Underwater grenade

A method for defending against underwater attack comprising:

• providing a submersible grenade for underwater application having enclosed within a casing an interface section, a depth pressure activated safe and arm logic section, an initiating section, and an explosive section including an explosive charge;
• providing operative coupling between each said section enclosed within said casing;
• providing within said interface section a tamper prevention device, a device for manually selecting a detonation depth, and to initiate the operation of said grenade;
• setting the grenade denotation depth manually at the time of grenade operation by said device for manually selecting a detonation depth of said interface section;
• providing a power supply within said casing, operatively coupled to each said section enclosed within said casing;
• providing within said depth pressure activated safe and arm logic section, a sensing initial environmental conditions device, a sensing subsequent environmental conditions device, detecting and determining water depth via sensing of environmental pressure for both arming and firing, and determining whether a plurality of predetermined conditions for arming said safe and arm logic section are satisfied;
• submersing said grenade adjacent said attackers;
• arming said safe and arm logic section when said predetermined conditions for arming said safe and arm logic section are satisfied;
• activating said initiating section when said armed safe and arm logic section senses said manually set detonation depth;
• and
• activating said explosive section when said initiating section is activated to detonate said explosive charge.

A submersible anti-swimmer grenade comprising:

• a hollow casing;
• a pressure transducer adapted to provide an output representative of external depth pressure disposed within said casing;
• said pressure transducer operably coupled with a safe and arm logic device disposed within said casing;
• said safe and arm logic device having a manually selectable depth pressure threshold setting for manually selecting the depth pressure threshold setting at the time of operation of the submersible grenade;
• said safe and arm logic device operably coupled with an initiating section including a self-triggering fireset disposed within said casing;
• said fireset operably coupled with an explosive charge disposed within said casing;
• said pressure transducer, said safe and arm logic device, and said initiating section each operably coupled with an electrical power supply disposed within said casing;
• said safe and arm logic device adapted to cause operation of said initiating section in response to said pressure transducer output corresponding to the manually selected depth pressure threshold setting, pressure is measured by said device, sensing environmental pressure includes said pressure transducer for pressure measurements and logic for comparing the measurements to a fixed separation depth and to a firing depth;
• and
• said fireset operable to cause explosive charge detonation upon operation of said initiating section.

A submersible grenade for underwater application comprising:

• a casing;
• a plurality of sections disposed within said casing;
• said plurality of sections including a power supply section operatively coupled with an interface section, a depth pressure activated safe and arm logic section, an initiating section, and an explosive section;
• said interface section having a tamper protection device and means to at the time of grenade operation manually select, within a predetermined range, the grenade detonation depth;
• said interface section operatively coupled with said depth pressure activated safe and arm logic section;
• said depth pressure activated safe and arm logic section including a sensing depth pressure device, pressure is measured by said device, sensing environmental pressure includes a pressure transducer, for pressure measurements and logic for comparing the measurements to a fixed safe separation depth and to a firing depth and determining whether predetermined conditions for arming said grenade are satisfied;
• said initiating section operatively coupled with said depth pressure activated safe and arm logic section;
• said explosive section, including an explosive charge, operatively coupled with said initiating section;
• and
• said initiating section operative to initiate detonation of said explosive charge when conditions for arming said grenade are satisfied and said manually selected detonation depth is reached.