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 (32) comprising;
an upper primer insert portion (56) connected to a lower primer insert portion (58), wherein the upper primer insert portion (56) comprises an upper primer bottom surface (34), an upper primer aperture (33) through the upper primer bottom surface (34), and a substantially cylindrical coupling element (30) extending away from the upper primer bottom surface (34), wherein the lower primer insert portion (58) comprises;
a lower primer bottom surface (35) opposite a lower primer top surface (36), a primer recess (38) in the lower primer top surface (36) that extends toward the lower primer bottom surface (35) and adapted to fit a primer, a lower flash hole aperture (37) through the lower primer bottom surface (35), wherein the lower flash hole aperture (37) is larger than the upper primer aperture (33) to form a flash hole groove (39) in the primer recess (38);
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 to the primer flash hole aperture, wherein the first polymer composition extends from the substantially cylindrical polymeric coupling region to the primer 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 primer flash hole aperture to the bullet aperture;
inserting a primer into the primer recess, wherein the primer is in operably communication with the propellant chamber through the primer flash hole aperture;
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
20 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 (32) comprising;
an upper primer insert portion (56) connected to a lower primer insert portion (58), wherein the upper primer insert portion (56) comprises an upper primer bottom surface (34), an upper primer aperture (33) through the upper primer bottom surface (34), and a substantially cylindrical coupling element (30) extending away from the upper primer bottom surface (34), wherein the lower primer insert portion (58) comprises;
a lower primer bottom surface (35) opposite a lower primer top surface (36), a primer recess (38) in the lower primer top surface (36) that extends toward the lower primer bottom surface (35) and adapted to fit a primer, a lower flash hole aperture (37) through the lower primer bottom surface (35), wherein the lower flash hole aperture (37) is larger than the upper primer aperture (33) to form a flash hole groove (39) in the primer recess (38);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 to the primer flash hole aperture, wherein the first polymer composition extends from the substantially cylindrical polymeric coupling region to the primer 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 primer flash hole aperture to the bullet aperture; inserting a primer into the primer recess, wherein the primer is in operably communication with the propellant chamber through the primer flash hole aperture; 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, 14)
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15. 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;
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, and a flange that extends circumferentially about an outer edge of the lower primer top surface, wherein the flange is adapted to receive a polymer overmolding; aligning the upper primer bottom surface and the lower primer bottom surface to align the lower primer aperture to form an insert joint; linking the upper primer bottom surface and the lower primer bottom surface to form a 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 to the primer flash hole aperture, wherein the first polymer composition extends from the substantially cylindrical polymeric coupling region to the primer 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 primer flash hole aperture to the bullet aperture; inserting a primer into the primer recess, wherein the primer is in operably communication with the propellant chamber through the primer flash hole aperture; 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 (16, 17)
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18. 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 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 top surface, wherein the flange is adapted to receive a polymer overmolding;
a flash hole groove that extends circumferentially about the upper primer aperture or that extends circumferentially about the lower primer aperture; and
an insert joint that links the upper primer bottom surface and the lower primer bottom surface to align the lower primer aperture and form a 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 to the primer flash hole aperture, wherein the first polymer composition extends from the substantially cylindrical polymeric coupling region to the primer 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 primer flash hole aperture to the bullet aperture; inserting a primer into the primer recess, wherein the primer is in operably communication with the propellant chamber through the primer flash hole aperture; 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 (19, 20)
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Specification