1. A DETONATOR MECHANISM COMPRISING, IN COMBINATION: (A) A HOUSING; (B) EXPLOSIVE CHARGE MEANS ARRANGED WITHIN SAID HOUSING; (C) A FIRING PIN ARRANGED WITHIN SAID HOUSING AND CONTINUOUSLY BIASSED FROM A REST POSITION TOWARD A FIRING POSITION IN WHICH SAID EXPLOSIVE CHARGE MEANS ARE DETONATED; (D) WEIGHT-RESPONSIVE LOCKING MEANS HAVING A BLOCKING ELEMENT, SAID LOCKING MEANS BEING CARRIED BY SAID HOUSING FOR MOVEMENT BETWEEN A DEPRESSED POSITION IN WHICH SAID BLOCKING ELEMENT ENGAGES SAID FIRING PIN TO PREVENT MOVEMENT OF THE LATTER FROM ITS REST POSITION TO ITS FIRING POSITION, AND A RELEASED POSITION IN WHICH SAID BLOCKING ELEMENT IS OUT OF THE PATH OF MOVEMENT OF SAID FIRING PIN, SAID LOCKING MEANS BEING ARRANGED CENTRALLY OF SAID HOUSING; AND