DE596309C - Circuit arrangement for telephone systems - Google Patents

Description

GERMAN EMPIRE

ISSUED ON May 3, 1934

REICH PATENT OFFICE

PATENT LETTERING

JVl 596309 CLASS 21a ³ GROUP 75

Siemens & Halske Akt.-Ges. in Berlin-Siemensstadt *) Circuit arrangement for telephone systems

Patented in the German Empire on January 30, 1927

The present invention relates to a circuit arrangement for counting connections in telephone systems and refers in particular to those systems where at Cancellation of the connection takes place the count and one in the feeder bridge of the called Subscriber's lying relay prepares the count. \

The aim of the invention is to enable the counting to be carried out without the use of special auxiliary devices such as auxiliary relays and the like, even if the meter device to be influenced and the feeder bridge of the called subscriber are at different points on the connection path (e.g. at the first group selector and on the LW) are arranged, which is particularly important in telephone systems with dialer operation. This is achieved in that a counting device on a connecting device located in the connection path in front of the feed bridge relay is influenced via switching means in a circuit that keeps a feed bridge relay of the called station energized regardless of its final signaling.

The invention will now be described on the basis of the exemplary embodiment shown in the drawing. It shows the switching devices and lines, insofar as they are necessary for understanding the invention, namely "a group selector GW is shown on the left and a line selector LW on the right."

When a participant lifts the handset, the preselector assigned to this participant, not shown, starts up in a known manner and occupies a free group selector. This creates the following excitation circuit for relay C ₁ in the group selector: from earth, normally closed contact 19 k, winding of relay C ₁ , line c to battery on the preselector. At the same time, relay A ₁ is energized from earth, winding II of relay A ₁ , line b, subscriber loop back via line a, winding I of relay A ₁ to battery and earth. The relay C closes its own holding circuit at its contact 6 C ₁ independent of head contact 19 k and prepares the circuit for the lifting magnet H ₁ at contact 10 C ₁ .

If the calling subscriber now dials the first digit, this circuit is closed every time relay A ₁ drops out: from earth, normally closed contact 13 ^ ₁ and 2 a _v normally open contact 10C ₁ , winding I of relay V ₁ , shaft contact W ₁ , winding of the Lifting magnets ^ H ₁ after battery and earth.

*) The patent seeker stated as the inventor:

Max Langer in Berlin-Hermsdorf.

The solenoid is excited and de-excited in this circuit according to the selected digit and sets the group selector to the selected decade. When this circuit was closed for the first time, the relay V _{1 was} energized, which, as it drops out with a delay, holds during the series of impulses and interrupts the circuit for the rotary magnet at contact 16 V _1. At the first stroke of the group selector, the head contacts 20 k and 21 k were closed.

Each time relay A ₁ drops out, a short circuit for ReIaIsC _{1 is} closed at contact 4 Ci _1. However, since the relay C ₁ drops out with a delay, it remains energized even during the current impulse. If the impulse circuit at contact 2 Ci ₁ remains interrupted after the dial has elapsed, the relay V ₁ drops out and the following circuit is established for the rotary magnet D ₁ : from earth, normally closed contact 13 P ₁₁ normally open contact 3 Ct ₁ , normally closed contact 16 V ₁ , head contact 21 k, winding of the rotary magnet D ₁ , battery to earth. The rotary magnet D ₁ attracts its armature, brings the switching arms to the first contact of the set decade and turns over its contact Cl ₁ . NC contact 13 p _u working contact 3 a _u-closed contacts 16 V _1, 15 ^ _1, contact ^ ₁ of soil: Further, in the first step of rotating, the shaft contact is opened W ₁ so that now a new circuit for both windings of the relay V ₁ comes about on the rotary magnet, windings I and II of the relay V ₁ , winding of the lifting magnet H ₁ to the battery and earth. The solenoid H ₁ does not respond in this circuit because of the high resistance of the two windings of the relay V ₁ . The relay V ₁ interrupts the circuit for the rotary magnet at its contacts 15 V ₁ , 16 V ₁ , which then drops out and opens the circuit for the relay V ₁ at its contact d _x. The relay V ₁ drops out and closes the circuit for the rotary magnet D ₁ again at its contact 16 V _1. This mutual play of the rotary magnet D ₁ with the relay V _{1 is} repeated until the switching arms of the group selector run into a line leading to a free line selector. Then the following circuit is established: from earth, normally open contact 8 C ₁ , windings II and I of relay P ₁ , switching arm of the group selector, normally closed contact 40 k ₂ , winding II of relay C ₂ to battery and earth. In this circuit, ReIaIsP ₁ and C ₂ respond. Relay P ₁ short-circuits its winding II at its contact 11 P ₁ and places winding I in its own holding circuit, independent of contact 8 C ₁ . At the contact 13 p _t , the relay P ₁ interrupts the circuits for the relay V ₁ and the rotary magnet D ₁ , so that the group selector stops on the checked line. Through the contacts 1 ^ p ₁ and 15 P ₁ , the speech lines α and b are switched through to the line selector.

The subscriber now dials the second digit and thereby causes relay A ₁ in the group selector to drop out and respond again alternately. Each time relay A ₁ drops out, the following excitation circuit is created for relay A _{2 of} the line selector: Earth, normally closed contact 5 O ₁ , normally open contact 14 P ₁ , speech line a, switching arm of the group selector, winding of relay A ₂ , battery, earth. When excited, relay A ₂ actuates lifting magnet H _{2 of} the line selector in the following ways: from earth , normally open contact aza ₂ , winding I of relay V ₂ , normally closed contact 46 u, shaft contact 2 W ₂ , winding of lifting magnet H ₂ , battery to earth . The solenoid H ₂ sets the line selector to the selected decade. _{The ReIaIsV 2} responds with the first current surge, and since it drops out with a delay, it remains energized during the series of current surges. During the first stroke of the solenoid, the short circuit for winding I of relay C _{2 is} canceled by head contact 40 k ₂ and this winding is placed in series with winding II of relay C ₂ . Furthermore, the contact 43 k ₂ was turned over in the first stroke step, whereby the excitation circuit for the relay U is prepared.

After the end of the series of impulses, this circuit for relay U is closed by the dropout of relay V ₂ : earth, breaker RU, normally closed contact 38 p ₂ , head contact 43 Tz ₂ , normally open contact 25 C ₂ , winding of relay U, normally closed contact 51 V ₂ , Shaft contact 2 W ₂ , winding of the lifting magnet Ji ₂ ) Battery, earth. The solenoid does not respond in this circuit due to the high resistance of the relay U. The relay U is energized when the circuit is first closed by the relay interrupter and, since it drops out with a delay, it also holds during the interruptions by the relay interrupter. At contact 47 u , the surge circuit is switched from the lifting magnet to the rotary magnet, so that now, when the participant selects the next digit, the rotary magnet is excited and de-excited according to the selected digit, in the following way: from earth, normally open contact 22 a ₂ , Winding I of the relay V ₂ , normally open contact 47 u, winding of the rotary magnet D ₂ , battery, earth. The first time the rotary solenoid is operated, the

Circuit for the relay U characterized / that the relay V ₂ responds again and holds during the current surge series. This new circuit for relay U runs from earth, relay breaker RU, normally closed contact 38 ^ ₂ , head contact 43 k ₂ , normally open contact 25 C ₂ , winding of relay U , normally open contacts 50 V ₂ , 44 u, winding of solenoid H ₂ , battery, earth . The relay U prepares the test circuit for the line selector at its contact 48 u. The rotary magnet switches the switching arms of the line selector to the selected line in the set decade. After the end of the last series of impulses, relays U and V ₂ drop out, and relay U drop out later than relay V ₂ .

If the called subscriber is free, the relay P ₂ responds via the following circuit: earth, normally open contact 48 u, normally closed contact 53 V ₂ , windings II and I of relay P ₂ , switching arm of the line selector to the battery on the preselector of the calling subscriber. Relay P ₂ closes its own holding circuit for its winding I and a short circuit for winding II via earth, make contacts 27 C ₂ , 34 p _2. The voice lines to the called subscriber are switched through to contacts 35 p ₂ and 36 ^ _2. Since relay U has not yet dropped out when relay P ₂ responds, the following circuit is established for relay V ₂ via its winding II: earth, slow breaker LU, normally open contact 5 ο β, winding II of relay V ₂ , normally closed contact 30 y, Normally open contact _{39 p 2} , battery, earth. The relay V ₂ is energized and sends the first call to the called subscriber by applying the alternating current source WQ to the speech lines via its contacts 54 V ₂ and 55 V _2. If the relay U has dropped out, the relay V ₂ is energized every 3 seconds via the 3-second switch SS and the contact 49 "and carries out the further call to the subscriber to be called by sending it every 3 seconds via its contacts 54 V ₂ and sends 55 V ₂ ringing current from the AC power source WQ over the voice lines. If the called subscriber picks up the receiver, relays Y and A _{2 are} excited via the subscriber loop: from earth, winding I of relay Y , normally open contact 36 p ", switching arm of the line selector, voice line b over the subscriber loop back over voice line a, Switching arm of the

device selector, normally open contact 35 p ₂ , normally closed contact 56 V ₂ , winding I of relay A ₂ to battery and earth. This circuit also serves as a feed bridge for the called subscriber. The relay Y interrupts the circuit for the relay V ₀ at its contact 30 y and prepares the counting circuit via its second winding at its contact 31 y. Relay A ₂ interrupts the bridging of the capacitor CO at contact 21 a _2.

If after the end of the conversation the calling subscriber hangs up his receiver, the loop over the voice lines a, b on this side is interrupted, 'and the relay A ₁ drops out. A relay ₁ includes the contact 4 U _1, the relay C ₁ short. The relay C ₁ incident thereon from a delay and includes the contact 9 is C ₁ the circuit for the Zählmagneten: earth, winding of the meter relay Z, closed contact 9 C _1, NO contact 15 P _1, shifting of the group selector, phone line b to line selector ,. Winding II of relay Y, make contacts 313 », 3-9 p ₂ to battery and earth. The relay Z is by closing its contact 2 a counting current surge on the line d to. Counting magnet on the selection dial of the calling subscriber. The relay C shorts the winding I of the relay P ₁ at its contact 5 C ₁ , so that it drops out and interrupts the circuit for the relay C _{2 of} the line selector. The relay P ₁ closes the following excitation circuit at contact 13 P ₁ , the rotary magnet P ₁ : earth, normally closed contacts ¹ Z Pi '7 ^c i> 16 V ₁ , head contact 21 k, winding of the rotary magnet D ₁ , battery, earth. The rotary magnet D attracts its armature, moves the switching arms of the group selector one step further and at the same time closes its contact (I ₁ and thus the following excitation circuit for the relay V ₁ : earth, normally closed contacts 13 p _lt 7 C ₁ , 16 V ₁ , 15 V ₁ , contact d _± on the rotary magnet, windings I and II of the relay V ₁ , winding of the lifting magnet H ₁ , battery, earth. The lifting magnet does not respond in this circuit. Relay V _1, on the other hand, responds and interrupts the circuits at its contacts - For the rotary magnet D ₁ and for itself. The rotary magnet D ₁ drops out and opens its contact d _± . After the relay V ₁ has dropped out, the circuit for the rotary magnet is closed again, and the rotary magnet switches the switching arms of the group selector to one Through this mutual play between the relay V ₁ and the rotary magnet, the switching arms of the group selector are moved forward until the contact arms are unscrewed from the contact bank, where the group selector is triggered. When the group selector has returned to its rest position, the circuit for the rotary magnet is finally interrupted at the head contact 21 k. With this, all switching devices on the group selector are returned to their rest position.

In the meantime, relay C _{2 in the line} selector had dropped out. The relay C ₂ prepares

at its contact 26 C ₂ the circuit find rotary magnets D ₂ and interrupts the short circuit for the winding II of the relay P ₂ and the holding circuit for the winding I at contact 27 c ₂ , so that the relay P is again excited via its two windings : from earth, normally open contact 32 y, normally closed contact 53 V ₂ , windings II and I of relay P, switching arm of the line selector to

ίο Battery on the selection of the called subscriber. If the called subscriber also hangs up, relays A ₂ and F drop. Relay F interrupts the circuit for relay P ₂ at contact 32 y .

Relay P ₂ drops out and closes the circuit for the rotary magnet D ₂ at its contact 38 p ₂ : earth, relay interrupter RU, normally closed contact 38 p ₂ , head contact 43 k ₂ , normally closed contact 26 c ₂ , winding of the rotary magnet D ₂ ,

ao battery, earth. The relay interrupter alternately closes and opens this circuit, so that the rotating magnet alternately is excited and de-excited and the switching arms of the line selector are switched step by step until they are unscrewed from the contact bank. Then the line selector goes back to its rest position and finally interrupts the circuit for the rotary magnet _{through the head contact 43A 2.} The switching devices of the line selector have thus also returned to the rest position.

If the called subscriber first hangs up his receiver, the loop for relays A ₂ and Y is interrupted. The Re-Iaisj4 ₂ drops off quickly, and at contact 2 ia ₂ a holding circuit for relay Y is closed via its two windings: from earth, winding I of relay Y, normally closed contact 21 cio , winding II of relay Y, working contacts 31 y , 39 /> ₂ after battery and earth. If the calling subscriber then also hangs up the receiver, the relay C ₁ in the group selector drops out, and the counting and triggering of the connection devices continues in the manner described above.

Claims (4)

Patent claims: 1. Circuit arrangement for telephone systems, in which the counting of the connection is prepared when reporting the desired subscriber, characterized in that via switching means (39P ₂ , 31 y) in a feed bridge relay (F) of the called station -independent of the final signaling kept excited Circuits a counting device (Z) is influenced on a connecting device (/. GW) located in the connection path in front of the feed bridge relay (F on the LW). 2. Circuit arrangement according to claim i, characterized in that the influencing of the counter (Z) via that switching means (31 y) of the holding circuit for the feed bridge relay (F) takes place, which prepares this circuit when reporting the called point. 3. Circuit arrangement according to claim ι and 2, characterized in that the holding circuit for the feed bridge relay (F) and the circuit for influencing the counter (Z) runs over one of the speech wires. 4. Circuit arrangement according to claim I, characterized in that the Counting device (Z) parallel to that in the feeder bridge of the called subscriber winding of the feed bridge relay (F) is switched. 1 sheet of drawings