US242156A

US242156A - Chaeles w

Info

Publication number: US242156A
Authority: US
Publication date: 1881-05-31
Anticipated expiration: 1898-05-31

Description

- mammal.

- G. W. RAYMOND.

Telephone.

No. 242,156. Patented May 31,1881.

UNITED STATES PATENT OFFICE.

CHARLES W. RAYMOND, OF NEW YORK, N. Y.

TELEP-HON E.

SPECIFICATION forming part of Letters Patent No. 242,156, dated May 31, 1881.

Application filed January 29, 1881.

To all whom it may concern:

Be it known that 1, CHARLES WARD RAY- MOND, of the city, county, and State of New York, have invented certain Improvements in Telephones, of which the following is a specification.

The invention relates to telephonic transmitters or receivers, electric or mechanical. Heretofore in using an ordinary transmitter or telephone the speaker placed the mouth close to the mouth-piece of the instrument. Thisis objectionable because, first, the moisture due to condensation of the breath collects in the instrument, causingit to rust, thereby impairing its efficiency second, because the odors of the breath are retained in theinstrument and are often extremely offensive to another party using the same; and, third, when articulation is interfered with the instrument fails in its purpose in a corresponding degree.

The object of my invention is to avoid the above-mentioned objections, to increase the durability, utility, and efficiency of the instrument to which it is applied.

The invention consists in a cap covering the mouth ofthe instrument, forming an independent diaphragm not in contact with the diaphragm proper of the instrument, attached in any convenient man ner to the telephonic transmitter or receiver, and in such a manner as not to interfere perceptibly with the transmission of sound. This cap or covering may be made of any suitable material-metal, paper, wood, or rubber, all having been tried and found to work more or less successfully; but this specification relates more especially to the use of rubber, and rubber and paper combined, that form a cap or covering applied to and over themouth-piece of a telephonic transmitter or receiver. A cap of vulcanized sheet-rubber is molded of such size and shape that it may be placed and stretched over the mouth-piece of the instrument and retain its position either by its own elasticity or by other means.

In the drawings, Figure 1 is a plan view; and Fig. 2, a section through a: y, showing the cap over a mouth-piece.

The central portion,A, of the cap, when applied, is stretched and becomes an elastic diaphragm of such a thickness as to not prevent the vibrations of the voice being transmitted by it to the diaphragm proper, t, of the instrument. That portion B B outside the central (No model.)

portion, A, may be made of one or more thicknesses of the same or other material, to better withstand the wear on the corners or edges, and also to act as a binding or elastic band to keep the cap in place and the central portion drawn sufficiently tight. To counteracta slight musical tone which this rubber diaphragm may produce there may be inserted inside and under the cap a disk of paper, h, not too thick, and of a diameter a little less than the diameter of the exterior of the mouth-piece, between which and the diaphragm Ait is held, as shown. The vibrations ot' the voice are transmitted from the rubber diaphragm to the confined air behind it, and thence to the diaphragm proper, t, of the instrument, and vice versa when the device is used as a receiving-instrument. The rubber covers the mouth-piece entirely, and is of such a nature that the breath does not condense as rapidly upon it as upon the metallic diaphragm proper of the instrument, and being more exposed such moisture as is deposited may be easily wiped oh, and in any case rapidly evaporates, instead of remaining, as usual, within the cavity of the instrument.

The device does not impair the effect of the voice in the instrument to any appreciable degree, but even admits of a more delicate ailjustment of the instrument itself, thereby increasing the volume of sound, and by preventing the lips from approaching any closer to the instrument than the face of the cap the voice is rendered less disagreeable, the effect mellowed, and articulation madefreea-nd distinct.

What I claim, and d sire to secure by Letters Patent, is-- l. A telephone in which a supplemental diaphragm covers the mouthpiece, substantially as set forth r 2. Thecombination, in a telephone, of the usual diaphragm at the bottom of the mouthpiece, a diaphragm covering and extending over the mouth-piece, and a. disk, h, beneath the outer diaphragm, substantially as described.

In testimony whereof have signed my name to this specification in the presence of two subscribing witnesses.

OHARLES WARD RAYMOND.

Witnesses H. M. ONEIL, W. A. WILMOT.