Arc Resistant Electrical Enclosure Latch Mechanism
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Solution Overview
Problem
Current electrical enclosure latching mechanisms hinder access to components while attempting to allow the escape of hot gases during malfunctions, encumbering both access and gas release.
Innovation Solution
A movable latch mechanism that can be extended to secure the door and retracted for full access, designed to resist opening during faults while permitting gas escape, comprising a latch plate assembly with a pivotable design and biasing elements to manage pressure and facilitate gas venting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a latch mechanism is provided to secure the door, then door security is improved, but access to components is encumbered
Solution Approach 1:
The latch plate is designed to be movable between an extended position (providing full access to components) and a retracted position (securing the door). This dynamic positioning allows the same component to serve different functions at different times, resolving the contradiction between door security and component accessibility.
2Strength
If the latch mechanism is made solid to resist opening during faults, then enclosure integrity is improved, but gas escape is hindered
Solution Approach 1:
The latch mechanism is segmented into a fixed latch body and a movable latch plate. The fixed body provides structural strength to resist fault conditions, while the movable plate can be displaced to create gas escape paths. This segmentation allows the system to simultaneously achieve both enclosure integrity and gas venting capability.
Solution Approach 2:
The position parameter of the latch plate is changed during fault conditions. The latch plate can move from its normal secured position to a displaced position that creates gaps for gas escape, while the overall latch structure maintains its strength to contain the fault. This parameter change allows the system to adapt to different operational states.
Data Source
AI summary
A latch device is provided for an electrical enclosure. The latch device includes a latch plate which is movable between extended and retracted positions. In the extended position, the latch plate allows a door to be secured over an opening in the enclosure. In the retracted position, the latch plate permits unencumbered access to components and mounting structures within the enclosure, such as for removal of a mounting unit. The latching mechanism may bias the enclosure door to a closed position, while permitting movement of the door, without unlatching of the mechanism, during fault conditions within the enclosure, such as to permit the escape of hot gasses.