US1500008A - Sound reproducer - Google Patents

Description

M 1, 1924. 1,500,008 4 G. W.-$LIGHT SOUND REPRODUCER Filed July 15 1922 IIVI/EIVTOI? G'eor ell/Sk'yk? A TTOR/VEYS July 1, 1924.

Patented --rATEs GEOR'GE W. SLIGHT, OF BRQQKLYN, NEN YQR-K.

$OUND BEPR-ODUGEE.

Application filed July 15,

To all whomit may concern.

Be it known that I, GEORGE W. SLIGHT, a citizen of the United States, and a resident of the city of New York, borough of Brooklyn, in the county of Kings and vSitate of New York, have invented new and useful Improvements in Sound Reproducers, of which the following is a full, clear, and exact description.

This invention relates to sound boxes for recording and reproducing machines.

In the usual construction of sound boxes for reproducing and recording machines, a sound box casing, which is either one piece or two pieces rigidly connected, is provided, and a resilient member is mounted between the sound box and the tone arm so as to eliminate the possibility of rattling and to introduce a certain resiliency in the mounting of the sound box. The diaphragm is mounted in the'rigid casing and the only vibrations transmitted into the tone arm are the vibrations of the diaphragm which take place between the center and the periphery of the diaphragm. The vibration of the diaphragm, which consists of the movement of the diaphragm as a unit, is practically eliminated by the rigid casing and consequently many of the low tones are lost.

The general object of this invention is the provision of a simple and efficient sound box for recording and reproducing machines, adapted for projecting into the tone arm all the vibrations. received by the stylus arm.

This object is accomplished by providing a two-section casing, one section of which is adapted to be attached to the tone arm and the other section adapted to carry the stylus arm, interposing between the sections a'resilient member and attaching the sections to one another so that the section carrying the stylus arm may move relative to the other section This and other objects of the invention will be more clearly understood from the following detailed description and accompanying drawings.

Figure 1 is a side elevation of the sound box;

Figure 2 is a section along the line 22, Figure 1;-

Figure 3 is an exploded view of the sound box as shown in Figure 2;

Figure 4 is a modification of the sound box.

1922. Serial No. 575,241.

Referring to the above-mentioned drawings, a sectional casing 10, consisting of a section provided with means for attaching it to the tone arm and a section 12 to which; the stylus arm 13 is connected, is

shown. A diaphragm 14 is mounted in the Circumferential grooves 19 and 20 are cut in the inner faces of the sections 11 and 12. These grooves are so located that when the sections are attached to one another they are in alinement. A resilient member 21 is interposed between the sections 11 and 12 and mounted in the circumferential grooves 19 and 20. This resilient memberv is usually made from rubber tubing and extends completely around the sections 11 and 12. A plurality of openings 23 extend through the section 11 and register with a plurality of threaded open ings 22 formed in the section 12. Screws 25 constructed with an unthreaded portion 26 and a threaded portion 24 are provided for attaching the sections 11 and 12 together, the threaded portion of the screws 25 engaging in the threaded openings 22 of the section 12. The unthreaded portion 26 of the screws 25 slide in the openings 23 in the section 11. This allows the section 12 to move relative to the section 11.

Referring to the modification shown in Figure 4, the section 11 is shown constructed with a rim 27 while the section 12 is provided with a circumferential groove 28. A resilient member 29 in the form of an annular plate made from some resilient material is mounted in the groove 28. When the sections of the casing are connected together by means of screws 25, the rim 27 engages the resilient member 29. It will be seen from the above description that such a construction will allow the section 12 to move relatively to the section 11.

When diaphragms are working under low tension they reproduce low tones accurately but distort high tones. By putting a strong spring tension on the stylus lever to assist the diaphragm in the reproduction of high tones, the latter are more accurately reproduced. But if the periphery of the dia= phragm is firmly mounted the low tones are slightly distorted. In order to provide for the most desirable reproduction of all tones, the casing 10 is constructed with one movable section and the diaphragm is positioned between two resilient rings. Consequently such a construction of a sound reproducer takes care of the low tones reproduced by slow vibration. Therefore, such a construction provides a reproducer capable of reproducing all the tones that have been recorded on any record. Such a sound reproducer may also be used with a recording machine and the operation is the same. I would state in conclusion that while the illustrated examples constitute practical embodiments of my invention, I do not limit myself strictly to the exact details herein illustrated since manifestly the same can be considerably varied without departing from the spirit of the invention as defined i the ppe d slai I claim:

A. sound box for recording and rep-r0- ducing machines, comprising a two-section casing, said sections having circumferential grooves provided in their inner faces and located in alinement near their periph cries, a stylus arm carried by one section of the casing, means formed on the other section of the casing for connecting it to a tone arm, an annular resilient member mounted in the circumferential grooves between the casing sections, means connecting the sections, a pair of annular resilient members mounted in the casing, and a dia phragm positioned between said annular resilient members.

GEORGE W. smorrr.

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