A wheelchair

Abstract

The application relates to the technical field of travelling tools and discloses a wheelchair which comprises a seat cushion, a chair back, an armrest, a mounting support, a first connecting rod and a second connecting rod, the first end of the mounting support is connected to the rear end of the seat cushion, the second end of the mounting support is provided with a first connecting part and a second connecting part, the first end of the first connecting rod is rotationally connected with the first connecting part to form a first axis, the second end of the first connecting rod is rotationally connected with the second end of the second connecting rod to form a second axis, the first end of the second connecting rod is rotationally connected with one side of the chair back and the armrest to form a third axis, the first end of the chair back is rotationally connected with the second connecting part to form a fourth axis, the first axis, the second axis, the third axis and the fourth axis all extend along the width direction and are arranged in parallel, form four projection points on a projection plane, and sequentially connect the four projection points on the projection plane to form a quadrangle. The wheelchair of the application avoids downward rotation of the armrest when the armrest is folded, and meets the requirement of users to get on and off the wheelchair on the side of the seat.

Description

Technical Field

[0001] This invention relates to the technical field of transportation tools, and in particular to a wheelchair. Background Technology

[0002] Currently, wheelchairs are assistive walking vehicles, especially suitable for the elderly with mobility difficulties or people with leg injuries who have difficulty walking. To facilitate storage, the backrest, armrests, and seat cushion are folded together using a rotating folding structure. However, the armrests are located on the left and right sides of the seat cushion. This folding structure connecting the seat cushion and armrests makes it impossible for users to easily get in and out of the wheelchair from the side. Furthermore, during folding, the front of the armrests tends to rotate downwards, potentially causing damage upon impact with the ground or posing a safety hazard if it collides with the person storing the wheelchair. Summary of the Invention

[0003] The purpose of this invention is to provide a wheelchair that prevents the armrests from rotating downwards during folding, thereby improving safety and meeting the user's need to get in and out of the wheelchair from the side of the seat.

[0004] To achieve the above objectives, the present invention provides a wheelchair, including a seat cushion, a backrest, armrests, and a folding frame;

[0005] 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, and the second end of the mounting bracket is provided with a first connecting part and a second connecting part. The first end of the first connecting rod is rotatably connected to the first connecting part to form a first axis, and the second end of the first connecting rod is rotatably connected to the second end of the second connecting part to form a second axis. The backrest and the armrest are both rotatably connected to the first end of the second connecting rod to form a third axis, and the backrest is rotatably connected to the second connecting part to form a fourth axis.

[0006] The first axis, the second axis, the third axis, and the fourth axis all extend along 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 connected sequentially on the projection surface to form a quadrilateral.

[0007] As a preferred embodiment, the mounting bracket includes a bottom connecting rod and a side connecting rod. The first end of the bottom connecting rod is fixedly connected to the rear end of the seat cushion, and the first end of the side connecting rod is fixed to the outer side of the bottom connecting rod in the width direction. The first connecting part is disposed at the second end of the side connecting rod, and the second connecting part is disposed at the second end of the bottom connecting rod.

[0008] As a preferred embodiment, the side connecting rod includes a fixed part and an extension part. The fixed part is fixedly connected to the second end of the bottom connecting rod, the first end of the extension part is connected to the fixed part, the second end of the extension part is tilted backward, and the first connecting part is disposed on the extension part.

[0009] As a preferred embodiment, the chair back includes a backrest panel and a chair back support. The back of the backrest panel is connected to the chair back support. The first end of the chair back support is provided with a folding connecting part and a first mating part. The bottom connecting rod is provided with a second mating part. The folding connecting part is rotatably connected to the second connecting part. The first mating part and the second mating part are detachably connected.

[0010] As a preferred embodiment, the first mating part is located behind the folded connecting part, and the second mating part is located behind the second connecting part.

[0011] As a preferred embodiment, the first mating part and the second mating part are engaged in a snap-fit ​​connection.

[0012] As a preferred embodiment, the second end of the bottom connecting rod extends rearward to form the second mating part, the second mating part includes a lower boss, the side of the lower boss facing away from the seat cushion forms an upper limit surface, the first end of the backrest bracket extends forward to form the folding connecting part, the first mating part includes a buckle and a lower limit surface, a groove is formed between the buckle and the lower limit surface, the lower boss can be inserted into the groove, and the upper limit surface abuts against the lower limit surface.

[0013] As a preferred embodiment, the second end of the bottom connecting rod is connected to forward-extending adapter arms on both sides in the width direction, the adapter arms being the second connecting part, and the folding connecting part being rotatably connected between the two adapter arms.

[0014] As a preferred embodiment, the chair back support includes a support beam and a support arm. The second end of the support arm is connected to the bottom of the support beam. The folding connection and the first mating part are disposed at the first end of the support arm. The back of the backrest is connected to the support beam. The first end of the second connecting rod and the armrest are rotatably connected to the end of the support beam in the width direction.

[0015] As a preferred embodiment, the second connecting rod and the rear end of the armrest are coaxially rotatably connected to one side of the chair back in the width direction. The chair back is provided with an armrest limiting block on one side in the width direction, and one end of the armrest limiting block is provided with a first armrest limiting 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 limiting block, and one end of the state limiting block is provided with a first state limiting surface. The armrest includes a used state and a folded state. When the armrest is in the used state, the first armrest limiting surface abuts against the first state limiting surface, and there is a gap between the first armrest transmission surface and the first state limiting surface. When the armrest is in the folded state, the first armrest transmission surface abuts against the first state limiting surface, and the first armrest limiting surface separates from the first state limiting surface.

[0016] As a preferred embodiment, the other end of the handrail limiting block is provided with a second handrail limiting surface, the other end of the handrail transmission block is provided with a second handrail transmission surface, and the other end of the state limiting block is provided with a second state limiting surface. When the handrail is in the use state and flipped up, the second state limiting surface abuts against the second handrail limiting surface, and there is a gap between the second state limiting surface and the second handrail transmission surface. When the handrail is in the folded state, the second state limiting surface abuts against the second handrail limiting surface.

[0017] As a preferred embodiment, when the handrail is in a folded state, the second state limiting surface abuts against the second handrail limiting surface.

[0018] As a preferred embodiment, the side of the chair back protrudes to form a connecting post, the first end of the second connecting rod protrudes along the axial direction of the connecting post to form a mounting ring, the rear end of the armrest is provided with a connecting hole, the mounting ring is fitted onto the outer circumferential surface of the connecting post, the connecting post is installed in the connecting hole, the connecting post, the mounting ring and the connecting hole are coaxially arranged, the end of the connecting post is provided with a limiting ring, and the inner end face of the limiting ring in the axial direction abuts against the armrest.

[0019] Compared with the prior art, the wheelchair of this invention has the following advantages: In the wheelchair of this invention, 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 using a folding bracket to reduce the space occupied by the wheelchair and facilitate storage. Specifically, the folding support includes a mounting bracket, a first link, and a second link. The mounting bracket is connected to the rear end of the seat cushion. The second end of the mounting bracket has a first connecting part and a second connecting part. The first end of the first link is rotatably connected to the first connecting part, and the second end of the first link is rotatably connected to the second end of the second link. The first end of the second link is rotatably connected to one side of the backrest and the armrest. When the wheelchair is in use, the mounting bracket is located at the rear end of the seat cushion. The first link extends upward from the second end of the mounting bracket, and the second link extends forward relative to the first link to one side of the backrest. Therefore, the folding support is located at the rear end of the seat. The armrest, the mounting bracket, and the seat form a side movement channel on the side of the wheelchair. The folding support does not occupy the side space of the seat, reducing interference with the side movement space of the wheelchair and allowing for a larger movement channel, thus improving the safety of the user when getting on and off the wheelchair from the side. When folded, the mounting bracket is fixed to the rear end of the seat cushion, and the backrest is rotatably connected to the second connecting part on the mounting bracket. The first end of the second connecting rod is rotatably connected to both the backrest and the armrest. When the backrest rotates forward, it drives the first end of the second connecting rod to move forward. Since the second end of the second connecting rod is rotatably connected to the first connecting part of the mounting bracket through the first connecting rod, the second end of the second connecting rod rotates backward. The first end of the second connecting rod drives the armrest to rotate synchronously from bottom to top. In both the folded and used states, the first, second, third, and fourth axes of the backrest extend along the width direction and are arranged in parallel. The first, second, third, and fourth axes are projected onto the projection surface along the width direction to form the first projection point, the second projection point, the third projection point, and the fourth projection point, respectively. The first, second, third, and fourth projection points are sequentially connected on the projection surface to form a quadrilateral, ensuring that the armrests maintain a basically unchanged angle in both the used and folded states. This prevents the armrests from rotating and colliding with the ground after folding, thus avoiding damage or potential danger and improving safety. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention.

[0021] Figure 2 This is a schematic diagram of the backrest and seat cushion in use according to an embodiment of the present invention.

[0022] Figure 3 This is a schematic diagram of the structure of the folding bracket according to an embodiment of the present invention.

[0023] Figure 4 This is a schematic diagram of the mounting bracket according to an embodiment of the present invention.

[0024] Figure 5 This is a schematic diagram of the chair back structure according to an embodiment of the present invention.

[0025] Figure 6 This is a schematic diagram of the handrail structure according to an embodiment of the present invention.

[0026] Figure 7 This is a schematic diagram of the structure of the second connecting rod in an embodiment of the present invention.

[0027] Figure 8 This is an embodiment of the present invention. Figure 1 Enlarged structural cross-sectional view at point A in the diagram.

[0028] Figure 9 This is a schematic diagram of the structure of the handrail extending vertically in the usage state of an embodiment of the present invention.

[0029] Figure 10 This is an embodiment of the present invention. Figure 9 Enlarged structural cross-sectional view at point B in the diagram.

[0030] Figure 11 This is a schematic diagram of the folded state of an embodiment of the present invention.

[0031] Figure 12 This is an embodiment of the present invention. Figure 11 Enlarged cross-sectional view of the structure at point C.

[0032] Figure 13 This is a schematic diagram of the structure of the chair back and seat cushion in a folded state according to an embodiment of the present invention.

[0033] In the picture:

[0034] 10. Seat cushion;

[0035] 20. Chair back; 21. Backrest panel; 22. Chair back support; 23. Support beam; 24. Connecting column; 25. Armrest limiting block; 26. First armrest limiting surface; 27. Second armrest limiting surface; 28. Support arm; 29. ​​Folding connection part; 30. First mating part; 31. Buckle; 32. Lower limiting surface; 33. Limiting ring;

[0036] 40. Handrail; 41. Status limiting block; 42. First status limiting surface; 43. Second status limiting surface; 44. Connecting hole;

[0037] 50. Folding bracket; 51. Mounting bracket; 52. Bottom connecting rod; 53. Second connecting part; 54. Adapter arm; 55. Second mating part; 56. Upper limit surface; 57. Lower boss; 58. Side connecting rod; 59. Fixing part; 60. Extension part; 61. First connecting part; 62. First connecting rod; 63. Second connecting rod; 64. Handrail transmission block; 65. First handrail transmission surface; 66. Second handrail transmission surface; 67. Mounting ring. Detailed Implementation

[0038] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0039] In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0040] In the description of this invention, it should be understood that the terms "connected," "linked," and "fixed," etc., used in this invention should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or a welded connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly defined. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0041] like Figures 1 to 12As shown, a preferred embodiment of the wheelchair of the present invention includes a seat cushion 10, a backrest 20, armrests 40, and a folding frame 50. The folding frame 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 63. 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 chair back 20 is rotatably connected to one side of the chair back 20 and the armrest 40 to form a third axis. The first end of the chair back 20 is rotatably connected to the second connecting part 53 to form a fourth axis. The first axis, the second axis, the third axis and the fourth axis all extend along 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 sequentially on the projection surface to form a quadrilateral.

[0042] It should be noted that the first end is the end of the chair back 20 when it is in use, with the component close to the ground, and the second end is the end of the chair back 20 when it is in use, with the component away from the ground.

[0043] 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 his / her hands on the armrests 40. The seat cushion 10, the backrest 20, and the armrests 40 are folded by a folding bracket 50 to reduce the space occupied by the wheelchair and facilitate storage. Specifically, the folding support 50 includes a mounting bracket 51, a first connecting rod 62, and a second connecting rod 63. The mounting bracket 51 of the folding support 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 part 61 and a second connecting part 53. The first end of the first connecting rod 62 is rotatably connected to the first connecting part 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 backrest 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 from 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 backrest 20. Therefore, the folding support 50 is located at the rear end of the seat cushion 10. The armrest 40, the mounting bracket 51, and the seat form a side movement channel on the side of the wheelchair. The folding support 50 does not occupy the side space of the wheelchair, reduces interference with the side movement space of the wheelchair, and makes the side movement channel have a larger movement space, improving the safety of the user getting on and off the wheelchair from the side. When folded, the mounting bracket 51 is fixed to the rear end of the seat cushion 10, and the backrest 20 is rotatably connected to the second connecting part 53 on the mounting bracket 51. The first end of the second connecting rod 63 is rotatably connected to the backrest 20 and the armrest 40 respectively. When the backrest 20 rotates forward, it drives the first end of the second connecting rod 63 to move forward. Since the second end of the second connecting rod 63 is rotatably connected to the first connecting part 61 of the mounting bracket 51 through the first connecting rod 62, 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. The backrest 20 is in both the folded and used states. The first, second, third, and fourth axes all extend along the width direction and are arranged in parallel. The first, second, third, and fourth axes are projected onto the projection surface along the width direction to form the first projection point, the second projection point, the third projection point, and the fourth projection point, respectively. The first, second, third, and fourth projection points are connected sequentially on the projection surface to form a quadrilateral. This ensures that the armrest 40 maintains a basically unchanged angle when the backrest 20 is in use or folded, preventing the armrest 40 from rotating and colliding with the ground after folding, thus avoiding damage or potential danger and improving safety.

[0044] In 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 sequentially on the projection surface to form a parallelogram. When the backrest 20 is folded or opened relative to the seat cushion 10, the operation is more stable and smooth, and the safety of use is high.

[0045] Furthermore, such as Figure 4 As shown, the mounting bracket 51 includes a bottom connecting rod 52 and a side connecting rod 58. The first end of the bottom connecting rod 52 is fixedly connected to the rear end of the seat cushion 10. The first end of the side connecting rod 58 is fixed to the outer side of the bottom connecting rod 52 in the width direction. A first connecting part 61 is disposed at the second end of the side connecting rod 58, and a second connecting part 53 is disposed at the second end of the bottom connecting rod 52. The side connecting rod 58 is connected to the outer side of the bottom connecting rod 52 in the width direction. The first connecting part 61 is disposed at the second end of the side connecting rod 58. A first connecting rod 62 is connected to the first connecting part 61. The armrest 40 is rotatably connected to the first connecting rod 62 through the second connecting rod 63, so that the armrest 40 maintains a constant angle. The second connecting part 53 is disposed at the second end of the bottom connecting rod 52. The first end of the backrest 20 is connected to the second connecting part 53, so that the backrest 20 is folded. This ensures that the structures that enable the backrest 20 to fold and the armrest 40 to maintain a constant angle are staggered in the width direction, avoiding interference during rotation and making the folding process of the backrest 20 smoother.

[0046] Furthermore, such as Figures 3 to 4 As shown, the side link 58 includes a fixing part 59 and an extension part 60. The fixing part 59 is fixedly connected to the second end of the bottom link 52. The first end of the extension part 60 is connected to the fixing part 59. The second end of the extension part 60 is tilted backward. The first connecting part 61 is disposed on the extension part 60. The first end of the side link 58 is fixedly connected to the second end of the bottom link 52 through the fixing part 59. The second end of the side link 58 is tilted backward. The line connecting the first axis and the fourth axis on the projection plane extending in the front-rear direction is tilted backward. At the same time, the line connecting the second axis and the third axis on the projection plane extending in the front-rear direction is also tilted backward. The extension part 60 and the second link 63 are both tilted backward to avoid occupying the side space of the seat cushion 10 and to reserve more movement space for the side of the seat cushion 10.

[0047] Furthermore, such as Figure 5As shown, the chair back 20 includes a backrest panel 21 and a chair back support 22. The back of the backrest panel 21 is connected to the chair back support 22. The first end of the chair back support 22 is provided with a folding connecting part 29 and a first mating part 30. The second end of the bottom connecting rod 52 is provided with a second mating part 55. The folding connecting part 29 and the second connecting part 53 are rotatably connected, and the first mating part 30 and the second mating part 55 are detachably connected. When the user sits in the wheelchair, they lean against the backrest panel 21. The back of the backrest panel 21 is connected to the chair back support 22, which provides support for the backrest panel 21. The chair back support 22 is a frame structure, which can meet the support strength requirements while reducing the overall weight of the wheelchair, saving materials, and reducing production costs. The bottom connecting rod 52 is fixed to the seat cushion 10. The chair back support 22 is rotatably connected to the second connecting part 53 of the bottom connecting rod 52 through the folding connecting part 29, so that the chair back support 22 can rotate relative to the seat cushion 10 to achieve folding. The chair back support 22 is provided with a first mating part 30, and the bottom connecting rod 52 is provided with a second mating part 55. The first mating part 30 and the second mating part 55 are detachably connected. When the chair back support 22 is rotated to the use state, the first mating part 30 and the second mating part 55 are connected to fix the chair back 20 and the bottom connecting rod 52, preventing the chair back 20 from being accidentally folded and thus causing a danger in use, thereby improving the safety of use.

[0048] Furthermore, such as Figures 1 to 5 As shown, the first mating part 30 is located behind the folding connecting part 29, and the second mating part 55 is located behind the second connecting part 53. The folding connecting part 29 and the second connecting part 53 are rotatably connected. The first mating part 30 and the second mating part 55 are located behind the folding connecting part 29 and the second connecting part 53 after rotation, away from the seat cushion 10, to avoid the chair back 20 from being accidentally folded and thus causing a danger in use, and to improve the safety of use.

[0049] Furthermore, such as Figures 1 to 5 As shown, the first mating part 30 and the second mating part 55 engage in a snap-fit ​​connection. This snap-fit ​​method is simple and easy to operate, while also being highly efficient, improving the user experience when switching between the wheelchair's folded and usable states.

[0050] Furthermore, such as Figures 1 to 5As shown, the second end of the bottom connecting rod 52 extends rearward to form a second mating part 55. The second mating part 55 includes a lower boss 57. The side of the lower boss 57 facing away from the seat cushion 10 forms an upper limit surface 56. The first end of the backrest bracket 22 extends forward to form a folding connecting part 29. The first mating part 30 includes a buckle 31 and a lower limit surface 32. A groove is formed between the buckle 31 and the lower limit surface 32. The lower boss 57 can be inserted into the groove. The upper limit surface 56 abuts against the lower limit surface 32. The upper limit surface 56 of the bottom connecting rod 52 faces upward, and the lower limit surface 32 of the backrest 20 faces downward. The upper limit surface 56 and the lower limit surface 32 abut against each other to limit the backrest support 22, preventing the backrest support 22 from rotating excessively backward. This keeps the backrest panel 21 at a set angle during use. At the same time, the force of the backrest support 22 acts on the upper limit surface 56. The backrest support 22 is supported only by the bottom connecting rod 52, while the side connecting rod 58, the first connecting rod 62 and the second connecting rod 63 are not under stress. The side connecting rod 58, the first connecting rod 62 and the second connecting rod 63 are not easy to break, thus extending their service life.

[0051] Furthermore, such as Figures 1 to 5 As shown, the second end of the bottom connecting rod 52 is connected to forward-extending adapter arms 54 on both sides in the width direction. The adapter arms 54 are the second connecting parts 53. The folding connecting part 29 is rotatably connected between the two adapter arms 54. The adapter arms 54 on both sides of the folding connecting part 29 limit the movement in the width direction, while the two adapter arms 54 provide installation space for the folding rotating part.

[0052] In one embodiment, the front end of the lower limiting surface 32 is connected to the rear end of the adapter arm 54, and the front end of the upper limiting surface 56 is connected to the folding connecting part 29. In use, the buckle 31 is engaged with the lower boss 57, and the upper limiting surface 56 abuts against the lower limiting surface 32, providing support for the lower limiting surface 32. The side connecting rod 58, the first connecting rod 62, and the second connecting rod 63 are in a stress-free state, making them less prone to breakage and extending their service life. The buckle 31 and the lower boss 57 are located behind the adapter arm 54 and the folding connecting part 29, respectively, away from the user, avoiding misoperation and improving safety. Meanwhile, the lower limit surface 32 and the upper limit surface 56 serve as a support and limit structure, simplifying the structural design of the support and limit structure. The folding connecting part 29 and the adapter arm 54 form a rotating structure through a pivot 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 a folding structure. The short distance between the support and limit structure and the rotating structure contributes to the miniaturization of the folding structure. When converting the seat from the use state to the folding state, it is only necessary to open the connection between the buckle 31 and the lower boss 57, push the backrest 21 forward, separate the upper limit surface 56 and the lower limit surface 32, and allow the folding connecting part 29 to rotate around the front end of the adapter arm 54 to achieve the folding of the seat.

[0053] Furthermore, such as Figure 5As shown, the chair back support 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. A folding connection part 29 and a first mating part 30 are disposed at the first end of the support arm 28. The back of the backrest 21 is connected to the support beam 23. 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 approximately along the width direction, and the support arm 28 extends approximately along the vertical direction. The back of the backrest panel 21 is connected to the support beam 23. When in use, the user leans against the backrest panel 21, and the force in the backrest panel 21 is transmitted to the support arm 28 through the support beam 23. The folding connection part 29 and the first mating part 30 are provided at the first end of the support arm 28, and the force is transmitted to the bottom connecting rod 52 through the support arm 28. The bottom connecting rod 52 bears the force of the chair back support 22, reducing the number of force transmission parts and force-bearing parts. The support structure is simple, which helps to reduce costs and after-sales maintenance costs while improving safety. Meanwhile, the first end of the second link 63 and the handrail 40 are rotatably connected to the end of the support beam 23 in the width direction. When folded, the support 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 handrail 40 to rotate upward at the same time as the beam rotates downward, so that the angle of the handrail 40 can remain basically unchanged during use and after folding. The handrail 40 and the second link 63 are connected to the support beam 23, which is convenient for after-sales maintenance and replacement.

[0054] In one embodiment, the first connecting rod 62 has a first groove on the side facing the supporting beam 23, and the supporting beam 23 is installed in the first groove. The first connecting rod 62 is located on the inner side of the backrest 20 in the width direction, which helps to make the wheelchair smaller, while reducing interference during use and improving safety.

[0055] In one embodiment, the support beam 23 and the support arm 28 are integrally formed. The support beam 23 and the support arm 28 serve as the support and force transmission components for the backrest panel 21, as well as the force transmission components for the second link 63 and the armrest 40. The integrally formed structure of the support beam 23 and the support arm 28 helps to improve the structural stability of the chair back support 22, and also helps to improve the efficiency of after-sales replacement and maintenance as well as production assembly efficiency.

[0056] 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 the corresponding positions of the seat cushion 10, which can meet the support requirements and reduce production costs.

[0057] Furthermore, such as Figures 8 to 13As shown, the rear end of the second link 63 and the armrest 40 are coaxially rotatably connected to one side of the backrest 20 in the width direction. The backrest 20 is provided with an armrest limiting block 25 on one side in the width direction. One end of the armrest limiting block 25 is provided with a first armrest limiting surface 26. The second link 63 is provided with an armrest transmission block 64. 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 limiting block 41. One end of the state limiting block 41 is provided with a first state limiting surface 42. The armrest 40 includes a used state and a folded state. When the armrest 40 is in the used state, the first armrest limiting surface 26 abuts against the first state limiting surface 42, and there is a gap between the first armrest transmission surface 65 and the first state limiting surface 42. When the armrest 40 is in the folded state, the first armrest transmission surface 65 abuts against the first state limiting surface 42, and the first armrest limiting surface 26 is separated from the first state limiting surface 42. In use, the first handrail limiting surface 26 abuts against the first state limiting surface 42. The first handrail limiting surface 26 only needs to limit the first state limiting surface 42 to prevent the front end of the handrail 40 from rotating downward and keep the handrail 40 roughly horizontal. There is a gap between the first handrail transmission surface 65 and the first state limiting surface 42. The force exerted by the handrail 40 in use is only applied to the first handrail limiting surface 26, while the first handrail 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 against the first state limiting surface 42. The second link 63 and the rear end of the armrest 40 are rotatably connected to one side of the backrest 20. When the backrest 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 backrest 20. The first armrest transmission surface 65 abuts against the first state limiting surface 42. As the backrest 20 rotates downward, the first armrest transmission surface 65 drives the first state limiting surface 42 to rotate counterclockwise, causing the armrest 40 to rotate upward simultaneously with the downward rotation of the backrest 20, thus maintaining the armrest 40 in a roughly horizontal state. The side link 58, the first link 62, and the second link 63 are only subjected to force in the folded state and not in the use state, preventing them from breaking and extending their service life. By rationally distributing the stress structure of the chair back 20, side link 58, first link 62, and second link 63, after-sales maintenance costs are reduced.

[0058] In one embodiment, the armrest limiting block 25, the armrest transmission block 64, and the state limiting block 41 are all arc-shaped. The armrest limiting block 25, the armrest transmission block 64, and the state limiting block 41 are coaxially arranged. The first armrest limiting surface 26, the first armrest transmission surface 65, and the first state limiting surface 42 extend radially. The armrest limiting block 25, the armrest transmission block 64, and the state limiting block 41 can rotate relative to each other. The coaxial arrangement of the armrest limiting block 25, the armrest transmission block 64, and the state limiting block 41 makes the rotation of the armrest 40, the second connecting rod 63, and the chair back 20 smoother.

[0059] Furthermore, such as Figures 9 to 10 As shown, the other end of the armrest limiting block 25 is provided with a second armrest limiting 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 limiting block 41 is provided with a second state limiting surface 43. When the armrest 40 is in the use state and flipped up, the second state limiting surface 43 abuts against the second armrest limiting surface 27, and there is a gap between the second state limiting surface 43 and the second armrest transmission surface 66. When the armrest 40 is in the folded state, the second state limiting surface 43 abuts against the second armrest limiting surface 27. When the armrest 40 is in the use state and extends horizontally to flip up, the first state limiting surface 42 rotates away from the first armrest limiting surface 26, that is, the armrest 40 rotates counterclockwise. When the armrest 40 rotates to approximately vertical, it is limited by the second armrest limiting surface 27, keeping the armrest 40 approximately vertical and avoiding side movement space, making it convenient for users to get on and off the seat from the side. At this time, there is a gap between the second handrail transmission surface 66 and the second state limiting surface 43. That is, when the handrail 40 is in use, whether it is flipped up or extended horizontally, the second link 63 is not subjected to circumferential force, thus avoiding the second link 63 from breaking and reducing after-sales maintenance costs.

[0060] It should be noted that the wheelchair includes both a usable state and a folded state. In the usable state, the backrest 20 and seat cushion 10 are perpendicular or nearly perpendicular to each other. The user sits on the seat cushion 10 and can lean against the backrest 20. At this time, the armrests 40 are in use and extend horizontally. The user's arms are placed on the armrests, reducing the burden on the arms and helping the upper limb muscles to rest, increasing user comfort. When the user needs to get on or off the wheelchair from the side of the seat cushion 10, the armrests 40 are rotated counterclockwise and flipped upwards, making the armrests vertical or nearly vertical, forming a side movement channel on the side of the seat cushion 10. The user can move through the side space of the seat cushion 10, improving the safety of the user's movement on the side of the seat cushion 10. When the wheelchair changes from the usable state to the folded state, the backrest 20 rotates downwards and moves towards the seat cushion 10. The armrests 40 enter the folded state. The second linkage 63 drives the armrests 40 to rotate upwards, thereby causing the backrest 20 to rotate downwards and the armrests 40 to rotate upwards, while maintaining the same angle with the horizontal direction as in the usable state, improving the safety of use.

[0061] Furthermore, such as Figures 11 to 13 As shown, when the armrest 40 is in the folded state, the second state limiting surface 43 abuts against the second armrest limiting surface 27. When the armrest 40 is in the folded state, the first armrest transmission surface 65 limits the first state limiting surface 42 in the clockwise direction, and the second armrest limiting surface 27 limits the second state limiting surface 43 in the counterclockwise direction. Thus, the armrest 40 is locked after folding, and the armrest 40 remains in a roughly horizontal position. After the seat cushion 10 and the backrest 20 are folded, their height dimensions remain at a preset size for easy storage, while also improving storage safety.

[0062] Furthermore, such as Figures 5 to 13 As shown, a connecting post 24 protrudes from the side of the chair back 20. The first end of the second connecting rod 63 protrudes along the axial direction of the connecting post 24 to form a mounting ring 67. A connecting hole 44 is provided at the rear end of the armrest 40. The mounting ring 67 is fitted onto the outer circumferential surface of the connecting post 24. The connecting post 24 is installed in the connecting hole 44. The connecting post 24, the mounting ring 67, and the connecting hole 44 are coaxially arranged. A limiting ring 33 is provided at the end of the connecting post 24. The inner end face of the limiting ring 33 abuts against the armrest 40 in the axial direction. The mounting ring 67 of the second connecting rod 63 is installed on the connecting post 24, allowing the first end of the second connecting rod 63 to rotate relative to the connecting post 24. The connecting post 24 is installed in the connecting hole 44 of the armrest 40, allowing the armrest 40 to rotate relative to the connecting post 24. The limiting ring 33 limits the connecting hole 44 and the mounting ring 67 in the axial direction, preventing the second connecting rod 63 and the armrest 40 from falling off in the axial direction.

[0063] As one embodiment, such as Figures 5 to 13 As shown, one end of the handrail drive block 64 in the radial direction is connected to the outer peripheral surface of the mounting ring 67, and the other end of the handrail drive block 64 in the radial direction is disposed towards the inner ring surface of the handrail limiting block 25. The state limiting block 41 is disposed around the edge of the connecting hole 44. The first state limiting surface 42 extends radially to the first handrail limiting surface 26 and the first handrail drive surface 65, respectively. The second state limiting surface 43 extends radially to the second handrail limiting surface 27 and the second handrail drive surface 66, respectively. When the handrail 40 extends horizontally in the use state, the first handrail limiting surface 26 and the first handrail drive surface 65 are respectively disposed opposite to the first state limiting surface 42, and the first handrail drive block 64 has a gap circumferentially between itself and the first handrail limiting surface 26 and the first state limiting surface 42. When the handrail 40 extends vertically in the use state, the second handrail limiting surface 27 and the second handrail transmission surface 66 are respectively positioned opposite to the second state limiting surface 43, and the second handrail transmission block 64 has a gap between the second handrail limiting surface 27 and the second state limiting surface 43 in the circumferential direction.

[0064] In summary, this embodiment of the invention provides a wheelchair with a backrest 20 located behind the seat cushion 10 and armrests 40 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 their hands on the armrests 40. The seat cushion 10, backrest 20, and armrests 40 are folded together using a folding bracket 50 to reduce the space occupied by the wheelchair and facilitate storage. Specifically, the folding support 50 includes a mounting bracket 51, a first connecting rod 62, and a second connecting rod 63. The mounting bracket 51 of the folding support 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 part 61 and a second connecting part 53. The first end of the first connecting rod 62 is rotatably connected to the first connecting part 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 backrest 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 from 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 backrest 20. Therefore, the folding support 50 is located at the rear end of the seat. The armrest 40, the mounting bracket 51, and the seat cushion 10 form a side movement channel on the side of the wheelchair. The folding support 50 does not occupy the side space of the wheelchair, reduces interference with the side movement space of the wheelchair, and makes the side movement channel have a larger movement space, improving the safety of the user getting on and off the wheelchair from the side. When folded, the mounting bracket 51 is fixed to the rear end of the seat cushion 10, and the backrest 20 is rotatably connected to the second connecting part 53 on the mounting bracket 51. The first end of the second connecting rod 63 is rotatably connected to the backrest 20 and the armrest 40 respectively. When the backrest 20 rotates forward, it drives the first end of the second connecting rod 63 to move forward. Since the second end of the second connecting rod 63 is rotatably connected to the first connecting part 61 of the mounting bracket 51 through the first connecting rod 62, 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. Figure 2 and Figure 13 As shown, in both the folded and used states, the first, second, third, and fourth axes of the chair back 20 extend along the width direction and are arranged in parallel. The first, second, third, and fourth axes are projected onto the projection surface along the width direction to form the first projection point, the second projection point, the third projection point, and the fourth projection point, respectively. The first, second, third, and fourth projection points are connected sequentially on the projection surface to form a quadrilateral. This ensures that the armrests 40 maintain a basically unchanged angle in both the used and folded states, preventing the armrests 40 from rotating and colliding with the ground after folding, thus avoiding damage or potential danger and improving safety.

[0065] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make several improvements and substitutions without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A wheelchair, characterized in that: Includes seat cushion, backrest, armrests, and folding support; 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, and the second end of the mounting bracket is provided with a first connecting part and a second connecting part. The first end of the first connecting rod is rotatably connected to the first connecting part to form a first axis, and the second end of the first connecting rod is rotatably connected to the second end of the second connecting part to form a second axis. The backrest and the armrest are both rotatably connected to the first end of the second connecting rod to form a third axis, and the backrest is rotatably connected to the second connecting part to form a fourth axis. In this configuration, the first axis, the second axis, the third axis, and the fourth axis all extend along the width direction and are arranged in parallel. The first axis, the second axis, the third axis, and the fourth axis are projected onto a 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. The second connecting rod and the rear end of the armrest are coaxially rotatably connected to one side of the chair back in the width direction. The chair back is provided with an armrest limiting block on one side in the width direction. One end of the armrest limiting block is provided with a first armrest limiting surface. The second connecting rod is provided with an armrest transmission block. One end of the armrest transmission block is provided with a first armrest transmission surface. The armrest is provided with a state limiting block. One end of the state limiting block is provided with a first state limiting surface. The armrest includes a used state and a folded state. When the armrest is in the used state, the first armrest limiting surface abuts against the first state limiting surface, and there is a gap between the first armrest transmission surface and the first state limiting surface. When the armrest is in the folded state, the first armrest transmission surface abuts against the first state limiting surface, and the first armrest limiting surface separates from the first state limiting surface.

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

3. The wheelchair according to claim 2, characterized in that: The side link includes a fixed part and an extension part. The fixed part is fixedly connected to the second end of the bottom link. The first end of the extension part is connected to the fixed part. The second end of the extension part is tilted backward. The first connecting part is disposed on the extension part.

4. The wheelchair according to claim 2, characterized in that: The chair back includes a backrest panel and a chair back support. The back of the backrest panel is connected to the chair back support. The first end of the chair back support is provided with a folding connecting part and a first mating part. The bottom connecting rod is provided with a second mating part. The folding connecting part is rotatably connected to the second connecting part. The first mating part and the second mating part are detachably connected.

5. The wheelchair according to claim 4, characterized in that: The first mating part is located behind the folded connecting part, and the second mating part is located behind the second connecting part.

6. The wheelchair according to claim 4, characterized in that: The first mating part and the second mating part are engaged.

7. The wheelchair according to claim 4, characterized in that: The second end of the bottom connecting rod extends rearward to form the second mating part. The second mating part includes a lower boss. The side of the lower boss facing away from the seat cushion forms an upper limit surface. The first end of the chair back bracket extends forward to form the folding connecting part. The first mating part includes a buckle and a lower limit surface. A groove is formed between the buckle and the lower limit surface. The lower boss can be embedded in the groove, 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 connecting rod is connected to forward-extending adapter arms on both sides in the width direction. The adapter arms are the second connecting parts, and the folding connecting parts are rotatably connected between the two adapter arms.

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

10. The wheelchair according to claim 1, characterized in that: The other end of the handrail limiting block is provided with a second handrail limiting surface, the other end of the handrail transmission block is provided with a second handrail transmission surface, and the other end of the state limiting block is provided with a second state limiting surface. When the handrail is in the use state and flipped up, the second state limiting surface abuts against the second handrail limiting surface, and there is a gap between the second state limiting surface and the second handrail transmission surface. When the handrail is in the folded state, the second state limiting surface abuts against the second handrail limiting surface.

11. The wheelchair according to claim 10, characterized in that: When the handrail is in the folded state, the second state limiting surface abuts against the second handrail limiting surface.

12. The wheelchair according to claim 1, characterized in that: The side of the chair back protrudes to form a connecting post, and the first end of the second connecting rod protrudes along the axial direction of the connecting post to form a mounting ring. The rear end of the armrest has a connecting hole, and the mounting ring is fitted onto the outer circumferential surface of the connecting post. The connecting post is installed in the connecting hole, and the connecting post, mounting ring, and connecting hole are coaxially arranged. The end of the connecting post is provided with a limiting ring, and the inner end face of the limiting ring in the axial direction abuts against the armrest.

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