Polymer ammunition cartridge having a wicking texturing

Patent metadata

Field	Value
Publication number	US-9631907-B2
Application number	US-201514751535-A
Country	US
Kind code	B2
Filing date	Jun 26, 2015
Priority date	Nov 10, 2010
Publication date	Apr 25, 2017
Grant date	Apr 25, 2017

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,
a flash hole groove that extends circumferentially about the primer flash aperture in the primer recess, and
a locking groove that extends circumferentially about the top surface;
a substantially cylindrical polymeric middle body comprising a first polymer that extends from a cylindrical middle body coupling region to the substantially cylindrical primer insert, wherein the first polymer is over-molded over the substantially cylindrical coupling element to the locking groove and into the primer flash aperture to the flash hole groove;
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 middle body 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.

12. 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.

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

Assignees

• True Velocity Inc

Inventors

• Burrow Lonnie

Classifications

• 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

• F42B5/307 Primary

  formed by assembling several elements · 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

• 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