US1173564A - Operator's calling device. - Google Patents

Description

A. H. DYSON. OPERATORS-CALLING DEVICE.

APPLICATION FILED FEB-23.1911.

Patented Feb. 29,1916

4 SHEETS-SHEET I.

A.'H. DYSON] OPERATORS CALLING DEVICE.

APPLICATION FILED FEB. 23. I911. 1,173,564. S Patented Feb. 29, 1916.

4 SHEETS--SHEET 2.

] [En/5x722?! 6 A Jaw-501m I 5 7 wm xg w A. H. DYSON.

OPERATORS CALLNG DEVICE. APPLICATION FILED FEB. 23. 1911.

Patented Feb. 29, 1916. v

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OQOOOOOOOQ 00000000 F 8 .23 W2 mmmmmzar fZY-UEZZTUFI 157F517 A. H. DYSON.

0PERATORS .CALLING DEVICE APPLICATION FILED 3.23.1911.

Patnted Feb. 29, 1916.

4.SHEETSSHEET 4.

UNTTS v TENS HUNDREDS UNITED STATES PATENT, OFFICE.

. ALFRED H. DYSON, or cnrosoo, rumors, ASSIGNOR T KELLOGG swrronnosnn m;

SUPBLY COMPANY, Oll GI-IICAGO, ILLINOIS, A CORPORATION OF ILLIN 01S.

'ornnsron's CALLING DEVICE.

T 0 all whom it may concern Be it known that I, A'Lrnnp H. DYsoN, a citizen of the United States 'of America, residing in Chicago, county of Cook, and State of Illinois, have inventedccrtainnew and useful Improvements in Operators Calling Devices, of which the following is a specification.

My invention has to do with calling devices for directivcly controlling automatic switches and more particularly to operators impulsetransmitters adapted for use in connection with semi-automatic telephone systerns in which automatic switches are controlled by operators for connecting calling and called telephone lines, and is part1cularly applicable to two-wire or metallic line.

- systems in which the automatic switches are jdirectively controlled withoutthe use of a ground connection at the calling device, al though by slight Variations of the impulse.

springs, it may be used for grounded systems. 1 My invention relates to thekey controlled type of calling devices in which the usual finger hold dial or lever is not used but in.

which a single button or key is actuated each series of impulses, the number of keys or buttons. actuated depending upon the number of series of impulses in theset, the object being-to provide such a device which is niore'simple of constructionend of operation.

skilled in the art and which will be more readilyvfollowed.

claims. I J

In the accompanyingdrawings which particularly pointed out in the appended form part of my application, 1 Figure 1,[ which includes Parts 1 and 2, illustrates d1a-- giiammatically a semiautomatic telephone system. Fig. 1 illustrates the. off-normal spring arrangement of hnesW1tch C. 'Fig.

2.'illus trates one, embodiment of my .inven-T tion; Fig. 2 shows arrangement ofimpulse keys before an operator. Fig.3 is ttli'lOdlfi-f cation of the structure illustrated in Fig. 2,

and Fig. 4 is another modi 'ation of Fig. 2.

Referring now more particularly to Fig. 1, by placing Part .Z thereof to the right of Part 1, the operation of the system may be the calling and called lines.

Many features will be apparentto those' The off normal switch q-which 1s shown-111% Specification of Letters Patent. Patented Eel 29 1916 p I Application its February 23; 1911. serial no. 61Q,420.

10 and llterminate'at the cent-ralexchange I in a line switch Cwhich is'a'dapted upon v -eratorwho by means of a calling device,

such as shown in Figs. 2, 3 and 4, operates a first selector Dand connector E to connect The substation circuit arrangement may be of any desired form but I illustrate sub 7 station A which is a well known simple cir- Cllll] arrangement.

v Said sub-station A is connected wlth line switch C by means of line' conductors 10 and 11 which terminate at the contactsof the cut-cit relay C0,. 11d

at the multiple terminals 12, 13 and 14 of connector switches having accessto the lines of sub-station A. i w

' Each line switch C, besides a cut-o'fi relay CO, .also includes a line relay LR,,a motor magnet MM, releaserelay R and off normal springs ON. The wipers 15, 16 and 17'are adapted to cooperate .withfbank contacts 18, 19 and 20 respectively and assuming a basis so i of 10 per cent. trunking which is customary inexchanges of this character, therewould be ten'such sets. of bank contacts 18, 19" and 20 for each line switch C.; The line switch C is of ordinary rotary switch construction,

the wipers 15, 16 and 17, which are mounted upona singleshaft being adapted to be rotatcd by means of motor magnet MM and suitable ratchet and pawl mechanisms, so that the. said wipers 15, 16 and 17 step along from one contact set to the neiit upon each e'hergization and deenergization-of magnet.

MM. In the release of the switch the wipers are; again advanced by mot on nagnet-Ml\ until the engaging set of wipers "15, 16 and 17 have advanced to a point beyond the last contact in the bank. The said bank contacts 18, 19 and 20 are'so disposed that whenla set of wiper arms 15, 1G and 17 have stepped onepoint beyond' the last contact-'inithe row, the next set'of wiper arms are engaging the normal contacts 18,'19-and 20',

ON, a detail of moved to its alternate.

position upon the ,is adapted to -be I -.l05 first off normal step of Wipers 15, 16 and 17,

and uponrestoratio-n Wipers to 1101- mal, the next projection 21ji'estores ofi' normal switch ON to normal; For each one jhu'ndred line switches (Inher nt ten first selectors D, so that each such firstselector would be multiply connected to one hundred line switches C, although I have shown but two such multiple connections.

Each first selector 1) has an associated key switch switch K and calling signal lamp L located at an operators switchboard so that upon selection of an idle selector D upon 5 anitiation of a call, its signal lamp L will be it"! i illustrated but a sin le listeniu key LK it is to he understood that there is one such key for each calling device key K and-that the operators telephone OT is multiply connected to the said keys Lh'. in a 'well known manner.

The selector and connector switches of Fig. l are adapted for operation with the switch of patent to V. Kaisling, 975,530 or any switch of the same general type. Each lirst selector D also includes a primary relay Pll which is adapted to transmit the primary directive impulses, a. secondary relay SR, which starts the initial secondary operation of the wipers in selecting an idle trunk, a busy relay BR, which con trols the selcetionof an idle trunk, a primary magnet PM which controls the pri mary movement of wipers 24, and .26 and a secondary magnet SM which controls the secondary movement of the said wipers 2+. and 20, a main release relay MRR, which controls the release of several of the switches, a release relay RR. a release magnet RM, which releases the wipers ill. 25. 2(, a primary oll' normal switch POX. which is moved to its alternate position upon the first primary step of the wipers and a secondary oll' normal switch SON. which .is adapted to more to its alternate position upon the first secondary step of wipers 24-, 12.3 and 2h. l lach selector switch 1) includes one hundred sets of bank contacts 27, ill", 29 arranged in ten groups of ten contact sets each. lVipers 24, .20 which coiiperatc with said bank contactsli'. and 52D respcclively. are adapted to he moved in a primary direction to select a group of contacts depemling, upon the number of impulsestransmitted from relay PR and are adapted then to he moved in a secondary direction to select a set of contacts '27. 528 and 2%) of the selected group. Upon the release of the switch 1), wipers 24, and 96 are lirst restored irom their. secondary movement [hereby restoring switch SON and are thereafter restored from their primary movement, thereby restoring switch PON. Assuming a basis of ten per cent. trunking, as previously stated, there would be one hundred such first selectors 1), divided into ten groups, there being ten selectors for each group of one hundred lines, and accordingly there would be one hundred connector switches E divided into ten groups of ten switches for each one hundred lines.

The cormcctor switches E are of the same general type as first selectors l) and the magnets and mechanism of connectors E, which have functions corresponding to similar magnets and mechanism of first selector 1), have the same reference characters but with the sullix I Each connector switch also includes a test relay TR for testing the idle or busy condition of a called line, an interrupter or flip flop relay FF, for intermittently connecting ringing current to the terminals of the called line, the ringing control relay RC which is adapted upon response of a called subscriber todisconnect the ringing current, a discharge relay DR which momentarily shortcircuits the called line after each application of ringing current, a circuit closing relay CC. and several other relays whose functions will be more particularly pointed out in the description of the operation of the system. Each connector switch includes one hundred sets of bank contacts 30, 31 and 32 divided into ten groups of ten contact sets each and the wipers 33, ill and 35 are adapted to co operate with the said bank contacts.

Line switch G is similar to that of line switch 0, the corresponding parts having corresponding reference characters with the 'sufiix added in switch (1.

Fig. 2.-Calling derice F of Fig. 2 which is adapted to be connected with selector D by means of conductors E22 andi23, is prefcrahly arranged common to a group of such switches I), preferably ten in number, although this ,Q'IOlllllllg may be arranged to suit existing conditions, or a device may be arranged imlividual to each selector. Assuming there would he one calling device for each ten switches l). therewould be ten keys K. K, etc. and their corresponding signal lamps L. L. etc. arranged helore an operator. For each calling: device F there would he preferably arranged three rows of impulse buttons as illustrated in Fig. 9. each row representing the digits from 1 to 10 and each button being adapted to control the transmitting of, impulses corresponding to its number. as for instance number live in any row when actuated would cause the row .ofsp1'in gs a, 7), etc, and are adapted to j bemoved and locked in their alternate posi-- 43101 upon actuation of any of the'associated springs 11:, 22, etc. 'Key contact springs g and- Q are similarly' common to the middle or tens row of contacts a, f, etc, while key con: tact springs r and u are common to the right -or units row ofsprings is, 111,, etc. Thus assunnng the operator actuates key springs a, spr ngs 71 ands would also be actuated and the three sets of springs a, p and .3 would be locked i-n their-alternate position. The

said Springs a, p, ands are adapted to be restored by the magnet MR, the said mag- ,net' being so arrangedthat the saldsprmgs are restored by thedeenergization thereof tact. The next step of magnet M'advances "impulse wheel 39 so that springs IS again contacts aa, bl), etc, are so disposed that it close, their contacts; Then upon further operation it will be seen that one step of magnet M opens contact springs IS and the next step again closes them, although on the initial operation of the device the said springs IS do not have their contacts opened until the second step of magnet M. The

requires two steps of, magnet MM to ad-- vance wipers 36 from engagement with one contact into engagement with'tlie next, and

wiper36 is so adjusted that it requires so steps of magnetM to. advance it into engagement witlrthefirst contact jj. The common'rmg 40 is engaged by wiper 36 and 'is connected to impulse controlling relay- 'IC by means of conductor 41,;thus wiper The tens row of springs and the units row,

are controlled in a similar manner bv mag-" nets -MR and MR respectively. Key release; magnet KM isadapted, upon opera tion to releeselhe keys K, K, etc.,.-which are-common tocalling device F, the said i erably by grounding the same, :andthezhamagnet ,Kll being preferably adapted to release the keys upon its denergization. lVhile-there would. be. ten such keys K, It? etc, forealling device F, the sa d keys;

wouldghe disposed before the operator with the ing pulse keys (.i, I), etc, and while the said k'eys'K are initially thrown by the operatorathey are restored by the operation of ;magnet KM which is preferably ar-. ranged-"common to the ten keys K, etc. Al-

'ofi any of the lamps, the operator ,Motormagnet M with its-armature and ac tuating'pawl, is adapted upon each oper- 31.10!) of said magnet Mto advance ratchet Wbulds-l-knoW whichfcol'responding key K 36 is adapted to connect relay IC to any one of the contacts aa, 66, etc. The contacts 4 aa, 6?), etc., and relay IC jointly control the number of impulses transmitted by springs 1S, by meansof contacts 42, which are normally inshimt of contact springs IS. Inthe operation of the calling device F if it,is desiredto transmit a single impulse, the potential of contact an is varied, preffore'when magnetM is operated, thereby opening ands-closing impulsesprings IS,

these springs. have no effect upon the methe'second step of magnet M, into' engageactuate thus conhecting her calling do "iii-1C6 Eii iwith the proper-first selector D.

The rotating mechanism ofcalling deviceFincludes wipersB and which are.

mounted on shaft 3?, the ratchet wheel 38 and impukfih'eel 39: being also rigidly securedto thc'same shaft 37, the said wipers being suitably insulate ilr from the said'shaft.

g gwheel v38pm tooth, while the teethof inipulse Wheel 39 are so divided that there are two teeth of ratchet wheel.38 for each tooth of lmpulse wheel 39. Impulse springsIS' rest in engagement withimpulse wheel 39 ;-..wh rch is preferably arranged so thatcit re quires two operations of magnet M to step the outer point of the fi rst tooth of impulse wheel SQ intoengagcment withiim pulse springsj lso as to open their con.

ment with rings'el? anda, and moves out of engagement with the ring at at the same time wiper 36 steps oli'of contact ac;

Con-

tact 45 is adapted to be connected? to the groundedring 43 by means of wiper; 35 for {the purpose of actuating magnets MB- for the release of the actuated buttons at, e, it,

etc. In the key-arrangement a, 6,70, "etc, of

calling device F but four keys of each row are illustrated, the upper keys inarkcd with the figure 1, being adapted totransmit a single impulse from calling deviccF, the

second key from the top marked withthe figure 2, being adaptedto transmit two impulses 'the third key 3,. the fourth key 4,

etc. up to ten impulses, There are ten con-v tacts, an, M, etc., illustrated, but only the first four are connected to keys (1a., bb, cc,- c'tc., and it will be understood that in using ten keys, they would connectto'the' other contacts in regular order. 1n the device as illustrated three rows of keys are sliown, this arrangement being I adapted for a thousand line. system, the calls ranging from. 000 to .999. the row at the left being the lmndreds digits, the middle row being the. tens digits and the righthand row similar to the device of Fig. 2.

the units digits. Thus, if the operator desires to call the line No. 234, she would first press key I), then key g and then key 0, thereby also actuating all of the spring sets 'r, s, t, u. The actuation of the said lftys closesalternate contacts 12, Q, r, thereby causing magnet M to step the shaft 37 three complete revolutions, or one revolution for each series of impulses to be transmitted. Although as soon as magnet M starts the advance or rotation of shaft 37, impulse springs IS are immediately operated by the projections on impulse wheel 39, the opening of the springs IS has no effect upon the metallic circuit including conductors 22 and 23, due to the shunt through contacts 42, until relay IC is energized, due to wiper 36 engaging contact b?) grounded by the operation of the impulse key I).

Upon the first revolution of shaft 37, impulses are transmitted in number according to the key actuated, and in this instance key '6 having been the one actuated in the hundreds row, two impulses are transmitted and shaft 37 continuing in its movement, magnet MR ,releases the actuated contact springs in the hundreds row, thus connect. ing a ground through normal contact 7), to the actuated key g, thereby grounding con: tact 00.

Upon the next or second revolution of shaft 37, a number of impulses are transmitted by springs IS, depending upon the key in the tens row actuated; in this instance the key 9 being the one actuated. As the shaft 37 completes its second revolution magnet MR is operated to restore the actuated contact springs in the tens row, thereby removing ground from contact 00, due to the restoration of key "9, and connecting ground through normal contact q and con tact of key 0 to contact dd.

Upon the next or thirdu'evolution of shaft 37, the operation of impulse springs IS has no effect upon the metallic circuit including conductors :22 and 23until relay IC is ener' gized responsive to wiper 36 engaging the grounded contact a l], and as shaft 37 advances toward normal magnets MR and KM are op elated, thereby restoring the actuated contact springs in the units row by means of magnet MR and restoring the actuated key In by meansof magnet KM. All of the contact springs 72, r and r having been restored. the motor magnet M remains inert, thus allowing shaft 37 to remain at normal until another set of impulses is to be transmitted.

l v'gflr l he calling device G of Fig. 3 is controlled by means of its keys in. Z), etc, The parts having similar functions in the two devices F and (i have similar reference characters but using a different suflix in the case of calling device G. In calling device G the release magnets MR etc., are controlled 'will assume leads to a busy first selector 1) through Wiper 36 instead of through Wiper 3.) as was the case in calling device F.

Fig. J;.The calling device H which is a modification of the calling device F, has the keys (1- 5 etc., arranged similar to Fig. 2 and are operated in a silnilar manner to the keys of calling device F. In the calling de .vice F the wipers 35 and 36 make one complete revolution for each digit or series of impulses, thus making three complete revolutions for three series, or a complete set of impulses, while in the calling device H the wipers 35 and 36 move from one normal position NP to the succeeding position NP for each series of impulses, and for one complete set of three series of impulses said Wipers 35 and move from one normal lution passing over the three divisions The release magnets MR, etc., and key magnet KM", arev controlled over contacts -15, and 45 from grounded wiper The im' pulse wheel 39 is also carried by shaft 3?. thus moving along with wipers 353 and 30 and operating impulse springs IS. in calling device H, two ope 'ations of magnet M are also necessary to step the wipers from one contact to the next similar to F and G, the projections 011 impulse wheel 39 also requiring two actuations of magnet M to operate springs IS a single time. Parts of calling device H having functions similar to parts of calling device F have similar reference characters but with a different suffix.

0peratz'on of system including Fig. 5?.- Having described in general the location and arrangement of apparatus of the system embodying my invention I will now describe the operation thereof. Assuming a calling subscriber at sub-station A desires to connect .with sub-station B, whose number we will assume is 123, the subscriber at sub-station A removes his receiver from its switch hook, thereby establishing a. circuit forline relay LR traced from ground at nor mal contact 50, line conductor 11, upper switch hook contact, through transmitter of substation A, returning over line con- 'ductorlO, normal contact filQnmrmal con- \vincllng of relay LR to'battery,

tact 5Q, energizing said relay LR and closing a circuit for motor magnet MM from ground through alternate contact the winding of magnet MM to alternating current gencrater.

Motor magnet MM is-thereupon energized stepping wipers 15, 16 and 17 into engagement with the first set of contacts 18, 19 and 20 respectively, which we Therefore there would be a ground or busy condition upon private contact 18, thus es tablishing a. locking circuit for relay LR through contact normal, a circuit for relay R is established from ground at normal contact 50, line conductors 11 and IQ, normal contact 51,

54. Upon the first step 01f alternate contact of switch ON which-is now in its alternate position, and thewinding of said .relay Rto battery, energizing"- relay R. Relay LRI remaining energized over the locking circuit 111st mentioned,

" magnet MM advances Wipers 15, 16 and 17; another step into engagement with the next set of contacts l8; l9 and which we will assume are the contacts leading to first, selector switch D which is in an idle condition as illustrated. Said switch being idle there would be no ground upon its, private contact 18 and relay LR would deiinergize, opening. the circuit for magnet MM and preventing any further advance of wipers;

. 15, 16 and 17. Also upon deenergizationoi relay LR a circuit for cutofi relay CO established from ground ,through alternate contact 56, alternate contact 57, thewinding 20 of relay CO to battery at normal contact 58, energiz ng relay CO and thereby connecting T the line of sub-station A to first selector D.

Although the relay R has its energizing circuit interrupted upon the energization of;

3b selector "D as will be described relay CO, said relay R being a slow acting relay, does not retract its armature imi mediatelybut maintains its armature until a locking circuit is established from first" The relay CO having connected the calling line with thefirst' selector D, a circuit, for primary relay PR is established from ground through the left-hand winding of relay PR, normal contact 59, contact 19, wiper 16, alternate contact 50, line conductor l1, substation A, lineconductor 10, alternate contact 51,- wiper 17, contact 20, normal contact and the right hand winding of relay PR to battery, energizing relay- PR -and closing a circuit through main release relay MRR from ground through alternat'e contact 61', and the winding of relay MRR to battery. Relay MRR thereupon energizes, closing alternate contact 62, thereby establishing, a locking circuit for r. v R of line switch C.

.Also, upon energization of relay PRa circuit for signal lamp L i t bli q from ground through normal contact alternate contact 64, the said lamp L to battery, lighting the saidlamp and thereby notifying the .operator'that calling sub- 1 scriber has connected with the first selector 1 D associated with keyK. X," f The operator in response to theisaid sig nal throws listening kevLK, connecting the operators telephone OTwitl1 the calling substation. The operator now ascertains' the wants of thecalling subscriber and finding that the calling subscriber desires connection with the su'b-station'B, which We will. assume is No.123, the operator restores k ev LK thereby disconnecting the telepho e OT and then throws key K, thereby ,closim alternate contacts wand 60, removing the is closed responsive to the actuation of said upon 0 e ated rotating'shaft 37 and upon PR has been interrupted& single time there- 35 engiages contact e5, closing a fcir'cult m' f'substation controlof relay PR substituting a circuit for said relay PR includingconductors' 22, 23 and impulse springs 18 of calling device F.

We have'assumed that the number of the called substation is 123 and therefore toopcrate the switches toconnect the two subscribers for conversation a set of three series of impulses are to be transmitted, the first series being one impulse,-the' second two im' pulses and the third three impulses, and therefore the operator now 'actuates keys. a,'f and a, locking the said keys in their actuated position and thereby also moving springs p, 9,1", .9, t u, to" their alternate position. The actuation of key a connects ground to contact ca and although the keys fand a have. been actuated the contact springs 39 and gbeing in their alternate position, the said keys f and n do not connect ground to contacts 00 and bbuntil the contact springs 12 and'q are restored to normal intheir regular order,- aslwill bemore fully described. 1' A circuit .forimotor magnet M keys, traced from ground,througheach of the alternate contact-s 23g, and r, through the winding of said magnet M to alternating current generator. Magnet M is therethesecond step-of magnet M, wiper 35 is I moved into engagement with rings 1&3, 4A

but without any efiectl ponthe apparatus, wiper 36 is moved into engagement with c'ontact 9'9 and the upper spr ng IS rests on the outer poin't of the first projection of impulse wheel-39,1) thecontact &2 of relay IC being closed, the opening/of the contact IS has no effect upon relay PR." Motor magnet, M'- x continues in ite operation until wiper 36 engages contact ac, closing an energizing circuit for relayIC- from ground'through actuated keycontactv a, contact an, wiper 36 ring 40, conductor 41 and the winding 0% relay IO to vbattery, energizing said relay- IC, opening contact 42 and as the springs IS are open at this time due to upper' "ring TS resting on-th e tip'of projection the circuit for relay ,PR is interrupted allow ing the said relay to" deenergize, but upon the' next step of motor 'magnet- M, contact springs IS are closed again thereby closing an energizing circuitthrough relay PR. Thus it will be seen that the circuit of relay by transmitting "a single impulse as will be more fully described. Motor magnet M con tinues the advance of shaft 3.7, until wiper throng release magnet MR traced from grounded ring 43, wiper 35, contact 4 5, altern'ate contact 8, winding of release magnet MR to-battery, energizing the saidmagnet MR which remains energized until wiper 35 steps oil of contact 45 to its normal po ition,

thereby allowing magnet MR to denergize, restoring key a and contact springs p and s.

From the foregoing description it will be seen that the operator having pressed key a in the hundreds row, the magnet M has rotated the shaft 37 one complete revolution and although the springs IS were opened and closed ten times, the circuit of relay PR was interrupted only a' single time, due to the fact that relay IC-ma'intained a shunt about springs IS until wiper 36 reached contact an. a

Referring now to first selector D, relay PR having been cleene gized and again energized a single time, upon its said deeinergt zation a circuit for magnet PM and second ary relay SE was establishedfrom ground through normal contact 61, alternate contact (55, normal contact 66, to point 67, there dividing and including the windings of magnet PM and secondary relay SR, energizlng both magnet PM and relay SR. Responsive to energization of relay SR a circuit for relay BB is established from ground through alternate contact 68, winding of relay BR to battery, which is thereupon energized, establishing a locking circuit for V itself through alternate contact' (39, normal contact 70 to ground at alternate contact 71. Responsive to the single impulse of current through magnet PM, wipers 24, 25 and 526 are advanced one step to select the first group of contacts 27, '28 and 29, and after the cessation of said impulse, relay SR,

which is a slow relay, dee'nergizes, closing a circuit through secondary magnet SM from ground to normal contact 68. alternate contact 72, winding of magnet SM to alternating current generator. Magnet SM thereupon advances wipers 24, 25 and 26 into engagement with the first set of contacts 27, 28 and 29, and assuming these contacts lead to a busy connector switch E, the first private contact27 will be grounded and a locking circuit for relay BR will be established from the said ground, to wiper 24, alternate contact 69, thereby maintaining relay BR energized from this now looking circuit, as switch SON having moved to its alternate position upon the, first secondary step of the wipers, the initial locking circuit for relay BR was opened at normal contact 70. The relay BR having been maintained energized, magnet SM advances wipers 24, 25 and 26 into engagement with the next set of contacts, and assuming these contacts also lead to a. busy connector switch E, relay BB is maintained energized and magnet SM continues to advance the wipers until they connect with a set of contacts leading to an idle connector switch E which has an ungroundcd private contact 27, thus interrupting the circuit for relay BR allowing the said rclay to dci ncrsrize and interrupt the circuit for magnet SM, thereby pro- T5 and also closing contact 76 and connecting ground to wiper 24, thus maintaining the private contacts 27 leading to connector switch E grounded, and preventing any other first selector from connecting there With.

Although upon de'energization of relay PR the circuit through relay MRR is inter rupted for a short period, said relay being a slow relay does not retract its armature.

The lampL which was lighted at the time switch D was selected, had its circuit interrupted pen the first primary step of wipers 24, 5 and 26, due to the opening of contact 63 of switch PON, and the said sigml is efi'aced.

Referring now to connector switch E, upon the connection of ground to private contact 27, relay 77 of switch 15 is energized, the circuit being traced from the said ground through normal contact 78 and the Winding of relay 77 to battery, but this has no ciiect at this time. i

From the foregoing description it wilhbe seen that the wipers of the calling device have made one revolution, thereby trans mitting a single impulse, responsive to which the first selector D selected an idle connector switch E in the first group of ten trunks. As the impulse springs IS close after leaving projection P, the wiper 3( ,is one-half of a step to the right of contact mt and therefore the next series of impulses are not transmitted until after. wiper 36 is.

stepped around to its normal position. Thus while the wiper 36 is stepping from one tooth beyond contact (m over the dead contacts to its normal position. the slow or secondary relay SR of first selector D has time to delinergize and allow selector D to select an idle trunk, before the next series of impulses is transmitted. This distance from contact (Ht to the normal position of wiper d6 may be varied according" to the time reiilllllflhffil theswitches to perform their function after the last directive impulse has been transmitted and before the calling device is in position to transmit another series of impulses. in othcrwomls this space is simply to allow the selector switchtime to select an idle trunk before the next set of impulses are to be transmitted.

Returning now to calling device F, the shaft 9? having made one complete revolution as described. magnctM continues to rotate the shaft 37 due to the ground connection from alternate contact r it being remembered that the operator has actuated key f in the tens row, and therefore magnet M continues to rotate shaft 37, until wiper.

36- engages contact bb which is grounded through key f. At this time the upper -.spring IS is resting upon the tip of projection 'PP thereby interrupting the contact with thewfello w spring. As the wiper 36 engages contact 66 a circuitcfor relay 'IC is established from ground, through normal contact vp, alternate contact 7, contact bb, vwiper 36, ring ,40, conductor al'and the winding of relay IO to battery, energizing the said relay which-establishes a locking circuit for itself through contact 7 9, ring 44 and wiper 35 to groundedring .43. Thus,

the contact 42 of relay 1C being opened the, shunt about springsIS is removed and mag-c net M continuingtoadvance or rotate shaft 37, the springs IS are again closed and are once more operated by projection P, thereby interrupting the circuit of-rela'y PR v times through impulse springs IS. As the projection- P leaves impulse springs IS, allowingthem to close after the last inter-' v ruption, wiper moves ofi of ring l/l, thus interrupting the lockingcircuit for relay IO which denergi-zes, restoring the said shunt circuit about the said impulse springs 15S. -It will be seen that inthissecond rotation of the shaft 37, that. the last interruption of springsIS iseflectedas wiper 36 leaves the contact rm and no. more impulses may be transmitted until the wiper 36 reaches normal and starts its next revolution. 1 p

Referring now {to the relayt PR, its circuit having been interruptedgtwo times at impulse springs IS as des'crib lay SR :Which maintains its armature in an attracted positionuntil the last impulse of the series has been transmitted. g Responsive to the two said impulses of current primary magnet PM advances wipers 33, 34 'and'35 to th second group of contacts, the said grou including thecontacts 30, 31 and 32 which are the terminals of the called substation B. After the last impulse relay SB? denergizes, closingacircuit for switching relay SW from ground through alternate contact'EON which is now closed, normal contact-82, winding of relayfSW, normal contact 83, tobatte'ry at alternate contact 8 1,energizing relay SWVv which establishes a locking circuit for itself through alternate contact and by means'of vcontact-'86 disconnecting battery] from magnet PM and two I ed, two inif pulses of current are transmitted to relay connecting said vbattery to theisecondary fl magnet SM". p v

' Returning now to the calling device F, which has made two revolutions, upon the next revolution of shaft 37 three impulses are to be transmitted asit will be remembered that ikeya has been actuated in the units row, therefore when the point of pro jection PPP interrupts the'co'nnection bea tween contacts 1S,- wiper 36 vis in engagement with, contact cc, thereby establishing an energizing circuitcfor relay IC, traced from ground through normal contact 9, key contact a, contact 00, wiper"36,' conductor 41.

and the winding of relay 1C to battery, energizing the said relay, removing the shunt about springs lS'and alsoby means of contact 79 establishing a locking circuit through.

ring -4=4,-,wiper 35m grounded ring43 as previously described. Magnet M continues to rotate shaft B'T thereby causing two more interruptions of impulse springs IS by projections PPand'E andaiterthe last ime pulse as wiper35 leaves ring 43,17elay IC is decnergized. From this it will be seen that upon the last revolutioniofifshaft 37, three interruptions of the circuit through relay PR were efiected'andasthe shaft continues;

to rotate toward] normal and upon engagement of wiper 35iwith 'con'tact45, a circuit 9 for release.magnetMR is "established from" grounded ring 43, wiper 35, contact 45, nor

mal contact; 8, normalcontact-t, alternate contact to, then dividing and including the windings of magnets MR and KM to battery. As wiper 35 ste s out ofengagement with contact 45and Intouits normal position, the circuit. through 'the said magnets MR and KM is interrupted and magnet MR denergizing, restores key nand springs 1 and u to norm ah' The restoration of ,con- I tact spring r'zinterrupts the circuit through motor magnet M thereby preventing any further actuation thereof. Upon restoration a of magnet KM\key. springs K are restored thereby disconnecting calling, deviceF from firstbetectfoi D and again including relay PR in circi'iit with the line otthecalling sub--x station, and calling device' F is- -no\v available for further use 1 in establishing other connect io ns Referring againfto the connector E of Fig.1 the efltect'of thelast three impulses contact/61 of relay PR, magnetSM' 'and from primary relay PR will now be describedf'Respons ve to the said threeim pulses of .current'from ground at normal secondary relay-SR ar e energized, the said relay SR,'ma1nta1n ng its armature in an attracted position during the sending of the said impulses and, magnet SM stepping wipers 33, 3d and 85inasecondary direc-.

tion into engagementwith contacts 30, 31

and 32 which are'the terminals of the called a substation till After the last impulse relay SR delinergixes, and assuming the line of the called substatirin B is idle there will be no ground upon private contact 30 and an energizing circuit for relay TR and cutoii relay CO .is established, traced from ground at normal contact 97, alternate contact 88, normal contact 80, the upperwinding of test relay TR, wiper 33, contact 30 and the winding of relay Ct) to battery at normal contact 58', energizing relays TR and CO. The energization of relay CO removes the sub station control. oi line switch C' and upon energization. of test relay TR, a locking circuit for itself is established through contacts tit) and ill) to battery at alternate contact 84, from ground at normal contact 87, alternate contact 88, conductor 01 to contact 90. This same ground connection is extended to contact {12 which is now closed, thereby placing a shunt around the upper, winding of relay TR, and connecting a direct ground to wiper 33 and the multiple contacts 30, thus preventing any other connector switch from establishing connection with the tenni nals of the line ofsubstation B.

Also, responsive to energization of relay TR contacts 90 and 90 are closed, thereby establishing an energizing circuit for relay 80 which attracts its armature, thereby interrupting the circuit through switching ,relay Wil due to the opening of normal contact 8?), and upon the closing of alternate contact 93 of relay TR a circuit for relay FF is through normal'contact 94, alternate con tact 93, the winding of relay FF through interrupter I to ground. thereby causing relay FF to attract and retract its armature in a well known manner. Upon each energization of relay FF ringing current from generator GE is connected to the terminals of the called line to ring the bell of the called substation B, the circuit being traced from the upper terminal of generator GE, alternate contact 95, wiper 34, contact 31, conductor 10, call bell andcondenser of substation B, returning over conductor 11, contact 32, wiper 35, alternate contact 96, to the other pole of generator GE. Also, upon energization of relay FF a circuit for the slow-acting discharge relay DR is closed from ground through alternate contact 97, the winding of relay DR to battery, energizing the said relay and closing alternate contacts 08 and 99. Now upon de'einergizw tion of relay FF, it will be seen that due to the closing of said alternate contacts 98 and 9 the line of substation B will be short cirruitcd, thus causing a discharge of the said line and its bridged condenser of an :u-cuniulatcd static charge from the up plii-ation of ringing current. Ihis dis charge is for the purpose I of preventing a prmuaturc operation of relay It will established from battery be noted that relay DR is a slow actingrelay and therefore maintains its armature momentarily attracted after the interruption of its circuit at contact 97, but upon deencrgization of relay DR relay RC has its windings connected in bridge of the called line. From this it will be seen that generator GE and relay RC are alternately connected in bridged the called line upon each operation of relay FF. Relay FF continues to operate until the called subscriber in response to actuation of his call bell, removes his receiverfrom its switch hook when, upon deenergization of relays FF and DR, a circuitthrough'relay RC is established from 'ground through alternate contact 100, the upper winding of relay RC, normal contact 98,'normal contact 95, wiper 34, contact 31, conductor 10, substation B, returning over conductor 11', contact 32, wiper 35, normal contact 96, normal 'contact 9,9, the lower winding of relay RC, alternate contact 83 to battery at alternate contact 84, thus energizing relay RC and establishing a circuit through circuit closing relay CC from ground through alternate contact 101 and the winding of relay CC to battery. Responsive to operation of relay CO a circuit for relay 102 is established from ground at contact PON', winding of relay 102, to batteryat alternate contact 103, energizing relay 102 which establishes a locking circuit for itself through alternate contact 94 to battery. Upon the opening of normal contact 94 the circuit for relay FF is interrupted, thus rendering said relay inert. Upon the opening of normal contact 87 of relay 102, the initial ground connection to relay TR is removed but relay RC having been energized before relay 102 deenergized, a substitute ground was connected to armature 90, traced from relay RC.

Upon the closing of alternate contacts '80 and 104 of relay CC. the circuit frorri'suhstation A to substation B was completed,

being traced over the heavily marked conductors, talking current for the callingsubground through alternate contact 120 of relay PR is interrupted allowing the said 'R of line switch 0.

relay to denergize, therebyinterruptingithe circuit for main release relay MRR at alternate contact 61 and establishing an energizing circuit for release relayiRR from ground at normal contact 61 normalcontact 65. alternate contact 121, through the wind-" 'ing of relay RR to battery,energizing said relay RR. Returning now to relay MGR, upon its dcenergization the circuit for relay 73-was interrupted due to the opening; of contact 71, allowingsai'd relay 73 todeenergize, opening alternate OO IWRCt-SGGQ 75' and 76, thus clearing wipers iz i', 25 and 26 from any connection to switch D, so that im the release of wipers they ii ill not efiect"; any busy connections to contacts 27, 28 and 29. Although upon deenergization of relay MRR the looking circuitl'for relay R of line switch C is interrupted at contact 62, relay It being a slow acting relay'niaintains its arinature'in anattracted position until relay. c

-RR energizes, thusestablishing a new look. 1

ing'circuit for relay R from ground through alternate contact 122. Also; upon energizetion-of relay RR a circuit for release mag-F net RM is established from groundthrough alternate contact 125 energizing magnet RM"; which withdrawsth'eretainingjpawls hold I ing wipers 24, 25 and 2 i in their adjusted position, and upon \vitlidrawal 'of the said 7 pawls the wipers are restored to normal by tions.

relays having been en/ergized'over a circuit includingothegrourrdfat said contaot"120, and upon the opening of contact '101Qre'lay CC has "its circuitinterrupt d and is re,

stored; Upon restoration iofcaidiela'y a' circuit' for rt case relay ItR' is established n'ate contact 105, winding of relay RR to al e ta roux near a: e

75;, Contact by rr ptin the I w HR is thereupon energized, opening nor:

'f rombattery'at *norinal contact 103, alter-Y Q circuit of relay which deenergizes andy upon the closingof cont'act 106 of relay RR a circuit for releas'e magnet;.Rl\[ is establishedfenergizing the said magnet which withdraws the retaining p'awls for Wipers El ii'andf35,-cai ising the restoration of switch E. "i Upon restoration of the wipers 34 and"35,- switch PON is restored, in terrupting, the circuit for' relays RR and 102,lall0wing thesaid relays torrest'ore, and

(upon restorationof relay RR" release magnet RM has its "energizing circuit interubte'd at contact 106 and ",it is restored"? I Switch Hand theline ofsub-station Bjhay-- iugbeen'restor'ed to'nornialaare available, for

further f use 1 UaZlecZlih husyr Assumingnow that the" calleddineis busytthere willbe a ground i a hing/other connec-f i or busyj connection upon private contactBO,

leading thereto, and upon restoration of secondary relay Sltfafter the transmission of spring tension. The restoration of said ftlielast impulse, therewill be no energizing wipers first causes the restoration of switch j SUN and then the restoratlon of switch PON I to normal. 'Tlie'restoratlon of switch, PON

cuit of release magnet RM andrelease relay Releaserelay R thereupon defenergizes in- ,terrupting the circuit for cutofi relay CO 7 which retracts its arniature,"and also upon rleiinergization of relay R a circuit tor'niotorf; magnet MM is established from ground? through alternate contact 56., normal contact 57,nor1nal contact 53 and the winding of vinagrnet'hihl to alternating current'genera tor, thereby operating magnet MM WlllClL for use in' establishing other connections, *lishing"the connection; @The release of first selectorD and line switch C is accompl shed I 111 as before, descr bed ,and upon, denergization TR, 89 and C0 are restored all of al circuit for the upperwinding of test relay TR due tothe direct ground uPonprivate subs'cribeuj traced [from busy bac in contactBOandthe ground connection to. the i V interrupts the cirouitior relay RR which jotheriterminals Ioithe upper winding of" retracts its armature, interrupting the an 40 said. relay TR ovathe before traced path 1" i I from normal co'ntaot"87. Thus relaysfllld" and S9 fail to energize in thiscase and therefo 'e relay FF, is 'n ot actuated. v

A busy signal is transinittedito the calling I 7 BB r switchSON', "normal contact rl07, normal contact 108, back along theljower heavily j marked conductor, condenser, 109,- continug' ing'along the lower heavily n1arliedconducf tor and then overilinelirnb 10, to receiver of v the calling substation; returning over .line

limb 11," along the upper heavily marked" conductor through the left-hand winding of relay PR toground; llhecalling subscriber in response tothis signal replaces" his re d ceiver uponits switch hook, interrupting the t I H circuit forrelay PR and thereby causing 5 the restoration of the switchesused in estabof'relay 73:0fswitdh D the ground connec-i y lay 102 haying failed: to energize, alternate 'tionftocontacts27isi'emoved bytheopening a t of contacts 76, thus allowing relay 77 of I connector switchvEot'o de'e'nergize .as'th'e i e-i I t iof contact ST in this case was not closed. Therefore, upon decnergizationof relay 771a circuit for release relay HR is established from ground at contact PON through the winding of relay RR, normal contact 105, normal contact 84; to battery. Relay HR is thereupon energized and a circuit for release magnet RM is established from ground to alternate contact 106, and connector switch IE is restored.

Returning now to calling device F. From the foregoing description it will 'be seen that as all of the impulses have been transmitted and the wipers returned to hormal upon their last revolution, that the said calling device F is automatically disconnected "and is available for use in establishingother connections. i a a l1 While I have illustrated but three rows of keys as, e, 7:, it is apparent that any-number of such rows may be connected, depend? ing upon the number of digits or series of impulses in the called number. Even though the calling device F be constructed with five or 51X rows'of keys is, e, etc, the device is also adapted to transmit a less number of series of impulses than the number of rows included. For instance, in the device F as illustrated, a single series of impulses may be transmitted by simply actuating one of the keys la, m, etc, in the units row, thereby causing a single revolution only of shaft 37, or if it is desired to send two series of impulses, by actuating a key in. the tens row and in the units row, shaft 37 is caused to make two revolutions. It is also apparent that any number of keys a, b, 0, etc., may be included in a single row to transmit any number of impulses by simply increasing the number of contacts all, 66, etc, and constructing ratchet wheel 38 and impulse wheel 39 accordingly.

Operation of Fig. 3.-The operation of calling device G, which is a modification of calling device F, and which may be substituted for the device F, in theoperation of thesystem of Fig. 1, is as follows: In response to thesignal L the operatorjwould actuate listening key LK as before and assuming the calling sub'scriber desires connection with substation 123, as before the operator releases key 1K and then throws hey K, thereby connecting calling device G with first selector D. 'Iyheeoperator then actuatcs keys as, f, andlj 'n' to transmit the proper number of impulses as before described. Upon the actuation of the said keys, contacts 3), gQr, s, t, and it are moved to their alternate position as before, and a circuit for motor magnet M is established from ground through the alternate contacts 312, q, and r.\ a

Motor magnet M thereupon rotates shaft 37 and no change is efiected until wiper a engages contact are when a circuit for relay IC is established from ground through alternate contact a, contact no, wiper 36, ring -10 and the winding of relay IC to battery, energizing the said relay and due to the opening of contact 42',removes the shunt about impulse springs IS. At this time the upper contact spring IS is'resting upon the tip of projection P, and is out of connection with its fellow sprin thereby interrupting the circuit to relay R as before described, and upon the next step of magnet M the contact springs IS are again closed havin interrupted the circuit of relay PR a sing e time. Shaft 37" is advanced until wiper 36 engages grounded contact 111, when a circuit for release magnet MR is established from the said ground through wiper 36', contact 111, alternate contacts .9,

through the winding of magnet MR tobat tery, energizing said magnet. Magnet M then steps wiper 36' out of engagement with contacts 111, 111, interrupting the circuit for release magnet MR which deenergizes, restoringthe actuated keys and springs of the hundreds row. i

The operation of the system of Fig.1 in response to the impulses transmitted from the calling device G, is the same as previously described, so no further reference will be made to the operation of the switches of said Fig. 1.

Although the contact 7) was restored in response to deiuiergization of magnet MR motor magnet M still has an energizing circuit to contacts (7, r and continues to advance or rotate shaft 37 until wiper 36 engages contact 6?) which is grounded through key f, thus establishing an energizw ing circuit for relay IC, which looks itself to ground at ring 43, through contact 79,

ring 44: and wiper 35', the said relay IC removing the shunt about impulse s rings 'IS' due to the opening of contact if. Upon this energization of relay 1C; impulse springs IS are opened, as the upper spring is at this time resting upon the tip of projection PP and 'motor magnet M continuing to rotate shaft 37, the said springs IS are closed and once more opened and closed, due to the action of projection P, thus interrupting the circuit through conductors/22 and 23' two times. After the last interruption of the circuit through springs IS and after they have finally closed their connection, the circuit for relay 1C is interrupted,

neat this time wiper 35' has moved out of engagement with ring 44.

ltlagnet M continues to rotate shaft 37' until wiper 36 engages contacts 112 and 112, thus establishing a circuit for release magnet MR traced from ground at normal contact .9, contact 112, contact 112', alternate contact t and the winding of magnet battery; energizingftl the operation ofg-n'm locking-circuit fril- 10 said contact ca, thronght ithe dementia-e;

' traced from ground t nornmt"contact i;

. MB to battery, energizing saidmagnetwhich respectiveassociated "switch; springs 'upon "dc-t again dencrgizes t s-Jwiper 36? is stepped energl zatlqnythe lre s qlfatlon f the sand off: of contacts 1" 112" ,"illl d npon the deswitchspllngs em ay b eflected by the enerenergizntion of s aid njlgigl let'hilvthe switch gi'r t'oflo fthe"saidgnngnetg 5, springs which werel actuatcd lnlth'ethu'n- 't I [A 'lhe calhng demce HpfrF gy t dreds -10Wjl1fe rtqted flhe-nctation T01" is a lnuthficatlon of the QenceFnnd. may

shaft 37'- is Continuednntil wipe1g3GQen hesu t h edfqcsndfdevlce,Eincperating -gages contact m' fihen eagchfcuit"for relay the'sys'tem of Fig. 1'." flh'e rows" of k y g I0 is establisheddtzeto theground upon "and 1th; then associated, swltch" springs ,74, 2 etc, afejzwrangcd :similat ito the "keys" 6f callingfdevices F and G;gth

magnets MR- etc; also operating inn-similar anisnn' "op emtcd'in a d ifferent manne f that thc said wip er andimpulse Wheel 39 make only'cn ()l'utimi'in transmitting 'threefseyi es of in'lpnls es whilein the calling den t1mted-key n and K161111111 contact;qfl energizing ielay IC\ which stablishcs clocking circuit for itself th long'h'contact 79 over the previouslyidecribed 31th, utthtime 1 5 relay 1C is energized thenup'per impulse sp1-ing.'IS is resting upon the tip of p30 tinues the advanc thchsnid wipeifefifi 2'0 and 3G,, and upon ,e'z 35flnoving outpf engagement with mg; 4 4], the "enelt'g'izing 'cii cuit forrelay, 1C is interrupted, thus again placing a shuiht hcut impulse springs" I I H r IS, said springs 11 ting inten-uptedthe cin- I hunted s he'foi-e, thuscennectln alhng times; during- :thi si 1: t @said- 'cvolutipn' f-then actuatee I{eys' tif? and 41 thelfhy v w the last interrupticnbf anama nvipjeljj :a njdj '2 as befcre'lilni re pone ecpera 30 36" engages contacts-113' v again dehn ergizes 11' 11 3 1 ter'nate contact grounded ring reference is nec'es'sa K- -i restored, thus.d1scnnectingbulling' jdel: e lee; i s the sameiis revious'l V108 G from the firsbsclector D; Although thedmnd thOi'GfOlfQiUiS believed no fnr ma a-91m n 37 and as before nothing further occurs until wiper 35 engages contact 45 when a circuit for release magnet MB is established from the grounded wiper 35, contact 45', alternate contact 8 and the winding of magnet MR to battery, energizing the said magnet which maintains its armature attracted until wipe-r35 moves out of engagement with contact a5 and assumes a normal position indicated by dotted line NP. Upon the interruption of the circuit of magnet MR as just stated the said magnet deenergizes, restoring the actuated switch springs of the hundreds group. As the alternate contacts q" and r are still closed, magnet M continues to rotate shaft 37 until wiper 36 engages contact 5?) which is connected to ground through key f and normal contact 7;. When the said wiper 36 connects to the said contact bl)", a circuit for relay 1C is established from said ground connection, through wiper 36*, ring 40 and the winding of relay 10 to battery, energizing the said relay which looks itself through contact 79, to ring 44 and wiper 35 to ground. At this'time the impulse springs 1S have their connection open due to the end of said springs resting on the tip of an impulse projection and as relay IC is energized,the circuit including conductors 22" and 23 is interrupted. Magnet M continues the ad 'anre of shaft 37 until wiper 36 has stepped out of engagement with contact are, and wiper out of engagement with ring 44 thus interrupting the'circuit through relay IC and again closing a shunt around impulse springs IS after they have interrupted the metallic circuit two times. The advance of the wiper is continued until wiper 35 engages contact 45 closing a circuit for release magnet MR" from the ground connection to contact 45", through normal contact a, alternate contact t and the wind-, ing of magnet MR td-battery, energizing.

the said magnet whiclfmaintains its armature attracted until wiper 35? is stepped out of engagement with contact 45 and into the position indicated by the dotted lines NP, when the circuit for said magnet MB is in terrupted, dci n'ergizing it and restoring the actuated contact springs of the tens row. Key 11? having been actuated in the units row. shaft 37 is continued in its rotation until wiper 36" engages contact no, thereby establishing a circuit for relay 1C", traced from ground through normal contact q'f, key a, contact no. wiper 36, ring 40 the winding of relay TO to battery, energizing the said relay and removing the shunt from about the impulse springs 18 whose con-..

tact is at this time interrupted by an impulse projection. The advance of shaft 37 is continued until wipers 36 and 35 have passed out of engagement with contact ea and ring 44 respectively, which occurs after the third interruption between the impulse contacts 18 As the wipers 36 and 35 move out of engagement with their contacts as stated, relay IC deenergizes, thus restoring the shunt around impulse springs IS and preventing further interruptions of the springs having any effect upon the. circuit including the conductors 2'2 and 23 while the wipers 35 and 36 are restorin to normal. The last series of three impu ses having been transmitted, the wipers are ad vanced until contact 45 is engaged by wiper 35 theyeby establishing an energizing circuit for magnets MR and KM traced from the said grounded contact 45 normal contact 8 normal contact t, alternate contact a and the windings of said magnet MR and KM to battery, said magnets maintaining their armatures attracted until wiper 35 is moved out of engagement with contact 45 and into its normal position, when the circuit through the said magnets is interrupted allowing them to de'nergize, magnet MR restoring the actuated contact springs of the units row and magnet KM restoring key springs K. The restoration of contact springs r interrupts the circuit through motor magnet M thus preventing any further advance of the wipers. The calling device H being again at normal is available for furtheruse 1n estabhsluu g other connections.

Although I have illustrated in Fig. 4 a

calling device for transmitting three series of impulses it is apparent that as in F and G, by adding more rows of'contacts, such as a, b fetc. and their associated contacts I), 8" and adding extra divisions to the rotary switch that any number of digits or series of impulses ma The device as il ustrated is also adapted to transmit a single series of impulses or two series of impulses. For instance, if it is desired" to transmit one series of four impulses, by actuating key 0 the contacts dd will be grounded and motor magnet M rotates shaft 37 as before, until wiper 36 engages the grounded contact dd, thereby causing an energization of relay IC and allowing four interruptions of the circuit including conductors 22 and 23 Shaft 37 is continued in its rotation until wiper 35 engages contact 45', thus closing an energizing circuit through magnets MR and 'KM", thereby causing a restoration of the actuated contact springs 0 ra and preventing any further advance of shaft 37 the wipers being maintained in the position indicated by the dotted line NP'.

Assuming the wipers are in position NP and should the operator desire to send two be transmitted in a set.

series of impulses, she would actuate a key in the tensrow and then in the units row, thereby causing magnet M to rotate shaft 37 over two groups of impulse controllin contacts and until the wiper 35 has passe number of keys, a etc. actuated i w operating inycoiinection with apreferred I y I telephone system; itis to bexunderstood thzit pulses, corresponding in digitvalue to said for impulses; said series corresponding 'nums her to the number'of'keys actuated? 40 a switch controlled saidflkeysQfor trans fs viteh controlled by said lreys a'nd ha ing the normal position s i1lustrated3' Frommeans for-effecting an f opera tion ;ofj'said .be transmitted in a set," according to" the number to themumber' of keys gamma-,

keys of diiferentldigitvalues; en'electromagy 1 netically tdriveniautomatic sw ltch l fortrans f jate i keys;

pulse keys ofdifferent digit values fone it ries corresponding-in to the number A callingdevicecoinprisiiig elkeyhoarldfaiidgmearis'ffor{ reyentin fl aidgwiperland switch to cause sucli actuationof said vs iperg conta'ct'sfor said Wheel adapted to be operoutof engagemeiit It {K llie and the foregoing description; it 'willibe" readily [switch responsive-to actuation of anyone of seen that one or more series or 1rnp1'1lsesmayfsa1d keys; Y

While I have}illustrated' my"invention a U y y I arid adapted to operate'for transmittingim my invention is "not limited to anyparticu ;\;kjys, and meansccontrolled'hy"each'key fore lar system but is applicable'to any system efifecting an operation: jofv saidx switeh for in which directiveimpulsesiaretransmittedf ea'chwkey actliated,.; V cont'rollin yaiitomatio, switches,' and}, 1 9. Af'callingcfdeyice including va {set 0f while I haveifiustrated my invention with] r manuallyoperatedimpulse keys, an autoseveral modifieatikms' I idoiiot' desireto i natiq SW Ch0QI T0 d" y ,Siiid k ys 0 limited to the strilctures asshowniasmany l=transm tting;impulsescorresponding{tothe modifications andchangesmay lbe made:ft digit value o f;tsaid; "keys,bar' d :electric ll fg without departing from the spiritands'cope actuated means controlled bysaidswitehafor of llt :fr fiasingga keyW enectuated :s What Ielaim asnew andjdesire-to secure by Letters Patentis: Y a withiapluralityioffsetsof ma ually aper-o, '1." A ea1lin -deyice comprising-impulse .lyated impulse ekey syof an automatic switch keys and aI e ectromagnetically driven an; adapted to operate "for transmittingjim-j f tomatic switch foritransmitting Variable se? ries ofimpul'ses said series corresponding in keys, means forflefieeting an operation of 1 10. In: a calling device :the jcombiiiatiori a i I y said switch lresponsiveto actuation gofeny; 2. A- calling device comprising-{impulse ,Qne :-0r\m0re of 'said keys, aiidimearisfeone 1 trolled by sald switchfor restor iiigtheactu mitting impulses corresponding ,in yalue 1 1. A'calling device oo1i1prisi11g'a" 1ilural;

to said keys,and' ziiieans"fdrj operatiiig said; ofjsets,0fim u1serkeys, auautomatic i switch to transmit yariable jseries' vof in iswitch controlled by said keysa'n'd" adapted into Operate for; transmittinguseries fofluim {pulses correspoiidiiigftothe iiurriber of setsi 3. A calling deyice cemprismgszimpulse of keys, means"foryoperatingfsaid switch to, keys, and anautometicsWitch controlled by; transmit variable 'series of,'impulsesaecordf said keys'for 'trans riittiiigyariable;series Qfyinga to the; ji umberfofckeysyactuatd ands 4 ansgtofprevent said switehYfrom" trans I t'ting more series, of impulses.than keys actuated. )I'iyh 12. A call ingdeyice c omprisi I plural 'f'ity' of sets of impiilse f keys; a1"progressiye,

. 4:. A calling device comprising sets of'im each digit ineach set, and am automatic control 1 contacts and .xa eoti'peratiye; {Wiper-f a ap ed ib fo mtede slu be ji 'i im r fcor-responding'to theinumberbf sets o'fykeys,

mitting variable Z series ,01, impulses, saidse-f of keys actuated.

' 1 contacts f-jfroin [co6perating'xm0re times "than 1 the etarek ysactuetds eys, a progressive switch cont'rolled by v keys and adapted 7130" travel" a definite idi's-x tact set for eaehkkeyactuatediand con e ,;;mn responsiv'eito"operation 'of aiiyonejof' '7 tions extending ifrom Q keys] to? said said keys an impulse whe'el and co'giperative 6. A callingdevicecomprising};plurality L'fated ay definitenumber o f times :by] each 0p; I t ,1 of sets of ii'hpuls'e keysr riiiltiply cohnected, erationbfsaidswitchi and means controlled aset of iasjsi'vefcoiitacts common to sa id keys said lteys for rendering-said coritacts sf-g e f and connected thereto, ayytiperfcoiitactfor+fectlve according -60 o y i r o y i theidi'gitf'valu eithe said contact set; and meansfcontrolled; by? key actuated. 5 l; said keysfor-mevingsaidfyyipertontactover 1/55. In] a 'ca lllr g device the c0mb'1nat on said contact set j oiice for eachkey/actuated. "with a fplur ality of setspf manually t ger 1 J y 7. A ealliiigddevim including sets of im *-"ated impuls ;k ys g jl avmg"idlfif gnt 11gb: pulse keys, anf automatic swit chfjada te'dto valuesysofair autom t c switch c outrolledby operate for transzriittingwi hpulses flfsaid keys'andi adaptedltoioperatejoretrans I n aut'oni'atic; switchfcommon tolsaicl keys Q pulses correspondingrin'ydigityalue to saidf, not

13. A1 calling; dev ce 'comprisiiig intiiuulse j mitting series of impulses corresponding in digit value to said keys, each key being adapted to control a-series of impulses, means for effecting an operation of sa d switch responsive to actuation of a key in each set, and means controlled by said switch for restoring each key individually after the series of impulses controlled thereby have been transmitted.

15. A calling device Comprising a plurality of manually operated members and impulse mechanism operated responsive to actuation of any one or more of said members.

16. A calling devicevcomprising sets of impulse keys, anautomatic switch havmga set of contacts multiply connected to said. sets of keys, a wiper for said switch adapted to cooperate with said contact set, and means controlled by said keys for causing a cooperation of said wiper and contact set for each key actuated.

17. A calling device comprising sets of impulse keys, an automatic switch havinga set of contacts multiply connected to said sets of keys, a wiper for said switch adapted to cooperate with said contact set, and means pulses.

including a starting circuit. common to and controlled by said keys for causing a cooperation of said wiper and contact set for each key actuated.

18. A calling device comprising a key board including a plurality of impulse keys, and an electromagnetically driven automatic switch controlled from said key board. fur transmitting variable seriesof impulses, said series corresponding in number to the number of keys actuated.

19. A. calling device comprising setting members, impulse mechanism connected W113i],

said setting members, and means operable by mo or more of said setting members for causing operation of said impulse mechanism.

20. A calling device comprising a keyboard including a plurality of impulse keys, an automatic switch for transmitting variable series of impulses, said series corresponding in number to thenumber of keys actuated, and means controlled by said 1111- pulse keys for effecting an operation of the automatic switch for transmitting such 1m- .21. A calling device comprising sets of setting members, normally inoperative impulse mechanism connected with said setting ing the operation of said impulse mechanism.

22. A calling device comprising impulse keys, a normally passive automatic switch adapted for transmitting variable series of impulses according to the number of keys actuated, and means controlled by said keys :Eorgcperating said automatic switch.

keys for transmitting variable series of immembers, and means actuated by the operation of any of said setting members for caus- A. callingdevice compr sing 1 keys of different digit values, a normally passive automatic switch adapted for trans mitting impulses correspondin invalue to said keys, and means controlled by said ima pulse keys for operating said switch to transmit variable series of impulses according to the number of keys actuated.

mitting impulses corresponding in value to said keys, means for operating said switch to transmit variable series of impulses, said series corresponding in number tothe number of keys actuated and automatic means for restorin tbe'sai keys.

27. A cal ing lhdevice comprising a key board includinga plurality of impulse keys, an electromagnetically driven automatic switch controlled-from said key board for transmitting variable series of impulses, said series corresponding in number to the nuns ber of keys actuated and "automatic means for restoring thesaidkeys.

28. A calling device comprising" impulse keys and an electromagnetically (lIlVBIl automatic'switch fontransmitting variable series of -impu1ses,.said series corresponding in number to the number of keys actuated, and electrical connections from said keys to the stid'switch. 7 a

29. A calling devicecomprising impulse keys of dilierent digit values, an electromag netically driven automatic switch for transmittingimpulses corresponding in value to saidkeysynieans for o crating said switch to transmit variable series of impulses, said series corresponding in nuinber to the num ber of keys actuated, and electrical connections extending fnfom the said keys to the said automatic sw tch.

30. A. calling device comprising impulse keys, an automatic switch controlled by said' pulses, said series corresponding in number to the number of keys actuated, and electri cal connections-extending fronilthe keys to members, impulse mechanism electrically .connected'with said 'setting members, and means operable by one or more of said not ting members for; causing operation of said ita impulse mechanism. 1

matic switch. v

32. A calling device comprising sets of said setting members, and means actuated by the operation. of anyof said setting memhers for causing the operation of said impulse mechanism.

33. A calling device comprising impulse keys, a normally passive automatic switch adapted for transmittingvariable series of impulses according to the number of keys actuated, and electromagnetic -mans controlled by said keys, for opei ating said auto- 34. A calling device comprising impulse keys having a normally passive automatic switch controllable by said keys for. trans mitting variable series of impulses corresponding to the number of the actuated keys,' the said keys being electrically connected with the automatic switch.

Si -ned by me at Chicago, county of Cook, I

of Illinois, in the presence of two andgtate witnesses. I

I ALFRED H. DYSON.

Witnesses r y M. R. Roeirrono, GEORGE E. MUELLER.

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