Electric Switch Rotor Housing Position Indicator
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Solution Overview
Problem
Existing electrical switches lack a reliable mechanism for safe handling and visualization of the switch's position, particularly in scenarios where contacts are fused due to overcurrent, making it difficult to determine the safe state of the switch.
Innovation Solution
A switch with a display element directly or indirectly coupled to the rotor housing that indicates the on and off positions independently of the contact arm's position, using a deflection element to adjust the display based on the rotor housing's rotation, ensuring the switch is in a safe state by visualizing its position and preventing misinterpretation due to fused contacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the switch uses a handle coupled to the rotor housing to indicate position, then the switch provides a simple mechanical indication, but the indication becomes unreliable when contacts are fused due to overcurrent
Solution Approach 1:
The indication mechanism is segmented into two independent parts: a handle coupled to the contact arm and a display element coupled to the rotor housing. This segmentation allows the display element to independently indicate the rotor housing position regardless of contact arm position, providing reliable indication even when contacts are fused
Solution Approach 2:
A deflection element acts as an intermediary between the rotor housing and the display element. When the rotor housing rotates, the deflection element translates this motion to adjust the display element's position, creating a reliable mechanical linkage that directly reflects the rotor housing position without being affected by contact arm status
2Reliability
If the switch provides visual indication of rotor housing position, then safe handling is enabled, but the device structure becomes more complex
Solution Approach 1:
The display element is integrated into the switch housing structure, and the deflection element utilizes the existing rotational space around the rotor housing. This merging approach adds safety functionality while minimizing structural complexity by utilizing existing spatial relationships rather than adding separate independent mechanisms
Data Source
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AI summary
The switch has a rotor housing (20) turned to an ON position and an OFF position. Two electric contact arms (50, 51) are rotatably mounted in the rotor housing and jointly swivable with the rotor housing. A display element is indirectly or directly coupled to the rotor housing to indicate the ON position of the rotor housing in a display position and to indicate the OFF position of the rotor housing in another display position. A control element e.g. control disk, is turned together with rotation of the rotor housing. The control disk is designed as a cam disk.