DE536282C - Circuit arrangement for dialers with free choice - Google Patents

Description

GERMAN EMPIRE

ISSUED ON
OCTOBER 27, 1931

■ GERMAN PATENT OFFICE

PATENT LETTERING

CLASS 21 a ³ GROUP

Siemens & Halske Akt.-Ges. in Berlin-Siemensstadt *)

Circuit arrangement for voters with free choice

Patented in the German Empire on April 24, 1924

The invention relates to a circuit arrangement for voters with free choice in telephone system ^ and in particular to those voters who can be reached when everyone is busy Lines are placed in a special position.

In the known arrangements of this type, additional switching devices are on the Voters or special wires to

ίο the downstream connection devices necessary. On the other hand, there is an inconvenience with the known arrangements, that the voter remains in the special position when the partially built

ig connection is terminated and other voters in the group have taken the occupied position have so that the voter and, if it is a selection of a subscriber line acts, the subscriber station until all those in the occupied position are released Voter of the group is blocked.

The invention is now based on the object of eliminating these inconveniences and of creating a particularly simple circuit which meets all operating conditions. This task is achieved in that the switching device of the selector in the position obtained when all accessible lines are busy is controlled exclusively by the call relay, in that the circuit ^v of the switching device is interrupted in the special position by a contact of the call relay and when the excitation state of the call relay changes is closed again for the purpose of immediate return of the voter to the rest position.

The main advantage of this arrangement is that the voter is exclusive remains under the influence of the calling station and independent of the status of the accessible lines and the voters the same group can be triggered at any time by the calling station. Will If such a selector is used as a preselector for a subscriber line, then the subscriber is barred only when the subscriber line is actually busy (i.e. calling or called).

In the figure, the circuit of a preselector is shown as an exemplary embodiment.

When the receiver is picked up at the subscriber station T assigned to the preselector VW , the relay R responds via the connection lines La and Lb. About the contact r _x the circuit of the rotary magnet D is closed, which extends from the battery on the switching arm d in position 0, the contacts T ₁ and t _x , winding of D, interrupter U to earth. The rotary magnet is now under the influence of the

*! The patent seeker stated as the inventor:

Alexander Bruno Preush in Berlin-Charlottenburg.

536 2S2

part of the breaker is excited by the contact segment ι to io swept by the switching arm d until the test relay T is made to respond via the switching arm c and the line C ₁ . The contact t _x of T interrupts the circuit of the rotary magnet D ₁ while by means of the contacts t ₂ and t ₃ the connecting lines La and Lb are switched through via the switching arms α and b of the preselector VW with the wires a _± and b _{x of} the selected connecting line.

It is now assumed that all of the connecting lines accessible from the preselector VW are busy. In this case the relay T cannot respond and the switching arms of the preselector are switched on up to the eleventh contact. Here the turning circle at the contact ^ is interrupted, so that the preselector is stopped. A busy signal is given to the calling subscriber via winding II of relay R. If he then hangs up his receiver, the relay R drops out. The circuit for the rotary magnet D is closed via the contact r _x and the contact t _{x of} the non-energized relay T, so that the preselector is returned to its rest position. In the position ο of the switching arm d , the turning circle at contact r _{x is} interrupted.

Claims (2)

Patent claims: i. Circuit arrangement for voters with free choice, which are brought into a special position when all accessible lines are busy, characterized in that the incremental device (D) of the voter in the position obtained when all accessible lines are busy (overflow contact of the selector) exclusively through the Call relay (R) is controlled by the circuit of the switching device being interrupted in the special position by a contact of the call relay and closed again when the excitation state changes by the call relay for the purpose of immediate return of the selector to the rest position. 2. Circuit arrangement according to claim i, characterized in that the call relay (R) has _{a single contact (V 1} ) arranged in the circuit of the switching device, the working position of which with - the closed contact in the rest position of the selector, a special one for returning the selector to the Rest position serving contact bank and whose rest position is connected to the overflow contact of this contact bank. For this purpose I sheet drawings