Polymer ammunition cartridge having a wicking texturing

Patent metadata

Field	Value
Publication number	US-2017138705-A9
Application number	US-201514751535-A
Country	US
Kind code	A9
Filing date	Jun 26, 2015
Priority date	Nov 10, 2010
Publication date	May 18, 2017
Grant date	—

Abstract

One embodiment of the present invention provides a polymeric ammunition cartridge having wicking texturing.

First claim

What is claimed is:

1 . A polymeric ammunition cartridge having wicking texturing comprising:
a substantially cylindrical primer insert comprising a top surface opposite a bottom surface and a substantially cylindrical coupling element that extends from the bottom surface, wherein the substantially cylindrical coupling element forms an outer surface opposite an inner circumferential 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 locking groove that extends circumferentially about the top surface; a substantially cylindrical polymeric middle body extending from the substantially cylindrical primer insert to a cylindrical middle body coupling region, wherein the first polymer is molded over the locking groove, the inner circumferential surface and the outer surface and extends to the cylindrical middle body coupling region; a textured middle body surface on the cylindrical middle body coupling region; a substantially cylindrical polymeric projectile end mated to the substantially cylindrical polymeric middle body molded from a second polymer, wherein the substantially cylindrical polymeric projectile end comprises a projectile end coupling region that extends to a shoulder region that reduces to a neck region having a projectile aperture wherein the projectile end coupling region couples to the textured surface; a propellant chamber defined between the primer flash aperture and the projectile aperture; and a textured projectile aperture surface about an inner surface of the projectile aperture, wherein the textured projectile aperture surface couples the projectile to the projectile aperture.

2 . The cartridge of claim 1 , wherein the textured middle body surface comprises etching, grooves, hatching, knurling, a texture, rings, or a combination thereof.

3 . The cartridge of claim 1 , wherein the textured projectile aperture surface comprises etching, grooves, hatching, knurling, a texture, rings, or a combination thereof.

4 . The cartridge of claim 1 , further comprising a primer flash aperture groove positioned in the primer recess around the primer flash aperture and the first polymer composition extends into the primer flash aperture to form a flash hole.

5 . The cartridge of claim 1 , wherein the first polymer composition is a ductile polymer.

6 . The cartridge of claim 1 , wherein the first polymer composition, the second polymer composition or both comprise a nylon polymer.

7 . The cartridge of claim 1 , wherein the first polymer composition, the second polymer composition or both comprise a fiber-reinforced polymeric composite.

8 . The cartridge of claim 1 , wherein the first polymer composition, the second polymer composition or both comprise between about 10 and about 70 wt % glass fiber fillers, mineral fillers, or mixtures thereof.

9 . The cartridge of claim 1 , wherein the substantially cylindrical coupling region and the polymeric bullet-end coupling are welded or bonded together.

10 . The cartridge of claim 1 , wherein the first polymer composition, the second polymer composition or both comprise 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 cartridge of claim 1 , further comprising one or more internal structures in the neck to support a bullet.

13 . The cartridge of claim 1 , wherein the bullet aperture comprises one, two, three, or more annular rings that mate with one, two, three, or more corresponding annular grooves positioned on the bullet.

Assignees

• True Velocity Inc

Inventors

• Burrow Lonnie

Classifications

• F42B5/313

  all elements made of plastics · CPC title

• B22F3/225

  by injection molding · CPC title

• F42C19/0823

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

• F42B33/001

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

• F42B33/02

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