US824431A - Telephone-switchboard. - Google Patents

Telephone-switchboard. Download PDF

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Publication number
US824431A
US824431A US7336501A US1901073365A US824431A US 824431 A US824431 A US 824431A US 7336501 A US7336501 A US 7336501A US 1901073365 A US1901073365 A US 1901073365A US 824431 A US824431 A US 824431A
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United States
Prior art keywords
drop
arm
telephone
switchboard
frame
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US7336501A
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William E Mccormick
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INTERNATIONAL TELEPHONE MANUFACTURING Co
INTERNAT TELEPHONE Manufacturing Co
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INTERNAT TELEPHONE Manufacturing Co
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q1/00Details of selecting apparatus or arrangements
    • H04Q1/02Constructional details
    • H04Q1/14Distribution frames

Definitions

  • My invention relates to telephone-switchboards, and more particularly to that class of switchboards wherein all of the mechanical and electrical devices pertaining to each subscribers line atthe central station areincluded in a unitary structure capable of being placed in and removed from the switchboard as a single device.
  • the principal obj ect-of my invention isto provide a line-jack and annunciator of the combined or unitary type wherein all the mechanism, including all of the electrical devices associating with or cooperating with the jack, drop, and plug pertaining .to each subscribers line at the central station, is embodied in a single structure capable of'bodily assemblage in and disassemblage from the switchboard frame or cabinet.
  • Another object ofmy invention is to provide an improved device of'this unitary char-' acter wherein the magnet and drop, together with the operating parts-ofthe drop, may be readily disassembled from the frame of the unitary structure for repairs or replacement and easily and quickly replacedthere'in.
  • Another object of my invention is to provide an annunciator of the drop-shuttertype having simple and efficient means to mechanically and automatically restore the drop .by means ofthe plug.
  • a further object of my invention isto provide a novel and simple construction and arrangement of all of the parts comprising a combined or unitary drop and jack structure, whereby all the electrical devices of each unitary device may be automatically included in their proper circuits by the placing of the device in position on the board.
  • a further object is to provide novel and efficient means for closing the night-bell circuit when the drop falls to'signaling position.
  • Figure -1 is a side elevation of a combined or unitaryjjack and drop structure exemplifying my invention.
  • 'Fig. ,2 is a frontelevation thereof with the drop or annunciator in its normal or non-signaling position.
  • Fig. 3 is a sideelevationof the parts shown in Fig. 1, 'but taken on.the sideopposite to'that shown in Fig. 1.
  • Fig. 4 isa-rear elevation illustrating various mechanicaland electricaldevices employed.
  • '5 isa top plan view.
  • Fig. '6 is .a bottom plan View.
  • Fig. 8 is a detail view of the core and actuating-coil of1the s0- lenoid or electromagnet employed.
  • Fig. 9. is a detail view of the drop-caseand,slidingarmature employed, the parts illustrated in Figs. 8 and 9 being shown as disassembled upon theircommon axial line.
  • Fig. lO' isa front elevation of the structure, showing the drop in signaling position.
  • Fig. 1-1 'isa vertical central sectional view of the structure ion an enlarged scale.
  • FIG. 12 is adetail view :ofpart of the frame of'the combined jackand :drop structure, together with [the solenoid employed, and illustrates the method of.assembling and disassembling *these parts.
  • Fig. 13' is-a diagrammatic view of the circuits and circuit connections ofmy combinedjack and drop structure at the switchboard.
  • the reference-letter A represents'a :portion of a switchboard cabinet or supportfsudhas a rear-rail thereof, provided with'holesfor the passage of screw threaded rods a and .a", which are electrically connected with their respective line-jacks in .a manner ihereinafter explained and by means of which .theframes ofthe j ackanddrop structures and the associated parts are secured to the cabinet or back of'the switchboard by suitable thumbvnuts a which'bindthe parts together, andto which the subscribers line-wires are conneeted, as by means of suitable clips (0 providing soldering-terminals, all as shown in Figs. 1 and 7.
  • the part A is also provided with suitable strips a and a, forming the board-terminals of a normally open night alarm circuit, including a battery and a signal device, as shown in Fig. 13, and which are adapted to be engaged by suitable corresponding frame-terminals, as hereinafter described.
  • each combined jack and drop structure comprises a face-plate B and a rear block C, which are rigidly connected together in alinement by a metallic conducting-plate c.
  • the plate 0 is secured by screws or other suitable means to one side of the block C, where it is in electrical connection with the screw-rod a and is provided at its forward end with an angular extension 0, which is suitably tapped for screw-threaded electrical connection with a plug-socket 7) of the jack, which passes through the face-plate and is preferably flared at its outer end to provide an annular shoulder to securely bind the parts together, as well as to make an enlarged mouth for the plug.
  • the plate B is provided. with a suitable bore or passage b having a shoulder b", and the block 0 is provided with a rearwardlyextending socket or channel 0, which is arranged in the same axial line as the passage b and has upwardly-directed openings 0 and c in its topwall, leading out upon the upper face of the block.
  • a suitable conductingplate 0 is attached to the rear face of the block and is provided with a forwardly-extending spring-arm c, which has a downwardly-bent and preferably rounded portion or terminal a lying in the opening (2 and projecting into the socket 0
  • a second conducting-plate is attached to the side of the block under and in electrical connection with the plate 0 and has an inwardly-directed spring-arm which carries a lug c projecting through the opening 0 into the socket 0
  • a conductingplate 0* in electrical connection with the screw a, is attached to the side of the block opposite the plate 0 and is extended around the lower portion of the block to support an intermediate strip 0 of insulating material, which closes suitable slots or kerfs in the bottom edge of the block in which suitable conducting-strips :0 and y are held.
  • These strips extend forwardly different distances in the line of the plug-socket b and are normally in electrical connection near their front ends, as shown in Fig. 6.
  • the strip :0 constitutes the spring of the jack and has a suitable bent end to engage the neck of the tip of the plug, whereby when the plug is inserted in the jack the electrical connection between the strips is broken and the plug is held. in place within the jack.
  • the strip 90 is in electrical connection by a suitable conductor 90 with the screw-rod a
  • the strip y is in electrical connection by a suitable conductor y with the plate 0
  • the reference-letter D represents a solenoid adapted to be removably mounted in the frame and having a hollow core (1, in which plays a sliding armature cl, which may be solid or hollow and is of such length that when the solenoid is energized it is drawn into the core in order to release the drop or annunciator, as hereinafter described.
  • the helix is wound upon the core, which carries the usual heads and (Z and the core projects beyond the rear head in a sleeve (1 and has its rear end closed by a suitable block or plug (1 of insulating material, carrying a conducting-tip d", having a reduced neck or diameter (F.
  • the terminals of the helix are electrically connected with the sleeve d and the tip d by the conductors 1 and 2, respectively, the conductor 2 passing through an insulating spool in the sleeve to the interior thereof, as clearly shown in Fig. 11.
  • the solenoid fits within the frame and is readily removed from and replaced therein, the spool d entering the opening Z) and engaging the shoulder b" to limit the position of the parts, and the sleeve and tip entering the socket 0 where the contacts 0 and c engage 5 the tip and sleeve terminals, respectively, of the helix, the spring-contact 0 serving to hold the solenoid against accidental displacement.
  • the solenoid When in position in the frame the solenoid is automatically connected in the subscribers line-circuit, which is traced through the screw a, connection as, strip at, strip y, connection 1 plate 0 tip (1, connection 2, through the helix and connection 1. to sleeve d, lug a, plate 0 plate 0 to screw a, whereby the helix is energized when a subscriber sends an incoming signal.
  • the energization of the helix of the magnet is employed to operate the line-signal or drop corresponding to the calling subscriber. This may be accomplished in a number of different ways and through a variety of means adapted to be associated with the particular form of magnet shown. I have illustrated a practical and simple form of device for this purpose which embodies my preferred construction in this respect and which I will now describe.
  • the core of the electromagnet receives at its front end a removable sleeve (1 which projects slightly beyond the core at its front, where it is screw-threaded for a purpose to be described.
  • the sleeve is divided into front and rear bores or chambers by a channeled bearing d, in which a plunger-rod (1 is mounted for reciprocation.
  • the rod or plunger engages at its inner end with the armature (Z and is surrounded by a spring d within the rear bore of the sleeve interposed be tween the armature and bearing to hold the parts in the relation shown in Fig. 11.
  • the front end of the plunger or rod carries an insulating-disk d, which is adapted to be projected into the recess or socket of a suitable drop-case I when the armature is affectedby the energization of the magnet.
  • the case I is preferably circular in crosssection and is provided with a central tap or screw-threaded aperture to engage the thread of the sleeve (i as clearly shown in Fig. 11.
  • the case is preferably substantially cup-shaped, and the drop or target I is pivoted thereto in a slot i in the lower thickened wall thereof by means of a lug i at the lower end of the drop.
  • the drop is adapted to be engaged at its upper end and retained in normal or non-signaling position by an annular latch i pivoted in a slot in the upper portion of the case and normally lying flush with the periphery thereof.
  • the latch is provided with a depending arm or tail-piece 71 which lies in the path of the disk d of the plunger, whereby when the latter is projected forward into the chamber of the case the latch is raised to release the drop.
  • the drop or target I may be pivoted in the case in such manner as to fall by gravity to the position shown in Figs. 7 and 10 when released by the latch, as by having it normally occupy or stand in a forwardly-inclined position, or the arrangement of the parts may be such that the drop will be projected slightly over the pivot-point by the forward movement of the plunger.
  • a restoring arm or lever K is pivotally supported in the slot "i of the case by means of an upwardly-extending arm is and is provided at its front with a curved or hooked end 7c, against which the drop strikes when in sig' naling position.
  • the hook Zr is in front of the lug i of the drop, and the lower end of the arm 7c rests against a spring-pressed rod N when the parts are assembled.
  • the arm or lever is bulged or thickened in vertical crosssection from the hook toward its rear, and its lower edge is rounded or curved to form a cam edge k projecting in a rearwardly and downwardly direction.
  • the drop or annunciator I normally stands within the case I in substantially the relation shown in Fig. 11, and when the magnet is energized by the incoming signal of the subscriber the armature is drawn within the core against the force of the spring d, raising the latch and allowing or causing the drop to fall to signaling position.
  • the relation of the parts when the drop has fallen is such that the arm K is pressed down by the drop into the path of the plug employed by the operator to connect her instrument with the subscribers line to ascertain the number of the called subscriber desired, the arm or lever presenting its inclined surface k to the handle of the plug and adapted to be raised thereby.
  • the plug P is provided with the usual insulated tip and sleeve portions, which engage the spring 00 and the plug-socket 5, respectively, when the plug is inserted in the jack and also with the usual handle 19, forming a shoulder 19 in the usual manner.
  • the shoulder engages the curved or cam face of the arm or lever and raises the same, whereby the hook is, bearing against the drop or shutter, restores it to place as the arm is raised by the lug, the increasing thickness of the arm or ever in vertical section from front to rear serving to produce this upward thrust.
  • each combined jack and'drop structure is provided with suitable terminals, adapted to cooperate with the board-terminals a and a when the structure is assembled on the board.
  • These frame-terminals are preferably in the form of head-rods n and n, mounted in bores or holes near the lower edge of the block and held in rearward eX- tension thereof by means of suitable springs n inclosed between the block and heads.
  • Each head has an associated contact a and n respectively, through which it preferably passes and with which it is electrically connected by the engagement of the parts and by the associated spring n
  • These contacts are preferably in the form of d-shaped springplates and are inverted on the rear face of the block, their free ends being offset from the block and carried inwardly to overlap, as shown in Fig. 4.
  • These contacts are nor mally disconnected, whereby when the frame is mounted on the board they form normally open terminals of the nightbell circuit, and they are adapted to be brought into contact to close the circuit by means of a rod N, which is mounted in suitable openings in the face-plate and block parallel with and above the plane of the jack-strips.
  • This rod extends into the path of the movement of the lever or arm K and is provided at its rear end with a suitable insulating button or disk, which rests against the spring n
  • a suitable insulating button or disk which rests against the spring n
  • the arm K When the drop falls, its weight causes the arm K to be pressed back to the position shown in Fig. 7, whereby the rod N is forced rearwardly against the stress of the springcontact n which in turn is carried rearwardly to engage the contact a and close the circuit through the night-alarm, which is thereby caused to operate.
  • the positions of the parts when this operation takes place are clearly shown in Fig. 7.
  • the frame-contacts n and n being spring-pressed, engage their corresponding board-terminals with close contact at all times, whereby the contacts are in perfect-electrical connection regardless of the thickness of the rear rail or board.
  • the frame carrying all of the mechanism pertaining to a subscribers line at the central station is attached to the switchboard by means of the screw-bolts a IIO and (1/, this placing the electromagnet in the circuit of the subscribers line over which. it presides, the electrical connections being established by means of the line-terminals engaging the screw-bolts in any desired manner.
  • the night-bell terminals of the frame are likewise placed in electrical connection with the corresponding terminals of the board.
  • the annunciator bears the arm K downwardly and rearwardly to close the normally open night alarm spring-contacts a and a by means of the sliding rod N, completing the night-bell circuit.
  • the plug When the plug is inserted in the jack, its tip engages the spring-strip .r, causing its electrical disconnection from the strip 1 electrically removing the electromagnet from the subscribers line and placing the cord-connectors of the plug in electrical connection with the subscribers line in order to permit the operator to listen over said line to ascertain the number of the called subscriber and afterward connect the two subscribers in circuit.
  • the insertion of the plug also mechanically removes the arm K, causing the hook thereof to raise the drop into its normally elevated position, where it is re tained by the latch, the deenergizing of the electromagnet by the separation of the strips :10 and y permitting the armature to return to its normal position and retracting the plunger within the sleeve.
  • the arm K is raised, the stress of the spring-contact n moves the rod N to its normal position and automatically opens the night-bell circuit.
  • the devices connected with the subscribers lines are compactly arranged in a unitary structure which is capable of bodily removal from. and replacement in the board and enables the electrical connections necessary to establish the proper circuits through the device to be made by the act of making the mechanical attachments.
  • the provision for readily disassembling the magnet and its associated parts from the frame and these several parts from each other for repair and replacement is important, as it enables an unskilled operator to detach and replace any part which may have become worn or out of order.
  • the magnet, together with the drop devices may be detached from the frame merely by forcing it out from engagement with the retaining-spring c".
  • the drop and armature may in turn be detached from the magnet by sliding the sleeve d out of the core.
  • the drop shutter and its immediate associated parts included within the drop-case may be detached from the sleeve by unscrewing the connection. In this manner any part may be removed and replaced by an ordinary operator.
  • a telephone-switchboard the combination with a frame, having contacts normally included in the line-circuit, of an electromagnet having a sleeve and a tip electrically connected with its coil and engaging the contacts when the electromagnet is in place on the frame.
  • a telephone-switchboard the combination with a frame, consisting of a front plate having an opening and of a block having a socket, and line-contacts in the socket, of an electromagnet having a sleeve and a tip electrically connected with its coil and adapted to enter said socket and engage with said contacts.
  • a telephone-switchboard the combination with a frame, consisting of a front plate having an opening and of a block having a socket, and spring-pressed line-contacts in the socket, of an electromagnet having a sleeve and a tip electrically connected with its coil and adapted to electrically connect with said contacts when the sleeve and tip enter the socket.
  • a telephone-switchboal consisting of a front plate having an opening and. a block having a socket provided with openings in its wall, plates on the block in electrical connection with the subscribers line and having springpressed contacts in said openings, of an electromagnet having a sleeve and a tip at its rear in electrical connection with its coil and adapted. to enter said socket to engage said contacts.
  • a telephone-switchboard the combination with a frame, consisting of a front plate having an opening and of a block having a socket provided with openings in its top, plates on the block in electrical. connection with the subscribers line and having spring-contacts in said openings, of an electromagnet having a sleeve and a tip at its rear in electrical connection with its coil and engaging said contacts when the electromagnet is in position, said tip having a neck to receive one of the spring-contacts.
  • a telephone-switchboard the combination with a frame, consisting of a front plate having a shouldered opening and of a block having a socket provided. with openings, of an electromagnet having a front spool adapted to said shouldered opening, a core provided with a sleeve, a plug in the sleeve, a tip on the plug having a neck, said tip and sleeve being in electrical connection with the magnet-coil, a spring-contact engaging the neck to prevent the accidental displacement thereof, and a second spring contact engaging the sleeve, said contacts be mg lncluded 1n the subscribers hne.
  • the eom'bi 1 plate having a spring 0 provided with a contact 0 in the opening 0 and a second lineplate 0 having a spring-lug in the opening 0, said contact and lug being in electrical connection with the tip and sleeve respectively.
  • a telephone-switchboard thecombination with an electromagnet having a hollow core, a s ring-pressed armature sliding'in the core, a s eeve adapted to the core, and a plunger moving with the armature and passing through the sleeve, of a drop-case mounted on the sleeve andhaving a pivoted annunciator, and a latch engaging the annunciator and having a tailpiece locatedinthe path of and engaged by the plunger, when the armature isattracted by the electromagnet, to release the annunciator.
  • a telephone-switchboard the combination with an electromagnet having a hollow core, a spring-pressed armature sliding in the core, a plunger moving with the armature, and a sleeve removably fitting the free end of the core, of a drop-case having a screw connection with the sleeve and carrying a pivoted drop, and a latch having a tail located in the path of the plunger and engaged by the latter to release the drop.
  • a telephoneswitchboard the combination with an electromagnet having a hollow core, an armature sliding therein, a sleeve removably fitting within the core, and a spring-pressed plunger moving with the armature and passing through the sleeve, and of a drop-case on the sleeve, a drop pivoted on the case, and a latch for the I drop in the path o'fthe plunger.
  • Atelephone-switchboard the combination with an electromagnet having a'hol- 'lOW core, an armature slidingrthereim-a sleeve removably adapted to the-core, a spring-retracted plunger on the armature passing throughthe sleeve, of a'drop-case 'hav'ing'a screw connection with the sleeve, a drop-pivoted on the case, and a'latch normally engaging the drop and having a tailpiece in the path of the-plunger.
  • a drop,-and'an electromagnetic latch device for said drop of an arm below and adapted to-engage thefront face of the drop and to be-depressedthereby into thepath of a plug, and a plug adaptedto engagethe arm to restore the-drop asit is inserted-in the jack.
  • the combination with a jack, and an electromagnet having an armature, of a drop ivotally mounted on the electromagnet, a atch for the drop controlled by the armature, an arm mounted on the electromagnet and adapted to restore the drop, and a plug adapted to move the arm as it enters the jack.
  • a telephone-switchboard the combination with a jack, and an electromagnet having a sliding armature, of a drop pivotally mounted on the electromagnet, a latch for the drop carried by the electromagnet and controlled by the armature, an arm adapted to restore the drop and having a cam adapted to enter the path of a plug when the drop falls, and a plug adapted to ooact with the cam to raise the arm as it enters the jack.
  • a telephone-switchboard the combination with a jack, and an electromagnet having an armature, of a drop-case mounted on the electromagnet, a drop pivoted on the case, a latch for the drop pivoted on the case and controlled by the armature, a lever or arm pivoted on the case below the drop and having a projection engaging with the drop, a cam on the arm, and a plug which when the drop is in signaling position engages the cam as it enters the jack.
  • a telephone-switchboard the combination with a frame carrying an electromagnetic drop device at its front, terminals of a normally open night-bell circuit on the rear of the frame, a rod, and a drop-restoring arm actuated by the drop when the latter falls to move the rod and close said circuit through said terminals.
  • a telephone-switchboard the combination with a frame, an electromagnetic drop device supported therein, and a droprestoring arm, of terminals of a normally open night-bell circuit comprising inverted- J-shaped spring-strips having their short ends overlapping but normally separated, and a rod in contact with one of said terminals and extending into the path of the restoringarm, whereby when the drop falls the restoring-arm is pressed against the rod so that the latter is retracted to close the circuit through said spring-strips.
  • a telephone-switchboard the combination with a board or cabinet having suitable contacts normally included in an open night-bell circuit, of a frame supporting the electromagnetic drop device, terminals on the frame adapted to be closed by the opera tion of the drop device, and framecontacts in electrical connection with said terminals and comprising spring-pressed rods adapted to contact with said board-contacts when the frame is assembled in position on the board.
  • a telephone-switchboard the combination with a board or cabinet having contacts of a night-bell circuit, of a frame adapted to be mounted 011 said board, an electromagnetic signal device on said frame, terminals adapted to be placed in electrical connection by the operation of the signal device, and frame-contacts in electrical connection with said terminals and comprising headed rods mounted on said frame and coil-springs on the rods between the heads and frame.

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Description

PATENTED JUNE 26,
s EHEETEEEET 1. Y 4/ l w r6752??? I W E MoGORMIGK TELEPHONE SWITOHBOARD.
APPLICATION FILED AUG. 26, 1991.
r f? I Z a as d J) No. 824,431. I PATENTED JUNE 26, 1906.-
W. E. MCCORMICK.
TELEPHONE SWITGHBOARD.
APPLICATION FILED AUG. 26, 1901.
3 SHEETS-SHEET Z No. 824,431. PATBNTED JUNE 26, 1906.
W. E. MOGORMIGK. TELEPHONE SWITGHBOABD.
APPLIGATION FILED AUG.26, 1901.
3 SHEETS-SHEET 3.
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jaw 55%? I Mm m g munew, a. anmm 2a., W OTOJJYHUGRAPHERE'WLSHINCJQln c c.
UNITED STATES PATENT WILLIAM E. MCCORMICK, "OF CHICAGO, ILLINOIS, ASSIGNOR TO INTERNATIONAL TELEPHONE MANUFACTURING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.
TELEPHONE-.SWITCHBOAR D.-
Specification of LettersPatent.
. ';at.enteo. June 26,1906.
Application filedAugustZG, 1901. SerialNo- 73.365.
To all zu/wm it may concern:
Be it known that I, WILLIAM 'E. MoCoR' MICK, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Telephone-Switch boards; and I hereby declarethe'following'to be a full, clear, and exact description of the invention, such as will enable others skilled in'the art to which'it appertains to make and use the same.
My invention relates to telephone-switchboards, and more particularly to that class of switchboards wherein all of the mechanical and electrical devices pertaining to each subscribers line atthe central station areincluded in a unitary structure capable of being placed in and removed from the switchboard as a single device.
The principal obj ect-of my invention isto provide a line-jack and annunciator of the combined or unitary type wherein all the mechanism, including all of the electrical devices associating with or cooperating with the jack, drop, and plug pertaining .to each subscribers line at the central station, is embodied in a single structure capable of'bodily assemblage in and disassemblage from the switchboard frame or cabinet.
Another object ofmy invention is to provide an improved device of'this unitary char-' acter wherein the magnet and drop, together with the operating parts-ofthe drop, may be readily disassembled from the frame of the unitary structure for repairs or replacement and easily and quickly replacedthere'in.
Another object of my invention is to provide an annunciator of the drop-shuttertype having simple and efficient means to mechanically and automatically restore the drop .by means ofthe plug.
A further object of my invention isto provide a novel and simple construction and arrangement of all of the parts comprising a combined or unitary drop and jack structure, whereby all the electrical devices of each unitary device may be automatically included in their proper circuits by the placing of the device in position on the board.
A further object is to provide novel and efficient means for closing the night-bell circuit when the drop falls to'signaling position.
Other objects of my invention will be apparent from the disclosure thereof.
l/Vith the objects of my invention in View the invention consists in .certain novel features of construction and in the combinations and arrangements of parts, asfhereinafter set forth, .and pointed out in-the claims.
In the accompanying drawings, which illustrate the preferred organization of ,my invention, Figure -1 is a side elevation of a combined or unitaryjjack and drop structure exemplifying my invention. 'Fig. ,2 is a frontelevation thereof with the drop or annunciator in its normal or non-signaling position. Fig. 3 is a sideelevationof the parts shown in Fig. 1, 'but taken on.the sideopposite to'that shown in Fig. 1. Fig. 4isa-rear elevation illustrating various mechanicaland electricaldevices employed. '5 isa top plan view. Fig. '6 is .a bottom plan View. Fig. '7 is a vertical sectional view showing the drop 'in signaling position and the plug in position to enter the jack. Fig. 8 is a detail view of the core and actuating-coil of1the s0- lenoid or electromagnet employed. Fig. 9. is a detail view of the drop-caseand,slidingarmature employed, the parts illustrated in Figs. 8 and 9 being shown as disassembled upon theircommon axial line. Fig. lO'isa front elevation of the structure, showing the drop in signaling position. Fig. 1-1 'isa vertical central sectional view of the structure ion an enlarged scale. Fig. 12 is adetail view :ofpart of the frame of'the combined jackand :drop structure, together with [the solenoid employed, and illustrates the method of.assembling and disassembling *these parts. Fig. 13'is-a diagrammatic view of the circuits and circuit connections ofmy combinedjack and drop structure at the switchboard.
The reference-letter A represents'a :portion of a switchboard cabinet or supportfsudhas a rear-rail thereof, provided with'holesfor the passage of screw threaded rods a and .a", which are electrically connected with their respective line-jacks in .a manner ihereinafter explained and by means of which .theframes ofthe j ackanddrop structures and the associated parts are secured to the cabinet or back of'the switchboard by suitable thumbvnuts a which'bindthe parts together, andto which the subscribers line-wires are conneeted, as by means of suitable clips (0 providing soldering-terminals, all as shown in Figs. 1 and 7. The part A is also provided with suitable strips a and a, forming the board-terminals of a normally open night alarm circuit, including a battery and a signal device, as shown in Fig. 13, and which are adapted to be engaged by suitable corresponding frame-terminals, as hereinafter described.
The frame of each combined jack and drop structure comprises a face-plate B and a rear block C, which are rigidly connected together in alinement by a metallic conducting-plate c. The plate 0 is secured by screws or other suitable means to one side of the block C, where it is in electrical connection with the screw-rod a and is provided at its forward end with an angular extension 0, which is suitably tapped for screw-threaded electrical connection with a plug-socket 7) of the jack, which passes through the face-plate and is preferably flared at its outer end to provide an annular shoulder to securely bind the parts together, as well as to make an enlarged mouth for the plug.
The plate B is provided. with a suitable bore or passage b having a shoulder b", and the block 0 is provided with a rearwardlyextending socket or channel 0, which is arranged in the same axial line as the passage b and has upwardly-directed openings 0 and c in its topwall, leading out upon the upper face of the block. A suitable conductingplate 0 is attached to the rear face of the block and is provided with a forwardly-extending spring-arm c, which has a downwardly-bent and preferably rounded portion or terminal a lying in the opening (2 and projecting into the socket 0 A second conducting-plate is attached to the side of the block under and in electrical connection with the plate 0 and has an inwardly-directed spring-arm which carries a lug c projecting through the opening 0 into the socket 0 This organization of the parts is clearly shown in Figs. 4, 5, 7, 11, and 12. A conductingplate 0*", in electrical connection with the screw a, is attached to the side of the block opposite the plate 0 and is extended around the lower portion of the block to support an intermediate strip 0 of insulating material, which closes suitable slots or kerfs in the bottom edge of the block in which suitable conducting-strips :0 and y are held. These strips extend forwardly different distances in the line of the plug-socket b and are normally in electrical connection near their front ends, as shown in Fig. 6. The strip :0 constitutes the spring of the jack and has a suitable bent end to engage the neck of the tip of the plug, whereby when the plug is inserted in the jack the electrical connection between the strips is broken and the plug is held. in place within the jack. The strip 90 is in electrical connection by a suitable conductor 90 with the screw-rod a, and the strip y is in electrical connection by a suitable conductor y with the plate 0 The reference-letter D represents a solenoid adapted to be removably mounted in the frame and having a hollow core (1, in which plays a sliding armature cl, which may be solid or hollow and is of such length that when the solenoid is energized it is drawn into the core in order to release the drop or annunciator, as hereinafter described. The helix is wound upon the core, which carries the usual heads and (Z and the core projects beyond the rear head in a sleeve (1 and has its rear end closed by a suitable block or plug (1 of insulating material, carrying a conducting-tip d", having a reduced neck or diameter (F. The terminals of the helix are electrically connected with the sleeve d and the tip d by the conductors 1 and 2, respectively, the conductor 2 passing through an insulating spool in the sleeve to the interior thereof, as clearly shown in Fig. 11.
The solenoid fits within the frame and is readily removed from and replaced therein, the spool d entering the opening Z) and engaging the shoulder b" to limit the position of the parts, and the sleeve and tip entering the socket 0 where the contacts 0 and c engage 5 the tip and sleeve terminals, respectively, of the helix, the spring-contact 0 serving to hold the solenoid against accidental displacement. When in position in the frame the solenoid is automatically connected in the subscribers line-circuit, which is traced through the screw a, connection as, strip at, strip y, connection 1 plate 0 tip (1, connection 2, through the helix and connection 1. to sleeve d, lug a, plate 0 plate 0 to screw a, whereby the helix is energized when a subscriber sends an incoming signal.
The energization of the helix of the magnet is employed to operate the line-signal or drop corresponding to the calling subscriber. This may be accomplished in a number of different ways and through a variety of means adapted to be associated with the particular form of magnet shown. I have illustrated a practical and simple form of device for this purpose which embodies my preferred construction in this respect and which I will now describe.
The core of the electromagnet receives at its front end a removable sleeve (1 which projects slightly beyond the core at its front, where it is screw-threaded for a purpose to be described. The sleeve is divided into front and rear bores or chambers by a channeled bearing d, in which a plunger-rod (1 is mounted for reciprocation. The rod or plunger engages at its inner end with the armature (Z and is surrounded by a spring d within the rear bore of the sleeve interposed be tween the armature and bearing to hold the parts in the relation shown in Fig. 11. The front end of the plunger or rod carries an insulating-disk d, which is adapted to be projected into the recess or socket of a suitable drop-case I when the armature is affectedby the energization of the magnet.
The case I is preferably circular in crosssection and is provided with a central tap or screw-threaded aperture to engage the thread of the sleeve (i as clearly shown in Fig. 11. The case is preferably substantially cup-shaped, and the drop or target I is pivoted thereto in a slot i in the lower thickened wall thereof by means of a lug i at the lower end of the drop. The drop is adapted to be engaged at its upper end and retained in normal or non-signaling position by an annular latch i pivoted in a slot in the upper portion of the case and normally lying flush with the periphery thereof. The latch is provided with a depending arm or tail-piece 71 which lies in the path of the disk d of the plunger, whereby when the latter is projected forward into the chamber of the case the latch is raised to release the drop. The drop or target I may be pivoted in the case in such manner as to fall by gravity to the position shown in Figs. 7 and 10 when released by the latch, as by having it normally occupy or stand in a forwardly-inclined position, or the arrangement of the parts may be such that the drop will be projected slightly over the pivot-point by the forward movement of the plunger.
A restoring arm or lever K is pivotally supported in the slot "i of the case by means of an upwardly-extending arm is and is provided at its front with a curved or hooked end 7c, against which the drop strikes when in sig' naling position. The hook Zr is in front of the lug i of the drop, and the lower end of the arm 7c rests against a spring-pressed rod N when the parts are assembled. The arm or lever is bulged or thickened in vertical crosssection from the hook toward its rear, and its lower edge is rounded or curved to form a cam edge k projecting in a rearwardly and downwardly direction.
The drop or annunciator I normally stands within the case I in substantially the relation shown in Fig. 11, and when the magnet is energized by the incoming signal of the subscriber the armature is drawn within the core against the force of the spring d, raising the latch and allowing or causing the drop to fall to signaling position. The relation of the parts when the drop has fallen is such that the arm K is pressed down by the drop into the path of the plug employed by the operator to connect her instrument with the subscribers line to ascertain the number of the called subscriber desired, the arm or lever presenting its inclined surface k to the handle of the plug and adapted to be raised thereby.
(Shown in Fig. 7.)
The plug P is provided with the usual insulated tip and sleeve portions, which engage the spring 00 and the plug-socket 5, respectively, when the plug is inserted in the jack and also with the usual handle 19, forming a shoulder 19 in the usual manner. When the plug is inserted in the jack, the shoulder engages the curved or cam face of the arm or lever and raises the same, whereby the hook is, bearing against the drop or shutter, restores it to place as the arm is raised by the lug, the increasing thickness of the arm or ever in vertical section from front to rear serving to produce this upward thrust.
The frame of each combined jack and'drop structure is provided with suitable terminals, adapted to cooperate with the board-terminals a and a when the structure is assembled on the board. These frame-terminals are preferably in the form of head-rods n and n, mounted in bores or holes near the lower edge of the block and held in rearward eX- tension thereof by means of suitable springs n inclosed between the block and heads. Each head has an associated contact a and n respectively, through which it preferably passes and with which it is electrically connected by the engagement of the parts and by the associated spring n These contacts are preferably in the form of d-shaped springplates and are inverted on the rear face of the block, their free ends being offset from the block and carried inwardly to overlap, as shown in Fig. 4. These contacts are nor mally disconnected, whereby when the frame is mounted on the board they form normally open terminals of the nightbell circuit, and they are adapted to be brought into contact to close the circuit by means of a rod N, which is mounted in suitable openings in the face-plate and block parallel with and above the plane of the jack-strips. The front end of this rod extends into the path of the movement of the lever or arm K and is provided at its rear end with a suitable insulating button or disk, which rests against the spring n When the drop falls, its weight causes the arm K to be pressed back to the position shown in Fig. 7, whereby the rod N is forced rearwardly against the stress of the springcontact n which in turn is carried rearwardly to engage the contact a and close the circuit through the night-alarm, which is thereby caused to operate. The positions of the parts when this operation takes place are clearly shown in Fig. 7. The frame-contacts n and n, being spring-pressed, engage their corresponding board-terminals with close contact at all times, whereby the contacts are in perfect-electrical connection regardless of the thickness of the rear rail or board.
In operation the frame carrying all of the mechanism pertaining to a subscribers line at the central station is attached to the switchboard by means of the screw-bolts a IIO and (1/, this placing the electromagnet in the circuit of the subscribers line over which. it presides, the electrical connections being established by means of the line-terminals engaging the screw-bolts in any desired manner. The night-bell terminals of the frame are likewise placed in electrical connection with the corresponding terminals of the board. When a call is made by a subscriber, the electrical current energizes the electromagnet and its armature is caused to move within the core, raising the latch and permit ting the annunciator to fall. The annunciator bears the arm K downwardly and rearwardly to close the normally open night alarm spring-contacts a and a by means of the sliding rod N, completing the night-bell circuit. When the plug is inserted in the jack, its tip engages the spring-strip .r, causing its electrical disconnection from the strip 1 electrically removing the electromagnet from the subscribers line and placing the cord-connectors of the plug in electrical connection with the subscribers line in order to permit the operator to listen over said line to ascertain the number of the called subscriber and afterward connect the two subscribers in circuit. The insertion of the plug also mechanically removes the arm K, causing the hook thereof to raise the drop into its normally elevated position, where it is re tained by the latch, the deenergizing of the electromagnet by the separation of the strips :10 and y permitting the armature to return to its normal position and retracting the plunger within the sleeve. When the arm K is raised, the stress of the spring-contact n moves the rod N to its normal position and automatically opens the night-bell circuit.
By constructing a combined jack and drop in the manner above described the devices connected with the subscribers lines are compactly arranged in a unitary structure which is capable of bodily removal from. and replacement in the board and enables the electrical connections necessary to establish the proper circuits through the device to be made by the act of making the mechanical attachments. The provision for readily disassembling the magnet and its associated parts from the frame and these several parts from each other for repair and replacement is important, as it enables an unskilled operator to detach and replace any part which may have become worn or out of order. The magnet, together with the drop devices, may be detached from the frame merely by forcing it out from engagement with the retaining-spring c". The drop and armature may in turn be detached from the magnet by sliding the sleeve d out of the core. The drop shutter and its immediate associated parts included within the drop-case may be detached from the sleeve by unscrewing the connection. In this manner any part may be removed and replaced by an ordinary operator.
Having described my invention, what I claim as new, and desire to secure by Letters Patent, is-
1. In a telephone-switchboard, the combination with a frame, having contacts normally included in the line-circuit, of an electromagnet having a sleeve and a tip electrically connected with its coil and engaging the contacts when the electromagnet is in place on the frame.
2. In a telephone-switchboard, the combination with a frame, consisting of a front plate having an opening and of a block having a socket, and line-contacts in the socket, of an electromagnet having a sleeve and a tip electrically connected with its coil and adapted to enter said socket and engage with said contacts.
3. In a telephone-switchboard, the combination with a frame, consisting of a front plate having an opening and of a block having a socket, and spring-pressed line-contacts in the socket, of an electromagnet having a sleeve and a tip electrically connected with its coil and adapted to electrically connect with said contacts when the sleeve and tip enter the socket.
4. In a telephone-switchboal'd, the combination with a frame, consisting of a front plate having an opening and. a block having a socket provided with openings in its wall, plates on the block in electrical connection with the subscribers line and having springpressed contacts in said openings, of an electromagnet having a sleeve and a tip at its rear in electrical connection with its coil and adapted. to enter said socket to engage said contacts.
5. In a telephone-switchboard, the combination with a frame, consisting of a front plate having an opening and of a block having a socket provided with openings in its top, plates on the block in electrical. connection with the subscribers line and having spring-contacts in said openings, of an electromagnet having a sleeve and a tip at its rear in electrical connection with its coil and engaging said contacts when the electromagnet is in position, said tip having a neck to receive one of the spring-contacts.
6. In a telephone-switchboard, the combination with a frame, consisting of a front plate having a shouldered opening and of a block having a socket provided. with openings, of an electromagnet having a front spool adapted to said shouldered opening, a core provided with a sleeve, a plug in the sleeve, a tip on the plug having a neck, said tip and sleeve being in electrical connection with the magnet-coil, a spring-contact engaging the neck to prevent the accidental displacement thereof, and a second spring contact engaging the sleeve, said contacts be mg lncluded 1n the subscribers hne.
7. In a telephone-switchboard,the eom'bi 1 plate having a spring 0 provided with a contact 0 in the opening 0 and a second lineplate 0 having a spring-lug in the opening 0, said contact and lug being in electrical connection with the tip and sleeve respectively.
8. In a telephone-switchboard, the combination with an electromagnet having a spring-pressed armature and a plunger moving with the armature, of a hinged drop supported on the front of the electromagnet, and a hinged latch having a portion thereof located in the path of and actuated by the plunger to release the drop.
9. In a telephone-switchboard, the combination with an electromagnet havinga hollow core, a spring-pressed armature sliding therein and provided with a plunger moving with the armature, ofa removably-mounted drop, and a-pivoted latch having a tail-piece which projects into the path of and is actuated by the plunger to release'the drop.
10. In a telephone-switchboard, thecombination with an electromagnet having a hollow core, a s ring-pressed armature sliding'in the core, a s eeve adapted to the core, and a plunger moving with the armature and passing through the sleeve, of a drop-case mounted on the sleeve andhaving a pivoted annunciator, and a latch engaging the annunciator and having a tailpiece locatedinthe path of and engaged by the plunger, when the armature isattracted by the electromagnet, to release the annunciator.
11. In a telephone-switchboard, the combination with an electromagnet having a hollow core, a spring-pressed armature sliding in the core, a plunger moving with the armature, and a sleeve removably fitting the free end of the core, of a drop-case having a screw connection with the sleeve and carrying a pivoted drop, and a latch having a tail located in the path of the plunger and engaged by the latter to release the drop.
12. In a telephoneswitchboard, the combination with an electromagnet having a hollow core, an armature sliding therein, a sleeve removably fitting within the core, and a spring-pressed plunger moving with the armature and passing through the sleeve, and of a drop-case on the sleeve, a drop pivoted on the case, and a latch for the I drop in the path o'fthe plunger.
13. In a telephone-switchboard, the-combination with an eleotromagnethavinga-hollow core, an armature sliding "herein, asleeve removably fitting the core, a spring ret-racted plunger on tho rmziure passing throughthe sleeve, ofa drop-case-having a screw connection with the sleeve, a droppivoted on the case, anda'latch engaged by the plungernpon the movement of the armature to release'the drop.
14. In atelephone-switchboard, the combination with an electromagnet having a'hol- 'lOW core, an armature slidingrthereim-a sleeve removably adapted to the-core, a spring-retracted plunger on the armature passing throughthe sleeve, of a'drop-case 'hav'ing'a screw connection with the sleeve, a drop-pivoted on the case, and a'latch normally engaging the drop and having a tailpiece in the path of the-plunger.
15. In a 'telephone-switchboard,-the combination with a jack, a drop,-and'an electromagnetic latch device for said drop, of an arm below and adapted to-engage thefront face of the drop and to be-depressedthereby into thepath of a plug, and a plug adaptedto engagethe arm to restore the-drop asit is inserted-in the jack.
16. In a telephone-switchboard, the combination withajack, a drop,and an electromagnetic latch device for said drop, of an armpivotedabove the jack and normallyout of the path of a plug, a hook on the arm adapted to coact with the drop to movelthe arm into the path of a plug when the drop falls and to restore the drop when the arm rises, and a plug adapted to raise the arm'as it is inserted in the jack.
17. In a telephone-switchboard, thecombination with a ack, a drop, andanelectromagnetic latch device for said -drop,-of an arm pivoted intermediate thedrop and jack and normally out of the pathof the plug,-a hookon the armto cooperate With-the drop, a-cam on the arm in thepathof the plugwhen the arm is down, and a plug to engage :the camto restorethe drop.
18. In a telephone-switchboard, the combinationwitha jack, a drop, and an electrornagnetic'latchdevice'for saiddrop of an arm pivoted between the drop and jack normally above the path of a plug and adapted to be depressed into said path by the drop, a hook on the arm to restore the drop when the arm is raised, and a cam on the arm to cooperate with a plug to raise the arm to restore the dro 18. In a telephone-switchboard, the combination with a jack, and an electromagnet having an armature, of a drop ivotally mounted on the electromagnet, a atch for the drop controlled by the armature, an arm mounted on the electromagnet and adapted to restore the drop, and a plug adapted to move the arm as it enters the jack.
20. In a telephone-switchboard, the combination with a jack, and an electromagnet having a sliding armature, of a drop pivotally mounted on the electromagnet, a latch for the drop carried by the electromagnet and controlled by the armature, an arm adapted to restore the drop and having a cam adapted to enter the path of a plug when the drop falls, and a plug adapted to ooact with the cam to raise the arm as it enters the jack.
21. In a telephone-switchboard, the combination with a jack, and an electromagnet having an armature, of a drop-case mounted on the electromagnet, a drop pivoted on the case, a latch for the drop pivoted on the case and controlled by the armature, a lever or arm pivoted on the case below the drop and having a projection engaging with the drop, a cam on the arm, and a plug which when the drop is in signaling position engages the cam as it enters the jack.
22. In a telephone-switchboard, the combination with a frame carrying an electromagnetic drop device at its front, terminals of a normally open night-bell circuit on the rear of the frame, a rod, and a drop-restoring arm actuated by the drop when the latter falls to move the rod and close said circuit through said terminals.
23. In a telephone-switchboard, the combination with a frame carrying an electromagnetic drop device at its front, of springterminals of a normally open night-bell circuit on the rear of the frame, and a rod normally held by one of said terminals in position to be moved by the drop to close the circuit through said terminals as the drop falls.
24. In a telephone-switchboard, the combination with a frame, an electromagnetic drop device supported therein, and a droprestoring arm, of terminals of a normally open night-bell circuit comprising inverted- J-shaped spring-strips having their short ends overlapping but normally separated, and a rod in contact with one of said terminals and extending into the path of the restoringarm, whereby when the drop falls the restoring-arm is pressed against the rod so that the latter is retracted to close the circuit through said spring-strips.
25. Ina telephone-switchboard, the combination with a frame, an electromagnetic drop device carried thereby, and a drop-restoring arm, of terminals a and n of a nightbell circuit normally out of contact, and a rod N normally held by one of said terminals in the path of the restoring-arm and adapted to be retracted by the latter when the drop falls.
26. In a telephone-switchboard, the combination with a frame and an electromag netic drop device supported thereon, of spring-strips constituting normally separated terminals of a night-bell circuit, connections between the drop device and terminals whereby electrical connection is established between said terminals when the drop falls, frame-contacts comprising rods mounted in the frame and passing through said terminals, and springs adapted to project said rods rearwardly.
27. In a telephone-switchboard, the combination with a board or cabinet having suitable contacts normally included in an open night-bell circuit, of a frame supporting the electromagnetic drop device, terminals on the frame adapted to be closed by the opera tion of the drop device, and framecontacts in electrical connection with said terminals and comprising spring-pressed rods adapted to contact with said board-contacts when the frame is assembled in position on the board.
28. In a telephone-switchboard, the combination with a board or cabinet having contacts of a night-bell circuit, of a frame adapted to be mounted 011 said board, an electromagnetic signal device on said frame, terminals adapted to be placed in electrical connection by the operation of the signal device, and frame-contacts in electrical connection with said terminals and comprising headed rods mounted on said frame and coil-springs on the rods between the heads and frame.
In testimony whereof I affix my signature in the presence of two witnesses.
W. E. MCCORMICK.
IVitnesses ROBERT K..GUsTAFsoN, JOSIAH MoRoBERTs.
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