Hunting bullet comprising an expansion ring

• US 8,087,359 B2
• Filed: 08/03/2009
• Issued: 01/03/2012
• Est. Priority Date: 03/08/2004
• Status: Active Grant

• Current Assignee: Jean-Claude Sauvestre
• Original Assignee: Jean-Claude Sauvestre
• Inventors: Sauvestre, Jean-Claude
• Primary Examiner(s): HAYES, BRET C
• Application Number:
  US12/534,639
• Publication Number:
  US 20090288572A1
• Time in Patent Office: 883 Days
• Field of Search: 102507-510, 102/514, 102520-523, 102/439, 102/398
• US Class Current: 102/439
• 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
• CPC Class Codes: F42B 5/045 of telescopic type F42B5/184 takes precedence
• CPC Class Codes: F42B 7/10 Ball or slug shotgun cartridges

Abstract

Ammunition consists of a full-caliber or sub-caliber bullet, of the type comprising a substantially rigid bullet body and a deformable part, the deformable part consisting of an approximately cylindrical expansion ring, the rear part of which is fitted onto the front part of the bullet body.

Claims

1. A round for small, medium and large caliber guns, comprising a full-caliber or subcaliber lead free metal bullet comprising a substantially rigid bullet body and a deformable part, wherein the deformable part comprises an approximately cylindrical expansion ring, the rear part of which is fitted onto the front part of the bullet body, wherein accelerated expansion is provided while the loss of mass by fragmentation is prevented, and the expansion ring cooperates with the bullet body to prevent recoil of the bullet body upon impact.

2. The round as claimed in claim 1, wherein the expansion ring includes, on a front face, an emergent frustoconical bore, which cooperates with the front face of the head of the bullet body in order to form an open cavity.

3. The round as claimed in claim 2, wherein the emergent frustoconical bore on the front face of the expansion ring forms, with the external cylindrical part of the ring, a narrow expansion flat or lip.

4. The round as claimed in claim 3, wherein the expansion ring is fitted onto the bullet body by screwing, friction welding, shrink-fitting or force-fitting.

5. The round as claimed in claim 4, wherein the ring is fitted onto the bullet body by a diamond-shaped knurled contact surface.

6. The round as claimed in claim 2, wherein the base of the emergent frustoconical bore comprises an annular bearing surface that bears against the cylindrical surface of the head of the bullet body and is capable of sliding over said cylindrical surface.

7. The round as claimed in claim 6, wherein the annular bearing surface is separated from the rear part of the cylindrical ring by an annular groove.

8. The round as claimed in claim 1, wherein the rear part of the ring comprises a stop that bears against a shoulder on the bullet body.

9. The round as claimed in claim 1, wherein the outer surface of the cylindrical ring is slightly conical.

10. The round as claimed in claim 9, wherein the outer surface of the cylindrical ring has a curvilinear ogival shape.

11. The round as claimed in claim 1, wherein the front face of the expansion ring lies substantially in the plane of the face of the head of the bullet body.

12. The round as claimed in claim 1, wherein the front face of the expansion ring is protruding from the head of the bullet body.

13. The round as claimed in claim 1, wherein the front face of the expansion ring is set back relative to the plane of the head of the bullet body.