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ELECTRIC AUTOMATIC DOOR LOCKING SYSTEM

  • US 3,871,474 A
  • Filed: 06/06/1973
  • Issued: 03/18/1975
  • Est. Priority Date: 06/06/1973
  • Status: Expired due to Term
First Claim
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1. In a motor vehicle having a plurality of doors with each door being provided with door latching and locking mechanism, an electric automotive door locking system comprising:

  • a source of power;

    a solenoid control unit operatively connected to the door locking mechanism at each door of the vehicle, said solenoid control unit being responsive to an electrical signal for actuating the door locking mechanism;

    an AND circuit formed by a first switch responsive to weight on a vehicle seat corresponding to the driver'"'"''"'"'s position, a second switch responsive to engagement of the vehicle transmission into a drive position, a third switch responsive to running of the vehicle engine and a fourth switch responsive to closing of the vehicle doors, each of said first, second, third and fourth switches being operative to supply a ground voltage signal;

    a logical control unit electrically responsive to said AND circuit for generating said electrical signal applied to each of said solenoid control units; and

    an override control for electrically actuating the door lock mechanism regardless of the state of said AND circuit;

    said logical control unit comprising;

    a first transistor having its emitter-collector circuit electrically connected with said AND circuit so as to be capable of coupling said AND circuit with said source of power;

    a second transistor electrically connected with said solenoid control unit so as to be capable of connecting said source of power to said solenoid control unit; and

    a capacitor having one side thereof connected with said first transistor and its other side connected with said second transistor, said capacitor being responsive to a voltage level change from ground for causing said second transistor to energize said solenoid control unit.

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