Mechanical Interlock for Switchgear Position Locking
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Solution Overview
Problem
Existing switchgear systems lack an effective means to physically prevent the switch from moving between positions, relying on covers that only restrict user interface manipulation rather than preventing switch movement.
Innovation Solution
A mechanical interlock system comprising a base and a slider with locking mechanisms, including shackle and deadbolt apertures, that engages with the switch's mechanical linkage to lock the switch in place, using a padlock or deadbolt for secure locking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a cover is provided over the user interface to prevent manipulation, then the user interface manipulation is prevented, but the switch can still move between positions physically
Solution Approach 1:
The interlock device is divided into separate functional components: a base mounted on the switchgear, a movable slider with locking finger, and external locking mechanisms (padlock/shackle or deadbolt). This segmentation allows the cover to prevent interface manipulation while the slider independently provides physical switch position stabilization through its locking finger engagement with the mechanical linkage.
Solution Approach 2:
The slider acts as an intermediary component between the switch mechanical linkage and the external locking mechanisms. The locking finger on the slider engages with the mechanical linkage to prevent switch movement, while the shackle receiving hole or deadbolt apertures provide interfaces for external locks. This intermediary structure bridges the gap between interface protection and physical position stabilization.
2Reliability
If the locking finger engages with mechanical linkage to lock switch position, then the switch position is stabilized, but the device complexity increases
Solution Approach 1:
The slider component performs multiple functions: it provides the locking finger that engages with mechanical linkage to stabilize switch position, contains the shackle receiving hole or deadbolt apertures for external locking, and moves between positions to enable or disable locking. This multi-functionality reduces overall device complexity by consolidating multiple features into a single component rather than requiring separate mechanisms for each function.
Solution Approach 2:
The slider is movable relative to the base, allowing it to automatically position itself to engage or disengage the locking finger with the mechanical linkage based on switch position. This self-positioning capability reduces the need for complex control mechanisms, as the slider serves itself to enable or disable locking functionality based on the operational state of the switch.
Data Source
AI summary
A mechanical interlock for a switch gear switch. The mechanical interlock includes a base and a slider. The slider is moveable relative to the base between a first position and a second position. The mechanical interlock is configured to lock the position of the switch when the slider is in the second position.