Short range trapped miner locator

Details Short range trapped miner locator Short range trapped miner locator

1983-03-08

1985-01-01

Ng, Jin F.

Telecommunications

Transmitter

Mobile or portable

455127, 340539, 340636, 340663, H04B 1034

Patent

active

044919719

ABSTRACT:
A short range, low power, radio wave transmitter which acts as a miner locator. The transmitter is incorporated with the cap lamp circuitry for the miner. It utilizes the same self-contained power source and its wire connection thereto acts as the transmitter's antenna. No action on the miner's part is necessary in order to begin the transmission which may be on a specific identifying frequency for each miner. An electronic crowbar circuit may be used to conserve power for the transmitter by cutting off power to the cap lamp should the voltage across the self-contained power source fall below a preset level. This enables the transmitter to function for several days by reducing the load on the power source.

REFERENCES:
patent: 2535063 (1950-12-01), Halstead
patent: 3087117 (1963-04-01), Mitchell
patent: 3181135 (1965-04-01), Zoglio
patent: 3315263 (1967-04-01), Lefevre
patent: 3750023 (1973-07-01), Weissenborn et al.
patent: 3806936 (1974-04-01), Koster
patent: 4296408 (1981-10-01), Neuringer
"A Short-Range Locator System for Detecting Trapped Miners", by Webb et al., Bureau of Miners Report of Investigations/1984.

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