US673504A - Telephone-switchboard. - Google Patents

Description

No, 623,504. Patented may 7, 190|.

l. .1. Kusel.. TELEPHUNE SWITCHBUARD.

(Application led Sept. 27, 1900.)

3 Sheets-Sheet l.

(No Model.)

No. 673,5114.v

(No Mode.)

I. JI' KUSEL.

TELEPHONE SWITCHBOABD.

(Application filed Sept. 27, 1900.)

Patented May 7, |90l..

3 Sheets-Sheet 2,

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UNITED. STATES PATENT OFFICE.

ISIDOR J. KUSEL, OF CHICAGO, ILLINOIS, ASSIGNOR TO EUREKA ELECTRIC COMPANY, OF SAME PLACE.

TELEPHONE-SWITCHBOARD.

SPECIFICATION forming part of Letters Patent N o. 673,504, dated May '7, 1901.

Application iiled September 27, 1900. Serial No. 31,258. (No model.)

To a/ZZ whom it may concern: showing the connection of the subscribers Be it known that I, ISIDOR J. KUSEL, a citicircuit to the jack and drop.

z'en of the United States, residing at Chicago, Like letters of reference indicate correin the county of Cook and State of Illinois, sponding parts throughout the several views.

have invented certain new and useful Im- This combined jack and drop is intended 55 provements in Telephone Switchboards, of for use in connection with telephone-switchwhich the following is a specification. boards of any of the ordinary forms, and, as

The object of this invention is the producin other switchboards,two plugs are usedtion' of a combined spring-jack and drop for to wit, the answering-plug and the ringing- 1o telephone-switchboards which shall be complug-the former being the plug which the 6o pact in form, simple and strong in its conoperator inserts into the jack on. the circuit struction,easilyattachable t0 the switchboard of the calling subscriber and the latter the or removable therefrom, wherein electrical one inserted into the jack on the circuit of connections between the lines of the boardY the called subscriber. These plugs are eiecand those of the jack and drop are made or trically connected, and in the circuit formed 65 broken by said acts of attachment or detachbetween them it is intended that the operment, wherein the action of the magnetic ators circuit may be included or bridged coil is strengthened by a tubular shell of a in when it is necessary that she should listen conducting metal, wherein the annunciatoror ringlon any subscribers line.

zo plate falls sidewise in a plane parallel with A night-bell circuit, normally open, is ar- 7o the face of the board, wherein said annunranged to be closed upon the falling of the ciator-plate is automatically restored to poannunciator-plate, whereby the alarm-bell of sition by the insertion of a plug into the jack, said circuit is caused to ring continuously un- Wherein the jack is not liable to accidental til by the restoration of the fallen plate the z 5 displacement by the jarring of the switchnight-bell circuit is again broken. The elec- 75 board, and embodying the other and further trical connections for this night-bell circuit improvements herein set forth. A and for the subscribers lines are permanently In the accompanying drawings, Figure lis secured to contact-points on a stationary pora front elevation of this improved jack and tion of the switchboard, which said contactdrop. Fig. 2 is a rear elevation of the same, points are arranged to engage corresponding 8o showing the means for mechanically attachcontact-points on the jack and drop and in ing the jack and drop to the switchboard and electrical connection with the proper lines of the contacts forits electricalconnection therethe latter, by which arrangement the act of with. Fig. 3 is a side elevation of said jack lmechanically clamping or securing the jack and drop. Fig. et is a similar view showing and drop to the switchboard electrically con- 85 the opposite side of said jack and drop. Fig. nects the lines therein with the 'lines of the 5 is a plan View of the same. Fig. Bis a lonboard and whereby the detachment of said gitudinal vertical central section thro ugh said securing means interrupts said electrical conjack and drop, the tubular shell surround-I nection. A tubular shell of soft-iron sur- 4o ing the coil being shown entire. Fig. 7 is a rounds the electromagnet and is connected 9o longitudinal central section through the tubuwith the core of said magnet, its purpose belar shell surrounding the coil. Fig. 8 is a ing to intercept the magnetic lines of force detail view in section, showing the means for which envelop the coil, offering said lines of loosely mounting the plug which completes force a good conductor from one pole of the the nightbell circuit when the annunciatormagnet to the opposite pole thereof, thus 95 plate falls. Fig. 9 is a diagrammatic view preventing their mingling with similar lines showing the night-bell circuit and a subof adjacent coils and by said mingling proscribers line in connection with the jack and ducing cross-talk on contiguous lines. drop of my invention. Fig. l0 is a horizon- In theembodiment here shown of this in- 5'o tal sect-ion on dotted line 10 10 of Fig. 9, vention a clamping screw-bolt forms the seroo curing means between the jack and drop and the switchboard, and the mere tightening or loosening of said bolt connects said jack and drop with the switchboard or disconnects it therefrom electrically as well as mechanically.

In the construction of this jack and drop I provide an electromagnet A, having the core A' and the usual winding A2. A tubular shell A3, permanently closed by the end A4, surrounds said magnet and is held in position relative to the latter by means of a screw A5, passing through an opening in the end A4 and into an axial screw-threaded opening in said core. The screw A5 also holds the electromagnet and its shell in position upon the supporting-frame A6. A tilting latch-bar A7 is pivotally mounted in supports A8 upon the tubular shell A3 near the open end thereof. This latch-bar is of non-magnetic material,as brass, and has secured to its downwardly-extending forward end the armature A9 for said electromagnet. This armatureis a circular disk corresponding in diameter to that of the tubular shell A3. The opposite end of the tilting latch-bar is adapted to engage and hold elevated the annunciator-plate, which will next be described. y

B is a shaft capable of an oscillatory motion, journaled in the supporting-frame A4. At its forward end it bears the annunciatorplate B', rigidly secured to said shaft at one of its lower corners. The rear end of the shaft B carries thedetent-nger B2, rigidly fixed to said shaft, which detent-finger is adapted to be engaged by the latch-bar A'I and be held thereby in an elevated position. When an electric current energizes the electromagnet A, the armature A9 is attracted toward the core A', lifting the rear end of the pivoted latch-barA7 from its engagement wit-h the detent-ii'nger B2 and permitting the annunciator-plate B to fall. The shaft B also has a projecting lug B3, bearing at its outer end the plug B4, loosely mounted on said lug, the object of this plug being to complete the night-bell circuit when the annunciator-plate falls. The plug is loosely mounted on the outer end of said lug, so that it may always wedge between the two contact-points of the night-bell circuit and not rest upon one alone, as it might do if rigidly fixed to said lug-and the adjustment of the latter was not perfect with relation to said contact-points.

C is the face-plate of the j ack and drop, and it has the opening C' for the reception of the plug. On the rear side of said face-plate C is a metallic base portion G2, extending to the rear extremity of the jack. This base portion contains the pivoted restoring-arm C3, the upturned end C4 of which is adapted to engage the lug B3, rigidly secured to the shaft B, and by its upward movement to oscillate the shaft B and restore the annunciator-plate to its normal position. The restoring-arm C3 is so formed that it will be engaged rearward of its pivot by the inserted plug. C5 is a loop for the attachment of one end'of thefprimary wire of the magnetic coil A. C6 is a baseblock of non-conducting material, having the verticai slot G7 at its rear end. It is held rigidly in position by a screw passing through the lower part of the supporting-frame A6 and another screw extending-upward from the metallic base portion C2. On one of its sides it has the contact-plate C8 in electrical connection with one end of the primary winding of the electromagnet, and overlying said contact-plate and secured at' the rear end of the non-conducting base-block C's is the contact-spring C9, adapted to have contact with the forward end of the inserted plug and also with the contactplate C8. When the plug is inserted into the opening C,the contact-spring C9 is raised from the contact-plate C8. A contactfplate C40 is secured to the rear end of the non-conducting block C6 on the upper side thereof and has the upturned lip G11. A stud O42 extends vertically thro ugh the base-block CG at a point adjacent to the upturned lip C14, and it is beveled on the side toward said upturned lip in order to form with said lip an inclined opening for the reception of the plug B4 on the lug B8, the upturned lip G11 and the plug B4 constituting the ends of the nightbell circuit to be closed when the space between them is bridged by the insertion of said plug B4. The stud C12 extends downward a little distance below the base-block C6 in order to engage a spring forming a portion of the night-bell circuit, mounted upon a portion of the switchboard to be next described.

D is one of the transverse bars of aswitchboard. It has the contact-points D', which are terminals of a subscribers line, and the contact-spring D2 and the contact-plate D3, both portions of the nightbell circuit. The transverse bar D is vertically perforated and is provided with a screw-bolt D4, the upper end of which bolt is adapted to extend through the slot C7 in the rear end of the base-block O6 and mechanically and electrically connect the jack and drop with the switchboard.

E is a plug of the usual description.

In operation the jack and drop are attached to the transverse bar ot the switchboard by means of the screw-bolt D4. This places the electromaguet on the subscribers line, the electrical connections being one of the contact-points D on the transverse bar D of the switchboard, the contact-spring C9, the contact plate O8, the primary winding of the electromagnet, the connecting-loop C5, the metallic" frame A6, and the other contactpoint D' of the subscribers circuit. When a call isJ made by a subscriber, the electric current passing over the line just specified energizes the electromagn et, and its armature A9 is attracted toward the core A and the shell A3, raising the latch-bar AT from engagement with the detent-finger B2 and permitting the annunciator-plate to fall. The

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plug B4 falls into electric contact with the stud C12 and the lip C11, completing the nightbell circuit. When the plug is inserted in the opening C', its forward end engages the restoring-arm C3, causing the forward end of the latter to raise the detent-finger B2 into an elevated position, where it is retained by the latch-bar A7. The insertion of the plug also mechanically moves the free end of the contact-sprin g Cgaway from the contact-plate C8, electrically removing the electromagnet from the subscribers line and placing the lines of the plugin electrical connection with said subscribers line in order to lpermit the loperator first to listen over said line to ascertain the subscribers desires and afterward to connect the calling subscriber with any other number on the board. The lines of force generated by the passage of a current through the coil follow almost entirely the path provided for them by the tubular shell VA8 and the core A of theelectromagnet, thus not only producing a very efficient electromagnet, but also preventing any of the lines of force from extending beyond the limits of the shell. An electromagnet provided for use with the tubular shell is Wound to a resistance of from five hundred to fifteen hundred ohms.

I claim as my inventionl. In a jack and drop for telephone-switchboards, in combination, a jack adapted for the reception of a plug; an electromagnet; an annunciator-plate arranged to fall in a substantially vertical plane; a shaft supporting the plate at one of its ends; a finger carried at the other end of said shaft; and a pivoted restoring-arm arranged to be engaged by said plug cooperating with said finger to restore said annunciator-plate.

2. In a jack and drop for telephone-switchboards, in combination, a jack adapted for the reception of a plug; an electromagnet; a tubular shell surrounding said electromagnet; an annunciator-plate arranged to fallin a substantially vertical plane; a shaft supporting said ann unciator-plate at one end of said shaft;a finger carried at the other end of said shaft; and a pivoted restoring-arm arranged to be engaged by said plug, coperating with said arm to restore said annunciator-plate.

3. In a jack and drop for telephone-switchboards, in combination, a jack adapted for the reception of a plug; an electromagnet; a tubular shell surrounding said electromagnet, which shell is closed at one end and is lattached to the core of said magnet; an annunciator-plate arranged to fall in a substantially vertical plane; a shaft supporting the plate at one end of said shaft; a finger carried atthe other end of said shaft; and a pivoted restoring-arm arranged to be engaged by said plug, cooperating with said linger to restore said annunciator-plate.

4. In a jack and drop for telephone-switchboards, in combination, a jack adapted for the reception of a plug; a restoring-arm arranged to be engaged by said plug; an electroinagnet; an armature for said magnet; an annunciator-plate adapted to fallin a substantially vertical plane; an oscillatory shaft for supporting the plate; and a detent-finger fixed on said shaft, for holding the annunciatorplate elevated.

5. In a jack and drop for telephone-switchboards, in combination, a jack adapted for the reception of a plug; a pivoted restoringarm arranged to be engaged by said plug; a magnet; an armature; an annunciator-plate adapted to fall in a substantially vertical plane; an oscillatory shaft for supporting the plate; and a detenta-finger fixed on said shaft, and a latch for engaging said finger and preventing the oscillation thereof.

6. In a jack and drop for telephoneswitch boards, in combination, a jack adapted for the reception of a plug; a pivoted restoringarm arranged to be engaged by said plug; an electromagnet; an armature for the magnet; an annunciator-plate; an oscillatory7 shaft for supporting said annunciator-plate, which 4shaft extends parallel with the core of the magnet; a detent-nger fixed lon said shaft; an open night-bell circuit; and means for closing the night-bell circuit when the annunciator-plate falls.

7. In a jack and drop for telephone-switchboards, in combination, a jack adapted for the reception of a plug; a pivoted restoringarm arranged to be engaged by said plug; an open night-bell circuit; an electromagnet; a tilting latch-bar; an annunciator-plate; an oscillatory shaft for supporting said an nunciator-plate; a detent-Iinger fixed on said shaft; an open night-bell circuit; and means on said shaft, adapted to close the night-bell circuit when the annunciator-plate falls.

8. In a jack and drop for telephone-switchboards, in combination, a base-block having a slot at its rear end; asupporting-frame; an electromagnet; an armature; a detent-inger; a shaft; an annunciator-plate fixed at a point below its center of gravity to said shaft; a

contact-point and a contact-spring connected to the ends of a subscribers telephoneline; and means for forming an electrical connection between said contact-point and the magnet.

9. In an annunciator-drop, in combination, a drop-plate arranged to fall sidewise in a substantially vertical plane; an electromagnet for controlling said drop-plate; a shaft for supporting said drop-plate; a detent-inger on said shaft; a latch-bar adapted to engage said detent-linger; and means for withdrawing said latch-bar from the path 0f the detent-iinger.

10. In an annunciator-drop, in combination, a drop-plate arranged to fall sidewise in a substantially verti cal plane; a shaft for supporting said drop-plate; a detent-nger also on said shaft; a latch-bar adapted to engage said detent-finger; an electromagnet; and an IOO IIO

armature for said magnet, for withdrawing said latch-bar from engagement with said detent-finger.

11. In an annunciator-drop, in combination, a drop-plate arranged to fall sidewise in a substantially verticalV plane; a shaft for said drop-plate; a detent-inger on said shaft; a latch-bar adapted to engage said detent-inger; an electromagnet; an armature for the magnet, for withdrawing said latch-barfrom the path of said detent-inger; and a tubular shell adapted to surround said magnet and confine the magnetic lines of force of said magnet.

l2. In an annunciator-drop, in combination, an oscillating shaft; a drop-plate fixed at a point below its center of gravity to said shaft; a detent-nger fixed directly to said shaft, for preventing said drop-plate from falling; a latch-bar adapted to engage said detent-iinger; and an electromagnet for withdrawing said latch-bar from the path of said detent-nger.

13. In an annunciator-drop, in combination, a shaft capable of an oscillatory movement; a drop-plate arranged to fall in a substantially vertical plane, fixed on said shaft;

a detent-nger also fixed on the shaft; a magnet; an armature; and an arm on said armature adapted to engage said detent-iinger.

14. In an annunciator-drop, in combina- I tion, a shaft capable oi' an oscillatory movement; a drop-plate arranged to fall in a substantially vertical plane, fixed at one end of said shaft, and capable of being supported in unstable equilibrium; a magnet; an armature; an arm on said armature; and a detentnger adapted to engage said arm.

15. In a telephone-switchboard, in combination, a supportingrail having contactpoints for the connection of the subscribers line-Wires, also having contact-points for the night-bell circuit; a series of jacks and drops;

a base-block for each of said jacks and drops,

each of which base-blocks is provided with a slot for the reception of a securing means, also with contact-points corresponding to the said contact-points on said supporting-rail; a stud extending through said base-block for engaging one line of the night-bell circuit; a plate adjacent to said stud; and a bolt for securing'each of said jacks and drops to said supporting-rail, which bolt also makes electrical connection between one of the lines of the night-bell circuit and said plate.

16. In a telephone-switchboard, in combination, a series of combined jacks and drops; contact-points xed on the switchboard for the connection of a subscribers line-Wires, also contacts for the night-bell circuit; a baseblock for each of said combined jacks and drops, each of which base-blocks is provided with a slot for the reception of a securing means, also with contacts corresponding to those for the attachment of the subscribers line-Wires, also having a stud for electrically engaging one line of the night-bell circuit, and a contact-plate having an upturned end, and an opening in the body of the plate; and a securing-bolt passing through a portion of the switchboard and the slot in said baseblock, and making contact between said plate having the upturned end and one of the lines of the night-bell circuit.

17. In a telephone-switchboard, in combination, a series of combined jacks and drops; contact-points fixed on the switchboard for the connection of a subscribers line-Wires; a night-bell circuit, one line of which is provided With a projecting contact-spring; a base-block for each of said combined jacks and drops, each of which base-blocks is provided with an opening for a securing means, also having contacts corresponding to those for the attachment of the subscribers linewires, also having a stud for engaging the said contact-spring of the night-bell circuit, and having a contactplate with an upturned end; and a bolt for securing the combined jack and drop to the switchboard, which bolt also forms an electrical connection between one line of the night-bell circuit and the plate having an upturned end.

18. In a telephone-switchboard, in combination, a series of combined jacks and drops;

contact-points fixed on the switchboard for the connection of a subscriber-s line-wires; a night-bell circuit, one line of which is provided with a projecting contact.- spring; a base-block for each of said combined jacks and drops, each of which base blocks is provided with a slot for a securing means, also having contacts corresponding to those for the attachment of the subscribers linewires, also having a stud for engaging the Said contact-spring of the night-bell circuit, and having a contact-plate with an upturned end adjacent to the said stud; means for securing the combined jack and drop to the switchboard, which means also forms an electrical connection betweenone line of the nightbell circuit and the plate having the upturned end; and a plug for making contact between the last-named plate and the said stud when the annunciator-plate falls.

ISIDOR J. KUSEL.

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