Integrated casement window operator and lock with anti-backdrive feature

A casement window, comprising:

• a frame defining an opening;
• a sash received in the frame and hinged to the frame to selectively close the opening;
• and
• a window operator and lock, the window operator and lock comprising:
• a gear mechanism, the gear mechanism including a housing, a pinion gear rotatably mounted to the housing, and an arm assembly including an arm and a sash interface link, the arm defining a rack portion and an adjacent arcuate gear portion, the arm slidably and rotatably mounted to the housing with the pinion gear engaged with the rack portion and the arcuate gear portion, the pinion gear defining a star-shaped aperture therethrough, the star-shaped aperture defined by a plurality of inwardly facing surfaces, each of the inwardly facing surfaces comprising a pair of bearing surfaces on opposite sides of a central ridge, the pinion gear further defining a pair of spaced-apart slots, the slots extending, outwardly from a separate one of the pair of bearing surfaces of one of the inwardly facing surfaces, the housing defining an arc-shaped slot with notches at opposing ends of the arc-shaped slot;
• a pair of anti-backdrive pin assemblies, each of the anti-backdrive pin assemblies slidably disposed in a separate cane of the spaced-apart slots of the pinion gear and including an anti-backdrive pin, each of the anti-backdrive pins engaged in the arc-shaped slot;
• and
• a handle defining a square-shaped shaft portion, the square-shaped shaft portion received in the star-shaped aperture of the pinion gear, wherein the handle is selectively movable to rotate the pinion gear such that the arm is shifted between a window fully closed position and a window fully open position, wherein when the arm is in the fully closed position, the pin of a first one of the pair of anti-backdrive pin assemblies is engaged in one of the notches of the arc-shaped slot to inhibit backdriving of the arm, and when the arm is in the fully open position, the pin of a second one of the pair of anti-backdrive pin assemblies is engaged in the other one of the notches of the arc-shaped slot to inhibit backdriving of the arm, the square-shaped shaft portion of the handle being rotatable in the star-shaped aperture of the pinion gear to shift the anti-backdrive assemblies out of engagement with the notches.