Patent GB-384752-A (GB)
Title: An improved coin checking device for coin freed telephone installations
IPC: H04M17/02
Filed: 1931-10-29
Abstract: 384,752. Exchange systems. MOSER, O., 53, Tillierstrasse, Berne, Switzerland. Oct. 29,1931, No. 29991. [Class 40 (iv).] In a coin-freed system, the sub-stations are provided with impulse transmitters set when a coin is inserted and released when the coin has been tested to send impulses corresponding to the value of the coin. In automatic working, the impulses are checked against the numerical impulses and, if correct, a point in the connection is switched through. In manual working, the operator is given a number of buzzer signals in accordance with the impulses transmitted. Construction of coin-freed mechanism, Figs. 1 and 2. A number of coin slots are provided for various coin values and when a coin is inserted it bears on a member a pivoted to a lever b carrying a toothed sector c which is thereby rotated against a spring d to rotate a pinion e which winds up a spring in drum g through pawl-and-ratchet mechanism. After successfully passing the tester Mp, the coin moves a lever, say h, so that pin 2 comes under part q of the upper one of the impulse springs shown, and lever r on the shaft of lever h releases cam s. The impulse wheel n is then rotated by the spring drum but the first three recesses in the impulse wheel are ineffective for sending impulses since the upper impulse spring is held up until lever h is moved back by pin m on the impulse wheel. Two impulses are thus sent out. Similarly, one impulse is sent out for a coin engaging lever i, but five impulses are sent out for a coin engaging lever k since this lever does not interfere with the operation of the impulse springs. Levers h, i, k are mounted on the same shaft, h, i by pin-and-slot connections and k rigidly. The coins after passing through the shoot rest on a pivoted flap K (dotted position, Fig. 3) until the switch hook H is released whereupon they drop further against a hook extension H1 and rest against a flap W until it is determined whether they shall pass into the coin box MK or be returned by passing to MA. Automatic system, Fig. 3. The impulse springs is of the coin box are connected across lines L1, L2 and relay IM repeats the impulses to magnet DMW of auxiliary switch MW. Relay B, which is sluggish, does not pull up. The calling party now removes his receiver and IM pulls up followed by B. The first train of dialled impulses is repeated to magnets HGW and DTW of the group selector and an auxiliary switch TW in parallel, the group selector hunts for an idle outlet, and switching relay P completes one point in the speaking path. The banks MW and TW are cross connected in accordance with the required fees and if MW has been properly set by the coins, D pulls .up and switches through. Further impulse trains are repeated over im4 and when the called party replies Z pulls up. When the calling party hangs up, IM falls back and S pulls up to connect battery over line L2 to magnet Sp the circuit of which is completed to ground over a switch-hook contact HU. Magnet Sp trips the flap W to pass the coin M into box MK. The switch-hook contacts and extension H1 are arranged so that the coin drops before H1 is completely withdrawn, and the movement of the switch-hook may be damped. Manual system, Fig. 4. In this system, the calling party removes his receiver before inserting the coins. Calling lamp AL is lit by relay AR and the operator answers with plug St, throws switch S, tells the party the coins to insert and to replace his receiver. The switch S completed circuits for magnets K1, K2 which. moved holding pawls HK1, HK2 of switches MW, TW into operative position. Impulses from the coin springs is are repeated by relay IM to magnet DMW to set switch MW. The operator now throws switch U to ring the calling party and operates switch N to energize relay H which connects interrupter LU to magnet DTW. Switch TW is stepped until it corresponds with. MW, whreeupon P pulls up and opens the driving circuit. During the stepping, wiper b connects pulses from a buzzer SU to the operator's receiver TB so that she may ascertain if the correct coins have been inserted. Switches. S, U, N are restored and switches MW, TW release.