DE141728C - - Google Patents

Description

IMPERIAL

PATENT OFFICE

The new circuit for telephone exchanges with automatic termination and automatic Deactivating the query apparatus enables the officer in the to to be called subscriber leading line sent wake-up stream on the office a signal appears, which disappears again as soon as the called subscriber picks up his remote receiver from the switch.

This firstly absorbs the otherwise required in telephone exchanges. Battery drop door superfluous, which indicated the occurrence of the Rufrtroms in the subscriber line, second an automatic message from the second participant is reached.

The circuit is shown schematically in the drawing. A and B mean subscriber stations in whose alarm circuit a direct current lock ρ ρ ¹ (capacitor, polarization cell or the like.) Or a high resistance is switched on. The speech circuit of the same, however, does not contain any interlocking.

The subscriber stations AB are respectively through the lines La ₁ La ₂ . Lb ₁ Lb ₂ with the connecting pawls ^ ₁ _ ₃ resp. ^ ₁ _ _{3 of} the Office in conjunction. The call on the part of the participants can be made in any way, e.g. B. by turning the crank of a magnetic inductor at the participant.

In addition, the establishment of the connection, etc. jacks as well as call sign and busy control are not considered for the present arrangement and can be carried out in any way. In the drawing, an on-order known design is shown, which _{switches off the subscriber call sign W 1} m ₂ and the simultaneous application of the control battery BC to the latch body by closing the spring contact 0 when inserting a plug into one of the pawls and thus causing the relay to be excited H ₁ n. ₂ allowed to bring about.

S ₁ is the interrogation plug, S _{2 is} the connecting plug,

K ₁ is a during the query in the

Plug line switched on capacitor (or polarization cell), but which during the Subscriber call is short-circuited by closing relay contacts 5 and 7.

R ₁ is the interrogation relay, R ₂ the end signal relay belonging to the connecting plug. The latter is also used to monitor the wake-up current (instead of the battery flap mentioned) and to report that the called subscriber has appeared on the phone.

JR ₃ is the switch-off relay, which is used to switch off the official interrogation device. The same occurs only as a result of the wake-up current flowing through its winding χ when the alarm buttons T ₁ T _{2 are} pressed and then holds its armature by means of the holding winding, whereby the official remote receiver is switched off in a known manner. The currents flowing through the wake-up circuit and the holding winding are specified later. Only when the subscriber connection is disconnected

Inserting the connecting plug S ₂ in the rest position, the circuit of the holding winding closed via contact 9 is interrupted.

Simultaneously with the attraction of the armature to the relay R ₃ , the preparatory contact 16 for the final and control signal relay R _{2 is} closed and only opened after this armature has dropped. The final signal relay R ₁ responds - since it is directly connected to the battery 5 B - immediately when the plug S _{1 is} inserted into the interrogation latch, opens the signal lamp contact 6 and closes the first contact 5. The final signal and control relay JR _2, on the other hand, as well as the signal lamp supply line 45 can only receive power by closing the preparatory contact 16, and this device is made with respect to the relay R ₂ in order to avoid premature, disruptive response of the same, which when inserting the plug S ₁ into the connecting pawl easily by the resulting short circuit could occur between the plug neck and plug tip as a result of simultaneous contact with the metal of the latch body.

PW represents the generator that generates the wake-up current.

Z is a choke coil. These and the windings of the relays R ₁ and R ₂ , which also act as a throttling on alternating current, prevent the speech currents from entering and thus weakening the electrical circuit of the signaling system.

If subscriber A calls and the flap Tn ₁ falls, the officer inserts the interrogation plug S ₁ into the interrogation latch, e.g. B. in C ₃ . As a result of this plugging, the call sign JIi _{1 is} switched off as a result of the excitation of the relay H ₁ , the relay R _{1 is made} to respond and the official telephonist t is connected in a known manner. A capacitor K ₂ is connected upstream of this in order to achieve a reliable test. The interrogation circuit now goes, starting from the official remote receiver t , via line 53, contact 14, 5, line 28, 27, capacitor K ₁ , line 26, 25, plug tip, short pawl spring, line La ₁ , switching hook u of subscriber station A, contact 1 , Participant remote receiver v, line La ₂ , long spring latch, plug neck, line 22, 36, contact 15, capacitor K ₂ , line 52 to the remote receiver t back.

After the query, the officer pulls the connecting plug S ₂ - whereby the spring contact 9 closes automatically - checks in a known manner and, if the test has shown "free", inserts the plug S ₂ into the connecting pawl located next to him, e.g. B. d _{% of} the subscriber to be called B. Then the officer presses the call button T ₁ T ₂ and wakes up.

The ringing current flows, coming from the generator PW , via line 48, contact 13, line 31, plug tip, line Lb ₁ , switching hook U ₁ of subscriber station B, contact 4, capacitor P ₁ , alarm clock W ₁ , line Lb ₂ , plug neck, line 24, contact 11, line 47, winding χ and line 49 back to the generator.

As a result of the effect of the ringing current in the winding χ, the switch-off relay R _{s picks up} its armature and closes via contact 16

ι. the local circuit of its holding winding, in which the spring contact 9, which was closed earlier when the connecting plug S _{2 was pulled out, is switched on.} The local circuit of the holding winding y , starting from the battery 5 B , is composed of lines 58, 51, spring contact 9, line 50, holding winding y, contact 16, ■ lines 56 and 57 back to the battery;

2. the circuit for the signal and control lamp k, namely the same receives power from the battery SB via line 57, 56, contact 16, line 45, 46, contact 8, line 42 and back via lines 43 and 58 to the battery .

Further, the contact 16 is placed, the coil of the relay R ₂ to the one pole of the battery SB by the closure so that this relay v ^l from Umschalthaken U ₁ of the station B receives power for removal of the remote receiver, go and that of battery 5 B from Via line 57, 56, contact 16, armature of relay R ₃ , line 38, relay R ₂ , line 33, 30, contact 12, line 31, plug tip, line Lb ₁ , switch hook U ₁ , contact 3, remote receiver V ₁ , Line Lb ₂ , plug neck, line 24, contact 10, line 23, 22, 34, choke coil ^, line 35, 58 back to the battery.

As soon as the called subscriber B picks up his remote receiver V ₁ , the sound hook U ₁ closes the contact 3, the relay R ₂ - responds and it goes out as a result of the opening of the contact 8, the signal k. At the same time, as a result of the closure of the contact 7, a short circuit of the capacitor (polarization cell etc.) K _{1 occurs} via lines 26, 29, contact 7, line 40, 39, contact 5, lines 28 and 27 back to the capacitor. Since, as a result of this capacitor short circuit, the plug tip line 25 is connected directly to the plug tip line 30, 31, the winding end 32 of the relay R ₁ that is permanently connected to the line 25 also comes into direct connection with the winding end 33 of the relay R _{2 that is permanently connected to the line 30} . The relays R ₁ and R ₂ are thus simply connected in parallel.

The speech circuit is then as follows:

From the remote receiver ν (or induction coil) of station A, the speech currents flow through contact 1 and switch hook «line La ₁ , tip of plug S ₁ , line 25, 29, contact 7, line 40, 39, contact 5, line 28, 30,

Claims (2)

Contact 12, line 31, tip of the plug ^ 2, line Lb1, switch hook U1 of subscriber B, contact 3 and remote receiver V1 of the same, line Lb2, neck of the plug J2, line 24, contact 10, line 23, 22, 21, neck of the plug S1 and line La2 back to the remote receiver of subscriber A. The final signal consists of a simultaneous glowing of both final signal lamps / ίο and k. The same thing takes place, as is known, completely automatically when the subscriber telephones are reattached ν vl respectively as a result of turning over the switch hooks u. U1 in the rest position, switching off the remote hearing resistance and switching on the DC lock ρ ρ1 again, whereby the currents flowing through the relays R1 and R2 are interrupted, so that the armatures of the same return to their rest position and the contacts 6, 8 close. The end signal relays R1 R2 cannot come into effect individually and separately from each other to output the end signal, and since they are connected in parallel to both plug tips, they cannot be influenced by a single subscriber station, but rather the cooperation of both subscriber stations is required for the automatic output of the end signal. Only at the moment when the switch hook of the second station is also put into rest position by the remote receiver, both relays R1 and R2 are de-energized and release their armature, whereby contacts 6 and 8 are closed and both lamps / and k glow at the same time to be brought. The current that causes the lamps to glow flows from battery SB via line 57, 56, contact 16, line 45, from where it branches once via line 46, contact 8 and line 42 to lamp k and the other time via line 44, contact 6 and line 41 to the lamp / to flow back via lines 43 and 58 to the battery SB. If the officer sees when both lamps / and k light up that the conversation has ended, he releases the connection and puts the plugs S1 and S2 in the rest position. Here, the plug S2 opens the contact 9 again and thereby interrupts the holding winding y of the switch-off relay R3, the same is de-energized and its armature drops. The falling armature opens contact 16, whereby both lamps / and k go out, and by closing contacts 14 and 15 switches on the official remote receiver t again. The system is then returned to its rest position. Instead of the incandescent lamps / and k mentioned, any other signaling apparatus (galvanoscopes, self-righting drop flaps, etc.) can of course be used, and the armatures of the relays R1 R2 can also be directly provided with indicators. The ringing current winding χ of the switch-off relay R3 can be excited by local current of any battery instead of the wake-up current by means of a working contact which is to be moved when the call button T1 T2 is pressed. The holding winding y can also be branched off from the ringing current winding χ or one and the same winding can be used for both purposes. Instead of the full ringing current, part of it can also be used to excite the shut-off relay i? 3. Instead of the connection plug 5, the contact 9 can also be activated by the interrogation plug. Godfather nt-A ν Proverbs: 1. Circuit for telephone exchanges with automatic final signal delivery and automatic shutdown of the interrogation apparatus, characterized in that a contact (16) is closed through the armature of the switch-off relay (R ₃ ) excited by the wake-up current of the office, via which the battery (SB) is connected to the Final signal lamps (k I) and the relay (R ₂ ) for the second subscriber is placed so that the lamp k glows until the called subscriber picks up his receiver. 2. A circuit according to claim 1, characterized in that the excitation of the switch-off relay (R ₃ ) is carried out by the appropriately a special winding (x) flowing through the alarm clock current, whereby the battery (SB) to the final signal lamps and relay _{(R 2} ) subsequent contact (16) is closed and is held in this position in a known manner by a holding winding (y) until the connecting plug (s ₂ ) is returned to the rest position. For this purpose ι sheet of drawings.