US1387250A - Telephone-exchange system - Google Patents

Description

C. B. FOWLER.

TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED SEPT.23, 1919.

1,387,250, Patented Aug. 9,1921.

by W m y.

UNITED STATES PIA-TENT OFFICE.

CLARENCE B. FOWLER, OF NEW YORK, N. Y., ASSIGNOR WESTERN ELECTRIC COM- PANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

TELEPHONE-EXCHANGE SYSTEM.

l Specification of Letters Patent; 7

Patented'Aug. 9, 1921 Application filed September 23, 191a serial No. 325,609.

To all whom it may concern:

Be it known that I, CLARENCE a. citizen of the United States, residin at New York, in the county of New'York, State of New York,',have invented certain new and useful Improvements in Telephone-EX- In some telephone exchange systems it is I desirable that the subscriber may be enabled to control the line signaling device, as well as the supervisory signaling device, of a link circuit connected with the line. This feature is especially desirable in case the subscriber desires to recall the operator.

It is the object of this invention .to provide an improved system of signaling between the subscriber and the operator, whereby it is possible for the subscriberv to control the line signal independently of the connection of a link circuit with the associated line. v

To attain this object in accordance with a feature of the invention, means is provided associated with a line circuit whereby the connection of a link circuit with the line renders the link circuit supervisory signaling device responsiveto a subsequent deenergization of the line relay, and the line signaling device responsive to a subsequent energization-of such relay without altering the condition of the interconnected talking conductors. c

This and other features of the invention not specifically mentioned above-will be apparent from the following specification and the annexed drawing,wl1ich shows diagrammatically a telephone line circuit embodying the invention and a. portion of an operators cord circuit for cooperationtherewith.

In the drawing, a line A: connects a subscribers station of any usual type with a central office and terminates thereat in the usual jack 1. A line lamp 3 associated with the jack 1 is controlled by a line relay 4. A cord circuitB, of any usual type, provided with a supervisory signaling lamp5 and an operators listenin' key 6 terminates in a plug 2 fOfCOllIlGCtlOIl with the line A, only suliicient portions of such cord-circuit being shown to properlyillustrate the invention. A double wound sleeve relay 7 and a slow B. FOWLER,

release relay 8 cooperate with the line relay 4 to control the supervisory signaling lamp 5 and the line lamp 3 duringa connection of the link circuit B with the line circuit A.

It is thought that the invention may be more fully comprehended from the following description of the operation of the system, shown on the drawing. 7

The subscriber at the station associated with the line A initiatesa call in the usual manner by removing the telephone receiver thereat, thereby operating relay 4 over a circuit established from battery through the right-hand winding of relay 4, one line conductor, the apparatus at the subscribers station, the other line conductor and the lefthand winding of relay 4 to ground. Lamp 3 is lighted over a circuitestablished from battery through lamp 3,;the normal contact of relay 7 and the alternate contact of relay 4 to ground. In response to the lighting of lamp 3, the operator inserts plug 2 of link 'circuit B into jack 1 oflin'e circuit A, thereby operating relay 7 over a circuit established from battery through supervisory lamp 5, sleevecontacts of plug 2 and jack 1, and both windings of relay 7 to ground. The high resistance of such circuit prevents thelighting oflamp The opening of the' normal contact of relay 7 extinguishes linelamp 8.

The number of the line desired may then be obtained by the operator by the actuation of the listening key 6, and the connection may be established with the calledline in the usual manner.

Upon completion of the conversation, the restoration of the receiver at the subscribers stationv associated withthe line A releases relay 4:, thereupon operating slow-release relay'8 over a circuit extending from battery v through the winding of relay'8,.,the normal contact of relay 4 and the alternate contact of relay 7 to ground. Relay 8 thereupon locks in an operated conditionover a circuit established. from battery through the winding and the middle alternate contact of relay 8 andthe alternate contact of relay7 to ground. The closure of the right-hand contact of relay 8 short-circuits the high resistance left-hand winding of relay 7, thereby sufiiciently reducing the resistance in thecircuit containing supervisory lamp 5 to permit the lighting of such lamp to serve. as a disconnect signal. Due to the,

locking of relay 8 under the control of relay 7, the lamp 5 remains lighted while the plug 2 remains in the ack l, but the removal of the plug, in response to the disconnect signal, restores all apparatus to the normal condition.

However, in case the subscriber desires to initiate a recall, the removal of the receiver from the switchhook, while the plug 2 re mains in the. jack 1, causes the reoperation of relay 4 lighting the line lamp 3 over a circuit extending from battery through lamp 3, the left-hand contact of relay 8 and the alternate contact of relay 4 to ground. The

operator upon observing such recall signal, may actuate the listening key 6 and upon ascertaining that the subscriber desires another connection removes the plug 2 from the jack 1, thereby restoring the apparatus vention the subscriber may recall the opera tor during the continuance of a connection by the relighting of the line lamp supplementing the lighting of the supervisory lamp of the cord circuit.

What is claimed is:

1. In a telephone exchange system, a line circuit, a link circuit for connection therewith, a signalingdevice associatedwith the line circuit, a signaling device associated with the link circuit, a relay associated with the line circuit, a second relay controlled by the first relay, alocking winding for said second relay, means for causing the second relay to lock in the operated position through its locking Winding to maintain the link circuit signaling device in an operated condition during the continuance of the connection, and means for controlling by the joint action of both relays both signal devices.

2. In a telephone exchange system, a line circuit, a link circuit for connection therewith to establish a talking circuit including conductors of the interconnected line and link circuits, a relay associated with the line circuit, a signaling device responsive to the energization of the relay, a signaling device for the link circuit, means responsive to the connection of the link circuit with the line circuit to restore the first mentioned signaling device, means responsive to the deenergization of the relay to operate the link circuit signaling device, and means. independent of the talking circuit and responsive to a subsequent energization of the relay during the continuance of the connection to reoperate the line signaling device.

naling device,

3. In a telephone exchange system, a line circuit, a link circuit for connection therewith, a relay associated with theline circuit, a signaling device responsive to the energization of the relay, a signaling device for the link circuit. means responsive to the connection of the link circuit with the line circuit to restore the signaling device associated with the line circuit, means responsive to the deenergization of the relay to operate the. signaling device associated with the link circuit, means responsive to a subse sequent energization of the relay during the continuance of the connection to reoperate the line signaling device and means for maintaining said supervisory signaling device in an operated condition during the continuance of the connection.

l. Ina telephone exchange system, a line circuit, a link circuit for connection therewith, a signaling device associated with the line circuit, a signaling device associated with the link circuit,subscriber and operator controlled means for operating both signaling devices during the connection of the link circuit with the line circuit, and

means for maintaining said link circuit signaling device in an operated condition in-- dependently of the subscriber controlled means.

5. In a telephone exchange system, a line circuit, a link circuit for connection therewith, a relay associated with the line circuit, a supervisory signaling device for the link circuit, a high resistance circuit completed therefor upon the connection of the link circuit with the line circuit, means responsive to a denergization of the relay to reduce the resistance of the high resistance circuit thereby causing the operation of the supervisory signaling device, and means for maintaining the supervisory signaling device in an operated condition independently of subsequent energizations of the relay.

6. In a telephone exchange system, a line circuit, a link circuit for connection therewith, arelay for the line circuit, a signaling device controlled therebyra supervisory signaling device for the link circuit, asecond relay operating in response to the connection of thelink circuit with the line circuit to restore the line signaling device, and a third relay operating upon the deenergization of the first mentioned relay andlocking under control of the second relay to op- .erate the supervisory "signaling device, and a circuit for the line signaling device prepared by said third relay and completed upon a subsequent energization of the first mentioned relay to reoperate the line sig- 7. In a telephone exchange system, a line circuit, a relay associated therewitln'a signaling device responsive to the energization of the relay, a link circuit for connection with the line circuit, means responsive to the connection of the link circuit With the line circuit to remove the line signaling device from the control of the relay, and means responsive to the deenergization of the relay to return the line signaling device to the control of the relay.

8. In a telephone exchange system, a subscribers line circuit, a signaling device therefor, a link circuit for connection With the line circuit, a signaling device therefor,

subscriber controlled means for operating both devices during a connection of the link circuit with the line circuit and operator controlled means for maintaining the link circuit signaling device in an operated con dition during the continuance of such connection.

In Witness whereof, I hereunto subscribe my name this 19th day of September, A. D. 1919.

CLARENCE B. FOlVLER.

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