US12498204 - Firearm cartridge with roll and tapered crimps and related methods for assembly

The patent describes a firearm cartridge featuring a unique crimping design at the open end, which alternates between discrete roll and tapered crimps to secure the projectile. This configuration aims to enhance the integrity and performance of the cartridge by effectively holding the components in place.

Claim 1

1 . A cartridge for a firearm, comprising: a projectile; a gas check; a case; a propellant; and a primer configured to ignite the propellant, wherein the propellant is arranged between the gas check and an end surface of the case in which the primer is arranged, wherein the case is crimped against the projectile, wherein the case includes an open end with discrete roll crimps distributed along a circumference of the open end, wherein the case further includes tapered crimps between the roll crimps along the circumference of the open end, and wherein the open end alternates between tapered and roll crimps along the entire circumference of the open end, and wherein each of the roll crimps and tapered crimps are crimped to the projectile. a projectile; a gas check; a case; a propellant; and a primer configured to ignite the propellant, wherein the propellant is arranged between the gas check and an end surface of the case in which the primer is arranged, wherein the case is crimped against the projectile, wherein the case includes an open end with discrete roll crimps distributed along a circumference of the open end, wherein the case further includes tapered crimps between the roll crimps along the circumference of the open end, and wherein the open end alternates between tapered and roll crimps along the entire circumference of the open end, and wherein each of the roll crimps and tapered crimps are crimped to the projectile.

Google Patents

https://patents.google.com/patent/US12498204

USPTO PDF

https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/12498204