Energy storage device with zero latching force

A zero latching force energy storage device comprising a first rod sliding along an axis X and subjected to axial thrust from a first spring, said rod being fixed at a first end to electromagnetic controlled latching means and being coupled at a second end to energy storage means, the latching means comprising a rod provided with a transverse bore which, in the set position, rceives a latching member controlled by an electromagnet, wherein the energy storage means include a second rod slidable along the same axis X and subjected to axial force from a second spring, with the free end of the second rod facing the free end of the first rod and being connected to means for coupling it to said first rod and for locking it when the latching member is in a set position, wherein the coupling and locking means comprise at least one arm provided at a first end with at least one bearing having an axis of rotation perpendicular to the axis X, said arm being movable at a second end about an axis extending parallel to the axis of rotation of each bearing and fixed to the free end of the second rod, together with a fixed cage provided with at least one running surface extending parallel to th direction of the axis and to the axes of each bearing, said fixed cage terminating in an at least a partially flared portion facing the second rod, and the first rod terminating at its second end in an end piece provided with at least a first plane bearing surface parallel to the running surface and having a tapering free end;

• whereby each bearing, when the latching member is in the set position, is contained between said first plane bearing surface and the flared portion of the cage in such a manner as to lock the second spring.