Percussion release hook

Claim 1

A PELICAN TYPE COUPLING HOOK EMPLOYING AN EXPLOSIVE BOLT CATCH AND RELEASE MECHANISM COMPRISING, (A) A HOOK SHANK SUSPENDED FROM A SUPPORTING CABLE, (B) A HOOK HINGED TO SAID SHANK BY A PIVOT PIN, (C) A SLOT IN SAID HOOK BETWEEN THE BOLT CATCH AND PIVOT PIN, (D) AN ANCHOR CABLE DETACHABLY SUPPORTED BY A SHACKLE PIN IN SAID SLOT, (E) SAID SUPPORTING CABLE, ANCHOR CABLE, AND SHACKLE PIN BEING IN VERTICAL ALIGNMENT WHEN UNDER LOAD; (F) SAID LINE OF VERTICAL ALIGNMENT BEING OUTSIDE THE AXIS OF SAID HINGE PIVOT PIN SO THAT UPON RELEASE THE FORCE OF GRAVITY ON SAID SHACKLE PIN WILL TEND TO SWING THE HOOK ON SAID HINGE PIVOT PIN AWAY FROM THE SHANK AND RELEASE THE SHACKLE PIN, (G) A BOLT CATCH IS LOCATED IN ALIGNED KEEPER HOLES THROUGH SAID SHANK AND HOOK RESPECTIVELY FOR SECURING SAID HINGED HOOK TO SAID SHANK IN A CLOSED POSITION, (H) SAID CATCH BOLT BEING HOLLOW AND FILLED WITH AN EXPLOSIVE CHARGE, (I) DETONATING MEANS CONNECTED THROUGH SAID BOLT HEAD TO SAID EXPLOSIVE CHARGE, (J) A BOLT HEAD CHAMBER FOR PROTECTING THE ARMED BOLT FROM HYDROSTATIC PRESSURE, (K) A SEALED HORIZONTAL OPENING IN SAID CHAMBER FOR ASSEMBLING SAID CATCH BOLT IN ITS ARMED POSITION, (L) A STUFFING BOX CONNECTED TO SAID CHAMBER FOR PROVIDING A WATERTIGHT DETONATING CABLE CONNECTION TO SAID CHAMBER; (M) THE ADJACENT SURFACES OF SAID SHANK AND HOOK SURROUNDING SAID BOLT BEING SEPARATED APPROXIMATELY 1/16 OF AN INCH APART FOR FORMING AN UNSUPPORTED PERIPHERAL BREAK LINE AND A SPACING SO THAT THE ESCAPING EXPLOSIVE GASES THROUGH SAID SPACE WILL TEND TO FORCE SAID SHANK AND HOOK APART; (N) SAID KEEPER BOLT HOLES BEING COUNTER-SUNK SO THAT, AS SAID BOLT RUPTURES ALONG SAID BREAK LINE BETWEEN SHANK AND HOOK, IT WILL BE SWAGED INTO SAID COUNTERSINKS TO PROVIDE A FIRM BACKING FOR SAID EXPLOSIVE GASES.