Device for warning of impending roof-fall in underground excavat

Details Device for warning of impending roof-fall in underground excavat Device for warning of impending roof-fall in underground excavat

1979-11-21

1981-11-10

Goldberg, Gerald

Signals and indicators

Indicators

Visual light signal

116DIG34, 116212, G01L 124

Patent

active

042991854

ABSTRACT:
Apparatus for activation of a chemical lightstick by downward sag of a mine roof is described. Through a spool and collar at the mine roof, two wires are extended from an anchor set in a stable formation above the roof, and are tied to a lightstick below the collar and spool. Pathways for passage of the two wires through the spool are provided so the wires are outside a center opening in the spool but are inside the outermost diameter of the neck of the spool. A spring-loaded embodiment permits the apparatus to tolerate a measured sag without activating the lightstick.

REFERENCES:
patent: 3764796 (1973-10-01), Gilliam
patent: 3844248 (1974-10-01), Parker
patent: 3987668 (1976-10-01), Popenoe
Engineering/Mining Journal, Aug. 1978, pp. 72 and 73, by Jack Parker.

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