Ammunition and explosives – Blasting – Borehole loading
Patent
1981-06-11
1985-05-28
Nelson, Peter A.
Ammunition and explosives
Blasting
Borehole loading
102312, 1022022, 1022029, 102206, 86 20C, F42B 300
Patent
active
045193142
ABSTRACT:
A method of charging a borehole with a column of explosives is described wherein the explosive charge is detonable in time-delay sequence by means of electrically initiated detonators. The method requires providing a loop of an insulated electrical conductor throughout the length of the borehole and, as the borehole is charged with explosives, sliding electrically actuable time-delay detonators along the wire so as to be positioned at intervals throughout the borehole. The detonators are electrically coupled to the looped wire by means of slidable toroidal transformer cores. The wire loop, in turn, is electromagnetically energized by means of a second transformer core and an energy source. The method provides for safe and efficient borehole charging and avoids the hazards associated with usual electric detonator systems.
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patent: 3018733 (1962-01-01), Johnson
patent: 3091177 (1963-05-01), Grebe
patent: 3133231 (1964-05-01), Fail et al.
patent: 3148619 (1964-09-01), Holinbeck
patent: 3987729 (1976-10-01), Andrews et al.
patent: 4133247 (1979-01-01), Calder, Jr. et al.
patent: 4145968 (1979-03-01), Klein
patent: 4297947 (1981-11-01), Jones et al.
Ballantyne Donald G.
C-I-L Inc.
Nelson Peter A.
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