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Cartridge for small arms

  • US 5,094,169 A
  • Filed: 01/31/1991
  • Issued: 03/10/1992
  • Est. Priority Date: 10/10/1989
  • Status: Expired due to Fees
First Claim
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1. An improved cartridge case, the case including a base, an outer beveled section, a cylindrical section having a cylindrical sidewall, an inner cartridge case area and an open circular mouth, said base including a rear face and a circumferential extractor groove, said outer beveled section having a first, greater diameter adjacent said extractor groove, said outer beveled section extending to said cylindrical section at a second, lesser diameter, said cylindrical section extending between said outer beveled section and said open circular mouth, said open circular mouth having an outer diameter that is about 11.58 mm, the cylindrical section of the case is of a constant diameter of about 11.58 mm and is parallel the longitudinal axis of the case up to the start of the outer bevel, said case including a powder chamber having a planar base wall formed parallel to and spaced from said rear face and having an inner taper formed circumferential around said planar base wall, said inner taper extending outwardly to an internal surface of said cylindrical side wall at an interval circumference between said lesser diameter of said outer beveled section and said greater diameter of said outer beveled section, the outer beveled section is beveled 2.1 degrees upward above the horizontal plane to the widest diameter of the bevel which is within the range on the order of about 11.91 mm-11.94 mm, the extractor groove lies between the outer widest bevel diameter and the base, the base diameter is within the range on the order of about 11.91 mm-11.94 mm which has the same diameter as the widest part of outer bevel, the inner cartridge case area is cylindrically symmetric with the straight portion of the cylindrical section so that the cylindrical sidewall forms a straight wall parallel to the longitudinal axis of the cartridge case and about 13.97 mm in length, the inner diameter decreases from this straight section which tapers inward to about 8.46 mm in diameter at the planar base wall, the case length is within the range on the order of about 24.64 mm-24.90 mm in length so that the cartridge, a 0.44 A.P.C. cartridge, would never accidently chamber into a 0.45 A.P.C. barrel chamber.

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