Trigger to activate aqueous salt solution for use in a heat pack and method of making the same

Claim 1

A trigger to initiate crystallization of an aqueous salt solution, said trigger being in contact with said solution and said solution and trigger being confined within flexible container forming a heat pack wherein during crystallization the crystallization solution gives off heat from the exothermic reaction and the heat pack may be used for applying heat to the body where desired, said trigger comprising: a thin wafer of metalic material having an external perimeter, said wafer including at least one activator cut extending through the thickness of said wafer and positioned inwardly of said exterior perimeter; said activator cut including a first elongated slit formed by two opposed facing edges that are minutely spaced one from the other, said first slit including opposed terminus points, at least one minor slit at one or the other of said terminus points, and including at least one minor slit at one or the other of said terminus points angularly disposed thereto, wherein said minor slit is formed by two opposed facing edges that are minutely spaced one from the other, said minor slit communicating with said first elongated slit and said minor slit ending in a minor terminus activator point in said wafer: and said wafer having two positions between which it is bendable by finger pressure with snap displacement causing the minor terminus activator point to minutely initiate crystallization of said aqueous salt solution.