US759567A - Brake-shoe. - Google Patents

Description

PATENTED MAY 10, 1904. A. L. STRBETER.

BRAKE SHOE.

APPLICATION MAR. 2. 1903.

i hll Jmie 7 5 1 Weak? I UNITED STATES Patented May 10, 1904.

PATENT OFF CE.

ALFRED L. STREETER, OF CHICAGO, ILLINOIS, ASSIGNOR TO AMERICAN BRAKE SHOE & FOUNDRY COMPANY, OF NEW YORK, N. Y., A GOR- PORATION OF NEW JERSEY.

BRAKE-SHOE.

SPECIFICATION forming part of Letters Patent No. 759,567, dated May 10, 1904.

Application filed March 2, 1903.

To all whom it may concern.-

Be it known that I, ALFRED L. S'rnnn'rnn, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Brakershoes, of which the following is a specification.

My invention relates to the brake blocks or wearing soles of the brakes in common use upon railway cars, and particularly to the cast shoes designed to wear down to the supports therefor, and having strengthening means on the back in order to prevent them from easily breaking into pieces when worn thin. The 5 objects of the invention are to provide a superior backing of malleable metal which can be easily cast into the shoe, to provide a backing requiring the least possible amount of malleable metal to perform the functions and to use the common and cheap material which is found on the market already in condition to be put in place, and to provide superior means for holding the backing in place, properly proportioning the parts thereof and giv- 5 ing them a secure hold upon the shoe.

To attain these objects, and other advantages which will hereinafter appear, I prefer the construction illustrated in the accompanying drawings, wherein- Figure 1 is a side elevation of the shoe, and Figure 2 a plan of the same.

Figure 3 a cross section taken on the line (3) in Figure 2.

Figure 4 is a cross section taken on the line (4) in Figure 2.

Various forms of malleable metal structure have been used as backing for cast shoes, and various methods of attaching the backing have been employed; but they have not been eco- 4 nomical, because more metal than was really necessary was applied in some places and less than necessary in others. Again, there has been difiiculty in so attaching the backing to the shoe as to give it proper connection there to Without wasting a good deal of the cast metal.

I prefer to use a series of malleable iron or steel rods, having somewhere on their length Serial No. 145,643- (No model.)

a projection or enlargement which will prevent their moving lengthwise in the cast metal, and I find it very convenient to use the common spikes or nails found ready to hand in the market. The body of the shoe 5, is provided with a series, commonly live in number, of such steel spikes 10, embedded for about two-thirds of their diameter in the back of the cast metal shoe, as shown. They may conveniently be arranged with a pair on each side of the central lug 7, and having their heads buried in the extreme end lug 6, of the shoe, and an additional spike between these four and running underneath the attaching lug 7. The heads 11, of the spikes will prevent their longitudinal displacement in the metal in case of breakage of the shoe when thin, and it will be noted that by this arrangement there are three rods near the center of the shoe where there is most danger of breaking, and but two near the outer ends where there is less danger, while the ends of the shoe which are in contact with the holding frame are securely held to the body of the shoe by two embedded heads of the spikes. In order to properly secure the spikes in their proper places, without the necessity of entirely embedding them and therefore placing them nearer to the face of the shoe than is desirable and wasting the cast metal, I provide on the back of the shoe a series of holding lugs, 8, 9, as shown.

In the manufacture of the shoes this use of common spikes is found very convenient, because they may be gotten easily and readymade, of uniform size and quality, and at any time; and in manipulating the mold they are very convenient, since it is necessary merely to lay themin place in the bottom of the mold after the latter is finished and properly embed them by slight pressure of the finger. The economy of their use, both in cast metal and malleable metal employed, will readily occur. And the advantages of the structure will also be apparent, since it is plain that the required strengthening material on the back of the shoe is placed in exactly the position where it is most needed, and does not interfere with the complete Wearing out of the shoe itself, thus saving a large proportion of the cast metal.

Having thus described my invention and illustrated its use, What I claim; and desire to secure by Letters Patent, is the following:

1. A cast brake shoe having a malleable metal backing composed of a series of short rods overlapping in length and provided with enlargements or projections thereon to prevent their longitudinal displacement, substantially as described.

2. A brake shoe having a backing composed of a series of rods of less length than the shoeback and so disposed as to overlap one another near the center of the shoe, substantially as described.

3. A brake shoe provided with a backing of steel spikes partially embedded in the metal of the shoe, substantially as described.

4. Acast metal brake shoe havinga backing composed of five malleable metal spikes with heads, partially embedded in the back of the shoe, and overlapping one another near the middle of the shoe.

5. A brake shoe provided with a series of strengthening rods on the back of the shoe and cast Within a series of lugs thereon, each rod being provided With means thereon to prevent longitudinal displacement.

6. A brake shoe havinga malleable backing consisting of rods extending along each side of the central lug near the edge of the shoe and a short rod placed near the center of the shoe and extending under the central lug, all

said rods being embedded under lugs projecting from the back of the shoe.

In testimony whereof I have hereunto signed my name in the presence of the subscribed Witnesses.

ALFRED L. STREETER.

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