Lead free, composite polymer based bullet and cartridge case, and method of manufacturing

Abstract

A lead-free, composite polymer based bullet and cartridge case and methods of manufacturing the same, wherein the composite polymer material includes a tungsten metal powder, nylon 6/6, nylon 6, short glass fibers, as well as additives and stabilizers. The cartridge case includes a lip lock configured to matingly engage a cannelure formed along an outer circumferential surface of the bullet. The cartridge case also includes resilient walls wherein the case may snap fit onto the bullet. The bullet and cartridge case may be formed in a single step process by injection molding or a two step process including injection molding and a welding process.

Description

CROSS-REFERENCE TO RELATED APPLICATION [0001] This non-provisional application claims the benefit of U.S. Provisional patent application Ser. No. 60 / 421,782, filed Oct. 29, 2002.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to bullets / projectiles (hereinafter referred to as bullets) and cartridge cases. More particularly, the present invention relates to lead free, composite polymer based bullets and cartridge cases, and a method of manufacturing the same. [0004] 2. Description of Related Art [0005] It is well known in the industry to manufacture bullets and corresponding cartridge cases from either brass or steel. Typically, industry design calls for materials that are strong enough to withstand extreme operating pressures and which can be formed into a cartridge case to hold the bullet, while simultaneously resist rupturing during the firing process. [0006] Conventional ammunition typically includes four basic components, that is...

AI Technical Summary

Benefits of technology

[0031] It is an aspect of the present invention to provide a bullet, a cartridge case, and method of manufacturing the same that overcome the drawbacks of the conventional brass or lead bullets, cartridge case, and laborious, yet required, methods of manufacturing given the material compositions of the same.

[0032] In particular, it is an aspect of the present invention to provide a lead free, composite polymeric bullet and cartridge case, and method of manufacturing the same by injection molding requiring one or two steps, dependent on the cartridge caliber, to manufacture the cartridge case as opposed to the twenty three steps commonly needed to prepare the conventional brass cartridge cases. Furthermore, the present invention also manufactures bullets in a single step by injection molding, as opposed to as many as six (6) steps needed to manufacture the conventional lead based bullets.

Problems solved by technology

However, no specific range of ingredients was ever provided.

Booth does not disclose using both nylon materials together in the same bullet.

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