Abstract: A window frame assembly which comprises a first intermediate frame member and a second intermediate frame member adapted to be inserted from opposite sides of a window opening to embrace the edges of the window opening. The first frame member has a locking channel extending about the periphery of its inner end and the second intermediate channel has locking tongues projecting inwardly therefrom which are adapted to be inserted within the locking channel of the first intermediate member. The second intermediate frame comprises a plurality of frame lengths connected to one another at opposite ends to form corners of the second intermediate frame. A locking tongue formed on each length terminates short of the corners of the second intermediate frame so that the locking tongues are independently flexible to facilitate the insertion of the locking tongues within the locking channels when the second intermediate frame is interlocked with the first intermediate frame in use.

Abstract: A window frame assembly for use in a window opening which extends from one side of a body such as a door, a wall or the like to the other side thereof comprising a preassembled first frame which includes a header member, side rail members and a sill member arranged and proportioned to fit within said window opening, each of said members comprising a transverse wall adapted to extend between the sides of said body, said transverse wall having first and second longitudinally extending sides, a first flange projecting outwardly from said transverse wall at said first side thereof for engagement with said one side of said body to prevent direct removal of said first frame from said opening through said other side, means located inwardly of said transverse wall for mounting at least one window unit within said first frame, and first locking means extending longitudinally of said frame member, said first locking means being engageable from said other side of said body in use, and a locking rail for each of said mem