Method of making a primer insert for use in polymer ammunition
First Claim
1. A method of making a metal primer insert for a polymeric ammunition cartridge comprising the steps of:
- providing an insert blank for machining;
machining a top surface on the insert blank;
machining a flange that extends circumferentially about an outer edge of the top surface;
machining an outer channel adjacent to the flange that extends circumferentially about the insert blank, wherein the outer channel is adapted to receive a polymer overmolding;
machining a substantially cylindrical coupling element that extends from the outer channel to a coupling tip, wherein the substantially cylindrical coupling element includes an inner coupling element surface that extends from the coupling tip to a bottom surface, wherein the bottom surface is opposite the top surface, wherein the substantially cylindrical coupling element is adapted to receive the polymer overmolding;
machining a primer recess in the top surface that extends toward the bottom surface;
machining a primer flash aperture in the primer recess through the bottom surface; and
machining a groove in the primer recess around the primer flash aperture adapted to receive the polymer overmolding.
3 Assignments
0 Petitions
Accused Products
Abstract
One embodiment of the present invention provides a polymeric ammunition cartridge and methods of making and using the same. The cartridge includes a substantially cylindrical insert connected to a substantially cylindrical polymeric middle body. The substantially cylindrical insert includes a top surface opposite a bottom surface and a substantially cylindrical 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 positioned in the primer recess to extend through the bottom surface, and a flange that extends circumferentially about an outer edge of the top surface. The substantially cylindrical polymeric middle body includes a substantially cylindrical polymeric bullet-end and a substantially cylindrical polymeric coupling end connected by a powder chamber, wherein the substantially cylindrical polymeric coupling end extends over the substantially cylindrical coupling element and covers a circumferential surface of the primer flash hole.
293 Citations
9 Claims
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1. A method of making a metal primer insert for a polymeric ammunition cartridge comprising the steps of:
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providing an insert blank for machining; machining a top surface on the insert blank; machining a flange that extends circumferentially about an outer edge of the top surface; machining an outer channel adjacent to the flange that extends circumferentially about the insert blank, wherein the outer channel is adapted to receive a polymer overmolding; machining a substantially cylindrical coupling element that extends from the outer channel to a coupling tip, wherein the substantially cylindrical coupling element includes an inner coupling element surface that extends from the coupling tip to a bottom surface, wherein the bottom surface is opposite the top surface, wherein the substantially cylindrical coupling element is adapted to receive the polymer overmolding; machining a primer recess in the top surface that extends toward the bottom surface; machining a primer flash aperture in the primer recess through the bottom surface; and machining a groove in the primer recess around the primer flash aperture adapted to receive the polymer overmolding. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification