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;Support, with oppositely arranged first end and second end;Second end is rotationally connected on the lower part of framework around power-assisted rotating shaft, and with the first clamping position and second clamping position of the fixed relative to the framework;Power-assisted roller, including branch support and three wheels, branch support is rotationally connected on the first end of support around center rotating shaft, and three wheels are all rotationally connected on branch support, and are arranged in uniform around center rotating shaft in circumference;Wherein, when being located first clamping position, support drives power-assisted roller to be housed between front wheel and rear wheel, and is located above bottom plane;When being located second clamping position, support drives power-assisted roller to extend to below bottom plane.Not only can provide power in wheelchair handling, and for uneven trunk, three wheels contact trunk alternately, and wheelchair moves more smoothly.

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 move the wheelchair to 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 thus become unusable. Utility Model Content

[0004] In order to solve the problem of the inconvenience of moving wheelchairs to high places, the purpose of this utility model is to provide a wheelchair.

[0005] 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; The bracket has a first end and a second end that are arranged opposite to each other; the second end is rotatably connected to the lower front part of the frame about a power-assisted pivot, and 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 stored between the front wheel and the rear wheel, and is located above the bottom plane; When in the second locking position, the bracket drives the assist roller to extend below the bottom plane.

[0006] 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 shaft; The backrest frame, seat frame, front wheel frame, and rear wheel frame are linked by the four pivots to allow the frame to switch between an unfolded state and a folded state.

[0007] In a preferred embodiment, the bracket further has a third locking position relative to the frame; When in the third position, 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.

[0008] 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.

[0009] In a preferred embodiment, the pin mechanism includes: Three pin holes are formed on the front wheel bracket 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 front wheel frame.

[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 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°.

[0012] In a preferred embodiment, the frame further includes armrests, the rear of which are 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, so that the armrest is stored on the side of the backrest frame.

[0013] 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.

[0014] 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.

[0015] Compared with the prior art, the beneficial effects of one embodiment of this utility model are as follows: not only by setting a first locking position (as a storage position for the assist roller) and a second locking position (as an assist position for the assist roller), the assist roller can provide assistance in wheelchair transportation. For example, when transporting to the trunk of a car, the assist roller can be supported inside the trunk, so that the wheelchair can enter the trunk more smoothly; moreover, by setting the assist roller to a three-wheel structure, when moving the wheelchair in an uneven trunk, the three wheels alternately contact the trunk, making the wheelchair move more smoothly, and further achieving the effect of saving effort and convenience. 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 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 3 yes Figure 2 Side view of the wheelchair; Figure 4 This is a perspective view of a wheelchair in a folded state according to an embodiment; Figure 5 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 6 yes Figure 4 A magnified view of a portion of region C in the middle; Figure 7FIG. 0 is a side view of a wheelchair according to an embodiment in a folded state, wherein the exemplary boosting mechanism is in the third locking position; Figure 8 is Figure 1 a side view of the wheelchair in Figure 9 FIG. 8 is a side view of a wheelchair according to an embodiment in a state between the unfolded state and the folded state; Figure 10 is Figure 1 a partial enlarged view of region D in Figure 11 is Figure 2 a partial enlarged view of region E in Figure 12 is Figure 11 a partial enlarged exploded view of the structure of region E in DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The present application will be described in detail below in conjunction with the specific embodiments shown in the accompanying drawings. However, these embodiments are only used to illustrate the present invention 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 in the protection scope of the present application.

[0018] In the various diagrams 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] 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 to another unit or feature as shown in the accompanying drawings. The spatial relative position terms are 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 figures is flipped, the unit described as being "below" or "beneath" another unit or feature will be located "above" the other unit or feature. Therefore, the exemplary term "below" can encompass both the upper and lower orientations. The device may be oriented in other ways (rotated 90 degrees or other orientations), and the spatially related descriptive terms used herein are to be interpreted accordingly.

[0020] Refer Figure 1 , an embodiment of the present invention 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.

[0021] The wheelchair 100 includes a frame 10, front wheels 20, and rear wheels 30.

[0022] The number of front wheels 20 is set to a pair, which are rotatably connected to the lower front part of the frame 10.

[0023] The number of rear wheels 30 is set to a pair, which are rotatably connected to the lower rear part of the frame 10.

[0024] When the wheelchair 100 is configured as an electric wheelchair, the rear wheel 30 can be configured as a drive wheel.

[0025] The front wheel 20 and the rear wheel 30 can jointly define the bottom plane T, which is a virtual plane.

[0026] 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.

[0027] 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.

[0028] The skeleton 10 has an unfolded state and a folded state.

[0029] Among them, such as Figure 1 As shown, in the unfolded state, the frame 10 can be used by a user to sit on.

[0030] like Figures 2 to 4 As shown, in the folded state, the user cannot sit directly on the frame 10.

[0031] In this application, wheelchair 100 also includes assistive device 40.

[0032] 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).

[0033] Specifically, the assist mechanism 40 includes an assist roller 42 and a bracket 41.

[0034] The bracket 41 has a first end and a second end.

[0035] The first end of the bracket 41 (e.g.) Figure 4 The lower end of the middle is rotatably connected to a power-assisted roller 42.

[0036] The second end of the bracket 41 (e.g.) Figure 4 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 and a second locking position that are fixedly connected to the frame 10.

[0037] When in the first card position, refer Figure 2 and Figure 3, the support 41 drives the assisting roller 42 to be received between the front wheel 20 and the rear wheel 30 and above the bottom plane T.

[0038] In this way, when the frame 10 is in the unfolded state and the support 41 is in the first position, with the front wheel 20 and the rear wheel 30 on the ground, the assisting mechanism 40 does not contact the ground, thus not affecting the normal use of the wheelchair 100.

[0039] When in the second position, referring to Figure 4 and Figure 5 , the support 41 drives the assisting roller 42 to unfold, such that the assisting roller 42 extends below the bottom plane T. For example, specifically it can be below (or front-lower) the front wheel 20.

[0040] In this way, when the frame 10 is in the folded state and the wheelchair 100 needs to be carried into the trunk of a car, the support 41 is in the second position, so that the assisting roller 42 contacts the trunk of the car, changing the sliding friction to rolling friction, and thus facilitating the carrying of the wheelchair 100 into the trunk, which can save effort.

[0041] In the present application, continuing to refer to Figure 4 , the assisting roller 42 includes a sub-support 422 and three wheels 421.

[0042] The sub-support 422 is rotationally connected to the support 41 around a central rotating shaft 420, and the three wheels 421 are all rotationally connected to the sub-support 422 and are circumferentially and evenly arranged around the central rotating shaft 420.

[0043] In this way, for the wheelchair 100 of this embodiment, not only by setting the first position (as the receiving position of the assisting roller 42) and the second position (as the assisting position of the assisting roller 42), the assisting roller 42 can provide assistance during the carrying of the wheelchair 100. For example, when carrying the wheelchair 100 into the trunk of a car, the assisting roller 42 can support inside the trunk, so that the wheelchair 100 can enter the trunk more smoothly; moreover, by setting the assisting roller 42 into a structure of three wheels 42, when moving the wheelchair in an uneven trunk, the three wheels 421 alternately contact the trunk, and the wheelchair 100 moves more smoothly, which can further achieve the effects of saving effort and convenience.

[0044] Referring to Figure 6 and Figure 7 , further preferably, in one embodiment, the support 41 further has a third position relative to the frame 10.

[0045] When in the third position, referring to Figure 7 , the support 41 drives the assisting roller 42 to unfold, such that the assisting 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.

[0046] 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.

[0047] For example, when in the third position, the assist roller 42 extends to the lower front of the front wheel 20.

[0048] As can be seen, the third locking position is another assist position of the assist mechanism 40, and this assist position corresponds to different heights / rotation angles of the assist mechanism 40 compared to the second locking position.

[0049] In this way, when the frame 10 is in a folded state and the wheelchair 100 needs to be moved into the trunk of a car, the second and third locking positions can be used to selectively unfold the support 41 to the second or third locking position for different heights of the trunk. For example, when the trunk is low, it can be unfolded to the second locking position, and when the trunk is high, it can be unfolded to the third locking position, making the movement more flexible, convenient and less strenuous.

[0050] 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.

[0051] That is, the change from the first card position to the second card position has a first rotation angle.

[0052] 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°.

[0053] That is, the change from the first card position to the third card position has a first rotation angle.

[0054] The second rotation angle is greater than the first rotation angle.

[0055] 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.

[0056] Specifically, refer to Figure 4 and Figure 6 The pin mechanism includes three pin holes 441, 442, and 443 and a pin 43.

[0057] 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.

[0058] 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.

[0059] That is, when the pin 43 is inserted into a pin hole 441, as... Figure 3 As shown, bracket 41 is located in the first locking position.

[0060] When pin 43 is inserted into another pin hole 442, as Figure 5 As shown, bracket 41 is located in the second locking position.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] Furthermore, the pin mechanism also includes a flexible element.

[0065] 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.

[0066] The pin 43 is slidably positioned relative to the bracket 41, and correspondingly, the elastic force is along the left and right direction.

[0067] 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.

[0068] 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.

[0069] In one embodiment, the elastic element is configured as a tension spring or a spring, but is not limited thereto.

[0070] Furthermore, the skeleton 10 is configured as a foldable structure, which can be implemented in any feasible manner in the art.

[0071] In this embodiment, a preferred structure of the skeleton 10 is provided, but this application is not limited thereto.

[0072] Specifically, re-participation Figure 8 The frame 10 can adopt a four-bar folding mechanism.

[0073] The frame 10 includes a backrest frame 11, a seat frame 12, a front wheel frame 13, and a rear wheel frame 14.

[0074] The seat frame 12 can be used to install a seat cushion for users to sit on.

[0075] The backrest frame 11 can be used to install a backrest for the user to lean against.

[0076] 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.

[0077] Furthermore, the power assist mechanism 40 is connected to the front wheel frame 13. For example, the second end of the bracket 41 is rotatably connected to the front of the front wheel frame 13 about the power assist shaft 400.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] In one embodiment, 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.

[0082] 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.

[0083] The rear of the front wheel frame 13 is rotatably connected to the backrest frame 11 via the second pivot 192.

[0084] The front part of the rear wheel frame 14 is rotatably connected to the seat frame 12 via a third pivot 193.

[0085] The rear of the seat frame 12 is rotatably connected to the backrest frame 11 via the fourth pivot 194.

[0086] Thus, when the wheelchair 100 needs to be stored, the frame 10 can be changed from an unfolded state to a folded state.

[0087] 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.

[0088] In one embodiment, in the unfolded state, the vertical projection planes of the four rotation axes 191, 192, 193, and 194 (e.g., ...) are... Figure 8 (From the perspective) The second pivot 192 is located in front of the line connecting the first pivot 191 and the fourth pivot 194; and the line connecting the second pivot 192 and the fourth pivot 194 and the line connecting the second pivot 192 and the first pivot 191 forms an angle A, and the angle A is an obtuse angle and does not exceed 160°.

[0089] That is, the included angle A is greater than 90° and less than or equal to 160°.

[0090] 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.

[0091] Preferably, the included angle A is 140°~160°.

[0092] More preferably, the included angle A is 150°~160°, for example 150°, 152°, 153°, 154°, 155°, 156°, 157°, 158°, 159°, 160°.

[0093] Among them, the four rotating shafts 191, 192, 193 and 194 are parallel and extend in the left and right direction.

[0094] Furthermore, participants Figure 8 The frame 10 also includes a locking mechanism 16.

[0095] The locking mechanism 16 is used to lock the frame 10 in the deployed state.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] Furthermore, the skeleton 10 also includes a second locking mechanism 17.

[0100] The second locking mechanism 17 is used to lock the frame 10 in a folded state.

[0101] 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.

[0102] 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.

[0103] Further, see Figure 9 The frame 10 also includes handrails 15.

[0104] The rear of the armrest 15 is rotatably connected to the backrest frame 11 via a fifth pivot.

[0105] In one embodiment, during the transition from an unfolded state to a folded state, the front wheel frame 13 abuts against the armrest 15 and pushes the armrest 15 to rotate relative to the backrest frame 11.

[0106] 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.

[0107] 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 (e.g., resting against the side of the backrest frame 11).

[0108] The number of handrails 15 is set to two, namely, the left handrail 15 and the right handrail 15.

[0109] When the wheelchair 100 is set as an electric wheelchair, a controller 150 is provided on one of the two armrests 15. For example, the controller 150 is provided at the front end of the right armrest 15 to facilitate the user to control the movement of the wheelchair 100.

[0110] In addition, in one embodiment, the backrest frame 11 further includes a frame and a connecting seat 111.

[0111] The rear end of the armrest 15 is rotatably connected to the connecting seat 111 through a fifth rotating shaft.

[0112] Furthermore, the connecting seat 111 is slidably arranged 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 as to allow the user to adjust the appropriate height of the armrest 15.

[0113] The sliding connection structure and the 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.

[0114] Furthermore, referring Figures 10 to 12 , the wheelchair 100 further includes an anti-tipping component 50.

[0115] The anti-tipping component 50 is rotatably connected to the frame 10 around an anti-tipping rotating shaft 500, so that the anti-tipping component 50 has an anti-tipping position and a supporting position relative to the frame 10.

[0116] Among them, referring Figure 10 , 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.

[0117] 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 use safety of the wheelchair 100.

[0118] Referring Figure 11 , 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.

[0119] 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.

[0120] Preferably, when the anti-tilt component 50 is in the supported position, if 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 the wheelchair 100 is supported by the rear wheel 30 and the anti-tilt component 50 together. In this way, not only can the hands be freed, but the wheelchair 100 can also be stably uprighted and stored.

[0121] In one embodiment, the reference Figure 12 The wheelchair 100 also includes a positioning pin 52, a positioning hole 53, and a second elastic element 54.

[0122] Among them, one of the positioning pins 52 and positioning holes 53 is set on the anti-tilt assembly 50, and the other is set on the frame 10.

[0123] Furthermore, the positioning pin 52 and the positioning hole 53 are inserted and fitted together to define one of the anti-tilt position and the support position.

[0124] 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.

[0125] 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.

[0126] 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.

[0127] 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.

[0128] Furthermore, the positioning pin 52 is movably mounted on the anti-tilt assembly 50 or the frame 10.

[0129] 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.

[0130] 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).

[0131] Wheelchair 100 also includes guide surface 55.

[0132] The guide surface 55 is set on the frame 10 (specifically on the rear wheel frame 14) and adjacent to the positioning hole 53.

[0133] 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.

[0134] 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.

[0135] 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.

[0136] Furthermore, the anti-tilt assembly 50 includes a support frame 511 and a support wheel 512.

[0137] 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.

[0138] 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.

[0139] 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.

[0140] In one embodiment, the support frame 511 has a baffle 5111.

[0141] 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.

[0142] 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.

[0143] In summary, the beneficial effects of this utility model include: not only by setting the first locking position (as the storage position of the assisting roller 42) and the second locking position (as the assisting position of the assisting roller 42), the assisting roller 42 can provide assistance during the transportation of the wheelchair 100. For example, when transporting it to the trunk of a car, the assisting roller 42 can be supported inside the trunk, so that the wheelchair 100 can enter the trunk more smoothly; moreover, by setting the assisting roller 42 into a structure of 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 effects of saving effort and convenience.

[0144] 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.

[0145] 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; The bracket has a first end and a second end that are arranged opposite to each other; the second end is rotatably connected to the lower front part of the frame about a power-assisted pivot, and 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 stored between the front wheel and the rear wheel, and is located above the bottom plane; When in the second locking position, the bracket drives the assist roller to extend below the bottom plane.

2. 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 pivots; The second end of the bracket is rotatably connected to the front wheel frame around the power assist shaft; The backrest frame, seat frame, front wheel frame, and rear wheel frame are linked by the four pivots to allow the frame to switch between an unfolded state and a folded state.

3. The wheelchair according to claim 2, characterized in that, The bracket also has a third locking position relative to the frame; When in the third position, 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.

4. The wheelchair according to claim 3, characterized in that, The bracket and the frame are connected by a pin mechanism to define the first locking position, the second locking position, and the third locking position.

5. The wheelchair according to claim 4, characterized in that, The pin mechanism includes: Three pin holes are formed on the front wheel bracket 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 front wheel frame.

6. The wheelchair according to claim 3, 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.

7. The wheelchair according to claim 2, 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°.

8. The wheelchair according to claim 2, characterized in that, The frame also includes armrests, the rear of which are 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, so that the armrest is stored on the side of the backrest frame.

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.

Images