Cannelured frangible projectile and method of canneluring a frangible projectile

• US 20070144395A1
• Filed: 10/24/2006
• Published: 06/28/2007
• Est. Priority Date: 02/10/2004
• Status: Active Grant

• Current Assignee: Sinterfire Incorporated (Sinterfire Holdings LLC)
• Original Assignee: International Cartridge Corporation
• Inventors: Yaich, Daniel
• Granted Patent: US 7,322,297 B2
• Time in Patent Office: Days
• US Class Current: 102/439
• CPC Class Codes: B23B 27/06 Profile cutting tools, i.e. forming-tools
• CPC Class Codes: F42B 30/02 Bullets
• CPC Class Codes: F42B 33/001 Devices or processes for assembling ammunition, cartridges or cartridge elements from parts
• CPC Class Codes: F42B 33/005 Crimping cartridge cases on projectiles

Abstract

A method of canneluring a frangible projectile includes the steps of rotating the projectile at a high speed, and cutting the cannelure into the projectile to form a frangible cannelured projectile. To ensure that the body is not damaged during cutting, the cutting tool has bevels on each side of a square, generally flat, cutting surface. A frangible cannelured projectile made by the foregoing method includes a groove having a generally flat base and beveled edges.

Claims

1. (canceled)

2. (canceled)

3. (canceled)

4. A frangible bullet having a cannelure, comprising

a body made of a compressed powdered metal material that disintegrates upon contact with an object;

and

a cannelure cut into the compressed powered metal material, wherein the cannelure includes beveled edges and a generally flat base.

5. A frangible bullet as claimed in claim 4, wherein the beveled edges are at an approximately 45 degree angle relatively to a flat base of the cannelure.

6. A frangible bullet as claimed in claim 4, wherein the compressed powdered metal material comprises a lead-free powder material.

7. A frangible bullet as claimed in claim 6, wherein the compressed powdered metal material comprises a copper tin powder mixture.

8. A frangible bullet as claimed in claim 4, wherein the bullet is a small arms bullet.

9. A frangible bullet as claimed in claim 8, wherein the bullet is a rifle bullet and the cannelure is arranged to be crimped to a cartridge.

10. (canceled)