DE570938C - Circuit arrangement for telephone systems with intercom stations which are provided with self-loading devices - Google Patents

Description

GERMAN EMPIRE

ISSUED ON FEBRUARY 21, 1933

REICH PATENT OFFICE

PATENT LETTERING

CLASS 21a ³ GROUP 80

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

Circuit arrangement for telephone systems with call stations, which are provided with self-loading devices

Patented in the German Empire on December 29, 1927

The invention relates to telephone systems with call stations with self-loading devices are provided. As soon as these microphone units operate their self-loading devices from a Officials are monitored using a sound device when inserting coins transmits various signals to the officer depending on the type of coin inserted, required.

The well-known institutions are now attached to the shortcomings that the participant Signals from the sound device hears, so that he is given the opportunity to go through any measures at the intercom station to imitate the signals without inserting a coin to get a connection.

The aim of the invention is to maintain the acoustic identification at the workplace the microphone units the possibility of imitating this acoustic marking gain weight. It achieves this in that when the self-loading device is actuated (e.g. insertion of a coin) by a vibration generator assigned to it above a frequency Audibility is achieved, which affects auxiliary equipment at the monitoring station, to activate the self-loading device by triggering an acoustic signal at the monitoring station to be marked.

Figs. 1 and 2 show an embodiment of the invention. Using this The concept of the invention will be described in more detail.

If the subscriber N wants to establish a connection via a switchboard, he stimulates his preselector VW via earth, winding of the relay R ₁ contact 2 1, microphone, transmitter Ue ¹ , impulse contact J ₁ hook switch HU ₁ contact It ₁ resistance Wi when he lifts his receiver ₁ battery, earth for free choice of a group voter. After the selection of the preselector, the relay T speaks over: earth, battery, winding of the relay T, c-arm of the preselector VW, contact 5 m, resistance Wi ₁ earth (parallel to this over winding I of the relay C, contact 6 £, Earth) and switches the connection line through to contacts 3 t and 4 1 to the group selector, so that in addition to relay C, relays A and B also respond. Relay V is excited via contact gc (earth, battery, contact ge, winding II of relay C, contact 8 a, relay V ¹ , earth). -

By actuating the impulse contact / the relay A of the occupied group selector is abruptly released in a known manner.

*.! The patent seeker stated as the inventor:

Dr. Maximilian Mathias in Berlin.

excited. According to the current surges, the lifting magnet H of the group selector is excited via: earth, contacts 12 W ₁ τια, low ¹ , lifting magnet H ₁ battery, earth '. If, after the series of impulses, relay V ² , which was energized when relay A dropped out by lifting the short circuit, drops out again due to a short circuit via contact 8 α , the group selector can be freely selected by rotating solenoid D via: earth, contacts x & k , ijp, ιόν ² , χζν ¹ , 13 d, rotary magnet D ₁ battery, earth is excited. If the group selector has found a vacant operator position, relay P speaks via:> 5 earth, windings I and II of relay P ₁ contact 20 v ¹ , c'-arm of the group selector, c ² - wire, relay A ¹ , battery, Earth and by short-circuiting its winding II blocks the connecting pawl against any further assignment via the contact ig p. At the attendant call lamp AL is lit on Earth, contact 24 a ^1, handle contact A ', call lamp AL ₁ battery, earth. When the interrogation plug is inserted, the AL call lamp on the jack contact K is switched off. The officer then queries in a known manner and establishes the desired connection via her connection devices, which are only incompletely shown in the figures because they are of no importance for the concept of the invention. If a connection is required that requires a fee, the officer asks the participant to insert one or more coins. As a result, the different coin contacts (e.g. MK ¹ , MK ² ) are actuated depending on the type of coin. These coin contacts close different oscillation circles in the oscillation generator R ¹ depending on the actuation of one or the other or all of the coin contacts . The frequency of the generated oscillation has in any case such a level that it lies outside the audio frequencies. To monitor the insertion of coins, the officer will therefore press the Ta button, which turns on the heating battery of the cathode of the vibration generator R ² and thus sends an auxiliary oscillation via the transmitter Ue ^s to the interrogation device. This oscillation, which lies outside the audible range, creates an interference oscillation inside in conjunction with the oscillation generated in the coin cashier by the oscillation circuit LC ¹ or ^{LC 2} , which differs slightly from the auxiliary oscillation but is still outside the audible area of the listening area. ^{This tone indicates the 1} coin slot to the officer at the operator station. .

If the officer releases the Ta button, the auxiliary oscillation is switched off. Since the vibration emitted by the payphone is outside the audible range, the subscriber will not have the opportunity to imitate the signals generated when the coin operated contacts are operated and thus establish a connection free of charge.

Claims (2)

Patent claims: 1. Circuit arrangement for telephone systems with intercom stations with self-loading devices are provided, characterized in that upon actuation of the self-loading device (ζ. Β. throw-in a coin) by means of a vibration generator assigned to it, a frequency above audibility is achieved comes that acts on auxiliary equipment at the monitoring station to an operation the self-loading device by triggering an acoustic signal at the monitoring station. 2. Circuit arrangement according to An-Spruch ι for the production of different values Connections, characterized in that the frequency of the vibration generator is determined by the type of actuation the self-loading device (insertion of different or several coins) is determined. 1 sheet of drawings