Folding wheelchair

Abstract

The utility model provides a kind of folding wheelchair.The wheelchair includes front wheel, rear wheel, skeleton and handrail;The skeleton includes front wheel frame, rear wheel frame, backrest frame, seat frame and pivot assembly;The front wheel is rotatably connected on the front wheel frame, and the rear wheel is rotatably connected on the rear wheel frame;The backrest frame, seat frame, front wheel frame and rear wheel frame are linked through the pivot assembly, to change the skeleton between unfolded state and folding state;The rear part of the handrail is rotatably connected with the backrest frame through the fifth pivot;In the process of changing from the unfolded state to the folding state, the front wheel frame contacts with the handrail, to push the handrail to rotate around the fifth pivot relative to the backrest frame.In the case that there is no too much connecting rod structure between handrail and skeleton, the synchronous linkage folding of handrail along with skeleton is realized, the overall structure cost is low, the wheelchair is lightweight, and the folding operation is simple.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a folding wheelchair. Background Technology

[0002] A wheelchair is a device designed to assist people with mobility impairments in moving around. It provides body support and balance, enabling users to move independently indoors or outdoors. With increasing user demand, foldable wheelchairs have emerged on the market for easier storage.

[0003] However, current folding wheelchairs on the market still suffer from problems such as complex operation and cumbersome steps. For example, the armrests either require too many linkages to fold or need to be folded separately. Especially for users with limited mobility, the folding process often consumes a lot of physical strength and time, reducing the product's practicality and user experience, and limiting its widespread application in daily life. Utility Model Content

[0004] In order to solve the problems of inconvenient folding and cumbersome operation, the purpose of this utility model is to provide a folding wheelchair.

[0005] To achieve the above objectives, one embodiment provides a folding wheelchair. The wheelchair includes front wheels, rear wheels, a frame, and armrests; the frame includes a front wheel frame, a rear wheel frame, a backrest frame, a seat frame, and a pivot assembly. The front wheel is rotatably connected to the front wheel frame, and the rear wheel is rotatably connected to the rear wheel frame; The backrest frame, seat frame, front wheel frame, and rear wheel frame are linked together by the pivot assembly to allow the frame to change between an unfolded state and a folded state. The rear part of the armrest is rotatably connected to the backrest frame via a fifth pivot. During the transition from the unfolded state to the folded state, the front wheel frame contacts the armrest to push the armrest to rotate relative to the backrest frame around the fifth pivot.

[0006] In a preferred embodiment, the skeleton has an intermediate state between the unfolded state and the folded state; During the transition from the unfolded state to the intermediate state, the backrest frame, seat frame, front wheel frame, and rear wheel frame are linked together through the pivot assembly, and the armrest does not contact the front wheel frame and does not rotate relative to the backrest frame. During the transition from the intermediate state to the folded state, the backrest frame, seat frame, front wheel frame, and rear wheel frame continue to move in tandem through the pivot assembly, and the armrest rotates relative to the backrest frame around the fifth pivot under the push of the front wheel frame.

[0007] In a preferred embodiment, when changing from the unfolded state to the folded state, the backrest frame rotates relative to the seat frame by a first angle; When transitioning from the unfolded state to the intermediate state, the backrest frame rotates relative to the seat frame by a second angle; The second angle is 50-70% of the first angle; or, the first angle is 90°-110° and the second angle is 45°-65°.

[0008] In a preferred embodiment, the front part of the front wheel frame has a pushing part, and the front part of the armrest has a force-receiving part; When the frame changes to a folded state, the pushing part contacts the force-receiving part to push the armrest to rotate upward relative to the backrest frame around the fifth pivot.

[0009] In a preferred embodiment, the backrest frame includes: The frame is rotatably connected to the seat frame and the front wheel frame via the pivot assembly; and, The connecting seat is movably connected to the frame and can be self-locked to be fixed at different height positions on the frame; The handrail and the connecting seat are rotatably connected via a fifth rotating shaft.

[0010] In a preferred embodiment, one of the handrail and the connecting seat is provided with a guide groove, and the other is provided with a guide post; The guide groove is an arc-shaped groove surrounding the fifth rotating axis; The guide post is inserted into the guide groove and moves between the two ends of the arc of the guide groove; In the unfolded state, the guide post is located at one end of the arc of the guide groove; in the folded state, the guide post is located at the other end of the arc of the guide groove.

[0011] In a preferred embodiment, the rotating shaft assembly includes a first rotating shaft, a second rotating shaft, a third rotating shaft, and a fourth rotating shaft; The front wheel frame and the rear wheel frame are rotatably connected in a cross shape via a first pivot. The rear part of the front wheel frame is rotatably connected to the frame via a second pivot. The front part of the rear wheel frame is rotatably connected to the seat frame via a third pivot. The rear part of the seat frame is rotatably connected to the frame via a fourth pivot. In the unfolded state, within the vertical projection plane of the pivot assembly: the second pivot is located in front of the line connecting the first pivot and the fourth pivot; and the line connecting the second pivot and the fourth pivot and the line connecting the second pivot and the first pivot have an angle, and the angle is an obtuse angle and does not exceed 160°.

[0012] In a preferred embodiment, the wheelchair further includes: Assisted rollers; The bracket has a first end and a second end that are arranged opposite to each other; the first end is rotatably connected to the assist roller, and the second end is rotatably connected to the lower front part of the frame about the assist shaft, so that the bracket has a first locking position, a second locking position and a third locking position relative to the frame; When in the first locking position, the bracket drives the assist roller to be housed between the front wheel and the rear wheel, and is located above the bottom plane defined by the front wheel and the rear wheel; When in the second and third positions, the bracket drives the assist roller to extend below the bottom plane, and the third position is located on the side of the second position away from the first position along the rotation path.

[0013] In a preferred embodiment, the wheelchair further includes: The bracket has a first end and a second end that are disposed opposite to each other; the second end is rotatably connected to the lower front part of the frame about a power-assisting shaft, so that the bracket has a first locking position and a second locking position relative to the frame; The assisting roller includes a sub-bracket and three wheels. The sub-bracket is rotatably connected to the first end of the bracket around a central axis. The three wheels are all rotatably connected to the sub-bracket and are evenly arranged circumferentially around the central axis. When in the first locking position, the bracket drives the assist roller to be housed between the front wheel and the rear wheel, and is located above the bottom plane defined by the front wheel and the rear wheel; When in the second locking position, the bracket drives the assist roller to extend below the bottom plane.

[0014] In a preferred embodiment, the wheelchair further includes an anti-tilt assembly, which is rotatably connected to the frame about an anti-tilt pivot and has an anti-tilt position and a support position that are fixed relative to the frame; when in the anti-tilt position, the anti-tilt assembly extends below the rear wheel; when in the support position, the anti-tilt assembly extends above the rear wheel. Positioning pins and positioning holes, one of which is located on the anti-tilt assembly, and the other is located on the frame; and, An elastic element is disposed between the anti-tilt assembly and the frame; When in the anti-tilt position, the positioning pin and positioning hole engage to limit the relative rotation of the anti-tilt assembly and the frame, and the elastic element applies an elastic force to the anti-tilt assembly toward the support position.

[0015] Compared with the prior art, the beneficial effects of this embodiment of the utility model are as follows: Firstly, the armrest and backrest frame are rotatably connected via a fifth pivot, eliminating the need for linkage mechanisms between the armrest and other parts of the frame, thus simplifying the connection structure. Secondly, the armrest is pushed by the front wheel frame, achieving synchronous linkage with the frame, allowing the armrest to fold automatically without the need for separate folding operations. The overall operation is simple, completing the simultaneous folding of the frame and armrest in one operation. In summary, this avoids the need for excessive linkage structures due to armrest folding, resulting in lower overall structural costs, lighter wheelchairs, and simple operation due to the synchronous linkage folding of the armrest with the frame. Attached Figure Description

[0016] Figure 1 This is a perspective view of a wheelchair in its unfolded state according to an embodiment, wherein the example anti-tilt component is in the anti-tilt position; Figure 2 yes Figure 1 Side view of the wheelchair; Figure 3 This is a perspective view of a wheelchair in a folded state according to an embodiment, wherein the example power assist mechanism is in the first locking position and the anti-tipping component is in the support position; Figure 4 yes Figure 3 Side view of the wheelchair; Figure 5 This is a side view of a wheelchair in an intermediate position according to an embodiment; Figure 6 This is an exploded view of the backrest frame and armrests in one embodiment; Figure 7 This is a perspective view of the locking mechanism of a wheelchair in its unfolded state according to an embodiment; Figure 8 yes Figure 7 A cross-sectional view along line BB, where solid lines indicate the unlocking element is in the locked position and dashed lines indicate the unlocking element is in the unlocked position; Figure 9 This is a perspective view of a wheelchair in a folded state according to an embodiment; Figure 10 yes Figure 9 A magnified view of a portion of region C in the middle; Figure 11 This is a side view of a wheelchair in a folded state according to an embodiment, wherein the example power assist mechanism is in the second locking position; Figure 12 This is a side view of a wheelchair in a folded state according to an embodiment, wherein the example power assist mechanism is in the third locking position; Figure 13 yes Figure 1 A magnified view of a portion of region D in the middle; Figure 14 yes Figure 3Partial enlarged view of area E; Figure 15 is Figure 14 Partial enlarged structural decomposition view of area E; Figure 16 It is a state diagram when the wheelchair in the folded state is erected on the horizontal ground F. Specific embodiments

[0017] The following will describe the present application in detail in conjunction with the specific embodiments shown in the drawings. However, these embodiments are only used to illustrate the present utility model and do not limit the scope of the present application. Any structural, method, or functional transformation made by those of ordinary skill in the art based on these embodiments is included within the protection scope of the present application.

[0018] In each of the drawings of the present application, for the convenience of illustration, certain dimensions of the structure or part are exaggerated relative to other structures or parts. Therefore, it is only used to illustrate the basic structure of the subject matter of the present application.

[0019] Refer Figures 1 to 4 , an embodiment of the present utility model provides a wheelchair 100, which may specifically be a foldable wheelchair 100, an electric foldable wheelchair 100. Of course, the present application is not limited thereto.

[0020] The wheelchair 100 includes a frame 10, front wheels 20, rear wheels 30, and armrests 15.

[0021] The number of the front wheels 20 is set to be a pair, and they are respectively rotatably connected to the lower front part of the frame 10.

[0022] The number of the rear wheels 30 is set to be a pair, and they are respectively rotatably connected to the lower rear part of the frame 10.

[0023] In the case where the wheelchair 100 is set as an electric wheelchair, the rear wheels 30 can be set as drive wheels.

[0024] In one embodiment, the front wheels 20 and the rear wheels 30 can jointly define a bottom plane T of the wheelchair 100, and this bottom plane T is a virtual plane.

[0025] If the wheelchair 100 is placed on a support platform and the front wheels 20 and the rear wheels 30 jointly contact the support platform, the bottom plane T is also overlapped with the support platform.

[0026] In the present application, it can be understood that with reference to the bottom plane T defined by the front wheels 20 and the rear wheels 30, the front-back direction and the left-right direction are parallel to this bottom plane T; the height direction / up-down direction is the direction perpendicular to this bottom plane T. It should be noted that in the present application, only the bottom plane T is used to define the concepts such as the front-back, left-right, height, and up-down of the wheelchair 100, and this bottom plane T is not the same as the horizontal ground.

[0027] Reference Figures 1 to 4 , the frame 10 has an unfolded state and a folded state. It can be understood that, as Figure 1 and Figure 2 shown, in the unfolded state, the frame 10 can be used for a user to sit on; as Figure 3 and Figure 4 shown, in the folded state, the user cannot directly sit on the frame 10.

[0028] In one embodiment, the frame 10 includes a backrest frame 11, a seat frame 12, a front wheel frame 13, a rear wheel frame 14 and a rotating shaft assembly.

[0029] Among them, the seat frame 12 can be used to install a cushion for the user to sit on.

[0030] The backrest frame 11 can be used to install a backrest for the user's back to lean on.

[0031] The front part of the front wheel frame 13 is rotatably connected to the front wheel 20, for example, it can be rotatably connected around the front rotating shaft.

[0032] The rear part of the rear wheel frame 14 is rotatably connected to the rear wheel 30, for example, it can be rotatably connected around the rear rotating shaft.

[0033] When the wheelchair 100 is set as an electric wheelchair, the rear wheel frame 14 can also integrate a power source and a drive motor. Of course, the present application is not limited to this.

[0034] The backrest frame 11, the seat frame 12, the front wheel frame 13 and the rear wheel frame 14 are linked by the rotating shaft assembly to enable the frame 10 to transform between the unfolded state and the folded state.

[0035] In the present application, the armrest 15 can also be linked with the frame 10 during the folding process of the frame 10.

[0036] Specifically, reference Figure 5 and Figure 6 , the rear part of the armrest 15 is rotatably connected to the backrest frame 11 through the fifth rotating shaft 195.

[0037] During the transformation process from the unfolded state to the folded state, as Figure 5 shown, the front wheel frame 13 contacts the armrest 15 to push the armrest 15 to rotate relative to the backrest frame 11 around the fifth rotating shaft 195.

[0038] In this way, during the process of the frame 10 changing from the unfolded state to the folded state, there is no need to manually fold the armrest 15. The armrest 15 can directly联动 and fold under the pushing action of the front wheel frame 13, thereby making the folding operation of the entire wheelchair 100 more convenient and simple.

[0039] That is, in the wheelchair 100 of this application, on the one hand, the armrest 15 and the backrest frame 11 are rotatably connected through the fifth pivot 195, and the connection structure is simple. On the other hand, through the pushing action of the front wheel frame 13 on the armrest 15, the armrest 15 is synchronously linked with the frame 10 when the wheelchair 100 is folded, and the armrest 15 is automatically folded. There is no need to fold the armrest 15 separately. The overall operation is simple and the frame 10 and the armrest 15 are folded at the same time in one go.

[0040] In summary, this design avoids the need for excessive linkage structures due to the folding of the armrest 15, resulting in lower overall structural costs, a lighter wheelchair, and simple operation as the armrest 15 folds synchronously with the frame 10.

[0041] Furthermore, the front part of the front wheel frame 13 has a pusher 131.

[0042] Specifically, the propulsion part 131 can be constructed as a high-strength flat surface or protrusion at the front of the front wheel frame 13.

[0043] The front part of the handrail 15 has a load-bearing part.

[0044] The force-bearing part can be specifically constructed as a flat surface, a pointed tip, or a protrusion on the lower front side of the handrail 15.

[0045] The pushing part 131 and the force-receiving part are positioned opposite each other. When the frame 10 changes from the unfolded state to the folded state, the pushing part 131 contacts the force-receiving part to push the armrest 14 to rotate upward relative to the backrest frame 11 around the fifth pivot 195.

[0046] In one embodiment, the skeleton 10 further has an intermediate state between the unfolded state and the folded state, such as... Figure 5 As shown.

[0047] During the transition from the unfolded state to the intermediate state, that is, from... Figure 2 State change to Figure 5 Before the initial folding, the backrest frame 11, seat frame 12, front wheel frame 13 and rear wheel frame 14 are linked by the pivot assembly to perform initial folding. The armrest 15 does not contact the front wheel frame 13, that is, the pushing part 131 has not yet contacted the force-bearing part, and the armrest 15 and the backrest frame 11 do not rotate relative to each other.

[0048] During the transition from the intermediate state to the folded state, that is, from... Figure 5 State change to Figure 4 During the folding process, the backrest frame 11, seat frame 12, front wheel frame 13, and rear wheel frame 14 continue to work together via the pivot assembly to complete the folding. The armrest 15 rotates relative to the backrest frame 11 around the fifth pivot under the push of the front wheel frame 13 (specifically, the pusher 131 pushes the armrest 15).

[0049] More specifically, when changing from the unfolded state to the folded state, the backrest frame 11 rotates relative to the seat frame 12 by a first angle; that is, the angle by which the backrest frame 11 and the seat frame 12 rotate relative to each other (e.g., around the fourth pivot 194 described later) is the first angle.

[0050] When transitioning from the unfolded state to the intermediate state, the backrest frame 11 rotates relative to the seat frame 12 by a second angle; that is, the angle by which the backrest frame 11 and the seat frame 12 rotate relative to each other (e.g., around the fourth pivot 194 described later) is the second angle.

[0051] The second angle is 50-70% of the first angle.

[0052] Alternatively, from another perspective: the first angle is 90°~110°, and the second angle is 45°~65°.

[0053] Therefore, in the early stage of folding the wheelchair 100, the armrests 15 do not fold relative to the backrest frame 11, but simply flip downwards along with the backrest frame 11. In the later stage after the intermediate state, the armrests 15 fold relative to the backrest frame 11 under the push of the front wheel frame 13, until they are folded to the side of the backrest frame 11.

[0054] In one embodiment, the backrest frame 11 further includes a frame 110 and a connecting seat 111.

[0055] The lower part of the frame 110 is rotatably connected to the seat frame 12 via the pivot assembly, and is also rotatably connected to the front wheel frame 13 via the pivot assembly.

[0056] The rear end of the handrail 15 is rotatably connected to the connecting seat 111 via the fifth pivot 195.

[0057] The connecting seat 111 is movably connected to the frame 110 to drive the armrest 15 to move up and down; and the connecting seat 111 can be self-locked and fixed at different height positions of the frame 110, so that the user can adjust the appropriate height of the armrest 15.

[0058] Regarding the rotating structure between the connecting seat 111 and the armrest 15.

[0059] Specifically, one of the handrail 15 and the connecting seat 111 is provided with a guide groove 151, and the other is provided with a guide post 1112.

[0060] The guide groove 151 is configured as an arc-shaped groove around the fifth rotating axis 195.

[0061] The guide post 1112 is inserted into the guide groove 151 and slides between the two ends of the arc of the guide groove 151.

[0062] When unfolded, the guide post 1112 is located at one end of the arc of the guide groove 151, so that the armrest 15 is approximately 90° to 110°, for example 100°, with the backrest frame 11. Alternatively, the armrest 15 can be approximately parallel to the seat frame 12 to provide support for the user's arms.

[0063] In the folded state, the guide post 1112 moves to the other end of the arc of the guide groove 151, so that the armrest 15 rotates to approximately rest against the side of the frame 110 of the backrest frame 11, in a folded state.

[0064] The central angles at both ends of the arc of the guide groove 151 are approximately 90°, for example, between 80° and 110°.

[0065] Preferably, the number of guide posts 1112 and guide grooves 151 is set to two, and they correspond one-to-one.

[0066] More preferably, the two guide posts 1112 are symmetrically distributed around the fifth axis of rotation 195. Similarly, the two guide grooves 151 are also symmetrically distributed around the fifth axis of rotation 195.

[0067] Furthermore, the vertical moving connection and self-locking fixing method between the connecting seat 111 and the frame 110 can be implemented in any feasible manner in the art.

[0068] For example, connector 111 has a through hole 1110 and a self-locking wrench 1111.

[0069] The connecting seat 111 is sleeved onto the frame 110 through the through hole 1110; the self-locking wrench 1111 is configured as an eccentric wheel structure. Rotating the self-locking wrench 1111 loosens the connecting seat 111 and the frame 110, thereby allowing the connecting seat 111 to move up and down relative to the frame 110; after the connecting seat 111 is adjusted to the required height, rotating the self-locking wrench 111 locks the connecting seat 111 onto the frame 110, thereby achieving self-locking fixation of the connecting seat 111.

[0070] The number of handrails 15 is set to two, namely, the left handrail 15 and the right handrail 15.

[0071] When the wheelchair 100 is configured as an electric wheelchair, one of the two armrests 15 is provided with a controller 150. For example, the controller 150 is provided at the front end of the right armrest 15 so that the user can control the movement of the wheelchair 100.

[0072] Next, continue to participate Figure 2 In one embodiment, the rotating shaft assembly includes a first rotating shaft 191, a second rotating shaft 192, a third rotating shaft 193, and a fourth rotating shaft 194.

[0073] The front wheel frame 13 and the rear wheel frame 14 are connected in a cross-shaped rotatable manner via the first rotating shaft 191.

[0074] The rear of the front wheel frame 13 is rotatably connected to the backrest frame 11 (specifically the frame 110) via the second pivot 192.

[0075] The front part of the rear wheel frame 14 is rotatably connected to the seat frame 12 via a third pivot 193.

[0076] The rear of the seat frame 12 is rotatably connected to the backrest frame 11 (specifically the frame 110) via a fourth pivot 194.

[0077] Thus, when the wheelchair 100 needs to be stored, the frame 10 can be changed from an unfolded state to a folded state.

[0078] Specifically, by pushing the backrest frame 11 from back to front, the backrest frame 11 and the seat frame 12 rotate relative to each other via the fourth pivot 194 to gradually fold up. At the same time, the backrest frame 11 and the front wheel frame 13 rotate relative to each other via the second pivot 192, the seat frame 12 and the rear wheel frame 14 rotate relative to each other via the third pivot 193, and the front wheel frame 13 and the rear wheel frame 14 rotate relative to each other via the first pivot 191, so that the backrest frame 11 and the front wheel frame 13, the seat frame 12 and the rear wheel frame 14, and the front wheel frame 13 and the rear wheel frame 14 all gradually fold up.

[0079] In one embodiment, the reference Figure 2 In the unfolded state, the vertical projection plane of the rotating shaft assembly (e.g.) Figure 2 Inside: The second rotating shaft 192 is located in front of the line connecting the first rotating shaft 191 and the fourth rotating shaft 194; and the line connecting the second rotating shaft 192 and the fourth rotating shaft 194 and the line connecting the second rotating shaft 192 and the first rotating shaft 191 has an angle A, and the angle A is an obtuse angle and the angle does not exceed 160°.

[0080] That is, the included angle A is greater than 90° and less than or equal to 160°.

[0081] In this way, by designing the positional relationship between the second pivot 192, the fourth pivot 194, and the first pivot 191 for the four-link frame 10, not only is it very convenient and easy to operate when unfolding and folding the wheelchair 100, but it also makes the frame 10 more stable in the unfolded state. When the user gets on or off the wheelchair, even if they only sit on part of the seat frame 12 (i.e., not on the back of the seat frame 12), the seat frame 12 and the backrest frame 11 will not be triggered to tip forward. The wheelchair 100 can be stably kept in the unfolded state and is not easy to accidentally start folding. In addition, it also reduces the structural strength requirements of the locking mechanism 16 and avoids the locking mechanism from jamming or being damaged.

[0082] Preferably, the included angle A is 140°~160°.

[0083] More preferably, the included angle A is 150°~160°, for example 150°, 152°, 153°, 154°, 155°, 156°, 157°, 158°, 159°, 160°.

[0084] Among them, the first rotating shaft 191, the second rotating shaft 192, the third rotating shaft 193 and the fourth rotating shaft 194 are parallel and all extend in the left and right direction.

[0085] In one embodiment, when in the unfolded state, among the first rotating shaft 191, the second rotating shaft 192, the third rotating shaft 193, and the fourth rotating shaft 194: the first rotating shaft 191 has the lowest height, and the fourth rotating shaft 194 has the highest height.

[0086] In one embodiment, in the unfolded state, among the first rotating shaft 191, the second rotating shaft 192, the third rotating shaft 193, and the fourth rotating shaft 194: the third rotating shaft 193 is the foremost and the fourth rotating shaft 194 is the rearmost.

[0087] Furthermore, in the unfolded state, within the vertical projection plane of the pivot assembly: the front-to-back distance (i.e., the distance along the front-to-back direction) between the third pivot 193 and the front end point 120 of the seat frame 12 is less than or equal to 1 / 3 or 1 / 4 of the front-to-back distance between the fourth pivot 194 and the front end point 120 of the seat frame 12.

[0088] In this way, even if the user only sits on the front half of the seat frame 12, or even the front 1 / 4 or 1 / 3 of the seat frame, the wheelchair 100 can remain stably in the unfolded state without accidentally flipping over and folding due to the user's weight. This improves the safety of use, reduces the strength requirements of the locking mechanism, and prevents the locking mechanism from jamming or being damaged.

[0089] Furthermore, participants Figure 7 and Figure 8 The frame 10 also includes a locking mechanism 16.

[0090] The locking mechanism 16 is used to lock the frame 10 in the deployed state.

[0091] Specifically, in the unfolded state, the backrest frame 11 (specifically the frame 110) and the front wheel frame 13 are connected by a locking mechanism 16 to restrict relative rotation between them.

[0092] For example, in the unfolded state, the locking mechanism 16 connects the lower part of the backrest frame 11 and the rear part of the front wheel frame 13 to prevent the lower part of the backrest frame 11 and the rear part of the front wheel frame 13 from moving away from each other, thereby restricting the backrest frame 11 and the front wheel frame 13 from rotating relative to each other around the second pivot 192. In this way, the frame 10 can be locked in the unfolded state.

[0093] In one embodiment, the locking mechanism 16 includes a locking lever 161, a locking groove 162, and an unlocking element 163.

[0094] The locking lever 161 is fixedly installed at the lower part of the backrest frame 11.

[0095] The locking slot 162 is located at the rear of the front wheel frame 13.

[0096] When in the unfolded state, the locking lever 161 is embedded in the locking groove 162.

[0097] During the transition from the unfolded state to the folded state, the backrest frame 11 and the front wheel frame 13 rotate relative to each other via the second pivot 192, thereby causing the locking lever 161 to disengage from the locking groove 162.

[0098] For example, the locking lever 161 moves upward, thereby disengaging from the locking slot 162.

[0099] The unlocking element 163 is rotatably connected to the rear of the front wheel carrier 13, for example, the unlocking element 163 rotates about the pivot 160.

[0100] The unlocking component 163 has a locked position and an unlocked position.

[0101] The unlock position is set relative to the locked position along the first rotation direction.

[0102] That is, the unlocking member 163 has a locked position and an unlocked position on the rotation path of the unlocking member 163 relative to the front wheel frame 13; wherein, the unlocking member 163 can rotate from the locked position to the unlocked position when rotating relative to the front wheel frame 13 in the first rotation direction.

[0103] by Figure 8 From the perspective of angle, the first direction of rotation is counterclockwise.

[0104] In one embodiment, when in the locked position, the unlocking member 163 extends into the path of the locking lever 161 in and out of the locking groove 162, and when in the unfolded state, it prevents the locking lever 161 from leaving the locking groove 162.

[0105] For example, the locking lever 161 moves upward to disengage from the locking slot 162; correspondingly, in the locked position, the unlocking member 163 extends above the locking lever 161.

[0106] When unlocking the location, such as Figure 8 As shown by the dashed line, the unlocking element 163 exits the path (i.e., the path of the locking lever 161 entering and exiting the locking groove 162) and allows the locking lever 161 to leave the locking groove 162.

[0107] In this way, through the cooperation of the unlocking component 163, the locking groove 162 and the locking rod 161, the relative positions of the backrest frame 11 and the front wheel frame 13 are locked in the unfolded state, preventing the backrest frame 11 and the front wheel frame 13 from rotating relative to each other; at the same time, the unlocking component 163 can also release the locking rod 161, thereby allowing the frame 10 to change from the unfolded state to the folded state.

[0108] In one embodiment, the locking mechanism 16 further includes a stop 165.

[0109] The stop 165 is fixedly installed at the rear of the front wheel frame 13.

[0110] When the unlocking member 163 is in the locked position and the unfolded state is in the unlocked state, the stop member 165 abuts against the unlocking member 163 to prevent the unlocking member 163 from rotating in the opposite direction of the first rotation direction.

[0111] Furthermore, when the unlocking member 163 is in the locked position and an external force attempts to disengage the locking lever 161 from the locking groove 162, the locking lever 161 abuts against the unlocking member 163 in the opposite direction of the first rotation direction. Due to the resistance of the stop member 165, the unlocking member 163 cannot rotate in the opposite direction of the first rotation direction, thereby locking the locking member 161 in the locking groove 162.

[0112] by Figure 8 From an angle perspective, the opposite direction of the first rotation direction is the clockwise direction.

[0113] In this way, with the cooperation of the stop 165, the unlocking member 163 is stably kept in the locked position. Even if the locking rod 161 violently strikes the unlocking member 163 upwards, the locking rod 161 can be prevented from dislodging from the locking groove 162, thereby keeping the frame 10 stably in the unfolded state.

[0114] In one embodiment, as mentioned above, by designing the positional relationship between the second pivot 192, the fourth pivot 194, and the first pivot 191, even if the user sits at the front of the seat frame 12, the user's weight will not be excessively transmitted to the locking mechanism 16, thus reducing the strength requirements of the locking mechanism 16, extending its service life, and making it less prone to damage or jamming.

[0115] In one embodiment, the stop 165 is a cylindrical protrusion disposed on the front wheel frame 13. However, this application is not limited thereto.

[0116] In one embodiment, the unlocking member 163 includes a lever 1631 and an unlocking block 1632.

[0117] The lever 1631 and the unlocking block 1632 are fixedly connected, and the unlocking block 1632 is rotatably connected to the rear of the front wheel frame 13 around the pivot 160.

[0118] When in the locked position, the front of the unlocking block 1632 extends into the path of the locking lever 161 as it enters and exits the locking groove 162, specifically above the locking lever 161, and prevents the locking lever 161 from leaving the locking groove 162 when in the unfolded state. Simultaneously, when in the locked position, the unlocking block 1632 abuts against the stop member 165, thereby restricting its rotation from the locked position away from the unlocked position.

[0119] When the wheelchair 100 needs to be folded, the lever 1631 can be pulled upwards. The lever 1631 causes the unlocking block 1632 to rotate relative to the front wheel frame 13. The front part of the unlocking block 1632 flips downwards and disengages from the path of the locking lever 161 in and out of the locking groove 162, as shown. Figure 8 As shown by the dashed line, this allows the locking lever 161 to move in and out of the locking slot 162.

[0120] In one embodiment, the locking mechanism 16 further includes an elastic drive element 164.

[0121] The elastic drive member 164 is connected between the unlocking member 163 and the front wheel carrier 13, and is used to apply an elastic force toward the locked position to the unlocking member 163. This ensures that the unlocking member 163 always tends to maintain or return to the locked position.

[0122] Specifically, the elastic drive member 164 is configured as a torsion spring, which is located at the pivot 160 between the unlocking block 1632 and the front wheel frame 13, and applies an elastic force to the unlocking block 1632 so that the unlocking member 163 is positioned toward the locked position.

[0123] For example, when the lever 1631 is pulled upward, the elastic force of the elastic drive member 164 can be overcome. The lever 1631 drives the unlocking block 1632 to rotate relative to the front wheel frame 13 and move to the unlock position. When the unlock position is reached, the lever 1631 is released. The elastic drive member 164 drives the unlocking block 1632 to rotate in the opposite direction of the first rotation direction through the elastic force until the unlocking block 1632 abuts against the stop member 165 to achieve the locking position.

[0124] Furthermore, the skeleton 10 also includes a second locking mechanism.

[0125] The second locking mechanism is used to lock the skeleton 10 in a folded state.

[0126] Specifically, in the folded state, the front of the seat frame 12 and the front of the front wheel frame 13 are connected by a second locking mechanism to limit them from moving away from each other.

[0127] The second locking mechanism can be implemented in any manner feasible in the art. An example is provided herein, but this application is not limited thereto.

[0128] In one embodiment, the reference Figure 9The second locking mechanism includes a hook 171 and a resilient locking element 173.

[0129] The hook 171 is attached to the lower front part of the seat frame 12 and is slidably disposed relative to the seat frame 12. A slot 170 is formed between the hook 171 and the seat frame 12.

[0130] Thus, when the frame 10 is in the folded state, the hook 171 is located below the front crossbar 132 of the front wheel frame 13, which is engaged in the slot 170, thereby restricting the front of the front wheel frame 13 from moving downward relative to the front of the seat frame 12 and away from it, thereby locking the frame 10 in the folded state.

[0131] The hook 171 has an inclined lower side 1710. Thus, when the frame 10 changes from an unfolded state to a folded state, the crossbar 132 abuts against the inclined lower side 1710 from below, thereby pushing the hook 171 to slide relative to the seat frame 12 (e.g., to overcome the elastic force of the elastic locking member 173 to slide forward), without manual operation.

[0132] When it is necessary to unfold the frame 10 from the folded state, the hook 171 can be pulled by hand to disengage the crossbar 132 from the slot 170, thereby allowing the front part of the front wheel frame 13 to move downward and away from the front part of the seat frame 12.

[0133] The elastic locking element 173 is disposed between the hook 171 and the seat frame 12 and is used to apply an elastic force to the hook 171 so that the hook 171 can be reset backward.

[0134] In one embodiment, the elastic locking member 173 is configured as a spring or a compression spring, but this application is not limited thereto.

[0135] Furthermore, participants Figure 9 and Figure 10 Wheelchair 100 also includes 40 assistive devices (refer to the numbered list). Figure 1 ).

[0136] The assist mechanism 40 is used to provide assistance when moving the wheelchair 100 to a higher place (such as the trunk of a car).

[0137] Specifically, the assist mechanism 40 includes an assist roller 42 and a bracket 41.

[0138] The bracket 41 has a first end and a second end.

[0139] The first end of the bracket 41 (e.g.) Figure 10 The lower end of the middle is rotatably connected to a power-assisted roller 42.

[0140] The second end of the bracket 41 (e.g.) Figure 10The upper end of the bracket 41 is rotatably connected to the front of the front wheel frame 13 about the power steering shaft 400, and the bracket 41 has a first locking position and a second locking position fixedly connected to the frame 10.

[0141] When in the first card position, refer Figure 5 The bracket 41 drives the assist roller 42 to be housed between the front wheel 20 and the rear wheel 30, and is located above the bottom plane T.

[0142] In this way, when the frame 10 is in the unfolded state, the support 41 is in the first locking position, and the front wheel 20 and rear wheel 30 are on the ground, the power assist mechanism 40 does not contact the ground, thus not affecting the normal use of the wheelchair 100.

[0143] When in the second card slot, refer Figure 9 and Figure 11 The bracket 41 drives the assist roller 42 to unfold, so that the assist roller 42 extends below the bottom plane T. For example, it can be below (or below the front wheel 20).

[0144] In this way, when the frame 10 is in a folded state and the wheelchair 100 needs to be moved into the trunk of the car, the bracket 41 is in the second locking position, so that the power assist roller 42 contacts the trunk of the car, changing the sliding friction into rolling friction, which makes it easier to move the wheelchair 100 into the trunk, thus saving effort.

[0145] In one embodiment, the bracket 41 also has a third locking position relative to the frame 10.

[0146] When in the third card slot, refer Figure 12 The bracket 41 drives the assist roller 42 to unfold, so that the assist roller 42 extends below the bottom plane T; and the third position is located on the side of the second position away from the first position along the rotation path.

[0147] That is, the third locking position is the position where the bracket 41 rotates further from the first locking position through the second locking position.

[0148] For example, when in the third position, the assist roller 42 extends to the lower front of the front wheel 20.

[0149] In this way, when the frame 10 is in a folded state and the wheelchair 100 needs to be moved into the trunk of the car, the bracket 41 is in the third locking position, which not only allows the power rollers 42 to contact the trunk of the car for easy handling, but also can be used to handle taller trunks.

[0150] In other words, by using the second and third locking positions, the bracket 41 can be selectively extended to the second or third locking position for car trunks of different heights, making handling more flexible, convenient, and labor-saving.

[0151] Preferably, the first and second locking positions have a first rotation angle, which is between 70° and 100°. For example, 80°, 85°, 90°, 95°, and 100° are preferred.

[0152] The first and third locking positions have a second rotation angle, which is between 90° and 140°. Preferably, it is between 110° and 140°. For example, it is 110°, 115°, 120°, 125°, 130°, 135°, or 140°.

[0153] The second rotation angle is greater than the first rotation angle.

[0154] Furthermore, the bracket 41 and the frame 10 are connected by a pin mechanism to define the first locking position, the second locking position, and the third locking position.

[0155] Specifically, refer to Figure 10 The pin mechanism includes three pin holes 441, 442, and 443 and a pin 43.

[0156] Three pin holes 441, 442, and 443 are provided on the frame 10 (specifically the front wheel frame 13) and are distributed circumferentially around the power steering shaft 400. The three pin holes 441, 442, and 443 correspond to the first locking position, the second locking position, and the third locking position, respectively.

[0157] The pin 43 is movably mounted on the bracket 41 in the left-right direction, and its end can be inserted into three pin holes 441, 442, and 443 to restrict the relative rotation of the bracket 41 and the frame 10 (specifically the front wheel frame 13).

[0158] That is, when the pin 43 is inserted into a pin hole 441, as... Figure 5 As shown, bracket 41 is located in the first locking position.

[0159] When pin 43 is inserted into another pin hole 442, as Figure 11 As shown, bracket 41 is located in the second locking position.

[0160] When pin 43 is inserted into the remaining pin hole 443, as Figure 12 As shown, bracket 41 is located in the third locking position.

[0161] The pin hole 441 corresponding to the first locking position and the pin hole 442 corresponding to the second locking position help the center of the rotating shaft 400 to have a first central angle, which is equal to the first rotation angle.

[0162] The pin hole 441 corresponding to the first locking position and the pin hole 443 corresponding to the third locking position help the center of the rotating shaft 400 to have a second central angle, which is equal to the second rotation angle.

[0163] Furthermore, the pin mechanism also includes an elastic element.

[0164] The elastic element is disposed between the pin 43 and the bracket 41, and applies an elastic force toward the end of the pin 43.

[0165] The pin 43 is slidably disposed relative to the bracket 41, and correspondingly, the elastic element applies an elastic force toward the end of the pin 43 in the left-right direction.

[0166] Thus, when it is necessary to change the position of the bracket 41 between the first locking position, the second locking position and the third locking position, the pin 43 is pulled by hand so that the end of the pin 43 disengages from the currently located pin hole 441, 442 or 443, and this process overcomes the elastic force of the elastic element.

[0167] When the bracket 41 rotates to the desired pin hole 441, 442 or 443, the pin 43 is released. Driven by the elastic element, the pin 43 moves left and right relative to the bracket 41 and its end is inserted into the pin hole 441, 442 or 443 to complete the locking change.

[0168] In one embodiment, the elastic element is configured as a tension spring or a spring, but is not limited thereto.

[0169] Furthermore, the assist roller 42 includes a bracket 422 and three wheels 421. Of course, in a variant embodiment, the assist roller 42 can be configured as a single wheel structure.

[0170] As shown in the figure, the sub-support 422 is rotatably connected to the support 41 around the central axis 420, and the three wheels 421 are all rotatably connected to the sub-support 422 and are evenly arranged circumferentially around the central axis 420.

[0171] Thus, by setting up a structure with three wheels 421, when moving the wheelchair in an uneven trunk, the three wheels 421 alternately contact the trunk, making the wheelchair 100 move more smoothly and further achieving the effect of saving effort.

[0172] Furthermore, participants Figures 13 to 16 The wheelchair 100 also includes an anti-tipping component 50.

[0173] The anti-roll component 50 is rotatably connected to the frame 10 (specifically the rear wheel frame 14) around the anti-roll pivot 500, and in the rotation path, the anti-roll component 50 has an anti-roll position and a support position that are fixed relative to the frame 10.

[0174] Among them, participants Figure 13 When the anti-roll component 50 is in the anti-roll position, the anti-roll component 50 protrudes from below the rear wheel 30 and is located above the bottom plane T.

[0175] In this way, when the frame 10 is in the unfolded state, the anti-tipping component 50 is adjusted to the anti-tipping position, which not only does not affect the normal movement of the wheelchair 100, but also, once the wheelchair 100 tilts backward, the anti-tipping component 50 can support on the ground, thereby preventing the wheelchair 100 from tipping backward and increasing the safety of using the wheelchair 100.

[0176] Refer Figure 14 , when the anti-tipping component 50 is in the supporting position, the anti-tipping component 50 protrudes above the rear of the rear wheel 30. Obviously, at this time, the anti-tipping component 50 is still above the bottom plane T.

[0177] In this way, when the frame 10 is in the folded state, the anti-tipping component 50 is adjusted to the supporting position. At this time, if the wheelchair 100 is erected, the rear wheel 30 and the anti-tipping component 50 can be used to jointly support the wheelchair 100, making it more labor-saving to carry.

[0178] In one embodiment, the wheelchair 100 further includes a positioning pin 52, a positioning hole 53 and a second elastic member 54.

[0179] Among them, one of the positioning pin 52 and the positioning hole 53 is provided on the anti-tipping component 50, and the other is provided on the frame 10.

[0180] Moreover, the positioning pin 52 and the positioning hole 53 are inserted and matched to prevent the anti-tipping component 50 from rotating relative to the frame 10, so as to define one of the anti-tipping position and the supporting position.

[0181] The second elastic member 54 is arranged between the anti-tipping component 50 and the frame 10, and applies an elastic force to the anti-tipping component 50 towards the other of the anti-tipping position and the supporting position.

[0182] That is, by setting the second elastic member 54 and combining with the setting of the positioning pin 52 and the positioning hole 53, it is convenient for the anti-tipping component 50 to change between the anti-tipping position and the supporting position. For example, by pulling the positioning pin 52, the anti-tipping component 50 can be released to allow the anti-tipping component 50 to rotate from one of the anti-tipping position and the supporting position to the other of the anti-tipping position and the supporting position.

[0183] For example, in one embodiment, the positioning pin 52 and the positioning hole 53 are inserted and matched to prevent the anti-tipping component 50 from rotating relative to the frame 10, so as to define the anti-tipping position; the second elastic member 54 applies an elastic force to the anti-tipping component 50 towards the supporting position. Thus, when the anti-tipping component 50 is in the anti-tipping position, the positioning pin 52 is inserted into the positioning hole 53. At this time, by pulling the positioning pin 52, the anti-tipping component 50 can be released to allow the anti-tipping component 50 to rotate from the anti-tipping position to the supporting position under the drive of the second elastic member 54.

[0184] Of course, in a variation embodiment, the support position can also be defined by the insertion and engagement of the positioning pin 52 and the positioning hole 53, and correspondingly, the second elastic member 54 applies an elastic force toward the anti-tilt position to the anti-tilt assembly 50.

[0185] In summary, by movably setting the anti-tilt component 50, which has both an anti-tilt position and a support position, it not only prevents the wheelchair 100 from tipping backward during use, increasing the safety of the wheelchair 100, but also allows the wheelchair 100 to be supported by the anti-tilt component 50 and the rear wheels 30 when the wheelchair 100 is upright, freeing up the hands and making it easier to move and store. In addition, the anti-tilt position and support position can be easily changed through the cooperation of the positioning pin 52, positioning hole 53 and elastic element 54, making operation simple and convenient.

[0186] In other words, without increasing the cost of additional materials or adding additional parts, the anti-tilting component 50 achieves the dual requirements of anti-tilting and vertical storage, and is easy and efficient to operate with a simple structure.

[0187] Furthermore, the positioning pin 52 is movably mounted on the anti-tilt assembly 50 or the frame 10.

[0188] The wheelchair 100 also includes a third elastic element for applying an elastic force to the positioning pin 52 to drive the positioning pin 52 into the positioning hole 53.

[0189] In one embodiment, the positioning pin 52 is movably disposed on the anti-roll component 50, and the positioning hole 53 is disposed on the frame 10 (specifically, the rear wheel frame 14).

[0190] Wheelchair 100 also includes guide surface 55.

[0191] The guide surface 55 is set on the frame 10 (specifically, on the rear wheel frame 14) and adjacent to the positioning hole 53.

[0192] As the anti-tilt assembly 50 moves from the supported position to the anti-tilt position, the guide surface 55 abuts against and pushes the locating pin 52 (e.g., overcoming the elastic force of the second elastic element) to guide the locating pin 52 into the locating hole 53.

[0193] For example, when the locating pin 52 moves to the locating hole 53, driven by the second elastic element, the locating pin 52 moves relative to the anti-tilt assembly 50 so that its end is inserted into the locating hole 53.

[0194] Of course, in alternative embodiments, the positioning pin 52 may be movably disposed on the frame 10 (specifically the rear wheel frame 14), and the positioning hole 53 may be disposed on the anti-roll component 50.

[0195] Furthermore, the anti-tilt assembly 50 includes a support frame 511 and a support wheel 512.

[0196] One end of the support frame 511 is rotatably connected to the frame 10 around the anti-tilt shaft 500, specifically the rear of the rear wheel frame 14; the other end of the support frame 511 is equipped with a support wheel 512.

[0197] Correspondingly, the positioning pin 52 is movably mounted on the support frame 511, and the third elastic element is mounted between the positioning pin 52 and the support frame 511.

[0198] The second elastic element 54 is disposed between the support frame 511 and the frame 10, specifically between the support frame 511 and the rear wheel frame 14.

[0199] In one embodiment, the support frame 511 has a baffle 5111.

[0200] When the anti-roll component 50 is in the supported position, the baffle 5111 abuts against the frame 10 to limit the anti-roll component 50 from rotating further away from the supported position.

[0201] That is, when the anti-tilt component 50 rotates from the anti-tilt position to the support position, the rotation of the anti-tilt component 50 is stopped and cannot continue to rotate due to the cooperation between the baffle 5111 and the frame 10.

[0202] Furthermore, participants Figure 16 When the anti-tilt component 50 is in the supported position and the frame 10 is in the folded state and upright, the center of gravity of the wheelchair 100 is located between the rear wheel 30 and the anti-tilt component 50, so that it is supported by the rear wheel 30 and the anti-tilt component 50.

[0203] For example, such as Figure 16 As shown, with example line F as the horizontal ground, the rear wheel 30 and the anti-tilt component 50 are both supported on this horizontal ground F, and the center of gravity of the wheelchair 100 is between the contact point P1 of the rear wheel 30 and the contact point P2 of the anti-tilt component 50.

[0204] In summary, the beneficial effects of this utility model include: on the one hand, the armrest 15 and the backrest frame 11 are rotatably connected through the fifth pivot 195, and the other parts of the armrest 15 and the frame 10 no longer need a linkage mechanism, making the connection structure simple; on the other hand, through the pushing action of the front wheel frame 13 on the armrest 15, the armrest 15 is synchronously linked with the frame 10 when the wheelchair 100 is folded, and the armrest 15 folds automatically, eliminating the need for separate folding operations on the armrest 15. The overall operation is simple, and the frame 10 and the armrest 15 are folded simultaneously in one go.

[0205] In summary, this design avoids the need for excessive linkage structures due to the folding of the armrest 15, resulting in lower overall structural costs, a lighter wheelchair, and simple operation as the armrest 15 folds synchronously with the frame 10.

[0206] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0207] The detailed descriptions listed above are merely specific descriptions of feasible implementation methods of this utility model and are not intended to limit the scope of protection of this utility model. All equivalent implementation methods or modifications made without departing from the spirit of this utility model should be included within the scope of protection of this utility model.

Claims

1. A folding wheelchair, characterized in that, It includes a front wheel, a rear wheel, a frame, and armrests; the frame includes a front wheel frame, a rear wheel frame, a backrest frame, a seat frame, and a pivot assembly; The front wheel is rotatably connected to the front wheel frame, and the rear wheel is rotatably connected to the rear wheel frame; The backrest frame, seat frame, front wheel frame, and rear wheel frame are linked together by the pivot assembly to allow the frame to change between an unfolded state and a folded state. The rear part of the armrest is rotatably connected to the backrest frame via a fifth pivot. During the transition from the unfolded state to the folded state, the front wheel frame contacts the armrest to push the armrest to rotate relative to the backrest frame around the fifth pivot.

2. The folding wheelchair according to claim 1, characterized in that, The skeleton has an intermediate state between the unfolded state and the folded state; During the transition from the unfolded state to the intermediate state, the backrest frame, seat frame, front wheel frame, and rear wheel frame are linked together through the pivot assembly, and the armrest does not contact the front wheel frame and does not rotate relative to the backrest frame. During the transition from the intermediate state to the folded state, the backrest frame, seat frame, front wheel frame, and rear wheel frame continue to move in tandem through the pivot assembly, and the armrest rotates relative to the backrest frame around the fifth pivot under the push of the front wheel frame.

3. The folding wheelchair according to claim 2, characterized in that, When the backrest frame changes from the unfolded state to the folded state, it rotates relative to the seat frame by a first angle. When transitioning from the unfolded state to the intermediate state, the backrest frame rotates relative to the seat frame by a second angle; The second angle is 50-70% of the first angle; or, the first angle is 90°-110° and the second angle is 45°-65°.

4. The folding wheelchair according to claim 1, characterized in that, The front of the front wheel frame has a pushing part, and the front of the armrest has a force-receiving part; When the frame changes to a folded state, the pushing part contacts the force-receiving part to push the armrest to rotate upward relative to the backrest frame around the fifth pivot.

5. The folding wheelchair according to claim 1, characterized in that, The backrest frame includes: The frame is rotatably connected to the seat frame and the front wheel frame via the pivot assembly; and, The connecting seat is movably connected to the frame and can be self-locked to be fixed at different height positions on the frame; The handrail and the connecting seat are rotatably connected via a fifth rotating shaft.

6. The folding wheelchair according to claim 5, characterized in that, One of the handrail and the connecting seat is provided with a guide groove, and the other is provided with a guide post; The guide groove is an arc-shaped groove surrounding the fifth rotating axis; The guide post is inserted into the guide groove and moves between the two ends of the arc of the guide groove; In the unfolded state, the guide post is located at one end of the arc of the guide groove; in the folded state, the guide post is located at the other end of the arc of the guide groove.

7. The folding wheelchair according to claim 5, characterized in that, The rotating shaft assembly includes a first rotating shaft, a second rotating shaft, a third rotating shaft, and a fourth rotating shaft; The front wheel frame and the rear wheel frame are rotatably connected in a cross shape via a first pivot. The rear part of the front wheel frame is rotatably connected to the frame via a second pivot. The front part of the rear wheel frame is rotatably connected to the seat frame via a third pivot. The rear part of the seat frame is rotatably connected to the frame via a fourth pivot. In the unfolded state, within the vertical projection plane of the pivot assembly: the second pivot is located in front of the line connecting the first pivot and the fourth pivot; and the line connecting the second pivot and the fourth pivot and the line connecting the second pivot and the first pivot have an angle, and the angle is an obtuse angle and does not exceed 160°.

8. The folding wheelchair according to claim 1, characterized in that, Also includes: Assisted rollers; The bracket has a first end and a second end that are arranged opposite to each other; the first end is rotatably connected to the assist roller, and the second end is rotatably connected to the lower front part of the frame about the assist shaft, and has a first locking position, a second locking position and a third locking position that are fixed relative to the frame; When in the first locking position, the bracket drives the assist roller to be housed between the front wheel and the rear wheel, and is located above the bottom plane defined by the front wheel and the rear wheel; When in the second and third positions, the bracket drives the assist roller to extend below the bottom plane, and the third position is located on the side of the second position away from the first position along the rotation path.

9. The folding wheelchair according to claim 1, characterized in that, Also includes: The bracket has a first end and a second end that are disposed opposite to each other; the second end is rotatably connected to the lower front part of the frame about a power-assisting shaft, and the bracket has a first locking position and a second locking position that are fixed relative to the frame; The assisting roller includes a sub-bracket and three wheels. The sub-bracket is rotatably connected to the first end of the bracket around a central axis. The three wheels are all rotatably connected to the sub-bracket and are evenly arranged circumferentially around the central axis. When in the first locking position, the bracket drives the assist roller to be housed between the front wheel and the rear wheel, and is located above the bottom plane defined by the front wheel and the rear wheel; When in the second locking position, the bracket drives the assist roller to extend below the bottom plane.

10. The folding wheelchair according to claim 1, characterized in that, It also includes an anti-roll component, which is rotatably connected to the frame about an anti-roll axis and has an anti-roll position and a support position that are fixed relative to the frame; when in the anti-roll position, the anti-roll component extends below the rear wheel; when in the support position, the anti-roll component extends above the rear wheel. Positioning pins and positioning holes, one of which is located on the anti-tilt assembly, and the other is located on the frame; and, An elastic element is disposed between the anti-tilt assembly and the frame; When in the anti-tilt position, the positioning pin and positioning hole engage to prevent the anti-tilt assembly and the frame from rotating relative to each other, and the elastic element applies an elastic force to the anti-tilt assembly toward the support position.

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