Patent ID: 6920964
Filing Date: 2005-07-26
Classification: F16D

Abstract:
1. A brake actuating assembly for a wheeled vehicle, comprising: a hydraulically actuable brake piston for moving friction braking surfaces into a braking mode of operation to arrest wheel rotation; an axially reciprocal cam member having a first cam surface and a second cam surface; a first hydraulic circuit for supplying hydraulic fluid to axially translate said cam member from a brake released position to a first position during said braking mode of operation; second hydraulic circuit for supplying hydraulic fluid to axially translate said cam member from said first position to said brake released position on termination of said braking mode of operation; a resilient assembly for selectively engaging the second cam surface to obliquely move said cam member from a position of rest to an operational position in a first direction toward said brake piston during a parking brake mode of operation and temporally being compressed in an opposite second direction to allow said cam member to return to said brake released position; and wherein the first and second hydraulic circuits each include a hydraulic piston that engage a corresponding end of said cam member and respond to applied hydraulic pressure to translate said cam member; and wherein the first and second hydraulic circuits each further include a displacement piston that is resiliently biased to displace fluid away from a corresponding hydraulic piston subsequent to enablement of the corresponding hydraulic circuit.