Primer Insert Having a Primer Pocket Groove

Abstract

The present invention provides a primer insert for use in a polymeric ammunition cartridge includes atop 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 substantially cylindrical 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 one or more pads positioned on the recess bottom; a groove in the primer recess positioned around the primer flash aperture to extend at least partially over the recess bottom and adapted to receive a polymer overmolding.

What is claimed is: 
     
         1 . A primer insert for use in a polymeric ammunition cartridge 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 substantially cylindrical 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   one or more pads positioned on the recess bottom;   a groove in the primer recess positioned around the primer flash aperture to extend at least partially over the recess bottom and adapted to receive a polymer overmolding.   
     
     
         2 . The primer insert of  claim 1 , wherein the one or more pads comprise 3 pads. 
     
     
         3 . The primer insert of  claim 1 , wherein the one or more pads comprise 2-6 pads. 
     
     
         4 . The primer insert of  claim 1 , wherein the one or more pads are positioned to align with the primer. 
     
     
         5 . The primer insert of  claim 1 , wherein the one or more pads are positioned to align with an anvil of the primer. 
     
     
         6 . The primer insert of  claim 1 , wherein the one or more pads are shaped to support an anvil of the primer. 
     
     
         7 . The primer insert of  claim 1 , wherein the coupling element comprises an inner surface adapted to receive a polymer overmolding and an outer surface adapted to receive a polymer overmolding. 
     
     
         8 . The primer insert of  claim 1 , further comprising an outer molding groove that extends circumferentially about an outer edge of the top surface. 
     
     
         9 . The primer insert of  claim 1 , wherein the primer insert has a caliber selected from .223, .243, .25-06, .270, .300, .308, .338, .30-30, .30-06, .45-70 or .50-90, 50 caliber, 45 caliber, 380 caliber or 38 caliber, 5.56 mm, 6 mm, 7 mm, 7.62 mm, 8 mm, 9 mm, 10 mm, or 12.7 mm. 
     
     
         10 . The primer insert of  claim 1 , wherein the primer insert is a 5.56 mm, 7.62 mm, .223, 308, 338, 12.7mm, and 0.50 caliber primer insert. 
     
     
         11 . The primer insert of  claim 1 , wherein the primer insert comprises a metal, an alloy, a polymer or a ceramic alloy. 
     
     
         12 . The primer insert of  claim 1 , wherein the primer insert comprises steel, nickel, chromium, copper, carbon, iron, stainless steel or brass. 
     
     
         13 . The primer insert of  claim 1 , wherein the primer insert comprises a 102, 174, 201, 202, 300, 302, 303, 304, 308, 309, 316, 316L, 316Ti, 321, 405, 408, 409, 410, 415, 416, 416R, 420, 430, 439, 440, 446 or 601-665 grade stainless steel. 
     
     
         14 . The primer insert of  claim 1 , wherein the primer insert comprises a Ti 6 Al 4 V. 
     
     
         15 . The primer insert of  claim 1 , wherein the primer insert comprises a groove texture.