel support, and the two ends of the cylinder are rotationally connected to the back-rest piece support and the second moving wheel support respectively, the cylinder drives the second moving wheel support to rotate, so that the second moving wheel support has a second moving wheel support state one close to the back-rest piece support and a second moving wheel support state two perpendicular to the back-rest piece support; when the seat cushion piece is in the seat cushion piece state one, the back-rest piece is in the back-rest piece state one, and the second moving wheel support is in the second moving wheel support state two, the line connecting the farthest end of the second moving wheel relative to the back-rest piece and the farthest end of the first moving wheel relative to the leg-rest piece is parallel to the leg-rest piece, the seat cushion piece and the back-rest piece.

[0007] As a preferred technical scheme, the dual-purpose stretcher wheelchair further comprises a third moving wheel assembly, the third moving wheel assembly comprises a third moving wheel support and at least two third moving wheels, the third moving wheel support is fixedly connected to the leg-rest piece support, and the two third moving wheels are rotationally connected to the third moving wheel support; the line connecting the farthest end of the third moving wheel relative to the back-rest piece and the farthest end of the first moving wheel relative to the back-rest piece is perpendicular to the leg-rest piece.

[0008] As a preferred technical scheme, the dual-purpose stretcher wheelchair further comprises a fourth moving wheel assembly, the fourth moving wheel assembly comprises a fourth moving wheel support and at least two fourth moving wheels, the fourth moving wheel support can rotate and be fixed relative to the backrest support, so that the fourth moving wheel support has a fourth moving wheel support state one close to the seat cushion support, a fourth moving wheel support state two perpendicular to the backrest, and a fourth moving wheel support state three between the fourth moving wheel support state one and the fourth moving wheel support state two; when the seat cushion is in the seat cushion state one, the backrest is in the backrest state one, and the fourth moving wheel support is in the fourth moving wheel support state two, a line connecting the farthest end of the fourth moving wheel relative to the backrest and the farthest end of the first moving wheel relative to the leg rest is parallel to the leg rest, the seat cushion and the backrest; when the seat cushion is in the seat cushion state two, the backrest is in the backrest state two, and the fourth moving wheel support is in the fourth moving wheel support state three, the line connecting the farthest end of the fourth moving wheel relative to the backrest and the farthest end of the first moving wheel relative to the backrest is perpendicular to the leg rest.

[0009] As a preferred technical scheme, the first moving wheel is connected with a driving motor for driving the first moving wheel to rotate.

[0010] As a preferred technical scheme, the third moving wheel support is in a T shape, and the two ends of the third moving wheel support are respectively connected with one third moving wheel.

[0011] As a preferred technical scheme, the leg rest support is fixedly provided with a first adjusting plate, the backrest support is fixedly provided with a second adjusting plate, the first adjusting plate and the second adjusting plate are provided with a plurality of pin holes, the seat cushion support is provided with a first pin hole close to the first adjusting plate and a second pin hole close to the second adjusting plate, a fixing pin is inserted into the pin hole on the first adjusting plate and the first pin hole to fix the leg rest support and the seat cushion support, and the fixing pin is inserted into the pin hole on the second adjusting plate and the second pin hole to fix the backrest support and the seat cushion support.

[0012] As a preferred technical scheme, the backrest support is fixedly provided with a third adjusting plate, the third adjusting plate is provided with a plurality of pin holes, the second moving wheel support is provided with a third pin hole, and a fixing pin is inserted into the pin hole on the third adjusting plate and the third pin hole to fix the backrest support and the second moving wheel support.

[0013] As a preferred technical scheme, the seat cushion support is fixedly provided with a second adjusting plate, the second adjusting plate is provided with a plurality of pin holes, the fourth moving wheel support is provided with a fourth pin hole, and a fixing pin is inserted into the pin hole on the second adjusting plate and the fourth pin hole to fix the seat cushion support and the fourth moving wheel support.

[0014] Compared with the prior art, the application has the following beneficial effects:

[0015] This application discloses a dual-purpose stretcher wheelchair that can switch between stretcher and wheelchair modes to facilitate the transfer of bedridden elderly people from their bedroom to the outdoors, thereby improving their quality of life. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of the dual-purpose stretcher wheelchair of this application;

[0017] Figure 2 This is a front view of the dual-purpose stretcher wheelchair of this application;

[0018] Figure 3 This is a structural schematic diagram of the dual-purpose stretcher wheelchair of this application in the wheelchair configuration;

[0019] Figure 4 This is a structural diagram of the dual-purpose stretcher wheelchair of this application when it is in stretcher mode;

[0020] The components are as follows: 1. Leg rest assembly; 11. Leg rest piece; 12. Leg rest piece bracket; 2. Seat cushion assembly; 21. Seat cushion piece; 22. Seat cushion piece bracket; 3. Backrest assembly; 31. Backrest piece; 32. Backrest piece bracket; 4. First moving wheel assembly; 41. First moving wheel bracket; 42. First moving wheel; 43. Drive motor; 5. Second moving wheel assembly; 51. Second moving wheel bracket; 52. Second moving wheel; 53. Cylinder; 6. First adjusting plate; 7. Second adjusting plate; 8. Third adjusting plate; 9. Third moving wheel assembly; 91. Third moving wheel bracket; 92. Third moving wheel; 10. Fourth moving wheel assembly; 101. Fourth moving wheel bracket; 102. Fourth moving wheel. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present application, the technical solutions in specific embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0022] like Figures 1-2 As shown, this application provides a dual-purpose stretcher wheelchair, which includes: a leg support assembly 1, a seat cushion assembly 2, a backrest assembly 3, a first moving wheel assembly 4, and a second moving wheel assembly 5.

[0023] The leg support assembly 1 includes a flat leg member 11 and a leg member bracket 12 for fixing the leg member 11.

[0024] The seat cushion assembly 2 includes a flat seat cushion member 21 and a seat cushion member bracket 22 for fixing the seat cushion member 21. The seat cushion member bracket 22 is rotatably connected to the leg support member bracket 12. The seat cushion member bracket 22 can rotate and be fixed relative to the leg support member bracket 12, so that the seat cushion member 21 has a state one where it is on the same plane as the leg support member 11 and a state two where it forms a 90° angle with the leg support member 11.

[0025] The backrest assembly 3 includes a flat backrest member 31 and a backrest member bracket 32 ​​for fixing the backrest member 31. The backrest member bracket 32 ​​is rotatably connected to the seat cushion member bracket 22. The backrest member bracket 32 ​​can rotate and be fixed relative to the seat cushion member bracket 22, so that the backrest member 31 has a state one where it is on the same plane as the seat cushion member 21 and a state two where it forms an angle of 90°-130° with the seat cushion member 21.

[0026] In this application, the seat cushion bracket 22 is rotated and fixed relative to the leg support bracket 12, and the backrest bracket 32 ​​is rotated and fixed relative to the seat cushion bracket by the following means: a first adjusting plate 6 is fixedly provided on the leg support bracket 12, and a second adjusting plate 7 is fixedly provided on the backrest bracket 32. The first adjusting plate 6 and the second adjusting plate 7 are provided with a plurality of pin holes. The seat cushion bracket 22 is provided with a first pin hole near the first adjusting plate 6 and a second pin hole near the second adjusting plate 7. A fixing pin is inserted into the pin hole and the first pin hole on the first adjusting plate 6 to fix the leg support bracket 12 and the seat cushion bracket 22. A fixing pin is inserted into the pin hole and the second pin hole on the second adjusting plate 7 to fix the backrest bracket 32 ​​and the seat cushion bracket 22.

[0027] It should be noted that the rotation and fixation of the seat cushion bracket 22 relative to the leg support bracket 12 and the rotation and fixation of the backrest bracket 32 ​​relative to the seat cushion bracket can also be achieved in other ways: for example, by driving the seat cushion bracket 22 to rotate relative to the leg support bracket 12 and the backrest bracket 32 ​​to rotate relative to the seat cushion bracket by a rotary motor or the like. The fixation of the seat cushion bracket 22 relative to the leg support bracket 12 and the backrest bracket 32 ​​relative to the seat cushion bracket is achieved by the reaction force of the rotary motor itself on its output shaft.

[0028] The first movable wheel assembly 4 includes a first movable wheel bracket 41 and at least two first movable wheels 42. The first movable wheel bracket 41 is fixedly connected to the leg rest bracket 12, and the two first movable wheels 42 are rotatably connected to the first movable wheel bracket 41.

[0029] The second movable wheel assembly 5 includes a second movable wheel bracket 51, at least two second movable wheels 52, and a cylinder 53. The second movable wheel bracket 51 is rotatably connected to the backrest bracket 32, and the two second movable wheels 52 are rotatably connected to the second movable wheel bracket 51. The two ends of the cylinder 53 are respectively rotatably connected to the backrest bracket 32 ​​and the second movable wheel bracket 51. The cylinder 53 drives the second movable wheel bracket 51 to rotate so that the second movable wheel bracket 51 has a state one of being close to the backrest bracket 32 ​​and a state two of being perpendicular to the backrest bracket 32.

[0030] It should be noted that the relative fixation between the second moving wheel bracket 51 and the backrest bracket 32 ​​can be achieved by the reaction force of the hydraulic pressure of the cylinder 53 on the second moving wheel bracket 51.

[0031] In a preferred embodiment, the relative fixation between the second movable wheel bracket 51 and the backrest bracket 32 ​​is further achieved by the following method: a third adjusting plate 8 is fixedly provided on the backrest bracket 32, the third adjusting plate 8 is provided with a plurality of pin holes, the second movable wheel bracket 51 is provided with a third pin hole, and a fixing pin is inserted into the pin holes and the third pin hole of the third adjusting plate 8 to fix the backrest bracket 32 ​​and the second movable wheel bracket 51.

[0032] When the seat cushion 21 is in state one, the backrest 31 is in state one, and the second moving wheel bracket 51 is in state two, the line connecting the farthest point of the second moving wheel 52 relative to the backrest 31 and the farthest point of the first moving wheel 42 relative to the leg rest 11 is parallel to the leg rest 11, the seat cushion 21, and the backrest 31. The purpose of this arrangement is to ensure that when the dual-purpose stretcher wheelchair is in stretcher mode, the support surface composed of the leg rest 11, the seat cushion 21, and the backrest 31 is parallel to the ground, thereby allowing bedridden elderly people to remain stable when lying flat on the support surface of the dual-purpose stretcher wheelchair.

[0033] like Figure 3 As shown, when the seat cushion 21 is in state two, the backrest 31 is in state two, and the second moving wheel bracket 51 is in state one, the dual-purpose stretcher wheelchair is in wheelchair mode.

[0034] like Figure 4 As shown, when the seat cushion 21 is in state one, the backrest 31 is in state one, and the second moving wheel bracket 51 is in state two, the dual-purpose stretcher wheelchair is in stretcher state.

[0035] Therefore, this application provides a dual-purpose stretcher wheelchair that can switch between stretcher and wheelchair modes to facilitate the transfer of bedridden elderly people from the bedroom to the outdoors, thereby improving their quality of life.

[0036] As a preferred technical solution, the dual-purpose stretcher wheelchair further includes a third moving wheel assembly 9, which is disposed on opposite sides of the first moving wheel assembly 4. The third moving wheel assembly 9 includes a third moving wheel bracket 91 and at least two third moving wheels 92.

[0037] The third movable wheel bracket 91 is fixedly connected to the leg rest bracket 12, and the two third movable wheels 92 are rotatably connected to the third movable wheel bracket 91. The line connecting the farthest end of the third movable wheel 92 relative to the backrest 31 and the farthest end of the first movable wheel 42 relative to the backrest 31 is perpendicular to the leg rest 11.

[0038] The third moving wheel assembly 9 serves the following functions:

[0039] 1. The dual-purpose stretcher wheelchair is in Figure 1 , Figure 2 When in the folded state shown, the third moving wheel assembly 9 allows the dual-purpose stretcher wheelchair to be placed stably.

[0040] 2. The dual-purpose stretcher / wheelchair is in Figure 3 When the wheelchair is in the position shown, the third moving wheel assembly 9 can improve the stability of the movement of the dual-purpose stretcher wheelchair;

[0041] 3. The dual-purpose stretcher / wheelchair is in Figure 4 When in the stretcher position shown, the third moving wheel assembly 9 can be used as a hanger.

[0042] Furthermore, the third movable wheel bracket 91 is T-shaped, and a third movable wheel 92 is connected to each end of the third movable wheel bracket 91.

[0043] As a preferred technical solution, the dual-purpose stretcher wheelchair further includes a fourth moving wheel assembly 10, which is disposed between the first moving wheel assembly 4 and the second moving wheel assembly 5. The fourth moving wheel assembly 10 includes a fourth moving wheel bracket 101 and at least two fourth moving wheels 102.

[0044] The fourth moving wheel bracket 101 can be rotated and fixed relative to the backrest bracket 32, so that the fourth moving wheel bracket 101 has a state one that is close to the seat cushion bracket 22, a state two that is perpendicular to the backrest 31, and a state three that is located between the fourth moving wheel bracket state one and the fourth moving wheel bracket state two.

[0045] In a preferred embodiment, the fourth movable wheel bracket 101 is rotated and fixed relative to the backrest bracket 32 ​​by means of the following: a second adjusting plate 7 is fixedly provided on the seat cushion bracket 22, the second adjusting plate 7 is provided with a plurality of pin holes, the fourth movable wheel bracket 101 is provided with a fourth pin hole, and a fixing pin is inserted into the pin holes and the fourth pin hole of the second adjusting plate 7 to fix the seat cushion bracket 22 and the fourth movable wheel bracket 101.

[0046] like Figure 4 As shown, when the seat cushion 21 is in state one, the backrest 31 is in state one, and the fourth moving wheel bracket 101 is in state two, the line connecting the farthest point of the fourth moving wheel 102 relative to the backrest 31 and the farthest point of the first moving wheel 42 relative to the leg rest 11 is parallel to the leg rest 11, the seat cushion 21, and the backrest 31. At this time, the fourth moving wheel assembly 10 enhances the stability of the dual-purpose stretcher wheelchair in stretcher mode.

[0047] like Figure 3 As shown, when the seat cushion 21 is in state two, the backrest 31 is in state two, and the fourth moving wheel bracket 101 is in state three, the line connecting the farthest point of the fourth moving wheel 102 relative to the backrest 31 and the farthest point of the first moving wheel 42 relative to the backrest 31 is perpendicular to the leg rest 11. At this time, the fourth moving wheel assembly 10 enhances the stability of the dual-purpose stretcher wheelchair in wheelchair mode.

[0048] As a preferred technical solution, the first movable wheel 42 is connected to a drive motor 43 for driving the rotation of the first movable wheel 42. Whether the dual-purpose stretcher / wheelchair is in wheelchair mode or stretcher mode, the first movable wheel 42 can be used as a drive wheel. It should be noted that the terms "first," "second," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, "a" or "one," and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. "Multiple" or "several" indicates at least two. Unless otherwise stated, "front," "rear," "left," "right," "lower," and / or "upper," and similar terms are for illustrative purposes only and are not limited to a single location or spatial orientation. The terms "comprising" or "including," and similar terms, mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, but do not exclude other elements or objects. The word “connection” or “link” is not limited to physical or mechanical connections, but can also include electrical connections, whether direct or indirect.

[0049] The singular forms “a,” “the,” and “the” used in this application specification and appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0050] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A dual purpose stretcher wheelchair, characterized in that, The dual-purpose stretcher wheelchair comprises: a leg-rest assembly including a flat leg-rest piece and a leg-rest piece support for fixedly mounting the leg-rest piece; a seat cushion assembly including a flat seat cushion piece and a seat cushion piece support for fixedly mounting the seat cushion piece, the seat cushion piece support being rotatably connected with the leg-rest piece support, the seat cushion piece support being rotatable and fixable relative to the leg-rest piece support so that the seat cushion piece has a seat cushion piece state one in the same plane as the leg-rest piece and a seat cushion piece state two at a 90° angle with the leg-rest piece; a back-rest assembly including a flat back-rest piece and a back-rest piece support for fixedly mounting the back-rest piece, the back-rest piece support being rotatably connected with the seat cushion piece support, the back-rest piece support being rotatable and fixable relative to the seat cushion piece support so that the back-rest piece has a back-rest piece state one in the same plane as the seat cushion piece and a back-rest piece state two at a 90°-130° angle with the seat cushion piece; a first moving wheel assembly including a first moving wheel support fixedly connected with the leg-rest piece support and at least two first moving wheels rotatably connected with the first moving wheel support; a second moving wheel assembly including a second moving wheel support rotatably connected with the back-rest piece support, at least two second moving wheels rotatably connected with the second moving wheel support, and a cylinder having two ends rotatably connected with the back-rest piece support and the second moving wheel support respectively, the cylinder driving the second moving wheel support to rotate so that the second moving wheel support has a second moving wheel support state one close to the back-rest piece support and a second moving wheel support state two perpendicular to the back-rest piece support; when the seat cushion piece is in the seat cushion piece state one, the back-rest piece is in the back-rest piece state one, and the second moving wheel support is in the second moving wheel support state two, a line connecting the farthest end of the second moving wheel relative to the back-rest piece and the farthest end of the first moving wheel relative to the leg-rest piece is parallel to the leg-rest piece, the seat cushion piece, and the back-rest piece.

2. The dual purpose stretcher wheelchair of claim 1, wherein, The dual-purpose stretcher wheelchair further comprises: a third moving wheel assembly including a third moving wheel support fixedly connected with the leg-rest piece support and at least two third moving wheels rotatably connected with the third moving wheel support; the third moving wheel is perpendicular to the line connecting the farthest end of the second moving wheel relative to the back-rest piece and the farthest end of the first moving wheel relative to the leg-rest piece.

3. The dual use stretcher wheelchair of claim 1, wherein, The dual-purpose stretcher wheelchair further comprises: a fourth moving wheel assembly, the fourth moving wheel assembly comprising a fourth moving wheel support and at least two fourth moving wheels, the fourth moving wheel support being rotatable and fixable relative to the backrest support so that the fourth moving wheel support has a fourth moving wheel support state one, a fourth moving wheel support state two and a fourth moving wheel support state three; when the seat cushion is in the seat cushion state one, the backrest is in the backrest state one and the fourth moving wheel support is in the fourth moving wheel support state two, a line connecting the most distal end of the fourth moving wheel relative to the backrest and the most distal end of the first moving wheel relative to the leg rest is parallel to the leg rest, the seat cushion and the backrest; when the seat cushion is in the seat cushion state two, the backrest is in the backrest state two and the fourth moving wheel support is in the fourth moving wheel support state three, a line connecting the most distal end of the fourth moving wheel relative to the backrest and the most distal end of the first moving wheel relative to the backrest is perpendicular to the leg rest.

4. The dual use stretcher wheelchair of claim 1, wherein, The first moving wheel is connected with a driving motor for driving the first moving wheel to rotate.

5. The dual purpose stretcher wheelchair of claim 2, wherein, The third moving wheel support is in T shape, and the two ends of the third moving wheel support are respectively connected with one third moving wheel.

6. The dual use stretcher wheelchair of claim 1 wherein, The leg rest support is fixedly provided with a first adjusting plate, the backrest support is fixedly provided with a second adjusting plate, the first adjusting plate and the second adjusting plate are provided with a plurality of pin holes, the seat cushion support is provided with a first pin hole close to the first adjusting plate and a second pin hole close to the second adjusting plate, and a fixing pin is inserted into the pin holes of the first adjusting plate and the first pin hole to fix the leg rest support and the seat cushion support, and a fixing pin is inserted into the pin holes of the second adjusting plate and the second pin hole to fix the backrest support and the seat cushion support.

7. The dual use stretcher wheelchair of claim 1 wherein, The backrest support is fixedly provided with a third adjusting plate, the third adjusting plate is provided with a plurality of pin holes, the second moving wheel support is provided with a third pin hole, and a fixing pin is inserted into the pin holes of the third adjusting plate and the third pin hole to fix the backrest support and the second moving wheel support.

8. The dual use stretcher wheelchair of claim 3, wherein, The seat cushion support is fixedly provided with a second adjusting plate, the second adjusting plate is provided with a plurality of pin holes, the fourth moving wheel support is provided with a fourth pin hole, and a fixing pin is inserted into the pin holes of the second adjusting plate and the fourth pin hole to fix the seat cushion support and the fourth moving wheel support.

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