CN115350011A - folding wheelchair - Google Patents

Abstract

The application provides a folding wheelchair, which relates to the technical field of medical devices, and is used to solve the technical problem that the existing folding wheelchair is easy to unfold in the folded state and affects the user experience. , rear support frame; the lock hook mechanism includes a lock hook and a first limit shaft; the lock hook includes a body, the body is rotatably connected to the backrest bracket, the body is provided with a first limit hook groove, and the first limit shaft is fixed on the rear support on the frame; the locking hook is configured such that when the rear support frame and the backrest bracket rotate in opposite directions and the folding wheelchair is in the folded state, the first limiting hook slot engages with the first limiting shaft. The folding wheelchair provided by the present application can prevent the folding wheelchair from unfolding in a folded state, thereby improving user experience.

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 populations such as the disabled, elderly and infirm, and medical and clinical rehabilitation patients. Because they can be folded, they are easy to carry and take up less space, they are widely used.

Existing folding wheelchairs include a backrest bracket and a rear support frame. The rear support frame is usually used to install rear wheels. A locking mechanism is arranged between the rear support frame and the backrest bracket. The locking mechanism is used to lock the folding wheelchair when it is in an unfolded state. In order to prevent the backrest bracket from detaching from the rear support frame, and improve the stability of the folding wheelchair in the unfolded state. However, the above-mentioned folding wheelchair is easy to unfold in the folded state, which affects user experience.

Contents of the invention

The purpose of the present application is to provide a folding wheelchair, which can prevent the phenomenon that the folding wheelchair is easily unfolded in a folded state, thereby improving user experience.

In order to achieve the above purpose, the embodiment of the present application provides the following technical solutions:

A folding wheelchair provided by an embodiment of the present application includes a lock hook mechanism, a backrest bracket and a rear support frame that are rotatably connected; the lock hook mechanism includes a lock hook and a first limit shaft; the lock hook includes a body, the The main body is rotatably connected to the backrest bracket, the main body is provided with a first limit hook groove matched with the first limit shaft, and the first limit shaft is fixed on the rear support frame; the The locking hook is configured such that when the rear support frame and the backrest bracket rotate toward each other and the folding wheelchair is in a folded state, the first limiting hook slot engages with the first limiting shaft.

In a possible implementation manner, the hook mechanism further includes a second limit shaft, and the second limit shaft is fixed on the rear support frame; the second limit shaft is connected to the first The limit shafts are arranged at intervals, and the body is provided with a second limit hook slot that cooperates with the second limit shaft; the lock hook is configured to rotate against each other when the rear support frame and the backrest support, and When the folding wheelchair is in an unfolded state, the second limiting hook groove is engaged with the second limiting shaft.

In a possible implementation manner, the lock hook mechanism includes an elastic member; the elastic member is arranged between the body and the backrest bracket, and the elastic member is configured to provide a locking force to the lock hook .

In a possible implementation manner, the hook mechanism further includes a second limit shaft, and the second limit shaft is fixed on the rear support frame; the second limit shaft is connected to the first The limit shafts are arranged at intervals, and the body is provided with a second limit hook slot that cooperates with the second limit shaft; the lock hook is configured to rotate against each other when the rear support frame and the backrest support, and When the folding wheelchair is in an unfolded state, the second limiting hook groove is engaged with the second limiting shaft.

In a possible implementation manner, the body is provided with an abutment portion, and the backrest bracket is provided with a limit surface that cooperates with the abutment portion; the abutment portion is configured such that the folding wheelchair is in a folded state Or in the unfolded state, the abutting portion is in contact with the limiting surface body, and limits the rotation angle of the locking hook relative to the backrest bracket.

In a possible implementation manner, the backrest bracket is provided with a limiting protrusion; the limiting protrusion is arranged opposite to the abutment portion, and the limiting protrusion faces one side of the abutting portion It has the limiting surface.

In a possible implementation manner, the lock hook further includes a wrench; the wrench is arranged on the side of the abutting portion away from the limit surface, and there is a rotation space between the wrench and the backrest support .

In a possible implementation manner, the body is provided with a rotating shaft installation hole; the backrest bracket is provided with a rotating shaft, and the body is sleeved on the rotating shaft through the rotating shaft installation hole; the first limit The hook groove and the second limiting hook groove are arranged opposite to the rotating shaft installation hole, and are respectively located on both sides of the rotating shaft installation hole.

In a possible implementation manner, the elastic member is a torsion spring; the torsion spring is sleeved on the rotating shaft, one end of the torsion spring is connected to the backrest bracket, and the other end of the torsion spring is connected to the The body is connected; the torsion spring is configured so that its elastic force acts on the body, and makes the locking hook rotate relative to the backrest bracket.

In a possible implementation manner, there are first hook body and second hook body on both sides of the body respectively; the first limit hook groove is formed between the first hook body and the body, so The second limiting hook groove is formed between the second hook body and the body; the first hook body and the second hook body extend obliquely relative to the body, and both extend in opposite directions.

In a possible implementation manner, the body is provided with a first guide surface at a position close to the first hook body, and the locking hook is configured such that when the backrest bracket and the rear support bracket rotate in opposite directions, the The first limit shaft is in contact with the first guide surface, and slides along the first guide surface into the first limit hook groove; the position of the body close to the second hook body is provided with a second guide surface, and the lock hook is configured such that when the backrest bracket and the rear support frame rotate in opposite directions, the second limit shaft contacts the second guide surface and slides along the second guide surface to The second limit hook slot.

In a possible implementation manner, the lock hook mechanism includes two lock hooks arranged symmetrically and a linkage link connecting the two lock hooks.

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

The foldable wheelchair provided by the embodiment of the present application includes a backrest support, a rear support frame that is rotatably connected, and a lock hook mechanism arranged between the back support support and the rear support frame. The lock hook mechanism includes a lock hook and a first limit shaft. The limit shaft is arranged on the rear support frame. The locking hook includes a body that rotates relative to the backrest bracket. The body is provided with a first limit hook groove that fits with the first limit shaft.

Further, when the backrest bracket and the rear support frame are rotated relative to each other so that the folding wheelchair is in the folded state, at this time, the lock hook is engaged to the first limiting shaft through its first limiting hook slot, so that the backrest bracket and the rear support can be racks locked together. With such arrangement, the locking hook mechanism can lock the folding wheelchair in the folded state, so as to avoid the phenomenon that the backrest bracket and the rear support frame are unfolded in the folded state and affect the user experience.

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

Description of drawings

FIG. 1 is a schematic diagram of the overall structure of a folding wheelchair provided in an embodiment of the present application in a folded state;

Figure 2 is a front view of the folding wheelchair provided in the embodiment of the present application in a folded state;

Fig. 3 is a schematic diagram of the mechanism of the folding wheelchair provided by the embodiment of the present application in a folded state;

Figure 4 is an enlarged schematic view of A in Figure 2;

Fig. 5 is a schematic structural diagram of the hook mechanism provided by the embodiment of the present application;

Fig. 6 is a schematic structural diagram of the locking hook in Fig. 5;

Fig. 7 is a schematic diagram of the overall structure of the folding wheelchair provided in the embodiment of the present application in an unfolded state;

Fig. 8 is a front view of the folding wheelchair provided by the embodiment of the present application in an unfolded state;

Fig. 9 is a schematic diagram of the mechanism of the folding wheelchair provided by the embodiment of the present application in the unfolded state;

FIG. 10 is an enlarged schematic diagram of point B in FIG. 8 .

Reference signs:

10 - front support frame;

11 - front wheel;

20 - backrest support;

30 - rear support frame;

31-rear wheel; 32-the first limit shaft; 33-the second limit shaft;

40 - bracket connecting rod;

50-seat link;

60 - seat bracket;

70 - armrest;

80-pedal;

90-hook mechanism;

91 - locking hook;

911-body; 912-first limit hook groove; 913-second limit hook groove; 914-contact portion; 915-first hook body; 916-second hook body; 917-wrench; hole;

92-link rod;

93 - Elastic member.

Detailed ways

As described in the background technology, the folding wheelchairs in the prior art are easy to unfold when they are in the folded state, which affects the user experience. The inventors have found that the reason for this problem is that the existing folding wheelchairs include a backrest bracket and a rear seat. There is a locking mechanism between the support frame, the rear support frame and the backrest bracket. The locking mechanism is only used to lock the folding wheelchair when it is in the unfolded state, and cannot lock the folding wheelchair in the folded state, resulting in the backrest bracket in the folded state Easy to separate from the rear support frame.

In view of the above-mentioned technical problems, an embodiment of the present application provides a folding wheelchair. A locking hook mechanism is provided between the backrest bracket and the rear support frame. The locking hook mechanism includes a locking hook and a first limit shaft, and the first limit shaft It is arranged on the rear support frame, and the locking hook includes a body that rotates relative to the backrest bracket, and the body is provided with a first limit hook groove that fits with the first limit shaft. When the backrest bracket and the rear support frame are rotated relative to each other so that the folding wheelchair is in the folded state, the lock hook is engaged to the first limit shaft by its first limit hook groove, so that the backrest support and the rear support frame can be locked in the folded state. Together. With such arrangement, the locking hook mechanism can lock the folding wheelchair in the folded state, so as to prevent the phenomenon that the backrest bracket and the rear support frame of the folding wheelchair are unfolded in the folded state, thereby affecting the user experience.

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 in conjunction with the drawings in the embodiments of the present application. Apparently, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

As shown in Figures 1 to 4, and referring to Figures 7 and 9; the folding wheelchair provided by the embodiment of the present application includes a front support frame 10, a back support frame 20, an armrest 70, a front wheel 11, a rear wheel 31, and a rear support frame 30 , bracket connecting rod 40, seat bracket 60, seat connecting rod 50 and pedal 80. Wherein, the front support frame 10, the back support frame 20, the rear support frame 30 and the support link 40 are hinged together to form a foldable and deformable first link mechanism.

The front support frame 10, the backrest bracket 20, the seat frame 60, and the seat link 50 are hinged together to form a second link mechanism that can be folded and deformed, and the second link mechanism is linked with the first link mechanism to During the unfolding or folding process of the folding wheelchair, the seat frame 60 is folded or unfolded accordingly.

Specifically, the front support frame 10 is used to install the front wheels 11, also known as a front wheel support, and the pedal 80 is also installed on 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 wheel 31, also known as the rear wheel support.

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 support frame 60 and the rear support frame 30 , 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 respectively rotatably connected to the second mounting portion of the backrest bracket 20, and can rotate relative to the backrest bracket 20.

A support link 40 is arranged between the rear support frame 30 and the front support frame 10, and the two ends of the support 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 support 20, the rear support frame The frame 30 and the bracket link 40 are rotatably connected to each other and form pivot points a, b, c, d to form a collapsible and deformable first linkage mechanism to realize the folding of the front support frame 10, rear support frame 30, The folding of backrest support 20. When the folding wheelchair is in the unfolded state, the backrest bracket 20 and the rear support frame 30 are mutually limited and supported, thereby forming a stable triangular structure of pivot points a, c, and d.

The above-mentioned seat link 50 is used to connect the seat frame 60 and the front support frame 10, wherein one end of the seat link 50 is hinged with the seat frame 60, and the other end of the seat link 50 is hinged with the front support frame 10, namely 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 the hinge points e, f, g, a to form a foldable and deformable second link mechanism to realize folding The seat bracket 60 is folded along with the wheelchair during the folding and unfolding process.

On the basis of the above-mentioned embodiments, the folding wheelchair provided by the embodiment of the present application further includes a locking hook mechanism 90, which is arranged between the backrest bracket 20 and the rear support frame 30, and the locking hook mechanism 90 is used to lock the folding wheelchair in When in the folded state, the backrest support 20 and the rear support frame 30 are locked to prevent separation of the two.

As shown in Figures 5 and 6, the locking hook mechanism 90 includes a locking hook 91 and a first limit shaft 32, wherein the locking hook 91 is rotatably connected to the backrest bracket 20, and the locking hook 91 includes a body 911, which is rotatably connected to the The inner side of the backrest support 20.

For example, a rotating shaft is fixedly arranged on the backrest bracket 20, and the body 911 is provided with a rotating shaft installation hole 918. 20 turns.

Further, the rotating shaft and the rotating shaft installation hole 918 can be tightly fitted, and the rotation damping between the two is relatively large, so that the locking hook 91 can be kept on the backrest bracket 20 without being subjected to external force, preventing The locking hook 91 rotates arbitrarily on the back support 20 . When the folding wheelchair is in the folded state, the operator can manually rotate the lock hook 91 so that the lock hook 91 can lock the backrest bracket 20 and the rear support frame 30 .

Further, the body 911 is also provided with a first limiting hook groove 912 , and the first limiting hook groove 912 is used to engage with the first limiting shaft 32 . The first limit shaft 32 is fixed on the rear support frame 30 near one end of the back support bracket 20, the first limit shaft 32 can be a fixed pin fixed on the rear support frame 30, and the fixed pin cooperates with the first limit hook groove 912. So that when the folding wheelchair is in the folded state, the fixing pin can be embedded in the first limiting hook groove 912 .

In this way, when the folding wheelchair is fully folded, the first limiting shaft 32 can be snapped into the first limiting hook groove 912, thereby realizing the restraint of the backrest bracket 20 and the rear support frame 30, preventing the backrest bracket 20 from being connected to the rear support frame. 30 are separated from each other around the pivot point b, that is to further improve the locking reliability of the backrest bracket 20 and the rear support frame 30 when the folding wheelchair is in the folded state. Compared with the prior art, the folding wheelchair provided by the embodiment of the present application can lock the folding wheelchair in the folded state, so as to avoid the phenomenon that the folding wheelchair is unfolded in the folded state and affects the user experience.

On the basis of the above embodiments, the hook mechanism provided by the embodiment of the present application further includes an elastic member 93 disposed between the body 911 and the backrest support 20 , and the elastic member 93 can provide elastic force for the body 911 . One end of the elastic piece 93 is connected with the backrest bracket 20, and the other end of the elastic piece 93 is connected with the body 911. Under the abutment of the backrest bracket 20, the elastic force of the elastic piece 93 acts on the body 911, so that the body 911 is relatively The back support 20 rotates.

Exemplarily, the elastic member 93 provided in the embodiment of the present application may be a torsion spring, which is sleeved on the rotating shaft, one end of the torsion spring is connected to the back support 20 , and the other end of the torsion spring is connected to the body 911 . For example, the backrest bracket 20 is provided with a mounting hole, and one end of the torsion spring is inserted into the mounting hole; the other end of the torsion spring is bent to form a bending hook, and the torsion spring is clamped on the body 911 through the bending hook, and then twisted. The spring can act on the main body 911 with its elastic force, and make the locking hook 91 rotate relative to the back support bracket 20 .

Further, the main body 911 is provided with an abutting portion 914 for abutting against the back support bracket 20 . The elastic force provided by the elastic member 93 in the embodiment of the present application can make the lock hook 91 have a rotation force in the counterclockwise direction, so that the lock hook 91 has a certain rotation angle. Under the action of the elastic member 93 , the locking hook 91 can abut against the backrest bracket 20 to realize the hard limit of both, so that the locking hook 91 maintains a certain posture on the backrest bracket 20 .

In one embodiment, along the axial direction of the shaft installation hole 918 of the main body 911, the abutting portion 914 is located on one side of the main body 911, so that the abutting portion 914 abuts against the backrest bracket 20, and the first limit hook The slot 912 and the second limiting hook slot 913 are located inside the back support bracket 20 .

Correspondingly, the backrest bracket 20 is provided with a limiting surface that cooperates with the abutting portion 914. Preferably, the abutting portion 914 has a horizontal abutting surface on the side facing the limiting surface, so that the limiting surface can be in contact with the abutting portion 914. Together, that is, the limit surface is also a horizontal abutment surface. When the folding wheelchair is in the folded state or unfolded state, the abutting portion 914 of the lock hook 91 is in contact with the limiting surface on the backrest bracket 20 .

For example, the backrest bracket 20 is provided with a limiting protrusion, and the limiting protrusion is arranged opposite to the abutting portion 914 of the lock hook 91, and a limiting surface is provided on the side of the limiting protrusion facing the abutting portion 914, and the limiting surface For the horizontal contact surface. In this way, the position-limiting projection of the backrest bracket 20 and the abutting portion 914 use a plane as the abutting surface, which can improve the abutment reliability between the backrest bracket 20 and the main body 911 of the locking hook 91 .

Such setting can limit the installation angle of the locking hook 91 on the backrest bracket 20, and also limit the range of rotation angles of the locking hook 91. A certain posture is maintained on the backrest bracket 20, so that the reliability of the first limit hook groove 912 of the lock hook 91 being engaged with the first limit shaft 32 can be improved, and the lock hook 91 can be prevented from having any rotation angle, which will cause the first stop. The phenomenon that the limiting hook groove 912 cannot be engaged with the first limiting shaft 32 occurs.

Exemplarily, when the folding wheelchair needs to be folded, the back support frame 20 and the rear support frame 30 rotate toward each other, that is, the ends of the back support frame 20 and the rear support frame 30 away from the rotation centers of the two are gradually approached. As the folding wheelchair gradually tends to the fully folded state, the first limiting shaft 32 first abuts against the body 911 ; under the thrust of the rear support frame 30 , the locking hook 91 can overcome the elastic force of the torsion spring and rotate clockwise.

When the folding wheelchair is fully folded, the first limiting shaft 32 can be snapped into the first limiting hook groove 912 , and the locking hook 91 and the first limiting shaft 32 are locked under the action of the torsion spring. At this time, the lock hook 91 rotates counterclockwise under the action of the torsion spring and resets, and the body 911 of the lock hook 91 abuts against the backrest bracket 20, so that the two are in a hard limit state, effectively preventing the first limit hook groove 912 from moving from the backrest bracket 20. The first limit shaft 32 is disengaged, thereby realizing the restraint of the backrest bracket 20 and the rear support frame 30, preventing the backrest bracket 20 and the rear support frame 30 from being separated from each other around the pivot point b, that is, further lifting the folding wheelchair and being in the folded state. The locking reliability of the bracket 20 and the rear support frame 30.

On the basis of the above-mentioned embodiments, the locking hook mechanism 90 provided by the embodiment of the present application can not only lock the backrest bracket 20 and the rear support frame 30 in the folded state, but also can lock the backrest bracket 20 and the rear support frame in the unfolded state. The frame 30 is locked.

As shown in FIGS. 7 to 10 , the lock hook mechanism 90 provided by the embodiment of the present application also includes a second limit shaft 33 , and the second limit shaft 33 is fixed on one end of the rear support frame 30 close to the back support bracket 20 , and the second limit shaft 33 The limiting shaft 33 is spaced apart from the first limiting shaft 32 . Correspondingly, the body 911 is also provided with a second limit hook groove 913 that cooperates with the second limit shaft 33, and when the folding wheelchair is in the unfolded state, the second limit hook groove 913 can be engaged with the second limit shaft 33 close, and then realize the locking of the backrest bracket 20 and the rear support frame 30 when the folding wheelchair is in the unfolded state.

Exemplarily, when the folding wheelchair needs to be unfolded, the back support frame 20 and the rear support frame 30 rotate oppositely, that is, the ends of the back support frame 20 and the rear support frame 30 away from the rotation centers of the two are gradually moved away. As the folding wheelchair gradually tends to the fully unfolded state, the second limit shaft 33 first abuts against the body 911; under the thrust of the rear support frame 30, the locking hook 91 can overcome the elastic force of the torsion spring and rotate clockwise.

When the folding wheelchair is fully unfolded, the second limiting shaft 33 can be snapped into the second limiting hook groove 913 , and the locking hook 91 and the second limiting shaft 33 are locked under the action of the torsion spring. At this time, the lock hook 91 rotates counterclockwise under the action of the torsion spring and resets, and the body 911 of the lock hook 91 abuts against the backrest bracket 20, so that the two are in a hard limit state, effectively preventing the first limit hook groove 912 from moving from the backrest bracket 20. disengage from the first limit shaft 32. In this way, the restraint of the back support frame 20 and the rear support frame 30 can be realized, preventing the back support frame 20 and the rear support frame 30 from being separated from each other around the pivot point b; reliability.

It should be noted that the second limit hook groove 913 and the first limit hook groove 912 are arranged opposite to the shaft installation hole 918 of the body 911 , and the first limit hook groove 912 and the second limit hook groove 913 are located on the body 911 respectively. on both sides.

For example, the first limit hook groove 912 is located on the first side of the body 911, and the second limit hook groove 913 is located on the second side of the body 911. When the folding wheelchair is in the folded state, the first side of the body 911 is close to the first limit. The positioning shaft 32 , the first limiting hook groove 912 located on the first side can be engaged with the first limiting shaft 32 .

Conversely, when the folding wheelchair is in the unfolded state, due to the change of the angle between the backrest bracket 20 and the rear support frame 30, the second side of the body 911 is close to the second limiting shaft 33, and the second limiting hook on the second side The slot 913 can be engaged with the second limiting shaft 33 .

Further, a first hook body 915 is provided on the first side of the body 911 , the first hook body 915 extends obliquely relative to the body 911 , and a first limiting hook groove 912 is formed between the first hook body 915 and the body 911 . Correspondingly, a second hook body 916 is provided on the second side of the body 911 , and the second hook body 916 extends obliquely relative to the body 911 , and a second limiting hook groove 913 is formed between the second hook body 916 and the body 911 .

The first hook body 915 and the second hook body 916 extend in opposite directions relative to the main body 911. For example, when the folding wheelchair is in the unfolded or folded state, a locking hook 91 can be used to connect with the first limiting shaft 32 and the second locking shaft 32 respectively. The two limit shafts 33 are clamped.

Based on the above implementation, the first side of the body 911 is further provided with a first guide surface, and the first guide surface and the first hook body 915 are located on the same side of the body 911 . The first guide surface can extend into the first limit groove. When the folding wheelchair is folded, the backrest bracket 20 and the rear support frame 30 rotate in opposite directions, and when the folding wheelchair tends to be fully folded, the first guide surface can be aligned with the folding wheelchair. The first limiting shaft 32 contacts, and under the thrust of the rear support frame 30, the first limiting shaft 32 moves toward the first limiting hook groove 912 along the first guide surface until the first limiting shaft 32 engages with the Inside the first limiting hook groove 912.

Similarly, the second side of the body 911 is further provided with a second guide surface, and the second guide surface is located on the same side of the body 911 as the second hook body 916 . The second guide surface can extend into the second limit hook groove 913. When the folding wheelchair is unfolded, the backrest bracket 20 and the rear support frame 30 rotate oppositely, and when the folding wheelchair tends to be fully unfolded, the second guide surface Can be in contact with the second limit shaft 33, and under the thrust of the rear support frame 30, the second limit shaft 33 moves toward the second limit hook groove 913 along the second guide surface until the second limit shaft 33 is locked fit into the second limiting hook groove 913.

On the basis of the above embodiments, the lock hook 91 provided in the embodiment of the present application further includes a wrench 917 fixed on the body 911 . The wrench 917 is disposed on a side of the abutting portion 914 of the body 911 away from the limiting surface. When the locking hook 91 locked the backrest bracket 20 and the rear support frame 30, there was an operating space between the wrench 917 and the backrest bracket 20, so that the wrench 917 was operated, so that the locking hook 91 was rotated, and then the first locking hook 91 was rotated. The limiting groove escapes from the first limiting shaft 32 , or the second limiting hook groove 913 escapes from the second limiting shaft 33 .

For example, when the folding wheelchair is in the unfolded state, the abutting portion 914 of the locking hook 91 abuts against the limiting projection of the backrest bracket 20, and the second limiting hook groove 913 of the locking hook 91 is engaged to the second limiting position. On the shaft 33 , since the locking hook 91 abuts against the back support bracket 20 through the abutting portion 914 and the limiting protrusion, the locking hook 91 cannot rotate counterclockwise.

When the folding wheelchair is folded, it is necessary to contact the limit state between the lock hook 91 and the backrest bracket 20, and a turning force can be applied to the wrench 917 so that the lock hook 91 rotates clockwise, so that the second limit position of the lock hook 91 The hook groove 913 is disengaged from the second limiting shaft 33 to release the locked state between the backrest bracket 20 and the rear support frame 30 .

On the basis of the above-mentioned embodiments, the lock hook mechanism 90 provided by the embodiment of the present application includes two lock hooks 91 and a linkage rod 92, wherein the linkage rod 92 is arranged between the two lock hooks 91, and the two ends of the linkage rod 92 are respectively Connected with the two locking hooks 91, the linkage rod 92 can drive the two locking hooks 91 to act synchronously.

Exemplarily, two locking hooks 91 are respectively provided on the left and right sides of the folding wheelchair, and the two locking hooks 91 are connected together by a linkage rod 92 . When the folding wheelchair needs to be folded or unfolded, the locking hook mechanism 90 can be unlocked by operating the wrench 917 on the locking hook 91 on one side of the folding wheelchair, so as to improve user experience.

Further, when the folding wheelchair is in the folded state, and the backrest bracket 20 and the rear support frame 30 of the folding wheelchair need to be unlocked, since the wrench 917 is in the folding space of the folding wheelchair, it is inconvenient to operate. Therefore, a downward force can be applied to the linkage rod 92, and this downward force is converted into the rotational force of the lock hook 91, and the lock hook 91 is rotated relative to the backrest bracket 20, and the first limit hook groove 912 of the lock hook 91 is moved from the first position limit The shaft 32 is disengaged to release the locked state between the backrest bracket 20 and the rear support frame 30, so that the user can easily unlock the folding wheelchair in the folded state to improve user experience.

Each embodiment or implementation manner in this specification is described in a progressive manner, each embodiment focuses on the differences from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

It should be noted that references in the specification to "one embodiment," "an embodiment," "exemplary embodiment," "some embodiments," etc. mean that the described embodiments may include particular features, structures, or characteristics, but not necessarily Each embodiment includes that 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 conjunction with an embodiment, it is within the purview of those skilled in the art to implement such feature, structure, or characteristic in conjunction with other embodiments that are explicitly or not explicitly described.

In general, terms should be understood at least in part by contextual usage. 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 the context . Similarly, terms such as "a" or "the" may also be understood to convey singular usage or to convey plural usage, depending at least in part on context.

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

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 it; although the application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to 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 make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present application. scope.

Claims (11)

1. A folding wheelchair, characterized in that it comprises a lock hook mechanism and a backrest support and a rear support frame that are rotatably connected; The lock hook mechanism includes a lock hook and a first limit shaft; the lock hook includes a body, the body is rotatably connected to the backrest bracket, and the body is provided with a first limit shaft that cooperates with the first limit shaft. A limit hook groove, the first limit shaft is fixed on the rear support frame; The lock hook is configured such that when the rear support frame and the backrest bracket rotate toward each other and the folding wheelchair is in a folded state, the first limiting hook slot engages with the first limiting shaft. 2. The folding wheelchair according to claim 1, wherein the hook mechanism comprises an elastic member; The elastic member is disposed between the body and the backrest bracket, and the elastic member is configured to provide locking force to the locking hook. 3. The folding wheelchair according to claim 2, wherein the hook mechanism further comprises a second limiting shaft, and the second limiting shaft is fixed on the rear support frame; The second limiting shaft is spaced apart from the first limiting shaft, and the body is provided with a second limiting hook groove that cooperates with the second limiting shaft; The locking hook is configured such that when the rear support frame and the backrest bracket rotate in opposite directions and the folding wheelchair is in an unfolded state, the second limiting hook slot engages with the second limiting shaft . 4. The folding wheelchair according to claim 3, wherein the body is provided with an abutment portion, and the backrest bracket is provided with a limiting surface that cooperates with the abutment portion; The abutment part is configured such that when the folding wheelchair is in a folded state or an unfolded state, the abutment part fits with the limiting surface body and limits the rotation angle of the lock hook relative to the backrest bracket. 5. The folding wheelchair according to claim 4, wherein the backrest bracket is provided with a limiting protrusion; The limiting protrusion is disposed opposite to the abutting portion, and a side of the limiting protrusion facing the abutting portion has the limiting surface. 6. The folding wheelchair according to claim 4, wherein the locking hook further comprises a wrench; The wrench is disposed on a side of the abutting portion away from the limiting surface, and there is a rotation space between the wrench and the backrest bracket. 7. The folding wheelchair according to claim 3, wherein the body is provided with a shaft installation hole; The backrest bracket is provided with a rotating shaft, and the body is sleeved on the rotating shaft through the rotating shaft installation hole; The first limiting hook groove and the second limiting hook groove are arranged opposite to the rotating shaft installation hole, and are respectively located on both sides of the rotating shaft installation hole. 8. The folding wheelchair according to claim 7, wherein the elastic member is a torsion spring; The torsion spring is sleeved on the rotating shaft, one end of the torsion spring is connected to the backrest bracket, and the other end of the torsion spring is connected to the body; The torsion spring is configured such that its elastic force acts on the body and makes the locking hook rotate relative to the backrest bracket. 9. The folding wheelchair according to claim 6, characterized in that there are first hooks and second hooks on both sides of the body; The first limit hook groove is formed between the first hook body and the body, and the second limit hook groove is formed between the second hook body and the body; The first hook body and the second hook body extend obliquely relative to the body, and the two extend in opposite directions. 10. The folding wheelchair according to claim 9, wherein a first guide surface is provided at a position close to the first hook body of the body, and the lock hook is configured as a joint between the backrest support and the rear support. When the frames rotate in opposite directions, the first limiting shaft contacts the first guiding surface and slides into the first limiting hook groove along the first guiding surface; The body is provided with a second guide surface at a position close to the second hook body, and the lock hook is configured such that when the backrest bracket and the rear support frame rotate oppositely, the second limit shaft and the The second guiding surface contacts and slides into the second limiting hook groove along the second guiding surface. 11. The folding wheelchair according to any one of claims 1 to 10, wherein the hook mechanism comprises two symmetrically arranged locking hooks and a linkage link connecting the two locking hooks.

Images