Actuator for a parking brake

Details Actuator for a parking brake Actuator for a parking brake

1997-12-12

1999-09-28

Oberlietner, Robert J.

Brakes

Wheel

Transversely movable

188 7964, 188250F, 188325, 188336, F16D 5100

Patent

active

059572477

ABSTRACT:
A drum-in-hat brake assembly (10) having first (12) and second (14) brake shoes retained on a backing plate (16) by first (18) and second (20) pins connected to the backing plate (16). The first (12) and second (14) brake shoes are aligned on the backing plate (16) by an anchor post (40) and connected to a reverse actuator (26). The reverse actuator (26) receives an input force to respectively move first (42) and second (44) friction pads associated with the first (12) and second (14) brake shoes into engagement with a drum (46) to effect a brake application. The reverse actuator (26) includes a first lever (52) and a second lever (54), each of which have a flat plate (60,76) that extends through an opening (62) in the backing plate (16). A resilient member (90) located in the opening (62) maintains the flat plates (60,76) in a same perpendicular plane with respect to the backing plate (16). The first (52) and second (54) levers which are connected to the first (12) and second (14) brake shoes and to each other through a semi-circular indentation (70) on the first lever (52) adjacent a first end (56) which receives a semi-circular projection (82) extending from a first end (72) on the second lever (54). A spring (48,50) acting through the first (12) and second (14) brake shoes which holds the semi-circular projection (82) in the semi-circular indention (70) to separate a second end (58) on flat plate (60) from a second end (74) on flat plate (76). An actuation cable (91) connected to the second ends (58,74) provides an input force which causes one of the first (52) and second (54) levers to pivot about the semi-circular indentation (70) and move the second ends (58,74) toward each other while the first ends (56,72) correspondingly move away from each other to provide an input force to effect a brake application.

REFERENCES:
patent: 1970680 (1934-08-01), Williams
patent: 2024137 (1935-12-01), Adams
patent: 2069344 (1937-02-01), White
patent: 3420340 (1969-01-01), Hopf
patent: 5180037 (1993-01-01), Evans
patent: 5311971 (1994-05-01), Courbot
patent: 5529149 (1996-06-01), Johannesen et al.
patent: 5531298 (1996-07-01), Brooks

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