US1220228A - Telephony. - Google Patents

Description

I3 SHEETS-'SHEET 2.

L m nu H 3 S.T. |.V|P. rrNE LOS UHD HHH. .LH SEN .T0 D T o oooo evoca no. o oooooo-ooooooo o oocoonooooqoo 7 {Nasa/:J V- y @www no 2x 65 VL @A f/f. N64/,QU

D. s. HULFISH.

TELEPHONY.

`APPLICATxcm FILED SEPT.30.1912.

Patented Mar. 27, 1917.

I3 SHEETS-SHEET 3- [Nv: Nvo/1I n. 3.4HUL51SH.

`TELEPHonr.

APPLICATION HLED SEPT. 30, ISI-2- Patented Mar. 27,1917

rasHEETs-snn 4.

13 SHEETS-SHEET 5.

Patented Mar. 27, 1917.

+w Nuvi, L .vw f l t OOOOOOFAWU$`O D C.OOOG,OOOOOOQOOOOOOOO .am ooooowvmvo omooocoooooooooooooooooo 9 QOOOm'w@O O 000000,000000000000/0000 1 .IIiIIJ ooonooooNo oooooooooooooooooooooo 0 w itlll, H 3 OCOOOOQUDOQOOOOOOOOO-OO00000000 vNlH ooooooooocooooooooooooooooooooooo rr E LOS ,mooooooooooooooooooooocooooooooooo HD WFM ooooooooooooooooooooooooowqooocoo .tl N v .LF oooooooooooooooooooooo SEN ci Tlo DODQOOODOOOOOOOCOOO. M D M woocooooooooooooooooo m .Ilm GQOQOOGOOOOOOOOOO-DOOO H t M 23M oooooooooooo [NIVEA/Ton',

D. S. HULFISH.

I atented Mar. 27, 19172 I3 SHEETS-SHEET 6.

r ATU, l :1f +2. u L JJ oaooooooo ooooo ooondionoo r ooooooooo ooooo ooomonoooo@ ooooooooo ooooo. ooonokooooo# noooocoqo oooAoO 0:33 :3323 [VII `ooaoooonc ooooo ooiorooooenm 000000000 00000 0000 0000i@ oouoooooo ooooo ooooooooom 000000000 00000. 000000000@ 000000000 00000 OOOCDO@ oooonoooo oobwo ooocwconco obouoocoo conso oooonosooo 000000000 00.000. OOOOOOG W W IL M v ||l||l n* um. M T N f M m7 04M J l 1 5 E N nps. HvuLFlsH TELEPHONY* APPLICATION FILED sEPT.30,19l2.

1,220,228.V I Patent@ Mar. 2f, 1917.,

I3 SHEETS-SHEET I.

D. S. HULFISH.

TELEPHONY. APPLICATION FILED SEPT-V30. 1912.

Patented Mar. 2.7, 1917.

13 SHEETS-SHEET 8.

13 SHEETS-S Patented M5112 D. S. HULFISH.

`|ELEPH0NY.

genoa-ola oo nooo, oo oo oooooo oo ooo ooo om ODOOOOOO APPLICATION VFILED SEPT. 30. l9l2. 1,220,228.

oouooooo ooooooo uonooocoo V/TNEssEJf-- w' 'M n. s. HuL'FlsH.

TELEPHUNY. I APPLlcATlo'N msn SEPT. ao, 1,912.

Pa bented Mar. 27, 1917;

la SHEETS-SHEET lo l oocaoooo INvC/vi-o D. s; HuLFlsH.

TELEPHONY. y APPLICATION` FILED SEPT 30| |912.

Patented Mar. 27, 1917.

I3 SHEETS-SHEET Ii.

I n' VENTO R,

n. s. HULHSH.`

TELEPHONY. APPLICATION FILE SEPT. 30. i912.

PatentdMar. 27, 1917.

` la SHEETS-SHEET 12.

VITA/ses:-

f /72 .MN/

D. S. H'ULFISH.

TELEEHUNYn APPucATmN FILED SEPT. 30. |912.

Patented Mar. 27, 1917.

1,3 SHEETS-SHEET I3.

'circuits will UNITED sTATEs PATENT OFFICE.-

DAzvrp s`. HULFISH, OF TORONTO, ONTARIO, CANADA, AssIGN on To CANADIAN INDE PENDENT TELEPHONE COMPANY, LIMITED, OF TORONTO, C ANADA, A CORPORATION OI'l IOANADA.

TELEPHONY.

Specification of Letters Patent.

Pa l'entod Mar. 27, 1917.

Original application med my 1a, une, serial No. 696,902. Renewed Augtst 7, 1915, serial No. 44,292. Divided and this application filed September 30, 1912. Scrirl No 723,229.

To @Il 'whom it may concern:

Be it known that I, Davm S. Hl'nrisu, cnineer, a citizen of the United States of merica, residing at Toronto, in the county of York and Provine of Ontario, Canada,

,have invented certain new and useful Improvements` in Telephony, Of which the following is a specification and a description of the manner and process` of constructing,r and using the same, intended to be in such filll, clear, concise, and exact terms as to enable an person skilled in the art to malte and us'e t e same.

My invention relates to telephone systems in general andto the a )plication ot' methodsl and a iparatus for telephone switching in central Ofiices of telephone exchanges, and 'this application is a division of my prior application Serial No. 696902, vfiled May 13, 1912, and renewed as Serial'No. 44292, Aug. 7,` 1915. In some of its details, itis particularly adapted to systems of the Lorii lmer type of automatic telephone devices and I have shown it in this aplplication applicd specifically to a system o circuits for the Larimer 7 type of'autoniatic apparatus with suggestions from time to time as 4to the general application of certain features of `my invention to the general art of-telephony in central'olices whetherautomatic or manual,

My invention has for itsl Objects the fo1-.

lowing: f-

(B) A. method of calling among lines entering an. automatic telephone exchange whereby the orderof answering,r Icontemporaucously existing calls'mayI be varied from time to time.

(C) A combined sequence switch and division starter. i i

' (D) A system of tcst circuits'for deter miningl tho busy or idle conditionof a tested circuit` whereby the tested circuit may have either of two potentials impressed uponit during; its busy condition andthe testing reject it if it bears either potcntal. i

(F) An improved system for testin a 'tclepl'ouc `line for busy or idle condition, md the subsequent adji'istrnent of automatic switches in accordante with the result of the test, including a locking relay for recording the,rcsultofLthe transient test, the

relay being held l( cked for a sufficient time for reliable operltion of the automatic switches requiring control subsequent to the test and dependently upon the test.

(G) An impl-Ovid system of comlnutators and associated circuits for ringing code ringingr upon party lires in an automatic telephone exchange.

(H) An' improv 3d system of controlling circuits for an aut )matic telephone Connec tive apparatus, controlled by Vthe two telephones of the connection, and controlling the release of the connection at the Will either of the tclopl one users.

(K) A system of lamp signals for a'n aLitomatic telephone axe-harige in which a different order of signals is produced when the line called for is bu sy as compared with the signals produced vhen the line called for is tested and `founo idle; also, an improved signal in a set of4 lamps whereby two lamps each having a defirite meaning when burn.- ing alone may be caused to burn simultaneously to express a third and independent ilnprovld timer device or slow 'connection with an automatic lamp alarm and release device whereby the attendant in charge of an autoinatic exchange may disable either the autcmaticrelease functions of' the .telephone oi ice or the .lamp alarm fllnctionsof the telephone office, but not both. p

' (Q) `An improved multiple brushjor an automatic switch) enga-ging a pluralityof Contact points on they same level and Closing through -them a 4plurality of simultaneous circui l (R) A brush arrfngement bywhlch two independent multiple' brushes act uponthe i .106

same level of-contact points and close simulitaneous and independent circuits through `each circuit being cle'of' the switch,

the same level of oints, closed twice in a single cy one closure for each multiple brush. a

(SA) A system 'of mutual circl its between two automatic switches, such at the return of either to normal. will 'return the other to normal also.

(SB) A system of main circuits and of auxiliary circuits in an automatic exchange, such that the control of an automatic switch normally by a line and its telephone is substituted by a central ofiice auxiliar circuit in case the switchl has no connected line.

(SC) A. system of circuits by which the pilot switch when at normal restores otherswitches to normal, namely, the primary connector and-,the signal controller.

(SD) A system of driving devices and circuits `for a. timing device whereby one timer may bedriven at diiferent speeds at different times. l

(SE) I provide a division starter with a timing device whereby a second division will be started in case the first does not respond promptly.

(SF) A novel .disabling circuit ior a di` I vision starter when all divisions are busy.

(5G) A method ofusingduplicated devicesor electrical circuits having a common estination by using them in order of--rota- (SH) A method of using a group of electrica-l circuits having a common destination by dividing them into t-wo small groups', one small group used in rotation and the 'remaining small group used' ashan overflow group and used in numerical order of precedence.

(SM) A system and method of metering calls in. which a. 'call is recorded' upon the meter of the calling line only as a result of the response of the called line;

(SN) A detail of metering 'system for eneral application in telephone exchanges y which certain lines may be designated as free servicel lines andy calls terminating upon these lines lwillnot register upon the' .meterof the calling line when the free l service vline responds.

A *System forseizing al -busvy line with disregard o f the guard-ing condition.

ibers station su itable for a party line havprimary 2 shows-the circuits of the pilot andthousands or ringing register.

switc l' "Figa 3 showsthe circuits-of the relays,

commutatore, division I other apparatus.

timer and sundry SQ) improved rtlelephone'j for a'sub- I ephone Fig. 7 shows the circuits of the line relays constltutin ,the decimal indicator.

Fig. 8 sgiws 'the circuits of the decimal controller.'

Fig. 9 shows the circuits of the division starter which is also the permutation con-VA troller for the line relays or decimal indicator.

Fig. 10 shows the circuits of a telephone for aline having but one telephone.

Fig. 11 shows a simplified diagram of the circuits for-conversation and for release under subscribers control.

Fig. 12 shows the circuits of the rotational busy test.

Figs. 13, 14 und 15 show details of free meter lines.

Fig. 16 shows the circuits of :l telephone for a party line.

Fig. 17 show-s a party line telephone having interference features for party-line. I

In the figures, numerals smaller than l100 i are not strictly vreference labels within the ordinary meaning of the term; they. are nu#l lnerals indicating-theA order or relation of the parts adjacent to-which they are found; or to which they directly pertain', as indicating the order of Contact points in a row, or the order Aof rows in'u contact bank; for example, the numerals 1-tof44 in Fig. are 'stampedupon the apparatus as builtand used, and'form a part of the apparatus illustrated by the drawing. Reference numerals 101 to 199 have been reserved for conductors entering the pilot switch, 200 to 399 for apparatus parts, and 400 and higher for miscellaneous conductors. Like numerals refer Fig. 4 shows the circuits of the signal controller.

Fig. 5 shows the circuits of the. interconnector or trunk selector.

Fig. 6 shows the circuits of the secondary connector or B-switcl1.

.so l

The switches.

` The switches are of three types, called the cylinder type,`the register type and the coiniuutatortype.'

A switch of 'the'cylinder type is illustrated in Fig.: The horizontal rows of small `circles represent' the fixed contact' points projecting Vfrom Athe.', clevelopcdinner surface of an 4annular casting of insulating material; upon these. contact points there move horizontally from leftv to righta set of brushes,I shown in the figure as small flat parallelo( grams restn upon the points ofthe first vertical set o points. A controlling magnet or clutch magnet213 has an armature adapted toengage a notched disk to restrain the passing through it, its armature is withdrawn from the notched disk and the disk is permitted or caused to revolve., wrrying with it the brushes of the associated cylinf der. rlhe disk (and therefore the brushes of the switch) may'stop only in positions corresponding to notches in the peril'ihery of the disk, and these notches tl-ierefore.'represent the only possible. stop positions of the brushes of the switch.

`In the primar)Y connector of Fig. l the stop positions of the brushes are all but one in the first quadrant of revolution, as indi'- cated by the location of eleven notches in the clutch disk.

In the pilot switch of Fig. 2 there are fourteen stop positions, irregularly distributed. The vertical sets of contacts of the cylinderA are ynuinliered horizontally Lto-44, the stop positions of the ln'ushes'are numbered in the. line above, Lto-14, cach number appearing twice, over each 'of the two adjacent sets of points occupied b v the main set of pilot brushes in each of the indicated stop positions; the brushes uornially when not in use upon No. 1 stop position, or contact sets l and 2. cylinder points are numbered l-to-l-*l from top to bottom. at the left.

The pilot switch, of Fig. 2 has also a set of auxiliary brushes, three pairs on 3rd, 7th, and 9th levels, respectivebf resting nornialhyy on points of 34th and 255th sets and moving with the main brushes. ofthe 7th level are connected b v a wire to the auxiliarybrushes of, the same level.

In the signal transniitter controller of Fig. ,4` the clutch disk has four' notches. The

`disk is geared to the brushes in the ratio of one revolution of the disk for two lrevolu tions of the brushes. The complete cycle of operations of theswitch is effected in two complete revolutions of: thelqrushes, or one revolution of the disk.l The stop positioner ofthe brushes are: normal position on con tart set No. l first stop position on contact set No. 43 ust before the end oil the first rev# olution;,second stop position ou contact.. set No. 1; third stop' position on .Contact set No. 43 just before the .end o-f'the second revolution.

r[he intereonnector ond-ary connector ot Fig, G are switches sunl- 'lar to that ot Fig. 1. The division starter.

of Fig. l) is a switch similar to that of Fig. 2 but with a different distribution. o'f stop notches, without a register, and with a single.

The horizontal rows ofi 'lhe main brushes `of Eig. 5 and the sccpoint, middle of bottom row of bank, connected to conductor 105. When two points nre engaged by tno connected brushes, the points are indicated by a hyphen connection, thus: pilot points 1X13-12 where the 4engaged points are i1 the sume 'vertical row; or pilot points QYXB-QSXB, pilot points 39X7-7X7, where t 1e engaged points are not in the same verticil row.

A switch of the register type is illustrated inFig. 1. at the top. .The arcs of small cirY cles represent rows of fixed Contact points, upon which move the brushes shown as small rectangles up )n set'No. 0 of the points. The brushes are car ried by the ratchet, which is under spring te ision against the pallet, and' which is permitted to move step-by-step under control of the register magnet 214. This register com lvlete, is carried by the mechanism carry-iur the cylinder brushes to which the register parts are wired. It is restored to normal position after having been operated", by mechanical devices which restore it during 'he second quadrant of re\olution of lhe c utch disk.

The ringing register of Fig. 2, is in fixed positioinebut is loert-ed adjacent to an associated cylinder sw tch, and is restored to normal bv the retu `n of the adjacent rvlinder switch, such as he pilot switch of Fig. 2. 'Tl brushes of the register' are reversed, ii ing om right to left.

i luf i gisters of "igs. 5 and (l are sin'iilar to that of Fig. ard are. similarly restored.

A switch of the ioinniutator type is illustrated in Fig. S, the decimal register controller. The develtped ronunutator ringof long segnunt 2552 ar d fifty smaller segments` with its associated l rushes, coiuluetors, relay and clutch, form tire decimal register controller as' a whole, whose function it is to operate the. decimal register ol' va started division to .seizure of the. callirg line.

There; is one deiimal register controller foreach switchboard.sectiou or group of divisions, one such controller thus serving all'l of al' group of lines and` controlling. the decimal registcrsiot all 4the corresponding group ofconnectivo divisions. y

The decimal register controller brushes are equipped. withn t directly acting clutch, which starts its assfciated brushes when the 'clutch magnet is cm1-god and-stops them cates and the switch accomplishes its el`ectrlcal cycle in one-half revolution, there rcsult from the four notches but two stop positions, first with a brush upon the fortysixth small segmen'., 230,and second with the same brush .upon the ffteth or small assist in the identiiicalion and shown in Fig, 10.

f cally, preferably.

' is shown attache segment, 231, the companion brush in each instance being upon the long segment 232.

The switch of Fig.' 9 is the division starter und linesequence controller. 'lhe pilot clutch magnets of thel connective' divisions when normal are charged only through `the starter. 'lhe clutch magnet of the first connective division is shown at 215 in Fig. 2, being connected to wire 121, which is shown attached to cylinder point 3X6 in Fig. 9; thc corresi'iondingwire of a second division is shown attached to 'cylinder point 7X6 in Fig. The division of Fig. 2 is further associated with Fig. 9 by the wire 128 shown attached to cylinder point 3X3 in F ig. 9; the correspondin wire of a second division to'cylinder point 7X3 in Fig. 9. These two wires upon cylinder points 7X6 and 7X3 in Fig. 9 nrc illustrative of a second complete division such as shown in Figs. 1, 2, 4, 5, 6 and parte of Fig. 3. The starter is sole per group of divisions, (say six to twelve) and per associated group of lines (say one hundred).

' The esclusiva line telephone.

The automatic substation telephone com prises the usual items of a telephone set, and 1n addition an automat-ic call sender. The circuits for an exclusive-line telephone are Grounded brushes, 240, of which. four are shown, are adjustable by projecting buttons moved by the telephone 4u'ser accordlng to indicators to place ground upon one pin in eachsegment (about a quadrant, as drawn) ofa circ'le of pins 241, which contains several ,such segments,.and upon which a. con# stes.-

'ihe devices of the central oice are ada-.pted'to' send. forty-two impulses for the control of the calLsender escapement, fortyonei from the signal controller and one from conjimuta or No. 8.

To set he signal transmitter to effect. connection th a desired telephone substation, @the indic `oir-*buttons are set tothe directory number f that substation by moving the buttons iride endently to positions in -Which they will in cate the desired directory num- .connective divisions, y the crank which winds Leemans ber. The wires from the first two indicator points of each set to the contact pins in the circle engaged by the erm 242 are shown in the diagram, Fig. 1 0. The remaining points are connected in corresponding manner, except the last or tenth point, (directory numbcr 9 which is left unconnected. Contact nrm 242 normally engages the pointl 243 and thus normally holds the talkin bridge subject to contro by the hook switch 246. Connection from the first conductor of the line 42,1, to the arm 242 ismoved forward mechanically one step by lthe operation of starting a call, it engages a contact pin 244 which is connected directly to earth or through a return wire to minus battery.

A switch, 247, composed of a pair of contact springs, is adapted .when closed, to complete the circuit for the stepping magnet `248 from the second conductor of the line 4,22, to earth. The springs of the switch 24"( normally are disengaged from cach other but are forced into engagement by means of a cam lever 249 moi-'ed by n. cam disk 239 cured to the shaft of the contact arm 242- A notch in the cam disk 239 permits the springs of the switch 249 and to disengage arm 242 stands in the in connection with pin themselves when the normal. position, or 243. When the zii-.11

.-242 is moved from its normalposition, bly;

the action of starting the call, the cam dis 239 operates the lever 249 to close the switch 247, the disk 239 then. preserving the closed condition of the switch 247 until the arm 242 completes its revolution and resumes its engagement-with the pin 243. l

The lines entering a central office are divided into groupsof, say, one hundred lines per group, and the' automatic equipment of also, each group of apparatusl serving a group of telephone lines; such a group of apparatus is called simply a section. I

In each such section the switches for the most Vpart are each lgroup 'or division constituting a. connective unit analogous to a switchingA cordair e uiplnent i-n-"a manual telephone switc board. T he automatic switches whichmake up .a connective unitor connective division in the 247 to move the arm' a switchboard section, or

grouped into .groups called the central oiiice is for the most part divided '105 figures ofthis application az-ei: primaryconnector orA-line switch', Fig; 15 pilot switch and thousands or ringing reglster,A Fig. 2;

relays, ti'mer, lamps, condensers, resista-nces,

Fig. 3, signal controller, Fig. 44; interconneetor, Fig. 5; secondary connector or B-line switch, Fig. V6.

The automatic' switches of a section, common to all divisions, are decimal register controller, Fig. 8; division starter. Fig. 9.

The total process of connecting two lines lib line'.

automatically in such an office comprises: (Il) A primary adjustment by which a connective division associated with a calling (2) Selective adjustments by which circuitrselecting switches are adjusted to select Such circuits as Will result ultimately7 in associating the. connective division with the line desired by the calling line and indicated bythe preliminaryma'nual adjustment ol its `call sender. (3) Test and preliminary ring `by which the line selected is rung upon 'if not found engaged. (sl) Repeated ring until the call is answered.

(tl) Restoration automatically of all parte l of the connective division after conversation and release. (7) rlln-ouglioutall of these l operations the coni'iective division superH i' circuits, or both.

the units set. The charging ol. a line r ing wires inl two se '40` electrical iiiotential upon -relay and the other paii vised. b v system of lamp signals lwhich operate to announce normal action, and abnorl'nal action, ifany. (S) The division is furtl'ier guardod i by autoi'natically `operative restoring or normaling circuits and devices which act to restore it to normal condition for further service in event of abnormal operation. (9) Specialservice requirements compel some cialis/.ation of apparatus or Early 'forms oli' decimal iniflicators, corrl str1 ed for one hundred lines', have comprised a.' rotating device capable of being stoliiped 1n one hundred dificrent positions,

. eacli position torresl'ionding4 to a line served by the device. When lthus stopped by a calling line, the decimal ind` fator identified the calling line by placing an electrical po tential upon two identified. and line-identity?- i. l n Wires and one wlre being ltiltnitihcd in each set. '.Ifhese sets were the decimal set and. tbe unit By the wire id'cm'tilied in the dect nia] set, the tens digit of the Iailing liuc iti lied.

was made known, and by the wire ii ne callin the units son the unite dig-il'. of l ing linewas made linoivn. The biennal inthe tens set correapiindl .ing two 'coiuluctore which in turn identify the line, the subsequent selection of the line being act n'lplished by a ctmmsetivo divisionupon fundanlel'ital principles lnnfetofore used 'Xssciiciated "with each line `l l y is a cut-oii` .elay l associated with cai. i units 7wire is an add1tionalsignal relaya or Maintenance ot a, `condition tor conversation afl'ter the ring is answered and release `by subscriber-s control.

each set comprising tpn quence relay, making .l bank of two hundred ten relays in all required for a con'ipletely equipped decimal indicator for one hundred lines.

` (B) In the rotating decimal indicator the calling lines were serv id on either of the two principles of selectior. dependent upon the circuits used. `The i 'st principle was `that the lines should be ser ed in lrotation ast-hey might call, the search icing made in nulnerical order and each call ng line being assigned to a connective division before the rotating decimal indicator prrceeded further in its search, the rotating,r evice being held mo tionless upon a callirg line so longr as all. connective divisions w are engaged. The sec ond plan was that lines should be served as in the first plan until all cornici-.tive divisions became engaged, after which the rotating device would not stop upon any calling line until after a connective division had become idle and in cond tion to serve the line. The second plan therelore left l o a matter of chance the selection ol one calling line from several calling lines, when, all col'inective divisions having been bl sy, one connective diivision was released ald Inode available for serving one 'of the sev ral calling lines. In my improved system, the lines are arranged in a series circuit in an order wl'uireby cer-- tain lines have precedence over all. others Aand are served in pretedencc when the connective divisions are iusuliicient to serve all calling lines. To guard against innnoderate use of the col'mectiie divisions by certaili favored lines'to the exclusion of lines less .favorably located upon the series circuit, I provide a permutation de'vict` which from time to time changes tl e order oi precedence of the lines and therebf distributes the servs ice ot a group of conrective div .nous more uniformly among the lines served by that group.

(l) fl` accoi'nplish tl e peri'nuting require-` ments above recited b l utilizing the c vliitder switch ot the div sion starter. ln the drawings which accompany thi sperilration, I show the lowest six levels o'lE tbe division starter cylinder tlius utilized.

(D) The full economy o't' a trunk circuit, having' a minimum nl mbcr of conductors. :in an autolnatirl telephone exchange ran be realized attiules only by usingsomo one conductor for more than one function in the in'ogress Vo1 setting up, maintaining and disrluiling a" connectie i. l 'have met a reouirement oi this natu 'e by using the same conductor for the operation of the clutch of a test switch and for a busy-test conductor o ,'ering a condition s litable for electrical `test to deteru'iine whetl er the distant switch is in normal position 1' otherwise. As the conductor thus used w ll vary its l'iotential from time to time as operating currents do found to test engaged. or free.

or do not pass over it to control the distant switch, 1t necessary for the testmgVcircuit at any moment to show that the distant.

switch is engaged, regardless of the variations of potential upon ,the conductor serving the double purpose of switch control and lousy test. I have provided. three different potentials in the automatic central oliice ofV which two may be applied to the conductor in question for such switch control, the third being applied for test purposes the test-and control conductor being so associated with apparatus that it will be entirely isolated only when the distant switch is idle, so that no current will flowfrom the testing devicesy to the wire invquestionv if the switch be idle but tan'rent. will flow from the test devices to either of the two operating potentials `if.

the switch be busy.A By the iow of current from the test device, it may be known that the distant switch is busy and the test device may be controlled in accordance therewith.

(F) In the automat-ic telephone4 system shown in the accompanying drawings it is necessary to adjust the selecting switches to variant positions according as selected line If the tested line be found. engaged, the pilot switch is advanced-immediately after the test, but if the tested line be found free, the signal controileris advanced immediately`- after the test and the pilot switch is advanced subseiplently.

To provide ample timefor moving these switches to their position of adjustment in accordance with the result of the test upon the selected line` I provide a locking test relay which by lockingA w'ill record the result of the ter'st indefinitely or for such a length of time as may be required for the adjustment of the selective switches involved.

To insure the maintenance of the locking circuit for a sufiicient time to mve`the pilot switch, I carry the llocking circuit throughA thepilot switch.

(G) 1n my improved system of commutators for ringing in code manner upon party `lines., I provide commutators each of which produces-a group of impulses arranged in a code manner,'and I cause these commutators to repeat each group of 'impulses as frequently as feasible. In orderthat-the code ring upon a telephone line may be repeated less frequently, I provide an auxiliary comniutator. My auxiliary cominutator is so designed and so connected inthe circuitsv of the ringing devicesltli'at it p,ermits"the op! eration from timeto time of one group of the code impulses, withholding theoperation of the intervening repetitions of the group. I do this by connecting in series in a single circuita fast and a slow comn'ultator,x and so associating the commutators that the vslow commutatof'will be closed `during onecvcle of thefast commutator and `be open for ar predetermined number of succeeding cycles.

^ I provide also in the pilot switch tworinging positions. In the .tirst ringing position, the fast commntators are effective to ring at all times; and I-provide means for permitv ting the pilot switch to remain 'in this position during one and one only cycle of the fast commutators, thus attaining a single initial code ring, with. a minimum ,of delay before such initial ring. v

In my improved system of controli -ling circuits I provide four stop 'positions for the pilot switch in which the further movement of the pilot switch, and therefore the entire command ofthe connection, is under controlof either of thetwo connecte'd telephones.

next position, pilot vstop No.1() is,l held Inthe first position, pilot, .stop No. 9, the. lifting ofcithertelephone from the hook will advance the piiot. Y The when the Adine telephone is of the hook and the B-line telephone is on the hook. The third position, pilot stop No, 1'1 is held -when the vA-line telephone is on ythe hook Iand the B-linetelephone is olf `the hooi;v The fourth position, pilot stop No L? is held when both telephonesfare oli' the hook and the pilot switch is advanced by hang-- ing up either telephone. Advantages are 'formed in the control of the visual signals indicating the condition ofthve connection, and advantages are foundin the complete system of control by'which connection atl all times is under complete controlA by either telephone without any operation other than the usual hook-switch operations common in either automatic or manual telephone usage. (K) In association with a connective di-- vision, I provide a` set of signal lamps and a system of lamp signals by which the condition of the connective division may be known. These lamps -are mounted ,prominently upon the frames supporting the switchesand in such manner `that an attendant seated in a supervising position may see from the one view point all the lamps of a central ofiice or of his portion of a central office. In connection with this plan, my system of lamp signals is such that the attendant by watching the lamp signals may know to a very considerable degree the progress made by any call which is received by the central office apparatus. I provide three lamps and a normal call normally handled by the central oiiice apparatus will produce illuminations of these lamps, or two of` them, in a predetermined order and of predetermined durations which may be recognized visually by'the attendant as indicating a connective division and a telephone user`both acting in a normal manner. i

While a call terminating upon a line pre viously engaged (the call therefore being defeated because of the guard or busy-test nais produced condition upon the called line) may be corisidered in some ways as a normal call, I provide such details in iny system of4 lamp signals and circuits thatthe sequence of sigwhen calling an engaged line is difi'ei'ent'from the sequence of signals produced when calling an idle line. By this detail of improvement, an attendant Watch ing the lamps of a distant olierating division, may know whether the call is terminated upon an idle or a busy selected line..

I provide also a signal which is displayed when the subscriber upon the B-liue of the" connection lifts his receiver before the lifting of the. receiver' upon the A-line.. This is a condition having a peculiar interest in an automatic exchange auf the charactei herein described. My improved signal for this condition also has a peculiar interest in that for the disjilay of this signal. I cause to glow simultaneously two lamps, neither of which indicates when glowing alone any part of the condition ini'licatcd when both glow sinui'ltaneously.

Two lamps are provided to indicate normal operation of switches and a 'third lamp is provided as an alarm lamp iiidicatiiner an abnormal' delay in the operation ofthe switches whether upon the part of central office devices or npou't'ho users. f

(M) ,For Athe detection of automatic switches operating ab'nornnilly. l provide. a timing device which is the equivalent of a slowly actingr relay. the device beingrr so adjustedfthat itI will become operative as soon as an automatic switch becomes inoperative and that. itivillf become opera-tive."when the automatic switch reaches its normalgposi tion or any predetermined position. rl`.he relay contacts may be connected in an alarm circuit or inV a circuit to restore the automatic. Switch to normal or both. 'l`heyspced oi operation o' the slow relay or timiiii;Y device then may be adjusted to give the automatic switch sutlicient interval to operate in norlnal'm'ai'iner before the timing device closes its contact poi-nts. ily meansofsuch a device` an automatic s wilch ma)v lue brought to the attention of au attluulaut thro'i'igli the `alarm when the. switch is not inieriritingin normal niiannerfor at normal speed; or, on the. other hand. nu Vautouiaticlswitch may be caused always to return 'to normal in readiness For i'urt'heii service. in case it has not operated in Vnormal ma'nuer and witliilra preiloteria-ined time limit.4

(N) l-eomhiie. in. .oney devi-cethe finir-.tions of an alarm timer an'd la.,i'eleastat'iliiei'.

I |-n-ovi'de.; in iiiy in-i'proved timer, two pairs of electrical contact springs, and I provide a moving striker driven. 'stepby step toward the springs. I so place the sl'iringswith reierence to Vthe Striker that the striker en- .A gages end ol'oses the first pair of` springs part o'i telephone Vabnormal switches 4single bus wire. through `switch (Fig, l pr comprising four movable Contact poi-nts orupon a predeteri'uined step, and lso place the second pair ai' springs that upon the next succeeding or some predetermined succeeding step, the striker will engage and close the Asecoi'id iair of springs either di rectly or by movinplr the first pair of' springs or contact inen'iburs to engage the second pain* I thus cause mj' in'iproved timer -to close two circuits. each having a prialeterininet'l delay after the beg inning of operationof the timer, one circuit having a ,greater delay than the other it t esire-d. lt is obvious that both circuits may be closed simultaneamsly if desired as an alternative method,.of'o'f eration.

lly means of the delay ot the second closingrr after the first7 I alu enabled so t0 c01inect my timer contict points, that an almorinal act-ion of indicated by an al: rm` and later is relieved automatically by re .-toration ol the switch. "r

may provide ai. automatic release and cause an alarm latei` i the automatic release has not been el'ecti ce.

(P) When an au onnitic exchangev is fully Supervised, as in tile busy hours oi the day1 it may be desired -tliate\er v case of abnornial action be studied by the attendant and that no automatic releasing be permitted, a'll bei ng released and restoized manually by the attendant; in such :vease it is desirable Vthat the automat-ic release circuits ot the timers be disabled. )Viren the automati( exchange unattended as atnig'ht and on holidays, the alarm circuits associated witl' anto-matic. releasing de.- vices h'are no practical value andinay be. disabled, lea vingr the normalingroi` the automatic switches wlully to the care ,of the timcr-controlled releasing1 circuits. 4It is obvious` limvei'er. tlt at the e.\'eliaii,fl'e should not be left at any time without eitheralarm or release circuits operative.

l provide in connection with my improved lamp-aiid-releasea switch having' two posi tions. in one position disabling the-'releasing circuits of the entire Ve.\'c-liange` inV the other position disabling;r the lamp-alarm circuits of the entire exchange. lI )rovide sul'i circuits for tli'e alarm that they may be cloni nected to a single. luis wi-i'e thronrh 'thenight switch. ,ln liliei main er I provide such a cii'-, cuit for the release c rcuits of all the timer devices thatthey nilvv be collected uporia the night switch.

' (Q) Tlpon the i1-ith level of thepilot )vide a. multiple brush brush fingers resting upon foiir of the fixed contact points of the level. These brushes in their progress cmnect together four points at all times, the. termined at any brushes'since all four rest an mtomatic. switch is first ou'r1 points bein detime by thegpi'isitionor lthe.

ica

Images