US1787780A - Brake shoe - Google Patents

Description

Jan 6, 1931. A. w. FREHSE ,78

BRAKE saos Filed Dec. 24, 1928 amnion Patented Jan. 6, 1931'- UNITED STATES PATENT OFFICE ALBERT W. FBEKSE, OF DETROIT, MICHIGAN, ASBIGNOB TO GENEBAI MOTORS CORPO- RATION, OF DETROIT, MICHIGAN, A CORPORATION DELAWARE BRAK E SHOE Application filed December 24, 1928. Serial No. 328,074.

This invention relates to brakes, and particularly to brake shoes as used for frictionally en aging the drums of internal expanding bra res.

An object of the invention is to make a brake shoe possessing in a high degree efli ciency in operation facture. r

Other objects and advantages will be unand economy in manuderstood from the following description.

In the drawing accompanying the description:

Figure 1 is a view in elevation of the novel brake shoe;

Figure 2 is a section on line 2-2 of Fig- ,ure 1;

Figure 3 is a similar section thrdugh a modified form of the shoe.

Figure 4 is another modification in see- I tion.

Referring to the drawing, numeral 5 designates, in general, a brake shoe designed for engagement with the internal surface of the flange of a conventional or any preferred kind of brake drum.

The shoe is apertured at one end as at 7 for association therewith of any suitable anchoring means. At 9 is an opening at the other end of the shoe for carrying a cam follower. It should be explained that these openings 7 and 9 are shown'merely to suggest any sort of means for the anchorage and the cam-engaging instrumentality. Since the 1nvention is not concerned with the anchorage, nor with the cam-engaging means, no fur ther illustration or description need be 'ven.

The shoe comprises a rolled metal llningcarrying member '11. This member will be curved in outline to conform to the inner surface of the drum, as usual. Any sort of lining may be used, and no lining is illustrated. This rolled member may be formed with flanges 13. These flanges are to be of slight radial de th, forming a rolled channel. To each of t ese flanges is secured a stiffening member 15 of sheet metal. These stiffening members are to be welded to the flanges 13 as shown.

In Figure 3 is a modified form. In this form the lining-carrying part 19 is also a Brake shoes are required in very large I numbers, especially in view of the almost uni; versal use of internal rigid shoe brakes. The very great production of motor vehicles and the almost universal use of four-wheel brakes makes necessary the utmost economy in manufacture consistent with efliciency in operation.

Shoes of channel section and of T-section are known'to be old. Shoes of sheet metal having their parts secured by welding are also old. This invention aims to show a way to make .the shoes of T-section or of channel section more economically than heretofore, and with greater strength. When shoes are rolled into -T-section or channel section, and the flanges are of suificient dimension to give the necessary strength, the provision of the curved surface for the lining-carrying part causes distortion of the metal in the flanges.

In shoes made from sheet metal stampin s with the parts welded together much diiflculty has arisen in properly securing the parts. These difficulties are well known to those familiar with the art and with the patents which show attempts to avoid the difiiculties.

These difliculties are overcome by the construction here shown. The stamped metal stiffening members are welded to the radially short flanges of the lining-carrying part. The transverse dimension of the radial flan e of the lining-carrying part is substantia y are of stamped metal and the lining-carry; orm o ing part which is rolled either in the Such a shoe is very chea to.

- stantaneous, thereby savin flange 1n edge-to-e a T-section, or channel is almost as cheap as a flat metal sheet. The attachment is intime in the operation of manufacture. l overlapping of metal is avoided, thereby savin material and facilitating'the operation 0 welding.

As a further modification, Figure 4 showsa shoe having a linin carrying part 25 with a flange 27 of limite radial extent but wider than the flange of Fi are 3. To this flange are welded two sti ening members 29 as shown.

I claim:

1. A brake shoe comprising a rolled liningcarrying part with at least one short radial flange, and a stifl'ening member secured to said flange in the plane of the flange.

2. A brake shoe having a curved'liningcarrying part consisting of a rolled member having ashort radial flange, a stamped sheet metal stiflenin member in edge-to-edge contact with said ange, and secured thereto.

3. A brake shoe having a rolled liningcarrying part with at least one short radial flange, and a stiffening member welded to said flange in the plane ofthe flange.

4. A brake shoe having a curved liningcarrying partconsisting of a rolled member having a short radial flange, at least one stamped sheet metal stifl'ening member in ed e-to-edge contact with said flange and elded thereto.

5. A brake shoe havin a lining-carrying part with a pair of ra 1&lly Sh0lt flanges, stifl'ening members shaped to en age said flanges in edge-to-edge relation, said stifiening members being secured to said flanges.

6. A brake shoe havin a lining-carrying part with a pair of radlally short flanges, stiffening members shaped to engage said flanges in edge-to-edge relation and welded thereto.

7. A method of making brake shoes consisting in rolling a lining-carryin part with at least one short dimension ra ial flange, shaping a stiffenin member to en age said e relation, an welding said stiifenin mem er to said flange.

8. The met 0d of making brakev shoes con-- sisting in rolling a lining-carrying art into curved outline and with a radial ange of short depth, stamping from sheet metal a stiffening member shaped to engage said flan e in edge-to-edge relation, and flash wel ing said stiffening member to said flange.

In testimony whereof I aflix my si ature.

ALBERT W. FRE SE.

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