Time delay primer and method of making same

Details Time delay primer and method of making same Time delay primer and method of making same

1977-05-23

1979-09-04

Pendegrass, Verlin R.

Ammunition and explosives

Igniting devices and systems

102 27R, F42B 310

Patent

active

041664183

ABSTRACT:
An improved delay primer unit for detonating an explosive material in a borehole with a detonating cord down line extending into the borehole. The primer comprises an explosive element capable of detonating the explosive material upon being detonated, means for preventing direct detonation of the explosive element by the down line, a time delay detonating element extending between the down line and the explosive element with a known detonation time delay value between first and second ends of the delay element, means slidably associating the first end with the down line and means for connecting the second end in detonation relationship with the explosive element. The improvement in this type of unit is the provision of the explosive element as a support element and a detonating cord wrapped around the support element to form a primer.

REFERENCES:
patent: 2736263 (1956-02-01), Lewis et al.
patent: 4060033 (1977-11-01), Postupack et al.
patent: 4060034 (1977-11-01), Bowman

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