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Safety circuit for vehicle electromotive window lifts

  • US 4,686,598 A
  • Filed: 12/03/1984
  • Issued: 08/11/1987
  • Est. Priority Date: 12/22/1983
  • Status: Expired due to Fees
First Claim
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1. In a safety circuit having therein a drive motor and means reversing the direction of rotation of said drive motor when there is a sudden increase in the motor current, said drive motor actuating a window lift and a window attached to said lift, the improvement comprising:

  • means rotating said drive motor through a predetermined period of time in a window-open direction upon actuation of a window-close switch and generation of a start-up current, thereby displacing said window through a predetermined distance in said window-open direction;

    means reversing the direction of rotation of said drive motor at the end of said predetermined period of time, thereby displacing said window in a window-close direction;

    means adjusting said predetermined period of time through which said drive motor rotates first in said window-open direction and thereafter in said window-close direction to such a length that the motor current has already assumed its normal value when the window has again reached a starting position; and

    means disconnecting said means rotating after switching the motor operation at the beginning of the movement of said window in said window-close direction.

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