Powered window operator drive

For use with a window having a fixed frame and a movable sash, and a manually driven window operator mounted to said frame and including an operator shaft rotatable to drive a linkage mechanism fastened to said sash to selectively move the sash relative to said frame to open or close the window, a motorized operator drive comprising:

• a one piece housing having connected walls defining an inner space and a top opening providing access to said space, said housing including first and second cradles formed integrally at a motor end and a drive opening at an opposite nose end;
• a plurality of gear shafts secured in said housing and extending vertically to said top opening;
• a motor seated in said housing between said cradles and having an output shaft defining a worm gear;
• an output gear including a shaft received in said drive opening;
• a gear set comprising a plurality of gears installed in said housing on selected ones of said shafts for operatively coupling said worm gear to said output gear;
• a top plate secured to said housing at said top opening for securing said motor, said gear set and said output gear in said housing inner space and in operative engagement;
• an adapter, in use, secured to said output gear and said operator shaft to rotate said operator shaft in response to energization of the motor;
• a bracket fixedly mountable to the window frame for mounting said housing motor end to the window.