Mine roof warning indicator

Details Mine roof warning indicator Mine roof warning indicator

1978-12-21

1980-08-19

Yasich, Daniel M.

Signals and indicators

Indicators

Stress type

73761, 73784, F16B 3102, G01L 500

Patent

active

042178495

ABSTRACT:
A mine warning device which comprises tensioned arms that abut the roof of an underground mine. The arms support a cone shaped shaft which is attached to a warning indicator. The indicator remains invisible within the body of the device when the rocks forming the roof are stable. Upon a shifting of the mine roof, which applies pressure to the arms of the device, the shaft is released and the warning cylinder falls into view. Preferably, the device attaches to bolts that hold plates to the mine roof and the warning indicator is fluorescent.

REFERENCES:
patent: 2362872 (1944-11-01), Weagle
patent: 2725843 (1955-12-01), Koshi
patent: 3111655 (1963-11-01), Kotarsky et al.
patent: 3133468 (1964-05-01), Cumming
patent: 3137268 (1964-06-01), Hornwood
patent: 3179082 (1965-04-01), McClean
patent: 3329058 (1967-07-01), Cumming
patent: 3786503 (1974-01-01), Webb et al.
patent: 3844248 (1974-10-01), Parker
patent: 4000681 (1977-01-01), Coldren
patent: 4041776 (1977-08-01), Payne

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