US631271A - Telephone. - Google Patents

Description

No.63I,27|. Patented Aug. 22, I899.

J. 11. BLACK.

TELEPHONE.

(Application filed Mar. 4, 1898. (No Model.) V 2 Shaets-Sheet I,

No. s3|,27|. Patented Aug. 22, I899.

.1. u. BLACK.

TELEPHONE.

(Apphcanon filed Mar. 4, 1893.) No Model. 2 Sheets-Sheet 2.

UNITED STATES PATENT OFFICE.

JOHN Q. BLACK, OF LONE ROCK, IVISCONSIN.

TELEPHONE.

SPECIFICATION forming part of Letters Patent No. 631,271, dated August 22, 1899.

Application filed Marcli 4, 1898- Serial No. 672,485. (No model.) I

To all whom, it may concern:

Be it known that I, JOHN Q. BLACK, of Lone Rock, in the county of Richland and State of Wisconsin, have invented a new and useful Improvement in Telephones, of which the following is a description, reference being had to the accompanying drawings, which are a part of this specification.

The object of my invention is to provide means in a telephone system whereby the sound transmitted by theimproved telephone and delivered to the ear of the listener thereto is made much louder and more distinct than it otherwise would be.

The invention consists otthe device and combination of devices as hereinafter described and claimed or their equivalents.

In the drawings, Figure l is a fragmentary diagram of a telephone system, showing especially so much of the devices and mechanism at one station as are necessary to illustrate my improvement, which is shown in connection therewith. Fig. 2 is a detail of the construction at the inneror binding post end of a telephone-receiver having my device attached thereto. Fig. 3 is ageneral diagram of that portionof a telephone system that is employed at one station thereof with my improvement therewith.

In the drawings, A and A represent the apparatus at two stations, at a greater or less distance apart, of a telephone system.

B is the line-wire connecting the apparatus at the two telephone stations or boxes.

0 is the ground-wire, the equivalent of the return-wire in a closed system.

D is the transmitter, suitably connected to the telephone system.

E is the receiver, commonly connected to the telephone system by an auxiliary line-wire F and by an auxiliary ground-wire G. A cord X, attached to the receiver and secured to the telephone-case, holds the receiver flexibly to the case and prevents undue strain on the electric conducting-wires. The groundwire G is continued through the wire G to the secondary coil S, and from this coilan auxiliary wire 0 leads to the groundwire C. A battery J is connected by a wire 0 to the transmitter D and by the wire 0' to the primary induction-coil P. A wire It leads from the primary coil back to the battery J. The alarm-bells T T, the alarm-actuating crank U, and the circuit-closing lever V need not be specifically described, as they are common in telephone systems and are not directly involved in my invention.

To the foregoing-described apparatus as heretofore constructed I apply a short-circuit 'or shunting wire H, which is in contact with and bound to the ground-wire C at I or at some other convenient point on the distant side of the telephone-battery induction-coils and alarm devices at the telephone-station and running therefrom to the inner end of the receiver E, at which point it is supported by a post K, fixed on the end of the receiver. This shunting-wire H, at the post K, connects electrically with the metal key L, having a terminal finger-piece. This key L is mounted in the post K and extends therefrom near to the auxiliary ground-wire G, adjacent to its support in a post M, fixed on the endof the receiver E. The key L is elastic and is adapted by pressure of the finger of the user of the telephone to be pressed against the wire G at the point of its nearest approach thereto, (indicated in Fig. 2 at M.) The user of the telephone when receiving a message over the telephone and having the receiver E at his ear presses the key L against the wire G, thereby making a short circuit from the receiver to the groundwire 0 at the other side of the adjacent battery, coils, and alarm device, and thereby short-circuits or shunts the electric route, cutting out the secondary-coil S normally in the circuit, the result being to considerably increase or intensify thesound of the message being delivered to or received by himfrom a distant transmitter. It will be understood that this cutting out of the inductioncoils and the battery at the receiving-station on the line during the receiving of a message over the line does not cut out or reduce the energy of the battery and induction-coils present at the other or transmitting station, but instead puts the line in condition to get the most direct circuit and efficient service from the battery andinduction-coils at the distant vstation, while the non-assisting and resisting energy of the longer circuit through the in duction-coils at the receiving-station is cut out and obviated. When it is desired to transmit a message from this receiving-station through the transmitter D to a distant station, the key L must be released from con tact with the wire G, so as to put the induction-coils and battery at this transmittingstation into the circuit, or otherwise transmittal would be impossible.

It is well known that in telephone systems the electric circuit is in some cases made C0111- pletely by a return-wire serving to complete a metallic circuit and that in other cases a wire connecting the line-wire at its respective ends to the ground is employed, and thereby utilizing the ground to complete the electric circuit as a return-conductor and as the practical equivalent of the return-wire or complete metal electric circuit. I have shown a ground-wire O, desiring that it be considered as a means of completing the electrical circuit by way of the ground and as the equivalent as an electrical conductor of a metal return-wire, which is not shown.

What I claim as my invention is In a telephone, the combination with alinewire, a receiver connected directly to the linewire and a ground-wire leading away from the rear end of the receiver through induction-coils, of a shunt-wire leading from the rear end of the receiver to the ground-wire at a point beyond theinduction-coils, and an elastic metal key on the receiver at its rear end in contact with the line-wire but normally out of contact with other Wires the key being adapted by the pressure of the finger of the holder of the receiver thereon to be moved into contact temporarily with the shunt-wire thereby closing the shunting-cil cuit.

In testimony whereof I afiix my signature in presence of two witnesses.

JOHN Q. BLACK.

Witnesses:

O. T. BENEDICT, A. L. MoRsELL.

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