US1035159A - Telephone system. - Google Patents

Description

LAUSEN.

.TELEPHONE SYSTEM. APPLICATION ULEB JUL? 24. 1503.

H. Plv C VPatented Aug. 13, 1912.

f UNITED STATES PATENT OF'ltlllCEs HENRY P. GLAUSEN, OF CHCAGO, ILLINOIS, ASSIGN 01%,' BY MESNE ASSIGNMENTS, TO

STROISBERG-CAELSON TFLEPHGNE MANUFACTURING NEW YORK, A CIRPORA?r 'CON 0F NEW YORK.

COMPANY, OF ROCHESTER,

TELEPHONE SYSTEM.

Specification of Letters Patent.

Application filed July 24, 1903. Serial No. 166,795.

To all whom it may concern:

Be it known' that I, HENRY P. CLAUsEN, a citizen of the United States of America, and resident of Chicago, Cool( Improvement in Telephone Systems, of which the followingis a specification.

My invention relates to telephone systems of that type in which all ot the current', both for signaling and talking purposes, Yis supplied from a common battery or centralized source of current supply located at the eX- change or central station. f l

It also relates, more particularly, to telephone systems of that character in which complete metallic line connection is. em-

ployed between the sub-stations and the eX- In systems of.

change -or central station. this type it .is also usually the practice to employ line lamp signals for enabling` the subscribers to call-in and attract the attention of the operators, and to also employ supervisory or clearing-out signals whereby the subscribers may signal for a disconnection. These lampv signals are usually mounted on the switchboard and are preferably controlled by line and supervisoryr relays. lith this arrangement, the line lamp signals respond when the subscribers call-in by removiugtheir receivers from the switch hooks, and the supervisory signals respond when the subscribers hang` up or replace tlieirreceivers after having finished their conversation. I

Generally stated7 the object ot my invention is the provision 'ot an improved and highly etlicicnt tclephoiu` system ot' the foregoing character.

A special object is the provision of an improved circuit arrangement .whereby only two wires or conductors ,are necessary for each spring jack with which the different lines are connected at the switchboard, and also tor each cord circuit by which connection is establisucd between the diliercnt lines. v

\nothcr object is to provide an improved construction ot line signal apparatus-that is to say. an improved construction of that portion ot the apparatus by which the subscribers call-in and attract the attention ot thtx operators.

lt is also an object to provide certain dcails and tentures of improvement tending` county, Illi-` nois, have invented a certain new 'and useful to increase the general eliiciency and serviceability of a common battery telephone system of this particular character. i

To the foregoing and other useful ends, my invention consists in matters hereinafter set forth and claimed.

he accompanying drawing is a diagram illustratin a common battery telephone system embot ying the principles ot' my invention, only two sub-stations ani one operators cord circuit being shown. ,it being understood, however, that the system may involve as many sub-stations as the size and growth ofv the exchange demands, and as many operators cord circuits as are necessary in order to enable the roperators to establish the connections with facility and promptness.

As thus illustrated, my improved com )n battery telephone system comprises .ibstations A and B, the former connected by two parallel limbs or line conductors with a spring jaclr C, and the latter being likewise connected with a spring jack D, the two jacks being located on the switch-boart'l at the exchange or central station. kThe system also involves an operators cor'd circuit E, provided with answering and calling' plugs e and c1, and thus adapted tur establishing connection between the l aid lines. A line signal F is associated wila the jack C, whereby subscriber A may attract the :utcntion of the operator when he desires to talk with some other subscriber. ln a similar manner and tor a similar purpose. a` line lamp G is associated with the, jack l). A\s will be observed, supervisory lamp signals e2 and e3 are provided and associated with the operators cord circuit. These supervisory signals. which are controlled b v suitable rela;y "'id by the switch-hooks at llal suli-stations.y enable the suliscribcrs lo signal the operator For a discomwclhm. .\ll ol Vn current. both (hat which is employed for talking and that which is employed lor sigz'- f nalin;r purposes, is supplied from a common battery or ccutralimal source oiI supply ll,

The line` lamp signals arc also controlled by suitable liml and cntotlwvlays` and h v the .said suitch-hoolts The jacks and plugs arc also adapte/l. as will hereinafter said more fully appear, to ha vc a certain,

oi' control over the .said signals. ot my invention will, bonen-rl he understood by considering the manner in which the operator establishes connection between the two lines.

Suppose, for example, that subscriber A desires to talk with;subscriber B. vIn such case, subscriber A removes his receiver a from the the switch-hook a1, and in so doing closes aline circuit from the battery H through the conductor 1, through the `Acoil r2 of the cut-0H relay, through the conductor 3 and the limb or line conductor 4, through the winding 5 of the inductive connection between said receiver and the line circuit, through the coi'tact 6 and the said switchhook a1, through the transmitter 7 through the other limb or iine conductor 8, thence through the armature contact 9 and the stationary contact 10 of the cut-off relay, through the-contact 11 and the armature 12 of the line relay, through the coil 13 ot' said line relay, through the conductor 14, through vthe stationary contact 15 and the armature contact 16 of the said cut-olf relay, thence through the conductor 17, and through the conductor' 18 to said battery.' The current flowing through this circuit is sufficient to energize ,therelay 13, and the relative resistances are such that this line relay is en# ergized and the circuit thereby opened before the current has time to energize the cut-off relay. The armature 12 when atltracted by the magnet of the line relay 13,

opens kthe circuit of the coil 2, andat the same time closes a lo'cal circuit from the battery H through the ground or comnion connections 19 and 20, through the line lamp signal F, through the contact point l21, through the armatureA 12, through the coil 13 of the line relay, thence through the conductor 14 and the contact 15, through the armature contact 16, and thence through the conductors 17 and 18 to said battery. Thus, as stated, the line relay opens the line circuit before the current has time to energize the cut-ofi' relay, and in so doing closes the local circuit of the line lamp and causes the latter to glow.' The operator observing this signal inserts the plug e in the jack C. This closes a local circuit from the battery H through the ground or common connections 19 and 2 2, through thecoil of the supervisory relay 23, through the conductor 24, through the talking strand 25, through the plug sleeve 26, through the ring or thimble 27 of said jack, thence through the conductor 28 and Ithe coil 29 of the cut-off relay, and through the conductor 18 to said battery. The current flowing in this derived circuit energizes the relay 23 and also the said cut-off relay. The relay 23 then pulls up its armature 30 and causes the same to engage Kthe contact 31, thereby closing the normally open switch point in the circuit of the supervisory lamp e2.- The energizing of the cut-oli relay attracts the armature 33,

ahommes and in so doing separates the contacts 15 and 16, thereby opening the local circuit of the relay 13 and the line lamp signal F. In addition, the energizing of the cut-off relay through this derived circuit causes the armature contact 9 to engage the stationary contact 34, thereby closing the normally open. switch point in one side of the talking circuit between the jack C and substation A.

It will also be observed that this energizing of the cut-off relay separates thel contacts i 9 and 10. The closing of the contacts 9 and -34 not only establishes the continuity of the talking circuit, but also closes a line circuit including the battery and including both of the coils 2 and 29. In this way the cut-off relay is fully energized and keeps its armature in the proper .position during conversation between the subscribers. The operator then presses 'her listening key e4, so as to bridge her talking set I across the cord circuit. She then converses with the oil.

vcalling subscriber and learns the number of the desired connection. After this, she can then insert the calling plug e1L in the jack D. This act on the part'of the operator establishes a derived circuit from the battery H through the ground or common connections 19 and 22, through the supervisory relay 35, through the conductor 36,*through the contact 37 and the ringing key e, thence through the-talking strand 38, through the plug or thimble 40 of jack D, thence through I the conductor 41, through the coil 42 of the cut-olf relay L associated with the called subscribers line, and through the conductor 43 to said battery.l This energizes the said cut-oil relay, causing it to attract-its arma ture 44, and to thereby open a switch point;

in the derived local circuit of the lamp G and the' liiie relay 45. In this way the operator places the line signal apparatus in such condition that subscriber B can answer the call without causing the lamp G to glow. The current flowing through thisv circuit causes the relay 35 to attract its armature and thereby close a localcircuit from the battery H through the ground or common connections 19 and 22, through the armature 46 and the contact 47, through the super- 115 visory lamp c3, through the contact 48 and the armature 49, and through the conductor 50 to said battery. The current flowing through this local circuit is sufficient to light the said lamp e3. Except possibly with the exception ofthe brief interval in which the Voperator is projecting ringing current on to the called subscribers line for the purpose of ringing the bell at sub-station B, this laiiip c3 continues to glow until the sub- 125 57 and 5o, through the relay 42 can be maintained in its energized condition during this projection of ringing current on to the called subscribers line, by simply providing the generator bridge 5l with a ground tap 52 containing an inipedance coil Vvlith this ar 1angeinent the pressing of the said ringing key completes a circuit from the battery ll through the ground or connnon connections 1f) and 5l, through the said impedance coil 52E and the conductors 52 and 5l, through the contact 55, Jthrough the said ringing key, through the talking strand 35, tlnrough the plug sleeve 39 and the ring or thiinble -l-O ot the jack.n thence through the coiuluctor -ll and the coil 42 ot the eut-ott' relay, and thence through the conductor lf3 to said battery. In this way the pressing ot, the ringing key establishes a temporary derived circuit for maintaining the cut-ott relay in an energized condition, so as to keep the contacts 5G and 57, through which the'ringing current inust pass in order to be oi' use, in a closed condition. The current from the generator ,l rings theI bell l) at sub-station B. This bell* is preferably in series with 'the condenser 1. which latter stops the tlow of battery current, but at the samevtiine permits the passage ot' the alternating current troni the generator. At this juncture it will also be Seen 'that the hell at is arranged in series with a condenser (z3 at sub-station A. The Subscriber at sub-station B responds by re` moving his receiver b2 from the switch hook b1, thereby closing a line circuit from the hattery'lil through' the connections Alf) and 22, through the supervisory relay 59. through the conductor 5S), through the con` tact GO and the listening key et, through the conductor 61 and the contact (S2. through the ringing key c5 and the talking strand (3?, through the plug tip G-l and the jack spring 65, through the conductor (Slt through the winding (i7 ot the inductive connection between the receiver b2 and the line circuit. through the contact 68, through the switch hook bl, through the transmitter (Si). through the line conductor Tt), through the contacts coil l2 ot` the cut-ott' relay, and tlience through the conductor lil to said battery. lt will also be observed that the called subscriber' in answvering` the call completes a line circuit including the coil 7l ot the cut-ott' relay associated with this line.` ln otherA words. the relays 55% and 7l are placed in parallel. The energizing ot the relay 5S cpens the normally closed switch point composed of the armature 4l; and the contact 4:7 in the local circuit ot the lamp u". thereby causing the latter to cease glowing. In this way the called subscriber in a nswcring the call restores the supervisory Isignal and thereby advises the operator that he has responded and is in communication with i l l l cuits are open at the `ubfl the calling subscriber. The through talkl juncture, it will be seen that ing circuit thus established between the two subscribers includes, it will he observed, the limbs of the two lines, the plug and jack contacts, and the talking strands ort the cord circuit, the latter being preferably provided with condensers 72 and 73. During conversation current is supplied to this talking circuitV through the coils and 29 and 7l and l2, which in this way lact. as resistance to regulate the current supply. Furthermore, as these coils are provided with cures, so that they may also act as cut-oltI relays, it will he seen that 'they have the further t'uuction of acting as impedance or retard'..tio.n to prevent the passage ot' voice eiuren'ts The relays in the cord circuit, although bridged across the cord circuit` are ot' substantially high impedance or retardation to prevent the passage through them ot' the voice currents traversing the talking circuit.

When the subscribers have finished their conversation, and have hung up their receivers, the opening of the line circuits causes the lamps @2 and c3 to glow. Suppose, for example, that subscriber A hangs up his receiver tirst. The opening ot' the line circuity leadingt'roni this sub-station opens the circuit of the supervisory relay 74., it being observed that during conversation this relay has remained energized` owing to itsbeing connected at such time in parallel with the coil Q. This relay 7l when deenergized completes a local circuit from the battery H through the connections 19 and 2Q, through the armature T5 and the contact TG, through the lamp c2, through the contact 3l and the armature 30. and through tho conductor TT to said battery. This causesl the lamp e2 to `glow and thereby give the signal t'or disconnection. ln a similar inanncr the subscriber at substation l); in hanging up his reeei ver opens the line circuit. dc ei'iergizes the relay 58. and thus closes the previously described circuit. ot the lamp c3. The said lamp then responds to the [low o'll current and gives the signal for disconnection at' this end ot the cord circuit. 'llhe operator. upon withdrawing the plugs troni the jacks, opens thecircuits ot' the relays 23E and 35. and thus restores the lauipsc'-` and r3. 'lhe withdra val ot' the plugs` in thisI manner also. ot course. deliuergif/,es the coils :'29 and li ot the two cut-ott relays, allowing the latter to reestablish the normally open switch points iu the two line circuits. It also lrestablishes the normally closed shunts around these two switch points, but ina`- uuu-h as the line circuitsA are open al the. sub-statitms. the (lt-energizing ol the cut-oli relays in this manner does not cause the line lamps lo glow. This is duc. it will be seen. lo the 'tact that no battery current can flow through the relays l and i3 when the ril- :ltliil *.X llllH the coilsll and 29, the contacts 15 and'16, the armature 12 Mid the contact 11, and the contacts v1() and 9 constitute normally'closed shunts around the normally' openswitch point composed 5 of the contacts 9 and 34. This shunt, it will be seen, is thus not only controlled by the cut-ofi' relay K, but also, by the line relay 13. .In this way the said line relay is adapted lto form part of both line and local circuits, and to automatically openthe-sub-A scribers line circuit and simultaneously therewith close the circuit of the lamp F.'

Thus there 'is no current on the subscribers line when the operator plugs-in and cuts the battery oft' from the line signal, and consequently the operator can vanswer the call without producing an objectionable noise in the receiver at sub-station A. In other words, the' arrangement tends to quiet the line in answering calls.V In al similar way thecoil 42 and thecoil45, contacts 78 and 79, the contacts 80 and 81, and the contact 57 and the armature 82, constitute a normally closed shunt around the normally open switchpoint coin osed of the contacts 56 andA 57. The coi of the line rela 45 is adapted to serve as part of both line and ,v local circuits, and this relay is adapted, like f the relay 13, to automatically open the line 30 circuit and simultaneously therewith close the local circuit of the lamp G when the subscriber at sub-statioii B calls-iii. In other words, the line signal apparatus at this side of the circuit is substantially the same as the line signal apparatus allotted to the line leading from sub-station vA.

It will be seen that with my improved apparatus only two wires or conductors are necessary for each jack, and that only two strands are necessary for the cord circuit, notwithstanding the fact that my improved system is characterized by the mostapproved methods of operation. with respect to signaling and supervision, and also with respect to current supply andthe manner in which the connections are established.

It is obvious thatl the resistaiices of t-he various relays can be adjusted or regulated to suit the conditions of any particular case, and can be varied Within limits and to an extent which will not be inconsistent with their functions and mode of operation. It is also obvious that tlie feature of having the relays 18 and l5 more responsive than the 55 coils 2 and 71 of the cut-oit relays, can be accomplished in any suitable manner.v For example, this can be done by a suitable adjustment or regulation of the resistances of the different coils, so as to have the coils 2 and 71 insure a more sluggish action or energizing of the cut-off relays than that of the line relays. Again, the cutotf relays can'be given a tighter adjustment, or can be so mechanically constructed that the line 65 relays will pull up and break the circuits of the coils 2 and 71 before the cut-olf relays can become energized. In other words, any suitable expedient can be employed for enabling the line relays torespond quickly and 'in such manner as to open the circuits of the coils'2 and 71 and close the circuits of the lain s F and Gr before the cut-oil relays can become sutliciently energized to attract their armatures and open the switch points which they'themselves control in the circuits of the line relays.

Other advantages will be obvious to those skilled in the art.

' What I claim as my invention is 1. A telephone system comprising a subscribers line, a subseribers switchfor opning and closing` the line circuit, a central source of current, a line relay provided with normally closed and normally open contacts, a line lamp signal, and suitable'circuitconneetions whereby the coil of said relay and its said normally closed switch contacts are included in a line circuit when the subscriber calls-in,xand whereby the said lamp signal and normally open contacts are then 9e included in a closed local circuit by the energizing of the said relay.

2. A telephone system comprisingy a subscribers line, a line 'relay and means for energizing it, said relay lbeing provided with normally closed contacts through which the coil of saidreay is adapted to be initially energized ,and a local energizin circuit for said relay adapted to be closed y the energizing'of the same. y

3. A telephone system comprising a subscribers line, suitable sub-station apparatus, and vsuitable switchboard apparatus, the latter apparatus including a line relay p adapted when energized to open the line ci'r- 105 cuit by which it is energized. 4 f

scribers line, suitable sub-station apparatus, and suitable switchboard apparatus, the latter apparatus including a" .line relay 110 having normally closed contacts adapted to serve as part of the initial energizing circuit of said rela and a local energizing circuit for said re ay adaptednto be closed by y the energizing of the same.

5. A telephone system comprising a subscribers line, suitable sub-station apparatus, and switchboard apparatus, thelatter apparat-us including a line relay and a cut-off relay, said relays having normally closed contacts connected normally in s'eries with the coils of said relays, and also -in series with said line.

6. A telephone system comprising a subscribers line, suitable sub-station apparatus, and switchboard apparatus, the latter apparatus including line -and cut-ott` relays,A said eut-ott' relay having a coil adapted to serve as part of .the initial energizing cir y 'cuit of said line relay and a localA energizing 1.30

telephone system comprising a subcircuit torsaid relay adapted to be closed by the energizing of the same.

'l'. n. telephone system comprising a subscribers line, suitable-,substation apparatus, and switchboard ati'paratus, the latter apparatus including linehanld cut-ott relays, said relajzsliaring normally closed contacts,

and said cut-eil' relay having a coil adapted with said contacts to constitute a part of the initial energizing circuit of said line relay.

S. A teleplionesystein comprising a sub? scribers line, suitable/su'us'tation apparatus, a spring jack, a relay, a battery for furnishing current to energize said relay, an operators cord circuit proyidedwth a plug adapted for insertion in said jack, a bridge adapted to be connected with opposite sides oi said cord circuit, said bridge including a generator, suitable circuit connections, and an impedance coil connected `between said bridge and ground, said impedance coil being adapted to insure an energizing circuit for said relay during the time the said gen erator is connected with the said circuit.

9. A telephone system comprising rsubscriberslines, suitable sub-station apparatus for each line, a two-way spring jack connected with cach line, a normally open switchpoiiit in one side ot each line, a line relay and a cut-ottrelay for each line, line lamp signals adapted to be controlled by said line relays, eacliy oit said relays being provided with normally closed contacts, ncrmally closed shunts around said normally open switch points, each shunt including" normally closed contacts and coils of said relays, an operators tWo-Way cord circuit provided with plugs adapted for insertion in said jacks, a pair of relays bridged across one end of the cord circuit, a supervisory lamp adapted to.be conjointly controlled by said pair of relays, another pair of reT lays bridged across the other end of the cord' circuit, a second supervisory lamp adapted to be conjointly controlled by said second pair of relays, one relay of each pair being adapted to be controlled by one of said plugs and jacks, the other relay of each pair being adapted to be conjointly controlled by one of said plugs and jacks and means at a sub-station, and suitable circuit connections and means tor supplying current.

10. in a telephone system, tlie combination o'a subscribcrs line relay, a subscribers line, a normally open line circuit for initially energizing said relay, said relay being adapted to open said circuit as. soon as energized, and a local energizing circuit tor said relay adapted to be closed as soon as the saine is energized.

ll. ln telephone system, the combination with a telephone line, ot a line relay therefor, a line signal, a cutoff relay for the line, said cut-oit relay having-a pair of conall necessary tacts normally in series with the line relay, said contacts being in series with `the line relay and the line signal during the display of the signal, the actuation of tlie cut-ott relay being adapted to open said contacts.

l2. In a telephone system, the combination with a telephone line, of a line relay and a source of current normally bridged between the limbs of the telephone line at the central olicc, a line signah the actuation of said line relay being adapted to sever said bridge and to place said line signal and said Yline relay in a local circuit with said source,

and a cut-ott relay adapted to be actuated to sever said local circuit and to replace said source in a. bridge between the line conduc-` tors.

13. In a telephone system, the combina` tion with a telephone line, ot a source of cur. rent and a line relay normally bridged be tween the limbs of said line at the central oice, a local energizing circuit for said line relay and a cut-oil` relay adapted, when actuated, to sever the local energizing circuit for said line relay.

14. In a telephone exchange system, the combination of a supervisory signal, a pair of relays conjointly controlling said signal, a local energizing circuit for one of said relays, a line signal, a second pair of relays conjointly controlling the said line signal, and local and line circuits .each controlled by the relays of said second pair.

l5. In a telephone exchange system, the combination of a supervisory signal, a pair ot relays conjointly controlling said signal, a local energizing circuit for one of said relays, a line signal, a second pair of relays conjointly cont-rolling the said line, signal, local and line circuits each controlled by the relays of said second pair, and an energizing circuit common to a relay ot eacli pair.

16. ln a telephone exchange system, tlic combination ot a` supervisory signal, a pair of relays conjointly controlling said signal, a local energizing circuit for one ot said rc lays, a line signal, a second pair of relays conjointly controlling the said line signal,

local and line circuit-s each controlled by the relays 'of said second pair, and an energizing circuit common to a relay of said energizing circuit being local.

17. In a telephone exchange system, the combination ot a supervisory signal. a of relays conjointly controlling seid si a local energizing circuit for one ot s relays, a line signal, a second ,lair ot .c each controlling the said lino si and line circuits conjointly 'contro relays of said second pair. an ener cuit common to a relay ot eac'o telephone line included in salu circuit. l l 18. In a telephone syst-ein, mi. ,.'i. line, a line relay, a jack for .sain luie, a cuteacli pair,

SOY

off relay for opening the circuit. of the line relay and closing a talking connection between the jack and the line, one side of the line being permanently connected with the jack, a cord circuit having a pair ot' supervisory relays bridged'between the talking strands thereof, a supervisory signal controlled byl said supervisor-y relays, and a local cil-cuit 'for'energizing the cut-oli relay .in series with one of said supervisory relays .the line, a' cord circuit hayinga pair, of supervisory,` relays' bridged ,between the talk! strandsf'thereof, means for supplying current to' the line Vfor talking purposes, a supervisory signal controlled ,by said super visory relays, and a circuitl for energizing the cut-0E relay' in series with the jack and one offsai'd v'superyisory relays, the energiz-v ing lof the cut olf'relay serving to disconnect the linel relay from the line.

20.-In1a telephone system, a subscribers line, a jack provided with a contact perinan'ently connected withone side of said line, a. line relay, and a cut-olf relay provided with means for denergizing said line relay and closing a talking connection between the jack and the Iother. side of said line, the energizing of the cut 0H relay serving to disconnectthe line relay from the line.

21'. In a telephone system, a subscribers fline, a jack having one contact thereof permanently connected with one side of the line, a line relay, a circuit for energizing the line relay, and a cut-ofi' relay provided with nieansfor simultaneously opening said circuit and establishing a talking connection between the'jack and the other side of said line, the energizing of the cut off relay Iserving to disconnectI the line relay from the line.

22. In a telephone syste'rn, gis'ubs'cribes'` line, a line relay, a source of current, said relay being normally connected between one side of the line and one pole of the source of current, a line circuit including the relay and source of current in series, a vlocal circuit for said relay, and a cut-off relay provided with means for opening said circuit at a point between said line relay and the pole of the source of current to which it isA normally connected. l

23. In a telephone system, a subscribers line, a line relay therefor, a source of talking and' operating current, a hne circiut m- '24. Inl a telephone s ste'm,la11 subscribers or,za.,soll1rce` of talkv line, -a line-,relay there ing and Loperating current, afgackfhaving one contact thereof permanently. connected with one side of the line, an elect-romagnet, a line circuit including the line relay in series with the said source of current, means operated by said electromagnet for opening ysaid circuit at a point betweenjthe line rela.

and the pole of said source of current wit cuit for said relay, and means operated by said electromagnet for closin a talking con- .v nection between the jack van the other slde of the line.

25.v In a telephone system, a llne, a relay controlling the continuity of said line and having a winding included in a normally closed battery bridge across said line at ther exchange of central station.l

Signed by me at Chicago, Cook county,

Illinois, this 18th day of July, 1903." .i

HENRYv P. CLAUSEN. Witnesses:

A. F. DURAND, WM. A. HARDERS.

80 which it is normally connected, a local cirf

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