DE304967C - - Google Patents

Description

IMPERIAL

PATENTAMfI

Connecting lines, d. H. Lines coming from a larger group of call stations can be used optionally are currently heavy telephone traffic usually to the utmost, so that it is necessary to focus on the individual conversations no time to keep this connection line occupied if possible abbreviate. This is done initially through

ίο automatic forwarding of the final character, as a result of attaching the telephone set on the part of the intercom, at both ends of the connection lines. But despite this measure remains the time the connection line is busy depends on the quality of the service. This inconvenience is most pronounced with poor operation of the one facing the intercom Side of the connection line felt because this caused a call from the opposite side meets the still existing connection and directly to one Intercom has arrived.

There are now versions known which. strive to eliminate this deficiency.

In place of the activity of the operator, there are, as far as possible, automatic ones Switching elements set.

The 'currently known versions, depending on the attachment of the Remote receiver of the call station, automatically disconnects the existing connection simultaneous establishment of the rest position of the system used or without establishment this rest position. In both cases it is not possible after the separation has occurred to re-establish the connection by picking up the receiver of the intercom again. So there are, for the purpose of emitting flicker signals, delay devices required, which only the separation let it enter after a certain period of time.

As far as it is now about separation devices, which the rest position is not establish itself automatically, the time of the occupation becomes due to the necessary delay the connection line is extended by the delay time, and there are costs and Sources of error caused by the delay device without the. Advantage of a work relief the operator would be gained.

If, however, the rest position is brought about at the same time as the disconnection, there is a risk that a new connection can be established on a connecting line before the old connection is disconnected on the other side of the connecting line. This can ^aue r of the delay can be prevented only by a longer D, and that this must be so large sized such that the connection can be separated on the opposite side of the connecting conduit during normal operation in the until the occurrence of separation elapsed from the attachments of the microphone unit time can. During this time, however, the connection can also be made on the side of the connection line facing the intercom.

■■■ **> :.

be separated by hand in the usual way, d. H. the initially specified value of the automatic separation has only sunk to relieve the operator's workload.

The purpose of the above invention is now to determine the time for the trunk to be busy to the slightest extent, that is the time of making the connection

ίο and reduce the duration of the conversation, while avoiding the costs incurred by the delay device and sources of error:

The enclosed circuit drawing shows an embodiment of the innovation.

The mode of action is briefly as follows:
After an inquiry has been made on the basis of an incoming call, the key VS is actuated and the flap AK is erected.

The actuation of the key FS causes the through connection (connection line with the Intercom) as well as a disconnection of the calling organ of the connection line by means of the Contact 1, as well as the connection of the battery

25, terie to the winding of the relay HR and to the lamp UL through contact 2. The latter lights up because it: on the other hand, is connected to earth via contact 5 of the relay SR. As soon as the microphone unit picks up, its supply current flows through relay SR, which energizes it. This interrupts the earth feed to the lamp UL and connects earth via contact 6 to the winding of the relay HR . The lamp UL goes out, relay HR picks up its armature and applies a battery to the winding of relay TR via contact 4 '.

During this entire time, as well as during the following duration of the call, the Through connection (connecting line-intercom) exist without interruption and that Call sign of the connection disconnected to make a new call (through-call) without useless Harassment of the switchboard to get to the intercom.

As soon as the microphone unit hangs up its receiver, the power supply circuit is interrupted, causing relay SR to drop out. The relay HR previously excited via contact 6 of relay SR is held via its own contact 3.

The following circuits are also established: earth, contact 5 of relay SR, lamp UL, contact 2, battery (the monitoring lamp lights up) and earth, contact 6, relay TR, contact 4, contact 2, battery (relay TR responds). By means of contacts 8 and 9, TR opens the line and by means of contact 10 it switches the call organ AK separated by the connection key VS to the line, so that a new call does not reach the telephone station but the exchange.

The connection line is therefore ready to take up a new call in the usual way and thus to be able to serve a new connection. The transfer of the final character to the other side of the connection line can take place independently of this in the usual way. The rest position is restored by straightening the connection key, as this causes the relays TR and HR, which are connected to the battery via contact 2, to drop out and the lamp UL to go out.

Without changing the inventive concept, the connection could be made in a known manner produced by plug and latch, as well as the opening of the line by means of a closing relay be brought about, which the latter, as well as the illustrated isolating relay, to can be used for other purposes.

Using an inductor incandescent call would primarily be one Disconnection of a holding relay required to switch on the call lamp by the Connecting elements require complete separation instead of the one shown in the circuit drawing of the calling organ. Choosing a different microphone unit would be similar, ζ. Β. one those with a condenser in front of the listener, only a corresponding switchover from do not involve parts that do not touch the concept of the invention. It can also be with the bringing about the opening at the same time in a known manner a conclusion about the Connection line are given.

Claims (4)

Patent Claims: 1. Circuit arrangement for telephone systems for automatic interruption 'of connections made via connecting lines, characterized in that the interruption and restoration of normal call readiness of the Connection line brought about by the subscriber and canceled again can, for the purpose of shortening the occupancy time and enabling the emission of flicker signals. 2. Circuit arrangement according to claim 1, characterized in that a relay [TR), which is controlled by the feed or monitoring relay, brings about the interruption and at the same time the normal call readiness of the connection line. · 3. Circuit arrangement according to claim 1 and 2, characterized in that the completed separation before returning the system to the rest position by the Civil servant by influencing the food or the monitoring relay (SR) can be canceled at any time by the intercom for the purpose of emitting flicker signals. 4. Circuit arrangement according to claim 1 to 3, characterized in that the relay [TR), which causes the opening of the line, can only be actuated when another relay (HR), which is in a known manner by the ~ take off of the handset of the call station is excited, is in the working position, for the purpose of preventing premature opening of the line. . 1 sheet of drawings.