| 摘要 |
PCT No. PCT/GB86/00506 Sec. 371 Date Apr. 21, 1987 Sec. 102(e) Date Apr. 21, 1987 PCT Filed Aug. 26, 1986 PCT Pub. No. WO87/01275 PCT Pub. Date Mar. 12, 1987.A trigger device for a heat pack comprises three helically-coiled, resilient metallic filaments (1,2,3) nested one within the other and of inwardly decreasing diameter, the filament (2) being wound in a sense opposite to that of filaments (1) and (3). Flexing the assembly of nested helices about its longitudinal axes produces a rubbing action action between adjacent turns thereof which initiates crystallization. Other devices comprises two nested helices wound in the same sense; a single helix having a pressure plate at one end and an external or internal cap at the other; and a body of randomly convoluted or woven metallic filament.
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