Remote Reset Actuator for Rail-Mounted Lift Emergency Stop
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Solution Overview
Problem
Existing rail-mounted lift systems require manual and often inconvenient access to reset the lift unit after activating an emergency stop, as users need to reach the lift motor, which can be difficult due to its elevated position, especially when electrical controls are unresponsive.
Innovation Solution
A rail-mounted lift system with a reset actuator communicatively coupled to user interface devices, allowing for remote reset of the lift unit without direct contact, eliminating the need for ladder access or removing the unit from the overhead rail.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lift motor is positioned high on the overhead rail for proper lifting function, then the lifting capability is improved, but the accessibility for manual reset becomes difficult
Solution Approach 1:
A reset actuator is introduced as an intermediary device that can be operated from ground level to reset the emergency stop condition. The actuator communicates with the control system to restore power to the motor without requiring physical access to the elevated motor location, thus resolving the contradiction between reliable emergency stopping and easy reset accessibility
Solution Approach 2:
The manual mechanical reset process (requiring physical access to the motor) is replaced with an automated electronic reset system. The reset actuator sends electronic signals to the control system to restore power, substituting the mechanical access requirement with an electronic control mechanism that can be operated remotely
2Ease of operation
If the reset actuator is added to enable remote resetting, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The control system is designed to serve multiple functions: it controls the motor operation, processes emergency stop signals, and handles reset actuator commands. By making the control system multi-functional, the patent avoids adding a completely separate reset mechanism, thereby reducing the increase in device complexity while still improving ease of operation
Data Source
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AI summary
A switch assembly for a lift unit includes a switch, an emergency stop device, and a reset actuator. The switch is arranged to move between a closed position, wherein the switch electrically couples a lift motor of the lift unit to an energy source, and an open position, wherein the switch electrically decouples the lift motor from the energy source. The emergency stop device is coupled to the switch and arranged to move the switch from the closed position to the open position. The reset actuator is coupled to the switch and arranged to move the switch from the open position to the closed position, wherein the reset actuator is controllable to move the switch from the open position to the closed position.