US430913A - Elizabeth b - Google Patents

Description

(No Model.)

B. B. BELL. TELEPHONE MOUTH PIECE AND HOLDER.

No. 430,913. Patented June 24, 1890.

[WE/V2072 .rltlomzey UNITED STATES PATENT OE IcE.

TELEPHONE MOUTH- PIECE AND HOLDER.

SPECIFICATION forming part of Letters Patent No. 430,913, dated June 24, 1890.

I Application filed November 6, 1889. Serial No. 329,423. (No model.)

To all whom it may concern.-

Be it known thatI, ELIZABETH B. BELL, a citizen of the United States, residing at \Vashington, in the District of Columbia, have invented certain new and useful Improvements in Telephone Mouth-Pieces and Holders 'lherefor; and I do 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, reference being had to the accompanying drawings and to the letters of reference marked thereon, which form a part of this specification.

This invention relates to certain new and useful improvements in mouth-pieces for telephones and in means of attaching them to the telephone.

. It has for its object among others to provide an improved mouth-piece, by the use of which a much better result is obtained, obviating all rumbling sounds which often interfere with ones hearing what is being said by the person at the other end of the line.

It has for a further object to provide a simple, cheap, and eflicient means of readily attaching the mouth-piece in place over the opening in the transmitter.

The novelty resides in the peculiarities of construction, and in the combinations, arrangement, and adaptation of parts, all as more fully hereinafter described, shown in the drawings, and then particularly pointed out in the appended claims.

The invention is clearly illustrated in the '0 accompanying drawings, which, with the letters of reference marked thereon, form a part of this specification, and in which- Figure 1 is a perspective view of a telephone having my improved mouth-piece applied. Fig. 2 is a longitudinal section through the door of the transmitter, mouth-piece, and its holder, all on an enlarged scale. Fig. 3 is a perspective detail of the holder and the inner end of the mouth-piece.

Like letters of reference indicate like parts throughout the several views.

the present invention, being shown merely to show the application of my improvement. The door B of the transmitter is provided with an opening a, surrounded by an annular groove or depression Z).

C is a circular metallic holder, formed of any suitable material,easily formed into shape either by being stamped orin any other suitable manner, and this holder is made of proper shape and size to fit snugly within the groove 1), so as to make a tight fit and prevent the escape of the sound in talking. This holder is formed with a circular base portion 0, from which project in the length of the holder the prongs or pins (Z of any desired nu mber, preferably four, as shown in Fig. 3. These may be an integral part of the holder or made separate and attached thereto by solder or in any otherpreferred manner. From this base portion a there project in the opposite direction the spring-arms 6, formed by slitting the material of which the holder is formed and the outer ends of these spring-arms are rounded outward, as shown in Figs. 2 and 3, so as to more readily admit the mouth-piece hereinafter described. In practice this holder is designed to be applied to the opening in the door by pressing the prongs or pins into the groove therein and forcing the holder hard up against the door so as to make atight joint, and thus prevent the escape of the sound. The pins enter the groove and do not marthe door, the openings they make when forced in being so small as not to be observed even if the holder is removed, which will not often be the case, even if the mouth-piece should be removed, as I propose to make the holders so that they shall be an ornament even ifthe mouth-piece is not employed.

D is the mouthpiece having its smaller end of such size as to fit snugly within the holder, the spring-arms of the holder yielding as the smaller end of the mouth-piece is pressed 5 therein, the outwardly-rounded ends of the spring-arms allowing of the ready insertion of the mouthpiece without injury to the end thereof. The solid base portion 0 of the "holder serves to closely hold the smaller end of the mouthpiece when it is in place, the inside wall of the holder being parallel with the outer wall of the holder and the inner end of the holder finding a bearing on the inner wall of the groove Z), and the double thickness thus provided serves to more effectually prevent the escape of sound at this point.

The mouth-piece may be formed of any suitable material. I propose ordinarily to construct it of either papier-mach or guttapercha and of general bell form, as shown in Figs. 1 and 2that is, with an outwardly-extending curve (1 at its outer end, thence curved inwardly, as at (P. I form it at the outer or month end with a diaphragm D integral with the body of the mouth-piece and extending within the same on the arc of a circle,nearly a semicircle, as shown in Fig. 2, as I have found this form to produce the best results. This inwardly-extending diaphragm is joined directly to the outwardly-extending curve (1 of the mouth-piece, forming, as it were, a sharp spherical angle at their junction, as shown at (1 in lieu of having an intermediate piece of metal rectangular in crosssection, as has heretofore been proposed. Through the center of this diaphragm there is an opening E in line with the opening in the door of the transmitter, as shown in Fig. 2. A mouth-piece constructed in this nian ner will concentrate the sound as the operator speaks into it, and the convexity of the inner face of the diaphragm serves to throw off or outward any rebounding or vibrations that usually tend to produce a rumbling noise and enable one to be heard much more distinctly than otherwise would be the case.

\Vhat I claim as new is 1. As an improved article of manufacture,

a telephone mouth-piece, formed with the month end upon curved lines and with an illwardly-extending diaphragm having a central aperture and joined directly to the outwardly-extending curve of the mouth-piece, forminga sharp spherical angle at their junction, substantially as shown and described.

2. A holder for mouth-pieces,formed of resilientniaterial, havingspringarms and pron gs extending in line with the holder at the end opposite the spring-arms, substantially as shown and described.

3. As an improved article of manufacture, a holder for telephone mouth-pieces, consisting of a solid base portion,from which extend spring-arms in the direction of the length of the holder, and prongs extending from the opposite side of the base portion, the free ends of the spring-arms being outwardly rounded, substantially as shown and dcseribed, and for the purpose specified.

4. The combination, with the doorof a transmitter having a groove around the opening therein, of a holder provided with prongs inserted in the said groove, and a solid base portion from which extend spring-arms, and a mouth-piece having a smaller end adapted to fit within the spring-arms and into the said groove, substantially as shown and described.

In testimony whereof I affix inysignature in presence of two witnesses.

ELIZABETH B. BELL.

\Vitnesses:

L. I. ONEAL, A. R. ALLEN.

Images