Polymer ammunition and cartridge primer insert

• US 10,578,409 B2
• Filed: 08/24/2018
• Issued: 03/03/2020
• Est. Priority Date: 11/10/2010
• Status: Active Grant

• Current Assignee: Velocity Holdings LLC (Centerpoint Energy Incorporated)
• Original Assignee: Velocity Holdings LLC (Centerpoint Energy Incorporated)
• Inventors: Burrow, Lonnie
• Primary Examiner(s): Bergin, James S
• Application Number:
  US16/111,673
• Publication Number:
  US 20190011236A1
• Time in Patent Office: 557 Days
• Field of Search: 102430, 102447, 102464-470, 86 10, 86 18, 86 195, 86 198, 86 23, 86 25, 86 31, 86 32, 86 54- 55
• CPC Class Codes: B22F 1/108 Mixtures obtained by warm mixing
• CPC Class Codes: B22F 2998/10 Processes characterised by the sequence of their steps
• CPC Class Codes: B22F 3/004 Filling molds with powder feeding material to presses in general B30B15/302
• CPC Class Codes: B22F 3/10 Sintering only
• CPC Class Codes: B22F 3/1021 Removal of binder or filler removal of binder from ceramics C04B35/638
• CPC Class Codes: B22F 3/1025 not by heating only
• CPC Class Codes: B22F 3/225 by injection molding
• CPC Class Codes: B22F 5/00 Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
• CPC Class Codes: B22F 5/06 of threaded articles, e.g. nuts
• CPC Class Codes: B22F 9/04 starting from solid material, e.g. by crushing, grinding or milling C22C1/1084 takes precedence; crushing, grinding or milling, in general, see the relevant subclasses, e.g. B02C
• CPC Class Codes: C04B 35/64 Burning or sintering processes C04B33/32 takes precedence ; powder metallurgy B22F
• CPC Class Codes: C22C 1/0458 Alloys based on titanium, zirconium or hafnium
• CPC Class Codes: C22C 14/00 Alloys based on titanium
• CPC Class Codes: C22C 33/0257 characterised by the range of the alloying elements
• CPC Class Codes: C22C 33/0285 with Cr, Co, or Ni having a minimum content higher than 5%
• CPC Class Codes: C22C 38/02 containing silicon
• CPC Class Codes: C22C 38/04 containing manganese
• CPC Class Codes: C22C 38/18 containing chromium
• CPC Class Codes: C22C 38/42 with copper
• CPC Class Codes: C22C 38/44 with molybdenum or tungsten
• CPC Class Codes: C22C 38/48 : with niobium or tantalum
• CPC Class Codes: C22C 38/58 : with more than 1.5% by weight of manganese
• CPC Class Codes: F42B 33/00 : 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 Class Codes: F42B 33/001 : Devices or processes for assembling ammunition, cartridges or cartridge elements from parts
• CPC Class Codes: F42B 33/02 : Filling cartridges, missiles, or fuzes; Inserting propellant or explosive charges F42B33/004 takes precedence
• CPC Class Codes: F42B 33/04 : Fitting or extracting primers in or from fuzes or charges F42B33/004 takes precedence
• CPC Class Codes: F42B 5/02 : Cartridges, i.e. cases with charge and missile
• CPC Class Codes: F42B 5/025 : characterised by the dimension of the case or the missile
• CPC Class Codes: F42B 5/30 : of plastics , i.e. the cartridge-case tube is of plastics
• CPC Class Codes: F42B 5/307 : formed by assembling several elements
• CPC Class Codes: F42B 5/313 : all elements made of plastics
• CPC Class Codes: F42C 19/0807 : 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 Class Codes: F42C 19/0823 : Primers or igniters for the initiation or the propellant charge in a cartridged ammunition primers for caseless ammunition F42C19/085
• CPC Class Codes: F42C 19/083 : characterised by the shape and configuration of the base element embedded in the cartridge bottom, e.g. the housing for the squib or percussion cap

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.

Claims

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.