Abstract: In a tiltable or pivotal window in which the frame and sash side members that are perpendicular to the axis of rotation have oppositely facing abutment surface sections on either side of the axis area, said abutment surface sections merge smoothly into each other through an abutment surface section formed as a helical surface of about 180.degree.. A continuous weather strip may be provided on one or both of the abutment surfaces. If such strips are provided on both surfaces, they may be magnetic with opposite transverse polarization to improve tightness and minimize sliding contact between the strips in the helical surface area.

Abstract: In a tiltable window, especially to be mounted in a sloping roof, the lateral members of the sash and frame carry external cover rail sections which in the closed position of the window overlap each other in the area of the hinge device of the window. The hinge device consists of a frame part and a sash part and of an intermediate part connected with each of the two parts by means of two parallel pivot pins which in the closed position of the window are situated within the outer side of the window and are protected by the cover rail sections. During the opening movement of the sash, its hinge part is first rotated in relation to the intermediate part while this part is locked to the frame part by means of a latch, and after the forcedly controlled release of the latch, the sash part and the intermediate part together can rotate further in relation to the frame part.

Abstract: For the dehumidification of a cavity preferably the intermediary space (3) between the glass sheets (1, 2) of a window, the dehumidifying device comprises a cell (5, 6, 7) shaped as a cartridge to be inserted in an opening in one of the glass sheets and so arranged as to absorb and by electrolysis to dissociate the water molecules from said cavity (3) by application of external energy. (FIG. 1).