Remington Arms Company, Inc.

John J Scanlon

William T Cole

Raymond A Anderson

Joseph P Pavone

Expendable case ammunition of the type which is expelled as a unit through the barrel of a firearm and whose case separates from contained projectiles in flight, comprises a body and a cap, and may include a separate projectile container. These parts are made of a deformable material such as plastic, and are snap-locked together. The body has an interior transverse wall separating a projectile chamber from a propellant chamber, which is enclosed by the imperforate cap to permit the use of loose propellant and to protect against contamination and accidental ignition. An anvil is integrally formed in the propellant chamber wall to cooperate with an internal primer and a firing pin which penetrates the cap. A diaphragm region of the cap is ruptured by initiation of the primer, and the cap remains attached to the body during ignition of the propellant and travel of the ammunition unit through the barrel of the firearm.

Expendable case ammunition

A composite ammunition casing, especially for use in repeating firearms or guns in whose chambers a temperature gradient develops, from a maximum at the forward throat portion to a minimum at the rear breech portion. The casing includes a forward metallic member and a rear member formed of a material having a lower temperature resistance, such as plastic. The casing members have an interlocking junction at a point spaced along the firearm chamber at which the expected local temperature of the chamber drops to a level within the temperature resistance capability of the rear member. The interlocking junction is formed by surface interruptions in the wall of the forward member, into which the material of the rear member projects.

Composite ammunition casing with forward metallic portion

A composite cartridge casing having a plurality of component parts, which may be of dissimilar materials such as metal and plastic, includes a tubular casing body formed with a mouth portion for receiving a projectile and with a breech portion which has a cylindrical interior wall extending forwardly from an opening in its base. An annular bridge insert member has a forward cup portion which is receivable through the base opening into the casing body, a rearward skirt portion of reduced diameter, and a frusto-conical central portion connecting the cup and skirt portions. After insertion of the bridge insert, the breech portion of the casing body is deformed and reduced to engage the frusto-conical and skirt portions, thereby securing the assembly and forming an extraction groove around the base of the casing. A head assembly is then attached to the base to complete the casing.

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Monroe, CT, United States of America

John J Scanlon