Patent GB-105966-A (GB)
Title: Improvements in connection with Automatic Telephone Systems.
Inventor: BURRELL WILLIAM ALFRED
IPC: H04M17/02
Filed: 1916-05-03
Abstract: 105,966. Burrell, W. A. May 3, 1916. Hiring telephones; coin action, thrust and mechanical connexion. - In a coin-freed sub-station apparatus for use in automatic exchange systems, the receiver and selector are put into circuit with the line by pressing a coin into a hand-operated rocking-frame; the insertion of the coin also serves to free the frame, which, when rocked in one direction effects the return of the coin, and when rocked in the other direction puts the transmitter into action, effects the discharge of the coin into the money box, and is looked in the displaced position until the receiver is replaced. The rocking frame comprises four vertical supports 25 passing through an operating shaft 13 and attached to a curved hood 22 provided with a coin slot. Disposed between the vertical supports are two coin-gripping levers 28, 55 connected by springs 58 and pivoted to a bar 43 secured to the rear supports. A sliding bolt 20 mounted in the rocking frame and connected to the gripping-lever 28 normally engages in a socket in a fixed part 12 of the framework. When the receiver is removed, a shaft 31 connected to the receiver hook turns into the position shown in Fig. 4 and is retained in this position by a spring 35 which engages a pin 34 projecting from an arm 33 on the shaft. The caller presses a coin through the slot in the hood between the gripping-levers, thereby moving the gripping-lever 28 to the left and withdrawing the bolt 20, and simultaneously throwing over a lever 61 which closes spring contacts 7, 8, the lever 61 being retained in this position by the engagement of a spring catch 66 with a catch 62 on the shaft 31. Contacts 7, 8 being closed, the receiver can be used but the transmitter is short circuited through contacts 9, 10. The caller then sets the indicator disk and, having obtained the desired connexion, rotates the spindle 13 so as to move the lower part of the rocking frame rearwardly, the coin 67, Fig. 6, working over a curved supporting plate 45 and depressing an upwardly projecting arm 50, thereby rotating a spindle 47, an arm 48, Fig. 1, on which presses down the contacts 9, 10; during the latter part of the movement of the rocking frame, the bar 43 turns a lever 64 to bring a catch 65 into engagement with the lower contact 10, and the coin is moved off the plate 45, and discharged to the money box by the action of the gripping-levers, whereupon the lever 48 and contact 9 return to the normal position, the plate 43 being slotted at 44 to accommodate the arm 50, so that the transmitter is now in action. A catch 37, Fig. 4, on the shaft 13 engages a catch 36 on the arm 33 and retains the rocking frame in the displaced position. All the parts are returned to their normal positions when the receiver is replaced. If the desired connexion cannot be obtained, the operator rotates the spindle 13 in the reverse direction so that the coin is discharged over the front edge of the plate 45 into a return shoot. Testing coins.-A claw 53, Fig. 6, is pressed into engagement with the concave face of a cam 54 on the gripping lever 28 by a spring-controlled spindle 51, and co-operates with a feeler 56 which is mounted on the same spindle and is pivoted to a blocking lever 57. If a washer is inserted, as the gripping-lever 28 moves to the left, the claw 53 is moved forward into the hollow portion of the cam face, since the feeler 56 can enter the central hole of the washer, and the blocking lever 57 passes beneath the washer and prevents its descent. When released, the washer is partly projected through the coin slot by the curved surfaces 60 of the gripping-levers.