Tennant Homework 1: Clutch And Brake Assembly and Production Method

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Patent 4 799 579: Clutch Brake Assembly (1989)


This patent is for a new assembly for heavy duty machinery. It consists of a metal shoe with an exterior backing surface. It is made of several laminae of overlapping metallic fibers arranged in an overlapping fashion which prevents the fibers from lying flat on the backing surface. This patent seeks to rectify the shortcomings of caliper disc brakes, which are prone to overheating. This breaks down the bond between the shoe and the backing surface; previous techniques to alleviate this problem included riveting the liner to the backing surface. However, this reduced the wear volume and overall surface area of the brake shoe. Another method was to create large holes in the brake shoe and fill them with a lamina of friction material which was molded onto the shoe. This resulted in high shearing forces which led to failure of the moldings when subjected to high temperatures. The lamina was also irregular, which led to difficulties in manufacturing. This patent aims to provide a shoe which remains intact at high temperatures and pressures; eliminates the needs for organic bonds, rivets, and openings; and performs with higher overall strength.