F - Mech Eng,Light,Heat,Weapons – 42 – D
Patent
F - Mech Eng,Light,Heat,Weapons
42
D
86/5.1
F42D 99/00 (2009.01) E21B 43/08 (2006.01)
Patent
CA 1106661
ABSTRACT The invention relates to a blast hole liner of the type used for lining blast holes in the mining industry. The liner has a pocket arrange- ment 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 mater- ial. The weighted pocket provides the liner with a generally rounded, bullet-shaped lower end. As the liner is lowered into a blast hole, the point- edness 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.
329450
Borden Ladner Gervais Llp
Mesabi Jobbers Inc.
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