Abstract: A snap in latch assembly for selectively locking a movable member to a fixed member and preferably for locking double hung windows includes a keeper which would be secured to the hollow rail forming the frame of the fixed sash. A latch housing would be secured to the hollow rail forming the frame of the movable sash. Both the keeper and latch housing are secured to their respective rails in a snap in manner without the use of fasteners such as rivets or screws. The keeper includes at least one retainer pin having an undercut for snapping into a slot in its rail and includes at least one anchor member for engagement with the rail when the keeper is slid to its mounted position. The latch housing includes at least one retainer arm having an undercut for snapping into a slot in its rail with at least one locator bar engaging the rail when the housing is slid to its mounting position.

Abstract: Various structures exist which require an element to be turned in a certain direction. The turning is accomplished by a programmable controlled winder which includes a motor driven tool in association with a computer for automatically stopping the rotation after a pre-set number of rotations have been made.