US231932A - Telephonic signaling apparatus - Google Patents

Description

(No Mo de l.)

0. RAYMOND, 2nd. Telephonio Signaling Apparatus.

- No. 231,932. Patented Sept. 7 18 80.

N.PETERS, PHOTO-LITHOGRAPHER, W..SHINGTON. DJJ.

i M I UNITED STATES PATENT OFFICEQ CYRUS RAYMOND, 2D, OF DANBURY, CONNECTICUT.

TELEPHONIC SIGNALING APPARATUS.

SPECIFICATION formingpart of Letters Patent No. 231,932, dated September '7, 1880,

Application filed March 27, 1880. (No model.)

To all whom it may concern:

Beit known that I, CYRUS RAYMOND, 2d, of Danbury, in the county of Fairtleld and State of Connecticut, have invented a new Improvement in Telephone Signaling Apparatus; and I do hereby declare the following, when taken in connection with the accompanying drawings and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this specification, and represent, in

Figure l, a side view of the telephone with improvementapplied; Fig. 2, a transverse section, showing the invention.

This invention relates to an improvement in telephone signaling apparatus, the object being to arrange the calling apparatus on the telephone itself, so that one telephone on a circuit of several telephones may call and communicate with either of the telephones on the same circuit without necessarily signaling the central office; and the invention consists in the construction, as hereinafter described, and particularly recited in the claim.

A represents a common telephone; B, the ground-wire, attached in the usual manner. ()n the barrel of the telephone are arranged two keys, C D, hung upon a common pivot, to.

d is a metal stud, to which the line-wire E, running in one direction, is attached, so that one end of the key C is held in contact with the said metal stud (l by means of a spring, 0, or otherwise. fis a second metal stud, to which theline-wireF, running in oppositedirection, is attached,so that the end of the key 1) will rest A on the said stud, held there by its spring h, the

two studs (1 f standing on a non conducting material, 1, so that when the two keys rest upon their respective studs the communication is from one of the line-wires through the two keys to the other line-wire so that the circuit is complete through the said keys.

L is a metal plate lying under the heel of both keys upon a non-conductor, n, so that either key may be pressed down into connection with the metal plate L. From this plate L a wire, N, leads to the other pole of the magnet of the telephone in the usual manner for attaching the-line-wire. I

, Now, supposing the person at the telephone desires to call another telephone-say on the line E--he presses down the key C, which breaks the circuit, and the number of breaks indicates the telephone required in the usual manner. Receiving an answer, he then presses down the key D into contact with the plate L, cutting off that portion of the line F beyond, and making a connection through the line E, key 0, to the key D, thence through the connection of the keyD with the plate L, through the wire N, to the telephone, in the usual manner, and holds the key D in this condition while communicating. This practically stops the circuit at this telephone and cuts off all in the opposite direction. When communication is completed release the key D, and it again establishes the circuit through the entire line.

If the communication be desired in the opposite direction, then the operation of the two keys C D will be reversed.

One of the keys may be used for signaling the main office in one direction on the line or any intermediate telephone, and the other for those in opposite direction.

I claim The combination of a telephone with the two keys C I), one held in connection with theline in one direction and the other with the line in the opposite direction, and the two keys connected, so that the complete circuit is through said two keys, and the plate [1, in connection with the telephone, and arranged so that either of said keys C D may be brought into connection with said plate, and thereby place the telephone in circuit, substantially as described. 3

CYRUS RAYMOND, 2D.

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