Piston sealing and dampening device

In the combination of a piston sealing and dampening device in a pressurized-fluid cylinder, having a cylinder tube, cylinder end caps situated at the ends of the cylinder tube, and a piston movable inside the cylinder tube between said end caps, at least one end cap having a central sleeve portion projecting into the cylinder chamber and being provided with an internal pressurized-fluid connection, the piston having a central recess facing towards said at least one end cap such that when the piston is in the vicinity of an end position adjacent said at least one end cap this recess accommodates said sleeve portion, the piston sealing and dampening device including radially inner and outer sealing ring lips adapted such that, during movement of the piston towards said end position under dampening action, these lips seal off an annular space between the cylinder tube and said sleeve portion, characterized in that the piston sealing and dampening device comprises an integrated sealing ring including:

• a radially inner part with said inner sealing ring lip for sealing engagement against said sleeve portion under said dampening action;
• an intermediate web portion situated in the region of an end surface of the piston facing towards said at least one end cap;
• and
• a radially outer part with said outer sealing ring lip for sealing engagement against the inside of the cylinder tube;
• and,
• the sealing ring being fastened to the piston at least in said radially outer part such that the inner sealing ring lip is at least partially displaceable from said sleeve portion during the initial stage of the piston movement away from said at least one end cap.