Blasting device for unblocking mine raises

Details Blasting device for unblocking mine raises Blasting device for unblocking mine raises

1991-03-11

1991-12-03

Brown, David H.

Ammunition and explosive-charge making

Loading fireworks and bursting charges

Placing, tamping, or priming charge in blast hole

89 134, 299 13, F42D 304, F42B 300

Patent

active

050691082

ABSTRACT:
A blasting device for unblocking ore passes, backfill raises, mine draw points and any other near vertical raises where rocks or other materials normally fall freely but may get blocked during use, comprises a propulsion unit including an air chamber mounted at the end of a hollow tube and having an inlet for receiving pressurized air and at least one outlet for allowing compressed air jets to exit downwardly from the air chamber to propel the propulsion unit upwardly, a reservoir mounted on the propulsion unit and adapted to hold explosive and an igniter, means for feeding pressurized air into the air chamber through the hollow tube, and an ignition line connected to the igniter for igniting the explosive from a distance.

REFERENCES:
patent: 2818809 (1958-01-01), Roy
patent: 3541797 (1970-11-01), Stewart
patent: 3770523 (1973-11-01), Biswas
patent: 4036099 (1977-07-01), French
patent: 4040329 (1977-08-01), Ljungberg
patent: 4522125 (1985-06-01), Marz
patent: 5007345 (1991-04-01), Garr

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