Abstract: A fluid spring has a cylindrical housing (1) in whose end sections pieces (12,13) are introduced. A hollow space (20) is configured in one of these end pieces (12), a control device (30) being located in the hollow space (20). The control device (30) has two sealing devices (31,32) and an actuating rod (33) which connects them. The planes of the sealing devices (31,32) do not run parallel to each other.

Abstract: The support comprises a sleeve (20) for guiding an arrangement (10) for the adjusting of the length of the support, whereby this guiding sleeve (20) is inserted in a guiding tube (1). The guiding sleeve (20) has a tubular piece (21), the longitudinal axis of which lies on the main axis A of the support. From the outer surface (23) of the tubular piece (21), outer ribs (22) protrude, which extend up to the interior surface (24) of the guiding tube (1). From the inside (43) of the tubular piece (21), interior ribs (42) protrude, which extend from the interior side (43) of the tubular piece (21), interior ribs (42) protrude, which extend from the interior side (43) of this tubular piece (21), against the main axis A of the support. The front area (40) of the interior rib (42) has a curved front face (39), the radius of the curvature corresponds to the curvature radius of the outer wall (14) of the adjusting equipment (10).