DE600336C - Circuit arrangement for telephone systems - Google Patents

Description

GERMAN EMPIRE

ISSUED ON
JULY 21, 934

REICH PATENT OFFICE

PATENT LETTERING

JVl 600336 CLASS 21a ³ GROUP

S 95535 VIII φι & Date of the announcement of the grant of the patent:

1934

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

Circuit arrangement for telephone systems

Patented in the German Empire on December 13, 1929

The invention relates to a circuit arrangement for telephone systems in where connections from calling lines to lines at a workstation, which other workstations are assigned as calling lines are established.

Its purpose is to reduce the amount of time needed to indicate the status (vacant or occupied) of the

ίο connecting lines at the workplace of the Facilities serving civil servants in a particularly simple manner, namely this will achieved in that the connection devices at the workplace switching devices are assigned, which the connection of the connection line in Dependence on a switching measure at the workplace to which the requested line is assigned as the calling line.

In the figure, an embodiment of the invention is shown, namely two officers' places PL ₁ and PL ₂ with the associated interrogation and connection pawls AKl ₁ , AKl _% and VKl ₁ , VKl ₂ , in which the long- distance lines F ₁ and F ₂ end shown. The cord circuit used to establish the connection is only indicated schematically for place PL _1.

The arrangement works in the following way:

Arrives at work place PL ₁ on the

Line F ₁ receives a call, relay A ₁ responds via its I. winding, closes its contact 1% and thereby causes lamp ^ iL ₁ to light up via: earth, battery, lamp ^ L ^ contact Ia ₁ , earth. Relay A ₁ stays in the circuit: earth, contacts 10 ₁ , 2t _lt winding II of relay A ₁ , battery, earth. The officer then puts her plug 5Y ₁ into the jack AKl ₁ , whereby relay C ₁ responds via: earth, winding II and I of relay C ₁ , plug S ^ ₁ , jack AKIi, c-wire of line F ₁ to battery and Earth in the upstream connection (not shown). Relay C ₁ then shorts its high-resistance winding II through its contact 3C ₁ and thereby blocks the occupied line in a known manner against repeated occupancy. Simultaneously with the response of relay C ₁ and relay T ₁ is energized via: earth, battery, relay% T, c-conductor of the line F _1, pawl AKL _1, stopper St _1, relay C _1, earth. Relay T ₁ responds and opens its contacts 17J ₁ and 1Si ₁ , so that relay A ₁ cannot be energized again during the establishment and the existence of the connection by an incoming call over another multiple switched line _{with the line F 1} . Furthermore, relay C ₁ closes its contacts 4C ₁ and 5C ₁ .

The officer then places the keys T from layers 6 and 7 into layers 8 and 9, respectively, and thereby connects her interrogator Abf

*) The patentsitcher has given as the inventor:

Frits Wolf in Birkenwerder b. Berlin.

with the calling line P ₁ . She asks for it and then connects via a service line (not shown) with the officer at PL ₂ , to whom the desired line, e.g. B. P ₂ is assigned as the calling line. This second officer then indicates to the former the connecting pawl VKl ₂ arranged in its place, in which the desired long- _{distance line P 2} ends, and presses the button Tb ₂ , so that a circuit for relay C _{2 is} prepared.

The officer at PL ₁ then inserts her plug St ₂ into the latch _{VKl 2} and thus closes the circuit prepared for relay C ₂ , so that it responds via: earth, windings II and I of relay C ₂ , plug St ₂ , Jack VKl ₂ , c-wire of the line P ₂ , contact 10 of the switch operated by the button Tb « , relay T ₂ , battery, earth.

ReIaJsC ₂ closes its contact 11C ₂ and thereby causes, as a result of the short circuit of its winding II, the blocking of the occupied line against further occupancy. In addition, it closes its contacts i2c ₂ and 13C ₂ , which means that after the query key T has been returned to positions 6 and 7, the calling line P _{1 is} connected to the requested line P ₂ .

With the introduction of the plug Si ₂ in the latch VKl ₂ , relay T _{2 is also} addressed in the same circuit with relay C ₂ and has opened its contacts 14 ^ ₂ and I = Ji ₂ , so that relay A ₂ may have a other incoming call with the line P ₂ multiple switched trunk line can not be excited.

If the conversation is over and the officer at PL _{1 has received} the final signal in a known and therefore not shown manner, she pulls the plugs St ₁ and St ₂ . As a result, the circuits for C ₁ and T _{1 are} interrupted, so that these relays drop out. There are thus the contacts 3C _1, opened 4C ₁ and Sc ₁ and ¹ Zt _1, iyt _ly 18 ^ ₁ and 2II ₁ closed. In addition, the circuit for the relays C ₂ and T _{2 is} interrupted, so that the contacts 11C ₂ ; I2C ₂ and 13C ₂ open and 14 ^ ₂ , iS ^ j 164 and 194 are closed. Since the button To _{2 is} still pressed, the officer at PL ₂ receives earth by lighting the lamp SL ₂ via earth, battery, contact i6i ₂ , lamp SL ₂ , closed contact 20 of the switch operated by button Tb ₂ the sign that the conversation has ended. She puts the switch T & _{2 back} in the starting position, so that the facilities of the system are again in the idle state.

Claims (3)

Patent claims: ι. S circuit arrangement for telephone systems in which connections of calling lines with lines which are assigned to other workstations than calling lines are made at a workplace, characterized in that switching devices (C ₁ , C ₂ ) are assigned to the connection devices (cord circuits) at the workplace which cause the connection to the connection establishing the connection depending on a switching measure (pressing the buttons To ₂ , Ta ₁ ) of the workplace to which the requested line is assigned as the calling line. 2. Circuit arrangement according to claim i, characterized in that the switching through is effected by a relay (C ₁ , C ₂ ) assigned to the cord circuit, the exciter circuit of which is assigned by the officer at the workplace to which the requested line is assigned as the calling line , is closed. 3. Circuit arrangement according to claim 2, characterized in that when the excitation circuit of the relay (C ₁ , C ₂ ) is closed, the circuit of a character indicating the disconnection of the connection (SL ₂ ) is prepared. 1 sheet of drawings Berlin, depressed IK the