Two-Point Wheelchair Securement With Barrier-Guided Stability
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Solution Overview
Problem
Current wheelchair securement systems in vehicles are cumbersome and time-consuming, particularly in public transit, due to their reliance on a 4-point attachment system that does not efficiently comply with ADA safety standards during normal operation and crash events.
Innovation Solution
A two-point wheelchair securement system using a forward-facing barrier and a side module, with integrated restraints and a cushion or bumper, that allows for faster securement and stability by utilizing two vehicle attachment points and two wheelchair attachment points, optionally incorporating a tensioning mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a 4-point attachment system is used to secure the wheelchair, then the wheelchair stability and safety are improved, but the securement time and operational complexity increase
Solution Approach 1:
The patent extracts and eliminates two of the four attachment points required by traditional systems, reducing the securement process to only two essential points. The front restraint attaches to the front of the wheelchair and the rear restraint attaches to the rear, removing the need for side attachments while maintaining adequate stability through strategic positioning and tensioning mechanisms.
Solution Approach 2:
The securement system is segmented into two independent restraint units (front and rear) rather than a unified four-point system. Each restraint unit includes its own attachment mechanism, strap, and tensioning device, allowing for simplified individual operation and faster securement without requiring coordination of multiple attachment points.
2Reliability
If a 4-point attachment system is used to secure the wheelchair, then the wheelchair stability and safety are improved, but the system complexity and ease of operation deteriorate
Solution Approach 1:
The patent removes two attachment points from the traditional four-point system, eliminating the complexity of attaching and detaching restraints at the sides of the wheelchair. The simplified two-point system requires fewer操作步骤 and less dexterity, making it easier for operators to use quickly and correctly.
Solution Approach 2:
The restraint system incorporates dynamic tensioning mechanisms that automatically adjust and maintain optimal restraint force. This eliminates the need for manual adjustment and ensures consistent performance, simplifying operation while maintaining reliability.
3Productivity
If a two-point attachment system is used to secure the wheelchair, then the securement time and operational simplicity are improved, but the number of attachment points and potential stability are reduced
Solution Approach 1:
The restraint system is pre-configured with attachment points positioned to optimize stability with minimal attachments. The front and rear attachment points are strategically located to maximize leverage and minimize wheelchair movement, achieving adequate stability with only two points rather than requiring all four traditional points.
Solution Approach 2:
The restraint straps and tensioning mechanisms are designed with curved geometries that conform to the wheelchair structure, distributing forces more effectively across the wheelchair frame. This enhances stability despite the reduced number of attachment points.
4Ease of manufacture
If a two-point attachment system is used to secure the wheelchair, then the installation complexity and cost are reduced, but the system complexity reduction must not compromise safety standards
Solution Approach 1:
The patent eliminates two attachment points and associated hardware from the traditional four-point system, reducing installation complexity and cost. Fewer attachment points mean fewer holes to drill, fewer bolts to install, and simpler integration into the vehicle structure, while still meeting safety requirements through optimized restraint positioning and tensioning.
Data Source
AI summary
The embodiments described and claimed herein are improved wheelchair passenger securement systems and stations. In particular, one embodiment described and claimed herein is a drop-in system comprising a barrier module and a wall-side module, which incorporate two separate restraint devices which are configured to secure a wheelchair at two separate attachment points and a bumper. The system can optionally include a moveable excursion barrier or a pull-mechanism to pre-tension at least one of the restraint devices the wheelchair securements. In a simpler embodiment, a bumper and two restraint devices, such as retractors, are provided for attachment to the vehicle surfaces or structures at a wall side of a wheelchair securement area or at a rear side of the wheelchair securement area.