Folding wheelchair frame and electric wheelchair

Abstract

The utility model provides a kind of folding wheelchair framework and electric wheelchair.The framework includes backrest frame, seat frame, front wheel frame, rear wheel frame and first to fourth pivot;Front wheel frame and rear wheel frame are connected by first pivot and rotate in cross, the rear of front wheel frame is connected with backrest frame by second pivot and rotates, the front of rear wheel frame is connected with seat frame by third pivot and rotates, the rear of seat frame is connected with backrest frame by fourth pivot and rotates;In unfolded state, in the vertical projection plane of four pivots: second pivot is located in the front of the line of first pivot and fourth pivot;And, the line of second pivot and fourth pivot and the line of second pivot and first pivot have included angle, and included angle is obtuse angle and angle does not exceed 160 °.In this way, not only folding operation is simple and convenient, but also wheelchair can stably keep unfolded state and not easy to start folding accidentally, use more safely.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a folding wheelchair frame and an electric 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] Most existing wheelchair folding structures use linkage mechanisms, which utilize the motion relationships of linkages to achieve the unfolding and folding of the entire vehicle.

[0004] However, if the linkage mechanism is not designed properly, on the one hand, it will make the operation of unfolding and folding the wheelchair complicated; on the other hand, considering the user's mobility difficulties, when getting on or off the wheelchair, the foldable wheelchair may be accidentally opened and folded, which may cause the user to fall and cause a safety accident; furthermore, even if the foldable wheelchair has a locking structure design corresponding to the unfolded state, if the linkage mechanism is not designed properly, the locking structure may be subjected to excessive pressure and may be easily damaged or jammed. Utility Model Content

[0005] To address the problem of unreasonable linkage mechanism design, the purpose of this utility model is to provide a folding wheelchair frame and an electric wheelchair.

[0006] To achieve the above objectives, one embodiment provides a folding wheelchair frame. The frame includes a backrest frame, a seat frame, a front wheel frame connected to the front wheels, a rear wheel frame connected to the rear wheels, and four pivots. 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. The backrest frame, seat frame, front wheel frame, and rear wheel frame are linked by the four pivots to allow the frame to change between an unfolded state and a folded state. 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°.

[0007] In a preferred embodiment, the four rotating shafts extend in the left-right direction, and the included angle is 140°~160°.

[0008] In a preferred embodiment, in the unfolded state, of the four rotating shafts: The first rotating shaft has the lowest height, and the fourth rotating shaft has the highest height. And / or, the third pivot is at the front and the fourth pivot is at the back.

[0009] In a preferred embodiment, in the unfolded state, within the vertical projection plane of the four rotation axes: The front-to-back distance between the third pivot and the front end of the seat frame is less than or equal to 1 / 3 or 1 / 4 of the front-to-back distance between the fourth pivot and the front end of the seat frame.

[0010] In a preferred embodiment, the frame further includes a locking mechanism, through which the backrest frame and the front wheel frame are connected in the unfolded state to restrict relative rotation between them; The locking mechanism includes: A locking lever is fixedly installed at the lower part of the backrest frame; A locking groove is provided at the rear of the front wheel frame; in the deployed state, the locking rod is embedded in the locking groove; The unlocking component is rotatably connected to the rear of the front wheel carrier and has a locked position and an unlocked position; the unlocked position is disposed relative to the locked position along a first rotational direction. In the locked position, the unlocking member extends into the path of the locking rod entering and exiting the locking slot, and in the unfolded state, it prevents the locking rod from leaving the locking slot; When in the unlocked position, the unlocking element exits the path and allows the locking lever to leave the locking slot.

[0011] In a preferred embodiment, the locking mechanism further includes: A stop member is fixedly disposed at the rear of the front wheel frame; when the unlocking member is in the deployed state and the unlocking member is in the locked position, the stop member abuts against the unlocking member to prevent the unlocking member from rotating in the opposite direction of the first rotation direction; and when the unlocking member is in the locked position and an external force attempts to disengage the locking rod from the locking groove, the locking rod abuts against the unlocking member in the opposite direction of the first rotation direction. An elastic drive element, connected between the unlocking element and the front wheel carrier, is used to apply an elastic force to the unlocking element toward the locked position.

[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.

[0013] In a preferred embodiment, the frame further includes a booster roller and a bracket; the bracket has opposing first and second ends; The first end of the bracket is rotatably connected to the assist roller; The second end of the bracket is rotatably connected to the front part of the front wheel frame around the power assist shaft, so that the bracket has a first locking position, a second locking position and a third locking position relative to the front wheel 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.

[0014] 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.

[0015] To achieve the above objectives, one embodiment provides an electric wheelchair. The wheelchair includes the frame of any of the foregoing embodiments.

[0016] Compared with the prior art, the beneficial effects of this embodiment of the utility model are as follows: by using a four-link frame and combining the positional relationship of the second, fourth, and first rotating shafts, the wheelchair can be easily unfolded and folded, making the operation simple. Moreover, the frame is 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 (i.e., not on the back of the seat frame), the seat frame and backrest frame will not be triggered to tip forward. The wheelchair can be stably kept in the unfolded state and is less likely to start folding accidentally, making it safer to use. In addition, it also reduces the strength requirements of the locking mechanism, avoiding jamming or damage. 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 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 a wheelchair; Figure 5 This is a perspective view of the locking mechanism of a wheelchair in its unfolded state, according to one embodiment. Figure 6 yes Figure 5 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 7 This is a side view of a wheelchair in one state between an unfolded state and a folded state, according to an embodiment. Figure 8 This is a perspective view of a wheelchair in a folded state according to an embodiment; Figure 9 yes Figure 8 A magnified view of a portion of region C in the middle; Figure 10 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 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 third locking position; Figure 12 yes Figure 1 A magnified view of a portion of region D in the middle; Figure 13 yes Figure 3 A magnified view of a portion of region E in the middle. Detailed Implementation

[0018] The present application will now be described in detail with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments are only for illustrating the present invention and do not limit the scope of the present application. Any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the protection scope of the present application.

[0019] In the various figures of this application, for ease of illustration, certain dimensions of structures or parts may be exaggerated relative to other structures or parts; therefore, they are only used to illustrate the basic structure of the subject matter of this application.

[0020] Spatial relative position terms used herein, such as "upper", "above", "lower", "below", etc., are for the purpose of facilitating description to describe the relationship of one unit or feature relative to another unit or feature as shown in the accompanying drawings. Spatial relative position terms may 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 "above" other units or features. Thus, 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 may 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] [[ID=]] 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.

[0025] When the wheelchair 100 is set as an electric wheelchair, the rear wheels 30 can be set as drive wheels.

[0026] Refer 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.

[0027] In one embodiment, the frame 10 can adopt a four-bar folding mechanism.

[0028] Specifically, the frame 10 includes a backrest frame 11, a seat frame 12, a front wheel frame 13, and a rear wheel frame 14.

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

[0030] The backrest frame 11 can be used to install a back cushion 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 a front rotation 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 axle.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] The rear of the front wheel frame 13 is rotatably connected to the backrest frame 11 via the second pivot 192.

[0038] The front part of the rear wheel frame 14 is rotatably connected to the seat frame 12 via a third pivot 193.

[0039] The rear of the seat frame 12 is rotatably connected to the backrest frame 11 via the fourth pivot 194.

[0040] Thus, when the wheelchair 100 needs to be stored, the frame 10 can be changed from an unfolded state to a folded state.

[0041] 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.

[0042] 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°.

[0043] That is, the included angle A is greater than 90° and less than or equal to 160°.

[0044] 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 strength requirements of the locking mechanism and avoids the locking mechanism from jamming or being damaged.

[0045] Preferably, the included angle A is 140°~160°.

[0046] More preferably, the included angle A is 150°~160°, for example 150°, 152°, 153°, 154°, 155°, 156°, 157°, 158°, 159°, 160°.

[0047] Among them, the four rotating shafts 191, 192, 193 and 194 are parallel and extend in the left and right direction.

[0048] In one embodiment, when in the unfolded state, among the four rotating shafts 191, 192, 193, and 194, the first rotating shaft 191 has the lowest height, and the fourth rotating shaft 194 has the highest height.

[0049] In one embodiment, when in the unfolded state, among the four rotating shafts 191, 192, 193, and 194, the third rotating shaft 193 is the furthest forward and the fourth rotating shaft 194 is the furthest backward.

[0050] Furthermore, in the unfolded state, within the vertical projection plane of the four rotating axes 191, 192, 193, and 194: the front-to-back distance (i.e., the distance along the front-to-back direction) from the third rotating axis 193 to 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 from the fourth rotating axis 194 to the front end point 120 of the seat frame 12.

[0051] 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.

[0052] 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.

[0053] Furthermore, participants Figure 1 and Figure 2 The frame 10 also includes a locking mechanism 16.

[0054] The locking mechanism 16 is used to lock the frame 10 in the deployed state.

[0055] 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.

[0056] 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.

[0057] In one embodiment, the reference Figure 5 and Figure 6 The locking mechanism 16 includes a locking lever 161, a locking groove 162, and an unlocking element 163.

[0058] The locking lever 161 is fixedly installed at the lower part of the backrest frame 11.

[0059] The locking slot 162 is located at the rear of the front wheel frame 13.

[0060] When in the unfolded state, the locking lever 161 is embedded in the locking groove 162.

[0061] 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.

[0062] For example, the locking lever 161 moves upward, thereby disengaging from the locking slot 162.

[0063] 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.

[0064] The unlocking component 163 has a locked position and an unlocked position.

[0065] The unlock position is set relative to the locked position along the first rotation direction.

[0066] 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.

[0067] by Figure 6 From the perspective of angle, the first direction of rotation is counterclockwise.

[0068] 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.

[0069] 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.

[0070] When unlocking the location, such as Figure 6 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.

[0071] 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.

[0072] In one embodiment, the locking mechanism 16 further includes a stop 165.

[0073] The stop 165 is fixedly installed at the rear of the front wheel frame 13.

[0074] 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.

[0075] 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.

[0076] by Figure 6 From an angle perspective, the opposite direction of the first rotation direction is the clockwise direction.

[0077] 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.

[0078] 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.

[0079] In one embodiment, the stop 165 is a cylindrical protrusion disposed on the front wheel frame 13. However, this application is not limited thereto.

[0080] In one embodiment, the unlocking member 163 includes a lever 1631 and an unlocking block 1632.

[0081] 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.

[0082] 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.

[0083] 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 6 As shown by the dashed line, this allows the locking lever 161 to move in and out of the locking slot 162.

[0084] In one embodiment, the locking mechanism 16 further includes an elastic drive element 164.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] Furthermore, the skeleton 10 also includes a second locking mechanism.

[0089] The second locking mechanism is used to lock the skeleton 10 in a folded state.

[0090] 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.

[0091] 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.

[0092] In one embodiment, the reference Figure 1 and Figure 2 The second locking mechanism includes a hook 171 and a resilient locking element 173 (reference numerals). Figure 8 ).

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] 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.

[0098] In one embodiment, the elastic locking member 173 is configured as a spring or a compression spring, but this application is not limited thereto.

[0099] Further, see Figure 7 The frame 10 also includes handrails 15.

[0100] The rear of the armrest 15 is rotatably connected to the backrest frame 11 via a fifth pivot.

[0101] In one embodiment, during the process of changing from an unfolded state to a folded state, such as Figure 7 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.

[0102] 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.

[0103] 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.

[0104] The number of handrails 15 is set to two, namely, the left handrail 15 and the right handrail 15.

[0105] 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.

[0106] In another embodiment, the backrest frame 11 also includes a frame and a connecting seat 111.

[0107] The rear end of the handrail 15 is rotatably connected to the connecting seat 111 via the fifth pivot.

[0108] 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.

[0109] The sliding connection structure and self-locking method between the connecting seat 111 and the frame can be implemented in any feasible way in the art, and will not be described in detail here.

[0110] Furthermore, combined Figure 8 The wheelchair 100 also includes 40 assistive devices.

[0111] The assistive mechanism 40 is used to provide assistance when moving the wheelchair 100 to a higher place (such as the trunk of a car).

[0112] Specifically, the assist mechanism 40 includes an assist roller 42 and a bracket 41.

[0113] The bracket 41 has a first end and a second end.

[0114] The first end of the bracket 41 (e.g.) Figure 9 The lower end of the middle is rotatably connected to a power-assisted roller 42.

[0115] The second end of the bracket 41 (e.g.) Figure 9 The 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, a second locking position and a third locking position fixedly connected to the frame 10.

[0116] When in the first card position, refer Figure 4 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 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 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.

[0118] When in the second card slot, refer Figure 10 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.

[0119] 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.

[0120] When in the third card slot, refer Figure 11 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.

[0121] 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.

[0122] For example, when in the third position, the assist roller 42 extends to the lower front of the assist shaft 400.

[0123] 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.

[0124] 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.

[0125] 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.

[0126] 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°.

[0127] The second rotation angle is greater than the first rotation angle.

[0128] 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.

[0129] Specifically, refer to Figure 9 The pin mechanism includes three pin holes 441, 442, and 443 and a pin 43.

[0130] Three pin holes are opened on the frame 10 (specifically the front wheel frame 13) and 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.

[0131] 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).

[0132] 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.

[0133] When pin 43 is inserted into another pin hole 442, as Figure 9 and Figure 10 As shown, bracket 41 is located in the second locking position.

[0134] When pin 43 is inserted into the remaining pin hole 443, as Figure 11 As shown, bracket 41 is located in the third locking position.

[0135] 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.

[0136] 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.

[0137] 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.

[0138] 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.

[0139] Thus, by setting it into a three-wheel 421 structure, the effort-saving effect can be further achieved.

[0140] Furthermore, participants Figure 12 The wheelchair 100 also includes an anti-tipping component 50.

[0141] The anti-roll component 50 is rotatably connected to the frame 10 about the anti-roll pivot 500, so that the anti-roll component 50 has an anti-roll position and a support position relative to the frame 10.

[0142] Among them, participants Figure 12 When the anti-roll component 50 is in the anti-roll position, the anti-roll component 50 protrudes below the rear wheel 30 and is located above the bottom plane T defined by the front wheel 20 and the rear wheel 30.

[0143] 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.

[0144] Refer Figure 13 , 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 defined by the front wheel 20 and the rear wheel 30.

[0145] 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 easier to carry.

[0146] In one embodiment, the wheelchair 100 further includes a positioning pin 52, a positioning hole 53 and a second elastic member.

[0147] 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.

[0148] 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.

[0149] The second elastic member is disposed between the anti-tipping component 50 and the frame 10, and applies an elastic force to the anti-tipping component 50 toward the other of the anti-tipping position and the supporting position.

[0150] That is, by setting the second elastic member and combining the settings 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.

[0151] For example, in one embodiment, the positioning pin 52 and the positioning hole 53 are inserted and matched to define the anti-tipping position; the second elastic member applies an elastic force to the anti-tipping component 50 toward 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.

[0152] 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 applies an elastic force toward the anti-tilt position to the anti-tilt assembly 50.

[0153] Furthermore, the positioning pin 52 is movably mounted on the anti-tilt assembly 50 or the frame 10.

[0154] 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.

[0155] 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.

[0156] 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).

[0157] 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.

[0158] Furthermore, the anti-tilt assembly 50 includes a support frame 511 and a support wheel 512.

[0159] 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.

[0160] 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.

[0161] The second elastic element is disposed between the support frame 511 and the frame 10, specifically between the support frame 511 and the rear wheel frame 14.

[0162] In one embodiment, the support frame 511 has a baffle 5111.

[0163] 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.

[0164] 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.

[0165] In summary, the beneficial effects of this utility model include: by using the four-link frame 10 and combining the positional relationship of the second pivot 192, the fourth pivot 194, and the first pivot 191, the wheelchair 100 can be easily unfolded and folded, making the operation simple; moreover, the frame 10 is 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 maintained in the unfolded state and is less likely to start folding accidentally; in addition, it also reduces the strength requirements of the locking mechanism and avoids the locking mechanism from jamming or being damaged.

[0166] 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.

[0167] 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 frame, characterized in that, It includes a backrest frame, a seat frame, a front wheel frame connected to the front wheels, a rear wheel frame connected to the rear wheels, and four pivots; 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. The backrest frame, seat frame, front wheel frame, and rear wheel frame are linked by the four pivots to allow the frame to change between an unfolded state and a folded state. 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°.

2. The folding wheelchair frame according to claim 1, characterized in that, The four rotating shafts extend in the left-right direction, and the included angle is 140°~160°.

3. The folding wheelchair frame according to claim 1, characterized in that, In the unfolded state, of the four rotating axes: The first rotating shaft has the lowest height, and the fourth rotating shaft has the highest height. And / or, the third pivot is at the front and the fourth pivot is at the back.

4. The folding wheelchair frame according to claim 1, characterized in that, In the unfolded state, within the vertical projection plane of the four rotation axes: The front-to-back distance between the third pivot and the front end of the seat frame is less than or equal to 1 / 3 or 1 / 4 of the front-to-back distance between the fourth pivot and the front end of the seat frame.

5. The folding wheelchair frame according to claim 1, characterized in that, It also includes a locking mechanism, in which the backrest frame and the front wheel frame are connected in the unfolded state to restrict relative rotation between them; The locking mechanism includes: A locking lever is fixedly installed at the lower part of the backrest frame; A locking groove is provided at the rear of the front wheel frame; in the deployed state, the locking rod is embedded in the locking groove; The unlocking component is rotatably connected to the rear of the front wheel carrier and has a locked position and an unlocked position; the unlocked position is disposed relative to the locked position along a first rotational direction. In the locked position, the unlocking member extends into the path of the locking rod entering and exiting the locking slot, and in the unfolded state, it prevents the locking rod from leaving the locking slot; When in the unlocked position, the unlocking element exits the path and allows the locking lever to leave the locking slot.

6. The folding wheelchair frame according to claim 5, characterized in that, The locking mechanism also includes: A stop member is fixedly disposed at the rear of the front wheel frame; when the unlocking member is in the deployed state and the unlocking member is in the locked position, the stop member abuts against the unlocking member to prevent the unlocking member from rotating in the opposite direction of the first rotation direction; and when the unlocking member is in the locked position and an external force attempts to disengage the locking rod from the locking groove, the locking rod abuts against the unlocking member in the opposite direction of the first rotation direction. An elastic drive element, connected between the unlocking element and the front wheel carrier, is used to apply an elastic force to the unlocking element toward the locked position.

7. The folding wheelchair frame according to claim 1, characterized in that, It 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.

8. The folding wheelchair frame according to claim 1, characterized in that, The frame also includes a booster roller and a bracket; the bracket has a first end and a second end opposite to each other. The first end of the bracket is rotatably connected to the assist roller; The second end of the bracket is rotatably connected to the front of the front wheel frame around the power assist shaft, and has a first locking position, a second locking position and a third locking position that are fixed relative to the front wheel 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 frame according to claim 8, 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.

10. An electric wheelchair, characterized in that, The wheelchair includes the folding wheelchair frame as described in any one of claims 1 to 9.

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