Abstract: An explosive hand grenade comprises a hollow spherical shell having a sin opening surrounded by a tubular hub, a tubular housing threaded into the hub and extending into the shell, a barrier plate with an eccentric hole closing the inner end of the housing, booster cup attached to the housing and extending beyond the plate to form a booster charge cavity, a rotatable mandrel in the housing, next to the barrier plate, having an eccentric passage therethrough out of alignment with the barrier plate hole in a first position, a bushing fixed in the housing, next to the mandrel, having a passage aligned with the mandrel passage, a unitary combustible delay cord extending through both passages and preventing rotation of the mandrel, an igniter and a striker therefor for igniting the end of the cord remote from the barrier plate, manually-releasable means for initially preventing rotation of the mandrel and operation of the striker until the grenade is thrown, and a torsion spring for rotating the mandrel, after the

Abstract: A hand grenade is provided with a fuze comprising: a firing means, means luding two centrifugally-operated elements movably carried by the grenade housing for arming the firing means, means including an inertia member rotatable relative to the housing and a torsion spring between the inertia member and the housing for spinning the housing to operate the arming elements, and manually-held safety means for preventing arming until the grenade is thrown. Two disclosed embodiments have different arming and firing means with substantially the same spinning means.

Abstract: A fuze setting device utilizes a plurality of detented, rotatable, magnet sitioning time setting rings and an encoding disc for controlling the amount of electrical pulses that a timing oscillator is required to subsequently generate to fill an "and" gate controlled multi-stage counter. The counter after being filled generates a fuze initiating signal. A setback detented electromagnetic pulse generating despin operated sensor assembly is used in combination with the oscillator to generate electrical pulses for partially filling the counters in accordance with the relative angular positioning between the magnetic source setting rings and the pole pieces of electrical coils which generate a stop pulse to regulate the number of pulses necessary to fill the counters.