Multi-projectile ammunition and method of making
AssigneeSig Sauer, Inc.
InventorsJason W. Imhoff, Thomas J. Burczynski, Timothy G. Janzen
Life of this patent
Estimating the term…
Abstract
A multi-projectile ammunition cartridge has a casing that extends along a central axis to a mouth, the casing having an internal surface and an external surface. An inside surface of the casing adjacent the mouth is parallel to the central axis while the external surface has a slight taper relative to the central axis. Two or more coaxially aligned projectiles are retained within the parallel portion of the casing adjacent the mouth, each projectile having a tapered nose and a rear cavity, where a nose profile of a rearward one of the projectiles differs from the a cavity profile of a forward adjacent one of the projectiles.
Claims20
A multi-projectile ammunition cartridge, comprising:
- a casing symmetrical about a central axis and extending along the central axis to a mouth, the casing having an internal surface and an external surface, wherein along a portion of the casing adjacent the mouth the internal surface is parallel to the central axis within 0.002 inch per inch of length, and where the external surface has a taper relative to the central axis;
- and
- two or more coaxially aligned projectiles retained within the portion of the casing adjacent the mouth, each projectile having a tapered nose profile and a rear concavity profile, wherein the tapered nose profile of a rearward one of the two or more projectiles differs from the rear concavity profile of a forward adjacent one of the two or more projectiles.
A method of manufacturing a cartridge case, comprising:
- forming a metallic cylinder that extends along a central axis from a closed end with a primer pocket to an open end;
- defining an extractor groove in the cylinder adjacent the closed end;
- defining a flash opening in the primer pocket, the flash opening aligned with the central axis;
- forming an exterior taper on an outer surface of the cartridge case;
- and
- shaping part of the inside surface of the cylinder adjacent the open end to be parallel to the central axis within an error of not more than 0.002” per inch of length, the part of the inside surface that is parallel having an axial length of at least 1.5 times an interior diameter of the open end.
Dependencies are inferred from the claim text.