Window frame assembly

A window frame assembly for use in a rectangular 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) a preassembled rectangular shaped frame which includes a header member, side rail members and a sill member which are secured to one another and sealed in an end-to-end relationship and arranged and proportioned to fit within a rectangular window opening, each frame member comprising,
• (i) a composite transverse wall proportioned to extend between the sides of said body, said composite transverse wall comprising first and second wall panels which extend transversely and are interconnected at first and second side edges of said composite transverse wall to form a substantially rigid structure having a chamber formed inwardly thereof,
• (ii) a first flange projecting outwardly from said first wall panel at said first side edge 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,
• (iii) window mounting means on said second wall panel extending inwardly therefrom, said window mounting means being adapted to retain at least one window unit within said first frame, and
• (iv) a first locking channel formed in said second wall panel, said first locking channel extending longitudinally of and opening at said second side edge of said second wall panel to be engageable from said other side of said body in use, and
• (b) a locking rail for each of said members comprising a longitudinally extending second flange and a longitudinally extending locking tongue arranged in an L-shaped configuration, said locking tongue being adapted to be insertable within said locking channel to dispose said second flange opposite said first flange for engagement with said other side of said body to clamp said body between said first and second flanges,
• (c) interlocking means on said locking tongue and in said locking channel for releasably securing said locking tongue within said locking channel in use.