Patent GB-442432-A (GB)
Title: Improvements in coin collectors for telephone systems
IPC: H04M17/02
Filed: 1934-07-04
Abstract: 442,432. Automatic exchange systems. HALL, F. W., 21, Bolton Gardens, Earls Court, and HALL TELEPHONE ACCESSORIES (1928), Ltd., 70, Dudden Hill Lane, Willesden, both in London. July 4, 1934, Nos. 19700/34 and 4255/35. [Class 40 (iv)] [See also Group XVIII] In a coin collector for telephone systems of the kind in which a meter registers money inserted on deposit and is stepped back manually to register charges made against the deposit for calls, a manually operated pre-setting device is provided which short-circuits the transmitter and predetermines the amount the meter is to be stepped back, the short-circuit being cancelled by the charge registering operation. Deposit coins, shillings, are inserted through a slot A, Figs. 1 and 4, and a knob A3 rotated to rotate one sun-wheel B4 of an epicyclic mechanism and set forward a planet wheel cage B6 carrying a registering wheel C which is marked on its rim in multiples of twopence. These markings show through in window C1. In making a call, before dialling a button E is depressed twice to rotate a wheel F, the figures on the rim of which denote pence. The button acts by depressing a spring-loaded slide G, Fig. 3, and causing a pawl G<1> thereon to rotate a pin wheel G<2> which rotates two ratchet wheels H, J, the wheel H being fixed to the number wheel F. The ratchet wheel J is connected to a castellated wheel M by a spring J<3> which is accordingly wound up, the wheel M being held by a pawl K<2>. Pawls H<1>, J<1> brought into engagement with the wheels H, J by the raising of the receiver hook, hold those wheels in their set position. If the call is ineffective, the receiver is replaced, releasing the pawls H<1>, J<1> so that the wheels H, F are returned to normal position by a spring and the wheel J returned by the spring J<3> until a stop J<2> thereon meets a stop M<1> on the wheel M. If the call is successful, a button K and slide K<1> are pushed in to disengage the pawls H<1>, K<2>. The wheel H again returns to normal position, but the wheel M rotates until its stop M<1> meets the stop J<3>. The wheel M is connected to the other sun-wheel B<4>x of the epicyclic mechanism and the wheel C is stepped back an amount corresponding to the price of the call. The wheel F has a stud which in the zero position coacts with spring contacts to short-circuit the dial and in the rotated position actuates other contacts to short-circuit the transmitter. The downward movement of the receiver hook O through a lever P acting on a clutch Q<1> causes the spring of an escapement Q to be wound. The escapement controls contacts Q<2> for closing the line circuit with a slight time-lag. A stud X on the wheel C actuates contacts X<1> to notify exchange, when the deposit is exhausted. Extra charges for trunk calls are inserted through a slot R. A shilling strikes a bell S and a gong, while a sixpence strikes only one of these. A lever U is rocked by the insertion of an extra charge coin, and winds the spring of an escapement V controlling contacts W for effecting a circuit change. An arrangement, including a relay, may be provided to enable exchange to step back the wheel C to register rental charges ; or a separate moneybox for rent payments may be provided.