US374272A - Brake-shoe - Google Patents

Description

(No Model.)

\ G. M. SARGENT.

BRAKE SHOE. No. 374,272. Patented Dec. 6,1887.

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N4 PETERS, PnoIoLimugnpher. wamington. D. C.

UNITED STATES PATENT OFFICE.

GEORGE M. SABGENT, OF CHICAGO, ILLINOIS.

BRAKE-SHOE.

SPECIFICATION forming part of Letters Patent No. 374,272, dated December 6I 1887.

Application filed October 2l, 1887. Serial No. 253,011. (No model.)

To @ZZ whom it may concern,-

Be it known that I, GEORGE M. SARGENT, a

citizen of the United States, anda resident of Chicago, Cook county, Illinois, have invented certain new and useful Improvements inBrake- Shoes, of which the following is a specification.

This invention relates to an improvement upon what is known to the trade as the Boss BrakeShoe7 which brake-shoeisdescribedin Letters Patent No. 292,861, dated February 5, 1884, and the distinguishing feat-ure of which consists in so forming the friciion'face of the shoe as that it shall have wearing portions which bear upon those parts of the tread and liange of the wheel least subject to wear by the rails, with an intervening groove over the part of the wheel-tread most worn by contact with the track.

Heretofore such brake-shoes have been made of all castiron and also of all steel.l All-cast iron brakeshoes have many well-known objections, and are being largely discarded by the leading railroads of t-he country. On the other hand,all-steel brake-shoes are expensive, and when worn out can only be used for scrap, which is much less valuable than the scrap from the cast-iron-brake-shoes.

To make a brakeshoe possessing` all the commercial advantages of an all-steel shoe at a greatly reduced cost,and one which shall, when worn out, be more valuable as scrap than such steel brakeshoes, is t-he object of this invention, which consists informing the wearing portions of the Boss brakeshoe of steel, cast or rolled, or malleable iron suitably secured to a cast-iron back, as ywill be hereinafter more fully described.

I am well aware that itis not new to embed steel blocks in a cast-iron back cfa brake-shoe, such having` been patented to I. H. Congdon March 21,1876, by Letters Patent No. 174,398, his invention having since been followed and modified by others; but I am the iirst to have supported two parallelly-arranged and sepa rated steel or malleableiron friction or wearing blocks in a cast-metal back, the arrangement being such that the said strips shall be opposite those portions of the wheel least affected by the rails, while that part of the brake shoe between such steel wearing-faces shall be of cast-iron. My invention may be better understood, however, by reference to the accompanying drawings, in which- Figure l is a perspective view of a Ross brake-sh oe with my invention applied thereto. Figs. 2, 3, and 4 are transverse sectional views of the same, illustrating slightly different methods of uniting the steel faces to the castiron back. A

In such drawings, A represents the cast-iron bach; B, the longitudinal steel strip or n1alleableiron, adapted to bear against the inner tread portion of the wheel, and B the longi tndinal strip, lying in the groove c of the shoe and adapted to engage the Yliange of the wheel. Between these two strips, in the construction shown in Figs. l, 2, and 3, is a groove, c, adapted to lie over about the central portion of the tread of the wheel, this groove being of any desired depth and backed by cast-iron.

The blocks B B are first formed in any desired manner, and then placed in the molds, when the back A will be cast around them. One method which I may employ in shaping these blocks or strips B B is to roll a compara tively long bar of steel or malleable iron into approximate form,and as soon as the bar leaves the rolls cut itinto proper lengths, which are then immediately placed in a former or die, where they are completed, being given the desired curve, die. The steel portions may be united to the back in any of the well-known methods of uniting steel and cast-iron.

In Figs. l and 2 the steel blocks are provided with apertures, preferably of tapering form, through which the cast metal flows.

In Fig. 3 the block B is provided with lugs or a longitudinal rib, which enters the cast metal, while the block B is provided with depressions,into which passes the molten metal.

In Figs. 2, 3, and 4 the blocks B' are shown of different sizes and forms, either of which may be used as may be found most desirable.

The relative size of the strips B B is such that when the shoes are so worn as to become useless they will have been all worn away, when the part remaining may be utilized as cast-iron scrap, thus rendering the remnants ofthe shoes when constructed according to my processv more valuable than were the shoe all steel. The groove e might, under soine circumstances, be dispensed with and the cast metal be Hush with the steel wearing-faces, as shown in Fig. 4. In such ease the effect would 5 be that there would be less wearing of the wheel over the parts which engage chiefly with the rails by reason of the east-iron only, which wears away more readily, bearing against that part of the wheel.

to I claim- 1. A ear brake-shoe having two parallel steel or malleable-iron wearing-strips extending longitudinally of the shoe,.and a east-iron baek, in which said strips are seated, substan i 5 tially as described.

2. A car brake-'shoe provided with a groove,

c, adapted to the wheel-Harige, having two parallel steel or malleable-iron strips, one seated in said groove and the other along the edge of the shoe opposite said groove, and a back of zo east-iron, to which said strips are secured, the portion of the shoe between said steel strips being of cast metal only, substantially as described.

In testimony whereof I have signed my name 25 to this speoication in the presence of two subscribing witnesses.

GEORGE M. sARGENT.

Witnesses:

J. C. Davis, WM. D. SARGENT.

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