DE159826C - - Google Patents

Description

IMPERIAL /

PATENT OFFICE.

JVl 159826 CLASS 21 a.

get connected.

The present invention relates to a circuit arrangement for telephone exchanges, especially for those in which night operation has not been introduced and yet a limited number of night connections established or a number of subscriber lines shared on a line, e.g. B. to the fire station should be switched.

ίο Present invention used for manufacture the connection special pairs of plugs, and that is with this arrangement by simply removing the receiver the subscriber station - as it normally happens to call the exchange - an alternating current sent to the voice line, who then picked up the second receiver is switched off again by the line. The idea of the invention lies particularly in the

Arrangement of two monitoring relays in the subscriber line, one of which each of each participant location is regulated. The circuit is such that by tightening of the one monitoring relay, a ringing current is switched into the line either directly or by means of a relay and then switched off again by pulling in the second monitoring relay. The invention is illustrated in more detail in the drawing.

Fig. Ι is an arrangement for ordinary night connections. Fig. 2 is an arrangement suitable for fire stations. Figures 3, 4, 5 and 6 are different embodiments of the same inventive concept.

Two ordinary subscriber stations A and B (Fig. 1) consist in the usual way of the series-connected capacitor C and alarm clock D, while the subscriber lines are closed with the handset off the hook via the microphone E and the induction coil F for direct current. Subscriber station A is connected via the subscriber line 2, 3 and via the internal contacts of the disconnecting jack G, which is usually arranged in the upstream table, with the multiple jacks H and then in the usual way with the calling devices. The plug line consists of the two plugs K and L, which are connected to one another and in a bridge keep the inductors AiundiV switched on with a relatively high self-induction. Between the coils Mouth N is the central battery, which may consist of drying elements during very weak night-time operation. can, which are used to feed the subscriber microphones. The monitoring relays O and P, which are provided with the non-inductive shunts Q. and R , are connected in series. These are dimensioned in such a way that direct currents cause the relays O and P to respond, while alternating currents do not affect the relays for both calling and speech purposes.

but take their way over the bifilar wound shunts Q. and R. The working contacts of the monitoring relays 0 and P are each connected to one winding of the switch relay S. These windings have the same resistance as the relay OP, but are arranged in opposite directions, so that in the event of a current short in both windings of the relay 5, the armature does not

ίο be tightened resp. fall off if they were dressed. By tightening the armature of the switching relay 5, the ringing current source T is applied to the lines 4, 5 of the double line.

If a ringing current machine is not provided for the night, the Alternating current of a pole changer can be used. The primary circuit of the pole changer is then closed by means of a third contact of the switch relay S, so that the pole changer is only driven when power is required.

The mode of operation of the arrangement is as follows:

The participants of the subscriber stations A and B, who want to stay connected during the night, are connected to one another on the upstream table in the separating pawls G and U by means of the special pair of plugs KL. If subscriber A wishes to speak to subscriber B during the night, subscriber A removes his receiver from the hook, whereby the monitoring relay O becomes live, closes its contact and thereby causes the switch relay S to be excited. As a result, alternating current reaches the plug lines 4 and 5 and thus also into the subscriber line 6 and 7 and causes the alarm clock of subscriber station B to sound. As soon as subscriber A hangs his receiver back on the hook, the alarm clock will of course stop ringing at -B. As soon as B answers the call and in turn takes the receiver off the hook, the relay P is energized, closes its contact and thus the one winding of the switch relay S, which is now re-energized and again applies ringing current to the plug line 4, 5. Now the alarm clock of subscriber station A sounds, giving the subscriber waiting there the signal that B has answered. A now in turn takes the receiver off the hook, whereby the relay 0 is energized and connects the second winding of the switch relay S to earth. Both windings of the switch relay S now carry current, but in the opposite direction, so that the relay drops its armature and the alternating current source from the lines 4, 5 is switched off again. If the participants have now ended their conversation, the monitoring relays 0 and P are de-energized by hanging up the receiver. In this circuit, the subscriber B can subscriber A or vice versa, as already described, subscriber A call to the subscriber B.

Fig. 2 shows an arrangement to be used for fire alarm purposes. The circuit differs from the one shown in FIG. that the ringing current flows to the other subscribers plugged into the common line and possibly gives a signal there. At A ² , a subscriber station is illustrated which is connected to the jacks G ² H ' ² . The separating latch on the upstream table is connected to the latch U ^{2 of} the fire alarm line by means of the plug cords K ² L ^2. There are also further pawls U ⁱ , etc. arranged, all of which are in multiple connection and on which any other subscriber lines can be placed on the line 8, 9 to the fire station by means of further pairs of plugs K ' ² L ^2. The double line 8, 9 via the monitoring relay O ² and the rest contacts of the switching relay S ² For night becomes stopper ZA this plug L ³ on the office in the separation pawl U ³ the subscriber's line B ^2, so in this case, the fire station, plugged. In the bridge to the plug line 8, 9 are the choke coils M ² N ² of high self-induction and also the monitoring relay P ² in series. The three sets of contacts of the switch relay S ' ² are arranged so that when the armature I. is attracted ^{by the current N 3} , upper winding S ² , working contact of O ² , earth and Ν ^Ά , the alternating current source T ^{2 is connected} to the plug line , 2. the line 10 is separated from the line 8 and placed over a special choke coil M ³ of high self-induction, 3. the line 11 is separated from the line 9 and connected to earth. This arrangement ensures that when the relay S ^{2 is} energized, alternating current flows to the subscriber station B ² , and that then, when the handset from B ^{2 is unhooked,} the battery N ³ via the resistor M ³ , relay P ² , line 10, etc. to subscriber station B ² and back via line 11 and earth finds a current path that energizes relay P ² and closes the second (lower) winding of switch ^{relay S 2} to earth. The two windings of the switch relay S ² are again arranged opposite one another, so that now the

Claims (3)

Switch relay drops its armature again and the conversation between A2 and S2 can take place. By disconnecting lines io and ii from lines 8 and 9, ringing current is prevented from flowing from ringing current source T'2 back via line 8, 9 and via other subscriber stations that are also connected to the common row of jacks U2 U * . In Fig. 3 a further arrangement is shown, 'from which it can be seen that the present invention bezw without the use of the switch relay S mentioned. S2 can be recycled. The monitoring relays O4 Pi, which only respond to direct current, are provided with a normally open and a normally closed contact, which are connected in the manner illustrated. If one O4 of the two relays is energized, it closes its normally open contact and now allows the ringing current from the ringing current source T ^ via the normally closed contact of relay P4 and the normally open contact of relay O4, line 13 to the subscriber station and back via the choke coil M4 to earth to flow. When the call is answered by the second subscriber, the second monitoring relay P4 is now energized, as a result of which the ringing current is again separated from the ringing current source 7 "4 and the conversation can take place between the subscribers. To show that the apparatus Af4 N * in FIG 4 shows a second circuit in which the subscriber lines are connected to each other via a transmitter coil at Af5 and .2V5. In this case, it is important to provide the transmitter coil with a closed magnetic circuit in order to safely achieve the ringing to both subscriber stations by means of alternating current. Instead of the transmitter coil N'0, the monitoring relays 0 ° can also be used P0 step, as shown in FIG. 5, which is then replaced by a K ondensator JV0 must be bridged. The operation is as already described here. 6 shows a further embodiment of the invention, in which the two monitoring relays O7 P7 are again arranged, which are controlled independently of one another by the connected subscriber stations. The switching of the contacts here is such that the ringing current source T1 is applied to the second line 17 by tightening the armature of one relay P7, so that the ringing current flows only to the second subscriber station and not back to the first subscriber station. After the second participant has answered and the relay O7 is energized, the capacitor R7 bridges the choke coils between the lines 17 and 18, and the conversation can take place. Pa ten τ-An Proverbs: 1. Circuit for night connections for telephone exchanges according to the central battery system, in which two subscriber stations are constantly connected to each other, characterized in that two Uberwachungsrelais (OP) are arranged in the 'office so that by removing the one subscriber handset (at A or B) only that a monitoring relay (O or P) is energized and the ringing current is switched to the plug line (4, 5), while the second relay (P or O) is only excited when the second subscriber handset is picked up and this switches off the ringing current, for the purpose of mutual Call without being passed on to the office. 2. A circuit for night connections according to claim 1, characterized in that the monitoring relays (OP respectively O ' ² P ² ) energized by two different call stations regulate a switching relay (S or S ² ) provided in a known manner with opposite windings, which latter Call current to the plug line (4,5 and 10, 11) switches on and off. 3. A circuit for night Compounds according to claim 1, characterized in that by the provided in known manner with opposite windings switching relay (S ^2), the windings of two of two under the influence of microphone units (A ² B) stationary monitoring relay (O ² P ² ) are regulated, ringing current through the plug line (10, 11) is sent to the subscriber station to be called (B ² ) and at the same time the subscriber line from the calling subscriber (A ² ) respectively. is disconnected from several participants connected to a common line (8, 9). 1 sheet of drawings.