US1927252A - Brake shoe - Google Patents

Description

Sept. 19, 1933. w. H. WINTERS Filed Nov. 2, 1932 2. Sheets-Sheet 1 INVENTOR. M 1/ M By fl MW ATTORNEY Patented Sept. 19, 1933 UNITED I STATES BRAKE SHOE WilburH. Winters, Larchmont, N. Y., assignor to .The American Brake Shoe and Foundry Company, Wilmington, Del., a corporation of Delaware Application November 2, 1932. Serial No. 640,837 I 4 Claims.

This invention relates to brake shoes of that type which includes a reenforce back embedded in the body of the shoe at the back thereof to hold the parts of the body together in case of fracture.

The object of the invention isto provide a strong and substantial rigid back which can be made in a rolling operation and anchored in the body of the shoe by embedment therein during the casting operation and which will resist the vibration stresses, strains and fatigue to which it is subjected after the body is fractured and hold the parts together until the shoe is worn out.

In the accompanying drawings I have shown selected embodiments of the invention and referring thereto,

Fig. 1 is a plan View of the inner side of a reenforce back with the body indicated in broken lines.

Fig. 2 is a longitudinal sectional View of the shoe.

Figs. 3 and 4 are transverse sectional views on the lines 3-3 and 44 respectively of Fig. 2.

Figs. 5 to 11 are transverse sectional views showing other forms of the back.

Referring to the drawings, the body 12 may be solid cast iron, as shown, or it may have inserts embedded therein in any form of composition shoe and the reenforce is embedded in the body at the back of the shoe when the body is cast thereon.

I have shown the shoe provided with the usual attaching lug which comprises the lug strap 13 having inturned ends 14 engaged with the side margins of the back and the body metal extending up to form projections 15 enclosing the sides of the strap. The reenforce back consists of a strip of ductile metal preferably made in a rolling operation and it is slightly shorter and narrower than the body and is bent arcuately to correspond with the curvature of the body.

Referring to Figs. 1 to 4, the reenforce back 16 has a central longitudinal raised panel 17 and depressed side margins 18 which extend throughout the length of the back, the raised panel being preferably shorter than the side margins of the back to facilitate the flow of body metal for forming the lugs 19 at the ends of the shoe in the casting operation and to provide substantial anchorage for these lugs to the body. Lips 20 are provided on the outer side of the back at the edges of the panel to strengthen the back. The outer side of the panel 17 is exposed at the back of the shoe and the depressed side margins 18 are wholly embedded in the body of the shoe to anchor the body on the back. I prefer to incline outwardly the parts 21 which connect the depressed side margins with the intermediate panel of the back and to arrange the back in the body so that the top of the reenforcing ribs will lie flush with the parts of the body outside thereof.

The back may be provided with a longitudinal chordal rib 22 disposed centrally of the raised panel on the outer side thereof in addition to the ribs 20 at the side edges of the raised panel, Fig. 5; or the side ribs 20 may be omitted and the back provided with a longitudinal chordal rib 23, Fig. 6, centrally disposed on the outer side of the raised panel, in which case this rib would preferably be somewhat larger in cross-section than the rib 22 used with the two side ribs 20, Fig. 5. The back may be embedded in the body with the top of the centrally disposed rib 23 flush with the bodyat the back of the shoe, as shown in Fig. 6.

The ribs at the side edges of the raised panel may be formed by making the back thicker in those parts 24. which connect the side margins with the raised panel, Fig. '7. The raised panel may be provided with a central longitudinal fiat rib 25 on its outer side and a similar rib 26 on its inner side together With the side ribs 27, Fig. 8; or the side ribs 27 may be omitted and a fiat rib 28 somewhat wider than the rib 25 provided on the outer side or" the panel, Fig. 9. In this form of back the body metal may extend over the sides of the panel to the side edges of the rib 28 and lie flush with the outer face of the rib. A wide fiat rib 29'rnay be provided on the outer 35 side of the back and a similar rib 38 on the inner side of the back as shown in Fig. 10, or a fiat 'rib 31, Fig. 11, may be provided of sufificient width to extend from one projection 15 to the other. q

When the body of a brake shoe fractures in actual service, as it frequently does, the parts are held tcgether by the back so that the shoe may continue in use and give efiicient service; but this condition su m'ects the back to excessive stresses strains due to the constant vibration to which the shoe is subjected in service and these vibrations result in the fatigue of metal and the back sometimes breaks before the body of the. shoe is worn out. My invention provides a back of novel construction which is rigid and strong and substantial and which will outlast the body and continue to hold the parts of a fractured body together until the shoe has reached its limit of wear.

I have shown the invention in a common cast iron car shoe and in several embodiments but I reserve the right to embody the invention in any brake shoe to which it is or may be adapted and to make any changes in the form, construction 3- A brake shoe comprising a body, and a reenforce back embedded in the body, said back having a central longitudinal raised panel and an integral strengthening rib on said panel between its side edges.

4. A brake shoe comprising a body, and a reenforce back embedded in the body, said back having a central longitudinal raised panel and integral strengthening ribs on the inner and outer sides of the panel between its side edges.

WILBUR H. WINTERS.

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