Plural mode fuze

Details Plural mode fuze Plural mode fuze

1976-06-29

1977-06-14

Brown, David H.

Ammunition and explosives

Igniting devices and systems

102 72, 102 70R, 102 74, 102 76P, F42B 1350, F42B 2516, F42C 900

Patent

active

040290166

ABSTRACT:
A plural mode fuze with a bimetallic spring delay module providing delay ing, impact functioning, random time detonating and/or self-destruct functioning of a munition. The fuze includes a cup containing a detonator and a safing and arming means, a striker cup slidably nested therein, and an intermediate compression spring for moving the cups oppositely from a safe position to an armed position. The striker cup contains a fixedly mounted bimetallic spring delay module, which includes a bimetallic Belleville spring containing a firing pin, a pyrotechnic charge for heating the spring, a heat sink and thermal insulation means. The fuze has a means for locking the Belleville spring when it inverts by heat from the pyrotechnic charge, whereby the Belleville spring overcomes the compression spring. Impact of the fuze with the ground, prior to the expiration of the first delay period required to invert the Belleville spring, pushes back the striker cup, thereby overcoming the compression spring and driving the firing pin into the detonator. After expiration of said first delay period, the bimetallic Belleville spring, held by the locking means, inverts without moving the firing pin, thereby overcoming the compression spring and drawing the cups together so that the striker cup cannot move toward the detonator. In the latter condition the fuze cannot impact function but self-destruct functions when the Belleville spring snaps back after expiration of the second delay period required to revert said spring by cooling, thereby driving the firing pin into the detonator.

REFERENCES:
patent: 174325 (1876-02-01), Tyler
patent: 2454281 (1948-11-01), Hicks
patent: 2487789 (1949-11-01), Carr et al.
patent: 3702589 (1972-11-01), Erbert
patent: 3971319 (1976-07-01), Larson
patent: 3981239 (1976-09-01), Czajkowski et al.

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