Ammunition and explosives – Igniting devices and systems – Electrical primer or ignitor
Patent
1995-01-12
1997-04-15
Carone, Michael J.
Ammunition and explosives
Igniting devices and systems
Electrical primer or ignitor
10220214, 1022029, F42C 1902, F42C 1912
Patent
active
056211830
ABSTRACT:
An electrically actuatable initiator (10) for an air bag inflator (20) includes an electrically sensitive ignition charge (280) disposed in an electrically conductive ignition cup (290). A plastic insulation cup (320) overlies the ignition cup (290). The insulation cup (320) electrically insulates the ignition cup (290) to block the flow of electric current into the ignition cup to prevent unintended actuation of the ignition charge (280). A locking ring member (380) is made from a shape-memory alloy which shrinks in diameter when heated above a predetermined temperature. The locking ring member (380) secures an output cup (360) to a retainer (150) and hermetically seals between the output cup and the retainer. A second locking ring member (310) secures the ignition cup (290) to a header (150) and seals between the ignition cup and the header.
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Special Devices, Incorporated, two pages of drawings of initiators, dated prior to applicant's invention.
Carone Michael J.
Montgomery Christopher K.
TRW Inc.
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