Drum brake having pawl and lever

Details Drum brake having pawl and lever Drum brake having pawl and lever

1978-09-28

1980-09-23

Butler, Douglas C.

Brakes

Wheel

Transversely movable

188 795GT, 188196BA, 188327, F16D 6538

Patent

active

042237653

ABSTRACT:
A drum brake includes a backing plate with an anchor for pivotally engaging one end of a pair of brake shoes. A hydraulic actuator is engageable with the other end of the pair of brake shoes and is operable to move the pair of brake shoes from a rest position to a braking position. An extendible strut extends between the pair of brake shoes to limit the retraction of the pair of brake shoes upon termination of a braking application. A lever is pivitally coupled to one of the brake shoes and a pawl is pivotally coupled to the other brake shoe. The pawl and lever are releasably interlocked with their respective brake shoes via hooks which are received in slanted slots or openings. A resilient member cooperates with the pawl to retain the latter in engagement with the extendible member and also cooperates with the pair of brake shoes to urge the same into engagement with the hydraulic actuator. The extendible member engages the pair of brake shoes at an intermediate portion and the pivotal coupling between thelever and one brake shoe and the pawl and other brake shoe is disposed at a location between the intermediate portion and the other end of each brake shoe.

REFERENCES:
patent: 2822893 (1958-02-01), Flueler
patent: 3460653 (1969-08-01), Wieger
patent: 3717227 (1973-02-01), Rath
patent: 3963100 (1976-06-01), Kaub
patent: 4101011 (1978-07-01), Burnett

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