Foldable Vehicle Ramp Assembly for Compact Door Integration
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Solution Overview
Problem
Existing passenger vehicles lack a ramp system that can be seamlessly integrated into modified passenger doors without requiring significant structural modifications, particularly for accommodating wheelchair users.
Innovation Solution
A ramp assembly comprising a first and second ramp plate, a ramp assist assembly, and a link system with a slide mechanism, utilizing a clock spring and flexible link for deployment and retraction, allowing the ramp to be stowed and deployed efficiently within the vehicle's modified door opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a ramp system is added to accommodate wheelchair users, then accessibility is improved, but device complexity and structural modification requirements increase
Solution Approach 1:
The ramp assembly is divided into multiple segments including a first ramp plate, a second ramp plate, and a third ramp plate that can be independently positioned and connected. This segmentation allows the ramp to navigate around existing vehicle structures while providing continuous wheelchair access, resolving the contradiction between accessibility and device complexity by breaking down the complex access problem into manageable modular components
Solution Approach 2:
The ramp assembly is designed to nest within the vehicle's existing door structure and modified opening. When not in use, the ramp plates fold and store within the door assembly, minimizing space requirements. This nesting approach allows the complex ramp system to be integrated into the vehicle without requiring excessive structural modification, as the ramp occupies minimal space when stowed
2Adaptability or versatility
If the door opening is widened to accommodate wheelchair access, then accessibility is improved, but structural modification requirements increase
Solution Approach 1:
Rather than widening the entire door opening, the ramp assembly is designed to fit within a localized modified portion of the door. The ramp plates are configured to navigate through a specifically modified section of the door structure, minimizing the overall structural changes required while still providing adequate wheelchair access through targeted local modifications
3Ease of manufacture
If a compact ramp system is used to fit within modified door openings, then ease of manufacture is improved, but device complexity increases
Solution Approach 1:
The ramp assembly employs dynamic folding mechanisms that allow the ramp plates to transition between extended and retracted positions. The connective structures include articulated joints and linkages that enable the ramp to adapt its configuration during deployment and storage, allowing a compact design to achieve full wheelchair access when needed while maintaining ease of installation through standardized dynamic components
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables easy access for wheelchair users by providing a compact, efficient, and adaptable ramp system that fits within existing vehicle modifications, enhancing usability and accessibility without extensive structural changes.
Implementation Method 1
A ramp fold arm assembly is coupled to the ramp assist assembly and to the first ramp plate, wherein the ramp assist assembly directs deployment and retraction of the ramp plate
Data Source
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AI summary
A ramp assembly for providing passenger access to a passenger vehicle. The ramp assembly includes a ramp having a first ramp plate, a second ramp plate rotatably coupled to the first ramp plate, and a ramp assist assembly. A ramp fold arm is coupled to the ramp assist assembly and to the first ramp plate, wherein the ramp assist assembly directs deployment and retraction of the ramp plate. The link system is connected to the ramp fold arm and to the second ramp plate, wherein the link system includes a slide mechanism coupled to an underside of the second ramp plate. The slide mechanism maintains tension for the link system when deploying and retracting the ramp from the vehicle.