Abstract: The invention relates to an automatic mechanical apparatus comprising a container (1) placed within the equipment to be freed and from which leave two cables (3) within sheaths (2) which connect two controls retaining the loops of the equipment in the suspension straps worn by the parachutist.The apparatus serves to exert a simultaneous pulling on the two cables (3) with a sufficient delay to cause the liberation of the equipment, after opening and stabilization of the parachute.To this end, the container (1) contains a plunger (48) which is maneuverable by an inertia due to the deceleration caused by the opening of the parachute, the activation of a spring motor (25) having a decelerator whose slow rotation causes the delayed unlatching of a detent spring (11) causing the oscillation of a return lever (9) of the cables (3) for liberation of the equipment.