Combined parking brake lever and adjuster in a drum brake

Details Combined parking brake lever and adjuster in a drum brake Combined parking brake lever and adjuster in a drum brake

1989-04-03

1991-08-27

Graham, Matthew C.

Brakes

Wheel

Transversely movable

188 7954, 188329, 188331, F16D 6554

Patent

active

050426230

ABSTRACT:
A duo servo drum brake assembly having a parking brake actuating lever combined with an automatic brake adjuster strut, the combined lever and strut engaging adjacent ends of the brake shoes of the assembly for brake adjustment and parking brake actuation of the drum brake assembly. The parking brake actuating lever is pivotally and slidably mounted on the strut for planar pivotal and limited planar translational movements as the lever is subjected to parking brake apply and release forces. The lever has a cam end acting on the end of one brake shoe and on the strut to expand the combined lever and strut mechanism for parking brake actuation. The lever is shorter in overall length than the strut and is no longer than about 1/2 of the radius of the friction braking surface of the brake drum of the brake assembly, yet has effective force multiplication ratios for parking brake apply. The arrangement eliminates the spreader bar typically used in such priior art brake assemblies.

REFERENCES:
patent: 2758680 (1952-01-01), Rabe
patent: 2842229 (1958-07-01), Ross
patent: 3064767 (1959-11-01), Wieger
patent: 3420340 (1969-01-01), Hopf
patent: 3517779 (1970-06-01), Bolenbaugh
patent: 3623578 (1971-11-01), Plume
patent: 4139083 (1979-02-01), Hoshino et al.
patent: 4344512 (1982-08-01), Woo
patent: 4595082 (1986-06-01), Le Deit

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