Patent ID: 11933592
Assignee: SHELL SHOCK TECHNOLOGIES INC
Field: Other special machines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A casing for ammunition used in a firearm, the casing having a lengthwise centerline, a proximal end having a recess shaped for receiving a primer, and an opposing distal end comprising a mouth for receiving and holding a projectile, the casing comprising:
a sleeve portion, for holding a quantity of gunpowder, the sleeve portion having a distal end characterized by said mouth, and an opposing proximal end from which runs lengthwise a cylindrical exterior surface having an associated diameter;
a base, having a distal end characterized by a cylindrical portion that is securely mated with or integral with said proximal end of sleeve portion, a proximal end characterized by a flange having a first side annular flange surface that forms at least a portion of said casing proximal end and an opposing second side annular flange surface that faces toward the distal end, the base further characterized by a cannelure situated between the flange and the distal end of the base, the cannelure characterized by
a first cannelure surface portion that faces distally and comprises at least a portion of said second side annular flange surface;
a second cannelure surface portion that is either contiguous with said first cannelure surface portion or spaced apart therefrom by a groove, the second cannelure surface portion extending lengthwise as a step having a diameter which is less than the diameter of the flange;
a third cannelure surface portion, running inwardly from the second cannelure surface portion toward the casing centerline along a plane or a curve, and then extending lengthwise cylindrically or curvingly; and,
a fourth cannelure surface portion, running outwardly from the third cannelure surface portion and away from the casing lengthwise centerline, the surface portion having either a conical or curved shape.