US1890719A - Horn - Google Patents

Description

Dec. 13, 1932. v. w. Busch 1,890,719

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Filed July 5, 1928 IN VEN TOR wa s; W

A TTORNE Y Patented Dec. 13, 1932 UNITED STATES PATENT OFFICE VERN W. BUSGH, OF SOUTH BEND, INDIANA HORN . Application filed July 5, 1928. Serial No. 290,557.

This invention relates to horns and paris highly polished and it is therefore, very ticularly to the' class in which sound waves desirable to use because friction is reduced are increased or magnified, the principal obto a minimum and the sound waves pass ject being to provide such a horn which is through the amplifier unhindered. This fealight in weight, compact, strong in constructure allows the sound waves to be produced tion, and exceptionally economical to manuwith increased volume and mellowness withfacture. out distortion. Celluloid is a non-metallic Another object is to provide a horn of the material and a horn built of this material will sound amplifying type with a natural highly not emit the harsh metallic sounds which are polished inner surface whereby friction is at so prevalent in some of the other types of I a minimum'so that the sound waves will loud speakers used in the past. Another featravel unhindered and will reproduced ture which is highly desirable is that celluwith increased volume without distortion. loid is not porous and will not be affected by Another object is to provide a horn of the dampness or changes in temperature. Many sound amplifying type in which sound waves of the horns previously built were of plaster will be produced in their original rendering of Paris or other porous material which abwith increased volume and will not be afsorbs moisture on damp days which does not fected by dampness and normal temperature allow musical notes to be produced with melchan es. lowness and fine quality of tone. Celluloid A urther object is to provide a horn of the can be produced in a variety of colors which. T9 sound. amplifying type whichis formed from may match with furniture and the like. An-

celluloid, yralin or similar materials. otherstriking advantage of celluloid is that 'A still fiirther objectis to provide a horn it is very light in weight but is very strong of .the sound amplifying type formed of two and rigid, therefore making the same very celluloid members having convolute grooves desirable to use as it can be carried from place T therein, the members being secured together to placev without any great effort. A further with the grooves in matched relationship to advantage is that by reason of its lightness provide an amplifying passageway. and narrowness, the horn of my inventionis These being among the ob]ects of the presreadily adaptable for use in automobiles ent invention, the same consist of certain feaequipped with radio receiving sets. .5

tures of construction and combinations of In the accompanying drawing which ilparts to be hereinafter described with reflustrates a suitable embodiment of the preserence to the accompanying drawing, and cut invention, then claimed, having the above and other 1 Figure 1 is a side elevation of the comobjects in View. v p pletely assembled horn mounted upon a suit- I This invention isparticularly adaptable to able reproducing unit. that type of horn commonly known as a loud Figure 2 is atransverse section through the speaker to increase or amplify the sounds horn taken on the line 22 of Figure 1. transmitted by a radio'or wireless apparatus, Figure 3 is an elevation of one of the horn although the loud speaker is equally as adaptmembers looking toward the convolute groove. able to produce the sounds produced by a therein showing the outlet opening. talking machine or other instruments ofthis Figure 4 is an elevation of the other horn character. p member looking toward the convolute groove The horn is constructed of sheet celluloid therein. 'or .pyralin which is formed to the desired Figure 5 is an enlarged section taken on shape by a process which is the subject matthe line5-5 of Figure 4 showing the gradual ter of another application. Celluloid has decrease in thickness ofthe horn material at many characteristics which renders the same points farthest away from the parting plane. very suitable for a sound amplifying horn, Referring to the accompanying drawing in one of whichis that the surface of thesame which like numerals refer to like parts throughout the several views, the loud speak-' er or sound amplifier is built up of two sec-' tions 10 and 11, each being formed to shape from a single piece of sheet celluloid or s'imcular groove 12 therein arranged in a spiral form, the same preferably having at least two complete turns. The groove 12 coils inwardly in a counter-clockwise direction and gradually increases in width as the same ap-d proaches' the center of the section 10. The entrance to the groove 12 isat the-endhaving thesmallest width and is enlarged at 13 for a purpose to be described later. Similarly the section 11 is formed to the shape shown in Figure 4 and is provided with a semi-cirfused together,

"cular convolute groove 14 thereinof the same size as thegroove 12 which coils inwardly 1n a clockwise direction and gradually increases in width as the same approaches thecenter 'of the section 11. The entrance to the groove 14 is enlarged at 15 for a purpose to be described later.

The two sections 10 and 11 are secured together by cementing the webs 16 between the turns of the groove 12 to the webs 17 between the spiral turnsof the groove 14. Celluloid 'is capable of being dissolved and for this reason two celluloid parts can be very efficiently and satisfactorily secured together by dis- "solving the surfaces and forcing them into contact with each other. In the present invention, the webs 16 and 17 of the two sections 10 and 11 are coated with acetone or similar substance which causes the surfaces thereof to fuse or dissolve.

are then brought into contact with each other When these surfaces are a under pressure.

a solid unbreakable ]omt is provided which can be compared to a welded joint between two pieces of metal.

When the two sections 10 and 11 are secured together in this manner the grooves 12 and 14 .are in matched relationship and a section thru the same presents a circular passageway 18 arranged in spiral form as shown in Figure 2.

The passageway 18 is of smalldiameter at its outer end which is the sound inlet and gradually increases in diameter up to the outlet 19 which isprovided' for by cutting away a portion of the celluloid comprising the'end of the groove 12 in the section 10. The enlarged entrances 13 and'15 of the grooves 12 and 14 respectively when combined provide a cylindrical opening which receives the'discharge end of a reproducing unit 20. The

reproducing unit 20 is mounted upona base block 21 which also provides support for the sections 10 and 11.

It will be noted in Figure 5 that the celluloidsurrounding the opening gradually decreases in thickness as a chord perpendicular to the plane of separation of the passageway furniture and the like.

These surfaces I 18 increases in length. This-feature increases the quality of the tones produced, since the walls are of greater thickness adjacent the common plane of the convolute curve than at points farthest away from this plane.

It is apparent from the foregoing description that a sound amplifier constructed from cellulose material to the shape shown has many advantages over amplifiers used in the past. I

The features which make the amplifier of the present invention more advantageous than other types are as follows:

Light in weight, making the same portable and light enoughtohang upon a wall without danger of falling; ll

Extremely economical to manufacture as thesame is constructed of only two celluloid sheetsmolded to the proper shape.

Natural extremely smooth passageway surface which reduces friction to a minimum thereby reproducing tones in their original rendering. V

Gradual dec'reasein thickness of thepassageway walls as the chord perpendicular to the convolute plane increases in length, which improves tone qualities. I a

. Extremely compact thereby requiring small mounting space but with an exceedingly long passageway for its size- Adapted to be produced in colors to match Not affected by dampness and normal temperature qualities thereby giving perfect amplification at all times. 7

It is to be understood that formal changes may be made in the specific embodiment of the invention described without departing from the spirit and substance of the broad invention,the scope of which is commensurate with the appended claims.

What I claim is 1. A sound'amplifying device constructed of celluloid-like material, having a sound amplifying passageway therein of convolute form gradually increased in area from the inlet'to the outlet thereof, the walls of said passageway being decreased in thickness as the chord perpendicular to the convolute plane is increased in length. I p

2. A sound amplifying device comprising two members of celluloid-like material secured together, each of said members being formed from a single sheet of celluloid-like material, and a' continuous sound amplifying passageway between said members, one of said members'having'an outlet opening for said passageway.

3. A sound amplifying device comprising two members of celluloid-like material securedtogether having semi-circular grooves therein arranged in convolute form in matching oppositely-disposed relationship to each other to provide a circular sound amplifying passageway, an inlet for said passageway,

and an outlet for said passageway in one of said members adjacent the central axis of said device, said passageway being gradually increased in area from said inlet to said outlet.

4. A sound amplifying device comprising two members of celluloid-like material secured together having semi-circular grooves therein arranged in convolute form in matchin oppositely-disposed relationship to each ot er to provide a circular sound amplifying passageway of increasing area from the inlet to the outlet thereof, and sound reproducing mechanism for said inlet, said outlet for said passageway being formed in one of said members.

5. A sound amplifying device comprising two members of celluloid-like material, each having a continuous convolute groove semicircular in section and of gradually decreasing radius, said members being secured to gether with their grooves presented toward each other, thereby forming a convolute smooth-walled passageway of gradually increasing diameter from the inlet to the outlet for the transmission and amplification of sound waves.

Signed by me at South Bend this 30th day of June, 1928.

VERN W. BUSCH.

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