DE308166C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

- JVe 308166 - CLASS 21 »1 GROUP

WESTERN ELECTRIC CO. in NEW YORK.

in the supervisory office.

Patented in the German Empire on December 1, 1916.

The more the officers of a telephone exchange are burdened, the clearer they have to be the signals express the wishes of the participants. Very often it happens that a Subscriber wants a new connection immediately after the end of a call and for this purpose usually makes a lamp in the office flicker. Because this flicker depends on the speed of the handset hook movement, it is particularly if the monitoring relays release their armature with a little delay, very unsafe, whether the flickering is evident enough.

¹ S The invention aims the. Creation of an absolutely safe and clear flickering and consists in the fact that an automatic flicker device is set in motion by pressing down and releasing the receiver hook in quick succession in the office.

Two exemplary embodiments of the invention are illustrated in the drawing. Fig. 1 shows a device in which the calling subscriber hur the automatic flicker signal can excite, while in the embodiment of FIG. 2, both participants can turn on the flicker.

In the telephone system according to FIG. 1, which is known per se, does the officer insert the interrogation plug v? into the latch K, on the one hand a circuit is closed by the monitoring lamp 3 (earth, battery, lamp 3, resistor 4, socket 5, relay 6, earth): and on the other hand, the monitoring relay 7 via the two branches of the subscriber line in a known manner Way aroused. The energization of the relay 7 creates the following circuit: earth, battery, breaker 8, normally closed contact 9, normally open contact 10, normally closed contact 11, resistors 12, 4, socket S, relay 6, earth. By the action of the interrupter 8, the monitoring lamp 3 is intermittent. short-circuited so that it flickers. This flickering at the beginning of the establishment of a connection is meaningless in itself and only a consequence of the fact that this is the state which the subscriber can easily restore by simply depressing and releasing his handset hook before disconnecting the connection. As a result, the circuit is also particularly simple. The flickering continues until the officer presses the query button 13 to query. This energizes relay 14 in the circuit earth, normally open contact 15, right winding of relay 14, battery, earth. The relay 14 attracts its armature and closes the make contacts 16, 17 and opens the break contact 11. This is the

Lamp 3 is deprived of power until the call is terminated, since it is constantly in a Shunt (14, 17, 10, i6, battery, earth) is laid. At the same time, the relay 14 holds

'5 excited in the following circuit independently of the query switch 13: earth, battery, working contacts 16, 10, 17, left winding of relay 14, resistor 4, socket 5, relay 6, Earth.

If, after establishing the voice connection between the calling subscriber A and the called subscriber B, the subscriber A wishes to attract the attention of the officer, he only needs to depress the hook and let go of it again. When the receiver hook is depressed, the monitoring relay 7 is de-energized in a known manner and the normally open contact 10 is opened as a result. As a result, the holding current for the relay 14 is interrupted, so that this can drop its' armature. Since the low-resistance winding of the relay 14 is switched off, the lamp 3 receives sufficient current via resistor 4 and relay 6 and lights up. If the receiver hook of subscriber A remains in the lowered position, the lamp 3 continues to burn as a tail lamp until the officer pulls the plug 6 ″ from the latch K. If the subscriber A lets go of his receiver hook before the connection is disconnected , the state described at the beginning, in which the relay 7 is energized and 14 is de-energized, occurs again and the lamp 3 continues to flicker automatically under the effect of the interrupter 8 until the officer switches the interrogation switch 13 to the Inquiry position moved.

In the embodiment according to FIG. 2, in addition to the calling subscriber A , the called subscriber B can also generate the automatic flickering, but only after the calling party A has permanently hung up the receiver. This mode of operation corresponds to the usually existing demand that the caller should generally control the connection and therefore that the called party should only receive control of the connection after the caller has released it.

Therefore, in the circuit according to FIG. 2 on the calling side, a relay 35 corresponding to the relay 14 according to FIG. 1 depends only on the calling party A , while a further relay 34 depends on both participants.

hangs. ,

The circuit according to FIG. 2 operates as follows. When interrogating the calling subscriber A , the relays 34, 35 are energized on the way: earth, contact 15 of the interrogation switch 13, right winding of the relay 35, relay 34, battery, earth. The relay 34 responds. The relays 34 and 35 are then placed in the holding circuit: earth, battery, relay 34, working contacts 36, 37, 38, left winding of relay 35, resistor 39, socket 5, relay 6, earth. If the called subscriber B answers later, his excitement closes via the two branches of the subscriber line. Monitoring relay 40 has its contact 41 and there is a second holding current for relay 34: earth, battery, relay 34, working contacts 42, 41, resistors 43, 44, socket 46, relay 18, earth. If the calling subscriber hangs up the handset, the relay 30, excited via the two branches of the subscriber line, is de-energized, opens at 37 the holding current of the relay 35, which now, in the manner described earlier, the lamp 32 as a result of the current earth, battery, 32, 39, S, 6, lets earth shine continuously. If the calling subscriber A picks up the receiver before the officer disconnects, the relay 30 responds again. If the relay 30 is energized and relay 35 deenergized, the lamp 32 flickers because of the shunt 44, 38, 37, 31, battery, earth connected to it via the interrupter 31. But if the calling subscriber A leaves the receiver on the hook, and if the called subscriber B hangs the receiver, the de-energized relay 40 interrupts the second holding circuit of the relay 34. As long as the relay 40 does not respond again, the earth shines from the current , Battery, 45, 44, '46, 18, lamp 45 through which earth flows quietly as a tail lamp because the shunt running through resistor 43 is open at "contact 41. If the called subscriber B picks up the receiver before the connection is disconnected , the relay 40 responds again. Now the shunt to the lamp 45 is made intermittently by the breaker 31 on the way 43, 41, break contact 33 of the relay 34, breaker 31, battery, earth, so that now the monitoring lamp 45 of the called Subscriber B flickers until the officer activates the relay 34 again by flipping the interrogation switch 13.

A circuit in which both participants can switch on the flickering signal independently of one another is obtained by assigning the same relay 14 as the calling side A to the called side B in the circuit according to FIG. In order to energize this relay and to close its holding current via the socket 46, a ground contact is arranged on the call switch, which acts on the relay 14 in the same way on the new relay as the ground contact on the interrogation switch.

Claims (3)

Patent Claims: ι. Circuit arrangement for telephone systems for switching on a flicker signal in the monitoring office, characterized in that the monitoring relay (7, 30, 40) when there is no power after the end of the call and the subsequent call before the connection is disconnected, another relay (14, 35) see above toggles that an interrupter device (8, 31) located in the office, the monitoring lamp (3, 32) flickers until the officer operates the interrogator (13) again. 2. Circuit arrangement according to claim i, characterized by a further relay (34) whose holding current (earth / battery, 34, 36, 37, 38, 35, 39, 5, 6, earth or earth, battery, 34, 42, 41, 43, 44, 46, 18, earth) depends on the monitoring relays (30, 40) of both participants (A, B) in such a way that it only switches on the flickering from the side of the called participant (B) if the calling subscriber (A) has hung up the handset all the time. 3. Circuit arrangement according to claim i, wherein the monitoring relays are arranged in the cord, characterized in that the flicker symbol (3, 32) is always switched on when the monitoring relay (7, 30) is well energized, a holding current (earth, battery, 16 , 10, 17, 14, 4, 5, 6, earth or earth, battery, 34, 36, 37, 38, 35 »39> S, 6, earth) for the interrogation relay (14, 35) but not yet closed is. 1 sheet of drawings.