DE186053C - - Google Patents

Description

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IMPERIAL

PATENT OFFICE.

PATENT LETTERING

- JV! 186053 CLASS 21 α. GROUP

Patented in the German Empire on July 6, 1906.

The invention relates to a circuit arrangement for traffic in a telephone exchange with subscriber stations (so-called extensions), which through switching a main office that can be called from the office - z. B. also the central switchboard an in-house telephone system - in connection with the office via the same line can kick. In particular relates

ίο the invention on an extension system, in which the extensions themselves give a final signal to the office at the end of the call by hanging up the handset (or more generally by interrupting one on the extension and the trunk line flowing current) can give and further - how this is often requested by the extension owner - the latter being someone else's call Participant previously reported by telephone, without listening to the other participant before it is connected to the exchange line through the main office.

In order to effect this secret message, according to the present invention, the The main unit's intercom from the exchange line, on which the same for answering of the office resp. of the other participant was switched, disconnected and with the line connected to the desired extension by simultaneously closing an auxiliary circuit which is the current flow over the exchange line when interrogating, which locks the final signal on the office, even after switching the intercom to the extension line maintains until the extension, if it wants to answer the call, with the trunk is connected, after which the auxiliary circuit is opened again. After that is - in a system with power supply of the subscriber microphones from Office off - the microphone of the extension or - in a system without such central power supply - an equivalent resistor in the same connection with the trunk line as before (when querying) the microphone respectively. the equivalent resistance of the main unit, and as a result a current flows which locks the final signal on the office over the line, which is expediently taken from a battery of the office. When you hang up the handset on the extension, the microphone or the equivalent resistor is switched off the line current interrupted and the now unlocked final signal on the office brought to appearance.

The opening of the mentioned auxiliary circuit when connecting the extension with the exchange line is expediently automatically either by a person who establishes this connection Speech switch or z. B. by

the handset hook of the main unit causes as soon as the latter after the connection has been established hang up the phone.

An embodiment of the invention is shown schematically in the drawing.

By means of a double line 1, 2 to which

A single line 5, the purpose of which will be explained later, and branch lines 30, 33 are the call devices of Office A - call relays 6, 7 with call lamp 8 and central battery 9 - with the speech switch U of the main station H in a known manner through choke coils 3, 4 and further via the same in its rest position (contact at 10 and II) with an electromagnetic call case flap 12 connected. The button of the speech switch is here in position 13. In the drawn central position of the button, the lines 1, 2 respectively. 33, 30 via the contacts 14, 16, 18, 15, 17, 19 and the capacitor 31 with the lines 20, 21 and further via the lines 22, 23 and the springs of a plug pawl 24 with the hearing and speaking apparatus 28 of the main station H connected, which is equipped in the usual way with a magnetic inductor i, alarm clock w, capacitor c, microphone m, receiver h, transformer t and receiver hook s . There is here the following speech connection between the intercom 27 of the officer who has plugged the connecting jack 26 of the main station H , which is in his place, and the intercom 28 of the latter:

Point 29 of plug cord 25, line 2, line 30, contact 15 of TJ, capacitor 31, contacts 17 and 19 of U, lines 20, 22, transformer t, contact 34, receiver hook s, lines 23, 21, contacts 18, 16 , 14 from U, lines 33 and 1, point 57, listener and transmitter from 27 back to point 29. Via this connection the main office H can be connected to the office A and also through the capacitors 32 of the plug cord 25 to the latter in the usual way connected other (calling) subscriber and, if the connection was requested from the latter, interrogate the same.

The microphone m of the main office receives power from the office battery 9 via relay winding 6, lines I, 33, contacts 14, 16, 18 from U, lines 21, 23, contact 34 on the receiver hook s, lines 22, 20, contacts 19, 17 from U, a relay 35 and earth.

The extensions TV ₁ , JV ₂ are in the for

central microphone supply usual way with alarm clock w, capacitor c, microphone m,

Telephone h, transmitter t and handset hook s and buttons / V ₁ , Ar ₂ and throttle and call windings 38, 39 usually connected to the line 5 via button. When the receiver h is picked up from the hook s , a current flows from the office battery 9 via the parallel branches 1, 2, the inductors 3, 4, line 5, relay 38, contact 37 from Ar ₁ , via in, s, contact 36 from Ar ₁ , reactor 39 and earth. This current causes the call dropper 40 to drop, thereby calling the main unit, and feeds the microphone in the sub-unit.

The calling extension JV ₁ is connected for interrogation by the jack 41 and plug cord 42 with the jack 24 and the intercom 28 of the main unit and, if a conversation with another extension N _{2 is} desired, connected via the cord 42 and jack 43 to N ₂ . On the other hand, if JV ₁ wants a conversation with the exchange, then after querying JV ₁ via 41, 42, 24, 28, the U ₁ key is pressed. As a result, JV _{1 is} connected via contacts 44, 45 to lines 46, 47, which via contacts 48, 49, 17, 16 and 15, 14 of the speech switch U (position 50 of the same, through-speaking position) to lines 30, 33 and I, 2 can be connected. In this case, current flows from battery 9 via relay winding 6, lines I, 33, contacts 14, 16, 49 of the speech switch U (position 50 of the same), line 47, contact 44 from Ar ₁ , receiver hook s, microphone m from JV ₁ , Contact 45 of Ar ₁ , line 46, contacts 48, 17 of U, relay 35 and earth back to the battery 9. This current flow excites - because one-sided - · the differential relay 6, 7, so that the call lamp 8 of the office lights up. After plugging the handle 26 on the office, the following speech circuit exists between the officer's speech set 27 and the extension JV ₁ : 29-2-3015-31 -17-48-46-45- £ -777-5-44-47- 49-16-14-33-1-57-27-29, which can be connected to the desired other participant via the capacitors 32.

The same supply and speech circuit exists if the connection was not requested _{from JV 1} , but in the opposite direction from another subscriber via the _{exchange with JV 1.} Here too, when speaking, the switch U is in position 50 and the Ar ₁ key is pressed.

This key is depressed in this traffic as soon as the main unit in the central position of the speech switch U has learned which extension unit is required. In the middle position of U is through the, as described, from 9 to 6-1-33-14-16-18-21-23-28 (^ w ^ -22-20-19-17-35 running food

Current of the microphone m the main body of the armature 51 attracted. However, since the isolating relay 52 from battery 9 is excited via the socket from 26 and lamp 53, the lamp 8 is de-energized. The lamp 53 likewise does not light up, since the resistance of 52 is selected to be correspondingly large.

If the button Ic ₁ is now pressed while U is in the central position (query position), 2V _{1 being} connected to lines 46, 47 via contacts 44, 45, according to the invention, a relay is simultaneously activated via contact 55 R connected in parallel to the speech set 28 of the main office. The relay R in turn separates the lines 22, 23 and the speech set 28 from the lines 20, 21 immediately by means of its armature, so that the speech set 28 no longer has a connection to the lines 30, 33 leading to the office, and switches it to the Lines 46, JJ um, via which now 2V ₁ - without the other subscriber connected via the office to the lines 30, 33 being able to overhear - called by means of the inductor i and the office call can be communicated to her. If the extension is ready for a conversation, it is by moving the speech switch U to the position 50 with the lines 30, 33 respectively. connected via this and the plug cord 25 of the office to the other participant. Here, as a result of the separation of the contacts 18, 19 from U, the relay R is de-energized again and the connection between the lines 20, 21 and 22, 23 is restored.

_{If the extension 2V 1} hangs on to the end of the call, it interrupts the call via 9, 6, 1, 33, 14, 16, 49, 47, 44, s, m, at 2V ₁ , 45, 46, 48, 17, 35 and earth flowing feed current of their microphone. As a result, the armature 51 drops on the office and switches a resistor 54 in parallel with the isolating relay 52, so that the lamp 53 lights up as a final signal for the office as a result of the increased current transmission. At the same time, a galvanoscope 58 or the like is switched on by the falling armature of the de-energized relay 35 via earth, contact 56 of Ar ₁ , lines 5 and 2, winding 7 and battery 9, whereby the main station receives a closing signal. The current-carrying winding 7 here is arranged in such a way that it does not exert an effect on the armature 51 alone.

In the embodiment described above, the auxiliary resistor R preventing the premature appearance of the final character 53 on the exchange is also designed as a relay which switches the speech set 28 of the main station H from the exchange line 20, 21 to the extension line 46, 47. This switchover can also be done manually by means of a special switch or directly by means of corresponding switchover contacts on the buttons Ar ₁ respectively. Ar _{2 can be} effected. Instead of a special winding R , the call sign 12 can then be used as an auxiliary resistor in the above sense.

By arranging the rest position of the speech switch U as a side position 13, it is avoided that the rest position is passed through during the transition from the interrogation position to the talk position (50), in which the relay 6, 7 become currentless due to interruption of the current flow in line 5, etc. and the tail lamp 53 of the office would temporarily give the wrong end signal. . .

The invention can also be used for systems without a central supply of the subscriber microphones. In this case, instead of the microphones m, which are then located in local battery circuits in a known manner, an equivalent resistor is to be arranged. The invention can also be used for systems where the supply is not via a branch 1 of the double office line 1, 2 and earth, but in a known manner via both branches I, 2 one behind the other with the exclusion of earth.

Claims (4)

Patent-to sayings: I. Circuit arrangement for extension traffic with automatic final signaling to the office by attaching the handset to the extension and telephone notification of the office call from the main office to the desired extension, characterized in that the main office (H), which, when querying the office (A) resp. of the calling subscriber in a known manner produces a current flow through the microphone or an equivalent resistor that locks the final character (53) on the office, when switching the main station (H) from the exchange line (20, 21) to the extension line (46, 47) an auxiliary power line , if necessary using the exchange call sign (12) on the main station, which influences the closing signal (53) on the exchange in the same way as the speech set (28) and when the intercom connection is established from the exchange to the extension (e.g. 2V ₁ ) by either one of the speech switching ter (U) or the switching element dependent on the receiver hook (s) of the main unit (e.g. via R) is opened again, for the purpose of preventing premature termination signals after the office. 2. Circuit arrangement according to claim i, in which the speech connection between the office and the extensions is made by a common speech switch with idle, query and talk position, characterized in that the auxiliary circuit (with a relay R) through one of the extension on the Switching device (k) assigned to the main unit (plug with or without cord, button, etc.), which mechanically or electrically switches the speech set (28) of the main unit from the exchange line (1,2) to the extension line (46, 47) and the connection of the latter with the through contacts (48, 49) of the speech switch (U) is effected, closed and opened by turning the speech switch into the through position (50). 3. A circuit arrangement according to claim 2, characterized in that the speech switch (U) is brought from the ■ interrogation position, avoiding the rest position directly into the intercom position (50), for the purpose of avoiding a temporary closing signal at the office. 4. Circuit arrangement according to claim ι to 3, characterized in that the switching of the speech set (28) of the main station (H) from the exchange line (20, 21) to the extension line (46, 47) by means of a relay (R) takes place, which at the same time serves as a closing resistor for the auxiliary circuit for locking the exchange sign (53). 1 sheet of drawings.