Ammunition and explosive-charge making – Loading fireworks and bursting charges – Placing – tamping – or priming charge in blast hole
Patent
1992-06-11
1993-03-09
Eldred, J. Woodrow
Ammunition and explosive-charge making
Loading fireworks and bursting charges
Placing, tamping, or priming charge in blast hole
102313, 102319, 102323, 102324, 175 2, 299 13, F42B 300
Patent
active
051928191
ABSTRACT:
There is disclosed, according to the present invention, an apparatus and method for loading explosives exhibiting little water resistance into water filled blast holes without contamination of the explosives by water. A pressure charger vessel, capable of being filled with bulk explosives of low density and low water resistance, such as ammonium nitrate fuel oil, is connected to a flexible plastic sleeve. A pneumatic plug fixedly connects the lower portion of the pressure charger vessel to the plastic sleeve. The plastic sleeve is lowered into a blast hole by means of a weight. Compressed air is then introduced into the pressure charge vessel and a valve means located between the sleeve and the pressure charger vessel is opened, permitting pressurized ammonium nitrate fuel oil to be pushed downwardly into the flexible plastic sleeve. Projections and recesses on the outer surface of the plastic sleeve facilitate the expulsion of water from the blast hole.
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