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Two-stage automotive gas bag inflator using igniter material to delay second stage ignition

  • US 4,998,751 A
  • Filed: 03/26/1990
  • Issued: 03/12/1991
  • Est. Priority Date: 03/26/1990
  • Status: Expired due to Term
First Claim
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1. An inflator comprising:

  • an elongated housing,a bulkhead located in said housing at an intermediate position along the length thereof, said bulkhead having a perforation therein,a pyrotechnic gas generator contained within said housing comprised of first and second gas generating charges extending in end-to-end relation therein with one of said charges being located on one side of said bulkhead and the other charge being located on the other side thereof, andinitiator means in said housing comprising first and second igniter tubes associated, respectively, with said first and second gas generating charges for effecting ignition thereof, each of said igniter tubes having a common longitudinal axis and containing igniter material therein with the igniter material contained in said second igniter tube being characterized to burn at a rate different from the igniter material in the first igniting tube, and an elongated fuse extending through the perforation in said bulkhead and said igniter tubes and positioned substantially coincident with the common longitudinal axis thereof, and a single squib positioned adjacent a portion of said fuse, and operative when fired, to initiate activation of said fuse thereby to effect substantially simultaneous ignition of the igniter material contained in each of said first and second igniter tubes.

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