Polymer ammunition having a primer insert with a primer pocket groove

Patent metadata

Field	Value
Publication number	US-10458762-B2
Application number	US-201815937038-A
Country	US
Kind code	B2
Filing date	Mar 27, 2018
Priority date	Nov 10, 2010
Publication date	Oct 29, 2019
Grant date	Oct 29, 2019

Abstract

The present invention provides an polymer 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 the groove is adapted to receive polymer at least partially over the bottom surface.

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 recess bottom, 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 the groove is adapted to receive the polymer overmolding at least partially over the bottom surface;
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 substantially cylindrical 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 bullet;
a propellant at least partially filling the propellant chamber;
a primer inserted into the primer recess; and
a projectile frictionally fitted in the bullet-end aperture.

2. 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.

3. 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.

4. The polymeric ammunition of claim 1 , wherein the groove extends about half the distance from the primer flash aperture to the circular recess side wall.

5. The polymeric ammunition of claim 1 , wherein the groove extends about one third the distance from the primer flash aperture to the circular recess side wall.

6. The polymeric ammunition of claim 1 , wherein the groove extends about two third the distance from the primer flash aperture to the circular recess side wall.

7. The polymeric ammunition of claim 1 , wherein the groove extends to about the circular recess side wall.

8. The primer insert of claim 1 , wherein the primer insert comprises a groove texture.

9. 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.

10. 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.

11. 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.

12. The polymeric ammunition of claim 1 , wherein the substantially cylindrical polymeric middle body, the polymeric bullet-end upper portion or both independently 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.

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

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

15. 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.

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

17. The polymeric ammunition of claim 1 , wherein the primer insert comprises the same material or different materials.

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

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

20. 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 Ti6A14V.

Assignees

• True Velocity Ip Holdings Llc

Inventors

• Burrow Lonnie

Classifications

• F42C19/0823

  Primers or igniters for the initiation or the propellant charge in a cartridged ammunition (primers for caseless ammunition F42C19/085) · CPC title

• B22F5/06

  of threaded articles, e.g. nuts · 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

• 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