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Linear drive power door operator

  • US 5,513,467 A
  • Filed: 05/30/1995
  • Issued: 05/07/1996
  • Est. Priority Date: 05/30/1995
  • Status: Expired due to Term
First Claim
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1. A linear drive power door operator for selectively and automatically opening and closing a door swingably mounted on a door frame, said power door operator comprising:

  • a power screw extending along a horizontal axis;

    a drive connected to the power screw for powering the rotation of the power screw about said horizontal axis;

    a piston having a threaded bore threadably engaging said power screw, said piston being moved linearly along said horizontal axis upon activation of the drive and the rotational movement of the power screw;

    a rack having teeth, said piston engaging said rack for moving the rack linearly from end-to-end upon the linear movement of the piston;

    a pinion having teeth threadably engaging the teeth of the rack, said pinion being rotatable about a vertical axis upon the end-to-end linear movement of the rack;

    at least one link arm pivotally connected at one of its ends to the pinion and pivotally connected at its other end to the door; and

    a control for controlling the operation of the drive for moving the door between a closed position and an open position, said control activating said drive for moving the piston and the rack from a first position in which the door is closed to a second position in which the door is fully open, and any position in between.

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