Patent ID: 6862993
Filing Date: 2005-03-08
Classification: F42B

Abstract:
1. A shell for bullets exclusively for automatic or semiautomatic pistols with an inertial closure having an internally cylindrical barrel with a cylindrical firing chamber for the shell and a sliding breech, the pistols allowing that upon firing at the moment when the fired bullet leaves the barrel the shell moves backwards with the sliding breech thereby to initially outwardly expose a portion of the shell protruding initially outwardly form the chamber of the barrel thereby defining an initially protruding length of the shell, the shell having a substantially cylindrical shape corresponding to the cylindrical shape of said cylindrical firing chamber thereby to be located totally within the firing chamber prior to firing the shell comprising: a forward end and a rear end and a peripheral extraction groove near said rear end and being in the form of a one-piece body including a hollow outwardly cylindrical body portion defining an essentially cylindrical cavity for the firing charge and having forwardly an open end for accommodating a bullet therein closing said essentially cylindrical cavity and a bottom opposite to said open end, said essentially cylindrical cavity having a cavity diameter, a solid outwardly essentially cylindrical explosion pressure absorbing body portion integral with said shell and extending from said bottom of said hollow outwardly cylindrical body portion up to said peripheral extraction groove said solid outwardly essentially cylindrical explosion pressure absorbing body portion defining said bottom for said essentially cylindrical cavity, said bottom having centrally a planar formation, a flange shaped head portion including said peripheral extraction groove and extending rearwards from said solid outwardly essentially cylindrical explosion pressure absorbing body portion and defining at said rear end of the shell a rear end surface of said shell, said head portion having a pocket for a primer and said solid outwardly essentially cylindrical explosion pressure absorbing body portion having a channel extending centrally throughout said solid outwardly essentially cylindrical explosion pressure absorbing body portion from said pocket towards said essentially cylindrical cavity and opening into said essentially cylindrical cavity at said planar formation of said bottom, said channel having a channel forward end opening into said essentially cylindrical cavity, a channel rear end opening into said pocket, a channel length extending from said channel forward end up to said channel rear end, a channel diameter, said channel diameter being substantially smaller than said cavity diameter thereby to expose to explosion pressure a surface area determined by said channel diameter and said channel length;