Pressure releasing means

Claim 1

GAS RELEASE MEANS FOR USE WITH A GAS PRESSURE SOURCE HAVING A BURSTING DISC, COMPRISING THE COMBINATION OF: A PIERCING PIN HAVING MEANS TO PIERCE SAID DISC AND MEANS TO PERMIT FLOW OF GAS FROM SAID SOURCE WHEN THE DISC IS PIERCED; A COMPRESSION SPRING COAXIAL WITH SAID PIN AND URGING SAID PIN AWAY FROM A COCKED POSITION AND TOWARD THE DISC; A BODY HOUSING THE SPRING AND PIN, AND HAVING SPACED UPSTANDING ARMS; A U-SHAPED LEVER PIVOTABLY CONNECTED BY ITS OPEN END TO THE SPACED ARMS AND PIVOTABLY MOVABLE BETWEEN SAID SPACED ARMS, SAID LEVER HAVING ITS CLOSED END REMOTE FROM SAID PIN AND DISC; A LINK MEMBER DISPOSED BETWEEN THE LEGS OF SAID LEVER, SAID LINK MEMBER HAVING ONE END PIVOTALY CONNECTED TO THE PIERCING PIN AND THE OTHER END PIVOTALY CONNECTED TO THE LEVER ADJACENT THE CLOSED END OF SAID LEVER, AN IMAGINARY LINE CONNECTING THE ENDS OF THE LINK MEMBER PASSING CLOSE TO THE LEVER PIVOTS TO PROVIDE A SMALL OFFSET WHEN THE PIN IS IN THE COCKED POSITION; EXPANSIBLE MEANS TO CONTROL THE MOVEMENT OF SAID PIN; AND A CATCH ARM HAVING ONE END PIVOTALLY CONNECTED TO THE SPACED UPSTANDING ARMS AND THE OTHER END PIVOTABLY CONNECTED TO THE EXPANSIBLE MEANS, THE SAID CATCH ARM DEFINING A CUTAWAY PORTION, FOR ENGAGEMENT WITH THE CLOSED END OF THE LEVER, SUBSTANTIALLY MIDWAY BETWEEN THE ENDS OF THE CATCH ARM, THE LEVER BEING SUBSTANTIALLY AT RIGHT ANGLES TO AND ENGAGED BY THE CATCH ARM AT THE CUTAWAY PORTION WHEN THE PIN IS IN ITS COCKED POSITION; MOVEMENT OF THE EXPANSIBLE MEANS BY A PREDETERMINED AMOUNT CAUSING THE CATCH ARM TO RELEASE THE LEVER FROM THE CUTAWAY PORTION, THEREBY ALLOWING THE LEVER TO ROTATE ABOUT ITS OPEN END AND INCREASE THE AMOUNT OF SAID OFFSET, AND FURTHER ALLOWING THE PIN TO PIERCE THE DISC BY THE URGING OF SAID SPRING.