Polymer Ammunition Having a Primer Insert With a Primer Pocket Groove

Patent metadata

Field	Value
Publication number	US-2018245898-A1
Application number	US-201815937140-A
Country	US
Kind code	A1
Filing date	Mar 27, 2018
Priority date	Nov 10, 2010
Publication date	Aug 30, 2018
Grant date	—

Abstract

The present invention provides polymer ammunition having a primer insert having a primer insert having 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.

First claim

What is claimed is:

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 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; a substantially cylindrical polymeric middle body extending about 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 covers an circumferential surface of the 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 in the bullet-end apertur

2 . The polymeric ammunition of claim 1 , wherein the one or more pads comprise 3 pads.

3 . The polymeric ammunition of claim 1 , wherein the one or more pads comprise 2-6 pads.

4 . The polymeric ammunition of claim 1 , wherein the one or more pads are positioned to align with an anvil of the primer.

5 . The polymeric ammunition of claim 1 , wherein the one or more pads are shaped to support an anvil of the primer.

6 . The polymeric ammunition of claim 1 , wherein the middle body connection end is a male coupling element with a straight skirt interlock surface that tapers to a smaller diameter at the forward portion on the skirt tip to mate with a female coupling element of the substantially cylindrical polymeric bullet-end.

7 . The polymeric ammunition of claim 1 , further comprising a diffuser positioned in the primer recess in contact with the primer and comprising a diffuser flash hole aligned with the primer flash hole.

8 . The polymeric ammunition of claim 1 wherein the polymeric ammunition cartridge 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.

9 . The polymeric ammunition of claim 1 , wherein the substantially cylindrical polymeric bullet-end upper portion and the substantially cylindrical polymeric middle body independently comprise a ductile polymer, a nylon polymer or a fiber-reinforced polymeric composite.

10 . The polymeric ammunition of claim 1 , wherein the substantially cylindrical polymeric middle body comprise a polymers selected from the group consisting of polyurethane prepolymer, cellulose, fluoro-polymer, ethylene inter-polymer alloy elastomer, ethylene vinyl acetate, nylon, polyether imide, polyester elastomer, polyester sulfone, polyphenyl amide, polypropylene, polyvinylidene fluoride or thermoset polyurea elastomer, acrylics, homopolymers, acetates, copolymers, acrylonitrile-butadinen-styrene, thermoplastic fluoro polymers, inomers, polyamides, polyamide-imides, polyacrylates, polyatherketones, polyaryl-sulfones, polybenzimidazoles, polycarbonates, polybutylene, terephthalates, polyether imides, polyether sulfones, thermoplastic polyimides, thermoplastic polyurethanes, polyphenylene sulfides, polyethylene, polypropylene, polysulfones, polyvinylchlorides, styrene acrylonitriles, polystyrenes, polyphenylene, ether blends, styrene maleic anhydrides, polycarbonates, allyls, aminos, cyanates, epoxies, phenolics, unsaturated polyesters, bismaleimides, polyurethanes, silicones, vinylesters, urethane hybrids, polyphenylsulfones, copolymers of polyphenylsulfones with polyethersulfones or polysulfones, copolymers of poly-phenylsulfones with siloxanes, blends of polyphenylsulfones with polysiloxanes, poly(etherimide-siloxane) copolymers, blends of polyetherimides and polysiloxanes, and blends of polyetherimides and poly(etherimide-siloxane) copolymers.

11 . The polymeric ammunition of claim 1 , wherein the substantially cylindrical polymeric bullet-end upper portion comprise a polymers selected from the group consisting of polyurethane prepolymer, cellulose, fluoro-polymer, ethylene inter-polymer alloy elastomer, ethylene vinyl acetate, nylon, polyether imide, polyester elastomer, polyester sulfone, polyphenyl amide, polypropylene, polyvinylidene fluoride or thermoset polyurea elastomer, acrylics, homopolymers, acetates, copolymers, acrylonitrile-butadinen-styrene, thermoplastic fluoro polymers, inomers, polyamides, polyamide-imides, polyacrylates, polyatherketones, polyaryl-sulfones, polybenzimidazoles, polycarbonates, polybutylene, terephthalates, polyether imides, polyether sulfones, thermoplastic polyimides, thermoplastic polyurethanes, polyphenylene sulfides, polyethylene, polypropylene, polysulfones, polyvinylchlorides, styrene acrylonitriles, polystyrenes, polyphenylene, ether blends, styrene maleic anhydrides, polycarbonates, allyls, aminos, cyanates, epoxies, phenolics, unsaturated polyesters, bismaleimides, polyurethanes, silicones, vinylesters, urethane hybrids, polyphenylsulfones, copolymers of polyphenylsulfones with polyethersulfones or polysulfones, copolymers of poly-phenylsulfones with siloxanes, blends of polyphenylsulfones with polysiloxanes, poly(etherimide-siloxane) copolymers, blends of polyetherimides and polysiloxanes, and blends of polyetherimides and poly(etherimide-siloxane) copolymers.

12 . The polymeric ammunition of claim 1 , wherein the substantially cylindrical polymeric bullet-end and the substantially cylindrical polymeric bullet-end upper portion are welded or bonded together.

13 . The polymeric ammunition of claim 1 , wherein the projectile aperture further comprises a mechanical interlock adapted to mate to a groove on a bullet.

14 . The polymeric ammunition of claim 1 , wherein the substantially cylindrical polymeric bullet-end coupling element is welded or bonded to the substantially cylindrical polymeric bullet-end upper portion.

15 . The polymeric ammunition of claim 1 , wherein the primer insert comprises a polymer, a metal, an alloy, or a ceramic alloy.

16 . The polymeric ammunition of claim 1 , wherein the primer insert comprises steel, nickel, chromium, copper, carbon, iron, stainless steel or brass.

17 . The polymeric ammunition of claim 1 , wherein the primer insert comprises 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 or Ti6Al4V.

Assignees

• True Velocity Inc

Inventors

• Burrow Lonnie

Classifications

• F42B33/02

  Filling cartridges, missiles, or fuzes; Inserting propellant or explosive charges {(F42B33/004 takes precedence)} · CPC title

• F42B5/313

  all elements made of plastics · CPC title

• B22F3/004

  Filling molds with powder (feeding material to presses in general B30B15/302) · CPC title

• C22C33/0257

  characterised by the range of the alloying elements · CPC title

• F42B33/00 Primary

  Manufacture of ammunition; Dismantling of ammunition; Apparatus therefor (F42B5/188 takes precedence; manufacturing processes for hollow charges F42B1/036; manufacture of blasting cartridge initiators F42B3/195) · CPC title