Patent ID: 6408764
Filing Date: 2002-06-25
Classification: F42B

Abstract:
A case base for large-caliber ammunition having a case jacket comprising a combustible material, wherein:the case base comprises a metallic base plate and a support ring that projects axially beyond the base plate at an edge of the base plate, and an obturation ring that is disposed on a projectile side of the support ring, is formed of an elastomer or a thermoplastic, and has a lower end extending into and facing an inner surface of the support ring; the base plate and the support ring are embodied as a unitary structure; the height H1 of the support ring projecting beyond the base plate has the following relationship: 01<2D, where D represents the wall thickness of the base plate; and, on its inner surface facing the obturation ring, the support ring has a groove-shaped undercut into which the end of the obturation ring facing the support ring extends, with at least one of a form-fit and a positive lockup.