Brakes – Operators – Multiple
Patent
1975-10-30
1977-04-05
Reger, Duane A.
Brakes
Operators
Multiple
188217, 188331, F16D 5122
Patent
active
040156940
ABSTRACT:
A vehicle brake having a pair of brake shoes moveably mounted and arranged in end-to-end relationship on a fixed backing plate. A pair of levers is pivotally mounted on the backing plate. The levers have thrust transmitting portions which are interposed between a pair of opposed brake shoe ends and a hydraulic service brake actuator for moving the brake shoes into engagement with the brake drum. The levers also have swinging end portions which pivot inwardly in opposite directions upon outward movement of the thrust transmitting portions. The lever thrust portions have concavely curved camming surfaces which slidably engage complementary convexly curved brake shoe end surface for transmitting the hydraulic actuator force to the brake shoes. A mechanically actuated parking brake mechanism is mounted on the backing plate and is operatively connected to the lever swing end portions by a pair of links. One end of each link is operatively connected by a pin within a slotted end of an actuating handle, with the other link ends being slotted and moveably connected to the lever swinging end portions. Actuation of the handle by a parking brake actuating force pivots the lever swinging end portions inwardly through the connecting links which in turn expand the brake shoes outwardly into engagement with the drum through the resulting outward movement of the lever thrust portions.
REFERENCES:
patent: 1984883 (1934-12-01), La Brie
patent: 2176398 (1939-10-01), Fowler
patent: 2196333 (1940-04-01), Bowen
patent: 3023852 (1962-03-01), Powlas
Danko John D.
St. John Richard C.
Aspro, Inc.
Reger Duane A.
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