Patent GB-167204-A (GB)
Title: Improvements in electrical apparatus for transmitting indications to a distance
IPC: G08B5/22
Filed: 1920-02-19
Abstract: 167,204. Bulle, M. P. Favre-, and Lavet, M. J. Feb. 19, 1920. Order apparatus.-In signalling systems of the rotary-field type, the stator of the receiver is made in three parts, each of which is wound as a straight bar with saw-cuts and finally bent into an arcuate form. When direct current is employed, the rotor consists of a permanent magnet mounted upon a spindle upon which is frictionally-mounted a fly-wheel operating as a damping-device. When alternating current is employed, soft-iron pole-pieces are attached to a magnetic spindle surrounding a fixed magnetizing-coil. The system may be applied to a bell signalling system for a number of substations, the central station being provided with separate indicators for each substation and a single order apparatus common to all the stations. The substation is provided with a bell for acknowledging the receipt of the order. Transmitter. The transmitter D, Figs. 3, 5 and 6, consists of a contact-plate 11 on one side of an insulating-plate 14, contact plates 12, 13 insulated from each other on the opposite side of the plate 14, lead terminals 7, 8, 9 carrying spring-mounted conical brushes 19<a> adapted tc engage recesses 20 in the plates 12, 13, a lead terminal 5 the brush 17 of which engages the pivot of the plate 13, and a lead terminal 6 connected to the plate 11 through a spring contact 18 and the casing 4. The terminals 5, 6, 7, 8, 9 are split and the plugs engaging them are soldered to the leads. The plate 14 is rotated by means of a handle 1. The plates 11, 12 are connected by two conductors 20<1> in order that the plate 12 may be connected to the negativepole of the battery through the plate 11, casing 4, contact 18, and terminal 6. The positive pole of the battery is connected to the terminal 5, and the terminals 7, 8, 9 are connected to three equally-spaced points on the stator of the receiver. Receiver. The stator of the receiver R is made in three sections, each of which consists of a normally straight rod 22, Fig. 9, provided with saw-cuts and covered by a rubber tube. The rods are wound separately and finally bent into arcuate form as shown in Fig. 10. The stator 23, Fig. 11, is mounted concentric with a permanent magnet 29, the spindle 30 of which is mounted in a bearing 31 and a bearing 32 mounted on the glass screen 26. The spindle 30 carries an indicating-needle 33 and a fly-wheel 34 is mounted frictionally upon it to serve as an inertia brake for damping purposes. When alternating current is employed the permanent magnet 29 is replaced by two soft-iron plates 37, 38, Fig. 14, connected to the axle 36 surrounded by a fixed coil 39 supplied with alternating current. Circuit connections. The circuit connections between the distributor D and the receiver R are shown in Fig. 13. An audible alarm V, a junction box Q, and a control switch u are also shown. To signal, the switch u is closed toenergize the bell V and the distributor D is operated to control the receiver R. A multiple substation system is shown in Fig. 17. When the operator at the substation 2 wishes to communicate with the central station, the switch B<2> is .closed to energize a bell S and an indicator V2. The distributor T2 is operated to transmit the order, which is repeated at the receiver R when the central-station operator closes his switch C2. A bell S2 at the substation acknowledges the receipt of the order.