Patent GB-470332-A (GB)
Title: Call registering substation telephone sets
IPC: H04M15/28
Filed: 1936-02-03
Abstract: 470,332. Metering. GHOSH, A. K. Feb. 3, 1936, No. 3178. [Class 40 (iv)] In a system in which the subscriber must operate a meter before a call can be set up, means being provided for setting the meter back (or for operating a separate rebating meter) in the case of ineffective calls, means are provided for automatically breaking the rebating circuit when the meter has been set back (or the rebating meter has been operated). The invention is described in detail with reference to a manual exchange system. A similar arrangement can be used in an automatic exchange system, additional means being provided to lock the dial if desired and certain of the switch contacts, e.g. those concerned with signalling the operator, being omitted. Since the arrangements provide for the answering of incoming calls in the usual way, the meter operating means may be locked to prevent calls from being established in the subscriber's absence while allowing calls to be received. Outgoing calls. On the removal of the handset, the line circuit is completed momentarily by apparatus 105 through an indicator 107 to show whether the line is in. order or not. The line circuit is not completed permanently until the operation of the metering button 17 which causes the withdrawal of a latch 14 controlling a rod 11a which then rises and completes the line circuit at 13. On its return movement the button is latched by a spring member 110 controlled by rod 11a so that the meter cannot be actuated. more than once. Moreover, the metering button can only be actuated when the handset has been removed and the end of rod 16 thus finds a hole 6 in the pillar 2. Incoming calls. In this case the line circuit is completed by a switch 35, 37 which is enabled to close after the handset is removed by the next ringing period which actuates 34 to remove a latch 36. At the same time the metering button is latched at 116 to prevent metering during such calls. Flashing the operator. This is only possible on outgoing calls and hence indicates to the operator that the meter has been operated in case, for example, of a wrong number when a new call is to be given without fee. Flashing is controlled by a push-button 52 which in connection with switches at 51 and 53a causes momentary interruptions of the line, the duration of interruption being independent of the manner of actuation. The push-button 52 is latched at 67a if the metering button has not been operated. Rebating arrangements: On receiving information that there is no reply or that the number is engaged, the subscriber rotates rod 41 to bring a hole 67 into register with a switching member 65 which is then moved by a spring so that switch 63 is opened and switch 64 closed. At the same time, 52 is latched against further operation. The meter-resetting circuit is thus connected across the line and the handset circuit is broken. The busy &c. signal preferably comprises a component for actuating the resetting magnet 28. After a single operation, the armature is held by a permanent magnet 30 and at the same time the resetting circuit is broken at 93, 94. The armature . remains in this position until the next actuation of the metering button when it is pulled off by the lever 31. In case an automatic indication is not given, the subscriber in response to an instruction by the operator depresses the pushbutton 52 far enough to actuate the switch 55a, 56. The latter remains latched by the member 58 which also breaks the handset circuit at 58a. The circuit changes are thus identical with those caused by rotating the push 52. The operator receives a signal that the button has been depressed as described in the preceding paragraph and applies a booster impulse to the line to reset the meter. A local gong-signal is given at 27b when the meter is reset. Restoration to normal. Projections 3, 4, 5, 7 on the cradle supporting rod 2 restore all apparatus to normal when the handset is replaced.