Anti-rollover wheelchair chassis structure

Abstract

An anti-rollover wheelchair chassis structure comprises a wheelchair frame, two sets of supporting mechanisms and a control device, the supporting mechanisms are fixed to the outer ends of driving wheels on the two sides of the wheelchair frame respectively, and each supporting mechanism comprises a supporting base, a ratchet device, a supporting rod and a trigger device. The ratchet device is used for limiting one-way rotation of the supporting rod and is matched with the control device to trigger the supporting rod to pop out to form supporting when detecting inclination of the wheelchair. Meanwhile, the buffer device is arranged on the supporting rod, the telescopic support and the cross-shaped supporting plate can be unfolded synchronously when the supporting rod is unfolded, the supporting area is increased, and vibration generated by the supporting rod can be buffered. According to the design, a stronger supporting force arm can be provided during large-angle rollover, rollover torque is effectively counteracted, supporting failure is prevented, the running stability and safety of the wheelchair can be improved, and a more reliable rollover prevention guarantee is provided for a wheelchair user.

Description

Technical Field

[0001] This utility model relates to the field of wheelchair technology, specifically to an anti-tipping wheelchair chassis structure. Background Technology

[0002] In the field of wheelchair technology, anti-tipping functionality is one of the core requirements for ensuring user safety. Existing technology includes published patent documents (such as publication number CN119818302A, titled "An Intelligent Active Anti-Tipping Device for Wheelchairs") that propose an anti-tipping solution integrating mechanical support and an intelligent control system. This solution uses a gyroscope module to monitor the wheelchair's tilt angle in real time. When the tilt angle exceeds a preset threshold (e.g., 10°), a servo motor drives a support plate to unfold to provide auxiliary support, simultaneously triggering a voice alarm and remote emergency call function.

[0003] However, technical analysis reveals significant shortcomings in existing anti-rollover technologies for large angles. For instance, the support plate deployment logic only triggers a threshold when the tilt angle exceeds 10° (although this can be adjusted), but lacks a reinforced support mechanism for larger tilt angles (e.g., above 30°). This support structure (e.g., the single-axis connection between the support plate and the support base, and the limitation on the support plate deployment angle) results in insufficient support force when the wheelchair tilts sharply or encounters external impact, failing to effectively counteract the rollover moment. Analysis shows that when the wheelchair tilts at an angle exceeding 20°, the existing support plate's angle cannot provide sufficient support arm, leading to support failure. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology, this utility model provides an anti-rollover wheelchair chassis structure.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] An anti-tipping wheelchair chassis structure includes a wheelchair frame, a support mechanism, and a control device. The support mechanism has two sets of components, each fixed to the outer ends of the drive wheels on both sides of the wheelchair frame. The control device is installed in the lower middle part of the wheelchair frame and electrically connected to the support mechanism. The support mechanism includes a support base connected to the wheelchair frame, a ratchet device installed at the bottom of the support base, a support rod connected to the ratchet device at its bottom, and a trigger device fixed to the support base. The top of the support base is fixedly connected to the wheelchair frame, and the bottom extends downward. The fixed end of the ratchet device is connected to the support base, and the movable end is connected to the support rod. The ratchet device restricts the support rod to rotate downward in one direction. When the control device detects that the wheelchair is tilted, it sends an electrical signal to the trigger device. After receiving the electrical signal, the trigger device triggers a switch to pop the support rod outward, causing it to rotate rapidly downward. The support rod rotates until it contacts the ground, forming support under the reverse resistance of the ratchet device.

[0007] In this utility model, the support base is provided with a limiting groove extending in the vertical direction, and the bottom end of the support base is also provided with a mounting base. The ratchet device is mounted on the mounting base. Under normal conditions, the support rod is assembled in the limiting groove and is limited by a triggering device.

[0008] Furthermore, the triggering device includes a device housing mounted on a support base, a pin mounted inside the device housing, and a stepper motor mounted outside the device housing. One end of the pin is slidably mounted inside the device housing, and the other end passes through the support base and extends into a limiting groove to engage with the support rod and lock the support rod. The sliding end of the pin is also provided with a rack. The driving end of the stepper motor engages with the rack through a half gear. The stepper motor drives the pin to unlock and release the support rod through a gear and rack mechanism.

[0009] Furthermore, the limiting groove is provided with a return spring that pops outward. One end of the return spring is fixed in the limiting groove, and the support rod also presses the return spring when it is in the locked state.

[0010] Furthermore, the ratchet device includes a ratchet shaft, a movable seat, and a ratchet pin. The two ends of the ratchet shaft are fixed on the mounting base. The movable seat is rotatably mounted on the ratchet shaft. The ratchet pin is movably mounted inside the movable seat and engages with the ratchet on the ratchet shaft. The top of the movable seat is fixedly connected to the bottom of the support rod.

[0011] In this invention, the support rod is equipped with a buffer device, which includes a telescopic bracket installed on the outside of the support rod, a pneumatic actuator connected to the fixed end of the telescopic bracket, and a cross support plate connected to the telescopic end of the telescopic bracket. The telescopic bracket is composed of multiple intersecting connecting rods forming a telescopic structure. The driving end of the pneumatic actuator is connected to a connecting rod of the telescopic bracket. Sliding guide rails are respectively provided on the outside of the support rod and the inside of the cross support plate. A connecting rod at the fixed end and the telescopic end of the telescopic bracket slides on the sliding guide rail. When the control device controls the release of the support rod, it also simultaneously controls the pneumatic actuator to drive the telescopic bracket to unfold. The vibration generated by the support rod is transmitted to the pneumatic actuator through the telescopic bracket for buffering.

[0012] This utility model has the following advantages and beneficial effects:

[0013] By installing support mechanisms at the outer ends of the drive wheels on both sides of the wheelchair frame, and using a ratchet device to restrict the unidirectional rotation of the support rod, a control device triggers the support rod to extend and form support when the wheelchair is detected to tilt. Simultaneously, a buffer device on the support rod can simultaneously deploy a telescopic bracket and a cross support plate when the support rod extends, increasing the support area and cushioning vibrations generated by the support rod. This design not only provides a stronger support arm during large-angle rollovers, effectively counteracting rollover moments and preventing support failure, but also improves the stability and safety of wheelchair movement, providing wheelchair users with more reliable anti-rollover protection. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0015] Figure 1 This is a schematic diagram of the wheelchair in this embodiment;

[0016] Figure 2 This is a schematic diagram of the installation of the support mechanism in this embodiment;

[0017] Figure 3 This is a schematic diagram of the support mechanism in this embodiment;

[0018] Figure 4 This is a schematic diagram of the triggering device in this embodiment;

[0019] Figure 5 This is a schematic diagram of the ratchet device in this embodiment. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. However, this utility model is not limited to the following embodiments.

[0021] It should be noted that if any directional indication (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial, etc.) is involved in the embodiments of this utility model, the directional indication is only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0022] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0023] like Figures 1 to 5 As shown, this embodiment discloses an anti-tipping wheelchair chassis structure, including a wheelchair frame 1, a support mechanism 2, and a control device 3. The support mechanism 2 has two sets, which are respectively fixed to the outer ends of the drive wheels on both sides of the wheelchair frame 1. The control device 3 is installed in the lower middle part of the wheelchair frame 1 and is electrically connected to the support mechanism 2. The support mechanism 2 includes a support seat 21 connected to the wheelchair frame 1, a ratchet device 22 installed at the bottom of the support seat 21, a support rod 23 connected to the ratchet device 22 at the bottom, and a trigger device 24 fixed to the support seat 21. The top of the support seat 21 is fixedly connected to the wheelchair frame 1. The bottom extends downwards. The fixed end of the ratchet device 22 is connected to the support base 21, and the movable end is connected to the support rod 23. The ratchet device 22 restricts the support rod 23 to rotate downwards in one direction. When the control device 3 detects that the wheelchair is tilted, it sends an electrical signal to the trigger device 24. After receiving the electrical signal, the trigger device 24 triggers a switch, thereby popping the support rod 23 outwards and making it rotate downwards quickly. When it rotates to contact the ground, it forms a stable support under the action of the reverse resistance of the ratchet device 22. The outwardly extended support rod 23 can form a wider support arm, thereby providing effective support.

[0024] In this embodiment, the support base 21 is provided with a limiting groove 211 extending in the vertical direction, and the bottom end of the support base 21 is also provided with a mounting base 212. The ratchet device 22 is mounted on the mounting base 212. Under normal conditions, the support rod 23 is assembled in the limiting groove 211 and is limited by the triggering device 24.

[0025] Furthermore, the triggering device 24 includes a device housing 241 mounted on the support base 21, a pin 242 mounted inside the device housing 241, and a stepper motor 243 mounted outside the device housing 241. Specifically, one end of the pin 242 is slidably mounted inside the device housing 241, and the other end passes through the support base 21 and extends into the limiting groove 211 to cooperate with the support rod 23, thereby locking the support rod 23 in the limiting groove 211. The sliding end of the pin 242 is also provided with a rack 244, and the driving end of the stepper motor 243 is engaged with the rack 244 through a half gear 245. When the control device 3 detects the wheelchair tilting, it sends an electrical signal to the stepper motor 243. Subsequently, the pin 242 is unlocked through the gear and rack mechanism, releasing the support rod 23. To improve the unfolding speed of the support rod 23, a return spring 246 that pops outward is provided in the limiting groove 211. One end of the return spring 246 is fixed in the limiting groove 211. When the support rod 23 is locked, the return spring 246 is pressed by the support rod 23. When the trigger device 24 releases the support rod 23, the elastic force of the return spring 246 can increase the unfolding speed of the support rod 23.

[0026] Furthermore, the ratchet device 22 includes a ratchet shaft 221, a movable seat 222, and a ratchet pin 223. The two ends of the ratchet shaft 221 are fixed on the mounting base 212. The movable seat 222 is rotatably mounted on the ratchet shaft 221. The ratchet pin 223 is movably mounted inside the movable seat 222 and engages with the ratchet on the ratchet shaft 221. The top of the movable seat 222 is fixedly connected to the bottom of the support rod 23.

[0027] In this embodiment, to avoid strong vibrations caused by the reaction force after the support rod 23 is extended, which could cause discomfort to the user, a buffer device 25 is provided on the support rod 23. The buffer device 25 includes a telescopic bracket 251 installed on the outside of the support rod 23, a pneumatic actuator 252 connected to the fixed end of the telescopic bracket 251, and a cross support plate 253 connected to the telescopic end of the telescopic bracket 251. The telescopic bracket 251 is a common cross-telescopic structure composed of multiple connecting rods. The pneumatic actuator 252 is driven by... On a connecting rod of the telescopic bracket 251, the outer side of the support rod 23 and the inner side of the cross support plate 253 are respectively provided with sliding guide rails 254. The fixed end and telescopic end of the telescopic bracket 251 are respectively connected by a connecting rod that slides on the sliding guide rail 254. When the control device 3 controls the release of the support rod 23, it also controls the pneumatic push rod 252 to drive the telescopic bracket 251 to unfold. Due to the compressibility of gas, the vibration generated by the support rod 23 can be transmitted to the pneumatic push rod 252 through the telescopic bracket 251 for buffering.

[0028] The above description in this specification is merely an illustrative example of the present invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the specific embodiments described or adopt similar methods to replace them, as long as they do not deviate from the content of this specification or exceed the scope defined in the claims, they shall all fall within the protection scope of this invention.

Claims

1. A wheelchair chassis structure for preventing tipping over, characterized in that: The wheelchair includes a wheelchair frame (1), a support mechanism (2), and a control device (3). The support mechanism (2) has two sets of components, which are respectively fixed to the outer ends of the drive wheels on both sides of the wheelchair frame (1). The control device (3) is installed in the lower middle part of the wheelchair frame (1) and is electrically connected to the support mechanism (2). The support mechanism (2) includes a support base (21) connected to the wheelchair frame (1), a ratchet device (22) installed at the bottom of the support base (21), a support rod (23) connected to the ratchet device (22) at the bottom, and a trigger device (24) fixed on the support base (21). The top of the wheelchair is fixedly connected to the wheelchair frame (1), and the bottom extends downward. The fixed end of the ratchet device (22) is connected to the support seat (21), and the movable end is connected to the support rod (23). The ratchet device (22) restricts the support rod (23) from rotating downward in one direction. When the control device (3) detects that the wheelchair is tilted, it sends an electrical signal to the trigger device (24). After receiving the electrical signal, the trigger device (24) triggers the switch to pop the support rod (23) outward so that it rotates downward quickly. The support rod (23) rotates until it contacts the ground and forms support under the reverse resistance of the ratchet device (22).

2. The roll-over protective wheelchair chassis structure of claim 1, wherein: The support base (21) is provided with a limiting groove (211) extending in the vertical direction. The bottom end of the support base (21) is also provided with a mounting base (212). The ratchet device (22) is mounted on the mounting base (212). Under normal conditions, the support rod (23) is assembled in the limiting groove (211) and limited by the triggering device (24).

3. The roll-over protective wheelchair chassis structure of claim 2, wherein: The triggering device (24) includes a device housing (241) mounted on a support base (21), a pin (242) mounted inside the device housing (241), and a stepper motor (243) mounted outside the device housing (241). One end of the pin (242) is slidably mounted inside the device housing (241), and the other end passes through the support base (21) and extends into the limiting groove (211) to cooperate with the support rod (23) to lock the support rod (23). The sliding end of the pin (242) is also provided with a rack (244). The driving end of the stepper motor (243) cooperates with the rack (244) through a half gear (245). The stepper motor (243) drives the pin (242) to unlock and release the support rod (23) through the gear and rack mechanism.

4. The roll-over protective wheelchair chassis structure of claim 3, wherein: The limiting groove (211) is provided with a return spring (246) that pops outward. One end of the return spring (246) is fixed in the limiting groove (211). When the support rod (23) is in the locked state, it also presses the return spring (246) tightly.

5. The roll-over prevention wheelchair chassis structure according to claim 2, characterized by: The ratchet device (22) includes a ratchet shaft (221), a movable seat (222), and a ratchet pin (223). The two ends of the ratchet shaft (221) are fixed on the mounting base (212). The movable seat (222) is rotatably mounted on the ratchet shaft (221). The ratchet pin (223) is movably mounted inside the movable seat (222) and engages with the ratchet on the ratchet shaft (221). The top of the movable seat (222) is fixedly connected to the bottom of the support rod (23).

6. The roll-over prevention wheelchair chassis structure according to claim 1, characterized by: The support rod (23) is provided with a buffer device (25). The buffer device (25) includes a telescopic bracket (251) installed on the outside of the support rod (23), a pneumatic rod (252) connected to the fixed end of the telescopic bracket (251), and a cross support plate (253) connected to the telescopic end of the telescopic bracket (251). The telescopic bracket (251) is composed of multiple connecting rods forming a telescopic structure. The driving end of the pneumatic rod (252) is connected to a connecting rod of the telescopic bracket (251). The outer side of the rod (23) and the inner side of the cross support plate (253) are respectively provided with sliding guide rails (254). The fixed end and the telescopic end of the telescopic bracket (251) are respectively connected by a connecting rod that slides on the sliding guide rail (254). When the control device (3) controls the release of the support rod (23), it also controls the pneumatic rod (252) to drive the telescopic bracket (251) to unfold. The vibration generated by the support rod (23) is transmitted to the pneumatic rod (252) through the telescopic bracket (251) for buffering.

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