US1279438A - Sound-amplifier. - Google Patents

Description

T. H'. REED. I

SOUND AMPLIFIER.

APPLICATION HLED DEC.'30.1915.

'1,,z'z'9 438. Patented Sept. 17,1918.

I W/T/VESSES: MENTOR THOMAS H. REED, E NEWARK, NEW' JERSEY,

SOUND-AMPLIFIER.

Application filed December 30, 1915. Serial N 0. 69,352.

To all whom it may concern;

Be it known that I, THOMAS II-ERBERT' REED, of NewarlnNew Jersey, have invented certain new and useful Improvementsin Sound-Amplifiers, of which the following is a specification. Tl11S 1nvent1on relates to sound amplifiers,

and it comprises a hollow member circular in crosssection throughout a portion of its length and of a different cross section throughout the remainder of its length, such construction resulting in an amplifier having one side provided with a continuous and unobstructed passage for the sound waves and another side provided with a changed passage arranged to alter the volume of the sound waves and operating to modulate the sounds.

The invention further comprises an amplifier consisting of a plurality of different metals, one portion of the amplifier forming a continuous and unobstructed passage for the sound waves and the other portion forming a changed passage for decreasing the volume of the sound waves, the amplifier advantageously being in communication with a tube or tone arm of different metal.

In the accompanying drawings, I have shown a specific embodiment of my invention, similar reference numerals indicating corresponding parts in the several views.

Figure 1 is an elevation of the sound amplifier;

Fig. 2 is a view looking into the outlet end of the amplifier illustrating the relation of the two sections with respect .to each other;

Flg. 3 is an elevation showing the manner of connecting the amplifier to the tone arm.

In these drawings, 1 indicates-the outer section of the amplifier advantageously made of sheet iron and being oval in cross section. but in the form of a truncated cone. The inner section 2. advantageously made of polished brass is circular in cross section and is attachedto section 1 by means of a joint shown at 4 in Figs. 1 and 8, solder preferably being used. The inner end of the outer section 1 preferably overlaps the outer end of the inner section 2.

The outer sectionl consists of a long side 1116 and a short side 19'15, the long side forming in connection with the adjacent section 2 a continuous straight line from the outer end of the. inner section 2 to other direction.

the point 16 at the outlet end of the amplifier. The shortside 1915 flares outwardly at an angle at point 19, the result is that in the upper section of the amplifier there is a straight continuous passage for the sound waves-while at the lower end there is I a changed passage which effects a modulation of the sound. 7

A two-part elbow 9 and 10 soldered together is connected to the small end of section 2 and a preferably zinc tube 3 is conneeted to this elbow 9. The tube 3 is fitted to a socket 5 of the tone arm 6.

The long side 'of the amplifier from the point 16 to the elbow 9 produces a straight line and combines an unobstructed passage which will be followed by the sound waves transmitted from the tone arm. 7

The soundwaves which travel along the short side of the amplifier will be changed atthe point 19 by the outward flaring portion of section 1. This will cause the vol ume of the waves to be decreased, and as the distance between the joint 11 and the point 16 is greater than the distance be tween the point 15 and 19, a full modulation of the tone takes place on the shorter side of the amplifier and a full Volume of the tone is delivered along the long side of the amplifier.

The two sections 1 and 2 areof different metal and the tube 3 is preferably of a dif-,

'ferent metal from either of the sections.

The joints are preferably made by overlapping the metal rather than by contacting the two edges, and in this manner I eliminate' all metallic rings or hollow sounds, and I also do away with any gutteral or muffled tone which is prevalent in the usual amplifier. The parts are so constructed and arranged as to amplify and deliver in different degrees of volume at the same time and through the tone opening or outlet a full strength volume in one direction and a comparatively modulated volume in the lVhen the amplifier is mounted in a'cabinet the elbow 9 will be located in or near the corner and the ampli- I fier will stand diagonally across the cabi net with the outlet end flush with the front of the cabinet or with the front opening of the cabinet.

What I claim is v 1. In a sound amplifien the combination with a hollow member consisting of'two Specif cationof Letters Patent. Patented Sept. 17, 1918. I

sections of difierent metals, said hollow member progressively increasing in cross sectional area.

2. In a. sound amplifier, the combination witlr a hollow member consisting of two sect-ions of different metals, said hollow member progressively increasing in cross sectional area, and a sound conduit of astill different metal fitted to the smaller end of the hollow member.

3. In a sound amplifier, the combination with a hollow member consisting of a circular and an oval section, said sections being joined so that the wall at one side of the largest diameter of the oval is continuous, the wall of said oral section at the other end of its largest diameter joining said circular section at an angle thereby forming achanged passage, the length of the changed passage being less than that of the continuous passage.

In testimony whereof, I have signed this specification in the presence of two subscribing witnesses.

THOMAS H. REED. VVit-nesses J05. H. KELLER, J12, FREDERICK REYNOLDS.

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