Frangible slug

• US 7,654,202 B2
• Filed: 02/03/2006
• Issued: 02/02/2010
• Est. Priority Date: 02/03/2006
• Status: Active Grant

• Current Assignee: R. Stresau Laboratory, Inc.
• Original Assignee: Stresau West, Inc.
• Inventors: Romero, Michael A.
• Primary Examiner(s): Carone; Michael
• Assistant Examiner(s): Weber; Jonathan C
• Application Number:
  US11/347,031
• Publication Number:
  US 20070181031A1
• Time in Patent Office: 1,460 Days
• Field of Search: 86/42, 102/498, 102/438, 102/439, 102/517, 102/518, 102/516
• US Class Current: 102/517
• CPC Class Codes: F42B 12/74 of the core or solid body
• CPC Class Codes: F42B 33/001 Devices or processes for assembling ammunition, cartridges or cartridge elements from parts
• CPC Class Codes: F42B 7/10 Ball or slug shotgun cartridges
• CPC Class Codes: F42B 8/16 containing an inert filler in powder or granular form

Abstract

Methods and articles are provided for frangible slugs. A method of manufacturing a frangible slug includes heating substantially spherical metallic powdered particles, wherein substantially all of the powdered particles have diameters larger than 125 microns and smaller than 250 microns, to form heated powdered particles. The method includes heating a microcrystalline wax, to form a melted wax. The method also includes combining the heated powdered particles with the melted wax, to form a liquid mixture. The method further includes filling a payload cavity of a frangible slug container with the liquid mixture to form a liquid mixture payload.

Claims

1. A frangible slug, comprising:

a substantially cylindrical container with a payload cavity, wherein the payload cavity is defined, at least in part, by an inside surface of the container that includes a circumferential rib, and a frangible payload within the payload cavity, wherein a weight of the frangible slug is within a range of 39.5 grams through 42.0 grams; and

the frangible payload including a solid mixture of substantially spherical metallic powdered particles bound in a binder, wherein the frangible payload;

substantially fills the payload cavity of the container and is completely contained within the container;

is exposed to an exterior of the payload cavity within the container only through an open end of the container;

is mechanically retained, at least in part, by the circumferential rib within the payload cavity after firing of the container from a cartridge; and

is mechanically retained completely within the container during travel to a solid object and until impact with the solid object causes separation of the frangible payload from the container and damage to an area of the solid object defined by the open end of the container with reduced ricochet.

2. The frangible slug of claim 1, wherein substantially all of the powdered particles have diameters smaller than 250 microns.

3. The frangible slug of claim 2, wherein substantially all of the powdered particles have diameters larger than 125 microns.

4. The frangible slug of claim 3, wherein the powdered particles are mild carbon steel.

5. The frangible slug of claim 1, wherein the binder is a microcrystalline wax.

6. The frangible slug of claim 5 wherein the microcrystalline wax has a drop melt point of at least 170 degrees Fahrenheit.

7. The frangible slug of claim 6, wherein the powdered particles form at least 90 percent of a weight of the frangible payload.

8. The frangible slug of claim 7, wherein the powdered particles form 96 percent of the weight of the frangible payload.

9. A firearm cartridge, comprising:

propellant, configured to accelerate a composite projectile package to a particular muzzle velocity after the cartridge is fired, wherein a weight of the composite projectile package is within a range of 39.5 grams through 42.0 grams; and

the composite projectile package including a frangible payload and a container, wherein the frangible payload;

includes a solid mixture of substantially spherical metallic powdered particles bound in a binder;

substantially fills a payload cavity of the container and is completely contained within the container;

is mechanically retained, at least in part, by a circumferential rib within the payload cavity after firing of the container from the cartridge;

is mechanically retained completely within the container during travel to a solid object and until impact with the solid object causes separation of the frangible payload from the container and damage to an area of the solid object defined by an open end of the container with reduced ricochet; and

is configured to substantially disintegrate when the package impacts the solid object.

10. The firearm cartridge of claim 9, wherein the frangible payload is configured to substantially disintegrate over an area less than 2 inches in diameter.

11. The firearm cartridge of claim 9, wherein the frangible payload is configured to substantially disintegrate when the package impacts a stationary solid object at a velocity that is substantially equal to the particular muzzle velocity.

12. The firearm cartridge of claim 9, wherein the frangible payload is exposed to an exterior of the payload cavity within the container only through an open end of the container.

13. The firearm cartridge of claim 9, wherein the cartridge is configured as a shotgun shell.

14. The firearm cartridge of claim 9, wherein substantially all of the powdered particles have diameters larger than 125 microns and smaller than 250 microns.

15. A method of configuring a frangible slug, comprising:

forming the frangible slug as a composite projectile package that includes a frangible payload and a container, wherein a weight of the frangible slug is within a range of 39.5 grams through 42.0 grams;

forming the frangible payload as a solid mixture of substantially spherical metallic powdered particles bound in a binder;

substantially filling a payload cavity of the container with the frangible payload such that the frangible payload is completely contained within the container;

mechanically retaining the frangible payload, at least in part, by a circumferential rib within the payload cavity after firing of the container from the cartridge;

mechanically retaining the frangible payload completely within the container during travel to a solid object and until impact with the solid object causes separation of the frangible payload from the container and damage to an area of the solid object defined by an open end of the container with reduced ricochet; and

configuring the frangible payload to substantially disintegrate when the package impacts the solid object.

16. The method of claim 15, wherein configuring the frangible payload to substantially disintegrate includes configuring the frangible payload to substantially disintegrate over an area less than 2 inches in diameter.

17. The method of claim 16, wherein configuring the frangible payload to substantially disintegrate over the area less than 2 inches in diameter includes, at least in part, configuring the frangible payload such that the frangible payload is completely contained within the container, and is exposed to an exterior of the payload cavity within the container only through the open end of the container, until the impact with the solid object causes the frangible payload to pass through the open end of the container.

18. The method of claim 17, wherein configuring the frangible slug includes configuring for disabling hardware of a door as a result of impacting the door hardware.

19. The method of claim 18 wherein configuring for disabling the door hardware includes utilizing a weight of the mixture of substantially spherical metallic powdered particles that imparts sufficient kinetic energy to the door hardware when impacting the door hardware.

20. The method of claim 18, wherein configuring for disabling the door hardware includes reducing a likelihood of the frangible payload ricocheting, at least in part, by the frangible payload substantially disintegrating over the area less than 2 inches in diameter.