Patent ID: 9739329
Date: 2017-08-22
CPC Classifications: F16F

Claim:
1. A lockable piston-cylinder unit comprising: a cylinder that is closed at both ends and filled with a pressurized fluid; a guiding and sealing unit that closes one end of the cylinder; a piston, which divides the interior of the cylinder into a first working chamber and a second working chamber, is displaceably guided in the cylinder and sealed relative to an inner wall of the cylinder; a piston rod arranged at the piston and guided out of the cylinder through one of the working chambers and through the guiding and sealing unit; a stop; an actuation element movable between an actuation position and a non-actuation position, the actuation element configured to contact the stop in the non-actuation position; an actuation rod arranged to be axially displaceable, a first end of the actuation rod projects out of the cylinder and is configured to be acted upon by the actuation element to be movable in a push-in direction of the actuation rod; and a blocking valve that provides a connection between the first working chamber and the second working chamber and having a valve slide that can be acted upon in a closing direction by a pressure in the first working chamber and acted upon by a second end of the actuation rod in an opening direction of the blocking valve to be axially displaceable by a displacement between a closed neutral position and its open position, wherein the valve slide in its closed neutral position without contacting a fixed stop is forced in closing direction by the pressure in the first working chamber and is permanently supported at the actuation element via the actuation rod and in constant contact with the stop and an end portion of the slide opposite the stop is spaced apart from the piston, wherein the valve slide is arranged beyond the piston.