US925837A - Brake-shoe. - Google Patents

Description

O. D. PBTTIS. BRAKE SHOE. APPLICATION FILED 001. 31, 1908.

925,837; Paterited June 22,

SHEEN- G. D. PETTIS.

BRAKE SHOE. APPLICATION FILED 001 .31,- mos. 925,837. Patented June 22, 1909.

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UNITED sTATEsPArn FFTCE.

. CLIFTON D. PETTIS, OF CHICAGO, ILLINOIS, ASSIGNOR TO NATIONAL BRAKE SHOE COMPANY,

OF CHICAGO, ILLINOIS, A CORPORATION.

BRAKE-SHOE.

Specification of Letters Patent.

Patented June 22, 1909.

Application filed October 31, 1908. Serial No. 460,389.

.To all whom it may concern:

Be it known that I, CLIFTON D. Pnrrrs, a citizen of the United States, residing at Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Brake-Shoes, of which I do declare the following to be a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification.

The present invention has relation more particularly to that class of brake shoes in which the bodies of the shoes are formed of cast metal, and in which reinforcing bars of ductile metal are embedded in the cast metal bodies in order to give greater strength thereto.

The object of the present invention is to provide an exceedingly strong, effective and durable shoe and to this end the invention consists in the features of improvement hereinafter described, illustrated in the accompanying drawings and particularly pointed out in the claims at the end of this specification.

Figure 1 is a view in longitudinal vertical section through abrake shoe embodying my invention, the brake head being shown in side elevation. Fig. 2 is a plan view of a sheet metal blank from which the reinforcing bars of the shoe will be formed. Fig. 3 is a plan view showing the reinforcing bars after the webs connecting them have been shaped to form the retaining lugs of the shoe, this view showing also in dotted lines the finished shoe. Fig. 4 is a view in cross section on line 44 of Fig. 1. Fig. 5 is a view in cross section on line5-5 of Fig. 1. Fig. 6 is a view similar to Fig. 2, but showing a somewhat modified form of blank. Fig. 7 is a view similar to Fig. 3, but showing the blank illustrated in Fig. 6 as folded into shape. Fig. 8 is a detail plan view showing a portion of the back of the shoe with the reinforcing strips or bars bent to pass over the central lug. Fig. 9 is a view in vertical section on line 9-9 of Fig. 8, or line 99 of Fig. 10. Fig. 10 is a plan view of the central portions of the reinforcing strips'or plates connected together and arranged to ass over the central retaining lug of the s oe body.

Referring to the form of invention illustrated in Figs. 1 to 5 of the drawings, A designates the body of the brake shoe that is formed of cast metal, preferably cast iron. As shown, the body A is provided at its center with a transverse rib a adapted to enter a notch formed in the brake head B. EX- tending lengthwise of the back of the shoe and connected with the shoe body in the operation of casting the same, are the reinforcing bars or strips C of ductile metal such as sheet steel or the like, these strips being joined together at their ends by the integral webs C. To form the strips or bars C and their connecting webs, a blank is first cut to the shape shown in Fig. 2. The web portions C of this blank are then bent to form inverted U-shapcd lugs, as clearly seen in Figs. 3 and 4 of the drawings. l/Vhen the blank has been thus bent to the required shape it will be set'in the mold and the cast metal, of which the body of the shoe is to be formed, will then be poured into the mold and in the casting operation the strips or bars C will be securely embedded in the cast metal which will flow around the edges of the bars and between them. As shown, the webs C are formed with holes 0 which, when the webs are bent to the required shape, will come coincident and will serve to receive the retaining bolts D that unite the lugs formed by the webs in the yoke-shaped ends of the brake head B. Preferably, the outer edges of the webs C are notched out or cut away as shown at c, the purpose of this being to permit the cast metal of the shoe body to flow more completely over the end portion 0 of the strips or bars C. By reference to Fig. 3 of the drawings it will be seen that the cast metal shoe body has formed integral therewith at its ends and rising from its back, the transverse lugs a, the metal of which these lugs are formed extending through the notches c and over the ends 0 of the bars or strips C. The cast metal may extend to any desired height between the walls of the retaining lugs which are formed by bending the webs C.

By reference to Figs. 1 and 4 it will be seen that the bearing of the ends of the brake head B is exerted principally upon those portions of the ends of the shoe at the sides of the retaining lugs, and by forming the retaining lugs integral with the side bars or strips C, not only do these lugs afl'ord a most effective means for attaching the shoe to the brake head, but they also materially strengthen and give rigidity to the strips or bars 0 at the points subjected to the greatest strain- By forming the retaining lugs at the ends of the shoe in the manner shown, and of a tough or ductile metal, the end lugs of the shoe body may be comparatively light and, consequently, the portion of the shoe body that will be discarded when the shoe is worn out will be correspondingly lessened. This not only reduces the weight of the shoe, but also correspondingly reduces the waste. By cutting away the webs C, as indicated at c, or by extending the ends .0 of the reinforced bars or strips C beyond the webs that form the retaining lugs, a more secure embedding of the bars or strips C in the cast metal of the shoe is effected, and the metal of the lugs a is more securely united to the body of the shoe. So also, by providing an open space between the bars or strips 0 at their longitudinal centers, the cast metal of which the shoe body is formed can flow freely between and around said bars or strips in order to form the central lu a.

lnstead of forming the blank of the shape shown in Fig. 2, this blank may be cut to the shape shown in Fig. 6, in which the longitudinal reinforced bars 0 are connected together not only by the webs C at their ends but also by the central web C that is preferably formed with a hole therethrough. When the blank shown in Fig. 6 has its webs C bent to form the end retaining lugs, as illustrated in Fig. 7, the bars or strips 0 will be drawn toward each other, and when the blank thus shaped is placed within the mold and the cast metal of which the shoe body is to be formed is poured into the mold, the cast metal will flow about and embed the bars or strips 0 as in the construction shown in Figs. 1, 4 and 5 of the drawings, and the cast metal will also flow through the hole 0 so that the center lug a of the shoe will be united with the body of the shpe, not merely at its ends, but also centrally.

Instead of having the bars or strips C pass through the center lug a of the shoe, these bars or strips may be bent transversely, as at a, so as to extend over the lug a and in such case the cast metal will flow around the edges of the bent portions 0 and extend to the outer face of such bent portions.

In Fig. 10 of the drawings the reinforced bars 0 are shown as connected by an imperforate web .0 that is bent upwardly as at 0, so as to ass over the central lug a of the shoe body. y passing the reinforced bars or strips over the central lug, such bars will be directly exposed to the brake head B and will effectively serve to resist the strain on the shoe at such point.

It will be understood, of course, that the metal plate of which the reinforced bars and the retaining lugs are formed will be of sufficient thickness (say about three-sixteenths of an inch) to give the required strength to the lugs which constitute the means for attaching the shoe to the brake-head; and, as these lugs are strong and tough, the necessity is avoided of employing cast metal attaching lugs which would need to be much heavier and which would correspondingly increase the cost of the shoe. Moreover, when the shoes have been worn to the limit of safety, there would be much less waste than with shoes having end retaining lugs of cast metal for attachment to the brake-head.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. A brake-shoe having a cast metal body and a ductile metal reinforce comprising longitudinally extending bars, the end portions of which are united by raised attaching lugs integral with said bars and rojecting beyond the cast metal body of t 1e shoe.

2. A brake-shoe having a cast metal body and a ductile metal reinforce comprising longitudinally extending bars, the end portions of which are united by raised transversely perforated, attaching lugs of inverted U-shape formed integral with the inner edges of said bars and projecting beyond the cast metal body of the shoe.

3. A brake-shoe having a cast metal body and a ductile metal reinforce comprising longitudinally extending bars, the end portions of which are united by transversely perforated raised lugs formed integral with said bars.

4. A brake-shoe having a cast metal body and a ductile metal reinforce comprising longitudinally extending bars united adjacent their ends by raised metal lugs formed integral with said bars, the extreme end portions of said bars extending beyond the raised lugs and beneath the cast metal lugs at the ends of the shoe.

5. A brake-shoe having a cast metal body and a ductile metal reinforce comprising longitudinally extending bars embedded in the cast metal body at its back and inverted U-shaped lugs perforated transversely and extending between said longitudinal bars.

6. A brake shoe having a cast metal body with transverse end lugs on its rear face and a reinforcin back for said shoe comprising longitudinally extending bars, the end portions of which are united by raised attaching lugs integral with said bars and rojecting beyond the cast metal body of said shoe, the ends of said bars extending beyond said attaching lugs into said cast metal end lugs.

7. A brake shoe having a cast metal body with transverse, cast metal end lugs on its rear face, and a reinforcing back comprising said bars extending beyond the under-cut, longitudinally extending bars united at their outer edges of said attaching lugs into said ends by raised, transversely perforated, atcast metal end lugs.

teching lugs that project beyond the cast CLIFTON D. PETTIS. 5 metal body of the shoe, said attaching lugs Witnesses:

bemg arranged adjacent said cast metal end ELEANOR HAGEWOOD,

lugs and having under-cut, outer edges and KATHARINE GERLAOH.

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