Overload release clutch with fluid lockout

Claim 1

IN A ROTARY TOOL HAVING A MOTOR, A DRIVESHAFT DRIVEN BY SAID MOTOR, A SPINDLE ADAPTED TO BE DRIVEN BY SAID DRIVESHAFT, AND A TORQUE-RESPONSIVE CLUTCH INCLUDING TWO ENGAGEABLE CLUTCH JAWS INTERCONNECTING SAID DRIVESHAFT AND SAID SPINDLE FOR TRANSMITTING A TORQUE LOAD FROM SAID DRIVESHAFT TO SAID SPINDLE AND BEGIN AXIALLY MOVABLE RELATIVE TO EACH OTHER TO DISENGAGE SAID DRIVESHAFT FROM SAID SPINDLE IN RESPONSE TO THE TORQUE LOAD RISING TO A PREDETERMINED TORQUE LOAD, THE COMBINATION COMPRISING: (A) CLUTCH DISENGAGING MEANS INCLUDING A CYLINDER ELEMENT AND A PISTON ELEMENT SLIDABLY CONTAINED IN SAID CYLINDER ELEMENT; (B) SAID PISTON ELEMENT DIVIDING SAID CYLINDER ELEMENT INTO TWO SUBSTANTIALLY CLOSED PRESSURE CHAMBERS; (C) ONE OF SAID ELEMENTS BEING CONNECTED TO ONE OF SAID CLUTCH JAWS; (D) THE OTHER ELEMENT BEING ANCHORED AGAINST AXIAL MOVEMENT RELATIVE TO SAID ONE CLUTCH JAW; (E) A CONDUIT TO SUPPLY PRESSURE FLUID TO EACH OF SAID CHAMBERS TO CREATE AN EQUAL PRESSURE IN BOTH OF SAID CHAMBERS; (F) AND VENT MEANS CONNECTED TO SAID CLUTCH JAWS TO EXHAUST ONE OF SAID CHAMBERS IN RESPONSE TO THE INITIAL DISENGAGEMENT OF SAID CLUTCH JAWS AFTER REACHING SAID PREDETERMINED TORQUE LOAD TO CREATE A PRESSURE DIFERENTIAL BETWEEN CHAMBERS; (G) SAID PRESSURE DIFFERENTIAL ACTING IN A DIRECTION CAUSING SAID ONE CLUTCH JAW TO BE ENTIRELY DISENGAGED FROM THE OTHER OF SAID CLUTCH JAWS.