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9 millimeter cartridge casing with improved deep draw capability

  • US 5,507,232 A
  • Filed: 04/10/1995
  • Issued: 04/16/1996
  • Est. Priority Date: 04/10/1995
  • Status: Expired due to Term
First Claim
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1. An increased length 9 mm cartridge casing comprising:

  • a deep drawn single piece of brass having a first portion for receiving both gun powder and a bullet, a second portion for receiving a primer charge and a transition portion disposed between said first portion and said second portion;

    said first portion having an outside diameter that continuously decreases at a constant rate from a maximum adjacent to said transition portion to an opposing end of said first portion and an inner bore that contains, in cross section along a longitudinal axis, a first linear interior portion extending from said opposing end to a first inflection point, a second linear interior portion extending from said first inflection point to a second inflection point and forming an angle, β

    , with said first linear portion of from about 175°

    to about 179.5°

    , a third linear portion extending from said second inflection point to a third inflection point and forming an angle, Θ

    , with said second linear portion of from about 172°

    to about 179°

    , and a fourth arcuate portion extending from said third inflection point to a planar interior base that is generally perpendicular to a longitudinal axis of the cartridge, wherein the maximum thickness of said cartridge casing at said second inflection point is 0.032 inch;

    said second portion having an interior chamber to receive a primer charge; and

    said transition portion having an internal channel extending from said first portion to said second portion, said internal channel located rearward of said planar interior base.

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