Fluid power actuated butterfly valve or plug cock

Claim 1

MEANS FOR ACTUATING A BUTTERFLY VALVE COMPRISING A VALVE BODY, A ROTATABLE SPINDLE FOR SAID VALVE, AN AXIALLY MOVABLE ACTUATING ROD DISPOSED IN ALIGNMENT WITH SAID ROTATABLE SPINDLE, A MEMBER FIXEDLY CONNECTED TO SAID VALVE BODY EXTENDING AXIALLY THROUGHOUT ITS LENGTH HAVING A SLOT, A CYLINDRICAL MEMBER SURROUNDING SAID ACTUATING ROD MOUNTED FOR MOVEMENT ONLY CONNECTED TO SAID SPINDLE SO AS TO BE RESTRAINED FROM ROTATION RELATIVE TO SAID SPINDLE HAVING A SLOT HAVING A SUBSTANTIALLY HELICAL CONFIGURATION WITH AXIAL END PORTIONS CONCENTRIC WITH SAID FIRST NAMED SLOT, ONE OF SAID AXIAL END PORTIONS LOCKING SAID VALVE IN CLOSED POSITION, SAID ACTUATING ROD HAVING AT LEAST ONE RADIAL PROJECTION COOPERATING WITH THE EDGES OF SAID TWO CONCENTRIC SLOTS, THE HELICAL CONFIGURATION OF SAID SECOND NAMED SLOT IN SAID CYLINDRICAL MEMBER COMPRISING TWO SECTIONS WHICH ARE AT AN ANGLE RELATIVE TO EACH OTHER, ONE OF SAID SECTIONS WHICH IMMEDIATELY FOLLOWS THE AXIAL END PORTION WHICH LOCKS THE VALVE IN ITS CLOSED POSITION BEING AT A SMALLER ANGLE TO THE AXIS OF SAID CYLINDER THAN THE OTHER OF SAID HELICAL SECTIONS, A THREADED SPINDLE MOUNTED FOR ROTARY MOVEMENT ONLY IS PROVIDED AND SAID ACTUATING ROD IS HOLLOW AND IS INTERNALLY THREADED OVER PART OF ITS LENGTH TO COOPERATE WITH SAID THREADED SPINDLE TO ENABLE THE VALVE TO BE OPENED AND CLOSED MANUALLY.