Wheelchair

Abstract

A wheelchair, comprising a seat cushion (10), a chair back (20), armrests (40), a mounting bracket (51), a first connecting rod (62) and a second connecting rod (63), wherein a first end of the mounting bracket (51) is connected to a rear end of the seat cushion (10), and a second end of the mounting bracket (51) is provided with a first connecting portion (61) and a second connecting portion (53); a first end of the first connecting rod (62) is rotatably connected to the first connecting portion (61) to form a first axis, and a second end of the first connecting rod (62) is rotatably connected to a second end of the second connecting rod (63) to form a second axis; and a first end of the second connecting rod (63) is rotatably connected to one side of the chair back (20) and the armrests (40) to form a third axis, and a first end of the chair back (20) is rotatably connected to the second connecting portion (53) to form a fourth axis. The first axis, the second axis, the third axis and the fourth axis all extend in a width direction and are arranged in parallel, and form four projection points on a projection plane. The four projection points are connected in sequence on the projection plane to form a quadrangle, and thus the armrests (40) can be prevented from rotating downwards when being folded, thereby meeting the requirement of a user getting on and off the wheelchair from the side of a seat thereof.

Description

A wheelchair Technical Field

[0001] The present invention relates to the technical field of travel tools, and in particular to a wheelchair. Background Art

[0002] Currently, wheelchairs are used as mobility aids, particularly for elderly individuals with mobility issues or those with leg injuries. To facilitate folding and storage, the backrest, armrests, and seat cushion are connected by a folding mechanism that pivots to accommodate the armrests. The armrests are located on either side of the seat, but the folding structure connecting the seat cushion and armrests prevents users from getting in and out of the wheelchair from the side of the seat. Furthermore, during the folding process, the front end of the armrests can easily rotate downward, potentially causing damage from impact with the ground or a collision with the user, potentially leading to safety accidents.

[0003] Summary of the Invention

[0004] The purpose of the present invention is to provide a wheelchair that can prevent the armrests from rotating downward during the folding process, thereby improving the safety of use and meeting the needs of users to get on and off the wheelchair at the side of the seat.

[0005] In order to achieve the above-mentioned object, the present invention provides a wheelchair comprising a seat cushion, a backrest, armrests and a folding bracket;

[0006] The folding bracket includes a mounting bracket, a first connecting rod and a second connecting rod, the first end of the mounting bracket is connected to the seat cushion, the second end of the mounting bracket is provided with a first connecting portion and a second connecting portion, the first end of the first connecting rod is rotatably connected to the first connecting portion to form a first axis, the second end of the first connecting rod is rotatably connected to the second end of the second connecting rod to form a second axis, the seat back and the armrest are both rotatably connected to the first end of the second connecting rod to form a third axis, and the seat back is rotatably connected to the second connecting portion to form a fourth axis;

[0007] Among them, the first axis, the second axis, the third axis and the fourth axis all extend along the width direction and are arranged in parallel, and the first axis, the second axis, the third axis and the fourth axis are respectively projected onto the projection surface along the width direction to form a first projection point, a second projection point, a third projection point and a fourth projection point, and the first projection point, the second projection point, the third projection point and the fourth projection point are sequentially connected on the projection surface to form a quadrilateral.

[0008] As a preferred solution, the mounting bracket includes a bottom link and a side link, the first end of the bottom link is fixedly connected to the rear end of the seat cushion, the first end of the side link is fixed to the outer side surface of the bottom link in the width direction, the first connecting portion is arranged at the second end of the side link, and the second connecting portion is arranged at the second end of the bottom link.

[0009] As a preferred embodiment, the side link includes a fixed portion and an extension portion, the fixed portion is fixedly connected to the second end of the bottom link, the first end of the extension portion is connected to the fixed portion, the second end of the extension portion is tilted backward, and the first connection portion is arranged on the extension portion.

[0010] As a preferred embodiment, the chair back includes a backrest board and a backrest bracket, the back side of the backrest board is connected to the backrest bracket, the first end of the backrest bracket is provided with a folding connection part and a first matching part, the bottom connecting rod is provided with a second matching part, the folding connection part is rotatably connected to the second connection part, and the first matching part and the second matching part are detachably connected.

[0011] As a preferred solution, the first matching portion is located behind the folding connecting portion, and the second matching portion is located behind the second connecting portion.

[0012] As a preferred solution, the first matching portion and the second matching portion are snap-fitted together.

[0013] As a preferred solution, the second end of the bottom link extends backward and protrudes to form the second matching portion, the second matching portion includes a lower boss, and the lower boss forms an upper limit surface on a side facing away from the seat cushion. The first end of the seat back bracket extends forward to form the folding connection portion, and the first matching portion includes a buckle and a lower limit surface, a slot is formed between the buckle and the lower limit surface, the lower boss can be embedded in the slot, and the upper limit surface abuts against the lower limit surface.

[0014] As a preferred solution, the second end of the bottom link is connected to forward-extending transfer arms on both sides in the width direction, the transfer arms are the second connecting parts, and the folding connecting part is rotatably connected between the two transfer arms.

[0015] As a preferred embodiment, the chair back support includes a supporting beam and a supporting arm, the second end of the supporting arm is connected to the bottom of the supporting beam, the folding connection part and the first matching part are arranged at the first end of the supporting arm, the back side of the backrest board is connected to the supporting beam, and the first end of the second connecting rod and the armrest are rotatably connected to the end of the supporting beam in the width direction.

[0016] As a preferred embodiment, the second connecting rod and the rear end of the armrest are coaxially connected to one side of the chair back in the width direction, and the chair back is provided with an armrest limit block on one side in the width direction, and one end of the armrest limit block is provided with a first armrest limit surface, the second connecting rod is provided with an armrest transmission block, and one end of the armrest transmission block is provided with a first armrest transmission surface, the armrest is provided with a state limit block, and one end of the state limit block is provided with a first state limit surface, the armrest includes a use state and a folding state, when the armrest is in the use state, the first armrest limit surface abuts against the first state limit surface, and there is a gap between the first armrest transmission surface and the first state limit surface, and when the armrest is in the folding state, the first armrest transmission surface abuts against the first state limit surface, and the first armrest limit surface is separated from the first state limit surface.

[0017] As a preferred solution, the other end of the armrest limit block is provided with a second armrest limit surface, the other end of the armrest transmission block is provided with a second armrest transmission surface, and the other end of the state limit block is provided with a second state limit surface. When the armrest is flipped up in the use state, the second state limit surface abuts against the second armrest limit surface, and there is a gap between the second state limit surface and the second armrest transmission surface. When the armrest is in the folded state, the second state limit surface abuts against the second armrest limit surface.

[0018] As a preferred solution, when the armrest is in the folded state, the second state limiting surface abuts against the second armrest limiting surface.

[0019] As a preferred embodiment, the side of the chair back protrudes to form a connecting column, the first end of the second connecting rod protrudes along the axial direction of the connecting column to form a mounting ring, the rear end of the armrest is provided with a connecting hole, the mounting ring is sleeved on the outer circumferential surface of the connecting column, the connecting column is installed in the connecting hole, the connecting column, the mounting ring and the connecting hole are coaxially arranged, and a limiting ring is provided at the end of the connecting column, and the inner end face of the limiting ring in the axial direction abuts against the armrest.

[0020] Compared with the prior art, the wheelchair of the present invention has the following advantages: the backrest is located behind the seat, and the armrests are located on both sides of the seat cushion. When using the wheelchair, the user sits on the seat cushion, leans against the backrest, and places their hands on the armrests. The seat cushion, backrest, and armrests are folded by folding brackets, reducing the space occupied by the wheelchair and facilitating storage. Specifically, the folding bracket includes a mounting bracket, a first connecting rod and a second connecting rod. The mounting bracket of the folding bracket is connected to the rear end of the seat cushion. The second end of the mounting bracket is provided with a first connecting portion and a second connecting portion. The first end of the first connecting rod is rotatably connected to the first connecting portion, the second end of the first connecting rod is rotatably connected to the second end of the second connecting rod, and the first end of the second connecting rod is rotatably connected to one side of the seat back and the armrest respectively. When the wheelchair is in use, the mounting bracket is located at the rear end of the seat cushion, the first connecting rod extends upward on the basis of the second end of the mounting bracket, and the second connecting rod extends forward to one side of the seat back relative to the first connecting rod. Therefore, the folding bracket is located at the rear end of the seat, and the armrest, the mounting bracket and the seat form a side activity channel on the side of the wheelchair. The folding bracket does not occupy the side space of the seat, reduces the interference of the activity space on the side of the wheelchair, and makes the side activity channel have a larger activity space, thereby improving the safety of the user getting on and off the wheelchair on the side. When folded, the mounting bracket is fixed to the rear end of the seat cushion, the seat back is rotatably connected to the second connecting portion on the mounting bracket, the first end of the second connecting rod is rotatably connected to the seat back and the armrest, and the seat back rotates forward, driving the first end of the second connecting rod to move forward through the seat back. Since the second end of the second connecting rod is rotatably connected to the first connecting portion of the mounting bracket through the first connecting rod, the second end of the second connecting rod rotates backward, and the first end of the second connecting rod drives the armrest to rotate synchronously from bottom to top. In the folded state and the use state, the first axis, the second axis, the third axis and the fourth axis all extend in the width direction and are arranged in parallel. The first axis, the second axis, the third axis and the fourth axis are projected onto the projection surface along the width direction to form a first projection point, a second projection point, a third projection point and a fourth projection point, respectively. The first projection point, the second projection point, the third projection point and the fourth projection point are sequentially connected on the projection surface to form a quadrilateral, so that the armrest can maintain a basically unchanged angle when the seat back is in use and in the folded state, thereby preventing the armrest from rotating and colliding with the ground after folding, causing damage, or causing a danger of use, thereby improving safety in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG1 is a schematic diagram of the overall structure of an embodiment of the present invention.

[0022] FIG2 is a structural diagram of a chair back and a seat cushion in use according to an embodiment of the present invention.

[0023] FIG3 is a schematic structural diagram of a foldable bracket according to an embodiment of the present invention.

[0024] FIG4 is a schematic structural diagram of a mounting bracket according to an embodiment of the present invention.

[0025] FIG5 is a schematic structural diagram of a chair back according to an embodiment of the present invention.

[0026] FIG6 is a schematic structural diagram of an armrest according to an embodiment of the present invention.

[0027] FIG. 7 is a schematic structural diagram of a second connecting rod according to an embodiment of the present invention.

[0028] FIG8 is an enlarged structural cross-sectional view of point A in FIG1 according to an embodiment of the present invention.

[0029] FIG9 is a schematic structural diagram of the armrest extending in the vertical direction in the use state according to an embodiment of the present invention.

[0030] FIG10 is an enlarged structural cross-sectional view of point B in FIG8 according to an embodiment of the present invention.

[0031] FIG11 is a schematic structural diagram of an embodiment of the present invention in a folded state.

[0032] FIG12 is an enlarged structural cross-sectional view of point C in FIG10 according to an embodiment of the present invention.

[0033] 13 is a structural diagram of the chair back and seat cushion in a folded state according to an embodiment of the present invention.

[0034] In the picture:

[0035] 10. Seat cushion;

[0036] 20. Chair back; 21. Backrest; 22. Chair back support; 23. Support beam; 24. Connecting column; 25. Armrest stopper; 26. First armrest stopper surface; 27. Second armrest stopper surface; 28. Support arm; 29. ​​Folding connection portion; 30. First mating portion; 31. Buckle; 32. Lower stopper surface; 33. Stop ring;

[0037] 40. Armrest; 41. State limit block; 42. First state limit surface; 43. Second state limit surface; 44. Connection hole;

[0038] 50. Folding bracket; 51. Mounting bracket; 52. Bottom link; 53. Second connecting portion; 54. Transfer arm; 55. Second matching portion; 56. Upper limit surface; 57. Lower boss; 58. Side link; 59. Fixing portion; 60. Extension portion; 61. First connecting portion; 62. First link; 63. Second link; 64. Handrail transmission block; 65. First handrail transmission surface; 66. Second handrail transmission surface; 67. Mounting ring. DETAILED DESCRIPTION

[0039] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0040] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" used in the present invention to indicate the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0041] In the description of the present invention, it should be understood that the terms "connected," "connected," "fixed," etc. used in the present invention should be interpreted broadly. For example, the terms may be fixedly connected, detachably connected, or integrated; may be mechanically connected or welded; may be directly connected or indirectly connected through an intermediate medium; may be internal communication between two elements or an interactive relationship between two elements, unless otherwise clearly defined. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] As shown in Figures 1 to 12, a wheelchair according to a preferred embodiment of the present invention includes a seat cushion 10, a seat back 20, an armrest 40 and a folding bracket 50. The folding bracket 50 includes a mounting bracket 51, a first connecting rod 62 and a second connecting rod 63. The first end of the mounting bracket 51 is connected to the rear end of the seat cushion 10, and the second end of the mounting bracket 51 is provided with a first connecting portion 61 and a second connecting portion 53. The first end of the first connecting rod 62 is rotatably connected to the first connecting portion 61 to form a first axis, and the second end of the first connecting rod 62 is rotatably connected to the second end of the second connecting rod 63 to form a second axis. The first end of the connecting rod 63 is rotatably connected to one side of the seat back 20 and the armrest 40 to form a third axis, and the first end of the seat back 20 is rotatably connected to the second connecting portion 53 to form a fourth axis. The first axis, the second axis, the third axis and the fourth axis all extend in the width direction and are arranged in parallel. The first axis, the second axis, the third axis and the fourth axis are projected onto the projection surface along the width direction to form a first projection point, a second projection point, a third projection point and a fourth projection point. The first projection point, the second projection point, the third projection point and the fourth projection point are connected in sequence on the projection surface to form a quadrilateral.

[0043] It should be noted that the first end is the end of the component close to the ground when the chair back 20 is in use, and the second end is the end of the component away from the ground when the chair back 20 is in use.

[0044] In the wheelchair of the present invention, the backrest 20 is located behind the seat, and the armrests 40 are located on both sides of the seat cushion 10. When using the wheelchair, the user sits on the seat cushion 10, leans against the backrest 20, and places both hands on the armrests 40. The seat cushion 10, backrest 20, and armrests 40 are folded by folding brackets 50 to reduce the space occupied by the wheelchair and facilitate storage. Specifically, the folding bracket 50 includes a mounting bracket 51, a first connecting rod 62 and a second connecting rod 63. The mounting bracket 51 of the folding bracket 50 is connected to the rear end of the seat cushion 10. The second end of the mounting bracket 51 is provided with a first connecting portion 61 and a second connecting portion 53. The first end of the first connecting rod 62 is rotatably connected to the first connecting portion 61, and the second end of the first connecting rod 62 is rotatably connected to the second end of the second connecting rod 63. The first end of the second connecting rod 63 is rotatably connected to one side of the seat back 20 and the armrest 40 respectively. When the wheelchair is in use, the mounting bracket 51 is located at the rear end of the seat cushion 10, the first connecting rod 62 extends upward based on the second end of the mounting bracket 51, and the second connecting rod 63 extends forward relative to the first connecting rod 62 to one side of the seat back 20. Therefore, the folding bracket 50 is located at the rear end of the seat cushion 10, and the armrest 40, the mounting bracket 51 and the seat form a side activity channel on the side of the wheelchair. The folding bracket 50 does not occupy the side space of the wheelchair, reduces interference with the activity space on the side of the wheelchair, and provides a larger activity space for the side activity channel, thereby improving the safety of the user getting on and off the wheelchair from the side. When folding, the mounting bracket 51 is fixed to the rear end of the seat cushion 10, the seat back 20 is rotatably connected to the second connecting portion 53 on the mounting bracket 51, and the first ends of the second connecting rods 63 are rotatably connected to the seat back 20 and the armrest 40 respectively. The seat back 20 rotates forward, and the first end of the second connecting rod 63 moves forward through the seat back 20. Since the second end of the second connecting rod 63 is rotatably connected to the first connecting portion 61 of the mounting bracket 51 through the first connecting rod 62, and then the second end of the second connecting rod 63 rotates backward, the first end of the second connecting rod 63 drives the armrest 40 to rotate synchronously from bottom to top. When the seat back 20 is in the folded state and in use state, the first end of the second connecting rod 63 is rotatably connected to the armrest 40 from bottom to top. The first axis, the second axis, the third axis and the fourth axis all extend in the width direction and are arranged in parallel. The first axis, the second axis, the third axis and the fourth axis are respectively projected onto the projection surface along the width direction to form a first projection point, a second projection point, a third projection point and a fourth projection point. The first projection point, the second projection point, the third projection point and the fourth projection point are connected in sequence on the projection surface to form a quadrilateral, so that the armrest 40 can maintain a basically unchanged angle when the chair back 20 is in use and in the folded state, thereby avoiding the armrest 40 from rotating and colliding with the ground after folding, causing damage, or causing danger of use, thereby improving safety of use.

[0045] As one embodiment, the first axis, the second axis, the third axis and the fourth axis are projected onto the projection surface along the width direction to form a first projection point, a second projection point, a third projection point and a fourth projection point, respectively. The first projection point, the second projection point, the third projection point and the fourth projection point are connected in sequence on the projection surface to form a parallelogram. When the seat back 20 is folded or unfolded relative to the seat cushion 10, the operation is smoother and more stable, and the safety of use is high.

[0046] Furthermore, as shown in FIG4 , the mounting bracket 51 includes a bottom link 52 and a side link 58. The first end of the bottom link 52 is fixedly connected to the rear end of the seat cushion 10. The first end of the side link 58 is fixed to the outer side surface of the bottom link 52 in the width direction. A first connecting portion 61 is provided at the second end of the side link 58, and a second connecting portion 53 is provided at the second end of the bottom link 52. The side link 58 is connected to the outer side surface of the bottom link 52 in the width direction. The first connecting portion 61 is provided at the second end of the side link 58. The first connecting portion 62 is connected to the first connecting portion 61. The armrest 40 is rotatably connected to the first connecting portion 62 via the second connecting portion 63 to maintain a constant angle of the armrest 40. The second connecting portion 53 is provided at the second end of the bottom link 52. The first end of the seat back 20 is connected to the second connecting portion 53 to enable the seat back 20 to fold. The structures for folding the seat back 20 and maintaining the angle of the armrest 40 are staggered in the width direction to avoid interference during rotation, thereby making the folding process of the seat back 20 smoother.

[0047] Furthermore, as shown in Figures 3 and 4, the side link 58 includes a fixing portion 59 and an extension portion 60. The fixing portion 59 is fixedly connected to the second end of the bottom link 52. The first end of the extension portion 60 is connected to the fixing portion 59. The second end of the extension portion 60 is tilted rearward. A first connecting portion 61 is provided on the extension portion 60. The first end of the side link 58 is fixedly connected to the second end of the bottom link 52 via the fixing portion 59. The second end of the side link 58 is tilted rearward. The line connecting the first axis and the fourth axis on the projection plane extending in the front-to-back direction is tilted rearward. At the same time, the line connecting the second axis and the third axis on the projection plane extending in the front-to-back direction is also tilted rearward. The extension portion 60 and the second link 63 are both tilted rearward to avoid occupying the side space of the seat cushion 10, leaving more room for movement on the side of the seat cushion 10.

[0048] Furthermore, as shown in Figure 5, the chair back 20 includes a backrest plate 21 and a backrest bracket 22. The back of the backrest plate 21 is connected to the backrest bracket 22. The first end of the backrest bracket 22 is provided with a folding connection portion 29 and a first mating portion 30. The second end of the bottom link 52 is provided with a second mating portion 55. The folding connection portion 29 is rotatably connected to the second connection portion 53, and the first mating portion 30 is detachably connected to the second mating portion 55. When a user sits in the wheelchair, their back rests against the backrest plate 21. The back of the backrest plate 21 is connected to the backrest bracket 22, which provides support for the backrest plate 21. The backrest bracket 22 is a frame structure that provides sufficient support strength while reducing the overall weight of the wheelchair, saving materials, and lowering production costs. The bottom link 52 is fixed to the seat cushion 10. The backrest bracket 22 is rotatably connected to the second connection portion 53 of the bottom link 52 via the folding connection portion 29, allowing the backrest bracket 22 to rotate relative to the seat cushion 10 to fold. The chair back bracket 22 is provided with a first matching portion 30, and the bottom connecting rod 52 is provided with a second matching portion 55. The first matching portion 30 and the second matching portion 55 are detachably connected. When the chair back bracket 22 is rotated to the use state, the first matching portion 30 and the second matching portion 55 are connected to achieve the fixation of the chair back 20 and the bottom connecting rod 52, preventing the chair back 20 from being accidentally folded and causing danger in use, thereby improving the safety of use.

[0049] Furthermore, as shown in Figures 1 to 5, the first matching portion 30 is located behind the folding connection portion 29, and the second matching portion 55 is located behind the second connection portion 53. The folding connection portion 29 is rotatably connected to the second connection portion 53. The first matching portion 30 and the second matching portion 55 are arranged behind the rotation of the folding connection portion 29 and the second connection portion 53, and are located far behind the seat cushion 10, so as to avoid the chair back 20 from being accidentally folded, which may cause danger in use, thereby improving safety in use.

[0050] Furthermore, as shown in Figures 1 to 5, the first mating portion 30 is engaged with the second mating portion 55. The engaging engagement is simple and easy to operate, while also being highly efficient, improving the operating experience of switching the wheelchair between the folded state and the usable state.

[0051] Furthermore, as shown in Figures 1 to 5, the second end of the bottom link 52 extends backward and protrudes to form a second matching portion 55, and the second matching portion 55 includes a lower boss 57. The lower boss 57 forms an upper limit surface 56 on the side facing away from the seat cushion 10. The first end of the seat back bracket 22 extends forward to form a folding connection portion 29. The first matching portion 30 includes a buckle 31 and a lower limit surface 32. A slot is formed between the buckle 31 and the lower limit surface 32. The lower boss 57 can be embedded in the slot, and the upper limit surface 56 abuts against the lower limit surface 32. The upper limit surface 56 of the bottom link 52 faces upward, and the lower limit surface 32 of the seat back 20 faces downward. The upper limit surface 56 abuts against the lower limit surface 32 to limit the seat back bracket 22, preventing the seat back bracket 22 from rotating excessively backward, so that the backrest board 21 is maintained at a set angle when in use. At the same time, the force of the seat back bracket 22 acts on the upper limit surface 56, and the seat back bracket 22 is supported only by the bottom link 52, while the side link 58, the first link 62 and the second link 63 are in a stress-free state. The side link 58, the first link 62 and the second link 63 are not easy to break, thereby extending the service life of the side link 58, the first link 62 and the second link 63.

[0052] Furthermore, as shown in Figures 1 to 5, the second end of the bottom link 52 is connected to forward-extending transfer arms 54 on both sides in the width direction. The transfer arms 54 are the second connecting part 53. The folding connecting part 29 is rotatably connected between the two transfer arms 54. The transfer arms 54 on both sides of the folding connecting part 29 are used to limit the width direction. At the same time, the two transfer arms 54 provide installation space for the folding rotating part.

[0053] As one embodiment, the front end of the lower limit surface 32 is connected to the rear end of the transfer arm 54, and the front end of the upper limit surface 56 is connected to the folding connection part 29. When in use, the buckle 31 is clamped on the lower boss 57, and the upper limit surface 56 presses against the lower limit surface 32. The upper limit surface 56 provides support for the lower limit surface 32. The side link 58, the first link 62 and the second link 63 are in a stress-free state. The side link 58, the first link 62 and the second link 63 are not easy to break, which extends the service life of the side link 58, the first link 62 and the second link 63. The buckle 31 and the lower boss 57 are respectively located behind the transfer arm 54 and the folding connection part 29, away from the user, to avoid misoperation and improve safety of use. At the same time, the lower limit surface 32 and the upper limit surface 56 serve as a support and limit mechanism, simplifying the structural design of the support and limit mechanism. The folding connection portion 29 and the transfer arm 54 form a rotating structure via a rotating shaft extending along the width direction. The front end of the support and limit structure is connected to the rear end of the rotating structure to form the folding structure. The distance between the support and limit structure and the rotating structure is short, which facilitates the miniaturization of the folding structure. To convert the seat from the use state to the folded state, the connection between the buckle 31 and the lower boss 57 is simply opened, and the backrest 21 is pushed forward. The upper limit surface 56 separates from the lower limit surface 32, and the folding connection portion 29 rotates about the front end of the transfer arm 54 to complete the folding of the seat.

[0054] Furthermore, as shown in Figure 5, the chair back bracket 22 includes a support beam 23 and a support arm 28, the second end of the support arm 28 is connected to the bottom of the support beam 23, the folding connection portion 29 and the first matching portion 30 are arranged at the first end of the support arm 28, the back side of the backrest plate 21 is connected to the support beam 23, and the first end of the second connecting rod 63 and the armrest 40 are rotatably connected to the end of the support beam 23 in the width direction. The support beam 23 extends roughly in the width direction, and the support arm 28 extends roughly in the vertical direction. The back of the backrest board 21 is connected to the support beam 23. When in use, the user leans on the backrest board 21, and the force in the backrest board 21 is transmitted to the support arm 28 through the support beam 23. The folding connection part 29 and the first matching part 30 are arranged at the first end of the support arm 28. The force is transmitted to the bottom connecting rod 52 through the support arm 28, and the force of the chair back bracket 22 is borne by the bottom connecting rod 52, reducing the force transmission components and force-bearing components. The support structure is simple, which helps to reduce costs and after-sales maintenance costs while improving safety in use. At the same time, the first end of the second link 63 and the armrest 40 are rotatably connected to the end of the supporting beam 23 in the width direction. When folded, the supporting beam 23 moves forward, and the second end of the second link 63 is driven to rotate downward through the first link 62. The first end of the second link 63 rotates upward, thereby causing the armrest 40 to rotate upward while the beam rotates downward, so that the angle of the armrest 40 can be maintained basically unchanged during use and after folding. The armrest 40 and the second link 63 are connected to the supporting beam 23, which is convenient for after-sales maintenance and replacement.

[0055] In one embodiment, a first groove is formed on the side of the first connecting rod 62 facing the support beam 23, and the support beam 23 is mounted in the first groove. The first connecting rod 62 is located on the inner side of the chair back 20 in the width direction, which helps to miniaturize the wheelchair while reducing interference during use and improving safety.

[0056] As one embodiment, the support beam 23 and the support arm 28 are an integrally formed structure, which serves as the support and force transmission components of the backrest plate 21, and is also the force transmission component of the second connecting rod 63 and the armrest 40. The support beam 23 and the support arm 28 are an integrally formed structure, which helps to improve the structural stability of the chair back bracket 22, and at the same time helps to improve the after-sales replacement and maintenance efficiency as well as the production and assembly efficiency.

[0057] As one embodiment, two support arms 28 are respectively provided on both sides of the support beam 23 along the width direction, and bottom connecting rods 52 connected to the support arms 28 are respectively provided at corresponding positions of the seat cushion 10, which can meet the support requirements and reduce production costs.

[0058] Furthermore, as shown in Figures 8 to 13, the rear ends of the second connecting rod 63 and the armrest 40 are coaxially connected to one side of the chair back 20 in the width direction. The chair back 20 is provided with an armrest limit block 25 on one side in the width direction, and one end of the armrest limit block 25 is provided with a first armrest limit surface 26. The second connecting rod 63 is provided with an armrest transmission block 64, and one end of the armrest transmission block 64 is provided with a first armrest transmission surface 65. The armrest 40 is provided with a state limit block 41, and one end of the state limit block 41 is provided with a first state limit surface 42. The armrest 40 includes a use state and a folded state. When the armrest 40 is in the use state, the first armrest limit surface 26 abuts against the first state limit surface 42, and there is a gap between the first armrest transmission surface 65 and the first state limit surface 42. When the armrest 40 is in the folded state, the first armrest transmission surface 65 abuts against the first state limit surface 42, and the first armrest limit surface 26 is separated from the first state limit surface 42. When in use, the first armrest limiting surface 26 abuts against the first state limiting surface 42. The first armrest limiting surface 26 only needs to limit the first state limiting surface 42 to prevent the front end of the armrest 40 from rotating downward, so that the armrest 40 remains roughly horizontal. There is a gap between the first armrest transmission surface 65 and the first state limiting surface 42. The force acting on the armrest 40 when in use only acts on the first armrest limiting surface 26, and the first armrest transmission surface 65 is not subjected to force, that is, the second connecting rod 63 is not subjected to force. When the armrest 40 is in the folded state, the first armrest transmission surface 65 abuts the first state limit surface 42. The second link 63 and the rear end of the armrest 40 are rotatably connected to one side of the seat back 20. When the seat back 20 is folded, the second end of the second link 63 rotates downward, causing the first end of the second link 63 to rotate counterclockwise around the seat back 20. The first armrest transmission surface 65 abuts the first state limit surface 42. When the seat back 20 rotates downward, the first armrest transmission surface 65 drives the first state limit surface 42 to rotate counterclockwise, causing the armrest 40 to rotate upward simultaneously with the seat back 20, thereby maintaining the armrest 40 in a substantially horizontal position. The side links 58, first link 62, and second link 63 are only subjected to force in the folded state and are not subjected to force when in use. This prevents breakage of the side links 58, first link 62, and second link 63, thereby extending their service life. The force-bearing structures of the seat back 20 , the side connecting rod 58 , the first connecting rod 62 , and the second connecting rod 63 are rationally distributed to reduce after-sales maintenance costs.

[0059] In one embodiment, the armrest stop block 25, the armrest transmission block 64, and the status stop block 41 are each arc-shaped. The armrest stop block 25, the armrest transmission block 64, and the status stop block 41 are coaxially arranged. The first armrest stop surface 26, the first armrest transmission surface 65, and the first status stop surface 42 extend radially. The armrest stop block 25, the armrest transmission block 64, and the status stop block 41 rotate relative to each other. The coaxial arrangement of the armrest stop block 25, the armrest transmission block 64, and the status stop block 41 allows for smoother rotation of the armrest 40, the second connecting rod 63, and the chair back 20.

[0060] Furthermore, as shown in Figures 9 and 10, the other end of the armrest stop block 25 is provided with a second armrest stop surface 27, the other end of the armrest transmission block 64 is provided with a second armrest transmission surface 66, and the other end of the state stop block 41 is provided with a second state stop surface 43. When the armrest 40 is in the use state and flipped up, the second state stop surface 43 abuts the second armrest stop surface 27, with a gap between the second state stop surface 43 and the second armrest transmission surface 66. When the armrest 40 is in the folded state, the second state stop surface 43 abuts the second armrest stop surface 27. When the armrest 40 extends horizontally in the use state and flips up, the first state stop surface 42 rotates away from the first armrest stop surface 26, i.e., the armrest 40 rotates counterclockwise. When the armrest 40 rotates to a substantially vertical position, it is stopped by the second armrest stop surface 27, keeping the armrest 40 substantially vertical, avoiding lateral movement space, and facilitating users getting on and off the chair from the side. At this time, there is a gap between the second armrest transmission surface 66 and the second state limit surface 43, that is, when the armrest 40 is in use, whether it is flipped up or extended horizontally, the second connecting rod 63 is not subjected to the force in the circumferential direction, thereby avoiding the breakage of the second connecting rod 63 and reducing after-sales maintenance costs.

[0061] It should be noted that the wheelchair has both an in-use state and a folded state. In the in-use state, the backrest 20 and seat cushion 10 are perpendicular or substantially perpendicular to each other, allowing the user to sit on the seat cushion 10 and lean against the backrest 20. At this point, the armrests 40 are in the in-use state and extend horizontally, allowing the user's arms to rest on the armrests, reducing the burden on the arms, helping to rest the upper limb muscles, and increasing user comfort. When the user needs to get in or out of the wheelchair from the side of the seat cushion 10, the armrests 40 are rotated counterclockwise and flipped upward, placing them in a vertical or substantially vertical state. This creates a side passageway on the side of the seat cushion 10, allowing the user to maneuver through the space beside the seat cushion 10 and improving safety. When the wheelchair transitions from the in-use state to the folded state, the backrest 20 rotates downward and toward the seat cushion 10, and the armrests 40 enter the folded state. The second connecting rod 63 drives the armrests 40 upward, causing the backrest 20 to rotate downward and the armrests 40 to rotate upward, maintaining the same angle relative to the horizontal as in the in-use state, thus improving user safety.

[0062] Furthermore, as shown in Figures 11 to 13, when the armrest 40 is in the folded state, the second state limiting surface 43 abuts the second armrest limiting surface 27. When the armrest 40 is in the folded state, the first state limiting surface 42 is limited in the clockwise direction by the first armrest transmission surface 65, and the second state limiting surface 43 is limited in the counterclockwise direction by the second armrest limiting surface 27. As a result, the armrest 40 is locked after folding, and the armrest 40 remains in a substantially horizontal direction. The height dimensions of the seat cushion 10 and the chair back 20 after folding remain at a preset size for easy storage, while also improving storage safety.

[0063] Furthermore, as shown in Figures 5 to 13 , a connecting post 24 is formed by a protrusion on the side of the seat back 20. A mounting ring 67 is formed on the first end of the second connecting rod 63 along the axis of the connecting post 24. A connecting hole 44 is defined at the rear end of the armrest 40. The mounting ring 67 is sleeved onto the outer circumference of the connecting post 24. The connecting post 24 is mounted in the connecting hole 44. The connecting post 24, the mounting ring 67, and the connecting hole 44 are coaxially arranged. A retaining ring 33 is provided at the end of the connecting post 24. The inner end surface of the retaining ring 33 abuts the armrest 40 in the axial direction. The mounting ring 67 of the second connecting rod 63 is mounted on the connecting post 24, allowing the first end of the second connecting rod 63 and the connecting post 24 to rotate relative to each other. The connecting post 24 is mounted in the connecting hole 44 of the armrest 40, allowing the armrest 40 to rotate relative to the connecting post 24. The retaining ring 33 axially limits the connecting hole 44 and the mounting ring 67, preventing the second connecting rod 63 and the armrest 40 from falling out of the axial direction.

[0064] As one embodiment, as shown in Figures 5 to 13 , one radial end of the handrail transmission block 64 is connected to the outer circumferential surface of the mounting ring 67, and the other radial end of the handrail transmission block 64 is disposed toward the inner annular surface of the handrail stop block 25. The state stop block 41 is disposed around the edge of the connection hole 44. The first state stop surface 42 extends radially to the first handrail stop surface 26 and the first handrail transmission surface 65, respectively. The second state stop surface 43 extends radially to the second handrail stop surface 27 and the second handrail transmission surface 66, respectively. When the handrail 40 extends horizontally in the use state, the first handrail stop surface 26 and the first handrail transmission surface 65 are respectively disposed opposite the first state stop surface 42, and a gap is circumferentially defined between the first handrail transmission block 64 and the first handrail stop surface 26 and the first state stop surface 42, respectively. When the armrest 40 extends in the vertical direction in use, the second armrest limiting surface 27 and the second armrest transmission surface 66 are respectively arranged opposite to the second state limiting surface 43, and the second armrest transmission block 64 has a gap with the second armrest limiting surface 27 and the second state limiting surface 43 along the circumferential direction.

[0065] In summary, the present invention provides a wheelchair with a backrest 20 located behind a seat cushion 10 and armrests 40 located on both sides of the seat cushion 10. When a user uses the wheelchair, the user sits on the seat cushion 10, leans against the backrest 20, and places their hands on the armrests 40. The seat cushion 10, backrest 20, and armrests 40 are folded by a folding bracket 50, thereby reducing the space occupied by the wheelchair and facilitating storage. Specifically, the folding bracket 50 includes a mounting bracket 51, a first connecting rod 62 and a second connecting rod 63. The mounting bracket 51 of the folding bracket 50 is connected to the rear end of the seat cushion 10. The second end of the mounting bracket 51 is provided with a first connecting portion 61 and a second connecting portion 53. The first end of the first connecting rod 62 is rotatably connected to the first connecting portion 61, and the second end of the first connecting rod 62 is rotatably connected to the second end of the second connecting rod 63. The first end of the second connecting rod 63 is rotatably connected to one side of the seat back 20 and the armrest 40 respectively. When the wheelchair is in use, the mounting bracket 51 is located at the rear end of the seat cushion 10, the first connecting rod 62 extends upward based on the second end of the mounting bracket 51, and the second connecting rod 63 extends forward relative to the first connecting rod 62 to one side of the seat back 20. Therefore, the folding bracket 50 is located at the rear end of the seat, and the armrest 40, the mounting bracket 51 and the seat cushion 10 form a side activity channel on the side of the wheelchair. The folding bracket 50 does not occupy the side space of the wheelchair, reduces interference with the activity space on the side of the wheelchair, and provides a larger activity space for the side activity channel, thereby improving the safety of the user getting on and off the wheelchair from the side. When folding, the mounting bracket 51 is fixed to the rear end of the seat cushion 10, the seat back 20 is rotatably connected to the second connecting portion 53 on the mounting bracket 51, and the first ends of the second connecting rods 63 are rotatably connected to the seat back 20 and the armrest 40 respectively. The seat back 20 rotates forward, and the first end of the second connecting rod 63 moves forward through the seat back 20. Since the second end of the second connecting rod 63 is rotatably connected to the first connecting portion 61 of the mounting bracket 51 through the first connecting rod 62, and then, the second end of the second connecting rod 63 rotates backward, the first end of the second connecting rod 63 drives the armrest 40 to rotate synchronously from bottom to top, as shown in Figures 2 and 13, the seat back 20 is in the folded state and in use. In the in-use state, the first axis, the second axis, the third axis and the fourth axis all extend in the width direction and are arranged in parallel. The first axis, the second axis, the third axis and the fourth axis are respectively projected onto the projection surface in the width direction to form a first projection point, a second projection point, a third projection point and a fourth projection point. The first projection point, the second projection point, the third projection point and the fourth projection point are sequentially connected on the projection surface to form a quadrilateral, so that the angle of the armrest 40 can remain basically unchanged when the chair back 20 is in the in-use state and the folded state, thereby preventing the armrest 40 from rotating and colliding with the ground after folding, causing damage, or causing danger of use, thereby improving safety of use.

[0066] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A wheelchair, characterized in that: Includes seat cushion, backrest, armrests and folding stand; The folding bracket comprises a mounting bracket, a first connecting rod and a second connecting rod, the first end of the mounting bracket is connected to the seat cushion, the second end of the mounting bracket is provided with a first connecting portion and a second connecting portion, the first end of the first connecting rod is rotatably connected to the first connecting portion to form a first axis, the second end of the first connecting rod is rotatably connected to the second end of the second connecting rod to form a second axis, the seat back and the armrest are both rotatably connected to the first end of the second connecting rod to form a third axis, and the seat back is rotatably connected to the second connecting portion to form a fourth axis; Among them, the first axis, the second axis, the third axis and the fourth axis all extend along the width direction and are arranged in parallel, and the first axis, the second axis, the third axis and the fourth axis are respectively projected onto the projection plane along the width direction to form a first projection point, a second projection point, a third projection point and a fourth projection point, and the first projection point, the second projection point, the third projection point and the fourth projection point are sequentially connected on the projection plane to form a quadrilateral.

2. The wheelchair according to claim 1, characterized in that: The mounting bracket includes a bottom link and a side link, the first end of the bottom link is fixedly connected to the seat cushion, the first end of the side link is fixed to the outer side surface of the bottom link in the width direction, the first connecting portion is arranged at the second end of the side link, and the second connecting portion is arranged at the second end of the bottom link.

3. The wheelchair according to claim 2, characterized in that: The side link includes a fixing portion and an extending portion, wherein the fixing portion is fixedly connected to the second end of the bottom link, the first end of the extending portion is connected to the fixing portion, the second end of the extending portion is tilted backward, and the first connecting portion is arranged on the extending portion.

4. The wheelchair according to claim 2, characterized in that: The chair back comprises a backrest plate and a chair back bracket, the back side of the backrest plate is connected to the chair back bracket, the first end of the chair back bracket is provided with a folding connection part and a first matching part, the bottom connecting rod is provided with a second matching part, the folding connection part is rotatably connected to the second connection part, and the first matching part is detachably connected to the second matching part.

5. The wheelchair according to claim 4, characterized in that: The first matching portion is located behind the folding connection portion, and the second matching portion is located behind the second connection portion.

6. The wheelchair according to claim 4, characterized in that: The first matching portion is snap-fitted with the second matching portion.

7. The wheelchair according to claim 4, characterized in that: The second end of the bottom connecting rod extends backward and protrudes to form the second matching portion, the second matching portion includes a lower boss, and the side of the lower boss facing away from the seat cushion forms an upper limit surface. The first end of the seat back bracket extends forward to form the folding connection portion, and the first matching portion includes a buckle and a lower limit surface, a slot is formed between the buckle and the lower limit surface, the lower boss can be embedded in the slot, and the upper limit surface abuts against the lower limit surface.

8. The wheelchair according to claim 4, characterized in that: The second end of the bottom link is connected to forwardly extending transfer arms on both sides in the width direction, respectively. The transfer arms are the second connection parts, and the folding connection part is rotatably connected between the two transfer arms.

9. The wheelchair according to claim 4, characterized in that: The chair back support includes a supporting beam and a supporting arm, the second end of the supporting arm is connected to the bottom of the supporting beam, the folding connection portion and the first matching portion are arranged at the first end of the supporting arm, the back surface of the backrest plate is connected to the supporting beam, and the first end of the second connecting rod and the armrest are rotatably connected to the end of the supporting beam in the width direction.

10. The wheelchair according to claim 1, characterized in that: The rear ends of the second connecting rod and the armrest are coaxially rotatably connected to one side of the chair back in the width direction, and the chair back is provided with an armrest limit block on one side in the width direction, and one end of the armrest limit block is provided with a first armrest limit surface, the second connecting rod is provided with an armrest transmission block, and one end of the armrest transmission block is provided with a first armrest transmission surface, the armrest is provided with a state limit block, and one end of the state limit block is provided with a first state limit surface, the armrest includes a use state and a folded state, when the armrest is in the use state, the first armrest limit surface abuts against the first state limit surface, and there is a gap between the first armrest transmission surface and the first state limit surface, when the armrest is in the folded state, the first armrest transmission surface abuts against the first state limit surface, and the first armrest limit surface is separated from the first state limit surface.

11. The wheelchair according to claim 10, characterized in that: The other end of the armrest limiting block is provided with a second armrest limiting surface, the other end of the armrest transmission block is provided with a second armrest transmission surface, and the other end of the state limiting block is provided with a second state limiting surface. When the armrest is flipped up in the use state, the second state limiting surface abuts against the second armrest limiting surface, and there is a gap between the second state limiting surface and the second armrest transmission surface. When the armrest is in the folded state, the second state limiting surface abuts against the second armrest limiting surface.

12. The wheelchair according to claim 11, characterized in that: When the armrest is in the folded state, the second state limiting surface abuts against the second armrest limiting surface.

13. The wheelchair according to claim 10, characterized in that: The side of the chair back protrudes to form a connecting column, the first end of the second connecting rod protrudes along the axial direction of the connecting column to form a mounting ring, the rear end of the armrest is provided with a connecting hole, the mounting ring is sleeved on the outer circumferential surface of the connecting column, the connecting column is installed in the connecting hole, the connecting column, the mounting ring and the connecting hole are coaxially arranged, and a limiting ring is provided at the end of the connecting column, and the inner end surface of the limiting ring in the axial direction abuts against the armrest.

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