Wheelchair lift device

Abstract

This utility model belongs to the field of automotive parts technology and discloses a wheelchair lifting device, including two sets of lifting arm bodies, a carrying platform and a base, as well as two sets of support member drive mechanisms and support members. The two sets of support member drive mechanisms are symmetrically installed on the support plates on both sides of the carrying platform and move synchronously up and down with the carrying platform driven by the lifting arm bodies. The two ends of the support members are respectively driven and connected to the two sets of support member drive mechanisms, and the support members are driven by the support member drive mechanisms to detach from or support the carrying platform, ensuring that when the carrying platform is in the retracted state, the support members are lower than the bottom surface of the carrying platform, and when the carrying platform is in the extended state, the support members support the carrying platform. This utility model achieves concealed storage of the support members while ensuring the stable operation of the carrying platform, eliminating the safety hazards caused by physical protrusions and maintaining the required rigidity and strength of the mechanism, providing a safer and more reliable barrier-free travel solution, especially for passengers with mobility impairments.

Description

Technical Field

[0001] This utility model belongs to the field of automotive parts technology, and specifically relates to a wheelchair lift device. Background Technology

[0002] Wheelchair lifts are assistive devices installed in vehicles such as welfare vehicles and accessible taxis. They primarily help wheelchair users get in and out of the vehicle safely and conveniently. They consist of a support platform, lifting mechanism, drive system, and safety devices. To accommodate the limited space inside the vehicle, existing designs typically employ a left-right folding storage structure (such as...). Figure 1 As shown), the load-bearing platform is folded vertically on both sides of the vehicle body.

[0003] However, in this structure, the support component 5 (typically 4-15cm high) is fixed or welded to the rear of the side support plates as part of the platform. Therefore, when the platform is folded down, the front platform folds to the sides, but the rear support component 5 remains vertical in the passageway. While this structure ensures stable fastening and synchronized movement of the side support plates and platform during unfolding, the protruding support crossbars in the folded state can easily trip passengers, posing a safety hazard, especially for the elderly, children, and visually impaired individuals. Currently, the industry has attempted to optimize this by designing lower crossbars, detachable crossbars, or eliminating crossbars altogether, but these solutions suffer from insufficient strength, cumbersome operation, or instability. Therefore, developing a wheelchair lift device that ensures both structural stability and completely eliminates the risk of tripping is urgently needed. Utility Model Content

[0004] To address the issue of tripping risks caused by exposed support components and the difficulty in achieving both structural rigidity and stability in existing technologies, this invention provides a wheelchair lift device. While ensuring the stable operation of the support platform, it achieves concealed storage of the support components, eliminating the safety hazards caused by physical protrusions while maintaining the required rigidity and strength of the mechanism. This provides a safer and more reliable barrier-free travel solution, especially for passengers with mobility impairments.

[0005] The main technical solution adopted in this utility model is as follows:

[0006] A wheelchair lifting device includes two sets of lifting arm bodies, a carrying platform, and a base. It also includes two sets of support member drive mechanisms and support members. The two sets of support member drive mechanisms are symmetrically installed on the support plates on both sides of the carrying platform and move synchronously up and down with the carrying platform driven by the lifting arm bodies. The two ends of the support members are respectively driven to be connected to the two sets of support member drive mechanisms, and the support members are driven by the support member drive mechanisms to detach from or support the carrying platform, ensuring that when the carrying platform is in the retracted state, the support members are lower than the bottom surface of the carrying platform, and when the carrying platform is in the unfolded state, the support members support the carrying platform.

[0007] Preferably, each set of support member drive mechanisms includes a rotating connecting plate, a guide member, an elastic tension member, and a guide rail. The rotating connecting plate is rotatably mounted on the support plate via a rotating connection point and rotates around the rotating connection point. The guide member is mounted at the rear end of the rotating connecting plate. The support member is mounted at the front end of the rotating connecting plate via a support connection point. The fixed end of the elastic tension member is rotatably connected to the lifting arm body, and the driving end is rotatably connected to the rotating connecting plate. The elastic tension member is located between the rotating connection point and the support connection point. The guide rail is mounted on the base and is used to cooperate with the guide member for guidance.

[0008] Preferably, the support plate is provided with a receiving groove for accommodating and accommodating the support member.

[0009] Preferably, the auxiliary arm of the lifting arm body is coaxially and rotatably mounted on the support plate with the rotating connecting plate.

[0010] Preferably, the guide rail is inclined downward along the unfolding direction of the support platform.

[0011] Beneficial effects: This utility model provides a wheelchair lifting device, which has the following advantages:

[0012] (1) In this utility model, the support member driving mechanism is used to drive the support member to detach from or support the carrier platform according to the storage or unfolding state of the carrier platform, thereby achieving dual function protection: when the carrier platform is stored, the support member automatically retracts to below the bottom of the carrier platform, completely eliminating the safety hazards caused by exposed obstacles; when the platform is unfolded for use, the support member can reliably provide rigid support for the carrier platform to ensure structural strength, while ensuring the synchronous movement of the left and right carrier platforms to ensure the stability of the unfolding or storage movement.

[0013] (2) In this utility model, the rotation connection point between the rotating connecting plate and the support plate, the connection point between the elastic tension member and the rotating connecting plate, and the connection point between the support member and the rotating connecting plate form a stable mechanical triangular relationship, which is conducive to improving the stability and smoothness of the overall structure of the device and ensuring the reliability of the mechanism operation. Attached Figure Description

[0014] Figure 1 A schematic diagram of an existing wheelchair lift device;

[0015] Figure 2 This is a schematic diagram of the overall structure of Embodiment 1 (in its stored state);

[0016] Figure 3 This is a schematic diagram of the overall structure of Embodiment 1 (in unfolded state);

[0017] Figure 4 This is a vertical side sectional view (in the stowed state) of Embodiment 1.

[0018] Figure 5 This is a partial structural diagram of Embodiment 1;

[0019] Figure 6 This is a partial structural diagram of the support member drive mechanism in Embodiment 1 (in its stowed state).

[0020] Figure 7 This is a partial structural diagram of the support member drive mechanism in Embodiment 1 (in its initial unfolded state).

[0021] Figure 8 This is a partial structural diagram of the support member drive mechanism in Embodiment 1 (fully unfolded state).

[0022] In the diagram: Lifting arm main body 1, auxiliary arm 1-1, main arm 1-2, bearing platform 2, support plate 2-1, left bearing platform 2-2, right bearing platform 2-3, receiving slot 2-11, base 3, support component drive mechanism 4, rotating connecting plate 4-1, rotating connection point 4-11, support connection point 4-12, tension connection point 4-13, guide component 4-2, elastic tension component 4-3, guide rail 4-4, support component 5. Detailed Implementation

[0023] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application are clearly and completely described below. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application. Example 1

[0024] like Figures 2 to 5 As shown, this embodiment provides a wheelchair lifting device, including two sets of lifting arm bodies 1, a support platform 2, a base 3, two sets of support drive mechanisms 4, and support members 5. Among them,

[0025] The support platform 2 adopts a split design, consisting of a left support platform 2-2 and a right support platform 2-3, which are independently driven by two sets of lifting arm bodies 1 to achieve synchronous lifting, unfolding or retracting movements.

[0026] The lifting arm body 1 includes a main arm 1-2 and an auxiliary arm 1-1, wherein the auxiliary arm 1-1 is connected to the support plate 2-1 of the bearing platform 2 via a hinge point. When the device is in operation, the main arm 1-2 drives the left and right bearing platforms to move up and down, while the auxiliary arm 1-1 drives them to unfold or retract. In the unfolded state, the left and right bearing platforms interlock to form a stable bearing platform 2; in the retracted state, they fold inward to save space.

[0027] Two sets of support drive mechanisms 4 are symmetrically installed on the support plates 2-1 on both sides of the carrying platform 2, and rise and fall synchronously with the carrying platform 2 under the drive of the lifting arm body 1. In this embodiment 1, each set of support drive mechanisms 4 includes a rotating connecting plate 4-1, a guide member 4-2, an elastic tension member 4-3, and a guide rail 4-4. The rotating connecting plate 4-1 is rotatably installed on the support plate 2-1 through the rotating connection point 4-11, and can rotate freely around this point. The guide member 4-2 is installed at the rear end of the rotating connecting plate 4-1, the support member 5 is installed at the front end of the rotating connecting plate 4-1 through the support connection point 4-12, the fixed end of the elastic tension member 4-3 is rotatably installed on the lifting arm body 1 (e.g., the auxiliary arm 1-1), and the driving end is rotatably installed on the rotating connecting plate 4-1 through the tension connection point 4-13, and is located between the rotating connection point 4-11 and the support connection point 4-12, thereby providing a continuous reset tension. The guide rail 4-4 is fixed to the base 3 and is inclined downward along the unfolding direction of the support platform 2 to cooperate with the guide component 4-2 for guidance. The inclination angle of the guide rail 4-4 can be designed according to the actual required support force and movement trajectory.

[0028] In this embodiment 1, the two ends of the support member 5 are respectively driven and connected to two sets of support member driving mechanisms 4, and the support member 5 is driven by the support member driving mechanism 4 to detach from or support the bearing platform 2. In order to further ensure the stable support of the support member 5, in this embodiment 1, a receiving groove 2-11 is also provided on the bottom surface of the support plate 2-1 to accommodate the support member 5.

[0029] When the carrying platform 2 begins to unfold, the two ends of the support member 5 abut against the receiving grooves 2-11 at the bottom of the mounting plates 2-1 on both sides. This provides a stable support structure for the carrying platform 2, ensuring its stability in the unfolded state and guaranteeing structural strength. Furthermore, it connects the support plates 2-1 on both sides, ensuring that the independently driven left and right carrying platforms can move up and down synchronously and stably, preventing deviations in movement and affecting the coordinated unfolding of the left and right carrying platforms. When the carrying platform 2 rises into its retracted state, the elastic tension member 4-3 pulls the rotating connecting plate 4-1 to rotate, causing the support member 5 to detach from the carrying platform 2 and retract below its bottom surface (e.g., ...). Figure 4 As shown in the figure, this eliminates the physical protrusion of the support 5, making it easier for the user to move.

[0030] To further improve motion stability, the auxiliary arm 1-1 of the lifting arm body 1 and the rotating connecting plate 4-1 are coaxially mounted on the support plate. The rotating connection point 4-11, the support connection point 4-12 and the tension connection point 4-13 together form a triangular stable structure to ensure that the motion trajectory of the support 5 is accurate and reliable.

[0031] In this embodiment 1, the lifting arm body 1 can adopt an existing scissor-type or linkage mechanism. The specific drive connection method of the lifting arm body of the left and right bearing platforms and the specific working principle of the lifting arm body driving the left and right bearing platforms are well known to those skilled in the art, so they are not described in detail.

[0032] In this embodiment 1, the guide component 4-2 is preferably a guide wheel to reduce frictional resistance, but any existing parts that can achieve sliding guidance can be used, such as sliders or other sliding guide components. The elastic tension component 4-3 can be, but is not limited to, a tension spring rod structure; any existing tension device with a reset function is applicable.

[0033] In this embodiment 1, the support member 5 can be a rigid structure such as a round rod or a square rod, with both ends connected to the support connection point 4-12 at the front end of the rotating connecting plate 4-1, so as to achieve flexible swinging. The shape of the receiving groove 2-11 can be designed according to the support member.

[0034] In this embodiment 1, the support member 5 is preferably a round tie rod, and the receiving groove 2-11 is preferably an arc-shaped groove to match the shape of the support member 5. In order to reduce friction and wear, a rubber pad is also installed on the contact surface of the receiving groove 2-11.

[0035] The working principle of this invention is as follows:

[0036] When stored (e.g.) Figure 6 As shown): Guide member 4-2 is housed in guide rail 4-4, which provides support. This support force drives the front end of rotating connecting plate 4-1 to move downward around rotating connection point 4-11, thereby causing support member 5 connected to the front end of rotating connecting plate 4-1 to disengage from receiving groove 2-11 of support plate 2-1 and continue to move downward until support member 5 drops to a position lower than the bottom surface of bearing platform 2 (specifically lower than rear baffle in this embodiment), thus eliminating the safety hazard caused by the physical protrusion of support member 5. During this process, elastic tension member 4-3 is stretched as rotating connecting plate 4-1 rotates, generating tension on rotating connecting plate 4-1.

[0037] In the initial unfolding state (e.g.) Figure 7As shown): The rotating connecting plate 4-1 extends and unfolds along with the carrying platform under the drive of the lifting arm body 1; when the guide member 4-2 leaves the guide rail 4-4 (i.e. loses the support of the guide rail 4-4) or the supporting force it receives is less than the pulling force of the elastic tension member 4-3 on the rotating connecting plate 4-1, the front end of the rotating connecting plate 4-1 moves upward around the rotating connection point 4-11 under the pulling force of the elastic tension member 4-3, pushing the support member 5 at its front end to be inserted into the receiving groove 2-11 of the support plate 2-1. The support member 5 connects the support plates on both sides and begins to support the carrying platform 2. Since the rotating connecting plate 4-1 is installed on the support plate of the carrying platform 2 and moves up and down synchronously with it, under the continuous action of the elastic tension member 4-3 and the weight of the carrying platform 2 itself, the support member 5 can be stably kept in the receiving groove 2-11, effectively ensuring the synchronous operation of both sides of the carrying platform 2.

[0038] When fully unfolded (e.g.) Figure 8 As shown): The support drive mechanism 4 (excluding the guide rail 4-4 fixed to the base) and the support 5 follow the support platform 2 as it descends to the lowest point under the drive of the lifting arm body 1; at this time, the support 5 is stably located in the receiving groove 2-11 of the support plate 2-1, continuously supporting the support platform 2, so that the left and right support plates of the support platform 2 can be reliably fastened together, ultimately forming a stable and flat wheelchair support platform.

[0039] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A wheelchair lift device, comprising two sets of lifting arm bodies, a support platform, and a base, characterized in that, It also includes two sets of support drive mechanisms and support members. The two sets of support drive mechanisms are symmetrically installed on the support plates on both sides of the carrying platform, and move synchronously up and down with the carrying platform driven by the lifting arm body. The two ends of the support members are respectively driven to connect to the two sets of support drive mechanisms, and the support members are driven by the support drive mechanisms to detach from or support the carrying platform, ensuring that when the carrying platform is in the storage state, the support members are lower than the bottom surface of the carrying platform, and when the carrying platform is in the unfolded state, the support members support the carrying platform.

2. The wheelchair lifting device according to claim 1, characterized in that, Each set of support member drive mechanisms includes a rotating connecting plate, a guide member, an elastic tension member, and a guide rail. The rotating connecting plate is rotatably mounted on the support plate via a rotating connection point and rotates around the rotating connection point. The guide member is mounted at the rear end of the rotating connecting plate. The support member is mounted at the front end of the rotating connecting plate via a support connection point. The fixed end of the elastic tension member is rotatably connected to the lifting arm body, and the driving end is rotatably connected to the rotating connecting plate. The elastic tension member is located between the rotating connection point and the support connection point. The guide rail is mounted on the base and is used to cooperate with the guide member for guidance.

3. The wheelchair lift device according to claim 2, characterized in that, The support plate is provided with a receiving groove for accommodating and accommodating the support component.

4. The wheelchair lifting device according to claim 2, characterized in that, The auxiliary arm of the lifting arm body is coaxially and rotatably mounted on the support plate with the rotating connecting plate.

5. The wheelchair lift device according to claim 2, characterized in that, The guide rail is inclined downwards along the unfolding direction of the support platform.

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