Folding wheelchair

Abstract

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

Description

Technical Field

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

[0002] Folding wheelchairs are a means of transportation for special groups of people, such as the disabled, the elderly and the weak, as well as patients undergoing medical clinical rehabilitation. They are widely used because they can be folded, are easy to carry and take up little space.

[0003] The existing folding wheelchair includes a backrest bracket and a rear support frame, the rear support frame is usually used to install the rear wheels, and a locking mechanism is provided between the rear support frame and the backrest bracket, which is used to lock the folding wheelchair in the unfolded state to prevent the backrest bracket from being separated from the rear support frame, thereby improving the stability of the folding wheelchair in the unfolded state. However, the above folding wheelchair is easy to unfold in the folded state, which affects the user experience. Summary of the invention

[0004] The purpose of the present application is to provide a foldable wheelchair that can prevent the foldable wheelchair from easily unfolding in a folded state, thereby improving the user experience.

[0005] In order to achieve the above objectives, the embodiments of the present application provide the following technical solutions:

[0006] A folding wheelchair provided in an embodiment of the present application comprises a locking hook mechanism and a backrest bracket and a rear support frame which are rotatably connected; the locking hook mechanism comprises a locking hook and a first limiting shaft; the locking hook comprises a main body which is rotatably connected to the backrest bracket, the main body being provided with a first limiting hook groove which cooperates with the first limiting shaft, and the first limiting shaft being fixed to the rear support frame; the locking hook is configured such that when the rear support frame and the backrest bracket rotate towards each other and the folding wheelchair is in a folded state, the first limiting hook groove is engaged with the first limiting shaft.

[0007] In a possible implementation, the locking hook mechanism also includes a second limiting shaft, which is fixed to 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 so that when the rear support frame and the backrest bracket rotate away from each other and the folding wheelchair is in an unfolded state, the second limiting hook groove is engaged with the second limiting shaft.

[0008] In a possible implementation, the locking hook mechanism includes an elastic member; the elastic member is disposed between the body and the backrest bracket, and the elastic member is configured to provide a locking force to the locking hook.

[0009] In a possible implementation, the locking hook mechanism also includes a second limiting shaft, which is fixed to 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 so that when the rear support frame and the backrest bracket rotate away from each other and the folding wheelchair is in an unfolded state, the second limiting hook groove is engaged with the second limiting shaft.

[0010] In a possible implementation, the main 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 portion is configured so that when the folding wheelchair is in a folded state or an unfolded state, the abutment portion fits with the limiting surface body and limits the rotation angle of the locking hook relative to the backrest bracket.

[0011] In a possible implementation, the backrest bracket is provided with a limiting protrusion; the limiting protrusion is arranged opposite to the abutting portion, and the limiting protrusion has the limiting surface on a side facing the abutting portion.

[0012] In a possible implementation, the locking hook further includes a wrench; the wrench is arranged on a side of the abutting portion away from the limiting surface, and a rotation space is provided between the wrench and the backrest bracket.

[0013] In a possible implementation, the main body is provided with a rotating shaft mounting hole; the backrest bracket is provided with a rotating shaft, and the main body is sleeved on the rotating shaft through the rotating shaft mounting hole; the first limiting hook groove and the second limiting hook groove are arranged relative to the rotating shaft mounting hole, and are respectively located on both sides of the rotating shaft mounting hole.

[0014] In a possible implementation, 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 main body; the torsion spring is configured so that its elastic force acts on the main body and causes the locking hook to rotate relative to the backrest bracket.

[0015] In a possible implementation, a first hook body and a second hook body are respectively provided on both sides of the main body; the first limiting hook groove is formed between the first hook body and the main body, and the second limiting hook groove is formed between the second hook body and the main body; the first hook body and the second hook body extend obliquely relative to the main body, and the extension directions of the two are opposite.

[0016] In one possible implementation, a first guide surface is provided at a position of the main body close to the first hook body, and the locking hook is configured so that when the backrest bracket and the rear support frame rotate toward each other, the first limiting shaft contacts the first guide surface and slides along the first guide surface into the first limiting hook groove; a second guide surface is provided at a position of the main body close to the second hook body, and the locking hook is configured so that when the backrest bracket and the rear support frame rotate away from each other, the second limiting shaft contacts the second guide surface and slides along the second guide surface into the second limiting hook groove.

[0017] In a possible implementation, the locking hook mechanism includes two symmetrically arranged locking hooks and a linkage rod connecting the two locking hooks.

[0018] Compared with the related art, the folding wheelchair provided in the embodiment of the present application has the following advantages:

[0019] The folding wheelchair provided in the embodiment of the present application includes a backrest bracket and a rear support frame that are rotatably connected, and a locking hook mechanism arranged between the backrest bracket and the rear support frame, the locking hook mechanism includes a locking hook and a first limiting shaft, the first limiting shaft is arranged on the rear support frame, the locking hook includes a main body that rotates relative to the backrest bracket, and the main body is provided with a first limiting hook groove that cooperates with the first limiting shaft.

[0020] Furthermore, when the backrest bracket and the rear support bracket rotate towards each other so that the folding wheelchair is in the folded state, the lock hook is engaged with the first limit axis through its first limit hook groove, and the backrest bracket and the rear support bracket can be locked together. In this way, the lock hook mechanism can lock the folding wheelchair in the folded state, preventing the backrest bracket and the rear support bracket from unfolding in the folded state, which affects the user experience.

[0021] In addition to the technical problems solved by the embodiments of the present disclosure, the technical features that constitute the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that can be solved by the folding wheelchair provided by the embodiments of the present application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the overall structure of the foldable wheelchair in a folded state provided in an embodiment of the present application;

[0023] Figure 2 A front view of a foldable wheelchair in a folded state provided by an embodiment of the present application;

[0024] Figure 3 A schematic diagram of the mechanism of the foldable wheelchair provided in an embodiment of the present application in a folded state;

[0025] Figure 4 for Figure 2 The enlarged schematic diagram at A in the middle;

[0026] Figure 5 A schematic diagram of the structure of the locking hook mechanism provided in an embodiment of the present application;

[0027] Figure 6 for Figure 5 A schematic diagram of the structure of the lock hook;

[0028] Figure 7 A schematic diagram of the overall structure of the foldable wheelchair in the unfolded state provided by an embodiment of the present application;

[0029] Figure 8 A front view of a foldable wheelchair in an unfolded state provided by an embodiment of the present application;

[0030] Fig. 9 A schematic diagram of the mechanism of the foldable wheelchair provided in an embodiment of the present application in an unfolded state;

[0031] Fig.10 for Figure 8 Enlarged schematic diagram of point B in the middle.

[0032] Reference numerals:

[0033] 10-Front support frame;

[0034] 11-Front wheel;

[0035] 20-backrest support;

[0036] 30- rear support frame;

[0037] 31-rear wheel; 32-first limiting axis; 33-second limiting axis;

[0038] 40-bracket connecting rod;

[0039] 50-seat link;

[0040] 60-seat support;

[0041] 70-handrails;

[0042] 80-pedal;

[0043] 90-lock hook mechanism;

[0044] 91-lock hook;

[0045] 911-body; 912-first limit hook groove; 913-second limit hook groove; 914-abutment portion; 915-first hook body; 916-second hook body; 917-wrench; 918-shaft mounting hole;

[0046] 92- linkage rod;

[0047] 93-Elastic parts. DETAILED DESCRIPTION

[0048] As described in the background technology, the folding wheelchair in the prior art is easy to unfold when it is in a folded state, which affects the user experience. The inventors have found that the reason for this problem is that the existing folding wheelchair includes a backrest bracket and a rear support frame, and a locking mechanism is provided between the rear support frame and the backrest bracket. The locking mechanism is only used to lock the folding wheelchair in an unfolded state, and cannot lock the folding wheelchair in a folded state, resulting in the backrest bracket and the rear support frame in the folded state being easily separated.

[0049] In view of the above technical problems, an embodiment of the present application provides a folding wheelchair, wherein a locking hook mechanism is provided between a backrest bracket and a rear support frame, the locking hook mechanism includes a locking hook and a first limiting shaft, the first limiting shaft is provided 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 limiting hook groove that cooperates with the first limiting shaft. When the backrest bracket and the rear support frame rotate toward each other so that the folding wheelchair is in a folded state, the locking hook is engaged with the first limiting shaft through its first limiting hook groove, and the backrest bracket and the rear support frame can be locked together. With such a configuration, the locking hook mechanism can lock the folding wheelchair in the folded state, and prevent the backrest bracket and the rear support frame of the folding wheelchair from unfolding in the folded state, thereby affecting the user experience.

[0050] In order to make the above-mentioned purposes, 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. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of this application.

[0051] like Figures 1 to 4 See Figure 7 and Fig. 9 The folding wheelchair provided in the embodiment of the present application comprises a front support frame 10, a backrest frame 20, an armrest 70, a front wheel 11, a rear wheel 31, a rear support frame 30, a support link 40, a seat frame 60, a seat link 50 and a footrest 80. The front support frame 10, the backrest frame 20, the rear support frame 30 and the support link 40 are hinged together to form a first link mechanism that can be folded and deformed.

[0052] The front support frame 10, the backrest support 20, the seat support 60, and the seat connecting rod 50 are hinged together to form a second connecting rod mechanism that can be folded and deformed, and the second connecting rod mechanism is linked with the first connecting rod mechanism to realize the seat support 60 to be folded or unfolded when the folding wheelchair is unfolded or folded.

[0053] Specifically, the front support frame 10 is used to install the front wheel 11, also known as the front wheel support, and the pedal 80 is also installed at the front end of the front support frame 10 to provide foot support for the user. The rear support frame 30 is used to install the rear wheel 31, also known as the rear wheel support.

[0054] The backrest bracket 20 includes a first mounting portion and a second mounting portion, and the first mounting portion is used to install the backrest cushion of the folding wheelchair, and the second mounting portion is used to connect with the front support frame 10, the seat bracket 60, and the rear support frame 30, and one end of the front support frame 10 away from the front wheel 11 and one end of the rear support frame 30 away from the rear wheel 31 can be rotatably connected to the second mounting portion of the backrest bracket 20 respectively, and can rotate relative to the backrest bracket 20.

[0055] A support link 40 is provided between the rear support frame 30 and the front support frame 10, and the two ends of the support link 40 are respectively hinged to 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 30, and the support link 40 are rotatably connected to each other and form pivot points a, b, c, and d to form a foldable and deformable first link mechanism to achieve the folding of the front support frame 10, the rear support frame 30, and the backrest support 20 of the folding wheelchair. When the folding wheelchair is in the unfolded state, the backrest support 20 and the rear support frame 30 limit and support each other, thereby forming a stable triangular structure of pivot points a, c, and d.

[0056] The above-mentioned seat connecting rod 50 is used to connect the seat bracket 60 and the front support frame 10, wherein one end of the seat connecting rod 50 is hinged to the seat bracket 60, and the other end of the seat connecting rod 50 is hinged to the front support frame 10, that is, the front support frame 10, the seat connecting rod 50, the seat bracket 60, and the backrest bracket 20 are hinged to each other and form a pivot point e, f, g, a to form a second connecting rod mechanism that can be folded and deformed, so as to realize the follow-up folding of the seat bracket 60 during the folding and unfolding process of the folding wheelchair.

[0057] On the basis of the above-mentioned embodiments, the folding wheelchair provided in the embodiment of the present application further includes a locking hook mechanism 90, which is disposed between the backrest bracket 20 and the rear support frame 30. The locking hook mechanism 90 is used to lock the backrest bracket 20 and the rear support frame 30 when the folding wheelchair is in a folded state to prevent the two from separating.

[0058] like Figure 5 and Figure 6As shown, the locking hook mechanism 90 includes a locking hook 91 and a first limiting shaft 32 , wherein the locking hook 91 is rotatably connected to the backrest bracket 20 , and the locking hook 91 includes a body 911 rotatably connected to the inner side of the backrest bracket 20 .

[0059] For example, a rotating shaft is fixedly provided on the backrest bracket 20, and a rotating shaft mounting hole 918 is provided on the main body 911. The rotating shaft mounting hole 918 is matched with the rotating shaft so that the locking hook 91 is sleeved on the rotating shaft through the rotating shaft mounting hole 918 and can rotate relative to the backrest bracket 20.

[0060] Furthermore, the rotating shaft and the rotating shaft mounting hole 918 may 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 when no external force is applied, and the locking hook 91 is prevented from rotating arbitrarily on the backrest bracket 20. When the foldable wheelchair is in the folded state, the operator can manually rotate the locking hook 91 so that the locking hook 91 can lock the backrest bracket 20 and the rear support frame 30.

[0061] Furthermore, 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 limiting shaft 32 is fixed to one end of the rear support frame 30 close to the backrest bracket 20, and the first limiting shaft 32 can be a fixing pin fixed to the rear support frame 30, and the fixing pin is matched with the first limiting hook groove 912 so that when the folding wheelchair is in a folded state, the fixing pin can be embedded in the first limiting hook groove 912.

[0062] With such a configuration, when the folding wheelchair is completely folded, the first limit axis 32 can be inserted into the first limit hook groove 912, thereby constraining 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 rotation axis point b, that is, further improving 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 in the embodiment of the present application can lock the folding wheelchair in the folded state, thereby preventing the folding wheelchair from unfolding in the folded state, which affects the user experience.

[0063] On the basis of the above-mentioned embodiment, the locking hook mechanism provided in the embodiment of the present application further includes an elastic member 93, which is disposed between the body 911 and the backrest bracket 20, and can provide elastic force for the body 911. One end of the elastic member 93 is connected to the backrest bracket 20, and the other end of the elastic member 93 is connected to the body 911. Under the abutment of the backrest bracket 20, the elastic force of the elastic member 93 acts on the body 911, so that the body 911 rotates relative to the backrest bracket 20.

[0064] For example, the elastic member 93 provided in the embodiment of the present application can be a torsion spring, which is sleeved on the rotating shaft, one end of which is connected to the backrest bracket 20, and the other end of which is connected to the body 911. For example, the backrest bracket 20 is provided with a mounting hole, one end of which is inserted into the mounting hole; the other end of the torsion spring is bent to form a bent hook, and the torsion spring is clamped on the body 911 through the bent hook, so that the torsion spring can exert its elastic force on the body 911 and make the locking hook 91 rotate relative to the backrest bracket 20.

[0065] Furthermore, the body 911 is provided with an abutment portion 914, which is used to abut against the backrest bracket 20. The elastic force provided by the elastic member 93 of the embodiment of the present application can make the lock hook 91 have a rotational force to rotate in the counterclockwise direction, so that the lock hook 91 has a certain rotation angle. Under the action of the elastic member 93, the lock hook 91 can abut against the backrest bracket 20 to achieve hard limit of the two, so that the lock hook 91 maintains a certain posture on the backrest bracket 20.

[0066] In one embodiment, along the axial direction of the shaft mounting hole 918 of the main body 911, the abutment portion 914 is located on one side of the main body 911 so that the abutment portion 914 abuts against the backrest bracket 20, and the first limiting hook groove 912 and the second limiting hook groove 913 are located on the inner side of the backrest bracket 20.

[0067] Correspondingly, the backrest bracket 20 is provided with a limiting surface that cooperates with the abutment portion 914. Preferably, the abutment portion 914 has a horizontal abutment surface on one side facing the limiting surface, so that the limiting surface can fit with the abutment portion 914, that is, the limiting surface is also a horizontal abutment surface. When the folding wheelchair is in a folded state or an unfolded state, the abutment portion 914 of the lock hook 91 fits with the limiting surface on the backrest bracket 20.

[0068] 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 one side of the limiting protrusion facing the abutting portion 914, and the limiting surface is a horizontal abutting surface. In this way, the limiting protrusion 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 body 911 of the lock hook 91.

[0069] Such a configuration can limit the installation angle of the lock hook 91 on the backrest bracket 20, and can also limit the rotation angle range of the lock hook 91, that is, when the backrest bracket 20 and the rear support frame 30 of the folding wheelchair rotate relative to each other, the lock hook 91 is maintained on the backrest bracket 20 in a certain posture, which can improve the reliability of the first limiting hook groove 912 of the lock hook 91 being engaged with the first limiting shaft 32, and prevent the lock hook 91 from having any rotation angle, which causes the first limiting hook groove 912 to fail to engage with the first limiting shaft 32.

[0070] For example, when the folding wheelchair needs to be folded, the backrest bracket 20 and the rear support bracket 30 rotate toward each other, that is, the ends of the backrest bracket 20 and the rear support bracket 30 away from the rotation center of the two gradually approach each other. As the folding wheelchair gradually approaches the fully folded state, the first limit shaft 32 first abuts against the body 911; under the thrust of the rear support bracket 30, the lock hook 91 can overcome the elastic force of the torsion spring and rotate in the clockwise direction.

[0071] When the folding wheelchair is completely folded, the first limit axis 32 can be inserted into the first limit hook groove 912, and the lock hook 91 and the first limit axis 32 are in a locked state under the action of the torsion spring. At this time, the lock hook 91 rotates counterclockwise and resets under the action of the torsion spring, 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 escaping from the first limit axis 32, thereby realizing the constraint of the backrest bracket 20 and the rear support frame 30, preventing the backrest bracket 20 and the rear support frame 30 from separating from each other around the rotation axis point b, that is, further improving the locking reliability of the backrest bracket 20 and the rear support frame 30 when the folding wheelchair is in the folded state.

[0072] On the basis of the above-mentioned embodiment, the locking hook mechanism 90 provided in 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 lock the backrest bracket 20 and the rear support frame 30 in the unfolded state.

[0073] like Figures 7 to 10 As shown, the locking hook mechanism 90 provided in the embodiment of the present application further includes a second limiting shaft 33, which is fixed to one end of the rear support frame 30 close to the backrest support 20, and the second limiting shaft 33 is spaced apart from the first limiting shaft 32. Accordingly, the body 911 is further provided with a second limiting hook groove 913 that cooperates with the second limiting shaft 33, and when the folding wheelchair is in the unfolded state, the second limiting hook groove 913 can be engaged with the second limiting shaft 33, thereby realizing the locking of the backrest support 20 and the rear support frame 30 when the folding wheelchair is in the unfolded state.

[0074] For example, when the folding wheelchair needs to be unfolded, the backrest bracket 20 and the rear support bracket 30 rotate in opposite directions, that is, the backrest bracket 20 and the rear support bracket 30 are gradually separated from each other at one end away from the rotation center of the two. As the folding wheelchair gradually approaches the fully unfolded state, the second limit shaft 33 first abuts against the body 911; under the thrust of the rear support bracket 30, the lock hook 91 can overcome the elastic force of the torsion spring and rotate in the clockwise direction.

[0075] When the folding wheelchair is fully unfolded, the second limit axis 33 can be inserted into the second limit hook groove 913, and the lock hook 91 and the second limit axis 33 are in a locked state under the action of the torsion spring. At this time, the lock hook 91 rotates counterclockwise and resets under the action of the torsion spring, 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 escaping from the first limit axis 32. In this way, the backrest bracket 20 and the rear support frame 30 can be constrained to prevent the backrest bracket 20 and the rear support frame 30 from separating from each other around the rotation axis point b; that is, the locking reliability of the backrest bracket 20 and the rear support frame 30 when the folding wheelchair is in the unfolded state is improved.

[0076] It should be noted that the second limiting hook groove 913 and the first limiting hook groove 912 are arranged relative to the shaft mounting hole 918 of the body 911 , and the first limiting hook groove 912 and the second limiting hook groove 913 are respectively located on both sides of the body 911 .

[0077] For example, the first limiting hook groove 912 is located on the first side of the main body 911, and the second limiting hook groove 913 is located on the second side of the main body 911. When the folding wheelchair is in a folded state, the first side of the main body 911 is close to the first limiting shaft 32, and the first limiting hook groove 912 located on the first side can be engaged with the first limiting shaft 32.

[0078] On the contrary, when the folding wheelchair is in the unfolded state, due to the change in 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 groove 913 located on the second side can be engaged with the second limiting shaft 33.

[0079] Further, a first hook 915 is provided on a first side of the body 911, the first hook 915 extends obliquely relative to the body 911, and a first position-limiting hook groove 912 is formed between the first hook 915 and the body 911. Correspondingly, a second hook 916 is provided on a second side of the body 911, the second hook 916 extends obliquely relative to the body 911, and a second position-limiting hook groove 913 is formed between the second hook 916 and the body 911.

[0080] 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 an unfolded or folded state, a locking hook 91 can be respectively engaged with the first limiting shaft 32 and the second limiting shaft 33.

[0081] On the basis of the above implementation, a first guide surface is further provided on the first side of the body 911, 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 limiting groove, and when the folding wheelchair is folded, the backrest bracket 20 and the rear support frame 30 rotate toward each other, and when the folding wheelchair tends to be in a fully folded state, the first guide surface can contact the first limiting shaft 32, and under the thrust of the rear support frame 30, the first limiting shaft 32 moves along the first guide surface toward the first limiting hook groove 912 until the first limiting shaft 32 is engaged in the first limiting hook groove 912.

[0082] Similarly, a second guide surface is also provided on the second side of the body 911, and the second guide surface and the second hook body 916 are located on the same side of the body 911. The second guide surface can extend into the second limit hook groove 913, and when the folding wheelchair is unfolded, the backrest bracket 20 and the rear support frame 30 rotate in opposite directions, and when the folding wheelchair tends to be in a fully unfolded state, the second guide surface can contact the second limit shaft 33, and under the thrust of the rear support frame 30, the second limit shaft 33 moves along the second guide surface toward the second limit hook groove 913 until the second limit shaft 33 is engaged in the second limit hook groove 913.

[0083] On the basis of the above-mentioned embodiment, the locking hook 91 provided in the embodiment of the present application further includes a wrench 917, which is fixed on the body 911. The wrench 917 is arranged on the side of the abutting portion 914 of the body 911 away from the limiting surface. When the locking hook 91 locks the backrest bracket 20 and the rear support frame 30, there is an operating space between the wrench 917 and the backrest bracket 20, so as to operate the wrench 917, thereby rotating the locking hook 91, and then disengaging the first limiting groove of the locking hook 91 from the first limiting shaft 32, or disengaging the second limiting hook groove 913 from the second limiting shaft 33.

[0084] For example, when the folding wheelchair is in the unfolded state, the abutment portion 914 of the lock hook 91 abuts against the limiting protrusion of the backrest bracket 20, and the second limiting hook groove 913 of the lock hook 91 is engaged with the second limiting shaft 33. Since the lock hook 91 abuts against the backrest bracket 20 through the abutment portion 914 and the limiting protrusion, the lock hook 91 cannot rotate in the counterclockwise direction.

[0085] When the folding wheelchair is to be folded, it is necessary to contact the limiting state between the locking hook 91 and the backrest bracket 20. A rotational force can be applied to the wrench 917 to rotate the locking hook 91 clockwise, so that the second limiting hook groove 913 of the locking hook 91 is disengaged from the second limiting shaft 33 to release the locking state between the backrest bracket 20 and the rear support frame 30.

[0086] On the basis of the above embodiments, the locking hook mechanism 90 provided in the embodiment of the present application includes two locking hooks 91 and a linkage rod 92, wherein the linkage rod 92 is arranged between the two locking hooks 91, and the two ends of the linkage rod 92 are respectively connected to the two locking hooks 91, and the linkage rod 92 can drive the two locking hooks 91 to move synchronously.

[0087] For example, two lock hooks 91 are respectively arranged on the left and right sides of the folding wheelchair, and the two lock hooks 91 are connected together by a linkage rod 92. When the folding wheelchair needs to be folded or unfolded, the lock hook mechanism 90 can be unlocked by operating the wrench 917 of the lock hook 91 located on one side of the folding wheelchair, so as to improve the user experience.

[0088] Furthermore, 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, it is inconvenient to operate because the wrench 917 is in the folding space of the folding wheelchair. Therefore, a downward force can be applied to the linkage rod 92, and this downward force is converted into a rotational force of the lock hook 91, so that the lock hook 91 rotates relative to the backrest bracket 20, and the first limit hook groove 912 of the lock hook 91 is disengaged from the first limit shaft 32 to release the locking 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 the user experience.

[0089] The various embodiments or implementation methods in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other.

[0090] It should be noted that the phrases "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments", etc. mentioned in the specification indicate that the described embodiments may include certain features, structures or characteristics, but not every embodiment may include the certain features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing certain features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments, whether explicitly or not explicitly described.

[0091] In general, terms should be understood, at least in part, by the context in which they are used. For example, the term "one or more" as used herein may be used to describe any feature, structure, or characteristic in a singular sense, or may be used to describe a combination of features, structures, or characteristics in a plural sense, depending, at least in part, on the context. Similarly, terms such as "a," "an," or "the" may also be understood to convey singular usage or to convey plural usage, depending, at least in part, on the context.

[0092] It should be easily understood that “on,” “above,” and “over” in the present disclosure should be interpreted in the broadest manner, so that “on” not only means “directly on something,” but also includes the meaning of “on something” with intervening features or layers therebetween, and “above” or “over” not only includes the meaning of “above” or “over,” but also may include the meaning of “above” or “over something” with no intervening features or layers therebetween (i.e., directly on something).

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A folding wheelchair, characterized in that: It includes a locking hook mechanism and a rotatably connected backrest bracket and a rear support frame; The locking hook mechanism comprises a locking hook and a first limiting shaft; the locking hook comprises a body, the body is rotatably connected to the backrest bracket, the body is provided with a first limiting hook groove matched with the first limiting shaft, and the first limiting shaft is fixed to the rear support frame; The locking hook is configured such that when the rear support frame and the backrest support rotate toward each other and the folding wheelchair is in a folded state, the first limiting hook groove is engaged with the first limiting shaft; The locking hook mechanism further includes 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 matched with the second limiting shaft; The locking hook is configured such that when the rear support frame and the backrest support rotate in opposite directions and the folding wheelchair is in an unfolded state, the second limiting hook groove is engaged with the second limiting shaft; The main body is provided with an abutment portion, and the backrest bracket is provided with a limiting surface matched with the abutment portion; The abutment portion is configured such that when the folding wheelchair is in a folded state or an unfolded state, the abutment portion is in contact with the limiting surface and limits the rotation angle of the locking hook relative to the backrest bracket; The backrest bracket is provided with a limited position protrusion; The limiting protrusion is arranged opposite to the abutting portion, and the limiting protrusion has the limiting surface on a side facing the abutting portion.

2. The folding wheelchair according to claim 1, characterized in that: The locking 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 a locking force to the locking hook.

3. The folding wheelchair according to claim 2, characterized in that: The locking hook also includes a wrench; The wrench is arranged on a side of the abutting portion away from the limiting surface, and a rotation space is provided between the wrench and the backrest bracket.

4. The folding wheelchair according to claim 2, characterized in that: The body is provided with a rotating shaft mounting hole; The backrest bracket is provided with a rotating shaft, and the body is sleeved on the rotating shaft through the rotating shaft mounting hole; The first limiting hook groove and the second limiting hook groove are arranged relative to the rotating shaft installation hole and are respectively located on both sides of the rotating shaft installation hole.

5. The folding wheelchair according to claim 4, characterized in that: 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 causes the locking hook to rotate relative to the backrest bracket.

6. The folding wheelchair according to claim 3, characterized in that: The two sides of the body are respectively provided with a first hook body and a second hook body; The first limiting hook groove is formed between the first hook body and the body, and 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 main body, and the extending directions of the two are opposite.

7. The folding wheelchair according to claim 6, characterized in that: A first guide surface is provided at a position of the main body close to the first hook body, and the locking hook is configured so that when the backrest bracket and the rear support bracket rotate toward each other, the first limiting shaft contacts the first guide surface and slides along the first guide surface into the first limiting hook groove; A second guide surface is provided at a position of the main body close to the second hook body, and the locking hook is configured so that when the backrest bracket and the rear support frame rotate in opposite directions, the second limiting shaft contacts the second guide surface and slides along the second guide surface into the second limiting hook groove.

8. The folding wheelchair according to any one of claims 1 to 7, characterized in that: The locking hook mechanism comprises two locking hooks which are symmetrically arranged and a linkage rod connecting the two locking hooks.

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