Detonators
AssigneeAltech Industries (Proprietary) Limited
InventorChristopher A. Willey
Life of this patent
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Abstract
A detonator has a transparent polycarbonate tubular casing, with an electric igniter inserted from one end to abut a constriction in the tube. The conflagration charge is deposited onto the igniter from the other tube end, and primary and secondary explosive charges respectively are added from that other end.
Claims20
A method of assembling a detonator comprising:
- fitting an electric igniter having an ignition area with a conflagration charge thereon within a tubular body having open first and second ends, so that the said ignition area is accessible from the first end, the electric igniter being fitted by insertion thereof from the second end;
- locating a primary explosive charge in operative proximity to the conflagration charge by insertion thereof through the first end;
- and
- locating a secondary explosive charge in operative proximity to the primary explosive charge by fitting a tubular extension containing the secondary explosive charge over the said first end.
A detonator comprising:
- a generally tubular body having an insertion end and another closable end, the insertion end being formed by a reduced diameter constriction generally concentric with the remainder of the tubular body;
- an end cap fixed over the constriction and having a tubular body which when operatively fixed extends the tubular housing;
- an electric igniter with a conflagration charge inserted into the tube through the said closable end to abut the said constriction;
- and
- a primary explosive charge operatively located within the constriction and next to the electric igniter, and a secondary explosive charge operatively located next to the primary conflagration and within the end cap.
An electric igniter comprising a base with two opposed surfaces, there being spaced apart electrically conductive areas on a first surface, and a hole leading from each conductive area to the second surface, each hole being plated through with electrically conductive material to be electrically connected to its respective area, the conductive areas being formed by screen printing of conductive ink on the first surface, and the through plating being achieved by applying a vacuum to the hole at the second surface to draw ink down and coat the sides of the holes.
Dependencies are inferred from the claim text.