Drum brake assembly and shoe hold-down and retraction spring the

Details Drum brake assembly and shoe hold-down and retraction spring the Drum brake assembly and shoe hold-down and retraction spring the

1987-05-29

1988-08-09

Halvosa, George E. A.

Brakes

Wheel

Transversely movable

188216, 188340, 192101, F16D 5126

Patent

active

047622091

ABSTRACT:
A single generally U-shaped wire spring has a partial loop formed in the center and fitting over an anchor 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 slots are so located in the web to obtain the desired distribution of spring loads on the adjuster/strut assembly and on the anchor plate. The spring will return the brake shoes to the adjuster/strut assembly after actuation of the wheel cylinder during service brake function; retain the lower ends of the shoes against the anchor plate; and hold the shoes against the backing plate by the force component of the spring wire acting against the bottom side of the cable support and against the top of the outer ramp of the anchor plate, resulting in a spring load directed onto the web of each shoe.

REFERENCES:
patent: 2509643 (1950-05-01), Hoisse
patent: 3554332 (1971-01-01), Harrison
patent: 4130189 (1978-12-01), Katagiri et al.
patent: 4216850 (1980-08-01), Kizaki

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