Cartridge case and cartridge arrangement and method
First Claim
1. 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 at least one radially extending vent hole 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 relative movement along a longitudinal portion of said joint while enabling obturating circumferential sealing of the remaining portion of said joint.
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0 Petitions
Accused Products
Abstract
A cartridge case and cartridge arrangement and method in which a base is joined along an annular intermating chevron-shaped joint with a sleeve. In the illustrated and preferred embodiment the base is metal and the sleeve is glass-fiber-reinforced plastic. The case has a propellant, projectile, and a percussive primer. A plurality of circumferentially spaced vent holes are formed in the plastic sleeve along a portion of the chevron joint as an aid to reducing excessive interface friction loads at the chevron joint during firing of the cartridge. A less preferred modification and mode of practice of the invention is disclosed in which the base is formed of plastic material or a composite glass-plastic or other composite plastic material, and the sleeve is formed of metal. A further less preferred modification and mode of practice is disclosed in which both the sleeve and the base are formed of similar materials.
66 Citations
40 Claims
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1. 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 at least one radially extending vent hole 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 relative movement along a longitudinal portion of said joint while enabling obturating circumferential sealing of the remaining portion of said joint.
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15. 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.
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18. 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.
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31. 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.
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38. The method of manufacture of a cartridge case having a metal base and a plastic sleeve in which excessive interface friction loads are reduced at a plastic/metal interface circumferential joint formed between a chevron-surface-interconnected metal cartridge base and an annular plastic cartridge sleeve having radially innermost and outermost overlapping mutually interfacing and interfitting longitudinally tapered chevron-surfaced annular lips, comprising
forming at least one radially extending vent hole in said radially innermost one of said chevron-surfaced annular lips and extending through the chevron surface thereof to thereby enable a gas-pressured partial separation and longitudinal friction reduction between the interfitting chevron surfaces of said annular lips to be effected as a function of pressurizing of the radial interior formed said said chevron-surface-interconnected metal cartridge base and plastic sleeve, to thereby reduce likelihood of cartridge breakage upon propellant ignition and propellant gas pressure build-up, and joining said base and sleeve together in pressure sealing longitudinally pressure-responsively relievable mechanically interlocked relation.
Specification