Patent GB-173641-A (GB)
Abstract: 173,641. Automatic Telephone Manufacturing Co., Ltd., and Savin, J. Oct. 21,1920. Metering and time-controlling systems. - A contact in the metering-circuit has its operating- member mechanically coupled to a regularly-moving member, upon the response of the wanted party, to operate the meter a predetermined number of times. Means may also be provided forrepeating the operation of the meter after predetermined intervals of time, for effecting the release of the connection after a predetermined time, and for giving a warning signal prior to the further operation of the meter or to the release of the connection. The Figure shows an arrangement associated with a repeater H. When awaiting the response of the called party, the release conductor B is grounded through armature 14 of release relay 12, and contacts 16, 17, 19. During the setting up of the connection, booster impulses transmitted over the conductor 21 cause the magnet 22 to step round the wipers 24, 25 of a switch S a number of steps corresponding to the charge to be made. The contacts 28 of the wiper 24 are connected to sets of contacts controlled by cams 30 - - 33 on a continuouslyrotating shaft. Once during each revolution of the shaft, a cam 34 causes the energization of a magnet 40 which advances a shaft 41 one step. The energization of the relay 10, due to the wanted subscriber replying, energizes the relay 43 which locks itself over the armature 70 and couples the shaft 41 to drums 18, 20, 47 by means of a jockey pulley 46. These drums normally rest as shown with a pin 49 held against a stop 48 by the spring 50. The stepping-round of the shaft 41 causes the pin 51 to open the contact 16, 17, and to close a connection for the release conductor 13 over the springs 16, 52, wiper 24, and springs 54, 53 to earth. During the succeeding revolution of the continuously-rotating shaft, a predetermined number of booster impulses, for example, three, are sent over the springs 56, 54 to the release conductor 13 for the operation of the meter. At the end of this revolution, the pin 51 moves out of contact with the spring 52 and the earth-connection over springs 16, 17, 19 is restored. In order to make one or more further charges after given intervals of time, further projections 58 on the drum 18 may cause the operation of the meter in the same manner. In order to break down the connection after a certain time, the cam 65 separates the springs 19, thus removing earbh from the release conductor 13, the step-by-step switch S being restored to normal by means of a circuit over release magnet 68, wiper 25, and armatures 67, 66. Prior to the breaking of the connection or to making a further charge, a warning signal may be sent over the line 27 by a cam 59 closing a contact 60 in the circuit of a @one signal device 63. When it is desired to operate the meter once only, the springs 16, 17, 52 may be replaced by springs similar to 53 - - 56. In place of the impulse machine shown, which is common to the exchange, the metering contact might be opened or closed according to the number of pins on a drum adapted to be coupled to a regularly-moving shaft. Specifications 169,768 and 172,995 are referred to.