9 millimeter cartridge casing with improved deep draw capability
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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Abstract
There is provided a single piece brass cartridge casing having improved deep drawing capability. The inner bore of the cartridge casing has a plurality of linear portions separated by at least two inflection points. A gradual change in the slope of the interior wall at each inflection point minimizes fracture at the inflection points during deep drawing.
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Citations
9 Claims
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1. An increased length 9 mm cartridge casing comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification