DE151623C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

The present invention relates to a circuit arrangement for telephone -intermediate- and terminals with a common office battery, which is used for the call and to power the microphones, both in the intercourse of the participants with the office as well as in the intercourse of the participants among themselves. The call to the office from the intermediary is made by picking up the phone of the receiver; In this call, one branch of the loop with the free pole is the office battery and is connected to earth connected to a switch arranged on the intermediate point, while the other Branch of the loop grounded via the call sign and also connected to the mentioned switch on the intermediate point will. The facilities of this type that have become known so far (see e.g.

D. R. P. 134270) show the inconvenience that the traffic between the secondary and main post a new ground must be present, while in the present invention one existing grounding is used for this purpose. In addition, when you call those institutions, the Intermediate point after the extension or vice versa, the call flow through the. Microphones of the two participants, which is avoided in the present invention.

Finally, in contrast to the known device, the new construction never call the office directly and be called by the end station, so that the intermediate station controls the end station and is always informed about what is going on there.

The present invention is shown schematically in the accompanying drawing for illustration came. It shows Fig. I the new circuit and

Fig. 2 shows a modification of the same.

At the office, the equipment peculiar to Kellogg's central battery systems is required. The double line 155 and 156, to which the main and secondary units are connected, ends at the office in a signaling device which is normally connected to the line through the two armatures of the isolating relay 10 and consists of a signal relay 14 on one side and a resistance coil W consists on the other side of the central battery B ^1; the signal lamp 5 is in a local circuit that is closed by the signal relay 14 when the subscriber calls by lifting the receiver.

The line 155, 156 leads from the office first to the main office X, where a bell 157 and a condenser 158

constantly lying in a bridge to her; this bridge does not allow direct current through. A lever switch or button K? is provided and has two pairs of springs 159, 160 and 161, 162. This button can have the usual shape, but the two pairs of springs should be able to be moved independently of one another. The spring 159 is normally connected to the conductor 163, which is connected to the line branch 155, but can be brought into contact with the conductor 164, which forms one branch of the double line 164, 166 leading to the extension Y. Similarly, the spring 160 is normally connected to the conductor 165 leading to the branch 156; however, it can be connected to conductor 166, which forms the other branch of the double line leading to extension Y. From the contact normally resting on spring 160, a conductor 167 leads to a normally closed contact of spring 161; An impedance roller 168 is enclosed in this conductor 167.

The normally open contacts of springs 161 and 162 are with branches 155 and 156 connected to the main line.

The telephone hook of the main unit X opens normally (with the handset attached) the bridge wire 169 connecting the springs 159 and 160 and containing the microphone and the handset , while the push button 172 is permanently connected by conductor 173 to branch 166 leading to extension Y. The connection with conductor 171 can be released by means of the push button and the connection can be established with conductor 174 to the main line branch 156.

On extension Y , branch 164 leads to the telephone and microphone and branch 166 to the hook, which normally (with the handset attached) opens the connection between the two branches 164 and 166, while the branch through conductor 175 to push button 176 through conductor 177 and through the once striking bell 178 keeps closed to the earth. A connection to branch 164 can again be established by means of conductor 179 by means of push button 176. The main unit X calls the exchange by simply taking the telephone off the hook, creating a circuit from the central battery B ¹ on the exchange via branch 156, conductor 165, spring 160 of button K ⁵ , hook, microphone, telephone, Head 169, spring 159, conductor 163, branch 155, line relay 14 to the other pole of the battery B ^{1 is} closed. This energizes relay 14 and illuminates lamp S. In response to this signal, the officer puts the interrogation plug into the handle /, switches on and asks for the desired number. By plugging the jack J , a microphone feed current is simultaneously sent from the office battery B ^1, which is connected to the plug cord, to the main or possibly also the auxiliary unit. Conversely, subscriber X can also be called in the usual way by an alternating current generator installed at the office, the current of which acts on the bell 157. However, the exchange cannot call the subscriber on extension Y directly in this way.

Subscriber X can call subscriber Y by pressing button 172, which connects a circuit from battery B ¹ to the office via branch 156, conductor 174, button 172, conductor 173, 166, 175 and 177, through the bell that strikes once 178 closes to earth. Of course, as many strikes as you want can be given with the bell, by appropriate manipulation of the pushbutton 172. The subscriber Y can call the subscriber X by pressing the button 176, creating a circuit from the central battery B ¹ via branch line 156, conductor 165, impedance roller 168, conductor 167, spring 161, conductors 164, 179 and 175 back to master station X via conductors 166 and 173, the normal position push button 172, conductor 171 is closed by the bell 170 to earth; Here, too, any number of bell stops can be given.

If the subscriber Y wants to deal with the office, X moves the button K ^{5 in} such a way that the springs 161 and 162 are pressed outwards, whereby the branches of the secondary line 164 and 166 are connected to the main line 155 and 156; then Y takes the handset off the hook and calls the office.

If the participants X and Y want to talk to each other, X puts the button K ^ so that the springs 159 and 160, to which the microphone and telephone of the participant X are connected, are applied to the branches 164 and 166 of the secondary line; The speech current is conducted from the central battery B ¹ via conductors 156 and 165, impedance roller 168, through both microphones in parallel connection back via conductor 173 and bell 170 to earth, without requiring any other earthing, as previously necessary. Since the bell 170 is a knock-in bell, it is only used once when the springs 159, 160 are applied

of the button K? hit the lines 164, 166, but this does not cause any disturbance of any kind.

In Fig. 2 generally the same facility is drawn with the exception that the subscriber Y cannot communicate with the office. The button K ⁷ in this case only has a pair of springs 159 and 160, which enables the two participants to communicate with one another when the springs are placed outwards. In the normal state, X communicates with the office. Here, too, the central battery B ¹ supplies power for speaking and signaling.

Claims (1)

Patent claim: Circuit arrangement for telephone intermediate and terminal stations with a common exchange battery and automatic call, in which one line (156) of the loop in the switching office is connected to the free pole of the exchange battery (B ¹ ), which is connected to earth on one side, while the second line (155 ) is grounded via the call sign (14), characterized in that the lines (164, 166) of the terminal (Y) in the rest position from the associated lines (155, 156) leading to the office are separated in such a way that the one line (166) via a call button (172) located on the intermediate point (X) and an alarm clock (170) is connected to earth, while the other line (164) via a self-induction coil (168) and a switch (K ⁵ or K ¹ ) is connected to the line (156) leading to the office battery (B ¹ ). 1 sheet of drawings.