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Gas generator for multi-stage air bag

  • US 7,055,855 B2
  • Filed: 06/08/2001
  • Issued: 06/06/2006
  • Est. Priority Date: 06/12/2000
  • Status: Expired due to Term
First Claim
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1. A multistage gas generator for an air bag, comprising:

  • a cylindrical housing having at least one first gas discharging port and at least one second gas discharging port;

    a first inner cylindrical member disposed inside the cylindrical housing and provided, in a peripheral wall thereof, with first flame-transferring holes, both end portions of the first inner cylindrical member being in contact with the cylindrical housing;

    a second inner cylindrical member disposed inside the cylindrical housing and provided, in a peripheral wall thereof, with second flame transferring holes, both end portions of the second inner cylindrical member being in contact with the cylindrical housing;

    a first combustion chamber provided inside the cylindrical housing and accommodating a first gas generating agent therein;

    a second combustion chamber provided inside the cylindrical housing and on top of the first combustion chamber with respect to an axial direction of the cylindrical housing and accommodating a second gas generating agent therein, the second combustion chamber being defined separately and without communication with the first combustion chamber, such that a first gas generated in the first combustion chamber is discharged only through the at least one first gas discharging port and a second gas generated inside the second combustion chamber is discharged only through the at least one second gas discharging port;

    first igniting means adapted to ignite the first gas generating agent accommodated inside the first combustion chamber; and

    second igniting means adapted to ignite the second gas generating agent accommodated inside the second combustion chamber.

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