US716984A - Brake-shoe. - Google Patents

Description

No. 716,984. Patan'ted Dec. 30, 1902.

- n. L. snow":

BBAAKE sum-z.

(Application filed Feb. 24, 1902.)

(No Model.)

vide a soft-metal body with a relatively hard e UNITED STATES PATENT OFFICE.

RUDOLPH L. BROWN, or CHICAGO, ILLINOIS.

BRAKE-SHOE.

SPECIFICATION forming part of Letters Patent No. 716,984, dated December 30, 1902.

' Application filed February 24, 1902. Serial No. 95,351. ,(llo model.)

To all whom it may concern:

Be it known that I, RUDOLPH L. BROWN, a citizen of the United-States, residing at Ohicago,'in thecounty of Cook and State of Illinois, have invented certain new and useful Improvements in Brake-Shoes, of which the following is a specification.

This invention relates to novel improvements in brake-shoes, and has for its object to provide a brake-shoe of high braking efficiency which will not wear or dress the wheel at that part thereof whichis worn by the rail.

Another object of the invention is to prometal insert of novel construction and arranged in the wearing-face of the shoe opposite that part of the wheelwhich is worn by the rail.

With these and otherjends in view the im yention consistsin the novel construction and arrangement of 'partshereinafter described, and shown in the accompanying drawings, in which- 1 Figure 1 is asideelevation of a brake-shoe embodying the invention. Fig. 2 is a face view of the shoe. Fig. 3 is a sectional view on the line 3 8 of Fig.

Similar numerals of reference indicate corresponding parts in the several figures of the drawings, and, referring thereto, 5 designates the body of the shoe, which is preferably made of cast-iron, and 6 is the hard-metal insert, preferably made of what is commonly called wheel-iron and relatively harder than the body of the shoe, but softer than the chilled and steel-tired carwheels. In manufacturing the shoe the body will generally be cast around the insert, and the latter is provided with beveled sides 7 and angula-rly -disposed projections or wings 8 to hold the insert in the body and preventits becoming loose or displaced. The insert is thick enough to last during any ordinary service of a shoe, and it preferably extends nearly to the ends of the bodyand parallel with the sides thereof, as shown. The width of the insert maybe varied, as desired; but itshould be sufficient to prevent wear of that part of the tread of the wheel which is worn most by the rail; but I do not limit myself to any particular size of the insert, although I preferthatit should occupy as much as possible of the wearing-face of the shoe opposite that part of the wheel which is worn by the rail, without, however,weakening the body. The projections 8 are preferably located adjacent to the ends of the shoe in an angular relation to the insert,so as to constitute, with the beveled sides of the insert, asecure fastening for the insertin the body and without forminga material portion of the wearing-face of the. shoe.

Heretofore hard-metal inserts of difierent kinds have been arranged in soft-metal bodies in various ways, but withoutproper' regard to the fact that the rail on which the wheel travels wears the wheel considerably between the flange and the opposite edge. Some of these brake-shoes have been so constructed that they will wear the entire surface of the wheel with which they contact, and none of them, so far as I am aware, has ever been constructed with the view of wearing or dress-- ing the wheel only where it is not worn by the rail. fore, that I arrange the insert in the body of my shoe opposite to that part of the tread of the wheel which is worn by the rail, this insert being of hard'cast metal, whichdoes not wear or dress the wheel, and the body of the shoe on both sides of the insert being made of soft cast metal, which wears those parts of the wheel which are not worn by the rail. To accomplish this result, I prefer to make my insert in the form of a straight hair and arrange it centrally in the wearing-face of the shoe, as shown, because in this position it will lie opposite to that part of the tread of the wheel which is generally worn at the present time; but the particular form of the insert and its arrangement in the body of the shoe may be changed without departing from my invention, so long as it is located opposite to that part of the tread of the wheel which is worn by the rail.

In the embodiment of the invention illustrated in the drawings the body of the shoe extends a short distance beyond each end of the insert, but not enough to constitute a-wearing-face of material extent. It is likewise true that the projections on the insert extend into the body 3 but they are not. of sufiicient area to materially decrease the wearing-face of the body;

It is with this object in view, there-.

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A brake-shoe constructed in accordance with my invention combines high braking efficiency with long service and at the same time wears or dresses the wheel only on that part of the tread which is not worn by the rail, so that the brake-shoe will have a tendency tokeep'the tread ofthe wheel in true condition by wearing it where it is not worn by the rail and approximately to the same extent.

-I do not limit myself to the embodiment of the invention in a brake-shoe of any kind or size nor to any particular proportions or arrangements of its constituent elements, ex.-

cept as hereinbefore specified, and I reserve the right to make all changes in the form,

construction, and arrangement as fairly fall within the spirit and scope of the invention. The body of the shoe is preferably made of ordinary cast-iron and the insert of wheeliron; but I do not limit myself to these particular metals and may use other kinds which will provide a soft body and a relatively hard insert.

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent,- isj 1. A brake-shoe consisting of a soft-metal body and a continuous relatively hard metal insert embedded in the body in the wearingface of the shoe opposite to that part of the tread of the-wheel which is worn by the rail and extending parallel with the sides of the body.

2. A brake-shoe consisting of a soft-metal body and a relatively hard metal insert embedded in the body opposite to that part of the tread of the wheel which is worn by the raila'nd extending approximately from end to end of the shoe parallel with the sides of l the bodyto form a continuous part of the wearing-face of the shoe.

3. A brake-shoe consis body and a relatively hard metal insert centrally disposed in the wearing-face of the shoe and extending approximately from end to end thereof. 1 1

4. A brake-shoe consisting of a soft-metal body and a relatively hard metal insert embedded in the bodyin the wearing-face of the shoe and provided with angularly-disposed projections on its sides and between its ends.

5. A brake-shoe consisting of a body and an insertembedded in the body in the wear-. ing-face of the shoe and extending longitudinally thereof parallel with the sides of the body and provided with anguarly-disposed angularly-disposed side projections.

7. A brake-shoe consisting of a body and an insert embedded in the body in the Wearingface of the shoe and extending approximately from end to end thereof, and oppositely-directed projections on the sidevof the insert between its middle and its ends.

8. A brake-shoe consisting of a body and an insert embedded in the body in the wearingface of the shoe and extending approximately from end to end thereof, and a projection on each side of the insert adjacent -to each end thereof.

' RUDOLPH L. BRowN. Witnesses:

WM. 0. BELT, THOS. L. PARKER.

ting of a soft-metal

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