Hand grenade with wave-forming means between chambers

An improved hand grenade having a non-spherical elongated fragmentation body substantially surrounding an elongated interior chamber, an explosive filled within the interior chamber, a detonator head and a detonator tube connected to the detonator head, wherein the improvement comprises the interior chamber being formed with a cross-sectional constriction intermediate the length thereof with an inwardly projected annular rib sub-dividing the chamber into an upper chamber and a lower chamber on opposite sides thereof so as to act as a wave-forming means between said upper and lower chamber, said upper chamber being superjacently arranged above and communicating with the lower chamber, said lower chamber having a length of at least half the length of the elongated interior chamber, said lower chamber having a curved side wall which projects inwardly at its upper end to form said annular rib, and wherein the detonation tube is extended from the detonator head through the upper chamber into the lower chamber so that the detonation firing point is approximately at the center of the lower chamber.