Patent ID: 7870818

Claim:
A piston-cylinder assembly comprising: a working cylinder; a one-piece stamped and formed piston body which is attached to a piston rod, the piston body being axially movable in the cylinder and dividing the cylinder into two working spaces; at least one first opening in the piston body, the first opening being provided with a first valve for passing fluid when the piston moves in a pull direction, the first valve comprises: a disk that releases said at least one first opening when said piston rod moves out of said cylinder, and closes said at least one first opening when said piston rod moves into said cylinder; and a spring which loads said disk against said first opening, at least one second opening in the piston body, the second opening being provided with a second valve for passing fluid when the piston moves in a push direction; and a seal between a circumferential surface of the piston body and the working cylinder, said piston body formed with a circumferential flange which supports said spring.