US848840A - Skimming device for molten metals. - Google Patents

Description

v PATENTED APR. 2, 1907. e. w; MOORE. SK-IMMING'DEVIOE FOR MOLTEN METALS.

APPLICATION ljILBD JUNE 30. 1906.

SW32: I

ms NORRIS nzrsns 50.. WASHINGTON, n. c.

.than its lower edge.

GEORGE W. MOORE, OF BURLINGTON, NEW JERSEYQQ SKIIVHVIING DEVICE FOR MOLTEN METALS.

Specification of Letters Patent.

Patented April 2, 1907.

Application filed June 30, 1 906- Serial No. 324.170-

To all whom it may concern:

Be it known that I, GEORGE W. MOORE, a citizen of the United States, residing at Burlington, in the county of Burlington and State of New Jersey, have invented certain new and useful Improvements in Skimming Devices for Molten Metals, of which the following is aspecification.

This invention relates to a device for automatically skimming the dross from the surface of molten metal while being poured from the crucible or other vessel. Heretofore this skimming has been done, by hand and required the services of an additional man while pouring.

My object is to hold this dross and other foreign substances in the vessel automatically, and I accomplish this by placing in the crucible a loosely-fitting ring which floats on the surface of the metal and catches and holds all such foreign substances, allowing only the pure metal to flow from the vessel.

My invention is more fully described in the following specification and clearly shown in the accompanying drawings, in which Figure 1 is a side elevation of my device. Fig. 2 is a sectional View on line X X of Fig. 1. Fig. 3 is a plan view of a crucible with my device in position therein. Fig. 4 shows a modified form of my device.

The numeral 1 designates a circular or annular ring. This ring comprises my entire device. The ring is made of a composition of plumbago of the required quality to withstand immersion in molten metal.

The outer wall of the ring is tapered out wardly from the bottom, (see numeral 2,) making its upper edge greater in diameter This taper approximates the internal taper of an ordinary crucible used for pouring molten metal. The inner wall of the ring is made parallel with the outer surface for approximately one-half of its heightthat is, from the bottom to about the middle thereof. (See the numeral 3.) From this pointthat is, about the middleto the top surface of the ring the wall is tapered inwardly at an angle to the surface 3, forming two oppositely- tapered surfaces 3 and 4, and forming a pocket or depression 5 around the inside of the ring at its center.

The ring is placed in the crucible on the surface of the molten metal, where it will float partially submerged, and when the ves sel is tilted to pour its contents the ring will float to the point of outlet and contact with the mner wall of the vessel at that point.

The ring is slightly smaller in diameter than the inside diameter of the vessel.

When the metal is poured, the liquid portion will pass freely between the ring and the wall of the vessel at the outlet or lip; but all dross and floating foreign substance will be caught and retained on the inside of the ring, the pocket 5 serving to increase the efficiency of this retarding action, the inner wall being so formed that all danger of the dross passing over its top edge is overcome, a portion of the ring always projecting above the surface of the metal.

When the vessel is emptied of its contents and the ring has descended to the bottom thereof, it is not necessary to remove it; but the vessel may be refilled, as the ring will assume its position on the surface of the metal and be ready for the next pouring.

It is evident that my device may be made of varied sizes and shapes and that the particular formation of the pocket or inner wall may be changed, as shown in Fig. 4, where l the wall is shown curved inwardly toward the top.

The body of the ring is reinforced by having a binder of asbestos in the form of a flat band or ring 6 cast therein.

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is

1. The combination of a molten-metalpouring vessel and an annular ring, smaller in diameter than the inside diameter of said vessel, said ring having its outer surface tapered from the bottom outwardly, its inner surface parallel with said outer surface for the lower half thereof and the upper half of its surface tapered inwardly at an angle to said lower portion forming an annular pocket around the center of said inner wall, substantially as and for the purpose described.

2. As an article of manufacture, an annular ring of plumbago having its outer surface tapered from the bottom outwardly, the lower portion of its inner surface parallel with said outer surface and the upper portion thereof tapered inwardly and at an angle to said parallel portion thus forming a central circumferential depression in the inner wall of said ring.

3. As an article of manufacture, an annular ring of plumbago having an annular band of asbestos cast in the body thereof, said ring having its outer surface tapered outwardly l In testimony whereof I afiix my signature from bottom to top surface, the lower porin presence of two witnesses. tion of the inner surface being parallel with said outer surface and the upper portion ta- I GEORGE MOORE pered inwardly at an angle to the lower por- Witnesses:

tion, substantially as and for the purpose de- ED. A. KELLY,

scribed. J. OR. KELLY.

Images