Snap-hook with locking ring

A snap-hook, notably for mountain climbing, comprising a C-shaped metallic body, having a first end provided with a male securing part, and a second end for articulation of a mobile finger around a pivoting spindle between a closed position and an open position, said finger comprising:

• a female securing part arranged opposite the pivoting spindle to cooperate with the male securing part in the closed position,
• a first return spring to return the finger to the closed position,
• a locking ring mounted with limited rotation coaxially around the finger between a first locking position and a second unlocking position, said ring comprising memory means to keep it in the second unlocking position so long as the finger is open,
• a second return spring to return the locking ring to the first locking position when the finger is closed,
• a locking bolt arranged on said finger for cooperating in the active position with the ring to lock the latter positively in the first locking position,
• and operating means to actuate the locking bolt to an inactive position allowing rotation of the ring to the second unlocking position.