US1872850A - Brake shoe - Google Patents

Description

' Aug. 23, 1932.

M. N'. TRAINER BRAKE SHOE Filed May 31. 1930 Patented Aug. 23, 1932- UNITED STATES PATENT. OFFICE MAURICE N. TRAINER, OF EAST ORANGE, NEW JERSEY, ASSIGNOR TO THE AMERICAN BRAKE SHOE AND FOUNDRY COMPANY, OF WILMINGTON, DELAWARE, A CORPORA- TION OF DELAWARE BRAKE SHOE Application filed May 31, 1930. Serial No. 457,793.

This invention relates to brake shoes and more particularly to that type of shoe inof a cast iron body.

It is desirable to provide inserts which will extend in the shoe as close as possible to the outer side of the wheel tread, and at the same time to avoid unnecessarily widening the body of the shoe. It is the practice to arrange the inserts in the mold cavity and-then ,to pour the molten cast iron into the mold cavity thereby embedding the inserts in the body of the shoe and exposed at the Wearing face of the shoe. The inserts tend to chill the cast iron body'andif the comparatively small area of cast iron adjacent the inserts at the inner side of the shoe is chilled it is liable to fracture in service and break away and permit the inserts to work loose and drop out of the body. If sufficient cast iron' is provided at the outer side of the shoe to counteract the liability of the body to fracture at this point because of the chilling effect of the inserts it is necessary to materially increase the width of the shoe which correspondingly increases the weight and the cost.

This inventioii has for its object to enable the inserts to be arranged in the body of the shoe to extend to or close to the outer side of the wheel tread and ,to reenforce and strengthen the cast iron body at the outer side thereof to resist the tendency of the body to fracture at this side and to hold the parts of the body and the inserts in place in case of fracture.

I have illustrated the invention in the accompanying drawing in a center-fastening driver shoe to which the invention isespecially adapted and referring thereto.

Fig. 1 is a plan view of the shoe.

Fig. 2 is a side elevation at the outside of i the shoe.

perspective view .of the lug strap.

The shoe illustrated is of the flanged type and itcomprises a'cast iron body 5, a. reenforce bac 6 and a lug strap 7, these parts being in all general respects common in this type of shoe. Inserts 8 are embedded in that part of the body which engages the tread of the wheel and inserts 9 are embedded in that part of the body which engages the flange of the wheel. I haveindicated the outline of the wheel tread and flange by the broken line 10 in Fig. 3. The inserts 8 are embedded in the body of the shoe so that they will extend to or close to the outer side of. the wheel and have Wearing con-I tact with substantially the full width of the tread of the wheels. This is accomplished by extending the width of the shoe on the outer side (the right side in Fig. 3) and from end to end thereof so that there will be sutficient body metal at the outer side of the shoe 1 to enclose the outer ends of the inserts 8. This side extension of the shoe is not sulficient to materially increase the weight of the shoe and yet it is suflicient to protect the outer ends of the inserts. In the service of the shoe this extension of the body will be mostly beyond the outer side of the wheel and will not be worn down by the wheel with the other parts of the shoe when the shoe is properly mounted with respect to the wheel. As the shoe wears a flange will be formed by this extension of the body at the outer side of the. shoe and because this extension is of limited area, and because it encloses the outer ends of the inserts and is liable to be chilled thereby in the casting operation, and because it does not wear down with the shoe in service but forms a flange at the outer side of the shoe, it is essential thatmeans be provided for reenforcing and strengthening this extension to preventit from cracking and falling away from the shoe. This is accomplished by means of the back which is extended over the outer side extension on the body and is provided with a flange which extendsdown on the outer face of the outer extension of the body and is embedded therein and anchored .thereto. This flange not only serves to reenforce the outer s1de extension ofthe body butin case of fracture of this extension it will retain'the parts on the shoe, and it also serves to retain other cracked parts of the body and the inserts'in position sothat the 1 body metal shoe may contine in service without material reduction in efliciency or mileage Wear so long as the parts are held together. The back 6 is made in the form of a plate stamped to the proper shape and having the usual curved flange part and its outer side which is embedded in the body at the outer side thereof. The back is provided with openings 12 formed partly in the flange 11 and partly in the body of the back to receive the body metal at 1 3 which assists in anchoring the body to the back. In accordance with present construction the back is provided with other openings 14 to receive for the same purpose. The shoe is registered in position in contact with the wheel by the flange of the wheel engaging the flange of the shoe and the flange 11 of the back will always be located outside of the outer side of the wheel so that it can never contact with and cut the tread of the,

wheel. This invention enables inserts to be extended in the shoe so that they will contact with the tread of the wheel to the outer side of the wheel with the shoe body reenforced and strengthened at the outer ends of the inserts to resist the tendency of this part of the shoe body to fracture and to hold the parts together and the inserts in the body in case the body fractures. The width of the shoe is slightly increased at the outer side thereof to permit the inserts to be positioned as before described and the flange 11 of the back will reenforce and strengthen the body sufliciently to permit this positioning of the inserts. The outer side of the body ma be reduced at 15 from or about the edge 0 the flange 11 to the wearing face. The body of the shoe may fracture at its outer side but the flange and the anchoring buttons 13 of the cast .iron in the openings 12 will hold the parts together and retain the inserts in the body so thatv the shoe may be continued'in use and give eflicient service. The treadle of the shoe is made wider than the tread of the wheel so that the outer side of the shoe will project beyond the outer side of the wheel.

The flange 11 cooperates with the curved flange for holdingthe vparts of the shoe together afterfracture and the shoe without materially increasing the location of the flange beweight. The yond the line of wear enables the shoe to be continued in service without danger of the flange contacting and cutting the tread ,of the wheel and until the body of 'theshoe is substantially worn completely away. y invention increases the factor of safety and the efliciency of the shoe by holding the parts together when the body a down-turned flange 11 at liability of the back scoring,

because the flange is located outside of the area of wear on the fractures so that they Will continue in use, and it prolongs the life of the shoe and produces greater mileage wear, without materially increasing theweight of the shoe or changing established shapes, by enabling the shoe to continue in service until the body is almost worn completely away and without wise damaging the wheel.

I do not limit the invention to the particular embodiment shown in the drawing but reserve the right to use the invention in other types of shoes and in other forms and'constructions within the scope of the following claims.

I claim:

1. The combination with a wheel having a flange and a tread, of a brake shoe having a flange and a tread to engage the wheel and comprising a body, a reenforce embedded in the body at the back thereof, the body being extended laterally beyond the outer side of the wheel, and a depending flange on the reenforce embedded in the extension of the body and outside of the area of wear of the tread of the wheel on the body to avoid contact with the wheel as the body wears in service.

a 2. The combination with a wheel having a flange and a tread, of a brake shoe having a flange and a tread to engage the wheel and comprising a body, a. reenforce embedded in the body at the back thereof, the body being extended laterally beyond the outer side of the wheel, a depending flange on the reenforce embedded in the extension of the body and outside of the area of wear of the tread of the theinserts will contact with the tread of the wheel to its outer edge.

MAURICE N. TRAINER.

cutting or other-

Images