Fluid transfer type clutch actuator

Claim 1

A DOUBLE ACTING FLUID TRANSFER TYPE ACTUATOR FOR A PAIR OF AXIALLY SPACED CLUTCHES INTERPOSED BETWEEN A SHAFT AND GEARING MOUNTED THEREON, COMPRISING: AN ACTUATING CYLINDER MOUNTED COAXIALLY ON SAID SHAFT AND HAVING AXIALLY OPPOSITE ENDS SHIFTABLE THEREWITH BETWEEN POSITIONS OF ENGAGEMENT WITH SAID CLUTCHES, AN ANNULAR REACTION MEMBER WITHIN SAID CYLINDER MOUNTED ON AND SECURED AGAINST AXIAL MOVEMENT RELATIVE TO SAID SHAFT AND DIVIDING THE INTERIOR OF SAID CYLINDER INTO A PAIR OF LARGE PRESSURE CHAMBERS, WALLS WITHIN SAID CYLINDER RADIALLY OUTWARDLY OF SAID REACTION MEMBER DEFINING A CYLINDRICAL FACE IN SLIDING FLUID SEALING ENGAGEMENT WITH THE RADIALLY OUTER PERIPHERY OF SAID REACTION MEMBER AND DEFINING AN AXIALLY EXTENDING FLUID TRANSFER PASSAGE BETWEEN SAID LARGE PRESSURE CHAMBERS INDEPENDENT OF SAID SHAFT AND REACTION MEMBER, A PAIR OF AXIALLY SPACED AND RADIALLY OUTWARD FACING CYLINDRICAL SURFACES FORMED ON OPPOSITE SIDES OF SAID REACTION MEMBER RADIALLY INWARDLY FROM SAID CYLINDRICAL FACE, ANNULAR PISTONS DISPOSED BETWEEN SAID CYLINDRICAL FACE AND SAID CYLINDRICAL SURFACES, RESPECTIVELY, DEFINING THEREWITH A PAIR OF SMALL PRESSURE CHAMBERS, EACH OF SAID PISTONS BEING SHIFTABLE AXIALLY OUTWARDLY RELATIVE TO SAID CYLINDER FROM A POSITION OF FLUID TRANSFER TO A POSITION OF SEALING ENGAGEMENT WITH ONE OF SAID ENDS OF SAID CYLINDER IN WHICH FLUID TRANSFER BETWEEN SAID LARGE PRESSURE CHAMBERS IS PREVENTED AND MEANS BIASING SAID ANNULAR PISTONS TO THEIR FLUID TRANSFER POSITION IN WHICH FREE FLOW OF FLUID IS PERMITTED BETWEEN SAID LARGE PRESSURE CHAMBERS THROUGH SAID FLUID TRANSFER PASSAGE.