| abstract |
A water-armed, air-safe fuze for hand grenades, bombs, mines and torpedoes which permits initiation of the main charge only when the device is underwater. A floodable chamber having flooding holes open to the environment is intermediate an explosively driven piston and a percussion primer. When water fills the floodable chamber, sufficient forces will be transmitted from the driver piston to an intermediate firing pin which will be ejected toward the percussion primer to initiate the main charge in the ordnance. When air fills the chamber, insufficient forces will be transmitted and the device will be safetied. |