US779892A - Telephone selecting system. - Google Patents

Description

' PATENTED JANflO, 1905.

' W. D. WATKINS.

TELEPHONE SELECTING SYSTEM.

APPLIGATIOK FILED MAX 1, 190s.

lmm l azgm- EATENTED JAN. 10, 1905.

W. D. WATKINS.

TELEPHONE SELECTING SYSTEM.

APPLIGATION FILED MAY 1, 1903.

4 SHEETS-SHEET 2.

PATENTED JAN. 10, 1905.

W. D. WATKINS.

TELEPHONE SELEGTING SYSTEM.

APPLIGATION FILED MAY I 1903.

4 SHEETS-SHEET 3.

Milka, 1990.9101- 5' Edit PATENTED JAN. 10, 1905.

W. D. WATKINS. TELEPHONE SELECTING SYSTEM.

APPLICATION FILED MAY 1, 1903.

4 SHEETS-SHEET 4.

UNITED STATES Patented January 10, 1905.

PATENT OFFICE.

TELEPHONE SELECTING SY STEM.

SPECIFICATIONforming part of Letters Patent No. 7 79,892, dated January 10, 1905.

for use on party-lines; whereby all of the subscribers telephones will be placed Wholly under the control of an operator at the central station, it being impossible for any one sub- .scriber to call another subscriber except through the intervention of central. I A further object of the invention is to provide a system by means of whichit will be impossible for any subscriber to break in on the line while the latter is inuse or to call the central station before the operator at the latter point has answered a previous call.

A still further object of the invention is to provide at each subscribers station an automatic switching mechanism by means of whichthe number of the subscribers telephone is signaled to central automatically onthe removal of the receiver from the receiverhook." I A still further object of the invention is to provide means operable, on'the return of the receiver to thehook for immediately cutting out'a telephone and'rendering it impossible for the subscriber to usethe talking-circuit until he is again connected by the operator at central.

A still further object of the invention is to so arrange and construct the mechanism forming part of the system as topermit its ready j application to existing telephone systems.

WVith these and other objects in view the lnvention consists in the novel construction and arrangement of parts hereinafter described, illustrated in the accompanying drawings, and particularly pointed out in the appended claims, it being understood that various changes in the form, proportions, size, and minor details of the structure may be'made without departing from the spirit or Application filed Meyl, 1903. Serial No. 155,193.

sacrificing any of the advantages of the invention.

In the accompanying drawings, Figure l is a diagram of a telephone selecting system arranged in accordance with the invention. Fig. 2 is an elevation of a telephone switchbox, the door being partly open, illustrating the receiver-hook-controlled mechanism for signaling central and the arrangement of the switches controlled by the electromagnets of the call-bell for closing the talking-circuit. Fig. 3 is a plan view of the gravity-track "connected to the receiver-hook and forming a part of the circuit-closing device arranged at each local station for slgnahng central. Fig. 4 is a transverse sectlonal elevation of the same on the lined A of Fig. 2. Fig. 5 is a similar View on the line 5 5 of Fig. 2. Fig.

6 is an elevation of the selecting mechanism and its containing-casing. Fig. 7 is a detail perspective view of a circuit-closing means forming a part of the selecting mechanism. Fig. 8 is a transverse sectional elevation through the lid 01: cover of the telephone switch-box, illustrating the arrangement of the electromagnets' of the call-bell and the circuit-closing -means controlled thereby. Fig. 9is a detail perspective view of the auxiliary armature and the circuit-closing means under its control. I

' Similar characters of reference are employed to indicate corresponding parts throughout the several figures of thedrawings.

- In the drawings, A indicates a central sta' tion, and B and C local or subscribers sta---- tions, the several stations'being connectedby line-wires land 2.

At the central station is an indicating de vice 3, connected between the ,two'line-wiies and energized by a batterye each time the circuit on the main line is closed; The main line may be grounded, as indicated at 6. The construction of each subscribers station is the same, and the connections fromthe linewires 1 and2 are through local Wires 114: and 7 3, respectively. Y

.In each subscribers station is placed a se lecting device including an electromagnet,

which will be energized each time the operator at central closes the circuit by-the key or lecting device may be of any suitable character capable of closing the calling-circuit after movement to a predetermined .position,the position or extent of movement being different at each subscribers station and being under the control of the central station exclusively.

It is preferred to employ a selecting mechsomewhat similar toanism of a construction that illustrated in an application for Letters Patent filed by me on August 29, 1902, under Serial No. 121,531, and to which reference is made for exactdetails of construction, and whenthe apparatus is to be applied to telephone systems already in use it is preferred to place this selecting mechanism in a separate box or casing distinct from the telephone and preferably disposed at a suficient distance therefrom to prevent annoyance t9 the subscriber from the clicking sound made at all the stations when central is calling any one of them.

In the selecting mechanism, 11 indicates a frame provided near its upper end with arms for the support of one or more electromagnets 12, the frame being preferably formed of diamagnetic metal. The central bar of the frame is provided with rearwardly-bent arms 13, having openings for the reception of pivot pins or screws of a soft-iron armature 1 1 for actuating the disk of the selecting mechanism. The central portion of the main bar is cutout to form a tongue 15, which is bent forwardly at a right angle to the plane of the frame and forms asupport for some of the locking members. Near the lower end of the frame are two forwardly-bent arms 16, having suitable openings for the recp tion of the pivot pins of the locking and guard disks, and the extreme lower end of the main bar is bentforwardly to form a horizontally-disposed bar 17. The soft-iron armature 14: is attracted each time. the magnets are energized and is returned to initial, position by a spring 21 when theinagne ts are deenergized. I i To the main frame is pivoted a bar 22, having at its free end'a tongue 23, passing under the arm 15 of the frame and provided with a,

depending arm or red 24, having a laterallye bent lower end 25, which'isvdisposed immediately above a spring-contact'26, secured at one end to the frame or casing and electrically connected to a current-conducting wire- 27. The contact 26 is arranged immediately above a contactplate 28 ,carried by the casing, and electrically connected to a current-conducting wire 29. The arm 22 is e'hgaged and held in elevated position by a catch 30, formed of a strip of metal having an integral counterbalance portion 31 normally holding the catch in engaging position. This catch is pivoted on a pin. 32 at one SlClG of the arm 13, and its" engagementwith the arm 22 isautomatie, the

to a position immediately under said bar.

arm 22 being elevated to engaging position by the inward movement of the lower end of the armature 14: each time the electromagnets are deenergized, said armature having a projecting finger 33 for-engagement with the under side of the arm. The arm 22 need only be elevated after an operation of the selecting mechanism of which it forms a part, and while the finger 33 comes into contact therewith at each movement of the soft-iron, armature a movement of the arm is only effected after said arm has been dropped to cause the engagement of'the contacts 26 and 28. T 0 permit the return movement, the under side of the catch is curved or inclined, so that contact withthe locking-arm serves to force the catch outwardly until the arm reaches the locking position, after which the .counterweight of the catch moves the latter to locking position.

The locking-catch is released by means of a bell-crank lever 35; pivoted near the'out'er end of the arm 13 and having a horizontal arm extending under the counter-weighted end of the catch and a vertical arm adapted to be engaged and moved to release the catch by a projecting pin on the guarcl-disk.-

The lower arms 16 of theframe have threaded openings for the passage of pivot-screws which engage the opposite ends of spindles 38 and 39',

carrying, respectively, the locking-disk 40 and -to the spindle and at the opposite end to a.

stationary pin 43, projecting from the frame, these springs serving to turn the disks to an initial position after each operation of the se lecting mechanism and, further, to act in connection with the armature to effect a rapid oscillatory movement of said guard-disk. TThe locking-disk 40 is provided at one point in its periphery with a notch {L5, which. is adapted to receive the lower portion of the locking-arm 22 when the notch has been mplvled 11s disk is further provided with a number of peripherally-disposed ratchet-teeth 4:6, and within the-line of the teeth is a row of openings 47 being adapted for the reposed arm 4t9, which is freetoturn on thespindle 38 to any desired position, and then locked by the engagement of its pin in one of the openings 47 The'extreme' end-of the arm 49 is projected beyond'the periphery of the lockingdisk and forms an extension of the disk-tooth circuit to effect a movement of the lockingdisk until the locking-arm 22 and the notch 4C5 are in alinement. The construction permits of the manufacture of thedevicebymp a l phone .on the-anathema of a number equal-to the number of ratchet- -teeth,.said'openings ceptionofa pin &8, carried by a radially-disprovided with asimilar mechanism and the arm .48 being adjusted at an angle from the notch depending upon the number of the telephone. The locking-disk receives a stepby-step rotative movement and is locked in position at each movementby a pivoted pawl 51, carried by'one of the arms 16 and held by a spring 52. The disk 41 has a toothed periphery and is provided with two laterally-projecting pins 53 and 54, disposed at different distances from the center of rotation of said guard-disk. This disk receives a comparatively rapidosCillatory movement, and at the beginning of the movement the pin 54 moves from contact with the tail of the pawl 51, which is normally held away from the locking-disk when the device is not in operation, and at the same time the pin 53 moves beyond the lower inclined'end of the depending arm of the bell-crank' lever 35 and is retained outside the arm until the locking-disk has been moved to releasing po- 'sition, at which time the guard-disk will be returned to its normal position by the spring 42, and the bell-crank lever will be moved in such manner as to raise the catch 30 and remove the same from engagement with the locking-arm 22, and after this the pin 54 will move to release the disk-locking pawl 51.

Secured to the lower end of the armature 14 is a pawl-bar 60, preferably formed of .a sheet of stamped metal, having one end pivoted tothe armature and maintained in proper position by a spring'61, carried by the armature and extending inside the bent portion of the pawl-bar. As a convenient means for bolding the spring in position the armature stopscrew 62 is provided with an auxiliary nut 63, which confines the spring in place and at the same time acts as a jam-nut for holding the stop-screw in adjusted position. The pawl- I bar carries two pawls 64 and 65, adapted, re-

spectively, to engage the-teeth of the locking and guard disks, and is further provided'with a downwardly-bent inclined lug 67, which is adapted to engage with the upper end of a" screw 68 when the soft-iron armature is attracted and the bar is moved outwardly.-- The screw 68 is carried by a threaded opening in the lower horizontal arm 17 of, the frame.

In the operation of the device the central station energizes the circuit, and the disks of all the subscribersstations move simultaneously until the notch 45 of the locking-disk at the station of the selected subscriber arrives under the'locking arm 22. On the last impulse sent by the operator at central the circuit-is held closed for a considerable period of time and the guard-disk 41 is allowed to return to its initial position, the pin 53 engaging the bellcrank lever 35and moving the horizontal arm of thelatter upward under the counterweight of the catch 30 and moving said catch to releasing position.- The locking arm 22 then falls toits lowest position and as the depending arm 24, carried by said arm, forces the con- When the circuit is broken by the operpulse, the armature 14 is releasedand is moved by its spring until the arm 33', carried by the armature, engages under the locking-arm 22 and forces the latter into engagement with the catch 30. This raises the depending arm 24 and breaks the circuit. between the wires 27 and 29. The locking-disk then returns to its initial position under the influence of its spring and the parts are again in readiness for another operation.

- On reference to Fig. 1 it will be seen that the box or casing which contains the selecting mechanism isseparate and distinct from the phone and for convenience is provided with three binding- posts 70, 71, and 72, the binding-post 70 being connected to the wire 27 and the binding-post 71 being connected to the wire 29, and from said binding-post 71 extends a wire 29 to ground. The bindingpost 72 is connected by a wire 73 to the main line-wire2, and from thence the wire is continued through the electromagnet 12 and at the opposite end of the coil of the magnet is,

binding-post 72, electromagnets 12, to wire 29, to binding-post 71, to wire 29 and ground, these impulses continuing during the operation of the selecting mechanism and all of the remaining portion of the local system being cut out, owing to the break between the contacts 26 and 28.

80 designates the electromagnets of an ordinary form of call-bell, includinga polarized armature and clapper-rod, and said electromagnets are connected in a circuit leading from the wire 73 through a wire 81 to binding-post 82, hinge 83, wire 84, electromagnets 80 wire 85, hinge 86, wire 87, bindingpost 88, and wire 89 to binding-post 70, and from the binding-post 70 the circuit continues through Wire 27 to spring-contact 26, so that when the selecting mechanism is properly operated and the depending rod 24 is dropped a circuit will be established, as before mentioned, and through the contacts 26 and 28 to wire 29, binding-post 71, and wire 29 to ground. The current entering the wire 73 from the'main line-wire 2 will be divided, a portion flowing through the electromagnet 12 of the selecting mechanism and maintaining the armature thereof in attracted position and erated each time the circuit is closed at the stances be accomplished except by the operaspring circuit- closers 94, 95, and 96, connect- Wanna call-bell, the call-bell continuing to sound so long as the circuit is maintained closed by the operator at central. By the mechanism thus far described the central station maysounol a call-bell of any desired subscriber without sounding the-bell of-any other subscriber, and. while all of the selecting mechanisms are op central station this selecting mechanism may be placed at any desired distance from the phone in order that the clicking noise made may not annoy the subscriber, who will only be notified of the fact that the line is in op eration when his call-bell is sounded.

To the casing or other support, at a point adjacent to the electromagnets 80, is secured a small bracket or clip 90, forming a pivotal support for a rod 91, formed of iron or similar magnetizable material and provided with an end portion bent at right angles and disposed Within the field of force of the electromagnet 80, preferably ata point slightly above the poles of the magnet, but so arranged as not tointerfere with the free movement of the polarized armature which operates the bell. The rod 91 is provided with a dependingportion which is bentoutwardly and down- Wardly, as indicated at 93, to form a circuitclosing means arranged adjacent to the three ed, respectively, to current- cond ucting wires 97, 98, and 99, The circuit- closers 94 and 95 are normally in contact with each other, while the springwontact 96 is normally disengaged from both." The spring 96 has an offset portion 96 arranged within the path of movement of the portion 93 of the arm, so that when the portion 92 of said arm is attracted on the 'closing of the circuit the depending portion of the arm will be moved into engage ment with the otfset 96 and'force the springcontact 96 into engagement with the contact 9a and move contact 94 away from contact with the spring 95. I The result of this op eration is to place the subscribers transmitter and receiver in circuit with the main line-an operation which cannot under any circumtor at central, and then only by first operating the selecting mechanism until the desired number is reached, the selecting mechanism closing the circuit through the magnets 89, causing the sounding of the call-bell and the movement of the rod 91 in the mannerdescribed, so that when the subscriber removes his receiver from the hook he is connected to the line and can communicate with central or with any other subscriber which central has connected to the line.

The receiver-hook 101 is pivoted on a stud 102 in the usual manner and extends out through a suitable opening in theside of the and secured in any suitable switch-box forthe reception of the receiver.

lnythereceivenhook bar is formed an opening-l93'forithe reception of the horizontal arm 104 of a verticaiiy-disposed bar 105, guided in brackets projecting inwardly from the lid of the switch-box. The bar 105 is provided at its upper end with a spring 106, having an inclined forward edge and at its upper end being bent laterally to form an inclined surface for engagement with a corresponding inclined surface at the end of an arm 93', projecting from the lower end of the depending,

portion 93 of the rod 91. The positions of these parts are such that when the subscriber removes the receiver the receiver-hook will be forced up'by the spring 107 in the 1isualmanner, and the inclined upper end of the spring 106 will be forced over the inclined end of the arm 93 until it reaches a point above said 'arm and is then slightly out of contact. If the conversation is finished and the subscriber replaces the receiver on the hook, the descending movement of the latter will cause the forwardlyinclined edge of the spring 196 to engage the arm 93 and force the latter outward, causing the armature portion 92 of said arm to be raised to initial position or a point slightly above the line of the poles of the electromagnets 80, the arm being maintained in this position by engagement with the springcontact 96, or an auxiliary spring or friction device of any desired character may be employ'ed for the purpose. The replacing of the 9 5 receiver on the hook permits the contact 96 to'move from engagement with the. contact 9st, and the latter then moves into engagement with the contact 95, the subscribers talkingcircuit being cut out and the parts restored to initial position in readiness for a subsequent operation.

Before describing the arrangement of the circuits closed by the movement of the arm 91- I will first describe the construction and arrangement of the mechanism whereby. the subscriber is enabled to automatically signal his number to central by removing the receiver from its supporting-hook.

In the telephone switch-box is placed a plate 110, formed of wood, vulcanized fiber, or other suitable non-conducting material and provided with a number of contact buttons or plates 111, the number beingdifferent in each phone and corresponding to the number designating the subscriber. in the present instance five'of such contacts are shown, and each is independently connected to a wire 112, leading to a binding-post 113, which is connected by a wire 114- to the main-line wire 1. The several contacts 111 are arranged in the arc of a circle, at the center of which is mounted the horizontal portion 115 of switchiarm 116, saidhorizontalportion 115 passing through suitable guiding-openings in abracket 117, which may be formed of stamped. metal manner to the base'plate 110. The upper member of the switch-arm 116 is provided with a contactplate 117, which engages all of the contacts scriber.

at one end in such manner as to form a foot- 5 receiver-hook, and each of the members of the passes through a guiding slot or opening formed by-bending 49fswitch-lever 116. The point .of attachment between the receiver-hook and the trackway the nivot102-of th I lcause vthe contact 117 to travel overall of the contact 117' remainingin constant engagement therewith d i'eceiverhook is up, ,tromagnet of the indicating device at central scribers calling central.

it cannot be deenergized by 5 scriber.'

The wiring of the local-telephone may be that followed in ordinary practice, and the diagram illustrates a common method of connecting the receiver and transmitter, a local battery being introduced, in the primary circuit, as usual.

-When a subscriber wishes to call central, he removes his receiver from the hook, and as the 111 as it is moved in an arcuate line across the board, and the supporting-bracket, switcharm, and contact 117 I are all formed of conducting metal, the bracket being connected by a line-wire 118 to a hinge 119 and the circuit extending through a wire 98 to the intermediate spring-contact 95. When the contact 95 engages the contact 94, the circuit is completed through the wire 97, hinge 83, binding-post 82, wire 81, and wire 73-to mainline wire 2, and as this circuit includes the battery and indicating device at the central station the movement of the switch-arm across the, series of contacts 111 will alternately close and open the circuit a number of times corresponding to the number of contacts 111, and the responsive indicating device at central will show the number of the calling subthe-several contacts 111, closing the circuit through the battery and indicator at central a number of times equal tothe number of contacts; In answering the central operator closes the circuit by means of a key or other suitable device a number of times equal to the number of the subscribers phone and the electromagnet 12 of the selecting mechanism is energized by the passage of a current from central battery, circuit-breaker, main-line wire 2, wire 73, binding-post 72, electromagnet 12, wire 29, binding-post 71, wire 29', to ground and from ground at central to battery. Afterithe responsive-movement of the selecting mechanism the depending bar 24 of the latter moves the contact 26 into engagement with the contact 28, and central now holding the circuit closed for a considerable period of time, divided at the binding-post 72, a portion passing as before through the selecting-magnet box. Between the spaced members of the 12 of the described circuit to ground, while trackway fits a roller 122, formed of any another portion of the current passes through material and provided with extended hubs the wire 81, binding-post 82, hinge,83, wire 1.23, which rest on the trackways under the 84, electromagnet 80, wire 85, hinge 86, wire guard-wires 121,'the latter preventing any 87, binding-post 88, wire 89, binding-post70, upward movement of the roller. In one end wire 27, contacts 26 and'28, wire 29, bindingof the hub is inserted a headed pin 124, which post 71, wire 29, to ground and from ground at central to central battery, thus energizing the subscribers call-bell. I When the subscribers call-bell is energized,

To operate the switch-arm automatically, there is attached to-the receiver-hook 101 a trackway 120, formed of a pair of spaced bars of any suitable material, the bars being bent piece for the passage of a securing pin or screw by which the track is secured to the track is provided with a guard 121. The track is centrally pivoted on a standard 120', arrangedin the lower portion of the switchthe lower end of the is at that end farthest from the pivot-point of the receiver-hook, and when the receiver is removed and the hook-raised the trackway will be tilted in such mannertas to cause the heavy roller 122 to travel in the direction of e receiver-hook, and thus down and the depending portion 93 of said arm engages the ofiset portion 96 of the spring-contact 96, forcing the latter into engage'meht with the contact 94 and moving the contact 94 from engagementwith the contact 95. I now have a circuit'extending from central through wire ,2, wire 73, bindingpost 72, wire 81, binding-post 82, hinge 83, wire 97, contact 94, contact 96, wire 99, to a hinge 130 and thence to receiver-hook switch 101, wire 132,,to the secondary ofthe local circuit, the receiver and wire 133, to bindingpost 113, wire 114, to the main-line wire 1, and return to central, or in case central has connected another subscriber in the line the two connected subscribers may com municate with each other. I The remaining portion of the local system i may be traced from local battery to trans mitter, the primary coil of the inductorium, wire 132, to receiver-hook switch 101. and re turn to battery.

It will be seen that under no circumstances. can a subscriber connect his talkingbircurt to the contacts 111', the final of thecontacts 111" being somewhat broader than, the rest and uring all the time the so as to keep the elecstation energized and preventing another sub- It will be readily understood in' this connection that as the electromagnet of the central indicating, de vice mustbe deenergized before it can again come respensive to a call so long as a calling subscriber allows the hook to remain up and keeps the circuit closed the magnet of said indicatingdcvice will be energized, and

any other sublatter moves up the contact 117 will ride over the enteringcurrent is normally disconnected from the main line,

means controlled bythe energizing of the cal l-bell magnets for placingthe talking-circuit in communication with the main line, and a selecting means 'normallylconnected in the mainline and provided with means for closing the circuit through the electromagnets of the call-bell.

2. In telephony, a system comprising a central station, and main lines, a plurality of local stations each including a transmitter, a

receiver, and a call-hell, the transmitter and receiver being normally cut out of the main line, means under the control of the magnets of the call-hell for placing the talking-circuit in communication with the main line, and a selecting means in constant communication with the main line and controlling the energizing of the call-bell magnets.

- 3. 1n telephony, a central station, 'a main line, a selecting means disposed at each local station and normally in circuit with the main line,a norm ally cut-out local talking-circuit at each station, a normally cut-out signaling means at each. station, said devices being arranged to constitute a serial circuit-closing means in which the selecting mechanism controls the circuit of the signaling means and the signaling means controls the talking-circuit.

In telephony, the combination .With a mainline and a plurality of stations, of a serial circuit-closing means comprising a selecting mechanism, an" electromagnetic call-bell, receiving and transmitting instruments included in a normally cut-out talking-circuit, means controlled by these'lectin mechanism for closing the circuit throughthe magnetsof the call-bell, and means operable by the energizinglof thecall-bell magnets for placing the talking 7 oircuit'in' communication with the main line. v 1

5. In combination, a main line, and a plu rality of locals'tations connectedthereto, each of the local stations comprising a selecting mechanism in constantcommunication with the main hue and provided with a c1rcu1t-clos-'- ing means, an electromagnetic call-bell-nor-.

' mal'lyd'isconnected:fromthe main line and connected thereto by the circuit closingmeans,

of the selecting mechanism, the magnets of the bell controllinga second circuit-closing means, and a normally disconnected talking circuit under the control of said second circuit-closing means, whereby the selecting placed in communication with the main line.

6, lln telephony, a central station and a main line, a plurality of local stations connected to the main line, a selecting mechanism arranged at each local station and normally connected tromagnetic call-bell disposed at each localstation and normally cut out of the main line,

the selecting mechanism for placing the magnets and the call-bell in communication with said main line,a normally cut-out local talking circuit, anol'means under the control of the electromagnet of the bell for placing the talking-circuit in communication with the main line.

7. In telephony, a central station, a main;

' line and a plurality of local stations connected to the main line, an electromagnetic call-bell ateach of the local stations, a normally cutout local talking-circuit. means under the con-' trol of the bell-electromagnets for placing said talking-circuit in communication with the ceiver-hook fol-restoring said circuit-closing means to lnitial position.

line'and a plurality of local stations connected to themain line, an electromagnetic call-bell at each station, a selecting mechanism for controlling the operation of said call-bell, a normally cut-out local talking-circuit, a circuitclosing means under the control of the bellelectromagnets for placing the local talking- ,circuits in communication with the main line, and means controlled by the receiver-hook for restoring said circuit-closing means to initial position.

line and a plurality of local stations on the main line, an electromagnetic call-bell at each local station, aselecting means for controlling the operation of the call-bell, a normally cutout' local talking; circuit, a circuit-closing means for placing" said talking-circuit in communication withthe main line, and apivotallymounted bar -.adapted to engage said circuitclosing means, said bar having-an armature arranged Within the field of force of the bellnection of the local talking-circuit with the main line. 7

- line and a, plurality of 'local' stations connectedv to the mainline, anelectromagnetic call-bell at each localstation, a. selecting meanscon v mechanism and the call-bell magnets must first he energized before the talking-circuit can be through ground to the central station, an elecmain line, and means controlled by the re-.

8. In telephony, a central station, a main electromagnets thereby to permit the simultaneous sounding of the call-bell and the'con- I 10. In telephony, a central station, a main) trolling-the operation of saidcallsbell, anona circuit-closing means under the control of i I10 9. In telephony, a central station, a'main I mally cut-out local. talkingcircuit, a circuit 3 ture arranged'within the field of force of the memberiand adapted to engageall of the contaets on the tact, a pivotally-mounted arm carrying said the bar to initial position signaling mechanism'comprising an oscillasignaling device comprising a pivoted track connected to th contacts connec ed to the signal gravity from end to end thereof,- and a movthereof, a plurality of spaced the receiver from the lower portion of said arm being bent to form an elongated slot or recess, a pin projecting from the roller and engaging said slotted portion or recess, a spring-contact carried by the-upper portion of the arm, and a plurality of spaced contacts connected in the signaling-circuit and with which said springcontact engages on the removal of the receiver from the hook.

16. In telephony, a rcceiver-hook-actuated signaling device comprising a plurality of spaced contacts connected to the signalingcircuit, there being in each of the local stations contacts of different number to permit the automatic signaling of thennmber of the station to central, the last of said contacts at, each station having I than the remainder, and a movable contact actuated by the up'wardmovement of the receiver-hook and adapted to engage successively all of said contacts.

17. In telephony, the combination with an l'ectromagnetically operated call-bell, a pivotallymonnted arm, having an armature disposed Within the field of force of the electromagnets, a plurality of spring-contacts adapted to be engaged by the arm and connected partly in the signaling and'partly in the talking circuits,'the lower end of said arm terminating in an inclined shoulder, a vertically movable bar connected to the receiver-hook,

closing device for placing the talking-circuit in communication withxthemain line, apivotally-mounted bar adapted to engage the .cir cuit-closing means, said bar having an armaelectromagnets, and means controlled by the movement of the receiver-hook for restoring and thus cutting out the local talking-circuit.

11. In telephony, a receiver-ho0k-actuated tory track, a member, carried thereby and movable by gravity from end to end of the trac a plurality ofstationary contacts connected to the'signaling --circuit, and a movablecontact operatively connected tosaid movable removal of the receiver from the hook. v 12. In fte'lephony,fa receiver-hook-actuated a plurality of ing-circuit, a movable by receiver-hook,

roller mounted on' the track and able contact operatively 'connected to the roller and adapted to'engage the severalcon tacts when the receiver is removed from the ook. p I 13. In telephony, a receiver-h'ook-actuated signaling device comprising a pivotallymounted track connected to andmovable with the "receiver-hook, a roller mounted on the track and movable by gravity from end to end contacts consignaling-circuit, a movable conof the bar and having a .ingthelower portion of the arm ing the same to initial position.

18. In telephony, the combination with an electromagnetically-operated call-bell, of a' pivotally-mounted arm having an armature arranged within the field of force of the elec': trornagnet, a plurality of springcontacts adapted to be engaged by'the arm and connected partly in the signaling and partly in the talking circuit, the lower end of said arm having a l1ori'/ ontally-disposed portion terminating in an inclined shoulder, a vertically-movable bar operatively connected to the receiver;hook, and a spring-tongue se- '-cu.red to the upper end of said bar,the upper portion of the tongue being inclined to engage the inclined shoulder of the arm and the forward face of said tongue forming a cam for engaging with and restoring the arm to its initial position.

and returnnected to the movable contact and adapted to traverse the latter over the spaced contacts, and means connecting said pivotally-mounted. arm to the roller. l v

14. In telephony, a receiver-hook-actuated signaling device comprisinga pivoted track, a roller mounted on the track and movable by gravity from end to end thereof, an angularlybent arm having a horizontally-disposedportion, a bearing or support with which the horizontally-disposed portion of said armen gages, a spring-contact carried by said arm, and a plurality of spaced contacts connected to the signaling-circuit and with "whichsaid movablevcontact engages on-the'removal' of the hook. f

15. In telephony, a receiver-hook-actuated mechanism comprising a pivoted trackway formed of a pair of spaced parallel bars, a roller having extended hub portions mounted onsaid bars, a bracket having bearing-openings, an angularly-bent arm having .a horizontal portion passing through said openings,

my own I have hereto aflixed my signature in the presence of two Witnesses.

WILLIAM DAVID WATKINS. Witnesses: A. M. BAXIER, LA VONE C. WVILLIAMs.

and a spring-tongue carried at the upper end cam-face t'or engag- In testimony that I claim the foregoing as I a greater surface area

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