Neck polymeric ammunition casing geometry
First Claim
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1. A polymeric ammunition casing comprising:
- a cylindrical hollow body defining an internal cavity formed at least partially of a polymeric material, the cylindrical hollow body further defining a longitudinal axis and having a primer end and a projectile end, wherein the body is formed of a body portion proximal to the primer end and a neck portion proximal to the projectile end, and wherein the diameter of the cylindrical hollow body tapers such that the diameter of the body portion is larger than the diameter of the neck portion; and
wherein the longitudinal length of the neck portion of the polymeric ammunition casing is extended such that the overall length of the casing body is at least 0.003 inches greater than a maximum longitudinal length standard for an ammunition casing of identical caliber as set by at least one ammunition standards organization selected from the group consisting of the Sporting Arms and Ammunition Manufacturers'"'"' Institute and the Commission Internationale Permanente pour l'"'"'é
preuve des armes à
feu portatives.
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Abstract
Ammunition casings that have optimal external cartridge dimensions for polymeric cases are provided. Polymeric ammunition cartridges and casings are presented having a neck portion of the polymeric case dimensioned for optimal fit within a firearm chamber. The polymeric ammunition casing may include one or both of an extended neck region and an internal cannelure engaging portion.
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Citations
15 Claims
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1. A polymeric ammunition casing comprising:
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a cylindrical hollow body defining an internal cavity formed at least partially of a polymeric material, the cylindrical hollow body further defining a longitudinal axis and having a primer end and a projectile end, wherein the body is formed of a body portion proximal to the primer end and a neck portion proximal to the projectile end, and wherein the diameter of the cylindrical hollow body tapers such that the diameter of the body portion is larger than the diameter of the neck portion; and wherein the longitudinal length of the neck portion of the polymeric ammunition casing is extended such that the overall length of the casing body is at least 0.003 inches greater than a maximum longitudinal length standard for an ammunition casing of identical caliber as set by at least one ammunition standards organization selected from the group consisting of the Sporting Arms and Ammunition Manufacturers'"'"' Institute and the Commission Internationale Permanente pour l'"'"'é
preuve des armes à
feu portatives. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A polymeric ammunition casing comprising:
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a cylindrical hollow body defining an internal cavity formed at least partially of a polymeric material, the cylindrical hollow body further defining a longitudinal axis and having a primer end and a projectile end, wherein the body is formed of a body portion proximal to the primer end and a neck portion proximal to the projectile end, and wherein the diameter of the cylindrical hollow body tapers such that the diameter of the body portion is larger than the diameter of the neck portion; wherein the longitudinal length of the neck portion of the polymeric ammunition casing is extended such that the overall length of the casing body is at least 0.003 inches greater than a maximum longitudinal length standard for an ammunition casing of identical caliber as set by at least one ammunition standards organization selected from the group consisting of the Sporting Arms and Ammunition Manufacturers'"'"' Institute and the Commission Internationale Permanente pour l'"'"'é
preuve des armes à
feu portatives; andfurther comprising a cylindrical strip of a polymeric material disposed within the internal cavity of the ammunition casing along at least the portion of the neck portion of said ammunition casing that engages the cannelure of a projectile. - View Dependent Claims (12, 13, 14, 15)
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Specification