Door or window closure

A door or window closure comprising:

• a one piece housing suitable for attachment to the door or window, said housing comprising a section of predetermined width of a generally U-shaped extrusion having a base wall with side walls extending therefrom at either end, concave guide means within said housing and opening toward the interior of said housing for guiding fastener means extending through said housing, one such guide means being mounted on an intermediate portion of the inner surface of each of said side walls by a bridge member which spacedly positions said guide means from said side wall, a first ridge on the inner surface of each of said side walls adjacent the free end thereof, each of said guide means having a second ridge positioned in opposition to one of said first ridges for forming a narrow opening to a larger space defined by said first and second ridges and said bridge member, said guide means, bridge members, and first and second ridges extending across the width of said housing;
• a pinion rotatably journalled in said base wall of said housing, said pinion being coupled to an operating member for said closure;
• a closing plate extending across the open end of said U-shaped section and joined to said housing by fasteners extending through said narrow openings between said first and second ridges, said closure plate having an opening in the central portion thereof;
• and
• a slide member slideably retained on the exterior of said closing plate for movement in a plane parallel to said base wall, said slide member having at least one locking member projecting therefrom, said slide member having a rack extending through the opening in said closing plate into the interior of said housing and into engagement with said pinion for providing movement to said slide member upon rotation of said pinion.