SU16268A1 - Telephone switch - Google Patents

Description

In the presently accepted switches for devices with phonical call, all the telephones are connected in parallel with one of the signal telephones located on the switch itself. To distinguish a call from one subscriber to another, it is necessary for each subscriber to assign a certain number of beeps, which limits the number of subscribers. When several subscribers are called simultaneously, it is difficult to find them. I

The present invention aims to eliminate these disadvantages.

In FIG. 1 shows a switch diagram; FIG. 2-diagrams of telephone devices before the call; FIG. 3-at call, fig. 4-when talking and FIG. 5-checkout scheme „for a conversation

Line wires ij and L (Fig. 1) from those of the background devices A, A with microphones Ж, Jfj and T, T phones ... go to jacks E, E ..., then to the buttons KI, KZ ... from where the ballast resistances RI, R2 ... are connected to the common telephone To, the ballast resistances jRi, jRa- are switched on in case the switch is called when a short circuit is closed. The constant j inductor J is switched in series.

with the index indicator H between the ground and the wire N, to which the buttons are connected in parallel, K ... The lever P serves to alternately press the buttons KI, K ... The disk D is provided with cut-outs b for entering the tooth S of the number indicator N. Capacitors C, C ... (Figs. 2 and 5) prevent the passage of direct current.

In the quiescent position, the phonetic apparatuses, adventured to the commutator, have the scheme shown in FIG. 2, where Тгз Trz.-.- secondary windings of transformers Ti, Тг-2 ... when calling, the device has the circuit shown in FIG. 3, and during the conversation of subscribers, in FIG. four.

When receiving a call that is applied by simply pressing the call button K (Fig. 3) on the device, the person on duty rotates the inductor / sends a direct current through one number index for all to the common wire and at the same time rotates the lever P, which alternately presses the buttons K , Kz, etc. When the caller’s button is pressed, the direct current will pass through the index plate, the valve will disappear, the tooth S will fall into the notch B of the D disk and the disk will stop, indicating the number of the caller Abn1 || A.,;. ,.,; ..,. „

To determine when the call ends, the attendant checks the connection made. This is achieved by temporarily plugging the dc-direct current through some self-closing valve, to a pair of connected devices. If the devices are in action (Fig. 4), then the current will pass, the valve will open and the lines will be considered occupied. If the subscribers stopped talking (Fig. 5), then the current will not pass, the valve will not open and the person on duty may disconnect.

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The subject of the patent.

Telephone switchboard by phonic call system, characterized by

using: a) inductor constant ,. current 1u connected in series with the jomeric pointer H between ground and wire L, to which the buttons AI, K.,. are connected in parallel, each of which is connected to the line of one of the telephone devices -41, of a phonic call system; b) P1 P1, designed to press the Kz buttons, with the goal of including the AI, A telephones one after the other in the inductor and number circuit, and sending a direct current to the line of each of them to detect the calling line, in the rest position, the capacitor C is turned off during a call and a conversation.

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