Accession Number : ADD006615

Title :   Cartridge for Reducing Bare Erosion and Extending Barrel Life.

Descriptive Note : Patent Application,


Personal Author(s) : Dobbs ,Herbert H

Report Date : 16 Jun 1978

Pagination or Media Count : 11

Abstract : The invention concerns a liquid filled plastic capsule placed immediately behind the projectile is forced against the projectile base when the propellant charge is ignited. This action ruptures a diaphragm in the forward face of the capsule, releasing the encapsulated liquid and forcing it into the space around the projectile. The resulting liquid film acts as a lubricant and obturator between the projectile and barrel and as a cooling film for the barrel. The ruptured capsule serves as a piston, keeping the powder gases separated from the liquid surrounding the base of the projectile and forcing the liquid surrounding the base of the projectile and forcing the liquid to flow between the projectile ad the surface of the bore. This results in reducing bore erosion and extending barrel life. The capsule might be placed in the neck of the cartridge in the case of fixed ammunition or attached to the base of the projectile in the case of separate loading ammunition.

Descriptors :   *Patent applications, *Gun barrels, *Cartridges, *Erosion, *Lubricants, Inventions, Life expectancy, Liquids, Capsules(Pharmacy), Rupture, Propelling charges

Subject Categories : Lubricants and Hydraulic Fluids

Distribution Statement : APPROVED FOR PUBLIC RELEASE