MULTI-PIECE POLYMER AMMUNITION CARTRIDGE NOSE
The present invention provides a polymer nose for a polymeric ammunition cartridge having a generally cylindrical neck having a projectile aperture at a first end, an outer shoulder surface that extends from the generally cylindrical neck, an outer shoulder angle defined by the outer shoulder surface, an inner shoulder surface on the inside of the polymer nose opposite the outer shoulder surface, an inner shoulder angle defined by the outer shoulder surface, a skirt surface extending from the inner shoulder surface, a skirt angle defined by the skirt surface and a nose junction that extends from the outer shoulder surface to the skirt surface, wherein the nose junction is adapted to mate to a polymer cartridge.
1 . A polymer nose for a polymeric ammunition cartridge comprising:
a generally cylindrical neck having a projectile aperture at a first end;
an outer shoulder surface that extends from the generally cylindrical neck;
an outer shoulder angle defined by the outer shoulder surface;
an inner shoulder surface on the inside of the polymer nose opposite the outer shoulder surface;
an inner shoulder angle defined by the outer shoulder surface;
a skirt surface extending from the inner shoulder surface;
a skirt angle defined by the skirt surface; and
a nose junction that extends from the outer shoulder surface to the skirt surface, wherein the nose junction is adapted to mate to a polymer cartridge.
2 . The polymer nose of claim 1 , wherein the nose junction is a lap junction formed by a groove adjacent the skirt to position the shirt on the inside.
3 . The polymer nose of claim 1 , wherein the nose junction is a half lap junction with the skirt on the inside of the polymer nose.
4 . The polymer nose of claim 1 , wherein the skirt thicker than the lap junction and adapted to not fit flush to a polymer cartridge.
5 . The polymer nose of claim 1 , wherein the skirt surface is 10-100 percent longer than the outer shoulder surface.
6 . The polymer nose of claim 1 , wherein the skirt angle is between 110 and 179 degrees.
7 . The polymer nose of claim 1 , wherein an angle formed between the nose junction and the skirt is between 40 and 140 degrees.
8 . The polymer nose of claim 1 , wherein an angle formed between the nose junction and the skirt is about 90 degrees.
9 . The polymer nose of claim 1 , wherein an angle formed between the nose junction and the skirt is greater than 90 degrees.
10 . The polymer nose of claim 1 , wherein an angle formed between the nose junction and the skirt is less than 90 degrees.
11 . The polymer nose of claim 1 , wherein the shoulder comprises an outer shoulder surface having an outer angle opposite an inner shoulder surface having an inner angle and a skirt surface adjacent to the inner shoulder surface.
12 . The polymer nose of claim 9 , wherein the outer angle is the same as the inner angle.
13 . The polymer nose of claim 1 , wherein the polymer nose comprises a nylon polymer.
14 . The polymer nose of claim 1 , wherein the polymer nose comprises a fiber-reinforced polymeric composite.
15 . The polymer nose of claim 1 , wherein the polymer nose comprises between about 10 and about 70 wt % glass fiber fillers, mineral fillers, or mixtures thereof.
16 . The polymer nose of claim 1 , wherein an adhesively groove is positioned in the projectile aperture.
17 . The polymer nose of claim 1 , wherein the polymer nose comprises 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.