Pressure responsive initiator

Claim 1

A HYDROSTATIC PRESSURE-RESPONSIVE INITIATOR COMPRISING A TUBULAR SHELL OPEN AT BOTH ENDS AND HAVING AN AXIALLY PROJECTING BASE AT ONE EXTREMITY THEREOF, A PISTON SLIDABLY MOUNTED WITHIN AND CLOSING THE END OPPOSITE THE BASE OF SAID SHELL, SAID PISTON HAVING A CIRCUMFERENTIAL FLANGE AT ITS EXPOSED EXTREMITY, A FLEXIBLE, RESILIENT STRIKER ARM FIXED TO THE INNER END OF THE PISTON AND CURVED SO THAT ITS FREE END EXTENDS TOWARD THE SIDE WALL OF SAID SHELL, A COLLAR THREADABLY MOUNTED ON SAID BASE FOR MOVEMENT TOWARD EITHER EXTREMITY OF THE SAID SHELL, A SPRING MEANS MOUNTED ON THE SHELL AND ABUTTING BOTH THE SAID COLLAR AND THE SAID PISTON FLANGE, AN EXPLOSIVE CHARGECONTAINING UNIT SECURED WITHIN SAID BASE AND CLOSING THE OPEN EXTREMITY OF THE SHELL, A PERCUSSION SENSITIVE IGNITION COMPOSITION MOUNTED ON THE CONTAINED INNER EXTREMITY OF THE SAID EXPLOSIVE UNIT IN STRIKING RELATIONSHIP TO SAID STRIKER ARM AND A STRIKER ARM ARRESTER EXTENDING FROM THE SIDE WALL OF THE SHELL AND BETWEEN THE FREE END OF THE STRIKER ARM AND SAID IGNITION COMPOSITION, THE ALIGNMENT OF SAID FREE END, THE STRIKER ARM ARRESTER, AND THE IGNITION COMPOSITION BEING SUCH THAT UPON GRADUAL DEPRESSION OF SAID PISTON, THE STRIKER ARM FIRST ENGAGES AND IS COMPRESSED BY THE STRIKER ARM ARRESTER AND THEN SLIPS OFF SAID ARRESTER AND SNAPS ONTO SAID IGNITION COMPOSITION.