Accession Number : ADD007750

Title :   Ammunition.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON DC

Personal Author(s) : Dunham,James V

Report Date : 06 Nov 1979

Pagination or Media Count : 6

Abstract : A round of ammunition adapted to be fired without a detectable visual or aural effect, said round comprising a substantially rigid cartiridge case, a projectile carried by said case, a propellant charge within said case, means whereby said charge may be fired, a piston in said case between said projectile and propellant, a forward portion of said case being provided with a shoulder by means of which said piston may be decelerated, a longitudinally tapered shoulder on said piston adapted to be deformed by said case shoulder and assist in sealing in products of combustion by said propellant as said shoulders engage in decelerating said piston, said piston being provided with a peripheral recess in rear of said piston shoulder and into which said piston shoulder may be at least partially deformed in deceleration, said piston being provided with an O ring on a rear portion, a base cup for compressing said O ring on firing said propellant, the base cup being spaced from a rear end wall of said piston to insure application of propellant pressure to said O ring, a shear pin connecting said projectile.

Descriptors :   *Patents, *Ammunition, *Energy absorbers, Case hardening, Infrared detection, Acoustic detection, Optical detection, Smokeless propellants, Muzzle flash, Blast waves, Pistons, Deceleration, Gas seals, Sabot projectiles

Subject Categories : Acoustic Detection and Detectors
      Optical Detection and Detectors
      Infrared Detection and Detectors
      Ammunition and Explosives

Distribution Statement : APPROVED FOR PUBLIC RELEASE