Ammunition and explosives – Blasting – Contained blasting charge
Patent
1996-12-18
1998-08-25
Nelson, Peter A.
Ammunition and explosives
Blasting
Contained blasting charge
102312, 102313, 102323, 102324, 102331, 102332, 102302, F42B 300, F42D 300
Patent
active
057984778
ABSTRACT:
The present invention includes a small diameter explosive cartridge and a two-stage large diameter explosive cartridge apparatus for presplitting rock can be axially detonated by detonating cord through a central detonation passageway in the explosive cartridge while keeping the detonating cord and the explosive material in the explosive cartridge physically separate. The explosive cartridge includes an outer tube and an inner tube inside of the outer tube. The explosive cartridge includes two or more continuous webs extending radially between the outer surface of the inner tube and the inner surface of the outer tube. For the small diameter explosive cartridge, the space between the outer surface of the inner tube and the inner surface of the outer tube is filled with high explosive material such as water gel or emulsion explosive material. The inside of the inner tube forms a central detonation passageway axially through the small diameter explosive cartridge through which detonating cord can be strung to provide axial detonation and to provide effective detonation between each of the small diameter explosive cartridges when the small diameter explosive cartridges are assembled on a line of detonating cord in a borehole, while keeping the detonating cord and the emulsion explosive material in the small diameter explosive cartridge physically separate. The two-stage large diameter explosive cartridge apparatus includes a large diameter explosive cartridge and a small diameter explosive cartridge.
REFERENCES:
patent: 3604353 (1971-09-01), Newman
patent: 3604354 (1971-09-01), Brown et al.
patent: 4334476 (1982-06-01), Day et al.
patent: 4961381 (1990-10-01), McLaughlin
patent: 4987818 (1991-01-01), Alford
patent: 5259316 (1993-11-01), Nelson et al.
patent: 5435250 (1995-07-01), Pollock
Givens Richard W.
Williams Greg S.
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