Wheelchair chassis and wheelchair

Abstract

The utility model provides a wheelchair chassis and a wheelchair, the wheelchair chassis comprises a chassis connecting part, the chassis connecting part is used for being detachably connected with a seat, so that the wheelchair chassis and the seat have a connected state and a separated state, and when the wheelchair chassis and the seat are in the separated state, the wheelchair chassis has a relatively unfolded state and a folded state. The wheelchair chassis is detachably connected with the seat, and the wheelchair chassis can be independently folded after being detached, so that the size of the wheelchair after being folded is reduced; and the detachable connection mode is also convenient for the user to replace different seats according to needs.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a wheelchair chassis and a wheelchair. Background Art

[0002] Wheelchairs are important means of transportation for special populations (such as the injured, sick, and disabled) for home rehabilitation, transportation, medical treatment, and outings. Wheelchairs not only meet their mobility needs, enabling them to exercise and participate in social activities, but also facilitate family members' mobility and care for them.

[0003] Wheelchairs provide convenience for users, but they take up a lot of space when stored. To solve the above problem, a related art solution provides a foldable wheelchair. When folded, the wheelchair's volume is reduced, thereby solving the problem of large storage space and making it easier for users to carry and transport the wheelchair.

[0004] However, the wheelchair chassis and the seat of the wheelchair in the related art are usually integrated, so that the size of the wheelchair is still relatively large after folding. Utility Model Content

[0005] In order to overcome the above-mentioned defects in the relevant technology, the purpose of the present application is to provide a wheelchair chassis and a wheelchair. The wheelchair chassis of the present application can be detachably connected to the seat. After the wheelchair chassis is disassembled, it can be folded separately, which is conducive to reducing the size of the wheelchair after folding; the detachable connection method also makes it convenient for users to replace different seats according to their needs.

[0006] On the one hand, the present application provides a wheelchair frame, including a frame connecting portion, which is used to be detachably connected to a seat so that the wheelchair frame and the seat have a connected state and a separated state, and when the wheelchair frame and the seat are in the separated state, the wheelchair frame has a relative unfolded state and a folded state.

[0007] In a possible implementation, the wheelchair chassis includes a front support, an upper support frame, and a rear support, wherein a first end of the upper support frame is hingedly connected to a first end of the rear support, and a second end of the upper support frame is hingedly connected to a first end of the front support;

[0008] When the wheelchair chassis is converted from the unfolded state to the folded state, the upper support frame is folded toward the rear support around the hinge point between the upper support frame and the rear support; the front support frame is folded toward the rear support around the hinge point between the upper support frame and the front support.

[0009] In one possible implementation, the width of the first end of the front bracket is smaller than the width of other parts on the front bracket, the width of the second end of the upper support frame is smaller than the width of other parts on the upper support frame, and the sum of the widths of the second end of the upper support frame and the first end of the front bracket is equal to the width of other parts on the upper support frame, or equal to the width of other parts on the front bracket.

[0010] In a possible implementation, the rear bracket includes a rear bracket body and a rear bracket connecting section, and the rear bracket connecting section is arranged on a side of the rear bracket body close to the first end of the rear bracket; the front bracket includes a front bracket body and a front bracket connecting section, and the front bracket connecting section is arranged on a side of the front bracket body close to the first end of the front bracket; the wheelchair chassis also includes a front connecting rod, the first end of the upper supporting frame is hingedly connected to the first end of the rear bracket body, the second end of the upper supporting frame is hingedly connected to the first end of the front bracket body, the first end of the front connecting rod is hingedly connected to the rear bracket connecting section, and the second end of the front connecting rod is hingedly connected to the front bracket body;

[0011] When the wheelchair chassis is converted from the unfolded state to the folded state, the upper support frame is folded toward the rear frame around the hinge point between the upper support frame and the rear frame body; the front connecting rod is folded toward the rear frame around the hinge point between the front connecting rod and the rear frame connecting section; the front frame is folded toward the rear frame around the hinge point between the upper support frame and the front frame body and the hinge point between the front connecting rod and the front frame connecting section.

[0012] In one possible implementation, when the wheelchair chassis is in the unfolded state, the angle between the line connecting the hinge point of the front link and the rear bracket connecting section and the hinge point of the upper support frame and the rear bracket body and the line connecting the hinge point of the front link and the rear bracket connecting section and the hinge point of the front link and the front bracket body is greater than 90°.

[0013] In a possible implementation, the base frame connection portion is provided on the upper support frame, and the base frame connection portion includes a limiting hole and a fixing pin, the limiting hole is used to be plugged into the limiting pin on the seat, and the fixing pin is used to be engaged with or separated from the fixing hook on the seat.

[0014] In one possible implementation, the wheelchair chassis includes two opposing upper support frames, the chassis connecting portion is arranged between the two upper support frames, the chassis connecting portion includes a chassis connecting plate, the end of the chassis connecting plate is provided with a connecting groove, a first fixing member is provided in the connecting groove, and the first fixing member is used to engage or separate with a first hook on the seat.

[0015] In a possible implementation, a locking mechanism is further included, which is used to lock the upper support frame and the front bracket when the wheelchair chassis is in the unfolded state, and to unlock the locked state of the upper support frame and the front bracket when the wheelchair chassis is converted from the unfolded state to the folded state.

[0016] In a possible implementation, the locking mechanism includes an unlocking pull rod, an unlocking tension spring, and a locking pin, the unlocking pull rod being hingedly connected to the upper support frame via an unlocking adapter plate, the locking pin being provided on the front bracket body, the unlocking adapter plate being provided with a chassis locking groove on a side facing the front bracket body, the first end of the unlocking tension spring being fixedly connected to the upper support frame, the second end of the unlocking tension spring being fixedly connected to the unlocking pull rod, and the unlocking tension spring being in a stretched state;

[0017] When the wheelchair chassis is in the unfolded state, the locking pin is locked in the chassis locking groove;

[0018] When the wheelchair chassis is converted from the unfolded state to the folded state, the unlocking rod moves to disengage the locking pin from the chassis locking groove.

[0019] In one possible implementation, an anti-roll wheel assembly is further included, wherein the anti-roll wheel assembly includes an anti-roll wheel and a linkage mechanism, wherein the anti-roll wheel is rotatably mounted on the wheelchair frame, and the linkage mechanism is located inside the wheelchair frame; when the wheelchair frame is in the unfolded state, the linkage mechanism drives the anti-roll wheel away from the ground; when the wheelchair frame is in the folded state, the linkage mechanism drives the anti-roll wheel to abut against the ground.

[0020] In a possible implementation, the linkage mechanism includes an unlocking link and a locking hook, wherein the first end of the unlocking link abuts against the first end of the upper support frame, the second end of the unlocking link is connected to the first end of the locking hook, and the second end of the locking hook is used to connect to or separate from the anti-rollover wheel;

[0021] When the wheelchair chassis is converted from the unfolded state to the folded state, the first end of the upper support frame rotates around the hinge point between the upper support frame and the rear bracket, and drives the unlocking link to move, and the unlocking link drives the locking hook to separate from the anti-roll wheel, so that the anti-roll wheel abuts against the ground.

[0022] In a possible implementation, a cam is provided at the first end of the upper support frame, and the first end of the unlocking link abuts against a surface of the cam.

[0023] On the other hand, the present application provides a wheelchair comprising a seat and a wheelchair chassis as described above, wherein the wheelchair chassis is detachably connected to the seat.

[0024] The present application provides a wheelchair chassis and a wheelchair. The wheelchair chassis includes a chassis connection portion, which is configured to be detachably connected to a seat, so that the wheelchair chassis and the seat can have a connected state and a detached state. When the wheelchair chassis and the seat are in the detached state, the wheelchair chassis has a relatively unfolded state and a folded state. The wheelchair chassis of the present application is detachably connected to the seat, and the wheelchair chassis can be folded separately after being detached, thereby reducing the size of the wheelchair after folding. The detachable connection also makes it easy for users to replace different seats as needed. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following is a brief introduction to the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0026] Figure 1 A simplified structural diagram of a wheelchair provided in an embodiment of the present application in a first state;

[0027] Figure 2 A simplified structural diagram of a wheelchair provided in an embodiment of the present application in a second state;

[0028] Figure 3 A simplified structural diagram of a wheelchair in a third state provided by an embodiment of the present application;

[0029] Figure 4 A simplified structural diagram of a wheelchair in a fourth state provided by an embodiment of the present application;

[0030] Figure 5 A simplified structural diagram of a wheelchair in a fifth state provided by an embodiment of the present application;

[0031] Figure 6 A partial cross-sectional view of a wheelchair in a fourth state provided by an embodiment of the present application;

[0032] Figure 7 A simplified structural diagram of a wheelchair in a second state provided by another embodiment of the present application;

[0033] Figure 8 A simplified structural diagram of a wheelchair chassis provided in another embodiment of the present application;

[0034] Figure 9 A simplified structural diagram of a chair seat provided in another embodiment of the present application at one viewing angle;

[0035] Figure 10A schematic diagram of the connection structure between the seat and the wheelchair chassis provided in another embodiment of the present application;

[0036] Figure 11 A simplified structural diagram of a wheelchair chassis in an unfolded state provided by an embodiment of the present application;

[0037] Figure 12 for Figure 11 The main view;

[0038] Figure 13 A simplified structural diagram of a wheelchair chassis in a folded state provided in one embodiment of the present application;

[0039] Figure 14 A partial exploded view of a wheelchair chassis provided in accordance with an embodiment of the present application;

[0040] Figure 15 A partial exploded view of a wheelchair in a first state provided by an embodiment of the present application;

[0041] Figure 16 A partial cross-sectional view of a wheelchair provided in a first state according to an embodiment of the present application.

[0042] Reference numerals:

[0043] 100 - Wheelchair chassis; 101 - Front wheel; 102 - Rear wheel; 110 - Front bracket; 111 - Front bracket body; 112 - Front bracket connecting section; 120 - Upper support frame; 130 - Rear bracket; 131 - Rear bracket body; 132 - Rear bracket connecting section; 133 - Anti-roll wheel mounting bracket; 141 - Limiting hole; 142 - Fixing pin; 150 - Front connecting rod; 161 - Unlocking lever; 162 - Unlocking spring; 163 - Locking pin; 164 - Unlocking adapter plate; 1641 - Chassis locking groove; 170 - Chassis connecting plate; 171 - Connecting groove; 172 - First fixing member; 173 - Second fixing member; 180 - Second connector;

[0044] 200 - seat; 210 - seat; 220 - backrest; 231 - limit latch; 232 - fixed hook; 233 - hook control lever; 234 - hook reset member; 240 - mounting base; 250 - armrest; 261 - unlocking handle; 262 - unlocking lever; 263 - first hook; 264 - second hook; 265 - hook linkage lever; 266 - unlocking handle mounting base; 270 - hook mounting base; 271 - first guide slot; 272 - second guide slot; 280 - adapter plate; 281 - first connector;

[0045] 310-anti-roll wheel; 320-unlocking connecting rod; 330-locking hook; 340-cam; 350-anti-roll wheel connecting rod; 351-anti-roll wheel locking groove; 360-connecting rod reset spring; 370-anti-roll wheel reset part. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0047] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0048] The contents of the embodiments of the present application will be described in detail below with reference to the accompanying drawings so that those skilled in the art can understand the contents of the present application in more detail.

[0049] Please refer to Figure 1-Figure 5 This embodiment provides a wheelchair, which can be an electric wheelchair (i.e., a wheelchair driven by a motor, battery, or other components) or a non-electric wheelchair (i.e., a wheelchair driven by human power). It includes a wheelchair chassis 100 and a seat 200. The wheelchair chassis 100 is connected to a front wheel 101 and a rear wheel 102, thereby facilitating the movement of the wheelchair. The wheelchair chassis 100 and the seat 200 have a relatively connected state and a separated state. When the wheelchair chassis 100 and the seat 200 are in the connected state (see Figure 1 As shown), the wheelchair can be folded as a whole (see Figure 3 Alternatively, the seats 200 may be folded individually (see Figure 4 When the wheelchair chassis 100 and the seat 200 are in a separated state (see Figure 2 As shown in FIG, the wheelchair chassis 100 and the seat 200 can be folded separately.

[0050] Specifically, when the wheelchair chassis 100 and the seat 200 are in a connected state, the wheelchair can be Figure 1 The expanded state shown folds into Figure 3 The wheelchair is in the folded state shown, making it easy to store, accommodate and transport the wheelchair.

[0051] When the wheelchair chassis 100 and the seat 200 are in a connected state, the wheelchair can also Figure 1 The expanded state shown folds into Figure 4 The semi-folded state shown, that is, only the upper seat 200 is partially folded. After the seat 200 is folded, a platform can be formed, so that the wheelchair can be used to carry items, etc., thereby improving the functionality of the wheelchair.

[0052] When the wheelchair chassis 100 and the seat 200 are in a separated state, the wheelchair can also be Figure 2 The state shown is folded into Figure 5 The state shown is that the wheelchair chassis 100 and the seat 200 are folded separately. Figure 3 In the state shown, the two can be disassembled and folded separately, further reducing their folded dimensions and making them easier for the user to store separately. A separate wheelchair chassis 100 or seat 200 is also lighter, making it easier to transport. Furthermore, the detachable connection between the wheelchair chassis 100 and seat 200 makes it easy for the user to replace a different seat or wheelchair chassis as needed, allowing the wheelchair to be expanded into a variety of different configurations to achieve different functions.

[0053] From the above description, it can be seen that the wheelchair frame 100 and the seat 200 of this embodiment are detachably connected, so that the two can be disassembled and folded separately to reduce the size of the wheelchair after folding; or, they can be folded as a whole to shorten the folding time; or, only the seat 200 can be folded to meet the different needs of users.

[0054] The wheelchair chassis 100 and seat 200 of this embodiment can be quickly disassembled and connected via a quick-release mechanism. Once disassembled, each part is lightweight (e.g., less than 13 kg), making it easier for the user to carry. Disassembly also allows for a variety of different usage scenarios. For example, components such as batteries and motors can be integrated into the wheelchair chassis 100, transforming it into a powered chassis. This can then be connected to other devices (such as a baby stroller seat, camper seat, pet stroller seat, or robot arm) through corresponding interfaces, allowing for expansion into various usage scenarios, such as baby strollers, camper seats, pet strollers, and robots.

[0055] The quick-release structure includes a seat connection portion and a chassis connection portion. For example, the seat connection portion is provided on the side of the seat 200 of this embodiment that faces the wheelchair chassis 100. The chassis connection portion is also provided on the side of the wheelchair chassis 100 that faces the seat 200. The chassis connection portion is detachably connected to the seat connection portion, thereby enabling the wheelchair chassis 100 and seat 200 to be connected or disconnected.

[0056] Specifically, if Figure 2 、 Figures 6-10 As shown, the chair 200 of this embodiment includes a seat 210 and a backrest 220 . The seat 210 and the backrest 220 are hinged to each other, and a seat connection portion is provided on a side of the seat 210 facing away from the backrest 220 .

[0057] The wheelchair chassis 100 includes a front bracket 110, an upper support frame 120 and a rear bracket 130. The first end of the upper support frame 120 is hingedly connected to the first end of the rear bracket 130, and the second end of the upper support frame 120 is hingedly connected to the first end of the front bracket 110. The chassis connection part is set on the upper support frame 120.

[0058] like Figure 2 and Figure 6 As shown, in one possible embodiment, the seat connection portion of this embodiment includes a limit pin 231, a fixed hook 232 and a hook control rod 233, and the hook control rod 233 is connected to the first end of the fixed hook 232, so that the fixed hook 232 can be driven to move by the hook control rod 233.

[0059] See also Figure 2 and Figure 6 As shown, the chassis connection portion includes a limiting hole 141 and a fixing pin 142. The limiting hole 141 is located on the side of the upper support frame 120 facing the seat 200, and the fixing pin 142 is located on the inner side of the upper support frame 120. When the wheelchair chassis 100 and the seat 200 are connected as one, the limiting pin 231 is inserted into the limiting hole 141, thereby achieving relative positioning of the wheelchair chassis 100 and the seat 200. The second end of the fixing hook 232 is engaged with the fixing pin 142, thereby fixing the wheelchair chassis 100 and the seat 200 as one.

[0060] Further, see Figure 6 As shown, in this embodiment, a mounting base 240 is provided on the side of the seat 210 facing away from the backrest 220. The middle portion of a fixed hook 232 is hingedly connected to the mounting base 240, and a hook control rod 233 is hingedly connected to the first end of the fixed hook 232. The free end of the hook control rod 233 can be positioned below the backrest 220. By pressing the hook control rod 233 downward, the fixed hook 232 is rotated upward, thereby separating the fixed hook 232 from the fixing pin 142, thereby unlocking the seat 200.

[0061] Further, see Figure 6 As shown, in this embodiment, a hook reset member 234 is further provided between the fixed hook 232 and the mounting seat 240. The hook reset member 234 includes a hook reset torsion spring, which is mounted on the hinge axis between the fixed hook 232 and the mounting seat 240. When the fixed hook 232 rotates upward, it compresses the hook reset member 234. When the external force applied to the free end of the hook control rod 233 is removed, the elastic restoring force of the hook reset member 234 can re-engage the fixed hook 232 with the fixing pin 142, thereby locking the seat 200.

[0062] In this embodiment, two limit latches 231, two fixed hooks 232, two limit holes 141, and two fixed pins 142 are provided, one on each side of the wheelchair widthwise, to enhance stability when the wheelchair frame 100 and seat 200 are connected. The two fixed hooks 232 can be connected to the same hook control lever 233, which can be used to simultaneously control the unlocking or relative locking of the fixed hooks 232 and the fixed pin 142 on both sides.

[0063] like Figure 7-10As shown, in another possible embodiment, the seat connection portion of this embodiment includes an unlocking handle 261, an unlocking rod 262, and a first hook 263. The unlocking handle 261 is connected to the unlocking rod 262, and the end of the unlocking rod 262 is connected to the first end of the first hook 263. Pulling the unlocking handle 261 drives the unlocking rod 262 to move, thereby driving the first hook 263 to move. The wheelchair chassis includes two opposing upper support frames 120, and the chassis connection portion is disposed between the two upper support frames 120. The chassis connection portion includes a chassis connecting plate 170, and the end of the chassis connecting plate 170 is provided with a connecting groove 171. The connecting groove 171 contains a first fixing member 172. Exemplarily, the first fixing member 172 can be a fixing pin, a fixing shaft, or other structure. When the wheelchair chassis and seat are connected as one, the second end of the first hook 263 is engaged with the first fixing member 172, thereby fixing the wheelchair chassis 100 to the seat 200.

[0064] Furthermore, if Figure 9 As shown, in this embodiment, a hook mounting base 270 is provided on the side of the seat 210 facing away from the backrest 220. The middle portion of a first hook 263 is hingedly connected to the hook mounting base 270, and an unlocking lever 262 is hingedly connected to the first end of the first hook 263. When the unlocking handle 261 is pulled, the unlocking handle 261 drives the unlocking lever 262 to move along the length of the wheelchair (e.g., the forward or backward direction of the wheelchair). The unlocking lever 262 then drives the first hook 263 to rotate about the hinge point, causing the second end of the first hook 263 to rotate upward, thereby separating the first hook 263 from the first fixing member 172, thereby unlocking the seat 200.

[0065] Please continue to refer to Figure 9 To enhance the locking stability between the wheelchair base 100 and the seat 200, the seat connection portion of this embodiment further includes a second hook 264 and a hook linkage rod 265. The first end of the second hook 264 is hingedly connected to the hook mounting seat 270, the first end of the hook linkage rod 265 is hingedly connected to the first end of the first hook 263, and the second end of the hook linkage rod 265 is hingedly connected to the middle portion of the second hook 264. Accordingly, a second fixing member 173 is also provided within the connecting groove 171. When the wheelchair base 100 and the seat 200 are connected, the second end of the second hook 264 is locked to the second fixing member 173. Thus, the wheelchair base 100 and the seat 200 are fixed together by utilizing the locking structure between the first hook 263 and the first fixing member 172, and the locking structure between the second hook 264 and the second fixing member 173.

[0066] It is understood that due to the presence of the hook linkage rod 265, when the unlocking handle 261 is pulled, the unlocking handle 261 drives the unlocking rod 262 to move along the length of the wheelchair, and the unlocking rod 262 drives the first hook 263 to rotate about the hinge point, causing the second end of the first hook 263 to rotate upward, thereby separating the first hook 263 from the first fixing member 172. As the first hook 263 rotates, it can also drive the hook linkage rod 265 to rotate, causing the hook linkage rod 265 to pull the middle portion of the second hook 264 to rotate upward, thereby separating the second hook 264 from the second fixing member 173, thereby unlocking the seat 200.

[0067] To better secure the first hook 263 and the first fixing member 172, and the second hook 264 and the second fixing member 173, the hook mounting base 270 of this embodiment is further provided with a first guide groove 271 and a second guide groove 272. The first guide groove 271 and the second guide groove 272 have similar structures, with their dimensions gradually decreasing from the opening to the bottom. This serves to guide the first fixing member 172 and the second fixing member 173 when the seat 200 is mounted on the wheelchair chassis 100. The first guide groove 271 corresponds to the first hook 263, and the second guide groove 272 corresponds to the second hook 264. When the wheelchair chassis 100 and the seat 200 are connected, the first fixing member 172 is located within the first guide groove 271, and the second fixing member 173 is located within the second guide groove 272, thereby ensuring smooth securement of the first hook 263 and the second hook 264.

[0068] like Figure 10 As shown, in one possible implementation, the unlocking lever 262 is further connected to a hook reset spring (not shown in the figure). The seat 200 also includes an adapter plate 280, which is provided with a spring fixing post (not shown in the figure). The first end of the hook reset spring is connected to the unlocking lever 262, and the second end of the hook reset spring is connected to the spring fixing post. When the unlocking handle 261 is pulled, the hook reset spring can be stretched, causing the hook reset spring to produce a certain elastic deformation. When the external force applied to the unlocking handle 261 is removed, the elastic restoring force of the hook reset spring can re-engage the first hook 263 and the first fixing member 172, and re-engage the second hook 264 and the second fixing member 173, thereby locking the seat 200.

[0069] In this embodiment, each end of the unlocking lever 262 can be provided with a locking mechanism consisting of a first hook 263, a second hook 264, a hook-linking rod 265, a first fixing member 172, and a second fixing member 173 to improve the stability of the connection between the wheelchair chassis 100 and the seat 200. The two first hooks 263 are connected to each end of the unlocking lever 262, and the unlocking handle 261 can be connected to the middle portion of the unlocking lever 262.

[0070] Please continue to refer to Figure 9 and Figure 10 In this embodiment, an unlocking handle mounting seat 266 can also be provided on the side of the seat 210 away from the backrest 220. The unlocking handle mounting seat 266 can be located in the middle of the wheelchair width direction, and the unlocking handle 261 can be slidably inserted into the unlocking handle mounting seat 266.

[0071] Please continue to refer to Figure 8 and Figure 9 In this embodiment, the adapter plate 280 is further provided with a first connector 281, and the chassis connection plate 170 is provided with a second connector 180. When the wheelchair chassis 100 and the seat 200 are integrally connected, the first connector 281 and the second connector 180 are electrically connected, thereby transmitting electrical energy from the wheelchair chassis 100 to the corresponding components on the seat 200. When the wheelchair chassis 100 and the seat 200 are separated, the wheelchair chassis 100 can be electrically connected to corresponding connectors on other devices via the second connector 180, thereby expanding the functions of the wheelchair chassis 100.

[0072] Please continue to refer to Figure 2 In this embodiment, the seat 200 further includes an armrest 250 , which is hinged to the backrest 220 .

[0073] Continue to refer to Figure 2 As shown, the rear bracket 130 includes a rear bracket body 131 and a rear bracket connecting section 132. The rear bracket connecting section 132 is disposed on a side of the rear bracket body 131 near the first end of the rear bracket 130. The front bracket 110 includes a front bracket body 111 and a front bracket connecting section 112. The front bracket connecting section 112 is disposed on a side of the front bracket body 111 near the first end of the front bracket 110. The wheelchair chassis 100 also includes a front connecting rod 150. The first end of the upper support frame 120 is hingedly connected to the first end of the rear bracket body 131, the second end of the upper support frame 120 is hingedly connected to the first end of the front bracket body 111, the first end of the front connecting rod 150 is hingedly connected to the rear bracket connecting section 132, and the second end of the front connecting rod 150 is hingedly connected to the front bracket body 111.

[0074] When the wheelchair is folded into one piece (e.g. Figure 1 The state shown is folded into Figure 3(When the wheelchair is in the state shown), the wheelchair chassis 100 can be folded first and then the seat 200; or the seat 200 can be folded first and then the wheelchair chassis 100; or the wheelchair chassis 100 and the seat 200 can be folded simultaneously, and the folding processes of the two do not interfere with each other.

[0075] When folding the chair 200, the armrest 250 can be folded toward the backrest 220 around the hinge point between the armrest 250 and the backrest 220. Then the backrest 220 can be folded toward the seat 210 around the hinge point between the backrest 220 and the seat 210.

[0076] When folding the wheelchair chassis 100, the upper support frame 120 can be first folded toward the rear support frame 130 around the hinge point between the upper support frame 120 and the rear support body 131. The front connecting rod 150 can then be folded toward the rear support frame 130 around the hinge point between the front connecting rod 150 and the rear support connecting section 132. Finally, the front support frame 110 can be folded toward the rear support frame 130 around the hinge point between the upper support frame 120 and the front support body 111, and the hinge point between the front connecting rod 150 and the front support connecting section 112.

[0077] When the seat 200 is folded individually (e.g. Figure 1 The state shown is folded into Figure 4 In the state shown in FIG, the armrest 250 can be folded toward the backrest 220 around the hinge point between the armrest 250 and the backrest 220. Then the backrest 220 can be folded toward the seat 210 around the hinge point between the backrest 220 and the seat 210.

[0078] When the wheelchair chassis 100 and the seat 200 are separated, the wheelchair chassis 100 and the seat 200 both have an unfolded state and a folded state relative to each other. When the seat 200 is switched from the unfolded state to the folded state (e.g., Figure 2 The state shown is folded into Figure 5 (when in the state shown), the wheelchair chassis 100 can be folded first and then the seat 200; or the seat 200 can be folded first and then the wheelchair chassis 100.

[0079] When folding the chair 200, the armrest 250 can be folded toward the backrest 220 around the hinge point between the armrest 250 and the backrest 220. Then the backrest 220 can be folded toward the seat 210 around the hinge point between the backrest 220 and the seat 210.

[0080] When folding the wheelchair chassis 100, the upper support frame 120 can be first folded toward the rear frame 130 around the hinge point between the upper support frame 120 and the rear frame body 131. Then, the front connecting rod 150 can be folded toward the rear frame 130 around the hinge point between the front connecting rod 150 and the rear frame connecting section 132. Finally, the front frame 110 can be folded toward the rear frame 130 around the hinge point between the upper support frame 120 and the front frame body 111, and the hinge point between the front connecting rod 150 and the front frame connecting section 112.

[0081] It should be noted that, in the process of folding the wheelchair chassis 100, the front bracket 110 may be folded first, then the front connecting rod 150 may be folded, and finally the upper support frame 120 may be folded. The specific folding steps may be selected according to the needs.

[0082] Please continue to refer to Figure 11 and Figure 12 When the wheelchair chassis 100 of this embodiment is in the unfolded state, the line connecting the hinge points of the front link 150 and the rear support connecting section 132 and the hinge points of the upper support frame 120 and the rear support body 131 is OA, and the line connecting the hinge points of the front link 150 and the rear support connecting section 132 and the hinge points of the front link 150 and the front support body 111 is OB. The angle α between OA and OB is greater than 90°. This layout allows the hinge points between adjacent rods on the wheelchair chassis 100 to be farther away from the rear wheels 102, giving the wheelchair a cleaner and more aesthetically pleasing appearance.

[0083] Furthermore, the wheelchair base frame 100 of this embodiment also includes a locking mechanism, which is used to control the locking of the upper support frame 120 and the front bracket 110 when the wheelchair base frame 100 is in the unfolded state, and to unlock the locked state of the upper support frame 120 and the front bracket 110 when the wheelchair base frame 100 is converted from the unfolded state to the folded state.

[0084] For example, Figure 14 As shown, the locking mechanism includes an unlocking rod 161, an unlocking spring 162, and a locking pin 163. The unlocking rod 161 is hingedly connected to the upper support frame 120 via an unlocking adapter plate 164. The locking pin 163 is provided on the front support body 111. The unlocking adapter plate 164 is provided with a chassis locking groove 1641 on the side facing the front support body 111. The first end of the unlocking spring 162 is fixedly connected to the upper support frame 120, and the second end of the unlocking spring 162 is fixedly connected to the unlocking rod 161, and the unlocking spring 162 is in a stretched state.

[0085] Combine Figure 14 It can be seen that the width of the front bracket 110 near one end of the upper support frame 120 is smaller than the width of other parts on the front bracket 110 (for example, it can be half the width of other parts); the width of the upper support frame 120 near one end of the front bracket 110 is smaller than the width of other parts on the upper support frame 120 (for example, it can be half the width of other parts). Through the above structure, after the end of the front bracket 110 and the end of the upper support frame 120 are matched, the sum of their widths is equal to the width of other parts on the front bracket 110 and the upper support frame 120, and the hinge point of the two is also set at this matching part, thereby ensuring that the width of the front bracket 110 and the upper support frame 120 after being hinged will not exceed the width of other parts on the front bracket 110 and the upper support frame 120.

[0086] When the wheelchair chassis 100 is in the unfolded state, the locking pin 163 is locked in the chassis locking slot 1641. At this point, the wheelchair chassis 100 is locked, and adjacent rods cannot be folded. The unlocking spring 162, in its stretched state, applies a certain preload force to the unlocking rod 161, thereby maintaining the locking pin 163 in the chassis locking slot 1641.

[0087] When the wheelchair chassis 100 transitions from the unfolded state to the folded state, the unlocking lever 161 moves, disengaging the locking pin 163 from the chassis locking slot 1641. For example, the unlocking lever 161 can be pulled, causing it to rotate, thereby disengaging the locking pin 163 from the chassis locking slot 1641. At this point, the wheelchair chassis 100 is unlocked, allowing adjacent members to fold. When the external force applied to the unlocking lever 161 is removed, the elastic force of the unlocking spring 162 reengages the locking pin 163 with the chassis locking slot 1641.

[0088] Please continue to refer to Figure 13 、 Figure 15 and Figure 16 In a possible implementation, the wheelchair of this embodiment further includes an anti-rollover assembly, which includes an anti-rollover wheel 310 and a linkage mechanism. The anti-rollover wheel 310 is rotatably mounted on the wheelchair chassis 100, and the linkage mechanism is located inside the wheelchair chassis 100. Figure 16 As shown, when the wheelchair chassis 100 is in the unfolded state, the linkage mechanism drives the anti-roll wheel 310 away from the ground, so that the anti-roll wheel 310 can be used to improve the stability of the wheelchair when traveling on uphill or bumpy roads, prevent backward rollover, and ensure the safety of the user. Figure 13 As shown, when the wheelchair base frame 100 is in the folded state, the linkage mechanism drives the anti-roll wheels 310 to abut against the ground, thereby utilizing the anti-roll wheels 310 to assist in supporting the wheelchair, so that the wheelchair base frame 100 can stand on the ground, reducing the floor space and facilitating the subsequent unfolding and use of the wheelchair.

[0089] For example, see Figure 15 As shown, the linkage mechanism of this embodiment includes an unlocking link 320 and a locking hook 330. The first end of the unlocking link 320 abuts against the first end of the upper support frame 120, and the second end of the unlocking link 320 is connected to the first end of the locking hook 330. The second end of the locking hook 330 is used to connect or separate with the anti-roll wheel 310.

[0090] When the wheelchair base frame 100 is converted from the unfolded state to the folded state, the first end of the upper support frame 120 rotates around the hinge point between the upper support frame 120 and the rear bracket 130, and drives the unlocking link 320 to move. The unlocking link 320 drives the locking hook 330 to separate from the anti-roll wheel 310. During the folding process of the wheelchair base frame 100, the anti-roll wheel 310 is in contact with the ground. The force applied to the anti-roll wheel 310 by the ground makes the anti-roll wheel 310 and the rear wheel 102 jointly support the wheelchair base frame 100, so that the wheelchair base frame 100 can stand on the ground.

[0091] Alternatively, see Figure 15 As shown, in this embodiment, a cam 340 is provided at the first end of the upper support frame 120, and the first end of the unlocking link 320 abuts against the surface of the cam 340. When the wheelchair base frame 100 is converted from the unfolded state to the folded state, the upper support frame 120 drives the cam 340 to rotate, so that the larger diameter surface of the cam 340 contacts the unlocking link 320, thereby driving the unlocking link 320 to move downward, thereby driving the locking hook 330 to separate from the anti-roll wheel 310.

[0092] Specifically, the rear bracket 130 of this embodiment further includes an anti-rollover mounting bracket 133. A cam 340 is disposed on the hinge axis between the first end of the upper support bracket 120 and the first end of the rear bracket body 131. When the upper support bracket 120 rotates about the rear bracket body 131, the cam 340 is driven to rotate synchronously. The anti-rollover mounting bracket 133 is fixedly connected to the second end of the rear bracket body 131. The anti-rollover wheel 310 is hingedly connected to the anti-rollover mounting bracket 133 via an anti-rollover connecting rod 350. The specific hinge point can be located in the middle of the anti-rollover connecting rod 350.

[0093] In this embodiment, the second end of the unlocking link 320 abuts the first end of the locking hook 330. The middle portion of the locking hook 330 is hingedly connected to the anti-roll mounting bracket 133. The anti-roll connecting rod 350 is provided with an anti-roll locking groove 351. The second end of the locking hook 330 is configured to engage with or disengage from the anti-roll locking groove 351. When the unlocking link 320 moves downward, it pushes the first end of the locking hook 330 downward, causing the locking hook 330 to rotate about the hinge point with the anti-roll mounting bracket 133. The second end of the locking hook 330 moves upward, thereby disengaging from the anti-roll locking groove 351.

[0094] Furthermore, the linkage mechanism of this embodiment includes a link return spring 360. The first end of the link return spring 360 is fixedly connected to the anti-roll wheel mounting bracket 133, and the second end of the link return spring 360 is connected to the unlocking link 320. When the unlocking link 320 moves downward, it pulls the link return spring 360. When the wheelchair base frame 100 transitions from the folded state to the unfolded state, the cam 340 no longer applies force to the unlocking link 320. Under the action of the link return spring 360, the unlocking link 320 is pulled upward, re-attaching to the surface of the cam 340 and driving the lock hook 330 to engage with the anti-roll wheel locking groove 351.

[0095] In this embodiment, an anti-roll wheel reset member 370 is further provided between the anti-roll wheel connecting rod 350 and the anti-roll wheel mounting frame 133. When the wheelchair base frame 100 is in the deployed state, the anti-roll wheel reset member 370 is in a free state. When the wheelchair base frame 100 is in the folded state, the anti-roll wheel reset member 370 is in a pre-tightened state (e.g., a compressed state). Exemplarily, the anti-roll wheel reset member 370 includes an anti-roll wheel reset torsion spring, which is mounted on the hinge axis between the anti-roll wheel connecting rod 350 and the anti-roll wheel mounting frame 133. When the wheelchair base frame 100 transitions from the folded state to the deployed state, the anti-roll wheel 310 can be ejected by the anti-roll wheel reset member 370, allowing the anti-roll wheel 310 to detach from the ground.

[0096] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0097] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed connection, detachable connection, or integration; they may refer to direct connection or indirect connection through an intermediate medium; they may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0098] It should be noted that in the description of this application, the terms "first" and "second" are used solely to facilitate the description of different components and should not be understood to indicate or imply a sequential relationship, relative importance, or implicitly specify the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one of such features.

[0099] The various embodiments or implementation methods in this application are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0100] In the description of this application, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of this application. In this application, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples.

[0101] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A wheelchair chassis, characterized in that: The wheelchair comprises a chassis connection portion, which is used to be detachably connected to the seat so that the wheelchair chassis and the seat have a connected state and a separated state, and when the wheelchair chassis and the seat are in the separated state, the wheelchair chassis has a relatively unfolded state and a folded state.

2. The wheelchair chassis according to claim 1, characterized in that: The wheelchair chassis comprises a front support, an upper support frame and a rear support, wherein the first end of the upper support frame is hingedly connected to the first end of the rear support, and the second end of the upper support frame is hingedly connected to the first end of the front support; When the wheelchair chassis is converted from the unfolded state to the folded state, the upper support frame is folded toward the rear support around the hinge point between the upper support frame and the rear support; the front support frame is folded toward the rear support around the hinge point between the upper support frame and the front support.

3. The wheelchair chassis according to claim 2, characterized in that: The width of the first end of the front bracket is smaller than the width of other parts on the front bracket, the width of the second end of the upper support bracket is smaller than the width of other parts on the upper support bracket, and the sum of the widths of the second end of the upper support bracket and the first end of the front bracket is equal to the width of other parts on the upper support bracket, or equal to the width of other parts on the front bracket.

4. The wheelchair chassis according to claim 2, characterized in that: The rear bracket comprises a rear bracket body and a rear bracket connecting section, wherein the rear bracket connecting section is arranged on a side of the rear bracket body close to the first end of the rear bracket; the front bracket comprises a front bracket body and a front bracket connecting section, wherein the front bracket connecting section is arranged on a side of the front bracket body close to the first end of the front bracket; the wheelchair chassis further comprises a front connecting rod, wherein the first end of the upper supporting frame is hingedly connected to the first end of the rear bracket body, the second end of the upper supporting frame is hingedly connected to the first end of the front bracket body, the first end of the front connecting rod is hingedly connected to the rear bracket connecting section, and the second end of the front connecting rod is hingedly connected to the front bracket body; When the wheelchair chassis is converted from the unfolded state to the folded state, the upper support frame is folded toward the rear frame around the hinge point between the upper support frame and the rear frame body; the front connecting rod is folded toward the rear frame around the hinge point between the front connecting rod and the rear frame connecting section; the front frame is folded toward the rear frame around the hinge point between the upper support frame and the front frame body and the hinge point between the front connecting rod and the front frame connecting section.

5. The wheelchair chassis according to claim 4, characterized in that: When the wheelchair chassis is in the unfolded state, the angle between the line connecting the hinge point of the front link and the rear bracket connecting section and the hinge point of the upper support frame and the rear bracket main body and the line connecting the hinge point of the front link and the rear bracket connecting section and the hinge point of the front link and the front bracket main body is greater than 90°.

6. The wheelchair chassis according to claim 2, characterized in that: The base frame connection part is arranged on the upper support frame, and the base frame connection part includes a limiting hole and a fixing pin. The limiting hole is used to be plugged with the limiting pin on the seat, and the fixing pin is used to be connected to or separated from the fixing hook on the seat.

7. The wheelchair chassis according to claim 2, characterized in that: The wheelchair chassis includes two opposite upper support frames, the chassis connecting portion is arranged between the two upper support frames, the chassis connecting portion includes a chassis connecting plate, the end of the chassis connecting plate is provided with a connecting groove, a first fixing member is provided in the connecting groove, and the first fixing member is used to engage or separate with a first hook on the seat.

8. The wheelchair chassis according to claim 2, characterized in that: It also includes a locking mechanism, which is used to lock the upper support frame and the front bracket when the wheelchair chassis is in the unfolded state, and to unlock the locked state of the upper support frame and the front bracket when the wheelchair chassis is converted from the unfolded state to the folded state.

9. The wheelchair chassis according to claim 8, characterized in that: The locking mechanism includes an unlocking pull rod, an unlocking tension spring and a locking pin, the unlocking pull rod is hingedly connected to the upper support frame through an unlocking adapter plate, the locking pin is arranged on the front bracket body, the unlocking adapter plate is provided with a bottom frame locking groove on a side facing the front bracket body, the first end of the unlocking tension spring is fixedly connected to the upper support frame, the second end of the unlocking tension spring is fixedly connected to the unlocking pull rod, and the unlocking tension spring is in a stretched state; When the wheelchair chassis is in the unfolded state, the locking pin is locked in the chassis locking groove; When the wheelchair chassis is converted from the unfolded state to the folded state, the unlocking rod moves to disengage the locking pin from the chassis locking groove.

10. The wheelchair chassis according to claim 4, characterized in that: It also includes an anti-roll wheel assembly, which includes an anti-roll wheel and a linkage mechanism. The anti-roll wheel is rotatably mounted on the wheelchair frame, and the linkage mechanism is located inside the wheelchair frame. When the wheelchair frame is in the unfolded state, the linkage mechanism drives the anti-roll wheel away from the ground. When the wheelchair frame is in the folded state, the linkage mechanism drives the anti-roll wheel to contact the ground.

11. The wheelchair chassis according to claim 10, characterized in that: The linkage mechanism includes an unlocking link and a locking hook, wherein the first end of the unlocking link abuts against the first end of the upper support frame, the second end of the unlocking link is connected to the first end of the locking hook, and the second end of the locking hook is used to connect to or separate from the anti-rollover wheel; When the wheelchair chassis is converted from the unfolded state to the folded state, the first end of the upper support frame rotates around the hinge point between the upper support frame and the rear bracket, and drives the unlocking link to move, and the unlocking link drives the locking hook to separate from the anti-roll wheel, so that the anti-roll wheel abuts against the ground.

12. The wheelchair chassis according to claim 11, characterized in that A cam is provided at the first end of the upper support frame, and the first end of the unlocking link abuts against the surface of the cam.

13. A wheelchair, characterized in that: The invention comprises a seat and a wheelchair chassis as claimed in any one of claims 1 to 12, wherein the wheelchair chassis is detachably connected to the seat.

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