Switching Assembly Interlock Device for Selector Switch Position Locking
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Solution Overview
Problem
Existing switching assemblies lack a reliable mechanism to lock a selector switch at a desired operational position, preventing accidental changes in settings.
Innovation Solution
An interlock device with a base member and a rotatable flapper member that constrains the selector switch's arm portion within an indented region, allowing the switch to be locked in a specific position using a spring and pin mechanism, and further secured by a locking device or seal wire.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a selector switch is made rotatable for operational flexibility, then the ease of operation is improved, but the reliability deteriorates due to accidental changes in settings
Solution Approach 1:
The flapper member is designed to be rotatable relative to the base member, transitioning between a first position (allowing rotation) and a second position (constraining rotation). This dynamic mechanism allows the system to switch between operational flexibility and positional stability as needed.
Solution Approach 2:
The flapper member acts as an intermediary between the user and the selector switch. When in the second position, it physically blocks the arm portion from rotating outside the indented region, serving as a mediator that prevents accidental changes while preserving the switch's rotational capability when needed.
2Reliability
If a locking mechanism is added to secure the selector switch position, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The interlock device is segmented into distinct functional components: a base member with mounting aperture, a rotatable flapper member with indented region, and a spring-loaded pin mechanism. This segmentation allows each component to perform its specific function while keeping the overall structure manageable and maintainable.
Solution Approach 2:
The spring-loaded pin automatically engages with the flapper member to maintain it in the second (locked) position. The spring provides continuous force to keep the pin engaged, and the system self-regulates without requiring external power or complex control mechanisms, thereby reducing overall device complexity.
Data Source
Figure 1
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AI summary
A switching assembly having an interlock device (30) for a selector switch (40) is provided. The interlock device (30) includes a flapper member (74) rotatably coupled to a base member (70). The flapper member (74) has an aperture (164) disposed proximate to an aperture (22) of a panel (20) such that the selector switch (40) extends through the apertures (164, 22). The flapper member (74) further includes an indented region (170) and has a first operational position proximate to the panel (20) and a second operational position disposed outwardly from the panel (20). When an arm portion (224) of the selector switch (40) is disposed within the indented region (170) of the flapper member (74) at the second rotational position and the flapper member (74) is rotated to the second operational position, then the arm portion (224) cannot be rotated outside of the indented region (170).