Hunting bullet with reduced aerodynamic resistance

• US 20070028793A1
• Filed: 09/09/2004
• Published: 02/08/2007
• Est. Priority Date: 09/10/2003
• Status: Active Grant

• Current Assignee: Jean-Claude Sauvestre
• Original Assignee: Jean-Claude Sauvestre
• Inventors: Sauvestre, Jean-Claude
• Granted Patent: US 7,814,837 B2
• Time in Patent Office: Days
• US Class Current: 102/508
• CPC Class Codes: F42B 12/34 expanding before or on impact, i.e. of dumdum or mushroom type

Abstract

The invention relates to ammunition for hunting guns.

The bullet is of the type comprising an internal shaft (4) with a rigidity equal to or greater than that of the body of the bullet, disposed in a hole drilled in the body of the bullet along its axis, and this internal shaft (4) is set back from the orifice (8) of the hole, the latter, situated on the axis, has a smaller diameter than that of the internal shaft (4), and the wall of the ogival head (3) of the bullet body (2) comprises one or more deformation notches close to the orifice of the hole. Applicable to the improvement of the terminal efficiency of small, medium or large caliber hunting guns with the caliber of the gun or undersizes.

Claims

1. A bullet for a small, medium or large caliber gun, with the caliber of the gun or undersize, of the type comprising an internal shaft with a rigidity equal to or greater than that of the body of the bullet, disposed in a hole drilled in the body of the bullet along its axis, characterized in that the internal shaft is set back from the orifice of the hole, the latter, situated on the axis, has a smaller diameter than that of the internal shaft, and the wall of the ogival head of the bullet body comprises one or more deformation notches close to the orifice of the hole.

2. The bullet as claimed in claim 1, wherein it comprises in its front portion a cavity of conical or cylindro-conical shape delimited on its large base by the front face of the internal shaft.

3. The bullet as claimed in claim 1, wherein the deformation notches of the ogival head are made by a narrowing of the ogival head, separating the ogival nose from the rear portion of the ogive.

4. The bullet as claimed in claim 3, wherein the cross section of the large base of the ogival nose is slightly larger than that of the front of the rear portion of the ogive.

5. The bullet as claimed in claim 3, wherein the narrowing is situated at the base of the conical or cylindro-conical internal cavity formed in front of the internal shaft or slightly in front of this base.

6. The bullet as claimed in claim 3, wherein the internal cavity is cylindro-conical in shape and the narrowing is situated at the line where the conical and cylindrical surfaces meet.

7. The bullet as claimed in claim 3, wherein the narrowing made in the wall of the ogive forms a crank between the large base of the ogival nose and the front end of the rear portion of the ogive, the height of this crank lying between 0.05 and 1 mm.

8. The bullet as claimed in claim 1, wherein the ratio of the diameter d₁, of the orifice to the diameter d of the internal shaft lies between 0.1:

1 and 0.9;

1.

9. The bullet as claimed in in claim 1, wherein the nose of the ogive comprises a flat whose external diameter d₂ is such that the ratio d₂/d lies between 0.3:

1 and 1.5;

1.

10. The bullet as claimed in claim 9, wherein the ratio d₂/d lies between 0.6:

1 and 1;

1, while the diameter d₁ of the orifice is such that the ratio d₁/d lies between 0.3;

1 and 0.6;

1.

11. The bullet as claimed in claim 4, wherein the narrowing is situated at the base of the conical or cylindro-conical internal cavity formed in front of the internal shaft or slightly in front of this base.

12. The bullet as claimed in claim 4, wherein the internal cavity is cylindro-conical in shape and the narrowing is situated at the line where the conical and cylindrical surfaces meet.

13. The bullet as claimed in claim 4, wherein the narrowing made in the wall of the ogive forms a crank between the large base of the ogival nose and the front end of the rear portion of the ogive, the height of this crank lying between 0.05 and 1 mm.

14. The bullet as claimed in claim 5, wherein the narrowing made in the wall of the ogive forms a crank between the large base of the ogival nose and the front end of the rear portion of the ogive, the height of this crank lying between 0.05 and 1 mm.

15. The bullet as claimed in claim 6, wherein the narrowing made in the wall of the ogive forms a crank between the large base of the ogival nose and the front end of the rear portion of the ogive, the height of this crank lying between 0.05 and 1 mm.

16. The bullet as claimed in claim 2, wherein the nose of the ogive comprises a flat whose external diameter d₂ is such that the ratio d₂/d lies between 0.3:

1 and 1.5;

1.

17. The bullet as claimed in claim 3, wherein the nose of the ogive comprises a flat whose external diameter d₂ is such that the ratio d₂/d lies between 0.3:

1 and 1.5;

1.

18. The bullet as claimed in claim 4, wherein the nose of the ogive comprises a flat whose external diameter d₂ is such that the ratio d₂/d lies between 0.3:

1 and 1.5;

1.