wheelchair

Abstract

The utility model provides a kind of wheelchair.The wheelchair includes: framework;Front wheel and rear wheel are respectively rotationally connected on framework, and front wheel and rear wheel define bottom plane;Power-assisted roller;Support, with oppositely arranged first end and second end;First end rotationally connects power-assisted roller, second end rotationally connects the lower part in front of framework around power-assisted rotation shaft, and with the first detent, second detent and third detent fixed relative to the framework;When being located in first detent, support drives power-assisted roller to be housed between front wheel and rear wheel, and be located above bottom plane;When being located in second detent and third detent, support drives power-assisted roller to extend to below bottom plane, and third detent is located on the side of second detent away from first detent along rotation path.Such, for different height of automobile trunk, support can be selectively unfolded to second detent or third detent, and it is more flexible, more convenient and more labor-saving to carry.

Description

Technical Field

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

[0002] A wheelchair is a device used to help people with mobility impairments move around. It provides body support and balance, allowing users to move independently indoors or outdoors.

[0003] When users travel by wheelchair, they often need to load the wheelchair into the trunk of a car to facilitate longer journeys. Some wheelchairs now include assistive devices for easy transport, but these devices are often impractical and become unusable.

[0004] In particular, different cars have different trunk height settings, and existing wheelchair assistive devices cannot be well adapted, making them inconvenient to use. Utility Model Content

[0005] To address the problem of the inconvenience of transporting wheelchairs to trunks of varying heights, the purpose of this utility model is to provide a wheelchair.

[0006] To achieve the above objectives, one embodiment provides a wheelchair. The wheelchair includes: skeleton; The front wheel and the rear wheel are rotatably connected to the frame, and the front wheel and the rear wheel define the bottom plane; 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 stored between the front wheel and the rear wheel, and is located above the bottom plane; 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.

[0007] In a preferred embodiment, the first locking position, the second locking position, and the third locking position are defined by a pin mechanism between the bracket and the frame.

[0008] In a preferred embodiment, the pin mechanism includes: Three pin holes are formed on the frame and distributed circumferentially around the power steering shaft, the three pin holes corresponding to the first locking position, the second locking position, and the third locking position, respectively; and... A pin is movably mounted on the bracket in the left-right direction, and its end can be inserted into the three pin holes to restrict the relative rotation of the bracket and the frame.

[0009] In a preferred embodiment, the pin mechanism further includes: An elastic element is disposed between the pin and the bracket, and applies an elastic force toward the end of the pin.

[0010] In a preferred embodiment, the first card slot and the second card slot have a first rotation angle, the angle of the first rotation angle being 70° to 100°; The first and third positions have a second rotation angle, which is between 90° and 140°, and the second rotation angle is greater than the first rotation angle.

[0011] In a preferred embodiment, the assisting roller includes a sub-bracket and three wheels. The sub-bracket is rotatably connected to the bracket around a central axis, and the three wheels are all rotatably connected to the sub-bracket and are evenly arranged circumferentially around the central axis.

[0012] In a preferred embodiment, the frame includes a backrest frame, a seat frame, a front wheel frame, a rear wheel frame, and four pivots; the second end of the bracket is rotatably connected to the front wheel frame around the power-assist pivot; the backrest frame, seat frame, front wheel frame, and rear wheel frame are linked through the four pivots to allow the frame to change between an unfolded state and a folded state. The frame also includes an armrest, the rear of which 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 abuts against the armrest and pushes the armrest to rotate relative to the backrest frame.

[0013] In a preferred embodiment, the four rotating shafts include 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 backrest 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 backrest frame via a fourth pivot. In the unfolded state, within the vertical projection plane of the four rotating axes: the second rotating axis is located in front of the line connecting the first and fourth rotating axes; and the line connecting the second and fourth rotating axes and the line connecting the second and first rotating axes form an angle, wherein the angle is obtuse and does not exceed 160°.

[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 so that the anti-tilt assembly has an anti-tilt position and a support position relative to the frame. When in the anti-roll position, the anti-roll assembly protrudes below the rear wheel and is located above the bottom plane; When in the supported position, the anti-tilt component protrudes above and behind the rear wheel, and when the frame is folded and upright, the center of gravity of the wheelchair is located between the rear wheel and the anti-tilt component, so that it is supported by the rear wheel and the anti-tilt component together.

[0015] In a preferred embodiment, the wheelchair further includes: 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.

[0016] Compared with the prior art, the beneficial effects of one embodiment of this utility model are as follows: by setting up a bracket and assisting rollers, and making the bracket have a first to a third locking position, wherein the first locking position is a storage position, and the second and third locking positions are two unfolding positions with different heights / rotation angles, the bracket can be selectively unfolded to the second or third locking position for car trunks of different heights, making the handling more flexible, convenient and labor-saving. Attached Figure Description

[0017] 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 a 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 a wheelchair; Figure 5 This is a perspective view of a wheelchair in a folded state according to an embodiment, with a partial magnification of region C; Figure 6 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 7Is a side view of a wheelchair in a folded state according to an embodiment, where the exemplary power assist mechanism is in the third clamping position; Figure 8 Is a side view of a wheelchair according to an embodiment in a state between the unfolded state and the folded state; Figure 9 Is Figure 1 A partial enlarged view of region D in Figure 10 Is Figure 3 A partial enlarged view of region E in Figure 11 Is Figure 10 A partial enlarged structural decomposition view of region E in Detailed implementation manners

[0018] The following will describe the present application in detail in conjunction with the specific implementation manners shown in the accompanying drawings. However, these implementation manners are only used to illustrate the present utility model and do not limit the scope of the present application. Structural, method, or functional transformations made by those of ordinary skill in the art based on these implementation manners are all included within the protection scope of the present application.

[0019] 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.

[0020] Spatial relative position terms such as "upper", "above", "lower", "below", etc. used herein are for the purpose of facilitating description of the relationship of one unit or feature relative to another unit or feature as shown in the accompanying drawings. The spatial relative position terms can be intended to include different orientations of the device in use or operation other than the orientation shown in the figures. For example, if the device in the figure is flipped, the unit described as being "below" or "beneath" other units or features will be located "above" other units or features. Therefore, the exemplary term "below" can encompass both the upper and lower orientations. The device can be oriented in other ways (rotated 90 degrees or other orientations), and the spatially related descriptive terms used herein can be interpreted accordingly.

[0021] Refer Figure 1 , An embodiment of the present utility model provides a wheelchair 100, which can specifically be a foldable wheelchair 100, an electric foldable wheelchair 100. Of course, the present application is not limited thereto.

[0022] The wheelchair 100 includes a frame 10, front wheels 20, and rear wheels 30.

[0023] 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.

[0024] The number of rear wheels 30 is set to a pair, which are rotatably connected to the lower rear part of the frame 10.

[0025] When the wheelchair 100 is configured as an electric wheelchair, the rear wheel 30 can be configured as a drive wheel.

[0026] The front wheel 20 and the rear wheel 30 can jointly define the bottom plane T, which is a virtual plane.

[0027] In this application, it is understood that the bottom plane T defined by the front wheel 20 and the rear wheel 30 is used as a reference, and the front-to-back direction and the left-to-right direction are parallel to the bottom plane T; the height direction is the direction perpendicular to the bottom plane T.

[0028] When the wheelchair 100 is placed on a support platform, such as on the ground, the front wheels 20 and the rear wheels 30 are in contact with the ground, and the bottom plane T overlaps with the ground.

[0029] The skeleton 10 has an unfolded state and a folded state.

[0030] Among them, such as Figure 1 and Figure 2 As shown, in the unfolded state, the frame 10 can be used by a user to sit on.

[0031] like Figure 3 and Figure 4 As shown, in the folded state, the user cannot sit directly on the frame 10.

[0032] In this application, wheelchair 100 also includes assistive device 40.

[0033] 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).

[0034] Specifically, refer to Figure 5 The assist mechanism 40 includes an assist roller 42 and a bracket 41.

[0035] The bracket 41 has a first end and a second end.

[0036] The first end of the bracket 41 (e.g.) Figure 5 The lower end of the middle is rotatably connected to a power-assisted roller 42.

[0037] The second end of the bracket 41 (e.g.) Figure 5 The upper end of the bracket 41 is rotatably connected to the lower front part of the frame 10 around the assist shaft 400, and the bracket 41 has a first locking position, a second locking position and a third locking position fixedly connected to the frame 10.

[0038] When in the first card position, refer Figure 4The 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.

[0039] 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.

[0040] When in the second card slot, refer Figure 6 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 located below the front wheel 20.

[0041] 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.

[0042] When in the third card slot, refer Figure 7 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.

[0043] 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.

[0044] For example, when in the third position, the assist roller 42 extends to the lower front of the front wheel 20.

[0045] 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.

[0046] In other words, the first locking position is the storage position of the assist mechanism 40, and the second and third locking positions are two unfolding positions of the assist mechanism 40 at different heights / rotation angles. Through the second and third locking positions, the bracket 41 can be selectively unfolded to the second or third locking position for car trunks of different heights, making the handling more flexible, convenient and labor-saving.

[0047] 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.

[0048] 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°.

[0049] The second rotation angle is greater than the first rotation angle.

[0050] 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.

[0051] Specifically, refer to Figure 5 The pin mechanism includes three pin holes 441, 442, and 443 and a pin 43.

[0052] Three pin holes 441, 442, and 443 are formed on the frame 10 and distributed circumferentially around the power-assisted rotating 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.

[0053] 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.

[0054] That is, when the pin 43 is inserted into a pin hole 441, as... Figure 4 As shown, bracket 41 is located in the first locking position.

[0055] When pin 43 is inserted into another pin hole 442, as Figure 6 As shown, bracket 41 is located in the second locking position.

[0056] When pin 43 is inserted into the remaining pin hole 443, as Figure 7 As shown, bracket 41 is located in the third locking position.

[0057] 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.

[0058] 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.

[0059] Furthermore, the pin mechanism also includes a flexible element.

[0060] An elastic element is disposed between the pin 43 and the bracket 41, and applies an elastic force toward the end of the pin 43.

[0061] The pin 43 is slidably positioned relative to the bracket 41, and correspondingly, the elastic force is along the left and right direction.

[0062] 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.

[0063] 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.

[0064] In one embodiment, the elastic element is configured as a tension spring or a spring, but is not limited thereto.

[0065] 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.

[0066] 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.

[0067] Thus, by setting it into a three-wheel 421 structure, the effort-saving effect can be further achieved.

[0068] Furthermore, the skeleton 10 is configured as a foldable structure, which can be implemented in any feasible manner in the art.

[0069] In this embodiment, a preferred structure of the skeleton 10 is provided, but this application is not limited thereto.

[0070] Specifically, re-participation Figures 1 to 4 The frame 10 can adopt a four-bar folding mechanism.

[0071] The frame 10 includes a backrest frame 11, a seat frame 12, a front wheel frame 13, and a rear wheel frame 14.

[0072] The seat frame 12 can be used to install a seat cushion for users to sit on.

[0073] The backrest frame 11 can be used to install a backrest for the user to lean against.

[0074] The front part of the front wheel frame 13 is rotatably connected to the front wheel 20, for example, it can be rotatably connected about the front axle.

[0075] 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 axle.

[0076] When the wheelchair 100 is configured as an electric wheelchair, the rear wheel frame 14 may also integrate a power supply and a drive motor. Of course, this application is not limited to this.

[0077] The backrest frame 11, seat frame 12, front wheel frame 13 and rear wheel frame 14 are linked by four pivots to allow the frame 10 to switch between an unfolded state and a folded state.

[0078] In one embodiment, the reference Figure 2 The four rotating shafts include a first rotating shaft 191, a second rotating shaft 192, a third rotating shaft 193, and a fourth rotating shaft 194.

[0079] 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.

[0080] The rear of the front wheel frame 13 is rotatably connected to the backrest frame 11 via the second pivot 192.

[0081] The front part of the rear wheel frame 14 is rotatably connected to the seat frame 12 via a third pivot 193.

[0082] The rear of the seat frame 12 is rotatably connected to the backrest frame 11 via the fourth pivot 194.

[0083] Thus, when the wheelchair 100 needs to be stored, the frame 10 can be changed from an unfolded state to a folded state.

[0084] 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.

[0085] In one embodiment, the reference Figure 2 In the unfolded state, the vertical projection planes of the four rotating axes 191, 192, 193, and 194 (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°.

[0086] That is, the included angle A is greater than 90° and less than or equal to 160°.

[0087] Thus, 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 less likely to start folding accidentally, making it safer to use.

[0088] Preferably, the included angle A is 140°~160°.

[0089] More preferably, the included angle A is 150°~160°, for example 150°, 152°, 153°, 154°, 155°, 156°, 157°, 158°, 159°, 160°.

[0090] Among them, the four rotating shafts 191, 192, 193 and 194 are parallel and extend in the left and right direction.

[0091] Furthermore, participants Figure 1 and Figure 2 The frame 10 also includes a locking mechanism 16.

[0092] The locking mechanism 16 is used to lock the frame 10 in the deployed state.

[0093] Specifically, in the unfolded state, the backrest frame 11 and the front wheel frame 13 are connected by a locking mechanism 16 to restrict their relative rotation.

[0094] 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.

[0095] The specific structure of the locking mechanism 16 can be implemented in any feasible manner in the art, and will not be described in detail in this application.

[0096] Furthermore, the skeleton 10 also includes a second locking mechanism 17.

[0097] The second locking mechanism 17 is used to lock the frame 10 in a folded state.

[0098] 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 17 to limit them from moving away from each other.

[0099] Similarly, the specific structure of the second locking mechanism 17 can be implemented in any feasible manner in the art, and will not be described in detail in this application.

[0100] Further, see Figure 1 and Figure 8 The frame 10 also includes handrails 15.

[0101] The rear of the armrest 15 is rotatably connected to the backrest frame 11 via a fifth pivot.

[0102] In one embodiment, during the process of changing from an unfolded state to a folded state, such as Figure 8 As shown, the front wheel frame 13 abuts against the armrest 15 and pushes the armrest 15 to rotate relative to the backrest frame 11.

[0103] Thus, 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 be directly linked and folded under the support of the front wheel frame 13, making the folding operation of the entire wheelchair 100 more convenient and simple.

[0104] Specifically, during the process of changing from the unfolded state to the folded state, the front part 131 of the front wheel frame 13 abuts against the lower front part of the armrest 15, thereby pushing the front part of the armrest 15 to rotate upward relative to the backrest frame 11, so that the positional relationship between the armrest 15 and the backrest frame 11 changes from approximately perpendicular to basically parallel.

[0105] The number of handrails 15 is set to two, namely, the left handrail 15 and the right handrail 15.

[0106] 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.

[0107] In another embodiment, the backrest frame 11 also includes a frame and a connecting seat 111.

[0108] The rear end of the handrail 15 is rotatably connected to the connecting seat 111 via the fifth pivot.

[0109] Furthermore, the connecting seat 111 is slidably mounted on the frame to drive the armrest 15 to move up and down; and the connecting seat 111 can be self-locked at different heights of the frame, so that the user can adjust the appropriate height of the armrest 15.

[0110] The sliding connection structure and self-locking method between the connecting seat 111 and the frame can be implemented by any feasible method in the art, and will not be elaborated herein.

[0111] Further, refer Figures 9 to 11 , the wheelchair 100 further includes an anti-tipping component 50.

[0112] The anti-tipping component 50 is rotatably connected to the skeleton 10 around the anti-tipping rotating shaft 500, so that the anti-tipping component 50 has an anti-tipping position and a supporting position relative to the skeleton 10.

[0113] Among them, refer Figure 9 , when the anti-tipping component 50 is in the anti-tipping position, the anti-tipping component 50 protrudes below the rear of the rear wheel 30 and is located above the bottom plane T defined by the front wheel 20 and the rear wheel 30.

[0114] In this way, when the skeleton 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 use safety of the wheelchair 100.

[0115] Refer Figure 10 , 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 located above the bottom plane T defined by the front wheel 20 and the rear wheel 30.

[0116] In this way, when the skeleton 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 easier to carry.

[0117] Preferably, when the anti-tipping component 50 is in the supporting position, if the skeleton 10 is in the folded state and erected, the center of gravity of the wheelchair 100 is located between the rear wheel 30 and the anti-tipping component 50, so as to be jointly supported by the rear wheel 30 and the anti-tipping component 50. In this way, not only can the hands be freed, but also it is convenient to stably store the wheelchair 100 erected.

[0118] In one embodiment, the wheelchair 100 further includes a positioning pin 52, a positioning hole 53 and a second elastic member 54.

[0119] Among them, one of the positioning pin 52 and the positioning hole 53 is arranged on the anti-tipping component 50, and the other is arranged on the skeleton 10.

[0120] And, the positioning pin 52 and the positioning hole 53 are inserted and matched to define one of the anti-tipping position and the supporting position.

[0121] The second elastic element 54 is disposed between the anti-tilt assembly 50 and the frame 10, and applies an elastic force to the anti-tilt assembly 50 toward the other of the anti-tilt position and the support position.

[0122] That is, by setting the second elastic element 54, combined with the positioning pin 52 and the positioning hole 53, the anti-tilt component 50 can be easily changed between the anti-tilt position and the support position. For example, by pulling the positioning pin 52, the anti-tilt component 50 can be released, allowing the anti-tilt component 50 to rotate from one of the anti-tilt position and the support position to the other of the anti-tilt position and the support position.

[0123] For example, in one embodiment, the positioning pin 52 and the positioning hole 53 are engaged to define the anti-tilt position; the second elastic member 54 applies an elastic force toward the support position to the anti-tilt assembly 50. Thus, when the anti-tilt assembly 50 is in the anti-tilt position, the positioning pin 52 is inserted into the positioning hole 53. At this time, pulling the positioning pin 52 releases the anti-tilt assembly 50, allowing the anti-tilt assembly 50 to rotate from the anti-tilt position to the support position under the drive of the second elastic member 54.

[0124] 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.

[0125] Furthermore, the positioning pin 52 is movably mounted on the anti-tilt assembly 50 or the frame 10.

[0126] 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.

[0127] 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).

[0128] Wheelchair 100 also includes guide surface 55.

[0129] The guide surface 55 is set on the frame 10 (specifically on the rear wheel frame 14) and is adjacent to the positioning hole 53.

[0130] As the anti-tilt assembly 50 moves from the support 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 third elastic element) to guide the locating pin 52 into the locating hole 53.

[0131] For example, when the locating pin 52 moves to the locating hole 53, driven by the third 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.

[0132] 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.

[0133] Furthermore, the anti-tilt assembly 50 includes a support frame 511 and a support wheel 512.

[0134] 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.

[0135] 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.

[0136] 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.

[0137] In one embodiment, the support frame 511 has a baffle 5111.

[0138] 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.

[0139] 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.

[0140] In summary, the beneficial effects of this utility model include: by setting up a bracket 41 and a power-assisted roller 42, and by making the bracket 41 have a first to a third locking position, wherein the first locking position is a storage position, and the second and third locking positions are two unfolding positions with different heights / rotation angles, the bracket 41 can be selectively unfolded to the second or third locking position for car trunks of different heights, making handling more flexible, convenient and labor-saving.

[0141] 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.

[0142] 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 wheelchair, characterized in that, include: skeleton; The front wheel and the rear wheel are rotatably connected to the frame, and the front wheel and the rear wheel define the bottom plane; 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 stored between the front wheel and the rear wheel, and is located above the bottom plane; 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.

2. The wheelchair according to claim 1, characterized in that, The bracket and the frame are fixedly connected by a pin mechanism to define the first locking position, the second locking position and the third locking position.

3. The wheelchair according to claim 2, characterized in that, The pin mechanism includes: Three pin holes are formed on the frame and distributed circumferentially around the power steering shaft, the three pin holes corresponding to the first locking position, the second locking position, and the third locking position, respectively; and... A pin is movably mounted on the bracket in the left-right direction, and its end can be inserted into the three pin holes to restrict the relative rotation of the bracket and the frame.

4. The wheelchair according to claim 3, characterized in that, The pin mechanism also includes: An elastic element is disposed between the pin and the bracket, and applies an elastic force toward the end of the pin.

5. The wheelchair according to claim 1, characterized in that, The first and second positions have a first rotation angle, which is between 70° and 100°. The first and third positions have a second rotation angle, which is between 90° and 140°, and the second rotation angle is greater than the first rotation angle.

6. The wheelchair according to claim 1, characterized in that, The assist roller includes a sub-bracket and three wheels. The sub-bracket is rotatably connected to the bracket around a central axis, and the three wheels are all rotatably connected to the sub-bracket and are evenly arranged circumferentially around the central axis.

7. The wheelchair according to claim 1, characterized in that, The frame includes a backrest frame, a seat frame, a front wheel frame, a rear wheel frame, and four rotating shafts; the second end of the bracket is rotatably connected to the front wheel frame around the power-assisting rotating shaft; the backrest frame, seat frame, front wheel frame, and rear wheel frame are linked through the four rotating shafts to allow the frame to change between an unfolded state and a folded state. The frame also includes an armrest, the rear of which 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 abuts against the armrest and pushes the armrest to rotate relative to the backrest frame.

8. The wheelchair according to claim 7, characterized in that, The four rotating shafts include 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 backrest 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 backrest frame via a fourth pivot. In the unfolded state, within the vertical projection plane of the four rotating axes: the second rotating axis is located in front of the line connecting the first and fourth rotating axes; and the line connecting the second and fourth rotating axes and the line connecting the second and first rotating axes form an angle, wherein the angle is obtuse and does not exceed 160°.

9. The wheelchair according to claim 1, characterized in that, It also includes an anti-tilt assembly, which is rotatably connected to the frame about an anti-tilt pivot, so that the anti-tilt assembly has an anti-tilt position and a support position relative to the frame; When in the anti-roll position, the anti-roll assembly protrudes below the rear wheel and is located above the bottom plane; When in the supported position, the anti-tilt component protrudes above and behind the rear wheel, and when the frame is folded and upright, the center of gravity of the wheelchair is located between the rear wheel and the anti-tilt component, so that it is supported by the rear wheel and the anti-tilt component together.

10. The wheelchair according to claim 9, characterized in that, The wheelchair also includes: 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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