Primer insert for a polymer ammunition cartridge casing

Patent metadata

Field	Value
Publication number	US-9927219-B2
Application number	US-201514724240-A
Country	US
Kind code	B2
Filing date	May 28, 2015
Priority date	Nov 10, 2010
Publication date	Mar 27, 2018
Grant date	Mar 27, 2018

Abstract

The present invention includes a metal primer insert for a polymeric ammunition cartridge having a top surface opposite a bottom surface and a substantially cylindrical coupling element that extends from the bottom 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, and a flange that extends circumferentially about an outer edge of the top surface, wherein the flange is adapted to receive a polymer overmolding that covers an circumferential surface and the primer flash aperture to form a primer flash hole.

First claim

What is claimed is:

1. A metal primer insert for a polymeric ammunition cartridge comprising:
a top surface opposite a bottom surface and a flange that extends circumferentially about an outer edge of the top surface;
a substantially cylindrical coupling element that extends from the bottom surface, wherein the substantially cylindrical coupling element is adapted to receive a polymer overmolding;
a primer recess in the top surface that extends toward the bottom surface;
a primer flash aperture in the primer recess 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 a polymer overmolding through the primer flash aperture.

2. The metal primer insert of claim 1 , wherein the substantially cylindrical coupling element comprises an inner surface adapted to receive a polymer overmolding and an outer surface adapted to receive a polymer overmolding.

Assignees

• True Velocity Inc

Inventors

• Burrow Lonnie

Classifications

• F42C19/083 Primary

  characterised by the shape and configuration of the base element embedded in the cartridge bottom, e.g. the housing for the squib or percussion cap · CPC title

• B22F5/06

  of threaded articles, e.g. nuts · CPC title

• B22F2998/10

  Processes characterised by the sequence of their steps · CPC title

• F42B5/313

  all elements made of plastics · CPC title

• F42C19/0807

  characterised by the particular configuration of the transmission channels from the priming energy source to the charge to be ignited, e.g. multiple channels, nozzles, diaphragms or filters · CPC title