US1217633A - Composite bearing for wrought-metal structures and method of forming the same. - Google Patents

Description

A. L. PUTNAM. COMPOSITE BEARING FOR WROUGHT METAL ST RUCTURES AND METHOD OF FORMING THE SAME. FILED MAR. 31. 1916.

A PLICATION Patented Feb. 27, 1917.

84400444504 07 602 71/ L Maw/aw 551, )Mm maqwmmb from pressed or wrought metal.

UNITED STATES PATENT. OFFICE.

ALDEN L. PUTNAM, COMPANY,

COMPOSITEBEARING FOR WROUGHT-METAL OF DETROIT, MICHIGAN, ASSIGNOR T0 DETROIT PRESSED STEEL OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

STRUCTURES AND METHOD OF FORMING THE SAME.

Specification of Letters Patent.

PatentedFeb. 27, 1917.

Application filed March 31, 1916. Serial No. 87,952.

To all whom it may concern:

Be it known that I, ALDEN L. PUTNAM, a citizen of the United States of America, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Composite Bearings for Wrought-Metal Structures and Methods of Forming the Same, of which the following is a specification, reference being had therein to the accompanying drawings.

The invention relates to Wrought or pressed metal structures designed for use as working parts and having bearing faces in contact with relatively movable members. It is the object of the invention to obtain a more durable working surface, avoiding necessity of mechanically attaching bushings or bearing plates and maintaining the strength and lightness of the structure.

In the present state of the art many machine elements usually formed from cast metal may be lighter and stronger if formed however, these elements have working surfaces or bearings, it has been found that the w i ought metal is not as well adapted for this purpose as cast metal. In particular cast iron is a much more durable working surface than wrought iron or steel, particularly where the cooperating member is formed of hardened steel. Thus it has been the practice heretofore where working members are formed of wrought metal to provide bushings or woEring surfaces of cast iron or some equally good wearing material. It is necessary, however, to make these bushness to possess the required mechanical strength, and as a consequence the size and weight of the structure is increased, so that the advantages due to the wrought metal construction are to a large extent lost. With my improvement I. have overcome this 'defeet by molecularly uniting or integrating with a wrought metal structure a wearing face of a metal of different character. Specifically my improvement comprises'the fusing on to the*surface of a structure of pressed iron or steel a facing of cast iron.

In the drawings:

Figure 1 is a diagramniatic'elevation illus- Nhere,

ings or wearing surfaces of suiiicient thick trating the manner of re-facing a wrought metal structure Fig. 2 is a cross-section showing a pressed sheet-metal journal bearing interiorly refaced; and I Fig. 3 is across-section thereof.

In carrying out my invention the wrought metal'structure is first fashioned either by pressing, drop-forging or in any other suitable way. As shown in Fig. 2, A is a portion of the cylindrical wall of a sheet-metal piston, and B is aninturned sleeve bearing for engaging the wrist-pin of the connecting rod. WVhere this member is formed of pressed sheet-metal and is used in connection with a hardened steel wrist-pin a poor wearing surface is produced and it is difficult to prevent seizing and cuttingof the metal. By making the sleeve B large and engaging a cast iron bushing therewith the difficulty of wearing surface is overcome but the increased size and thickness of the parts is objectionable. I have therefore solved the difficulty by flowing molten cast iron over the inner surface of the sleeve under sufficient heat to fuse and integrate said metal cast-iron lining, as indicated at C. .The

operation may be performed by use of the oXy-acetylene blow torch, as indicated at D Fig. 1, or byany other source of intense heat. The cast metal may be supplied from a bar E, and when fused and highly heated will integrate with the steel surface. Any suitable flux may be used, such for instance as borax.

I have found that an exceedingly thin coating of thecast metal is all that is required to form a good wearing surface, so that the completed structure is but very slightly increased in weight or in size. erably the pressed metal structure is first bored or machined to a size slightly greater than. that of the-finished bearing, and then this surface-is re-faced as has been described and finally finished to size.

What I claim as my invention is 1. The combination with a wrought metal structure having a portion thereof forming a working bearing, of a facing for said bear ing of relatively high-fusing cast metal molecuiarly integrated therewith.

Pref" 2. The combination with a wrought metal structure having a portion thereof forming a working bearing, of a facing for said bearing formed of cast iron fused thereon and molecular-1y integrated therewith.

3. The combination with a pressed sheetmetal structure having a portion thereof forming a working bearing, of a facing for said bearing formed of cast iron fused thereon and molecularly integrated therewith.

4. The method of forming composite bearings comprising the pressing of sheet iron or steel to the form required, machining the surface and coating the machined surface with a facing of cast iron fused thereon and heated to a point where it will molecularly unite with the sheet steel.

ture to be refaced, and simultaneous application of sufficient heat to the adjacent portions of the cast iron and wrought metal structure to fuse and integrate the same.

In testimony whereof I affiX my signature at Detroit, Wayne county, Michigan, upon this 22nd day of March, A. D., 1916.

a ALDEN L. PUTNAM.

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