SU22104A1 - Central switch for telegraph nodes with thermal relay - Google Patents

Description

The present invention consists in a particular form of implementation of the central switch for the telegraph nodes of the employee for receiving call and burglar signals.

In FIG. 1 shows a switch diagram; FIG. 2 thermal switch installed in the switch.

The signaling mechanism of the switch is a thermal switch (Fig. 2) or a time relay made of two metal plates PLS with a different coefficient of thermal expansion, soldered together. A coil of insulated nickel-plated wire is worn on the plates; it is switched on via a signal call-out valve CL in the circuit of the local battery MB. The current flowing into the circuit of the valve and winding of the thermal switch is not sufficient to open the SJT valve, however, the winding of the thermal switch heats up the plate IfJI, bending, closes the contact 3, short-circuiting the relay winding, resulting in a current in the signal circuit of the 1CL signal valve amplifying and the latter opening . At this point, the thermal relay cools down, contact 3 opens and the relay is again ready for action.

If from the intermediate station of one telegraph circle it is necessary to transmit the telegram of the intermediate station of another telegraph circle, for this purpose a node station is called which connects the required circuits directly or via a broadcast (using a switch) with a switch at the end of the work is the switch signaling mechanism described above. The action of the switch as a whole is as follows. During operation on the linear wire, the LR relay periodically opens and closes contact 2, but the thermal relay does not come into action, since the total current flowing through its winding is not sufficient to heat it. The ringing signal, which is triggered by the call recorder CL, which registers the call, must last for a certain period of time (for example, twenty seconds), sufficient to heat the thermostat winding, accordingly in this case adjusted. After receiving the call at the junction station (the thermal relay has triggered and the AHL valve is open), the interrogation plug is inserted into the GN socket and then the required connection is made either to receive telegrams directly or to transfer telegrams to the line of another telegraph circle. The end of the work is also canceled by

press the key for a certain period of time, as a result of which the thermal relay is activated again.

In the middle of the spring of the GN socket, a resistance equal to the resistance of the clop is turned on, with the aim that the resistance of the circuits from switching on and off of the clamps will not change. For more efficient operation of the thermal relay, a small magnet NS is attached to its upper contact 3; when the submarine plate is heated and the contact 3 is closed, the latter is attracted by a magnet, but when it cools, it is held for some time, then it comes off and instantly moves to the desired distance from contact 3.

The subject matter of the invention.

A central switch for telegraph nodes with a thermal switch that serves to receive call and burglar signals, characterized in that the local battery circuit, which includes a thermal switch, consists of a call recording valve CL, whose thermal relay switches the winding of which is shorted by a relay 3 and kor 2 of the JIPj linear relay closing the local battery circuit when there is a call from the end station.

FIG. I.