US1599400A - Sound amplifier - Google Patents

Description

BES? AVML'BLE COPE Sept. 14 1926.

G. L. BAILEY SOUND AMPLIFIER 'Filed 'Dec. 27. 1924 @5M/wld? Y mme@ INV; i3. f MUORNEY Patented Sept. 14, 1926.

UNITED STATES PATENT OFFICE.

GABBOLD L. BAILEY, F NEWARK, NEW ERSEY.

SOUND AMPLIFIER.

Application led December 27, 1924. Serial No. 758,325.

This invention relates to devices for enhncing efr increasing the volume of sound emanations. rendering audition more satisfactory, such devices being variously termed sound amplifiers, loud speakers, resonators,

horns, etcetera..

One of the features of the present invention is in the provision of an amplifier made wholly of wood, because of its resonant properties, shaped in a novel and attractive form and so arranged internally that niicrophonic sound waves are propagated ,i and eventually diffused with greatly increased resonance duc to the sympathetic vibrations cf the structure.

Another object is to provide an amplifier in which the sound waves as received from their source, are direct-ly through a channel of constantly increasing cross sectional area to a point Where they become separated into equal parts, each passing through chambers having rcsonating walls, to become combined into a perfectly synchronized union prior to their eduction into the atmosphere with/ unusual sonorance and clarity.

These several aims and objects are accomplished by .the novel construction and arrangement of parts hereinafter described and shown in the accompanying drawing,

forming a 'material part of this disclosure, and in Which:-

, Figure 1 is a perspective 'view of an einbodiment of the invention,looking from its face.

Figure 2 is a front elevational'view of the ,apparatus with the face or' front wall removed.` f

Figure 3 isya vertical sectional'view taken on line 344,3 tif-Fig. 2.

Figure 4 is 'a transverse sectional view, taken in different planes ers-indicated by the linea- 4 of Fig. 2.

lStated in general terms theapparatus consists of a hollow, drum-shaped body, mounted on a base containing the microhone, to which electrical'connections lead rom the sound source.

Except for the metallic microphone socket and a gauze-like labric prevent entrance of'dust and insectsvvv through the sound issuing openings at t-liev front, all parts of the device are .constructed entirely of wood, the casing or body walls and partitions being preferably made of hardwood veneer, shaped as shown and held in placeA by strong cement.

Referring more in detail to the drawing, the numeral 10 designates in general a base. having a ilat rectangular lower surface, parallel front and rear sides and ornamentally profiled' ends which slope symmetrically to its concave upper surface 11.

A cylindrical band 12, of uniform Width and thickness is fixed on the curved seat 11 and provided with an imperforate disc 13,

of corresponding diameter, at its back, a similar disc 14 being secured at the front, this front or cover disc having a generally ovoidal opening 15 in its lower portion, its bottom edge being substantially concentric with the adjacent periphery of the disc, This opening is for the emission of sound and is partially filled with ornamental fretworrlr 16 of such fanciful design as may be preferred. 4

A lining7 not shown, of .any open meshed fabric may be applied to the inner side of the disc to prevent the entry of insects, dirt. and the like, as will be readily understood.A

An open recess 17 is formed centrally in so the bottoni of the base 10 to receive a microphone, indicated at 18 in broken lines, the same beingr secured in a socket 19 extending from the recess 17 through the wall of the band 12 and an opening 20 in the rear 85 wall of the base admits the passage of conductors leading from the source of supply of sound tothe microphone.

A tube 21, in the form of a reversed truncated pyramid, is arranged centrally within the band 12, its smaller, open end. enveloping the inner extending end of the. socket 19, and its larger, upper end, expanded to till the space between the discs 13 and'- 14, extends to a definite spaced distance from the inner surface of the ring 12, at a' point' diametrically opposite the base, this distance being approximately' equal to onehalf the width .of the tube end.

A substantial] triangular abutment 22,100

having two nniormly curved sides blending into the band 12, to which itis Secured esst Avait/iste com rg moonen transversely at'the top, presentsuits acute y. edge'drectly over the open en d of the tube 2l at its center.

*Accurately curved thin partitions Q3 exvili'tend between the discs ifinnd il. these partitions joining the upper edge of 'the tube 2l to extend downwardly lslightlj,v below its center, essentially constituting a circle. their lower ends being in contact with blocks '2l filling the space between the walls of the tube 21 and respective front und rear discs, but capable of vibrating and excluding 'Sie sound waves from the spaces enclosed by them, causing the sound wares to brauch oppcsitely.

A pair of opposed concm'ely curved lille? blocks 26, connected with the sides oif the vtubefujrl, extend outwardly along the rear [disc 13, from the ring elements 23 to the a band 12, to direct the sound waves outwdrdly through the opening l5, behind which j they are located, and a central vertical strip 27 between the front of the tube and disc "/14 completes the separation ot sound. 25 It is to be noted that the angular edge of the element 22 is arranged to bisect the tube 21, and its curved portions are' so located with Areferences tothe lateral edges vof the tube, at their juncture with thepartitions 23, as to present e/er increasing spaces for the sound waves over the halt' of the sectional area .of the larger end of the tube 21, the increment of passage increase being more rapidly progressive between thewalls 23 and .l2 to the outlet l5.

In operation, sound waves from a micro phone held in the socket 19 passing upwardly through the tube 2l are deflected by l the triangular element 22 to travel equally 40 but on opposite sides, between the elements 23 and bandl2, eventually to be directed outwardly, by the blocks 26, through the opening l5, and it will be noticed that the y, sound passages are constantly increasing in .45 sectional area from the socliet 19 to the opening 15,*-while all corners or bends are so curved'or tilleted as to facilitate such travel. Aga-in reverting to the exclusive use of Wood, with .its known results and taking into .consideration the peculiar characteristics of construction described, it will be seen that a 'structure' has been'disclosv ,f fulfilling the several purposes mentioned. Although Ihave' described my improvements with'considerable detail and with re spect to certain particular forms otA my invention, 'I do not desire to be limited to such details since many cl'ianges and modicutions may well bc inadewithoutdepart- #0 ing from the. spirit and scope of inyinvention ily-its broadest aspect. .y

Having thus described my invention, what I claim as new and desire to secure by Letters' Patent, is

$5 LAfeound amplifier comprisinga base, a

capable of hollow'drum shaped casingseated on the base,' suidcusing havingy openings on its iront wall, a socket in said' base receptive of a microphone. a'hollowtruncated pyramid fixed in said drum with its smaller end 79 open to said socket audits larger endA di- -rccteil upwardly in, direct couuuuuication with -the chamber in thecasing, means in said casing to divert sound waves from the" pyrniuid in two substantially equal sections, partitions in the casing to produce passages of constantly increasing cross sectional area, und means at the ends of said passages to expel the sound waves through the openings in the face ot saidicasing. 8 2. A sound amplifier comprising a base, a hollow drum shaped casing seated on the ous-e, a socket in said base receptive of a microphone', a tapered tube having its smaller terminal enclosing the end of Said socket and extending vertically towards the. periphery of the casing to a point substantially equal to half the width of the larger end of the tube, a deector fixed on 'the interior, peripheral wall of the casing centrallyabove thev tube, a substantially circular partition enclosing the upper portion of saidtuber tween the side walls of 4the casing, and deilectors arrangedy on the rearwall of said', casing between the circular qpartition'and '95l lower peripheral wall of the casing, the outer side wallo the casingy containingl open? ings for the emission of sound'. l A 3. A sound amplifier comprising a base', a.` hollow. cylinder seated on said baseand provided with fixed ends at the rear and front,

`said front end'being perforate, means' in said base to contain a microphone, a hollow cone disposed upright in said cylinder,l the Q smaller end of the cone being in direct coin- N5 munication with 'the microphone', meansv in l said cylinder for bisecting the conefat larger end, and means for conducting sound wavesl separately in each side of the cyl-inderto' deliver the saine outwardly through the per- `11o A forstions in the frontend, alli-of said means being 'of constantly increasing cross sectional area.

4. A sound amplifier comprising abuse, a hollow cylinderseated on saidbase and'pro- 115 vided with fixed ends at lthe lrear and front, said front end containing an" oval latticed opening in its lower portion, said base 'containing a recess receptive-ot a microphone,"

means in said cylinderf to .conduct sound from the recess inthe base to the upper portion of thecylinder,.means to divide the sound waves, and meansto vcnduct the divided sound waves tothe opening lin the front wall of the cylinder, all ofthe sound' 125 conducting ineens progressively increasing in cross sectional 'area and wholly composed of wood. f f

5. A.; sound vamplifier ,comprising a thin walled wooden drum shaped body having@ 13o j ssemmsis copi Y aperforate front wall, a base on which the body rests, said base being provided with means to contain a microphone, Wooden partitions forming channels in said body to rel ceive sound from a,microphone, means to divide the sound waves in their passage through the body, said partitions being subject to minute vibrations and arranged to and means to conduct the sound wav ontl0 wardly through the perfornte front f of saidbody. This specification signed -and witnessed" this 10th day of December, 1924. A

GARROLD L. B AmEY.

constantly increase the of the'chyels,

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