Drum brake adjuster

Details Drum brake adjuster Drum brake adjuster

1979-02-02

1980-09-16

Halvosa, George E. A.

Brakes

Wheel

Transversely movable

188 795P, 188196BA, 192111A, F16D 6556

Patent

active

042224675

ABSTRACT:
The present invention relates to an improved drum brake assembly having an automatic adjuster to compensate for lining wear to a pair of brake shoes. A backing plate includes an anchor to pivotally support the pair of brake shoes and to secure a hydraulic actuator thereto. An extendible member cooperates with the pair of brake shoes to define a non-braking position and the hydraulic actuator is operable to move the pair of brake shoes to a braking position in engagement with a rotatable member. A pawl is pivotally engageable with the extendible member and the hydraulic actuator via a spring extending from one of the pair of brake shoes to the pawl so as to pivot when the hydraulic actuator is operable. The pivoting of the pawl causes the pawl to extend the extendible member if the movement of the pair of brake shoes is above a predetermined value. The pawl includes an arm which is pivotally engageable with a piston of the hydraulic actuator. The arm also defines an arcuate abutment between the other brake shoe and the hydraulic actuator. In addition a parking lever may also be pivotally engageable with the hydraulic actuator and define another arcuate abutment opposing the one brake shoe.

REFERENCES:
patent: 2378662 (1945-06-01), Shuman
patent: 2389618 (1945-11-01), Goepfrich
patent: 3706360 (1972-12-01), Nyunoya
patent: 4101011 (1978-07-01), Burnett

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