Stair Chair Handle Control Logic for One-Handed Operation
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Solution Overview
Problem
Conventional stair chairs for patient transport are difficult for caregivers to operate safely and efficiently, particularly when traversing stairs, as they require one hand to support the chair and another to manipulate controls, posing challenges in mobility and safety.
Innovation Solution
A patient transport apparatus with a track assembly and handle system that allows caregivers to easily transition between floor and stair configurations, featuring a deployment lock mechanism, folding lock mechanism, and a control system with a user interface for safe and controlled movement, enabling one-handed operation while supporting the patient.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional stair chairs are used with powered tracks, then patient transport capability is provided, but control operation becomes difficult requiring two hands
Solution Approach 1:
The control input is merged with the support handle, allowing the caregiver to operate controls while supporting the stair chair with the same hand. The handle assembly includes both the support function and the control input mechanism integrated together.
Solution Approach 2:
The handle assembly serves multiple functions: supporting the stair chair, providing control input, and enabling operation with one hand. This multi-functional design eliminates the need for separate control mechanisms that would require additional hands.
2Reliability
If one hand supports the stair chair and the other manipulates controls, then powered track control is possible, but caregiver mobility and safety are reduced
Solution Approach 1:
The control input mechanism is combined with the support handle, enabling the caregiver to maintain a secure grip on the stair chair while simultaneously operating the powered tracks. This integration improves safety by keeping both support and control functions within reach of one hand.
3Adaptability or versatility
If conventional controls are used, then powered track functionality is achieved, but transition between floor and stair configurations becomes difficult
Solution Approach 1:
The handle assembly is designed to be movable and adjustable, allowing it to adapt to different configurations (floor transport vs. stair transport). The dynamic design enables easy repositioning and operation during configuration transitions.
Solution Approach 2:
The handle assembly serves as a universal control mechanism that works in both floor and stair configurations, eliminating the need for separate control systems for different modes of operation.
Data Source
AI summary
A patient transport apparatus operable by a user for transporting a patient along stairs. A seat section is coupled to a support structure supporting a track assembly having a belt. A motor selectively generates torque to drive the belt. A user interface is arranged for engagement by the user, and has a direction input control for selecting a drive direction of the motor, and an activation input control for operating the motor to drive the belt. A controller in communication with the motor and the user interface is configured to limit operation of the motor in response to user engagement of the activation input control preceding engagement of the direction input control to prevent driving the belt, and to permit operation of the motor in response to user engagement of the activation input control following engagement of the direction input control to drive the belt in a selected drive direction.