GB221316A - Improvements relating to relay devices for use in automatic telephone systems - Google Patents

Abstract

221,316. Siemens Bros. & Co., Ltd., and Humphries, H. E. July 16, 1923. Order apparatus.-In a relay chain in which relays are energized one by one in response to impulses to mark circuits or make circuit changes, when a relay is energized, the next succeeding relay becomes connected up, but is short-circuited over the impulse - contact until this changes over at the - next impulse. Figs. 1 and 3 show an arrangement in which the impulse contact k causes battery and earth to be - connected in turn over the lead l to the relays A, B, C which are connected alternately to earth and battery. At the first closure of contact k relay P energizes over winding 1 and locks in - series with winding 1 of relay Q which is short-circuited until contact k opens, and then operates. At the next closure of contact k relay Q locks over winding 2, while winding 2 of relay P is connected up in opposition to winding 1, so that this relay relapses. Relay Q falls back when contact k opens, and the operation is then repeated. The operating lead l is thus connected over contact p<3> alternately to battery and earth. At the first impulse, relay A energizes, lacks, connects up lamp L<1> and connects lead l to relay B, which is shortcircuited until lead l is earthed at the next impulse, when it energizes, locks, connects up lamp L<2> in place of lamp L<1> and connects lead l to relay C. Modifications of this arrangement are described in which each relay cuts out the preceding one. The operating lead l may alternatively be connected up over a line switch having alternate contacts connected to battery and earth. Fig. 7 shows an arrangement in which a relay is energized at the opening of impulse contact k<1> and the succeeding relay is connected up by the release of the preceding relay at the next closure of contact k<1>, but is short-circuited over this contact. The first closure of contact k<1> energizes start relay A, which connects up winding 1 of relay B, which is short-circuited until contact k<1> opens. Relay B then operates and locks over both windings in series with relay A. At the next closure of contact k<1>, relay A is short-circuited and releases, and relay B remains locked over winding 2. Winding 1 of relay C is thus connected up, but is short-circuited until the subsequent opening of contacts k'. Each relay controls one of a set of lamps L', L<2>. In a modification of this arrangement suitable for rapid impulsing, each relay is provided with a third releasing winding which opposes the holding winding. The use of a start relay is also obviated.