| 摘要 |
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 th an 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 t o 4 degrees. Alternatively, the coil may be a cylindrical coil, or the cord ma y 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 th an 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 detonatin g cord in the spiral may have a core of explosive material with a loading of a t least 2.5 grains per foot, optionally at least 15 grains per foot of the cor d.
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