GB567633A - Improvements relating to the counting of electrical impulses - Google Patents

Abstract

567,633. Electric signalling systems. SIEMENS BROS. & CO., Ltd., and LONG, D. P. Dec. 10, 1943, No. 20733. Addition to 471,987. [Class 40 (i)] [Also in Group XXXIX] In a relay counting chain in which the operation of each counting relay shortcircuits the impulse repeating relay and thus terminates the impulse, as described in the parent Specification, the impulse repeating relay is held locally in the charging circuit of a condenser while an impulse is being transmitted in order to guard against its release during the operating period of a counting relay. The non-inductive resistances shunting the counting relays which were previously provided for the same purpose are dispensed with. In Fig. 1, the repeating relay X is normally energized over resistances LR, HR, and is switched into the impulsing circuit when the impulsing contacts p change over, a charging circuit for condenser or in series with the relay being completed at the same time. When the counting relay A, for example, energizes, it short-circuits relay X at contact a<1> before transferring the impulse circuit at contacts a<2> to the next relay of the chain. In a modification, Fig. 3, relay X is provided with a second winding of high resistance in series with condenser Q. In Fig. 2, relay X is energized by the operation of contacts p and the impulse circuit is completed when they restore the. charging-circuit for condenser Q through relay X being made as before. Specification 462,773, [Group XXXIX], is referred to.