US1290250A - Apparatus for casting gold inlays. - Google Patents

Description

A. A. LAWRY.

APPARATUS FOR CASTING GOLD INLAYS.

APPLICATION FILED JUNE 4, I918.

Patented Jan. 7, 1919.

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ARTHURA. LAWRY, 0F VALIDOSTA, GEORGIA.

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Specification of Letters Patent: Patented Jan. 7, 1919.

, y Application filed June 4, 1918. Serial No 238,154.

Apparatus for Casting Gold Inlays; and I i do hereby declare the following tobe a full, clear, and exact description of the invention, such as will enable othersskilledin the art to which it appertains to makeand use the i by screws 7 to thetop piece or section. The

same.

, This invention relates to an improved apparatus for casting gold inlays. Oneof the objects of the invention is to provide an improved machine or apparatus of this kind, in which the force of gravity is utilized. e

A further-object of the invention is to provide an improved, simple, efficient and practical machine of this kind, ,which, may be manufactured at a small cost and ,sold at a reasonable profit.

One of the features of the invention consists in the provision of a frame, a forked lever pivotally mounted thereon, and an inlay investment cup, adapted to cooperate with a receiving cup containing moistened material, whereby the steamgenerated from the heat of the metal, adapted, to be contained in a conical container, may force the metal through an orifice in the bottom of the container, into a form in the inlayinvest-l.

improved machine constructed in accordance with the invention.

Fig. 2 is a plan view.

Fig. 3 is a longitudinal sectional view on line 3--3 of Fig. 2.

Fig. 4: is a transverse sectional view on line Jr-4: of Fig. 2.

Fig. 5 is a detail View of a container or holder, which at one time may hold the wax inlay and at another time contain the gold for forming the inlay.

Referring more especially to the drawings 1 designates the frame of the machineas a whole which comprises a base 2, and anarch portion 3. This arch consists of the side standards 4 and a top piece 5. The side standards are secured to the longitudinal edges of the base by means of screws 6 while the upper ends of thestandards are secured upper face of the base 2 and the inner faces of the side standards, and the under face of the top section are linedrespectively with pieces of asbestos 8, 9 and 10. A suitable receiving cup 11 is secured by screws 12 to the under face of the asbestos piece 10 ofthe top section 5. The inner cylindrical wall of the receiving cup. is provided with an annular r1b 13. This receiving cup s designed for the receptlon of any sultable moistened ma terial 14:,such as moldine, which is composed principallyof a kind of clay worked with glycerin. The annular rib ,13 constitutes means to retain the moistened material in ,Stlld receiving cup. A forked standard 151s secured by screws 16 t0 the, base whereby it may, extend vertically. t A lever 17 is pivoted by means of thepin 18between the forks of said standard 15. A guide bracket 19 is also secured to the base by. meansof the screws 20, with the asbestos piece 8 between the guide bracket and the base 2. This bracket comprises upstanding guide arms 21, between which the longer arm 22 of the lever 17 is guided. The extremity of the longer arm terminates in forks 23, in bearings of the extremities of which the laterally extending diametrically arranged axially alined pins 24: of the inlay investment cup 25 are fulcrumed, so that when the shorter arm of the lever is depressed, the inlay investment cup will uniformly engage the moistened material or moldine in the receiving cup. In constructing or molding gold inlays, the cavity is first ground and cleaned, after which a wax impression is taken of the cavity. The inlay investment in the cup 25 is then heated to a softened condition. The wax impression of a cavity is then mounted in the usual manner upon a pin (not shown), but which may be supported in the orifice 2-6 of the holder 27. The holder is then mounted upon the investment cup, so that the wax impression may extend into the inlay investment. The inlay. investment is then allowed to harden and subsequently to which,

the wax impression is then melted by heat from any suitable source, preferably a blow torch, and then removed, thereby forming a cavity in the investment corresponding in shape and configuration to that in the tooth. The pin, which is supported in the orifice 26, having first been removed, and the gold which is placed in the conical concavity 28 of the holder 27,'is brought to a molten state by applying heat thereto from any suitable source preferably blow-torch, whereby the molten gold may pass through the orifice 26 into the cavity of the investment to form the inlay. The short arm of the lever 17 is then depressed, whereby the marginal edge of the investment cup is brought into uniform contact with the moistened mat'erial'or moldine in the receiving cup, and through the medium of steam pressure generated from the heat from the molten metal on the moistened material, the gold in the holder is forced through the orifice 26 into the cavity of the inlay investment, whereby a gold inlay suit able to enter the cavity of the tooth is constructed or molded.

The invention having been set forth what is claimed as new and useful is 1. In a machine for moldinggold inlays, the combination with a frame having an arch part, of a receiving cup containing moistened material secured to the under part of the arch, of a gravity lever pivotally mounted upon the base of the frame, and an inlay investment cup fulcrumed upon the gravity actuated end of said lever, to cooperate with the moistened material of the receiving cup, for forming gold inlays.

52. The combination with a frame comprising a base and an arch portion, of a lever provided with a gravity actuated end pivotally mounted upon the base, guiding means for the gravity actuated end, an inlay investment cup fulcrumed on the extremity of the gravity actuated end, a receiving cup secured to the under face of the arch and adapted to contain a moistened material, with which the inlay investment cup uniformly engages, whereby gold inlays are molded through the medium of steam pressure.

3. The combination with a frame comprising a base and an arch portion, of a lever provided with a gravity actuated end pivotally mounted upon the base, guiding means for the gravity actuated end, an inlay investment cup fulcrumed on the extremity of the gravity actuated end, a receiving cup secured to the under face of the arch and having on the inner circumference of the cyliir drical wall an annular rib for retaining therein a moistened material, withwhich the inlay investment cup uniformly engages, whereby gold inlays are molded through the medium of steam pressure, the upper face of the base and the inner upper and side walls of the arch being respectively lined with asbestos to avoid excessively heating the frame.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ARTHUR A. LAW RY.

Witnesses C. L. SMITH, JUNE BLOLOCK.

Copies of this patent may be obtained for five cents each, by addressing the "Commissioner of Patents. Washington, D. 0.

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