Abstract: This invention relates to heat-insulated structural section assemblies for use in manufacturing window and door frames. There is disclosed a structural section assembly consisting of two metal structural sections having integral flanges defining opposed longitudinally extending grooves together with the webs of the respective structural metal sections, and transversely connected to each other by a pair of plastic heat-insulating bars, said structural metal sections defining an enclosed air space together with said heat-insulating bars and said flanges being adapted to clamp the ends of said heat-insulating bars within said opposite grooves, those flanges for clamping one heat-insulating bar which are adjacent to said inner space being made longer than the flanges for clamping the other heat-insulating bar, so that when the longer flanges are bent against the one heat-insulating bar a more stronger connection is provided.

Abstract: This invention relates to heat-insulated structural section assemblies for use in window and door frames. There is disclosed a structural section assembly consisting of an inner and an outer structural metal section, connected to each other by at least one plastic heat-insulating bar held in longitudinally extending opposed grooves of said structural metal sections, and at least one leg integral with one of said structural sections and extending generally parallel to the plane defined by the panel of the window or door frame. Said leg extends from the end of a flange partially defining the groove in said one structural section and said groove-defining flange being forced under pressure onto said heat-insulating bar, said groove-defining flange having a thickened portion which extends the entire length of the assembly on its upper surface facing away from said heat-insulating bar so as to prevent the pressure roller from forming notches in the flange or leg.