US554399A - Charles e - Google Patents

Description

(No Model.)

0. E. SORIBNER. APPARATUS FOR TELEPHONE SWITGHBOARDS.

No. 554,399. Patented Feb. 11, 1896.

lTzlyEjSsES LNVENTOR,

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UNITED STATES LATENT OFFICE.

CHARLES E. SCRIBNER, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE WESTERN ELECTRIC COMPANY, OF SAME PLACE.

APPARATU 8 FOR TELEPHON E-SWITCH BOARDS.

SPECIFICATION forming part of Letters Patent No. 554,399, dated February 11, 1896. Application filed July 2,1895. Serial No. 554,701. (No model.)

To all whom, it may concern: it, and at the same time to obtain its advan- Be it known that 1, CHARLES E. SCRIBNER, tages to acertain extent in all connections. a citizen of the United States, residing at Chi- The invention consists in providing for cago, in the county of Cook and State of Illieach line upon that section of the switch- 55 nois, have invented a certain new and useful board which contains the line-annunciator a Improvement in Apparatus for Telephonespecial spring-jack having such separable Switchboards, (Case N o. 392,) of Which the switch-contacts, these switch-contacts being following is a full, clear, concise, and exact included in thetelephone-line at the begin description, reference being had to the acning of the system, so that when separated 6o 10 companying drawing, forming a part of this they disconnect the main line from the appaspecification. ratus in the remainder of the switchboard. My invention concerns the circuits and the This spring-jack may preferably be the anarrangement of spring-jacks of telephoneswering-jack in the switchboard-that is, a lines in multiple switchboards of the branch spring-jack distinct from the line spring- I 5 terminal type, being a device for dissociating jacks in the same section of the switchboard from the line its shunting-annunciator or sigand located at some easily-accessible point nal-indicator, together with the cable through after the manner of Patent No. 330,067, dated this instrument, and for permitting complete November 10, 1885, to J A. Seely. Hence or thorough connections between different when connection is made with any line at the 20 lines to be made under certain circumstances answering-jack, in response to an initial sigwithout leaving any unnecessary instruments nal from the subscriber, the line-annunciator or cables appended to the lines. of that line, together with thecables extend- In multiple telephone-switchboards of the ing through allother sections of the switchtype mentioned the spring-jacks 011 the differboard, is disconnected from the outgoing line. 7 5 25 cut sections of switchboards are connected in Usually the connection will be completed at multiple with the line, while the signalingthe same section of switchboard with a line instrument or line-annunciator is placed in a jack of another line, so that the cables and permanent bridge of the line-circuit. The annunciator of the latter line will still remain annunciator is constructed to have high reconnected with it and will become useless apo sistance and impedance to prevent, as far as pendages to the completed circuit; but a conpossible, the shunting of telephonic current siderable advantage is attained by thus disthrough it. On account of the imperfection connecting from even one of the lines the unwith which this function was exercised in necessary cabling and apparatus. I cases where very long or high resistance-cir- Each section of switchboard is furnished 8 5 3 5 cuits were coupled together it has been cuswith trunk-lines or transfer-circuits extend tomary to provide at the beginning of the ing to each other section, by means of which,

' switchboard. system a separate section of when desired, a connection made with an switchboard with springjacks having sepaanswering-jack of a line at one section of the rable switch-contacts, which, when the plug switchboard, may be trunked to the 40 was inserted into the jack, disconnected from switchboard whereon is located the answerthe outgoing line-circuit the cables of the reing-jack of the line with which the connecmainder of the switchboard, including the tion is to be completed, and may be made bridged line-annunciator, and connected with with that answering-jack. Under these cirthe springjacks on the other sections of eumstances all cable and instruments will be 5 switchboard, all long-distance connections disconnected from both lines of the completed with lines being made at this section of the circnit,the result being then the exact equivswitchboard. alent of that obtained by the use of the It is the purpose of my present invention special switchboard-section before described. to perform the functions of this peculiar sec- Of course this last mode of connection, by mo 50 tion of switchboard, while avoiding the large trunking from an answeringjack on one number of special spring-jacks contained in section to another on a different section of the switchboard, would be made use of only in the case of long-distance connections, in which it might be necessary to leave the lines wholly free from attachments extraneous to the telephone-circuit.

My invention, then, comprises, first, a telephone-line extending through the switchcontacts of a special answering spring-jack upon some section of a multiple switchboard and thence to a branch terminal spring-jack upon each other section of the switchboard, being closed finally through a line-annunciator, and, second, transfer-circuits or trunklines from each section of switchboard to every other section, by which a through connection may be made from any answering spring-jack on one section to an answering spring-j ack on any other section of the switchboard.

WVhen connection is made at-a single section of the switchboard between an answerin g-jack of the line terminating at that switchboard and the line-jack of anothcrline in the same section, the cabling and the line-annunciator of the call-initiating line are cut oil. When a connection is made from an answer ing-jaok of, acall-initiating line through a trunk-line to another section of the switchboard, and there with the answering-jack of the correspondent line, all switchboard-cable and both line-annunciatorsare removed from the circuit.

I have shown the arrangement of circuits of my invention in the accompanying diagram. In this figure three sub-stations, A, B and G, are represented, furnished with the usual signaling and telephonic appliances. These stations are connected by lines, which are designated 1 2, 3 4 and 5 6, respectively, with the apparatus upon three sections, (Z, d and d of amultiple telephoneswitchboard at a central station. The two line conductors, l. 2, of line to station A, are connected with the contact-springs of an answering spring-jack 6 upon sect-ion d of the switchboard. This spring-jaek is of the type before mentioned-401ml; is, its switch-springs are separable from the contact-points upon which they normally rest, and are opened from them when a plug is insertedinto the spring jack. From the contact-anvils of the springjack ca pair of conductors 7 8 extend through the switchboard, being connected with the corresponding line-springs in line springjacks e, c and e in the diii'ercnt sections of the switchboard, and with the main coil of annunciator 6 which is located on the sectiond of the switchboard near the answeringjack .All the spring-jacks of the line have the usual test-rings, which are connected together through a wire 9 and form a portion of a local circuit which is closed when connection is made with the line, and which serves both to restore the line-annunciator which has been operated and to prevent its operation by subsequent signals in the line. The

arrangement of circuits for this purpose is well known in the art.

The line conductors, 3 4, likewise extend through the switch-contacts of an answeringjack f at section d of the switchboard, and thence to wires 1O 11, which lead to the contact-sprin gs of spring-jacks f f f and to the annunciator f on section d. The conductors of line to station 0 are connected with answering-jack 9, line spring-jacks g, g and g and with annunciator g.

The wires 7 8, 10 11 and 12 13 are, in practice, made up into a cable.

Each switchboard is provided with pairs of connecting-plugs h h, each having three contact-pieces adapted to register with the three contact parts of the spring-jack. The like line-contacts of the different members of each pair of plugs are connected together by conductors 1e 15, which constitute what is generally known as the plug-circuit. A clearing-out annunciator dis connected in a bridge of this circuit. Those contact-pieces of the plugs which register with the test-rings of the spring-jacks form the terminals of a conductor 16, which is grounded through a battery 70. This battery serves to produce a test and also. to reset the line-annunciators.

A trunk-line is provided extending from each section of the switchboard to each other section, and terminating at each position in a spring-jack. Thus, trunk-line or transfercircuit 17 18 extends between sections (1 and d of the switchboard, terminating in springjacks Z and Z at the different boards. Trunkline 19 20 extends between boards (1 and d and line 22 23 between boards. (1. and (1 For the purpose of tracing the opcrationof the system assume that subscriber at station 0 transmits an initial call-signal by rotating his signaling-generator. The annunciator g isoperated. and indicates the call to the opera tor at the section (1 of the switchboard. This operator then inserts her answering-plug 72 into the answering-jack g, learning the order from the subscriber by means of her telephone bridged across the plug-circuit in a well-known way. By the insertion of plug h into the answering-jack g the conductors 12 13 are disconnected from the line conductors 5 6, so that these line conductors are left tree from all appended cables and from the shunting-magnet of annunciator 9 If the operator, having learned the order, desires to make connection with the correspondent line at her own. section of the switchboard, she inserts plug it into the line-jack of that line-for example, into line-jack f if the call be for connection with station 15. This maybe done in case either or both of the lines are of low resistance and transmission between the stations is so good that the deleterious effect of the cable remaining attached to the line 3 4 and the shunting effect of the line-annunciator f? are inappreciable. It, however, the connection required were with the station A, which may be assumed to be so distant as to make telephonic communication with it difficult, the operator may proceed in a different manner.

Having received the order for connection with station A, she will insert plug 71, into the trunk-jack Z, which forms the terminal of the transfer or trunk circuit 17 18 to section d of the switchboard. She will then, by any suitable order wire or othercontrivance, such as are well known in the art, instruct the operator at section cl to connect the trunk springjack Zwith the answering-jack c. When this connection has been made, it will be noted that a complete metallic circuit will have been formed from station to station A, be ing by way of line conductors 6, plug-circuit 14 15 at board d transfer-circuit 17 18, plug-circuit 14 15 at board d, and line-circuit 1 2 to station A. The normal line connections of both lines, including the cable in the switchboard, the unused spring-jacks and the line-ann unciators will be cut off from this through circuit at the answering-jacks g and 6, respectively. The greatest possible efficiency of transmission through the switchboard will be thus attained.

I have not considered it necessary to show in detail the mechanism of the plug-circuit, or the signaling appliances for facilitating the transfer of connections by means of the office trunk-lines. Various modes of performing all that is here required are well known in the art.

I claim as new- 1. The combination with a telephone-line, of a line spring-jack upon each of several sections of a multiple switchboard, and an answering spring-jack at one of the sections having contacts adapted to be separated when a plug is inserted into the spring-jack and arranged to cut off the conductor extending to the line spring-jacks, as described.

2. The combination with a telephone-line, of a line spring-jack upon each of several multiple switchboards and an annunciator in a bridge of the circuit, and an answering-jack having separable contacts included in the line-circuit between the sub-station and the line-jacks and annunciator, as described,

3. In combination,two telephone-lines,each extending normally through separable contacts in an answering-jack, and thence to line spring-jacks upon different sections of a multiple switchboard, connecting-plugs inserted in the different spring-jacks, and a loop-conductor completing the circuit between the plugs, as described.

4. In combination,two telephone-lines, each extending normally through separable contacts in an answering spring-jack upon a section of a multiple switchboard, and thence to a signal-indicator in the same section and to line spring-jacks on the different sections of the switchboard, a transfer-line extending between the switchboards whereon the answering-jacks are located, and means for connecting each answering-jack with the trunkline, whereby the telephone-lines may be united in a through circuit devoid of appended line-jacks and signaling instruments, as described.

In witness whereof I hereunto subscribe my name this 13th day of June, A. D. 1895.

CHARLES E. SORIBNER.

Witnesses;

ELLA EDLER, MYRTA F. GREEN.

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