US1116542A - Telephony. - Google Patents

Description

M. L. JOHNSON.

TELEPHONY.

APPLICATION FILED no.4, 1912 1 ,1 1 6,542. Patented Nov. 10, 1914.

2 SHEETS-SHEET 1.

WITNESSES INVENTOR 1 BQFQBW TONLLJomqsou ATTORNEY M. L. JOHNSON.

TELEPHONY. 1,116,542.

APPLICATION FILED DEG.4, 1912.

Patented Nov. 10, 1914.

2 $HEETS-SHEET 2.

QNITNRESSES N Y O e 4 L V ENTD R M ORTON LrJ-ozmson ATTQ RNEY UNITED STATE? PATENT OFFICE.

MORTON L. JOHNSON, OF CHICAGO, ILLINOIS, ASSIGNOB, BY MESNE OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

FRANK B. COOK COMPANY,

TELEPHONY.

Application filed December 4, 1912.

Specification of Letters Patent.

Serial No. 734,863.

To all whomit may concern:

Be it known that I, MORTON L. Jonxson, citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Telephony, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention relates to signaling systems and has for its object the provision of such a system in which a plurality of signal sending lines may be separably associated with the signal receiving instrument which is interchangeably associated with the sending lines by means of suitable selector mechanism, there being preferably provided a plurality cf signal receivers less in number than the sendinglines, the selector mechanism serving to associate sending lines with idle signal receivers to the exclusion sending lines.

My invention, ment, constitutes signaling system application Serial No. 1912.

My invention connection with telephone exchange systems and by means of the invention I am enabled to receive and, if desired. to record the numbers of calling lines by signal receivers that are less in number than the lines and which are r-electively associated with the lines in the general manner which has been described. These signal receivers may, if desired, be individual tothe operators positions and the circuit for efl'ecting their operation may, if desired, be accompanied by conductors constituting selected extensions of calling lines with which the operators telephones may be connected in order that the operators may ascertain the numbers of the called lines. the signal receivers then serving to indicate to the operators the numbers of the calling lines. \Vhen the open ators have been informed automatically of the numbers of the calling lines by means of said signal receivers and have been informed by the calling subscribers of the numbers of the desired lines, the operators may proceed to connect the calling and called lines by usual or preferred equipment.

in its preferred embodian improvement upon the disclosed in my co-pending TOQAZ'. filed June 15.

l which i 1f signalrecei'vers previously associated with other is of particular service in I will explain my invention more fully by reference to the accompanying drawings in Figures 1 and 2 taken collectively with the conductors at the tops of the sheets in alinenicnt. illustrate a telephone exchange system having a signaling system of my invention.

1 have shown but two telephone lines extending to stations N0. 1357 and N0. 1358, though it will be understood that there are many telephone lines of the kind illustrated, the two lines illustrated being assumed to belong to the same group of one hundred lines, it being preferable to divide the lines leading to the same exchange into groups of one hundred. At each of the telephone stations illustrated I have shown a telephone switch hook 1 having a normal contact which the telephone receiver 2 when, upon the switch hook. whereby a signal bell bridge including a signal hell 3 and a condenser 4 is connected between the sides of the line. The telephone switch hook I has an alternate contact'which is engaged thereby when the receiver 2 is removed whereby a telephone bridge is established between the sides of the line and which bridge includes telephone receiver 2 and telephone transmitter 5. The line sides terminate at the exchange in the armature switches of a cutoff relay 6, the line sides also terminating directly in multiple jacks'7. The operator may connect calling and called lines by means of any preferred equipment such as the cord circuit link connector equipment illustrated at 8. I will not describe the ink connector 9 as the illustration furnrbed will be sufficient to enable the same read to he understood by those skilled in the art.

, It inay be assumed that station 1357 is a calling station and that station 1358 is a called station. When the calling party at station 1357 removes his telephone receiver 2 from its switch hook circuit is established at the calling subscribers switch hook by way of the armature switches of the cutoti relay 6 and the armature switches of a second cutoff relay 9' through the common battery 10 and the line relay 11. lVhen the armature switch of the line relay 11 engages its alternate contact a circuit is established from its armature switch, which is grounded, through its alternate contact, the armature 1 switch of relay 1'2 and its normal contact,

ASSIGNMENTS, TO

Patent-ed Nov. 10, 1914.

is engaged therewith through the agency of the rotary magnet 13, the sluggishly operating relay 14, the left hand armature switch of this relay and the contact engaged there by, the side switch wiper 15 in its first position, to the grounded battery 10. The rotary magnet 13 thereupon sets the wipers 16, 17, 18, 19, 20 and 21"into operation, these wipers being mounted upon a shaft common thereto, and they continue their rotary step by step movement until the wiper 18 engages an ungrounded waiti gcontact. That 1s, these wipers 16 to 21 inclusive are set into operation toseek the calling line and are arrested in association with such calling line owing to the removal of ground from association with the calling line at the armature switch of the line relay 11 of the calling llne. The waiting contacts wiper 18 are normally grounded by way of the normal contacts of the armature switches of the relays 11 of the group of telephone lines which have contacts individual thereto in the set of waiting contacts for the wiper 18, each of the other wipers 16 to 21 inclusive also having waiting contacts individual to the lines in the group to which the line selecting switch being described is appropriated. Under the assumpion that there are one hundred lines in a group the wipers 16. to 21 inclusive have one hundred waiting contacts.

In order that more than one calling line in a group may be hunted at the same time the selector switch having wipers 16 to 21 inclusive is associated with additional similar line hunting switches, the similarly positioned waiting contacts of the wipers of these line hunting switches being multiply related. -When the wiper 18 has engaged the waiting contact from which ground has been disconnected at the armature switch of the corresponding calling line, circuit for the private magnet 22, which was estab* lished upon the initial operation of the rotary magnet 13, is opened at the armature switch of the calling line whereby the side switch wipers 15, 23 and 24 are moved into their second and final positions in which the circuit of the rotary magnet 13 is opened at the wiper 15 whereby the wipers 10 to 21 inclusive remain in the position to which they have been brought. WVhen the side switch wiper 24 is brought into its second position circuit is established from its grounded waiting contact through this side switch wiper, the wiper 19 and the waiting contact then engaged thereby, the cutoff. relay 9 to the grounded battery 10. When the. cutoff relay 9 is energized ,its lower armature switch opens the circuit for the line relay 11 whereby ground is restored to the waiting contact engaged by the wiper 18 so that similar multiply related contacts in other line seeking switches will be grounded to prevent any such other linel seeking switch from selecting the calling line previously selected by the switch whose wiper 18 has been actuated and thereafter brought to rest as described. Owing to the deenergization of the private magnet 22 the relay 25 is connected in bridge of the conductors leading to the wipers 16 and 17 and as these wipers are included in the talking sides of the calling line the relay 25 is energized owing to the connection established between the line sides by the switch hook at the calling station. The lower grounded armature switch of. the relay 25 now establishes a circuit through the rotary magnet 26, the'sluggishly operatin relay 27, the side switch wiper 28 in its first position, to the grounded battery 10. The rotary magnet 26 causes the wipers 29, 30, 31 and 32 to turn step by step until the wiper 31 engages an ungrounded waiting contact whereupon these wipers will be brought to rest owing to the denergization of the private magnet 33 whose circuit was established upon the initial operation of the rotary magnet 26, the private magnet 33, when. denergized, effecting the movement of the side switch wipers 34, 35 and 28 to their second and final positions in which the wiper 28 opens the circuit for the rotary magnet 26 allowing the wipers 29 to inclusiveto remain at rest with the wiper 31 engaging the nn-- grounded waiting contact. Similarly pos1- tioned waiting contacts of the wipers 29 and 30 are individual to an operator, there being as many operators as there are waiting contacts in each bank of the wipers 29 and 30. The waiting contacts of each operator selector switch is multiply related with similarly positioned waiting contacts or operator selector switches.

One link connector 8 has an operators telephone 'A terl'ninating in'the uppermost waiting contacts of the banks of watlting contacts of the wipers 29 and 30. The other link connector 8 has an operators telephone set Ii terminating in the next to the uppermost waiting contacts of the aforesaid banks of waiting contacts. The waiting contacts of the wiper 32 are similarly associated with signal receiving and recording devices C, D, which are individual to the operators positions. \Vhen the side switch wiper 34 is in its second position it engages a grounded waiting contact whereby ground is placed upon the wiper 31 so that the waiting con tacts of other switches that are in multiple with the waiting contacts engaged by the actuated wiper 31 are guar ed to prevent wipers of other switches similar to the actuated wiper 31 from resting upon such multiply related waiting contacts. When the side switch wiper35 is in its second po sition it esablishes a circuit traceable from the grounded battery 10. the relay 36, the left hand armature switch of this relay and gimme its normal follow up contact, the armature switch of release magnet 37 and its engaged contact, the side switch wiper 35 in it's second position and its engaged contact, the

wiper21 and its engaged Waiting contact,-

the segmental contact 8, the adjacent one of the four contact arms 39'that areadapted individuall to connect this segmental contact 38 wit the-uppermost of the adjacent row of waiting contacts (the segmental contact 38 and the uppermost one of'the adjacent row of waiting contacts being normally-connected by an arm 39), the uppermost armature switch of the relay 40 and its follow-npcontact, the winding of the relay 40, to ground. 1

Themechanism having the elements 38 and 39in the circuit just traced is individual to thecalling line, each telephone line havin a similar mechanism individual thereto. %Vhen the relay 36 was energized it established a locking circuit for itself traceable from the grounded battery 10 through the winding of the relay 36, the left hand armature switch of this relay and its now alterna'oe contact, to the two waiting contacts joined by the side switch wiper 34 in its second position and one of which contacts is grounded. When circuit is established through the relay 40 this relay establishes a locking circuit for itself traceable from the grounded terminal of this relay, its winding, its uppermost armature switch, the alternate contact of this armature switch, the normally closed switch 41, to the grounded battery 11). The initial circuit employed for energizing the relay 36 also established a circuit for the sluggishly operating relay 42 i which operates when the relay 40 operates. The,left hand armature switch of relay 42 closes the circuit of the restoring'magnet 43. The armature of the restoring magnet 43 is are shaped, the center of this are being co-incident with the axis of the pivot 44 of an arm 45 that carries said armature. The arm 45 has a relation to the toothed detents 46, 47 similar to the relation of the side switch arm governed by the private magnet in the mechanism illustrated upon page 530' of Van Deventers Telephonology. The detents 46 and 47 are operated by a magnet 48 having mechanical control of the detents 46 and 47 similar to the control had by the private magnet upon similar detents in the switch disclosed in Telephonolagy. The right hand armature switch of relay 42 temporarily opens the circuit of the magnet 48 to prevent its premature operation. The circuit of relay 40 having been closed and the relay 42 having been released in its time, circuit for the magnet 48 is closed at the right hand armature switch of relay 42. The circuit for this magnet 48 includes a circuit interrupting device later to be described in connection with Fig. 2 whereby the-mag net 48'is, intermittently energized to cause the step by step rotary movement of the armature of magnet 43 in its lane a'swill bewell understood by those amiliar' with this type of ap aratus.

As illustrate the circuitof magnet 48 is interrupted five times and in the last step the contacts of switch 41 are separated to open the locking circuit of the magnet 40 whereby the circuit of the relay 48 is opened at the lower armature switch of relay 40, whereby the operation of the magnet 48 ceases. \Vhen the magnet 48 was previously intermittently operated its grounded armature intermittently engaged its contact intermittently to close circuit through the motor magnet 49 to operate the ratchet wheel 50, the ratchet wheel being fixed upon a shaft upon which in turn the arms 39 pertaining to all of the lines of a group are fixed, whereby the arms 39 which were engaged-with the uppermost contacts of their associated banks of waiting contacts are stepped off of these contacts into engagement with succeeding contacts, such arms 39 continuin their movements until they step off of their associated banks of waiting contacts. the arms 39 having been 3 moved in counter clockwise'directions. Thus s the element 50 and the elements 40 to 49 inclusive associated therewith are common to the lines of the group of one hundred telephone lines, while each element 38, the arms 39 and other parts associated therewith are individual. to each of the telephone lines of such group, the invention having for its object the provision of a motive apparatus common to the telephone lines for o crating devices individual to the telephone ines for the general purpose of the system.

The devices havin the elements 38, 39 and pertaining to a part cular calli-n line is the only device which will operate or effecting circuit changes, the arms 39 of other devices mechanically coupled with the arms 39 associated with the calling line being. temporarily ineffective when other lines of the group are calling owing to the opening of the circuits of relays 36 of other line seeking switches of that group at the associate segments 38 from which the associate arms 39 have been stepped. v

In a manner to be described the second waiting contact engaged by an arm 39 is employed for furnishing the selected operator with the first digit of the number of the calling line, the next waiting contact with the second digit of suchnumber, the third waiting contact with the third digit of such number. and the fourth waiting contact with the fourth digit of such number. The arm45 of the magnet 43 remains in its ofi" normal position in which it separates the contactsiof the switch 41 until tlie'next calling lin'eseeks the employment efthe motor m'a'gn'eti49, on

which account the relay 42 is provided with Ill? an intermediate armature switch which serves temporarily to close the locking circuit for the relay 40 (this locking circurhnow being open at 41) until the magnet 43 has had its. restoring movement started, a single closure for the circuit of the restoring magnet 43 at the left hand armature switch of relay 42 being sufficient to cause the arm 45 to be restored to normal, all as will be well understood by those skilled in the art.

Having now described the use of switches common to a plurality of lines that are adapted to seek and attend: calling linesand having 'enerally described the switches employed or selecting idle operators and idle signal receivers C D belonging to such operators, I will now describe the manner in which the acti e instrument having the elements 3S and 39 coiiperates with the elements 20, 36 and and apparatus to be described for operating the signal receivers for the purpose of informing the selected operator of the number or designation of the calling line 1-,

In Fig. 2 I have shown two well known ticker recorders which may be employed in practising the invention, each recorder being illustrated as belonging to an operators position within range of the operators atthese positions. Each recording signal instrument illustrated includes apolarized magnet 51 whose armature oscillates the well known ratchet wheel actuating device 52,the ratchet wheel 53 which is, actuated being fixed upon a shaft 54 that carries a printing wheel 55 provided with printing characters, the said shaft also carrying a weighted pulley 56 for turning the shaft when it is permitted to turn by the operation of themagnet 51. The equipment also includes a printing magnet 57 whose armature presses a paper tape 58 against the printing wheel 55 when printing is to be effected. The periphery of the printing wheel 55 is inked by an inking roller 59. The paper tape is fed in any suitable way familiar to those skilled in the art.

Direct currents of opposite polarity are applied alternately to the winding of the polarized magnets 51 whereby the shafts 54 are continuously kept in rotary stepping movement, the shafts 54 being turned step by step in order that the printing characters upon the faces of the printing wheels may be properly presented to the tape. I have shown a source of grounded direct currentfor impressing current of positive polarity upon the magnets 51 and a source of grounded direct current 61 for impressing current of negative polarity upon the magnets 51. The positive and ncat ve terminals. respectively, of the source; of current 60 and 61 are connected by crushes with disks 62, 63 that are fixedly mounted upon an insulated shaft 64 driven by a .otor 65. .These disksare provided of the shaft 64. Circuit with metallic continuations 66 which are flush with sections of insulating material 67. Brushes 68, 69 are successively engaged by the projections 66, the engagement between one brush and each finger 66 of one disk be ing followed 30 later by engagement between the other brush and a finger 66 of the other disk. The brushes 68 and 69 constitute multipled terminals of each polarized magnet 51, the other terminal of each of these magnets being grounded. Two of the fin-- gers or projections 66 upon each disk 62, 63 are spaced 120 apart and the remaining fingers or projections are spaced 60 apart, there thus being five such fingers to each disk. Each disk thus causes the energization of each magnet 51 five times in each disk revolution, each of the five energizations occasioned by one disk being followed 30 later by the energization of the magnets 51 effected by the other disk. As these disks direct positive and negative current respectively to the polarized magnets 51 the armature-s of these magnets have five complete oscillations for each revolution of the shaft 64. The shaft 54 thus has eight periods of 'rest that prevail throughout substantially 30 of rotation of the shaft 64 and two periods of rest that prevail substantially throughout 60 of rotation of the shaft 64, the shaft- 54 thus having ten periods of rest during each revolution of the shaft 64. The equipment having the elements 51 to 69, inclusive, is well known by those skilled in the art. The shaft 64 carries a disk 70 that has electrical connection with a brush 71 but once durin each revolution aving been previously partially established at the lower armature switch of relay 40 for the magnet 48 controlling motor magnet 49, circuit for this magnet 48 is completed once on each revolution of the shaft 64 so that the wheel '50 is stepped around. The shaft of wheel brushes 68 and 69 are between the most widely separated fingers 66 of the disks 62 and 63, whereby ample opportunity is afforded f0! 5 epping the wipers 39 from contact buttons to contact buttons. The

shaft 64 also carries ten disks 72, 73, 74, '75,

76, 77, 78, 79, 80 and 81 that are respectively engaged by brushes 72 73 74, 75. 76 77 78 79 80 and 81 once upon each revolution of the shaft 64. The first disk 72 anegiaa 7-2 45 after the disk'70 nections for 71 and so on throughout 1 brushes 39.

the waiting contacts of the The wiper 39 individual to each line is included in circuit connection g with the selected printing magnet 57 by nected with one terminal of the grounded battery 10 during the time that the printing wheels 55 are at rest.

means of the wipers 20 and 32, one terminal or each printing .inagnet being grounded while the other. terminal of each printing The magnet 57 depends for its connection 5 switches, each selector switch having a wait:

with the battery 10 upon the waiting contacts swept over by the-active arm 39, segmental contact 38 the wiper 20 and its engaged waiting contact, the right hand arina i ture switch of relay 36, the switch -36, the wiper 32 and its engaged contact, this latter contact being connected with the magnet 57 of the selected receiver.

The peripheries of the printing wheels,

tor the purpose of my present invention, are

provided with printing characters in the form of digits. The brush 72 is connected with the battery 10 when the printing wheels 55 are presenting digits 1 to thetapes 58; the brush 73 is connected with the battery 10 when the printing wheels 55 are presenting digits 2 to the tapes 58; the brush 74 is connected with the battery 10 when the printing wheels are presenting digits 3 to the tapes 58, and so on, brushes 75 76 77, 78, 79, S0 and-81 being, respectively connected with the battery 10 when the printing wheels are presenting the digits 4, 5, 6. 7, 8, 9, and 0 to the tapes 58,

magnet is inultipled in the diiferent selector ing contact for its wiper 32 that belongs but one printing magnet.

By the equipment which has been described the number of the calling line is printed upon the tape 58 of the selected printing magnet 57, this operation being preferably performed within view of the operator whose telephone set has been antomatically selected by the calling subscriber and which selected operator depresses her listening key 82 to bring-her telephone set into circuit with the talking wipers 16, 17, 2-9 and 30 and thereby into circuit with the calling line to ascertain from the calling subscriber the number of the desired line whereafter the operator may, by any suitable or preferredmeans connect the calling and cailed lines.

I have shown well known cord connect- '1 ing equipment 8 and wellknown multiple jack structures 7 whereby 'callihgaiid called lines may be connected" and as this equips ment is well understood by those skilled in Each telephone line is provided with as 1 many waiting contacts for its wiper 39 as there are digits in the number assigned to such telephone line. These waiting contacts are connected with those of the brushes 72to 81, inclusive, that are connected with the battery 10 when the digits of the printing wheels 55 corresponding to calling lines are presented to the tape 58 belonging to ,the selected printing magnet 57, the magnets 57 constituting the portions of the signal receiving equipments that are selectively associated with the lines so that the tapesbelonging thereto may receive record of the different calling lines that have selected the printing magnets pertaining thereto. Thus in the case of telephone station 1357 the next 'to the top button is connected with brush 7 2 the next button is connected with brush 74, the next button is connected with thebrush 76 and the bottom button is connected with the brush 78 In the case of station 1358, the connections are the same with the exception that the bottom button of the wipers 38 individual to station 1358 is connected with the brush 79 Thus there are provided means individual to the lines and which differ from each other for-causing the signalreceivers to give characteristic signals peculiar to the lines, thedi'lferentiation between the means, in the the art further description thereofwill not be necessary excepting to state that the wipers 39 of the calling line remain at rest 3 with one of these wipers engaging the con. ftact 38 and the topmost contact of the as- I sociate bank of contacts, preparatory to the initiation of a late-r or new call by this calling subscriber. \Vhen the jack of a calling. line receives a plug, circuit-is established through the cutoff relay 6 in a well known manner, as a consequence of which the circuit of relay 25 is pened to open the cir-. cuit of the sluggish relay 83. The left/ hand armature switch of the released relay 83 es I tablishes a circuit traceable from its grounded contact, the armature switch engaging this -contact, the previously closed off normal switch-84, therestoring magnet 85, to the grounded battery 10. The restoring magnet effects the registration of the wipers 16 to 21 inclusive and the side switch wipers 15, 23 and 24 to normal during the period that the magnet 85 is energized, its armature switch maintainin the circuit for the relay 12 which was 0 osed when the side switch wiper 15 was placed in its second position. The armature switch of the relays 12' of the four line seeking switches belonging to each group of one hundred lines are serially related with'each other by way of-their alternate contacts and are also connected with the alternate contacts of the line relay 11 of the particular the fourth switch will seek a calling line.

In the restoring operation, the maintenance of the circuit for the relay 12 at the armature switch of the restoring magnet 85 prevents the switch which is being restored from having its restoring function interrupted in the event of another call being initiated during the period of restoration.

The right hand armature switch of the deenergized relay 83 establishesa circuit for the restoring magnet 37 by way of the previously closed oil" normal switch 85 whereby the wipers 29 to 32 inclusive and the side switch wipers 28, 34 and 35 are restored to normal. To prevent the transmitted numher from "being repeated in connection with the same call, in the event of another call in the same group being initiated prior to the release of the line hunting and signal selecting switches, I open the circuit including the wiper 32 and the selected magnet '57 when the printing operation has been performed. To this end I place a driving magnet 86 in connection with the wiper 32 and in multiple 'of the selected printing magnet 57.

Eachtime the printing magnet is operated the driving magnet is operatedto'turn the ratchet wheel 87 one-step. -When the ratchet wheel 87 has been turned four steps the finger- 88 carried thereby opens the switch '36 entirely to openthe circuit leading to the segment 38 of the calling line. When the selector switches are restored circuit for the restoring magnet89 is closed at the right hand armature switch of relay 83 whereby the ratchet wheel 87 will be restored to normal, it having a restoring spring ,for the purpose. When the wiper is restored to normal the locking circuit of the relay 36 is opened and thereuponthe entire equipment is restored to normal.

While I have herein shown and particularly described the preferred embodiment of my invention I do not wish to be limited to the precise details ofco struction and circuit arrangement show: as changes may readily be made withou departing from the spirit of the invention, out

Having thus (lBSQX'lEQ-fid my invention I claim as new anddesire to secure by Letters Patent the following 1. A signaling system including a plurality of signaling lines; signal receivers; selector, switches for; selecting signal re ceivers that are free for selection and assoand means common to the lines and.

nal receivers that are free for selection and asscciating the same with signaling lines; means individual to the lines and which differ from each other for causing said signal receivers to give characteristic signals peculiar to the lines; and means common to the lines and governed at the signaling ends thereof for eli'ecting the operation of the aforesaid means. a

3. A signaling system including a plurality of signaling lines; signal receivers; selector switches for selecting signal receiv ers that are free for selection and associat ing'the same with signaling lines; means in dividual to the lines and which differ from each other for causing said signal receivers to give characteristic signals peculiar? to the lines; a plurality of circuits for effecting successive operations of each signal receiver;

means associated with the selected, signalreceiver by the operated selector switch for establishing the signal receiver controlling,

circuits in succession through the selected signal receiver; and means common toithe lines for eiiecting the operation of the iirst selected signal receiver; and means common to toe lines f r efiecting the operation of the first afore: means.

In witness my name thi. vemher A. 1)., 1819..

MC'RTU QZ' L. JGHNSON.

Witnesses:

E. L. WHITE,

L. Canoe.

iereof, I hereunto subscribed, twentyseventh day. of \o:

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