US1472460A - Telephone system - Google Patents

Description

H. P. CLAUSEN ET AL TELEPHONE SYSTEM Filed Dec. 28 1918 hie/7 ryf? G/flM en Char/ea L. Gwarum Patented 9st. 30, 1923., I

HENRY r. CLAUSEN, or Mo NT vEa oN, AND onAnrl'Es GOODRUM, on EW YORK, N. Y., AssIeNoRs- TO WESTERN ELECTRIC COMPANY, INCORPORATED,- or NEW YORK, N. Y., A ooRPoRArIoNor NEW YORK.

TELEPHONE sYsTnM.

Application filed December 28, 1918., Serial No. 268,664.

To all whom it may concern:

Be it known that we, HENRY P. CLAUSEN and Crrannns L. GooDRuM, citizens of the United States, residing at Mount Vernon in the county of Westchester and State of New York, and at New York, in the county of New York and State of New York, respectively, have invented certain new and useful Improvements in Telephone Systems, of which the following is a full, clear, concise, and exact description.

This invention relates to improvements in telephone exchange systems and has particular reference to a circuit arrangement for controlling automatic switches over long distant trunks.

In patent to H. P. Clausen and C. I1. Groodrum, No. 1,396,730,-dated November 15, 1921, means are provided at one station for controlling the operation of an automatic switch at a distant station over a controlling circuit common to a plurality of telephone circuits whereby a connection may be established between a calling and a called line over one of said telephone circuits. In this arrangement, automatic switches are operated only from one end of the controlling circuit by a mechanism associated with an operators position at the other end of said circuit.

An object of the present invention is to provide a novel arrangement which permits of automatic switches at'each end of a common controlling circuit to beoperated'by impulses simultaneously transmitted from opposite ends of said circuit.

The inventive idea involved is capable of receiving a variety of expressions, one of which, for the purpose of illustrating the invention, is shown in the accompanying drawing; but it is to be expressly understood that said drawing is employed merely for the purpose of facilitating the description of the invention as a whole, and not to define the limits thereof, reference being had to the appended claims for'this purpose.

The drawing illustrates diagrammatically the circuit arrangement embodying the present invention. r

In the present embodiment; ofthe invention use is preferably made of distributors operating in synchronism and controlled by a duplex sys'tem,-such as used in printing telegraphy, to transmit impulses from either end of a common controlling circuit to the other end thereof for operating automatic switches which connecta calling subscriber with a called subscriber over one of'a plurality of telephone circuits to which said controlling circuit is common;

In the drawing, 1 and 2 indicate two of a group of telephone circuits. employed to complete a connection from station A to station B, while 3 and 4 indicate telephone circuits ofa group which maybe utilized to complete a connection from station B to stat onA. A controlling circuit orconduci tor 5 common to both groups of telephone circuits, is provided over which impulses maybe transmitted in both directions to operate automatic switches (not shown) connected to the ends of said controlling circuit, Associated with the groups of telephone circuits, including trunks1 and 2, are distributors 6 and 7 rendered effective to cause the transmission of impulses over the conductor 5 from station A towards station B. Likewise, distributors 8 and.9 are associated with the group of telephone circuits including trunks?) and 4: and operate to transmitvimpulses over conductor 5 from station B whereby switches (not shown) at station Aniay be set. The two sets of distributors arepreferably of a type employed in printing telegraphy and are operated in synchronism in any well known manner. An operators position at station A is provided with a mechanism conventionally shown at 10, which is operated in accordance with the impulses to be transmitted and. which determines V the number of sentby the distributors 6 and 7 IA similar mechanism (not shown) may be provided at station B for controlling the transmission of impulses over conductor 5 from distributor 9 to distributor 8. The

mechanism 10 is preferably of 'a construc-- tion such as ,disclosediin the above-men- 9o lmpulses tioned patent wherein controlling devices are set in accordance with the number of impulses to be sentand released by a means, including a key, under the control of the ends of conductor 5, a duplex system, pref- I erably of a type such as used in printing telegraphy, is employed. This mechanism includes relays 11 and 12, one of which is connected to each end of conductor 5 and energized when a call is initiated from the distant station.

It is believed that the invention will now be fully understood from a detailed description of the operation.

The operator at station A, upon receiving the number of the wanted line from a calling subscriber, inserts plug 13 into jack 14 of an idle telephone circuit and then proceeds to operate mechanism 10 in the same manner as described in the previously mentioned co-pending application. As soon as the key of mechanism 10 is operated and the wiper of distributor 6 engages terminal 1 5, a circuit is closed extending from grounded battery, winding of relay 16, wiper of distributor 6, terminal 15, jack 14:, sleeve of plug 13 and mechanism 10 to ground. This circuit is closed each time the wiper of distributor 6 engages terminal 15 to transmit the desired number of impulses over the controlling circuit or conductor 5 to operate a switch at station B and connect telephone circuit 1 to the called line. Relay 16 is energized by the above described circuit and thereby closes a circuit which may be traced from grounded battery, resistance 17, armature of relay l6, make-before-break contact 18, windings of relay 11, conductor 5, windings of relay 12 and resistance 19 to ground. In accordance with the principle of the duplex system of telegraphy, relay 11 is not energized by this clrcuit, but relay 12 at station B will operate. .By' attracting its armature,relay l2 establishes a circuit extending from grounded battery, armature and front contact of relay 12, wiper of distributor 7 when the same engages terminal 20, and winding of relay 21 to ground. Relay 21 is energized and the operation thereof maybe utilized to control a switch (not shown) for stepping brushes 22 onto the terminals'of the wanted line. The switch may be of a construction such as that shown and described in the above-mentioned patent and reference is made thereto for a detailed description of the operation of completing a connection.

Should the operator at station B desire a connection to station A, a plug (not shown) may be inserted into jack 23 of an idle telephone circuit 3 and after setting and releasing the mechanism 10, whichis also associated with the operators position B as previously referred to, a circuit will be closed for relay 24 extending from grounded battery, winding of said relay,'wiper of distributor 9 when the same engages terminal 25, jack 23, sleeve of plug inserted therein and the mechanism 10 at the operators position B to ground. Relay 24 energizes and establishes a circuit extending from grounded battery, resistance 26, armature of relay 24, make-before-break contact 27, windings of relay 12, conductor 5, windings of relay 11, and resistance 28 to ground. In this instance, relay 12 does not operate, but relay 11 will energize and close a circuit from grounded battery, armature and front contact of relay 11, wiper of distributor 8, terminal 29 thereof, and winding of relay 30 to ground. Relay 30 energizes and may be employed in the same manner as relay 21 to control the stepping of brushes 31 of a switch (not shown) onto the terminals to which a called line is connected. Relays 24 and 11 operate in response to each closure of the circuit through terminal 25 and wiper of distributor 9 to transmit the desired number of impulses to the switch.

By reason of the duplex arrangement including relays 11 and 12, it will be obvious that impulses may be transmitted over conductor 5 simultaneously in both directions whereby switches at stations A and B may be operated.

What is claimed is:

1. In a telephone system, two stations, a plurality of telephone circuits extending be tween said stations, a controlling circuit common to and independent of said circuits, switches at each station for completing connections with the other station over said telephone circuits and means for simultaneously controlling switches at both stations over said controlling circuit.

' 2. In a telephone system, two stations, a plurality of telephone circuits extending between said stations, a controlling circuit common to and independent of said telephone circuits, means at each station for completing connections with the other station over said telephone circuits and means at each station for simultaneously controlling the last named means at the other station over said controlling circuit.

3. In a telephone system, two stations, a plurality of telephone circuits extending between said stations, a controlling circuit common to and independent of said telephone circuits, means at each station for completing connections with the other station over said telephone circuits and synchronously operable means at each station for simultaneously controlling the last named means at the other station over said controlling circuit.

4:. In a telephone system, two stations, a plurality of telephone circuits extending between said stations, a controlling circuit common to and independent of said telephone circuits, switches at each station for completing connections with the other station over said telephone circuit, synchronized distributors at each station for transmitting impulses over said controlling circuit to operate the switches at the other station and means permitting said distributors at both stations to operate simultaneously to actuate the switches at both stations.

5. In a telephone system, two stations, a

plurality of telephone circuits extending between two stations, a controlling circuit common to and independent of said telephone circuits, switches at each station for completing connections with the other station over said telephone circuit, means at each station for transmitting impulses over said controlling circuit to operate a switch at the other station and means permitting the last named means at both stations to operate all switches simultaneously.

6. In a telephone system, two stations, a plurality of telephone circuits interconnecting said stations, a controlling circuit common to and independent of said telephone circuits, a switch at each station for completing a connection with the other station over one of said telephone circuits, synchronized distributors at each station for transmitting impulses over said controlling circuit to operate the switch at the other station, and means permitting said distributors at both stations to operate simultaneously.

7. In a telephone system, two stations a plurality of telephone circuits extending between said stations, a controlling circuit common to and independent of said circuits, automatic switches at each station for completing connections with the other station over said telephone circuits, and means for controlling said automatic switches at both stations over said controlling circuit.

8. An automatic telephone system comprising two stations, a plurality of trans- IIllSlOIl o1rcu1ts interconnecting said stations, a controlling circuit common to said transmission circuits, synchronized distributors mission circuits interconnecting said stations, a controlling circuit common to said transmission circuits, synchronized distributors associated with said transmission circuits, a relay at each end of said controlling circuit operable in response to series of impulses transmitted over said controlling circuit from the other end thereof, switches responsive to the operation of said relays, and other relays, one at each station, responsive to said synchronized distributors for controlling the transmission of series of impulses over said controlling circuits simultaneously in both directions. V

In witness whereof, we hereunto subscribe our names this 12th day of December A. D., 1918.

HENRY P. CLAUSEN. CHARLES L. GOODRUM.

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