DE611853C - Circuit arrangement for telephone systems with line selectors, in which connections with the lines of a multiple connection are established via parallel selectors - Google Patents

Description

GERMAN EMPIRE

ISSUED ON APRIL 8, 1935

REICH PATENT OFFICE

PATENT LETTERING

CLASS 21a ³ GROUP 28 so

Patented in the German Empire on September 4, 1929

Self-access systems are used to connect calling subscribers with multiple lines Line selector is often first set to a collecting line, via which a free selector is then started for selection of a straight free multiple connector. The invention relates to an arrangement at which after. Setting of the line selector to a common line connected in parallel to the line selector Voter is started. In the known arrangements of this type are of the Speech lines occupied lines of the

~ melleitung switching means connected, which are excited by the ringing current transmission of the line selector and the setting of the parallel selector. The starting line remains occupied for a long time, so that the whole multiple approach to the

ao traffic is withdrawn.

In order to reduce the switching processes on the manifold to the least amount of time, According to the invention, the relevant switching devices are connected to the test wire of the bus and designed in such a way that, stimulated by the test, an interruption of the Cause the test circuit and thereby the start-up of the parallel selector and the switchover the test relay of the line selector to the parallel selector.

As a result, the collecting line is only occupied and blocked for a short period of time which is a line selector currently checking for switching to a parallel selector is stimulated. Immediately after the incentive has been issued, additional line selectors can be placed on the collective line.

For a better understanding of the invention and to explain further features according to the invention, reference is made to the drawing, which shows an embodiment of the invention. The drawing shows this only essential, for establishing a connection between the subscriber T ₁ and the subscriber T ₂ of the multiple port necessary switching means is. Depends the subscriber T _1, so it is in · a known not closer manner to be described via the call detector AS connected to a line selector LW . The occupancy relay 5 is switched on when the caller is started by the contact? / ₂ to the test wire. The excitation current for relay V flows from + (in the call distributor, not shown), LJF head contact kl, Re-

*) The patent seeker stated as the inventor:

August Heibel in Frankfurt a. M-Ginnheim.

lais V, -. As soon as relay 6 "can respond, it short-circuits its lower high-resistance winding with S ₁ and thereby blocks the assigned connection set AS-LW. Contacts S ₂ and S ₆ switch the speech wires through, so that relay / is excited via the subscriber loop. Contact i ₄ closes the excitation circuit for relay N: -j- (from call distributor AV) V ₆ , i _it relay N, -. Relay N closes a holding circuit for itself and for relay V with contact n _t if the stimulus potential is activated after the connection set has been assigned is removed from the call distributor AV Contact W ₆ prepares the setting of the line selector LW .

A rod selector with step-by-step operation is assumed as the line selector Decade selection makes the corresponding multiple brush effective for making contact, ao so that with the Einerwafal only one connection can be established in a given decade, the contact field of these voters is of the well-known panel type in which the multiple connection of the contacts is formed by sheet metal strips ·. Also the c-core of the collecting lines to be set in the line selector is switched multiple times.

To select the decade, the subscriber T ₁ operates a dial and thereby lets the line relay drop out correspondingly often in a known manner. Contact t _a lifts the brush holder in the circuit: +, Η-, ⁿ e <1%, p2> solenoid H, - by the same number of steps.

During the adjustment, the delayed relays V and N remain energized. Relay V is namely kept energized after opening the head contact kl in the circuit +, K ₄ , V ₆ hl, relay V, -. The contact hl is closed by the armature of the lifting magnet each time it is attracted. Relay V drops out with a delay after the decade has been selected.

When the connection set was assigned, the double armature relay M was fully excited before the excitation of N via 4- (in the call distributor AV) n _it v _t , relay M, -; the contacts controlled by the armature of this relay, which responds easily or with difficulty, are marked in the circuit diagram with ml or ms . This relay M is held during the decade selection via +, M ₄ , ms ₂ , relay M, -,

By opening the contact W ₄ when the relay V drops, the heavy armature of the relay M drops. Via -j-, W ₄ , v ₆ , ml _is resistance Wi ₂ , relay M, - the light anchor remains held. This also keeps the relay N energized with contact WiI ₃ in the circuit +, W ₄ , WiI ₃ i ₄ , relay N, -. In the fall time of the heavy armature of the relay M there is a circuit + » ⁿ i> ^V 6> ms ₆ , magnet El, - in which magnet El is excited, which makes the particular set of brushes effective.

In the case of single dialing, - (-, W ₄ , ml _s , hl, relay V, - relay V on again, opens with contact ^ ₀ , which is parallel to contact ml ₃ , the excitation for relay M, which is now falls completely and prepares the test circuit with its contact ml _4.

After setting the solenoid H , relay V drops out again and closes the test circuit, which is connected to -J-, w ₄ , w ₆ , ml _iy os _s , relay P, S ₅ , 3> ₄ , Oj ₁ , c- arm of the LW leads to the occupancy relay of the selected line. The drop in v _a results in the delayed dropping out of relay N , so that the test circuit only exists in the time until the drop of%.

If relay P cannot respond due to the selected connection being occupied _{, W 6} switches the lifting magnet into the circuit: +, breaker RU, wl, αΙ _Ά , M ₆ , q ₂ , pi, magnet H, -, in which the contact ze / Z remains closed only for the duration of the selector's stroke. In the highest position of the selector there is a mechanical influence on the set of brushes made effective for making contact, which moves it into the ineffective position, the contact wl is opened and the selector falls into the rest position. In a manner not shown in detail, the caller T ₁ then receives the busy signal.

If the line selector LW was set to a free individual connection, relay P could respond via the subscriber relay. It blocks with P ₁ by short-circuiting the high-resistance winding, with pi prevents the selector from running home after relay N has dropped out, and with p ₂ and p ₆ switches ringing current to the selected line. The ringing current flows through the relay Y, but without being able to excite it, since its left winding is _{short-circuited by contact g 4} and has a delaying effect. Only when the subscriber T ₂ hangs up due to the call does a direct current flow through relay Y , which can excite it.

Contact 3> ₄ opens the short circuit for relay Q. Contacts ^ and y ₆ switch through the speech wires. Relay Q short-circuits with contact q ₅ relay P and switches itself into the test wire as a blocking relay. Relay P also switches off the ringing current when it drops. Before that, however, the battery was connected to relay Y by q _x and g ₄ , and the task of ^ ₄ was taken over by q _s.

The premature termination of the established connection, for example when calling the selected one

The connection is initiated by the relay / dropping out, which ■ causes the delayed dropout of relay 6 * by short-circuiting relay 5 by means of i _2. Contact S ₅ opens the test circuit, so that the falling contact p ₄ closes the home circuit.

After the end of the call, the triggering of the line selector depends on the called party, who by hanging up causes ίο relay Q to drop, which in turn causes the home run through q _2.

If the calling party T ₁ wishes to speak to a subscriber of a multiple connection, he sets the line selector, as already described, to the group number associated with the multiple connection. The speech wires are not connected to the bus. Relay I, which is connected to relay II like a relay interrupter, is on the c-wire, so that shortly after. the testing and response of the relay I by interrupting the test circuit by means of contact H ₁ relay P is de-energized again. Meanwhile was +> n _3, p _s, resistance Wi _1, relays A, - the delayed been energized operating double-armature relay A in the first stage; the contacts actuated by the light or difficult-to-respond armature of this relay are denoted by al and as. The fall of relay P, which then occurs before the fall of relay N , causes the rotary magnet of the parallel selector MW: - \ -, M ₃ , p _B , al ₂ , rotary magnet DMW, - to be excited for the first time. The selector MW takes a step and turns its shaft contacts Wm ₁ to wm ₃ .

In the meantime, relay N has dropped out and puts the rotary magnet DMW in the stepping circuit + j interrupter RU, wm _a , q _s , M ₃ , p _s , wm ₂ , rotary magnet DMW, -. Via -j-, Wm ₁ , relay A, - relay A is fully energized after the first step of the rotary selector MW , switches Kontaktas ₅ to -f- ^and uses contact as _x to switch test relay P to the test wire of the Parallel selector MW.

If the voter MW checks for the first free connection T ₃ , relay P responds in the usual way: +, as ₅ , relay P, S ₅ , y _A , as _u arm c of the MW, subscriber relay, -, blocks with P. ₁ and with p ₅ opens the circuit for the rotary solenoid DMW.

As described above, subscriber T ₃ is now called, can switch off the call when picked up and speak to _{the calling party T 1.}

The triggering takes place here as well as a function of the subscriber T ₃ , who causes the set line selector and the parallel selector to run home by de-energizing relay Q using q ₂ and q _s.

Without deviating from the inventive concept, other devices can also be used assign to the bus lines, with the help of which the line selector influences can be. So the parallel selector could, for example, be influenced by alternating current incentivize line selectors from the busy hunt group. In In any case, however, a longer occupancy must be avoided in order to be able to use multiple switching not to cause false blocking.

Claims (3)

Patent claims: i. Circuit arrangement for long-distance intercoms with line selectors, where connections with the lines' of a multiple connection after setting of the line selector to a collective line assigned to the multiple connection via a line selector parallel selectors are produced, characterized in that the Test wheels of the busbars are assigned switching means, which, in the Test stimulated, cause an interruption of the test circuit and thereby the starting of the parallel selector and the switching of the test relay to initiate the parallel dialer. 2. Circuit arrangement according to claim i, characterized in that the line selector is assigned a relay (A) which can only be excited if the test is successful within the period of time provided for the test, which relay (A) when responding • The parallel voter circuit is prepared. 3. Circuit arrangement according to claim ι and 2, characterized in that the switching circuit of the parallel selector is closed by the contact (^ ₅ ) closed when the test relay (P) drops. 1 sheet of drawings