Patent ID: 9557150
Date: 2017-01-31
CPC Classifications: F42B,F42C

Claim:
1. A grenade round including: a projectile; a case comprising a cylindrical side wall having an open front end to which the projectile is attached and a base wall formed integrally with the side wall and extending across the side wall at a rear end thereof, the case at least partially defining a primer chamber adjacent the base wall in which a primer is held and into which a mechanical striker of a firing weapon can extend for detonating the primer, the side wall defining a low pressure chamber at an operative rear end of the projectile and having an internal screw thread formation; and a propellant propulsion system including a propellant chamber assembly including: a) a cup-shaped chamber body insert defining an internal cavity for holding a propellant charge, the chamber body insert having an external screw thread formation which is screw threadingly engaged with the screw thread formation of the side wall, the chamber body insert having a front end defining at least one opening in communication with the low pressure chamber and an open rear end defining a rim formation, the chamber body insert having an internal screw thread formation near its open rear end; and b) a base plate insert which abuts the base wall of the case and which closes-off the open rear end of the chamber body insert thereby defining a high pressure chamber together with the chamber body insert, the base plate insert defining a central orifice which is in register with the primer chamber, the base plate insert defining a cylindrical locating formation which is received within the open rear end of the chamber body insert and which defines an external screw thread which is screw threadingly engaged with the internal screw thread of the chamber body insert, the grenade round being characterized in that the base plate insert defines a circumferential flange which abuts the rim formation of the chamber body insert and which extends beyond the rim formation.