SU34022A1 - Telephone switch - Google Patents

Description

Existing on the local battery mbmmutator, the burglar alarms have that significant disadvantage, which does not give a clearly expressed signal about the end of the conversation. The burglar valve reacts in the same way both to the pick-up signal and the end-to-end call, and it’s very difficult to distinguish the conditional pick-off pick-up signals when connecting several pairs of subscribers. In the proposed telephone switchboard of the local battery system, it is proposed to eliminate the above disadvantage by inserting a burglary relay in the shut-off valve circuit that closes the chain of signal lamps at the specified station so that the 6-batch relay operates only when the subscriber has a special bounce button installed on the subscriber.

In FIG. 1 and 2 depict two variants of the electrical circuitry of the proposed switch; FIG. 3 and 4-part switch device.

Each subscriber has one capacitor 6 installed (fig. 1 and 2) with a capacitance of 2 ji and an ordinary bell button 7. The capacitor is connected in series to one of the incoming line wires, and the button is parallel to both the incoming wires so that, when pressed, it bypasses the entire subscriber installation, giving a short circuit to the station.

(294)

At the central station the existing baffle valve is adapted as follows. The valve door is removed. A copper square / (Fig. 1, 2 and 3) with a contact screw is installed above the tongue of the valve core, on the front side of the switch. The latter, in the rest position of the valve, is connected to the tongue of the core, giving hard contact. A capacitor of 2 jF in series is connected to the by-pass valve circuit.

The breaker relay is installed in a separate box. A flat contact spring 5 (FIGS. 1, 2 and 4) is soldered to the upper part of the core, over its axis, which passes into the inside of the box. A copper square with a contact screw 4 (Fig. 4) is installed above the spring. The door at the relay is also removed. A bouncing light bulb with a voltage of 12-24 volts is installed over each breaker valve on the switch.

The switch action is as follows. When the subscriber who received the connection calls to another, the burglar valve works normally, but the inductor current branching off to the burglar relay does not act on this relay, since at each current pulse the burglar valve interrupts the current path to the specified burglar relay.

When the subscriber, having finished the conversation, presses call button 7 and this will give

“A short connection of the linear wires, the current from the central battery goes through the circuit: battery, measles relay, relay winding, plug case, bell button at the subscriber and back plug head, body of the baffle valve, contact / and battery. The burglary relay pritu no measles and closes the second circuit: battery, measles relay, pin 3, bouncing light bulb, -battery.

According to the scheme of the 1st variant, the bounce lamp will be lit only while the subscriber is holding the button pressed.

According to the scheme of the 2nd version, the breakaway relay has two windings: the main one and the additional one (local), which is wound onto the main one.

Under each pair of plugs, contact 5 is established, which is open when the plugs are in normal position, and when the plug is raised (i.e., located in the switch sockets), it is closed.

When the subscriber presses the button 7, the burglary relay will work and close the second circuit: battery, measles relay, pin 3,

The local driver, relay, contact-.5, a light bulb and a battery. Under the action of the local winding, the measles of the relay will remain turned on and the light will remain on until the telephone operator, by removing the plugs from the sockets, will lower them into place, thus closing the signal lamp circuit in the co-tact 5.

If the switch has a talking key according to the scheme of the 1st option, then a capacitor in 1 II.FI should be included in the circuit of the hearing instrument, the telephone operator from the case of the plugs, in the case of the 2nd option, the capacitor is not needed.

The subject matter of the invention.

A telephone switchboard of a system, a local battery, characterized in that a circuit of fender valves includes burglary reAe, closing at the central station a chain of signal lamps so that the burglary relay operates only when the line is bridged by a button installed at the subscriber. /

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