초록 ▼

A cartridge case 68 for a cased telescoped ammunition round 10. Cartridge case 68 includes a hollow cylindrical casing 12 fabricated from a material which undergoes elastic deformation when round 10 is fired from a gun, a rear seal 20 and a front seal 22. A control tube is secured to rear seal 20 an

A cartridge case 68 for a cased telescoped ammunition round 10. Cartridge case 68 includes a hollow cylindrical casing 12 fabricated from a material which undergoes elastic deformation when round 10 is fired from a gun, a rear seal 20 and a front seal 22. A control tube is secured to rear seal 20 and a primer is mounted to be in communication with the interior of control tube 24. Casing 12 has an axis of symmetry 18 which is also the axis of symmetry of round 10, and control tube 24. Seals 20, 22 each have side walls 48, 48′in which crimp grooves 56, 56′are formed. Each crimp groove includes a cam surface 58, 58′. Rear and front portions 14, 16 of casing 12 are crimped into grooves 58, 58′. A projectile 26 provided with a booster piston 28 is mounted within round 10 with piston 28 being located within control tube 24. The main propellant charge 38 is positioned around control tube 24 and round 26, and a booster charge is positioned with control tube 24. When round 10 is fired, axial growth of casing 12 forces portion 14, 16 to ride up cam surfaces 58, 58′expanding them. When the pressure within casing 68 returns to normal, the expanded parts of portions 14, 16 act to retract end seals 20, 22.

대표청구항 ▼

In a cased telescoped ammunition round having a hollow cylindrical outer skin having a rear portion, and a front portion, a rear seal, a front seal, and an axis of symmetry; the improvements comprising: fabricating the outer skin from a stainless steel; the rear seal and the front seal each having a

In a cased telescoped ammunition round having a hollow cylindrical outer skin having a rear portion, and a front portion, a rear seal, a front seal, and an axis of symmetry; the improvements comprising: fabricating the outer skin from a stainless steel; the rear seal and the front seal each having a base and an annular side wall integral with its base, each side wall of the seals having a cylindrical outer surface and an outwardly tapering inner wall terminating in a lip, a crimp groove formed in the outer surface of the side wall of each seal, a wall of the crimp grooves of each seal nearest the lips forming a cam surface; the rear portion of the outer skin being crimped into the crimp groove of the rear seal and the front portion of the outer skin being crimped into the crimp groove of the front seal; only the front and rear portions of the outer skin being annealed prior to being crimped into the crimp grooves of the front and rear seals; during firing of the round, radial expansion of the outer skin causing elastic deformation of the outer skin, and axial growth of the round forcing the front and rear portions of the outer skin crimped into the crimp grooves of the front and rear seals to ride up the cam surfaces of said grooves, expanding the diameter of the crimped portions of the outer skin, the stress induced in the expanded crimped portions retracting the end seal when the pressure within the round returns to ambient.