US1392430A - Phonograph-reproducer - Google Patents

Description

0. R. MARSH.

'PHONOGRAPH REPRODUCER.

APPLICATION FILED mac. 9, 19m.

1,392,430. Patented 06a 4, 1921.

I E r UNITED STATES. PATENT. OFFICE,

'prrrorfoeaarn-nnraonnefin;

7 To all whom it may concern: 1

Chicago, in the county .usefi'il- Improvements in Be it known that I, ORLANno R. MARsH-, a citizen of the United 'States, res1d1ng at of lllinoisyhave invented certain'new Phonograph Reproducers, of which the following is a des-f'ription. a r

' My invention belongs to that general class of devices employed with phonographs and devices of that character, to audibly repro duce from a record, the audible sounds which were employed in'making up the record. Ithas for its Object a device of the character described which shall accomplish the purpose stated in a more satisfactory and effective manner than'hasbeen heretofore possible, and thlsflll' a simpledevice which may be economically constructed and which possesses a very large degree of durability. To secure the fullmeasure of the advantages secured by my invention, I so arrange and assemblethe various parts as to dispense with all pivot'or knife-edge connections or supports, which by use are liable to become loose and rattle, and also to dispense with all springs requiring adjustment H To this end my invention consists'in the novel construction arrangement and-combination of parts herein shown and described, and more particularly pointed out in the claims.

In the drawings, wherein like reference characters indicate like or corresponding Figure device;

:Fig, 2 is a rear view of the same device; Fig. 3 is a section taken substantially on line 3-3 of Fig. 1;

Fig. 4; is a section taken substantially on the line 4;-& of Fig. 1,;

' plan view of the supporting 1 is a face view of my improved Fig. 5 15 a plate; and

Fig. 6 is a modification of the form shown in Fig. 5. I 7

In the drawings, 1 indicates the frame of the reproducer providedwith a removable back 2, and the usual diaphragm 3. The diaphragm is preferably maintained between cushions H in the well known manner and extends across the face of the frame as shown. The frame is provided with a base 5 to which is secured a supporting plate ,6 in such manner as to prevent free vibraof Cook and State and Specification of Letters latenti Patented 0 114 1921 Application me December 9,1918. -s'rial lio. 265,390.

of sufficient resiliency; to permit the freest movement of the free end ofstylus-bar 7 which it centrallysupports. For this purpose 'I-prefer to form'the plate of such material,-that;-;wh1le reliably supporting the stylus-bar 7 1t will permit the upper end of the same engaged with the diaphragm to reliably vibrate o-rfoscill'ate'in any direction. I have had very satisfactory results with metal such as-for example thin steel connected to the base at -three points arranged in a triangular position.

or similar material for the "plate similarly supported, 'and-in still others I haveemployed a combin'ationof both. "In order to In other cases I V ham S e r results with hard rubber secure the desired freedomof' vibration of the free' end' of the stylus-bar, I prefer to 'reducethe' area of the plate and to connect the-same to the base at certain points, thus permltt ng free vibration of'the edges of the plate between the points of support, which preferably consistof an odd number. As

shown in Fig-5, the; plate issupported at three points, as at; 8-, thusconstitu'ting a substantially equilateral triangle. A line from'one, support to another does-not at any point cross the center of the plate supporting-the stylus-bar, {thus permitting a free vibration thereof as stated. Y

In mounting-theplate upon the base 5, I also prefer to cushion the same by means ofvfiber or equivalent insulating or absorbing washers 9 placed between the head of the screws 10 and the plate 6 and between theplate '6 and the base 5. The stylus-bar 7 iscentrally positioned between the points of support, extends through and is supported by the plate 6, the bar being cushioned by fiber washers in its contact with the plate. Thus a fiber washer 11 ispositioned-between the shoulder or nut 12 onthe stylus-bar and the plate 6, said fiber preferably extending through the plate to preventcontact of the stylus-bar with the walls of theplate. A'

second fiber washer 13 is positioned between the plate 6 and the nut'l-i which maintains the stylus-bar upon the plate. The needle is inserted at thev central opening 15 and is maintained in position by the thumbscrew 16 in the usual manner. The engagement of the upper end of the stylus-bar 7 nections, if preferred.

. with the diaphragm 3 may be inany preferred manner. As shown, the end ofthe stylus-bar is enlarged/as at- 17 to form a shoulder on one side with a screw 18 extending through the diaphragm and a nut 19 on the opposite side. The stylus-bar, however, 'ma be secured to the diaphragm by means 0 the usual cement or waxed con- In, the preferred form the back 2 is secured to the frame 1 in such manner as to require, only a single screw 20 in connecting the parts. This is accomplished by forming a: greaterdegree' of resiliency than if the.

arms 22extended diametrically opposite one another. The arm is supported at the center to freely vibrate with but limited restrictions, owingto the method of. support.

. In practical use the device has been found to be extremely sensitive and very satisfactory, in its operation. both with the hillanddale and with the lateral cut records. It is obvious that after having thus described my invention, various immaterial modifications may be made without departing from the spirit of .m invention, hence I do not wish ,to beun erstood as limiting myself to the exact form;or.construction set-forth.

, vWhatv I claim as new: anddesireto secure by Letters Patent is:

1.. In a phonograph reproducer, a frame provided with a base, a diaphragm carried by the frame, in combination: with a resilient plate supported on the base at three or more points so arranged that a line passing from one point to another point will not pass through the center of the plate to permit free vibration of the edges of the plate, a stylus-bar centrally supported by the plate with relation to the points of support, with one end extended and engaged with the diaphragm. I

2. In a phonograph reproducer, a frame provided with a base, and a diaphragm carried by=the frame, incombination with a resilient plate mounted on the base, support:

ed at three points thereon arranged in tri angularposition, the margin of the plate odd numberof oints regularly spaced from one.-another,j:t e margin of the platelbe-' ward towa'rdlthe center, and -a stylus-bar centrally supported by the plate with an. end extended and engaged with the diaphragm;

tween'contiguouspo'ints,being inclined in 4. In -a phonograph reproducer, al frame having a base, and a'diaphragm carried thereby, ajplate adapted to be securedto the,base, said plate having a central por tion, and a plurality of relatively resilient ,arms radiating from said central portion at a .plurality of points around said central portion and adapted to be secured to the base to permit said plate to freely vibrate, and a} stylus barsupportedby the body portion of said plate adapted tovibrate therewith, and having one end connected. with the diaphragm.; a V

5.'In a phonograph reproducer, a frame having a base, a diaphragm carried thereby,

arresi-lient plate adapted to" be secured to r the base, said plate having a plurality .of separated arms extending radially from the body thereof and connected near their ends with the base to permit a free vibration of the plate, and a stylus V-bar passing "through thezbody portion and supported thereby, adaptedto vibrate with the plate, one'end of the stylus bar being connected with the diaphragm. a ,6. In a phonograph reproducer, a frame having a base, a diaphragm 'carriedthereby, a plate adapted to be secured to said base, said plate having a central portion with a plurality of resilient arms extending .ra-

dially from different points of the circumferencefof said central portion andadapted to be secured to the base to permit said plate-to vibrate freely, and-a stylus bar sup-V ported by the body portion ofthe plate adapted to vibrate therewith and having one end connected with the diaphragm.'- In testimony whereof, I have hereunto signed my name in the presence of two sub-' scribing witnesses. e v ORLANDO R. MARSH... I

Witnesses: I

'J0H1-I ;W(HIILL, 1 I CHARLES I. COBB. j

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