US1257303A - Repeater system. - Google Patents

Description

J. H. BELL.

REPEATER SYSTEM.

APPLICATION FILED M16. 1916.

Patented Feb. 26, 1918..

nnrrnn sTATns rn'rnrvr canton.

J OHN H. BELL, OF EAST ORANGE, NEW JERSEY, AS$IGNUE TO illl'hEVJI'ICPRN' ELECTRIG COM- PANY, INCORPORATED, 01'' NEW YORK, N. Y., A COR-PQLRATIOH OF NEW YGRK.

REPEA'I'ER SYSTEM.

Specification of Letters Patent.

Patented Feb. 26, 1918.

Application filed May 16, 1916. Serial No. 97,763.

To all whom it may concern:

Be it known that 1, JOHN H. BELL, a subject of the King of Great Britain, residing at East Urauge, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Repeater Systems, of which the following is a full, clear, concise, and exact description.

This invention relates to telegraph systems and more particularly to improvements in so-called repeater systems whereby, in as sociation with two or more independent line circuit sections or signaling circuits, current action first taking place in one circuit section is automatically relayed into the other circuit sections, such repeating operations being reciprocal with respect to a plurality of line sections. The repeater system Which comprises this invention is adapted for use with telegraphic codes or arrangements wherein the signal units or current impulses are separated by no-current intervals.

The principal object of this invention is to simplify the arrangementof repeater circuits for a system of the above character, in order to permit the employment of devices of least complication of parts and to pro vide that each line section forming one of a dual or multiple circuit group may be identically equipped with respect to each other as regards repeating devices, and to avoid the necessity of employing apparatus locally common to a group of repeating devices. The last mentioned feature permits of greater flexibility in the interconnecting and grouping of circuit or sections for rendering service of this character, owing to the fact that the repeating equipment of one line section is typical'of the equipment of each one of the other line sections associated therewith.

In accordance with this invention, each signaling or main line section making up the telegraphic line or system is provided with two polarized relays and one alternating or universal current relay, each directly responsive to the currents which traverse the associated main line circuit .section. The switching contacts of the universal current relay of one line section are arranged to control the operating circuits of the repeating relays common to the other line sections comprising a repeating group. Accordingly, when originating or controlling current impulses, separated by no-current intervals, are

other line sections are disabled, While the repeating relays of the primarily active sectlon operate to include a suitable source of current at the repeating point to set up current changes and no-current intervals in the other sections, corresponding in character to the changes set up in the first section. This system is adapted to relay so called single current or double current signaling combinations, and may be employed for either operating printing telegraphs or for manual telegraph working.

In the accompanying drawing, Figure 1 illustrates diagrammatically a. repeater equipment in accordance with this invention, whereby the reciprocal .relaying of signals may be effected from one to the other of two main line sections, and Fig. 2 similarly illustrates a multiple repeater equipment suitable for reciprocally relaying signals from one section to the other section of a multiple line group formed of three line sections.

The features of this invention may be readily understood from a description of the operation of the system. Referring first to Fig. 1, let it be assumed that the ends (not shown) of the main line conductors 1 and 2 terminate in ditferent stations and that each terminal is equipped with apparatus suitable for sending or receiving messages of this character.

In accordance with well-known telegraphic practice, telegraph printing systems may be operated by signaling impulses formed of intermittent applications of current of the same polarity, also by current impulses of changing polarity, all of which may be applied to a main line section by the transmitter at a sending station thereon. Such characteristic current impulses, in turn, being translated into a printed message at a receiving station, all in a manner well-known in the art. Assuming now that such impulses supplied from suitable sources of grounded battery are present in the line circuit 1 at a distant station (not shown), it will be apparent these currents may complete circuit through the contacts 15 of a polarized relay 13, the coeperating contacts and armature of an alternating current relay 12, the winding of a second alternating current relay 5, the winding of a polarized relay 6, thence through the winding of a second polarized relay 7 to the earth connection. The relay 5 is responsive to each character of current action through the circuit traced and, being adapted to respond quickly when energized and to release slowly when de'nergized, it remains operated under the usual cessations of current present at certain instants in the spacing or changing of polarity with respect to the transmitted impulses; therefore, during the time a message is being transmitted over the line 1, the contacts of this relay remain separated, thereb disconnecting the into the line circuit 1 are the same as those already described, except that the operations take place through similar action of other relays. In tracing such a message, currents repeating group, comprlsing relays 12, 13 from the line 2 complete circuit through the and 14. Although the relay 5 continues encontacts 8 of the polarized relayfi, the conergized by the transmitted impulses, the tact and armature of the relay 5, the windsame current through the polarized relays 6 ingof the alternating current relay 12, and 7 act selectively therein to suitably thence to earth through the serially-contranslate each impulse of current. The ponected windings of the polarized relays '13 .larized relays are biased to render their reand 14. During the time current action is spective normal contacts 8 and 10 closed in present in the line circuit 2, the relay 12 unison with each cessation of current in the line 1 such as takes place in the spacing of impulses or between reversals in current direction. Accordingly, in response to intermittent impulses of positive current, the relay 6 will be operated to set up corresponding separations and closures, respectively, of its contacts 8 and 9 during which time -no operating effect is, however, produced in the other polarized relay 7, except to incidentally add some increase of pressure to the normal biasing'force acting to close its .contacts 10. Therefore, the rela 7 remains inert under positive impulses 0 current, while the relay 6 responds thereto in phase with such impulses.

The relayed currents may be traced by assuming that, under the influence of a posltive impulse of current oyer the main line section 1, the relay 7 remains inert while the relay 6 is operated, thereby causing the separation of its contacts 8 and the closing of its contacts 9 whereby the positive pole of a grounded battery 19 is connected to the line conductor 2, and accordingly energizes this line in unison with the originating impulses in the line 1. Now, if immedlately following the positive impulse or impulses,

- an impulse of negative current is received from the main line conductor- 1, the relay 6 is restored and remains inert, while the negatively poled relay 7 is operated to separate its contacts 10 and close its contacts 11, thereby connecting an oppositely poled grounded battery 20 to send a corresponding negative impulse of current out over the hne conductor 2.

The arrangement whereby the contacts 8 of the relay 6 are connected in parallel with the contacts 10 of the relay 7, and the corresponding relation of the contacts 17 of the relay 14 with respect to'the contacts 15 of the relay 13, while not an essential feature of this system, is employed only for the reason that in practice it is expedient that these relays be of uniform type, therecontinues energized, thereby separating its contacts to disconnect the repeating .group comprising relays ,5, 6 and 7. The polarized relays 13 and 14 now selectively respond to the impulses present in the line circuit 2, in

the same manner as hereinbefore described for the corresponding operations of the relays 6 and 7. The closing of the contacts 16 of the relay 13, in response to a positive impulse, connects the positive side of the grounded battery 19 to the line conductor 1, Accordingly, under an impulse of ne ative current the line circuit 2, the re ay 13 restores and remains inert, while the relay 14 is operated to close its contacts 18, thereb including the negative side ofthe 'groun ed battery 20 with the line conductor 1.

From the. foregoing description, it will be readily understood that, during the time messages are being transmitted from the line circuit 1, the roup of relays designated as B are disable while the relays comprising the group A are active to repeat the message into the line 2, and conversely, when a message is transmitted from the line circuit 2, the repeating group A is disabled, while the group 2 is actlve to repeat the message into shown) on this line. The path of these currents may be traced through the cooperating contact 50 and armature of a universal cur rent relay 47, the contact 38 and armature of a universal current relay 37, a conductor 32, the winding of a polarized relay 25, the winding of a second polarized relay 26, a conductor 33, thence to earth through the Winding of an alternating or universal cur rent relay 27. The relay 27 is energized by these currents to continuously separate its contacts 28 and 30, and to close its contacts 29 and 31 during the passage of signal surrent impulses. The various circuit changes set up by the operation of the relay 27 are first, the separation of its contacts 28 disconnects the repeating group D comprising relays 35, 36 and 37, all corresponding with the line 22; second, the separation of its contacts 30 disconnects the repeating group E comprising relays 45, 46 and 47, all corresponding with the line 23; third, the closing of the contacts 29 connects the line circuit 22 to the common or bus conductor 34 of the relays 25 and 26; and fourth, the closing of the contacts 31 connects the line circuit 23 also to the bus conductor 34, thereby establishing a physical connection between the line circuits 22 and 23. Now, at the instant a positive impulse of current is received over the line circuit 21, the polarized relay 25 remains inert, while the associated polarized relay 26 is operated to close its contacts, thereby including the positive pole of the grounded battery 19 with the bus conductor 34, thence this current branches into the main line circuits 22 and 23. The path of the repeated impulse for the line 22 may be traced from the bus conductor 34 over the contacts 29 of the relay 27 a conductor 42, and the contacts 48 of the relay 47, while the corresponding impulse of current from the bus conductor 34 reaches the line 23 over the contacts 31 of the relay 27. At the instant an initial impulse of negative current is transmitted over the line circuit 21, the polarized relay 26 is restored to remain inert, while the polarized relay 25 is operated to close its contacts, thereby including the negative pole of the grounded battery 20 with the bus conductor 34, from which point this repeated current reaches the main line circuits 22 and 23 over the respective paths already traced for the positive im-- pulse of current from the battery 19.

The foregoing description of the operations taking lace when a message is repeated from t e line 21 to the lines 22 and 23 is typical of the action takin place when a message is repeatedfrom eit er one of the latter line circuits to the other two lines. from the line 22 to the lines 21 and 23, the repeating group D is active, while the re peating groups C and E are respectively disconnected by the separation of the contacts 38 and 40 of the alternating current relay 37. The current impulses set up in the line circuit 22 may be traced therefrom by way of the contacts 48 of the relay 47, a conductor 42, the contacts 28 of the relay 27, a conductor 52, the serially connected windings of 'the polarized relays 35 and 36, a

Accordingly in repeating signal conductor 44, thence through the Winding of the alternating current relay 37 to the earth connection. In response to this cur rent action in the line 22, the polar relays 35 i and 36 selectively connect the associated batteries by way of the bus conductor 54 to the line circuit 21 over the contacts 39 of the relay 37, and the contacts 50 of the relay 47, and to the line circuit 23 by way of the contacts 41 of the relay 37 and the contacts 30 of the relay 27.

Messages originating in the line circuit 23 in a similar manner operate the repeating group E, comprising relays 45, 46 and 47, to first disable the repeating groups C and D and, secondly, to cause the polarized relay 45 and 46 to connect the associated batterles to set up repeated impulses of current in the llnes 21 and 22, all by way of contacts and conductors corresponding with those already traced.

From the foregoing description, it will be apparent that with the present system, the repeating equlpment of one line circuit is typical and a counterpart of the equi ment of each one of the other line circuits associated therewith to form a repeating roup.

Although several batteries have, for convenlence, been shown in the drawing, it will be understood that each set of correspondngly poled batteries may be, and preferably 1s, one and the same battery.

What is claimed is:

1 In a telegraph repeating system, a plurahty of telegra h line circuits, sources of current, a plura ity of line relays for each line circuit for repeating telegraphic signals from any one of said line circuits into the other ones of said line circuits, and contacts on said relays efl'ective in said repeatmg operations to translate telegraphic intervals corresponding with predetermined periods of no current.

2. In a telegraph repeating system, a plurality of current sources, a plurality of telegraph line circuits, a universal current line relay and a first and second polarized line.

relay for each one of said line circuits, contacts operated by the universal current relay of any line circuit for disabling the line relays of the other line circuits and for joining the other line circuits one with another, and contacts operated by the polarized relays of any line circuit for repeating telegraphic signals corresponding with predetermined periods of positive current, of negative current and cessation of current into the other ones of said line circuits.

3. In a telegraph repeating system, a plurality of telegraph line circuits, a repeating device normally connected to each line circuit, and adapted to receive signals over the line to which it is connected, a source of current, means controlled by each repeating device for disconnecting another repeatingdevice from its line and for intermittently connecting the source of current to the other line circuits in response to the si als received 'over the line circuit to which it is connected.

4.- In a telegraph repeating system, a plurality of telegraph line circuits, a repeating device normally connected to each line circuit comprisin a plurality of relays, adapted to receive signals over the line to which they are connected, a source of current, means controlled by each repeating device for disconnecting another repeating device from its line and for intermittently connecting the source of current to the other line circuits in response to the signals received over the circuit to which it is connected.

cuit, comprising a plurality of polarized relays and a universal current relay, said relays being adapted to receive signals from the ine circuit to which they are connected, a source of current, means controlled by the universal current relay for disconnecting another repeating device from its line throughout the receipt of a series of signals over the line to which it is connected, and means controlled by the polarized relays for intermittently connecting the source of current to the other line circuits in response to said signals. In witness whereof, I hereunto subscribe my name this 12th day of May A. D. 1916.

JOHN. ii. BELL.

Images