Ammunition and explosives – Igniting devices and systems – Electrical primer or ignitor
Reexamination Certificate
1999-03-24
2001-08-14
Jordan, Charles T. (Department: 3641)
Ammunition and explosives
Igniting devices and systems
Electrical primer or ignitor
C102S202700, C102S202900, C149S002000, C149S110000, C149S019100, C280S741000, C280S740000
Reexamination Certificate
active
06272992
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an igniter and method of making an igniter, and particularly relates to an ignition material for an igniter for inflating an inflatable vehicle occupant protection device.
BACKGROUND OF THE INVENTION
An inflatable vehicle occupant protection device, such as an air bag, is inflated by inflation gas provided by an inflator. The inflator typically contains ignitable gas generating material. The inflator further includes an igniter to ignite the gas generating material.
The igniter contains a charge of ignition material. The igniter also contains a bridgewire which is supported in a heat transferring relationship with the ignition material. When the igniter is actuated, an actuating level of electric current is directed through the become resistively heated sufficiently to ignite the ignition material. The ignition material then produces combustion products which, in turn, ignite the gas generating material.
SUMMARY OF THE INVENTION
The present invention is an electrically actuatable igniter which comprises a body, a pair of electrodes associated with the body, a heating element electrically connected between the electrodes, and an ignition droplet covering and adhering to the heating element. The ignition droplet comprises a particulate pyrotechnic material and a particulate polymer resin binder. The particles of polymeric resin binder are fused together and form a structure having interconnected open cells. The particles of pyrotechnic material are disposed within the interconnected open cells and form a combustible network of pyrotechnic material.
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Jordan Charles T.
Sanchez Glenda L.
Tarolli, Sundheim, Covell Tummino & Szabo L.L.P.
TRW Inc.
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