Window sash

Claim 1

A sash adapted to be received in an opening in a window or the like having channels constituting tracks for the sash at opposite sides of the opening, the sash comprising: a pair of side members; a pair of cross members; and means for securing the side and cross members together at joints, said securing means comprising a pair of screws at the joints at the ends of a cross member of the sash, each screw having a threaded shank and a head of generally uniform circular section throughout its length, the shank extending through a hole in one of said side members and being received in threaded engagment in an opening in the end of said cross member, the head projecting laterally outwardly from the side member, having an inner face in engagement with the side member and means at its outer end adapted to be engaged by means for turning the screw, the head being adapted to extend for substantially its entire length within the respective track thereby enabling the window sash to be fitted in the window with its side members closely adjacent the channels of the window and thus with no substantial gap between the side members and the channels, and having its generally cylindrical outer surface in sliding engagement with the respective track thereby enabling both sliding movement of the sash in the tracks and swinging movement of the sash in the window opening about the outer surfaces of the heads of said screws.