Hospital Bed Motorized Wheel Mode Transition Control
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Solution Overview
Problem
Hospital beds with motorized movement systems pose safety concerns during handling, particularly in tight spaces and when transitioning from motorized to manual mode, and often require continuous battery power for movement, making it difficult for operators to make fine adjustments or switch modes effectively.
Innovation Solution
A bed control system incorporating a motorized wheel, processor unit, and controller with a touch sensor and ergonomic button layout allows for safe and practical handling in motorized, manual, and braking modes, enabling free wheel rotation and directional control with battery connection in multiple modes, and includes safety features like braking and battery status indicators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a motorized wheel system is implemented for bed propulsion, then ease of operation is improved, but safety risks increase due to unintended movement and difficulty in mode transitions
Solution Approach 1:
The control system dynamically transitions between motorized and manual modes based on operator input. The wheel automatically switches from motorized propulsion mode to manual free-rotation mode when the operator releases the push bar, enabling adaptive operation that maintains safety while preserving ease of use.
Solution Approach 2:
The push bar serves as an intermediary control element between the operator and the motorized wheel. It mediates the transition between modes: when pushed, it activates motorized movement; when released, it triggers automatic braking and mode switching to manual operation, thereby intermediating safety control without requiring separate switches.
2Ease of operation
If continuous battery power is required for motorized movement, then ease of operation is improved, but energy consumption increases
Solution Approach 1:
The motorized wheel operates periodically rather than continuously. The motor activates only during brief propulsion phases when the push bar is pressed, then disengages and allows free rotation during manual repositioning phases. This periodic operation pattern significantly reduces battery power consumption while maintaining operational ease.
Solution Approach 2:
The system provides self-service by automatically switching between motorized and manual modes based on operator input without requiring continuous power or manual intervention. Once the push bar is released, the wheel autonomously transitions to free-rotation mode, eliminating the need for continuous battery power during manual repositioning.
3Reliability
If mode switching requires separate switches or clutch mechanisms, then reliability is improved through safety control, but device complexity increases
Solution Approach 1:
The push bar performs multiple functions: it serves as both the activation mechanism for motorized movement and the control element for mode transitions. A single push bar integrates the functions of multiple separate switches or clutch mechanisms, reducing control system complexity while maintaining safety through automatic mode switching based on its pressed/released state.
Data Source
Figure 1
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Figure 4
AI summary
Bed (1) with system for propelling the bed (5) including motorized wheel (7), drive for propelling (37), processor unit (8) and control member. Using the controller (9) connected via the processor unit (8) to the drive for propelling (37) of the motorized wheel (7) it is possible to change the modes of the motorized wheel (7). In the first mode the movement of the motorized wheel (7) is dependent on the drive for propelling (37), whereas in the second mode the motorized wheel (7) rotates independently of the drive for propelling (37). Using the system for propelling the bed (5) it is thus possible to start the bed (1) moving in the selected direction, in manual mode or in braking mode.