Carrier for explosive primer and method of using same

Ammunition and explosives – Blasting – Borehole loading

Patent

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Details

1022753, 1022757, F42B 310

Patent

active

RE0306215

ABSTRACT:
A method of charging a borehole with at least first and second separate sections of explosive material, which method comprises the steps of providing a detonating cord extending into the borehole, providing a first primer on a first carrier having a time delay connection between the cord and the first primer, this time delay having a first selected value, providing a second primer on a second carrier having a time delay connection between a cord and the second primer, the time delay of the second carrier having a second selected value different from the first selected value, sliding the first carrier and primer along the cord and into detonation association with the first section of explosive material and sliding the second carrier and primer along the same cord to detonation association with the second section of explosive material. Also the carrier for use in a method as described above which carrier includes means for holding the primer, means for slidably securing the carrier with respect to the detonating cord whereby the carrier can move freely and longitudinally along the cord, and means for supporting on the carrier an elongation detonation element extending in a generally linear path from the extending cord to the primer thereon.

REFERENCES:
patent: 2707439 (1955-05-01), Hamilton
patent: 3256814 (1966-06-01), Kruppenbach et al.
patent: 3288065 (1966-11-01), Tousley
patent: 3343487 (1967-09-01), Hare et al.
patent: 3431851 (1969-03-01), Kern et al.
patent: 3683809 (1972-08-01), Burkle
patent: 3709149 (1973-01-01), Driscoll
patent: 3713384 (1973-01-01), Turnbull
patent: 3981240 (1976-09-01), Gladden
patent: 3987732 (1976-10-01), Spraggs et al.
patent: 3987733 (1976-10-01), Spraggs et al.
patent: 4060033 (1977-11-01), Postupack et al.
patent: 4060034 (1977-11-01), Bowman et al.

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