Linear actuator

The linear actuator (8) comprises quick release means (27) for disengaging the adjustment element (23) from the electric motor (19) and from a part of the transmission (20) extending from the electric motor (19) towards the quick release means (27) for rotating the spindle (21) of the linear actuator under the load on the adjustment element (23). Furthermore, the linear actuator comprises a braking device (28) connected to the spindle (21) for controlling the speed of the adjusting element (23) when the quick release device (27) is driven. The coupling (34; 52, 53, 54) connected to the brake device (28) is arranged to bring the brake device (28) into an active state when the coupling (34; 52, 53, 54) is engaged or to bring the brake device (28) into an inactive state when the coupling (34; 52, 53, 54) is slid or disengaged.