Abstract: A damper comprises a piston rod which is disposed along a central longitudinal axis and extended out of an end of a casing through a guide and seal unit. A piston assembly on the end, inside the casing, of the piston rod divides the interior of the casing into two sectional casing chambers. A pressure-piston member and a traction-piston member of the piston assembly respectively comprise an flexibly deformable valve disk at a distance from their respective front walls. The piston assembly there-between comprises an annular piston which is movable relative to the piston rod along the axis between the valve disks in such a way that, by deformation conferred to the valve disk by the annular piston bearing against one of the valve disks, the valve disk rests on the associated piston member in such a way that a by-pass channel between the sectional casing chamber is at least narrowed.

Abstract: A gas spring with end positions damping has a cylindrical housing filled with a fluid under pressure, in which a piston rod, sealingly extending from one end of the housing, is disposed to be coaxially slideable and on the inner end of which a piston is attached. To create an end position damping that is simple in structure, and which can be used purely pneumatic, purely hydraulic or hydropneumatic, an auxiliary piston in the form of a throttle piston is slidingly disposed on the piston rod, which is supported via an energy accumulator towards the end of the housing where the piston rod exits. The piston abuts against this auxiliary piston at the end of the extension movement of the piston rod. Its throttle effect is larger during movement in the direction toward the end where the piston rod exits than in the opposite direction.