US722021A - Telephone-transmitter. - Google Patents

Description

No. 722,021. PATENTED MAR. a, 1903 0. HOLMOK. TELEPHONE TRANSMITTER. APPLICATION FILED FEB. 21, 1902.

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CHARLES HOLMOK, OF CLEVELAND, OHIO, ASSIGNOR OF ONE-HALF TO WVALTHER KROELLING, OF CLEVELAND, OHIO.

TELEPHONE-TRANSMITTER.

SPECIFICATION forming part of Letters Patent No. 722,021, dated March 3, 1903.

Application filed February 21,1902. Serial No. 95,060. (No model.)

To aZZ whom, it may concern:

Be it known that 1, CHARLES HoLMoK, a citizen of Austria-Hungary, residing at Cleveland, in the county of Ouyahoga and State of Ohio, have invented certain new and useful Improvements in Telephone-Transmitters, of which the following is a specification, reference being had therein to the accompanying drawings.

My invention relates to telephone-transmitters; and its object is to produce an instrument of this class which shall be extremely sensitive to sound, while it is at the same time simple and inexpensive.

A further object is to provide means for readily adjusting the parts, so that the same instrument can be adapted to various conditions and to the different requirements of local and long-distance service.

The invention consists in a certain construction and combination of parts tobe more fully described hereinafter and definitely set forth in the claims.

In the drawings, which fully illustrate my invention, Figure l is a vertical section through a transmitter embodying my invention, showing a standard in connection with the same, broken away, as indicated. Fig. 2 is a rear view of the front plate of the trans- .mitter, showing parts connected therewith;

and Fig. 3 is a front elevation of the head of the standard.

Referring to the parts by letter, A represents the front case, which is of usual form, provided, as shown, with a forwardly-projecting boss a, having a bore in which is mounted the usual mouthpiece B.

A circular diaphragm O, the margin 0 of which is enveloped between the folds of a rubber ring D for the purpose of insulating it, is maintainedin position by a clip E, which is fastened to the inner side of the case A by means of the small screw a, and a damper F, the tip f of which is covered with the rubber f, is secured to the case A in a similar manner with the screw a At the center of this diaphragm and on its inner side, as shown,is mounted a button 0, preferably made of carbon. This button is connected to the diaphragm C by means of the small screw 0',

which passes through the same and also constitutes a terminal for the line-Wire W, which attaches to it, as indicated. This button 0 is cylindrical at its base, and its tip c is preferably hemispherical, as indicated. Proceeding now to a description of the other e1ectrode, it will appear that within the interior of the front case A a bracket G is fastened by means ofthe screws 9 g, which bracket has downwardly-projecting arms 9 near the extremities of which are mounted the horizontal ad justing-screws 9 These screws are provided with conical tips 9 which are received by the recesses h of the ring H, which will be more fully referred to hereinafter. One of these screws is provided with a milled head g for a purpose that will appear later.

Referring now to the ring H, it is preferably made of brass and of substantially the construction shown. The opening through it is filled by a thick disk It, preferably made of carbon, and this disk h is itself provided with an inclined bore 72 Within this bore is carried a ball K, preferably of carbon, which is gently pressed by its own weight against the tip 0 of the aforesaid button 0, wherefore an extremely sensitive contact is made. By adjusting the ring H into inclined positions the carbon ball K can be made to press with greater or less force, as desired, against the button a, and the milled head g of the aforesaid. screw g affords means for making such an adjustment with facility. In this manner the transmitter may be adjusted to various requirements or purposes.

The wire W from the line can be secured to the aforesaid bracket G in a suitable manner by means of the binding-nut g joining the wire W in the insulated cable W, which passes out through an opening 1 in the rear case L.

The rear caseL is of common construction except that at its rear it is provided with a plate 1, rigidly secured to it by the small screws Z in which plate is fastened a stud Z The outer extremity of this stud is threaded, as shown at Z where it is mounted in the wall of a cylindrical sleeve R, passing first through a short circumferential slot 3, provided in the head 8 of the standard S. This head .9 is preferably split, as at 8 and provided with clamping-screws 8 as indicated. The stud Z substantially fills the width of the slot, wherefore the transmitter may be inclined up or down to adjust the mouthpiece as desired. The cable enters the standard just above the base .9 and passes thence through an opening r into the sleeve R, whence it passes to the transmitter, making the connections described.

Behind the ball K a small quantity of raw cotton P or similar material is inserted in the bore 71. to act as a buffer or backing for the ball. This backing, however, should not exert any material pressure upon the ball when in its position of rest and serves simply to guard the ball against too violent or too greatadisplacement. In Fig. 2 this backing has been omitted, as also have some other parts, for the sake of clearness.

What I claim is- 1. In a transmitter, in combination, a diaphragm, a metallic ring mounted adjacent thereto, a carbon disk carried within said ring and having an inclined bore, a ball carried within said inclined bore, and resting against said diaphragm, and means for adjusting said ring, substantially as set forth.

for adjusting said ring in different positions, substantially as set forth.

3. In a transmitter, in combination, an insulated diaphragm, a button carried on the inner side thereof and constituting an electrode, a carbon disk, a ring supporting the same, said disk having an inclined bore, a carbon ball carried within said bore and resting against the tip of said button, screws adapted to support said ring substantially in the plane of said button, said screws affording means for adjusting the inclination of said bore, substantially as set forth.

4. In a telephone-transmitter, in combination, a diaphragm, a button carried on the inner side thereof and constituting an electrode, a member adjacent thereto and having a bore, a carbon ball carried within said bore, a backing of soft material within said bore behind said ball, said member being rotatable about an axis, and means for adjusting said member about said axis, substantially as set forth.

5. In a transmitter, in combination, a front case, a diaphragm carried therein, a bracket having arms, axially-alining screws mounted in said arms, a metallic ring supported between the points of said screws, a carbon disk mounted in said ring, and having an inclined bore, and a carbon ball carried within said bore and adapted to rest against said diaphragm, substantially as set forth.

In testimony whereof I affix my signature in presence of two Witnesses.

CHARLES HOLMOK.

Witnesses:

F. D. AMMEN, W. KROELLING.

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