GB788821A - Electromagnetic pulse counter - Google Patents

Abstract

788,821. Counters. STANDARD TELEPHONES & CABLES, Ltd. Sept. 16, 1955 [Sept. 24, 1954], No. 26543/55. Class 106 (1). [Also in Groups XXXVII and XXXIX] In an impulse counting device of the type in which impulses fed to a common magnetic circuit operate a succession of armatures which thereupon remain operated, each armature controls a pair of springs whose contact-carrying ends are staggered in opposite directions, the contact sets so formed comprising contacts carried by springs controlled by adjacent armatures. Fig. 2 illustrates the spring sets controlled by armatures 5 and the formation of a contact set in the middle position using a righthand upper spring and a left-hand lower spring. Some springs have been omitted at the sides for a clearer illustration of the shape of the springs. As shown, Fig. 3b, an initial break contact set 100a, 100b is provided with a fixed lower spring 100b. This contact set is opened by the raising of the spring 100a by the operation of the first armature 501 on receipt of the first impulse and remains open thereafter as an off-normal indication. Operation of the first armature also raises spring 101b to make connection with contact spring 101a. On the next impulse armature 502 operates and raises spring 101a which is thus disconnected from spring 101b, and spring 102b is raised into contact with spring 102a and so on. The last upper spring 110a is fixed.