Contoured spool for supporting sheet explosive

Claim 1

AN EXPLOSIVE PACKAGE COMPRISING A CONTOURED SPOOL COMPRISING A CYLINDER WHOSE LATERAL SURFACE IS INSCRIBED WITH THAT SURFACE GENERATED BY AN ISOSCLES TRIANGLE HAVING ITS ALTITUDE DEFORMED TO FORM A SPIRAL, THE APEX OF THE TRAINGLE BEING AT ESSENTIALLY THE CENTER OF SAID SPIRAL, AND THE EDGES OF THE DEFORMED TRAINGLE DEFINING, ON EACH SIDE OF A PLANE PERPENDICULAR TO AND BISECTING THE ALTITUDE OF SAID CYLINDER, A CONICAL HELICAL SURFACE AND A HELICAL CHANNEL OF GRADUALLY INCREASING WIDTH AND PITCH, A FLEXIBLE SELF-SUPPORTING TAPE OF AN EXPLOSIVE COMPOSITION COMPRISING FROM ABOUT 15 TO ABOUT 92.5% BY WEIGHT OF CAPSENSITIVE EXPLOSIVE IN ADMIXTURE WITH AN ELASTOMERIC BINDING AGENT ROLLED ABOUT SAID CONTOURED SPOOL, SAID TAPE BEING FOLDED ABOUT A HINGE, SAID HINGE FORMED BY THE PROVISION OF TWO SETS OF SLITS ESSENTIALLY EQUAL IN LENGTH EXTENDING THROUGH SAID EXPLOSIVE COMPOSITION, SAID SLITS OF EACH SET BEING ARRANGED IN ECHELON BETWEEN THE SIDES OF THE TAPE AT AN ANGLE OF 0* TO 60* WITH ONE OF TWO FOLD LINES ON WHICH SAID TAPE IS TO BE FOLDED, THE SAID FOLD LINES DEFINING ON SAID TAPE AN AREA HAVING THE GENERAL CONFIGURATION OF AN ISOCLELES TRIANGLE, AND TORSION BARS BEING DEFINED ALONG SAID FOLD LINES BY THE SECTION OF TAPE LYING BETWEEN SAID SLITS, THE WIDTH OF THE TORSION BAR BEING ESSENTIALLY EQUAL TO THE THICKNESS OF THE TAPE, SAID HINGE BEING POSITIONED IN THE CONICAL HELICAL CHANNEL.