US644594A - Telephone system. - Google Patents

Description

No; 644,594. Patented Mar. 6, I900.

J. w. GORE. P

TELEPHONE SYSTEM.

(Application filed Aug. 16, 1899.)

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UNITED STATES PATENT FFICE.

JOSHUA YVALKER GORE, OF CHAPEL HILL, NORTH CAROLINA.

TELEPHONE SYSTEM.

SPECIFICATION forming part of Letters Patent No. 644,594, dated March 6, 1900.

Application filed August 16 1899.

To aZZ whom it may concern:

Be it known that LJOSHUA WALKER GORE, of Chapel Hill, in the county of Orange and State of North Carolina, have invented certain new and useful Improvements in Telephone Systems; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to an improvement in telephone systems and is intended for use in connection with telephone systems in which two or more telephones are in the same mainline circuit, one object of the invention being to provide switch devices for party-line circuits by means of which several parts or sections of the same line can be used simultaneously without interfering with each other.

A further object is to so construct a partyline system that any part of the line not in use will always be ready for service.

A further object is to so constructa partyline system that privacy of conversation will be assured.

A further object is to provide switch devices for a party-line system which shall be simple in construction, easy to manipulate, not liable to get out of order, and which shall be effectual in all respects in the performance of its functions.

With these objects in view the invention consists in certain novel features of construction and combinations and arrangements of parts,as hereinafter set forth, and pointed out in the claims.

In the accompanying, drawings, Figure 1 is adiagramillustratingmyimprovements. Fig. 2 is a detail view of the locking device.

A represents a revoluble disk of non-conducting material, preferably located within the casing (not shown)'of an ordinary telephone signaling apparatus and provided with a depending arm or lever 1 for operating it. The disk A is also provided with a lug 2, normally disposed midway between two stops 3 4, with one or the other of which said lug engages to limit the extent of movement of the disk. The switch-disk is provided with a spring 3, secured at one end to the shaft of said disk and having its free end passed loosely between and guided by pins 3*, so as Serial No. 727,436. (No model.)

to cause said disk to return to its normal position when released.

Conducting-strips 5 6 '7 7 are secured in any suitable manner to one face of the disk, at or near the periphery, and spaced apart. Contact-fingers 8, 8 9, 9, 10, and 11 are secured to a suitable frame or support and adapted to be engaged by the conductingstrips on the disk, the finger 8 being normally in contact with the strip 5, the finger 9 restin g on the strip 6, the finger S engaging the strip 7, the finger 9 in contact with the strip 7*, and'the fingers 10 and 11 normally disposed between the conducting-strips 5 and 6.

One side of the line (represented in the drawings by the wired) is connected with the conducting-strip 5, and the line at the other side of the station (represented by the wire 1)) is connected with the strip 6. The strip 7 is connected with a return line-wire b, and the strip 7' is connected with a return line-wire a. The finger 10 is connected by a wiref with the secondary windingf of the usual induction-coil, and the latter is included in circuit with a telephone-receiver g and the con tact-fingers 8 and 9. The telephone-transmitter h is included in a normally-open circuit with the primary winding-i of the induction-coil, a batteryj, and the fingersldll. The fingers 8 9 are connected by wires 70 m with the respective terminals of the coils of the signaling device 13.

An arm 14 is secured to the shaft of the switch-disk so as to move with the latter, and below said arm a lever 15 is pivotally supported at one end, the other end of said lever being provided with a hook 16 for the reception of the hand phone or receiver g. The lever 15 is provided at a point directly under the arm 14 and in line with the shaft of the switch with an upwardly-projecting lug 17, and under said lever a spring 18 is disposed for pressing it toward the arm 14; when the hand phone or receiver is removed from the hook 16. From this construction and arrangement of parts it will be seen that when the switch-disk is turned in one direction or the other and the hand phone or receiver removed from the hook 16 the lever 15 will rise and the pin or lug 17 will become disposed alongside one edge of the arm 14, thus holding the switch-disk in the position to which it has been moved against the tension of the spring 3. Vhen the hand phone or receiver is replaced on the hook 16, the lever will descend against the resistance of the spring 18, thus removing the pin or lug 17 from the arm 14 and releasing the latter, and the switch is returned to normal position by the spring 3.

From Fig. 1, which represents the normal positions of the parts of the switch, it will be seen that the circuit is completed from the line a through the switch by conducting-strip 5, finger 8, wire 7;, signaling device 13, wire m, finger 9, strip 6, to line-wire b. The return-circuit is from wire I), strip 7, finger S, thence to finger 9", strip 7, and wire ct. Both the battery-circuit and the circuit through the receiver are open. To communicate with a station to the right, the station will first be called by means of the signaling device, and then the switch is turned clockwise to the limit of rotation, when the conducting-strip 5 will move away from contact with the finger 8, thus severing the line-circuit, and at the same time the strip 7 is moved from contact with the finger 8, thus severing the return-circuit. Immediately afterward, when limit of rotation has been reached, the strip 5 is in contact with the fingers 1011, and strip 7 is in contact with finger 8. Strip 6 remains in contact with finger 9, and strip 7 remains in contact with finger 9'1. In this position of the switch the line a is connected through strip 5, finger 10, secondary coil f, receiver g, finger 9", strip 7, to return-wire a. The battery-circuit through the transmitter will also be closed. In this position of the switch communication may be had with a station to the right, the operator at which station has turned his switch counter-clockwise or to the left.

\Vhile the switch at a station is turned to the right the portion b of the line is connected to the return-wire I) through the calling device, because the strip 7 will be in contact with finger 8, in circuit with the signaling device 13, finger 9, and strip 6.

To communicate with a station to the left, the operator will turn the switch to the left or counter-clockwise, when the portion Z) of the line will be connected, through receiver, to the portion b of return-wire and the portion of line a connected, through signaling device, to a of return-wire.

To avoid the annoyance of every bell on the line ringing when a station is called, the switch may be turned before signaling, when the bells at one side of the calling-station only will be sounded. That the bells to the right only may ring, the switch must be turned counter-clockwise before signaling.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a party-line telephone system,the combination with a main line and a return-line, of a switch having a movable part and a series of contact-fingers, a series of four insulate'd conducting-strips secured to said movable part and having the line-wire connected with two of them, and the return-line connected with the other two of said strips, a signaling device connected in circuit with two of said fingers and local telephone-circuits connected with the remaining fingers, whereby when the switch is turned, one side of the main line will be closed through the signaling device and one side of the return-line and the other side of the main line closed through the local telephone-circuits and the other side of the return-line.

2. The combination witharevolublespringretained disk, means for operating said disk and means for limiting its movements in both directions, of a series of insulated conducting-strips secured to said disk, main-line wires attached to two of said strips, return-wires for the respective sides of the line connected with the other strips, fingers normally resting on said first-mentioned strips, a signaling device included in circuit with said fingers, two contact-fingers normally disposed between the main-line-wire strips and connected in a local telephone-circuit, and fingers normally resting on the return-wire strips and included in the local telephone-circuit.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

JOSHUA WALKER GORE.

Vitnesses:

J. H. WILSON MARRIOTT, W. T. PATTERSON.

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