Patent GB-338273-A (GB)
Title: Improvements in electrical signalling systems, particularly applicable to totalisators
IPC: A63B71/06
Filed: 1929-09-21
Abstract: 338,273. Ericsson Telephones, Ltd., Limb, F., and Lyden, T. Sept. 21, 1929. Totalizators.-In a signalling system in which switches which step together over parallel circuits are arranged at each end of the junction so that when one switch reaches a marked contact the other switch extends the junction to a corresponding outlet, the synchronous stepping of the switches is ensured by the addition of capacitance and inductance to the operating circuit of one of the magnets. Should the two switches become out of phase, the second switch continues to step after the first switch has reached the marked outlet until the two switches are again in phase. The system is described as applied to a totalizator of the type described in Specification 340,280, 340,288 and 340,289 [all in Group XIX]. The apparatus shown to the left of the junction AA-AD is situated at the betting booth whilst that to the right of the junction is at the central station. The switch A has outlets connected to keys BK, representing the different competitors, and its wipers are connected over a junction AA-AD to a switch B whose outlets such as 4 connect with switches RA, allocated to the individual competitors, which control associated registering switches such as UA. Switches UA, step each time a bet is accepted. When a key such as BK1 is operated relays E and F operate and lock and C pulls up (a3, AB, RG). Relay G energizes and magnets A and B set their switches under control of interrupter contacts a1, the speed of operation being slowed by condenser P and impedance N to ensure correct operation of B. When a3 engages, the marked contact M pulls up breaking the circuits of A and B and completing circuits for K and slow operate relay L. If A and B are in corresponding positions a4 and b3 connect equal potentials to the opposing windings of G and this relay releases. If the potentials vary, G remains energized and L operates re-energizing B. B and L interact until the switches A and B agree when G releases. A circuit is thus completed over AB and 4 for .relay LA and if RA is not standing on the calling circuit, the switch steps by self interruption until the marked line is reached when CA energizes breaking the circuit of RA and operating CXA to energize UA. When UA pulls up, resistance RH is put into the circuit AB, 4 in parallel with LA and CA and the current flow is now sufficient to energize D (Fig. 1). The circuits of E and F are broken but DA pulls up and the ticket machine motor JA starts to print and issue a betting ticket and to release BK1. The release of relay E allows D, LA and CA to fall away, de-energizing CXA to release UA. Switch UA steps one step and with SA controls the reading of an indicator. The release of F deenergizes M which completes homing circuits for A and B. The release of M de-energizes K, and G re-energizes and remains operated to guard the apparatus until A and B have restored to normal. The ticket machine motor JA and relay DA are held operated over da1 but this circuit is broken by cam CM when the motor has nearly completed its operation freeing the machine for further use. At the termination of betting, key KH is operated releasing SA and allowing UA to move to its next home position. An alarm AL may be arranged to operate if relay G is held energized for an unreasonably long period.