Radio-controlled machine power cut-off

Details Radio-controlled machine power cut-off Radio-controlled machine power cut-off

1976-03-30

1977-11-08

Swann, III, Glen R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

192129A, 325 37, 325118, 340147MT, 340267R, 340279, H04B 700

Patent

active

040578054

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.

REFERENCES:
patent: 2913581 (1959-11-01), Simonton et al.
patent: 2963627 (1960-12-01), Buchsbaum
patent: 3950755 (1976-04-01), Westbrook, Sr.

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