Drum brake device having leading/trailing mode and duo servo mod

Details Drum brake device having leading/trailing mode and duo servo mod Drum brake device having leading/trailing mode and duo servo mod

1999-04-29

2000-09-19

Oberleitner, Robert J.

Brakes

Wheel

Transversely movable

188362, F16D 5100

Patent

active

061198331

ABSTRACT:
Disclosed is a drum brake device in which during a service brake application, a pair of brake shoes operates in a leading/trailing mode, and during a parking brake application, a parking brake mechanism operates to cause the brake shoes to operate in the duo servo mode. A first lever, an equalizer and a second lever, which make up the parking brake mechanism, are all assembled onto one of the brake shoes. The second lever includes an input portion, a lever contact portion and an equalizer contact portion. The input portion receives a force from a parking lever. The lever contact portion applies a turning force to the first lever. The equalizer contact portion applies a turning force to the equalizer. The second lever, when it is turned, turns the first lever and then the equalizer.

REFERENCES:
patent: 4387792 (1983-06-01), Imamura
patent: 4768631 (1988-09-01), Heibel
patent: 5062504 (1991-11-01), Yamamoto

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