Thermally actuated percussion initiatable explosive cartridge as

Details Thermally actuated percussion initiatable explosive cartridge as Thermally actuated percussion initiatable explosive cartridge as

1974-10-18

1976-07-27

Pendegrass, Verlin R.

Ammunition and explosives

Igniting devices and systems

102 70R, 181116, F42B 310

Patent

active

039713199

ABSTRACT:
A percussion initiatable explosive assembly with means for thermal actuation of same, comprising an explosive cartridge shell with main explosive charge contained therein, and a percussion initiatable primer extending into the main charge in detonating relationship therewith; a thermostatic member including a laminate of a pair of metallic layers having different coefficients of thermal expansion shaped as a curved strip having opposed convex and concave surfaces, with the concave surface facing the percussion sensitive portion of the primer; a pin secured to the curved strip and extending from the concave surface into spaced apart relationship with the percussion sensitive portion of the primer; and the strip member in response to a temperature increase adapted to thermally expand to change the curvature of said convex and concave surfaces respectively toward concave and convex so as to move the pin into impact relationship with the percussion sensitive portion of the primer to cause percussion ignition of same, thereby providing for subsequent detonation of said primer base charge and in turn the main explosive charge.
A seismic system containing at least one explosive cartridge above described is also provided.

REFERENCES:
patent: 2487789 (1948-11-01), Carr et al.
patent: 3509820 (1970-05-01), Fitch et al.
patent: 3702589 (1972-11-01), Erbert

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