Importance

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Abstract

A duo-servo drum brake (10) includes an application adjuster mechanism (50). The application adjuster mechanism (50) comprises a threaded member (51) anchored to one brake shoe end (34), a socket member (61) anchored to the other brake shoe end (32), an opening (63) in the socket member (61) which freely receives a threaded shaft (53) of the threaded member (51), a starwheel (70) rotatedly mounted on the threaded member (51) and abutting an adjacent end (65) of the socket member (61), the socket member (61) having an axially extending button (64) and a torsion spring (90) disposed about its outer surface, the torsion spring having a hook end (95)engaging the button (64). A cable mechanism (60) has one end connected to the anchor pin (40) of the duo-servo drum brake (10) and the other end has a spring member (44) connected with a lever (80) of the adjuster mechanism (50). The lever (80) has a figure-eight shaped opening (81) receiving the button (64) so that the lever (80) is rotatably mounted thereto, with an end part (87) engaging the starwheel (70) and an opposite end having an opening (84) receiving the spring member (44). The lever (80) includes another opening (85) which receives an end (94) of the torsion spring (90).

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First Claim