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DOOR OPERATOR

  • US 3,785,089 A
  • Filed: 07/14/1972
  • Issued: 01/15/1974
  • Est. Priority Date: 07/14/1972
  • Status: Expired due to Term
First Claim
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1. A power operated tilting door system for opening and closing a portal in a building, comprising in combination:

  • a door mounted on said building at said portal for tilting movement about a substantially horizontal axis, to open and close said portal;

    rotatable winch means on said door and motor means on said door for rotatably driving said winch means;

    an elongate strand in wrapping engagement with said winch means and having first and second free ends;

    first means securing said first end to said building on one side of said door;

    second means securing said second end to said door remotely from said winch means;

    strand tension means carried by said building on the other side of said door, said strand movably engaging said tension means intermediate its engagement with said winch means and second means;

    whereby rotation of said winch means by said motor means moves said winch means along said strand for opening and closing of said door.

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