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Electrically adjusted safety restraint system

  • US 4,655,312 A
  • Filed: 10/15/1985
  • Issued: 04/07/1987
  • Est. Priority Date: 10/15/1985
  • Status: Expired due to Term
First Claim
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1. In an electrically adjusted safety restraint system for restraining an occupant in a vehicle'"'"'s seat having a seat belt with one end attached to a structural member of the vehicle and the other end attached to a seat belt retractor, wherein the improvement comprises:

  • an electric motor operatively connected to the retractor for actuating the retractor to retract the seat belt;

    switch means associated with the seat belt having a first state signifying that the seat belt is secured about the occupant and a second state signifying the seat belt is not secured about the occupant;

    a motor current sensor responsive to said first state for generating a snugged-up signal in response to the motor'"'"'s current exceeding a predetermined value signifying the seat belt has been snugged up to the seat'"'"'s occupant with a predetermined force;

    logic means for generating a first control signal in response to the state of said switch means, for terminating said first control signal in response to said snugged-up signal and for generating a second control signal in response to the termination of said first control signal; and

    motor power control means for providing electrical power to said motor in response to said first control signal for actuating the retractor to snug up the seat belt and to stow the seat belt when the seat belt is not secured about the occupant and in response to said second control signal for actuating the retractor to unreel a length of seat belt to produce a predetermined slack.

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