Cartridge case and cartridge arrangement and method

A cartridge case comprising

• a base,
• a sleeve connected to said base through a mechanical interlocking overlapping joint having radially innermost and outermost overlapping portions which have interengaging mechanical interlock surfaces, which joint forms an obturating seal under radially outward pressure exerted thereon,
• and a plurality of circumferentially spaced radially extending vent holes formed in the radially innermost of the overlapping portions of said joint to enable partial pressure equalization and longitudinal pressure-responsive interlock relief relative movement along a longitudinal portion of said joint while enabling obturating circumferential sealing of the remaining portion of said joint,
• said mechanical interlocking overlapping joint comprising overlapping interfacing chevron surfaces formed on each of said base and said sleeve,
• said sleeve being disposed radially inboard of said base in the zone of said joint and having its said chevron surface facing radially outwardly and having said vent holes formed therein,
• said vent holes being formed in the zone of and extending through the outwardly facing innermost one of said chevron surfaces.

A cartridge case comprising

• a base,
• a sleeve connected to said base through a mechanical interlocking overlapping joint having radially innermost and outermost overlapping portions, which have interengaging mechanical interlock surfaces, which joint forms an obturating seal under radially outward pressure exerted thereon,
• and a plurality of circumferentially spaced radially extending vent holes formed in the radially innermost of the overlapping portions of said joint and within the zone of said mechanical interlock surfaces to enable partial pressure equalization over a longitudinal portion only of said joint while enabling obturating circumferential sealing of the remaining portion of said joint,
• said mechanical interlocking overlapping joint comprising overlapping interfacing annular chevron surfaces formed on each of said base and said sleeve,
• said sleeve being disposed radially inboard of said base in the zone of said joint and having its said chevron surface facing radially outwardly and having said vent holes formed therein.

A cartridge case comprising

• a base,
• a sleeve connected to said base through a mechanical interlocking overlapping joint having gradually innermost and outermost overlapping portions which have interengaging mechanical interlock surfaces, which joint forms an obturating seal under radially outward pressure exerted thereon,
• and a plurality of circumferentially spaced radially extending vent holes formed in the radially innermost of the overlapping portions of said joint and within the zone of said mechanical interlock surfaces to enable partial pressure equalization and longitudinal pressure-responsive interlock relief over a longitudinal portion of said joint while enabling obturating circumferential sealing of the remaining portion of said joint,
• said mechanical interlocking overlapping joint comprising overlapping interfacing annular chevron surfaces formed on each of said base and said sleeve.
• and said vent holes being formed in the zone of and extending through the outwardly facing innermost one of said chevron surfaces.