Patent ID: 7819065
Filing Date: 2010-10-26
Classification: F42B

Abstract:
1. Practice cartridge round, comprising projectile including a projectile body and a projectile tip, and a cartridge shell into which the projectile is inserted, and that possesses a propulsion chamber, a pyrotechnic propulsive charge, and a pyrotechnic igniter for the propulsive charge, whereby the round may be used in a long-barrel weapon, and whereby the projectile is propelled out of the cartridge shell upon ignition of the propulsive charge by means of pressure buildup within the propulsion chamber, the improvement comprising (a) a one-piece cylindrical central body; (b) a one-piece basin-shaped projectile tip having a spring-elastic collar with a first engagement element surrounding its outer edge and facing inward so that, when the projectile tip is pressed onto the central body, the first engagement element engages a circumferential engagement bead with a first circumferential engagement slot located in the central body; and (c) a cartridge shell formed as a one-piece basin-shaped part whose open end transforms into a collar that includes a second surrounding engagement element at its open end that engages with a second circumferential engagement slot of the central body, said cartridge shell having a base and an approximately cylindrical projection directed inward from the base, in which a receiver recess is provided for the propulsive charge and for an igniter device, wherein the collar of the cartridge shell tapers smoothly inward along a direction from the second engagement slot of the central body toward the base of the cartridge shell, and wherein, in the area of this engagement slot, outer diameter of the collar is less than, and remains within the outer diameter of the central body, whereby the cartridge shell includes an exhaust aperture that ends beneath the base of the central body and whereby, during ignition and firing, gases forced into the space between the central body and collar cause the collar to expand and fully seat against an inner wall of a surrounding barrel of the weapon.