Patent ID: 9625241
Date: 2017-04-18
CPC Classifications: F42B,Y10T

Claim:
1. A cartridge casing for firearm ammunition, which casing comprises an elongate interior cavity for receiving a propellant and a projectile and extends along a longitudinal axis between a top end and a bottom end, wherein the cavity is open at the top end of the casing and is confined radially by a circumferentially extending sidewall formed by an elongate tubular portion defining the longitudinal axis of the casing and having a first axial end forming the top end of the casing and an opposite second axial end, and at the bottom by a bottom wall having a bottom surface and a top surface, which bottom wall is connected to the second axial end of the tubular portion and comprises a bore extending between the bottom surface and the top surface of the bottom wall and being arranged for receiving an igniting medium, wherein the casing further comprises in a lateral outer surface an annular projection located proximate the bottom end of the casing and extending circumferentially in a plane perpendicular to the longitudinal axis of the casing, wherein the casing comprises an elongate tubular sleeve component open at both axial ends and a separate bottom component fixedly secured to the sleeve component, wherein the tubular portion of the casing is formed by the sleeve component, so that the sidewall is constituted in its entirety by the sleeve component, wherein, along the entire length of the interior cavity from the top end to the bottom end thereof, in cross-section perpendicular to the longitudinal axis a circumferential outermost surface of the casing is a surface of the sidewall, the bottom wall of the casing is formed at least in part by the sleeve component and at least in part by the bottom component, and the bottom component comprises a lower axial end surface, an opposite upper axial end surface and a circumferentially extending lateral outer surface on which the annular projection is arranged and is constructed for receiving an igniting medium, and the sleeve component is fixedly secured at one of its two axial ends to the upper axial end surface of the bottom component, wherein at the axial end of the sleeve component at which the sleeve component is fixedly secured to the bottom component the sleeve component comprises a radially inwardly projecting flange having an annular end face facing and abutting the upper end surface of the bottom component, and wherein each of the sleeve component and the bottom component are integrally constructed in one piece.