USRE12739E - Telegraph system - Google Patents

Description

JOHN J. GHEGAN, OF NEWARK, NEW JERSEY.

TELEGRAPH systrnmi ori lm No. 872.228. and November 26. 1907. Serial No. 385.440.

To o li whom it may concern:

, Be it known thatv I,-JonN J. GHEGAN, a

" citizen of the United States of America, re-

siding in the city of Newark, in the county of Essex, in the State of New Jersey, have invented certain new and useful Improvements is a specificatio a Telegraph. ystems, of which the following i In quadruple]: telegra h systems employing neutral and polarlze relays, there is experienced a practical difiiculty because of the production of false signals or kicks in the coal sounder of the neutral relay through the action upon the latter of the working of the pole changing transmitter, this kick being produced I; the moment of reversal or nocurrent. hisdifliculty is well known, and attempts have been ,made to overcome it, but not with entire success.

The object of my invention is to eliminate this false si al or "kick difficulty and this I accomplish by providing means controlled by the armature of the neutral rela to act on its local sounder circuitv so t at the sounder will be unaffected.

In the accompanying drawings Figure 1 is a diagram illustrating one form of my invention; Fig. 2 is a diagram of a modification; and 3 is a diagram illustrating another modification. 1

In these diagrams I have omitted, for the sake of clearness, illustration of those parts of the usual quadruplex system which form no essential part of my invention, and which are'well known and common in the art.

Fig. 1 represents some ofthe devices at one of the stations on the line, and N. R. indicates the ordinary differentially wound neutral relay, which is supposed to respond on] to changes of otential'at the distant en regardless of o arity, while P. R. indicates the polarize rela at the same station with its local sounder In ractice, at the instant of no current of big potential reversals at the distant end to operate the polarized relay P. R. at the receiving end, the neutral relay N. R. at the receiving end will be affected to produce a false signal or kick in its sounder as ordinaril connected.- This sounder is indicated in ig."1 at S and is shown as connected ina local circuit 14 with battery a b, thislocal circuit being closed to actuate'the sounder b withdrawal of the,

' V armature lever. 10 er -the action of its spring 11 the backstop 12.

Specification of Reissued Letters lPatent.

Beissued Jan. 14, 1908.

Application for reissue filed December 7, 190']. Serial No. 405-629:

In" that formof my invention which is shown in Fig.1, I eliminate the false.kick by providing means for momentarily opening the local sounder circuit 14 at the instant it would otherwise be closed by the neutral relay armature. For this purpose I may rovide adjacent to the armature lever 10, a

ever P, one end of which lies in the path of the lever 10, while the other end normally bears against a stop 13 in a circuit containing a battery 0 band rimary coil 17 of an induction coil I. C. '1 1e secondary coil 18 of this induction coil is in closed circuit with an electromagnet R, with it armature lever 16 normally held against a s op 15 in the local sounder circuit 14, the armature lever 16 being also in that circuit.

The operation of this arrangement is as follo"ws.:,1VVhen the armature lever 10 of the neutral relay N. R. is released at the moment of no current, and. is drawn back by its spring 11 towards its back stop 12, it first strikes the lower end of lever P and draws its upper end away from stop 13, thus breakin the local cricuit containin the primary 17 0% the induction coil. I. C. This causes a momentary current in the seconda circuit and a like momentary energizin o the electromagnet R. This moment 0 energy is sufficient to attract the armature 16 and to therefore break the local sounder circuit for an instant at 15, as indicated in the diagram, Fig. 1,- and consequently the false signal is prevented from being sounded at S.

It will be understood, of course, that this interruption of the sounder circuit being only momentary, it does not materially interfere with the varying potential signals sent from the transmitter at the distant station.

Instead of thus breaking the local sounder circuit of the neutral relay to prevent false signals, I may accomplish'the same result b momentarily short circuiting the local circuit contacts of the neutral relay, as indicated in the diagram, Fig. 2. This diagram corresponds as to the main parts with-"that shown in Fig. 1, but instead of providing for a break in the local circuit 14 at the back stop 15 (Fi 1), I make that circuit continuous from t e battery s b to the sounder S, (Fig. 2), a'ndl provide a short circuit across the circuit 14 between the relay N R and sounder S by connecting .a wire 21 from an armature lever lfi and a wire 20 from the front stop of that armature. I have also shown the nanrelay as arranged to close -its local sounder circuit 14 on its front stop 121, as

will bereadily understood. When the backfiard movement of the armature lever causes the breaking of the circuit containing I theprimary '17, and the electromagnet is ther y momentarily ener zed and its arma ture' lever 16 attracted, t e contacts of the neutral relay will be for tire instant short circuited through the 'Wireglever 16, stop '19, and wire 20, to prevent the sounding of the false signal, 4

It will be understood that the lever P may be dispensed with, and the circuit of the primary coil 17 broken by othersuitable means, such as the provision of extra contacts on the armature lever offthe neutral relay- N. R., thus in Fig. 3 I hdve indicated that armature lever as adapted'tocooperate witha contact 131 in the circuit of the said primary to at-' tain the samer'esults as heretofore described may be applied to a the induction is so heavy as'to cause chatterorvibration ,of a relay armature as well as with reference to Figs. 1 and 2.

This invention for lpreventin false signals telegrap lines, where .on lines operatedby rapidly alternating currents. V

- I claimasmy invention 4 relay to prevent false signals.

lay to momentarily open the local sounder circuit of the relay to prevent false signals.

3. A telegraph instrument, comprising a relay andv its armature and a local sounder controlled by the relay in combination with means, including an induction coil, controlled bythe armature of the relay to momentarily open the local sounder circuit 'of the' relay to preventfalse si als.

4. A tiua'drup ex tele aph system, having a neutra relay and a po arized relay and-their local'sounder circuits in combination meansfincludi'ng an 'indnction coil, controlled by the armature of the-'Tueutral relayto act on the local sounder-circuit Ofthejneiitral 5. A uadruplex telegraph 'ystem having a neutral-relay and'a' polarized relay and their local sounder circuits m' combination with meansicoiitrolled by thearmatureof theneutral relay' to momentarilyo en the local" l relay to pre-' sounder'circuit of the neutra vent false signals; ,7

6. A uadrupliextele aphv syi'tem, having a neutr relay and a relay and their local. sounder circuits in combination with means, including an induction coil controlled byl-the armature of the neutra relay to momentarily olpen the local sounder ,cir

cuit of the neutra nals. A H v a In'testimony whereof I have signed my name to'this specification, ii the presence of relay to prevent false sigtwo subscribing witnesses.-

JOHN J, Garc a Witnesses; v .l

L. H. Gnoi'rn, HUBER: How- N!

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