Accumulated detonating cord explosive charge and method of...

F - Mech Eng,Light,Heat,Weapons – 42 – B

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F42B 1/00 (2006.01) F42D 1/04 (2006.01)

Patent

CA 2559981

An initiator for a secondary explosive receptor charge is provided by forming a length of detonating cord into a helical coil containing a plurality of windings with a cut-off barrier provided by e.g., a separating rib between adjacent windings. The adjacent windings may be not more than about 0.5 inch (12, 7 mm) apart. The detonating cord may be wound about a spindle which may optionally provide the separating rib. 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.

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