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Air bag

  • US 5,114,180 A
  • Filed: 04/02/1989
  • Issued: 05/19/1992
  • Est. Priority Date: 08/03/1988
  • Status: Expired due to Term
First Claim
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1. An air bag for mounting in a vehicle having, when inflated, a first portion for opposing the vehicle and a second portion for opposing an occupant, the air bag comprising:

  • at least two pieces of gas permeable fabric, each having a circumferential edge, joined to one another at a continuous seam radially inward from the circumferential edge, forming an air bag having an interior and an exterior surface;

    one of the at least two pieces of gas permeable fabric constituting the first portion having an opening therein defined by an internal perimeter edge;

    another of the at least two pieces of gas permeable fabric constituting the second portion;

    a gas impermeable coating disposed on at least a fraction of the second portion forming a continuous impermeable area for engaging, when inflated, an occupant'"'"'s torso and head;

    a gas generator connected to the first portion adjacent the internal perimeter edge of the opening for inflating the air bag to a predetermined pressure upon impact of the vehicle with another object; and

    the at least two pieces of gas permeable fabric having a total gas permeable uncoated area selected as a function of warp and weft density of the gas permeable fabric for uniformly exhausting gas to approximately zero pressure in the air bag in the range from approximately 70 milliseconds to 170 miliseconds from commencement of inflation of the air bag and in response to the predetermined pressure of the gas during inflation of the air bag and external pressure of the occupant against the second portion of the air bag.

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