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Seat belt retractor

  • US 6,910,653 B2
  • Filed: 12/24/2002
  • Issued: 06/28/2005
  • Est. Priority Date: 12/27/2001
  • Status: Active Grant
First Claim
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1. A seat belt retractor comprising:

  • a motor for rotating a spool to wind up a seat belt;

    a power transmission switching mechanism which, in a connected state, allows the spool to rotate only in a seat belt winding direction and which, in a disconnected state, allows the spool to rotate in both directions;

    a force limiter mechanism which allows the spool to rotate in a seat belt withdrawing direction against a rotation limiting force when a force to rapidly withdraw the seat belt is applied; and

    a pyrotechnic pretensioner which forces to wind up the seat belt at the time of detection of a collision, wherein the power transmission switching mechanism is set into the disconnected state by the movement of a mechanical portion of the pyrotechnic pretensioner which moves when the pyrotechnic pretensioner is activated, thereby disconnecting the mechanical connection of the motor and the spool.

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