FLUID PRESSURE CYLINDER

摘要

A lock unit housing (13) in which two lock units (29, 129) are assembled inverted to each other is attached to a drive cylinder (12) where a piston rod (14) is assembled, and the piston rod (14) projects to the outside from the head of the lock unit housing (13). Each of the lock units (29, 129) has a retainer (37) for receiving steel balls (36) and a lock sleeve (38) provided outside the retainer. On the lock unit housing (13) are installed lock cylinders (17, 117) for driving fastening rods (45, 145). The fastening rods (45, 145) drive the corresponding lock sleeves (38) into a fastened state and a fastening-released state. To fix the piston rod (14), one (45) of the fastening rods drives the lock sleeve (38) into a fastened state prior to driving the other fastening rod (145).