Pressure rise delaying valve for hydraulically actuated clutches

Claim 1

THE COMBINATION COMPRISING: A FRICTION CLUTCH INCLUDING A HYDRAULIC ACTUATOR; A SUPPLY PASSAGE CONNECTED TO SAID ACTUATOR; AND A DEVICE FOR REGULATING THE TIME REQUIRED TO REACH A PRESSURE OF PREDETERMINED VALUE IN SAID SUPPLY PASSAGE INCLUDING A HOUSING HAVING A PRESSURE CHAMBER, AN INLET CONNECTED TO SAID SUPPLY PASSAGE, AN OUTLET ADAPTED FOR CONNECTION OT A RESERVOIR AND A VALVE SEAT INTERMEDIATE SAID INLET AND OUTLET, A MOVABLE VALVE MEMBER HAVING A CLOSED POSITIONWHEN SEATED ON SAID SEAT, A PLUNGER RECIPROCABLY MOUNTED IN SAID PRESSURE CHAMBER, A BIASING SPRING INTERPOSED BETWEEN SAID PLUNGER AND SAID MOVABLE VALVE MEMBER, AND FLOW RESTICTING MEANS BETWEEN SAID SUPPLY PASSAGE AND SAID PRESSURE CHAMBER INCLUDING A BIASED ONE WAY PILOT VALVE MOVING FROM A CLOSED POSITION TO AN OPEN POSITION UPON THE PRESSURE IN SAID SUPPLY PASSAGE EXCEEDING THE PRESSURE IN SAID PRESSURE CHAMBER BY A PREDETERMINED VALUE, SID PILOT VALVE PREVENTING FLOE THROUGH SAID FLOW RESTRICTING MEANS IN THE DIRECTION FROM SAID PRESSURE CHAMBER TO SAID SUPPLY PASSAGE.