Fluid pressure actuator and locking means

Claim 1

A DOUBLE ACTING FLUID PRESSURE ATUATOR AND LOCKING MEANS COMPRISING AN ELONGATED HOLLOW CYLINDER, EACH END SURFACE OF SAID CYLINDER BEING BEVELED OUTWARDLY, A CYLINDER HEAD RECEIVED ON ONE END OF SAID CYLINDER, AN INWARDLY OPENING ANNULAR RECESS BETWEEN SAID HEAD AND THE ADJACENT END OF SAID CYLINDER, MEANS ON SAID HEAD FOR ATTACHING THE SAME TO A COOPERATING STRUCTURE, A FLUID PRESSURE INLET IN SAID HEAD COMMUNICATING WITH SAID CYLINDER, A PISTON SLIDABLY RECEIVED IN SAID CYLINDER, A PISTON ROD CONNECTED TO SAID PISTON AND PROJECTING FROM THE OPPOSITE END OF SAID CYLINDER, A SECOND CYLINDER HEAD RECEIVED ON THE OPPOSITE END OF SAID CYLINDER AND SURROUNDING SAID PISTON ROD, A SECOND INWARDLY OPENING ANNULAR RECESS BETWEEN SAID SECOND HEAD AND THE ADJACENT END OF SAID CYLINDER, A SECOND FLUID PRESSURE INLET IN SAID SECOND HEAD COMMUNICATING WITH SAID CYLINDER, A CENTRAL AXIAL BORE IN EACH END OF SAID PISTON, A RADIAL APERTURE IN EACH END OF SAID PISTON COMMUNICATING WITH SAID BORE, A SECOND BORE IN EACH END OF SAID PISTON CONCENTRIC WITH SAID FIRST BORE AND OF SMALLER DIAMETER, A PLUNGER SLIDABLY DISPOSED IN EACH OF SAID SECOND BORES, A FLUID PRESSURE PASSAGE IN SAID PISTON BETWEEN THE FIRST BORE IN ONE END OF SAID PISTON AND THE SECOND BORE IN THE OPPOSITE END OF SAID PISTON, A SECOND FLUID PRESSURE PASSAGE BETWEEN THE FIRST BORE IN SAID OPPOSITE END OF SAID PISTON AND THE SECOND BORE IN SAID ONE END OF SAID PISTON, SPRING MEANS FOR URGING EACH PLUNGER AXIALLY OUTWARDLY OF SAID PISTON, A LOCKING DETENT SLIDABLY DISPOSED IN EACH OF SAID RADIAL APERTURES, BEVELED SURFACES ON THE OUTER ENDS OF SAID DETENTS FOR ENGAGING THE BEVELED END SURFACES ON SAID CYLINDER AND MEANS FOR MOVING SAID DETENTS OUTWARDLY AND LOCKING THE SAME IN OUTWARD POSITION, SAID MEANS COMPRISING A ROLLER ROTATABLY MOUNTED IN A RECESS IN SAID DETENT, SAID ROLLER HAVING A PART THEREOF COOPERATING WITH A SURFACE ON SAID PLUNGER, EACH ELEMENT BEING MOVABLE BETWEEN A LOCKED AND UNLOCKED POSITION, WHEREBY WITH SAID PISTON AT ONE END OF SAID CYLINDER A DETENT WILL BE MOVED OUTWARDLY INTO THE ADJACENT ANNULAR RECESS AND LOCKED IN POSITION BY SAID ROCKABLE ELEMENT TO LOCK SAID PISTON AGAINST MOVEMENT, AND UPON ADMISSION OF FLUID PRESSURE INTO ONE END OF SAID CYLINDER THE PLUNGER AT THAT END OF SAID PISTON WILL BE FORCED INWARDLY TO RELEASE SAID DETENT TO PERMIT INWARD MOVEMENT THEREOF AND MOVEMENT OF SAID PISTON TO THE OPPOSITE END OF SAID CYLINDER, THE SPRING AT THE OPPOSITE END OF SAID PISTON AND FLUID PRESSURE THROUGH THE PASSAGE TO THE SECOND BORE AT SAID OPPOSITE END OF SAID PISTON SERVING TO MOVE THE PLUNGER AT SAID OPPOSITE END OF SAID PISTON AND ITS ASSOCIATED DETENT OUTWARDLY AND LOCK THE SAME IN THE ANNULAR RECESS AT THE OPPOSITE END OF SAID CYLINDER BY SAID ROCKABLE ELEMENT TO LOCK SAID PISTON AGAINST MOVEMENT IN THE OPPOSITE DIRECTION.