Ammunition and explosives – Igniting devices and systems
Patent
1978-05-15
1980-06-24
Brown, David H.
Ammunition and explosives
Igniting devices and systems
102203, F42B 312
Patent
active
042089670
ABSTRACT:
The electrically initiated squib of this invention is comprised of a plug member with a pair of spaced apart electrical leads extending through the plug member into a holder member for containing a predetermined quantity of an easily-ignitable composition. A bridgewire that is constructed of a bimetallic composite (Pyrofuze) selected from palladium and aluminum, platinum and aluminum, and ruthenium-palladium alloy and aluminum is secured between the electrical lead ends that terminate in the holder member of the squib. The holder member is loaded with a loose, easily-ignitable composition which is a finely-ground and intimate mixture of a pyrotechnic which is a composition selected from the group consisting of 45% by weight zirconium and 55% by weight potassium perchlorate, 20% by weight boron and 80% by weight potassium nitrate, 45% by weight aluminum flake (17 to 44 microns) and 55% by weight potassium perchlorate (6 to 17 microns), and lead azide or lead styphnate, or a single-base, a double-base, or composite propellant composition in a powder or pellet form. The combination improves the reliability of the squib while reducing the controls on loading and assembly procedures. The amount of easily-ignitable composition to ensure ignition need not be controlled, since the proximity of the easily-ignitable composition to the bimetallic composite bridgewire is not critical. The amount of material that the bridgewire ignites may govern the squib output; however, the reliability of ignition is ensured by the presence of the easily-ignitable composition in the holder member where the bimetallic composite undergoes a violent exothermic reaction after being brought to its ignition temperature by the application of electric current. The violent exothermic reaction is accompanied by a deflagration or a throwing out of the high temperature constituents of the bimetallic bridgewire.
REFERENCES:
patent: 2604044 (1952-07-01), Sevold
patent: 2761386 (1956-09-01), Zebree
patent: 2934014 (1960-04-01), Smith et al.
patent: 3003419 (1961-10-01), Fife, Jr.
patent: 3135200 (1964-06-01), Jackson
patent: 3227083 (1966-01-01), Moses et al.
patent: 3420174 (1969-01-01), Potter
patent: 3910188 (1975-10-01), Stevens
"General Discussion of Pyrofuze Wire for Application of Bridging", Sigmund ohn Corp., Mt. Vernon, N.Y.
"Pyrofuze Application to Bridge Type Initiation", Pyrofuze Corp., Mt. Vernon, N.Y., 1965.
Brown David H.
Edelberg Nathan
Gibson Robert P.
The United States of America as represented by the Secretary of
Voigt Jack W.
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