strengthening strips including a strengthening liner consisting of a strengthening strips, two chambers, and an adhesive useful in building construction for the shutter- (sic) or sash frames of windows or doors

摘要

strengthening strips for the shutter- (sic) or sash frames of windows or doors with a strengthening liner (SL) extending along the bar (sic) for receiving the forces acting within the plane of the frame. The SL consists of two parallel strengthening strips (5) in chamber (3) within the hollow profile bar, which includes another, larger chamber (2). Strips (5) are adhesive bonded to the hollow profile bar by means of adhesive (8). An independent claim is included for a method of preparing the profile bar from synthetic plastic involving extrusion.