US2376248A

US2376248A - Telegraph system

Info

Publication number: US2376248A
Application number: US502247A
Authority: US
Inventors: Hanley Frank Harold
Original assignee: American Telephone and Telegraph Co Inc
Current assignee: AT&T Corp
Priority date: 1943-09-14
Filing date: 1943-09-14
Publication date: 1945-05-15
Anticipated expiration: 1962-05-15

Description

May`15, 1945.

E. HQHANLEY TELEGRAPH SYSTEM Filed sept. 14, 1945 4 l1N VEN TOR wahl/zeg l ATTORNEY Patented May 15, l1945 f '.llsfinyentin relatestd telegraph. systems nipi'enarticularly! tovi'mprovements in telegraph repeater sets utilized in such. systems.,

. telegraph repeaters certainYV types "it" isf tlepractice to yprovide' the' receiving relayl with what .ter'med 'a' vibrating. circuit". yfllhisf type.

l fA ciduit Ki's` wellA rlnownfin the artr and includes auxiliary windingsfon therelay inaddi'tion tothe usualline' winding.` The purposeof such. a vibrating circuit is tojcause accelerationV ofjtheV relay armature" and( thereby, cause' the relayr to operate more 'eil'cientl'yg Ifithe line` circuit of the. re-` peateris openedor disconnected which is usually theicaseifthe repeater 'is released or in a spare condition., the' vibrating; circuit kunless yalso opened oif'd'isabledwould take controland cause there-v lay", vto. "vibrate continuously. 4Such `vibration wouldbevery undesirabl'eas itwouldfcause rapid deterioration' .o'f vthe relay contacts. Consequently when the repeater is released means. must be'A provided for disabling thefvibrating circuitof thereceiving relay. Heretofore this' usually' has been 'd'onie -manuallyby the service board attendant'intvarious ways such,)for example,l as by removingthe battery or', the receiving. relay from therepeater. Such' additional` operations by the seri/ice; board' attendant are undesirablein that tifiey'are time' consuming and may be delayed or overlooked' with resulting trouble in the4 relay. The 'arrangements' 'o f the invention provide means whereby" .the normal operation ofvv the leg multiple relay unit individual to the repeater in question' `wi1l` automatically close the vibrating circuit when the repeater set is assigned or seized for use and will disable the vibrating circuit when the set is unassigned or released.- Other objects and features of the invention will appear more fully from the detailed -description thereof hereinafter given.

The invention may be more fully understood from the following description together with the accompanying drawing in the figure of which is shown a circuit diagram illustrating a preferred embodiment of the invention.

In the upper left-hand portion of the drawing is shown va type of metallic telegraph repeater set wellfknown in the art. This set comprises a receiving relay R and two sending relays S1 and S2. It would also include an auxiliary relay l and a relay 2 for changing the vrepeater from full duplex operation to half duplex operation. The receiving relay R would have a line winding 3 and two auxiliaryv windings 4 and 5. These auxiliary windings 4 and 5 and resistance 6 and condenser 'l would in prior arrangements be connected from l o e TEEGRAPH SYSFMT.

' Franknarola Hanley, Butler.: N..'J.,r1assigbrtar` .......Amenicarnflielephbne andi.Telegx-.aplt..0ompany, i f 'f.-'.arccrnonatiomofgNew Yorkw i l v, e i .fsf-claims.: (c1

f ual to each repeater.

.IHS-70V.

a ground (not. shown) connected tothe point 8' over. lthe armature. and` contactsor the relay Rg, to}l positive and. negative sources'. of Voltage. These two auxiliary wi'r'idingsqlv and, 5 constitute whatA is termed inv the'v art a vibrating circuit. ,Iii no currentfexisted in. the.. line winding` 3` ,of-the` relay R thev vibratingy circuit. would, cause the. armature off the. relay to. move. continuously back' and forth.'betweenv its contacts. ..Wl"1en the4 relay is beingv usedl the current inl"the line 'y'vind'ir'ign controls the. operation` of. the relayandit has.- been. found that.- the use yof` the. .v'iliiratingv circuit willy result in'` improved .operation `of the, relay causing accelerationot'. the 'relay armature operation. Under.V certain conditions no current will'. foWfin thel Winding. 3' (ifV the'l'ecevi`rlg,` r'elay. This. is usually the case when the,telegrapl'iY rel.l peater isunassignedor released from s'ervi'ceyle-ll cause under such conditionsit is not-thepractice'. ,y

to keep a lineconnected. to the. repeater. Accord-f ingly.unlessfthejvibrating circuit is .also dils'fr abled. the relay. would vibrate.k continuously' Vand this /wouldoc'ausef rapid. deterioration of its con'T tacts. Heretofore whengr-ound' vat 8` was confv nect'ed to the vibrating1 circuit. its disablingwas' accomplishedimanually by the repeater attendant either vby removing the batteries or'by removing the-receiving., relays, or.v in various other Ways. Inthearrangements of the`.invention, the vibrat- 'ingcircuit is. disabled. automatically at thepropery ti'rne.v by the llegi multiple relay unit shown in the lower right-hand portionfof thedrawing.` The` legv multiplerielfay unit an arrangement well known inthe' art, vand a unit isprovided' indivi'd' A leg multiple relay unit is described in U. S. Patent 2,349,586, dated May 23, 1944, to A. R. Bonorden et al, and is illustrated in Fig. `3 of said patent. The functions of the leg multiple relay unit are to enable the repeater to -be temporarily released or disconnected from 7 a hub circuit and when so released to be seized Y and associated by a patch with another hub circuit. Only so much of the leg multiple relay unit as is necessary for an understanding of the arrangements of the invention has been illustrated. Normally when the repeater of this invention is in operation' ground will be applied to the vibrating circuit over conductors I0 and Il and the back contact and armature of arelay in the leg peater from service the plug P1 will'be inserted in jack J1. This will close the following cir-cuit: fromv ground and battery I2, left-hand winding of tact of relay I1, conductor I 8, upper left-hand contact and armature of relay I6, conductors I9, 20 and 2|, winding'of relay 2, conductor 22 to battery 23 and ground. The opening of this circuit will release the relay 2. relay I6 and the release of relay 2 will close the following circuit: from ground, armature and contact of relay I 1, conductor I8, right-hand upper contact and armature of relay I B,

conductors

24 and 25, upper contact and armature of relay 2, conductor 26, windings of sending relays S2 and S1 to a source of 48 volt battery. This will cause the batteries associated with the relays Si'and S2 to send a spacing signal out over the sending line SL to indicate to the distant repeater that the repeater under consideration is no longer connected in service. The operation of relay 9 will remove the ground connected to its left-hand armature and thence over conductors I I and I to the vibrating `circuit and hence will disable the vibrating circuit.` As will be seen, this is done automatically while the leg multiple relay unit is performing one of its normal functions, namely, that of signaling to a distant repeater that the repeater under consideration is removed from service. In order to temporarily remove the repeater from service the leg multiple relay unit will also perform additional functions. However as these' are well known in the art and as'a description thereof is not necessary for an understanding of this invention no description ,thereof will be given. Should it now be desired to seize the released repeater for another service a connection would be made with the leg multiple jack J2. The sleeve of this connection would be grounded and accordingly would complete the following circuit: from the ground connected to the sleeve'of jack J2, conductors 21 and 28, lowercontact of relay I6, conductor 29, winding of relayV I1, conductor 30, -winding of relay 3l to battery and ground. This would operate relay Il. The operation of relay I 'lwould apply ground from its upper con- The operation `of,

tact and armature to conductor I0 and thus restore the vibrating circuit to an operable condition. Thus it will be seen that when it is desired to seize the repeater for use the leg multiple relay unit in performing one of its normal functions will automatically restore the disabled vibrating circuit so that it will again operate,

While the invention has been disclosed as embodied in certain specific forms which are deemed desirable, it is understood that it is capable of embodiment in many and other widely varied forms without departing from the spirit of the invention as defined by the appended claims.

What is claimed is:

41. A telegraph repeater including a receiving relay, a vibrating circuit for said relay, a leg multiple relay unit associated with said repeater, means in said unit for enabling said repeater to be temporarily disconnected from service, means controlled by the operation of said lastmentioned means for disabling said vibrating circuit, means in said u nit for enabling said repeater to be connected back into another servi-ce, and means controlled by the operation of said last mentioned means for restoring said vibratingV circuit into an operable condition.

2. A telegraph repeater including a receiving relay, a vibrating circuit for said relay, a leg mul tiple relay unit whose functions are to enable the repeater to be'temporarily released or disconnected from a hub circuit and when so released to be seized for use with another hub circuit, and means controlled by said leg multiple relay unit in performing said functions for automatically opening said vibrating circuit When said repeater is released and closing said vibrating circuit when said repeater is seized for use. 3. A telegraph repeater including a receiving relay, a vibrating circuit for said relay, a leg multiple relay unitfassociated with said repeater, relay means in said unit operated when said unit functions to release or dis-connect said repeater from a hub circuit, means for` completing said vibrating circuit over a contact of said relay means when said relay means is unoperated, a second relay means in said unit operated when said unit functions to seizev said repeater for use with another hub circuit, and means for completing said vibrating circuit over a contact of said .second relay means when said second relay is operated.

FRANK HAROLD HANLEY.