US1075258A - Telephony. - Google Patents

Description

M. L. JOHNSON.

TELEPHONY. APPLIOATIOH FILED D110. 4, 1912.

Patented 0 0m, 1913.

3 SHBETS-SHEET l.

ENTQR MORTON LJ JOHNSON HY ATT @RNEY Patented 0013.7,1913.

3 SHEETS-SHEE'1' 2.

I NTGR MORTON L. JOHNSON ATTQRNEY M. L. JOHNSON.

TELEPHONY.

APPLICATION FILED no.4, 1912 Patented Oct. 7, 1913.

3 SHEETSSHEBT 3.

RH mm mm M.

WITNESSES ATTQRNEY Worm .llilfl .ll.

ICAGQ, XLLlll-UIS, T COBWIN TELEPHONE MAN- j-Lhl iii, C 1 CH'JICAGG, ILLINOIS, A COEPGRATION OF ILLINOIS.

TELEPHONE fif'b all whomii only concern:

3 it known that I. lllou'rcw ll. JOHNSON? 'n ol' tho United litiiics, reciding otxg'o, in ihc coonly of Cook and State. of lllinois, hiivo invented a certain now and l lnmrovchienl; in 'i clophony, of which dOllOll lllg is a full, clcmr ooncisc and doscriplion, roil ercncc being had to tho :1 cfil'l'ipz drawings, forming a purl; of

on. i

LClOll relnlcs to those telephone loi'ns inciudi aolcphonc lincs extending our SlllllE-lCllbQl'bl stations; to an exchange a; sonic oi? which stations arc l=1,:cz1l; d doviccs inquiring operation by call.- ing' ibors icnscs by called subsoi'ibcrrs in order to complete connection belwcv calling and callod Subscribers, thci'o bcing moons at l'ho subscribors stations coopen with those devices and ogcroblc by r: :o-zmding coll. d subscribers, link conn li-C-L'l-Ol'tl al the exchange, for conversation, switching mocha]. n for brculiio lclophonic connection boom-con cull.-

y llcd stallions for telephonic cnrroot ii'u'orcsscd upon calling lines 21'". culling uniting" linos in inlioololls electromagnetic mechanism govv 1 Qinod l by tho aforesaid devices oi caning Stiloquippcd lihcrewith in. cooocrnlion "l2 alfiorcsaid means ill sl-Ldions oi rcfor opcral'ing swii'ching mechanism to complete conlion holiwe'cn calling and called stations, moans for completing telephonic con- ,tion bclzwccn calling and called stal ions iior iclcyhonic current impressed upon callcd lines at called stations when lclophonic connection brolicn between culling and called Milli-i015 for currcnl impressed upon culling lines at culling slot-ions.

In my copcnding appliculioi'i Serial No. l 86%; lilod December l, 1912- l have illuslrnlod' oporzilor controlled means for com biing the completion of coi'incc'tious bclwccn coiling and called siiilions so as not to roquirc operation by calling culmoribcrs of tho dcvicce lociiied at sl'ulions employed for i'hc mrposo of charging calling subscribers wilh connections.

in my present inicntion I employ moans whorcby calling si.ib:5o1'ibcrs may signal an :Wernlor whoso function ii. is lo 9155 upon propricby of por nilling guch calling subiber to have free conneolion. in tho broil-rived cinhodimcnt of tho immr .Specificaiion of Letters lalent.

Poizcntod om, Tl, i913.

Serial No. Win 5.

tion link connectors are employed which the coiling SlllJSCllbGlS are enabled to use for. establishing connection between calling and called slalions and which are provided with equipment, controlled by calling and called stations, for the purposo of preventing coniplctc connections between calling and called stations until offer the calling party has operated the device at his station that will charge 5 ich calling party with tho conneclion to be effected. This cquipmcnl is sup pleinonl'cd by means also governed by the calling subscriber whereby his line may be mitoinziticolly oxlcndcd into connection with the operator provided for the purpose stated.

I will cxplain my invonlion more -fully by rcforoncc to the accompanying drawings in which l igurcs l, 2 and 3, taken collectively, with the. conductors terminating at the right, hand end of Fig. 1 in alinemcnt Wilh lhc conduciors lorminiicing at the left hand side of Fig. 2 and the conductors terminating at the right hand sidc of Fig. 2 in zilincincnt with lhc conductors terminating at the left hand .sidc of l ig. 3, illustrzitc tho preferred form of telephone cxchzingc system employing nutonhitic means for extending culling lines, tho particular oystcm illustrated being one in which the extensions applied to calling lines are also uulomatioally connected with called lines though the invention is not to be limited to systems employing this latter step.

The prepayment of prochnrgc station A, of which there are of course w number, and lho culled slnli-zwn ll which may or may not be a prepayment or n'cchru'ggo slulion, nro illusl'rntcd as being caoh provided with tho usual telephone equipment including a tolc phone rcrciver switch hook 1 having a nor-- lllill contact for connccl'ing the line sides through a signal bell. 2 and a condenser 23 when the tclcphono receiver 4% upon ils rawilch hoolc. The switch book has an alter- 11;z'i19 Contact whereby the ielcphonc receiver 4 and telephone transmitter 5 are includcd norms the line sides when tho telephone rccciver is removed from its switch hook. isc-inning that the party at station A is 1111- tuiting a. call, lihc receiver 4- at the calling station A is rec of its switch hook to permit said switch hook metalhcally to connect the ilidfis of the calling" line whereby circuit 1s:

established through the selector switch line relay (3 by circuit connections which are apparent. Calling subscriber, after having removed his telephone receiver from its s\\'itch hook, operates his dial mechanism, which is illustrated in diagraannatic form, the normally closed circuit interrupting switch 7 whereby a circuit of the magnet (3 is intermittently opened for the purpose of causing its armature switch to be vibrated at a predetermined rate of speed. \Vhen this armature switch is attracted it establishes a circuit through the sluggishly operating re lay S. hen the armature oi relay 6 drops back (the armature of relay 8 still being up, owing to the sluggishness of this relay) a circuit is established traceable from the grounded armature switch of relay 6 through its normal contact, the lower armature switch of relay 8 and its alternate contact, the vertical magnet- 9, the sluggishly operating relay 10, the side switch wiper 11 in its normal position, to the grounded battery 12. The vertical magnet raises the wipers 13, 1. 1 and 15 to the level of a bank of waiting contacts that includes waiting contacts pertainingto a desired link connector which is to be automatically connected with the calling line for the purpose of extending the calling line into connection with a called line. When the desired level of waiting contacts has been attained, the circuit of the private magnet 16, which was closed upon the energization of relay 10 at the armature switch of this relay, is opened due to the maintained attraction of the armature switch of relay 6, and the circuitof the vertical magnet 9 is also opened at said armature switch of relay 6. The vertical magnet 9 therefore ceases to elevate the wipers 13, 1.4, 15 while the private magnet- 16 serves to step the side switch wipers 11 and 17 to their second positions. When the side switch wiper 11 is put in its second position circuit for the rotary magnet 18 is closed through the interrupter 19 whereby the wipers 13, 14C and 15 are stepped around until the wiper 1e engages an ungrounded contact. When this ungrounde'd contact is encountered circuit for the private magnet 16, which was again closed upon the initial operation. of the rotary magnet 18, is opened whereby the side switch wipers 11 and 17 are moved to their final position, the side switch wiper 11 in being moved to this final position opening the circuit of the rotary magnet 18 whereby the wipers 13, l t and 15 are brought to rest with the wipers l3 and 15 in connection with the talking sides of the automatically selected. link connector that is to constitute the extension of the calling line. I

It is understood that there are a. plurality of the link selector switches being described for a group of telephone lines and that the engaged by wipers of these switches are provided with waiting contacts that are individual to the link connectors, each link connector having n ailing contacts in the different switches and which are similarly positioned, tne similarly positioned waiting contacts being in multiple connection. When the wiper 17 has been brought to its final position it connects the wiper 14 with ground by way oi the upper armature switch of the sluggishly operating relay 8, this ground being substituted for another ground which will later appear. in this way the contact the actuated wiper 14 is grounded and similarly positioned contacts in other switches of the same group are also grounded owing to their multiple relation with the aforesaid waiting contact so that other switches cannot select the link connectm' selected by the switch under de seription. When the side switch wiper 11 is in its third position a circuit is established for the switchingrelay 20 which may be traced from the grounded battery 12, the wiper 11 in its final position, the relay 20, the upper armature switch of relay 8 and its contact to ground, this ground later being replaced by another ground as w ll later appear. The relay 20, now being energized, connects the wipers 13 and 15 with the sides of the calling line so that these calling line sides are extended into connection with the talking sides of the selected link connector. At the right hand end of Fig. l the wipers 13, 14- and 15 are indicated in dotted lines. These are the same wipers which are shown in full lines just to the left and are thus illustrated for the purpose of showing these-wipers in another level. The level. illustrated in connection with the wipers 13, 1.4 and 15 where shown by dotted lines is one of a number of levels that are used in ordinary automatic or semi-automatic practice. The level shown in connection with the wipers 13,14 and 15 is an especially provided level for one of the purposes of the invention andis employed to enable call ing subscribers to become connected with called subscribers without having to operate any prepayment or precharge device.

It will be first assumed that the calling subscriber is' not making an emergency call but desires to secure connection with a called subscriber as usual. In such event the wipers 13, 14 and 15 will be brought to some level in which are provided waiting contacts that, in. the embodiment of the invention illustrated, constitute terminals of an idle link connector extending to a connector switch illustrated at C, under the assumption that the system is an automatic system, the connector-switch C being operated by the callingsubscribers circuit interrupter 7 in the establishment of connection between calling and called subscribers for bringing ornets the connector switch into assethecclled line, the operation fell known b sf illed in the art is description thereof will not be furnished but reference may be had to Eritish Patent 1298 ltlltl and to an Derenters Telephonai- 09y, 53G, on understanding of such connector switches. I

l hen the wipers 18', i l. and have been brought to rest circuit is established which is traceable from the grounded battery 12, the upper windin oi" the relay i'ilfthe upand its alternate contact, the upper armature switch oi relay 23 and its nornial contact the circuit interinpter 7' at the calling ststions the telephone bridge .at the calling station, the lower armature switch of relay 23 and its normal contact, the intermediate armature switch of relay 20 and its alternate cinittuzt the Wiper and the contact engaged thereby, the lower winding oi d'iii erei. al magnet 22, the lower winding of magnet Q1, to ground.

if'il ts its armature switches, the upper ariiosture switch or this relay closing circuit for the siuggishly operating relay 1% whereby the uppermost armature switch of the sluggishly operating relay pieces ground upon the contact engaged oy the wiper 14: in lieu of the ground now removed at the unper armature switch of sluggishly operrting relay 0 consequent upon the operation it the relay 20. The lower armature switch of relay 21 establishes a bridge connection between the talking sides or" the link connector extending to connector switch G, which bride's connection may be traced from the lower talking side oi the link connector,

a until the called subscriber onds whereupon the connection of the n its circuit with the polarized relay will to use the armature of the relay to c con t for the o n he s slur operate, c; lied di iring the lug subscribcfis interr the relay 2? being gro nded battery 12., l Z, the lower armaits contact, the relay 21 and its The circuit ino l 4 v i. coniplished in the lisuel manner, and as the conneetorswitch is, a device wh ch 15 The cumulatively wound relay 21 now at-' terruptions occasioned by the calling suloscribcrs interrupter 7 are effective in open ing and closing the circuit of the line relay 26 of the connector switch 0 at the lower armature switch of relay 21, this relay 21 bein gize consequent upon the operation of the interrupter 7. During these impulses the bridge containing the polarized relay (which may be a resistance of five hundred ohms) is shunted by the low resistance bridge traceable from the upper armature switch of relay 2? and its alternate contact, the lower armature switch of relay 21 and its engaged contact, to the lower armature switch of relay 27 to bring the relay 26 into control of the interrupter 2'2. The wipers of the connector switch are consequently lo-- cated in the proper level and are moved about until they engage waiting contacts of the called line, all as will be well understood by those skilled in the art/ When the called subscriber responds the back bridge relay 28 of the connector switch C is included in circuit, the two upper armstureswitches of this back bridge relay engaging their alternate contacts to reverse the connection of the battery 12 in its circuit with the relay 25 to cause the armature switch of this relay 25 to be shifted. i l lien this switch is shifted circuit for the relay 29 is established from the grounded battery 12 through this relay 29, the armature switch of the polarized relay 25' and its then engaged contact, the lower armature switch of relay 30 to its grounded contact. The up per armature switches of relay 29 are provided with connectednorinal contacts and the lower armature switches of this relay are also provided with connected normal contacts.

The top and bottom armature switches are connected with the portion of the selected link connector extending to the connector switch C and the intermediate armature switches are connected with theportions oi the link connector extending to the waiting" contacts engaged by the wipers l3 and 15 of the link selector switch. Thus when the relay 29 is dcenergizcd the link connector intervening between the link selector switch and the connector switch is tclephonically completed excepting for the gap established at the relay 27 during the impulses employed for operating the connector switch 0. When the relay 29 is energized the connections between its armature switches established by their normal contacts are broken so that at these points telephonic connection between the calling and called lines is open.- The alternate contacts of the intermediate armature switches of relay 25) are connected through on induction coil 31 whereby this induction coil is serially connected with the calling line. This induction intermittently energized and dener 'llO coil 31 is in inductive relation with a primary 32 included in a local circuit that contains a telephone transmitter The transmitter is to be operated by a telephone receiver 34 which is included in a conductor that terminates in the alternate contacts of the top and bottom armature switches of relay 29 whereby this receiver 34 is connected with the called subscriber when the relay 29 is energized. A second- I ary 35 is included in series with the receiver 3%, this secondary havinga primary 36 that is included in a local circuit with a transmitter 37 into which a talking device 38 speaks. This talking device'may'be in the nature of a phonograph and the record of the phonograph may be suited to the purpose of the system. For example, the phonograph may speak l Vhat is your number '?ltegister please, suthcient time intervening between the reproductions of these phrases within which the called subscriber may give his number and the calling subscriber may deposit his coin Both subscribers hear these phrases as will be ap parent. The announcement of the nuinbei made by the called party will be relayed from thereceiver 34. to the transmitter 33 and from the induction coil. 82 to the induc: tion coil. 31 whereby the calling party will hear the number announced by the called party. Any current impressed. upon the line at the calling station will not however be relayed to the called station since the trans mitter 83 is incapable of relaying these voice currents impressed at the calling station by Way of the receiver 8%. When the calling subscriber hears the phrases automatically announced by the phonograph he knows that 9. called subscriber has answered and when he hears the called subscribcrs number" the calling subscriber will know that the proper party has answered and will thereupqn deposit the coin l/Vhen the coin 39 is deposited a circuit is,inomentarily established which is traceable from the grounded contact of the switch 40, the companion contact of this switch, the switch hook 1, thence by connections which are apparent to the wiper l5 and from this wiper 15 by connections which are apparent to the lower coil oi the differential relay 22, to the grounded coil of the cumulatively wound relay 21. By connections which are equally obvious the switch 40 is also included in circuit' with the upper winding of the differential relay 22. The coils otthe relay are thus thrown out of balance so that this relay is energized to attract its armature switch to complete the circuit of the relay 3O traceable from the grounded battery 12 the winding of relay 30, the lower armature switch of differential relay 22, the now attracted armature switch of relay ll (which is energized consequent upon' the closure of l the switch of the polarized relay 25) to ground. The relay 30 establishes aloclnng circuit for itself traceable from the battery 12, its upper armature switch and its'engaged contact to the upper grounded armature switch of relay 24. When the relay 30 is energized. circuit for the relay 29 is opened be restored to normal in a manner well.

known by those familiar with automatic telephone practice.

. Assuming that the calling subscriber has an emergency or special call, say for a doctoror tor a fire alarm station and has no.

coin to operate his switch e0, or in case the calling subscriber wishes to use the tele phone service for the companys business such calling subscriber will, by suitable Ina;

nipulation. of his interrupter 7, select the leyel' illustrated in association with the wipers 13, let and 15 as shown in full lines ii Fig; 1. Such. a level of waiting contacts has contact buttons which constitute ter nilnals of link connectors that extend to selector switches such as illustrated at D (which may be of the usual type of selector sw tches as employed in pure automatic practice and which need not therefore be described in detail) and which are employed N for extending the calling line into connection with an. idle operators position, this opcratofis position corresponding to the called station B which was previously described as being connected with the calling line by the connector switch C. The wipers of the selected selector switch D and until the wiper 42 engages an ungrounded waiting contact, such contact being ungrounded when the corresponding operator is idle. When the wipers l3 and at rest upon corresponding waiting contacts, the relay s5 is placed in bridge of the calling line and is consequently energized. The upper and grounded ari'nature switch of the relay 4-5 places ground upon the button engaged by the ,wiper 42 so that any such wiper of any other selector switch I) will not remain in engagement with a similarly positioned contact button in multiple connection with the button thus grounded whereby the same operator is guarded from selection by more than one selector switch. The lower armature switch of the relay l5, when attracted, establishes a circuit through the signal device 46 to attract the attention of the idle operator who depresses her listening key t? to bring her telephone set 48 into circuit relation with the calling subscriber. lit the operetor sscerteins that the calling subscriber is entitled to free use of a telephone connection such operator will efi'ect or permit the extension or" the calling line into connection with the line of the station desired by the calling subscriber.

In the embodiment of the invention illustrated the various lines are provided with spring jacks 419 located before such operator and the link connector conductors that en able the operators to eii'ect connection between their telephones and the telephones of calling subscribers are extended into connection with terminal plugs 50 which may be inserted within jocks e9 for iurpose of completing connection between ceiling and called subscribers. The link connector terminating in the plug" 50 may be provided with the usual supervisory apparatus which need not be described and may be provided with the usual ringing outfit for signaling the called subscribers bell, all as is well understood by those skilled in the art.

The operator ,mey, from time to time, bridge her telephone into the estziblished circuit to make sure that the calling s'ubscriber is using the established circiiit properly within his privilege.

I believe it to be broadly neiv with me to provide system of the class indicated in which there is provided at speciel operators position for renking connections between calling and called stations whether prepaid or prechsrge connections are estsb lishcd with the aid of the automatic equipinent illustrated or by any other means, semi-automatic or manual.

While I have herein shown and particularly described the preferred embodiment oi? my invention, 1 do not wish to be limited to the precise details of construction and cir cuit arrangement shown as changes may readily be made Without departing" from the spirit of the invention, but

"bus having described my inve "on claim as new and desire to secure by letters .Patent the following I s 1. A. telephone exchange system includi telephone lines extending: from subscribers stations to an exchange at some of which stations are located devices requirine operation by ceiling subscribers after responses by called subscribers in order to complete connection between calling and called subscribers, there being meens at the subscribers stations cooperating With these devices and operable by responding celled subscribers; link connectors at the exchange "for uniting: lines in conversation: switching: mechanism associated with said linlr connectors for iJl'QRlCUlfi telephonic connection between celling and called stations for telephonic current impressed upon ceiling); lines st calling tions; electromagnetic mechanism by the aforesaid equipped therewith in cooperation Witl. aforesaid means at stations of res;

culled subscribers for operating;- ssid switch and completing conncc and celled nddr controlled linlr connectors connection between Cilillllf}:

J? Li. 1 L l l ins" mechanism between calling tionsl one tor for establishing and called stations independently o vices requiring" operation by calling sub scribers sitter responses by celled subscribmeans whereby calling;- subscribers have telephonic connection with an opera independently of his device requiringopera tion in ore charged or prepaid connec end electro-njingnetic SNliCill-fltfl' mesh for automatically conncctinn the sddi linlr connectors With calling 1 2. i1 telephone exchange Qt telephone lines est-ending i .l'OHi stations to an exchange some t stations are located devices re irinr eoerstion by calling; subscriliiers in order to complete connection between cellii and. celled subscribers: link connectors it; the ohene'e for uniting lines in conversuti 7 switching mechanism associated with. said linlr'connect as for iflltftkillfi' telephonic connection. bets ecn ceiling and called stations for telephonic current impressed noon on inn lines at culling stations; electro-- um new mechanism operated by the silo s ceiling stations equipped here with tor o 'ierntine the Swlii llii'lff ineciu nisni and to ceniiiletc connection between on l celled Stet-ions: udtlitiiinal on itliOl' trt lc l nit connectors for in c i nection between culling st 7 celled stations independently of requiring on erstion by selling subscribers after resnons-es by celled subscribers; :meons whereby cellsubscribers i my have tele honie connection with-an operator independently of his device requiring; onerzi'tion imnrecbnrzed prepaid connections; and electroietic switchinf' mechanism to:- suto 'rm'ti necting' the odditionnl iinlr eminent calling" lines 8. A tele "one exchunn'e s vsteni inciu telenuone l etrtcndi 535 from stations nu exchange at some t t stations are located devices requir' tion by calling subscrib" otter culled subscribers in order to comp ncction between csllinn endculled sut ers, there b ins st the subserioers stations coii 'ieretingr with t devices (int i operable by responding celled si'lbscribers;

uni ting e for and called stations for telephonic current tion in precharged or prepaid connections;

means whereby the operator may supervise uncharged connections between calling and called stations; and electromagnetic switching mechanism for automatically connecting the additional link connectors with calling lines.

4. A telephone exchange system including telephone lines extending from subscribers stations to an exchange at some of which stations are located devices requiring operation by calling subscribers in order to complete connection between calling and calledlsubscribers; link connectors at the exchange for uniting lines in conversation; switching mechanism associated with said link connectors for breaking telephonic connection between calling and called stations for telephonic current'impressed upon calling lines at calling stations; electro-magnetic mechanism operated by the aforesaid devices at calling stations equipped therewith for operating the switching mechanism to complete connection between calling and -alled stations; additional operator controlled link connectors for establishing connection between calling and called stations independently of the devices requiring operation by calling subscribers after responses, by called subscribers; means whereby calling subscribers may have telephonic connection with an operator independently of his device requiring operation in precharged or prepaid connections; mea'nswhereby the operator may supervise uncharged connections between calling and called stations; and electro-magnetic switching mechanism for automatically connecting the additional link connectors with callin lines.

5. X telephone exchange system including telephone lines extending from subscribers stations to an exchange at some of which.

stations are located devices requiring operation by calling subscribers after responses by called subscribers in order to complete connection between calling and called subscribers, there being means at the subscribers r stations cooperating with these devices and operable by responding called subscribers; link connectors at the exchange for uniting lines in conversation; switching mechanism associated with said link connectors for breaking telephonic connection between calling and called stations for telephonic current impressed upon calling lines at calling stations; electro-magnetic mechanism governed by the aforesaid devices at calling stations equipped therewith in cooperation with the aforesaid means at stations of responding called subscribers for operating said switching mechanism and completing connection between calling and called stations; additional operator cont-rolled link connectors for establishing connection between calling and called stations independently of the devices requiring operation by calling subscribers after responses by called subscribers; means whereby calling subscribers may have telephonic connection with an operator independently of his device requiring operation in prccharged or prepaid connections; and electro-magnetic switching mechanism for automatically connecting the aforesaid link connectors with calling lines.

G. A telephone exchange system including telephone lines extending-from subscribers stations to an exchange at some of which stations are located devices requiring opera-- tion by calling subscribers in order to complete connection between calling and called subscribers; link connectors at the exchange for uniting lines in conversation; switching mechanism associated with. said link connectors for breaking telephonic connection between ca-lling andcalled stations for telephonic current impressed upon calling lines at calling stations; electromagnetic mechanism operated by the aforesaid devices at calling stations equipped therewith for operating the switching mechanism to complete connection between calling and called stations; additional operator controlled link connectors for establishing connection between calling and called stations independently of the devices requiring operation by calling subscribers after responses by called subscribers; means whereby calling subscribers may have telephonic connection with an operator independently of his device requiring operation in preelia'rged or prepaid connections; and electro-magnetic switching mechanism for automatically con necting theaforesaid link connectors with calling lines.

7. A telephone exchange system including telephone lines extending from subscribers stations to an exchange at some of which stations are located devices requiring-operation by calling subscribers after responses byicalled subscribers in order to complete connection between calling and called subto compLi ion.

associated Anemia sii swng means era'tm able b @rs; link ccnnectors at in convcrsarion:

( ted man s ale 1m.

1 A. ctr0- 4;- it L ulpped.

oresa-ld tinned C I? J ascribe adfii may have 1 between cahmg and ml 0113; mam

swi'tcimin AQCUOH b operation 1 116 901161112 called subs perv :11

ilnprossa Lions overned b the neiii-ms for b phonic (nu-yen 0 at calling 5%.

1mm calling stations a 0per 1 tions ms 15 operating completing so caliec i stations; trnflmi link motion bei t fflfiiOu callin by called. subscriber fibers Y wlth an operator inde' device raquirin or m'eepaid connect am? may 5 turns betwee is swit ne t

Images