Polymer jacketed powder core projectile

Patent metadata

Field	Value
Publication number	US-2023039980-A1
Application number	US-202217883559-A
Country	US
Kind code	A1
Filing date	Aug 8, 2022
Priority date	Aug 6, 2021
Publication date	Feb 9, 2023
Grant date	—

Abstract

A method is disclosed for coating a projectile for use in an ammunition cartridge. A polymer jacket is applied to an undersized projectile core of a first standard caliber to bring the outer dimensions of the jacketed projectile into compliance with those of a second, larger caliber projectile. The polymer jacket coating may produce a non-uniform outer diameter of the polymer jacketed projectile and may include a plurality of circular cavities defined therein. The polymer-jacketed projectile may be a bullet for pistol or rifle ammunition, or a pellet, or shot for use in a shotgun shell.

First claim

What is claimed is:

1 . A polymer jacketed projectile, comprising:
an undersized core having a first diameter and a first length, wherein the first diameter is equal to a standard diameter for a first caliber projectile and wherein the first length is equal to a standard length for the first caliber projectile; a jacket covering an outer surface of the undersized core and made from polymer, wherein the jacket forms a second outer diameter and a second outer length, wherein the second outer diameter is equal to a standard diameter for a second caliber projectile and wherein the second outer length is equal to a standard length for the second caliber projectile; and wherein the jacket has a nonuniformed outer surface.

2 . The polymer-jacketed projectile of claim 1 , wherein the nonuniformed outer surface is formed by a plurality of dimples defined in the outer surface.

3 . The polymer-jacketed projectile of claim 2 , wherein the dimples have a semi-circular shape.

4 . The polymer-jacketed projectile of claim 2 , wherein the dimples have a hexagonal shape.

5 . The polymer-jacketed projectile of claim 2 , wherein the dimples have a pentagonal shape.

6 . The polymer-jacketed projectile of claim 1 , wherein the undersized core is formed from one or more metal powders.

7 . The polymer-jacketed projectile of claim 6 , wherein the metal powder is a high density tungsten metal powder.

8 . The polymer-jacketed projectile of claim 6 , wherein the metal powder further comprises one or more fillers.

9 . The polymer-jacketed projectile of claim 8 , wherein the filler is an aluminum filler material.

10 . The polymer-jacketed projectile of claim 1 , wherein the first caliber projectile is a 7 mm caliber projectile and wherein the second caliber projectile is a .308 caliber projectile.

11 . The polymer-jacketed projectile of claim 1 , wherein the undersized core has a first end defining an ogive region and a second opposite end with a boat tail.

12 . The polymer-jacketed projectile of claim 11 , wherein the jacket has an ogive region corresponding to the ogive region of the undersized core and a boat tail corresponding to the boat tail of the undersized core.

13 . The polymer-jacketed projectile of claim 1 , wherein the jacket forms a hollow point at a tip-end of the projectile.

14 . The polymer-jacketed projectile of claim 1 , wherein the jacket forms a rounded nose at a tip-end of the projectile.

15 . The polymer-jacketed projectile of claim 1 , wherein the projectile comprises a pellet.

16 . The polymer-jacketed projectile of claim 1 , wherein the projectile comprises a ball.

17 . A method for manufacturing a polymer-jacketed projectile, comprising:
preforming an undersized core from one or more metal powders by metal injection molding, wherein the undersized core has a first diameter and a first length which are equal to a standard diameter and standard length for a first caliber projectile; and molding a jacket, composed of one or more polymers, over the undersized core to form a polymer jacket with a nonuniformed outer surface, wherein the polymer jacket has a second diameter and a second length which are equal to a standard diameter and a standard length for a second caliber projectile.

18 . The method of claim 17 , wherein the preforming step further comprises placing the undersized core in a first die to form a boat tail.

19 . The method of claim 17 , wherein the preforming step further comprises placing the undersized core in a second die to form an ogive region.

20 . The method of claim 17 , wherein the nonuniformed outer surface of the molded jacket comprises a plurality of dimples each having a semi-circular shape.

Assignees

• True Velocity Ip Holdings Llc

Inventors

• Beal Harold F

Classifications

• F42B12/74

  of the core or solid body · CPC title

• F42B5/025

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

• F42B12/78 Primary

  of jackets for smallarm bullets {; Jacketed bullets or projectiles} · CPC title

• F42B12/82

  reducing friction · CPC title

• C22C1/045

  Alloys based on refractory metals · CPC title