Patent GB-191403195-A (GB)
Title: Improvements in or relating to Telephone system.
Filed: 1914-02-06
Granted: 1915-02-08
Abstract: 3195. Automatic Telephone Manufacturing Co., and Savin, J. Feb. 6 Hiring telephone apparatus; coin action, weight; coin action, mechanical-connexion.- Relates to telephone systems in which substation coin collectors are rendered operable by the calling party or in some cases by the called party, after but not before the current on 'the line has been reversed by the operator or by the reply of the called party, this reversal rendering the sub-station speaking instruments inoperative until the party restores the circuits to their normal condition by inserting a coin. A modified form of apparatus is described which is adapted for use at a sub-station at which two kinds of calls are received, namely calls, such as full-automatic calls in which the line current is reversed, and calls in which the line current is not reversed, the insertion of a coin being necessary in each case. The coin-collector shown in Fig. 1 is of the kind described in Specification 687/12 in which, when the line current is reversed, a polarized relay 14 moves a trigger 18 so as to short-circuit the microphone 8 and shunt the receiver 7 with a resistance 63, the trigger 18 being tripped by the insertion of a coin in the shoot 24. The relay 14 is provided with an additional contact 23, which connects a buzzer 25, shunted by a resistance 26, to the line 48, and thus shunts the supervisory relay 42 so that this lights the calling supervisory lamp 40 until the coin is inserted at the sub-station. In the modified arrangement shown in Fig. 3, suitable for use at coin-box stations in which two kinds of calls are received, as previously explained, the polarized relay 70 is provided with contacts for short-circuiting the telephone instruments, as before, and may be provided with additional contacts 87, 88 for connecting the buzzer 86 to the line. The coin is deposited in a carrier 74 mounted on a rotary shaft loosely carrying a disk 80 and cam 81, which by closing contact 83 connects the buzzer 86 to line and by moving lever 84 trips the trigger 85. After inserting the coin, the subscriber rotates the shaft so as to turn the coin upside down, the portion of the coin, which fills the notch 75, engaging a catch to prevent backward rotation of the carrier, and closing contact 78 to shunt the microphone. The portion of the coin which fills the slot 76 engages a pin 79 in the disk 80 and thus rotates the cam 81. When a manual call is received without reversal of the line current, the polarized relay 70 does' not operate the trigger 85, the insertion of the coin being notified to the operator by the connexion of the buzzer 86 over contact 83 to the line. When an automatic call is made, the reversal of the line current causes the relay 70 to shunt the speaking instruments, this shunt being removed when the trigger 85 is tripped by the lever 84. If the springs 87, 88 are provided, the connexion of the buzzer 86 to line serves not only as a reminder to the calling subscriber to deposit a coin, but also as a notification to the called subscriber that the calling station is a - coin-box station. The Provisional Specification describes a construction of coin collector in which a coin inserted at any time, except when the polarized magnet is energized by the reversal of the line current, is returned to the subscriber.