×

Polymer ammunition having a three-piece primer insert

  • US 10,101,140 B2
  • Filed: 03/15/2018
  • Issued: 10/16/2018
  • Est. Priority Date: 03/09/2016
  • Status: Active Grant
First Claim
Patent Images

1. A polymeric ammunition comprising:

  • a three piece primer insert comprising;

    an upper primer insert portion comprising an upper primer bottom surface, an upper primer aperture through the upper primer bottom surface, a groove positioned in the upper primer bottom surface around the upper primer aperture, wherein the groove is adapted to receive a polymer overmolding and a substantially cylindrical coupling element extending away from an upper primer top surface which is opposite the upper primer bottom surface;

    a middle primer insert portion comprising a middle aperture and an upper joint of the middle primer insert portion positioned in contact with the upper primer bottom surface and adjacent to the groove, wherein the middle aperture is smaller than the upper primer aperture; and

    a lower primer insert portion in contact with the middle primer insert portion comprising a lower primer bottom surface in contact with a lower joint of the middle primer insert portion and opposite a lower primer top surface, a primer recess in the lower primer top surface that extends toward the lower primer bottom surface and adapted to fit a primer, a lower aperture through the lower primer bottom surface, wherein the lower aperture is larger than the upper primer aperture;

    a substantially cylindrical polymeric middle body overmolding the three piece primer insert, wherein the substantially cylindrical polymeric middle body comprises;

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

    a propellant at least partially filling the powder chamber;

    a primer inserted into the primer recess; and

    a bullet frictionally fitted into the bullet-end aperture.

View all claims
  • 3 Assignments
Timeline View
Assignment View
    ×
    ×