Patent ID: 6899205
Filing Date: 2005-05-31
Classification: B24B,F16D

Abstract:
1. A drum brake assembly including a rotatable drum having a radially inner braking surface and a resiliently expandable brake shoe of single piece construction and of generally circular form mounted within said drum against a backing plate, said brake shoe having a radially outer face and friction lining mounted thereon in facing relationship to said radially inner braking surface, an actuator having actuated brake on and released brake off conditions and being operable in said actuated condition to diametrically expand said brake shoe, and positioning units for positioning said brake shoe within said drum when said actuator is in said brake off condition and said brake shoe has resiliently contracted, to provide for complete clearance between the outer face of said friction lining and said inner braking surface, said positioning units including at least a pair of spaced apart abutments arranged to abut an internal face or edge of said brake shoe in said brake off condition and which are connected to extend outwardly from said backing plate, a biasing spring extended in connection between said brake shoe and said backing plate and being provided to bias and return said brake shoe from a position in which said internal edge or face of said brake shoe is spaced from said abutments into abutting engagement with said abutments upon release of said actuator from said brake on to said brake off condition.