Clip-on automatic adjuster strut lever for a drum brake

Details Clip-on automatic adjuster strut lever for a drum brake Clip-on automatic adjuster strut lever for a drum brake

1990-10-09

1991-11-26

Oberleitner, Robert J.

Brakes

Wheel

Transversely movable

188196BA, F16D 5100, F16D 6538

Patent

active

050675966

ABSTRACT:
An automatically adjustable strut (60) is mounted adjacent a drum brake (10) wheel cylinder (20) and strut forks (62, 66) bear against a pair of brake shoes (12, 14) and a parking brake lever (50). The strut (60) extends automatically according to wear of the brake shoes (12, 14) and comprises a nut-and-bolt system operated by a pawl (75) engaging teeth (84) of a nut (80). The pawl (75) is part of a clip-on automatic adjuster strut lever (100) mounted resiliently upon a body (68) of the strut (60). The strut lever (100) includes a loading arm (108) which resiliently engages the body (68) of the strut (60), so that proper operational loading is effected by the pawl (75) upon the nut (80). The strut lever (100) also includes a spring lever arm (120) which engages a rocker lever (90) that moves the lever arm (120) and pawl ( 75) when the brake (10) is released toward an at-rest position, and then permits movement of the pawl (75) in an opposite direction when the brake (10) is applied. The strut lever (100) is mounted slidably onto the body (68) of the strut (60) by way of a base member (104) having an opening (106) whose circumference has a portion (113) received within a groove (65) in the body (68) of the strut (60).

REFERENCES:
patent: 3605957 (1971-09-01), Mossey
patent: 4148380 (1979-04-01), Haraikawa
patent: 4375252 (1983-03-01), Aono et al.
patent: 4503949 (1985-03-01), Carre et al.
patent: 4646881 (1987-03-01), Denree et al.
patent: 4729457 (1988-03-01), Cousin et al.

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