Abstract: A deconfinement device for the casing of a piece of ammunition enclosing an explosive load able to be ignited by a priming fuse, said device comprising a connecting ring linked to the casing and enabling the priming fuse to be joined to said casing, wherein said device incorporates a structure to ensure a weakened and shearable link between said fuse and said connecting ring, said link being sheared further to an increase in the pressure inside said casing, said connecting ring incorporating a base forming a plate that can be projected onto said explosive load during the ignition of said fuse, said base being able to be fractured by the presence of pressure inside said body of said projectile.

Abstract: The invention relates to an impact fuse comprising a body containing a piezoelectric generator put in place on a bracket integral with the body and forming an anvil, said fuse comprising a piston intended to come to exert a mechanical stress on the generator, said piston receiving the impact strain transmitted by a cap, said fuse being wherein the piston is slidably fitted relatively to the body and in that it comprises plastically deformable means that are interposed between the cap and the body, said means being deformed by the cap movement on impact on a target, said movement causing a piston movement, the energy consumed by the means deformation thus allowing to ensure a longer and more gradual crushing of the piezoelectric generator on impact on a target.