Patent ID: 6966263
Filing Date: 2005-11-22
Classification: F42B

Abstract:
1. 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 wherein the orthogonal grooves cut through the cutting plate to divide the cutting plate into four separate sections and an attaching means to attach the four separate sections together along the cut to reform the cutting plate; 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.