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Gas generator for multi-stage air bag and air bag device

  • US 6,722,694 B1
  • Filed: 09/25/2000
  • Issued: 04/20/2004
  • Est. Priority Date: 02/16/1999
  • Status: Expired due to Term
First Claim
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1. A multistage gas generator for an air bag, comprising:

  • a housing including a diffuser shell having a plurality of gas discharge ports formed in a circumferential outer wall thereof, and a closure shell attached to the diffuser shell;

    a first combustion chamber and a second combustion chamber provided inside the housing, each of the first combustion chamber and the second combustion chamber accommodating gas generating agents which generate combustion gas that inflates the air bag;

    a first ignition unit attached to the housing for directly igniting only the gas generating agent accommodated in the first combustion chamber;

    a second ignition unit attached to the housing for directly igniting only the gas generating agent accommodated in the second combustion chamber;

    an inner cylinder for accommodating the first ignition unit therein and having at least an open end opposing the diffuser shell; and

    a lid made of an element independent from said inner cylinder and provided between the open end and the diffuser shell such that a first surface of said lid opposes the diffuser shell and a second surface thereof covers the open end, said lid being substantially flat and having no opening at least in a portion thereof where the lid covers the open end, wherein, said inner cylinder is provided eccentrically with respect to a center axis of said housing, and the first ignition unit and the second ignition unit are disposed in said housing eccentrically with respect to the center axis of said housing.

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