Hollow point bullet and method of manufacturing same

Patent metadata

Field	Value
Publication number	US-9383178-B2
Application number	US-201514614678-A
Country	US
Kind code	B2
Filing date	Feb 5, 2015
Priority date	Feb 6, 2014
Publication date	Jul 5, 2016
Grant date	Jul 5, 2016

Abstract

Hollow point bullets and methods of manufacturing such bullets are herein disclosed. The disclosed bullets include a monolithic core encased by a metal jacket. The jacket includes a plurality of v-shaped channels formed on the inner surface of the sidewall of the jacket. The core includes a conical recess formed therein and a cavity in communication with the conical recess. The cavity formed in the core may have a cross-section shape defined by a plurality of points spaced equidistantly about the circumference of an imaginary circle. A plurality of stress risers may be formed in the core, each stress riser extending from the cavity to a v-shaped channel in coincidence with a point of the cross-section shape of the cavity.

First claim

What is claimed is:

1. A bullet comprising:
a center axis;
a substantially cylindrical core comprising:
a nose portion having a conical recess formed therein; the core having a cavity formed therein, the cavity extending along the center axis and in communication with the conical recess, the cavity having a cross-section shape defined by a plurality of points spaced equidistantly around a circumference of an imaginary circle; and
a plurality of stress risers formed in the core, each stress riser extending radially outward from the center axis in coincidence with a point of the cross-section shape; and

a jacket surrounding the core, the jacket comprising:
a base;
a sidewall comprising a top edge, an inner surface and an outer surface, the inner surface of the sidewall comprising a plurality of v-shaped channels formed therein, each v-shaped channel being adjacent to one of the stress risers and extending longitudinally from the top edge such that a distance from the inner surface of the sidewall to the outer surface of the sidewall increases as a function of distance from the top edge toward the base.

2. The bullet of claim 1 , wherein the cross-section shape comprises between 3 and 8 points.

3. The bullet of claim 1 , wherein the sidewall comprises between 3 and 8 v-shaped channels.

4. The bullet of claim 1 , wherein the core is a monolith.

5. The bullet of claim 1 , further comprising a plurality of indentations formed in the outer surface of the sidewall about a circumference of the jacket.

6. The bullet of claim 5 , wherein each indentation is angled with respect to the center axis such that a deeper portion of the indentation is closer to the base of the jacket and a shallower portion of the indentation is closer to the top edge of the jacket.

7. The bullet of claim 1 , wherein the conical recess has a 45 degree angle with respect to the center axis.

8. A bullet comprising:
a center axis;
a core; and
a jacket surrounding the core, the jacket comprising a base and a sidewall having a top edge, an outer surface, an inner surface, and a plurality of indentations formed in the outer surface about a circumference of the jacket, each indentation being angled with respect to the center axis such that a bottom portion of each indentation extends at least 50% more into the outer wall than a top portion of each indentation, wherein the inner surface of the sidewall comprises a plurality of v-shaped channels formed therein, each v-shaped channel extending longitudinally from the top edge such that a distance from the inner surface of the sidewall to the outer surface of the sidewall increases as a function of distance from the top edge toward the base.

9. The bullet of claim 8 , further comprising a plurality of stress risers formed in the core, each stress riser extending from the center axis to the inner surface of the jacket sidewall.

10. The bullet of claim 8 , wherein the core comprises a nose portion having a conical recess formed therein.

11. The bullet of claim 8 , further comprising a cavity extending at least partially into the core along the center axis.

Assignees

• Sig Sauer Inc

Inventors

• Powers Jr Daniel L

Classifications

• F42B12/34 Primary

  expanding before or on impact, i.e. of dumdum or mushroom type · CPC title

• F42B12/78

  of jackets for smallarm bullets {; Jacketed bullets or projectiles} · CPC title