US1464657A - Dental casting machine - Google Patents

Description

Au 14, 1923. mks? S. L. JEFFERIE$ DENTAL CASTING MAGHIE Q 4 Wmwt 1 Filed Jan. 1922 all W/TNESSES o i INVENTOR 5L. Je ffn s,

ATTORNEYS Au 114, 1923. HAMfiS? S. L. JEFFERIES DENTAL CASTING MACHI NE Filed Jan. 5,1922 4 Sheets-Sheet 2 J 5 I "4 2 is ga I A TTOR/VEYS Au 14; 923. I

Emma? s. JEFFERIES DENTAL CASTING MACHINE Fil'ed Jan. 5

192g 4 Sheets-Sheet 3 IIVI/ENTOR WITNESSES A TTOR/VEYS AQQM, 1923. 1,44%?

' S. L. JEFFERIES DENTAL CASTING MACHINE Filed Jan. 5, 1922 4 Sheets-Sheet 4 3. LJejjeraQs A TTOR/VEYS Patented Aug. 14, 11923.

pants at Lddehtihi SAMUEL LIONEL JEFFERIES, 01F GAFFNEY, SOUTH AIEtOLINA.

DENTAL CASTING MACHINE.

Application filed January 5, 1922. Serial No. 527,184.

To all whom it may co nce m:

Be it known that I, SAMUEL LIONEL Jar- FERIES, a citizen of the United States, and a resident of Gafi'ney, in the county of Chero kee and State of South Carolina, have invented certain new and useful Improvements in Dental Casting Machines, of which the following is a specification.

This invention relates to a dental casting machine.

The object of the invention i to provide a machine or device adapted for casting teeth from gold, porcelain or other fusible material in a highly eiiicient and expeditious manner.

It is also an important object of the invention that the device be extremely simple in construction and eas to manipulate.

Other objects and o jccts relating to details of construction, combination and arran ment of part will hereinafter appear in t e detailed description to follow.

The invention is illustrated by way of example in the accompanying rawings, in which z- Figure 1 is a view in side elevation of a form of the present dental casting machine and with parts broken away and shown in section to more clearl illustrate the same.

Figure 2 is a top p an view of the same.

Figure 3 is a view similar to Figure 1 but showing a slightly modified form of the invention.

Figure 4 is a detail plan view of the crucible table shown in Figures 1 and 3.

Figure 5 is a view imilar to Figure 4 but showing a slightly modified form of the crucible table.

Figures 6 and 7 are views similar to Figures 4 and 5 and showing two additional modifications of crucible table.

Figures 8, 9 and 10 are vertical sectional views of different forms of casting rings.

Figure 11 is a side elevation of a further modified form of casting ring.

Figure 12 is a side elevation of a casting ring of the type shown in Figure 9-and also illustrating the same within a novel form of receiver pan.

Figure 13 is a bottom lan view of the receiving pan shown in Figure 12.

Figures 14 and 15 are views similar to Figures 1 and 2 respectively, but showing the modification of the invention.

Like reference numerals refer to the same parts throughout the different views.

Referring to the drawings more particularly, B indicates generally the base of the casting machine which may be of any preferred shape, preferably rectangularly as shown, and extending upwardly from a point adjacent the one end of the base is a post '10. The post 10 is preferably square in cross section and the greater portion thereof hollow and within the post there is slidable an extension 11, said extension being square in cross sectionand the interior of the post 10 bein adapted to slidingly receive the same an also hold the extension 11 against turning movement. Threaded through the upper end of the post 10 is a set screw 12 whereby the extension 11 may be adjustably held with relation to the post 10. The upper end of the extension 11 terminates in an enlargement 13 which is bifurcated at its free end and provided with a. bolt 14, said bolt pivoting or fulcruming a lever bar generally indicated by the reference numeral 15. 'A free end of the lever bar is connected to the one end of acoil spring 16 while the other end of the coil spring is connected to a hook 17 made secure to the base B. Also the lever bar 15 is formed with an enlargement occuring intermediate the ends of the same as shown, and the pur ose of which will later become apparent. 'Fhe lever bar 15 is also formed with a rounded end portion 19 to serve as a handle therefor. The spring 18 is adapted to normally hold the handle end 19 of the lever bar 15 in raised position with respect to its end connected to the sprin 16.

Adjacent the other end of the ase B with respect to the post 10 there extends upwardly a pair of supporting rods 20, said rods being threaded at their upper ends through what may be termed a crucible table generally indicated by the reference character T. Also it should be noted that the lower ends of the rods 20 are turnably supported by the platform .13 and their upper ends are threaded so that the crucible table T may be lowered or raised. The rods 20 support the one end of the crucible table T and as shown one is located adjacent each side thereof while the post 10 supports the other end of the crucible table T. The end of the crucible'table associated with the post 10 is formed with a suitable recess through which the post 10 may pass, said recess being centrally of the one end of the table and upon the post there is carried a collar 21 which is positioned beneath the table T and adjustably held by a set screw 22 so that this end of the table may be raised or lowered, the same as the other end thereof in the manner previouslydcscribed.

At a point intermediate the ends of the crucible tableT there is formed a suitable recess in which there is positioned'a grid generally indicated by the reference numeral 23, said grid as shown in Figures 1 and 4, comprising a ring 24 having formed therewith radial plates which extend from its inner periphery to a point in close proximity to the center of the ring. The ring 23 is preferably slightly greater in thickness than the crucible table T and also the upper edge of the ring slightly projects above the radial plates \Vithin the ring 24 there is fitted a cylindrical crucible 26 and about the lower end of the crucible 26 is a sheeting of asbestos 27, said asbestos being. secured to the table by means of rivets or the like as at 28.

Within the crucible 26 there is positioned suitable sectional molds 28 which are adapted to form a casting cavity as at 29, said casting'cavity communicating with the upper surface of the molds through an orifice 30; It will also be observed that .the upper surface of the molds 28' are slightly dished as indicated at 31.

A cap 32 is provided which is adapted to fit upon the cylindrical crucible 26 and form a tight closure therefor. The head portion of the cap 32 is provided with a cylindrical extension In the form of the invention shown in Figure lthis cylindrical extension is partially solid and is fitted in a suitable recess formed transversely of the enlarge: ment 18 of the lever bar 15 and adapted to retain the cap 32 in this position.

Referring to Figure 3 it will be seen that the cylindrical extension 33 is hollow to provide a passage 34 which communicates with the interior of the cap 32. Also it will be seen that a plug generally indicated by the reference numeral 35 is extended into the passage 34, said plug terminating at its outer end in a stop-cock 36 having formed therewith a pressure gage 37. The stopcock 36 is in turn connected to a flexible hose 38 and valve 39, and said valve 39 with a tank 40 adapted for retaining air under pressure.

the crucible table T is formed at its one end with a reduced extension 43 through which the post 10 passes, and said extension also carries a set screw 44 by which the extension 11 is adj ustably held within the post 10. Also in this instance the grid is generally indicated at 45 and is of slightly different construction than specifically shown in Figure 4, said grid comprising a ring (not shown) which is formed wit-h the spokes 46.

In the operation of the device shown in Figures 1- and 2, the gold or other material which is to be used in forming a tooth is to be placed on the mold in the dished surface 31 and then the heating thereof begins. It is of course assumed that the lever bar 15 is in its raised position and so held by the spring 16. The gold or other material will melt and drain into the cavity 29. After the cavity 29 has become filled'then Wet closing the upper end of the crucible 26;

This wet paper will force the fused metal or porcelain into the cavity 29 so that the tooth formed wiil be free of imprisoned air or fissures.

. In case that'a. different sized mold or cru cible is used then the crucible tables T may be adjusted to suit the same by manipulating the bolts 20 for raising or lowering the one end of the table and adjusting the collar 21 for raising or lowering the. other end of the table. Also if necessary the distance of the lever bar 15 above the crucible may be adjusted by means of the set screw 12.

I In the use and operation of the device shown in Figure 3 the operation is carried on as described for Figures 1 and 2 up to the point when it is desired to force the fused metal or porcelain within the mold cavity 29. The cap 32 is brought into position as shown in Figure 3 and then the stopcock 36 is opened by the links 35' and 36 and air is permitted to enter the top of the cap with the result that the same air will force the fused metal into the mold cavity and eliminate the possibility of fissures or the like in the tooth formed. Also by this arrangement the pressure of air may be ascertained by the gage 37 and the air may' be shut off and turned on from the tank 40 by the valve 39.

Referring to Figures 6 and 7 the table, in each instance, generally indicated by the letter T consists in a section of sheet iron preferably rectangular in shape. In Figure 6 the table is shown as being formed with a circular opening centrally thereof as at 47 and the pair of enlarged arcuate shaped recesses 48. In Figure 7 a similar central and circular opening 49 is formed in the table T recast? I and a plurality of openings 50 are positioned about the opening 49 preferably in the manner shown. In Figures 8, 9 and'10 the casting ring, in each instance is gener ally indicated by the reference numeral 51, and as shown, consists in a hollow shell tapering toward its lower end. In Figure 8 the shell is shown as formed with a rib 52 adjacent its upper end, while in Figure 9 a similar rib 53 is shown as being formed intermediate the ends of the shell andupon the exterior surface thereof. In Figure 10 the same rib as at 54 is shown as being positioned adjacent the lower end of the shell. Also in Figure 11 a similar casting ring 51 is shown and in this instance intermediate the ends of the ring there is formed upon the exterior surface thereof a plurality of circumferentially spaced lugs 55.

As is obviouseither of the casting rings shownjin Figures 8 to 11 inclusive may be used upon either of the crucible tables shown in Figures 6 and 7 by positioning the same in the openings 47 and 49 respectively. The purpose of positioning the supporting rib for each casting ring differently is that they may be inserted within the openings 19 or 17 of the crucible tables at different depths.

In Figure 12 there is shown a. casting ring of the type shown in Figure 9 and said ring being seated in a receiver pan generally indicated by the reference character 56. This receiving pan 56 tapers toward its lower end and is formed at its upper end with an outwardly projecting flange 57 upon which the rib 53 of the casting ring may seat. The bottom 58 of the receiver pan 56 is formed with a plurality of circular openings 59 in order that the flame may pass upwardly therethrough and within the casting ring seated therein.

Also it may bementioned that the opening 48 shown in the table 6 is for the purpose of permitting the flame to pass ,upwardly and about the casting ring and about the openin 50 shown in the Figure 7.

tet'erring to Figures 14 and 15, the base B in this instance, has two posts 10' extending upwardly therefrom which corresponds in construction to the post 10 shown in Figures 1 and 3, that is, each post is hollow and provided with an extension 13, said extension being slidable within the upper end of the associated post. Also each post is provided with a set screw 12 whereby the extension 13 may be adjustably secured. The table T is supported at its one end in the same manner, as in Figures 1 andl3, that is, by the adjustable rods 20 and at its other end between the pair of posts 10. The table T has formed adjacent one end a pair of lugs 9. one for each of the posts 10, and each lug being formed with an opening permitting the associated post 10 to slide therethrough.

Also each lug has threaded therethrough a set screw 8 whereby the table 7 may be adjustably held at its one end by the post 10'. Between the upper ends of the post 10 there is turnably supported a cross head 7, and through said cross head 7 there extends the forward end of the lever 15 whereby to fulcrum said lever. The lever 15 isconnected with the base B through the means of a coil spring 6, said coil spring being connected at its lower end or to the base by the means of a hook 5. The construction of the dental casting machine shown in these two figures, namely 14 and 15, is otherwise the same as shown in Figures 1 and 2, and it is thought that the operation of this modified form of invention will be clearly obvious without detailed description thereof.

While I have shown and described the preferred form of my invention, I wish it to be understood that I am aware of the fact that the construction, combination and arrangement of parts may be changed by thoseskilled in the art without departing from the spirit of the invention as indicated. by the appended claims.

What I claim is:

1. In a device of the character described comprising in combination, a base, a table supported by said base in spaced relation thereabove, a crucible supported by said table, means for applying a melting heat to said crucible, molds within said crucible whereby the tooth may be cast, a post extendin upwardly from said base, a lever bar in crumed by said post, a cap carried by said lever bar adapted to be brought to form a closure for said crucible when said handle bar is brought in proper position, means connected with said handle bar to yieldingly hold the same so that the cap is normally dis osed above said crucible, and

means where y the table may be adjustably raised and lowered.

2. In combination, a crucible table of the character described, comprising a sheeting of metal having formed centrally thereof a circular opening, a receiving pan cylindrical in shape and tapering toward its lower end adapted to slide within said openin a flange formed about the upper end of said receiving pan and adapted to engage the crucible ta le and seating the receiving pan, and a casting ring adapted to fit within said receiving pan.

3. In combination, a crucible table of the character described, comprising a sheeting of metal having formed centrally thereof a circular opening, a receiving pan cylindrical in shape and tapering toward its lower and adapted to slide within said opening, a flange formed about the upper end of said receiving pan and adapted to engage the crucible table and seating the cylindrical pan, a casting ring adapted to fit within post extending upward said receiving pan, and means formed upon the exterior of said casting ring adapted to support the same in spaced relation with the lower end of said receiving pan.

4. In a dental castin machine, a base, a

fy from the base adjacent the one end thereof, a pair of rods extending upwardly adjacent the other end of said base, said rods being adapted to be rotated for raisin and lowering the same, a table supportef between said rods and post, said table being adjustably secured to the post whereby 1t may be raised and lowered, a lever bar fulcrumed upon said post, a crucible supported by said table carrying a mold, and a cap carried by said lever bar and adapted to be brought into position for engaging said crucible and mold.

5. In a dental casting machine, a base, a post extending u Wardly from the base adjacent the one en thereof, a pair of rods extending upwardly adjacent the other end of said base, said rods being adapted to be rotated for raising and lowering thereof,

a table supported between said rods and post and said table being adjustably secured to the post whereby it may be raised and lowered, a lever bar fulcrumed upon said post, a crucible supported by said table carrying a mold, a cap carried b said lever bar and adapted to be brought into position for engaging said crucible and mold, a valve carried by said lever bar whereby compressed air may be injected into the mold upon the cap carried by the lever bar being lowered thereon, and means for automatically opening the said valve when the lever bar is brought to its lowered position.

6. In a dental casting machine, a base, a post extending upwardly from the base adjacent the oneend thereof, a pair of rods extending upwardly adjacent the other end of said base, said rods being adapted to be rotated for raising and lowering thereof, a table supported between said rods and 0st and said table being adjusta-bly secure to the post whereby it may be raised and lowered, a lever bar fulcrumed upon said post, a crucible supported by said table carryin a mold, a cap carried by said lever bar an adapted to be brought into position for engaging said crucible and mold, a valve carried by said lever bar whereby compressed air may be injected into the mold upon the cap carried by the'lever bar being lowered thereon, means-for automatically opening the said valve when the lever bar is brought to its lowered position, and a link connection between the post and valve whereby the valve will be automatically opened upon the lever bar assuming its lowered position.

7. Incombination, a crucible table of the character described, consisting in a section of metal sheeting having formed centrally thereof an opening, other openings formed about the first named opening, a casting ring adapted to slidingly project into said opening, and means on said castingring adapted to seat the same upon said crucible table.

SAMUEL LIONEL JEFFERIES.

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