US1553311A - Telephone-exchange system - Google Patents

Description

Sept. 15, 1925-.

. .U. s. FORD TELEPHONE EXCHANGE SYSTEM Filed May 5-, 1924 M H M QUE? .m. WI mm? mm? .MMZ

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UNITED. STATES ULYSSES S. FORD, OF HOLLIS, NEW YORK, ASSIGNOR T0 WESTERN ELECTRIC COM- I PATENT OFFICE.

IPANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

TELEPHONE-EXCHANGE SYSTEM.

Application filed May 5,

To all whom it may concern:

Be it known that I, ULYssns S. FORD, a citizen of the United States of America, residing at Hollis, Long Island, in the county .of Queens and State of New York, have invented certain new and useful Im provements in Telephone-Exchange Systerns, of which the following is a full, clear, concise, and exact description.

My. invention relates to improvements in telephone exchange systems, and particularly to trunking systems between operators positions in the same or difi'erent oflices.

In such trunking systems, it is common practice to provide order-wire circuits so that the operators may converse with one another in order to assign trunks, etc. Each order wire is ordinarily provided with an individual button or key for connecting the operators telephone set with its associated order-wire.

In case a large number of order-wires are employed, a' row or several rows of buttons are provided arranged in strips or banks and occupy considerable space on the keyshelf of the switch-board.

The main object of my invention is to reduce the number of such buttons and at the same time increase the number of orderwire circuits.

This result is accomplished by cooperation between the buttons whereby if one button alone is operated a certain order wire circuit is selected, but if two adjacent buttons are simultaneously operated, a different or-' der wire circuit is selected.

My invention is illustrated in the accom panying drawing:

The operators telephone set comprises the usual receiver R, transmitter T, induction coil I, coils 1 and 3, condenser C, and battery supply 2. At the top of the drawing are shown diagrammatically four groups of trunks terminating in jacks 10 to 17 inclusive extending to other oflices.

Associated with each group of trunks is an order wire circuit such as 6, 7, 8 and 9. A portion of two rows or strips of order buttons are shown. The first row contains the buttons X and A, while the second row contains the buttons Y and B. Although but two buttons are shown in each row it is understood that any number of buttons may be used. Associated with each button are 1924. Serial No. 711,036.

two relays utilized when adjacent buttons are operated.

The operation of the system is as follows:

In case the operator wishes to trunk a call to the X office, she will depress the button X which will connect the telephone set to the order-wire circuit extending to the operator at the X ofiice. The telephone set is connected to the order-wire circuit as follows:

Conductors 5, contacts 20 of relay E, contacts 21 of button X, order-wire circuit 6 to the X office. The operator at the X oflice assigns a trunk such as 10 in the group whereupon the first operator places the plug of one of the cord circuits into the assigned jack. I

In case the call is to. be extended to the Y'office, the operator depresses button Y, thereby connecting the telephone set to the order-wire circuit 7 by way of conductors 5. In case the call is to be extended to the Z oflice, the operator depresses buttons X'and Y at the same time. This causes the operation of relays H, G,- E and F by closing the following circuit: ground, winding of relay I'I, winding of relay G, contacts 28 of the button Y, 30, contacts 29 of button X, winding of relay E, winding of relay F, battery to ground. The operation of relays E and G connects the conductors 5 extending to the telephone set to the orderwire circuit 8 as follows: conductors 5, contacts 23 of relay G, contacts 22 of relay E, order wire circuit 8 to oflice Z.

The operation of relays E and F disconnects the telephone set from the contacts of button X preventing its connection to the order-wire 6. The operation of relays G and H likewise disconnects the telephone set from the contacts of button Y preventing its connection to order-wire 7.

In case a call is to be extended to ofiice Z the operator depresses buttons X and A. The operation of these two buttons completes the following circuit: ground, winding of relay J, winding of relay I, contacts 26 of button A, 32, 31, 30, contacts 29 of button X, winding of relay E, winding-of relay F, battery 50 to ground.

The operation of relays F and J connects the operators telephone set to the order wire circuit 9 as follows: conductors 5, contacts 35 of relay J, conductors 36 contacts 37 of relay F, conductors 9 to office Z From the foregoing it will be noted that the depression of two buttons X and Y select an additional circuit while the depression of buttons X and A also selects an additional circuit. The co-operation of buttons X, Y and A brings into service two circuits in addition to the three circuits allotted to buttons X, Y and A.

While I have shown two relays, allotted to each button, in order to provide but a small number of contacts for each relay it of course follows that all contacts may be placed on one relay.

That I claim is:

1. In a telephone exchange system, the combination of a plurality of order buttons, a plurality of circuits greater than the number of said buttons, an operators telephone set, a relay individual to each button, means controlled by the actuation of a certain of said buttons to maintain the relay inclividual thereto in a desired condition to connect said telephone set to a corresponding one of said circuits, and means controlled by the actuation of said key and other of said keys to change the condition of said relay and other of said relays to cause the connection of said telephone set to other of said circuits.

2. In a telephone exchange system, the combination of a plurality of order buttons arranged in rows, a plurality of circuits greater thanthe number of said buttons, a telephone set, means controlled by the operation of a single button for connecting the telephone set to a particular circuit, and means controlled by the operation of said button and a button in any of said rows for connecting said telephone set to diflerent circuits. v

3. In a telephone exchange system, the combinationof a plurality of order buttons a circuit individual to each button, an operators telephone set, means controlled by the operation of each of said buttons to connect the circuit individual thereto to said telephone set, additional circuits, and means controlled by the simultaneous operation of one of said buttons with various of said buttons to variously connect said telephone set to said additional circuits.

4. In a telephone exchange system, the combination of a plurality of order buttons arranged in a row, a circuit individual to each button, an operators telephone set, means controlled by the operation of a single button to connect its individual circuit to said telephone set, additional circuits, arelay individual to each button, means con trolled by the operation of a plurality of buttons for operating said relays. to connect said telephone set to said additional circuits. 7

In witness whereof I hereunto subscribe my name this 29th day of April, A. D.

ULYSSES sFoRD.

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