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Polymer ammunition cartridge having a wicking texturing

  • US 9,631,907 B2
  • Filed: 06/26/2015
  • Issued: 04/25/2017
  • Est. Priority Date: 11/10/2010
  • Status: Active Grant
First Claim
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1. A polymeric ammunition cartridge having wicking texturing comprising:

  • a substantially cylindrical primer insert comprisinga top surface opposite a bottom surface and a substantially cylindrical coupling element that extends from the bottom surface, wherein the substantially cylindrical coupling element forms an outer surface opposite an inner circumferential surface,a primer recess in the top surface that extends toward the bottom surface,a primer flash aperture positioned in the primer recess to extend through the bottom surface,a flash hole groove that extends circumferentially about the primer flash aperture in the primer recess, anda locking groove that extends circumferentially about the top surface;

    a substantially cylindrical polymeric middle body comprising a first polymer that extends from a cylindrical middle body coupling region to the substantially cylindrical primer insert, wherein the first polymer is over-molded over the substantially cylindrical coupling element to the locking groove and into the primer flash aperture to the flash hole groove;

    a textured middle body surface on the cylindrical middle body coupling region;

    a substantially cylindrical polymeric projectile end mated to the substantially cylindrical polymeric middle body molded from a second polymer, wherein the substantially cylindrical polymeric projectile end comprises a projectile end coupling region that extends to a shoulder region that reduces to a neck region having a projectile aperture wherein the projectile end coupling region couples to the textured middle body surface;

    a propellant chamber defined between the primer flash aperture and the projectile aperture; and

    a textured projectile aperture surface about an inner surface of the projectile aperture, wherein the textured projectile aperture surface couples the projectile to the projectile aperture.

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