USRE11746E - pickard - Google Patents

Description

Reissued June 6, 1899. R. WALSH.

BRAKE SHOE (Application filed May 10, 1899.)

WW I

UNITED STATES PATENT OFFICE;

RICHARD \VALSH, OF CHICAGO, ILLINOIS, ASSIGNOR OF ONE-THIRD TO THOMAS D." PICKARD, SAME PLACE.

.eRAK-E-sHosr srncrmcanon forming part of Reissued. Letters Patent No. 11,746, dated June a, less.

'Origiual Ho. 623,584,1lated April 25,1899. Application for relnne filed Icy 1.0, 1899- Serial'll'o- 716,818-

To all whom it 1nay concern:

Belt known that I, RICHARD WALSH, of Chicago, in the county 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 brake-shoes, and has for its object to provide acohstruction whereby a strongand durable brake-shoe Fig. 4 is a transverse sectional view taken on the line 4 4 of Fig. 2, and Fig. '5 is a similar view taken on the line 5 5 of Fig. 2' and illustrating a modified form of my invention.

In carrying out my invention I first provide a plurality of rods 10, preferably of steel.

These rods are preferably round rodsof about one-quarter of an inch in diameter and of a length slightly less than the length of the completed shoe, being bent to conform to the general curvature of said completed shoe. Any suitable number of these rods may be employed, and in the drawings I have shown in Figs. 1 to 4 a construction in which four such rods are used, while in Fig. 5 I have shown a construction in which five are employed. These rods are placed parallel to each other, and a plurality of insets 11, of chilled iron, are cast thereon-in such manner that the rods are embedded to about oneparticularly point' their number may obviously be varied. The

12 of the shoe is cast around the same in such a a way that the said rods are completely .embedded in the cast-metal body of the" shoe a slight distance in front of the rear face thereof.

The front faces of the insets are by this operation brought flush with the front faceof the body of the shoe.

A shoe constructed in accordance with my invention presents various advantageous features.- Theemploym'ut of chilled-metal insets prevents too-rapid wearing of the face of the shoe while in use and at the same time regulates the holding power thereof. As the shoe wears down it grows thinner until its resistance to the strains of use decreases, and in the absence of any provision for maintaining' this strength at a-suitable point the shoe breaks by reason of its thinness. employment, however, of the steel rods embeddedin the body of the shoe the shoe may the used until worn down to such a degree of thinness that the outer portions of said rods are exposed to contact .with the wheel without so weakening the shoe as to cause it to break under the strains of use. ding the rods only partially in the chilledmetal insets I obtain a longer period of wear, for the reason that the wheels wii. not come into contact with the rods as soon as they would-if the rods were entirely embedded in the insets, and thus brought so much closer to the working face of the shoe. By giving to the body of the insets the curved or inclined shapedescribed and shown I prevent the formation of a sharp angle or cutting edge as the insets wear away, so that the tendency to en; or wear the wheel or wheel-tire is (1iminished.

The precise form of construction hereinbefore describedis that which I prefer; but while some of its features are desirable and form subsidiary features of my invention I do not wish to be understood as limiting myself strictly to the details hereinbefore described and shown in the accompanying drawings, as these details may obviously. be modifiedwithout departing from the broader principles of By the- By embed-' 8 I p v 11.746

my invention. For instenoe, while I have described the longitudinally-extending rods as made of steel and prefer this material under most circumstances, it is obvious that other materials having the characteristics of steel required in this particular location and combination of elements may be substituted therefor-as, for instance, wrought-iron or any other tough metal adapted to withstand tensile and transverse strains without fracture, and thereby supply the requisite characteristics to offset the weakness arising from .the

brittleness of the cast-iron when used alone.

I clsim-- 1. A brake-shoe coni rising a cast-ironbody, a lnrality of chil ed-iron inset-s em-' bedded t e'rsin, and e plurality of longitudinally-exteuding rods of steel or the like connecting said insets and embedded'in the castiron bodyof the, shoe, substantially asgdeseribed. I I

2. A brake-shoe comprising a pluraiityof chilled-iron insets, a plurality of longitudinally-extending rods of steel or the like connecting said inset-s and partially embedded therein, and a cast-iron body-inclosing said.

posed trontface of less diameter than its inclosed rear fsce,'and an outwardly and rearwardly curved body-wall connecting the front 1 and rear faces, anda plurality of longitudinally-extending-rods of steel or the like connecting said insets and embedded in the castiron body of' the shoe, substantially. as described.

. RICHARD WALSH.

Witnesses v FREDERICK C. Goonw'm, IRVINE MILLnn.

Images