Blast hole liner

Details Blast hole liner Blast hole liner

1977-06-10

1980-01-08

Pendegrass, Verlin R.

Ammunition and explosives

Igniting devices and systems

102 24R, F42B 300

Patent

active

041822420

ABSTRACT:
The invention relates to a flat storable blast hole liner of the type used for lining blast holes in the mining industry. The liner has a pocket arrangement at its lower end for holding weighting material, the weighted pocket facilitating insertion of the liner, when empty of explosive, into a blast hole. The pocket arrangement comprises two pockets at the bottom of the liner and on opposite sides thereof, either of which may be filled with weighting material. The weighted pocket provides the liner with a generally rounded, bullet-shaped lower end. As the liner is lowered into a blast hole, the pointedness of the lower end tends to center the liner in the hole. Upon reaching the bottom of the hole the weighted pocket sags to one side of the hole and thereby allows later added explosive material to be received at the very bottom of the hole.

REFERENCES:
patent: 3760727 (1973-09-01), Callister et al.
patent: 3881417 (1973-11-01), Mesia
patent: 4019438 (1977-04-01), Swanson

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