Fluid pressure actuator and locking means

Claim 1

A DOUBLE ACTING FLUID PRESSURE ACTUATOR AND LOCKING MEANS COMPRISING AN ELONGATED HOLLOW CYLINDER, EACH END SURFACE OF SAID CYLINDER BEING BEVELED OUTWARDLY, A CYLINDER HEAD THREADEDLY 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, PACKING MEANS ON SAID PISTON ENGAGING THE WALL OF SAID CYLINDER IN FLUID TIGHT RELATIONSHIP, A PISTON ROD CONNECTED TO SAID PISTON AND PROJECTING FROM THE OPPOSITE END OF SAID CYLINDER, A SECOND CYLINDER HEAD THREADEDLY RECEIVED ON THE OPPOSITE END OF SAID CYLINDER AND SURRONDING SAID PISTON ROD, PACKING MEANS ON SAID SECOND CYLINDER HEAD ENGAGING SAID PISTON ROD IN FLUID TIGHT RELATIONSHIP, 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, PACKING MEANS ON EACH PLUNGER ENGAGING THE WALL OF THE ASSOCIATED BORE IN FLUID TIGHT RELATIONSHIP, 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