System for protecting persons underground from dangerous areas

Details System for protecting persons underground from dangerous areas System for protecting persons underground from dangerous areas

1971-05-20

1976-03-30

Habecker, Thomas B.

Communications: electrical

Systems

Call station

325118, 325 37, G08B 108

Patent

active

039478327

ABSTRACT:
Each person underground in the mine carries in his helmet lamp a continuously operating transmitter the signal of which is detected by a receiver. The receiver or the antenna thereof is installed, in one embodiment, in a Faraday cage that surrounds the dangerous area, such as the feed side of the crushing machine or the delivery end of a conveyor. In another embodiment, directional antennas are located at the approaches to a blasting area, for example. In either case, when a signal is detected indicating the presence of a person in the danger zone, in the case of the Faraday cage, or near the danger zone, the conveyor is stopped or a warning is sounded, as the case may be.

REFERENCES:
patent: 3183443 (1965-05-01), Lefevre
patent: 3225265 (1965-12-01), Krause et al.
patent: 3309690 (1967-03-01), Moffitt
patent: 3315263 (1967-04-01), Lefevre
patent: 3348226 (1967-10-01), Fischer
patent: 3582931 (1971-06-01), Nawrocki

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