Patent GB-334351-A (GB)
Title: Improvements in and relating to electric circuit arrangements for signalling installations, indicator boards, and the like
IPC: H04L12/18
Filed: 1929-08-02
Abstract: 334,351. Lorenz Akt.-Ges., C. April 15, 1929, [Convention date]. Selective signalling-apparatus.-In a signalling system for displaying simultaneously a. number of indications, the indicating members are simultaneously set by switching mechanisms controlled by a series of current impulses which are limited by a single selector and co-operating bank of contacts operated at the same time as the switching mechanisms. In the construction shown, the invention is applied to a stock-exchange installation and means are provided for indicating the kind of stock and the first, current and closing quotations thereof. Each quotation, given by three figures and a fraction, requires five number drums and in addition a further drum showing the tendency of the stock, is provided. Each stock therefore requires eighteen number drums and corresponding switching mechanisms, a few of which only are shown. Keys such as Ta, Tb are provided for indicating the kind of stock and keys 1, 2 and 3 indicate the nature of the quotation. Keys Ta and 1 are normally open, but key Ta is closed if any of the other keys such as Tb is pressed open, and key 1 is similarly closed by the opening of key 2 or 3. Assuming, for example, that the closing quotation of stock corresponding to Tb is to be indicated, keys Tb and 3 are pressed so that contacts Ta and 1 are closed, whereby circuits through relays F and A<2> are closed by way of switching arms da, da. Relay F, through contact 16f, lights lamps KL to indicate to the operator that he can commence adjusting the figures of the particular stock. The operation of relay A2 effects the successive operation of relays A3, A1, J, the latter through contact j1 closing circuits through rotary magnets Da, Db. The magnets cause their switching arms da, da1 &c. db, db1, &c. to advance one step. The relay A1 acts through contact 12a1 to open the circuit of relay A2. A2 similarly de-energizes relay A3 and A3 deenergizes A1. When the switching arms have been moved a step forward, a circuit is again closed for relay A2, so that the switching operations are repeated, and continue until the arms da1, db1 reach contact 6. In this case since keys Tb and 3 are both open the circuit for relay A2 cannot be closed, so that no further movement of the arms takes place and the number drums for indicating the closing quotation of the stock corresponding to Tb are thus selected. Assuming that the value of the stock to be signalled is 731¥, keys closed in accordance with this figure are selected from rows of keys I to V which are adapted to be connected' to lines terminating as shown in a bank of contacts associated with a wiper d. Z1 and Z2 are mechanisms for indicating respectively the hundreds and tens of the selected number. The other indicators in respect of the units, &c., are not shown. The operator presses key ET which has contacts ET1, ET2, and closes a circuit through the winding of magnet D, contact 27v, closed contact ET1 and release key contact AT2. The winding is energized and switches the arm d one step forward. The key ET2 closes a circuit through relay E which locks up and closes a circuit for relay V. This relay operates various contacts, one of which contact 31v moves to light lamp KL1 which indicates to the operator that the adjustment of the number drums is being commenced. Contact 13v closes a circuit through relay A2 which effects the successive operation of relays A3, A1. These three relays interrupt each other and the opening and closing of contacts 39a1 of relay A1 affects a circuit through the winding of magnet D, so that the switching arm d moves stepby-step over its bank of contacts. The indicating mechanism Z1 moves in accordance with the switching arm d as it is stepped by means of a magnet M1, the circuit of which is affected bv another contact of relay A1, viz., 24a1. The mechanism Z2 is similarly operated. The magnet M1 receives impulses until the arm d reaches contact 7 which is associated with a pressed key in row I. A circuit is then closed through relay PI which locks up through contact 2p1, and at contact 8p1 opens the circuit for magnet M1 The mechanism Z1 therefore stops at number 7. The other indicating mechanisms are similarly operated during the time that the arm d moves over its contacts. When the arm d reaches its normal zero position, relays V, E and the magnet D are released. When the operator presses key AT with contacts AT1, AT2, the number indicated is caused to disappear, as the magnets M1, M2, energized through circuits including respectivelv contacts k1, k2, step round the indicating mechanisms until they reach normal zero position when contacts k1, k2 are opened.