Base Insert for Polymer Ammunition Cartridges
First Claim
1. An insert for a high strength polymer-based cartridge casing comprising:
- an outside;
an inside formed within the insert;
a back end disposed at a rear of the cartridge casing, comprising;
a rim and groove disposed around the outside of the insert; and
a primer pocket disposed inside the back end;
a front end, opposite the back end, comprising;
an overmolded area disposed around the outside of the insert above the primer pocket; and
a basin, having a depth, formed inside the overmolded area;
a flash hole, inside the insert and communicating between the primer pocket and basin, comprising a perimeter; and
a ring disposed around the perimeter of the flash hole, comprising a height starting at a bottom of the basin, disposed toward the front end, and less than the depth of the basin.
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Accused Products
Abstract
An insert for a high strength polymer-based cartridge casing can include an outside, an inside formed within the insert, and a back end disposed at a rear of the cartridge casing. The back end includes a rim and groove disposed around the outside of the insert and a primer pocket disposed inside the back end. Also included is a front end, opposite the back end, having an overmolded area disposed around the outside of the insert above the primer pocket and a basin, having a depth, formed inside the overmolded area. A flash hole can be included inside the insert and communicating between the primer pocket and the basin. The flash hole has a perimeter and a ring disposed around the perimeter of the flash hole, including a height starting at a bottom of the basin, disposed toward the front end, and less than the depth of the basin.
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Citations
13 Claims
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1. An insert for a high strength polymer-based cartridge casing comprising:
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an outside; an inside formed within the insert; a back end disposed at a rear of the cartridge casing, comprising; a rim and groove disposed around the outside of the insert; and a primer pocket disposed inside the back end; a front end, opposite the back end, comprising; an overmolded area disposed around the outside of the insert above the primer pocket; and a basin, having a depth, formed inside the overmolded area; a flash hole, inside the insert and communicating between the primer pocket and basin, comprising a perimeter; and a ring disposed around the perimeter of the flash hole, comprising a height starting at a bottom of the basin, disposed toward the front end, and less than the depth of the basin. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A high strength polymer-based cartridge casing comprising:
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an upper component, molded from a polymer, comprising; a first end having a mouth; at least a wall between the first end and a second end of the upper component opposite the first end; and an overlap portion extending from the wall near the second end; a lower component, molded from a polymer, comprising; a tapered portion that engages the overlap portion to join the upper and the lower components; an outer sheath disposed opposite the tapered portion; and a lower bowl disposed between the tapered portion and the outer sheath having a hole therethrough; an insert comprising; a rim disposed at one end of the insert; an overmolded area formed opposite the rim and engaging the outer sheath to join the insert to the lower component, and a ring formed on an inside of the overmolded area and extending into the hole of the lower component. - View Dependent Claims (10, 11)
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12. A method of making a high strength polymer-based cartridge casing comprising the steps of:
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machining an insert having a primer pocket, a flash hole, a ring, and an overmolded area; and molding a lower component using a polymer comprising the steps of; molding the polymer over the overmolded area of the insert; and stopping the polymer at the ring. - View Dependent Claims (13)
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Specification