Polymer ammunition and cartridge primer insert

Patent metadata

Field	Value
Publication number	US-10578409-B2
Application number	US-201816111673-A
Country	US
Kind code	B2
Filing date	Aug 24, 2018
Priority date	Nov 10, 2010
Publication date	Mar 3, 2020
Grant date	Mar 3, 2020

Abstract

The present invention provides a primer insert for a polymer ammunition cartridge comprising: a top surface; a bottom surface opposite the top surface; a coupling element that extends from the bottom surface, wherein the coupling element comprises an interior surface and an exterior surface, wherein the interior surface comprises: a transition region that transitions from the bottom surface to a second segment wherein the transition region has a radius of from 0.02 to 0.08; a first segment extending from the second segment and terminates at a tip, wherein the first segment has a first segment distance from 0.05 to 0.09 inches and the second segment has a second segment distance from 0.05 to 0.09 inches, wherein the second segment has a second segment angle from +3 to −3 degrees relative to the first segment angle and the first segment has a first segment angle from +6 to −6 degrees from perpendicular to the top surface; a primer recess in the top surface that extends toward the bottom surface; a primer flash aperture positioned in the primer recess through the bottom surface; and a flash aperture groove in the primer recess and positioned around the primer flash aperture and adapted to receive a polymer overmolding through the primer flash aperture.

First claim

What is claimed is:

1. A primer insert for a polymer ammunition cartridge comprising:
a top surface;
a bottom surface opposite the top surface;
a coupling element that extends from the bottom surface, wherein the coupling element comprises an interior surface and an exterior surface, wherein the interior surface comprises: a transition region that transitions from the bottom surface to a second segment wherein the transition region has a radius of from 0.02 to 0.08 inches; a first segment extending from the second segment and terminates at a tip, wherein the first segment has a first segment distance from 0.05 to 0.09 inches and the second segment has a second segment distance from 0.05 to 0.09 inches, wherein the second segment has a second segment angle from +3 to −3 degrees relative to a first segment angle of the first segment, wherein the first segment angle is from +6 to −6 degrees from perpendicular to the top surface;
a primer recess in the top surface that extends toward the bottom surface;
a primer flash aperture positioned in the primer recess through the bottom surface; and
a flash aperture groove in the primer recess and positioned around the primer flash aperture and adapted to receive a polymer overmolding through the primer flash aperture.

2. The primer insert of claim 1 , wherein the transition region comprises one or more straight segments, one or more curved segments or a combination of one or more straight segments and one or more curved segments.

3. The primer insert of claim 1 , wherein the first segment has a first segment distance is about 0.07 inches, the second segment has a second segment distance is about 0.07 inches and the transition region is concave with a radius of about 0.05 inches.

4. The primer insert of claim 3 , wherein the second segment has a second segment angle is about 1 degrees and the first segment has a first segment is about 3 degrees.

5. The primer insert of claim 3 , wherein the second segment has a second segment angle is about 3 degrees and the first segment has a first segment is about 0 degrees.

6. The primer insert of claim 3 , further comprising an insert height that extends from the top surface to the tip, wherein the insert height is about 0.36 inches.

7. The primer insert of claim 3 , further comprising an insert height that extends from the top surface to the tip, wherein the insert height is about 0.38 inches.

8. The primer insert of claim 3 , further comprising an insert height that extends from the top surface to the tip, wherein the insert height is about 0.4 inches.

9. The primer insert of claim 1 , wherein the first segment has a first segment distance is about 0.068 inches, the second segment has a second segment distance is about 0.073 inches and the transition region is concave with a radius of about 0.05 inches.

10. The primer insert of claim 9 , wherein the second segment has a second segment angle is about 1 degrees and the first segment has a first segment is about 3 degrees.

11. The primer insert of claim 9 , wherein the second segment has a second segment angle is about 3 degrees and the first segment has a first segment is about 0 degrees.

12. The primer insert of claim 9 , further comprising an insert height that extends from the top surface to the tip, wherein the insert height is about 0.36 inches.

13. The primer insert of claim 9 , further comprising an insert height that extends from the top surface to the tip, wherein the insert height is about 0.38 inches.

14. The primer insert of claim 9 , further comprising an insert height that extends from the top surface to the tip, wherein the insert height is about 0.4 inches.

15. The primer insert of claim 1 , wherein the first segment has a first segment distance is about 0.072 inches, the second segment has a second segment distance is about 0.068 inches and the transition region is concave with a radius of about 0.05 inches.

16. The primer insert of claim 15 , wherein the second segment has a second segment angle is about 1 degrees and the first segment has a first segment is about 3 degrees.

17. The primer insert of claim 15 , wherein the second segment has a second segment angle is about 3 degrees and the first segment has a first segment is about 0 degrees.

18. The primer insert of claim 1 , wherein the first segment has a first segment distance is about 0.066 inches, the second segment has a second segment distance is about 0.075 inches and the transition region is concave with a radius of about 0.05 inches.

19. The primer insert of claim 1 , wherein the first segment has a first segment distance is about 0.065 inches, the second segment has a second segment distance is about 0.074 inches and the transition region is concave with a radius of about 0.05 inches.

Assignees

• True Velocity Ip Holdings Llc

Inventors

• Burrow Lonnie

Classifications

• B22F3/225

  by injection molding · CPC title

• F42B5/313

  all elements made of plastics · CPC title

• F42C19/0823

  Primers or igniters for the initiation or the propellant charge in a cartridged ammunition (primers for caseless ammunition F42C19/085) · CPC title

• F42B33/00

  Manufacture of ammunition; Dismantling of ammunition; Apparatus therefor (F42B5/188 takes precedence; manufacturing processes for hollow charges F42B1/036; manufacture of blasting cartridge initiators F42B3/195) · CPC title

• B22F3/004

  Filling molds with powder (feeding material to presses in general B30B15/302) · CPC title