WO2024020719A1 - Foldable wheelchair - Google Patents

Abstract

A foldable wheelchair, relating to the technical field of medical instruments and used for solving the technical problem that the folding and unfolding processes of existing foldable wheelchairs are complicated in that armrests (70) cannot move synchronously in the folding and unfolding processes. The foldable wheelchair comprises a front support frame (10), a backrest support (20), and armrests (70). The armrests (70) and the front support frame (10) are rotatable relative to the backrest support (20). The armrests (70) are each provided with a first limiting part and a second limiting part. The backrest support (20) is provided with a first limiting structure. The front support frame (10) is provided with a second limiting structure (12). The first limiting structure is configured to be capable of abutting against and moving synchronously with the second limiting part when the foldable wheelchair is folded, and to be capable of abutting against and moving synchronously with the first limiting part when the foldable wheelchair is unfolded. When the foldable wheelchair is folded or unfolded, the armrests (70) can move synchronously with the backrest support (20), and there is no need to fold or unfold the armrests (70) in advance, so that the folding process is simplified and the user experience is improved.

Description

folding wheelchair Technical field

The present application relates to the technical field of medical devices, and more specifically, to a folding wheelchair.

Background technique

Folding wheelchairs are a means of transportation for special groups such as the disabled, the elderly and frail, and medical and clinical rehabilitation patients. Because they can be folded, are easy to carry, and take up less space, they are widely used.

The existing folding wheelchair includes a backrest bracket and two armrests, wherein the two armrests are respectively hinged on both sides of the backrest bracket, and the armrests are rotatable relative to the backrest bracket. When the user is riding in the folding wheelchair, the armrests can be lifted upward to facilitate the user's riding.

However, during the folding and unfolding process of the above-mentioned 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, thereby affecting the user experience.

Contents of the invention

The purpose of this application is to provide a folding wheelchair. When folding the folding wheelchair, the armrests are linked to the backrest bracket, eliminating the need to pre-fold the armrests, thereby simplifying the folding process of the entire folding wheelchair and improving the user experience.

In order to achieve the above objectives, the embodiments of this application provide the following technical solutions:

A folding wheelchair provided by an embodiment of the present application includes a front support frame, a backrest bracket and an armrest; the armrest and the front support frame are rotatable relative to the backrest bracket, and the armrest is provided with a first limiting part and a third Two limiting parts; 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 allow the folding wheelchair to be folded. It can contact and link with the second limiting part; and when the folding wheelchair is unfolded, it can contact and link with the first limiting part; when the folding wheelchair is in an unfolded state, the The first limiting structure is in contact with the first limiting part; when the folding wheelchair is in the folded state, the second limiting part is limited between the second limiting structure and the first limiting part. between structures, and are in contact with both.

In a possible implementation, the handrail is provided with first limiting protrusions and second limiting protrusions at intervals to form the first limiting portion and the second limiting portion; A 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.

In a possible implementation, the armrest and the front support frame are jointly rotatably connected to the backrest bracket; the rotation axis of the armrest, the rotation axis of the front support frame and the rotation axis of the backrest bracket The axes are on the same straight line.

In a possible implementation, the first limiting protrusion and the second limiting protrusion are circumferentially spaced apart along the rotation axis of the handrail; the first limiting structure includes a third limiting protrusion. Protrusion, the third limiting protrusion is located between the first limiting protrusion and the second limiting protrusion; the third limiting protrusion is configured to when the folding wheelchair is in an unfolded state When the folding wheelchair is in the folded state, the third limiting protrusion contacts the first limiting protrusion. catch.

In a possible implementation, the armrest is L-shaped as a whole and includes a carrying handle and a mounting handle, wherein the carrying handle is configured to provide support to the user, and the mounting handle is used to attach the armrest to the user. Rotationally connected to the backrest bracket; the installation handle is provided with a first limit block and a second limit block near the rotation connection to form the first limit protrusion and the second limit respectively. bulge;

The backrest bracket is provided with a third limiting block near the rotation connection to form the third limiting protrusion.

In a possible implementation, the armrest is rotationally connected to the front support frame and forms a first rotation axis; the front support frame is rotationally connected to the backrest bracket and forms a second rotation axis, and the The second rotation axis is not collinear with the first rotation axis.

In a possible implementation, the front support frame is fixedly provided with a rotation shaft block, and the handrail is provided with a first rotation shaft hole that matches the rotation shaft block; the handrail passes through the first rotation shaft The hole is sleeved on the rotating shaft block 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 an eccentric second rotating shaft hole that matches the second rotating shaft hole. the rotation shaft; the front support frame is sleeved on the rotation shaft through the second rotation shaft hole, and rotates relative to the backrest bracket.

In a possible implementation, the first limiting structure includes a fourth limiting protrusion and a fifth limiting protrusion arranged at intervals; the fourth limiting protrusion is configured to when the folding wheelchair is in In the unfolded state, the fourth limiting protrusion is in contact with 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 The protrusion is in contact with the second limiting protrusion.

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 The protrusions are provided with arcuate faces facing each other.

In a possible implementation, the fourth limiting protrusion is a fourth limiting block provided on the backrest bracket, and the fourth limiting block faces an edge of the first limiting protrusion. The edge is provided with a rounded corner structure; the fifth limiting protrusion is a cylinder provided on the backrest bracket. When the cylinder abuts the second limiting protrusion, the second limiting protrusion can The limit surface slides.

In a possible implementation, the second limiting structure is a limiting surface provided by the front support frame toward the backrest bracket; the limiting surface is configured to when the folding wheelchair is in a folded state, The limiting surface of the front support frame is in contact with the second limiting protrusion.

In a possible implementation, the folding wheelchair further includes a rear support frame, a support link, a seat support and a seat link; the rear support frame is hinged to the backrest bracket, and the support link It is arranged between the rear support frame and the front support frame, and the two ends of the support link are hinged to the rear support frame and the front support frame respectively; the seat link is arranged on the Between the seat frame and the front support frame, one end of the seat link is hingedly connected to the seat frame, and the other end of the seat link is connected to the front support frame.

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, and the backrest bracket is provided with a recess to The first locking surface is formed; a protrusion is provided at one end of the rear support frame close to the backrest bracket to form a second locking surface, the protrusion can be accommodated in the depression, and the third A locking surface is in contact with the second locking surface.

In a possible implementation, the folding wheelchair further includes a hook mechanism; the hook mechanism includes a linkage rod and at least one lock hook, and the lock hook is provided at an end of the linkage rod; the lock The hook is rotatably connected to the backrest bracket, and a torsion spring is provided between the two. The torsion spring is used to provide locking force to the lock hook; the rear support frame is provided with a torsion spring that cooperates with the lock hook. Fixed pin, the lock hook is provided with a limiting groove that cooperates with the fixed pin, and the lock hook engages with the fixed pin through the limiting groove.

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 wrench. and a positioning protrusion. When the wrench is configured to abut against the positioning protrusion, the limiting groove of the lock hook engages with the fixing pin.

In a possible implementation, the folding wheelchair further includes a front wheel and a rear wheel; the front wheel is installed on an end of the front support frame away from the backrest bracket, and the rear wheel is installed on the rear support frame. The end of the frame away from the backrest bracket.

Compared with related technologies, the folding wheelchair provided by the embodiment of the present application has the following advantages:

The folding wheelchair provided by the embodiment of the present application includes a front support frame that rotates relative to the backrest bracket and an armrest, wherein the armrest has a first limiting part and a second limiting part, and the backrest bracket is provided with a first limiting part and a second limiting part. The second limiting part abuts the first limiting structure, and during the folding process of the folding wheelchair, the backrest bracket contacts the second limiting part through the first limiting structure, so that the two are linked, and when the folding wheelchair is unfolded During the process, the backrest bracket contacts the first limiting part through the first limiting structure to achieve linkage between the two.

Furthermore, when the folding wheelchair is in the folded state, the second limiting part 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 avoid The armrests sway to improve the stability of the folding wheelchair in the folded state.

Compared with the related technical solution in which the armrest cannot participate in the linkage during the folding and unfolding process of the folding wheelchair, and the armrest needs to be folded in advance, resulting in a complicated folding and unfolding process, the folding wheelchair provided in the embodiment of the present application can be folded and unfolded. When unfolded, the armrests and backrest brackets can be linked, eliminating the need to pre-fold or unfold the armrests, thereby simplifying the folding process and improving user experience.

In addition to the technical problems solved by the embodiments of the present disclosure, the technical features constituting the technical solutions and the beneficial effects brought by the technical features of these technical solutions described above, there are other technologies that can be solved by the folding wheelchair provided by the embodiments of the present application. The problems, other technical features included in the technical solution, and the beneficial effects brought by these technical features will be further described in detail in the specific implementation modes.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of a folding wheelchair provided by an embodiment of the present application;

Figure 2 is a schematic diagram of the unfolded state of the folding wheelchair provided by the embodiment of the present application;

Figure 3 is a schematic diagram of the folding state of the folding wheelchair provided by the embodiment of the present application;

Figure 4 is an exploded schematic diagram of the folding wheelchair provided by the embodiment of the present application;

Figure 5 is a schematic diagram of the mechanism of the folding wheelchair provided by the embodiment of the present application;

Figure 6 is a schematic diagram of the arrangement of the handrail and its first and second limiting protrusions provided by the embodiment of the present application;

Figure 7 is a schematic diagram of the first limiting structure provided on the backrest bracket according to the embodiment of the present application;

Figure 8 is an enlarged schematic diagram of point A in Figure 7;

Figures 9 to 12 are schematic diagrams of the folding wheelchair in the process of folding and unfolding according to an embodiment of the present application;

Figure 13 is a schematic connection diagram of the armrest, backrest bracket and front wheel bracket provided by another embodiment of the present application;

Figures 14 to 17 are schematic diagrams of the folding and unfolding process of the folding wheelchair in another embodiment of the present application;

Figure 18 is a schematic layout diagram of the hook mechanism and locking structure provided by the embodiment of the present application;

Figure 19 is a schematic diagram of the connection between the linkage rod and the lock hook in the lock hook mechanism provided by the embodiment of the present application;

Figure 20 is an enlarged schematic diagram of the angle B in Figure 18;

Figure 21 is an enlarged schematic diagram of position B in Figure 18 from another angle.

Reference signs:

10-Front support frame;

11-front wheel; 12-second limiting structure; 13-rotating shaft block; 131-second rotating shaft hole;

20-Backrest bracket;

21-the first locking surface; 22-the third limit protrusion; 23-the fourth limit protrusion; 24-the fifth limit protrusion; 25-the rotation axis;

30-Rear support frame;

31-rear wheel; 32-second locking surface; 33-fixing pin;

40-Bracket connecting rod;

50-seat link;

60-seat bracket;

70-handrail; 71-carrying handle; 72-installation handle; 73-first limiting protrusion; 74-second limiting protrusion; 75-first rotating shaft hole; 76-locking washer;

80-pedal;

90-Lock hook mechanism;

91-linkage rod; 92-lock hook; 921-wrench; 922-limiting slot; 93-torsion spring.

Detailed ways

As mentioned in the background art, folding wheelchairs in the related art have a problem of complicated folding and unfolding processes, which affects the user experience. The inventor found through research that the reason for this problem is that the existing folding wheelchair includes a backrest bracket and a backrest bracket. Two armrests, two of which are hinged on both sides of the backrest bracket respectively, and the armrests can rotate relative to the backrest bracket. When the user is riding in the folding wheelchair, the armrests can be lifted upward to facilitate the user's riding. However, during the folding and unfolding process of the above-mentioned folding wheelchair, the armrests cannot be linked, and the armrests need to be folded in advance.

In view of the above technical problems, embodiments of the present application provide a folding wheelchair, including a front support frame and an armrest that rotate relative to a backrest bracket respectively, wherein the armrest has a first limiting part and a second limiting part, and the backrest bracket is provided with a A first limiting structure in which the first limiting part and the second limiting part are in contact, and during the folding process of the folding wheelchair (rotating the backrest bracket), the backrest bracket is in contact with the second limiting part through the first limiting structure, to link the two. On the contrary, when the folding wheelchair is in the unfolding process, the backrest bracket contacts the first limiting part through the first limiting mechanism, and the two are linked.

With this arrangement, when the folding wheelchair provided by the embodiment of the present application is folded or unfolded, the armrests and the backrest bracket can be linked, eliminating the need to pre-fold or unfold the armrests, thereby simplifying the folding and unfolding process and improving the user experience.

In order to make the above purposes, features and advantages of the embodiments of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without any creative work shall fall within the scope of protection of this application.

As shown in Figures 1 to 5, the folding wheelchair provided by the embodiment of the present application includes a front support frame 10, a backrest bracket 20, an armrest 70, a front wheel 11, a rear wheel 31, a rear support frame 30, a bracket link 40, and a seat. The bracket 60, the seat link 50 and the footrest 80; among them, the front support frame 10, the backrest bracket 20, the rear support frame 30 and the bracket link 40 are hinged together and form a foldable and deformable first link mechanism.

The front support frame 10, the backrest frame 20, the seat frame 60, and the seat link 50 are hinged together to form a foldable and deformable second linkage mechanism, and the second linkage mechanism is linked with the first linkage mechanism to During the unfolding or folding process of the folding wheelchair, the seat bracket 60 folds or unfolds accordingly.

Specifically, the front support frame 10 is used to install the front wheel 11, which is also called a front wheel support. 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 bracket 30 is used to install the rear wheel 31 and is also called a rear wheel bracket. Wherein, the backrest bracket 20 includes a first installation part and a second installation part, and the first installation part is used to install the back cushion of the folding wheelchair, and the second installation part is used to connect with the front support frame 10, the seat bracket 60, and the rear support frame. 30 is connected, and the end of the front support frame 10 away from the front wheel 11 and the end of the rear support frame 30 away from the rear wheel 31 can be rotatably connected to the second mounting part of the backrest bracket 20 respectively, and can rotate relative to the backrest bracket 20.

A bracket link 40 is provided between the rear support frame 30 and the front support frame 10. The two ends of the bracket link 40 are respectively hinged with the rear support frame 30 and the front support frame 10, that is, the front support frame 10, the backrest bracket 20, and the rear support. The frame 30 and the bracket link 40 are rotationally connected to each other and form pivot points a, b, c, d to form a foldable and deformable first link mechanism to realize the front support frame 10, rear support frame 30, 30 of the folding wheelchair. Folding of the backrest bracket 20. When the foldable wheelchair is in the unfolded state, the backrest bracket 20 and the rear support frame 30 are limited and supported by each other, thereby forming a stable triangular structure with pivot points a, c, and d.

The above-mentioned seat link 50 is used to connect the seat bracket 60 and the front support frame 10, wherein one end of the seat link 50 is hinged with the seat bracket 60, and the other end of the seat link 50 is hinged with the front support frame 10, that is, The front support frame 10, the seat link 50, the seat frame 60 and the backrest frame 20 are hinged to each other and form pivot points e, f, g, a to form a foldable and deformable second link mechanism to achieve folding During the folding and unfolding process of the wheelchair, the seat bracket 60 folds accordingly.

The folding wheelchair provided by the embodiment of the present application also includes armrests 70 provided on both sides of the backrest bracket 20 , and the armrests 70 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 the user folds the wheelchair up or down, the armrest 70 can be lifted upward to facilitate the user's riding; and when the user rides on the folding wheelchair, the armrest 70 can provide support for the user to enhance the user experience.

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 of the armrest 70 facing the backrest bracket 20; the backrest bracket 20 is provided with a third limiting portion. A limiting structure. The first limiting structure can contact the first limiting part and the second limiting part. It should be noted that the above-mentioned first limiting part and the second limiting part may be formed on the armrest 70 respectively. The first limiting structure includes at least one limiting protrusion formed on the backrest bracket 20 .

Exemplarily, the backrest bracket 20 may be provided with one or two limiting protrusions. For example, the armrest 70 is provided with two spaced 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 is located on the rotation path formed by the two limiting protrusions of the armrest 70 .

Alternatively, the armrest 70 is provided with two spaced-apart limiting protrusions, and the backrest bracket 20 is also provided with two limiting protrusions. The limiting protrusions on the backrest bracket 20 are not located at the two limiting protrusions of the armrest. On the formed rotation path, it is only necessary that the limit protrusions on the armrest 70 and the limit protrusions on the backrest bracket 20 are matched, so that the armrest 70 can be linked with the backrest bracket 20 during the folding and unfolding process of the folding wheelchair. , the embodiment of the present application does not limit this.

Referring to Figures 9 to 12, when the backrest bracket 20 is rotated counterclockwise to fold the folding wheelchair, that is, during the process of converting the folding wheelchair from the unfolded state shown in Figure 9 to the folded state shown in Figure 12, the backrest bracket 20 The first limiting structure (the first limiting structure includes a limiting protrusion in the embodiment shown in this figure) is gradually separated from the first limiting part, as shown in FIG. 10 . When the backrest bracket 20 rotates to a certain angle, the first limiting structure can contact the second limiting portion 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 11.

The front support frame 10 is provided with a second limiting structure 12, and the second limiting structure 12 is configured to contact the second limiting portion when the folding wheelchair is in a folded state. After the first limiting structure and the second limiting part of the backrest bracket 20 are in contact, the backrest bracket 20 continues to rotate counterclockwise, so that the second limiting part can be limited between the first limiting structure and the second limiting part. 12, thereby completing the position limiting of the armrest 70, preventing the armrest 70 from shaking, and improving the stability of the foldable wheelchair in the folded state, as shown in Figure 12.

On the contrary, when the above-mentioned first limiting structure is unfolding the folding wheelchair, the first limiting structure can contact the first limiting part and drive the armrest 70 to move together.

Specifically, when the foldable wheelchair is unfolded, that is, the folding wheelchair is converted from the folded state shown in FIG. 12 to the unfolded state shown in FIG. 9 . First, the front support frame 10 and the backrest bracket 20 rotate in the opposite direction (clockwise), and the second limiting structure 12 of the front support frame 10 and the first limiting structure of the backrest bracket 20 gradually move away from each other. During this process, the armrest 70 Under the action of gravity or assembly damping, there is a counterclockwise rotation force, so the armrest 70 will not rotate clockwise against gravity. At this time, the second limiting portion of the armrest 70 continues to interact with the second limiting structure of the front support frame 10 12Keep fit.

As the backrest bracket 20 continues to rotate clockwise, the first limiting structure can contact the first limiting portion, thereby realizing the linkage between the armrest 70 and the backrest bracket 20 , thereby driving the armrest 70 to rotate clockwise. When the backrest bracket 20 Rotated in place, at this time, the backrest bracket 20 and the rear support bracket 30 are limited and supported by each other, thereby forming a stable triangular structure with rotation axis points a, c, and d.

At the same time, the armrest 70 is also deployed in place, and the first limiting part is kept in contact with the first limiting structure, which can prevent the armrest 70 from rotating counterclockwise, that is, prevent the armrest 70 from being folded due to external force, thereby improving the support reliability of the armrest 70 sex. It should be noted that the armrest 70 can continue to rotate clockwise, so that the armrest 70 can be folded upward, so that the user can lift the armrest 70 upward when folding the wheelchair up or down.

Compared with the related technical solution in which the armrest 70 cannot participate in the linkage during the folding and unfolding process of the folding wheelchair, and the armrest 70 needs to be folded in advance, resulting in a complicated folding process, the folding wheelchair provided in the embodiment of the present application can be folded and unfolded. When unfolded, the armrest 70 and the backrest bracket 20 can be linked, eliminating the need to fold or unfold the armrest 70 in advance, thus simplifying the folding process and improving user experience.

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 bracket 20 and the front support frame 10. time, the armrest 70 can be prevented from shaking, thereby improving the stability of the folding wheelchair in the folded state.

As shown in Figure 6, based on the above embodiment, in the embodiment of the present application, the handrail 70 can be provided with first limiting protrusions 73 and second limiting protrusions 74, wherein the first limiting protrusions 73, 74 can be spaced apart. The second limiting protrusion 74 can protrude from the inner side of the armrest 70 toward the backrest bracket 20 to form a first limiting portion and a second limiting portion, that is, the first limiting protrusion 73 and the second limiting protrusion 74 . The limiting protrusion 74 and the armrest 70 are of an integrated structure. Furthermore, when the folding wheelchair is in the folded state, the second limiting protrusion 74 can contact with the first limiting structure. When the folding wheelchair is in the unfolded state, the first limiting protrusion 73 can contact with the first limiting structure. Abut.

The armrest 70 and the front support frame 10 in the embodiment of the present application can rotate relative to the backrest bracket 20. According to the rotation connection scheme between the three, the structure of the first limiting structure of the backrest bracket 20 and the first limiting structure can be modified. The cooperation scheme with the first limiting protrusion 73 and the second limiting protrusion 74 of the armrest 70 will be described below.

In one embodiment, the armrest 70 and the front support frame 10 are coaxially and rotationally connected to the backrest bracket 20. For example, the armrest 70 and the front support frame 10 are jointly rotationally connected to a rotation axis, and are connected to the backrest bracket 20 through this rotation axis. The rotational connection means that the rotational axis of the armrest 70 , the rotational axis of the front support frame 10 and the rotational axis of the backrest bracket 20 are all located on the same straight line.

On the basis that the armrest 70 and the front support frame 10 are jointly rotatably connected to the backrest bracket 20 , the first limiting protrusion 73 and the second limiting protrusion 74 in the armrest 70 in the embodiment of the present application can be along the rotation axis of the armrest 70 Circumferentially and spaced apart. For example, the armrest 70 is provided with a rotation shaft hole and is sleeved on the rotation shaft through the rotation shaft hole. The first limiting protrusion 73 and the second limiting protrusion 74 can be arranged at circumferential intervals around the rotation shaft hole.

As shown in Figures 7 and 8, 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 73. between the protrusions 74 and 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 bracket 20 rotates counterclockwise, and the third limiting protrusion 22 can contact the second limiting protrusion 74 to link the armrest 70 with the backrest bracket 20; conversely, when the folding wheelchair is unfolded At this time, the third limiting protrusion 22 can contact the first limiting protrusion 73 and realize the linkage between the armrest 70 and the backrest bracket 20 .

Further, when the folding wheelchair is in the folded state, the third limiting protrusion 22 is in contact with one side of the second limiting protrusion 74 , and the other side of the second limiting protrusion 74 is in contact with the second limiting structure 12 Abut. For example, the second limiting structure 12 may be a limiting surface provided by the front support frame 10 toward the backrest bracket 20, and the limiting surface is configured such that when the folding wheelchair is in the folded state, the limiting surface of the front supporting frame 10 is in contact with the second limiting surface. The protrusions 74 abut, so that the armrest 70 is limited between the front support frame 10 and the backrest frame 20 .

Exemplarily, the armrest 70 can be in an L-shaped structure as a whole, which includes a load-bearing handle 71 and an installation handle 72 , where the load-bearing handle 71 is used to provide support to the user, and the installation handle 72 is used to rotationally connect the armrest 70 to the backrest bracket 20 , the armrest 70 has a rotation axis hole located at an end of the mounting handle 72 away from the carrying handle 71 .

The mounting handle 72 is provided with a first limit block and a second limit block respectively near the rotation shaft hole. The first limit block and the second limit block are arranged at intervals along the circumferential direction of the rotation shaft hole and form a first limit block. The protrusion 73 and the second limiting protrusion 74, that is, the installation handle 72 is provided with a first limiting block and a second limiting block respectively near the rotation connection, so as to form the first limiting protrusion 73 and the second limiting protrusion respectively. Bump 74.

It should be noted that the above-mentioned first and second limiting blocks can be made separately from the handrail 70 , and the first and second limiting blocks are connected to the mounting handle 72 of the handrail 70 to form a first limiting block. The protrusion 73 and the second limiting protrusion 74. Of course, the first limiting block and the second limiting block can also be integrated with the handrail 70 , which is not limited in this embodiment. Preferably, the first limiting block and the second limiting block can be installed on the handrail respectively. 70 on the mounting handle 72.

Correspondingly, the backrest bracket 20 is provided with a third limiting block close to the rotation connection, and forms a third limiting protrusion 22 . When the armrest 70 is rotationally connected to the backrest bracket 20, the third limiting block is located between the first limiting block and the second limiting block. The third limiting block has a function corresponding to the first limiting block and the second limiting block respectively. Matching limit surface.

When the armrest 70 and the front support frame 10 are jointly rotated and connected to the backrest bracket 20, and the rotation axes of the three are collinear, the folding and unfolding process of the folding wheelchair is explained as follows:

When the folding wheelchair is folded, the folding wheelchair is converted from the unfolded state shown in FIG. 9 to the folded state shown in FIG. 12 . As shown in Figures 9 and 10, when the backrest bracket 20 is rotated counterclockwise, the front support frame 10 follows the movement, and 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 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, the armrest 70 can move together with the front support frame 10 .

As shown in Figure 11, continue to rotate the backrest bracket 20. When the backrest bracket 20 rotates to a certain angle, its third limiting block can contact the second limiting block and drive the armrest 70 to rotate together, that is, when the wheelchair is folded During the folding process, the armrest 70 can be linked with the backrest bracket 20 . As shown in Figure 12, when the folding wheelchair is in the folded state, one side of the second limiting block is in contact with the third limiting block, and the other side of the second limiting block is in contact with the limiting surface of the front support frame 10. connected to limit the armrest 70 between the front support frame 10 and the backrest bracket 20, thereby completing the position limitation of the armrest 70, preventing the armrest 70 from shaking, and improving the stability of the folding wheelchair in the folded state.

On the contrary, when the folding wheelchair is unfolded, that is, the folding wheelchair is converted from the unfolded state shown in FIG. 12 to the folded state shown in FIG. 9 . First, after the backrest bracket 20 rotates clockwise to a certain angle, the front support frame 10 rotates clockwise along with the backrest bracket 20, and the limiting surface of the front support frame 10 and the third limiting block of the backrest bracket 20 gradually move away. During this process Since the armrest 70 has a counterclockwise rotation force under the action of gravity or assembly damping, the armrest 70 will not rotate clockwise against gravity. At this time, the second limiting block of the armrest 70 continues to be in contact with the front support frame 10 The surface remains snug.

As the backrest bracket 20 continues to rotate clockwise, the third limiting block of the backrest bracket 20 can contact the first limiting block, thereby realizing the linkage between the armrest 70 and the backrest bracket 20, thereby driving the armrest 70 to rotate clockwise. When the backrest bracket 20 is rotated in place, the armrest 70 is also unfolded in place; and the first limit block and the third limit 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 lifting the armrest. 70 supports reliability.

In another embodiment, the armrest 70 is rotatably connected to the front support frame 10 and forms a first rotation axis, the front support frame 10 is rotatably connected to the backrest bracket 20 and forms a second rotation axis, and the second rotation axis is connected with the first rotation axis. The axes of rotation are not collinear.

As shown in FIG. 13 , the front support frame 10 is fixedly provided with a rotating shaft block 13 , and the handrail 70 is provided with a first rotating shaft hole 75 that matches the rotating shaft block 13 , and the first rotating shaft hole 75 is located on the mounting handle 72 of the handrail 70 On the top, the armrest 70 is sleeved on the rotating shaft block 13 through the first rotating shaft hole 75, and is locked through the locking washer 76 to prevent the armrest 70 from falling off the rotating shaft block 13, so as to achieve the rotational connection of the armrest 70 to the front support. On rack 10.

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 matches the second rotating shaft hole 131. The front support frame 10 is sleeved on the rotating shaft 25 through the second rotating shaft hole 131. , thereby realizing the rotation of the front support frame 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 larger than the shaft diameter of the rotating shaft 25.

In this embodiment, the first limiting structure includes fourth limiting protrusions 23 and fifth limiting protrusions 24 arranged at intervals, and the fourth limiting protrusions 23 and the fifth limiting protrusions 24 are used when folding the wheelchair. When in the folded or unfolded state, it can contact the first limiting protrusion 73 and the second limiting protrusion 74 of the armrest 70 .

Specifically, as shown in Figure 14, the fourth limiting protrusion 23 is configured to contact the first limiting protrusion 73 when the folding wheelchair is in the unfolded state; the fifth limiting protrusion 24 is configured such that when the foldable wheelchair is in the folded state, the fifth limiting protrusion 24 abuts the second limiting protrusion 74 , as shown in FIG. 16 . And, when the folding wheelchair is in the folding process, the fifth limiting protrusion 24 can contact the second limiting protrusion 74 to link the armrest 70 with the backrest bracket 20, as shown in Figure 15; or when the folding wheelchair When in the unfolded state, the fourth limiting protrusion 23 can contact the first limiting protrusion 73 to link the armrest 70 with the backrest bracket 20 , as shown in FIG. 17 .

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 limiter blocks of the backrest bracket 20 and the limiter blocks of the armrest 70 . In order to avoid jamming during the linkage 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 when the two are in a contact state, Can slide relative to each other. Correspondingly, the fifth limiting protrusion 24 or the second limiting protrusion 74 is provided with arcuate surfaces facing each other, so that they can slide relative to each other when they are in an abutting state.

For example, 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 with the first limiting block. The fourth limiting block and the third limiting block Each limiting block has 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 contacts and slides relative to the first limiting block. 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 the limiting surface of the first limiting block, thereby realizing the linkage between the armrest 70 and the backrest bracket 20 .

Similarly, the fifth limiting protrusion 24 may be a cylinder provided on the backrest bracket 20, and the cylinder is used to abut the second limiting block. The second limiting block includes a plurality of limiting surfaces, and the adjacent limiting surfaces have edges. When the cylinder contacts the limiting surface of the second limiting block, a line contact is formed between the two, which can make the fifth limiting surface The block contacts and slides relative to the second limiting block. For example, during the folding process, as the backrest bracket 20 rotates counterclockwise, the cylinder begins to contact the second limiter block, and the backrest bracket 20 continues to rotate, and the cylinder slides on the limiter surface of the second limiter block until the armrest When 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 contact the limiting surface of the front support frame 10 .

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 process of the folding wheelchair is not related to the armrest 70 , the front support frame 10 and the backrest bracket 20 . The coaxial connection scheme is similar and will not be described again here.

As shown in Figures 18, 20, and 21, and referring to Figure 5, based on the above embodiments, in the folding wheelchair provided by the embodiment of the present application, the backrest bracket 20 and the rear support frame 30 have a locking structure. When folded, When the 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 with pivot points a, c, and d.

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, wherein the backrest bracket 20 is provided with a position close to the rear support frame 30. The surface is recessed to form the first locking surface 21 , that is, the recessed surface forms the first locking surface 21 . The end of the rear support frame 30 close to the backrest bracket 20 has a protrusion. The protrusion is matched with the recess. 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 is rotated into position, the protrusion can be embedded in the depression, and the first locking surface 21 and the second locking surface 32 are in contact with each other, thereby completing the connection between the backrest bracket 20 and the second locking surface 32 . The limiting support of the rear support frame 30 prevents the backrest bracket 20 and the rear support frame 30 from rotating relative to each other around the rotation axis point b.

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

The rear support frame 30 is provided with a fixed pin 33 that cooperates with the lock hook 92. The lock hook 92 has a limiting groove 922 that cooperates with the fixed pin 33. This limiting groove 922 can be engaged with the fixed pin 33. The rear support frame 30 and the lock A torsion spring 93 is also provided between the hooks 92 . The torsion spring 93 is used to provide a locking force to the lock hook 92 so as to keep the lock hook 92 on the backrest bracket 20 .

When the folding wheelchair is deployed in place, the back side of the locking hook 92 first contacts the fixing pin 33, and under the thrust of the rear support frame 30, the locking hook 92 can overcome the locking force of the torsion spring 93 and rotate clockwise, thereby fixing the pin 33 It can be snapped into the limit groove 922; at this time, the lock hook 92 rotates counterclockwise and resets under the action of the torsion spring 93, and the bottom of the lock hook 92 contacts the limit protrusion of the backrest bracket 20, thereby realizing a rotatable lock hook. 92, and the limiting groove 922 is engaged with the fixing pin 33, thereby constraining the backrest bracket 20 and the rear support frame 30, and preventing the backrest bracket 20 and the rear support frame 30 from being separated from each other around the axis point b. At the same time, the back bracket and the rear support frame 30 are limited and supported by a locking structure to prevent the backrest bracket 20 and the rear support frame 30 from rotating relative to each other around the axis point b, so that the backrest bracket 20 and the rear support frame 30 are completely connected to each other. Constraint, the first link mechanism group forms a stable trigonal structure with rotation axis points a, c, and d.

Illustratively, the hook mechanism 90 provided in the embodiment of the present application includes a first lock hook and a second lock hook, wherein the first lock hook and the second lock hook are symmetrically arranged at both ends of the linkage rod 91, and the first lock hook It is a symmetrical piece with the second lock hook, and its specific structure will be described by taking the first lock hook as an example.

The first lock hook includes a wrench 921 , and the wrench 921 is used to exert pressure on the first lock hook so that it overcomes the torsion force of the torsion spring 93 , and the first lock hook rotates relative to the backrest bracket 20 . For example, when the wrench 921 is pressed down and the first lock hook rotates clockwise, the first lock hook is disengaged from the fixing pin 33, thereby releasing the limit between the rear support frame 30 and the backrest bracket 20 to fold the foldable wheelchair.

The backrest bracket 20 is provided with a positioning protrusion near the first lock hook. The positioning protrusion can contact the bottom of the wrench 921. The torsion spring 93 provides outward support force for the first lock hook so that the first lock hook has Rotate counterclockwise, when the bottom of the wrench 921 contacts the positioning protrusion, the first lock hook rotates in place, and the limit groove 922 of the first lock hook engages with the fixing pin 33 to complete the alignment of the backrest bracket 20 Locking of 31 brackets with rear wheels.

It should be noted that the above-mentioned first lock hook and second lock hook can rotate synchronously. When the user operates the wrench 921 of any lock hook 92, the backrest bracket 20 and the rear support bracket 30 can be locked and unlocked. This improves user experience.

Each embodiment or implementation mode in this specification is described in a progressive manner. Each embodiment focuses on its differences from other embodiments. The same and similar parts between various embodiments can be referred to each other.

It should be noted that references in the specification to "one embodiment," "an embodiment," "exemplary embodiments," "some embodiments," etc. mean that the described embodiments may include specific features, structures or characteristics, but not necessarily Each embodiment includes this particular feature, structure, or characteristic. Furthermore, such phrases are not necessarily referring to the same embodiment. Furthermore, where a particular feature, structure or characteristic is described in connection with an embodiment, it is within the knowledge of a person skilled in the art to implement such feature, structure or characteristic in conjunction with other embodiments, explicitly or not explicitly described.

Generally speaking, terms should be understood, at least in part, by context of use. For example, the term "one or more" as used herein may be used to describe any feature, structure, or characteristic in the singular, or may be used to describe a combination of features, structures, or characteristics in the plural, depending at least in part on context. . Similarly, terms such as "a" or "the" may also be understood to convey either a singular usage or a plural usage, depending at least in part on the context.

It should be readily understood that "on," "over," and "over" in this disclosure should be interpreted in the broadest manner, so that "on" does not only mean " "directly on something" also includes the meaning of "on something" with intermediate features or layers in between, and "on..." or "on..." not only includes "on something" or "on something" The meaning of "on" may also include the meaning of "over" or "over" something without intervening features or layers (i.e., directly on something).

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application, but not to limit it; 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: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features can be equivalently replaced; and these modifications or substitutions do not deviate from the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present application. scope.

Claims (16)

A folding wheelchair, which is characterized in that it includes a front support frame, a back support frame and an armrest; The armrest and the front support frame are rotatable relative to the backrest bracket, and the armrest is provided with a first limiting part and a second limiting part; The backrest bracket is provided with a first limiting structure, and the front support frame is equipped with a second limiting structure; The first limiting structure is configured to contact and link with the second limiting portion when folding the foldable wheelchair; and when unfolding the folding wheelchair, it can engage with the first limiting portion when unfolding the folding wheelchair. The limiting parts are in contact and linked together; When the folding wheelchair is in the unfolded state, the first limiting structure is in contact with the first limiting part; when the folding wheelchair is in the folded state, the second limiting part is limited to the Between the second limiting structure and the first limiting structure, and in contact with both of them respectively. The folding wheelchair according to claim 1, wherein the armrest is provided with first limiting protrusions and second limiting protrusions at intervals to form the first limiting portion and the second limiting protrusion. department; 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. The folding wheelchair according to claim 2, wherein the armrest and the front support frame are jointly rotatably connected to the backrest bracket; 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. The folding wheelchair according to claim 3, wherein the first limiting protrusion and the second limiting protrusion are circumferentially spaced apart along the rotation axis of the armrest; The first limiting structure includes a third limiting protrusion, the third limiting protrusion is located between the first limiting protrusion and the second limiting protrusion; The third limiting protrusion is configured to contact the first limiting protrusion when the folding wheelchair is in the unfolded state, and when the folding wheelchair is in the folded state, The third limiting protrusion is in contact with the second limiting protrusion. The folding wheelchair according to claim 4, characterized in that the armrest is L-shaped as a whole and includes a carrying handle and an installation handle; wherein the carrying handle is configured to provide support to a user, and the mounting handle is used to rotationally connect the armrest to the backrest bracket; The mounting handle is provided with a first limiting block and a second limiting block respectively 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. 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 rotationally connected to the backrest bracket and forms a second rotation axis, and the second rotation axis is not collinear with the first rotation axis. The folding wheelchair according to claim 6, wherein the front support frame is fixedly provided with a rotating shaft block, and the handrail is provided with a first rotating shaft hole that matches the rotating shaft block; the handrail passes through the rotating shaft block. The first rotating shaft hole is sleeved on the rotating shaft block 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 that matches the second rotating shaft hole; the front support frame is sleeved on the second rotating shaft hole through the second rotating shaft hole. on the rotation axis and rotates relative to the backrest bracket. The folding wheelchair according to claim 6, wherein the first limiting structure includes fourth and fifth limiting protrusions arranged at intervals; The fourth limiting protrusion is configured to contact the first limiting protrusion when the folding wheelchair is in an unfolded state; The fifth limiting protrusion is configured to abut against the second limiting protrusion when the folding wheelchair is in a folded state. The folding wheelchair according to claim 8, wherein 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 arcuate surfaces facing each other. The folding wheelchair according to claim 9, characterized in that the fourth limiting protrusion is a fourth limiting block provided on the backrest bracket, and the fourth limiting block faces the first limiting block. The raised edges are provided with a rounded corner structure; The fifth limiting protrusion is a cylinder provided on the backrest bracket. When the cylinder is in contact with the second limiting protrusion, it can slide on the limiting surface of the second limiting protrusion. The folding wheelchair according to claim 1, wherein the second limiting structure is a limiting surface provided by the front support frame toward 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 contacts the second limiting protrusion. The folding wheelchair according to claim 1, characterized in that 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 connecting rod is arranged between the rear support frame and the front support frame, and the two ends of the support connecting rod are connected to the rear support frame respectively. , the front support frame is hinged; The seat link is disposed 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 connection. The folding wheelchair according to claim 12, wherein 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, and 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 a second locking surface, the protrusion can be accommodated in the depression, and the first locking surface and the second locking surface are The locking surfaces are in contact. The folding wheelchair according to claim 12, wherein the folding wheelchair further includes a hook mechanism; The lock hook mechanism includes a linkage rod and at least one lock hook, and the lock hook is provided at the end of the linkage rod; the lock hook is rotationally connected to the backrest bracket, and a torsion spring is provided between the two. , the torsion spring is used to provide locking force to the lock hook; The rear support frame is provided with a fixing pin that cooperates with the lock hook, the lock hook is provided with a limiting groove that cooperates with the fixed pin, and the lock hook engages with the fixed position through the limiting groove. pin. 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 lock hook is provided with a wrench, and the backrest bracket is provided with a positioning protrusion. When the wrench is configured to abut the positioning protrusion, the limiting groove of the lock hook engages with the fixing pin. 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 an end of the front support frame away from the backrest bracket, and the rear wheel is installed at an end of the rear support frame away from the backrest bracket.

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