US1438736A - williams - Google Patents

Description

S. B. WILLIAMS, la.

TELEPHONE SYSTEM.

APPLICATION mu) JAN. :5. :920.

1,438,736. Patented 12%. 12,1922.

fly. 2 $HEETS-SHEH 1.

//7 1 enfor: Samue/B. wfl/famj. J7.

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Patented Dec. 12, 1922.

.4 UNITED STATES RAT EN'T OFFICE "SAMUEL D. WILLIAMS, JR., 0]? BROOKLYN, NEW YOIFK. ASSIGNOR TO WESTERN ELECTRIC COMPANY, DICOBPORATED, OF-NEW -YORK, N. Y-, A CORPORATION OF NEW' YORK.

, Tmrnoms sY ST'EIL:

Application filer! January 19.1 5205 Serial 11013 13 5; j

To all-w homitm dy concern:

,b'eit lmown'thatjl, S: tori. B. WnLLuMB, J r n citizeirrofiithev United States, residing at Brooklyn county of Kings, State jof blew prk, .l |e .,v e, invented certain new and usefuliimprovements. in Telephone Systems, of ,whichgthe-follo wing is a full, clear, coa rise. and exact description. f

This invention relates to telephone systerns and more-particularly to automatic switches .forinterconnecting lines in such systems.

It is the object oi'this invention to pro- -."ide-n switch of simple structure nnd posi- Live opnration which may be moved in a single 4 direction i to connect; one -teieph'one line with either-o yeiticulaniine or with an idle one of a group of lines. o

Referri'ng-tp-.the drawings,'. Figs; 1, 2 and iftiivith 'Fig. 1 to the-ri ht of Figs. .2 and 3 show; p,;"telephqne;, svs m embodying the presentiinvention. ig. llshorgcs olperspectivendewofga switch embodyin thisinventicn together \vithi-e diagram o eircuits for the. switch, and a. snbscribers sulstction; '-ig.-2,shows an incomin trunk line. with one end oiu. cord circuit or connection therewith; ,end Fig. 3 shows an out- 'cin 1't111 nklinewith one end of the cord circuitforconnectiontherewith. The nipmentshownto the rightmf the dotted ines in Figs 2 and dis-preferably located in the some 'oflice as that shown .in Fig. Ijand that shown-.to-the left of the,dotted lines may lie-locatedat a central office. 'Inthe presentfembodiment of the invention. a sw tch such as is-disclosed in Fig. 1 provided idividual to each vsubscribers lineus' well as each incoming-trunk line. The switch comprises'frameipiecesl .and 2, thejends of which are slotted to receive a blur-3 slidableiherein. A rod 4secured to the frame in any suitable manner rotatably snpportsa number of contact opera.

', arms 5, which are provided at one end wit ears 6 to receive thcrod 4, and at the other rngl with wins 7. car. "ng rollers 8; Secured to the rod dare coi sprinFs 9 which keep the rollers}! in contact wit the upper surfew of the bar. 3. in am (his provided for-each snbscribe1"s.1ine,and for'each outgoing line-to which the switch has nccessin .addition to which there are" proshown at the right of \ided twofarmsfi Fi 1 for u, purpose to be later described.

Secured in any suitable mennertoithe bottom of eech aunt, 'which-fis individual to an ontgo|ng t1nnl.line;:-i insert: in's'u latmg mater al 10 in which lie1d sprin 11, 2; 13 and 14, thejreslr ends p-o fiwhic are adapted 'to be 'used'for solderingfterminals. .The-front endsof these-sprmg s a re nd usted to-normally restgabove line hers, 15, 16, 17, and 18 which are rigidly secured tothe frame and insulated therefrom in suitable manner. Similzirljr each arm 5 in d vidual to a line within thetlomhoflicecarmes springs 12, 13 and 14 'whichcooperate wlt-h bars 16 17 and 18 respectively: 1

The bar 3 isprovide'd withHnoteheS-IQ and a cam surface 20 ar spsoed so that movement ofv the baritbtheri {from normal positionwwill 11 ow 5 1 1s..,. -;w sue oess vely. ride 7 into th'e'xnotchesi lii';Ithereby hringig springs 11,12,13 endjfifinto engager nent with hars .l5,: 16, .17; nnd 1.8.r e speeuvely. The betwenisuceessive notches 19 is consequently. made "greeter than the. distance between: successive arms 5 by an amount equalfto the length ofone ormore teeth of .the ratchet 21. ecnredtp theofm ne member 2 is 28 eannyln' anhrmatnro kvf-Qistbfiehd of which ispivotallymountedfn 'pawl I hc pawl .25iis held in engagement with is 111120, Afixedto the frame, byln; spring 27 and 1s: arranged so that whenlhemrmatu're 241s 111 normal osition,.the pawl 25flis clearpf bar- 3; i ,armatureuihi is'Jittmcted, pawl 25 engzgm. one ofi'thete'eth 21 whlch are cut on; elowersidelof so 3 and moves the bar 3 to tile-right. Secured to fremel by .a screw 28! is aresetting or releasing ma net'29, provided with-an annature,-.30.,piv ed to one end. of fwhichis a pawl 31, 'Pawl..31 is held in en' gement with a-pin 82, which is seeuredto t e'frame, bye spring' 33 .so that when arm aturefifi is .retraeted. pawl 31 is clear of. the teethr 2 2 dinner-inte ration the i (ii conductor 66 through the winding of thc'stc ppiuor magnet '22 to grounded battery. Mngnet l3 and relay 65 .im energized in this circuit, magnet, '23 attracting its armature -24, thereby-causing bar 3 to move one step to the right so tha the roller Set the first line am s inhits notch 19. and roller 8 or the off-normal arm Oh' is raised from its notch lD'to the upper surface of bar 3, to operate the off-normal springs to 58 in the manner previously described. Spring 53 in breaking contact with spring 54 and making contact with spring 52 removes the dialing tone from the calling line and provides substitute circuit for stepping relay 59. Upon the second and succeeding retractions of the nim'nture of relay 59 a circuit is completed from ground, arm nturenn'cl back contact of may 59, inner right-hand armature and front Contact of relay G3 righthand armature and front contact of relay 65, through the winding of relay 65, conductor 66, thi"ough the winding of the stepping magnet 23'to grounded battery, thus main dining relay energized and causing the magnet 23 to step bar 3 to the right, sucrcss'lrelv dropping each roller 8 into its netchl!) and returning it to the upper surface other 3 until the roller 8 of the desired line which will be assumed to be the line 5. R, Tfl'drops into its notch 19. Upon the fi'rst'deenerg izntion of line relay 59, a circuit wus'also completed in parallel with that traced irom ground, armature and back contact of relay '59, inner right-hand armature :md front contact of relay 63, right-hand armature and back contact of relay 65, springs 56 and 55. through the winding of relay 6? to'grounclerl battery. Relay 6'! was energized in this circuit and locked up over a circuit extending from battery, through the inding. front contact and armature of relnyfii, the armature and back contact of relay 68, and the'front contact and outer right-hand armature or relay 63 to round. it the called line is busv, ground put ential' will he found on its cont uctor S, bein}: supplied thereto through the left-hand armature o-E itsnelav 63 if the line is busy as n calling'lingan in a manner be be described if" the 'line' is busv as a celled line. Thisground will beex-tenderlover spring 12. bar 1 6, conductor 69 left-hand armature and sriri'zigTOof relay G5, and through the Winding oftcst relay T1 of the calling line to grounded battery. 'Relny 71 will he enei L'zed hithis Circuitand upon the de'energiwhen of relaw' 65, due to the cessation of impulses from thwliuc rcla v,-a locking circuit will he completetlor relay 71 from battery, through the winding of relay 71, spring and its normal contact. front contact and right hanll' armature of relay Tl. conductor 72 front contact and outer right-hand armalureol rcluy 63 to ground. A busy tone will thisicircuit is a aui Blc'utting 06 the then be transmitted to the calling subscriber from ground, through the left-hand winding of the transformer Z, front-contact and inner left-hand armature of relay 71, back contact and inner armature of relay 61, through the apparatus at substation A, outer armature and back contact of relay 61, winding of relay 59 and impedance coil 62 to grounded battery. The calling subscriber hearing this tone will replace his'receiver on its hook, thereby interrupting the circuit for line relay '59. Relay 59, in deener izing, opens the circuit for relay 63 which eenergizes to complete a circuit from ground, armature and back contact of relay 59, inner right-hand armature and back contact of relay 63,-springs '57 and 58 closed while the switch is away from normal position, springs 37- and 35, through the winding of the release-magnet 29 to grounded battery. Magnet 29 is energized in this circuit and in attractingits armature 30-forces pawl 31 into engagement with a tooth 22 to move the bar 3 to 'the left and opens the contact between springs 35 and 37' to interrupt its own circuit, thereby.causing its cleenergiza tion. Upon' each retraction of armature 30, completed by the closure of springs -35 and 37 so that magnet 29 continues to move the bar 3-until it reaches its norinalposition, at which-time roller 8 of the arin ON in dropping into it's notch 19 permanently interrupts the release magnet circuit by opening the contacts between springs 57 and 58. Relay 63, in retracting its outer right-hand-armature, interrupte the lockingcircuits ofrelaysfi? and 71' and the-switch'iscompletel ,restored.

": Ifthecalled'line is ound idle, battery potential' will be presenton. its conductor S, p

being supplied thereto from grounded battery, through the winding of cutr'ofi relay 61 ofthe called line, back contact and left-hand armature of relay 63 of the called line to its conductor S, and a circuit will be completed through conductor S spring 12, bar 16, conductor 69,-left-han contact of relay'65, through the left-hand winding of relay 73, back contact and righ hanrl' armature of relay 71,i conductor 72, through the front contactand outer righthand armature of relay 63 toground. Bela 6 of the called line and relay 73 of the cal in line are energize in'this circuit, relay line relay of the calle line. Relay 73, in attracting its inner right immatures, completes a-circuit for ringin the called subscribers bell from ground battery, through the secondary windin of transformer, throu h the winding 0? relay 680i the calling lln8,"f10flt contact and left-hand armature of relay 67, front contact and middle ri lit-hand armatute of relay 73, springs 471m 40, bar 17, spring 13, conduc tor 11 conductor R of the' called line,

armature and back.

through the apparatus at the called substation, conductor '1 of the called line, conductor T", spring 14, bar 13, springs 39 and 45. innermost right-hand armature and front contact of relay 73, through the impedance coil and springs 53 and 52 to ground. A by-path circuit for ringing current is also provided through the contacts of the inner right armatures of relay 73 and the resist ance 81 to the a paratus of the calling substation to provi e ringin tone to notify the calling subscriber that t e called station is being signalled. The resistance 81 is of such a value that the ringing current traversing the calling subscribers circuit is suflicient to be heard, but .not suliicient to be annoying, nor is it sufiicient to cause the energization of relay 68. Resistance 81, being of the noninductive typefas indicated, forms a shunt around relay 59 when the talking circuit is completed-so that the transmission of talkingcurrent is not affected by the inductive win not relay 59. The bell at the called station is rung in the circuit above described but rela 68 is marginal and will not energhize unt the called subscriber answers. At is tim relay 68 is energized to interrupt the locking circuit previously traced for relay 67 and relay 67 in retracting its lefthand armature cuts 05 the ringing current. The callin and called substations are now connectedor conversational purposes over the circuit shown in 'heavy black conductors in Fig. 1, batte being supplied to both calling and calls lines through impedance coils 60 and 62, and relay 59 being held energizedover. the loo of the calling subscribers substation. the-conclusion of the conversation, :when both subscribers have relaiced their-receivers on their hooks, the circuit for relay 59 is interrupted to deenerize this-relay. ,Release of the connection and restoration of the switch to normal now takes place in exactly the same manner as was described when the calling subscriber abandoned thaconnection upon finding the called line busy. 4

. If the subscriber at station A'desires a central ofiice connection, he operates his calling device 64 to-sentl a greater number oi impulses than 181:8 required to operate his switch to connect him with any'cther subscribers line in the. branch exchange, thus relays 59,63, 65 and 67 are operated in the d same manner as was described for a connec tion within the branch exchange, but thrright step ing magnet 28 moves bar 3 to the until the arm TK is raised to operate springs- 39 to 49 by the engagement of roller 8 with cum surface 20 of bar 3. Simultaneously, with the operation of these springs. the arm 5. shown at the extreme left of Fig. 1, drop into its notch 19, thereby completing cm:- tnct between springs 11. 12, 13 and 14 and bars 15, 16, 17 and 18 respectively. If this trunk is busy. ground potential will he iound on its conductor 75 being supplied thereto over a circuit which may be traced firnn ground through the outer right-hand iii-muture and front contact of relay (S3 of the line. with which this trunk line is already occupied-conductor T2 of said line, inner left hand armature and front contact of relay T3, buck contact and left-hand armature of relay 65, conductor 69, bar 16, spring 12 and conductor 76 of the trunk line. This ground will tie-extended through spring 12 and bu:- iii of the switch of the calling line, conductor 69, leit=lu1nd nrmnture and contact spring 70, of relay 65 through the winding of relay 7'1'to grounded battery. Relay 71 is energized in this circuit and locked up over the same locking circuit which was traced for this relay when it was energized on account of the busy condition of a calling line with in the branch exchange. In attrecting its outer left-hand armature, relay Tl completes a. circuit from grou'nd, outer 'lefbhnnd armature and front contact of relay 't lgspringu 48 and 41, springs 36 and 34 of stepping magnet 23, conductorfil. right-hand nrmziture and front'contact of relay (35,through the winding of relay 65; conductor 66. through the winding of stepping magnet :23 to grounded battery. Magnet 2-3 steps the bnrB one step to the right so as to connect the-springs of the next trunk line with the burs 15. 16. 17nnd 18015 the calling line. In case this line is also busy, the previously traced circuit for test relay 71 will be again completed and magnet 93 will he again energized. Thus magnet 23 will stop the bar 3 to the right-until thesprings of-an idle trunk-line engage the line bars or the calling line, at which time, no circuit being completed for test relay 71, this relay will retract its rirmatures to open the circuit for magnet-'23. As relay 65 is included in this circuit. it will now be deenergizecl and a circuit will be completed from ground, outer right-hand armature and front contact of relay 63, conductor 72, rightf'hnnd armature rind lmck contact of relay 71. through the left-hand winding of relay 73 back contact and left-hand armature of reln 65-, conduetor 69, bar 16. spring 12, con uctor 76, through the winding of relay 300 to grounded buttery. Relays 73 and 300 are enerflized in this circuit, relay 73 in attracting: its outer left-hand armature completing a locking circuit for itself hich may be traced from ground outer rightrhnnd arninture and front contact of relay 63. conductor 72 outer left-hand armature and front contact of relay 73. through the right-hand winding of said relay to grounded bet ten. and in parallel with this circuit. extending around to the conductor 76 of the trunk line taken for use from the inner-left han'd armature and front contact of rclny 73 end the circuit previously traced. Upon the cnergizniion of relays 300 and T3, :1 circuit is completed for cut-0ft relay 6-1 of the culling line which may be traced from grounded buttery,.through the winding of relay U1. springs 42 and 49, outermost rightltnnd armature und front contact of relay i3. and conductor 79, through the front colitut-t and armature of relay 300 to ground. Rein (Si in attracting its armatures cornple'tes a circuit for linerelny 301 of'the trunk which may be traced from grounded buttery. through the left-hand winding of relay 301; back contact and inner right-hand armature of relay 30-3, conductor 7?, spring l3, her 1 springs 40 and 46, front contact and outer nrmatureof relay 61, through the up priratns ut substation A, inner armature-and front contact of relay (51, springs M and 39. bar 18, spring lat-conductor TS cuter right-- lizind urinnthrehand' back-contact of relay 302. through the right-hand winding of relay 301 to ground. Reilly 301 ill-attracting its inner armature, completes an obvious'circuit'ior relay 303 whichis ener 'zed and completes a circuitirom ground; ron'tv con tnct and armature of -relay 303 conductor springll, bar-15, through the winding of :elziy (S3 to rounded buttery.- Relay 63 is held energize in this-circuit during the remainder of the connection afterarelay 59 is doc nbrgizcd due to-the operation of relay 61;. In attracting its 'outer armature, relay 301 extends ground through-the outer armature and spring 304- of relay '301 and. the buck contact and left-himdurmature-lof relay 302. through the-winding cfsup'ei'visory rcluy 306 to bhe-ringcontact-spring of jack 1 .07. A circuit also oomplebedr'irom ground. outer armature and spring:- 3650f inlay i301. through the armature'nnd-oontact of sleeve relay 308 and the winding of relay 309 to grounded battery. Relay 309 is energized in this circuit and. iriattracting its armature. completes a-cii'cuit to light the line himn 310. The operator, observing this light, inserts plug 311' ofnnidlc cord circuit in answering jack-307; thereby completing a circuitfrom grounded buttery. through the-lower right-hand windingmf repeating-001F312, through the winding of supervisory relay 313. ring contacls-of'plug 311 and jack 307 over the=circuit traced for supervisory relay 306 to around at the outer'a'rmature of relay 301. Relays 313 and 306 are energized-in this circuit. #Suprvisory relay 31-3, in attracting its armature, rovides'a shunt circuit for lamp- 314. extinguishing this lamp which was lighted over a. circuit from'betterry. through-lamp 314, sleeve contacts of plu 311 and jack 307, undeleeve relay 308 to ground upon the insertion 'of the plug in the jnck. Relay 308. in rittraciingits-nn'nature, interrupted the circuit 01' relay 309 to extinguish lamp 3101"Re'lay 306, in attracting its inner armature, completes an obvious circuit for relay 303'to hold this relay energized upon the deenergization of relay 301.

5 In attracting its'outer armaturey-relay 30G completes" an obvionscircuit for relay Relay 302 in attracting its ;right '-hand arma tures interrupts'tl'i'e circuit of relay 301' and coiripletes 'a' circu'it' from" the 5 central office cord circuit to the. 'cauiiig substation which conductor 7 8,"sp'riiig 14, bar '18," spri'ngs 39 and 4:4, "fr'o"tfcont a'ct"and inner armaturc ofrelay" '1"; hi biigli-theapparatus at substation -!i',jouter armature and from; contact of relay 61, springaeand 40.!sar 17, spring and front contact of relay 302], through the winding b f s'upervisory 'relay'306jring con.- tacts of. jack ,30Land, plug .311, th rough-the winding 'of supervisory relay 313 and the lower right-hand winding of repeating coil 312 to battery. Relays 313 and 306 are held energized in this circuit and the operator, by depressing her listening key 315. will con 'nect her head set, not shown, to the line and may inquire the desired number and com plete the connection to the called subscriber in any well-known manner. IVhen the subscriber at station A replaces his receiver on its book at the end of the conversation, he

85 interrupts the circuit traced for relays 313 and 306 to deenergize these relays. Relay 313, in deenergizing, removes the shunt around the lamp 314 to light this lamp and the operator thereupon removes the plug 40 311 from jack 307. Relay 306. in retracting:

its armatures, deenergizes relays 302 and 303. Relay 303, in retracting: its armature, interrupts the circuit previously traced for relay 63 of the calling line and the consequent deenergization of this relay causes re- 'lease of all the apparatus at the branch exchange in the manner described for the release of a connection between two substations within the branch exchange. Relay 73,

in deenergizing. interrupts the circuit for relay 300 and the system is coiupletel restored.

The central office operator. desiring connection with a substation in the branch exchange shown in Fig. 1, after making the usual busy test with plug 200 and jack 20]. on finding the line idle, inserts the plug 200 in the jack 201 and depresses her dialing key 202. In inserting; the plug into the jack, a

circuit was completed from battery, through the winding of relay 203. sleeve contacts of plug 200 and jack 201, through a resistance, to ground, to energize relay 203. In depressing her dialing key, the operator completes a circuit for line relay 59 of the trunk line which may be traced from grounded battery. through impedance 62, winding of relay 59. hack contact and outer armature of relay 6i, conductor'204. ring contacts n jar-K 201 8112: plug 200 lower alternate contact of dialing key 202. through the normally closed springs of the operators calling device 205, upper alternate contact. oi 'key'202. contact and armature of relay 203, tip contacts of plug 200 and jack 201'. conductor 206, inner armature and back contact of relay 61. through impedance 60 springs 53 and 54 and second ary winding of tone source to ground. t'elay 59 is energized in this circuit. thereby "causing the energization of relay 63 in the samcmanner as was described for the-case fwlien alsubsc-riber at" the hra'ncli 'eschangc 'initiatedfa' call. The operator now dials the f'number of the wanted. subscriber. thereby i'nterru'ptingat the springs of the call ng device";205 the'circuit traced for relay 59.

' After' the operator has dialed this number.

she-releasesher key"202 thereby completing a substitute circuit from the normal contacts of key 202 and the right-hand windings of repeating coil 207 instead of through the alternate contacts of key 202 and the calling device 205 to maintain relay 59 energized. Since the operation of the switch at the branch exchange is exactly the same as was described in connection with a call between branch exchange subscribers, it will not be further described at this time. In case the called line is busy. the operator by depressing her listening key 208 will receive a busy tone and, after informing the calling subscriber, may remove the plug 200 from iack 201, thereby interrupting the circuit of relay 59 and causing the release of the apparatus at the branch exchange in a manner previously described. In case the called line is idle. the operator will he informed of the termination of the conversation by the lighting of the supervisory lamp associated with the answering end of the cord circuit (not shown) and will thereafter disconnect.

What is claimed is:

1. In a telephone system, an incoming line terminating in a set of multiple contacts. a number of outgoing lines, a contact operating member individual to each of said outgoing lines, a movable bar. means for imparting longitudinal motion to said bar. and mechanical means for successively actuating said contact operating members to interconnect said incoming line with said outgoing lines upon movement of said bar.

2. In a telephone system. an incoming line terminating in fixed bars, a movable bar parallel to said fixed bars, a number of transverse arms resting on said movable bar, a number of outgoing lines terminating in contacts carried by said arms. and means controlled over said incoming line for advancing said movable bar to selectively operate said arms to interconnect said incoming line to one of said outgoing lines.

3. In an automatic switch, a number of contact operating members, a movable bur, means for impartin longitudinal motion to said bar, and mechanical means for successively actuating said contact operating members upon movement of said bar.

4. In an automatic switch, a number of line bars, a number of arms, contacts carried on said arms to cooperate with said linc bars; a movable bar to mechanically control the movement of said arms, and means for moving said bar to selectively operate said contacts.

5. In an automatic switch, a number of pivoted arms, contacts individual t0 said arms operated by movement thereof, a notched bar upon which said armsrest, and means for moving said bar to successively move said arms into engagement with said notches to operate their associated contacts.

6. In an automatic switch, a longitudinally movable ban, ratchet teeth on one am face of one bar, a number of pivoted arms resting on the opposite surface of said ba r, a notch cut in said bar individual to each pivoted arm, the distance between successive notches being greater than the distance 9 between successive arms by an amount equal to the length of a number of said ratchet teeth, a pawl to cooperate with said ratchet teeth to move said bar to successively engage; said arms with their notches, and con tacts operated by the engagement of each arm with its notch.

7. In an automatic switch, a number oi pivoted arms, a bar on which said arms rest, notches and a cam surface on said in bar to successively rotate said arms durin the .-advancement of said bar, contacts 5; divridual to said arms. operated by rotation thereof, and means for advancing. said bar.

Inwitness whereof I hereunto subscribe 4.3

my. name this 13th day of January A. D.

SAMU L B, WILLIA S, J R.

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