US1230578A - Telephone signaling system. - Google Patents

Description

E. E. HINRICHSEN.

TELEPHONE SIGNALINGSYSTEM.

APPLICATION FILED JULY 19. 1915.

1,230,578. Patented June 19, 1917.

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UNITED STATES PATENT OFFICE.

EDWARD E. HINRICHSEN, OF NEW YORK, N. Y., ASSIGNOR, BY MESNE ASSIGNMENTS,

T0 WESTERN ELECTRIC COMPANY, INCORPORATED, A CORPORATION OF NEW YORK.

TELEPHONE SIGNALING SYSTEM.

Specification of Letters Patent. Patented June 19 1917,

Application filed July 19, 1915. Serial No. 40,687.

To all whom it may concern:

Be it known that I, EDWARD E. HINRIOH- SEN, a citizen of the United States, residing In accordance with this invention there is provided a signaling device forming a part of the link circuit, said device being capable of giving a plurality of signals by varying the strength of current used to operate said device. Such a signaling device may comprise a supervisory lamp in an operators cord circuit so arranged that the flow of current therethrough may be controlled in such a manner as to give distinctive indications for difierent circuit conditions.

This invention is illustrated diagrammatically in the accompanying drawing.

Subscribers substations A and B are connected by means of line wires 1 and 2 to a line jack 3 located at the central office. The usual line equipment, comprising a line relay 4 controlling a line lamp 5 and a cut-off relay 6, is associated with each of these hnes. There is provided at the central oflice an operators cord circuit which includes a source of current, an answering plug 7 and a calling plug 8, and has connected in the talking strands supervisory relays 9 and 10 respectively.

Upon the initiation of a call by subscriber A, the line relay 4 is energized in the usual manner, efiecting the lighting of the hue lamp 5. The operator, observing the lighted ing plug 7 into the line jack 3, thereby causing the operation of cutoff relay 6 and supervisory relay 9. The relay 9 in pulling up its armature closes contact 12,. which completes a circuit through relay 13 over the following path: battery, lamp 14, contact 12, conductor 15, coil ofrelay 13, conductor 16, contact 17 to ground. The actuation of the relay 13 automatically connects the operators telephone set inthe cord circuit. It may be mentioned here that due to the high resistance of the winding of the relay 13,

the lamp 14 is preventedfrom lighting upon the closure of the circuit just described.

Assuming that subscriber A desires to converse with subscriber B, the operator upon learning of this fact inserts the calling plug 8 into the line jack 3. By this operation ringing current is automatically impressed upon the called subscribers line by the energization of the ringing relay 18 over the following path: battery, lamp 19, conductor 20, contact 21, conductor 22, coil of relay 18, conductor 23, contact 24 to ground. It will be noticed that relay 25 was energized when the operator inserted the plug 8 into jack 3 by the closure of the following circuit: battery, coil of relay 25, conductor 26, sleeve side of plug 8 and jack 3 respectively, coil of relay6 to ground. It will also be noted that during the application of the ringing current to the called subscribers line, the lamp 19 and the relay 18 are connected in series and, due to this fact, the brilliancy of the lamp 19 will be below normal or less than when no resistance is included in its energizing circuit. This feature may serve as a signal for notifying the operator that ringing current is being sent over the line of subscriber B.

Upon the removal of the receiver by the subscriber at substation B, enough resistance is removed from the line circuit to operate the marginal relay 30, which is energized over the following path: from a source of alternating current through the coil of relay 30, contact 31, ring side of plug 8 and jack 3 respectively, line wire 1, through the substation B, returning over line wire 2, tip side of the jack 3 and plug 8 respectively, contact 32 to ground. The energization of the operation over the following path: battery, condition of line lamp 5, inserts the answerresistance 34, coil of relay 33, conductor 35, 36, contact 24 to ground. The energization ofthe supervisory relay 10 takes place simultaneously with the energization of the relay 30. It may be mentioned here that the relay 30 is of a slow releasing type so as to allow suflicient margin to insure the operation of the relay 33. The operation of the relay 33, in pulling up its right-hand armature, opens its back contact 21 and closes its front contact 37. The opening of contact 21 effects the denergization of the ringing relay18 and the extinction of the lamp 19. The extinguishing of the lamp 19 may serve as a signal to the operator that the called subscriber has responded. By the opening of contact 38 the short circuit about the relay S53 is permanently removed until it becomes deenergized.

\Vhen the subscribers A and B have linished conversing, upon the replacement of the receiver at substation B, the supervisory relay 10 is deene-rgized, which in releasing its arn'iature permits the closure of contact d2, thus establishing the following circuit through the lamp 191 battery, lamp 19, con.- ductor 20, contact 37, conductor '3, contact 2 to ground. It will be noted that the lamp 19 can now burn at its full brilliaiuzy due to the fact that no resistance is included in the circuit just described. The operator upon observing the lighting of the lamp 19 will be informed that the subscriber at substation 13 has replaced his receiver upon the switch-hook. The replacement oi the receiver by subscriber A will effect the lighting of the lamp ll by the closure of the following circuit: battery, contact 50, conductor 51, contact 24, to ground. The lighting of the lamps l-l; and 19 will indicate to the operator that she is now at liberty to take down the connection existing between the subscribers A and 13.

From the above it will be apparent that by controlling the strength of current lloW- ing through a signaling device, a plurality of indications may be obtained from the same device, and each indication may tunetion as a signal for a distinct operation on the part of the operator. By virtue of the tact that one of these indications is present during the application of ringing current to the line of the called subscriber, the supervisory work of the operator is greatly re lieved by eliminating the necessity of her going in on the line of the called subscriber to ascertain its condition.

What claimed is:

1. In a telephone system, a subscribers line, a link circuit, a source of ringing current, a relay for connecting said source to the line. a signaling device, an operating circuit for and including both the relay and the signaling device completed upon connection ot the link circuit with the line, means in the link circuit and controlled from the station on the line for opening the operating circuit, a second operating circuit for the signaling device, and means controlled from the station on the line for completing the second operating circuit.

2. In a telephone system, a subscriber's line, a link circuit, a source of ringing current. a relay for connecting said source to the line. a signaling device. an operating circuit for and including both the relay and in the link circuit and controlled from the station on the line for opening the operating circuit, a second operating circuit of substantially lower resistance than the first operating circuit for the signaling device, and means controlled from the station on the line for completing the second operating circuit.

3. In a telephone systei'n, a subseribens line, a link circuit, a source of ringing current, a ringing relay for connecting said source to the line, a signaling device, an operating circuit for and including both the ringing relay and the signaling device conipleted upon connection of the link circuit with the line a relay in the link circuit operating upon removal of the receiver from the switchhook at the station on the line for opening the operating circuit and excluding the ringing relay therefrom, a supervisory relay, and an operating circuit for the signaling device alone completed upon the deenergization of the supervisory relay.

4. In a telephone system, a subscribers line, a. link circuit, a source of ringing current, a ringing relay for connecting said source to the line, a signaling device, an operating circuit for and including both the ringing relay and the signaling device com pleted upon connection of the link circuit with the line, a relay in the link circuit operating upon removal of the receiver from the sivitchhook at the station on the line for opening the operating circuit, a supervisory relay, and a second operating circuit for the signaling device of substantially lower resistance than the first ope ating circuit completed upon the deenergization of the supervisory relay.

5. In a telephone system, a subscribens line, a link circuit, a source of ringing current, a ringing relay for connecting said source to the line, a signaling device in the link circuit, an operating circuit for and including both the ringing relay and the signaling device completed upon the connection of the link circuit with the line, a relay in the link circuit operating upon the removal of the receiver from the switchhook at the station on the line for opening the operating circuit, a supervisory relay, and a second operating circuit for the signaling device of substantially lower resistance than the first operating circuit par tially established upon the operation of the second-mentioned relay and completely established upon the subsequent de'energization of the supervisory relay.

In 'itness whereof, I hereunto subscribe my name this 15th day of July, A. I). 1.915.

lCDlVARD E. HINRICHSEN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

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