US1283007A - Amplifier for talking-machines. - Google Patents

Description

J. WOLFF. AMPLIFIER FOR muum; MACHINES.

APPLICATION FIL ED MAY 5, HHS, 1,283,007. Patented Oct. 29, 1918. Fig.6 1-

UNITED sTATs- Para:

OFFICE.

JOSEPH WOLFE, OF BROOKLYN, NEW YORK, ASSIGNOR TO SONORA PHONOGRAPH CORPORATION, A CORPORATION OF NEW YORK.

AMPLIFIER FOR TALKING-MACHINES.

Specification of Letters Patent.

Patented oct. 2a, 1918.

Application filed May 15, 1918. Serial No. 97,673.

'1 b all whom it may concern:

Be it lmown that I, JOSEPH vVonrr, a subject of the King of Great Britain and Ireland, and a resident of the borough of Brooklyn, in the county of Kings, State of New York, have invented a certain new and use ful Amplifier for Talking-Machines, of

nism.

My invention is not limited to such type of machine, but may also be applied to other forms.

The object of my invention is to produce an amplifier, by means of which the purity and sweetness of the reproduced sound will be increased, and the reproduced sound will be-a true reproduction of the sound as recorded.

. Another object of my invention is to provide improvements in a sound amplifying device for recording or reproducing sound, by means'ofwhich the quality and naturalness of the sounds are recorded or reproduced with greater faithfulness and a more true reproduction of the original.

Another object of my invention is to increase the value of tone reproduction by the means hereinafter described in the specification, or disclosed in the drawings.

These and further objects will more fully appear in the following specification and accompanying drawings, considered together or separately.

My invention is illustrated in the accompanying drawings, and described in the specification, in which corresponding parts in all the figures are designated by similar reference characters.

In the drawings, Figure 1 is a rear elevation of a wooden horn provided with my invention;

Fig. 2 is aside elevation of the same;

Fig. 3 is a side elevation showing a modification; r

Figs. 4 and 5 are views similar to Figs. 1 and 2, but showing a further modlfication;

Figs. 6 and 7 are similar views of a still further modification.

Fig. 8 is a fragmentary rear elevation showing a still further modification.

In the drawing I have shown a-horn having a bell outlet end 1, a body portion 2, and a restricted elbow portion The extremity at of the elbow portion is adapted to cooperate with the enlarged end of a tone-arm (not shown).

The sound waves set up by the vibrations of a diaphragm carried on the smaller end of the tone arm are projected horizontally through the body of the tone-arm and then projected vertically downward by an elbow in said tone-arm, as is common. The sound: waves will strike the back of the elbow 3 of the horn and be deflected forward through the body 2 and out of the bell 1.

When the sound-waves strike the elbow 3, considerable vibration is set up in that portion of the horn, and such vibrations give off sounds which mingle with the sound issuing from the bell, and tend to impair the purity of the reproduction.

On the outside of the back of the elbow of the horn, I place a reinforcement to "3 rent in a great measure or entirely, tions of that portion of the horn.

In Figs. 1. and 2, I show the reinfrnscement in the form of a solid block 5 Wi'iiGll extends across the elbow, and is thickest at the point of greatest impact of the soundwave on the elbow and tapers both ways from the center longitudinally of the horn.

Fig. .8 illustrates the reinforcement in theform of a bow 6, which is attached to the horn at the extremities of the bow.

ln'Figs. a and 5, the reinforcement shown as of the same shape. in side elevation, as that shown in Figs. 1 and 2, but is in theform of a rib 7 along the center line of the elbow. The rib 7 is shown as extendin with gradually diminishing height from the back to the front of the horn. A rib 7 extends alo 1i p; the top of the horn from the elbow to the bell, and a rib 7 on either side 7 from the tone-arm, as shown by the broken. line a, Fig. 2, and are then projected for- I ward as shown by the broken line 7 The point of greatest impact is where the lines e and 7) meet, and, in horns of ordinary construction, the vibrations of that part of the horn can loe plainly felt.

my invention the vibrations at the point of impact are largely or entirely eliminated, and the sound-waves set up by the vibrations of the diaphragm are projected from the bell end of the horn.

In the embodiment of the invention illustrated, I have shown a horn composed of wood or other fibrous material, and the preferred form of horn is shown in my copending application for patent filed September 1, 1915, Serial Number 8,492, but I desire to have it understood that my invention is not limited to horns of the character described. but may be applied to any other form of horn.

in 6, 7, and 8, I have shown the truss embers as composed of wood, but I desire not to limit myseli to the use of such material.

lln accordance with the provisions of the patent statute, i have described the principle oi my invention together with the apparatus which 1 now consider to represent the best embodiment thereof, but I desire to have it understood that the apparatus shown s moi illustrative and that the invention can be carried out in other ways.

- therein for cl'ianging the direction of sound waves projected through the horn, a sup- Y plementai member secured to the back of the 1 ,esaom' bend, said member having considerable thickness at the point at which the direction or" the sound waves is changed and tapering to the vanishing point in the direction of the travel of the sound waves.

2. A talking machine horn having a bend therein for changing the direction of sound waves projected through the horn, a plurality of supplemental members secured to the outside of the horn at the bend, each member being disposed. opposite another member, said members having considerable thickness at the point at which the direction of the sound waves is changed and tapering to the vanishing point in the direction of the travel of the sound waves.

3. A talking machine horn having a bend therein for changing the direction of sound waves projected through the horn, a plurality of supplemental members secured to the outside of the horn at the bend, each n'iember being disposed opposite another member, said members having considerable thickness at the point at which the direction of the sound waves is changed and tapering to the vanishing point in the direction of the travel of the sound waves, each element being formed of a truss element and stay elements, the stay elements connecting the truss element to the horn at a distance from the truss element.

This specification signed and witi'lessed this 20th day of April, 1916.

' JOSEPH VVOLFF. i l 'itnesses WM. CAREN, MARTIN A, Keenan.

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