| 摘要 |
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. |
