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johnmperry commented on the word dead man's handle
A device intended to stop a machine in case the human operator becomes incapacitated, commonly used in locomotives and dangerous machinery.
Typically, the controller handle is a horizontal bar, rotated to apply the required power. Attached to the bottom of the handle is a rod which, when pushed down, contacts a solenoid or switch inside the control housing. The handle springs up if pressure is removed, releasing the rod's contact with the internal switch, instantly cutting power and applying the brakes.
June 20, 2008