Cartridge and bullet with controlled expansion

• US 8,413,587 B2
• Filed: 04/23/2012
• Issued: 04/09/2013
• Est. Priority Date: 05/16/2005
• Status: Active Grant

• Current Assignee: Hornady Manufacturing Company
• Original Assignee: Hornady Manufacturing Company
• Inventors: Emary, David E.
• Primary Examiner(s): HAYES, BRET C
• Application Number:
  US13/453,877
• Publication Number:
  US 20130014668A1
• Time in Patent Office: 351 Days
• Field of Search: 102/501, 102/506, 102/507, 102/508, 102/509, 102/510
• US Class Current: 102/506
• CPC Class Codes: F42B 12/20 of high-explosive type F42B12/44 takes precedence
• CPC Class Codes: F42B 12/34 expanding before or on impact, i.e. of dumdum or mushroom type
• CPC Class Codes: F42B 30/02 Bullets

Abstract

A bullet or a cartridge containing a bullet having an elongated body with a forward end and an opposed rear end. The body has an intermediate cylindrical portion between the rear and forward ends, and the front end of the body defines a cavity. A resilient nose element is received in the cavity. The nose element may be an elastomer, and may be a cylindrical body. The cavity may be a cylindrical bore, and the nose element may be closely encompassed within the bore. The forward end of the nose element may be flat, and may be flush with the forward end of the body.

Claims

1. A firearm ammunition component comprising:

an elongated body;

the body having a forward end;

the body having a rear end opposite the forward end;

the body having an intermediate cylindrical portion between the rear and forward ends;

the front end of the body defining a cavity;

a resilient nose element, at least a portion of which is received in the cavity, wherein the nose element is an elastomer that can be compressed to less than 50% of its length repeatedly without permanent deformation; and

wherein the nose element is an elongated body having opposed ends.

2. The component of claim 1 wherein the nose element is an elastomer having a Shore A hardness less than or equal to 90.

3. The component of claim 1 wherein the nose element is an elastomer having a Shore A hardness greater than or equal to 50.

4. The component of claim 1 wherein the cavity has a length to diameter ratio of at least 1.5 and the nose element has a length to diameter ratio of at least 1.5.

5. The component of claim 1 wherein the nose element is selected from the group consisting of any synthetic or natural elastomer including rubber and silicone, metal and other springs, and compressible gas-filled bladders and bellows.

6. The component of claim 1 wherein the body has a caliber having a velocity, wherein the nose element is an elastomer having a Shore A hardness less than or equal to 55 when the velocity of the caliber of the body is 700-800 ft./s.

7. The component of claim 1 wherein the body has a caliber having a velocity, wherein the nose element is an elastomer having a Shore A hardness less than or equal to 80 when the velocity of the caliber of the body is 1200-1500 ft./s.

8. The component of claim 1 wherein the body has a caliber having a velocity, wherein the nose element is an elastomer having a Shore D hardness greater than or equal to 55 and less than or equal to 90 when the velocity of the caliber of the body is 2500-3000 ft./s.

9. The component of claim 1 wherein the body has a cavity length/diameter ratio greater than or equal to 1.25.

10. The component of claim 1 wherein the body has a cavity length/diameter ratio less than or equal to 1.75.

11. A firearm ammunition component comprising:

an elongated body;

the body having a forward end;

the body having a rear end opposite the forward end;

the body having an intermediate cylindrical portion between the rear and forward ends;

the front end of the body defining a cavity;

a resilient nose element, at least a portion of which is received in the cavity;

wherein the nose element is an elongated body having opposed ends; and

wherein the body has a caliber and the nose element is an elastomer having a Shore A hardness that is less than or equal to 1/100 of an X-axis velocity function for the caliber of the body and greater than or equal to 1/500 of the X-axis velocity function for the caliber of the body.

12. The component of claim 11 wherein the body has a caliber and the nose element is an elastomer having a Shore A hardness that is less than or equal to 1/140 of an X-axis velocity function for the caliber of the body and greater than or equal to 1/325 of the X-axis velocity function for the caliber of the body.

13. The component of claim 11 wherein the body has a caliber and the nose element is an elastomer having a Shore A hardness that is equal to 1/250 of an X-Axis velocity function for the caliber of the body.

14. The component of claim 11 wherein the body has a caliber selected from the group consisting of .380 ACP, 9 mm, 38 Special, 40 S&

W, and .45 ACP.

15. A firearm ammunition component comprising:

an elongated body;

the body having a forward end;

the body having a rear end opposite the forward end;

the body having an intermediate cylindrical portion between the rear and forward ends;

the front end of the body defining a cavity;

a resilient nose element, at least a portion of which is received in the cavity; and

wherein the nose element is an elongated body having opposed ends, and wherein the body of the nose element is end-to-end symmetrical such that orientation is not critical for manufacturing.

16. The component of claim 15 wherein the nose element is an elastomer that can be compressed to less than 50% of its length repeatedly without permanent deformation.

17. The component of claim 15 wherein the nose element is an elastomer having a Shore A hardness less than or equal to 90.

18. The component of claim 15 wherein the nose element is an elastomer having a Shore A hardness greater than or equal to 50.

19. The component of claim 15 wherein the cavity has a length to diameter ratio of at least 1.5.

20. The component of claim 15 wherein the nose element has a length to diameter ratio of at least 1.5.