Cable-Operated Mechanical Defeater for Explosion-Proof Enclosures
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Solution Overview
Problem
Existing mechanical safety interlock systems for explosion-proof electrical enclosures do not adequately ensure that the primary door latch or handle is fully engaged before the electrical disconnect is activated, posing a safety risk.
Innovation Solution
A cable-operated mechanical defeater system comprising a rod assembly with extension springs, a cam lever assembly, and an adjustable hook mechanism that requires the door latch to be fully engaged before allowing electrical disconnect operation, ensuring a secure interlock.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cable-operated mechanical defeater system is added to ensure door latch engagement, then safety is enhanced, but device complexity increases
Solution Approach 1:
The patent replaces complex electrical sensing and control systems with a purely mechanical cable-operated defeater mechanism. This mechanical approach uses physical linkage through cables, levers, and cam followers to achieve the safety function, eliminating the need for sensors, actuators, and electrical control logic.
Solution Approach 2:
The cable acts as a simple mechanical intermediary that transmits force and motion from the door latch to the defeater mechanism. This passive mechanical transmission is simpler than active electrical sensing systems while reliably ensuring the latch is engaged before disconnect activation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances safety by ensuring the door latch is fully engaged before electrical disconnect, preventing accidental disengagement and enhancing the mechanical safety interlock functionality.
Implementation Method 1
The rod assembly comprises a first rod guide, wherein the rod guide comprises a flat plate having a first edge. The first edge contains a top perpendicular tab with a centered opening, a middle perpendicular tab with a centered opening, and a bottom perpendicular tab with a centered opening. There is a top rod, the top rod comprising a first L-shape, with the foot of the first L-shape perpendicular to the flat plate. The top rod has a top end and a bottom end. There is a top extension spring; the top extension spring is attached by a first end to the top of the top rod, the opposite end of the top extension spring is releasably attached to the top perpendicular tab.
Data Source
AI summary
This invention deals with a cable operated mechanical defeater. The purpose of the device is to add an additional level of safety that requires the primary door latch or handle to close and engage before the electrical disconnect is turned on.