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

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

1989-09-25

1991-02-19

Butler, Douglas C.

Brakes

Wheel

Transversely movable

188216, 188340, 188341, F16D 5126

Patent

active

049935259

ABSTRACT:
Each of a pair of wire springs has a loop end fitting on an anchor mount for a leading-trailing shoe assembly. Each spring has an arm extending from its loop end along the web of a shoe and terminates in a hook end which fits within a slot in the associated shoe web. The springs will return the brake shoes to their retracted position after serice or parking brake operation by cantilever spring bias force stored in the spring arms as the springs are installed, 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 down against the backing plate by torsional spring bias forces of the springs which are stored in the spring loop ends and are directed onto the web of each shoe toward the backing plate through the spring arms and the arm outer portions which are immediately adjacent to the spring arm hook ends. The anchor mount is constructed to receive the loop ends in their torsional spring biased conditions and retain them in that condition, and also to hold the spring loop ends as the cantilever spring bias forces are stored in the spring arms.

REFERENCES:
patent: 2642159 (1953-06-01), House
patent: 3095950 (1963-07-01), Scheel
patent: 3203512 (1965-08-01), Lepelletier
patent: 4130189 (1978-12-01), Katagiri et al.
patent: 4494633 (1985-01-01), Idesawa
patent: 4762209 (1988-08-01), Copp

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