Frame section for door or window - has I-section plastic part press fitting into folded steel I-section part

摘要

The two sections are profiled to fit into one another and one is made from stainless steel plate (7) whilst the other is made of plastic (8). This combination provides thermal insulation. The plastic section is approximately T shaped. The central limb (9) of the T passes between the prongs of the folded steel section. Outside the prongs the plastic section has two protuberances which have lips (11) which engage the folded end sections (12) of the prongs. When assembled the face which is perpendicular to the face of the building has two grooves one below the other (5 & 6). The upper groove (5) forms an outwardly tapering groove in cooperation with the steel section.