US855557A - Process for making phonograph-blanks. - Google Patents

Description

PATENTED JUNE 4, 1907.

3'. W. AYLSWORTH.

PROCESS FOR MAKING PHONOGRAPH BLANKS.

' APPLIOATION FIL'ED JAN. 19, 1907.

UNITED srA'r as PATENT orrron.

JONAS W. AYLSWORTH, OF EAST OEA NGE, NEW JERSEY, ASSIGNOR To NEW JERSEY PATENT COMPAN Y, .OF WEST ORANGE, NEW JERSEY, A CORPO-.

RATION OF NEW JERSEX.

PROCESS FOFUMAKING PHONOGRAPH BLANKS.

Specification of Letters Patent.

Patented June 4, 1907.

Application filed Kanuary 19, 190']. Serial No. 353,007.

,graph-Blanks, of which the following is ade- I soription.

My invention relates to animproved roce'ss for manufacturing'blank record ta lets i for use on phonographs and allied talking mathines in which cylindrical blanks are employed, and my object is to provide a process y which the blanks may e manufactured economically and wherein the recording surface will be of a uniformly perfect character.

As phonograph blanks are now commer- Q1. cially made, they are formed of a homogene- \ous metallic soap composition consisting en- 0' er lly of stearate of soda, stearate ofalumina,

fre stearic acid and a hydrocarbon ingredi- (ent such as paraffin or ceresin. The aim of the manufacturer is to produce the composition in as pure a form as possible, and to this end the operations are carried on with cat care and the composition after being finished is generally subjected to one or more filtrations. Notwithstanding these precautions, however, the composition frequently contains minute gas bubbles as well as mechanical impurities, such as dust particles, small pieces of lint and crystals of saline impurities. These impurities when they appear onthe surface of the blanks result in an imperfect record which cannot be effectively used as a master from which to make a mold for-duplicating purposes. The encountering of these small imperfections in the blanks is annoying and expensive under conditions of commercial manufacture since in making the master a very ex ensive artist may be employed or an entire )and or orchestra yet the presence of a single piece of lint in the record surface or other imperfection therein, will result in the formation of a socalled blind, necessitatilng the discarding of the record and a new tria In applications for Letters Patent filed May 11, 1906, Serial No. 316,250; May 16,

1906, Serial No. 317,083; May 16, 1906, Se.

rial No. 317,082, and May 31, 1906, Serial No. 319,422, I have described certain processes for manufacturing duplicate sound I {records from matrices or molds consisting generally in rotating the mold at a high speed. and introducing therein a char e of molten or comminuted wax-like materia the mold being either hot'enough prior to the introduction of the material or being heated during its rotation so that the material will maintain its molten state, if introduced as such, or be rendered molten ifintroduoed in comminuted condition. Byreason of the rotation of the mold at a high speed the molten ma-' terial will be distributed uniformly over its bore so as to take a clean and sharp-impression, after which the rotation of the mold is continued until the material has become set,

and is finally removed by permitting it to contract-diametrically to a sufiicient-extent to clear the engaging surface. This general process is of espec al utility in connection with the manufacture of phonograph blanks, be

cause I have discovered that when the material in molten condition is maintained in contact with the bore of a rotating mold, the centrifugal effect is suficient to separate from the molten' material any foreign matter acci-' dentally lodged therein. Such of the matter, as-I'iiay be of greater specific gravit than the composition, for instance, grit an dirt, will be forced outward to the outer surface, on

the other hand, the material which is li hterthan the composition, such as lint or gas ubb'les, will be dis laced by the composition 1 3. After the mold has been and driven inwar rotated for about one minute at a speed of two thousand revolutions per minute, the wax composition. being maintained in a molten state, an eflective'separation of the impurities will have taken place. The mold while still rotating is either allowed to cool or is forcibly chilled so as tocause the material to set and harden, whereu on the rotationmay be arrested. A furt er reduction. of temperature effects a longitudinal con-.

traction of the blank, permitting its removal from the mold. The blank is now reamed on its-interior so as to fit the tapered mandrel of a suitable recording machine and is then sha'vedofi' on its exterior so as to present the desired diameter. The amount of material shaved off from the exterior of the blank should be of sufficient depth to include the heavier impurities which are driven out to' the surface. For this reason the molds it sulliciently to me purities, although this is not so important, will be,ob\'iouslv enwhich the blanks are made should be slightly larger than those now used, since the amount of material shaved oil will, to assure absolute certainty, be somewhat greater than is now removed under existing methods.

I In order that the invention may be better understood, attention is directed. to the ac- 'compair\;'ing drawings forming part of this sectional view tus similar to the latter being rotated by a driving roller It.

The mold! is shown as being provided with end caps 2, oneuot' which is removahleso as to maintain the molten material avithin the mold during its rotation. Any suitable means may be employed for introducing molten material within the mold,-as-t'or'example, aplun'ger pump -l mounted in atanlc 5, containing the molten materia'l.- lt'elerring to Fig. .2, I show the mold 2 as it appears when rotated ata high speed. the heavier particles fi'being driven by centriYugaLl'orce.

because of their greater specilic gravit zto the exterior ol the moltenmaterial 7. and.

the lighter particles and bubbles being dis-. placed and forced inw t'erial- Alter the blank is seta the outer surface is shared oll be ti containing the heavier impurities.-while preferably the innersurl'ace is reamed out.

nd removed.

heresulting blank tn'ely tree ol" unpuritics or nnpertections,on its recording surtaco. r r l 1 n v v 1 he composition nhiehl pltftl. to eniplo ard by the molten ma.

hide. all of the lighter ims l l l l i material.

this lNtli davol'tlanuarv ltlOT.

is that which is commonly used at the present time for making blank tablets and consists of the metallic soap mixture above generaltv described.

Having now described my invention, what 1 claim as new, and desire to secure bro-Letters latent, is as t'ollow's l. The process of nmking c vlindr' 'al-blank sists in rotating a hot mold at a high speed cont aining a charge of molten material within the same,"whereby the material therein will be distributed uniformly on its bore and a separation atthe ihipi'irities from the material will be ell'ected. in then allowing the mold t't'rcool so'as to set the material, in then removing the blank from the mold. and in linallv shaving oll' the outer surface of the blank so as to thereb v removeany impurities which may he lodged there-in. substantially as .and an. the purposes set forth; 3

l. .lh.e process of making evlimlr-ical blank maelnnes which I moltl at a high,

record tablets for. talking consists 'ln'rotating a hot speed containing. a: c-hargeof molten uniterial within the same, whereby the material 7 tionon. its ,bore and a se aaration'of the, m- .purit ies, l'rom thcauaterial .therein will be distributed in. molten condrwill be etlectethin then allowing]hemold to oool;stj as 'to themold. inshaving oil' the the lilanhso' as to therebx; removeauy unlinishiug.theinterior ot the' blank, substantiallv.as.and,tor.thepurposes setfm-ph, I 8'0.-

-'l,his specification} signedfand witnessed \l'itness L FRAQJK l llv -a A v v Fnaxa l). la-zwis, v

record tablets l t rtalliing maehi'ncs which con.

set the, 1 in .then removmgthe blank from "outer surface" of uuities which maybe lodged; therein, andin' i

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