Coal mine shooting plug

Details Coal mine shooting plug Coal mine shooting plug

1974-05-03

1976-05-04

Pendegrass, Verlin R.

Ammunition and explosives

Igniting devices and systems

F42B 320

Patent

active

039540588

ABSTRACT:
A recoverable plug for the blasting hole of a mine. A steel ball is enclosed within one hollowed-out portion of the plug, and sealed therein, so that the plug may be magnetically recovered after the blasting has been completed; or later, when the mined material is treated with a fluid such as water. The hollowed-out portion is further charged with compressed air, or similar fluid, to assist in absorbing the shock when the blast occurs, with the hollowed-out-portion also making the plug bouyant when it passes through a washing or similar liquid. Suitable expansion means is provided to "seat" the plug in a blasting hole.

REFERENCES:
patent: 971264 (1910-09-01), Goodrow et al.
patent: 2296504 (1942-09-01), Crater
patent: 2388232 (1945-10-01), Tappan
patent: 3264992 (1966-08-01), Beck

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