F - Mech Eng,Light,Heat,Weapons – 42 – B
Patent
F - Mech Eng,Light,Heat,Weapons
42
B
F42B 5/045 (2006.01)
Patent
CA 2042300
ABSTRACT OF THE DISCLOSURE 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.
Alliant Techsystems Inc.
Smart & Biggar
LandOfFree
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