Shell for bullets of automatic or semiautomatic firearms with intertial closure

• US 6,862,993 B1
• Filed: 02/17/1998
• Issued: 03/08/2005
• Est. Priority Date: 02/24/1997
• Status: Expired due to Fees

• Current Assignee: Giuseppina Scarcella
• Original Assignee: Giuseppina Scarcella
• Inventors: Cudazzo, Antonio
• Primary Examiner(s): Carone, Michael J.
• Assistant Examiner(s): Bergin, James S.
• Application Number:
  US09/024,268
• Time in Patent Office: 2,576 Days
• Field of Search: 102/464, 102/469, 102/470, 102/430, 102465-468, 102/447, 29/13, 29/13.1, 42/25, 89194-196
• US Class Current: 102/464
• CPC Class Codes: F42B 5/26 Cartridge cases F42B5/18 takes precedence ; manufacturing of cartridge cases B21K21/04

Abstract

A shell for bullets of automatic or semiautomatic firearms with inertial closure, comprising a hollow cylindrical body which is closed, at one of its axial ends, by a head and is adapted to accommodate a bullet at the opposite axial end, the head being centrally provided with a cap that accommodates the primer. At least the portion of the shell which is extracted from the firing chamber when the fired bullet leaves the barrel is provided with reinforcement means to prevent accidental bursting of the shell at the end of the firing action and when the extraction of the shell from the firing chamber begins.

Claims

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;

said solid outwardly essentially cylindrical explosion pressure absorbing body portion having a first longitudinal extent corresponding to said channel length and said flange shaped head portion having a second longitudinal extent extending from said channel rear end up to said rear end surface of said shell, said first longitudinal extent being substantially greater than said second longitudinal extent, the sum of said first and second longitudinal extents measured from said planar formation up to said rear end surface of the shell defining a safety length of the shell, said safety length of the shell being substantially equal to said initially protruding length of the shell.

2. 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 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, the ratio between said channel diameter and said cavity diameter amounting to about 0.25;

said solid outwardly essentially cylindrical explosion pressure absorbing body portion having a first longitudinal extent equal to said channel length and said flange shaped head portion having a second longitudinal extent extending from said channel rear end up to said rear end surface of said shell, said first longitudinal extent being substantially greater than said second longitudinal extent, the ratio between said first and second longitudinal extents amounting to about 1.75;

the sun of said first and second longitudinal extents measured from said planar formation up to said rear end surface of the shell defining a safety length of the shell, said safety length of the shell being substantially equal to said initially protruding length of the shell.