ONE-PIECE CAST CARTRIDGE CASE "LENA" Russian patent published in 1998 - IPC

FIELD: hinting, applicable for smoothbore gun fire. SUBSTANCE: cartridge case is cast as one piece and the case bottom part is reinforced by a bottom plate of stronger metal, for instance, in the form a washer. whose inner hole has center bosses, and the diameter of the circumference with the boss tips equals the diameter of the primer seat, and the washer, thickness makes up part of the cartridge case bottom height for instance, 1/2 of the height; the tips of the center bosses come out to the primer seat surface; the cartridge case bottom part is reinforced by a set of two or more adjoining tandem washers. EFFECT: enhanced reliability of primer seat sealing, multiple use of cartridge case. 3 cl, 8 dwg