US1533118A - Metal bearing - Google Patents

Description

Patented Apr. 14, 1925.

UNITED STATES PATENT OFFICE.

JAMES G. KELLY, ALBERT L. PRINGLE, AND HOLMES HALL, SEDALIA, MISSOURI,

SAID PRINGLE ASSIGNOR T0 SAID KELLY AND HALL.

METAL BEARING.

No Drawing.

To all whom it may concern:

Be it known that we, JAMES G. KELLY, ALBERT L. PRINGLE, and HOLMES HALL, citizens of the United States, residing at the city of Sedalia, in the county of Pettis and State of Missouri, have invented certain new and useful Improvements in Metal Bearings, of which the following is a specification.

This invention relates to a bearing metal made of aluminum, tin, and lead, wherein the proportion of tin is greater than of the other metals, in order to give greater body and to insure the desired smoothness and durability of the composition.

In making this bearing metal, it has been found desirable-to use about sixty-six and two-thirds per cent (66 70) of tin, sixteen and two-thirds per cent (16 lead, and sixteen and two-thirds per cent (16 7 aluminum. Thus about two thirds of the entire composition by weight is of tin, and about one-sixth by weight is of aluminum, and about one-sixth by weight is of lead.

These proportions are intended for a high grade and a high speed bearing metal, such as can be used in automobiles, tractors, locomotives, electrical machinery, and the like. The aluminum is used to ive hardness and toughness to the composltion; the tin to give body tovthe whole, and is, also a desirable ingredient because it increases the durability and smoothness of the metal; and the lead is used as a binder to hold the other ingredients together, and makes a more perfect physical union of the whole. The three metals combined in substantially these proportions form a very close-grained metal that is unusually .smooth and very tough, and with entire absence of brittleness and tendency toward crystallization. Crystallization is a common fault in bearing Il'lGlLillS, many of which contain copper,

antimony, or zinc, any of which ingredients causes more or less friction and, therefore, heat, which results in crystallization. The composition of the bearing metal of this invention contains no heat-producing metal or any that causesundue friction.

While the general nature of this composition is one of substantially two-thirds 1 by weight tin, and one-sixth 4;)

Application filed August 20, 1920. Serial No. 404,864.

by weight of each of the other ingredients, yet these proportions may be varied and still come within the scope of this invention and the following claims. For example, in making a bearing metal for heavy tractor engines, for large derricks or steam shovels, or for heavy machines like the"tanks used in the late war, where there is great weight and strain, it possibly would be advisable to increase the percentage of aluminum or tin, or both. On the other hand, for use 1n high speed machines without great weight or friction, it might be advisable to increase the proportion of block tin. Agaln, if used for metallic packing, it would probably be advisable to soften the compo-' sitlon by increasing the proportion of lead and decreasing the proportion of either or both the block tin and the aluminum. If, however, one standard metal for all these different uses were made, the best general results will be attained if the proportions as set forth above are substantially observed.

Having thus described this invention, we hereby reserve the benefit of all changes in form, arrangement, order, or use of parts, as it is evident that many minor changes may be made therein without departing from the spirit of this invention or the scope of the following claims.

We claim:

1. A metal bearing composed of aluminum, tin, and lead, with the aluminum eonstltuting approximately one-sixth A,) of the whole, and the remainder consisting of lead and tin, each being present in substantial amounts but the tin in a predominating quantity. -2. A metal bearing composed predominately of tin together with approximately equal proportions of lead and aluminum, the latter being present in a proportion sufiicient' to harden the alloy without producing a substantial amount of internal friction or crystallization when the bearing is in use.

3. A metal bearin composed of one-sixth aluminum, two-thir s tin and one-sixth lead.

In testimony whereof we hereunto atiix our signatures.

JAMES G. KELLY. ALBERT L. PRINGLE HOLMES HALL.