Increased safety in use, and improved function, of ammunition items (USH0000251)
Original Publication Date: 1987-Apr-07
Included in the Prior Art Database: 2008-Mar-26
US Statutory Invention Registration (SIRs)
Related DocumentsPatent/Patent Application:
An electrically detonated fuse for a grenade is shown, used either as a b up system for the usual mechanical detonator, or independently as the sole arming and detonating means. The invention is considered more accurate and dependable than a mechanical system, which is aimed at the objective of reducing the amount of grenade duds, the dangerous phenomenon of still live grenades unexploded upon impact creating a hazardous situation for military and other personnel. The invention uses the ordinary action of the currently used inflated ribbon which is extended from the grenade while it is in flight, to generate an electromotive force signal via a piezoelectric crystal. An electrically activated detonator is installed next to the grenade's main charge, for blowing the device when the electrical detonator is switched on. A large surge of power is fed to the electrical detonator by the closing of an electrical impact fuse, when the grenade physically impacts a target. To store the necessary voltage for detonation a capacitor bank is employed, which store is charged by the said generated e.m.f. signal. The e.m.f. signal is generated through opposite polarization of a piezoelectric crystal, which the ribbon acts on in compression.