US12442625 - Cartridge case and tool for joining the base piece and case jacket of a multi-part cartridge case

The patent describes a multi-part cartridge case that features a conically shaped annular wall on the base piece, which engages a retaining section of the case jacket to securely fasten the two components together. This design prevents any separation between the base piece and the case jacket along the axis of rotation, utilizing plastic deformation for assembly.

Claim 1

1. A cartridge case for ammunition, comprising: a rotationally-shaped case jacket configured to receive a projectile, the case jacket having a retaining section; and an annular base piece configured to receive a primer and the case jacket, the annular base piece having an annular wall adjacent to the case jacket being conically shaped at least in sections with respect to an axis of rotation of the annular base piece, wherein the retaining section is configured to engage the base piece on a side of the base piece and adapt in shape thereto so that the retaining section engages, at least in sections, behind the annular wall to fasten the case jacket and the base piece to each other and prevent a distancing of the base piece and the case jacket from each other in a direction of the axis of rotation of the annular base piece, the base piece being configured to plastically deform to form the conically-shaped annular wall and the retaining section. a rotationally-shaped case jacket configured to receive a projectile, the case jacket having a retaining section; and an annular base piece configured to receive a primer and the case jacket, the annular base piece having an annular wall adjacent to the case jacket being conically shaped at least in sections with respect to an axis of rotation of the annular base piece, wherein the retaining section is configured to engage the base piece on a side of the base piece and adapt in shape thereto so that the retaining section engages, at least in sections, behind the annular wall to fasten the case jacket and the base piece to each other and prevent a distancing of the base piece and the case jacket from each other in a direction of the axis of rotation of the annular base piece, the base piece being configured to plastically deform to form the conically-shaped annular wall and the retaining section.

Google Patents

https://patents.google.com/patent/US12442625

USPTO PDF

https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/12442625