System for protecting persons underground from dangerous areas
AssigneeBergwerksverband GmbH
InventorsKarl Rosgen, Klaus Noack
Life of this patent
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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.
Claims17
A system for protecting persons engaged in underground operations from danger areas, comprising in combination a plurality of miner's head lamps;
- a plurality of continuously operating signal transmitters each connected to a respective one of said miner's head lamps in such a manner that when the head lamps are worn the signal transmitters must be carried along by the wearers;
- signal reception means positioned at a danger area and responsive to signals transmitted by said signal transmitters;
- means for establishing a definite zone within which a transmitter must be located to be detected by said reception means;
- and electric means for automatically initiating a safeguarding operation when a respective one of said transmitters enters said zone.
Dependencies are inferred from the claim text.