One piece polymer ammunition cartridge having a primer insert and methods of making the same
First Claim
Patent Images
1. A polymeric ammunition cartridge made by the process of:
- providing a polymer ammunition cartridge blank comprising an unformed top end connected to a cartridge bottom by a polymer middle body to form a propellant chamber, wherein the unformed top end comprises a nose end aperture, wherein the cartridge bottom comprises a primer insert comprising a top surface opposite a bottom surface and a coupling element that extends from the bottom surface, a primer recess in the top surface that extends toward the bottom surface, a primer flash hole aperture positioned in the primer recess to extend through the bottom surface and a groove in the primer recess positioned around the flash hole aperture, wherein the middle body is overmolded through the primer flash hole aperture into the groove;
providing a thermal form comprising a body segment extending to a shoulder segment that transitions to a neck segment that terminates at a tip segment end and a mandrel extendable into the neck segment at the tip segment end;
heating the thermal form;
inserting the unformed top end into the thermal form;
extending the mandrel into the nose end aperture;
contacting the unformed top end with the tip segment end to form a polymer ammunition cartridge having a shoulder connected to a neck, wherein the nose end aperture forms a projectile aperture; and
removing the polymer ammunition cartridge from the thermal form.
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Abstract
The present invention provides a single piece polymer ammunition cartridge and polymer ammunition and methods of forming a single piece polymer ammunition cartridge and polymer ammunition.
280 Citations
13 Claims
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1. A polymeric ammunition cartridge made by the process of:
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providing a polymer ammunition cartridge blank comprising an unformed top end connected to a cartridge bottom by a polymer middle body to form a propellant chamber, wherein the unformed top end comprises a nose end aperture, wherein the cartridge bottom comprises a primer insert comprising a top surface opposite a bottom surface and a coupling element that extends from the bottom surface, a primer recess in the top surface that extends toward the bottom surface, a primer flash hole aperture positioned in the primer recess to extend through the bottom surface and a groove in the primer recess positioned around the flash hole aperture, wherein the middle body is overmolded through the primer flash hole aperture into the groove; providing a thermal form comprising a body segment extending to a shoulder segment that transitions to a neck segment that terminates at a tip segment end and a mandrel extendable into the neck segment at the tip segment end; heating the thermal form; inserting the unformed top end into the thermal form; extending the mandrel into the nose end aperture; contacting the unformed top end with the tip segment end to form a polymer ammunition cartridge having a shoulder connected to a neck, wherein the nose end aperture forms a projectile aperture; and removing the polymer ammunition cartridge from the thermal form. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification