SU6076A1 - Switch for intermediate telephone station - Google Patents

Description

The invention is intended to be obtained with the help of the smallest possible number of aparats, a simple installation that would satisfy all the requirements for signaling. For this purpose, the DC call is inserted into the conversational wires at the intermediate station so that when connected to the terminal station, the signal currents, such as calling and burglar, pass into the windings of the call through its self-terminating contact, while microphone passes only through the windings of this call.

The drawing shows a circuit with the following designations: ZW is an intermediate station; S-subscriber terminal station; a central station that can be performed for manual or automatic operation.

The end station is a regular subscriber station without full extension signaling devices to an intermediate station. At the intermediate station is a lever switch HS, the shoulders of which are marked, and its position is 1-3.

The subscriber removes the auditory tube, as a result of which the signal current circuit comes into action from the central station battery via resistance w, contact t, wire a, winding W of the bell, choke coil Ur. contact arm I at position 1, terminal station (subscriber) E, contact arm III, position 1 of the lever switch SS, winding 1. call DC OW, interrupting contact C7, winding 2 ring GW t ground. Due to the establishment of this circuit, the direct current sounds are activated, and its interruptions are heard in the auditory tube of the terminal station. Prv

For an automatic central station, this serves the subscriber as an acoustic signal; if the signal stops, it is necessary to select first. Pa intermediate station HS switch is moved to position 2. As a result, the following current current closes: from the central station battery through resistance w, t, a, contact arm IT, contact arm I, winding I of the DC bell, contact arm 1, position 2, terminal station, contact arm III, Y, b, L, call relay AR and ground. As a result, the analyzer comes with a pre-selector at the automatic station, and the lamp is normally switched on at the hand-operated stations.

When the central station is connected to the desired subscriber, the working contacts t, t pass the supply current from the central station through the wires and, b in the same way as the above-mentioned calling current to the central station A. Talking currents pass through this through the capacitor Cs. In the power supply circuit, there is only a winding 1 of the GW ring of direct current, which results in a prolonged opening of the interrupting contact U. The winding 2 of the ringing device G-W is turned off by the E self-interrupting contact U, since it is connected to it in the shunt circuit relative to the speaker wires.

If the terminal station hangs up its auditory tube at the end of the conversation, then the connection to the central station occurs as a result. Then there is no more supply current, and the holding winding 1 of the bell of the direct current loses excitation, and the contact U closes. As a result, the signal current circuit, which causes the sound (as an interception signal for the intermediate station ZW) of the DC call GW, closes: the central station battery, the resistance W, ti, a, IT, II, the winding 1 of the call GW, the interrupting contact U, the winding 2 calls GW ,. land The intermediate station returns its HS switch to its original position.

With a conversational connection between the intermediate station and terminal.

ZW slider / kit station moves its HS switch to position 3 and removes the ear tube from the hook. The call is made using inductor J. The power supply current passes as follows: battery at the central station W, ti, a, one winding W of the bell, choke, shoulder IV in position 3; then current. It is divided and goes partly through the contact h of the auditory tube to the intermediate station apparatus, shoulder V, choke G2, ground, and partly across arm II, winding 1 of the DC bell OW, shoulder 1, terminal station. Е, III, V, choke coil Dr ,, ground. By the current of this circuit, the call of the direct current GW is continuously excited; therefore, the interrupting contact U is open for a long time, so that the DC call does not take effect. The side switch on the switch lever, which closes in the third position of the HS switch, turns on the capacitor Cs, which prevents eavesdropping on the wires of the central station, in case the coils are throttled, Dr should not be significant.

When the end station is called, the central station sends an alternating current, either automatically or by hand, through the wires. b to an intermediate station ZW. The W call of the intermediate station sounds, prome: “The specified station picks up its hook off the hook and can now speak to the central station, as well as to the subscriber, who is connected to the central station. If a terminal E subscriber is required, the intermediate station calls the end station using inductor J and moves the switch to the second position. If the terminal station is withdrawn, the intermediate station again hangs its auditory tube. The supply current now passes as in the outgoing connection. Signaling about the end of the conversation occurs in the same way as described above.

The subject of the patent.

Switch for intermediate telephone station intended

for telephone communication with the central stations of the central battery system, characterized by use, in order to eliminate the special wires between the intermediate station ZW and the subscriber E, the DC call GW with two windings 1 and 2 and the self-interrupting contact U, for which call winding 1 is turned on in price

the microphone supply current (the talk circuit is such that, when the current passes through it, the contact U. included in the circuit of winding 2, is disconnected, and the winding 2 is turned off, when the current in winding 1 stops, the contact V closes, so that call signal and pick-up currents passed through both windings 1 and 2 and contact U.

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