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1、1 2公开号: US8443730B2专利名称：HIGH STRENGTH POLYMER-BASED CARTRIDGE CASING AND MANUFACTURING METHOD公开日: May 21,2013国际分类: F42B 5/SO (2006.01)申请号: 13/350,607申请日: Jan. 13, 2012发明人：Charles Padgett, Orlando, FL (US)申请人：PCP Tactical, LLC, Vero Beach, FL (US)优先权号：US 2012/0180688 A1 Jul. 19, 2012同族专利：发明摘要：A high
2、strength polymer-based cartridge casing can include a first end having a mouth and a neck extending away from the mouth. Next, a shoulder extends below the neck and away from the first end. The cartridge can be have a frangible portion capable of being split upon discharge of a projectile. The shoul
3、der can have unequal outside and inside shoulder angles. The casing can also include an insert having a rim at one end or a plurality of ribs extending longitudinally along a wall between the shoulder and the bottom of the cartridge and spaced radially from each other around a circumference of the w
4、all. A projectile canbe disposed in the mouth and a relief can be disposed on the neck near the mouth and projectile. The relief can form a gap between the neck and the projectile to receive an adhesive.发明领域（关键词）:The present subject matter relates to ammunition articles with plastic components such
5、as cartridge casing bodies, and, more particularly, to making ammunition articles with ribs, a variable width shoulder, an insert, and frangible neck.US 8,443,730 B23发明背景：It is well known in the industry to manufacture cartridge cases from either brass or steel. Typically, industry design calls for
6、materials that are strong enough to withstand extreme operating pressures and which can be formed into a cartridge case to hold the bullet, while simultaneously resist rupturing during the firing process.Conventional ammunition typically includes four basic components, that is, the bullet, the cartr
7、idge case holding the bullet therein, a propellant used to push the bullet down the barrel at predetermined velocities, and a primer, which provides the spark needed to ignite the powder which sets the bullet in motion down the barrel.The cartridge case is typically formed from brass and is configur
8、ed to hold the bullet therein to create a predetermined resistance, which is known in the industry as bullet pull. The cartridge case is also designed to contain the propellant media as well as the primer.However, brass is heavy, expensive, and potentially hazardous. For example, the weight of .50 c
9、aliber ammunition is about 60 pounds per box (200 cartridges plus links).The bullet is configured to fit within an open end or mouth of the cartridge case. Certain bullets, mainly for non-military uses, can include a groove (hereinafter referred to as a cannelure) formed in the mid section of the bu
10、llet to accept a crimping action imparted to the metallic cartridge case therein. When the crimped portion of the cartridge case holds the bullet by locking into the cannelure or onto the diameter, a bullet pull value is provided representing a predetermined tension at which the cartridge case holds
11、 the bullet. The bullet pull value, in effect, assists imparting a regulated pressure and velocity to the bullet when the bullet leaves the cartridge case and travels down the barrel of a gun.Furthermore, the bullet is typically manufactured from a soft material, US 8,443,730 B24such as, for example
12、 only, lead. The bullet is accepted into the mouth of the cartridge, and then the cartridge alone is crimped to any portion of the bullet to hold the bullet in place in the cartridge case. Though, typically, the cartridge case is crimped to the cannelure of the bullet.However, one drawback of this d
13、esign is that the crimped neck does not release from around the bullet evenly when fired. This is partly due to the fact that the brass casing is not manufactured perfectly. The material thickness around the neck is slightly different causing the case to deform at slightly different rates thus allow
14、ing the bullet to be pushed slightly off center when coming out. This leads to uncertain performance from round to round. Pressures can build up unevenly and alter the accuracy of the bullet.The propellant is typically a solid chemical compound in powder form commonly referred to as smokeless powder
15、. Propellants are selected such that when confined within the cartridge case, the propellant bums at a known and predictably rapid rate to produce the desired expanding gases. As discussed above, the expanding gases of the propellant pro-vide the energy force that launches the bullet from the grasp
16、of the cartridge case and propels the bullet down the barrel of the gun at a known and relatively high velocity.The primer is the smallest of the four basic components used to form conventional ammunition. As discussed above, primers provide the spark needed to ignite the powder that sets the bullet in motion down the barrel. The primer includes a relatively small metal cup containing a priming mixture, foil paper, and relatively small metal post, commonly ref
