Importance

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Abstract

An operator for an awning type window having a sash pivotable about its top side relative to a window frame, with the operator controlling opening and closing movement of the sash relative to the frame. The operator includes a drive gear secured to a base on the frame, a sun gear pivotable about the axis on the base and drivably engaging the drive gear, a primary arm with a planetary gear rotationally attached thereon and drivably engaging the sun gear, a secondary arm pivotally mounted about a second axis on the base, and a pair of drive links pivotally interconnected between the planetary gear and the secondary arm. A bracket is fixed to the sash side opposite the one sash side, a first connecting arm is pivotally connected at one end to the primary arm and at the other end to the bracket, and a second connecting arm is pivotally connected at one end to the secondary arm and at the other end to the bracket, where all of the arms cooperate to move the sash bottom side toward and away from the frame to control opening and closing of the sash in response to rotation of the drive gear. The base includes a fixed primary arm stop which engages the primary arm to prevent lateral shifting of the window when the sash is closed against the frame. The base also includes a fixed secondary arm stop which engages the secondary arm to prevent lateral shifting of the sash during initial opening of the sash from a position closed against the frame.

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First Claim