Drum brake shoe hold-down and retraction spring and anchor post

Details Drum brake shoe hold-down and retraction spring and anchor post Drum brake shoe hold-down and retraction spring and anchor post

1989-09-25

1991-03-12

Reger, Duane A.

Brakes

Wheel

Transversely movable

188216, 188340, F16D 6509, F16D 7100

Patent

active

049986023

ABSTRACT:
A single generally U-shaped wire spring has a plurality of torsional spring loops formed in the center and fitting over an anchor mounting post for a leading-trailing shoe assembly. Each arm of the spring extends along the web of a shoe and terminates in a hook end which fits within a slot in the associated shoe web. The spring will return the brake shoes to their retracted position after service or parking brake operation, reengaging the adjuster/strut assembly after actuation of the wheel cylinder during service brake operation; retain the lower ends of the shoes against the anchor plate; and hold the shoes against the backing plate by the cantilever spring force component of the spring acting against retaining lips formed as part of the anchor mounting post, resulting in a cantilever spring load directed onto the web of each shoe toward the backing plate.

REFERENCES:
patent: 4088311 (1978-05-01), Rupprecht
patent: 4762209 (1988-08-01), Copp

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