GB278114A - Improvements relating to the control of electric lighting - Google Patents

Abstract

278,114. Chalmers, F. Z. July 15, 1926. Controlling consuming devices. - The following four lighting conditions for two lamps 42, 43, e.g. the head lamps of a motor vehicle, are obtained by the manipulation of a single handle 39 viz.: both lamps bright, both dim, lamp 42 bright, lamp 43 dim, and lamp 42 dim, light 43 bright. These conditions are respectively obtained when the contact arm 39 bridges contacts 35, 36, or when it rests on contacts 37, 36, 38. The arm 39 may also slide over the dimming resistance so as to provide intermediate lighting conditions. Fig. 3 shows a modification in which substantally the same circuit arrangement is used, but in which means are provided, viz., the sliders 22, 23, for short-circuiting predetermined portions at the ends of the resistance. A rotary switch arm (not shown) is connected to the source of current and has four positions 90‹ apart. In position 15 it engages contacts 10, 11 and conveys current directly to leads 50, 51. In position 17 it engages contact 12 and conveys current to the leads 50, 51 through portions of the dimming resistance and in positions 16 or 18 it engages contact 11 or 10 and conveys current directly to one of the leads 50, 51 and through the resistance to the other lead. The leads 50, 51 ane connected to contacts 26, 27 of an auxiliary switch adapted to be connected to contacts 28, 29, leading to the lamps, by movable bridging members. This auxiliary switch enables either head lamp to be extinguished.