Two-piece primer insert for polymer ammunition

Patent metadata

Field	Value
Publication number	US-9835427-B2
Application number	US-201615064807-A
Country	US
Kind code	B2
Filing date	Mar 9, 2016
Priority date	Mar 9, 2016
Publication date	Dec 5, 2017
Grant date	Dec 5, 2017

Abstract

The present invention provides a multi piece primer insert for ammunition comprising: an upper primer insert portion comprising an upper primer aperture through an upper primer bottom surface; a substantially cylindrical coupling element extending away from the upper primer bottom surface, and an interior surface; a lower primer insert portion comprising a lower primer bottom surface opposite a lower primer top surface, a primer recess in the lower primer top surface adapted to fit a primer, a lower primer aperture through the lower primer bottom surface, and a flange that adapted to receive a polymer overmolding extends circumferentially about an outer edge of the lower primer top surface; and an insert joint that links the upper primer bottom surface and the lower primer bottom surface to form a primer insert.

First claim

What is claimed is:

1. A two piece primer insert for ammunition comprising:
an upper primer insert portion comprising:
an upper primer bottom surface opposite an upper primer top surface,
a substantially cylindrical coupling element extending away from the upper primer bottom surface,
a primer flash aperture penetrating the upper primer bottom surface, and
a primer flash aperture groove positioned in the upper primer top surface around the primer flash aperture configured to receive a polymer overmolding through the primer flash aperture;
a lower primer insert portion comprising:
a lower primer bottom surface opposite a lower primer top surface, and
a primer recess in the lower primer top surface that extends toward the lower primer bottom surface and adapted to fit a primer, and
an insert joint that links the upper primer top surface and the lower primer bottom surface to align the primer flash aperture and the primer recess to form a primer insert.

2. The two piece primer insert of claim 1 , wherein the insert joint is threaded, riveted, locked, friction fitted, coined, snap fitted, chemical bonded, chemical welded, soldered, smelted, sintered, adhesive bonded, laser welded, ultrasonic welded, friction spot welded, or friction stir welded.

3. The two piece primer insert of claim 1 , wherein the upper primer insert portion, the lower primer insert portion or both are formed independently by metal injection molding, polymer injection molding, stamping, milling, molding, machining, punching, fine blanking, smelting, or any other method that will form insert portions that may be joined together to form a primer insert.

4. The two piece primer insert of claim 1 , wherein the upper primer insert portion, the lower primer insert portion or both independently comprises a polymer, a metal, an alloy, or a ceramic alloy.

5. The two piece primer insert of claim 4 , wherein the upper primer insert portion and the lower primer insert portion comprise of the same material or different materials.

6. The two piece primer insert of claim 1 , wherein the upper primer insert portion and the lower primer insert portion comprise different polymers, different metals, different alloys, or different ceramic compositions.

7. The two piece primer insert of claim 1 , wherein the upper primer insert portion comprises a polymer, a metal, an alloy, or a ceramic alloy and the lower primer insert portion comprises different polymer, metal, alloy, or ceramic alloy.

8. The two piece primer insert of claim 1 , wherein the upper primer insert portion and the lower primer insert portion independently comprise steel, nickel, chromium, copper, carbon, iron, stainless steel or brass.

9. The two piece primer insert of claim 1 , wherein the upper primer insert portion comprises 102, 174, 201, 202, 300, 302, 303, 304, 308, 309, 316, 316L, 316Ti, 321, 405, 408, 409, 410, 415, 416, 416R, 420, 430, 439, 440, 446 or 601-665 grade stainless steel or Ti6Al4V and the lower primer insert portion comprises 102, 174, 201, 202, 300, 302, 303, 304, 308, 309, 316, 316L, 316Ti, 321, 405, 408, 409, 410, 415, 416, 416R, 420, 430, 439, 440, 446 or 601-665 grade stainless steel or Ti6Al4V.

10. The two piece primer insert of claim 1 , further comprising the primer flash aperture groove extends circumferentially about the primer flash aperture.

11. The two piece primer insert of claim 1 , wherein the upper primer insert portion and the lower primer insert portion independently comprises:
(a) 2-16% Ni; 10-20% Cr; 0-5% Mo; 0-0.6% C; 0-6.0% Cu; 0-0.5% Nb+Ta; 0-4.0% Mn; 0-2.0% Si and the balance Fe;
(b) 2-6% Ni; 13.5-19.5% Cr; 0-0.10% C; 1-7.0% Cu; 0.05-0.65% Nb+Ta; 0-3.0% Mn; 0-3.0% Si and the balance Fe;
(c) 3-5% Ni; 15.5-17.5% Cr; 0-0.07% C; 3-5.0% Cu; 0.15-0.45% Nb+Ta; 0-1.0% Mn; 0-1.0% Si and the balance Fe;
(d) 10-14% Ni; 16-18% Cr; 2-3% Mo; 0-0.03% C; 0-2% Mn; 0-1% Si and the balance Fe;
(e) 12-14% Cr; 0.15-0.4% C; 0-1% Mn; 0-1% Si and the balance Fe;
(f) 16-18% Cr; 0-0.05% C; 0-1% Mn; 0-1% Si and the balance Fe;
(g) 3-12% aluminum, 2-8% vanadium, 0.1-0.75% iron, 0.1-0.5% oxygen, and the remainder titanium; or
(h) 6% aluminum, about 4% vanadium, about 0.25% iron, about 0.2% oxygen, and the remainder titanium.

Assignees

• True Velocity Inc

Inventors

• Burrow Lonnie

Classifications

• F42B5/313

  all elements made of plastics · CPC title

• F42C19/083 Primary

  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 · CPC title

• F42B5/30

  of plastics {, i.e. the cartridge-case tube is of plastics} · CPC title

• F42B5/307 Primary

  formed by assembling several elements · CPC title