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Seat position automatic adjusting device for an automotive vehicle

  • US 4,401,928 A
  • Filed: 11/20/1980
  • Issued: 08/30/1983
  • Est. Priority Date: 11/21/1979
  • Status: Expired due to Term
First Claim
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1. A seat position automatic adjusting device which operatively and selectively adjusts each of a plurality of seat members to a desired position and returns the currently adjusted set position of each of the seat members to a preset position defined by originally adjusted seat position data, the seat members including a seat, a a seat cushion fixed on the seat, a seat back, and a head restraint attached on the seat back, which comprises:

  • a reversible motor;

    a seat member adjusting mechanism incorporated into each seat member and operatively engaged with said reversible motor so as to move the corresponding seat member to a required position determined by a number of revolutions and rotating direction of said reversible motor;

    a motor drive circuit for driving said reversible motor to rotate selectively in the normal or reverse direction by a required number of revolutions with said seat member adjusting mechanism engaged with said reversible motor; and

    a control circuit connected to said reversible motor and motor drive circuit for detecting and storing the number of revolutions and rotating direction of said reversible motor when said motor drive circuit engages said reversible motor with said seat member to set the corresponding seat member and for operatively outputting a signal to said motor drive circuit to drive said reversible motor to rotate selectively in the normal or reverse direction according to the number of revolutions and rotating directions of said reversible motor stored therewithin so that the corresponding seat member returns to the original position;

    wherein said seat member adjusting mechanism includes means for selectively adjusting each seat member position so as to move the seat position up-and-down or back-and-forth, to recline the seat back forward or backward with respect to a vertical position, to incline the seat cushion and seat support portion with respect to a horizontal position to tilt a lumbar support position of the seat back forward or rearward, or to extend the head restraint in up-or-down direction with respect to the seat back, and said seat member adjusting mechanism comprises;

    an actuator for applying a turning force to the corresponding seat member so as to move the corresponding member to a required position; and

    an electromagnetic clutch provided with said corresponding actuator for engaging an output rotating shaft of said reversible motor with said corresponding actuator when said motor drive circuit drives said reversible motor;

    and wherein said control circuit comprises;

    rotation number detector means coupled to an output rotating shaft of said reversible motor for outputting a pulse train according to the rotation of said reversible motor, the number of which corresponds to the amount of revolution of said reversible motor;

    a seat position data counter connected to said rotation number detector for counting the number of pulses fed from said rotation number detector decrementally or incrementally according to the rotating direction of said reversible motor;

    an operation panel having a first switch for outputting a first command signal to store the counted value of said seat position data counter when manually turned on, a second switch for outputting a second command signal to send the counter value of said seat position data counter into said motor drive circuit so as to return each seat member to the preset position when manually turned on, and a plurality of address switches, each address thereof specified respectively for an individual user of the seat for activating the first and second command signals only when manually turned on;

    a memory for storing the counted value of said seat position data counter in response to the first command signal from said first switch activated by any one of the address switches of said operation panel and outputting the counter value of said seat position data counter stored therewithin in response to the second command signal from said second switch activated by any one of the address switches of said operation panel;

    a comparator for comparing the originally adjusted seat position data stored in said memory with the currently counted value of said seat position data counter; and

    a control unit responsive to said comparator for outputting a signal to said motor drive circuit to drive said reversible motor to rotate in the normal or reverse direction according to the number of revolutions and rotating directions of said reversible motor based on the compared result within said comparator in response to the first command signal activated by any one of the address switches received from said operation panel.

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