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Seat belt retractor and controlling method of the same

  • US 5,887,814 A
  • Filed: 10/16/1997
  • Issued: 03/30/1999
  • Est. Priority Date: 10/17/1996
  • Status: Expired due to Term
First Claim
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1. A seat belt retractor, comprising:

  • a base;

    a bobbin around which a webbing is to be wound and coupled with said webbing;

    a torsion bar inserted through said bobbin and rotatably supported by said base, said torsion bar being connected integrally with said bobbin on the one end side thereof;

    first lock structure for making a first condition in which the other end side of said torsion bar is connected with the base and a second condition in which the other end side of said torsion bar is disconnected with the base;

    control members, in accordance with the winding amount of the webbing, switched between an operable position causing said first lock structure to be in said first condition and an inoperable position in which said first lock structure is independent of said control members;

    a second lock structure capable for making a coupling condition in which said base and said bobbin are coupled with each other and a decoupling condition in which said base and said bobbin are decoupled with each other, wherein when said control members is in said operable position, said second lock structure is brought in said coupling condition.

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