ACCUMULATED DETONATING CORD CHARGE, METHOD AND USE

WIPO Patent Application WO2000045123

A3

An initiator (14c) for a secondary explosive receptor charge is provided by forming a length of detonating cord (14) into a helical coil containing a plurality of windings with a cut-off barrier provided by e.g., a separating rib (46) between adjacent windings. The adjacent windings may be not more than about 0.5 inch (12, 7 mm) apart. The detonating cord (14) may be wound about a spindle (16) which may optionally provide the separating rib (46). The coil may be a tapered coil which may define a taper angle of e.g., from about 2 to 4 degrees. Alternatively, the coil may be a cylindrical coil, or the cord may be configured in a planar spiral. Optionally, the detonating cord in the helical coil may have a core of explosive material with a loading of less than 15 grains per foot of the cord, e.g., less than 12 grains per foot of the cord, or a loading in the range of from 8 to 12 grains per foot of the cord. The coil may consume about six inches of the cord. Conversely, the detonating cord in the spiral may have a core of explosive material with a loading of at least 2.5 grains per foot, optionally at least 15 grains per foot of the cord.

BADGER FARRELL G
LEE ROBERT A
BAHR LYMAN G
SUTULA DANIEL P JR

PCT/US2000/001227

February 01, 2001

January 19, 2000

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ENSIGN BICKFORD CO (US)

F42B3/00; (IPC1-7): C06C5/04; E03B3/11; F42B3/00; G01V1/06

US0100884A	1870-03-15
US3244099A	1966-04-05
US3289583A	1966-12-06
US3698316A	1972-10-17
US3729060A	1973-04-24
US3832949A	1974-09-03
US4284006A	1981-08-18
US4615752A	1986-10-07
US4667599A	1987-05-26
US5125473A	1992-06-30

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