Abstract: The invention relates to apparatus for making a heat-insulated structural section assembly for use in window and door frames consisting of at least two structural metal sections transversely connected to each other by at least one heat-insulating bar and including at least one pressure roller which is adapted to apply pressure against a flange on the structural section in order to hold the heat-insulating bar firmly in place. The improvement resides in the provision of oblique, parallel grooves in the peripheral surfaces of said pressure roller, oriented at an acute angle to the direction of rotation of the pressure roller.

Abstract: This invention relates to methods and apparatus for making heat-insulated structural section assemblies for use in window and door frames, and the like. The structural section assemblies consist of two structural metal sections transversely connected to each other by a pair of parallel, heat insulating bars spaced from each other and having longitudinal ends of swallow-tail cross-sectional shape which are successively received between pairs of longitudinally extending opposite grooves each defined by upper and lower flanges of said structural sections, whereby said pair of heat-insulating bars define an enclosed space, these grooves loosely receiving first one of said heat-insulating bars being closed upon said first heat-insulating bar by continuously pressing said upper flanges against said heat-insulating bar.