Polymer ammunition and cartridge primer insert

Patent metadata

Field	Value
Publication number	US-10571230-B2
Application number	US-201816111715-A
Country	US
Kind code	B2
Filing date	Aug 24, 2018
Priority date	Nov 10, 2010
Publication date	Feb 25, 2020
Grant date	Feb 25, 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 0.1 to 0.2; a first segment extending from the second segment and terminates at a tip, wherein the first segment has a first segment distance from 0.06 to 0.14 inches and the second segment has a second segment distance from 0.05 to 0.15 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 is about 0.14 inches; a first segment extending from the second segment and terminates at a tip, wherein the first segment has a first segment distance is about 0.1 inches and a first segment angle from +6 to −6 degrees from perpendicular to the top surface and the second segment has a second segment distance is about 0.1 inches, wherein the second segment has a second segment angle from +3 to −3 degrees relative to the first segment angle;
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 second segment has a second segment angle is about 1 degrees and the first segment has a first segment is about 3 degrees.

4. The primer insert of claim 1 , 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.

5. The primer insert of claim 1 , further comprising an insert height that extends from the top surface to the tip, wherein the insert height is about 0.6 inches.

6. The primer insert of claim 1 , further comprising an insert height that extends from the top surface to the tip, wherein the insert height is about 0.65 inches.

7. The primer insert of claim 1 , further comprising an insert height that extends from the top surface to the tip, wherein the insert height is about 0.75 inches.

8. The primer insert of claim 1 , wherein the first segment has a first segment distance is about 0.085 inches, the second segment has a second segment distance is about 0.12 inches and the transition region is concave with a radius of about 0.15 inches.

9. The primer insert of claim 8 , 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.

10. The primer insert of claim 8 , 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.

11. The primer insert of claim 8 , further comprising an insert height that extends from the top surface to the tip, wherein the insert height is about 0.6 inches.

12. The primer insert of claim 8 , further comprising an insert height that extends from the top surface to the tip, wherein the insert height is about 0.65 inches.

13. The primer insert of claim 8 , further comprising an insert height that extends from the top surface to the tip, wherein the insert height is about 0.75 inches.

14. The primer insert of claim 1 , wherein the first segment has a first segment distance is about 0.12 inches, the second segment has a second segment distance is about 0.085 inches and the transition region is concave with a radius of about 0.15 inches.

15. The primer insert of claim 14 , 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.

16. The primer insert of claim 14 , 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.

17. The primer insert of claim 14 , further comprising an insert height that extends from the top surface to the tip, wherein the insert height is about 0.65 inches.

18. The primer insert of claim 14 , further comprising an insert height that extends from the top surface to the tip, wherein the insert height is about 0.75 inches.

19. The primer insert of claim 1 , wherein the first segment has a first segment distance is about 0.08 inches, the second segment has a second segment distance is about 0.1 inches and the transition region is concave with a radius of about 0.14 inches.

Assignees

• True Velocity Ip Holdings Llc

Inventors

• Burrow Lonnie

Classifications

• 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

• F42B5/307 Primary

  formed by assembling several elements · CPC title

• F42B5/313

  all elements made of plastics · CPC title

• F42B5/02

  Cartridges, i.e. cases with charge and missile · CPC title

• F42C19/0807

  characterised by the particular configuration of the transmission channels from the priming energy source to the charge to be ignited, e.g. multiple channels, nozzles, diaphragms or filters · CPC title