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Pressure sensitive airbag vent mechanism

  • US 5,704,639 A
  • Filed: 07/09/1996
  • Issued: 01/06/1998
  • Est. Priority Date: 07/09/1996
  • Status: Expired due to Term
First Claim
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1. An inflatable airbag comprising:

  • airbag material having an outer surface and an inner surface, said inner surface defining an inflation chamber into which inflation gas is directed to inflate the airbag, said airbag material having a ventilation opening therein for venting inflation gas from the inflation chamber;

    a sealing member extending across and sealing the ventilation opening to inhibit said inflation gas from venting from said inflation chamber, said sealing member having a frangible region with a weakening line located at least partially over said ventilation opening, the frangible region of the sealing member being intact when the inflation pressure in said inflation chamber is below a predetermined level with the sealing member retaining the inflation gas within the airbag unless the inflation pressure reaches or exceeds said predetermined level, said frangible region capable of breaking open when the inflation pressure in said inflation chamber equals or exceeds said predetermined level; and

    ,securing means for securing said sealing member to said airbag material.

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