Linear actuator

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