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Variable drive mechanism for the panel of a gate or similar structure

  • US 4,888,531 A
  • Filed: 02/02/1988
  • Issued: 12/19/1989
  • Est. Priority Date: 02/12/1987
  • Status: Expired due to Term
First Claim
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1. An arrangement for controlling a drive mechanism with a driving motor for moving a gate back and forth between two limiting positions and selectively through at least one stop position along a predetermined path, comprising:

  • switching means for determining when a predetermined limiting position or stop position is being approached and emitting signals to switch off operating power to said motor;

    at least one reference-point detector for generating a synchronization signal when said gate travels through a predetermined reference-point position between said limiting positions;

    memory means for accepting, storing, and emitting data of said limiting positions and data of said selectively at least one stop position; and

    a position detector for supplying a value representing every actual position traveled through by said gate, said position detector receiving a positional-value readjustment dependent on said synchronization signal, said position detector releasing an output signal for switching off the operating power to said motor dependent on the direction the reference-point position is traveled through according to the predetermined limiting position or the stop position of said gate along said direction and selectively determined by a related output from said memory means once said gate arrives at said reference-point position.

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