Patent ID: 8800674

Claim:
An apparatus for releasing a fluid to the atmosphere, the apparatus comprising: a housing unit for the fluid, the housing unit having an outer surface for impacting at a surface and an inside surface located inwardly relative to the outer surface, the housing unit comprising an integral piston extending inwardly from the inside surface of the housing unit at a location adjacent to a position where the housing unit is adapted to impact at the outer surface, and such that the piston does not extend outwardly beyond the housing inner surface at that position; a mechanism for causing rupture of the housing unit whereby the fluid is released to the atmosphere from the housing unit, the mechanism comprising an explosive charge located within the housing unit, the explosive charge arranged to effect the rupturing of the housing unit when detonated; and a gas cavity located within the housing unit between the explosive charge and the piston; wherein the gas cavity encloses a gas that is able to be pressurized by an inwards movement of the piston caused by the housing unit impacting at the outer surface whereby, when the gas is pressurized by such inwards movement of the piston, it increases to a temperature sufficient to cause detonation of the explosive charge.