Patent ID: 7225741
Filing Date: 2007-06-05
Classification: F42B

Abstract:
1. A two-piece, two-stage, reduced energy mechanically-operating cartridge for launching a projectile from a dedicated or modified firearm, comprising: (a) a piston sleeve comprising a piston sleeve jacket defining a projectile cavity at a first longitudinal end for coupling the projectile therein, and a second end for coupling with a primary case, and the piston sleeve including one or more partially annular protrusion portions (hereinafter “cogs”); and (b) the primary case comprising a primary case jacket for being axially coupled with the second end of the piston sleeve, and including one or more complementary partially annular cogs to those of the piston sleeve, and defining a primary case cavity for coupling with a propellant mechanism, and (c) wherein said primary case and piston sleeve are configured such that an axial coupling of the primary case with the second end of the piston sleeve involves the respective cogs of the primary case and piston sleeve being initially offset, and (d) wherein said primary case and piston sleeve are further configured such that upon the axial coupling of the piston sleeve and primary case and at least partial compression together, the primary case and the piston sleeve become relatively rotationally movable to angularly overlap their respective cogs, the angular overlap being present when the sleeve and primary case are set into an at least partially compressed position, such that upon activation, when the piston sleeve and primary case telescope from the static position, the respective cogs meet at a particular longitudinal extent of the cartridge.