Setting ring system for electronic time fuzing

Abstract

A system for manually setting a timing value of an electronic fuze for an artillery projectile prior to firing without tools or electric power, and for displaying the set timing value in standard decimal format. Two adjacent setting rings, disposed about the outside of the fuze housing, are interconnected together with the housing so that one ring rotates with the other ring when the other ring is manually rotated in one direction about the housing axis, but is prevented from rotating when the other ring is rotated in an opposite direction about the housing axis. Each ring carries a plurality of numbers disposed about its outer periphery such that one of the numbers is axially aligned with an indication mark on the fuze housing at each setting of the ring. The two series of numbers are oriented laterally so that the two numbers aligned with the indication mark constitute the desired timing value. Also these two series of numbers are selected so that the indicated timing value can be manually adjusted in equal time increments from a minimum value to a maximum value, with the total number of selectable timing values being equal to the number of settings of one ring times the number of settings of the other ring. Each ring actuates a ring-type membrane switch assembly disposed between the ring and the fuze housing to encode a multi-bit code to the electronic fuze corresponding the indicated number of that ring.