Window operator

An operator for controlling the movement of a window sash relative to a window frame between open and closed positions, said operator comprising:

• a base having a bottom surface capable of being supported by and attached to a window frame and having an upper surface with at least one depressed section;
• a cover wherein front and side portions of said cover contact a portion of the periphery of said base along a base mating shoulder which is formed in the cover and mates with the upper surface of said base to support said cover on said base and define an inner cavity between said cover and said base for housing a worm and a worm engaging arm, said cover having an angled tubular member mated with said depressed section of said base to form a worm enclosure with said depressed section of said base, said cover having a protruding stop at the back end of the worm enclosure and a wall defining a wall aperture, which wall aperture is completely within said cover at the front end of the worm enclosure;
• a worm engaging arm pivotally secured between said base and said cover and capable of being attached to a sash to control the movement of a sash between open and closed positions;
• a separate bushing defining a bushing aperture for a worm shaft said bushing being larger than said wall aperture and adjacent said wall and within the inner cavity so that said wall retains said bushing;
• and
• a worm drivably engaging said arm and having a worm shaft and a worm shoulder disposed on the worm shaft, said worm being positioned in said worm enclosure with one end being retained by said stop and the other end being retained by said bushing, said worm shaft protruding through said bushing aperture and said wall aperture;
• said worm enclosure, stop and bushing maintaining axial and transverse positioning of said worm;
• the back end of said cover being spaced apart from said base by said protruding stop being in contact with said upper surface.