| 摘要 |
A high strength polymer-based cartridge casing comprising: a cartridge body, molded from a polymer, comprising: a first end having a mouth; a second end opposite the first end; an outer sheath disposed proximate the second end; a lower bowl disposed proximate the outer sheath and having a hole therethrough; an insert of metal or metal alloy, comprising a front end and a back end, and further comprising: a rim disposed at the back end; a primer pocket disposed at and open along a portion of the back end and continuing partially toward the front end; a flash hole disposed forward of the primer pocket, in fluid communication with the primer pocket; and an overmolded area formed at the front end, opposite the rim, comprising: a basin formed on an inside of the overmolded area and disposed above the primer pocket; and a ring formed, at a bottom of the basin , on an inside of the overmolded area, and surrounding the flash hole, comprising a ring wall; wherein the ring prevents polymer from the lower bowl from flowing into the flash hole by stopping the polymer at the ring wall; wherein the second end of the cartridge body engages with the front end of the insert; wherein the outer sheath is disposed to an outside of the overmolded area; wherein the lower bowl is disposed inside of the overmolded area and in contact with the basin; and wherein the hole in the lower bowl is disposed around the ring wall. |
