초록 ▼

A detonator closed at one end by a primer shell whose integrally closed end has a percussion-sensitive primer charge supported adjacent its inside surface, and its outside surface disposed across the end of the detonator shell, is actuated by the detonation of one or two lengths of low-energy detona

A detonator closed at one end by a primer shell whose integrally closed end has a percussion-sensitive primer charge supported adjacent its inside surface, and its outside surface disposed across the end of the detonator shell, is actuated by the detonation of one or two lengths of low-energy detonating cord (LEDC) adjacent the primer shell\s outside end surface, a single length of LEDC being arrayed in a manner such that a pair of axially separated segments thereof, or two lengths arrayed in a manner such that a segment from each length, is anchored in place in side-by-side relationship adjacent said surface. This cord array assures reliable ignition of a center- or rim-fired percussion primer by means of the side-output of LEDC even with explosive core loadings at the low end of the LEDC loading range. A preferred detonator has a sleeve having a loop-like projection, most preferably M-shaped, diametrically disposed beyond the primer shell end through which a looped length of LEDC can be threaded in various ways to hold the pair of segments adjacent the primer shell.

대표청구항 ▼

In a non-electric blasting assembly comprising: (a) a percussion-actuated detonator comprising a tubular metal detonator shell integrally closed at one end and closed at the other end by a partially empty, shorter tubular metal primer shell having an open end and supporting a percussion-sensitive pr

In a non-electric blasting assembly comprising: (a) a percussion-actuated detonator comprising a tubular metal detonator shell integrally closed at one end and closed at the other end by a partially empty, shorter tubular metal primer shell having an open end and supporting a percussion-sensitive primer charge adjacent the inside surface of an integrally closed end, said primer shell extending open end first into said detonator shell to dispose the outside surface of its primer charge end across the end of said detonator shell, said detonator shell containing, in sequence from its integrally closed end, (1) a base charge of a detonating explosive composition and (2) a priming charge of a heat-sensitive detonating explosive composition; (b) a substantially U-shaped segment of a length of receiver detonating cord held with its apex adjacent the integrally closed end of said detonator shell; and (c) low-energy detonating cord (LEDC) adjacent the outside end surface of said primer shell; the improvement comprising a length of LEDC arrayed in a manner such that a pair of axially separated segments thereof are anchored in place, or two lengths of LEDC arrayed in a manner such that a segment from each length is anchored in place, in side-by-side relationship adjacent the outside end surface of said primer shell.