Folding wheelchair

Abstract

A folding wheelchair, characterized in that it comprises a front support frame (10), a backrest bracket (20), a rear support frame (30), a bracket connecting rod (40), a seat bracket (60), a seat connecting rod (50) and an armrest (70); wherein the front support frame (10), the backrest bracket (20), the rear support frame (30), and the bracket connecting rod (40) are pivotally connected to one another to form a first connecting rod mechanism; the seat connecting rod (50) is pivotally connected to the front support frame (10) and the seat bracket (60), respectively; and the front support frame (10), the backrest bracket (20), the seat bracket (60), and the seat connecting rod (50) form a second connecting rod mechanism; wherein the armrest (70) is arranged on both sides of the backrest support (20) and the armrest (70), the front support frame (10), the rear support frame (30) and the backrest support (20) converge on both sides of the seat support (60).

Description

Technical field

[0001] The present application relates to the technical field of medical instruments and, in particular, to a folding wheelchair. State of the art

[0002] Folding wheelchairs are a means of transportation for specific population groups such as people with disabilities, the elderly, and those with infirmities, as well as patients undergoing medical and clinical rehabilitation. Folding wheelchairs are widely used because they are foldable, easy to carry, and space-saving.

[0003] The conventional folding wheelchair includes a front support frame, a backrest bracket, a rear support frame, a bracket connecting rod, a seat bracket, and a seat connecting rod. Among them, the front support frame, the backrest bracket, the rear support frame, and the bracket connecting rod are pivotally connected to each other to form a first connecting rod mechanism that is foldable and deformable to enable the front support frame, the backrest bracket, and the rear support frame to be folded together.

[0004] As mentioned above, the front support frame, seat connecting rod, seat bracket, and backrest bracket constitute a second connecting rod mechanism, which is foldable and deformable. When the first connecting rod mechanism moves, the second connecting rod mechanism can move accordingly, ensuring that the seat bracket can be folded accordingly during the folding and unfolding process of the folding wheelchair. However, the folding space between the backrest bracket and the seat bracket of the above-mentioned folding wheelchair is small, and the backrest cushion and / or seat cushion must be removed at the time of folding, which makes the folding process cumbersome and results in a poor user experience. Brief summary of the invention

[0005] The aim of the present application is to provide a folding wheelchair that solves the problem that the folding wheelchair easily tips over after folding and improves the user experience.

[0006] To achieve the above-mentioned object, the embodiments of the present application provide the following technical solution.

[0007] The embodiment of the present application provides a foldable wheelchair comprising a front support frame, a backrest bracket, a rear support frame, a bracket connecting rod, a seat bracket, and a seat connecting rod; wherein the front support frame, the backrest bracket, the rear support frame, and the bracket connecting rod are pivotally connected to each other to form a first connecting rod mechanism; the seat connecting rod is pivotally connected to the front support frame and the seat bracket, respectively; and the front support frame, the backrest bracket, the seat bracket, and the seat connecting rod form a second connecting rod mechanism; and a pivot point of the backrest bracket and the seat bracket is arranged above a center plane of the seat bracket.

[0008] In one possible embodiment, the front support frame, the backrest bracket, the rear support frame and the bracket connecting rod of the first connecting rod mechanism are in turn pivotally connected to each other so that the pivot points a, b, c and d are formed, and a distance relationship between the pivot points: ab: bc: cd: da = 1: 1.1 - 1.2: 2.4 - 3: 2.4 - 2.8 is satisfied; the front support frame, the seat connecting rod, the seat bracket and the backrest bracket of the second connecting rod mechanism are in turn connected to each other to form the pivot points e, f, g and a, and the hinge point g is located above the center plane of the seat bracket; and a distance relationship between the hinge points: ef : fg : ga : ae = 1~1.8 : 2.8~4.8 : 1 : 2.2-3.2 is satisfied.

[0009] In one possible implementation, the distance relationship in the first connecting rod mechanism between the hinge points satisfies: ab: bc: cd: da = 1: 1.2: 2.75: 2.7; and / or the distance relationship in the second connecting rod mechanism between the hinge points satisfies: ef: fg: ga: ae = 1.65: 4.7: 1: 3.1.

[0010] In one possible embodiment, the backrest bracket is provided with a first fastening portion configured to fasten a backrest cushion, and the first fastening portion is inclined rearward along a first direction.

[0011] In one possible embodiment, a vertical distance between the articulation point g and the center plane of the seat bracket is X and a vertical distance between the articulation point g and a center plane of the first attachment portion is Y, and X and Y satisfy the condition 60 mm ≤ X + Y ≤ 110 mm.

[0012] In one possible embodiment, the seat bracket is arranged obliquely with respect to a support plane of a wheel set supporting the folding wheelchair, and an end of the seat bracket remote from the pivot point g is inclined upward; the seat bracket is configured such that the seat bracket is rotatable counterclockwise when the first fixing portion rotates counterclockwise to fold the folding wheelchair; and when the folding wheelchair is in a folded state, the center plane of the seat bracket is parallel to the support plane.

[0013] In one possible embodiment, an angular range of a backrest inclination angle of the first attachment portion is 5°~20°; an angular range of an inclination angle of the seat bracket is 2°~8°.

[0014] In one possible embodiment, the folding wheelchair has front wheels, rear wheels, and a support wheel; the front wheels are attached to the front support frame, and the rear wheels are attached to the rear support frame; the support connecting rod has a main body portion and an extension portion, the main body portion being arranged between the rear support frame and the front support frame, and the extension portion being arranged laterally of the rear support frame; the extension portion is arranged obliquely downward, and the angle between the extension portion and the main body portion is an obtuse angle;the support wheel is arranged at one end of the extension portion remote from the main body portion, and the support wheel is configured such that, when the folding wheelchair is in a folded state, both the support wheel and the rear wheels rest on the support plane;

[0015] In one possible embodiment, the folding wheelchair further comprises a locking hook mechanism; the locking hook mechanism comprises a link rod and at least one locking hook, and the locking hook is arranged at one end of the link rod; the locking hook is rotatably connected to the backrest bracket, and a torsion spring is arranged between the locking hook and the backrest bracket, and the torsion spring is configured to exert a locking force on the locking hook; the rear support frame is provided with a retaining pin formed corresponding to the locking hook, and the locking hook is provided with a limiting groove formed corresponding to the retaining pin, and the locking hook is clamped to the retaining pin by the limiting groove.

[0016] In one possible embodiment, the locking hook mechanism includes two locking hooks, and the two locking hooks are symmetrically arranged at both ends of the link rod; the locking hook is provided with a wrench, and the backrest bracket is provided with a positioning protrusion, and the wrench is configured such that the limit groove of the locking hook is clamped to the retaining pin when the wrench abuts the positioning protrusion.

[0017] Compared with conventional designs, the folding wheelchair provided in the embodiments of the present application has the following advantages.

[0018] In the folding wheelchair according to an embodiment of the present application, a pivot point between the backrest bracket and the seat bracket is positioned above the center plane of the seat bracket, providing a large folding space between the backrest bracket and the seat bracket. Therefore, when folding the folding wheelchair, there is no interference between the backrest bracket and the seat bracket, and it is not necessary to remove the backrest cushion mounted on the backrest bracket and / or the seat cushion mounted on the seat bracket in advance.

[0019] Compared with the solution in the conventional embodiments in which the backrest bracket and the seat bracket of the folding wheelchair have a hinge point arranged therebetween, which is located below the center plane of the seat bracket, whereby it is necessary to remove the seat cushion and / or the backrest cushion of the folding wheelchair in advance, in the folding wheelchair in the embodiment of the present application, there is no need to remove the backrest cushion and / or the seat cushion in advance at the time of folding, thereby simplifying the folding operation and improving the user experience.

[0020] In addition to the technical problems solved by the above-described embodiments of the present application, the technical features constituting the technical solutions, and the advantageous effects achieved by the technical features of these technical solutions, other technical problems that the folding wheelchair according to the disclosed embodiments can solve, other technical features constituting the technical solutions, and the advantageous effects achieved by these technical features will be explained in more detail in the specific embodiments. Short description of the characters Fig. 1 is a schematic diagram of an overall structure of the folding wheelchair provided by an embodiment of the present application. Fig. 2 is a schematic diagram of an unfolded state of the folding wheelchair provided by an embodiment of the present application. Fig. 3 is a schematic diagram of a folded state of the folding wheelchair provided by an embodiment of the present application. Fig. 4 is a schematic exploded view of the folding wheelchair provided by an embodiment of the present application. Fig. 5 is a schematic structural diagram of the folding wheelchair in an unfolded state provided by an embodiment of the present application. Fig. 6 is a schematic positional representation of a hinge point g provided by an embodiment of the present application. Fig. 7 is a schematic structural diagram of the folding wheelchair in a folded state provided by an embodiment of the present application. Fig. Figure 8 is a schematic diagram of the arrangement of the locking hook mechanism and the locking structure provided by an embodiment of the present application. Fig. 9 is a schematic diagram illustrating the connection between the link rod and the locking hook in the locking hook mechanism provided by an embodiment of the present application. Fig. 10 is an enlarged schematic representation of a view at position A in Fig. 8 from one perspective. Fig. 11 is an enlarged schematic representation of a view at position A in Fig. 8 from a different perspective. List of reference symbols 10 Front support frame 11 Front wheel 20 Backrest bracket 21 First locking surface 22 First fastening section 23 Second fastening section 30 Rear support frame 31 rear wheel 32 Second locking surface 33 locking pin 40 Bracket connecting rod 41 Support wheel 42 Main body section 43 extension section 50 seat connecting rod 60 seat bracket 70 armrest 80 Footrest 90 locking hook mechanism 91 connecting rod 92 locking hooks 921 wrench 922 limit groove 93 torsion spring Detailed description of the embodiments

[0021] As described in the prior art, the conventional designs have the technical problem that when folding the folding wheelchair, it is necessary to remove the backrest cushion and / or the seat cushion, which makes the folding process cumbersome and leads to a poor user experience.According to the inventors' research, the reason for this problem is that the folding wheelchair includes a foldable and deformable first connecting rod mechanism formed by a front support frame, a backrest bracket, a rear support frame, and a bracket connecting rod that are pivotally connected to each other, and a foldable and deformable second connecting rod mechanism formed by the front support frame, a seat connecting rod, a seat bracket, and the backrest bracket; when the first connecting rod mechanism moves, the second connecting rod mechanism can move accordingly, thereby realizing that the seat bracket can be folded accordingly during the folding and unfolding process of the folding wheelchair.

[0022] However, a pivot point formed by the above-mentioned seat bracket and backrest bracket is located below the seat bracket, and the folding space between the backrest bracket and the seat bracket is relatively small. If the backrest cushion and / or seat cushion mounted on the backrest bracket are not removed in advance, the backrest bracket and seat bracket will interfere with the folding process, preventing the folding wheelchair from folding. Therefore, it is necessary to remove the backrest cushion and / or seat cushion before folding the folding wheelchair.

[0023] In response to the above-mentioned technical problems, the embodiment of the present invention provides a folding wheelchair. The hinge point between the backrest bracket and the seat bracket is positioned above the center plane of the seat bracket, so the folding space between the backrest bracket and the seat bracket is relatively large. Therefore, when folding the folding wheelchair, there is no interference between the backrest bracket and the seat bracket, and it is not necessary to remove the backrest cushion attached to the backrest bracket and / or the seat cushion attached to the seat bracket in advance. This simplifies the folding process and improves the user experience.

[0024] In order to make the above-mentioned objects, features, and advantages of the embodiments of the present application more apparent and understandable, a clear and complete description of the technical solution in the embodiments of the present application is given below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments that can be obtained by those skilled in the art without creative effort fall within the scope of the present application.

[0025] For a better understanding of the embodiments of the present application, the lines shown in the schematic representations of the mechanisms involved in the embodiments of the present application are projections of the median plane of each specific structure in the frontal view. The first direction that plays a role in the present application is represented by the Fig. 5. The first direction represents the front-to-back direction of the entire folding wheelchair.

[0026] As in the Fig. 1 to 5, the folding wheelchair provided by an embodiment of the present application includes a front support frame 10, a backrest bracket 20, an armrest 70, front wheels 11, rear wheels 31, a rear support frame 30, a bracket connecting rod 40, a seat bracket 60, a seat connecting rod 50, and a footrest 80; wherein the front support frame 10, the backrest bracket 20, the rear support frame 30, and the bracket connecting rod 40 are hingedly connected to each other and form a first connecting rod mechanism that is foldable and deformable.

[0027] The front support frame 10, the backrest bracket 20, the seat bracket 60, and the seat connecting rod 50 are pivotally connected to each other to form a second connecting rod mechanism that is foldable and deformable, and the second connecting rod mechanism is connected to the first connecting rod mechanism to enable folding or unfolding of the seat bracket 60 during an unfolding or folding operation of the entire folding wheelchair.

[0028] The armrests 70 on both sides of the backrest bracket 20 can rotate relative to the backrest bracket 20. For example, the armrest 70 can be rotatably connected to the backrest bracket 20, or the armrest 70 can be rotatably connected to the front support frame 10, and the front support frame 10 can be rotatably connected to the backrest bracket 20. When folding and unfolding the wheelchair, a user can lift the armrest 70 upward to comfortably sit down; and when the user is sitting in the folding wheelchair, the armrest 70 can provide support to the user to enhance the user experience.

[0029] In particular, the folding wheelchair is typically equipped with a wheel set configured to support the folding wheelchair and drive the movement of the folding wheelchair. The wheel set includes the front wheels 11 and the rear wheels 31, and when the folding wheelchair is in a folded state, the front wheels 11 and the rear wheels 31 can come into contact with the ground, forming a horizontal support plane. The support plane supports the entire folding wheelchair. The front support frame 10, also referred to as a front wheel bracket, is configured to mount the front wheels 11. The footrest 80 is also attached to the front end of the front support frame 10 to provide foot support for the user. The rear support frame 30, also referred to as a rear wheel bracket, is configured to mount the rear wheels 31.

[0030] As in Fig. 6, the backrest bracket 20 includes a first attachment portion 22 and a second attachment portion 23, wherein the first attachment portion 22 is configured to attach a backrest cushion of the folding wheelchair. The second attachment portion 23 is configured to be connected to the front support frame 10, the seat bracket 60, and the rear support frame 30, and an end of the front support frame 10 located remote from the front wheels 11 and an end of the rear support frame 30 located remote from the rear wheels 31 are each rotatably connected to the second attachment portion 23 of the backrest bracket 20 and can rotate relative to the backrest bracket 20.

[0031] The bracket connecting rod 40 is arranged between the rear support frame 30 and the front support frame 10. The two ends of the bracket connecting rod 40 are pivotally connected to the rear support frame 30 and the front support frame 10, respectively. That is, the front support frame 10, the backrest bracket 20, the rear support frame 30, and the bracket connecting rod 40 are pivotally connected to each other to form pivot points a, b, c, and d, thus forming a first connecting rod mechanism that is foldable and deformable to enable the folding of the front support frame 10, the rear support frame 30, and the backrest bracket 20 of the folding wheelchair.When the folding wheelchair is in an unfolded state, the backrest bracket 20 and the rear support frame 30 are mutually limited and supported, thereby forming a stable triangular structure of the hinge points a, c and d.

[0032] The above-mentioned seat connecting rod 50 is configured to connect the seat bracket 60 and the front support frame 10. One end of the seat connecting rod 50 is pivotally connected to the seat bracket 60, and the other end of the seat connecting rod 50 is pivotally connected to the front support frame 10. That is, the front support frame 10, the seat connecting rod 50, the seat bracket 60, and the backrest bracket 20 are pivotally connected to each other to form pivot points e, f, g, and a, thus forming a second connecting rod mechanism that is foldable and deformable to allow the seat bracket 60 to fold along with the folding and unfolding process of the entire folding wheelchair.

[0033] Furthermore, in one embodiment of the present application, the hinge point g formed by the backrest bracket 20 and the seat bracket 60 is arranged above a center plane of the seat bracket 60. This arrangement allows for a relatively large folding space between the backrest bracket 20 and the seat bracket 60. Therefore, when folding the folding wheelchair, there is no interference between the backrest bracket 20 and the seat bracket 60, and it is not necessary to remove the backrest cushion mounted on the backrest bracket 20 and / or the seat cushion mounted on the seat bracket 60 in advance.

[0034] Compared with the prior art solution in which the backrest bracket and the seat bracket have a hinge point formed therebetween, which is located below the center plane of the seat bracket, resulting in the need to remove the seat cushion and / or the backrest cushion of the folding wheelchair in advance at the time of folding, in the folding wheelchair in the embodiment of the present application, there is no need to disassemble the backrest cushion and / or the seat cushion in advance at the time of folding, thereby simplifying the folding operation and improving the user experience.

[0035] As in the Fig. 5 to 7, according to the above embodiments, the front support frame 10, the backrest bracket 20, the rear support frame 30 and the bracket connecting rod 40 of the above-mentioned first connecting rod mechanism are sequentially pivotally connected to form the pivot points a, b, c and d.

[0036] Specifically, in the first connecting rod mechanism, the end of the front support frame 10 remote from the front wheels 11 is pivotally connected to the second attachment portion 23 of the backrest bracket 20 to form the pivot point a, and the second attachment portion 23 of the backrest bracket 20 is pivotally connected to the end of the rear support frame 30 remote from the rear wheels 31 to form the pivot point b; the two ends of the bracket connecting rod 40 are respectively pivotally connected to the rear support frame 30 and the front support frame 10 to form the pivot points c and d, and a distance relationship between the respective pivot points a, b, c, and d satisfies the condition ab: bc: cd: da = 1: 1.1~1.2: 2.4~3: 2.4~2.8. Preferably, the distance relationship between the respective joint points a, b, c and d satisfies the condition ab: bc : cd : da = 1 : 1.2 : 2.75 : 2.7.

[0037] In the second connecting rod mechanism, the front support frame 10, the seat connecting rod 50, the seat bracket 60, and the backrest bracket 20 are sequentially connected to form the hinge points e, f, g, and a, and the hinge point g is located above the center plane of the seat bracket 60.

[0038] Specifically, in the second connecting rod mechanism, the seat connecting rod 50 is configured to connect the front support frame 10 and the seat bracket 60. One end of the seat connecting rod 50 is pivotally connected to the front support frame 10 to form the pivot point e, and the other end of the seat connecting rod 50 is pivotally connected to the seat bracket 60 to form the pivot point f. One end of the seat bracket 60 remote from the pivot point f is pivotally connected to the second attachment portion 23 of the backrest bracket 20 to form the pivot point g, wherein the pivot point g is located above the center plane of the seat bracket 60; and the second attachment portion 23 of the backrest bracket 20 is also pivotally connected to the front support frame 10 to form the pivot point a.Furthermore, a distance relationship between the above-mentioned respective joint points e, f, g, and a satisfies the condition ef: fg: ga: ae = 1~1.8: 2.8~4.8: 1: 2.2-3.2. Preferably, the distance relationship between the above-mentioned respective joint points e, f, g, and a satisfies the condition ef: fg: ga: ae = 1.65: 4.7: 1: 3.1.

[0039] With this arrangement, the pivot points in the first and second connecting rod mechanisms mentioned above in the embodiments of the present application satisfy the above-mentioned pitch relationship, thereby not only realizing the folding of the seat bracket 60 during the folding and unfolding operation of the entire folding wheelchair when the first connecting rod mechanism moves, but also allowing the backrest bracket 20 to rotate to a horizontal state in the folded state of the folding wheelchair and remain parallel to the support plane supporting the folding wheelchair. Therefore, the folded folding wheelchair is completely in a horizontal state and is relatively flat, so that the folded folding wheelchair is stable in terms of its center of gravity and does not tip easily, thereby improving the user experience.

[0040] Below with reference to Fig. 6, the vertical distance of the hinge point g to the center plane of the seat bracket 60 is X, and the vertical distance of the hinge point g to the center plane of the first attachment portion 22 is Y, and X and Y satisfy the condition of 60 mm ≤ x + y ≤ 110 mm. For example, a value range of X is 10 mm ≤ X ≤ 50 mm, and a value range of Y is 50 mm ≤ Y ≤ 60 mm. With such an arrangement, in the embodiment of the present application, when the folding wheelchair is in the folded state, the backrest bracket 20 and the seat bracket 60 can accommodate the seat cushion and the backrest cushion, thereby avoiding collision between the backrest bracket 20 and the seat bracket 60 during the folding operation. When folding the folding wheelchair, it is not necessary to detach the seat cushion before folding, which improves the user experience.

[0041] In some embodiments, the seat support 60 is inclined relative to the support plane as a whole. A first end of the seat support 60 is a free end, and a second end of the seat support 60 is pivotally connected to the second attachment portion 23 of the backrest support 20 to form the pivot point g, and the pivot point g is arranged above the center plane of the seat support 60. The rearward inclination angle of the first attachment portion 22 of the backrest support 20 is α, and the value range for α is between 5° and 20°. The second end of the seat support 60 is directed obliquely upward relative to a horizontal support plane, and the elevation angle formed is β, and the value range for β is between 2° and 8°.

[0042] When folding the folding wheelchair, the backrest bracket 20 rotates counterclockwise, and then the seat bracket 60 can follow suit, also rotating counterclockwise. When the backrest bracket 20 rotates 90° + α° counterclockwise, the seat bracket 60 can rotate counterclockwise by an angle β, and the center plane of the seat bracket 60 is parallel to the horizontal support plane. That is, the center plane of the seat bracket 60 can be parallel to the center plane of the backrest bracket 20, both of which are in a horizontal state.

[0043] For example, in the present embodiment, the inclination angle of the first attachment portion 22 of the backrest bracket 20 is 16°, and the elevation angle of the seat bracket 60 relative to the support plane is 4°. Then, when the backrest bracket 20 rotates 106° counterclockwise, the seat bracket 60 can rotate 4° counterclockwise, and the center plane of the seat bracket 60 can be parallel to the center plane of the backrest bracket 20, both of which are parallel to the horizontal support plane. With this arrangement, the backrest bracket 20 can be closely fitted to the seat bracket 60, thereby making a folding wheelchair as a whole flatter when folded, more stable in its center of gravity, and less prone to tipping, thus improving the user experience.

[0044] As in Fig. 6 in combination with Fig. 4, the wheel set of the folding wheelchair in the embodiment of the present application includes not only front wheels 11 and rear wheels 31, but also a support wheel 41 attached to the support connecting rod 40.

[0045] Specifically, the bracket connecting rod 40 is disposed between the front support frame 10 and the rear support frame 30, and the bracket connecting rod 40 includes a main body portion 42 and an extension portion 43. The main body portion 42 is disposed between the front support frame 10 and the rear support frame 30, and the main body portion 42 is pivotally connected to the front support frame 10 to form the pivot point d, and the main body portion 42 is pivotally connected to the rear support frame 30 to form the pivot point c.

[0046] The extension portion 43 and the main body portion 42 form a one-piece structure, and the angle between the extension portion 43 and the main body portion 42 is an obtuse angle. The extension portion 43 is disposed on an outer side of the rear support frame 30 and extends diagonally downward along the rear support frame 30. One end of the extension portion 43 extends to the pivot point c, the other end of the extension portion 43 is configured to attach the support wheel 41, and the support wheel 41 can rotate relative to the bracket connecting rod 40.With this arrangement, when the folding wheelchair is in the folded state, the support wheel 41 can come into contact with the ground, so that the rear wheels 31, the support wheel 41 and the ground form a stable support plane, thereby improving the stability of the folding wheelchair in the folded state and preventing tipping over.

[0047] Furthermore, the angle between the main body portion 42 and the extension portion 43 is formed obtuse (>90°). In the folded state, the support wheel 41 is arranged near a rear portion of a wheelchair body (thereby limiting a marginal distance between an end point of the extension portion 43 and the rear portion of the wheelchair body), whereby the wheelchair can be conveniently pulled in the folded state, and a pulling handle is arranged on the front wheel bracket or the footrest. At the same time, the folding wheelchair can be placed upright by using a structure near the pivot point b and the support wheel 41 as a support plane.

[0048] As in the Fig. 8 to 11, and with reference to Fig.5, based on the above embodiments, in the folding wheelchair provided by an embodiment of the present application, the backrest bracket 20 and the rear support frame 30 have a locking structure. When the folding wheelchair is in the unfolded state, the backrest bracket 20 and the rear support frame 30 are mutually restrained and supported by the locking structure, thereby forming a stable triangular structure of the hinge points a, c, and d.

[0049] Specifically, the locking structure is formed between the backrest bracket 20 and the rear support frame 30. The locking structure includes a first locking surface 21 and a second locking surface 32. A position of the backrest bracket 20 near the rear support frame 30 is provided with a concavity to form the first locking surface 21, that is, the surface on which the concavity is formed forms the first locking surface 21. One end of the rear support frame 30 near the backrest bracket 20 is provided with a protrusion aligned with the recess and has a second locking surface 32 aligned with the first locking surface 21.During the unfolding process of the folding wheelchair, when the backrest bracket 20 rotates in place, the protrusion can be embedded in the recess and the first locking surface 21 abuts and fits snugly against the second locking surface 32, thereby achieving positional limitation and support between the backrest bracket 20 and the rear support frame 30, and preventing the backrest bracket 20 and the rear support frame 30 from rotating about the pivot point b in a face-to-face direction.

[0050] To improve the stability of the unfolded state of the folding wheelchair, the folding wheelchair provided in one embodiment of the present application further includes a locking hook mechanism 90 including a link rod 91 and at least one locking hook 92. The link rod 91 passes through a lower part of the seat bracket 60, and one end of the link rod 91 is fixed to a locking hook 92 rotatably connected to the backrest bracket 20.

[0051] The rear support frame 30 is provided with a retaining pin 33 that is configured to mate with the locking hook 92. The locking hook 92 has a limiting groove 922 that is configured to mate with the retaining pin 33. This limiting groove 922 can be engaged with the retaining pin 33. Also arranged between the rear support frame 30 and the locking hook 92 is a torsion spring 93 that is configured to exert a locking force on the locking hook 92 to hold the locking hook 92 to the backrest bracket 20.

[0052] When the folding wheelchair is unfolded, a back side of the locking hook 92 first comes into contact with the locking pin 33, and under a pressure of the rear support frame 30, the locking hook 92 can overcome the locking force of the torsion spring 93 and rotate clockwise, so that the locking pin 33 can be caught in the restricting groove 922; at this time, the locking hook 92 rotates counterclockwise and is restored by the action of the torsion spring 93, and the bottom side of the locking hook 92 abuts against the restricting projection of the backrest bracket 20, thereby restricting the backrest bracket 20 and the rear support frame 30 so as to prevent the backrest bracket 20 and the rear support frame 30 from separating from each other around the hinge point b.At the same time, the backrest bracket and the rear support frame 30 are restrained and supported by the locking structure, preventing the backrest bracket 20 and the rear support frame 30 from rotating about the pivot point b in the face-to-face direction. As a result, the backrest bracket 20 and the rear support frame 30 are fully braced against each other. A stable triangular structure with the pivot points a, c, and d is formed in the first connecting rod mechanism.

[0053] For illustrative purposes, the locking hook mechanism 90 provided by an embodiment of the present application includes a first locking hook and a second locking hook. The first locking hook and the second locking hook are symmetrically arranged at both ends of the link rod 91, and the first locking hook and the second locking hook are symmetrical components. The specific structure of the first locking hook will be described using the first locking hook as an example.

[0054] The first locking hook includes a wrench 921 configured to apply pressure to the first locking hook to overcome a torsional force of the torsion spring 93, causing the first locking hook to rotate relative to the backrest bracket 20. For example, when the wrench 921 is pushed downward to rotate the first locking hook clockwise, the first locking hook disengages from the retaining pin 33, thereby releasing the position limit between the rear support frame 30 and the backrest bracket 20 to fold the folding wheelchair.

[0055] A position of the backrest bracket 20 near the first locking hook is provided with a positioning protrusion that can abut against a lower part of the wrench 921. The torsion spring 93 provides an outward supporting force to allow the first locking hook to rotate counterclockwise. When the lower part of the wrench 921 abuts the positioning protrusion, the first locking hook rotates in place, and the limiting groove 922 of the first locking hook engages the retaining pin 33 to complete the locking of the backrest bracket 20 and the rear wheel bracket.

[0056] Note that, as mentioned above, the first and second locking hooks can rotate synchronously. When the user operates the wrench 921 of one of the locking hooks 92, the locking and unlocking between the backrest bracket 20 and the rear support frame 30 can be completed, which can improve the user experience.

[0057] Each embodiment or implementation in this specification is described step by step, and each embodiment focuses on the differences from other embodiments so that cross-references for the same or similar parts can be made between the embodiments.

[0058] It should be noted that while the embodiments referred to in the specification as "one embodiment," "an embodiment," "exemplary embodiment," and "some embodiments" may include specific features, structures, or characteristics, not every embodiment necessarily includes such specific features, structures, or characteristics. Furthermore, such language does not necessarily refer to the same embodiment. In addition, when a particular feature, structure, or feature is described in connection with one embodiment, it is within the skill of those skilled in the art to implement that feature, structure, or feature in connection with other embodiments, whether explicitly described or not explicitly described.

[0059] In general, terms should be understood at least in part by their contextual usage. For example, the term "one or more" as used herein may be used to describe a single feature, structure, or characteristic, or to describe a combination of multiple features, structures, or characteristics, depending on the context. Likewise, the term "a" or "an" may be understood to convey singular or plural usage, depending on the context.

[0060] It should be readily understood that "on ...", "over ...", and "under ..." in the present specification should be interpreted as broadly as possible, so that "on ..." means not only "directly on something" but also "on something" with an intervening feature or layer, and "over ..." means not only "over something" but also "over something" without an intervening feature or layer (i.e., directly on something).

[0061] Finally, it should be explained that the above embodiments are only illustrative of the technical solution of the present application, not limiting it. Although the present application has been described in detail with reference to the above embodiments, it should be clear to those skilled in the art that the technical solution described in the above embodiments may still be modified, or some or all of its technical features may be replaced with equivalent ones. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present application.

Claims

[1] Folding wheelchair, characterized by that it has a front support frame (10), a backrest bracket (20), a rear support frame (30), a bracket connecting rod (40), a seat bracket (60), a seat connecting rod (50) and an armrest (70); wherein the front support frame (10), the backrest bracket (20), the rear support frame (30), and the bracket connecting rod (40) are pivotally connected to one another to form a first connecting rod mechanism; the seat connecting rod (50) is pivotally connected to the front support frame (10) and the seat bracket (60), respectively; and the front support frame (10), the backrest bracket (20), the seat bracket (60), and the seat connecting rod (50) form a second connecting rod mechanism; wherein the armrest (70) is arranged on both sides of the backrest support (20) and the armrest (70), the front support frame (10), the rear support frame (30) and the backrest support (20) converge on both sides of the seat support (60). [2] A folding wheelchair according to claim 1, characterized by that the armrest (70) is rotatably connected to the backrest bracket (20). [3] A folding wheelchair according to claim 1, characterized by that the armrest (70) is rotatably connected to the front support frame (10) and the front support frame (10) is rotatably connected to the backrest bracket (20). [4] A folding wheelchair according to any one of claims 1 to 3, characterized bythat a locking structure is formed between the backrest bracket (20) and the rear support frame (30) and when the folding wheelchair is in an unfolded state, the backrest bracket (20) and the rear support frame (30) are mutually limited and supported by the locking structure. [5] A folding wheelchair according to claim 4, characterized by that the locking structure has a first locking surface (21) and a second locking surface (32), and the first locking surface (21) abuts and engages the second locking surface (32) during an unfolding operation of the folding wheelchair. [6] A folding wheelchair according to claim 5, characterized bythat the first locking surface (21) is arranged at a position of the backrest bracket (20) near the rear support frame (30) and is formed as a concavity, the second locking surface (32) is arranged at one end of the rear support frame (30) near the backrest bracket (20) and is formed as a projection, and the projection is embedded in the concavity during the unfolding process of the folding wheelchair. [7] A folding wheelchair according to any one of claims 1 to 6, characterized byin that the backrest bracket (20) has a first fastening portion (22) and a second fastening portion (23), and the first fastening portion (22) is designed to fasten a backrest cushion of the folding wheelchair, and the second fastening portion (23) is designed to connect to the front support frame (10), the seat bracket (60) and the rear support frame (30). [8] A folding wheelchair according to claim 7, characterized bythat the front support frame (10), the backrest bracket (20), the rear support frame (30) and the bracket connecting rod (40) of the first connecting rod mechanism are articulated in sequence to form the hinge points a, b, c and d, and when the folding wheelchair is in an unfolded state, the backrest bracket (20) and the rear support frame (30) are mutually limited and supported, thereby forming a triangular structure of the hinge points a, c and d. [9] A folding wheelchair according to claim 8, characterized bythat a wheel set of the foldable wheelchair has a support wheel (41), the support connecting rod (40) has a main body portion (42) and an extension portion (43), the main body portion (42) is arranged between the front support frame (10) and the rear support frame (30), and the main body portion (42) and the front support frame (10) are hingedly connected to one another at the hinge point d, and the main body portion (42) and the rear support frame (30) are hingedly connected to one another at the hinge point c, the extension portion (43) is arranged on an outer side of the rear support frame (30) and extends diagonally downwards along the rear support frame (30), the extension portion (43) and the main body portion (42) forming a one-piece structure, one end of the extension portion (43) extending to the hinge point c,the other end of the extension section (43) is connected to the support wheel (41) and the support wheel (41) is rotatable relative to the support connecting rod (40). [10] A folding wheelchair according to claim 9, characterized by that the folding wheelchair further comprises a pull handle arranged on the front support frame (10) or on a footrest (80), and an angle between the main body portion (42) and the extension portion (43) is an obtuse angle, and the support wheel (41), when the folding wheelchair is in a folded state, is arranged on a rear portion of a wheelchair body of the folding wheelchair to enable pulling of the folding wheelchair by pulling the pull handle. [11] A folding wheelchair according to claim 9, characterized byin that the wheel set of the folding wheelchair further comprises front wheels (11) and rear wheels (31), the front wheels (11) being attached to the front support frame (10) and the rear wheels (31) being attached to the rear support frame (30); the second attachment portion (23) and an end of the rear support frame (30) remote from the rear wheels (31) are hingedly connected at the hinge point b, and when the folding wheelchair is in a folded state, the hinge point b forms a support plane with one end of the support wheel (41) to enable the folding wheelchair to be placed upright on a floor. [12] A folding wheelchair according to claim 11, characterized bythat when the folding wheelchair is in a folded state, the front wheels (11), the rear wheels (31) and the support wheel (41) further form a further support plane to enable the folding wheelchair to be placed stably on the ground. [13] A folding wheelchair according to any one of claims 1 to 12, characterized by that the front support frame (10) is a U-shaped component.

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