Multi-piece primer insert for polymer ammunition
AssigneeTrue Velocity IP Holdings, LLC
InventorsLonnie Burrow, Christopher William Overton, Florian Herzog, Nimmy Mammoottil, Andrew Rosek
Life of this patent
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Abstract
The present invention provides a two piece and a three piece primer insert for ammunition piece. Each of the individual pieces may be formed by punching, pressing, stamping, molding, milling, coining, or by additive manufacturing. The individual pieces may be joined by clinching, pressing welding soldering, sintering, adhesive gluing, staking, and iterative addition by forming one piece into another piece.
Claims12
A multi-piece metallic primer insert engaged to a polymer ammunition cartridge to define a base end, the ammunition cartridge having a cartridge body opening into a projectile aperture at a forward end and an opposite end molded over an internal surface of the primer insert to define a propellant chamber in the cartridge body, the primer insert comprising:
- a first, upper insert having a coupling element extending forward from a lower surface forming at least a portion of the internal surface, and an annular lower leg extending from the lower surface to partially enclose a second, lower insert;
- the second, lower insert having an upper surface forming a remaining portion of the internal surface for overmolding, a primer recess formed in the lower insert and fluidically connected to the propellant chamber through a flash hole defined through the upper surface, wherein an extraction flange extends outward from a sidewall forming the primer recess;
- and
- an insert joint joining the upper insert to the lower insert, the insert joint defined between the lower leg of the upper insert and an outer surface of the sidewall of the lower insert.
A multi-piece metallic primer insert configured for engagement with a polymer ammunition cartridge, the primer insert comprising:
- a first, upper insert having a coupling element extending forward from a lower surface forming at least a portion of an overmolded surface when the primer insert is engaged to the polymer ammunition cartridge, and an annular lower leg extending from the lower surface to partially enclose a second, lower insert;
- the lower insert having an upper surface forming a remaining portion of the overmolded surface when the primer insert is engaged to the polymer ammunition cartridge, a primer recess formed in the lower insert, a flash hole formed through the upper surface and in fluid communication with the primer recess;
- a third insert enclosing the lower leg and forming an extraction flange extending away from the lower insert;
- and
- an insert joint joining the upper insert to the lower insert, the insert joint defined between the lower leg of the upper insert and an outer surface of the lower insert.
Dependencies are inferred from the claim text.