US1231277A

US1231277A - Tone-purifier.

Info

Publication number: US1231277A
Application number: US13307416A
Authority: US
Inventors: Charles P Marshall
Original assignee: Individual
Current assignee: Individual
Priority date: 1916-11-23
Filing date: 1916-11-23
Publication date: 1917-06-26
Anticipated expiration: 1934-06-26

Description

c. PL..MAnsH-ALL.

TONEPURI'FIER.

APPLICATIQN'FILED NOLvZS. i916.

1 ,23 1 ,277, .Patented June 26, 1917.

2 SHEETS-SHEET l.

WITNESS JN VEN TQR.

C. P. MARSHALL.

TONE PURIFIER.

' APPLICATION FILED IIov.23` 1915.

Patented June 26, 1917.

2 SHEETS-SHEET 2.

)N VEN TOR. CHAaw/,OMPML 'A Tron/v5 Y.'

CHARLES l. MARSHALL, OIE WATERTWN, NEW YORK.

TONE-PURIFIER.

'To all fui/tom t may concern.'

and the like.

Be it known that l, CHARLES P. MARSHALL, a citizen of the United States, residing at lVatertown, in the county of J eerson and State of New York, have invented certain new and useful Improvements in ll`one- Purifiers, of which the following is a speciiication. Y

vThis invention relates to tone purifiers designed for phonographs, talking machines `The invention relates particularly to improvements 1n the class of devices shown and described in my United States Patent N 0.1199197, dated September 26, 1916.

y The principal object of the present invention is to increase the symphonic quality and degree and to improve the acoustic quality and degree of tone purifiers of the class. A furth'er object is to provide a hollow resonator or acoustic chamber substantially in the form of a truncated cone having one flat side. A further object is to extend the fiat side of the resonator more or less in one or more directions, for varying the symphonic quality and degree of the i purifier. A further object is to provide various shaped` tone and sound modifying openings in different parts of the body for varying the degree and quality of tone and sound. A further object is to provide a dome top for the body which mav vary in size and shape, for improving the acoustic and also the symphonic quality and degree of the purifier. And a further object is to provide sound modifying tension cords or snares which may be applied to either the body or the wings.

I attain these objects by the means set forth in the detailed description which follows, and as illustrated in the accompanyingl drawings, in WhichvFigure l is a top plan view of the purifier embodying my improvements. Fig. 2 is a front side elevation of the same mounted I upon a well-known reproducer. Fig. 3 is an i end elevation of the same. Fig. 4 is a modi- Specification of Letters Yatent.

Application lcd November 23, 19i6. Serial No. 133,074.

top and a hollow sounding board. Figs. 9 and l0 are respectively a top plan and a side elevation of a modified sounding board.

In the drawings, 2 represents generally the reproducer of a talking machine, including the annular rim 3, the. diaphragm 4, the vibration bar 5, and the needle G, all of which parts may be of the usual style orv make.

7 represents the hollow resonator comprising the body of the tone purifier, having one open end 7', which faces the diaphragm 4 and rests upon or engages the rim 3. The body 7 is preferably larger at its top than at its bottom, and its top end is closed by a dome 8, whose eaves preferably extend beyond the walls of the body, as shown in Figs. l, 2, 3 and 6. The domes, however, may extend more or less beyond the bodies, for varying the quality and degree of resonance, The doines are employed particularly for more perfectly focusing the reflected resonated sound waves upon the diaphragm. 9 represents a number of tone and sound modifying openings, which may be disposed in different parts of the hollow body 7, but these openings are preferably positioned at the opposite sides, as atthe intersection of the body with the flat side 10.

'as well as at the rear extremity of the dome 8, as shown at 9. v In the present case,vthe flat side 10 is preferably continued in opposite directions beyond the body or bell 7,

for providing wings or planes, as lO-10", preferably of untqual size and varying shapes. By thus extending the fiat side or sounding board of the resonator, the symphonic quality and degree of the instrument is varied, thereby rendering the reproductions of the records more clear and perfect than heretofore. The wings 1010 may be arranged in the same plane as the fiat portion 10, or Ithey may be curved or otherwise bent, as shown in Figs. 9 and l0. This curving of the wings tends to steady the whole sound board, thus controlling the vibrations to a better degree and giving to the tones added clarity and brilliancy. The bell or body 7 is preferably in direct and positive contact with the rim 3 of the sound box or transmitter 2, so that the vibrations of theV said rim are communicated to the bell, and particularly to the flat side l0 and the wings 10-l0, where the vibrations are symphoniously propagated, after which they are resonated by the acoustic properties er the hollow body 7. The tones and sounds of the instrument are still further improved' as to clarity and tone color by providing one or more tension cords as 12--12, which are applied to the body, as well' as to different parts of the extended sounding board. These tension cords may consist of any suitable material, but they are preferably made in whole or in part of exible or elastic material. In Figs. 2 and 6 are shown a numloer of the tension cords applied to the different parts of the body 7, as well as to the position into which the cords are placed has a different modifying effect. These tension cords tend to steady both the vibration bar and the resonator, as well as the wings 10-10. The principal function of th`

e cords

12 and 12 is to restrain the vibrations of the parts and thereby vary the symphonic and acoustic resonance, producing various pleasing qualities of'clarity and tone color.

ln Fig. l is shown a relatively large bell shaped resonator 7 a, having a flat top Sa and an elongated laterally extended sounding board 10a ln Fig. is shown a smaller conical resonator 7 havinga simili dome top 8" without eaves and a relatively short sounding board 10". ln this view the resonator is shown supported on the transmitter 2 by means of 14;. I find that to apply my resonator. to certain makes of reproducers it is necessary to provide the legs referred to. Besides by thus restricting the metallic connection between the resonator and the casing 2 materially modifies or changes the purifying effect.

ln Fig. 7 is shown a fiat top resonator to which is applied a modified sounding board l0, wherein the extended wings are substantially the same size and shape, and in which l provide tone and sound modifying riln 15 and bars 16, which Vary the quality and degree of resonance.

ln Fig; 8 is shown a resonator 0r bell 7r1 having a dome top 8d, which slightly 'overhangssthe walls of the bell, and a tone or sound modifying chamber 17 arranged within the extended sounding board 10", for still further varying the quality and degree of resonance.

ln Figs. Al and Q are shown rubber or other tone modifying masses or weights 20. which are preferably fastened to the wings ily-10 by screws Q1, the latter passing through perforations 22 in said wings. The masses 20 may be disposed in different positions on the wings, as indicated by dotted lines in Fig. 2 for giving rigidity to and steadying the different portions of said Wings. By the use of the masses 20 the vibrations of the different portions of the sounding board 10-10 Ymay be varied-restrained, for modifying the symphonic quality and degree of the tones and sounds.

In operation, the vibrations of the needle 6 are transmitted to the diaphragm 4 and from the diaphragm into the casing of the soundbox of the reproducer 2, the latter transmitting them into the walls of the purifier 7. Thusthe vibrations permeate the en-z tire structure of the purifie and' are symphoniously propagated largely throughout the extended flat side, and also throughout the extended top or dome 8, they are then resonated by the acoustic properties of the purifier 7 and reflected on to the diaphragm, which receives them and transmits them as improved, puried tones and sounds, 'synehronously with the regular tones and sounds of the diaphragm. This results in the tones and sounds in the music' and speech being enriched, strengthened and purified by being multiplied and given a wider range to spread and develop throughout the ample size of the extended flat side and also by the improved acoustic quality of the purifier, partiqularly the enlarged top ol the part i', as herein shown and described. l"urtherrnore.y by this improvement the tones are enriched by largely overcoming or col oring the raw nasal note of the diaphragm by the increased, rich, fundamental tone of. the purifier. Improved articulation and enunciation are effected by the improved acoustic qualities of the purifier, which is attained by the peculiar proportioning of the body 7, and by better focusing the reflected sounds, upon the diaphragm by means of the dome 8, as well as by the provision and arrangement of the various speaking openings f) and il.

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

I. tone purier comprising a hollow body having one open'end and one closed end, the closed end comprising a dome haring projecting eaves, and a sounding board comprising one side ol said body and havi body having a reduced open end and an enlarged closed end formed dome-shaped, a sounding board comprising one side of said body having wings extending laterally beyond said body, and a plurality of tension cords secured to said body and also to said wings. l

4. A combined acoustic and symphonic tone purifier, comprising a hollow body having one fiat sidecomprising a sounding board, the ends of said board extending laterally beyond the body, and said body having tone and sound modifying openings adjacent said wings.

A combined acoustic and symphonic tone purifier comprising a hollow body having an extended dome-shaped top and sound modifying openings, and a sounding board comprising one side of said body and having wings extending laterally beyond said body. i

6. A tone purifier comprising a hollow body having one flat side which extends in opposite directions beyond the body, said body having an extended dome-shaped top and tone-and-soimd modifying openings positioned at the intersection of the body with the flat side. I

7. The combination with the diaphragm and the casing of a reproducer, of a symphonic Vresonator comprising an extended sounding board, and a body supporting and conducting the vibrations from the casing to the sounding board, said body having an acoustic chamber receiving sound waves from the diaphragm.

S. The combination with a reproducer including a diaphragm, of a symphonic resonator comprising an extended sound board, and a hollow body supporting said sound board having an acoustic chamber provided iwith a dome'top adapted to focus sound waves upon the diaphragm.

9. The combination with a reproducer including a casing, a diaphragm and a needle bar, ofa hollow body, the lower end thereof being open and engaging said casing, the upper end of said bodyclosed by a dome, a sounding board disposed at one side of said body having wings extending laterally from Vsaid'body, and saidv body having a plurality of sound-modifying openings disposed at the intersection of the body and the sounding board.

10. The combination with a reproducer, of a hollow body having a contracted lower end engaging the reproducer, its top end bcing enlarged and surmounted by ay dome, one side of said5 body being flat and provided with laterally extending wings, and said body having a plurality of tone and sound-modifying openings disposed at thev intersection of the body with said wings and between the dome and the said flat side.

11. The combination with a reproduccicomprising a casing and a diaphragm, of the hollow body having an open end in cngagement with saidycasing and facingsaid diaphragm, the top of said body being enlarged and dome-shaped, and an elongated sounding board supported by said body and having wings extehding laterally in oppo.- site directions beyond said body. ,Y

l2. A tone purifier consisting of a hollow acoustic body having one flat side comprising a sounding board, the ends of said board extending laterally beyond thc body, and a plurality of sound' and tone modifying masses mounted on the said sounding board.

In testimony' whereof I aiiix my signature.

CHARLES P. MARSHALL.