Method of making polymer ammunition cartridge having a two-piece primer insert
First Claim
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1. A method of making polymer ammunition having a two-piece primer insert comprising by the steps of:
- providing a two piece primer insert comprising;
an upper primer insert portion connected to a lower primer insert portion, wherein the upper primer insert portion comprises an upper primer bottom surface and an upper primer top surface opposite the 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, wherein the lower primer insert portion comprises;
a lower primer top surface opposite a lower primer bottom 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 flash hole aperture through the lower primer bottom surface extending to the primer recess, wherein the lower flash hole aperture is larger than the upper primer aperture, andproviding an insert joint linking the upper primer top surface and the lower primer bottom surface and the insert joint aligning the upper primer aperture with the lower primer aperture to form the two-piece insert;
providing a first polymer composition for molding a polymer ammunition cartridge;
molding from the first polymer composition a substantially cylindrical polymeric middle body having the primer insert at a first end and a substantially cylindrical polymeric coupling region at a second end, wherein the first polymer composition extends over an outer surface of the primer insert to a flange that extends circumferentially about an outer edge of the lower primer top surface and the first polymer composition extends over an interior surface of the substantially cylindrical coupling region into the lower flash hole aperture to form a flash hole, wherein the first polymer composition extends from the substantially cylindrical polymeric coupling region into the lower flash hole aperture;
forming a substantially cylindrical polymeric bullet-end component from a second polymer composition comprising a bullet aperture opposite a polymeric bullet-end coupling that mates to the substantially cylindrical coupling region;
coupling the substantially cylindrical coupling region to the polymeric bullet-end coupling to form a propellant chamber that extends from the flash hole to the bullet aperture;
inserting a primer into the primer recess, wherein the primer is in operable communication with the propellant chamber through the flash hole;
at least partially filling the propellant chamber with a propellant; and
frictionally fitting a projectile in the bullet-end aperture, wherein the propellant chamber is enclosed at one end by the primer and the projectile at the other end.
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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.
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Citations
19 Claims
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1. A method of making polymer ammunition having a two-piece primer insert comprising by the steps of:
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providing a two piece primer insert comprising;
an upper primer insert portion connected to a lower primer insert portion, wherein the upper primer insert portion comprises an upper primer bottom surface and an upper primer top surface opposite the 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, wherein the lower primer insert portion comprises;
a lower primer top surface opposite a lower primer bottom 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 flash hole aperture through the lower primer bottom surface extending to the primer recess, wherein the lower flash hole aperture is larger than the upper primer aperture, andproviding an insert joint linking the upper primer top surface and the lower primer bottom surface and the insert joint aligning the upper primer aperture with the lower primer aperture to form the two-piece insert; providing a first polymer composition for molding a polymer ammunition cartridge; molding from the first polymer composition a substantially cylindrical polymeric middle body having the primer insert at a first end and a substantially cylindrical polymeric coupling region at a second end, wherein the first polymer composition extends over an outer surface of the primer insert to a flange that extends circumferentially about an outer edge of the lower primer top surface and the first polymer composition extends over an interior surface of the substantially cylindrical coupling region into the lower flash hole aperture to form a flash hole, wherein the first polymer composition extends from the substantially cylindrical polymeric coupling region into the lower flash hole aperture; forming a substantially cylindrical polymeric bullet-end component from a second polymer composition comprising a bullet aperture opposite a polymeric bullet-end coupling that mates to the substantially cylindrical coupling region; coupling the substantially cylindrical coupling region to the polymeric bullet-end coupling to form a propellant chamber that extends from the flash hole to the bullet aperture; inserting a primer into the primer recess, wherein the primer is in operable communication with the propellant chamber through the flash hole; at least partially filling the propellant chamber with a propellant; and frictionally fitting a projectile in the bullet-end aperture, wherein the propellant chamber is enclosed at one end by the primer and the projectile at the other end. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of making a polymer ammunition having a two-piece primer insert comprising by the steps of:
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forming a two-piece primer insert comprising the steps of; forming an upper primer insert portion comprising an upper primer bottom surface, an upper primer aperture through the upper primer bottom surface and an upper primer top surface opposite 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;forming 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, wherein the lower flash hole aperture is larger than the upper primer aperture; and
a flange that extends circumferentially about an outer edge of the lower primer top surface;aligning the upper primer top surface and the lower primer bottom surface to form an insert joint and to align the upper primer aperture with the lower primer aperture; linking the upper primer top surface and the lower primer bottom surface to form the two-piece primer insert; providing a first polymer composition for molding a polymer ammunition cartridge; molding from the first polymer composition a substantially cylindrical polymeric middle body having the primer insert at a first end and a substantially cylindrical polymeric coupling region at a second end, wherein the first polymer composition extends over an outer surface of the primer insert to the flange and extends over an interior surface of the substantially cylindrical coupling region into the lower flash hole aperture to form a flash hole, wherein the first polymer composition extends from the substantially cylindrical polymeric coupling region into the lower flash hole aperture; forming a substantially cylindrical polymeric bullet-end component from a second polymer composition comprising a bullet aperture opposite a polymeric bullet-end coupling that mates to the substantially cylindrical coupling region; coupling the substantially cylindrical coupling region to the polymeric bullet-end coupling to form a propellant chamber that extends from the flash hole to the bullet aperture; inserting the primer into the primer recess, wherein the primer is in operable communication with the propellant chamber through the flash hole; at least partially filling the propellant chamber with a propellant; and frictionally fitting a projectile in the bullet-end aperture, wherein the propellant chamber is enclosed at one end by the primer and the projectile at the other end. - View Dependent Claims (15, 16)
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17. A method of making polymer ammunition having a two-piece primer insert comprising by the steps of providing a two piece primer insert comprising:
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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, an upper primer top surface opposite the upper primer bottom surface, and an interior surface inside the substantially cylindrical coupling element; a lower primer insert portion comprising a lower primer top surface opposite a lower primer bottom 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 top surface; a flash hole groove that extends circumferentially about the lower primer aperture, wherein the flash hole groove is formed by the lower flash hole aperture being larger than the upper primer aperture; and an insert joint that links the upper primer top surface and the lower primer bottom surface to align the upper primer aperture and the lower primer aperture and form the two-piece primer insert; providing a first polymer composition for molding a polymer ammunition cartridge; molding from the first polymer composition a substantially cylindrical polymeric middle body having the primer insert at a first end and a substantially cylindrical polymeric coupling region at a second end, wherein the first polymer composition extends over an outer surface of the primer insert to the flange and extends over an interior surface of the substantially cylindrical coupling region into the flash hole groove forming a flash hole, wherein the first polymer composition extends from the substantially cylindrical polymeric coupling region into the flash hole groove; forming a substantially cylindrical polymeric bullet-end component from a second polymer composition comprising a bullet aperture opposite a polymeric bullet-end coupling that mates to the substantially cylindrical coupling region; coupling the substantially cylindrical coupling region to the polymeric bullet-end coupling to form a propellant chamber that extends from the flash hole to the bullet aperture; inserting the primer into the primer recess, wherein the primer is in operable communication with the propellant chamber through the flash hole; at least partially filling the propellant chamber with a propellant; and frictionally fitting a projectile in the bullet-end aperture, wherein the propellant chamber is enclosed at one end by the primer and the projectile at the other end. - View Dependent Claims (18, 19)
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Specification