Brake Tests

241 458. The types of cast iron steel back brake shoes are shown in Fig. 143 CAST IRON - STEEL BACK TYPE A. AonH PLAIN -% AREA-FULL WIDTH SHOE No’S-498-71/ PLAIN-’/ AREA-FULL LENGTH SHOE No‘S-97-20764-20765 TYPE E SHOE NdS-3-4 SHOE NoS-5-6 7222 BEARING AREA REMOVED FLANGE-AREA EQUAL TO PLAIN SHOE NoS-f-2 Fig. 143. BRAKE SHOES. Forms of shoe tested on machine. Brake Shoe Testing Machine. Description. 459. The Brake Shoe Testing Machine at the Laboratory of the American Brake Shoe and Foundry Company, Mahwah, N. J., is shown in Figs. 144 to 148. The principal parts of the machine are as follows:— A.—A shaft with suitable bearings, bed plates, etc., having a test wheel at one end; a fly wheel of adjustable weight in the center and a 75 h.p., a.c. electric motor at the other end. B. —A test wheel, which for these tests was a 36 in. steel tired wheel of regular pattern. C.—A fly wheel which is so designed that by taking off or adding rings, seven different weights can be obtained.