Patent ID: 8522934

Claim:
A lockable piston-cylinder unit comprising: a cylinder having a closed first end, a second end with a seal, and at least one axially facing counterstop; a piston axially movable in the cylinder, the piston dividing the cylinder into a first working chamber and a second working chamber; a piston rod connected to the piston and extending through the first working chamber and the seal, the piston rod having a free end outside the cylinder and being extendable by a stroke to a maximum extension; and a fastening tube having a closed first end to which the free end of the piston rod is fixed, an open second end which receives the cylinder coaxially, a length greater than the stroke, and at least one axially facing supporting stop that is axially fixed with respect to the length of the fastening tube, wherein, when the piston rod is extended to the maximum extension, the fastening tube is rotatable relative to the cylinder from a release position for adjustment, wherein said at least one axially fixed supporting stop is rotatably offset from a respective said at least one counterstop to a locking position, wherein the axially fixed supporting stop faces the counterstop so that the fastening tube cannot move axially relative to the cylinder.