Door or window frame of hollow plastic sections with visible exterior and interior surfaces

摘要

Region between the outer walls (9,10) between the outer and inner visible faces (3,5; 4,6) of an L or Z-shaped hollow plastic section with a number of hollow chambers, forming window casement or door frame has recesses (11) and/or additional hollow chambers (12) and/or regions of reduced wall thickness. Preferably, at least part of the hollow chambers (7,8) between the visible surfaces is filled with a pourable thermal insulation material and these chambers can have sloping partition walls (15, 16) which form tension and compression members of a lattice structure.