Anti-rollover mechanism for electric wheelchair

Abstract

This utility model provides an anti-tipping mechanism for electric wheelchairs, relating to the field of electric wheelchair assistive tools. It includes a central connecting column, which is a hollow structure. A wheelchair docking seat is welded to the top of the central connecting column. A drive motor is bolted inside the central connecting column. A synchronous rotating shaft is rotatably connected to the bottom of the central connecting column via a bearing. The drive motor connects to and drives the synchronous rotating shaft. By switching between two states, the electric wheelchair can be adjusted according to the required environment, ensuring good stability while maintaining the flexibility to navigate narrow passages and doorways. This solves the problem of adding auxiliary support wheels to the sides of the wheelchair to increase the effective lateral support span, which increases the overall width of the wheelchair, causing inconvenience when passing through narrow passages or doorways, affecting the flexibility and convenience of use, and resulting in similar electric wheelchairs not being able to simultaneously guarantee stability and maneuverability.

Description

Technical Field

[0001] This utility model relates to the field of electric wheelchair assistive tools, and in particular to an electric wheelchair anti-tipping mechanism. Background Technology

[0002] Electric wheelchairs are mobility aids that combine a drive unit, control unit, and battery with a traditional manual wheelchair. Users typically operate them using controllers such as joysticks, enabling them to move forward, backward, turn, and rotate in place. They are suitable for elderly people and people with disabilities who have difficulty moving around, allowing them to travel independently.

[0003] Traditional electric wheelchairs are prone to tipping over when traveling on inclined roads or steep slopes due to a shift in the center of gravity. To improve stability, a common method is to add auxiliary support wheels to the sides of the wheelchair to increase the effective lateral support span. However, this increases the overall width of the wheelchair, causing inconvenience when passing through narrow passages or doorways, affecting the flexibility and convenience of use. Consequently, similar electric wheelchairs cannot simultaneously guarantee stability and maneuverability. Utility Model Content

[0004] This utility model provides an anti-tipping mechanism for electric wheelchairs to solve the risk of tipping over when traditional electric wheelchairs are traveling on inclined roads or steep slopes due to a shift in the center of gravity. To improve stability, a common method is to add auxiliary support wheels to the side of the wheelchair to increase the effective lateral support span. However, this will increase the overall width of the wheelchair, causing inconvenience when passing through narrow passages or doorways, affecting the flexibility and convenience of use, and causing similar electric wheelchairs to not be able to guarantee both stability and passability at the same time.

[0005] This utility model provides an anti-tipping mechanism for electric wheelchairs, specifically including: a central connecting column, which is a hollow structure; a wheelchair docking seat welded to the top of the central connecting column; a drive motor installed inside the central connecting column by bolts; a synchronous rotating shaft rotatably connected to the bottom of the central connecting column by bearings; the drive motor connecting to and driving the synchronous rotating shaft; a rotating shaft screw fixedly connected to each end of the synchronous rotating shaft; a parallel guide rod vertically welded to the left and right surfaces of the central connecting column; a lateral pusher provided on the left and right sides of the central connecting column; a pusher guide hole opened inside the lateral pusher, the pusher guide hole slidably connected to the parallel guide rod; a lateral push hole opened in the center of the lateral pusher, the lateral push hole helically connected to the rotating shaft screw; and an elastic support shaft connected to the end of the lateral pusher, the elastic support shaft rotatably connected to a balance auxiliary support wheel by bearings.

[0006] Furthermore, the drive motor shaft is fixedly connected to a drive gear, and the synchronous rotating shaft is fixedly connected to a driven gear, with the drive gear and the driven gear meshing together.

[0007] Furthermore, the screw threads on the left and right sides of the synchronous rotating shaft rotate in opposite directions.

[0008] Furthermore, an "L"-shaped spring bracket is fixedly connected to the upper surface of the lateral pusher.

[0009] Furthermore, one end of the elastic support shaft facing the central connecting column is hinged to the outer end of the lateral pusher.

[0010] Furthermore, the end of the elastic support shaft is hinged to a limiting frame that is fixedly connected to it by bolts, and the limiting frame has a "U" shaped structure.

[0011] Furthermore, when the elastic support shaft is parallel to the lateral pusher, the inner wall of the limiting frame is in contact with the lower surface of the lateral pusher.

[0012] Furthermore, a buffer top spring is fixedly connected above the elastic support shaft, and a spring bracket is fixedly connected to the upper end of the buffer top spring.

[0013] This utility model provides an anti-tipping mechanism for electric wheelchairs, which has the following beneficial effects: The anti-tipping mechanism for electric wheelchairs in this invention is installed at the bottom of the electric wheelchair and has two states: retracted and extended. When driving normally without traversing inclined surfaces, the balance auxiliary wheels retract into the bottom of the electric wheelchair, remaining hidden and not affecting the overall width of the wheelchair. This allows the electric wheelchair to pass through narrow passages and doorways without affecting normal driving and operation. However, when driving on inclined surfaces or steep slopes, the anti-tipping mechanism needs to be extended, causing the two balance auxiliary wheels to move outward, increasing the overall width of the electric wheelchair and thus increasing the effective lateral support span, reducing the risk of tipping over due to a shift in the center of gravity. By switching between these two states, the electric wheelchair can be adjusted according to the required environment, ensuring both good stability and the flexibility to navigate narrow passages and doorways.

[0014] In addition, the movable support structure of the balance assist wheel allows the balance assist wheel to provide stable lateral support while reducing vibrations when driving over uneven ground, thus reducing bumps during the electric wheelchair's operation and improving its stability. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments will be briefly described below.

[0016] The accompanying drawings described below are only related to some embodiments of the present invention and are not intended to limit the present invention.

[0017] In the attached diagram: Figure 1 A schematic diagram of the structure of this application installed in a wheelchair is shown; Figure 2 This diagram shows the structural schematic of the bottom when the present application is combined with a wheelchair; Figure 3 This diagram shows the structure of the anti-rollover mechanism of this application when it is deployed; Figure 4 A schematic diagram of the main structure of the anti-rollover mechanism of this application is shown; Figure 5 This application shows Figure 4 Front view structural diagram; Figure 6 A schematic diagram of the structure of the elastic support shaft of this application is shown; Figure 7 The structure of the rotary lead screw and the lateral pusher of this application is shown.

[0018] Figure label: 1. Central connecting column; 2. Wheelchair docking seat; 3. Drive motor; 301. Drive gear; 4. Synchronous rotating shaft; 401. Driven gear; 402. Rotating shaft lead screw; 5. Parallel guide rod; 6. Lateral push frame; 601. Push frame guide hole; 602. Lateral push hole; 603. Spring connecting frame; 7. Elastic support shaft; 701. Limiting frame; 702. Buffer top spring; 8. Balance auxiliary support wheel. Detailed Implementation

[0019] 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. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the described embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] Example 1: Please refer to Figures 1 to 7 : This utility model proposes an anti-tipping mechanism for electric wheelchairs, comprising: a central connecting column 1, which is a hollow structure; a wheelchair docking seat 2 welded to the top of the central connecting column 1; a drive motor 3 installed inside the central connecting column 1 by bolts; a synchronous rotating shaft 4 rotatably connected to the bottom of the central connecting column 1 by bearings; the drive motor 3 connected to and driving the synchronous rotating shaft 4; a drive gear 301 fixedly connected to the rotating shaft of the drive motor 3; a driven gear 401 fixedly connected to the synchronous rotating shaft 4; the drive gear 301 and the driven gear 401 meshing with each other; a rotating shaft screw 402 fixedly connected to each end of the synchronous rotating shaft 4, the rotating shaft screw 402 being perpendicular to the side of the synchronous rotating shaft 4; a parallel guide rod 5 vertically welded to the left and right surfaces of the central connecting column 1; a lateral pusher 6 provided on the left and right sides of the central connecting column 1; and a pusher guide hole 601 opened inside the lateral pusher 6. The parallel guide rod 5 is slidably connected, and the lateral push frame 6 has a lateral push hole 602 at its center. The lateral push hole 602 is helically connected to the rotating shaft screw 402. The end of the lateral push frame 6 is connected to an elastic support shaft 7, and the elastic support shaft 7 is rotatably connected to the balance auxiliary support wheel 8 through a bearing. The wheelchair docking seat 2 is fixedly connected to the bottom support of the wheelchair, so that the anti-rollover mechanism is stably installed at the center of the bottom of the wheelchair. When traveling on an inclined road, the drive motor 3 is controlled by the remote control of the drive motor 3 to rotate. Under the action of the gear transmission formed by the meshing of the drive gear 301 and the driven gear 401, the synchronous rotating shaft 4 is driven to rotate. The rotation of the rotating shaft screw 402 and the lateral push hole 602 form a helical transmission, pushing the two lateral push frames 6 outward respectively, so that the lateral push frames 6 extend outward, pushing the elastic support shaft 7 and the balance auxiliary support wheel 8 to move to the side of the wheelchair, increasing the effective lateral support span and reducing the probability of rollover caused by the center of gravity shift.

[0021] In this embodiment, the left and right screws 402 of the synchronous rotating shaft 4 rotate in opposite directions. The two screws 402 are respectively connected to the lateral push holes 602 in the two side push frames 6 and form a screw drive. When the synchronous rotating shaft 4 rotates in one direction, the lateral push frames 6 can be controlled to move closer or further away at the same time, thereby realizing the adjustment of the distance between the two balance auxiliary support wheels 8 and the electric wheelchair.

[0022] In this embodiment, an "L"-shaped spring bracket 603 is fixedly connected to the upper surface of the lateral push frame 6. One end of the elastic support shaft 7 facing the central connecting column 1 is hinged to the outer end of the lateral push frame 6. When the elastic support shaft 7 is parallel to the lateral push frame 6, the inner wall of the limiting frame 701 is in contact with the lower surface of the lateral push frame 6. A buffer top spring 702 is fixedly connected to the upper part of the elastic support shaft 7, and the upper end of the buffer top spring 702 is fixedly connected to the spring bracket 603. Under normal conditions, the elastic support shaft 7 maintains a horizontal docking with the lateral push frame 6 under the support of the buffer top spring 702. When the balance auxiliary support wheel 8 travels over uneven ground, the elastic support shaft 7 will rotate upward by a small angle and compress the buffer top spring 702, thereby playing a role in buffering and shock absorption, preventing the electric wheelchair from tilting when passing small obstacles during travel. At the same time, the support of the elastic support shaft 7 by the buffer top spring 702 provides lateral support for the electric wheelchair when traveling on inclined roads, reducing the risk of the electric wheelchair tipping over.

[0023] In Example 2, based on Example 1, a limiting frame 701 is fixedly connected to the hinged shaft at the end of the elastic support shaft 7 by bolts. The limiting frame 701 has a "U" shaped structure. With the setting of the limiting frame 701, under the pushing action of the buffer top spring 702, the elastic support shaft 7 remains straight with the side push frame 6 under normal conditions, and the limiting frame 701 is in close contact with the lower surface of the side push frame 6, which plays a limiting role and prevents the elastic support shaft 7 from bending downward and falling under the pushing action of the buffer top spring 702.

[0024] The working principle of this embodiment is as follows: Under normal conditions, the lateral pushers 6 are close to the central connecting column 1, causing the balance auxiliary support wheels 8 to retract into the space under the electric wheelchair, thus hiding them. This does not affect the overall width of the electric wheelchair, allowing it to pass through narrow passages and doorways without affecting normal driving and operation. When traversing an inclined road surface, the user controls the drive motor 3 to rotate via a remote control. Under the action of gear transmission formed by the meshing of the drive gear 301 and the driven gear 401, the synchronous rotating shaft 4 rotates. Through the rotation of the rotating shaft screw 402 and the lateral push hole 602, a helical transmission is formed, pushing the two lateral pushers 6 outwards respectively. This causes the lateral pushers 6 to extend outwards, pushing the elastic support shaft 7 and the balance auxiliary support wheels 8 to move to the side of the wheelchair. The laterally extended balance auxiliary support wheels 8 contact the road surface, providing lateral support for the electric wheelchair when traveling on an inclined road, reducing the risk of the electric wheelchair tipping over, increasing the effective lateral support span, and reducing the risk of tipping over due to center of gravity shift.

[0025] The following points should be noted in this article: 1. The accompanying drawings of the embodiments disclosed herein only relate to the structures involved in the embodiments disclosed herein; other structures can be referred to in general design.

[0026] 2. Where there is no conflict, the embodiments of this disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0027] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. An anti-tipping mechanism for an electric wheelchair, comprising: A central connecting column (1) is characterized in that it is a hollow structure, a wheelchair docking seat (2) is welded to the top of the central connecting column (1), a drive motor (3) is installed inside the central connecting column (1) by bolts, a synchronous rotating shaft (4) is rotatably connected to the bottom of the central connecting column (1) by bearings, the drive motor (3) is connected to and drives the synchronous rotating shaft (4), and a rotating shaft screw (402) is fixedly connected to each end of the synchronous rotating shaft (4). The rotating shaft screw (402) is perpendicular to the side of the synchronous rotating shaft (4). A parallel guide rod (5) is vertically welded to the left and right surfaces respectively. A lateral pusher (6) is provided on the left and right sides of the central connecting column (1). A pusher guide hole (601) is opened inside the lateral pusher (6). The pusher guide hole (601) is slidably connected to the parallel guide rod (5). A lateral push hole (602) is opened in the center of the lateral pusher (6). The lateral push hole (602) is spirally connected to the rotating shaft screw (402). An elastic support shaft (7) is connected to the end of the lateral pusher (6). The elastic support shaft (7) is rotatably connected to the balance auxiliary support wheel (8) through the bearing.

2. The anti-tipping mechanism for an electric wheelchair according to claim 1, characterized in that, The drive motor (3) has a fixed shaft connected to a drive gear (301), and the synchronous rotating shaft (4) has a fixed shaft connected to a driven gear (401). The drive gear (301) and the driven gear (401) are meshed together.

3. The anti-tipping mechanism for an electric wheelchair according to claim 2, characterized in that, The left and right screws (402) of the synchronous rotating shaft (4) have opposite spiral directions.

4. The anti-tipping mechanism for an electric wheelchair according to claim 1, characterized in that, The upper surface of the lateral pusher (6) is fixedly connected to an "L"-shaped spring bracket (603).

5. The anti-tipping mechanism for an electric wheelchair according to claim 4, characterized in that, The end of the elastic support shaft (7) facing the central connecting column (1) is hinged to the outer end of the lateral pusher (6).

6. The anti-tipping mechanism for an electric wheelchair according to claim 5, characterized in that, The end of the elastic support shaft (7) is hinged to a limiting frame (701) and fixedly connected to it by bolts. The limiting frame (701) has a "U" shaped structure.

7. The anti-tipping mechanism for an electric wheelchair according to claim 6, characterized in that, When the elastic support shaft (7) is parallel to the lateral pusher (6), the inner wall of the limiting frame (701) is in contact with the lower surface of the lateral pusher (6).

8. The anti-tipping mechanism for an electric wheelchair according to claim 7, characterized in that, A buffer top spring (702) is fixedly connected above the elastic support shaft (7), and a spring bracket (603) is fixedly connected to the upper end of the buffer top spring (702).

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