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Seat belt retractor employing ultrasonic motor

  • US 5,765,774 A
  • Filed: 04/05/1996
  • Issued: 06/16/1998
  • Est. Priority Date: 04/05/1996
  • Status: Expired due to Fees
First Claim
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1. A seat belt retractor comprising:

  • a) a reel having a shaft for reeling and unreeling a seat belt;

    b) an ultrasonic motor for rotating the shaft, the ultrasonic motor comprising;

    1) a plurality of piezo-electric devices, said piezo-electric devices receiving a control signal for actuating said ultrasonic motor,2) a stator secured to said piezo-electric devices and3) a rotor placed adjacent said stator;

    c) said rotor integral with or rigidly attached to said shaft for rotating said shaft upon actuation of said motor, said shaft rotating in a first direction to retract said seat belt and rotating in a second, opposite direction to extract said seat belt; and

    d) a control device for controlling the rotation of the ultrasonic motor by supplying said control signal to said ultrasonic motor.

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