Patent ID: 6044587
Filing Date: 2000-04-04
Classification: E05F,E05Y

Abstract:
An operator securable to a window frame and window sash generally pivotable relative to the frame about a first edge between open and closed positions, said operator when secured to the frame and sash adapted to control pivotal movement of the sash relative to the frame and comprising:a first arm having first and second ends, said first arm first end being slidably attachable to a second edge of the window sash opposite a first edge of the window sash about which the window sash is pivotable relative to the frame;a second arm having first and second ends, said second arm first end being slidably attachable to the second edge of the window sash and being pivotally secured to the first arm;a base attachable to the frame; andfirst means attached to the base and to the second ends of the first and second arms for pivoting the first arm relative to the second arm whereby the first ends and the second ends of first and second arms are generally disposed together when attached to the window sash in an open position and the first ends and the second ends are generally spaced apart when attached to the window sash in a closed position, wherein the first means further comprises:a third arm pivotally secured to the first arm and pivotally secured to the base about an axis;a fourth arm pivotally secured to the second and third arms; andsecond means for pivoting the third arm relative to the fourth arm.