Sleeve for a drum brake adjuster screw

Details Sleeve for a drum brake adjuster screw Sleeve for a drum brake adjuster screw

1993-12-28

1995-01-03

Oberleitner, Robert J.

Brakes

Wheel

Transversely movable

188 78, 411373, F16D 5120, F16B 3714

Patent

active

053777930

ABSTRACT:
An automotive drum brake assembly includes first and second brake shoes mounted on a backing plate. A wheel cylinder for braking actuation is mounted between the brake shoes. An adjuster screw assembly is held between the brake shoes by an adjuster spring. The adjuster screw assembly includes a pivot nut threaded onto an adjuster screw. In one embodiment, a sleeve includes a first portion slidably mounted on the pivot nut, a second ramp portion covering the screw threads and a third portion opposite the pivot nut. The second portion, preferably formed as a frustoconical ramp, is slid by the adjuster spring to travel with the adjuster screw as it unthreads from the pivot nut, thereby shielding threads from corrosive elements.

REFERENCES:
patent: 2775315 (1956-12-01), Maruhn et al.
patent: 3357527 (1967-12-01), Bauman et al.
patent: 3375907 (1968-04-01), Moyer
patent: 3744595 (1973-07-01), Adams
patent: 3949845 (1976-04-01), Newstead et al.
patent: 4026394 (1977-05-01), Wright
patent: 4061429 (1977-12-01), Mathues
patent: 4132488 (1979-01-01), Strong
patent: 4400123 (1983-08-01), Dunegan

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