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Polymer cartridge having a primer insert with a primer pocket groove

  • US 10,274,293 B2
  • Filed: 03/27/2018
  • Issued: 04/30/2019
  • Est. Priority Date: 11/10/2010
  • Status: Active Grant
First Claim
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1. A polymeric ammunition cartridge comprising:

  • a primer insert comprising;

    a top surface opposite a bottom surface and a extraction flange that extends circumferentially about an outer edge of the top surface;

    a coupling element that extends from the bottom surface, wherein the coupling element is adapted to receive a polymer overmolding;

    a primer recess in the top surface that extends toward the bottom surface, wherein the primer recess comprises a recess bottom and a circular recess side wall;

    a primer flash aperture through the recess bottom that extends through the bottom surface, wherein the primer flash aperture is adapted to receive a polymer overmolding to form a flash hole; and

    a groove in the primer recess positioned around the primer flash aperture adapted to receive the polymer overmolding, wherein the groove extends at least partially over the recess bottom and at least partially over the circular recess side wall and the groove is adapted to receive the polymer overmolding;

    a substantially cylindrical polymeric middle body extending about the primer insert, wherein the substantially cylindrical polymeric middle body comprises;

    a polymeric bullet-end coupling element at a first end of the opposite a polymeric coupling end connected by a powder chamber, wherein the polymeric coupling end extends over the coupling element into the primer flash hole aperture to form a flash hole and into the groove; and

    a substantially cylindrical polymeric bullet-end upper portion comprising a bullet-end coupling element connected to the substantially cylindrical polymeric bullet-end coupling element opposite a projectile aperture adapted to engage a bullet.

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