Delay initiator for blasting
AssigneeICI Canada Inc.
InventorsDonald C. True, Raymond Carriere
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Abstract
A novel initiator (blasting cap) for explosives is provided. The initiator, which may be electric or non-electric, comprises a principal tubular metal shell containing a base charge, a delay charge, a priming charge and an ignition means, wherein the base charge and priming charge are housed within a reduced diameter tubular metal shell, which reduced diameter shell is located within but separated from the principal shell by a void space. The construction results in a markedly improved resistance against shock initiation.
Claims7
A time-delay blasting initiator comprising a principal tubular metal shell closed at one end, a base charge of explosive within said principal shell, a priming charge adjacent said base charge, a delay charge adjacent said priming charge and an ignition means adjacent said delay charge, characterized in that said initiator further comprises a secondary shell being of smaller diameter than said principal shell and so positioned within said principal shell as to provide a circumferential void space, and wherein at least one of said base charge, said priming charge and said delay charge is contained within said secondary shell.
Dependencies are inferred from the claim text.