Patent GB-298216-A (GB)
Title: Improvements in or relating to coin freed telephone apparatus
IPC: H04M17/02
Filed: 1928-04-21
Abstract: 298,216. Cambay, C. A. Oct. 6, 1927. Coin-freed systems. - A coin-freed telephone apparatus is provided with two shoots 6<b>, 6<c>, Fig. 6a, the first 6<b> being normally open and receiving a coin in payment for an urban call, while the second 6<c> is only opened after the insertion of a coin in the first shoot and receives an additional coin for a suburban or other call. The first coin drops down a shoot 6, Fig. 8, and tilts a lever 7 to release a pivoted piece 49 which is rotated by a spring 50 to disengage a hook 48 from a lug -16a on a vertically sliding plate 16. A member 47, through which the receiver hook passes is pivoted at 46 to the plate 16 so that the plate rises when a coin is inserted and the receiver is lifted. A pin 54a, Fig. 7, on the member 47 also releases a, pivoted piece 51 which is rotated by a spring 52 so that a finger 50 thereon projects into the shoot 6 and prevents another coin from descending, when the receiver is unhooked. The movement of the member 47 through a rod 56 controlled by springs 58, 58<a>, and a link 55 moves a flap 54 to cover the shoot 6<b> and open the shoot 6<c>. The coin or coins, according to the call required, drop to two pins on a pivoted balance 13, Fig. 10. If the call is ineffective, the receiver is hung up and a spring- controlled member 57 pivoted to the slide 16 engages a pin 30 on the balance to tilt this and return the coins to an outside tray 6<a>. If the call is effective, a reversal of current is produced in a magnet Fig. 16, to release a plate 59 which rises under the action of a spring 59<a>. An incline 60 and groove 60<a> on this plate act on a pin 31 to tilt the balance 13 in the opposite direction and discharge the coins to a position where they are held between a fixed projection 61 and a lever or levers 62. When the receiver is hooked, an incline 16<b> on the slide 16 actuates a lever 64 which pushes the coin or coins past the levers 62 to a money-box. The plate 59 is normally held in its lower position by a rod 83 thereon being engaged by a hooked catch 82<a> carried by the armature 80 of the magnet 58. A lug 16<c> on the slide 16 by acting on a rod 90 ensures the relocking of the catch 82<a>. A rod 88, Fig. 3, carried by the plate 59 actuates a cam 87, which operates contacts 84, 85, 86 to short circuit the magnet 58 during conversation. In the case of a suburban call, the coin inserted in the shoot 6<c> acts on a pivoted piece 78 to move a central blade 76, Fig. 3, from a contact 74 to a contact 75, thereby putting an auxiliary microphone 72 into circuit, so that the sound of the coin striking a gong 73 is transmitted to exchange and signals that the additional payment has been made. The piece 78 also depresses a rod 80, which rocks a pivoted lever 86 against the action of a spring 87. If the suburban call is effective, the rise of the plate 59, through a projection 59<b> acting on a collar 80a, returns the rod 80, thereby shortcircuiting the microphone 72. If the call is ineffective, a step 16<d> on the slide 16 acts on the lever 86 to return the rod 80, when the receiver is hung up. A device for signalling exchange, if a wrong number has been given, comprises a button 98, Fig. 13, which is repeatedly pushed causing rapid make and break of contacts 102, 103 in the circuit of a supervision lamp. The push 98 has a sharp edge 100 which acts against a small roller 101 carried bv the contact blade 102 so that the circuit is made momentarily only. Preventing fraud. A second call without prepayment by depressing the receiver hook slightly is prevented by a catch 94 being tilted by the rise of the plate 59 so that it comes over a pin 95 on the slide 16. If the slide is depressed slightly the catch 94 prevents it from returning thereby rendering impossible a second call without payment. Metering payments. The levers 62, Fig. 10, past which the coins are pushed to the money box, through rods 68, 69 actuate counters 70 registering the numbers of urban and suburban calls respectively.