Patent ID: 6817297
Filing Date: 2004-11-16
Classification: F42B

Abstract:
A device for creating an opening in a target material, having a first hardness, comprising:a cutting plate, having a second hardness being greater than the first hardness, with orthogonal grooves on a front side; a sheet of material, having a third harness being less than the second hardness and having a surface area less than a surface area of the cutting plate and having a first and a second sides wherein the first side comprises a position against the front side of the cutting plate, placed upon the front side of the cutting plate with the orthogonal grooves; an explosive charge placed upon the sheet of material, positioned substantially along the orthogonal grooves, only on the second side of the sheet of material; initiating means, located proximately central to the explosive charge, to initiate the explosive charge, creating an explosive force that creates a plurality of petals cantilevered from the cutting plate that drive into the target material, creating a plurality of petals cantilevered from the target material to define a fragment-free opening in the target material.