Drum brake assembly having parking brake actuator adjuster with

Details Drum brake assembly having parking brake actuator adjuster with Drum brake assembly having parking brake actuator adjuster with

1991-02-04

1991-11-05

Oberleitner, Robert J.

Brakes

Wheel

Transversely movable

188106F, F16D 5146, F16D 6524

Patent

active

050625047

ABSTRACT:
A drum brake assembly having an automatic adjuster which adjusts the brake shoes for wear as needed during the service braking mode of operation. A spreader bar positioned between the brake shoes is capable of being acted upon by a parking brake actuating lever pivotally mounted on one of the brake shoes to transmit brake actuating forces through the spreader bar to one brake shoe and through the parking brake actuating lever to the other brake shoe to operate the brake assembly during the parking brake mode of operation. One end of the spreader bar is connected to the parking brake actuating lever to transmit tension force thereto during service braking apply, the other end of the spreader bar being connected to the other brake shoe so that service brake applying movement of that other brake shoe pulls the parking brake actuating lever to pivot it in the parking brake apply direction of lever movement. When the automatic adjuster adjusts the brake shoes for brake lining wear so that they are maintained close to the break drum in their fully released positions, the brake shoes are retracted somewhat less than they were before such adjustment. By moving the parking brake actuating lever as noted, it also is adjusted by not returning pivotally quite as far to the release position as before. Thus service brake automatic adjustment is effective through action of the spreader bar for the parking brake mode as well as the service braking mode of brake operation.

REFERENCES:
patent: 3255849 (1966-06-01), Swift
patent: 4039055 (1977-08-01), Meyer et al.
patent: 4456103 (1984-06-01), Muscat
patent: 4706783 (1987-11-01), Rath et al.
patent: 4809826 (1989-03-01), Charbonnier

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