Radio-controlled machine power cut-off
First Claim
1. A radio-controlled machine power safety cut-off comprisinga pair of battery-powered radio transmitters adapted for individual wear on the wrists of the machine operator,a first radio receiver means having its antenna disposed at a danger zone of said machine responsive to the predetermined magnitude of a broadcast signal emitted by either or both of said radio transmitters signalling intrusion of said radio transmitters closer than a preselected safe distance, said first radio receiver being provided with associated switching means cutting off the operating power of said machine, upon occurrence of said intrusion, anda second radio receiver means having its antenna disposed adjacent said machine responsive to the broadcast signals of said pair of radio transmitters, said second radio receiver being provided with associated switching means cutting off the operating power to said machine whenever either or both of said radio transmitters fails to emit said broadcast signals.
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Accused Products
Abstract
A pair of battery-powered radio transmitters are individually worn on the wrists of a machine operator, and two radio receivers are tuned to receive the signals broadcast by the radio transmitters, the first radio receiver being a proximity-sensitive device switching off the driving power to the machine whenever either radio transmitter comes within a preselected safe distance limit from the work-accomplishing region of the machine whereas the second radio receiver is a radio transmitter operating state-verifying device switching off the driving power to the machine whenever either or both of the radio transmitters fails to transmit its characteristic broadcast signal.
42 Citations
6 Claims
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1. A radio-controlled machine power safety cut-off comprising
a pair of battery-powered radio transmitters adapted for individual wear on the wrists of the machine operator, a first radio receiver means having its antenna disposed at a danger zone of said machine responsive to the predetermined magnitude of a broadcast signal emitted by either or both of said radio transmitters signalling intrusion of said radio transmitters closer than a preselected safe distance, said first radio receiver being provided with associated switching means cutting off the operating power of said machine, upon occurrence of said intrusion, and a second radio receiver means having its antenna disposed adjacent said machine responsive to the broadcast signals of said pair of radio transmitters, said second radio receiver being provided with associated switching means cutting off the operating power to said machine whenever either or both of said radio transmitters fails to emit said broadcast signals.
Specification