Articulation system comprising first and second articulations, each comprising two fittings which are pivotable relative to one another and a locking mechanism which comprises a control member which is mobile between a locked position and an unlocked position, the control members each being urged in a resilient manner into the locked position by a return member, a maneuvering member which is mobile in rotation between a neutral position, a position of misuse and an actuating position, in order to unlock the control members when said maneuvering member is displaced in a first direction, said maneuvering member being returned from the position of misuse and the actuating position into the neutral position by a dual-action return device.