US1414566A - Dental flask - Google Patents

Description

J. A. AND u. s. GARDNER.

DENTAL FLASK.

APPLICATION msn MAR. 24. 1921.

r 1,414,566, Fatemi May 2,1922.

vso

. r. STATEsf-PATENT OFFICE.

JOSEPH A. GARDNER AND DAVID S. GARDNER, OF MMPHIS, TENNESSEE.

DENTAL FLASK.

'To all whom it may Concern:

Be it known that we, JOsEPH A. GARDNER and DAVID S. GARDNER, both citizens of the United States, residing at Memphis, in the county of Shelby and State of Tennessee, have invented certain new and useful mprovements in Dental Flasks, of which the following is a full, clear, and exact description, which will enable others skilled in thel art to make and use the same.

This invention relates to improvements in casting appliances, and consists more particularly in improvements in the flask and crucible or ladle holder for holding the investment material, or lmaterial of which the mold and melting Crucible or ladle are made. It particularly relates to a flask having an integral crucible, or ladle, holder whereby the Crucible and mold may be formed in one piece withoutjoint through which the metal might escape in passing from the crucible to the mold. j

, The improved flask and crucible holder containing the combined mold and crucible constructed as hereinafter set forth is especially designed for use in a centrifugal casting machine in which machines the mold and crucible are placed on an arm adapted to revolve about a pivot, the crucible being placed nearer the pivot and the material contained therein being thrown by centrifugal force from the crucible into the mold. The means for, and method of forming, the mold and crucible in the said flask and Vladle holder are fully described and shown in our Patent No. 1,195,802 issued August 22nd, 1916, to

, be made in one piece especially for forming dental, jewelers, or other small Castings more particularly of precious metals in which 1t is essential that even the smallest loss of the precious metal be prevented; to' provide,l sec-y vshape of the device.

Specification of Letters Patent. Patented May 2, 1922, Application inea March 24, 1921'. `sensu No. 455,085. Y

and securely attached to theiarm of the centrifugal machine, this being a very essential With these objects in view, the inventionr consists in the novel details of construction and combination of parts more fullyl hereinafter disclosed in the drawings, specihcations', and claims.

In the drawings: Fig. 1 is a perspective view of the improved flask and crucible holder ;k

Fig. 2 is a plan view of the same "showing the crucible as formed therein.

. Fig. 3 is a section on the Center line, showing the liask and crucible holder with the crucible and mold therein also in section.

Fig. 4 is a perspective view of a modified Referring now to the drawings in which the various parts are indicated by the same numerals in all the views, 1 is the crucible holder, 2 is the flask integral with the crucithin metal of the length of the combined crucible holder andvflask and cutting away approximately'onel half of the same for the length ofv the crucible holder. 3, is a lug or extension from, the lower edge of the crucible holder 1 by means of which the same may be quickly clamped or secured to the arm of the centrifugal machine. It will be noted that both ends of the flask are open and that the end of the crucible is open, but that it may be closed either partly or wholly if desired. 4 is an'eXtension member for the flask 2 which in the preferred form is a metal tube adapted to fit over the flask 2 and to slide in or out thereon to adjust the length of the flask. 5 is a clamping screw, being a means to fasten the extension in they desired position. 6 is the crucible formed -in the investment material 7, 8 is a mold also formed therein and 9 a channel or sprue leading from the crucible to the mold. The crucible is made by means of a solid pattern of-metal, wood, or other material shaped to the desired form of the crucible 6.' In one end of the l pattern, a pin is placed to form the sprue 9 and on the end of this pin a WaX pattern of the desired casting is placed to form the mold 8. If the lwax pattern is small, the eX- tensione1 is brought even with the end of the Y to a molten condition, the machine is setin Vflask 2iflonger as shown theextensionflC is brought out until sufficiently beyondthe pattern and is then clamped in place by means of the set screw 5. Ordinarily in filling the flask and crucible holder the extension end a is placed at the top and the flask and Crucible filled from that end, a suitable holder being asedto hold the patterns and flaskduring the filling with investment or mold material.

lVhen the investment material has set or.

l hardened, the crucible Vpattern is removed and the `pin withdrawn from the sprue 9.

The wax pattern is then removed by heating,

"and the flask and Crucible holder containing the combined Crucible and- Vmold. is then placed on the arm of the castingmachine and attached thereto, the precious metal is placed in the crucible 6 and heated by the application of a blowpipe or otherintense flame and when the metal has .been reduced motion and the metal kthrown by centrifugal e force into the mold.

It will readily be seen that the amount of investment material that must be heated in removing the wax mold and that must be kept hot when reducing the metal is an importantfactor in quick and economical work and that an important .and valuable result` has been accomplished in furnishing the adjusting means whereby the amount of material needed can be properly and easilyv regu:

lated.. It will also be noted that lit is advantageous to melt out the wax ,pattern be 'fore placing thel mold and Crucible holder Y on the casting machine and that the lug for attaching the'same is of great importance because of the quickness with which the stood .that the cross section of the crucible i holder,'the flask, and thel extension may be rectangular, oval or such other shape as may be most satisfactory. lt will also be dis-V tinctly understood that the extension l may telescope within instead of outsidethe flask and that the clampingmeans shownv is typical only, and maybe varied from the form shown. A flask, 2a, ladle, la, and extension, Lla, of .rectangular cross Section is shown 1n v aving now fully describedour invention,

what we claim and desire to secure by Letters Patent of the United States isz*-n l. A casting appliance comprising anopen top crucible holder, an enclosed flask with open ends integral therewith, `.an extension for the said flask open at both ends and means of clamping the said extension.

"2. A casting appliance comprising an open top'V Crucible holder, an enclosed .flask with open endsrintegral therewith, an extension for the said flask, open at both ends,means for clamping the said extension in any de,- sired position relative tothe said flask and a lug extending from thebottom of theV said V.

ladle holder.

3. A'casting` appliance having a Crucible 1 holder -with a bottom and sides, a flask having sides Vand bottom integral with the sides and. bottom of the said crucible holder, and a top, and an extension having top, sides and bottom corresponding with thetoprsides,`

and ybottom ofthe said flask and adapted to increase the length thereof, and means for clamping the said extensionin any Yposition on'the said'flask. f. Y

ll. A casting appliancev comprising a'semir('iylindrical crucible holder, an integrali cylindesired drical flask, a4 slidably mounted cylindrical extension, means vfor, clamping the said eX- tension 1n any-'desired position and an in- Crucible holder, vflask and extension.

5. A castingapplian'ce comprisingasemicylindrical Crucible holder, an integral cylindrical flask, aslidably'y mounted cylindrical .tegralcrucible and mold "formed in the said extension, a screw foriclamping the said eX: .Y

tension in any desired `position,1and an in- -tegral CrucibleV and mold formed 1n the said Crucible holder,flask and extension.

v 6. A casting appliance hav'ng a 'Crucible holder with a bot-tom and sides, Ya `flask ha-v- Y ing sides and bottom, integral with thesides Aand bottomof the said crucible holder, V,and

atop, an extension having atop, sides anda vbottom coordinating with the top, sides and bottom of the said flask and adapted to' increase the length thereof,-means .for'clamp ing the said extension in any desired posi-V tion 011 the said flask, and an integral crucible andv mold formed inthe said `Crucible holder, flask and extension. A

In testimony whereof 'we have Ahereunto set our names. f jf JOSEPHl A. GARDNER l DAVID S.' GARDNER.V f

l/Vitne'sses: i

A l J. D. lMolMlURRY,V

H. M.VYHE ISIKELL. Y

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