Patent ID: 8360215
Filing Date: 2013-01-29
Classification: F16D

Abstract:
1. A two-stage slave cylinder comprising a housing, a bore in said housing, an outer piston in said bore in said housing movable between an unactuated position and an actuated position, a bore in said outer piston, an inner piston in said bore in said outer piston movable between an unactuated position and an actuated position, an outer piston chamber formed by said bore in said housing and said outer piston, an inner piston chamber formed by said bore in said outer piston and said inner piston, an opening in said outer piston providing fluid communication between said outer piston chamber and said inner piston chamber, and a valve assembly positioned in said opening to control hydraulic fluid flow between said inner piston chamber and said outer piston chamber, said valve assembly adapted to close upon movement of said outer piston from the unactuated position, the closing of said valve assembly trapping a volume of fluid within said inner piston chamber, said valve assembly engaging a projection extending from said housing into said opening to maintain said valve assembly in an open position when said outer piston is in the unactuated position.