Patent ID: 6178963
Filing Date: 2001-01-30
Classification: A61F,F28D,Y02E

Abstract:
A heat pack comprising:a flexible container;a solution in the container, said solution generating heat while crystalizing;a trigger disposed in the container in contact with the solution, for making the solution generate the heat,wherein the trigger is a single coil spring, said coil spring having a longitudinal axis and a series of interconnected coil windings laid down to one side so that the windings are partially contacted with each other, each of said windings being generally circular and laid down in a plane disposed at an acute angle to the longitudinal axis of the spring, the width of said coil spring along the length of the longitudinal axis being equal to the diameters of the circular windings, and thickness of the said coil spring along the length of the longitudinal axis being less than the diameters of the circular windings.