Automatic adjusters for drum brakes

Details Automatic adjusters for drum brakes Automatic adjusters for drum brakes

1980-05-19

1983-06-28

Halvosa, George E. A.

Brakes

Wheel

Transversely movable

192111A, F16D 6540

Patent

active

043900860

ABSTRACT:
A vehicle drum brake comprises an automatic adjuster with thermal compensation, so that the brake does not become over-adjusted following thermal expansion and subsequent contraction of the drum. The adjuster overcomes the problems associated with adjusters which at high temperatures are disabled, and so might leave the brake under-adjusted. The adjuster comprises a bimetallic strip or equivalent incorporated into the adjuster strut to expand the strut when the drum expands, and to contract the strut when the drum contracts. Thus the adjuster takes up excess slack due to lining wear, but not that due to drum expansion. The adjuster is suited for use on those drum brake adjusters where the strut is lengthened by operation of the service brake actuator, and not of the handbrake actuator.

REFERENCES:
patent: 2292017 (1942-08-01), Smith
patent: 2818143 (1957-12-01), Phillips
patent: 3384204 (1968-05-01), Swift
patent: 3429412 (1969-02-01), Wobrock
patent: 4243124 (1981-01-01), Kluger
patent: 4270632 (1981-06-01), Langert

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