US1325347A - Telephone system - Google Patents

Description

W. T. BOOTH.

TELEPHONE SYSTEM.

APPLICATION FILED JULY 9,1911.

Patented Dec. 16,1919.

/n ven for: Vl f/fiam 7. 500772. y

, UNITED STATES PATENT OFFICE.

WILLIAM T. BOOTH, OF EAST ORANGE, NEW JERSEY, ASSIGNOR TO WESTERN ELECTRIC COMPANY, INCGEPORATED, OF NEW' YORK, N. Y., A CORPORATION OF NEW YORK.

TELEPEEGN E SYSTEM.

Specification of Letters Patent.

Patented Dec. 16, 1919.

Application filed. July 9, 1917. Serial No. 179,473.

' East Orange, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Telephone Systems, of which the foll wing is a full, clear, concise, and exact description.

7 This invention relates totelephone sys tems, and the principal object of the invention is to pro-videa simple and efiicient arrangement of circuits and apparatus to effeet communication between the different stations of a t lephone system and to accomplish this, electromagnetic means are provided to control the connection of the telephone set of a callingstation with the line of a called station; the electromagnetic means serving to do away with the necessity of releasing any calling keys which might be depressed at the called station before said station could answer and also serving as an impedance coil through which talking current is supplied to the system.

This and other features of the invention may be readily understood by reference to the accompanying drawing wherein the in vention is shown as applied to an intercommunicating telephone system. Three stations are illustrated, each having lines extending to the other stations, although ohviously a greater number of stations may be similarly connected if desired.

In making the call, the calling party removes his recei er and depressesthe calling key of the desired station to its lowermost position. Si naling current is thereby supplied to operate the signal at the called station. Current from both the sig naling and talking batteries is also supplied. to the right-hand windin of a relay at the calling station which hereupon pulls up. The calling key is then allowed to return to its intermediate position, which removes the signaling battery from the circuit, and, the relay at the calling station being up, supplies talking current through its windings to the telephone set of the calling station; this relay thus serving as a retardation coil. The relay also cooperates with the depressed calling key to place talking battery on the lines individual to hecalled station, and the removal of the receiver at the called sta tion by the party ans e i g, br es the thereof across the lines individual thereto to place the parties in communication irrespective of whether any calling keys are in intermediate position at the called stae tion or not. On completion of conversation, the parties hang up, whereupon the relay at the calling station falls off without the calling key, however, being released from its intermediate position. On depressing another calling key in making a subsequent call, the first key is automatically released in the usual manner.

A somewhat more detailed-description of the operation will serve to more clearly explain the invention; and, for this purpose, assume that station A wishes to call station B. The receiver at A would be removed butwould have no effect other than to bridge the telephone set of station A across the lines 1 and 1 individual thereto; similar lines 2, 2 and 3, 3 being provided for stations B and C, respectively. The party at station A would then depress calling key K individual to station B. This key in common with the other calling keys K K and K is designed so that when depressed as far as it will go it will bring the fourth spring contact into engagement with the lowermost spring and also engage the center spring thereof with the fourth spring and also with a busbar l. The keys remain in the lowermost position only so long as they are manually held there by the personcalling and return to an intermediate position in which they are held by the usual locking plate 5, as soon as pressure on the calling button is relieved. In intermediate position only the first and second and third and fourth springs, respectively, of the keys are en gaged. The operation of any key in callingreleases any other key which may be locked in intermediate position, although it is not necessary that keys which may be locked in position at a called station be released to obtain connection with the calling line to prevent interference by other parties,

although this has been generally necessary heretofore in systems of this kind.

The lousbar 4 is connected by a conductor 6 to a lead wire 7 extending to one side of a signaling battery 8 common to the system;

posite poles of the different batteries being connected thereto. On full depression of the key K a circuit is completed to operate a signal 11 at station B; this circuit extending from battery 8, lead wire 7, busbar 4:,

. third spring of key K conductor 12, line wire 2, conductor 13, hookswitch let and lower contact thereof at station B, conductor 15, signal 11, conductor 16, and lead wire 9 to the other side of signaling battery 8. The signal 11 interrupts its own circuit and operates only so long as the key K is held in its fully depressed position.

Another circuit is also completed at this time to energize the right-hand winding of relay 17 at station A to pull up the armatures thereof; this circuit extending from lower side of battery 8, lead wire 7, conductor 6, busbar at, third, fourth and fifth springs of key K conductors 18, 19 and 20 right-hand winding of relay l7, conductor 21 and lead wire 9 to the other side of ringing battery 8. Relay 17 on pulling up serves to complete a holding circuit for itself; this circuit being the same as that just traced to the fourth spring of the key K from whence it extends by conductors 22, 23 and 24, right-hand armature and upper front contact of relay 17, through the right-hand winding thereof to conductor 21, and lead wire 9, to the positive side of battery 8. The attraction of the armatures of relay 17 also completes a circuit through both windings of this relay; this circuit extending from the negative side of talking battery 10, lead wire 9, conductor 21, right-hand winding of relay 17, upper inner contact and ri ht-hand armature to lower inner contact thereof, conductors 25 and 26, transmitter, receiver and upper contact of hookswitch of station A, conductor 27, lower inner contact and left-hand armature of relay 17, upper inner contact thereof, left-hand winding of relay 17 and conductor 28 to lead wire 29, and positive side of talking battery 10.

The holding circuit previously traced from ringing battery through the right-hand winding of the relay would practically neutralize the effect of current from the battery 10 through this winding, but the lefthand winding is actively energized at this time and serves to hold the armatures attracted.

The key K would now be released to intermediate position, whereupon the circuit from the signaling battery 8 through the right-hand winding of the relay 17 is opened at the busbar 41; leaving both windings, however, energized by talking battery 10. The relay windings under these conditions are interposed between talking battery and the telephone set of station A and serve as an impedance or retardation coil for current supplied thereto. Talking current is thus supplied to station A and the relay ,1? being energized, battery also placed on the line wires 2 and 2 of station B through the right-hand armature of relay 17 and fourth and third springs of key K and the lefthand armature of relay 17 and second and first springs of key K respectively, so that on the party at station B removing his receiver, a talking circuit is completed in parallel with station A. This parallel circuit begins at the upper front contact and lefthand armature of relay 17, and extends over conductors 30, 31 and 32, second and'first spring of key K at station A, conductor 33, line wire 2, conductors 31, 35, transmitter and receiver of station B, upper contactand hookswitch 1 1, conductor 13, line wire 2, e011- ductor 12, third and fourth springs of key K at station A, and conductors 22, 23 and 24 to right-hand armature and upper front contact of relay 17.

As previously stated, a calling key which has been depressed is not ordinarily released until another is operated so that although station B might be idle, when station A at tempted to secure a connection thereto, a calling key at station B would be in intermediate position. Assume that key K at station B was in this position and that a fourth station (not shown) was connected with station C. Under these conditions talking current would be present on the line wires 3, 3, and while it would pass the engaged springs of the key K at station B, it would not interfere with the conversation between stations A and B, as the circuit between these stations and the line 3, 3 is open at the armatures of the relay 38 at station B, sincethis relay is not operated when ation B is called. Interference by station C is thereby automatically prevented without necessitating the provision and manual opera-tion of a home button at the called station in answering to release any calling button which may be depressed thereat. The relay arrangement in the present case thus insures greater simplicity of operation than was possible with systems generally in use heretofore, which require the provision and manual operation of a home button to prevent interference between two or more pairs of connected stations.

The parties at stations A and B are thus free to converse in the usual manner and on termination of the conversation, both parties would hang up their receivers, whereupon the relay 17 at station A would be deenergized, restoring the system to normal w'thout, however releasing the key Y this fact, however, being immaterial as key K at station A can remain in intermediate position until another calling key is operated thereat without interfering with the opera-.

tion of the system as previously explained.

lVhat is claimed is: 1. In a telephone system, a plurality of pairs of individual conductors, a plurality of telephone-sets each permanently associated with a difierent pair of said conductors, a relay having a winding, selective switching means individual to one of said telephone sets to cooperate with said relay tov connect one of said telephone sets with another pair of said conductors, and a source of current for said system; the winding of said relay also serving as an impedance means for current supplied therethrough to the winding of said one of said relays also serving as an impedance means for current supplied therethrough to its respective tele phone set.

3. In a telephone system, a plurality of pairs of individual conductors, a plurality of telephone sets each permanently associated with a different pair of said conductors, a relay having a winding and individual "to each of said telephone sets, selective switching means individual to each of said tele phone sets to cooperate with one of said re lays to connect the telephone set of said relay with another pair of said conductors; the winding of said one of said relays also serving as an impedance means for current supplied therethrough to the telephone set associated with said other pair of conductors.

4. In a telephone system, a plurality of pairs of individual conductors, a plurality of telephone sets each permanently associated with a different pair of said conductors, a relay having a winding and individual to each of said telephone sets, selective switching means individual to each of said telephone sets to cooperate with one of said relays to connect the telephone set of said relay with another pair of said' conductors; the winding of said one of said relays also serving as an impedance means for current suppliedtherethrough to a plurality of connected telephone sets.

5. In a telephone system, a plurality of pairs of individual conductors, a plurality of telephone sets each permanently associated with a different pair of said conductors, a relay having a winding and individual to each of said telephone sets, selective switching means individual to each of said telephone sets to cooperate with one of said relays to connect the telephone set of said relay with another pair of said conductors;

the winding of said one of said relays also serving as an impedance means for current supplied therethrough to its telephone set and to the telephone setassociated with said other pair of conductors. V A

6. In a telephone system, a plurality of line circuits, a telephone set associated with each of said circuits, a relay individual to each of said circuits to connect the line circuit thereof to another of said circuits and having a plurality of windings, switching means associated with each of said telephone sets to coeperate with one of the relays indi-' vidual to line circuits which it is desired to associate together to connect such circuits, and a source of .current for said system; a winding of the relay cooperating with said switching means being interposed between each of the terminals of the source of current and the connected line circuits to serve. as an impedance means for current supplied to said connected line circuits.

7. In a telephone system, a plurality of line circuits, a telephone set associated withv each of said circuits, a relay individual to each of said circuitsto connect the line circuit thereof to another of said line circuits and having a plurality of windings, switching means associated with eachof said tele phone sets to cooperate with the relay thereof to connect the line circuit thereof to another of said line circuits, and a source of current for said system; a winding of said relay being interposed between each of the terminals of the source of current and the connected line circuits to serve as an impedance means for current supplied to the line circuits so connected. I V

8. In a telephone system, a plurality of line circuits, a telephone set associated with each of said circuits, a relay having a plu' 105 rality of windings, switching means individual to said telephone sets adapted. to co operate with said relay to connect two of said line circuits together, and a source of current for said system; a winding of said 110 relay being interposed between each of the terminals of the source of current and the line circuits of the system to serve as an im- V pedance means for current supplied to said line circuits.

9. In a telephone system, a plurality of line circuits, a telephone set associated with each of said circuits, a relay individual to each of said circuits. each relay hav ing a plurality of windings, switching 120 means individual to said telephone sets adapted to cooperate with said relays to connect two of said line circuits together. and a source of current for said'systemz one winding of said relays being interposed 125 between each of the terminals of the source of current and the line circuit to which the respective relay is individual to serve as an impedence means for current supplied to such-line circuit I a r 10. In a telephone system, a plurality of line circuits, a telephone set associated with each of said circuits, a relay individual to each of said circuits, each relay having a plurality of windings, switching means in dividual to said telephone sets to cooperate with said relays to connect two 01 said line circuits together, and a source of cur-- rent for said system; the operation of said with each of said circuits, a relay individual to each of said circuits, each relay havmg a plurality of windings, switching means associated with each of said telephone sets to cooperate with the relay individualto the line circuit thereof to connect such circuit to another of said line circuits, and a source of current normally dissociated from said line circuits and connected to the different line circuits by the operation of the relay individual to the particular line circuit; said relays each having a winding thereof interposed between each of the terminals of the source of current and the line circuit to which the respective relay is individual whereby said relays on operation serve as an impedance means for current supplied to the respective line circuit.

12. In a telephone system, a plurality of line circuits, a telephone set associated with each of said circuits, a relay having a plurality of windings, switching means cooperating with said relay to connect two of said line circuits together, and a source of current normally dissociated from said line circuits and connected thereto by the operation of said relay; a, winding of said relay being interposed between each of the terminals of the source of current and said line circuits, whereby said relay on operation serves as an impedance means for current supplied to said line circuits.

13. In a telephone system, a plurality of lin circuits, a telephone set associated with each of said circuits, relays individual to each of said line circuits, each relay having a. plurality of windings, switching means cooperating with said relays to connect two of said line circuits together, and a source of current normally dissociated from said line circuits and connected thereto by the operation of said relays; a winding of each of said relays being interposed between each of the terminals of the source or current and its respective lme c1rcu1t, whereby each.

of said relays on operation serves as an impedance means for current supplied to its respective line circuit.

14%. In a telephone system, a plurality of pairs of individual conductors, a plurality of telephone sets each permanently associated with a different pair of said conductors, a relay having a winding, selective switching means individual toone of said tele-,

phone sets to cooperate directly with said relay to connect one of said telephone sets with another pair of said conductors, and a source of current for said system; the winding of said relay also serving as an impedance means for current supplied therethrough to one of said connected telephone sets 15. In a telephone system, a plurality of pairs of individual conductors, a plurality of telephone sets each permanently associ ated with a different pair of said conductors, a relay having a winding and individual to each of said telephone 1 sets, selective switching means individual to each of said telephone sets to cooperate directly with one of said relays to connect the telephone set of said relay with another pair of said conductors; the winding of said one of said relays also serving as an impedance means for current supplied therethrough to its respective telephone set.

16. In a telephone system, a plurality of pairs of individual conductors, a plurality of telephone sets each permanently associated with a difierent pair of said conductors, a relay having a winding and individual to each of said telephone sets, selective switching means individual to each of said telephone sets to cotiperate directly with one of said relays to connect the telephone set of said relay with another pair of said conductors; the winding of said one of said relays also serving as an impedance means for current supplied therethrough to the telephone set associated with said other pair of conductors.

17. In a telephone system, a plurality of pairs of individual conductors, a plurality of telephone sets each permanently associated with a different pair of said conductors, a relay having a winding and individual to each of said telephone sets, selective switching means individual to each of said telephone sets to cooperate directly with one of said relays to connect the telephone set of said relay with another pair of said conduc tors; the winding of said one of said relays also serving as an impedance means for current supplied therethrough to a plurality of connected telephone sets.

18. In a telephone system, a plurality of pairs of individual conductors, a plurality of telephone sets each permanently associated with a different pair or" said conductors, a relay having a winding, and individual to each of said telephone sets, selective switching means individual to each of said telephone sets to cooperate directly with one of said relays to connect the telephone set of said relay with another pair of said conductors; the winding of said one of said relays also serving as an impedance means for current supplied therethrough to its telephone set and to the telephone set associated with said other pair of conductors.

19. In a telephone system, a plurality of line circuits, a telephone set associated with each of said circuits, a relay individual to each of said circuits to connect the line circuit thereof to another of said circuits and having a plurality of windings, switching means associated with each of said telephone sets to cooperatev directly with one of the relays individual to line circuits which it is desired to associate together to connect such circuits, and a source of current for said system; a winding of the relay cooperating with said switching means being interposed between each of the terminals of the source of current and the connected line circuits to serve as an impedance means for current supplied to said connected line circuits.

20. In a telephone system, a plurality of line circuits, a telephone set associated with each of said circuits, a relay having a plurality of windings, switching means individual to said telephone sets adapted to cooperate directly with said relay to connect two of said line circuits together, and a source of current for said system; a winding of said relay being interposed between each of the terminals of the source of current and the line circuits of the system to serve as an impedance means for current supplied to said line circuits.

21. In a telephone system, a plurality of line circuits, a plurality of telephone sets, a relay having a winding individual to each set to connect its associated set with one of the line circuits, a source of current normally connected to one of the telephone sets when such set is in use through a winding of its respective relay, a second source of current, and means cooperating with the second source of current for operating such relay to connect its respective set with one of the line circuits.

In witness whereof I hereunto subscribe my name this 5th day of July, A. D. 1917.

WILLIAM T. BOOTH. I

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