Abstract: An actuator for variable adjustment of the pistons in hydraulic slave cylinders for regulation of for example the elevation adjustment of work stations. The pistons are actuated by way of a pusher which is non-rotatable but axially displaceable in the actuator housing (10). In the housing (10) there are provided one or more oblong openings (22) for drivers (27) attachable to the pusher and arranged for cooperation with the corresponding pusher in one or several further actuators placeable close to the actuator and that in at least one of the connected actuators there is arranged a threaded spindle for cooperation with a pusher designed as a nut.

Abstract: An adjustment means for variable height adjustment of hydraulically or pneumatically operable supports, e.g. legs on tables, chairs, beds etc., adjustment means for simultaneously raising and lowering all supports and for separately adjusting each of said supports to suit the contour of the floor surface or similar foundation comprised of pressure chambers (13) in the housing (11) of the adjustment means (10), the number corresponding to the number of supports, each pressure chamber having a piston (14), which by way of an adjusting screw (15) cooperates with a driving nut (16), which is unrotatably but axially displaceably arranged in the housing. The driving nut is displaced by means of a threaded spindle (17) which is rotatably but undisplaceably mounted in the housing.