SU69355A1 - Device for interlocking paired telephones - Google Patents

Description

A device is proposed for interlocking paired telephone sets using blocking and releasing telephone relays included in the calling circuits of subscribers.

A feature of the proposed device is the installation of a blocking relay connected to the circuit of one subscriber, together with a releasing relay connected to the circuit of the other subscriber; this blocking relay is provided with a lug on the cortex, which serves to engage a latch that mechanically locks the first relay upon call and releases it in the event of a release relay tripping.

FIG. I shows the electrical circuit of the device proposed in FIG. 2 shows the mutual arrangement of the blocking and releasing relay; in FIG. 3 is a view of the blocking relay from the end; FIG. 4 and 5 - the blocking mechanism and the mutual arrangement of the clamp 7 and the spring 3 with the unexcited blocking relay (Fig. 4) and the excited relay (Fig. 5).

As can be seen from FIG. 1, a call from the station is sent to each of the paired subscribers via a single-wire circuit (subscriber A through wire L and subscriber B through wire L) with the return of the ringing current through the ground.

Having received a call, or on its own initiative, one of the subscribers, for example, subscriber A, picks up the phone. This forms a circuit: wire L-, contact g relay P, clip D, contact of the lever of the handset, subscriber unit A, clip Lz, contacts a relay P kb relay P, winding of the releasing relay P, wire L.

Relay P triggers and opens its contact, and as a result, the tongue is removed from the winding of the blocking relay PJ ,. The latter is triggered sequentially from the relay P along the same circuit and, opening its contacts PI-b and PI-g, disconnects the other subscriber's device B from the line.

The contact closure prepares: a circuit for the operation of the relay P is aborted, and the contact P is shunting the coil of the relay P.

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The relay P releases its measles and shunts again the contact 4 of the relay I with its contact.

However, the relay P, once closed, the core still does not let go, since it, having operated, turns out to be mechanically blocked by means of a latch 7 (Figs. 4 and 5).

Dialing and conversation is carried out along the circuit: wire L, contact, clip Aj, contact of the lever of the handset, subscriber unit A, clip Lz, contacts, and wire Lz. This circuit is free of any additional resistance.

At the end of the call, subscriber A is broadcasting the handset, but there is still no release at the station, since the relay Rd is connected to the line via a line: wire L, relay winding Pg, contact PJ-a, terminal A, subscriber's device A, terminal A, Pj-a, RZ-b and PI-e, wire L.

Relay RZ, triggered, releases the relay PI from mechanical interlock. The latter releases the measles, as a result of which the circuit returns to its initial state, the relay Pg releases, and the station receives a release signal.

The operation of the circuit during the conversation of the other subscriber B is completed in a similar way, with the only difference that instead of relay Pj, the relay works, and relay Pg and P change their roles.

As shown in FIG. 2, blocking P- (PZ) and releasing P (P relays are located one below the other. The blocking mechanism consists of two parts: clamp 7 with screw 2 and spring 3. The clamp and spring are made by stamping from phosphorous bronze ( other materials).

The clamp 7 is attached to the upper relay bark (Fig. 3) with the same two screws 4 that secure the bridge to the bridge.

Przokina 3 is set to

the lower relay is exactly the same as regular contact groups.

Only one condition is imposed on the adjustment of the locking mechanism — a snapping should occur after all the contacts are switched, in the extreme position of the core.

The adjustment is made by rotating screw 2 (moving the end of the clamp along the relay) and bending the spring 3 (changing the spring pressure on the clamp).

The use of mutual mechanical interlocking of paired telephones eliminates the need for extraneous current sources and makes it possible to completely free the dialing and talking circuit from including additional resistances in the form of relay windings (as is the case in circuits without mechanical interlocking).

In the proposed device, there is no self-shunting or self-switching of the relay, which is the reason for the failure of the known circuits with mechanical interlocking.

The lack of self-bonding greatly simplifies the design and adjustment of the mechanical latching device.

Subject invention

A device for interlocking paired telephone sets using blocking and releasing telephone relays included in subscriber calling circuits, characterized in that the interlocking relay connected to one subscriber circuit is installed adjacent to the other subscriber circuit and is provided with The crust is the clamp that serves to engage a latch that mechanically locks the first relay during a call and releases it in the event of a release of the relay when it is cleared.

9. Code BJ 9.

FIG. 2

 vm

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FIG. 3

FIG. four

3 /

FIG. five