US1607338A - Funnel for sound-reproducing apparatus, talking machines, and the like - Google Patents

Description

Nov. 16 1926.

' Y A. H. H. CORELL FUNNEL FOR scum) REPRODUCING APPARATUS, TALKING MACHINES, AND THE LIKE Filed Nov. 6, 1923 Invei cfl'ol' Core Ll/ g 791M 1 G% Patented Nov. 16, 1926.

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AXEL HANS EOLGER CORELL, OF COPENHAGEN, DENMARK.

FUNNEL FOR SOUND-REPRODUCING APPARATUS, TALKING- It-IAGI-IINES, AND LIKE.

Application filed November 6, 1923, Serial No. 673,174, and in Denmark September 18, 1923.

The present invention relates to a funnel for sound-reproducing apparatus, talking machines and the like. The distinguishing feature of the invention is that the funnel is built exclusively of flat plates, preferably of sounding-board wood. The funnel consists of a comparatively long funnel pipe, a short funnel throat and a wide funnel mouth, thesaid i arts being each built up of four flat plates.

Another distinguishing feature of the invention is that the top plate of the funnel throat is placed so as to form an angle of about 140 with the rear wall of the funnel pipe, and that the bottom plate of the funnel-throat forms an angle of about 120 with the front wall of the funnel pipe.

A further distinguishing feature is that the bottom plate of the funnel throat is slightly shorter than the top plate, but the rear wall and side walls of the funnel pipe may be considerably longer than the front wall of the same.

By building the funnel in the above manner, the advantage is attained that sound-re productions, whether of instrumental music, of song or of talk, will be entirely natural and free of all arring sounds that ordinarily disturb the sound reproduction.

One manner of constructing the invention is illustrated by way of example in the drawing, where Fig. 1 shows a vertical section of the funnel, encased, according to the present invention, in a cabinet in which the sound reproducing apparatus is also enclosed.

Fig. 2 a section along line IIII of Fig. 1 and Fig. 3 a front view of the funnel proper.

The sound reproducing apparatus a is provided with a sounding branch 0 and is builtin into a cabinet I). The funnel consists of a comparatively long pipe (Z, a throat g and a mouth h. The pipe (Z the lower end of which is connected to'the free end of the sounding branch 0 is made out of four fiat plates and widens gradually in upward direction towards the throat g. The cross-section of the pipe 03 may most suitably be e forming an angle of about 140 with the rear wall of the funnel pipe, and a bottom plate 7 forming an angle of about 120 with the front wall of the pipe, so that the throat, as shown in Fig. 1, will be slightlywider towards the mouth it of the funnel. The side walls of the throat are formed partly by the side plates of the pipe, upwardly extended and partly by the parts of the side plates of the mouth it adjoining the funnel pipe, the last mentioned-side plates as well as the top and bottom plates of the mouth sloping in such a manner that the mouth flares considerably towards the front.

All of the plates employed for the three members of the funnel are plane and most appropriately built of sounding-board wood.

The sound produced by the sounding box of the sound-reproducing apparatus (4 causes the motionless air in the pipe and in the throat of the funnel to vibrate. These vibrations are transmitted to the walls of the pipe and the throat, the sound being thereby reinforced in similar manner as by the sounding-board of a stringed instrument.

The throat serves principally as a sound reinforcing member, the mutual position and length of the top plate and the bottom plate being of the utmost importance to the fine acoustic properties of the funnel. 7 When a funnel like the present one is used, the sound reproduction will prove complete 1y natural, and the sound will be full, clear and clean. Experiments made with the fun nel according to the present invention have proved that human voices are reproduced with all their individual characteristics, and various musical instruments are reproduced each with its special timbre, and the present funnel oiiiers therefore important advantages in comparison with the funnels hitherto in use for sound reproducing machines, by the use of which funnels the sound he comes harsh, sharp, thin and flat and to a very high extent loses its individuality.

Having thus described my invention, what I claim is A horn for loud reproducing device's, tall;-

ing machines and the like constructed of flat plates of resonant Wood and consisting of a long neck, a relatively short intermediate portion having extended portions and a Wide 1 mouth the side Walls of the intermediate portion being constituted by the upwardly extending lateral portions of the neck and the portions of the lateral Walls of the intermediate portion located above the bottom thereof being constituted by the side Walls of the horn mouth.

In testimony whereof I have aflixed my signature.

AXEL HANS HOLGER CORELL.

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