US317843A - Simon obermayer - Google Patents

Description

UNITED STATES,

PATENT OFFICE.

SIMON OBERMAYEB, OF CINCINNATI, OHIO.

COMPOUND FOR MO LDERS FACINGS.

.QEPECIE'ICAI'ION forming part of Letters Patent No. 317,843, dated May 12, 1885.

Application filed July 26, 1884.

To all whom it may concern: Be it known that I, SIMON OBERMAYER, a

citizen of the United States, residing at Oincinnati, county of Hamilton, State of Ohio, have invented certain new and useful Improvements in Compounds for Molders Facings, of whichthe followingis a specification.

The object of my invention is a compound for facing molds for steel and iron castings, that will prevent the molten metal from cutting into the mold, and insure smooth sharp castings which are easily cleaned.

My compound consists of ground asbestus, East India or Ceylon plumbago or graphite, and carbon. The proportions usually employed, and which give the best general results, are about one part, by weight, of ground asbestus, one part graphite, and five parts of carbon. By carbon I mean also charcoal, anthracite coal, coke, 8m. The parts are ground fine and mixed in the usual way other facing compounds are mixed. The compound is dusted on the mold for green-sand molds, and is used as a wash for dry sand and loam molds.

The proportions above given are for iron castings of light or medium weight. When the castings are heavy, I use less carbon and asbcstus and more plumbago. The proportions are also varied according to the nature of the sand andiron. If the sand is wet or very open, I add more carbon and less plumbago, and if the metal is soft fluid iron I use less asbestus. If, however, the iron is rough or tough, I use more asbestus and plumbago in proportion to the carbon.

(No specimens.)

For steel castings the proportion of plumbago is less. To produce the best results for steel, and, in fact, for all castings, the parts mixed in equal proportions will give the best results, but for ordinary work the cost would be too great. The proportions heretofore given will give good results, and will also be comparatively inexpensive.

As molder-s sand varies in different localities,and as the metals also vary in quality and property, no exact proportions can be given for the ingredients of any facing compound that will give the best results in every case; but any skilled molder will be enabled from the foregoing description to use my invention to the best advantage with the materials he has at hand and the character of the work he is required to produce.

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

l. A molders facing compound consisting of asbestus plumbago, and carbon, substantially as hereinbefore set forth.

2. A molders facing compound consisting of asbestus, plumbago, and carbon, in about the following proportions, to wit: asbestus, one part; plumbago, one part; and carbon, five parts, as hereinbefore set forth.

SIMON OBERMAYER.

Witnesses:

GEO. J. MURRAY, BART KANE.