US655402A - Alloy for antifriction-bearings, &c. - Google Patents

Description

Grain STATES PATENT OFFicn.

JOSEPH G. HENDRIOKSON AND GUILLIAM H. OLALWIER, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNORS TO THE AJAX METAL COMPANY, OF SAME PLACE.

ALLOY FOR ANTlFRlCTlON-BEARINGS, 84.0.

SPECIFICATION forming part Of Letters Patent No. 655,402, datedAugusfi 7, 1 900.

Application filed March 7, 1900. Serial No. 7,714. (No specimens.)

To all whom it may concern.-

Be it known that we, JOSEPH G. HEN- DRICKSON and GUILLIAM H. CLAMER,citizens of the United States, residing at the city of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented a certain new and useful Alloy for Antifriction- Bearings and the Like, of which the following is a specification.

One object of the present invention is to fill a recognized want and provide an alloy for journal-bearings which shall hold up within itself more lead than was heretofore possible without the use of nickel,which is claimed in our applications serially numbered 737,304: and 7 37 ,305.

It is generally known by those skilled in the art that the lead in a copper, tin, and

lead alloy is only mechanically held, while the copper and tin are not a merely mechanically-mixed alloy nor a simple solution of the one in the other, but in certain proportions they are a chemically-constituted compound, and if an excess of either one or the other constituents is present there will remain one or more not chemically-combined ingredients outside of the crystallized chemically-combined constituents. The elements tin and copper when brought together in the molten state combine to form several welldefined compounds, such as SnOu SnOu SnOu, according to the amount of tin present. Any excess of tin above that required for the formation of these compounds will mix with the copper to form the so-called eutectic alloy. This part of the alloy has a much lower melting-point than any of the chemically-combined crystallized portions and acts as the cementing material. The first of the compounds solidifies in the mass at a temperature between 1,700 and 1,800, and the eutectic alloy being rich in tin and having a formula of seventy-three parts copper and twenty-seven parts tin does not solidify until the mass has cooled to about 930 Fahrenheit. We have discovered that a much higher percentage of lead,which is desirable,

can be added to such alloy containing less than seven per cent. of tin than can be added to such alloy containing more than seven per cent.of tin, because the alloy containing less than seven per cent. of tin when poured,for example, into green-sand molds contains very little or none of the eutectic alloy. Oonse quently the whole mass will solidify at a comparatively-elevated temperature and in so do= ing will hold up the lead, so that a comparatively-large proportion of it, as more than twenty per cent, may be introduced without separation.

To make our improved alloy, the copper is heated and melted until it is thoroughly liquid. The tin and lead are then added in the proportions of under seven per cent., by weight, of tin and not less than twenty per cent, by weight, of lead. The alloy is then cast in suitable molds, which may or may not be of green sand.

We are aware of the fact that our alloy may be built up by the use of brass scrap which, as is well known, may contain, in addition to copper, antimony, zinc, iron, arsenic, phosphorus and bismuth and any and all soft metals in varying proportions.

It will be obvious to those skilled in the art to which our invention appertains that modifications may be made in details without departing from the spirit thereof. Hence we do not limit ourselves to the precise mode of procedure hereinabove set forth; but,

Having thus described the nature and objects of our invention,what we claim as new, and desire to secure by Letters Patent, is-

A bearing consisting of less than seven per cent. of tin and more than twenty per cent.

of lead and the balance of copper, substan-- tially as described.

In testimony whereof we have hereunto signed our names.

JOSEPH G. HENDRIOKSON. GUILLIAM H. OLAMER. Witnesses:

W. R. Woo'rnRs, LOUIS P. DOERING.