US2491046A - Dental flask - Google Patents

Description

A. HORA DENTAL FLASK Dec. 13, 1949 2 She'ets-Sheet l Filed Feb. 25, 1947 Dec. 13, 1949 A. HORA 2,491,046

DENTAL FLASK Filed Feb. 25, 1947 2 Sheets-Sheet 2 2/ y /9 @J3 20 jhnw Hora? W fmwff;

Patented Dec. 13, 1949 UNITED STATES PATENT OFFICE 2,491,046 DENTAL FLASK Anna Hora, Cleveland, Ohiov Application February 25, 19457; Serial No.v 730,676 l 3 Claims.

My invention relates to dental flasks for making dentures and more particularly to a novel construction thereof which facilitates assembly and disassembly of the sections thereof and removal of the plaster investment and separation and removal thereof from the denture of acrylic or methacrylate and teeth without cracking or checking of the former or cracked or broken teeth.

With the asks at present in use it takes fifteen to twenty minutes to pound them open with a hammer or other tool, and the dentures and stone model are left firm, with the stone hard set and unbroken, so that dental technicians sometimes check and crack the dentures and one or more teeth, thereby requiring resetting and replacing such teeth or remaking of the denture, causing hours of extra labor and cost, as well as misfits.

My flask comprises upper and lower hinged sections and top and bottom lids or covers in the form of flat plates all of suitable metal, the hinged sections being held together or closed at their free edges and the lids on the top and bottom, by readily disengaged resilient snap fasteners and the adjoined edges of the parts having registering pry slots or notches so that only a pry tool or screw driver is required to open and close the flask sections without requiring hammering and leaving the teeth perfect.

Another object is to provide means to form the plaster investment for the denture in the mold or ask, in segments, preferably ve, which are joined together by thin portions at recesses therein cut away nearly to the imbedded denture so that the segments may be readily separated and broken away from the denture in addition to easy separation of the plaster from the flask sections by lining the latter with tin foil covering, the parting line or joint between the upper and lower sections so that the plaster and denture may be easily and quickly taken out ofA the flask when opened, so that to open it is to clean it, thereby overcoming the objections, diiiiculties and cumbersome methods generally employed in addition to requiring no hammering, less plaster with a saving of at least making it much easier to remove the plaster from the denture than where the plaster is thick all around, safer, and avoiding breaking, checking and cracking of the acrylic or teeth as pulling the teeth out or loose.

The invention also comprehends the provision of curved tapered parting fins or partitions extending in from the walls of the iiask sections in a direction away from the hinge or pivot thereof adapted to form segmental recesses in the edge of the plaster to points in close proximity to the denture and a similar fin or partition iriserted in opposed recesses in the sections where' they come together opposite the hinge joint, so that when the sections are swung open, Vthey easily move out of the recesses in the plaster; slip or release therefrom without resistance due to the movement thereof in the same arc traveled by the sections on the pivots or hinge pins so that there is no tendency to crack the denture', and no ba'ckdraftkorundercut to resist opening' thereby facilitating removal 0f the plaster with the denture therein and separation of the plaster from the denture after such removal and making the device 50% quicker, easier and safer to use.

The present invention consists in the novel form, jcombinationi and arrangement of parts hereinafter more fully'described, shown in thev accompanyingdrawing, and claimed.

' In the drawings: Figure 1 is a front elevation of the improvedl flask 0f my invention. V

Figure 2 is a side elevation thereof.

Figure 3 is a rear elevation. Figure 4 is a sectional view taken on the line 4 -4 of Figure '1. Vg Figure 5 is a perspective view of the plaster investment with a denture therein removed from the flask, and Figure Gis 'a fragmentary section taken on the line 6-6 of Figure '1.

Referring to thedrawings in detail, the novel easy out dental flask is shown as comprising upper and lower lateral sections IQ and II comprising side walls each having substantially concentric portions I2 and obtusely curved portions IS oflarger. arcs with relatively flat side portions I4 therebetween. The ends of the portions I2 are provided with interiitting apertured ears I5 and lugs I5 hinged or pivoted together by means of pivot pins or pintles l'I separately pivoting the parts of each section to swing together or apartl as shown by the arcs X as seen in Figure 4. y

, The free ends of the side walls are designed to abut in closed relation and are detachably held together bysnap fasteners I8. For this purpose, the sections'at the outerfaces of their portions I3 in spaced relation to their abutting ends, are provided with slightly oppositely undercut tapered notches I9 into which inwardly extending slightly oppositely curved or inwardly converging lugs 20 at the ends of the bars of the snap fasteners I8, which may be slightly resilient, are adapted to frictionally engage. One end of each bar is also provided with a projection 2I spaced from the outer beveled face of a notch, beneath which a screw driver or similar instrument is adapted to be engaged to pry oir or dislodge the fasteners to permit the sections to be opened.

Sections I and II are fitted together at coacting edges and the open top and bottom are closed by lids or covers 22 and 23 detachably held in positron. For this purpose, the opposed relatively at portions I4 and lids 22 and 23 are provided on their outer faces and edges with transverse aligned grooves 24 in which guide bars 25 and 26 are secured as by screws 21 engaged in, threaded apertures in the wall portions I4. The upper bars 25 are longer than the lower, bars 2,@ and overlap the lower section II partially and.A have two securing screws attach-ingto the upper section IU, while a single screw attaches thelower bar. The ends of the grooves 24 at lids or covers 22 and 23 are inset or beveled as at, 28 frictionally engaged by angularly projecting end lugs 29 which may be beveled as shown. These bars 25 and, 26 hold the flask sections and lids in register; and may be removed by removing or loosening the screws and pried loose by a screw driver at undercut inset or beveled groove ends 28. In addition, one or opposite sidesY I4 adjacent grooves 24 may be providedwith registering tapered pry slots or notches 3U at the coacting faces of the sections and edges of the lids or covers, for the insertion and twist of ascrew driver or the like to separate thesections and lids to take theflaskV apart.

The walls of the flask sections are provided withA curved tapered parting fins or partitions 3| extending in from the walls of the flask sections in a A direction away from the hinge or pivot thereof or c urved in arcs so as to swing or move along the arcs X swung by the sections when opened and closed. Two spaced insl 3l areA provided on each side at portions I3, and in addition, a fifthl n or partition. 32 is removably inserted in coacting corner recesses 33 in the inner facesand abutting ends of the sections.r The fin32'is tapered at its inner end and extends toward the pivot I1 to ferm two segments S the plaster investment P between the denture D, the adjacent fins 3I and portions I3 and I4. The 3Ijform three segmentsT therebetween, so that there are, ve segments in all joined by thin portions Yf at recesses B. formed by said ns extending in from the edge of the plaster. By reason of these thinor fragile portions Y, the segments maybe readily separated and broken away from theY denture. TheA pivot ears and lugs I5 and I6,` also form arecess U in the plaster. When the snap fasteners I8 Vare removed, the tapered o r wedge partition 3,21mayV bereadily removed from thefplasten besides being released from the abutting endsof the sections when separated, and since the @ask is lined with foil and the curved 3| move in the arcs X theV l same as the sections I0 and II after removing the lids, the fins 3 I will readily move, pull out,slip or withdraw from the plaster investment leaving the recesses and thin frangible portions to permit the plaster to be easily broken away from the denture, without hammering', breaking, checking or cracking of the denture andteeth. As the GIL upper and lower flask sections are the same, the stone model with the plaster below and the dentures with plaster above are out with the twist of a screw driver. The plaster and denture are easily taken out of the flask or the latter easily removed in a few minutes safely Without mistakes and cracked acrylic or broken teeth. The flask will last indefinitely in service as it does not require hammering or severe treatment to use it, and the plaster recesses produced by the fins require less plaster with ve integral segments easily broken away from the dentures, leaving very little plaster to dispose of.

IY claim:

1'. In a dental flask, a body section composed of two4v similar parts hingedly connected at corresponding ends and each having an inwardly projecting and tapered investment dividing ns, said finsbeing spaced from and cured in a direction concentric with the hinge connection between said parts, said fins being of the same vertical Width as said body section.

2. In a dental flask, a body section composed` of two similar parts hingedly connected at corresponding'e'nds and having spaced inwardly projecting and tapered investment dividing iins which are spaced from,4 and curved in a direction concentric with the hinge connection between said parts, said parts having mating recesses. in the inner corners of their other ends, a removable investment dividing iin having its outer portion4 leived in saidrecesses, and means releasably securing said other ends together and' retainingV the outer portion of said removable fin in said' recesses.

3. A dental flask, comprising an open-ended' body composed of two similar superimposed body sections, each body section comprising two similar parts hingedly connected together at corresponding ends and4 releasably secured together at their other ends, said parts having allned transverse.

body section4 and having corresponding ends-A thereof engagingthe other` cover to secure it in place..

ANNA HORA.

REFERENCES CITED The followinglreferences are of recordinthe le of this patent:

UNITED STATES IEA'I'EN'I'S` Number Name Datev4 246,234 Starr Aug. 23, 1881 684,253 Houston v Oct. 8, 19,01V

2,030,524 Lambert Feb. 11, 1936 2,159,437 Kirby May 23, 1939. 2,328,285 MacDougall Aug. 31, 1943

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