초록 ▼

A unitary composite frame member of two or more structural elements. A first and a second of the elements each contributes strength to the member. The second element which is preferably a plastic, has a conductivity not exceeding 5% of that of the first element, and covers the first element, contrib

A unitary composite frame member of two or more structural elements. A first and a second of the elements each contributes strength to the member. The second element which is preferably a plastic, has a conductivity not exceeding 5% of that of the first element, and covers the first element, contributing to the shape of the frame member. Preferably each of the two elements is strong enough to retain its shape without aid from the other element, and the second element contributes at least 10% of the structural strength of the member. The elements are molded together, with the covering element in a plurality of similarly shaped openings in the element that it covers.

대표청구항 ▼

In an improved inflexible frame member of predetermined shape, for windows, doors or the like, said frame member comprising: a first element having a length, at least one surface, and being substantially non-hollow in transverse cross section, said first element being a metal, and being inflexible a

In an improved inflexible frame member of predetermined shape, for windows, doors or the like, said frame member comprising: a first element having a length, at least one surface, and being substantially non-hollow in transverse cross section, said first element being a metal, and being inflexible and structural in nature, for contributing structural strength to said frame member, a second element, said second element being a plastic, and being inflexible, structurally strong independently of said first element, comprising the shape of the frame member, and enclosing said first element on essentially all surfaces along its length in a composite, unitary molding with said first element, said first element comprising a first wall (324, 440) substantially the length of said first element, and a second wall (326, 404), said first wall having a first side, a front and a back, and said second wall having a first side, a front and a back, said second wall being connected on its first side to the first side of said first wall in a substantially continuous joining, substantially along the length of said first wall, and angled from the plane of said first wall, a first plurality of openings through said first wall, enclosed within said first wall, and exclusive of said second wall, said second element being molded to itself from the front to the back of said first wall though said first plurality of openings, the improvement comprising said first plurality of openings comprising a triangular pattern grid (104, 200 FIGS. 10 and 12) for reduction in transverse thermal flow and for strength and rigidity against transverse bending of said frame, in which said openings occupy no less than 70% of the area of said grid.