Snap-hook with a locking bolt

A snap-hook comprising a C-shaped fixed body, having a first end shaped as a securing element and a second end for articulation of a movable finger around a pivoting spindle between a closed position and an open position, said finger comprising:

• a latching element situated opposite the pivoting spindle to cooperate with the securing element in the closed position,
• a return spring to return the finger to the closed position,
• a locking ring mounted coaxially around the finger between a first locked position enabling positive locking of the finger in the closed position to be achieved and a second unlocked position enabling the finger to be moved to the open position, said ring being of a smaller length than that of the finger and being permanently separated from the spindle by an axial gap,
• wherein the finger is equipped with a locking bolt having an operating component designed to cooperate alternately with a hole or a notch arranged in the locking ring with a preset angular offset, respectively in the first locked position to perform said positive locking in rotation of said ring when the operating component is inserted in the hole, and in a second unlocked position with formation of an internal link with a hang-up between the ring and said finger when the operating component engages in the notch, movement from the second unlocked position to the first locked position being achieved manually by a rotational movement of the ring causing the hang-up to be released at the beginning of travel following the reaction of the ring on the operating component, and insertion of the operating component in the hole at the end of travel for positive locking of the ring in rotation.