F - Mech Eng,Light,Heat,Weapons – 42 – D
Patent
F - Mech Eng,Light,Heat,Weapons
42
D
102/9
F42D 3/04 (2006.01) F42D 1/00 (2006.01) F42D 3/00 (2006.01)
Patent
CA 1055308
A B S T R A C T A method and device for the directional blasting of rock and other materials is provided. A blasting tube, the cross-sectional shape of which is crescent shaped, has a substantially rigid elongated body with a longi- tudinal air space therein and means to separate an explosive charge from the air space. Preferably, the separating means consists of a concave portion of the wall of the tube and the cross section of the air space is also crescent shaped. After the bore hole is drilled, the tube and the explo- sive material is inserted into the bore hole with the air cushion provided by the tube being oriented in the hole between the explosive charge and one side of the bore hole in a direction relative to the explosive charge op- posite to which the maximum breaking and shattering forces are desired. The explosive charge can then be detonated without the use of stemming mater- ial other than the usual material to plug the outer end of the bore hole. When the explosive charge consists of individual elements of cylindrical form, the charge can be attached to the blasting tube prior to insertion thereof into the hole. The concave exterior portion of the tube is then adapted to hold the cylindrical charge.
220848
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