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Automatic opening and closing device for a window

  • US 4,870,333 A
  • Filed: 10/02/1987
  • Issued: 09/26/1989
  • Est. Priority Date: 10/03/1986
  • Status: Expired due to Term
First Claim
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1. An automatic opening and closing device for a window comprising:

  • a forwardly and reversely rotatable motor for opening and closing a window; and

    control circuit means connected to said motor and including;

    switching means for instructing said motor to rotate;

    pulse-detecting means for detecting a pulse generated by the rotation of said motor;

    counting means for counting pulses detected by said pulse-detecting means and for resetting a count number to a predetermined count number according to a prescribed signal;

    holding means for holding the rotation of said motor according to a signal output from said switching means; and

    holding-cancel signal generating means for detecting a count number counted by said counting means and for cancelling a holding state of said holding means by generating a holding-cancel signal when the count number reaches a predetermined reference value during an opening operation of the window;

    wherein said holding-cancel signal generating means comprises;

    a reference value-setting circuit for setting said predetermined reference value corresponding to a car speed; and

    a holding-cancel signal generating circuit for comparing the count number counted by said counting means with said predetermined reference value and for outputting said holding-cancel signal when the count number reaches said predetermined reference value corresponding to said car speed.

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