US1396730A - Telephone system - Google Patents

Description

H. 'P. CLAUSEN AND 0. L. GOODRUM.

TELEPHONE SYSTEM.

APPLICATION FILE!) DEC-28.19I8.

1,396,730. Patented Nov. 15, 1921.

venfa ms Hen r y/P C/fluwen Char/e a i. Quad/um UNITED. s'ra'ras PATENT OFFICE.

HENRY P. CLAUSEN, 0]! MOUNT VERNON, AND CHARLES I1. GOOIDRUM, OF NEW YORK,v

N. Y., .ASSIGNOBS TO WESTERN ELECTRIO COMPANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK. 4

. TELEPHONE SYSTEM.

Specification of Letters Patent.

Patented Nov. 15, 1921.

Application filed December 28, 1818. 1 Serial No. 268,661.

To all whom it may concern:

Be it known-that we, HENRY P. CLAUSEN and CHARLES 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 improvemehts in telephone exchange systems and has particular reference to a circuit arrangement 'for controlling automatic switches over long distance trunks.

In present practice, it is desirable that two wires forming a telephone circuit be employed for other purposes, such as a path for controlling the operation of automatic switches and for the transmission of telegraph messages. Over trunk circuits extending between two widely separated points, it is difiicult, if not impracticable, to simultaneously employ these circuits for all of the above-mentioned purposes or for as many of them as may be desired under conditions existing in a given situation.

An object of the present invention is to provide an improved system which may be simultaneously employed for all or any number of the above related purposes. In accordance with this object, .a plurality of telephone circuits may be provided with a common controllin circuit having distributers at its two en s operating in synchronism, whereby the setting of automatic switches at one end to connect a calling with a called line may be controlled by impulses transmitted over the common controlling circuit from the other end thereof. At the latter end of the common circuit one or more variably operable impulse controlling devices are connected thereto and set in accordance with the desired number of impulses to be transmitted over said circuit. Means, preferably under the control of an operator and associated with the synchronized distributers is operated to release the impulse controlling devices whereby the automatic switching mechanism is set to connect a calling with a called line.

The inventive idea involved is capable of receiving a variety of expressions one of which, or the purpose of illlustrating the invention, is shown in the accompanying drawing; but it is to be expresssly understood that said drawing is employed merely for the urpose of facilitating the descript1on of t e invention, as a whole, and not to define the limits thereof, reference being had to the appended claims for this purpose.

The drawlng illlustrates diagrammatically thecircuit arrangement employed in carrying out the inventlon.

It is believed that the invention will be best understood from a detailed description of the operation in establishing a connection readily understood that as many of these:

circuits may be employed as is necessary to meet exlsting condltlons. The operator, upon belng lnformed of the wanted number,

will select an idle trunk circuit 1 and insert plug 2 thereof into jack 3. A circuit is then closed from grounded battery, windin of 4, sleeve of plug 2, jack 3 and win ing rela of the usual sleeve relay 5, to ground.

Relay 4, by attracting its right armature, establishes a circuit for relay 6 extending from grounded battery, winding of relay 6, front contact and right armature of relay 4 to ground. Relay 6 energizes and closes a lockin circuit for itself extending from grounded battery, winding of relay 6, right armature and front contact thereof, armature and back contact of relay 7 to ground. By attracting its left armature, relay 4 breaks the circuit for release conductor 8 at the back contact of said armature and this circuit remains open until plug 2 is withdrawn from jack 3.

The operatorthen proceeds to set variably operable impulse controlling devices, 'diagrammatically shown at 9 and 10, inaccordance with the digits of the desired number.

One of these devices is provided for each series of impulses to be transmitted and the devices are arranged to operate successively. When the dial of device 9 is operated, contact spring 11 engages contact 12 and prepares a circuit for escape magnet 13 which, upon becoming energized, releases controlling device 9 to permit of the transmission of the desired number of impulses. As soon as the dial of the last device 10 is operated, contact spring 14 associated therewith engages contact 15 and likewise prepares a circuit for escape magnet 16 which operates to release controlling device 10 for the same purpose as described in connection .with magnet 13. Contact spring 17 also engages its associated contact, upon setting of the controlling device 10, and places ground upon the conductor 18. Several trunk lines, such as the trunk 1, may be extended from the operators position B and associated with each line is a relay 19, two of which are shown for the purpose of illustration. The lower armature of each relay 19 is connected to one of the terminals of a distributer 20, the wiper of which is connected to a similar distributer 21 by a controlling circuit or conductor 22 which is common to the group of trunks. Thus, if an operator desires to extend a call on a second line While the first line is still in use, she sets controlling devices 9 and 10 and depresses the key 26 associated with the second line to operate its associated switch. Other distributers 23 and 24 are also connected by a controlling circuit or conductor 25, common to said group of trunks over which the release of a talking connection is controlled, as will later appear. All of these distributers are preferably of a type such as employed in printing telegraphy and are operated in synchronism by any means (not shown) well known in the art.

After setting devices 9 and 10 in accordance with the impulses to be transmitted, the v contact spring 17 to ground. Energization of relay 19 closes a circuit, when the wipers of distributers 20 and 21 engage the respective terminals 27 and 28, which extends from grounded battery, left winding of relay 29 of the connector switch C, terminal 28,

. wiper of distributer 21, conductor 22, wiper of distributer 20, terminal 27, lower armature and front contact of relay 19, contact spring 11, contact 12 and winding of escape magnet 13 to ground. Magnet 13 and relay 29 are simultaneously energized. The escapement mechanism of controlling device 9 is arranged in a manner well known in the art to permit the dial of said device to return toward its normal position upon the release of said magnet which occurs when the wipers of the distributers 20 and 21 disengage the terminals 27 and 28 at the termination of each impulse. Thus upon each revolution of the distributers an impulse for operating the switch C is transmitted over the conductor 22. Energization of relay 29 establishes a locking circuit for itself extending from grounded battery, armatures and back contacts of primary and secondary stepping magnets 31 and 42, front contact and inner armature of relay 29, and right winding of said relay to ground. By attracting its outer armature, relay 29 closes a circuit for slow-to-release relay 30 extending from grounded battery, winding of relay 30, front contact an outer armature of relay 29 to ground. Another circuit is simultaneously closed for primary magnet 31 extending from grounded battery, winding of said magnet, side switch wiper 32 in position 1, front contact and outer armature of relay 29 to ground. Eneregization of magnet 31 breaks the locking circuit for relay 29 at the back contact of said magnet and permits the armatures of said relay to release. Operation of said magnet 31 also steps brushes 33, 34 and 35 of the connector switch 0 from their normal positions and closes off-normal contact 36. Before the locking circuit for relay 29 is broken, however, the wipers of distributers 20 and 21 will disengage their respective terminals 27 and 28 and interrupt the energizing circuit for magnet 13 and relay 29. Upon the first energization of escape magnet 13, a circuit is established for slow-to-release relay 37 extending from grounded battery, winding of said relay, front contact and left armature of magnet 13 to ground; Relay 37 remains energized during the operation of controlling device 9. At the first energization of relay 29, in addition to establishing the energizing circuits for relay 30 and primary magnet 31, it also closes a circuit for slowto-release relay 38 extending from grounded battery, winding of relay 38, front contact and outer armature of relay 29 to ground. Relay 38, in attracting its armature establishes a circuit for escape magnet 39, extending from grounded battery, winding of magnet 39, side-switch wiper 40 in position 1, armature and front contact of relay 38 to ground. The transmission of the first series of impulses for operating magnet 31 proceeds until the return of the dial of controlling device 9 to its normal position at which time contact spring 11 is disengaged from contact 12 and moved into engagement with contact 41. The stepping circuit for .magnet 13 and relay 29 is thereby broken and relay 37 after an interval of time, de-

energizes. During this interval of time,

and the wipers of distributers 20 and 21 slow-to-release relays 30 and 38 also release and upon deenergization of the latter, the ground is removed for the energizing circult of escape ma et 39, which then releases and moves the side-switch wipers into position 2.

When slow-to-release relay 37 deenergizes again engage the respective terminals 27 and 28, a circuit will be closed for escape magnet 16 associated with controlling device 10, and also for relay 29. This circuit extends fromgrounded battery, left winding of relay 29, terminal 28, wiper of distrlbuter 21, conductor 22, wiper ofdistributer 20, terminal 27, lower armature and front contact of relay 19, contact spring 11, contact 41, backcontact and armature of 'relay 37, contact spring 14, contact 15, and

winding of magnet 16 to ground. Operation of magn et 16 controls the movement of the dial of device 10 toward its normal position in the same manner as described in connection with controlling device 9. Ener g zation of rela 29 again establishes the previously described locking circuit for itself and the circuits for slow-to-release relays'30 and 38. Energi'zation of relay 38 again establishes a circuit for escape magnet 39 through side switch wiper 40 in its second posltion. Upon the first ener ization of relay 29 a circuit is also closed fbr the secdndary stepping magnet 42 extending from grounded battery, winding of magnet 42, side switch wiper 32 in position 2, .front contact and outer armature of relay 29 to ground. Operation of secondary magnet 42 breaks the locking circuit of relay 29 after the wipers of the distributers 20 and 21 have passed over terminals 27 and 28, and relay 29 releases. Impulses continue to be transmitted to secondary stepping magnet 42 u n each revolution of the wipers of distributers 20 and 21, until thedial of controlling device 10 reaches its normal position and disengages contact springs 14 and 17 from their associated contacts, which operation breaks the stepping circuit for magnet 16 and relay 29, and also removes the holding ground for relay 19 which then deenergizes. Secondary magnet 42, in response to the second series of impulses, step brushes 33, 34 and, 35' onto the terminals 43, 44 and 45 of the telephone line individual to substation apparatus D.

Assuming that the called substation D is busy, ground will be found upon test terminal 43 and upon de'e'nergization of slowto-release relay 30, at the termination of the second series of impulses, a circuit willbe closed for release magnet 46 extending from grounded battery, left winding of magnet 46. back contact and armature of. relay 30,

side-switch wiper 47 in position 2, brush 33 and terminal 43 to ground. Release magnet 46 is energized and locked up over the circuit extendln from grounded battery, right winding'of contact 36 to ground. Relay 38 also deenergizes after. the termination of the second series of impulses but, being slow to release, sufficient interval of time will lapse to permit release magnet 46 to energize and thus establish another circuit for escape magnet 39 which extends from grounded battery, winding of magnet 39, front contact and outer left armature of release magnet 46 to ground. Therefore, escape magnet 39 will be unaffected by the release of relay 38 and consequent removal of ground from the armature thereof. Side-switch wipers of connector switch C will therefore be prevented from oving to position 3'. Energization of rele i se magnet 46 returns switch C to normal and .also applies a busy tone to the telephone circuit which extends through the busy tone apparatus 48, front contact and inner left armature of release magnet- 46 to the upper side of the telephone'circuit. The subscriber at substationA, hearing this busy tone, replaces his receiver upon the switchhoo-k which operation extinguishes a supervisory lamp (not shown) at operators position B. The operator then removes plug 2 from jack 3 and thereby breaks the circuit for relay 4, which then releases.

Should substation D be idle, slow-to-release relay 30 will become denergized at the termination of the second series of impulses and no potential being found upon test terminal 43, release magnet 46 will remain deenergized. Relay 38 also releases and removes ground; at its armature from thecircuit of escape magnet 39 which deenergizes and moves the side-switch wipers into position 3. Escape magnet 39 again energizes in position 3 over a circuit extending from grounded battery, winding of magnet 39, side-switch wiper 40 in position 3, armature and back contact of marginal relay 52 to ground. Ringing current isthen applied to the line over a circuit extending from ringing current generator 53, winding of relay 52, front contact and armature of escape magnet 39, side-switch wiper 53 in position'3, brush. 35, terminal 45, the ringer apparatus at substation D, terminal 44, brush 34 and side switch wiper 54 in position 3 to ground. Sufficient current does not pass through marginal relay 52 during the ringing operation to cause said relay to energize, but upon the removal of the receiver at substation D, the ringer apparatus thereat is shunted and relay 52 becomes energized. Operation of relay 52 removes ground from the armature thereof, and causes escape magnet 39 to again release and move the sideswitch wipers into position 4. Talking current is now applied to the telephone line exmagnet 46, right armature and front contact thereof, and oif-normal tending from grounded battery, right winding of relay 55, lower side of the telephone line, side-switch wiper 54 in position 4, brush 34, terminal 44, substation apparatus 1), terminal 45, brush 35, side-switch wiper 53 in position 4, and left winding of relay to ground. While side-switch wiper 4? is in either position 3 or 4, a ground will be applied to test terminal 43 through wiper 47 and brush 33 so that the line individual to substation D will test busy to any other connector switch.

At the termination of the conversation, the subscriber at substation A, by replacing his receiver, extinguishes the supervisory lamp at the operators position B as previously referred to. Removal of plug 2 from jack 3, by the operator, breaks the circuit for relay 4, which then releases. As soon as the wipers of distributers 23 and 24 engage terminals 49 and 50, a circuit will be closed extending from grounded battery, winding of relay 7, front contact and left armature of slow-to-release relay 6, back contact and left armature of relay 4, conductor 8, terminal 49, wiper of distributer 23, conductor 25,

wiper of distributer 24, terminal 50 andleft winding of relay 51 to ground. Relay 7 energizes and removes the holding circuit for relay 6, which in releasing interrupts the circuit for relay 7 to dee'nergize this relay. Relay 51 is energized by the circuit just described and locks up over the circuit extending from grounded battery, right winding of relay 51, inner armature and front contact thereof, and off-normal contact 36 to ground. By attracting its outer armature, relay 51 places round upon the conductor 56 and causes re ease magnet 46 to energize over a circuit extending from grounded battery, left winding of magnet 46,. conductor 56 and outer armature of relay 51 to ground. Release magnet 46 looks up over the previously desc-rlbed circuit through the off-normal contact 36. -Energi'zation of release magnet 46 operates to restore switch C to normal position, whereupon off-normal contact 36 is opened and the switch is in position for another operation.

lVhat is claimed is:

1. In a telephone system, a plurality of trunk lines, a plurality of switches at which each trunk line terminates, a circuit independent of and co-extensive with said trunk lines and means operating in synchronism for controlling any of said switches over said independent circuit.

2. In a telephone system, calling and called lines, a plurality of link circuits, a controlling circuit common to said link circuits, means for connecting any one of said calling lines with any link circuit, synchronously operable means for changing the electrical condition of said controlling circuit and means responsive to certain of such said independent circuit to control the operation of said connecting means.

4. In a telephone system, calling and called lines, trunk lines for'establishing connections between said calling and called lines, a circuit common to said trunk lines, switches for connecting said trunk lines to said called lines, synchronously operable means for transmitting impulses over said common circuit for operating said switches and means individual to each trunk line for causing the last named means to operate one of said switches.

5. In a telephone system, a calling line, a called line, a plurality of telephone circuits for establishing a connection between said calling and called lines, a controlling circuit common to said telephone circuits, synchronized distributers for transmitting impulses over said controlling circuit, and means responsive to the impulses transmitted for connecting one of said telephone circuits to said called line.

6. In a telephone system, a calling line, a called line, a plurality of telephone circuits for establishing a connection between said calling and called lines, a controlling circuit common to said telephone circuits, synchronized distributers for transmitting impulses over said controlling circuit, and an electrically operated switch controlled by said impulses for connecting one of said telephone circuits to said called line.

7. In. a telephone system, a calling line, a called line, a plurality of telephone circuits for establishing a connection between said calling and called lines, a controlling circuit common to saidtelephone circuits, synchronized distributers connected to the ends of said controlling circuit for transmitting impulses, successively operable impulse controlling means associated with said synchronized distributers for determining the number of impulses to be transmitted, and means responsive to the impulses transmitted for connecting one of said telephone circuits to said called line.

8. In a telephone system, a calling line, a called line, a plurality of telephone circuits for establishing a connection between said calling and called lines, a controlling circuit independent of said telephone circuits, synchronized distributers for transmitting impulses over .said controlling circuit, and an electrically operated switch controlled by said impulses for connectin one of said telephone circuits to said ca led line.

9. In a telephone system, a calling line, a called line; an operators position, a plurality of circuits for establishing a connection between said calling and called lines, a controlling circuit common to said telephone circuits, synchronized distributers for transmitting impulses over said controlling circuit, means responsive to said impulses for connecting one of said telephone circuits to said called line and successively operable impulse controlling means at said. operators position for determinin .the number of impulses to be transmitted.

10. In a telephone system, a calling line,

a called line, an operators position, a plurality of circuits for establishing a connection between said calling and called lines, a controlling circuit common to said telephone circuits, synchronized distributers for trans Initting impulses over said controlling circuit, means responsive to said impulses for connecting one of said telephone circuits to said called line, and a relay for causing the operation of said successively operable impulse controlling means,

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

HENRY P. CLAUSEN. CHARLES L. GOODRUM.

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