US1270610A - Radial sound-amplifier. - Google Patents

Description

C. F. W. FORSSBERG.

RADIAL SOUND AMPLIFIER.

APPLICATION FILED JAN.H.19|E.

Patented June 25, 1918.

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A TTORNE') WITNESSES CARL FREDBICK WILLIAM FORSSQERG, OF BROOKLYN, NEW YORK.

RADIAL SOUND-AMPLIFIER.

Specification of Letters Patent. Patented June 25, 1918.

Application filed January 11, 1916. Serial No; 71,474.

T 0 all whom it may concern:

Be it known that (Ann I. lVM. Fonssnnao, a citizen of the ilnitcd States, and resident of Brooklyn, in the county of Kings and State of New York, have inventcd certain new and uscful Improvements in Radial Sound-Amplifiers, of which the following is a spccification.

This invention rclatcs to sound amplifiers in phonographs, and especially to that class wherein the cover of the phonograph serves as a main portion of tho ampliticr.

()nc advantagc of this invention is to provide a phonograph with an aln )lifier which can bc disassembled and stored in a rcccss in the phonograph. rcndcring the wholc apparatus compact and portable.

Anothcr advantage is to providc a phonogmph having a storage space for records between the cover and the turntable.

Further advantages and possibilities will become apparent as the specification procecds.

In the drawing, like numerals refer to the same parts.

Figure 1 is a perspective view of an apparatus embodying the prscnt invention in a normal operative osition. Fig. 2 is a rear view of ampli ying tube 3. Fig. 3 is a side view of Fig. 1 in closed position, with portions of the sidcs removed to expose the interior.

Many who have learned to appreciate phonographs in general have felt the lack of a convenient portable phonograph which would not sacrifice any of its acoustical capacity because of its bcing portable. It is with the cndin view of providing such a portable phonograph which is primarily a perfect and etlicient phonogra h that the present invention is designed. ncidentally a new form of amplifier is included in the invention as will be presently described.

Referring to the'drawing, the casing 8 contains a spring motor which may be wound by the, usual crank noted 13. The cover 2 is supported by hinges 16 and bracket 15 in a vertical operative osition. The am lifying tube 3 is scour to the board 1 by screw heads as at 6 the narrow portions of the apertures 6, 6' 1n the flange 10 being retained thereby, the felt 1 serving to insure noiseless contact between flange 10' and board 1. The tonearm 21,:is pivoted in the annular channel 3 and s provided with the soundbox as shown.

tying tube 3.

a cover provid k If the, motor brake at the left of turntable 13 is released, the latter will revolve and tho apparatus is read to Operate. If a record is than laid on tic turntable and a nccdlc inserted in the needle arm of the soundbox, thc apparatus will project a considcrablc volumc of sound about the board 1 from tho marginal smce 9.

The board 1 is realiy a soundboard,and is provided with a large aperture which is not illustiratcd to match opening 5 of ampli- The soundboard is spaced from tho top of cover 2 by cleats or bobbins as at 7 and is preferably of a regular form. In order to makc the inner edges of the cover conform in spaced manner with the, periphery of soundboard 1, the corners of the covcr havc been fillcd in as at 19 with blocks or strips and then covered with sheet metal or wood.

l/Vhcn the apparatus is in opgration the sound rising up into tubc 3 will be considerably amplified and pass through soundboard 1 and directly impmgc on the to!) of cover 2, and then diverge. radially between said top and the soundboard till it strikes all the sides like 14 of the cover, whence it will issue to the air from space 9. The width of this latter space is uniform and is preferably so designed as to produce a slight back pressure on the sound, destroying the scrcetch of had high notes and making the whole rangc of sound vcry uniiorm.

\Vhen it is desired to disassemble the phonograph, toncarm 21 and tube 3 are removed from their operative position and laid in'either of the storage chambers 17 or 20 in the casing, likewise crank 11, chamber 17 being subdivided and adapted to recei ve the tone-arm in a smaller chamber having a cover 18 to protect the same. Whatever records may have been used are laid on turntable 13 as at 4 and the cover closed. The whole apparatus is thus obviously self contained with all its a purtenances.

As modifications of my invention are possible without departing from its scope, such as maki the soundboard 1 oval round or hexagona or making the angle of sides 14 with the top of the cover greater or less than 90 degrees, I therefore reserve all rights to such modifications.

Having thus fully described my invention, I desire to obtain by Letters Patent,

1. A phonogra h including a casing and with a top and sides, a

soundboard. secured in said cover within said sides and top by means of cleats or bobbins located within the periphery of said soundboard, providing a uniform clearance about and beneath said periphery, there being an aperture through said soundboard Within the edges thereof for projecting sound against the top of said. cover.

2. A phonograph comprising a casing and a cover, a soundboard secured in the cover, uniformly spaced from the top and sides thereof, and a normally rigid amplifying tube secured to said soundboard, there being an aperture in said soundboard providing an inict for projecting sound from said ainplif '19; tube directly against the ib, qih Comprising a casing and a core] a dboard secured in the ccnfer, spa d if in the top and within the sides and additions in the comers of the sides a uniform sound projectin space about the entire periphery of sai soundboard.

4.. A phonograph including a casing and a cover, a soundboard or disk secured in spaced manner within the top of the cover and concentrically therewith, there being an aperture through the center of said soundboard and a uniform marginal space about the soundboard between the periphery there- EARL FREDK ICK WILLIAM FORSSBERG.

Nitnesses ELIAS Jennie-0N, OLAF F. lionsseuno.

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