Polymer ammunition having a primer insert with a primer pocket groove

Patent metadata

Field	Value
Publication number	US-10359262-B2
Application number	US-201815937075-A
Country	US
Kind code	B2
Filing date	Mar 27, 2018
Priority date	Nov 10, 2010
Publication date	Jul 23, 2019
Grant date	Jul 23, 2019

Abstract

The present invention provides an ammunition 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 a groove in the primer recess positioned around the primer flash aperture adapted to receive a polymer overmolding, wherein the groove extends at least partially over the bottom surface and at least partially over the circular recess side wall and the groove is adapted to receive polymer over the bottom surface and at least partially over the circular recess side wall.

First claim

What is claimed is:

1. A polymeric ammunition 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 the 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 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 opposite a polymeric coupling end connected by a propellant chamber, wherein the polymeric coupling end extends over the coupling element and into the primer flash hole aperture and into the groove to form a flash hole;
a polymeric bullet-end upper portion comprising a bullet-end coupling element connected to the polymeric bullet-end coupling element opposite a projectile aperture adapted to engage a projectile;

a propellant at least partially filling the propellant chamber;
a primer inserted into the primer recess; and
a bullet frictionally fitted in the bullet-end aperture.

2. The polymeric ammunition of claim 1 , wherein the groove extends up the circular recess side wall about 1-5 percent the distance from the recess bottom to the top surface.

3. The polymeric ammunition of claim 1 , wherein the groove extends up the circular recess side wall about 5-25 percent the distance from the recess bottom to the top surface or wherein the groove extends up the circular recess side wall about 25-50 percent the distance from the recess bottom to the top surface.

4. The polymeric ammunition of claim 1 , wherein the groove extends up the circular recess side wall about 50-75 percent the distance from the recess bottom to the top surface.

5. The polymeric ammunition of claim 1 , wherein the groove extends up the circular recess side wall about 75-95 percent the distance from the recess bottom to the top surface.

6. 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.

7. 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.

8. The polymeric ammunition of claim 1 , wherein the substantially cylindrical polymeric middle body is formed from a ductile polymer, a nylon polymer or a fiber-reinforced polymeric composite.

9. The polymeric ammunition of claim 1 , wherein the substantially cylindrical polymeric bullet-end upper portion comprises 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 cartridge 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 the same material or different materials.

17. The polymeric ammunition of claim 1 , wherein the primer insert comprises different polymers, different metals, different alloys, or different ceramic compositions.

18.

Assignees

• True Velocity Ip Holdings Llc

Inventors

• Burrow Lonnie

Classifications

• 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

• F42C19/083

  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

• F42B5/025

  characterised by the dimension of the case or the missile · CPC title

• C22C33/0257

  characterised by the range of the alloying elements · CPC title

• F42B33/001

  Devices or processes for assembling ammunition, cartridges or cartridge elements from parts · CPC title