Abrégé

A cup and plug assembly of a base for a polymer based ammunition cartridge case body includes a cylindrical sleeve joined to the base. The base includes a plug molded over a cup. The cup includes a first annular cup portion extending in a first direction from a web formed therein and a second annular cup portion extending in a second direction from the web opposite to the first direction. The plug having a first annular portion that completely encompasses an outer circumferential surface of the cup and a second annular portion that extends from the first annular portion. The second annular portion of the plug completely covering an inner surface of the first annular cup portion of the cup. The cup preferably being formed from a metal or a suitable non-metal and the plug being formed from a suitable polymer that is injection molded over the cup.

Classes IPC  ?

• F42B 5/297 - Douilles en métal comportant un revêtement avec de la matière plastique
• F42B 5/30 - Douilles en matière plastique
• F42B 5/307 - Douilles en matière plastique constituées par l'assemblage d'au moins trois éléments
• F42B 5/313 - Douilles en matière plastique constituées par l'assemblage d'au moins trois éléments tous les éléments étant en matière plastique

Abrégé

A lead-free, composite polymer based bullet and cartridge case, wherein the cartridge case is formed by matingly engaging a cylindrical body and a corresponding base. A belted cartridge case has a double wall design, which provides the cartridge with increased thickness, and in turn, a reinforced structure useful for withstanding breakage from an impact caused by high pressure loads. The belt is formed to have an inner diameter at a first end of the base that is larger than the outer diameter of any portion of the cylindrical body. A nested cartridge case allows the second end of the case to nest in a first end of the base at an engaging region.

Classes IPC  ?

• F42B 5/30 - Douilles en matière plastique