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US 9,518,810 B1Granted
Polymer ammunition cartridge having a two-piece primer insert
AssigneeTrue Velocity, Inc.
InventorLonnie Burrow
Life of this patent
Estimating the term…
Abstract
The present invention provides ammunition cartridge having a two piece primer insert with a flange, a polymeric middle body extending from the primer insert to a cylindrical middle body coupling region, and a polymeric projectile end having a projectile aperture mated to the polymeric middle body.
Claims17
An ammunition cartridge having a two piece primer insert comprising:
- a two piece insert comprising:
- an upper primer insert portion comprising an upper primer bottom surface, an upper primer aperture through the upper primer bottom surface;
- a substantially cylindrical coupling element extending away from the upper primer bottom surface, and an interior surface inside the substantially cylindrical coupling element;
- 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 that extends toward the lower primer bottom surface and adapted to fit a primer, a lower primer aperture through the lower primer bottom surface, and a flange that extends circumferentially about an outer edge of the lower primer bottom surface, wherein the flange is adapted to receive a polymer overmolding;
- and an insert joint that links the upper primer bottom surface and the lower primer bottom surface to align the lower primer aperture with the upper primer aperture and form a primer insert;
- a primer flash aperture extending through the lower primer aperture and the upper primer aperture;
- a substantially cylindrical polymeric middle body extending from the substantially cylindrical primer insert to a cylindrical middle body coupling region molded from a first polymer composition, wherein the first polymer composition is molded over the flange, the interior surface of the substantially cylindrical coupling element and an outer surface of the upper primer insert and extends to the cylindrical middle body coupling region;
- a substantially cylindrical polymeric projectile end mated to the substantially cylindrical polymeric middle body, wherein the substantially cylindrical polymeric projectile end comprises a projectile end coupling region that extends to a shoulder region that reduces to a neck region having a projectile aperture wherein the projectile end coupling region couples to the middle body coupling region;
- and
- a propellant chamber defined between the primer flash aperture and the projectile aperture;
- and
- a primer flash aperture groove positioned in the primer recess around the primer flash aperture and the first polymer composition extends into the primer flash aperture to form a flash hole.
9 more elements
An ammunition cartridge having a two piece primer insert comprising:
- a two piece insert comprising:
- an upper primer insert portion comprising an upper primer bottom surface, an upper primer aperture through the upper primer bottom surface;
- a substantially cylindrical coupling element extending away from the upper primer bottom surface, and an interior surface inside the substantially cylindrical coupling element;
- a lower primer insert portion comprising a lower primer bottom surface opposite a lower primer top surface, a flash hole groove that extends circumferentially about the upper primer aperture or the lower primer aperture, a primer recess in the lower primer top surface that extends toward the lower primer bottom surface and adapted to fit a primer, a lower primer aperture through the lower primer bottom surface, and a flange that extends circumferentially about an outer edge of the lower primer bottom surface, wherein the flange is adapted to receive a polymer overmolding of a first polymer composition, a primer flash aperture extending through the lower primer aperture and the upper primer aperture, and the first polymer composition extends into the primer flash aperture to form a flash hole;
- and
- an insert joint that links the upper primer bottom surface and the lower primer bottom surface to align the lower primer aperture with the upper primer aperture and form a primer insert;
- a substantially cylindrical polymeric middle body extending from the substantially cylindrical primer insert to a cylindrical middle body coupling region molded from a first polymer, wherein the first polymer is molded over the flange, the interior surface of the substantially cylindrical coupling element and an outer surface of the upper primer insert and extends to the cylindrical middle body coupling region;
- a substantially cylindrical polymeric projectile end mated to the substantially cylindrical polymeric middle body, wherein the substantially cylindrical polymeric projectile end comprises a projectile end coupling region that extends to a shoulder region that reduces to a neck region having a projectile aperture wherein the projectile end coupling region couples to the middle body coupling region;
- and
- a propellant chamber defined between the primer flash aperture and the projectile aperture.
7 more elements
Dependencies are inferred from the claim text.