Patent ID: 7377141

Claim:
Device for locking and unlocking a cover or lid on a frame by means of a key, comprising: a lock whose element forming the locking bolt receiver is integral with the frame, and the element forming the locking bolt is integral with the cover which has an opening for access of the key to the element forming the locking bolt, which key comprises an arm having a spur-shaped operating device disposed at one end of the arm allowing the element forming the locking bolt to be operated, when the key is inserted in the opening of the cover, from a locked position in which the element forming the locking bolt is held confined in the locking bolt receiver to an unlocked position for which the element forming the locking bolt is released from the locking bolt receiver and the key is held confined in the opening of the cover; wherein the element forming the locking bolt comprises an elastically deformable rod protruding beneath the cover appreciably perpendicular to said cover and terminating in a hook-shaped free end suitable for engaging under a rib or rigid tab of the receiver of the frame to lock the cover to the frame; wherein the spur-shaped operating device permits elastic movement of the rod to disengage the hook-shaped end from the rib or rigid tab when the key is inserted in the opening of the cover and turned from a specific angle around the longitudinal axis of the arm of the key so as to unlock the cover; and wherein the spur-shaped operating device of the key has an internal concavity at a free end in which the rod of the locking bolt is held in position separated from the rib or tab when the key is in a position of unlocking the cover.