Wheelchair Restraint Locking Sequence
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Solution Overview
Problem
Existing wheelchair restraint devices often restrict passenger movement and can lead to the wheelchair being forgotten to be bound, making the binding process inefficient.
Innovation Solution
A wheelchair-bound passenger restraint device featuring a wheelchair retractor, passenger retractor, buckle sensor, and electrically controlled passenger belt lock mechanism that ensures the wheelchair is bound before allowing passenger restraint, preventing the wheelchair from being forgotten and allowing smooth passenger movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the passenger is restrained before binding the wheelchair, then the passenger movement is restricted, but the operation becomes difficult and the wheelchair may be forgotten to be bound
Solution Approach 1:
The system performs preliminary action by automatically locking the passenger belt mechanism before the passenger is restrained. The control unit detects when the wheelchair belt is properly bound and preemptively locks the passenger belt, ensuring the wheelchair binding is completed first without requiring manual intervention or restricting passenger movement during the binding process
Solution Approach 2:
The system uses feedback from detection units that monitor the wheelchair binding state to control the passenger belt lock mechanism. When the detection unit confirms proper wheelchair binding, the control unit receives this feedback and automatically adjusts the passenger belt lock state, creating a closed-loop control system that prevents binding errors
2Reliability
If a mechanical lock mechanism is used for the passenger belt, then the structure becomes more complex, but the locking function is achieved
Solution Approach 1:
The system replaces the traditional mechanical lock mechanism with an electronic control system. The control unit receives signals from detection units and electronically controls the lock mechanism through solenoids or motors, eliminating complex mechanical linkages and reducing overall system complexity while maintaining reliable locking functionality
Solution Approach 2:
The control unit serves multiple functions: it detects the wheelchair binding state through detection units, controls the passenger belt lock mechanism, and coordinates the timing between wheelchair binding and passenger restraint. This multi-functional approach consolidates what would otherwise require separate mechanical systems into a single integrated control unit
Data Source
AI summary
A wheelchair-bound passenger restraint device has a wheelchair retractor that rewinds one end portion of a wheelchair belt member in an extractable manner, a wheelchair buckle that can be fitted with a wheelchair tongue plate, a passenger retractor that rewinds one end portion of a passenger belt member in an extractable manner, a passenger buckle that can be fitted with a passenger tongue plate, a buckle sensor that detects that the wheelchair tongue plate has been fitted to the wheelchair buckle, and a passenger belt lock mechanism that is configured to be able to make a changeover between a locked state making the passenger belt member unextractable an unlocked state making the passenger belt member extractable, and that makes a changeover from the locked state to the unlocked state when it is detected that the wheelchair tongue plate has been fitted to the wheelchair buckle.