Low energy mechanical operating cartridge

摘要

A low energy mechanical operating cartridge has an inner regulator core (13) supporting a projectile (21) slidably engaged in a primer casing (19). The regulator core acts to control the velocity at which the projectile is propelled from a firearm (61), and the primer casing carries the explosive propellant (25) necessary to generate the required energy to launch the projectile. To improve the operation of the cartridge and ejection of the cartridge from the firearm, the primer casing is configured to efficiently slide on the regulator core in a rearward recoil action, while robust gas seals are maintained between the casing and regulator core.

主权项

1. A low energy mechanical operating cartridge comprising:
a casing having a closed casing head, cylindrical casing walls, an open casing mouth, and a circumferential intermediate crimp located between said casing head and said casing mouth, said casing mouth having a casing mouth diameter and a forward-facing mouth end stop face, said casing walls defining a core-receiving chamber, said intermediate crimp having a crimp diameter smaller than said casing mouth diameter, and said crimp forming a forward-facing crimp stop face, said mouth end stop face having a diameter greater than that of said crimp stop face, and a regulator core having a base end, sidewalls, and a projectile end for receiving a projectile, said regulator core slidingly received in the core-receiving chamber of said casing, said base end in sealing engagement with the casing walls of said casing, said projectile end in sliding engagement with the casing mouth of said casing, the projectile end of said regulator core including dual, stepped, rearward-facing stop walls for abutment with said mouth end and crimp stop faces when said regulator core is received in said chamber, and said sidewalls including a travel channel extending between and having a diameter smaller than those of said base and projectile ends, said intermediate crimp engaging the sidewalls of the regulator core along said travel channel and movable therein between said base and projectile ends thereby limiting travel of the casing over the regulator core when the casing recoils on the regulator core upon detonation of a primer in the casing head.