Ammunition and explosives – Igniting devices and systems
Patent
1977-01-11
1978-05-23
Pendegrass, Verlin R.
Ammunition and explosives
Igniting devices and systems
102 24R, 86 20C, F42D 102
Patent
active
040904474
ABSTRACT:
A method and device for the directional blasting of rock and other materials. A blasting tube, the cross-sectional shape of which is crescent shaped, has a substantially rigid elongated body with a longitudinal air space therein and a wall to separate an explosive charge from the air space. Preferably, the wall is concave and the cross section of the air space is also crescent shaped. After the bore hole is drilled, the tube and the explosive 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 opposite to which the maximum breaking and shattering forces are desired. The explosive charge can then be detonated without the use of stemming material 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.
REFERENCES:
patent: 337492 (1886-03-01), Hadesty
patent: 2903969 (1959-09-01), Kolbe
patent: 3099216 (1963-07-01), Jakobsen et al.
patent: 3349705 (1967-10-01), Wilson
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