Bullet for smooth bore shotguns

• US 4,301,733 A
• Filed: 04/20/1979
• Issued: 11/24/1981
• Est. Priority Date: 04/22/1978
• Status: Expired due to Term

• Current Assignee: Moises Arciniega Blanco
• Original Assignee: Moises Arciniega Blanco
• Inventors: Arciniega Blanco, Moises
• Primary Examiner(s): TUDOR, HAROLD JAY
• Application Number:
  US06/032,106
• Time in Patent Office: 949 Days
• Field of Search: 102/92.1-92.5
• US Class Current: 102/517
• CPC Class Codes: F42B 10/24 with inclined grooves
• CPC Class Codes: F42B 7/10 Ball or slug shotgun cartridges

Abstract

A bullet for a smooth bore shotgun has a nose part preferably of metal and a base part preferably of plastic material. The two parts are assembled together, e.g. by engagement of a male projection on one of the parts into a female recess on the other of the parts.

Claims

1. A bullet of the type for use in a smooth bore shotgun, said bullet comprising:

a metal nose part having a forward tip end, a rear end and a trunk joining said tip and rear ends, said trunk having uniformly circumferentially distributed around the outer surface thereof a plurality of ribs inclined to the longitudinal direction of said nose part, each said rib having a forward end and a rear end, the radial thickness or height of each said rib having a maximum at said forward end thereof and continuously decreasing to zero at said rear end thereof;

a plastic base part having a forward end and a rear end, said base part having adjacent said forward end a conical portion widening from said foward end, and said base part having a cylindrical portion joining said conical portion and extending therefrom toward said rear end; and

means for tightly joining said nose part to said base part solely by means of friction fit therebetween, said joining means comprising a male projection extending from one of said nose part or said base part and a female recess provided in the other of said nose part or said base part, said projection and recess being dimensioned such that said projection is tightly received within said recess upon pressing of said nose part and said base part together.

2. A bullet as claimed in claim 1, wherein each said rib tapers from a widest portion at said rear end to a point at said forward end.

3. A bullet as claimed in claim 1, wherein said tip end of said nose part is conical.

4. A bullet as claimed in claim 1, wherein said tip end of said nose part is rounded.

5. A bullet as claimed in claim 1, wherein said trunk of said nose part smoothly joins said tip end of said nose part, and said tip end is ogival.

6. A bullet as claimed in claim 1, wherein said nose part is formed of a lead alloy.

7. A bullet as claimed in claim 1, wherein said base part has adjacent said rear end thereof a chamfered portion for reducing aerodynamic resistance of the bullet at subsonic speeds.

8. A bullet as claimed in claim 7, further comprising a disc-shaped thrust bearing adapted to be positioned between said base part and an explosive charge, said thrust bearing having a forward flange adapted to engage said chamfered portion of said base part and a rearward flange adapted to seal off gases resulting upon firing of the charge.

9. A bullet as claimed in claim 1, wherein said cylindrical portion of said base part has therein plural circumferentially extending annular grooves.

10. A bullet as claimed in claim 1, wherein said cylindrical portion includes a plurality of longitudinally extending ribs.

11. A bullet as claimed in claim 1, wherein said rear end of said base part has therein a cavity.

12. A bullet as claimed in claim 1, wherein said projection extends from said rear end of said nose part, and said recess is in said forward end of said base part.

13. A bullet is claimed in claim 1 or claim 12, wherein said projection is tubular.

14. A bullet as claimed in claim 3, wherein said recess is annular.

15. A bullet as claimed in claim 3, wherein said tubular projection has on the outer surface thereof at least one annular retaining ring.

16. A bullet as claimed in claim 1 or claim 12, wherein said projection is cylindrical.

17. A bullet as claimed in claim 1 or claim 12, wherein said projection and said recess are conical.

18. A bullet as claimed in claim 12, wherein said projection has an internal axial recess, and further comprising an expansion element positioned within said axial recess, said expansion element having a pointed tip of a metal harder than the metal of said nose part.

19. A bullet as claimed in claim 1, wherein said projection extends from said forward end of said base part, and said recess is in said rear end of said nose part.

20. A bullet as claimed in claim 19, wherein said projection is cylindrical.