GB910408A - Input-coded shaft positioning device - Google Patents

Abstract

910,408. Electric selective signalling systems. COLLINS RADIO CO. Jan. 6, 1959 [May 26, 1958], No. 533/59. Class 40 (1). In a device for positioning an output shaft selectively in one of a thousand discrete positions, e.g. for controlling a radio, control is effected either by three coded-gap switches 31, 32, 33, Fig. 1, which allow any one of the one thousand positions to be selected or by a drum (shown in detail in Figs. 4 and 5) controlled by a knob 34, Fig. 1, which allows any one of twelve of the possible one thousand positions to be selected, the particular twelve being determined by the positions of manually adjustable pins 46, Fig. 4, which co-operate with contacts 43, Fig. 5, and a two-position switch 72, Fig. 1, determining whether control is effected by the drum (D) or by the switches (M). The twelve output positions set on the drum can be altered by sliding the pins to different positions. On the control panel, Fig. 1, the number that appears in a window 42 is the number of the drum channel accessible for alteration while the number on knob 34 adjacent a pointer 35 is the number of the drum channel that is actually controlling the contacts 43. The receiver comprises three coded-gap seeking switches controlling shafts 11, 12, 13, Fig. 1, which via differential gearing control the output shaft. Specification 795,976 is referred to.