US1143494A - Brake-shoe. - Google Patents

Description

A. BRAKE.

BRAKE SHOE.

PLICATION -F|LED nsc .28, 1914.- 1,143,494. '-P&136I1136d June 15, 1915.

ARCHIBALD BRAKE, OF TORONTO, ONTARIO, CANADA.

' BRAKE-SHOE.

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Specification of Letters Patent. Patented June 15, 1915.

Application filed December 28, 1914. Serial No. 879,382.

To all whom it may concern Be it known that I, ARCHIBALD BRAKE, a subject of the King of Great Britain, residing at the city of Toronto, in the county of York, Province of Ontario, Canada, have invented certain new and useful Improvements in BrakeShoes, of which the following is a specification.

This invention relates to a brake shoe of the type in which the body of the shoe is cast on a back of tough steel or malleable iron, and my object is to devise a brake shoe of this type which will be strong, easily made, and in which the lug forms a satisfactory bearing for the key which is used to secure the shoe to the brake head.

I attain my object by forming the back of an integral steel plate which is folded at the center to form a lug of twice the thickness of the plate through which the hole for the key is formed. The top of the lug is upset and flattened to increase the bearing surface for the key and the extent of the engagement of the lug with the cast metal.

The invention is hereinafter more fully described and is illustrated in the accompanying drawings in which Figure 1 is a longitudinal section of a brake shoe provided with my improved back; Fig. 2 a perspective view of the back itself; Fig. 3 a cross section of the brake shoe; and Figs. 4c, 5 and 6 details in side elevation of parts of the back showing different stages in the evolution of the upset top of the lug.

In the drawings like numerals of reference indicate corresponding parts in the different figures.

1 is the back formed of a tough steel or malleable iron. This is formed of a strip of metal having beveled edges 2, and preferably having a series of holes 3 formed therein. Centrally the back is first doubled, and then each part is bent outwardly at right angles a short distance below the bent, so that a lug 4 is formed at the center of the back comprised of two thicknesses of the strip. The strip adjacent the lug is bent downwardly somewhat as shown, and curved into the metal of the lug, so that the surface of the strip adjacent the lug is somewhat below the curved surface in which the upper part of the back lies.

The top of the lug is upset so as to expand it longitudinally of the brake shoe to increase the thickness of the lug at the top, and immediately below the expanded portion the hole 5 for the key used to secure the brake shoe to the brake head is formed.

The increased thickness of the lug due to the upsetting of the upper end gives the lug a greater bearing surface on the key, which prevents undue wear. The greater amount of metal thus secured above the key gives increased strength at this point where the strain is greatest.

Preferably the upsetting is complete as shown in Fig. 6, though the end may be partially upset as shown in Figs. 4 and 5 and a considerable degree of utility obtained.

On the back is cast the body of the shoe, the cast material overflowing the beveled edge of the back and extending up through the holes 3. Lugs 6 are cast at each side of the shoe, which embrace the ends of the lug 41- as shown particularly in Fig. 1. The upset upper end of the lug 4 gives the lugs 6 a better engagement with the cast metal than if the lug 4: were of the same thickness throughout its height.

The brake shoe formed with the back substantially as above described and shown in the drawings will be found to be strong and durable, and also easily made.

What I claim as my invention is 1. A back plate for brake shoes comprising a metal strip doubled at the center and bent to form an upstanding lug of two thicknesses of the strip, the top of the lug at the bend being upset to give the lug a greater thickness at that point, and a hole for a key being formed through the lug below the upset top portion.

2. A back plate for brake shoes comprising a metal strip doubled at the center and bent to form an upstanding lug of two thicknesses of the strip, the top of the lug at the bend being upset to give the lug 1, Signed at Toronto Can. this 21st day of greater thickness at that point, and a hole Deoember 1914: in the presence of the tWo for a key being formed through the lug undersigned Witnesses.

below the upset top portion, in combination ARCHIBALD BRAKE. 5 with a, shoe body cast on the back and Witnesses:

formed with a lug at each side embracing J. EDW. MAYBEE,

the ends of the lug of the back. i E. P. HALL.

Copies of this patent may be obtained for fine cents each, by addressing the Commissioner of Patents, Washington, D. 0.

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