Actuator system and multifunctional table comprising such an actuator system

Actuator system (100) for a table (200) having at least two table legs (210) of variable length and a table top (220) held by the table legs (210), the actuator system (100) comprises at least two master cylinders (10), each having a cylinder (10a) and a piston (10b) movable in the cylinder (10a) and a piston rod (10c) for moving the piston (10b), wherein a slave cylinder (20) having a cylinder (20a) and a piston (20b) movable in the cylinder (20a) for changing the length of the table leg (210) is connected to each of the master cylinders (10) by means of a conduit (40) allowing fluid (30) flow between the master cylinder (10) and the slave cylinder (20), and wherein the piston rods (10c) of the master cylinders (10) are mechanically connected to each other by means of a rigid connecting element (45), and wherein a drive unit (52) in a rigid drive connection (50) with the connecting element (45) is connected to the connecting element (45) for simultaneously moving the pistons (10a) of the master cylinders (10), characterized in that the connecting element (45) is fastened to a ball nut (51b) of a ball screw (51a), the first end (51a′) of the ball screw (51a) is fixed to allow the ball screw (51a) to rotate about an axis, and the second end (51a″) of the ball screw (51a) is connected to the drive unit (52) via a clutch (56), which clutch (56) comprises a fixed stationary part (56a) and a movable part (56b) connected to the second end (51a″) and the drive unit (52) for rotation about the axis of the ball screw (51a) relative to the stationary part (56a), which movable part (56b) is connected to the second end (51a″) via a freewheel (55) which closes when the ball screw (51a) rotates in one axial direction and which opens when the ball screw (51a) rotates about the other axial direction, and there is a frictional connection between the movable part (56b) and the stationary part (56a).