US1769603A - Dental casting machine - Google Patents

Description

July 1, 1930.

J. A. PHILLIPS DENTAL CASTING MACHINE Filed Feb. 16, 1929 IN V EN TOR.

U R m vm. AH fl Patented July 1,1930

ESIP AT Em TFFICE JoHN ADAM rHILLIPsfoF woonsInE, NEW YonK,' ssIGNoR TO Bonus DENTAL V CASTING 'MAcnINncoi/rrnnY, Ind, on FLUSHING, NEW YoRI A oo-R'Pomvrron or NEW Yonx V DEnTAL oAsTINeMAcHInE Application filed February 16, 1929. 'S.eria1-No.',340,3 54.

This invention relates to dental'casting machines suchas are used by dentistsin casting plates,,bridges, inlays or other restorations.

In machines of the character specified, a

cap is used for closingthe flask-inwhich the casting is to be'formed and comp'ress'edair is admitted to thelcap for the purpose of insuring aperfect casting and forcing the metal into all port-ions, of the mold cavity.

-The invention has for its salient object to provide a simple and practical construction of castingmachine ofthecharacter specified and, furthermore, a machine capable ofadjustment for use with difierent sizesoffiasks.

Another object of the invention is to pro- Vide a machine of the character specified, so constructed-and: arranged that the cap which fits over the top of the flask can readily aline itself with the plane of the upper edge of the flask body. I

Further objects of a part of this application, and in which Fig. 1 is an elevational view, partly in section, showing a casting machine constructed Y t and a mold cavity of the desired form and in accordance with the invention;

Fig. 2 1s a sectional ele'vatlon taken sub- 1 stantially. on'line 22 of Fig. 3;

taken s'ubstantiallyon line 8-301 Fig. 2; Fig. 4 is a sectional elevation taken through the cap or cover which .'Fig.' 3 but showing the air valve,for admit.

Fig. is a transverse sectionalelevation top of the flask;and

ting air to the flask, open. Y

The invention briefly described consists of. a casting machine having a support for, a. flask and a cap adapted to fit over the top of the flask. The cap is conne ted through suitable valve mechanisms to a compresed'airsupply, and means is provided for pressing the cap against the top of the flask and admitting,

-- air to the flask to force the gold or other metal i beingcast into thecavity of the desired con- ,formationin the flask. The means for moving thecapis so constructed and arranged as ;to provide a strong leverage and, further- .more, is so arranged that the; cap will autothe invention, will appear from the following specification taken 1n connection with the drawings, which form having an upper edge 22. v p n The flask 20 is invested with suitable mold fits over 1 the L ig. 5 1s a sectional elevation similar to I matically adjust itself to e position in alinement with the top of the'flaskand maybe adjusted in such a manner as to be used with flasks of different sizes and heights.

urther details of the invention, will ap pear from the following description. V In the form of the invention illu'stratedfin the drawings, the machine. comprises a jbase 10 on which is mounted .a pump, 11, acornpressed air .tank 12, and afsupporting base The Supporting base 13 for the fiask'h'as threaded opening thereinin which is threaded a post 16 on which is mounted a table17.

is supported on thetable 17 and has an open ing 21in the bottom thereofand an open, top

'The table 17 is preferably provided witha plurality of openings 18v therethrough, I

,.70 vA dental fiask20 of the usual construction L forming'material, such as plasterof Paris,

shapeis formed in theinvestiture. Molten metal is placed in the mold cavity and a cap is then placedover the moldand compressed air is admitted through thecap to the mold,

thus forcing the molten metalto completely fill the cavity in the flask. i d x In the form .of the invention illustrated, a-

cap 25 for closing the upper end of themold is. provided with an 'i pwardlyeXtending threaded sleeve Zdwhich is threadedinto a sleeve 27 formed on the. lower end of a tube 28. The tube 28extends upwardlythrough a collar 29 which is mounted for limit'edjpiv;

are pivotedin allevergl. The lever 31 ,is pivotally connected at.,32 toa block 33, which in turn is slidablymoiint ed on 'a vertical postf34 carried by the sup; f porting base 13. The lever 31 is also pivoted at the rear end thereofto; a pair oflinksi tO which are pivoted at their opposite ends to a spindle 41,mounted ina block 42 which is threaded on a'threade d portion 43 of the post,

otal movement on trunnions 30, which intiirn .34. The blockis vertically adj us table'on the post and after being adjusted to the desired heightis held from rotation by a set screw 44,

. the inner end ofwhich enters a'slot 45 formed in the post. A look nut 46 also holds the block in adjusted position."

' A y desired form oivalve control mecha- 'nism'may be used inthe machine and in the Q 51' formed in a tubularvalve casing 52 which j theupp n zend thereof and a collar, 56 suris threaded into the upper end of the collar 29. -A packing washer 53 surrounds the tubular member 28 and is positioned bet-ween I the thi'eadedendof 'thecasing 52 and the bottom of therecess in the collar 29 into which the casing iisithreaded.

LjT i tubular member 28 has a spindle 55.

connected to and extending. upwardly from round'sthe spindle andseats against the upend l m mber 28. "A nut54 isithreaded on the' spindle 55 and holds the collar 56in position and a packing washe'rGO is preterably interposed between the-nut and thecollarQ A spring 61 is mounted inthe 1 casing chamber 51 1 and seats at one end and at the other endagainst the nut 54:. a

I fWhen the lever 31 and the cap are notin operativep osition or, in other words, when the cap 25 is not disposed in engagement with the upper edge 220i the flask, the tubular 3 the spring 61 to the position shown in Fig.3", in which thelateral openings are closed; xHowever, when the lever is swung downmember 28wil1fbe pressed downwardly by wardly and the cap 25 is pressed againstthe upper edge 22 of theflask .20,"the tube'28 will.

. betorced upwardly, thus placing the ports or openings 50 in communication with the cham 'ber'51. The upper end of the chamber has a I tubular'extension 65' which isconnected by'a ghose 66 to the compressed aintank 12. I

I The cap 25 is preferably provided with an annular recess 70 which is disposed an annular packing 71 of suitable material, such, as

. asbestos fiber: The central portion of the j the cap 25.1%", e V

T e-,machihe; o crates in the following manner: When a" ask having a mold, therein" bottomof' the ca'p25 has an annular wall 72 l 1 having a recess 73 communicating with a cenfilial opening 7 4 inwhich is positioned a thimthe ,5 h v ng new Op ng 76 at s lower a-flange 7 7 atits upper end. The, rfla'ngef'fi seats "against tl ilpp r end ofthe T'threaded sleeve26 and when-the sleeve. is 1; threaded into the sleeve 27 the flange ofthe u r is'securely clampedbetweenthe upf perend ofthe'sleeve26 and theend of the jopeningfin the sleeve27; A packingwasher :78 ispreferably-positioned. between the lower en 0 f the sleeve27 and theupper surface of is positioned on the table 17, and the table ,has'been adjusted to the proper height and Y' the block 42 has also been properly adjusted,

the lever 31 is swung downwardly to the posi tion shown in dotted lines in Fig. l, and pressure; is exertedthereom causing. the valve ports 50 to communicate with'the chamber 51. Air from the compressedair tank will pass through the chamber. andvalve ports and downwardly thro ugh. the tube,28; and thimble 755mm the flask. The compressed air-iromjthe tank 12 will cause the molten metal in the flask to be forced into the mold cavity, thus completely filling the cavity. Should the operator desire to use a flask of different "height, 'the'table 1 7 or block 42 can be adjusted to properly position the cap 25. The pivotal mounting of the cap in the lever pe'rmits'the cap to properly aline itself withthe top 22 o'fthe flask. j I i Although one specific embodiment of the invention has been particularly shown and described, it'will bejunderstoodthat thevinventio n is capable otmodification and that changes in the construction and'in the ar- 'rangementjof the-various cooperating parts may' bemade without departing from the spirit or scope of-the invention, asexpressed gainstthe up er end of the casing. chamber" T What I claim isz in thefollowing claims 'y i 1. A. dental casting machinercomprising a' flask support, a flask on said supporfla compressed air supply tank, valved means for conducting air fro-mthe tank to said flask 1 and constructed to spray the airinto the" flaslg; said means including; a pivotally mounted cap adapted to'fit over the top of the fla'sk,= means for moving said cap into engagement with andaway from the flask, said means being e'fl'ective to open andclose the valved means, and means connected there to for supporting and' vertically guiding said 'movingmeans. I Y

2; A dental casting-machine 'comprjisinga flask support, a flask thereon,' a cap adapted" d to fit over and close the upperend of said flask, a valveftube in said cap having perforations; adj acent one end for establishing communication with the interior ofthe flask and connected at its other 'endto asource ofc'ompressed air, a lever; "and means pivotally connecting saldlever and saidfcapwhereby thelever will move the-cap into and out of engagement withsaid*flask,'said means and cap being relatively movable to pro vide a valve Eac'tionin said tube.

3. A dental casting machinecomprising a flask support, a flask thereon, a cap adapted to fit over and close the upper end of said flask, a valvetubein said cap having perforat1ons adJace'nt one end for establishingcommunication with the interior of the flask and connected atits' other end to a source of compressed air, a lever'connected to saidcap and adapted to move the cap into and out'of' en gagement with said flask and to open and close the valve of said tube, a link connected to said lever, a vertically adjustable pivot for said link and means connected thereto for supporting and guiding said lever for movement in a vertical plane.

4:- A dental casting machine comprising a flask support, a flask thereon, a cap adapted to fit over and close the upper end of said flask, a valved tube in said cap having per- 7 I forations adjacentone endvfor establishing communication with the interior of the flask and connected at its other end to a source of compressed air, said cap being'recessed adjacent the perforations thereby to deflect the air throughout the flask as itis sprayed, means connected to the cap to move the same into andout of engageinent With the flask and to control the valve of the tube, and means for supporting and guiding said last named means.

JOHN ADAM PHILLIPS.

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