Dead man's switch
Device that reacts to the loss of the operator
Dead man's switch
A dead man's switch is a switch that is designed to be activated or deactivated if the human operator becomes incapacitated, such as through abandonment, drowsiness, loss of consciousness, death, or being bodily removed from control. Originally applied to switches on a vehicle or machine, it has since come to be used to describe other intangible uses, as in computer software. These switches are usually used as a form of fail-safe where they stop a machine with no operator from a potentially dangerous action or incapacitate a device as a result of accident, malfunction, or misuse. They are common in such applications as locomotives, aircraft refuelling, freight elevators, lawn mowers, tractors, personal watercraft, outboard motors, chainsaws, snowblowers, treadmills, snowmobiles, amusement rides, and many medical imaging devices. On some machines, these switches merely bring the machines back to a safe or safer state, such as reducing the throttle to idle or applying brakes while leaving...
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