USRE13989E - Tings - Google Patents

Description

- R. G. M. HASTINGS.

SELECTIVE SYSTEM OF TELEPHONY.

I APPucAnbN rguzo MAY8;1915. Reissued Sept. 28, 1915.

5 SHEETSSHEET L -R. C. MQHASTINGS. SELECTIVE SYSTEM OF TELEPHONY.

v I APP! .|CAT!0N FILED MAY 8, I915. Belssued Sept. 28, 1915.

@ffozuct m0; M. HASTINGS. SELECTIVESYSTEM 0F TELEPHONY.

APPLICATION FILED MAYfl, 1915. Relssued Sept. 28, 1915. 1 3,989.

5 shins-SHEET s.

R C .M HASHNGS SELECTIVE S YSTEMDF TELEPHONY. 'APPu'cAnqN FILED MAY 81 Reissued Sept:- 28, 1915.

ated by the removal of the jack plug, and all sub-stations placed again upon the line UNITED STATES PATENT OFFICE.

RUB EN C. M. HASTINGS, 0F COLUMBUS, OHIO, ASSIGNOR TO THE INTERNATIONAL TELEPHONE (30., OF COLUMBUS, OHIO. I

SELECTIVE SYSTEM OF TELEPHONY Original No. 1,061,285, dated May 13, 1913,

To all whom it may concern a selective system of telephony, and the primary object of the invention is the provision of a telephone system, employing an exchange or central station and a series of sub-stations, the same hereaftenbeing illustrated as connected for operation 1n series in What is termed a loop circuit, there.

being mounted in the exchange station a selecting apparatus, whereby the operator when called, operates the apparatus to connect the calling sub-station to a called sub-- station, simultaneously locking out all other sub-stations, and shunting their outfit, so

that their transmitters and receivers are dead, the circuits being shunted, so that said locked out subscribers cannot interfere with the parties talking, and cannot themselves call the exchange station until such parties have completed their conversationand hung up therespective receivers and rung 01f; at wlnch time the selecting apparatus in the exchange 18 automatically operin condition for calling the exchange station or themselves being called. In systems ot this character, it is generally the common.

practice. of subscribers whether called or not, but when any neighboring subscriber has been called, to be curiousand-break-in upon the conversation and thereby render the service unsatisfactory for all parties concerned, the manipulation of the various receiver. hooks by the curious subscribers causing a great loss to the company on account of the battery consumption, and further requiring the employment of call bells of greatresistance, as all of the bells must be operated each time any one of the subscribers is called. 'lth th s particular apparatus and system, all of the curious sunscribers instruments are shunted or'dcad 1 during the connection of the calling and called sub-stations. thus cutting out the local battery force. and by reason of the't'aet that the. only hell or siglml actuated 1s the-one at Specification of Reissued Letters Patent. Reissue S pt 28 1915 Serial No. 646,697. Serial No. 26,914.

Application for reissue filed INlZay 8, 1915.

and called sub-stations, so that the other' sub-stations may obtain service. -In other Words, with a system designed according to the present nvention anynumber of substations may be placed in series upon a commonline, madein the form of a loop circuit,

although it is-to be understood that any system may be employed, the loop circuit,

however, being a more economical circuit,-

and one which does not so readily become ineffective, in case of breaks occasioned by storms. V

In using the present system, the calling subscriber notifies the exchange station in the usual manner that he desires'colnmunication with another substation. The exchange operator answers such subscriber and after being given thenumber of the sub-station with which 'it is desired to have. communication. the exchange operator rotates a shaft of the selecting apparatus, the indicator thereon indicating'all of the: various numbers at that exchange station and upon the particular loop circuit. \Vhen the exchange operator has gmanipulatedthe shaft-to such number. the shaft is p. shed upon, this action SlIHUltzIHQOUSl'Y placingthe called substation in direct connection with the calling substation, and automatically ringing the called substation alarm, and only such alarm. the various other substations havingbeen shunted or caused to be 'dead with relation to the line circuit, so 'even though should they endeavor to get the exchange station or listen: to the conversation, they can neither transmit or receive or signal the exchange, station.

the exchange operator without afiectingthe main selectingkey, operates an auxiliary desubscriber that the called subscriber does not answer. Upon the completion of the conversation between the called and calling sub- Should the called SHbSCI'IbGI not answ ,mmedmtdy v lated, the exchange operator removing the j ack plug and thus simultaneously releasing.

the selecting device so that all. substations are connected to the line with the shunts open. It will thus be seen that by producing a. system operating as described, that a' greater annoyance to the conversing sub scribers 1S dispensed with and overcome, and

that by'reason of the automatic shunting ofall instruments, but the calling and called substations, that a great saving to the company or system is the result.

A still furtherobject of this invention is the employment of a novel form of selecting apparatus, and automatic substation instru; ments cut or lock out herein set forth to produce an operative system.

With the foregoing and other objects in I view which will appear as the descriptionof the invention proceeds, the invention resides in the combination and arrangement "of parts and in the details of construction herelnafter described and claimed, it being understood that changes in the precise embodiment of the invention herein'disclosed can be made within the scope oflwhat claimed without departing from the spiritof the invention.

In the drawings: Figure 1 is a diagram mat-ic view of a single substation and the exchange station as employed with thepresent invention, the loop circuit being shown. Fig. 2 is a detail side elevation of the selecting apparatus in initial position. Fig. 3 is a similar view with the parts in the position they assume after having called a substation and shunted the ones not called. Fig. 4 is a detail front elevationof a substation shunt mechanism in line open position. Fig. 5 is a similar view shunted, the receiver being ofl the hook. Fig. 6 is a rear view of the substation shunt mechanism. Fig. 7 is a. side elevation taken from the opposite side of the selecting key of Fig. 2, the parts being in the same initial position. Fig. 8 is a detail plan view of the hook lock shunt disk and its pawl. Fig. 9 is a vertical longitudinal sectional view through the selecting key. Fig. 10 is a top plan view of the mechanism below the selecting cylinder. F ig. 11 is a front elevation of the key with the cap removed to show the gearing and clutch. Fig. 12 is a section taken on line 12-12 of Fig. 9. Fig. 13 is a detail view of the selectingkey control armature.

Referring to the drawings, L and L designate the line conductors of a loop circuit, E the exchange or centr al station, and S one substation, both the exchangestation and substation being connected to the loop circuit for the electrical transmission of intelligence. I I

The various detail circuits as shown in Fig. 1 will be described later on in connection with the apparatus.

The exchange station comprises essentially, the call-up magneto M, the two jack plugs v J, J and the co-acting jack socket 1, for one plug J, and the series of coacting jack sockets 2, for the other jack plug J. The exchange station visual signal device S is mounted also at the exchange station, while the selecting key K is also mounted therein, and as set forth in detail later on controls the electrical communication between two and only twosubstations, the one calling asking the exchange stationto select the one called, whereby the manipulation of the selecting key K by the exchange operator, places in telephonic communication the calling and called substation, and simultaneously shunts all of the remaining substations, simultaneously advising them by visual signal that the line is busy or in use.

The substation :5, only one here being shown, it being understood that any number may be connected in the loop circuit, com

prises essentially the receiver R and the transmitter T, a call-up and a ring-off magneto M and also mounted in proper circuit the synchronously operated lock out and shunting device 0, the detail description of which will follow later on. The device 0 is provided with means operated automatically by the selecting key K at the exchange station to either place the receiver and transmitter into electrical communication in the loop circuit, or to shunt them so that they are dead on the line, and cannot in any way by the manipulation of the ma eto h with systems now in use. This much per tains generally to the system, but-inorder to fullyunderstand the operat on of the same, the various instrumentahties that render this system possible must be considered, and

each will be considered separately, and then finally associated with the diagram as shown in Fig. 1 to fully set forth .their respective .uses.

Selecting keg .The selecting key, which is particularly set forth in detail in Figs.- 2, 7, 9, 10,11, 1:2 and 13, and in diagram in Fig. l, and which is mounted'for opera;

tion atthe exchange station, comprises an open frame 2' and the four cylindrical gruding and supporting rods 3, 4C, 5 and 6, re-

"or the continued movement of the receiver hook annoy the parties in communication,

spoctivcly, upon which are mounted the respective parts of the key. Mounted for tral ,tnbular portion 8, which forms the mounting for the carriage upon the rod 3. The coiled spring 3 is-mounted upon said rod 3 and exerts a tension to normally move the carriage toward initial position or as viewed in Fig. 2, toward the left. Depending below and parallel to the portion 8, is a plate 9 provided with rack teeth 10,- which at all times mesh with the actuating toothed wheel 11. being upon a sleeve .11, said wheel being rotatably mounted upon the shaft 12 journaled transversely of the frame,

between the two plates 13 and 14, which form in reality a casing. Projecting JAP- wardly from and at each end of the tube 8,

are two arms 15, which are provided with eyed terminals 16, which slidably fit upon the rod 4, and have disposed therebetween and upon the rotatable rod 4 the selecting cylinder or drum 17, which is keyed slidablv I upon the rod or shaft 4, so that said cylinder may slide upon the rod or shaft 4 and yet be caused to rotate therewith, the purpose of which will. presently appear.

By carefully examining the selecting cylinder or drum 17, it will be noted that the forward portion of the periphery thereof, is provided with a series of longitudinal grooves 18, spaced apart at equidistanees around the cylinder, each groove representing one substation and the exchange station in the system, there therefore being when eleven substations comprise the system, twelve grooves 18, the outer end of the shaft or rod 4. asat 19, carrying an indicator or pointer to indicate by pointing to a numher on the dial (not shown) the substation that will he placed in communication by the proper manipulation of the key. The outer I ends of the grooves 18 terminate in the c1rcumferential groove 22. which when the selecting cylinder is in initiahposition as in Fig. 2, will have the locking pin or screw 23, mounted in the frame above the cylinder, fitting therein to prevent the movement of the' cylinder accidentally and. yet permit the cylinder to be pushed inwardly to connecting position. as shown in Fig. 3 through the rotation for selecting and the pushing in wardly of the: operating rod 24. The rod 24 is provided with a key way which permits said push rod to be rotated freely to the right, but when turned to the left throws in the pawl and ratchet device 26, shwwn in Fig.11, so that the shaft 24 through the gear 29, small pinion and are otatably mounted the short sleeves 11' stitutes the selecting key carriage and cylinder controlling sleeve. By this arrangement when the pointer alines with any one of the dial figures, the push rod .24 is pushed inwardly. so as to slide upon the central guide rod 5, upon which is slidably mounted the main actuating rack or tooth bar 32, whose toothed portions is in mesh at all times with the gear 33. k 4

The inward movement of the bar 32 rotates the sleeve 11", and as the call alarm actuating frame 35 is simultaneously pushed inwardly, the toothed portion or rack 34 thereof rotates the sleeve 11' through the small gear 34. The large gears 33' and 34 are a portion of a locking and releasing mechanism for the, control and release of.

the respective racks 10, 32 and 34, the electromagnet 56 and its Y-shaped armature 51, as will presently appear, constituting the main contrpl-device-for permitting 'the return to initial position. of the racks 10, 32

and 34 and for the retention thereof in selected p'osition. At the forward end of the frame 35, are thetwo lugs.36 and 37, the

'lug 37 is engaged and the frame 35 is moved inwardly with the carriage of the key, but after the carriage is in selected posit-ion and is locked, the, frame 35, due to the spring '44, is automatically returned to initial position, and during such return, as will presently appear, automatically causes the energization of the callup alarm 200 in a selected substation. If the selected substation requires successive calling, the auxiliary push rod 38 is depressed, engaging the lug 36 and pushing only the frame 35, which t after having been released will be again automatically returned by the spring 44 and will ring the alarm 200 in the selected substation. I

Journaled between the plates 13 and 14 and to theright of the shaft 12, as viewed in Figs. 2. 3, Sand 10. is a shaft 45 having rotatable thereon the two gears46 and 4'1, which are at all times in meshwith the respective large gears 33 and 34"! Fast With the gear 46 is a. toothed wheel 46, While fast with the gear 47is a toothed wheel 47. The respective pivotal'ly mounted governor arms 48 and .49, carry the respective double detents or 'pawls 48' and 49, which engage their respective, toothed wheelsei" and 46', such arms and the train of gears constituting the full locking and releasing mechanism for the frames 9, 32 and 35.

' As the manipulation of the carriage and selecting cylinder makes the selection and line connection, it is desirable that the frame 35 be held stationary during the spring.

actuation or movement ofthe same, and vice versa, that is that the carriage'Xand selecting cylinder belocked While the frame 35 is being automatically actuated to actuate the call-up mechanism of the selected substa tion; and to accomplish this, a very simple, yet, efiective device is employed. This consists primarily of the pin 50, mounted in the main frame centrally of the bottom thereof and to the right as viewed in Figs. 2,, 3 and '9, and having pivoted at its top a Y shaped armature 51 having the terminals 52, 53

I and 54.

The terminal 52 is disposed to move above the governor arm 48, While the terminal 53 is disposed to move above the governor arm 49, this action alternating, so that one governor arm is'held against movement, While the other is released. This is accomplished by the spring 57 and the electromagnet 56.

Thus the energization of the electromagnet 56, will act in. opposition to the spring 57 to attract the armature 54, and consequently move the terminal 59. into engagement With the governor arnietS, While the terminal 53 will be moved from above and out of engagement With the governor arm 49.

When the exchange operator is making a selection, and the push rod 24 has been pushedin toits fullest limit and released,

the contact 66 due to the engagement there-' of is closed by-the cylinder 17 and consequently the elecromagneti56is energized. ll'his energization of the electromagnet 56 as hove stated attracts the armature 54 and places the terminal 52 into engagement with the governor arm 48, while the terminal 52 is moved from engagement with the governor arm 49, the gdvernor' arm "i9 being free to move and consequently permits the retraction of the carriage and cylinder 1'7 to the selected position, at which time the contact 66 due to the shouldered portion 63.

of the cylinder -l7 is caused to separate and open the circuit to the electromagnet 56,

such deenergization releasing the armature M to the action of thespring 57, so that the terminals 52 and 53 are reversed, the terminal 52 being disengaged from the arm 48 While the terminal 53 is placed in engagement with the arm $9. This action releases (the bell ringer frame 35 so that the arm 59 is moved to close the contacts and 166- to thus automatically actuate the audible alarm in the called substation.

Disposed near the clectromagnet 56 are proper end 60 or notch 61, and to be closed when in between.

Mount-ed upon the enlarged portion of and exteriorly of the cylinder 17, beyond the circumferential groove 2-2 thereof, are the studsor pinsv 62, one to each longitudinal groove 18 ofthe cylinder, and formed upon the extreme inner end of the cylinder are the staggered shoulders 63, one to each pin 62 and groove 18, andeach in line with its respective pin and groove. The ribs 64 formed by these series of longitudinal grooves 18 in the cylinder are each provided with a series;

aof teeth, one to each subscriber. All of the teeth are cut in circumferential, aline ment, said teeth forming a circuit making and breaking to operate theshuntingdevices in the system, the coacting spring contact terminal 65 being disposed to engage the teeth of one rib at a time, as shown in Fig. 3,

and the specific purposes of which Will be setforth' in the operation later on. Dis

posed in the path of the staggeredshoulders I 63 of the selecting cylinder. is another-pair otcoacting'spring terminals 66. Aconductor 67, through the conductor 138, battery 139, conductor 1&0, electromagnetfifi, and

inc

conductor la 'O connects one terminal of the pair of contacts to the electromagnet 56,

another connector 141 being branched from the conductor 14,0 and connected to one terminal ofthe ,other pair of terminals 68, which are disposed upon the plate let, and

purpose of Whi ,i will presently appear.

Connected to the top of the franiejof the key is a bracket 69, whose hooked lug 70 v projects downwardly and in the path to engage between the pins 62, and insure upon the extreme inward movement of the selecting cylinder, the proper reglstering of the longitudinal grooves with the locking and more screw or am 23 thus insurirk the the' path to be closed and opciied by the actuation of the late 9 of the carriage, the v proper registering of the cylinder in case the pointer" did not exactly point to the dial number when the operator pushed the rod 24. 1

The pawl P is properly carried by the frame and has its engaging .end disposed to ride in one longitudinal groove 18 or engage one set or row of teeth mat a time, the

spring p holding the same toward the cylinder li at all times. This pawl P is so disposed as to pernnt the cylinder 17 move- 'ment toward initial position when in engagement with the teeth a, but prevents the -which carries thereon the shunt or receiver hook lock disk 7i, provided with the series of pins 7 5, which correspond in number to the grooves 18 in the selecting cylinder 17,

- said pins forming operating means to control the receiver hook 117 for the shunt connections, as will presently appear. It is to be understood that although pins 75 are here shown, that grooves, or other projections may be "used, and that there must be as many I pins as' there are figures on the dial of the selectingkey. The pins 75 control the pawl 77, which is secured to the plate 71, by any well known means, and is provided at one end with the spring 78, which is adapted to contact the pin 75, to raise the pawl 77 from engagement with the notch of the receiver hook lock or shunt controller 79, which is formed in two parts or arms 80 and 81' and is secured to the plate 71 by the'post 82. Secured to the controller 79, is an armature 83, said armature being provided to release the part 81 to locking position. Carried by the part of the controller, is a pin 84, and a notch 85, which is adapted to receive the pawl 77, so that the controller may be looked and thus hold the receiver hook in shunted position.

By the rotation of the plate or disk 7 1, the-pawl is actuated to be raised or lowered from engagement with the notch 85, thus when the line is free, the pawl is out of engagement or when -the substation is called, but when two substations are'in communication, the pawl 77 of the remaining substations are each in its-respective notch 85 of the controller and the line is ?dead to them, as their transmitters and receivers are shunted from the line.

Mounted through a slot 86 in the plate 71 and upon the opposite side to the contrplfier, is a Wei ht 87, which is connected to the res endjof t e hurt or arm 81, and which when thecontrol r'is lifted, the pawl 7 7 being disengaged therefrom, and the electromagnet'fifl bein energized, attracting the armat'ure 83 an pulling it outwardly so that its "lower end is disengaged from the weighted and 0f the mrt or arm 81, Wlll cause the arm 81 ,to an by gravity and engage the 3 pair" of terminals 134-435," shunting the transmitter and receiver of this set from the iUUf) circuit, and atthe same time uponingth'e line of the transmitter and receiver to the battery, this particular action taking Mfr proper rotation, is the bell crank lever pawl .wheel and at the same time act as a slight place when a party has rung into the exchange station and another party has just beaten them there, thus providing a means should a receiver be taken off or be oif at that instant, that the exchange operator may 70 select theicalled substation and place the calling substation in the proper line connection, shunting the substation whose receiver is off the hook. The main shaft 73 also carries two ratchet wheels 90 and 91, respectively, one of which is an actuating ratchet and the other of,which' is a retrograde movement preventing ratchet, and

disposed to operate upon these 'ratchetlto impart to the shaft 73 and the disk 74 the 92, which is pivoted to the arm 72of the auxiliary plate 72,and 'has pivoted to its upper free end the pawl 93, the pawl 93 operating'to rotate the shaft and disk, while the pawl 92' operates to prevent its moving too far or retrograding. In order to prevent the retrograde movement of the shaft 73 whenithe pawl 93 has been partly moved to grip a new .tooth of the ratchet wheel, the member 92 being not yet engaged with said ratchet wheel, a spring 73 is provided, as

clearly shown in Figs. 4, 5 and 8, said spring 73 being disposed to engage the ratchet retarding means to prevent the over-running action of the'shaft 73 in the desired direction. Inorder to operate these two pawls simultaneously to operate the shaft, an armature 94. is connected to the end of the pawl 10 0 92 at its connection with the pawl 93, so'that the energizing ofthe electromagnet 95 will pull. upon the pawl 93 and cause the pawl.- 92 to be pushed and. lifted, the pawl 93 en-- gaging theratchet 90 to rotate the shaft, and the pawl 92 engaging the ratchet 91 to prevent the shaft moving too far or retrograding, a spring 96 being employed to re turn the pawls upon the ,deenergization of the magnet 95. the contacts 6565 by the teeth a upon the selecting cylinder", the electromagnets 101 and 95 are energized, as will later appear, and the shaft 73 and disk 74 are operated in synohronism or in step with the movement 5...

of the teeth a and thus the selected substation is permitted a line connection, and the remaining receivers and transmitters are shunted from the line, and are dead.

The electromagnet 95 is energized by'a storage battery B while the electromagnet 101 is energized by the main transmlssion battery 111, but as herein shown, the electromagnet 95 is controlled through the contacts 129 and 130, controlled by the main electromagnet or relay 101, disposed upon the rear of the plate 71 and connected in the talking circuit, the energizing of the electromagnet 101 closing the contacts 129 and .130 and closing the battery circuit-0f the battery B By making and breaking 110 p to energize the electromagnet 95 and operate the shunting and lock-out mechanism.

The shaft 73 further carries a disk 102 having a set of peripheral pins 103, here shown three in number, and-a set of outwardly projecting facial pins 104, which are six in number and are disposed inter mediate of the respective peripheral pins 1033 The pins 103v are employed to operate the circuit containing the electromagnet 88 through the spring terminal contacts 105, while the pins 104 are adapted .to engage and operate the spring terminal contacts 106 which when closed form a shunt circuit with the call-up alarm 200. The contacts 105 provide an auxiliary means for energizingthe electromagnet 88, to release the arm 81, to produce a shunt and open the local battery cirtuitfshorild the subscriber neglect to hang upfhis receiver after his conversation is ended.

t In order to provide a visual signal or indicator to advise the subscriber that the line is free or busy, there is mounted upon the extreme end of the shaft 73 and in view of the subscriber a signal disk 107, Which is provided with three series of two colored" portions 108 and 109, as shown in Figs. 4

and 5, a red color indicating busy and white free. 13 this means the subscriber may be notified when he may-expect to get theexchange station for communication, or

even in the event that he shouldhave taken the receiver oil of the hook, during the selecting of' a called substation by the exchange station, or the receiver was off the hook, the visual signal will indicate at a received and transmitter is shunted from the line and are in reality dead.

The operation of the systeom-To fully set forth the operation of the systein we will springs 66 are released and the e1ectromagsuppose that the calling subscriber has re quested the exchangeoperator for substation #5. The operator nowrotates the push rod 24 to the left, operatingthe pawl and ratchet clutch so that the selecting cylinder is rotated, and when the'dial indicates #5, the rod 24 is ready to be'pushe d upon. The rod 24 is now pushed upon carrying with it the carriage and selecting cylinder and also the ringer frame 35,.the electromagnet 56 now-being energized due'to the closure of the springs 66' by the carriage, the armature is attracted against the spring 57, so

that the terminal 52 is placed ,above the governor arm 48 and the framenn'is locked. Upon the release of the rod 24, however, the spring 3 returns the cylinder and carriage to selected position, at which point the net 56 is denergized, its armature being released to the spring 57. The terminal 52 is now disengaged from the governor arm 48, While the terminal 53 is placed in engage:

'when the staggered portion or the proper to separate, at which time, the circuit in- -electromagnet 56 is broken, and the electroengaging the terminal 53 with the governor arm 49,- so that the frame 35 is actuated by by the manipulation of the push rod 24, 7 due to the locking pawl P and its retaining ment with the governor arm 49, thus freeing the frame 35 to its spring 44, while-locking the gears 11 and 33 against movement and consequently holding the cylinder and carriage at selected position. During the movement of the carriage and cylinder, that is,

when the electromagnet 56 is energized and before its deenergization, the teeth a; and the contacts 65-65 are brought into play. This action causes the teeth a to actuate the contact 65 and thus energize the respective electroma'gnets 101 and 95, so that the shaft 7 3 in all of the substations are rotated, the carriage and selecting cylinder being halted shoulder 63 has permitted the terminals 66 cluding the battery 189, terminals 66 and.

magnet 56 is deenergizcd, permitting the spring 57 to pull the terminal 52 out of engagement with the governor arm 48, and

its spring and'ismoved to the opposite end of'the main frame ringing the call-up alarm 200 in the selected substation. Should the selected subscriber not reply at once, the exchangeoperator manipulates the auxiliary push rod 38 pushing in the frame 35,

which again when'released will act asaboye and either close the call-up circuit topermit a magneto M to operated to actuate the call-up alarm, or th'row into the line any well 1 now'ii call-up mechanism. By

this means it will be seen that the entire I selecting operation is controlled bythe-zeir- I glance that the line is busy and that the change operator and ,that the carriage and selecting cylinder will remain in this selected position, as shownin Fig. 3, and cannot be changed by the exchange operator spring 72, which is carried by the frame and disposed to engage the teeth as of the cylin- 1 'der, eithe'r by pushing or rotating as the selecting cylinder: is locked against further inward movement by the paWlP and against further rotation by means of the pin 23.

The only way it can possibly be changed is 1 by the removal of the jack plug J, at which time the electromagnet 56 is energized and the carriage governor arm 49 is released to permit the carriage and selecting cy liiider to return to initial position, Fig. 2- Should the subscribers impose upon the exchange operator, this action may be taken but as the exchange operator can hear the conversationaudtherefore knows when it is completed the jack plug .1 is removed and the various other substations are placed in line connection, the recession of the carriage and cylinder automatically operating the terminals 65 to actuate the lock out and shunting devices throughout the system, placing all are first pushed in, the

#5 and of teeth a disposed to aline with with the hook the pin 23. Thus line.

,0 d t H0, electroina gnet stations in condition to obtain the exchange station and operating the visual indicator to indicate such condition.

When the carriage and selecting cylinder teeth a are not in line with the contact terminal 65, but as the; pin 62 upon the cirmumt'erence of the selecting cylinder are engaged by the guide hook 70, depending from the main frame,

10 the selecting cylinder is given aslight turn,

so that the indicator would point halfway between the number selected and the next succeeding one, that is, the indicator would point half way-between #6, thus placing the teeth a in line with the terminal contacts 65 and the lockingpawl P so that any recession of the cylinder will actuate the contacts 65 to oper-. ate in synchronism the various lock-out and 20 shunting devices in the system, to be halted when the proper set or substation is in line connection and ready to be signaled. v

The selecting cylinder, when ready to be pushed in, has a space between two rows the lower end of the pin 23, said pin being of considerably less width than the space, while the spring actuatedpawl P, which is of substantially the same width as the space, is

0 also disposed in line with a space between two rows of the teeth a.

Thus when the cylinder is pushed in, it will be properly guided by the pawl P and when at the end of the stroke and the pin is engaged 70, the cylinder will have a slight rotation, imparted thereto, rotation placing a row of teeth (t in line to engage the pawl P, but not sufficiently far to move the space out of alinement with the pawl P will lock the cylinder against a further pushing movement, while the arm 53 will lock the arm 49 due to thespring '57 so that the cylinder is locked, against retraction. Thus 45 the exchange operator cannot by mistake change the talking circuit by attempting to move the selector through the movement of the push rod 24: so that any other, but the substation selected, may be thrown in the The selector cannot therefore be adjusted by the exchange operator either by mistake or wilfully. until the jack plug is removed and the carriage and selecting cylinder are returned to initial position. As

55 soon as the conversation .is thl'o :h, or central operator chooses totake' possession o the line, the jack plug J is removed from its socket, thuscompleting the circuit through the conductors (i7 and 138, battery 129, con- 56, andconductor 140'to the spring contacts 66, the electromagnet 56 being energized to release the czirrii g vand selecting cylinder release escapcmem bringing all instruments to line if #5 is selected,

connected to the suchslight J sorts, the jack plug J in the socket 2,

connected and the selecting instrument to initial or zero position.

In order that the various circuits may be traced in the diagram as illustrated in Fig 1, to demonstrate the full operation of the present system, although it is to be understood that other forms of circuits maybe employed with the present selecting key and lock-out device, the circuits will be traced in rotation or in their correct order beginning with the calling of the operator or the exchange station and the answering of such call by the operator, and to the final restoration of the various stations to the main line.

lVith the various instruments in the positions illustrated in Fig. 1, the contacts -435; are closed so that the signal S is line conductors L L through the respective conductors 170, 171 and 172, so that all substations are in calling-connection with the exchange station E. Thus the line will be connected so that the be called by any one receiver hook 117.

the calling substation de- Assuming that sires to converse with a subscriber, as for instance #5. the exchangeoperator now inthis action opening the contacts 2 2 Push rod 2a of'the selecting keyK is now rotated until the indicator indicates -#5, at which time the push rod is pushed uponL 'and during such action the contacts 66. due' to the engagement thereof with the enlarged por-- tion of the cylinder 17, are closed and be fore the release of the key actuating rod 2 1, a circuit is closed at 66 and includes one contact (36, the conductors 7 and 138, the

battery139, the conductor 1 :0, the electromagnet 56. the conductor 140 and the other with, the local battery 13 of th substation The contact frame 35 against release.

c 2 are held open by the jack 2o permits the same 35 spring 3 permits the spring 57 5 above the arm 4:9, and thus lock the arm 49 and carriage 7 lockcontact 66. energized place the arm 52 above and in; engagement with the arm 48 to lock the automatic ringer At the same time that the cylinder 17 and the frame 9 is moved inwardly, the normally open. contacts '68 ardengaged by the frame 9 and close it, but as contacts 2 2 of the socket plug J, the electromagnet 56, as will later appear, is not effected now by the contacts 68.

- As before stated, previous to the cylinder 17 --having reached its full limit of move- ;5 merit, the hook 70 engages the pin 72 and thus rotates the cylinder 17 to'bring a single row of teeth a in line with the pawl P, and

the pawl due to its spring p locks the cylinder against further inward movement and to retract to the selected tooth a of the row, while at the opposite side of the cylinder another row of teeth a is disposed to engage the contact 65 and thus close the talking circuit and intermittently open and close another circuit, as will presentlyfappear. When the contact 65 is in the depression between the teeth a the closure is made between the contact 65 and the terminal 65, While when the. contact 65 is riding upon one tooth a the contact is open at 65 and closed at 65, thus intermittently and alternately forming a talking connection and connecting the battery 111 to the line.

The release of the push rod 24, due to the moves the cylinder 17 and frame 9 toward the initial position, and as thecontacts 66 are closed by the'enla'rgcd portion of the cylinder 17, the circuit controlling the electromagnet 56 is energized until the 0 opening of said: contacts 56, due to the snapping of the contacts from one of the staggered portions63 of the cylinder 17. he opening of the circuit thus described,

to hold the cylinder 17 ing against further movement toward initial position. As the cylinder 17 is moved to ward initial position and before being stopped by the arm 53, the teeth a engaging the contacts 65 moves the same to intermittently close and open theconta'cts M265 and 65 and intermittently open 'andclo se the contacts at 65 and 65 65- 65. This action throws into the l ne the battery 111, so that the all of thersnbstati'ons chroously, to lock out variousshafft 73 in are operated syn 1'? as, the conductor 110, the battery 111, the

Thus the electromagnet 56'isqz and attracts the armature 51 to.

.- 134-135 and the conductor uncalled substation is substation is held to hold the arm 53 and. alternately and, intermittently open and close the contacts all uncalled substa- 9 f... nd place into line connection a single conductor 112, the line conductor L, the receiver hook 117-, the contact 118, the conductor 115, the "conductor 114, the two closed contacts 106106,the conductor 113 throngh the portion of the line L, Fig. 1, of the substation, the conductor 128, the electromagnet 101, the conductor 12S,

.and the line L, thus intermittently energizing the electromagnet 101 in all substations.

he energization of each electromagnet 101 operates the armature 101 in each substation and thus causes the contacts 129130 to intermittently close the circuit including the electromagnet 95 to each substation. Thiscircuit includes the contacts 129-130, the conductor .131, the electromagnet 95, the conductor 132, the battery B, and the co11- ductor Thus the intermittent energization of the electromagnet 95 in each sub station will operate the armature 94 to step the shaft 73 and the disk-102. The disk 103 in the uncalled substation will be moved to indicate red, if the line is busy. At this stage in each uncalled substation, the receiver hook is locked, and the uncalled substations shunted from the line by reason of the lever being lo'cked'in down position by the lock 77 engaging the notch 85. At the. same time, the contacts 134135 are closed by the lever 80 in such condition as to shunt the uncalled substation from the line LL through the conductor 136, contacts 137. As the uncalled substations receiver hooks are thus locked, it is impossible for the same to be released by lifting the receiver, and the conductor 136, the contacts 134-135 and the conductor 137 complete a shunt substation; The substation is thus shunted from the line. Also as the pin 104- in the out of contact with the contacts 106 the bell 200 in each uncalled inoperative and will not be afiectedas the bell 200 is actuated in the called substation. 1

When the cylinder 17 movement, due to the contacts 66 being open by slipping from engagement with the time, the arm 52 releases the arm 4C8 to the action of the spring 4 1, and'the spring 14: moves the call-up alarm frame 35 to initial position, so that the contacts 165166 controlled by the arm 59 ofinsulation open, due to the positioning of the ends of the contacts 165 in the recess 61 of the bar 69. Thus the movement of the frame 35 and the bar 59 will cause the loweredge of the bar 59 to ride-over and press the contact 165 to engage the contact 166 and thus throw into line the call-up machine M of the system. By this means-the call-up machine, which may be operated at'all times, or Whenydeas indicated in around the is stopped in itsare held sired, is thrown into the line through the conductors z and w,- the contacts 166 and 165-, and the conductor y to energize the call- 11p alarm 200 in the called substation The 5 period of such ringing of the call-up alarm 200 depends upon the length of the bar 59 and until its curved end 61 passes over the contact 166. Should the contact 165 be raised and sep= arated from the contact 166, the call-up machine M is cut from the line Should the called subscriber not respond Within reasonable time, the exchange operator will press upon the rod 38 and consequently the bar 59 will be moved inwardly and as the rod 38 is released, the spring 44, as before described, will move the frame 35- to initial position and thus again causethe actuation of the call np alarm 200 in: the walled. sub-station.

The call-up alarm circuit energized by the call-up machine M when the contacts l me-10h are closed is as follows:=='lhe conductor 2-, the machine M, the conductor 41 the contacts 16ft the conductor y, the conductor j, oftlie jackplug J, the socket 2, the line L", the'receiver hook 117, in the called substation, the contact 118, the conductor 115, the call-up alarm ill), the con- 3O ductor 115, the conductor 128', the coil 101, which is ineffective to the current from the machine M, the conductor 128, the remainder of the line L, the conductor 136,

the closed shunt contacts 13+ and 135 of the shunted substations, the line L, tact;

socket at the exchai'igi' st, tion, the jack plug .l, and the condiidtor I 1 As the. locking lever 7 inthe called substation raised so as not to bein the path 40 to engage. the notch receiver hooletl-lereo 'iheii the receiver has been removed therefrom, will automatically rise and thus open the contacts at 1l7118' and bridge the contacts 120 a'nd'121 and thus throw into the line the local battery'-circuitof the calledsubstation so that the called substation and the calling substation will be placed .in connection with the line wires L and L".

At the end of the conversation the ex change operator removes the jack plug J; and permits the contacts 2'--2 to close and as the contacts 68 are closed, due to the frame 9 of the selecting ll'eyengagingthem, the circuit including the eleetromagmt is closed and thus the armature 51 is moved in opposition to the spring 57 to remove the. arm 53 from engagement with the arm 49. This action will release the carriage and move the cylinder 17 under the action of -tl1e spring 3'. so that the cylinder is moved,

as for instance.from the position shown in Fig. -5 to that shown in Fig. .2. During this movement; the teelh (r are in engagelncnt with thcycontact (i5 and. will intermitto the 8i of the arm 80, the 4 tently open and close the contacts h and U5 and thus throw into the line the battery 111, which as before described will actuate all of the magnets 101 in every substation to automatically operate the shaft 17, the electroinagnets 95, and arnlatures l -l,.so that the disks 102 will be placed in normal posi tion zto indicate that the line is free and that the exchange station can be called by all substations. At this time all of the hooks 117 can be raised, as the locking lever 77 is inraised position and out of the path to engage the notch 85 of the various arms 80. i

In the event that a receiver in any set is left off of tl'iehook 117 such hook is consequently raised to permit contact l34135 to be opened, with contacts 'l(ii'-1il8 closed, and the-arm 80 d1" to the armature catch 83 will airmen "d with it the arm 81, Now, as the shafts 73 are rotated, as before described, during the selection of the called substation, the pin 103 carried by the disk 102 will engagethe contacts 105 in each sub station, thus elo. g a circuit :to energize the el etremagnet 88. Thus inthe substatinn where the hook 117 is raised, the armatnre catch 83 will be moved tothe position as shown in Fig. 5, and shouldthis he an uncalledsubstation, this s 'ibsta will. be shunted from lineln? the closure of the contacts "and the opening of the contacts im hid due to the falling thereupon of the, arm Hi. This circuit is as follo\vs':'lhe contacts 1 the conductor 151, the electromagnet 5H, conductor 150, bating the eieetminaguet 88 to at ture caieh 83. as above described, to release. the arm S1, W h 'diii to gravity will fall to close the contacts 1--H--135, thus shunting the substationirom the line. i

As before stated. the contacts li l'f llls are held opened by the arm -51 when down, and by this arr cement it is evident that the local batters ii is saved should the receiver be iiiirposely or accidentally left the hook.

The circuit traced through the calling "siibstat-i'on to the exchange station is as fol lows :Assu1-ningthe seleetingliey to be at zero position, and therefore the shunts at .l34135 at each substation open, and thus all substations connected to the line for callingfthe exchange station, and that a substation desires to :allthe exchange station. the magneto M is operated and the signal S at the. exchange station is energized asis the usual practice, and the exchange operator upon noticing these signals will insert the answering jack plug. The calling subscrib er now removes the receiver from the hook 117 so that the hook rises and bridges the contacts 120--l21.

The circuit with the exchange and the and thus lock the calling substation is as foll0vvs:-Th e answering jack socket 1, closed by'the answering jack plug J at the exchange station, the line L, the hook 117 of the calling substation, the conductor 122, the-coil 123, the conductor 175, the receiver cord R, the receiver R, the conductor R the portion of the line L to which the conductor R connects, the conductor 128, the coil 101, the conductor 128, and the line L to the exchange station. Thus the. receiver is connected to the line, so that the exchange operator can ask the substation the desired substation .to which the calling substation desires connection. Simultaneously, With the removal of the receiver R from the hook 117 in the calling substation, the transmitter T is connected to the line as follows the socket 1, the line L, the hook 117, the

contacts 120 121, the conductor 122, the coil 123, the conductor 124, the transmitter T, the conductor 125, the battery B; the conductor 126, the conductor 126', the closed contacts 167-16S, the conductor 126 back to the contact 120, the hook 117, the portion conductor 128, the coil 101, the conductor 128, and the line L to the, socket 1 at the exchange-station. The exchange station and the calling substation are now properly connected and the exchange operator, While the calling subscriber of the line L, the

holds the receiver off of the hook 117, and is placed into communication by theexchange operator, Who manipulates the selecting .key as before described, Will be placed into communication with the called. substation.

The manipulation of the selecting key operates the'lock-out devices in the uncalled substations, so that the receiver hooks are locked and the shunt connection at the uncalled substations are closed, thus shunting the complete uncalled substations from the line. V r The circuit for energizing, the various lockout devices in the different substations, even including the called substation are as follo\vs:The contacts 65-65, theconductor 110, the battery 111, the conductor 112, the line conductor L, the conductor.

tacts 129-130, the ccncluctor 132, the battery B, and the conductor 133.

The energization. ofthe electro magnet 95 in the uncalled substations causesthc dist: to cause the lock 85 to engage the arm 80 arm so that should the receiver be lifted from the hook in such uning the various lock-out devices change and the line L, this the electro magnets.

wvith the exchange.

By the'construction and arrangement ofthe selecting key,

the various lock-out devices in the different substations, are placed out of the control or interference of the various subsc1fi.bers, and are solelyoperable through the selecting key 'at the exchange, thus placabsolute control of the exchange so that when the calling and called substations are in-communication, the uncalled substation cannot in any way interfere with the operation of the system.

lVhat is claimed is 1. In a system of selective telephony, the combination of an exchange and a plurality of subscribers instruments connected in a talking circuit, aselecting instrument at the exchange, and a shunt operating device in each'subscribers instrument influenced only by the selecting instrument to shunt the uncalled subscribers" instruments from the talki'ng circuit and at the transmitter circuits to the batteries in the instruments so shunted.

same time openall the 2. In a system of selective telephony, the I combination of an exchange and a plurality of sets of subscribers instruments connected for the transmission of intelligence, said ex change having manually operated means for selecting a subscribers set and shunting the uncalled sets,. and automatically operated means for signaling the called set, said selecting means being the sole instrumentality for selecting and signaling a called set, and for shunting the uncalled sets.

3. In a system of combination of an exchange and a plurality of sets of subscribers instruments connected for the transmission of intelligence, said ex sired set, signaling the same. and shunting all uncalled sets from the system, said selecting means being the sole instrumei'itality for selecting and signaling a .called set, for shunting the uncalled sets,.and for connecting all sets tothe line for communication 4., In asystem of selective telephony, the combination of. an exchange and a plurality selective telephony, the

of sets of subscribers instruments. each set having a. transmitter. receiver, a callup device and a receiver locking and shunting device. said exchange and sets being connected fiathe electrical transmission of speech. and mechanism mounted at the exrliange' and manually operated to connect any two of the subscribers sets for communieationfta) operate the shunting devices in 130 under the v operator having means for selecting the de- 13,989 BEST 'AVAILABLE 001 sets to isolate them from the aulomatleally operating the ol the set called, and aufii'h the remalning hue, and for call-up devlcc iary means mounted in said mechanism for repeating the signal.

5:. ln :1 system ot' selective telephony: the

automatically operating the call-up alarm ot the set selected. 7

(3. 111 a system of selective telephony, the combination of :111 exchange and :1 plurality of subscribers sets ol instruments, includ -i'ng. each a shunting device, a visual indicator, :1 transmitter, :1 receiver and :1 call-11p device, sald exchange and s1lbscr1bers sets o't ll lstl'lllllt'llts belng :1: electrical communnn- 'ti'on and a selectin" device at the exchan e .tor selecting any one set for connection with a calling set, said device automatic: lly operating the call-up device in the selected set, giving :1 visual indication in all sets, and shunting all sets except the called and callin set.

1. ln :1 telephone system, the combination with :111 excln ngc station having :1 selecting apparatus, of :1 series of subscribers sets of instruments connected with the exchange station tor the transmission of intelligence,

each having a local battery circuit, :1 shunting device controlled 't'rom the exchange through the selecting apymrat-us, and a visual signal operable by said shunting device'tio indicate the condition of the local battery circuitrelatively to the transmitting circuit.

H. In a selective system of telephoi'iy, the combination of an cXchange'and a plurality ot" sets of subscribers instruments connected electrically tor the transmission of intelligence. a manually operated selecting device in the exchange and connected i11 the line, a

receiver hook lock in each subscribens set, means controlled h v the selecting device to cause said lock to be engaged or freed, and a shunting connection with the line' at ach snbscribers set controlled by said lock, whereby when two sets are connected for connnuni-cation all of the other receiver hooks are locked and the sets are shunted from the line.

9. In a selective system of telephony, the combination of anexchange and a plurality of sets of subscribers instruments connected electrically tor the transmission of intelligence, a manually operated selecting dev'ee, in the exchange and ((llllltt'tUtl in the line, :1 receiver hook lock in each subscribers set, means controlled by the selecting device to cause said lock to be engaged or freed, a shunting connection with the line at ach subscribcns set controlled by said. lock, ivherehv when two sets are connected for c(' "1':n1nn1'ication-all 1.1 the other receiver hooks are locked and the sets are shunted from the line, and a signal device controlled by each lock controlling means to indicate the line condition ol' its respective subscriber s set.

[0. ln :1 selective system ot' telephony, the combination ol an exchange, and :1 plurality ol' sets ot subscribers instrumentsconnected electrically tor the transmission ol intelligencc, a manually operated selecting device in the exchange and connected in the line, :1 receiver hook lock in each subscriber s set, means controlled by the selecting device to cause said lock to be engaged or t'reed, and a shunting connection with the line at each subscribefs set controlled by said lock, \vhcrebv \vhen tvvo sets are connected for communication all of the other sets are shunted from the line.

ll. In :1 selective system of telephony, the con'ibination ot an exchange, and a plurality of sets of subscribers instruments connected electrically tor the transmission of intelligence, a manually operated selecting device in the exchange and connected in the. line, a, receivcihook lock in each subseribers set, means controlled by the selecting device to ause said lock to be engaged or treed, a, shunting connection with the line at each snbscribers set controlled by said lock, whereby when two sets are connected for communication all (it the other sets are shunted t'rom the line, and. a signal device controlled by each lock controlling means-to indicate the line condition of its respective snbscribers set.

12. A selective system of telephony, having an exchange, and :1 plurality of subscribers sets of instruments connected elec trically tor the transmission of intelligence, :1 selecting device at the exchange, a lock out device in each subscribens set influenced by the selecting device, a shunt connection with the line at each subscribers set actuated by the lock out device, and a signal device in each subscribens set, the placing into communication of two subscribers sets, actuating all signal devices to indicate their condition relatively to the line while the shunt connections in all other sets than the calling and called sets are closed andfthe instrulnents shunted from the line.

.13. In :1 system of selective telephony, the combination of an exchangeand a plurality of subscribers instruments connected in a talkingcircuit, a selecting instrument atthe exchange, and a shunt operating and receiver hook locking device in each subscribers instrument influenced only by the selecting instrument to shunt the uncalled subscribers instruments from theitalking-cin' cuit. I

14:. In a system of selective telephony, the combination of an exchange and a plurality of sets of subscribers instruments (connected for the transmission of 1 intelligence and including a line shunt, a receiver hook lock and a device for controllingthe shunt and receiver hook lock, said exchange having manually operated means for selecting a i subscribers set and shunting the uncalled sets, said selecting means being the sole instrumentality for selecting acalled set, and for simultaneously operating the line shunts and receiver hook locks of the uncalled sets.

15. Ina system of selective telephony, the combination ofan exchange station and a plurality of substations connected for the electrical transmission of intelligence, each substation having a transmitter, a receiver, a call-up device and a receiver hook-locking andshunting device,

for connecting any two of the substations for communication and/ for operating the shunting devices in the remaining sfubsta tions to isolate them from, the line, and for and manually oper-- ,ated means mounted at the exchange station automatically operating the call-up device in the called substation.

16. In a system of selective telephony, the combination of an exchange station and a plurality of substations connected for the electrical transmission of intelligence, each substation having a transmitter, a receiver, a shunting device, a receiver hook lock, and a visual indicator, and manually operated mechanism mounted at the exchange station and being the sole instrument to connect any tWo of the substations for communication,-

and to operate the shunting devices and re- .ceiver hook locks in the remaining substations, and the visual indicators in all sub stations.

- 17. In a selective system of telephony, the

combination of an exchange station and a plurality of substations connected electri- .two substations may have their shunting ,connectlons opened Wlllle the remalning substations have their shunting connections closed and the receiver hooks locked.

In testimony whereof, I 'afiix my signature to the foregoing.

RUBEN o. M. HASTINGS.

Copies of this patent may be obtained for five centsieach, by addressing the Commissioner of Patents, Washington, D. G.

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