US1024088A - Signal-transmitter for telephone-exchanges. - Google Patents

Description

G. W` LORIMER.' SIGNAL TRANSMHTER PoR TELEPHONE EXCHANGES.

` APPLICATION FILED A`PE.11, 1906. RENEWED AUG. 7, 1911. 1,024,088.

O O O :5555:: Q

o G 0 E mw G. W. LORIMBR. SIGNAL TRANSMITTER FOR TELEPHONE EXCHANGES. APPLICATION FILED APR.11, 1906. BENEWED AUG. 7, 1911. Ig Patented Apr. 23, 1912 G. W. LQRIMER. SIGNAL TRANSMITTER FOR TELEPHONE EXCHANGES. PPLIGATIN FILED APB.. 11, 1966. BBNEWED AUG. 7, 1911. :i gggggsgggf, V Patented Apr. 23, 1912.

6 SHEETS-SHEET 3.

G. W. LORIMER. SIGNAL TRANSMITTER P03 TELTPHQNE EXCHANGES. I lAPPLICATION IILBDYAPE. 11, H906. BENEWED AUG. 7, 1911.

Patented Apr. 23, l92.

6 SHEETS-SHEET 4.

lill@ G. W. LORIMBR.. SIGNAL TRANSMITTER FORTBLEPHONE EXCHANGES.

APPLIGATIONPILED APB..11, 1906. RENEWBD AUG. 7, 1911.

Patented @1129. w12.

e SHEETS-SHEET 5.

G. W. LORIMER. SIGNAL TRANSMITTER 120B. TELEPHONE EXCHANGES. APPLEGATION FILED APB.. 11, 1906. RENEWED AUG. 7, 1911. f Eatented Apz. 23, 1912 6 SHEETS-SHEET 6.

. Longman, fvenra desired to be selected.

UNITE GEORGE W. Lorrains, or moua, omo, Assiettes, su musas .assieme/Innes, ro WESTERN ELECTRIC COMPANY, A consonantes or ILLINOIS.

SIGNAL-TRANSMITTER FOR TELEPHONE-EXCHANGES.

Specification. of Letters Patent.

rasanten api. as, wie.

Application filed April 11, 1906, Serial No. 311,139. Renewed August 7, 19M. Serial No. 642,818.

Be, it known that I, Geenen WV. Lonnmn, a citizen of the United States ot America, and a resident ot Piqua, county of Miami, and State of Ohio, have invented a new and useful Improvement in Signal-Transmitters for Telephone-EXchanges, of which the following is a speclication.

M v invention relates to substation equipments in automatic telephone exchanges, and has t'or its object the transn'lission and control of electri :al signals or impulses by 'ay ot the telephone line between the substation and the central olHcc, and the prevention ot' accidental or intentional interference with the transmission and control of these impulses or signals by a wrong act on the part of a person operating my invention.

The general character of the automatic exchange system with which my invention is designed to operate is as follows: The cen-- tral oiliec contains eircuit-selectingl switches so related to each other and to other circuitcontrolling devices lo enable any line entering the central olliec to be placed in connection with any other line entering the central oliiee and not already engaged. The circuit-selecting switches andY their associated devices are ot' a type in which certain of the operationsare performed by the rotation ot' circuit-carrying brushes over circuit-carrying contacts, this rotation being adapted to he arrested at a time when the brushes are in engagement with the contacts This central oiiice equipment and the device ot in v present invention are adapted for use with ltelephone lines of two wires each. The earth may serve as a third conductor t'or common use hy the many substations and the central oflice. or in lieu of the earth a. common return conductor may he used. Electric current for the operation of the circuit-selectinff switches and associated devices in the centrzil o'liice and of electromagnetic mechanism at the substation is provided from some convenient source, preferably located in the central otlice.

Upon a call beine instituted by a. substation, t-he central o ce mechanism responds to the temporary grounding of one of the wires leading to the substationand as a resultot current tlowing from the central oilice over that Wire to the substation ground places the lineso calling in a relation to the 'circuit-selecting switches such that the succeeding operations of selecting the called line may proceed. vin 'this process of selecting,r the-called line the central otlice equipment sends impulses to the substation, these passing over thc wire ol thevline which. was not used for the preliminary impulse above des ibed. The result of this series of impulses is to produce synchronous motion of parts4 in the substation and in the, central otlice. "lhe circuits and moving parts in the central otlice are so, arranged that when, during this series of impulses over one ot the wires, a ground shall be placed vtempinarily on the other wire atthe substation, the circuit-selecting switch then in motion at the central oliice will he arrested in its motion as a result of the impulse caused by that grounding. As a plurality ot'central office switches may be associated successively with the calling line, one at each of several'dit ferent oil the setting up of a connection, so the entire series of impulses under description may be divided into several groups, each corresponding to the progressi ve motion of one central. office switch, and each adapted to stop that motion when an impulse is produced, as described, in the wire not used for the series of impulses which control synchronism.

It is thus the object of my invention to respond to impulses in one circuit and by motion of itsv parts to malte such contacts as will cause impulses in another-circuit, to the. end ot' placing its own line in connection with a desired other line.

ity invent-ion is illustrated in the follow-- ing drawings 'in which similar letters refer` to similar parts throughout the several views, and in which:

Figure l is a front view; Fig. 2 va rear view; Fig. 3 a rear view with certain parts removed; Fig. t a view of the hook switch for the telephone receiver; Fig. 5 a section on a central line indicated in Fig. F2; Fig.

6 a detail ot' the gear train; Fig. 7 a sectional view as indicated in Fig. 2; Fig. 8 a sectional View as indicated in Fig. 2, Fig.4 9 a circuit of an instrument embodying my invention. Fig. 10 is a circuit diagram of portions of the central oicc circuits and apparatus involved in the operation of the call sending device described Vin this pplieation. Myinvention is adapted to he 4.associated with telephone iistrnn'ients of the usual type, hitting a tra` .emitter and a receiver with sueh other elements are requishe for the t a pro" f' substation telephone ii the particular system cator hy which the si'ihsoriher may set op lily before him t digits of the number the linel'ie wishes to eall. iueh an indi for use 'with 'my press invention reto he able to inalie certain connections later herein, and nuN "1121er uit tei-nis i limita- "52 t other M i n is viewed and the rotation l the ligure showso le? S and .35 it will il. supports all ure ot' the driven train `oit led hy oertain red hy the shaft l2 and rnu down by the ropement 311-. The spring by n driven is l5, one end or' ed to the disk 1G, hy the post :u: other the post E8 with which "sl: 'i6 in conventi-ie. This post. 18 is atti ed to the is joined hy the link i l 1 more elearlj. shown in Fig. C. ifnis junction is on. smh surf: in the two disks and at such angular positions. as to eause ieni to rotate in similar diria-tions and :it similaiiiit i' elle two iii t were rigidly i slush..

loaf.' mounted on the huh een, h ratehet-x`vlwel 532t the but tour teeth in its periphery, ing equally spaced at intervals of (ingrese.v as niore clearly .shown in dist'. .tti further has two stops eutI in its periphery, one, 23, being adapted se to he engaged bythe lng 2li on the. haelt of the switch hook Q5, eno. the othen 26, 'being adapted to he eugugd 1ey the tooth of the 9i". Y= shaft iii, when turned in the direction ,indicated hy the sri-ow, in Fig. 1, tends ratchet in 30.

rampes he turned by a clockwise rotation of the' shaft 12 hy the handle 13.` Such a rotation ot the disk will cause a similar rotation oi the disk 16. The disk Q0 Carries another pin whose office it is Awhen in normal position. shown in Fig. 2, to engage the flat spring 3l in the pawl 35, keepin' the tooth of the latter out ot' engagement with the disk frli, although this pawl would other- .Wise he drawn into such engagement hy the sprinp; o, that is, the pawl Willengage the disk Si. preventing a clockwise motion from normal position, unless the pin 33 holds the pawl out of sneh engagement.

The dist: 30 is a ratchet Wheel having about s quadrant of its periphery eutwith teeth adapted te he engaged by the pawl 37. By rotation ot' the shaft 19 successive teeth are engaged hy the pawl 37', which is normally in engagement with. the iirst tooth. 'But the handle 13 cannot be turned haekward until' it has heen turned far enoughl for the paWl or to pass all the teeth which are ont and ride upon the uncut periphery ot the disk 30, for the following reason: As the outer line of the teeth-in this ratchet portion is in circumference of less diameter than the full: diameter of the disk 30, the pawl 3'( when on the full periphery will he thrown out. farther than in passing over the top ot any single tooth At such a time, therefore. the pin B8 in the end of an arm of the paw] 3'? will he engaged by a Shoulder en theend of the pawl 39. Parvis 37 and 139 are drawn toward each other by the spring et() and when the engagement he tween thorn neer-.rs at the pin 38, the tooth ot l? n'ili he held ont of the ratchet in the disk 30, so that if otherwise permitted this disk and the shaft. l2 may return in an antieloekwise direction to normal position; out in so returning5 the pin y4H, carried hy the disk 30. will engage the end of the "Liawi 3S)H tripping its other and from the pin 38 and so allowing the pawl 37 to fail again into engagement with the first tooth of the It will thus be seen that while it is not possible to turn the handle "13 backward from any position in au ineom 'certfied' the gear 42. This gear carries the pawl 43, adapted to engage eitherl of the four tecti in the periphery of the disk The gear if.) is provided with a sleeve 44, which serres the double purpose otl a hub eoin'fentrie with the post 18 and of an axis for the sleeve Q1, which joins the disks 16 and EL). v`illhen, therefore, the clockwise turning ot' the shaft 12 occurs, the described construction causes the disk QQ to turn. The relation of parts is such that when the handle 13 has turned the shaft 12 through the full anglo provided vfor it, the disk Q2 has turned a quarter revolution and the pawl 43 has engaged the next succeediiner tooth. As the spring is now wound up h v a quarter turn ot' the dist: 1G, it is exerting force tending; to tarn the' lini-a ,clockwise direction, iie'wegl in Figz. But the spring 15 thus wound may not run down at once. The ,2jaar at?! engages the spur 45, which is carried on the saine shaft 4G as thegear 47, the spur 15, shaft,- Ltti and gear 47 being unit-1d together rigidly. The latter meshes with the worm 4S, whose shaft carries on one end the ecfapeinent 111-.

e elwtroinagnet 49 has an armature 50, the extreme end ot which is so related to tht` eseinwnien: 't4 that when the end of the armature opposite the magnet poles is drawn toward and released 'from them the esf'apenirnt Vwill be allowed to advance step if; step. illternat'e teeth ot the esca-pement are hent in oin'iovsite directions. As shown :in itin' 2 and il, any tooth which is bent the worm tel will be engaged h V the ltffli. armature when it is attracted by the mag,- net lt); eimrersely, any tooth which is bent away trom the worm will be engaged by the armature when it is not attracted by the magnet it). 'l`o cause a flow ot current, therefor. through the magnet 4:9, alternately attracting and releasing' the arma- `tura 5t), will permit. the worm Vft-S to rotate and thus permit the ruiming,` down of the spring in an amount Igoverned by the number -ot .imgulses through the magnet 49 and with a correspontfling delinite rotation of tue shaft all. and others in the train shaft t5 extends through the hase l1 to the trent, reaching' also coml\/ through the insulating;l disk 51. extreme end oi the shaft. ttt carries the ariu hut is instituted lroin it. The arm 52 is provided with the brushes and fri. The tormer is adapted to engage any one Ot' a @plurality4 of conductingl pins or studs 55, mounted. in the insulatingy dislt J1, on a circumference ijiavinn; the axis ot the shat't 46 as a center. These conducting,` pins are shown in 1 5 and 9, and in the latter ligure are shown as open circles it used conducting terminals for wires, or as solid circles it ther serve merely the purpose of "ist hating stops upon which the brush 53 may rest between contacts with adjacent wire-connected points. The brush is held outward against these pins by the retractile action ot the spring 5G and the brush 54 rests upon the ring` 5T, which, as shown in Fig. t), forms a terminal t'or a conductor ot' the circuits. rthis conductor is thus ronstantl)7 extended to the tip ot' the brush 5B and no lectrieal connection exists between the arm S2-and the shaft l1G which .carries it, as an insulating;` bushing', 58, in

Fig'. 2, to he engaged by the/lug Q4 on the back ofthe switch hook lt', then, the telephone receiver which this hook is adapted to carry shall noty be on that hook, the lug` 24 will engage the slot 23, preventing the disk 1G .t'rom rotating to wind up the spring' l5. l t is therefore ii'npossihle tor a patron to turn the handle y13 to institute a call. unless the receiver hook 25 he down. lt`i11'tlieiii'ioi'e, it impossible to turn the handle after it has once been turned con pletel)Y to the right and allowed to return, because the pawl new engages the disk 3l, due to the absence of pressure of the pin 321 against the spring When the disk 30 is in its normal position, before a call is instituted, the pawl G0 engages a tooth in its periphery. This tooth is distinct from that series forming the ratchet or the pawl 37, and permits the pawl titl, when engaged. by it, to keep its rear arm out. of engagement with the pin (31, which projects irom the under side ot' the aruiature 50. TVhen the disk 30 is tirst. turned in calling, thcpawl tj() is lifted, and so by the )pin G1, the armature pressed toward its pole pieces, being so placed in a position similar to thaty into which it would be attracted it the magnet 4D were encrgized. During the Atall operating;y position of the disk 30, therefore, the aruiati'ire 50I will he held as it' attracted by its magnets and may only be released to recede from its magnets when the pawl Gt) again drops into its normal piace when thehandle 13 has gone hack to normalpositon. .seen therefore that in instituting a-call the turning of the handle 13 clockwise and its return anti-elockivise to the normal position will Ljive the armature 50 a. stroke, releasing the eseapement 14 by two teeth to advance the brush 53 from the normal Contact pin 55, with a resulting effect on the circuits. It is at the step of the second tooth 1t will be 4; Lompoc that pin is abandoned by the brush 53. It will also be seen that duringa a movement of the handle 13 in instituting' a call no impulses iii the magnet i9 could move the arm 50 to release` the escapeinent lll, esit is mechalzally held by the pawl 60 from any receding ntion from the magnet..

The' gear el? carries concentric with itsclt a disk GS?, which has one notch in its ps riphery adapted to be engaged by s pin 63 on the under side of the pawl 27. The pawl 27 is lifted out of the notch Q6 in 'the disk 16 when a call is instituted. it the saine time the pin 63 is lifted out of the single notch in the disk (S2. As tho-gear 477 and the dish. 1G `both revolve, though in opposite dirsotions, when the. train is beingl Iun down, and asthis gear :and dish are in the same train, the parts olf the paal .27 only return to engagement` as described when the train returns to the condition shown in Fig. 2. The. disk G2 is motionless dni-ing the preliminary turningr of the disli lll to Wind up the spring` l5. and the pin 63 is lifted out of the notch `of disk (32 by the action of the en gagging' inclined surfaces ol notch 26 and pawl 27, but when the trein vis running down, or returning to the condition shown in F the gradual return of pawl 3i' to itsnormal position (hy the sliding of the inclined surfaces ol Q6 and 27) is provented by the engagement ot the 'pin G3 with the periphery o'l' the disk G2, whereby the re- Aturn ot' the paul 27 is delayed until the disk (32 and rQ'ear i7 have returned fully to 'their normal l ositions when by assine 7 b under the piu lill ot' the abrupt shoulder of the notch of disk (32 the pawl I? is permit-- teil to return quickly into the notch 2G. Wlien the pawl 2' is being carried on the periphery of either disk lll or (l2, its insulat ing point (il forces together the two Contact springs (55 and (5G. while 1n the normal p0- sition otl the pawl 3T these springs are out ot' contact with each other.

The disk 3i) carries a conducting piece G7, but is insulated 'from it. This conductingl piece has no other electrical otioe than to nialce contact iu the normal position of the disk 2l() between the sp1- ings 58 and 39.

' lhe switch hook 25 aetuatos springs 70,7l,

72,78 and 74'. these being;` assembled so that certain contacts are made when the hook 25 is down and certain others are, made when it is up. 'lho exact relation of the' contacts made and broken can be, best seen in Fig. E), in which the parts are conventionalized and in which the spring 7l oscillators between the parts 7U' and 72, while the spring 73 is adapted only to make Contact with the piece 74 when the receiver ison'tbe hook, In Fig. 9, springs 71 are shown as' a single spring, whieht'hey really are, considered electrically, though they may conveniently be two in mechanical form.

The armature 50 carries a spring 75, so formed at its free end that the pin 7G. oorm ried by the switch hook 25, Wili pass freely by' this formed end While passing upward. but will engage, in passing downward, with the result that the armature 50 on. suoli downward motion of the hooi( switch will be thrown towsi'd its magnet poles ss it' it Were attracted by them. The relation oli the springs 75 and the pin T6 may best be by comparing Figs. 2 and 7. This move nientot the armature 5G 'will release o tooth mC the. oscapement Wheel M, thus permitting a linal step to the brush 53 to return it to its normal. position upon banging up the re-.n

eoii'er after conversation. Further new in Fig. th 'certain of the pins, suoli as and others in that circlej will be, seen to be connected to contacts in the tour series ot switch points, each series bovino; a iodio arm. The four radial arms associated with these series switch points are connected to .each other and to ground or to a ooi'oinon,

return wire. Each arm is adapted to set, to Contact with either of the ten pins rin its series and thus to ground the conductor loading from that pin to a. `pin on the disk 5l or dial, as it may be called. Nine points in each of the tour series are provided with.

such wires. but the tenth pointhss no Wire d connection whatever. These. 'four series of Contact points with their levers forni the oievice to which have previously referred herein as an indicator. It will be seen' that the lett hand indicator lever in Fig. 9 rests upon its first or upper point and that .bis is connected to si pin on the dini. The see,- ond Contact of the letthond indicutor lever is connected to the conducting the dial which stands next to the right. Successive indicator pins associated with that lever are connected to successive conducting pins in what may be callod the first quod rant of the dial, and similarly the second.4 third and fonrth quadrants, counting; clockwise, belong respectively to the second., third and fourth indicator lovers, counting from the left. it is the province. therefore., of each indicator .loyer to ground one and only one of the conducting loins in its quadrant of the dial, :uid in practical use the 'posh tions of the indicator levers are indicated by some digit, 0 to 9., any sach digit except 9 indicating a position in whim one of the pins of the quadrant belonging to that lever is grounded. lt the lover be upon the tenth or last pin. of the indicator no pin in its diehquadrant will be grounded.

The central ollice apparatus is so designed as to cooperate with the substation signal transmitter as follows: Current impulses are sontl from the central otlico over line l' to ground, successively energizing and deonergizing electro-magnet 49, thus permitting brush 53 to step around and successively.

lilo

connect with the points in its circle in proper synchronisin with selective stepping devices in the central otlice, the selective stepping devices al the central ollice being further controlled by `ground circuits encountered upon L1. Thus vwhen in the condition slm fu in Fig. t), the arni revolves in response to control ot electro-magnet iff. the ln'ush 53 ceines into electrical connection with the fifth point when the central otlice stepping apparatus is in a position corrtwptnuling to 0" thousands. since the digit arni 'l`h" is set upon t) thousands'. in similar inanner the position o't` the digit arms Il, T, U are signaled to the ccntral otlice through the occurreiuze ot grounds upon L1 in the travel of the brush 53 as controlled by impulses troni the central ottice over L2. Such control is taken Yfor the tour quadrants independently to provide for the four digits. l separate stepping device at the central otlice pertains to each digit 'and individually controlled by the brush 557 when in the corresponding t'uiadrant. This central otlice stepping device is controlled by a series ot impulses associated with the impulses which step the brush 52 forward, the central otlice stepping device being stopped when a ground is encountered upon lj. Forthc selection of digit 0 on anyY digit arm, the ground placed upon the tirst conducting pin of the quadrant; to select digit 9 on anyY digit arm, no ground is used, the central othce stepping device not being stopped by a ground upon L1, such stoppage being unnecessary as the stepping de rice provided with ten steps and 'for the selection ot this digit 0f the stepping device passes to its last possible position. .As the ground on L is required only for those digits in which the central ottico stepping' device rciliuircs to bc stopped betorc its extreme position is reached, it Jfollows that at tintes the grounds cncrmntercd by the brush i'niay be Atower than iour. and in the case ot' selection olf the number 09H5). no ground whatever would be encountered by the brush Bil.

As the province ot the indicator is to Iset up the digits ot the called lincs number, and that ot' the dial to,havc one pin in cach quadrant grounded tor control ot'thc centrat ottico machines, it will be seen that.l with the exact construction described the pat-ron may call any number from 0000 to 099), or a total possible maximum of i000() diil'crcnt. numbers.

By providing' five levers in the indicator,

and tive series ot pins in the dial. any noniber to 90990 can be called, a total ot 100Mo() ditterent numbers. lu like manner any greater or less number ot indicator levers and series ot dial pins may be provided.

ln Fig. 9 there are shown `tour indicator levers, respectively marked Th. H. T. and U, signifying that. a given. lever shall be used to indicate 'the digit standing in thousands, hundreds, tens or units place in the called number. The digits 0 to 9 adjacent to the points ot each indicator are designate the particularity of the digit in each such period. The lever positions shown in Fig. 9 are such as to call the number 236.

The pin 55 of the dial is 'tor convenience and certainty made somewhat wider of eon tact surface than are, the remaining pins.

This is connected electrically to the pin adjacent to and adjoiningon the right the pin 55a. This isinturn connected to ground.

The switch hook Q5 being down and a call having been instituted by Winding up the train as described, the return of the handle i8 to normal position steps the brush 53 from the pin 55a to the adjacent one through the described motion of the armature 50.

.ln this condition the circuit may be tracedtacts between 68 and 69 as well as Gir and 66,

respectively are closed in this condition ot' parts. The successive impulses so received by the magnet 49 advance the arm'li)J by` successive steps, the first impulse causing itJ to step ott ot the grounded pin adjacent to In passing through the first quadrant the brush engages a, grounded pin unless the, left hand indicator is for the digit D. ot her quadrant, as'controlled by the position ot' the correspoi'uling; indicator lever. T he proper stoppage of central ottico circuitst ilectingr switches will be effect-ed by impulses over wire L1 when these grounds occur, or no stoppage will be effected if the digit be S), and by successive impulses the brush 5? ultin'lately will rest on the contact 55". in that position of the train, the hook switch Q5 can rise it the receiver be ri inoicd. although the pawl 27 will not yet have fallen to break contact between springst and (t. Upon the lifting of the lever 25, the making ot contact o'lE 7lwith70and the breaking of 7f3 'fromTLlestablish an ungrounded talking circuit vfrom L1 to L2 through the receiver S2 and transmitter 83 or through any other arrangement. of telephone ii'istrumcnts'which may be pre'lmred. The resistant-,e 84, whichis high relative to other parts of the circuits of the system, will be included in series with the line and telephone circuit it the spring S5 and contact 86 be separated byv pressure on the button 87. During conversation this button The same will be true for each,

ti t) through 111, 112, 109, 95, 9G, 110, 113, 114, 103, and to eartlnenergizing 103 and causing the brushes 10G-107 to step pt'Qrwarcl one Step into connection with contacts NJW-105 respectively, which are the Cuntaets correspuniling to the O-thousand granp or subscribers lines. Next, brushes 93-94 eonnect euntaets ll-lit and brushes 97- 98 `Siinultaneously eonneet contacts 11T-- 11S: the former pair ol" brushes close a eireui'u from positive terminal of battery to L2 and thenee through T3, il., T9, Lit), ete., t0 earth, Causing hrnsh 53 to make a Step anti to pass into eontaet with the fifth pin, "'viiieh is eonneeterl to earth at' the substation; by this movement ot the brush 53 a circuit: is elosefl from the. positive terminal of battery through the relay helix lill to N., 71.72, TS, 5T. 54, 52, fifth pin, thence, to the first or No. t) i point ol the thousands tlig'it indieator, :unl inaunlueh as the thnusands digit arm in Figi'. t", is Set upon that point, the eirruit is ronipletetl to earth at the, snhistation thul enelgi'/ii-ri,Y the rela)v helix lit) and attraetinj ;l the armature lll: hy the altrartion ot' the armature lll` the eirenit is elosetl from positive pole ol" hatler)y through lli. lill. 11S, UH. 9T, 11T` h2, 12?, relay helix l2() to negativ(- pole ol' battery` whieh eireuit ia a lla-king' wirt-uit to maintain the relay armature lll irulepeiulently ol.I the eontinnanee ol' the suhstatilni rontavt ol' brush ily thi lurking' oll the armature lll. the 'olullnlor IIL' is isolatell troni the haltery terminal antl l'urther elnsinn ol' the rireuit ahore hwrrilwll as energizing magnet 101i is imposable. ln tlu` runtinuanee olI the motion-ol liu` brushes. the hrusheh 9:5- ll; reperiti-ily energize alul ileinergi'lze man1 nel lf.) :unl thul yatep the hru h fr?) orer the lil-.at quzulrant ol' the signal transmitter` while hruslaw tt- JS hohl elosml the loi-lling eireuil ol' the relay whaling' lill. .\s the hrushe l"a\i the tirenrv-lirst rontaet ol' their respeetire row the inviting' rirruit nll the rela \y helix l l) is hrolien: the hrush 523 at this tiuu hay pauw-ll heronrl the liist pnulrant oly the -igual transmitter anll is entering the .wl-mul (plallrant. H lalore. tlu` hruslul DI; .ll senti eurrentinxpulaes over the line lf to propel the l ru h 32S. tluI brushes il@ Uli senil eurrent impulse4 through lll llL aiul thenre through wire ll alul li tu :feine Jfurther leril'e l'or interpreting the'sl-eoml or lnnulrells (h it as ileternlinetl h the setting` ot the. hunllrelis digit arm in Fig. t). s in the ease ot' the thousands digit, impulses will he sent hy brushes J5Y ilt' until brush Il?, eruounter a grounllell pin in the signal transmitter. uhereupon the armature lli will he. attraetefl hy euereixatiun of helix llt) and will h'e retaineil h v energization ol helix llt), thereinr pri-rentingl further impulses Lef@ A and thus determining the Control el' the Cligtant brushes aetine1 to seleet in res ense tn en 1 Y. y. control by rhe h'unureds digit arm 0i; we signal transmitter 1n a manner analogous u brushes 10U-#107 1n remunse lo eontrni n' l the thousanc s digit arm uf the s; i

lnal tra mitter. The thiril anal fourth araulrants of thesignal transmitter are eenrolletl by a. further rleriee Similar to that ntf Fia. and the ligitai signals: 'ire-ni 'the brush :'53 are similarly interpreteti.

It has heen Het. forth that 'he :ugual tranan lnitter of this applieatien is adapted ie' operate with a type nl' automatic "'eiephoi switching' syatein already l! .Quell elsewhere and innlerstomi in the art Le which this present intention pertains. onlyr auch portions of the entire system ingingy uf'fein cliseloed' as are required to illustrate the aneratien of the signal transmitter.

I elai1n-- l. ln a signal trainnnittifr nrtele changea. a spring-driven '1f-train. manual winding' means4 heretor, en netie elfeuwnient iur slai l 5r-ai ,Ice ventral uflit'e, a allai eunirui nf -ing ailg'nlat ueries it rontaets, a hruah driven hy Haiti gearirain and ailapiml sureessively to engage all the eontarta will lial. a llink earrieli by Haiti nu nal unnhag means alu-l haringr a notch in ns elige: nl a hell erunlr lever normally engaging sani link inl its noteh anti nornniily extending' near a nuirahle part of naill eseapeinent. Said hell erank lever heine :ulaptenl te he nuire-:l when lwill manual winfrling` means i5 epe atell anll then to he held by the elige of anni llislc in sut-h position that it extenriei intoA the path of Saul niorahle part'l of .Quill ein rapenient whereby salti eseapetnentis me rhanieally luf-kerl againat fleetrunagnetie operation hiring the aut ut' winding. L). ln a signal traikisniitter, a lriwn gear-train,` ymanual winding; u therel'or. an eleerrtunainetie rseapement ,er faul geararain, a (liai emnpriuing atijar" t series* ot' contacts, a brush iirireli. by Saul war-train anll adapted sueeeanirely to enragfe all the eontaets et Saiil nia-l, anti n lever pmitionell to engage the nun'ahie-gnirt ot sa'ul manual' winding means aiu'l a mm2 able part o'l.' haiti eseapenient, whereby by the n'mrelnent or' .Call winding means te inatitute a rali. .wahl lerer iS marmi anti anni eseapenunt ir; aetuateil meelninieally to m? ranre Saul hrush troni it.r`l normal parution,

2l. In a signal transmitter tra' antoniatie exehanges, a inain-,apringir and a rear-train tlriren thereby, an electroinafnetie escapenient tor said gear-train, a (irai eonipriaing alljaeent' series nl' eontaets. a hruslh flriren hy laaill `rear-train and allaptell 'to engage the eontaets of `aan! (tial. and manual wind ing means for Saul main-spring Seiloci- A ment for said ing against return to normal position 7when said main-spring is partly ivoiind and self loch-ingl against further winding after return to normal. position and before full operation of said gear-train.

l. .in a signal transmitter for automatic exchanges, a main-spring and a geant-rain driven thereby, an electiomagnetic escapegear-train, a. dial. comprising adjacent series of contacts, a brush. driven by said t,emr-train and adapted to engage the contacts ot said dial, and manual Winding means for said main-spring self-lool;- ingi against return to normal position When said main-spring partly Wound and sellloclfting against further winding after return to normal position. and before full operation of said escapement.

5. ln a signal transmitter for telephone exchanges, a main-spring, a gear-train driven thereby, an electromagnetic escapoment for said gear-train, a circuit for said escapement, a contact dial, a brush adapted successively to engage the contacts thereof,

and manual winding means for said mainspring self-locking against return to normal position when said main-spring is partly Wound and adapted to interrupt said escapement circuit when the Winding means is not in normal position.

6, ln a signal transmitter for `telephone exchanges, a main-spring, a. gear-train driven thereby, an electromagnetic escapemeut for id gear-train, a circuit for said eacapemei a Contact dial, a brush adapted successiv .to engage the contacts thereof, and mar l Winding means :for .mainspring ses l .king against return. to normal position when said main-spring is partly Wound. and adapted to interrupt said escapement circuit when said main-Spring is partly Wound.

i". fi a telephone signal transmitter, a main spring and manual Winding therefor, a gear-train driven by said mainspring, an electromagnetic escapement for said rear-trio. a. circuit for said escapement, and means adapted to open said circuit at the beginning ot' the manual operation ezt said Winding' .means and to hold said circuit open until the return to normal oll said Winding means. y

El. lo a telephone signal transmitter, a main-spring and manual Winding means therefor. gear-train driven by said mainspring, an electromagnetic escapement for said gear-train, a circuit for said escapenient, and Imeans adapted to open said circuit i n.; the, manual Winding of said meinem. and rurther msnm :tor opening l l l i l l l l Losa-,cee

said circuit when said gear train is in its normal. position of disuse.

`wind said main spring, paivls adapted to i obstruct said handle against return to normal position until said main spring has been Wound to a predetermined degree and to obstruct said handle against return to normal position after a Winding to a predetermined degree, and to prevent. the further operation of said handle until said gear-train has returned to normal. position.

l0. In a substation telephone, an electromagnetic eseapement and a gear-train controlled thereby, a gear-train 'when elevated, a contact-dial and a brush therefor, means adapting Said brush successively to close circuits through contacts ot' said dial, one circuit being possible for each digit of a called telephone number, and mechanical means adapted to advance said brush from position of conversation. to normal position when said switchhook is depressed..

switch-hook locking1 said l1. ln a substation telephone, a rotary.

signal transmitting mechanism having a stop position completing circuits for conversation upon a call originating at the substation telephone, and havinganother stop position completing circuits adapted for conversation upon calls terminating at the substation telephone; a switch hook lever forming a part. of the substation telephone;

' and mechanical mutually engaging members upon. said lever and upon the signal transmitting mechanism whereby by the downvfard movement of said lever after conversation the signal transmitting mechanism is advanccdby mechanical control to its position for receiving calls.

l2. .ln a substation telephone, a contact dial and a. brush therefor, a gear train driving' said brush, an escapement z(governing the movement oit 'said gear train and having vibratory member; a hook switch lever; and cooperating members upon said lever and upon the vibratoriT member of said escapemeiit and adapted 'to engage each other by a downward motion of said lever whereby said brush is advanced by a downward movement of said switch lever.

Signed b v me at Piqua, county of Miami,

tatate of Cillo, in the presence, ot' two Wit-1 Gnocca Vanoise, Cima-ans Rosso LAWRENCE.

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