Folding wheelchair
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-12
- Publication Date
- 2026-08-07
AI Technical Summary
[0016] Compared with existing technologies, the beneficial effects of this embodiment of the invention are as follows: By movably setting the anti-tilt component and having both an anti-tilt position and a support position, it not only prevents the wheelchair from tipping backward during use, increasing its safety, but also allows the anti-tilt component and rear wheels to jointly support the wheelchair when it is upright, freeing up the hands and making it easier to move and store. Furthermore, the anti-tilt position and support position can be easily changed through the cooperation of the positioning pin, positioning hole, and elastic element, making operation simple and convenient. In other words, without increasing material costs or adding extra parts, the anti-tilt component achieves the dual requirements of anti-tilt and upright storage, and is simple, efficient, and structurally simple.
Smart Images
Figure CN224598350U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medical device technology, specifically to a folding wheelchair. Background Technology
[0002] A wheelchair is a device used to help people with mobility impairments move around. It provides body support and balance, allowing users to move independently indoors or outdoors.
[0003] To prevent wheelchairs from tipping backward, existing wheelchairs typically have an anti-tipping structure behind the rear wheels. This anti-tipping structure provides rear support to the wheelchair if it tends to tip backward unexpectedly, thus preventing the wheelchair from tipping over to some extent and improving safety.
[0004] However, with increasing user demand, foldable wheelchairs have emerged on the market to facilitate wheelchair storage. The ability to store wheelchairs upright when folded has also become a user requirement. In particular, whether it's possible to redesign the existing wheelchair structure to achieve the same ease of upright storage when folded, without increasing material costs or adding extra components, has become a key challenge for designers in the industry. Utility Model Content
[0005] The purpose of this utility model is to provide a folding wheelchair that allows for convenient upright storage when folded.
[0006] To achieve the above objectives, one embodiment provides a folding wheelchair. The wheelchair includes: skeleton; The front and rear wheels are rotatably connected to the frame, respectively. An anti-roll component is rotatably connected to the frame about an anti-roll axis and has an anti-roll position and a support position; when in the anti-roll position, the anti-roll component protrudes below the rear wheel; when in the support position, the anti-roll component protrudes above the rear wheel. Positioning pins and positioning holes, one of which is located on the anti-tilt assembly, and the other is located on the frame; and, An elastic element is disposed between the anti-tilt assembly and the frame; When in one of the anti-tilt position and the support position, the positioning pin and the 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 to drive the anti-tilt assembly to rotate toward the other of the anti-tilt position and the support position.
[0007] In a preferred embodiment, the skeleton has an unfolded state and a folded state; When the anti-tilt component is in the supported position and 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.
[0008] In a preferred embodiment, the front and rear wheels define a bottom plane; When in the supported position and the anti-tilt position, the anti-tilt component is located above the bottom plane.
[0009] In a preferred embodiment, the positioning pin is movably disposed on the anti-tilt component or the frame; The wheelchair also includes a second elastic element, which is used to apply an elastic force to the positioning pin to drive the positioning pin into the positioning hole.
[0010] In a preferred embodiment, the positioning hole is provided on the frame; the positioning pin is movably disposed on the anti-tilt component and inserted into the positioning hole to prevent the anti-tilt component from rotating relative to the frame, at which time the anti-tilt component is in the anti-tilt position; The wheelchair also includes a guide surface, which is disposed on the frame and located behind the positioning hole; As the anti-tilt assembly moves from the supported position to the anti-tilt position, the guide surface abuts against and pushes the locating pin to guide the locating pin into the locating hole.
[0011] In a preferred embodiment, the anti-tilt assembly includes a support frame and a support wheel. One end of the support frame is rotatably connected to the frame about an anti-tilt pivot, and the other end of the support frame is equipped with the support wheel. The support frame has a baffle. When the anti-tilt component is in the support position, the baffle abuts against the frame to restrict the anti-tilt component from rotating away from the anti-tilt position.
[0012] In a preferred embodiment, the wheelchair further includes: Assisted rollers; The bracket has a first end and a second end that are arranged opposite to each other; the first end is rotatably connected to the assist roller, and the second end is rotatably connected to the lower front part of the frame about the assist shaft, so that the bracket has a first locking position, a second locking position and a third locking position relative to the frame; When in the first locking position, the bracket drives the assist roller to be housed between the front wheel and the rear wheel, and is located above the bottom plane defined by the front wheel and the rear wheel; When in the second and third positions, the bracket drives the assist roller to extend below the bottom plane, and the third position is located on the side of the second position away from the first position along the rotation path.
[0013] In a preferred embodiment, the wheelchair further includes: The bracket has a first end and a second end that are disposed opposite to each other; the second end is rotatably connected to the lower front part of the frame about a power-assisting shaft, so that the bracket has a first locking position and a second locking position relative to the frame; The assisting roller includes a sub-bracket and three wheels. The sub-bracket is rotatably connected to the first end of the bracket around a central axis. The three wheels are all rotatably connected to the sub-bracket and are evenly arranged circumferentially around the central axis. When in the first locking position, the bracket drives the assist roller to be housed between the front wheel and the rear wheel, and is located above the bottom plane defined by the front wheel and the rear wheel; When in the second locking position, the bracket drives the assist roller to extend below the bottom plane.
[0014] In a preferred embodiment, the frame includes a backrest frame, a seat frame, a front wheel frame, a rear wheel frame, and four pivots; The anti-roll component is rotatably connected to the rear wheel frame; 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.
[0015] 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.
[0016] Compared with existing technologies, the beneficial effects of this embodiment of the invention are as follows: By movably setting the anti-tilt component and having both an anti-tilt position and a support position, it not only prevents the wheelchair from tipping backward during use, increasing its safety, but also allows the anti-tilt component and rear wheels to jointly support the wheelchair when it is upright, freeing up the hands and making it easier to move and store. Furthermore, the anti-tilt position and support position can be easily changed through the cooperation of the positioning pin, positioning hole, and elastic element, making operation simple and convenient. In other words, without increasing material costs or adding extra parts, the anti-tilt component achieves the dual requirements of anti-tilt and upright storage, and is simple, efficient, and structurally simple. 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 power assist mechanism is in the first locking position and the anti-tilt component is in the anti-tilt position; Figure 2 Is a perspective view of a wheelchair in a folded state according to an embodiment, where the exemplary assist mechanism is in the first position and the anti-tipping component is in the support position; Figure 3 Is Figure 1 The partial enlarged view of area D in Figure 4 Is Figure 2 The partial enlarged view of area E in Figure 5 Is Figure 2 The side view of the wheelchair in [[ID=!8]] Figure 6 Is Figure 4 The partial enlarged structural decomposition view of area E in Figure 7 Is Figure 1 The side view of the wheelchair in Figure 8 Is the side view of a wheelchair according to an embodiment when it is in a state between the unfolded state and the folded state; Figure 9 Is the side view of a wheelchair according to an embodiment when it is in the folded state, where the exemplary assist mechanism is in the second position; Figure 10 Is the side view of a wheelchair according to an embodiment when it is in the folded state, where the exemplary assist mechanism is in the third position; Figure 11 Is the perspective view of a wheelchair according to an embodiment when it is in the folded state, where area C is locally enlarged. Detailed implementation manners
[0018] The following will describe the present application in detail in conjunction with the specific implementation manners shown in the drawings. However, these implementation manners are only used to illustrate the present utility model and do not limit the scope of the present application. Any structural, method, or functional transformation made by those of ordinary skill in the art according to these implementation manners is included in the protection scope of the present application.
[0019] In each drawing of the present application, for the convenience of illustration, the dimensions of some structures or parts are exaggerated relative to other structures or parts. Therefore, it is only used to illustrate the basic structure of the subject matter of the present application.
[0020] 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.
[0021] The wheelchair 100 includes a frame 10, front wheels 20, and rear wheels 30.
[0022] 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.
[0023] The number of the rear wheels 30 is set to a pair, which are respectively rotatably connected to the lower rear part of the frame 10.
[0024] When the wheelchair 100 is set as an electric wheelchair, the rear wheels 30 can be set as drive wheels.
[0025] Refer Figure 1 and Figure 2 , the frame 10 has an unfolded state and a folded state.
[0026] It can be understood that, as Figure 1 shown, in the unfolded state, the frame 10 can be used for the user to sit on; as Figure 2 shown, in the folded state, the user cannot directly sit on the frame 10.
[0027] In this application, the wheelchair 100 further includes an anti-tipping component 50.
[0028] Refer Figure 3 and Figure 4 , the anti-tipping component 50 is rotatably connected to the frame 10 around an anti-tipping rotating shaft 500, and on the rotation path, the anti-tipping component 50 has an anti-tipping position and a supporting position fixed relative to the frame 10.
[0029] Among them, in combination with Figure 1 and Figure 3 , 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.
[0030] 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.
[0031] Refer Figure 2 and Figure 4 , 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.
[0032] 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.
[0033] For example, as Figure 5 shown, taking the example line F as the support surface (such as a horizontal ground), the rear wheel 30 and the anti-tipping component 50 are used to jointly support the wheelchair 100.
[0034] And, refer Figure 6In this application, the wheelchair 100 also includes a positioning pin 52, a positioning hole 53, and an elastic element 54.
[0035] One of the positioning pins 52 and the positioning holes 53 is provided on the anti-tilt assembly 50, and the other is provided on the frame 10. The positioning pins 52 and the positioning holes 53 are inserted and engaged to define one of the anti-tilt positions and the support positions.
[0036] The elastic element 54 is disposed between the anti-rollover assembly 50 and the frame 10, and applies an elastic force to the anti-rollover assembly 50 toward the other of the anti-rollover position and the support position.
[0037] That is, when in one of the anti-tilt position and the support position, the positioning pin 52 and the positioning hole 53 are engaged to prevent the anti-tilt component 50 and the frame 10 from rotating relative to each other, and the elastic member 54 applies an elastic force to the anti-tilt component 50 to drive the anti-tilt component 50 to rotate to the other of the anti-tilt position and the support position.
[0038] By setting the elastic element 54, combined with the positioning pin 52 and the positioning hole 53, the anti-roll component 50 can be easily changed between the anti-roll position and the support position. For example, pulling the positioning pin 52 can release the anti-roll component 50, allowing the anti-roll component 50 to rotate from one of the anti-roll position and the support position to the other of the anti-roll position and the support position.
[0039] For example, in this embodiment, the positioning pin 52 and the positioning hole 53 are inserted to define the anti-tilt position; the 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 in the positioning hole 53 to prevent the anti-tilt assembly 50 from rotating relative to the frame 10; 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 elastic member 54.
[0040] Alternatively, in a variation, the positioning pin 52 and the positioning hole 53 are engaged to define a support position; the elastic element 54 applies an elastic force toward the anti-tilt assembly 50.
[0041] In summary, the wheelchair 100 of this application, through the movable anti-tilt component 50, has an anti-tilt position and a support position. This not only prevents the wheelchair 100 from tipping backward during use, increasing the safety of the wheelchair 100, but also allows the wheelchair 100 to be supported by the anti-tilt component 50 and the rear wheels 30 when the wheelchair 100 is upright, freeing up the hands and making it easier to move and store. In addition, the anti-tilt position and the support position can be changed simply and conveniently through the cooperation of the positioning pin 52, the positioning hole 53 and the elastic element 54, making operation easy.
[0042] That is, without increasing the additional material cost and without adding additional components, the anti-tipping and erection storage dual requirements are achieved through the anti-tipping component 50, and the operation is simple and efficient, and the structure is simple.
[0043] Further, referring Figure 5 , when the anti-tipping component 50 is in the supporting position, and the frame 10 is in the folded state and erected, the center of gravity of the wheelchair 100 is located between the rear wheel 30 and the anti-tipping component 50, and is supported by the rear wheel 30 and the anti-tipping component 50 together.
[0044] For example, as Figure 5 shown, taking the example line F as the horizontal ground, both the rear wheel 30 and the anti-tipping component 50 are supported on the horizontal ground F, and the center of gravity of the wheelchair 100 is between the contact point P1 of the rear wheel 30 and the contact point P2 of the anti-tipping component 50.
[0045] In one embodiment, the front wheel 20 and the rear wheel 30 can jointly define the bottom plane T of the wheelchair 100, and the bottom plane T is a virtual plane.
[0046] If the wheelchair 100 is placed on the support platform and the front wheel 20 and the rear wheel 30 jointly contact the support platform, the bottom plane T is also overlapped with the support platform.
[0047] In this application, it can be understood that taking the bottom plane T defined by the front wheel 20 and the rear wheel 30 as a reference, the front-back direction and the left-right direction are parallel to the bottom plane T; the height direction is the direction perpendicular to the bottom plane T. It should be noted that in this application, only the bottom plane T is used to define the concepts of front-back, left-right, height, up-down, etc. of the wheelchair 100.
[0048] When the anti-tipping component 50 is in the anti-tipping position, the anti-tipping component 50 is located above the bottom plane T defined by the front wheel 20 and the rear wheel 30.
[0049] When the anti-tipping component 50 is in the supporting position, the anti-tipping component 50 is still located above the bottom plane T defined by the front wheel 20 and the rear wheel 30.
[0050] In this way, when the anti-tipping component 50 rotates relative to the frame 10, it does not affect the normal movement of the wheelchair 100 all the time.
[0051] Referring Figure 6 , the positioning pin 52 is movably arranged on the anti-tipping component 50 or the frame 10. The wheelchair 100 further includes a second elastic member for applying an elastic force to the positioning pin 52 to drive the positioning pin 52 to be inserted into the positioning hole 53.
[0052] In one embodiment, the positioning pin 52 is movably arranged on the anti-tipping component 50, and the positioning hole 53 is arranged on the frame 10 (specifically, it can be the rear wheel frame 14). <>
[0053] Furthermore, the wheelchair 100 also includes a guide surface 55.
[0054] The guide surface 55 is provided on the frame 10 (specifically on the rear wheel frame 14) and is located behind the positioning hole 53.
[0055] As the anti-tilt assembly 50 moves from the supported position to the anti-tilt position, the guide surface 55 abuts against and pushes the locating pin 52 (e.g., overcoming the elastic force of the second elastic element) to guide the locating pin 52 into the locating hole 53.
[0056] For example, when the locating pin 52 moves to the locating hole 53, driven by the second elastic element, the locating pin 52 moves relative to the anti-tilt assembly 50 so that its end is inserted into the locating hole 53.
[0057] 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.
[0058] Furthermore, the anti-tilt assembly 50 includes a support frame 511 and a support wheel 512.
[0059] One end of the support frame 511 is rotatably connected to the frame 10 around the anti-tilt shaft 500, and the other end of the support frame 511 is equipped with a support wheel 512.
[0060] Correspondingly, the positioning pin 52 is movably mounted on the support frame 511, and the second elastic element is mounted between the positioning pin 52 and the support frame 511.
[0061] The elastic element 54 is disposed between the support frame 511 and the skeleton 10.
[0062] In one embodiment, the support frame 511 has a baffle 5111.
[0063] 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.
[0064] 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.
[0065] Furthermore, participants Figure 7 In one embodiment, the skeleton 10 may employ a four-bar folding mechanism.
[0066] Specifically, the frame 10 includes a backrest frame 11, a seat frame 12, a front wheel frame 13, and a rear wheel frame 14.
[0067] The seat frame 12 can be used to install a seat cushion for users to sit on.
[0068] The backrest frame 11 can be used to install a backrest for the user to lean against.
[0069] 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.
[0070] 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.
[0071] 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.
[0072] 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.
[0073] 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.
[0074] 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.
[0075] The rear of the front wheel frame 13 is rotatably connected to the backrest frame 11 via the second pivot 192.
[0076] The front part of the rear wheel frame 14 is rotatably connected to the seat frame 12 via a third pivot 193.
[0077] The rear of the seat frame 12 is rotatably connected to the backrest frame 11 via the fourth pivot 194.
[0078] Thus, when the wheelchair 100 needs to be stored, the frame 10 can be changed from an unfolded state to a folded state.
[0079] 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.
[0080] 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 7(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°.
[0081] That is, the included angle A is greater than 90° and less than or equal to 160°.
[0082] 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.
[0083] Preferably, the included angle A is 140°~160°.
[0084] More preferably, the included angle A is 150°~160°, for example 150°, 152°, 153°, 154°, 155°, 156°, 157°, 158°, 159°, 160°.
[0085] Among them, the four rotating shafts 191, 192, 193 and 194 are parallel and extend in the left and right direction.
[0086] 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.
[0087] 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.
[0088] In this way, even if the user only sits on the front half of the seat frame 12, or even the front 1 / 4 or 1 / 3 of the seat frame, the wheelchair 100 can remain stably in the unfolded state without accidentally flipping over and folding due to the user's weight. This improves the safety of use, reduces the strength requirements of the locking mechanism, and prevents the locking mechanism from jamming or being damaged.
[0089] Furthermore, participants Figure 7 The frame 10 also includes a locking mechanism 16.
[0090] The locking mechanism 16 is used to lock the frame 10 in the deployed state.
[0091] Specifically, in the unfolded state, the backrest frame 11 and the front wheel frame 13 are connected by a locking mechanism 16 to restrict their relative rotation.
[0092] For example, in the unfolded state, the locking mechanism 16 connects the lower part of the backrest frame 11 and the rear part of the front wheel frame 13 to prevent the lower part of the backrest frame 11 and the rear part of the front wheel frame 13 from moving away from each other, thereby restricting the backrest frame 11 and the front wheel frame 13 from rotating relative to each other around the second pivot 192. In this way, the frame 10 can be locked in the unfolded state.
[0093] 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.
[0094] Furthermore, the skeleton 10 also includes a second locking mechanism 17.
[0095] The second locking mechanism 17 is used to lock the frame 10 in a folded state.
[0096] 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.
[0097] 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.
[0098] Further, see Figure 8 The frame 10 also includes handrails 15.
[0099] The rear of the armrest 15 is rotatably connected to the backrest frame 11 via a fifth pivot.
[0100] 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.
[0101] 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.
[0102] 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).
[0103] The number of handrails 15 is set to two, namely, the left handrail 15 and the right handrail 15.
[0104] 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.
[0105] In another embodiment, the backrest frame 11 also includes a frame and a connecting seat 111.
[0106] The rear end of the handrail 15 is rotatably connected to the connecting seat 111 via the fifth pivot.
[0107] 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.
[0108] 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.
[0109] Furthermore, combined Figures 9 to 11 The wheelchair 100 also includes 40 assistive devices.
[0110] 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).
[0111] Specifically, the assist mechanism 40 includes an assist roller 42 and a bracket 41.
[0112] The bracket 41 has a first end and a second end.
[0113] The first end of the bracket 41 (e.g.) Figure 11 The lower end of the middle is rotatably connected to a power-assisted roller 42.
[0114] The second end of the bracket 41 (e.g.) Figure 11 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 and a second locking position relative to the frame 10.
[0115] When in the first card position, refer Figure 8 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.
[0116] 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.
[0117] When in the second card slot, refer Figure 9 The bracket 41 drives the assist roller 42 to unfold, so that the assist roller 42 extends below the bottom plane T. For example, it can be below (or below the front wheel 20).
[0118] 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.
[0119] In one embodiment, the bracket 41 also has a third locking position relative to the frame 10.
[0120] When in the third 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; 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 front wheel 20.
[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 11 The pin mechanism includes three pin holes 441, 442, and 443 and a pin 43.
[0130] The three pin hole brackets 41 are located on the frame 10 (specifically the front wheel frame 13) and are distributed circumferentially around the power steering shaft 400. The three pin holes 441, 442, and 443 correspond to the first locking position, the second locking position, and the third locking position, respectively.
[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 8 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 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 10 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 pin mechanism also includes a third elastic element.
[0138] The third elastic element is disposed between the pin 43 and the bracket 41, and applies an elastic force toward the end of the pin 43.
[0139] The pin 43 is slidably positioned relative to the bracket 41, and correspondingly, the elastic force is along the left and right direction.
[0140] 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. This process overcomes the elastic force of the third elastic element.
[0141] When the bracket 41 rotates to the desired pin hole 441, 442 or 443, the pin 43 is released. Driven by the third 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.
[0142] In one embodiment, the third elastic element is configured as a tension spring or a spring, but is not limited thereto.
[0143] Furthermore, in one embodiment, the assist roller 42 includes a bracket 422 and three wheels 421. Of course, in a variation embodiment, the assist roller 42 can be configured as a single wheel structure.
[0144] 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.
[0145] Thus, by setting it into a three-wheel 421 structure, the effort-saving effect can be further achieved.
[0146] In summary, the beneficial effects of this utility model include: by movably setting the anti-tilt component 50, which has an anti-tilt position and a support position, it can not only prevent the wheelchair 100 from tipping backward during use, increasing the safety of the wheelchair 100; but also, when the wheelchair 100 is upright, the anti-tilt component 50 and the rear wheel 30 can jointly support the wheelchair 100, freeing up the hands and making it easier to move the wheelchair 100 and store it; in addition, the anti-tilt position and the support position can be changed simply and conveniently through the cooperation of the positioning pin 52, the positioning hole 53 and the elastic element 54, making the operation easy.
[0147] In other words, without increasing the cost of additional materials or adding additional parts, the anti-tilting component 50 achieves the dual requirements of anti-tilting and vertical storage, and is easy and efficient to operate with a simple structure.
[0148] 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.
[0149] The detailed descriptions listed above are merely specific descriptions of feasible implementation methods of this utility model and are not intended to limit the scope of protection of this utility model. All equivalent implementation methods or modifications made without departing from the spirit of this utility model should be included within the scope of protection of this utility model.
Claims
1. A folding wheelchair, characterized in that, include: skeleton; The front and rear wheels are rotatably connected to the frame, respectively. An anti-roll component is rotatably connected to the frame about an anti-roll axis and has an anti-roll position and a support position that are fixed relative to the frame; when in the anti-roll position, the anti-roll component protrudes below the rear wheel; when in the support position, the anti-roll component protrudes above the rear wheel. Positioning pins and positioning holes, one of which is located on the anti-tilt assembly, and the other is located on the frame; and, An elastic element is disposed between the anti-tilt assembly and the frame; When in one of the anti-tilt position and the support position, the positioning pin and the 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 to drive the anti-tilt assembly to rotate toward the other of the anti-tilt position and the support position.
2. The folding wheelchair according to claim 1, characterized in that, The skeleton has an unfolded state and a folded state; When the anti-tilt component is in the supported position and 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.
3. The folding wheelchair according to claim 1, characterized in that, The front and rear wheels define the bottom plane; When in the supported position and the anti-tilt position, the anti-tilt component is located above the bottom plane.
4. The folding wheelchair according to claim 1, characterized in that, The positioning pin is movably mounted on the anti-tilt component or the frame; The wheelchair also includes a second elastic element, which is used to apply an elastic force to the positioning pin to drive the positioning pin into the positioning hole.
5. The folding wheelchair according to claim 1, characterized in that, The positioning hole is provided on the frame; the positioning pin is movably provided on the anti-tilt component and is inserted into the positioning hole to prevent the anti-tilt component from rotating relative to the frame, at which time the anti-tilt component is in the anti-tilt position; The wheelchair also includes a guide surface, which is disposed on the frame and located behind the positioning hole; As the anti-tilt assembly moves from the supported position to the anti-tilt position, the guide surface abuts against and pushes the locating pin to guide the locating pin into the locating hole.
6. The folding wheelchair according to claim 1, characterized in that, The anti-tilt assembly includes a support frame and a support wheel. One end of the support frame is rotatably connected to the frame around the anti-tilt pivot, and the other end of the support frame is equipped with the support wheel. The support frame has a baffle. When the anti-tilt component is in the support position, the baffle abuts against the frame to restrict the anti-tilt component from rotating away from the anti-tilt position.
7. The folding wheelchair according to claim 1, characterized in that, Also includes: Assisted rollers; The bracket has a first end and a second end that are arranged opposite to each other; the first end is rotatably connected to the assist roller, and the second end is rotatably connected to the lower front part of the frame about the assist shaft, so that the bracket has a first locking position, a second locking position and a third locking position relative to the frame; When in the first locking position, the bracket drives the assist roller to be housed between the front wheel and the rear wheel, and is located above the bottom plane defined by the front wheel and the rear wheel; When in the second and third positions, the bracket drives the assist roller to extend below the bottom plane, and the third position is located on the side of the second position away from the first position along the rotation path.
8. The folding wheelchair according to claim 1, characterized in that, Also includes: The bracket has a first end and a second end that are disposed opposite to each other; the second end is rotatably connected to the lower front part of the frame about a power-assisting shaft, so that the bracket has a first locking position and a second locking position relative to the frame; The assisting roller includes a sub-bracket and three wheels. The sub-bracket is rotatably connected to the first end of the bracket around a central axis. The three wheels are all rotatably connected to the sub-bracket and are evenly arranged circumferentially around the central axis. When in the first locking position, the bracket drives the assist roller to be housed between the front wheel and the rear wheel, and is located above the bottom plane defined by the front wheel and the rear wheel; When in the second locking position, the bracket drives the assist roller to extend below the bottom plane.
9. The folding 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 anti-roll component is rotatably connected to the rear wheel frame; 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.
10. The folding wheelchair according to claim 9, 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.