Folding structure and wheelchair thereof

Abstract

The utility model provides a wheelchair field, concretely is a kind of folding structure and its wheelchair, including seat frame, backrest frame, first support frame, second support frame, foreleg and hind leg, the top of foreleg and hind leg and the front of seat frame are rotatably connected each other, the rear of seat frame, the bottom of backrest frame and the top of first support frame are rotatably connected each other, the bottom of first support frame is rotatably connected on the top of second support frame, and still rotatably connected with support arm, the front end of support arm is hinged in foreleg lower part, the second support frame is rotatably connected on hind leg, the front end of telescopic link is hinged in connecting rod front end, the connecting position of each part is set as rotatable connection structure, so that it has two kinds of forms of folding and unfolding, folding storage and carrying are convenient, improve applicability, backrest frame can be rotated and inclined on seat frame at the same time, provide comfortable riding experience for user, user need not long time to keep straight waist state.

Description

Technical Field

[0001] This utility model relates to the field of wheelchair technology, specifically to a folding structure and the wheelchair thereof. 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. Existing ordinary wheelchairs generally 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, as the wheelchair frame cannot be folded and folded, which is not conducive to storage and carrying, and its applicability is not high. Referring to the utility model patent with publication number: CN221904448U, entitled "A Folding Structure for an Aircraft Wheelchair", there is an existing foldable wheelchair. Compared with traditional wheelchairs, it has the characteristics of convenient folding and unfolding and reliable structure. However, this folding structure can only provide two deformation states: folded or unfolded. In the unfolded state, the backrest and seat are at a 90-degree angle, which requires the user to maintain an upright posture for a long time, resulting in insufficient comfort. Utility Model Content

[0003] The purpose of this invention is to provide a folding structure and its 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, including a seat frame, a backrest frame, a first support frame, a second support frame, a front limb, and a rear limb. The tops of the front limb and the rear limb, as well as the front part of the seat frame, are rotatably connected to each other. The rear part of the seat frame, the bottom of the backrest frame, 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 a support arm is also rotatably connected thereto. The front end of the support arm is hinged to the lower part of the front limb. The second support frame is rotatably connected to the rear limb. A connecting rod extends forward from the first support frame. A telescopic rod is hinged to the bottom of the backrest frame, and the front end of the telescopic rod is hinged to the front end of the connecting rod.

[0005] Optionally, in the unfolded state, the second support frame is disposed at the lower part of the first support frame, the support arm is disposed at the front end of the connection between the first support frame and the second support frame, and the bottom of the first support frame and the top of the second support frame are tilted forward to form a negative angle structure on the side away from the support arm; in the folded state, the first support frame is located behind the second support frame, and the connecting rod is attached to the second support frame.

[0006] Optionally, the top of the forelimbs and hindlimbs, as well as the front of the seat frame, are provided with a rotating hole; the rear of the seat frame, the bottom of the backrest frame, and the top of the first support frame are provided with a rotating hole; and the bottom of the first support frame, the top of the second support frame, and the rear end of the support arm are provided with a rotating hole.

[0007] Optionally, in the unfolded state, the connecting rod gradually tilts upward from back to front, and a U-shaped ear plate is provided at the front end. The front end of the connecting rod is hinged to the opening of the U-shaped ear plate, and the telescopic rod is provided inside the lower side of the U-shaped ear plate.

[0008] Optionally, the first support frame has a stop bar bent at the rear, and the second support frame has a base plate at the rear. 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 an elastic element 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.

[0009] Optionally, the upper side of the second support frame is provided with a clip for engaging with the first support frame.

[0010] A wheelchair is also provided, which includes the aforementioned folding structure, with omnidirectional wheels at the bottom of the forelimbs and rollers at the bottom of the hindlimbs.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] The present invention provides a seat frame, backrest frame, first support frame, second support frame, front limbs, and rear limbs, with the connecting parts of each part configured as rotatable connection structures. By setting the connection points of the front limbs, rear limbs, and seat frame as rotatable connections, and the seat frame being rotatably connected to the backrest frame and the first support frame, and the first support frame, the second support frame, and the support arm being rotatably connected, it has two forms: foldable and unfoldable, which is convenient for folding, storage, and carrying, improving its applicability. At the same time, the backrest frame is rotatably connected to the rear of the seat frame and the top of the first support frame through its bottom, and then rotatably connected to the support arm through the first support frame, so that the backrest frame can be tilted backward against the seat frame, providing a comfortable sitting experience for the user. The user does not need to maintain an upright posture for a long time. Moreover, a telescopic rod is also hinged to the bottom of the backrest frame and is hinged to the first support frame through the telescopic rod, using the telescopic rod to provide traction for the backrest frame and prevent the backrest frame from tilting too much. Attached Figure Description

[0013] 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.

[0014] Figure 1 This is a schematic diagram of a folding structure according to the present invention;

[0015] Figure 2 This is an exploded view of a folding structure according to the present invention.

[0016] Figure 3 This is a schematic diagram of the folded state of the folding structure in this utility model.

[0017] Figure 4 This is a schematic diagram of the unfolded state of the folding structure in this utility model.

[0018] Figure 5 This is a schematic diagram showing the connection between the first support frame, the second support frame, and the support arm in this utility model.

[0019] Figure 6 This is a schematic diagram of the tilted state of the backrest frame in this utility model.

[0020] Figure 7 This is a schematic diagram of the structure of the first support frame and the second support frame in this utility model.

[0021] Figure 8 for Figure 7 Enlarged view of point A in the middle.

[0022] Figure 9 This is a perspective view of the wheelchair of this utility model.

[0023] Figure 10 This is a perspective view of the wheelchair of this utility model in its folded state.

[0024] In the diagram: 1. Seat frame; 2. Backrest frame; 3. First support frame; 4. Second support frame; 5. Front limbs; 6. Rear limbs; 7. Support arm; 8. Telescopic rod; 9. Casters; 10. Rollers; 31. Connecting rod; 32. Stop bar; 44. Clip; 81. U-shaped ear plate; 101. a. Rotating hole; 102. b. Rotating hole; 103. c. Rotating hole; 401. Base plate; 402. Swing plate; 403. Elastic element; 404. Limit pin. 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] The present invention will now be described in conjunction with the accompanying drawings.

[0029] like Figure 1 and Figure 8 As shown, a folding structure includes a seat frame 1, a backrest frame 2, a first support frame 3, a second support frame 4, front limbs 5, and rear limbs 6. The backrest frame 2 is located at the rear of the seat frame 1, and the bottom of the backrest frame 2, the rear of the seat frame 1, and the top of the first support frame 3 overlap. The second support frame 4 is located below the first support frame 3. The tops of the front limbs 5 and the rear limbs 6, and the front of the seat frame 1 are rotatably connected to each other. The rear of the seat frame 1, the bottom of the backrest frame 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 a support arm 7 is also rotatably connected thereto. The front end of the support arm 7 is hinged to the lower part of the front limbs 5, thus forming a folding structure as shown in the diagram. Figure 4 The triangular support structure shown ensures that, when the user is seated on the seat frame 1, the angle formed by the tops of the forelimbs 5 and hindlimbs 6 will not widen or narrow due to the support arm 7. The support arm 7 is preferably as follows: Figure 5As shown, the front part bends downward and is hinged to the lower part of the forelimb 5. The second support frame 4 is rotatably connected to the hindlimb 6. The first support frame 3 extends forward and is provided with a connecting rod 31. The bottom of the backrest frame 2 is hinged with a telescopic rod 8. The front end of the telescopic rod 8 is hinged to the front end of the connecting rod 31. The telescopic rod 8 can be a hydraulic rod or a mechanical spring rod, etc., mainly serving to assist in changing the shape. At the same time, the telescopic rod 8 has a switch to control the movement of the telescopic rod 8. The backrest frame 2, the hindlimb 6, and the forelimb 5 all include two connecting parts and a transverse support rod between the two connecting parts. The first support frame 3 and the second support frame 4 are both U-shaped, and when unfolded, the transverse sides of the first support frame 3 and the second support frame 4 are close to each other, forming a negative angle structure. The negative angle structure is as follows: Figure 5 As shown, the left sides of the first support frame 3 and the second support frame 4 form an angle of less than 180 degrees. At the same time, the support arm 7 is set in front of the angle between the first support frame 3 and the second support frame 4. When unfolded, the support arm 7 blocks the angle between the first support frame 3 and the second support frame 4 from further narrowing.

[0030] When folding is required, simply pry open the seat frame 1 and backrest frame 2. The seat frame 1 and backrest frame 2 will swing around the rotating hole 102 (b) until they are close to each other. At the same time, the first support frame 3 and the second support frame 4 will swing, causing both the first support frame 3 and the second support frame 4 to move closer to the support arm 7. That is, the first support frame 3 swings clockwise and the second support frame 4 swings counterclockwise, and the front limbs 5 and the hind limbs 6 move closer to each other, reducing the angle between them, ultimately forming a folded shape. Figure 3 The state of... When it needs to be unfolded, first pry the backrest frame 2 and seat frame 1 apart, while simultaneously moving the rotating hole 103 from left to right, that is, the first support frame 3 swings counterclockwise and the second support frame 4 swings clockwise, until the first support frame 3 and the second support frame 4 re-form a negative angle structure, at which point it is as follows... Figure 4 The backrest frame 2 is positioned vertically on the seat frame 1, as shown in the diagram. When the user sits down, they can lean against the backrest frame 2. Simply turn on the switch of the telescopic rod 8 to extend or retract it. Under weight pressure, the backrest frame 2... Figure 6As shown, the backrest frame 2 tilts to the left while compressing the telescopic rod 8. The telescopic rod 8 provides a certain amount of damping to prevent the backrest frame 2 from tilting too quickly or excessively, thus improving the user experience and making the user more comfortable without having to maintain an upright posture for a long time. After the tilting action is completed, the switch of the telescopic rod 8 is turned off, keeping the telescopic rod 8 in this state. When it is necessary to restore the backrest frame 2 to its upright position, the switch of the telescopic rod 8 is turned on again, and the automatic restoring ability of the telescopic rod 8 assists the backrest frame 2 to return to the upright position. In addition, the user can also control the telescopic rod 8 to maintain a certain compressed state through the switch. For example, when the telescopic rod 8 is compressed to half and the backrest frame 2 is tilted at 20°, the switch can be turned off to keep the telescopic rod 8 in place, thus keeping the backrest frame 2 in a 20° tilted state.

[0031] In some embodiments, in the unfolded state, the first support frame 3 is disposed at the lower part of the backrest frame 2, the second support frame 4 is disposed at the lower part of the first support frame 3 and overlaps the rear leg 6, the support arm 7 is disposed at the front end of the connection between the first support frame 3 and the second support frame 4, and the bottom of the first support frame 3 and the top of the second support frame 4 are tilted forward to form a negative angle structure on the side away from the support arm 7; in the folded state, the first support frame 3 is located behind the second support frame 4, and the connecting rod 31 overlaps the second support frame 4.

[0032] In some embodiments, the top of the forelimb 5 and the hindlimb 6, as well as the front of the seat frame 1, are provided with a rotating hole 101. During assembly, the a rotating hole 101 on the top of the forelimb 5 and the hindlimb 6, and the a rotating hole 101 on the front of the seat frame 1 are overlapped and connected by a pin. It should be noted that the front of the seat frame 1 is provided with a connecting ear, and the a rotating hole 101 is provided on the connecting ear. The rear of the seat frame 1, the bottom of the backrest frame 2, and the top of the first support frame 3 are provided with b rotating holes 102, and connected by b pins. The bottom of the first support frame 3, the top of the second support frame 4, and the rear end of the support arm 7 are provided with c rotating holes 103, and connected by c pins. The b rotating holes 102 overlap and the c rotating holes 103 overlap. The a pin, b pin, and c pin are all straight rod structures.

[0033] In some embodiments, when in the unfolded state, the connecting rod 31 gradually tilts upward from back to front, and a U-shaped ear plate 81 is provided at the front end. The front end of the connecting rod 31 is hinged to the opening of the U-shaped ear plate 81. The telescopic rod 8 is provided on the lower side inside the U-shaped ear plate 81. The first support frame 3 and the telescopic rod 8 are rotatably connected by the U-shaped ear plate 81. The U-shaped ear plate 81 is fixed to the telescopic rod 8 and rotatably connected to the first support frame 3.

[0034] In some embodiments, a stop bar 32 is bent at the rear of the first support frame 3, and a base plate 401 is provided at the rear of the second support frame 4. A spring-loaded assembly is provided between the base plate 401 and the stop bar 32. The spring-loaded assembly includes a swing plate 402 rotatably connected to the base plate 401 and an elastic member 403 disposed between the swing plate 402 and the base plate 401. The stop bar 32 is provided with a limiting pin 404 for limiting the forward swing of the swing plate 402. The limiting pin 404 is hooked on the front side of the swing plate 402. This spring-loaded assembly is used in conjunction with the telescopic rod 8. After the telescopic rod 8 is turned on, the backrest frame 2 tilts and compresses the telescopic rod due to the user's leaning. 8. The telescopic rod 8 is pushed forward. Under the action of the telescopic rod 8, the first support frame 3 will swing slightly. Therefore, a rotatable connection needs to be set between the telescopic rod 8 and the first support frame 3. At this time, due to the setting of the elastic element 403, the swing plate 402 is kept tightly against the limit pin 404 to prevent the first support frame 3 and the second support frame 4 from folding when the backrest frame 2 is tilted. When folding is required, simply pull the swing plate 402 to move it away from the limit pin 404, 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 arm 7.

[0035] In some embodiments, the upper side of the second support frame 4 is provided with a locking member 44 for engaging with the first support frame 3. Both the first support frame 3 and the second support frame 4 are U-shaped, and when unfolded, the horizontal edges of the first support frame 3 and the second support frame 4 are close to each other. At this time, the locking member 44 fixed on the horizontal edge of the second support frame 4 engages with the horizontal edge of the first support frame 3, improving the connection strength between the first support frame 3 and the second support frame 4. At the same time, it allows the first support frame 3 to rotate about the axis of the locking member 44 around the second support frame 4, which is used in conjunction with the spring-loaded assembly. When it is necessary to adjust the spring-loaded assembly, the spring-loaded assembly can be used to adjust the spring-loaded assembly. When the wheelchair is folded, the swing plate 402 can be engaged to provide space for the first support frame 3 and the second support frame 4 to move. Then, the first support frame 3 is rotated clockwise and the second support frame 4 is rotated counterclockwise, causing the first and second support frames 3 and 4 to gradually move closer to the support arm 7. When the first and second support frames 3 and 4 have rotated to a certain angle, the limiting pin 404 disengages from the swing range of the swing plate 402. At this point, the swing plate 402 can be released. Due to the action of the elastic element 403, the swing plate 402 swings forward until it abuts against the horizontal edge of the second support frame 4. (See reference...) Figure 3-6 Then swing the first support frame 3 clockwise and the second support frame 4 counterclockwise. It should be noted that the first support frame 3, the second support frame 4 and the support arm 7 are rotatably connected to each other. When one swings, the other two will also move synchronously. As the first support frame 3 swings, it disengages from the locking piece 44. Since the two are also connected to the support arm 7 through the C-pin, the support arm 7 will also swing to the left.

[0036] like Figure 9 and Figure 10 As shown, a wheelchair includes the aforementioned folding structure. The front limbs 5 are equipped with casters 9 at their bottom, and the rear limbs 6 are equipped with rollers 10 at their bottom. Furthermore, when the wheelchair is in the folded state, a stop bar 32 provides support. The stop bar 32 and the two rollers 10 form three ground-contact support points, allowing the wheelchair to function smoothly in the folded state. Figure 10 As shown, it can be placed vertically, which is convenient for placing a folded wheelchair. Further explanation: the forelimb 5 can also be equipped with a sleeve, which can be used to attach a foot pedal, making it convenient for the user to place their feet.

[0037] The wheelchair consists of a seat frame 1, a backrest frame 2, a first support frame 3, a second support frame 4, front limbs 5, and rear limbs 6. By setting the connecting parts of each part as a rotating connection structure, that is, by setting the connection between the front limbs 5, rear limbs 6, and seat frame 1 as a rotating connection, the seat frame 1 is rotatably connected to the backrest frame 2 and the first support frame 3, and the first support frame 3, the second support frame 4, and the support arm 7 are rotatably connected, so that it can be folded and unfolded, which is convenient for folding, storage and carrying, and improves its applicability. At the same time, the backrest frame 2 is rotatably connected to the rear of the seat frame 1 and the top of the first support frame 3 through the bottom, and then the first support frame 3 is rotatably connected to the support arm 7, so that the backrest frame 2 can rotate backward and tilt against the seat frame 1, providing a comfortable riding experience for the user. The user does not need to maintain an upright posture for a long time. Moreover, the bottom of the backrest frame 2 is also hinged with a telescopic rod 8, which is hinged to the first support frame 3 through the telescopic rod 8. The telescopic rod 8 provides traction for the backrest frame 2 and prevents the backrest frame 2 from tilting too much.

[0038] 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, characterized in that, The device includes a seat frame, a backrest frame, 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 frame, are rotatably connected to each other. The rear of the seat frame, the bottom of the backrest frame, 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 is also rotatably connected to a support arm. The front end of the support arm is hinged to the lower part of the forelimb. The second support frame is rotatably connected to the hindlimb. A connecting rod extends forward from the first support frame. A telescopic rod is hinged to the bottom of the backrest frame, and the front end of the telescopic rod is hinged to the front end of the connecting rod.

2. The folding structure according to claim 1, characterized in that, In the unfolded state, the second support frame is located at the lower part of the first support frame, and the support arm is located at the front end of the connection between the first support frame and the second support frame. The bottom of the first support frame and the top of the second support frame are tilted forward, thereby forming a negative angle structure on the side away from the support arm. In the folded state, the first support frame is located behind the second support frame, and the connecting rod overlaps the second support frame.

3. The folding structure according to claim 1, characterized in that, The top of the forelimbs and hindlimbs, as well as the front of the seat frame, are provided with a rotating hole (a); the rear of the seat frame, the bottom of the backrest frame, and the top of the first support frame are provided with a rotating hole (b); the bottom of the first support frame, the top of the second support frame, and the rear end of the support arm are provided with a rotating hole (c).

4. A folding structure according to claim 1, characterized in that, When unfolded, the connecting rod gradually tilts upward from back to front, and a U-shaped lug is provided at the front end. The front end of the connecting rod is hinged to the opening of the U-shaped lug, and the telescopic rod is located inside the lower side of the U-shaped lug.

5. A folding structure according to claim 1, characterized in that, The first support frame has a stop bar bent at the rear, and the second support frame has a base plate at the rear. 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 an elastic element 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.

6. A folding structure according to claim 1, characterized in that, The upper side of the second support frame is provided with a clip for engaging with the first support frame.

7. A wheelchair, characterized in that, The invention includes a folding structure as described in any one of claims 1-6, wherein the bottom of the forelimb is provided with a caster wheel and the bottom of the hindlimb is provided with a roller.

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