WINDOW OR DOOR WALL UNIT
A window or door wall unit comprises panels (1, 2) of double-walled, heat-insulated sections articulatedly secured together which can be moved concertina-fashion and which are attached together by edge joints (3, 4) in which the rod (6) of a securing device is guided through individual edge joints. The edge joints (3, 4) consist of two parallel part-joints (31, 32 or 41, 42) which can be interlocked into the adjacent parts of the frame sections (11, 12 or 21, 22) and secured together by plastic components which act as guides for the rod (6).