Brakes – Operators – Multiple
Patent
1981-04-13
1982-12-21
Reger, Duane A.
Brakes
Operators
Multiple
188326, F16D 5148, F16D 6522
Patent
active
043644562
ABSTRACT:
A drum brake assembly includes a pair of brake shoes which are carried by a backing plate and engageable with a hydraulic actuator. The hydraulic actuator is operable to move the pair of brake shoes from a rest position to a braking position. A strut extending between the pair of brake shoes cooperates with a parking arm to move the pair of brake shoes to the braking position during a parking brake application. A support assembly on the backing plate is disposed opposite the hydraulic actuator for the purpose of absorbing braking torque developed by the pair of brake shoes. The support assembly comprises a pair of slots and a lever. The lever is movable in response to movement of the parking arm to adjust the position of the pair of blocks relative to each other. In a first position the blocks are in abutment with the backing plate while in a second position the blocks are free to move a limited amount relative to the backing plate. Moreover, the lever imparts a separating force to the pair of brake shoes via the blocks during a parking brake application to expand the brake shoes radially. This expansion is in addition to the movement imparted to the brake shoes by the strut and parking arm.
REFERENCES:
patent: 2181029 (1939-11-01), Thomas
patent: 2842229 (1958-07-01), Ross
patent: 3400787 (1968-09-01), Keller et al.
patent: 3708044 (1973-01-01), Torri et al.
Decker Ken C.
Reger Duane A.
Schoenle Paul David
The Bendix Corporation
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