GB982680A - Anti-glare device - Google Patents

Abstract

982,680. Double glazing. G. BECKMANN, and T. FAULHABER. Sept. 14, 1961, No. 32987/61. Heading E1R. [Also in Divisions Fl and G2] An antiglare device comprises, Fig. 2, at least two transparent panes 1 having a variable gap between them for receiving a liquid or gaseous light filtering medium and a suction pump 7 capable of effecting a reduction of pressure within the gap to withdraw the medium from between the panes and to reduce the distance between the panes. The pump in Fig. 2 is a diaphragm pump. The pump shown in Fig. 5 is a piston pump normally held by spring 32 in a position in which the panes are pressed together and the liquid is in chamber 34. When a current is passed through coil 27 the piston moves to the left forcing the liquid between the panes. The piston stroke may be limited by means of screw 35 and the operative parts of the panes by means of clamps 36 to produce a liquid line at 37. When the invention is applied to a large window the panes are inserted into a frame with their upper edges straight or only slightly curved and their lower edge considerably curved to increase their resistance to further bending when liquid enters the gap. A third pane may be provided behind the others and the intermediate gap filled with a suitable gas to act as a heat insulator. For smaller and horizontally installed windows the panes of glass are thickened to withstand the weight of the liquid. The transparent panes may be mounted on either side of a spacer, with a sealing pad on the outside of each pane between it and a frame; with a sealing pad round the edges of the frames; in a W-shaped or V-shaped, or T-shaped gasket; with a tubular gasket arranged in grooves in the inner surfaces of the frames. The edges of the panes may be bent outwards at their edges. The panes may also be fixed in a U- shaped frame by means of a liquid which is forced between the frame and the panes and then set. The light absorbing characteristics of the liquid may also be changed by means of an electric current or a magnetic field if a suitable liquid is chosen. The liquid may also be coloured. The panes may be polarisers or filters. Metal particles can be added to the liquid which have the property of becoming regularly aligned when subjected to ultrasonic radiation to decrease dazzling when used in a car. The ultrasonic radiation may be controlled automatically by light from oncoming cars &c. An aromatic substance may be placed between the panes to detect for leaks.