Abstract: A base element fuze having dual safing is disclosed. The fuze is useful with an explosive type shell propelled into a ballistic trajectory from the barrel of a gun. The fuze is actuated to move from first safety to the armed condition after experiencing the inertial setback forces of gun firing followed by the drag forces of deceleration during the ballistic flight phase before target impact. The firing circuit contains an inertial magnetic power supply or setback generator which produces a voltage pulse when the gun is fired, a storage capacitor to receive and store the pulse which is later used to initiate a detonator, and switch closure interface circuitry encircuiting the capacitor with the detonator at target impact. The sequence of events within the fuze is programmed by a spring driven rotor which is latched in first safety when assembled, is released when the gun fires, and moves to the armed position in about 18 ms.

Abstract: A muzzle velocimeter comprising a pair of sensors positioned adjacent to the path of a projectile containing magnetic material wherein each of the sensors includes a permanent magnet having a wire coil wound thereon. The magnets provide magnetic fields which are disturbed by magnetic materials in a passing projectile causing each of the sensor coils to develop signal pulses. The distance between the sensor coils and the amount of time between the sensor coil pulses are used to calculate the velocity of the passing projectile. In an alternate embodiment a single sensor coil is used to sense the leading and trailing edges of a passing projectile, and the projectile velocity calculated by using projectile length and passing time of the projectile.

Abstract: A rocket firing system comprises a magnetic core, a co-axial driver coil and a sensor coil or coils which are connected to a detector device which detects the presence and the desired state of a further coil which is inductively linked to the magnetic core. In use a low-power signal voltage is first applied to the driver coil. Subject to the detector device indicating the presence and desired state of a firing circuit of a rocket including the further coil, an operating power voltage is then applied to the driver coil to induce a firing voltage in the firing circuit.

Abstract: This invention relates to an electric device for the ignition of pyrotech substances and more particularly an electric device which operates by electromagnetic induction.The device comprises: An induced member 22 placed in a cartridge containing a pyrotechnic substance within a circular opening of the bottom of the case 20, and an inductor located in a cavity 24 made in the thickness of a firing plate 23. The induced member has at least one open turn 31 connected to at least one heating filament 32, mounted on a thin insulating pellet 30, the inductor is a spiroidal winding 25 whose frequency defines the operating frequency of the generator; the inductor comprises a thermal protection means, a mechanical protection means and sealing means.The device can be used in particular in the field of artillery.

Abstract: A method and apparatus for detonating an explosive in response to the dettion of a remote explosive without damaging any components positioned intermediate the two explosives. A permanent magnet having a coil of wire positioned thereabout is positioned adjacent to one of the explosives, and the output from the coil is connected to the detonator for the second explosive. When the first explosive is detonated, the permanent magnet is destroyed to thereby collapse the magnetic field traversing the coil. The collapse of the magnetic field generates a voltage which is transmitted to the detonator for the second explosive for initiating detonation of same. The preferred embodiment positions the coil and magnet adjacent to an electronic time fuze detonator and lead charge at the forward end of a cargo-carrying projectile, whereas the second explosive is positioned at the rear of the projectile for initiating ejection of a payload.

Abstract: An electronic switch for projectiles includes a circuit with a source of electric energy which is switched in when the projectile is discharged. The circuit includes an adjustable time-delay device for the explosion of the projectile, a device for preventing muzzle burst, and a self-destruct arrangement. The exploding fuse is connected to the source of energy by an impact or a proximity switch. The self-destruct arrangement is settable by cooperating cells carried by the projectile and by the barrel of the gun.

Abstract: A device for transmitting signals to a projectile fuse (1) by induction comprises a coil (5) for emitting an energy signal picked-up by a coil (3) inside the fuse. This coil (3) is wound on a first magnetic core (2). A second magnetic core (6) carries three receptive coils for information carrying signals. This information is emitted by three coils (19,20,21).This arrangement permits separating the transmission of the energy signals on the one hand and the information carriers on the other hand.

Abstract: An annular alternator for use with a fuze ogive having an annular rotor w alternating magnetic poles and an annular stator coil enclosed by a highly magnetically permeable toroid having spaced interdigitating poles on the surface adjacent the magnetic poles.

Abstract: 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 twisting action of the currently used inflated ribbon which is extended from the grenade while it is in flight, to generate an electromotive force signal. 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.