Folding structure of a wheelchair

Abstract

This utility model relates to the field of wheelchairs, specifically a folding structure for a wheelchair. The tops of the forelimbs and hindlimbs, as well as the front of the seat, are rotatably connected to each other. The rear of the seat, the bottom of the backrest, and the top of the first support frame are rotatably connected to each other. The bottom of the first support frame is rotatably connected to the top of the second support frame, and the second support frame is rotatably connected to the hindlimbs. Connecting rods extend forward from both ends of the first support frame. Telescopic rods are hinged to both ends of the bottom of the backrest, and the front ends of the telescopic rods are hinged to the front ends of the connecting rods. This allows the forelimbs, hindlimbs, backrest, seat, and push rod to be folded up for easy storage and carrying. At the same time, the backrest is rotatably connected to the rear of the seat and the top of the first support frame through its bottom, giving the wheelchair a third form. The backrest can be rotated and tilted against the seat, improving user comfort. Furthermore, the telescopic rods provide traction for the backrest, preventing excessive tilting angle.

Description

Technical Field

[0001] This utility model relates to the field of wheelchair technology, specifically to a folding structure for a wheelchair. Background Technology

[0002] A wheelchair is a chair equipped with wheels that can help replace walking. It is an important mobility tool for the injured, sick, and disabled for home rehabilitation, transportation, medical treatment, and outdoor activities. Most ordinary wheelchairs today consist of a wheelchair frame, wheels, and a seat and backrest. The wheelchair frame is a one-piece structure without movable joints. The one-piece structure of the wheelchair frame has the advantages of being sturdy, stable, reliable, easy to push, and having minimal deformation after long-term use. However, such wheelchairs are inconvenient to store and fold, making them difficult to store and carry, resulting in low convenience of use. Referring to the utility model patent with publication number: CN221904448U, entitled "A Folding Structure for an Aircraft Wheelchair", there is a foldable wheelchair that has two states compared to traditional wheelchairs. It is convenient to use and has a reliable structure. However, this folding structure can only provide two deformation states, and in the unfolded state, the backrest and seat are at a 90-degree angle. Users need to maintain an upright posture for a long time, which is not comfortable. Utility Model Content

[0003] The purpose of this invention is to provide a folding structure for a wheelchair, which aims to solve the problems mentioned above.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a folding structure for a wheelchair, comprising a seat, a backrest, a first support frame, a second support frame, forelimbs, and hindlimbs. The tops of the forelimbs and hindlimbs, and the front of the seat, are rotatably connected to each other. The rear of the seat, the bottom of the backrest, and the top of the first support frame are rotatably connected to each other. The bottom of the first support frame is rotatably connected to the top of the second support frame, and the second support frame is rotatably connected to the hindlimbs. Connecting rods extend forward from both ends of the first support frame. Telescopic rods are hinged to both ends of the bottom of the backrest, and the front ends of the telescopic rods are hinged to the front ends of the connecting rods. A headrest assembly is provided in the middle of the upper side of the backrest, and push rods are symmetrically provided on both sides of the headrest assembly. The push rods are inserted into and rotatable on the backrest.

[0005] Optionally, the backrest includes two symmetrically arranged vertical tubes, and the push rod is L-shaped in general, with one segment of the rod rotatably disposed inside the vertical tube.

[0006] Optionally, the bottom of the two vertical pipes is connected to a horizontal pipe a and the top is connected to a horizontal pipe b. The two telescopic rods are respectively set on the horizontal pipe a and close to one end of the two vertical pipes.

[0007] Optionally, the horizontal tube b has a mounting base in the middle, and the headrest assembly includes a slide rod and a headrest portion. The top of the slide rod is provided with a hinge member that is hinged to the headrest portion, and the slide rod is slidably connected to the mounting base.

[0008] Optionally, a support rod is hinged at the connection between the first support frame and the second support frame, and the front end of the support rod is hinged to the lower part of the forelimb.

[0009] Optionally, a stop bar is bent at the rear of the middle of the first support frame, and a base plate is provided at the rear of the middle of the second support frame. A spring-loaded assembly is provided between the base plate and the stop bar. The spring-loaded assembly includes a swing plate rotatably connected to the base plate and a coil spring provided between the swing plate and the base plate. The stop bar is provided with a limiting pin for limiting the forward swing of the swing plate. The limiting pin is hooked to the front side of the swing plate.

[0010] Optionally, armrest tubes are movably connected to both sides of the backrest via connecting seats.

[0011] Optionally, the connecting seat includes a first seat and a second seat arranged vertically. The first seat is fixedly mounted on the vertical tube, and the handrail tube is mounted on the upper side of the second seat. The front end of the second seat is fixedly connected to the first seat, and the rear end is rotatably connected to the handrail tube via a pivot.

[0012] Compared with the prior art, the advantages of this utility model are as follows: However, this folding structure can only provide two deformation states: folded or unfolded. In its unfolded state, the backrest and seat cushion are at a 90-degree angle, requiring the user to maintain an upright posture for a long time, resulting in insufficient comfort.

[0013] The folding structure of the wheelchair provided in this utility model is designed with a rotatable connection at the junction of the forelimbs, hindlimbs, and seat. The seat, backrest, and first support frame are rotatably connected to each other, and the first and second support frames are rotatably connected. The push rod is rotatably connected to the backrest, giving the wheelchair both foldable and unfoldable forms. The forelimbs, hindlimbs, backrest, seat, and push rod can all be folded up for easy storage and carrying. At the same time, the backrest is rotatably connected to the rear of the seat and the top of the first support frame at the bottom, giving the wheelchair a third form. The backrest can be rotated and tilted against the seat, improving user comfort and eliminating the need for the user to maintain an upright posture for extended periods. Furthermore, two telescopic rods are hinged to the bottom of the backrest and connected to the first support frame, providing traction for the backrest and preventing excessive tilting angle. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a perspective view of the present utility model;

[0016] Figure 2 for Figure 1 Enlarged view of point A in the image;

[0017] Figure 3 This is a frontal view of the first support frame, the second support frame, and the telescopic rod in this utility model.

[0018] Figure 4 This is a schematic diagram showing the rear angle of the first support frame, the second support frame, and the telescopic rod in this utility model;

[0019] Figure 5 for Figure 4 Enlarged view of point B in the image;

[0020] Figure 6 This is a schematic diagram of the headrest assembly in this utility model;

[0021] Figure 7 This is a schematic diagram of the folded state of this utility model;

[0022] Figure 8 This is a schematic diagram of the unfolded state of this utility model;

[0023] Figure 9 This is a schematic diagram of the tilted state of the backrest in this utility model.

[0024] In the diagram: 1. Seat; 2. Backrest; 3. First support frame; 4. Second support frame; 5. Forelimbs; 6. Rear limbs; 7. Headrest assembly; 8. Hand push rod; 9. Telescopic rod; 21. Armrest tube; 22. Vertical tube; 23. a horizontal tube; 24. b horizontal tube; 31. Stop bar; 41. Base plate; 51. Support rod; 71. Slide rod; 72. Headrest part; 74. Hinge; 221. First seat piece; 222. Second seat piece; 311. Limit pin; 401. Swing plate; 402. Coil spring; 710. Mounting base. Detailed Implementation

[0025] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0028] As shown in the figure, a folding structure for a wheelchair includes a seat 1, a backrest 2, a first support frame 3, a second support frame 4, front limbs 5, and rear limbs 6. The bottoms of the front limbs 5 and rear limbs 6 are equipped with casters. The tops of the front limbs 5 and rear limbs 6, and the front part of the seat 1, are rotatably connected to each other. The rear part of the seat 1, the bottom of the backrest 2, and the top of the first support frame 3 are rotatably connected to each other. The bottom of the first support frame 3 is rotatably connected to the top of the second support frame 4, and the second support frame 4 is rotatably connected to the rear limbs 6. The tops of the front limbs 5 and rear limbs 6, and the lower side of the front part of the seat 1, each have a rotating hole (a) through which a pivot is passed, enabling rotatable connections between the various parts. The rear part of the seat 1, the bottom of the backrest 2, and the top of the first support frame 3 each have a rotating hole (b) through which a pivot is passed, enabling rotatable connections between the various parts. The bottom of the first support frame 3 and the second support frame 4... The top of each support frame 3 and 4 is provided with a rotating hole, and the first support frame 3 and the second support frame 4 are connected by a rotating shaft. Both ends of the first support frame 3 have connecting rods extending forward. The connecting rods and the first support frame 3 are an integral structure and can be fixedly connected by welding. Both ends of the bottom of the backrest 2 are hinged with telescopic rods 9, and the front end of the telescopic rod 9 is hinged to the front end of the connecting rod. The telescopic rod 9 can be a hydraulic rod or a mechanical spring rod, etc. It should be noted that the telescopic rod 9 has a switch for controlling the movement or fixation of the telescopic end. The switch is connected to a brake cable and controlled by the brake cable. Preferably, the brake cable can extend to the push rod 8. When the wheelchair is in the normal state, the telescopic end is fixed in the extended state. If the user needs to adjust the tilt of the backrest 2, they only need to pull the brake cable, and the telescopic end of the telescopic rod 9 becomes movable. After the user sits down, they can lean against the backrest 2. The user's weight causes the backrest 2 to tilt, i.e. Figure 9 As shown, the backrest 2 tilts to the left, and the telescopic end of the telescopic rod 9 retracts. The movement of the telescopic rod 9 provides a certain damping during the tilting process of the backrest 2, preventing the backrest 2 from tilting too quickly and also preventing excessive tilting, thus improving the user experience and making the user more comfortable without having to maintain an upright posture for a long time. A headrest assembly 7 is provided in the middle of the upper side of the backrest 2, and push rods 8 are symmetrically provided on both sides of the headrest assembly 7. The push rods 8 are inserted into the backrest 2 and can rotate on the backrest 2. The push rods 8 are set as two separate parts, respectively set on the left and right sides of the backrest 2. The reserved middle position for the headrest assembly 7 can support the user's head, making the user's head more comfortable when leaning back.

[0029] In the folding structure of the wheelchair provided by this utility model, the connection between the forelimbs 5, hindlimbs 6, and seat 1 is set as a rotatable connection. The seat 1, backrest 2, and first support frame 3 are rotatably connected to each other. The first support frame 3 and the second support frame 4 are rotatably connected. The push rod 8 is rotatably connected to the backrest 2, so that the wheelchair has two forms: foldable and unfoldable. The forelimbs 5, hindlimbs 6, backrest 2, seat 1, and push rod 8 can all be folded up for easy folding, storage, and carrying. Specifically, people can swing the backrest 2 and seat 1 to bring them closer together. At this time, the backrest 2, seat 1, and first support frame 3 all rotate around the rotation hole b, the seat 1, forelimbs 5 and hindlimbs 6 rotate around the rotation hole a, and the first support frame 3, second support frame 4, and support rod 51 rotate around the rotation hole c. The first support frame 3 and second support frame 4 gradually swing towards the support rod 51. In addition, the push rod 8 rotates to be close to the rear side of the backrest 2, finally forming the shape shown below. Figure 7 The folding effect shown is that the backrest 2 is connected to the rear of the seat 1 and the top of the first support frame 3 by rotating at the bottom, so that the wheelchair has a third form. The backrest 2 can rotate and tilt against the seat 1, improving the user's comfort. The user does not need to maintain an upright posture for a long time. In addition, two telescopic rods 9 are hinged to the bottom of the backrest 2 and are hinged to the first support frame 3 through the two telescopic rods 9. The telescopic rods 9 provide traction for the backrest 2 and prevent the backrest 2 from tilting too much.

[0030] In some embodiments, the backrest 2 includes two symmetrically arranged vertical tubes 22, with a horizontal tube 23 at the bottom and a horizontal tube 24 connected to the top of the two vertical tubes 22. The push rod 8 is generally L-shaped, referring to the shape of the push rod 8 of an existing wheelchair. Specifically, it is divided into two segments. One segment is used for people to hold and push the wheelchair. It should be noted that the other segment is rotatably disposed inside the vertical tube 22. Furthermore, the segment inside the vertical tube 22 is provided with a positioning component. The top of the vertical tube 22 is provided with a positioning hole. The positioning component and the positioning hole realize the positioning of the push rod 8 in the unfolded and folded states. The positioning component includes a spring and a positioning key. The positioning key can elastically extend and retract within the push rod 8 under the action of the spring, and the positioning key cooperates with the positioning hole. Specifically, the positioning key is located at the front of the push rod 8, and the positioning hole is located at the front and side of the vertical tube 22. When the push rod 8 is in the unfolded state, the positioning key cooperates with the positioning hole at the front of the vertical tube 22. When the push rod 8 is folded, the positioning key cooperates with the positioning hole on the side of the vertical tube 22. The bottom of the two vertical tubes 22 is connected to a horizontal tube 23 and the top is connected to a horizontal tube 24. The two telescopic rods 9 are respectively set on the horizontal tube 23 and close to one end of the two vertical tubes 22. By symmetrically arranging the two telescopic rods 9 and setting them close to the end of the vertical tube 22, that is, close to the connection between the vertical tube 22 and the horizontal tube 23, when the user leans against the backrest 2, the two telescopic rods 9 can share the pressure, making the backrest 2 more balanced and stable, improving the deformation resistance of the backrest 2. People can also push the wheelchair by holding the horizontal tube 24. The horizontal tube 24 (b) is provided with a mounting base 710 in the middle. The headrest assembly 7 includes a slide rod 71 and a headrest part 72. The top of the slide rod 71 is provided with a hinge 74 that is hinged to the headrest part 72. The slide rod 71 is slidably connected to the mounting base 710. The headrest assembly 7 can adjust its vertical position and the tilt angle of the headrest part 72. Specifically, the mounting base 710 is fixed to the middle of the horizontal tube 24 (b), the slide rod 71 slides vertically on the mounting base 710, and the slide rod 71 is connected to the headrest part 72 through the hinge 74, so that the headrest part 72 can move on the slide rod 71 and tilt. Furthermore, the slide rod 71 has positioning holes arranged from top to bottom. Screws are provided on the mounting base 710. After the height of the headrest part 72 is adjusted, the screws can be connected to the corresponding positioning holes to fix the slide rod 71 and prevent the headrest part 72 from sliding down. Moreover, when the wheelchair needs to be folded, the headrest part 72 can also swing at a certain angle to reduce its height.

[0031] In some embodiments, a support rod 51 is hinged at the connection between the first support frame 3 and the second support frame 4. The other end of the support rod 51 is hinged to the lower part of the forelimb 5. In the unfolded state, the bottom of the first support frame 3 and the top of the second support frame 4 are slightly tilted forward, thereby forming an angle behind the first support frame 3 and the second support frame 4. The front end of the support rod 51 is hinged to the lower part of the forelimb 5. Under the action of the support rod 51, the first support frame 3 and the second support frame 4 are prevented from continuing to rotate, that is, the angle formed by the first support frame 3 and the second support frame 4 is prevented from narrowing. At the same time, the front end of the support rod 51 bends downward and is hinged to the bottom of the forelimb 5, thereby forming a... Figure 3 The triangular support structure shown ensures that the angle formed by the tops of the forelimbs 5 and hindlimbs 6 will not expand or shrink when the user is seated in the seat 1, making the folding structure more stable in the unfolded state.

[0032] In some embodiments, a stop bar 31 is bent at the rear side of the middle of the first support frame 3, and a base plate 41 is provided at the rear side of the middle of the second support frame 4. A spring-loaded assembly is provided between the base plate 41 and the stop bar 31. The spring-loaded assembly includes a swing plate 401 rotatably connected to the base plate 41 and a coil spring 402 provided between the swing plate 401 and the base plate 41. The stop bar 31 is provided with a limiting pin 311 for limiting the forward swing of the swing plate 401. The limiting pin 311 is hooked on the front side of the swing plate 401. The spring-loaded assembly provided between the stop bar 31 and the base plate 41 can ensure the stability of the first support frame 3 and the second support frame 4 in the unfolded state. The swing plate 401 of the spring-loaded assembly is kept tightly against the limiting pin 311 under the action of the coil spring 402. The spring-loaded assembly generates a certain resistance to prevent the bottom of the first support frame 3 and the top of the second support frame 4 from swinging backward. It can also be used in conjunction with the telescopic rod 9. After the telescopic rod 9 is turned on, the user leans against it, and the backrest 2 tilts while compressing the telescopic rod 9. Under the action of the telescopic rod 9, the first support frame 3 will swing slightly. Therefore, a rotatable connection needs to be set between the telescopic rod 9 and the first support frame 3. At this time, due to the setting of the coil spring 402, the swing plate 401 is kept tightly against the limit pin 311 to prevent the first support frame 3 and the second support frame 4 from folding when the backrest 2 is tilted. When folding is required, simply pull the swing plate 401 to move it away from the limit pin 311, providing space for the first support frame 3 and the second support frame 4 to fold. Then, rotate the first support frame 3 clockwise and the second support frame 4 counterclockwise so that the first support frame 3 and the second support frame 4 gradually approach the support rod 51.

[0033] In some embodiments, armrest tubes 21 are movably connected to both sides of the backrest 2 via connecting seats 22. Users can rest their arms on the armrest tubes 21 for greater comfort. The armrest tubes 21 are movable within the backrest 2 and can also be folded. The connecting seat 22 includes a vertically arranged first seat member 221 and a second seat member 222. The first seat member 221 is fixedly mounted on the vertical tube 22. The armrest tubes 21 are located on the upper side of the second seat member 222. The front end of the second seat member 222 is fixedly connected to the first seat member 221, and the rear end has a pivot shaft, which rotatably connects to the armrest tube 21. The upper side of the second seat member 222 has a groove matching the armrest tube 21, which better supports the armrest tube 21 when it is unfolded, improving its support capacity. Furthermore, the armrest tubes 21 can be folded to both sides of the backrest 2 and can be parallel to the backrest 2 for easy storage and carrying.

[0034] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made using the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A folding structure for a wheelchair, characterized in that, The device includes a seat, a backrest, a first support frame, a second support frame, forelimbs, and hindlimbs. The tops of the forelimbs and hindlimbs, as well as the front of the seat, are rotatably connected to each other. The rear of the seat, the bottom of the backrest, and the top of the first support frame are rotatably connected to each other. The bottom of the first support frame is rotatably connected to the top of the second support frame, and the second support frame is rotatably connected to the hindlimbs. Connecting rods extend forward from both ends of the first support frame. Telescopic rods are hinged to both ends of the bottom of the backrest, and the front ends of the telescopic rods are hinged to the front ends of the connecting rods. A headrest assembly is provided in the middle of the upper side of the backrest, and push rods are symmetrically provided on both sides of the headrest assembly. The push rods are inserted into and can rotate on the backrest.

2. The folding structure of a wheelchair according to claim 1, characterized in that, The backrest includes two symmetrically arranged vertical tubes, and the push rod is L-shaped with one segment rotatably mounted inside the vertical tube.

3. The folding structure of a wheelchair according to claim 2, characterized in that, The two vertical pipes are provided with a horizontal pipe a at the bottom and connected to a horizontal pipe b at the top. The two telescopic rods are respectively provided on the horizontal pipe a and close to one end of the two vertical pipes.

4. The folding structure of a wheelchair according to claim 3, characterized in that, The horizontal tube b has a mounting base in the middle. The headrest assembly includes a slide rod and a headrest part. The top of the slide rod is provided with a hinge that is hinged to the headrest part. The slide rod is slidably connected to the mounting base.

5. The folding structure of a wheelchair according to claim 1, characterized in that, A support rod is hinged at the connection between the first support frame and the second support frame, and the front end of the support rod is hinged to the lower part of the forelimb.

6. The folding structure of a wheelchair according to claim 5, characterized in that, The first support frame has a stop bar bent at the rear of the middle section, and the second support frame has a base plate at the rear of the middle section. A spring-loaded assembly is provided between the base plate and the stop bar. The spring-loaded assembly includes a swing plate rotatably connected to the base plate and a coil spring provided between the swing plate and the base plate. The stop bar is provided with a limiting pin for limiting the forward swing of the swing plate. The limiting pin is hooked to the front side of the swing plate.

7. The folding structure of a wheelchair according to claim 1, characterized in that, Both sides of the backrest are movably connected to armrest tubes via connecting seats.

8. The folding structure of a wheelchair according to claim 7, characterized in that, The connecting seat includes a first seat and a second seat that are vertically arranged. The first seat is fixedly arranged on the vertical tube, and the handrail tube is arranged on the upper side of the second seat. The front end of the second seat is fixedly connected to the first seat, and the rear end is rotatably connected to the handrail tube through a rotating shaft.

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