Folding wheelchair

Abstract

The present application provides a folding wheelchair, which relates to the technical field of medical devices and is used to solve the technical problem that during the folding and unfolding process of the existing folding wheelchair, the armrests cannot be linked, resulting in a complex folding and unfolding process. The folding wheelchair includes a front support frame, a backrest support frame, and armrests; the armrests and the front support frame are rotatable relative to the backrest support frame, and the armrests are provided with a first limiting portion and a second limiting portion; the backrest support frame is provided with a first limiting structure, and the front support frame is configured with a second limiting structure; the first limiting structure is configured to be able to abut against and link with the second limiting portion when the folding wheelchair is folded, and to be able to abut against and link with the first limiting portion when the folding wheelchair is unfolded. When the folding wheelchair provided by the present application is folded and unfolded, the armrests and the backrest support frame can be linked, and there is no need to pre-fold or unfold the armrests in advance, thereby simplifying the folding process and improving the user experience.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and more specifically, to a folding wheelchair. Background Art

[0002] A folding wheelchair is a means of transportation for special groups such as the disabled, the elderly and infirm, and medical clinical rehabilitation patients. Since it can be folded, it is convenient to carry and occupies a small space, so it is widely used.

[0003] The existing folding wheelchair includes a backrest bracket and two armrests. The two armrests are respectively hinged on both sides of the backrest bracket, and the armrests can rotate relative to the backrest bracket. When a user sits on the folding wheelchair, the armrests can be lifted upward to facilitate the user's sitting.

[0004] However, during the folding and unfolding process of the above folding wheelchair, the armrests cannot be linked, and the armrests need to be folded or unfolded in advance, resulting in a complicated folding and unfolding process, thus affecting the user experience. Summary of the Invention

[0005] The purpose of the present application is to provide a folding wheelchair. When the folding wheelchair is folded, the armrests are linked with the backrest bracket, and there is no need to pre-fold the armrests, so as to simplify the folding process of the entire folding wheelchair and improve the user experience.

[0006] In order to achieve the above purpose, the embodiments of the present application provide the following technical solutions:

[0007] A folding wheelchair provided by an embodiment of the present application includes a front support frame, a backrest bracket and armrests; the armrests and the front support frame are rotatable relative to the backrest bracket, and the armrests are provided with a first limiting portion and a second limiting portion; the backrest bracket is provided with a first limiting structure, and the front support frame is configured with a second limiting structure; the first limiting structure is configured to be able to abut against and link with the second limiting portion when the folding wheelchair is folded; and when the folding wheelchair is unfolded, it is able to abut against and link with the first limiting portion; when the folding wheelchair is in the unfolded state, the first limiting structure abuts against the first limiting portion; when the folding wheelchair is in the folded state, the second limiting portion is restricted between the second limiting structure and the first limiting structure and abuts against both of them respectively.

[0008] In a possible implementation manner, the armrests are provided with a first limiting protrusion and a second limiting protrusion at intervals to form the first limiting portion and the second limiting portion; both the first limiting protrusion and the second limiting protrusion are located on the side of the armrest facing the backrest bracket and can abut against the first limiting structure.

[0009] In a possible implementation, the armrest and the front support frame are jointly rotatably connected to the backrest support frame; the rotation axis of the armrest, the rotation axis of the front support frame, and the rotation axis of the backrest support frame are located on the same straight line.

[0010] In a possible implementation, the first limiting protrusion and the second limiting protrusion are circumferentially arranged at intervals along the rotation axis of the armrest; the first limiting structure includes a third limiting protrusion, and the third limiting protrusion is located between the first limiting protrusion and the second limiting protrusion; the third limiting protrusion is configured such that when the folding wheelchair is in the unfolded state, the third limiting protrusion abuts against the first limiting protrusion, and when the folding wheelchair is in the folded state, the third limiting protrusion abuts against the second limiting protrusion.

[0011] In a possible implementation, the armrest is integrally L-shaped and includes a carrying handle and a mounting handle, where the carrying handle is configured to provide support for the user, and the mounting handle is used to rotatably connect the armrest to the backrest support frame; a first limiting block and a second limiting block are respectively arranged near the rotation connection of the mounting handle to respectively form the first limiting protrusion and the second limiting protrusion;

[0012] A third limiting block is arranged near the rotation connection of the backrest support frame to form the third limiting protrusion.

[0013] In a possible implementation, the armrest is rotatably connected to the front support frame to form a first rotation axis; the front support frame is rotatably connected to the backrest support frame to form a second rotation axis, and the second rotation axis and the first rotation axis are not collinear.

[0014] In a possible implementation, a rotating shaft block is fixedly arranged on the front support frame, and the armrest is provided with a first rotating shaft hole that cooperates with the rotating shaft block; the armrest is sleeved on the rotating shaft block through the first rotating shaft hole and rotates relative to the front support frame; the rotating shaft block is provided with an eccentric second rotating shaft hole, and the backrest support frame is provided with a rotating shaft that cooperates with the second rotating shaft hole; the front support frame is sleeved on the rotating shaft through the second rotating shaft hole and rotates relative to the backrest support frame.

[0015] In a possible implementation, the first limiting structure includes a fourth limiting protrusion and a fifth limiting protrusion that are arranged at intervals; the fourth limiting protrusion is configured such that when the folding wheelchair is in the unfolded state, the fourth limiting protrusion abuts against the first limiting protrusion; the fifth limiting protrusion is configured such that when the folding wheelchair is in the folded state, the fifth limiting protrusion abuts against the second limiting protrusion.

[0016] In a possible implementation, the fourth limiting protrusion or the first limiting protrusion is provided with a rounded corner structure facing each other; the fifth limiting protrusion or the second limiting protrusion is provided with an arc surface facing each other.

[0017] In a possible implementation, the fourth limiting protrusion is a fourth limiting block provided on the backrest bracket, and the edge of the fourth limiting block facing the first limiting protrusion is provided with a rounded corner structure; the fifth limiting protrusion is a cylinder provided on the backrest bracket, and when the cylinder abuts against the second limiting protrusion, it can slide on the limiting surface of the second limiting protrusion.

[0018] In a possible implementation, the second limiting structure is a limiting surface provided by the front support frame facing the backrest bracket; the limiting surface is configured such that when the folding wheelchair is in a folded state, the limiting surface of the front support frame abuts against the second limiting protrusion.

[0019] In a possible implementation, the folding wheelchair further includes a rear support frame, a support link, a seat bracket, and a seat link; the rear support frame is hinged to the backrest bracket, the support link is provided between the rear support frame and the front support frame, and both ends of the support link are respectively hinged to the rear support frame and the front support frame; the seat link is provided between the seat bracket and the front support frame, one end of the seat link is hinged to the seat bracket, and the other end of the seat link is connected to the front support frame.

[0020] In a possible implementation, the backrest bracket and the rear support frame have a locking structure; the limiting structure includes a first locking surface and a second locking surface, the backrest bracket is provided with a recess to form the first locking surface; a protrusion is provided at one end of the rear support frame close to the backrest bracket to form the second locking surface, the protrusion can be received in the recess, and the first locking surface abuts against the second locking surface.

[0021] In a possible implementation, the folding wheelchair further includes a hook locking mechanism; the hook locking mechanism includes a linkage rod and at least one hook, the hook is provided at the end of the linkage rod; the hook is rotatably connected to the backrest bracket, and a torsion spring is provided therebetween, the torsion spring is used to provide a locking force to the hook; the rear support frame is provided with a fixing pin cooperating with the hook, the hook is provided with a limiting groove cooperating with the fixing pin, and the hook is engaged with the fixing pin through the limiting groove.

[0022] In a possible implementation, the locking hook mechanism includes two locking hooks, which are symmetrically arranged at both ends of the linkage rod; the locking hook is provided with a wrench, and the backrest bracket is provided with a positioning protrusion, and the wrench is configured so that when it abuts against the positioning protrusion, the limiting groove of the locking hook is engaged with the fixing pin.

[0023] In a possible implementation, the folding wheelchair further includes a front wheel and a rear wheel; the front wheel is mounted on an end of the front support frame away from the backrest frame, and the rear wheel is mounted on an end of the rear support frame away from the backrest frame.

[0024] Compared with the related art, the folding wheelchair provided in the embodiment of the present application has the following advantages:

[0025] The folding wheelchair provided in the embodiment of the present application comprises a front support frame and an armrest which are respectively rotated relative to a backrest frame, wherein the armrest has a first limiting portion and a second limiting portion, and the backrest frame is provided with a first limiting structure for abutting against the first limiting portion and the second limiting portion, and during the folding process of the folding wheelchair, the backrest frame abuts against the second limiting portion through the first limiting structure to realize linkage between the two, and during the unfolding process of the folding wheelchair, the backrest frame abuts against the first limiting portion through the first limiting structure to realize linkage between the two.

[0026] Furthermore, when the folding wheelchair is in a folded state, the second limiting portion can be limited between the first limiting structure and the second limiting structure, thereby limiting the armrest between the backrest bracket and the front support frame, which can prevent the armrest from shaking and improve the stability of the folding wheelchair in the folded state.

[0027] Compared with the related technical solutions, in the process of folding and unfolding the folding wheelchair, the armrests cannot participate in the linkage, and the armrests need to be folded in advance, resulting in a complicated folding and unfolding process. When the folding wheelchair provided in the embodiment of the present application is folded and unfolded, the armrests and the backrest brackets can be linked, and there is no need to fold or unfold the armrests in advance, thereby simplifying the folding process and improving the user experience.

[0028] In addition to the technical problems solved by the embodiments of the present disclosure, the technical features that constitute the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that can be solved by the folding wheelchair provided by the embodiments of the present application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of the overall structure of a foldable wheelchair provided in an embodiment of the present application;

[0030] Figure 2Schematic diagram of the unfolded state of the folding wheelchair provided by the embodiment of the present application;

[0031] Figure 3 Schematic diagram of the folded state of the folding wheelchair provided by the embodiment of the present application;

[0032] Figure 4 Exploded view of the folding wheelchair provided by the embodiment of the present application;

[0033] Figure 5 Schematic diagram of the mechanism principle of the folding wheelchair provided by the embodiment of the present application;

[0034] Figure 6 Schematic diagram of the arrangement of the armrest and its first limiting protrusion and second limiting protrusion provided by the embodiment of the present application;

[0035] Figure 7 Schematic diagram of the first limiting structure provided on the backrest bracket according to the embodiment of the present application;

[0036] Figure 8 For Figure 7 Enlarged view at position A in

[0037] Figures 9 to 12 Schematic diagram of the state during the folding and unfolding process of the folding wheelchair in an embodiment of the present application;

[0038] Figure 13 Schematic diagram of the connection of the armrest, backrest bracket and front wheel bracket provided by another embodiment of the present application;

[0039] Figures 14 to 17 Schematic diagram of the state during the folding and unfolding process of the folding wheelchair in another embodiment of the present application;

[0040] Figure 18 Schematic diagram of the arrangement of the locking hook mechanism and the locking structure provided by the embodiment of the present application;

[0041] Figure 19 Schematic diagram of the connection between the linkage rod and the locking hook in the locking hook mechanism provided by the embodiment of the present application;

[0042] Figure 20 For Figure 18 Enlarged view at a certain angle at position B in

[0043] Figure 21 For Figure 18 Another enlarged view at position B at another angle.

[0044] Reference numerals:

[0045] 10 - Front support frame;

[0046] 11 - Front wheel; 12 - Second limiting structure; 13 - Rotating shaft block; 131 - Second rotating shaft hole;

[0047] 20 - Backrest support;

[0048] 21 - First locking surface; 22 - Third limiting protrusion; 23 - Fourth limiting protrusion; 24 - Fifth limiting protrusion; 25 - Rotating shaft;

[0049] 30 - Rear support frame;

[0050] 31 - Rear wheel; 32 - Second locking surface; 33 - Fixed pin;

[0051] 40 - Bracket link;

[0052] 50 - Seat link;

[0053] 60 - Seat support;

[0054] 70 - Armrest; 71 - Carrying handle; 72 - Mounting handle; 73 - First limiting protrusion; 74 - Second limiting protrusion; 75 - First rotating shaft hole; 76 - Locking gasket;

[0055] 80 - Footrest;

[0056] 90 - Hook locking mechanism;

[0057] 91 - Linkage rod; 92 - Hook; 921 - Wrench; 922 - Limiting groove; 93 - Torsion spring. Detailed implementation manners

[0058] As described in the background art, the folding wheelchair in the related art has the problems that its folding and unfolding processes are complex, which affects the user experience. After research by the inventor, it is found that the reason for this problem is that the existing folding wheelchair includes a backrest support and two armrests, where the two armrests are respectively hinged on both sides of the backrest support, and the armrests can rotate relative to the backrest support. When the user is sitting on the folding wheelchair, the armrests can be lifted upward to facilitate the user to sit. However, during the folding and unfolding processes of the above-mentioned folding wheelchair, the armrests cannot be linked, and the armrests need to be folded in advance.

[0059] In view of the above technical problems, the embodiment of the present application provides a folding wheelchair, which includes a front support frame and an armrest that rotate relative to the backrest support respectively. The armrest has a first limiting portion and a second limiting portion, and the backrest support is provided with a first limiting structure for abutting against the first limiting portion and the second limiting portion. During the folding process of the folding wheelchair (rotating the backrest support), the backrest support abuts against the second limiting portion through the first limiting structure, so that the two are linked. Conversely, when the folding wheelchair is in the unfolding process, the backrest support abuts against the first limiting portion through the first limiting mechanism and links the two.

[0060] With such a setting, when the folding wheelchair provided by the embodiment of the present application is folded or unfolded, the armrest and the backrest bracket can be linked, and there is no need to pre-fold or unfold the armrest, thereby simplifying the folding and unfolding process and improving the user experience.

[0061] In order to make the above objects, features, and advantages of the embodiments of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0062] As Figures 1 to 5 shown, the folding wheelchair provided by the 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 link 40, a seat bracket 60, a seat link 50, and a footrest 80; wherein, the front support frame 10, the backrest bracket 20, the rear support frame 30, and the bracket link 40 are hinged together to form a first link mechanism that can be folded and deformed.

[0063] The front support frame 10, the backrest bracket 20, the seat bracket 60, and the seat link 50 are hinged together to form a second link mechanism, and the second link mechanism is linked with the first link mechanism to enable the seat bracket 60 to follow and fold or unfold during the unfolding or folding process of the entire folding wheelchair.

[0064] Specifically, the front support frame 10 is used to install the front wheels 11 and is also referred to as the front wheel bracket, and the footrest 80 is also installed at the front end of the front support frame 10 to provide foot support for the user. The rear support frame 30 is used to install the rear wheels 31 and is also referred to as the rear wheel bracket. Among them, the backrest bracket 20 includes a first mounting portion and a second mounting portion, and the first mounting portion is used to mount the backrest pad of the folding wheelchair, and the second mounting portion is used to connect with the front support frame 10, the seat bracket 60, and the rear support frame 30, and one end of the front support frame 10 away from the front wheels 11 and one end of the rear support frame 30 away from the rear wheels 31 can be respectively rotatably connected to the second mounting portion of the backrest bracket 20 and can rotate relative to the backrest bracket 20.

[0065] A bracket link 40 is provided between the rear support bracket 30 and the front support bracket 10. Both ends of the bracket link 40 are hinged to the rear support bracket 30 and the front support bracket 10 respectively. That is, the front support bracket 10, the backrest bracket 20, the rear support bracket 30, and the bracket link 40 are rotatably connected to each other to form pivot points a, b, c, and d, so as to form a first link mechanism that can be folded and deformed, so as to realize the folding of the front support bracket 10, the rear support bracket 30, and the backrest bracket 20 of the folding wheelchair. When the folding wheelchair is in the unfolded state, the backrest bracket 20 and the rear support bracket 30 support each other in a limited position, and then form a stable triangular structure of pivot points a, c, and d.

[0066] The above-mentioned seat link 50 is used to connect the seat bracket 60 and the front support bracket 10. One end of the seat link 50 is hinged to the seat bracket 60, and the other end of the seat link 50 is hinged to the front support bracket 10. That is, the front support bracket 10, the seat link 50, the seat bracket 60, and the backrest bracket 20 are hinged to each other to form pivot points e, f, g, and a, so as to form a second link mechanism that can be folded and deformed, so as to realize the follow-up folding of the seat bracket 60 during the folding and unfolding process of the entire folding wheelchair.

[0067] The folding wheelchair provided by the embodiment of the present application further includes armrests 70 arranged on both sides of the backrest bracket 20, and the armrests 70 can rotate relative to the backrest bracket 20. For example, the armrests 70 can be rotatably connected to the backrest bracket 20, or the armrests 70 can be rotatably connected to the front support bracket 10, and the front support bracket 10 is rotatably connected to the backrest bracket 20. When the user gets on and off the folding wheelchair, the armrests 70 can be lifted upward to facilitate the user to take a seat; and when the user is sitting on the folding wheelchair, the armrests 70 can provide support for the user to improve the use experience.

[0068] Further, the armrest 70 is provided with a first limiting portion and a second limiting portion, and both the first limiting portion and the second limiting portion are located on the inner side surface of the armrest 70 facing the backrest bracket 20; the backrest bracket 20 is provided with a first limiting structure, and the first limiting structure can abut against the first limiting portion and the second limiting portion. It should be noted that the above-mentioned first limiting portion and the second limiting portion can be respectively limiting protrusions or other limiting members formed on the armrest 70; the first limiting structure at least includes one limiting protrusion formed on the backrest bracket 20.

[0069] Exemplarily, the backrest bracket 20 can be provided with one or two limiting protrusions. For example, the armrest 70 is provided with two spaced-apart limiting protrusions, the backrest bracket 20 is provided with one limiting protrusion, and the limiting protrusion on the backrest bracket 20 can be located between the two limiting protrusions of the armrest and on the rotation path formed by the two limiting protrusions of the armrest 70.

[0070] Alternatively, the armrest 70 is provided with two limit protrusions arranged at intervals, and the backrest support 20 is also provided with two limit protrusions. The limit protrusions on the backrest support 20 are not located on the rotation path formed by the two limit protrusions of the armrest. It is only necessary to set the limit protrusions on the armrest 70 in cooperation with the limit protrusions on the backrest support 20 so that the armrest 70 can be linked with the backrest support 20 during the folding and unfolding processes of the folding wheelchair. The embodiments of the present application do not limit this.

[0071] Refer to Figures 9 to 12 , when the backrest support 20 is rotated counterclockwise to fold the folding wheelchair, that is, during the process of the folding wheelchair being converted from the Figure 9 shown unfolded state to the Figure 12 shown folded state, the first limit structure (in the embodiment shown in this drawing, the first limit structure includes a limit protrusion) of the backrest support 20 gradually separates from the first limit part, as Figure 10 shown. When the backrest support 20 is rotated to a certain angle, the first limit structure can abut against the second limit part and drive the armrest 70 to rotate together. That is, during the folding process of the folding wheelchair, the armrest 70 can be linked with the backrest support 20, as Figure 11 shown.

[0072] The front support frame 10 is provided with a second limit structure 12, and the second limit structure 12 is configured to be able to abut against the second limit part when the folding wheelchair is in the folded state. After the first limit structure of the backrest support 20 abuts against the second limit part, if the backrest support 20 continues to rotate counterclockwise, the second limit part can be restricted between the first limit structure and the second limit structure 12, thereby completing the limit of the armrest 70 and preventing the armrest 70 from shaking, so as to improve the stability of the folding wheelchair in the folded state, as Figure 12 shown.

[0073] Conversely, when the above first limit structure unfolds the folding wheelchair, the first limit structure can abut against the first limit part and drive the armrest 70 to be linked.

[0074] Specifically, when the folding wheelchair is unfolded, that is, during the process of the folding wheelchair being converted from the Figure 12 shown folded state to the Figure 9 shown unfolded state. First, the front support frame 10 and the backrest support 20 rotate in opposite directions (clockwise rotation), and the second limit structure 12 of the front support frame 10 gradually moves away from the first limit structure of the backrest support 20. During this process, due to the action of gravity or assembly damping on the armrest 70, there is a counterclockwise rotational force, so the armrest 70 will not rotate clockwise against gravity. At this time, the second limit part of the armrest 70 continues to be in contact with the second limit structure 12 of the front support frame 10.

[0075] As the backrest support 20 continues to rotate clockwise, the first limiting structure can abut against the first limiting portion, thereby realizing the linkage between the armrest 70 and the backrest support 20, driving the armrest 70 to rotate clockwise. When the backrest support 20 rotates in place, the backrest support 20 and the rear support frame 30 are limited and supported by each other at this time, and then a stable triangular structure of the rotation axes a, c, and d is formed.

[0076] At the same time, the armrest 70 also unfolds in place, and the first limiting portion remains in abutment with the first limiting structure, which can prevent the armrest 70 from rotating counterclockwise, that is, prevent the armrest 70 from folding due to external force, thereby improving the support reliability of the armrest 70. It should be noted that the armrest 70 can continue to rotate clockwise so that the armrest 70 can be turned up, which is convenient for the user to lift the armrest 70 upward when folding and unfolding the wheelchair up and down.

[0077] Compared with the related technical solutions, in the process of folding and unfolding the folding wheelchair, the armrest 70 cannot participate in the linkage and needs to be pre-folded, resulting in a complicated folding process. When the folding wheelchair provided by the embodiment of the present application is folded and unfolded, the armrest 70 and the backrest support 20 can be linked, and there is no need to pre-fold or unfold the armrest 70, thereby simplifying the folding process and improving the user experience.

[0078] Furthermore, when the folding wheelchair is in the folded state, the second limiting portion can be limited between the first limiting structure and the second limiting structure 12, thereby limiting the armrest 70 between the backrest support 20 and the front support frame 10, which can prevent the armrest 70 from shaking and improve the stability of the folding wheelchair in the folded state.

[0079] As Figure 6 shown, on the basis of the above embodiment, the armrest 70 in the embodiment of the present application can be provided with a first limiting protrusion 73 and a second limiting protrusion 74 at intervals. The first limiting protrusion 73 and the second limiting protrusion 74 can protrude toward the backrest support 20 from a partial inner side surface of the armrest 70 facing the backrest support 20 to form the first limiting portion and the second limiting portion, that is, the first limiting protrusion 73 and the second limiting protrusion 74 are an integral structure with the armrest 70. Further, when the folding wheelchair is in the folded state, the second limiting protrusion 74 can abut against the first limiting structure, and when the folding wheelchair is in the unfolded state, the first limiting protrusion 73 can abut against the first limiting structure.

[0080] The armrest 70 and the front support frame 10 in the embodiment of the present application can rotate relative to the backrest support 20. According to the rotational connection scheme among the three, the structure of the first limiting structure of the backrest support 20 and the cooperation scheme between the first limiting structure and the first limiting protrusion 73 and the second limiting protrusion 74 of the armrest 70 can be described.

[0081] In one embodiment, the armrest 70 and the front support frame 10 are coaxially rotatably connected to the backrest support frame 20. For example, the armrest 70 and the front support frame 10 are commonly rotatably connected to a rotating shaft, and are rotatably connected to the backrest support frame 20 through this rotating shaft. That is to say, the rotation axes of the armrest 70, the front support frame 10, and the backrest support frame 20 are all on the same straight line.

[0082] On the basis that the armrest 70 and the front support frame 10 are commonly rotatably connected to the backrest support frame 20, the first limiting protrusion 73 and the second limiting protrusion 74 in the armrest 70 of the embodiment of the present application can be circumferentially and spaced apart along the rotation axis of the armrest 70. For example, the armrest 70 is provided with a rotating shaft hole and is sleeved on the rotating shaft through the rotating shaft hole. The first limiting protrusion 73 and the second limiting protrusion 74 can be spaced apart around the circumference of the rotating shaft hole.

[0083] As Figure 7 and Figure 8 shown, the first limiting structure in the embodiment of the present application includes a third limiting protrusion 22. The third limiting protrusion 22 is arranged between the first limiting protrusion 73 and the second limiting protrusion 74 and is located on the rotation path formed by the first limiting protrusion 73 and the second limiting protrusion 74. When the folding wheelchair is folded, the backrest support frame 20 rotates counterclockwise, and the third limiting protrusion 22 can abut against the second limiting protrusion 74 to enable the armrest 70 to be linked with the backrest support frame 20; conversely, when the folding wheelchair is unfolded, the third limiting protrusion 22 can abut against the first limiting protrusion 73 and realize the linkage between the armrest 70 and the backrest support frame 20.

[0084] Further, when the folding wheelchair is in the folded state, the third limiting protrusion 22 abuts against one side of the second limiting protrusion 74, and the other side of the second limiting protrusion 74 abuts against the second limiting structure 12. For example, the second limiting structure 12 can be a limiting surface provided by the front support frame 10 facing the backrest support frame 20, and the limiting surface is configured such that when the folding wheelchair is in the folded state, the limiting surface of the front support frame 10 abuts against the second limiting protrusion 74 to limit the armrest 70 between the front support frame 10 and the backrest support frame 20.

[0085] Exemplarily, the armrest 70 can be integrally in an L-shaped structure, which includes a carrying handle 71 and a mounting handle 72. The carrying handle 71 is used to provide support for the user, and the mounting handle 72 is used to rotatably connect the armrest 70 to the backrest support frame 20. The rotating shaft hole of the armrest 70 is located at one end of the mounting handle 72 away from the carrying handle 71.

[0086] The first limiting block and the second limiting block are respectively arranged at positions of the mounting handle 72 close to the rotating shaft hole. The first limiting block and the second limiting block are arranged at intervals along the circumferential direction of the rotating shaft hole, and form a first limiting protrusion 73 and a second limiting protrusion 74, that is, the first limiting block and the second limiting block are respectively arranged at positions of the mounting handle 72 close to the rotating connection to respectively form the first limiting protrusion 73 and the second limiting protrusion 74.

[0087] It should be noted that the above first limiting block and second limiting block can be separately manufactured from the armrest 70. The first limiting block and the second limiting block are connected to the mounting handle 72 of the armrest 70 to form the first limiting protrusion 73 and the second limiting protrusion 74. Of course, the first limiting block and the second limiting block can also be an integral structure with the armrest 70. The present embodiment does not limit this. Preferably, the above first limiting block and second limiting block can be respectively installed on the mounting handle 72 of the armrest 70.

[0088] Correspondingly, a third limiting block is arranged at a position of the backrest bracket 20 close to the rotating connection, and a third limiting protrusion 22 is formed. When the armrest 70 is rotatably connected to the backrest bracket 20, the third limiting block is located between the first limiting block and the second limiting block, and the third limiting block has limiting surfaces respectively cooperating with the first limiting block and the second limiting block.

[0089] When the armrest 70 and the front support frame 10 are jointly rotatably connected to the backrest bracket 20 and the rotation axes of the three are collinear, the folding and unfolding processes of the folding wheelchair are described as follows:

[0090] When folding the folding wheelchair, that is, the folding wheelchair is converted from the Figure 9 shown unfolded state to the Figure 12 shown folded state. As shown in Figure 9 and Figure 10 When the backrest bracket 20 is rotated counterclockwise, the front support frame 10 follows the movement. The third limiting block of the backrest bracket 20 gradually separates from the first limiting block. At this time, the armrest 70 is in a free state. If the assembly damping of the armrest 70 is small, the armrest 70 can rotate counterclockwise under the action of gravity. If the assembly damping of the armrest 70 is large, it will move together with the front support frame 10.

[0091] As shown in Figure 11 When the backrest bracket 20 is continuously rotated, when the backrest bracket 20 rotates to a certain angle, its third limiting block can abut against the second limiting block and drive the armrest 70 to rotate together. That is, during the folding process of the folding wheelchair, the armrest 70 can be linked with the backrest bracket 20. As shown in Figure 12As shown, when the folding wheelchair is in the folded state, one side of the second limiting block abuts against the third limiting block, and the other side of the second limiting block abuts against the limiting surface of the front support frame 10, so as to limit the armrest 70 between the front support frame 10 and the backrest support frame 20, thereby completing the limiting of the armrest 70 and preventing the armrest 70 from shaking, so as to improve the stability of the folding wheelchair in the folded state.

[0092] Conversely, when the folding wheelchair is unfolded, that is, when the folding wheelchair is Figure 12 converted from the unfolded state shown to Figure 9 the folded state shown. First, after the backrest support frame 20 rotates clockwise by a certain angle, the front support frame 10 rotates clockwise together with the backrest support frame 20, and the limiting surface of the front support frame 10 gradually moves away from the third limiting block of the backrest support frame 20. During this process, due to the action of gravity or assembly damping on the armrest 70, there is a counterclockwise rotational force, so the armrest 70 will not rotate clockwise against gravity. At this time, the second limiting block of the armrest 70 continues to fit with the limiting surface of the front support frame 10.

[0093] As the backrest support frame 20 continues to rotate clockwise, the third limiting block of the backrest support frame 20 can abut against the first limiting block, thereby realizing the linkage between the armrest 70 and the backrest support frame 20, and driving the armrest 70 to rotate clockwise. When the backrest support frame 20 rotates in place, the armrest 70 is also unfolded in place; and the first limiting block and the third limiting block remain in contact, which can prevent the armrest 70 from rotating counterclockwise, that is, prevent the armrest 70 from folding due to external force, thereby improving the support reliability of the armrest 70.

[0094] In another embodiment, the armrest 70 is rotatably connected to the front support frame 10 to form a first rotation axis, and the front support frame 10 is rotatably connected to the backrest support frame 20 to form a second rotation axis, and the second rotation axis and the first rotation axis are not collinear.

[0095] As Figure 13 shown, the front support frame 10 is fixedly provided with a rotating shaft block 13, and the armrest 70 is provided with a first rotating shaft hole 75 that cooperates with the rotating shaft block 13, and the first rotating shaft hole 75 is located on the mounting handle 72 of the armrest 70. The armrest 70 is sleeved on the rotating shaft block 13 through the first rotating shaft hole 75 and locked by a locking gasket 76 to prevent the armrest 70 from falling off the rotating shaft block 13, so as to realize the rotatable connection of the armrest 70 to the front support frame 10.

[0096] The rotating shaft block 13 is provided with an eccentric second rotating shaft hole 131, the backrest bracket 20 is provided with a rotating shaft 25 that cooperates with the second rotating shaft hole 131, and the front support bracket 10 is sleeved on the rotating shaft 25 through the second rotating shaft hole 131, so as to realize the rotation of the front support bracket 10 relative to the backrest bracket 20. It should be noted that the range of the eccentricity between the rotating shaft 25 and the rotating shaft block 13 can be greater than 0 mm and less than or equal to 20 mm, and in order to avoid interference between the rotating shaft 25 and the rotating shaft block 13, the shaft diameter of the rotating shaft block 13 is greater than the shaft diameter of the rotating shaft 25.

[0097] In this embodiment, the first limiting structure includes a fourth limiting protrusion 23 and a fifth limiting protrusion 24 that are spaced apart, and the fourth limiting protrusion 23 and the fifth limiting protrusion 24 can abut against the first limiting protrusion 73 and the second limiting protrusion 74 of the armrest 70 when the folding wheelchair is in the folded and unfolded states.

[0098] Specifically, as Figure 14 shown, the fourth limiting protrusion 23 is configured to abut against the first limiting protrusion 73 when the folding wheelchair is in the unfolded state; the fifth limiting protrusion 24 is configured to abut against the second limiting protrusion 74 when the folding wheelchair is in the folded state, as Figure 16 shown. And, when the folding wheelchair is in the folding process, the fifth limiting protrusion 24 can abut against the second limiting protrusion 74 to enable the armrest 70 and the backrest bracket 20 to be linked, as Figure 15 shown; or when the folding wheelchair is in the unfolded state, the fourth limiting protrusion 23 can abut against the first limiting protrusion 73 to enable the armrest 70 and the backrest bracket 20 to be linked, as Figure 17 shown.

[0099] Furthermore, since the above-mentioned first rotation axis and the second rotation axis are not collinear; therefore, during the linkage process between the backrest bracket 20 and the armrest 70, relative sliding occurs between the limiting block of the backrest bracket 20 and the limiting block of the armrest 70. In order to avoid jamming during the linkage process between the backrest bracket 20 and the armrest 70, the fourth limiting protrusion 23 or the first limiting protrusion 73 is provided with a rounded corner structure facing each other, so that they can slide relative to each other when in the abutting state. Correspondingly, the fifth limiting protrusion 24 or the second limiting protrusion 74 is provided with an arc surface facing each other, so that they can slide relative to each other when in the abutting state.

[0100] Exemplarily, the above-mentioned fourth limiting protrusion 23 may be a fourth limiting block provided on the backrest bracket 20. The fourth limiting block is used to abut against the first limiting block. The fourth limiting block and the first limiting block respectively have a plurality of limiting surfaces, and there are edges between adjacent limiting surfaces. The edge of the fourth limiting block facing the first limiting block is provided with a rounded corner structure so that the fourth limiting block and the first limiting block can abut and slide relative to each other. For example, during the unfolding process of the folding wheelchair, the edge of the lower edge of the fourth limiting block first contacts the limiting surface of the first limiting block, and the edge slides along the limiting surface of the first limiting block until the limiting surface where the edge is located fits with the limiting surface of the first limiting block, thereby realizing the linkage between the armrest 70 and the backrest bracket 20.

[0101] Similarly, the fifth limiting protrusion 24 may be a cylinder provided on the backrest bracket 20. The cylinder is used to abut against the second limiting block. The second limiting block includes a plurality of limiting surfaces, and there are edges between adjacent limiting surfaces. When the cylinder abuts against the limiting surface of the second limiting block, a line contact is formed between the two, which can enable the fifth limiting block and the second limiting block to abut and slide relative to each other. For example, during the folding process, as the backrest bracket 20 rotates counterclockwise, the cylinder starts to contact the second limiting block. When the backrest bracket 20 continues to rotate, the cylinder slides on the limiting surface of the second limiting block until when the armrest 70 is in the folded state, the cylinder still remains in contact with the second limiting block and can enable the second limiting block to abut against the limiting surface of the front support frame 10.

[0102] It should be noted that in the solution where the rotation axes formed by the armrest 70, the front support frame 10 and the backrest bracket 20 are not collinear, the unfolding and folding processes of this folding wheelchair are similar to the coaxial connection solution of the armrest 70, the front support frame 10 and the backrest bracket 20, and will not be elaborated here.

[0103] As Figure 18 、 Figure 20 、 Figure 21 shown, and referring to Figure 5 , on the basis of the above-mentioned embodiments, in the folding wheelchair provided by the embodiments 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 limited and supported by each other through the locking structure, thereby forming a stable triangular structure at the rotation points a, c, and d.

[0104] Specifically, a locking structure is formed between the backrest bracket 20 and the rear support bracket 30. The locking structure includes a first locking surface 21 and a second locking surface 32. A depression is provided at the position of the backrest bracket 20 close to the rear support bracket 30 to form the first locking surface 21, that is, the surface forming the depression forms the first locking surface 21. The end of the rear support bracket 30 close to the backrest bracket 20 has a protrusion, and the protrusion is arranged in cooperation with the depression. The protrusion has a second locking surface 32 that cooperates 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 into the depression, and the first locking surface 21 and the second locking surface 32 are in abutting contact, thereby completing the limit support between the backrest bracket 20 and the rear support bracket 30 and preventing the backrest bracket 20 and the rear support bracket 30 from rotating towards each other around the rotation axis point b.

[0105] As Figures 18 to 21 shown, to improve the stability of the folding wheelchair in the unfolded state, the folding wheelchair provided by the embodiment of the present application further includes a locking hook mechanism 90. The locking hook mechanism 90 includes a linkage rod 91 and at least one locking hook 92. The linkage rod 91 is disposed through the lower part of the seat bracket 60, and a locking hook 92 is fixed to the end of the linkage rod 91. The locking hook 92 is rotatably connected to the backrest bracket 20.

[0106] The rear support bracket 30 is provided with a fixing pin 33 that cooperates with the locking hook 92. The locking hook 92 has a limiting groove 922 that cooperates with the fixing pin 33. This limiting groove 922 can be engaged with the fixing pin 33. A torsion spring 93 is further provided between the rear support bracket 30 and the locking hook 92. The torsion spring 93 is used to provide a locking force to the locking hook 92 so that the locking hook 92 is held on the backrest bracket 20.

[0107] When the folding wheelchair is unfolded in place, the back surface of the locking hook 92 first contacts the fixing pin 33, and under the thrust of the rear support bracket 30, the locking hook 92 can rotate clockwise against the locking force of the torsion spring 93, so that the fixing pin 33 can be inserted into the limiting groove 922; at this time, the locking hook 92 rotates counterclockwise and resets under the action of the torsion spring 93, and the bottom of the locking hook 92 abuts against the limiting protrusion of the backrest bracket 20, thereby realizing the rotatable locking hook 92 and engaging the limiting groove 922 with the fixing pin 33, and further realizing the restraint on the backrest bracket 20 and the rear support bracket 30 to prevent the backrest bracket 20 and the rear support bracket 30 from separating from each other around the axis point b. At the same time, the backrest bracket and the rear support bracket 30 are limited and supported by the locking structure to prevent the backrest bracket 20 and the rear support bracket 30 from rotating towards each other around the axis point b. Furthermore, the backrest bracket 20 and the rear support bracket 30 are completely constrained from each other, and the first link mechanism group forms a stable triangular structure of the axis points a, c, and d.

[0108] Exemplarily, the hook mechanism 90 provided in the embodiments of the present application includes a first hook and a second hook. The first hook and the second hook are symmetrically arranged at both ends of the linkage rod 91, and the first hook and the second hook are symmetrical components. Taking the first hook as an example, its specific structure will be described.

[0109] The first hook includes a wrench 921. The wrench 921 is used to apply pressure to the first hook so that it overcomes the torsion force of the torsion spring 93 and the first hook rotates relative to the backrest bracket 20. For example, when the wrench 921 is pressed down, the first hook rotates clockwise, and then the first hook disengages from the fixed pin 33, thereby releasing the limit between the rear support frame 30 and the backrest bracket 20 to fold the folding wheelchair.

[0110] A positioning protrusion is provided at a position of the backrest bracket 20 close to the first hook. The positioning protrusion can abut against the bottom of the wrench 921. The torsion spring 93 provides an outward supporting force for the first hook so that the first hook has a tendency to rotate counterclockwise. When the bottom of the wrench 921 abuts against the positioning protrusion, the first hook rotates into place at this time, and the limiting groove 922 of the first hook is engaged with the fixed pin 33 to complete the locking of the backrest bracket 20 and the rear wheel 31 bracket.

[0111] It should be noted that the above-mentioned first hook and second hook can rotate synchronously. When the user operates the wrench 921 of any one of the hooks 92, the locking and unlocking of the backrest bracket 20 and the rear support frame 30 can be completed, so as to improve the user experience.

[0112] In the present specification, the embodiments or implementation manners are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

[0113] It should be noted that the phrases such as "an embodiment", "embodiment", "exemplary embodiment", "some embodiments", etc. mentioned in the specification indicate that the described embodiments may include specific features, structures or characteristics, but not necessarily every embodiment includes such specific features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when combining an embodiment to describe a specific feature, structure or characteristic, it is within the knowledge scope of those skilled in the art to implement such a feature, structure or characteristic in combination with other embodiments, whether explicitly or implicitly described.

[0114] Generally speaking, terms should be understood at least in part by their use in the context. For example, at least in part according to the context, the term "one or more" used in the text can be used to describe any feature, structure or characteristic in the sense of a singular, or can be used to describe a combination of features, structures or characteristics in the sense of a plural. Similarly, at least in part according to the context, terms such as "a" or "the" can also be understood as conveying a singular usage or conveying a plural usage.

[0115] It should be readily understood that the terms "on", "above", and "over" in this disclosure should be construed in the broadest manner such that "on" not only means "directly on something", but also includes the meaning of "on something" with intervening features or layers therebetween, and "above" or "over" not only includes the meaning of "above" or "over something", but may also include the meaning of "above" or "over something" with no intervening features or layers therebetween (i.e., directly on something).

[0116] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A folding wheelchair, characterized in that, It includes a front support frame, a rear support frame, a backrest support and an armrest, wherein the front support frame and the rear support frame are both rotatably connected to the backrest support; The armrest and the front support frame are rotatable relative to the backrest support, and the armrest is provided with a first limiting portion and a second limiting portion; The backrest bracket is provided with a first limiting structure, and the front support frame is provided with a second limiting structure; The first limiting structure is configured to abut and work in conjunction with the second limiting portion when the folding wheelchair is folded; and to abut and work in conjunction with the first limiting portion when the folding wheelchair is unfolded; When the foldable wheelchair is in an unfolded state, the first limiting structure abuts against the first limiting portion; when the foldable wheelchair is in a folded state, the second limiting portion is restricted between the second limiting structure and the first limiting structure and abuts against both of them respectively.

2. The folding wheelchair according to claim 1, wherein The armrest is provided with a first limiting protrusion and a second limiting protrusion at intervals to form the first limiting portion and the second limiting portion; The first limiting protrusion and the second limiting protrusion are both located on the side of the armrest facing the backrest bracket, and can abut against the first limiting structure.

3. The folding wheelchair according to claim 2, wherein The armrest and the front support frame are rotatably connected to the backrest support together; The rotation axis of the armrest, the rotation axis of the front support frame and the rotation axis of the backrest bracket are located on the same straight line.

4. The folding wheelchair according to claim 3, wherein The first limiting protrusion and the second limiting protrusion are arranged at intervals along the rotation axis of the armrest in the circumferential direction; The first limiting structure includes a third limiting protrusion, and the third limiting protrusion is located between the first limiting protrusion and the second limiting protrusion; The third limiting protrusion is configured such that when the folding wheelchair is in an unfolded state, the third limiting protrusion abuts against the first limiting protrusion, and when the folding wheelchair is in a folded state, the third limiting protrusion abuts against the second limiting protrusion.

5. The folding wheelchair according to claim 4, characterized in that, The armrest is L-shaped as a whole, and includes a bearing handle and a mounting handle; wherein the carrying handle is configured to provide support to a user, and the mounting handle is used to rotatably connect the armrest to the backrest bracket; The mounting handle is provided with a first limiting block and a second limiting block near the rotation connection to form the first limiting protrusion and the second limiting protrusion respectively; The backrest bracket is provided with a third limiting block near the rotation connection to form the third limiting protrusion.

6. The folding wheelchair according to claim 2, wherein, The armrest is rotatably connected to the front support frame and forms a first rotation axis; The front support frame is rotatably connected to the backrest support and forms a second rotation axis, and the second rotation axis is not colinear with the first rotation axis.

7. The folding wheelchair according to claim 6, characterized in that, The front support frame is fixedly provided with a rotating shaft block, and the armrest is provided with a first rotating shaft hole matched with the rotating shaft block; the armrest is sleeved on the rotating shaft block through the first rotating shaft hole and rotates relative to the front support frame; The rotating shaft block is provided with an eccentric second rotating shaft hole, and the backrest bracket is provided with a rotating shaft matched with the second rotating shaft hole; the front support frame is sleeved on the rotating shaft through the second rotating shaft hole and rotates relative to the backrest bracket.

8. The folding wheelchair according to claim 6, characterized in that, The first limiting structure includes a fourth limiting protrusion and a fifth limiting protrusion which are arranged at intervals; The fourth limiting protrusion is configured such that when the folding wheelchair is in the unfolded state, the fourth limiting protrusion abuts against the first limiting protrusion; The fifth limiting protrusion is configured such that when the folding wheelchair is in the folded state, the fifth limiting protrusion abuts against the second limiting protrusion.

9. The folding wheelchair according to claim 8, characterized in that, The fourth limiting protrusion or the first limiting protrusion is provided with a rounded corner structure facing each other; The fifth limiting protrusion or the second limiting protrusion is provided with an arc surface facing each other.

10. The folding wheelchair according to claim 9, wherein, The fourth limiting protrusion is a fourth limiting block provided on the backrest bracket, and the edge of the fourth limiting block facing the first limiting protrusion is provided with a rounded corner structure; The fifth limiting protrusion is a cylinder provided on the backrest bracket. When the cylinder abuts against the second limiting protrusion, it can slide on the limiting surface of the second limiting protrusion.

11. The folding wheelchair according to claim 2, characterized in that, The second limiting structure is the limiting surface provided by the front support frame facing the backrest bracket; The limiting surface is configured such that when the folding wheelchair is in the folded state, the limiting surface of the front support frame abuts against the second limiting protrusion.

12. The folding wheelchair according to claim 1, wherein, The folding wheelchair further includes a bracket link, a seat bracket and a seat link; The rear support frame is hinged to the backrest bracket. The bracket link is arranged between the rear support frame and the front support frame, and both ends of the bracket link are respectively hinged to the rear support frame and the front support frame; The seat link is arranged between the seat bracket and the front support frame. One end of the seat link is hinged to the seat bracket, and the other end of the seat link is connected to the front support frame.

13. The folding wheelchair according to claim 12, characterized in that, The backrest bracket and the rear support frame have a locking structure; The locking structure includes a first locking surface and a second locking surface. The backrest bracket is provided with a recess to form the first locking surface; One end of the rear support frame close to the backrest bracket is provided with a protrusion to form the second locking surface. The protrusion can be accommodated in the recess, and the first locking surface abuts against the second locking surface.

14. The folding wheelchair according to claim 12, wherein The folding wheelchair further includes a locking hook mechanism; The locking hook mechanism includes a linkage rod and at least one locking hook. The locking hook is arranged at the end of the linkage rod; the locking hook is rotatably connected to the backrest bracket, and a torsion spring is arranged between the two. The torsion spring is used to provide a locking force to the locking hook; The rear support frame is provided with a fixing pin cooperating with the locking hook, and the locking hook is provided with a limiting groove cooperating with the fixing pin. The locking hook is clamped to the fixing pin through the limiting groove.

15. The folding wheelchair according to claim 14, wherein The locking hook mechanism includes two locking hooks, and the two locking hooks are symmetrically arranged at both ends of the linkage rod; The locking hook is provided with a wrench, and the backrest bracket is provided with a positioning protrusion. The wrench is configured such that when it abuts against the positioning protrusion, the limiting groove of the locking hook is clamped to the fixing pin.

16. The folding wheelchair according to claim 12, wherein, The folding wheelchair further includes a front wheel and a rear wheel; The front wheel is installed at one end of the front support frame away from the backrest bracket, and the rear wheel is installed at one end of the rear support frame away from the backrest bracket.

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