Abstract: The present invention relates to arming methods and devices for firing a submarine weapon.A device according to the present invention comprises a piston connected by a strip to a bistable arming organ. The piston shifts inside a cylindrical body between a first and second chamber. The first chamber accommodates sea water through orifices. The second chamber accommodates sea water through a valve and a cavity which is filled with sodium chloride. The piston is hollow and contains a semi-permeable fitting which is in contact with sea water that is contained inside the first chamber through a bore and ducts, and with the salt saturated solution contained inside the second chamber through channels.

Abstract: An armor-penetrating projectile comprises an outer substantially cylindrically tubular member of great length/diameter ratio and density, centered on an axis, and having an axially throughgoing bore defined by an inner surface and an axially elongated inner member of greater strength and elasticity than the outer member extending axially through the bore the full length of the outer member and having an outer surface in tight radial contact with the inner surface of the outer member at at least a plurality of annular locations spaced along the axis. This inner member can be a bundle of wires that is inserted through the bore after the outer member has been expanded by heat, then twisted and longitudinally prestressed to lock tightly in the outer member.

Abstract: A supply mechanism for gas projectile firing devices includes: a magazine having a storage column for projectiles and a transfer slide for moving projectiles from a column to a position in line with the firing chamber; a mobile element having a transfer bar for moving the transfer slide from the column to its position next to the firing chamber, an insertion piston for moving projectiles from the transfer slide into the firing chamber and a firing pin for opening the valve connecting the compressed gas reservoir to the firing chamber; a trigger which activates the firing and prevents double insertion of a projectile, and a cocking rod which controls the mobile element and the trigger. The mechanism is applicable to training and sports weapons, and to nail and staple guns.

Abstract: The high frequency oscillator includes a piezo-electric crystal (1) which is connected to at least two exciter electrodes (3, 4) and means which make it possible to apply on the one hand to the electrodes (3, 4) electric excitation power for the crystal according to a useful vibratory mode which is selected to determine a frequency reference, and on the other hand additional electric power for exciting the crystal according to an overtone vibratory mode which is distinct from the useful vibrational mode. Means (46, 47) are also provided to regulate the electric excitation power of the crystal according to the useful vibratory mode in a predetermined and constant proportion in relation to the additional electric power. The invention makes it possible to compensate, using the isochronism deficiency stemming from the additional vibration on the useful mode, the indirect amplitude-frequency effect stemming from the additional vibration, and vice versa.

Abstract: A heating system for an HF oscillator.The system comprises a reentrant cavity (10) controlling an UHF oscillator and sized to generate an UHF electric field with a frequency F much higher than the resonance frequency F.sub.Q of the piezoelectric crystal (50) of the HF oscillator which itself is located in the space between the central core (14) and the bottom (12) of the cavity and in such a manner that the two electrodes (34,35) of the oscillator are respectively located substantially in the planes of the free end of the central core (14) and of the inside of the bottom (12) of the cavity (10). The electrodes (34,35) are located in bores (16,15) in the conducting parts of the cavity in such a manner that the peripheral part of each electrode is surrounded at close proximity but without making contact with the wall of the corresponding bore (16,15). The electrodes (34,35) are connected to an HF oscillator by insulated leads (24,25).

Abstract: A smoke generating pyrotechnic composition of the type comprising an oxidizing agent--reducing agent system, a sublimable organic dye and including a binder additionally, contains a carbazate of general formula ##STR1## in which R represents a straight-chained or branched-chained alkyl group comprising 1 to 5 carbon atoms as cooling agent, inter alia. The composition is suitable, when the binder is a synthetic resin and includes such additional components as organic plasticizer and possibly a hardener and a metal oxide catalyst, for use in the production of cast smoke generating pyrotechnic products.

Abstract: The subject of the invention is a castable pyrotechnic composition of the type producing smoke with a colored or colorless flame comprising in particular an oxidation-reduction pair and a chlorinated binder. The binder is a high chlorine content resin. It is constituted by the association of a polymerizable chlorinated monomer with a copolymerized or non-copolymerized chlorinated polymer, the resulting mixture being subjected to polymerization at a moderate temperature, said binder then containing 30 to 70% by weight of chlorine.

Abstract: A solid electrolyte formed of a cross-linked elastomeric complex material charged with one or more ionizable salts of high ionic conduction.

Abstract: The invention relates to a hot-wire ignition initiator for propellant charges for artillery and rockets.This initiator comprises a housing 1 provided with an open cavity 2 within which there is arranged a filament 3 and a pyrotechnic cell composed: (a) of an initiator pyrotechnic composition 5 formed of an oxidant and a reducer, which composition is arranged in intimate contact with the filament, the coefficient of sensitivity to impact of which is at least equal to 100 joules, the coefficient of sensitivity to friction of which is at least 100 N, the coefficient of sensitivity to static electricity of which is about 16 millijoules and the ignition temperature of which is between 250.degree. and 350.degree. C.

Abstract: The present invention relates to a new kinetic-energy projectile. The projectile of the invention comprises a piercing head consisting of:a head penetrating meansa main penetrating meansand a spacing means located between the head penetrating means and the main penetrating means.The projectile of the invention is used to pierce light, heavy and strongly sloping armor.

Abstract: Apparatus is described for releasing a storage container from an inflatable upport such as a parachute, comprising a container for holding the inflatable support, an attachment mechanism extending through the container, linear slide means engaging the attachment mechanism and a storage container when tension is applied to the attachment mechanism, and means for holding the attachment mechanism in tension until the inflatable support is inflated, whereby the storage container remains fixed to the inflatable support until tension on said attachment component is relieved.

Abstract: The primer comprises a conductive pyrotechnical priming composition 3, placed in contact with the useful pyrotechnical charge 2 of the primer and two electrodes 6 and 7 arranged in electrical contact with the conductive pyrotechnical composition 3.The two electrodes 6 and 7 are connected to a stable electric resistor 10, connected in parallel to the conductive pyrotechnical composition 3.

Abstract: A new piezoelectric transducer incorporated with a mechanical amplifier is described. The transducer comprises a rigid base plate; two lateral plates whose lower edge is connected to the plate by a thin portion; a stack of piezoelectric elements having alternate electrodes; a horn formed of a flexible elastic diaphragm which connects together the upper edges of the two plates; an enclosure and a sealing skin which is acoustically transparent. The tranducer is capable of emitting or receiving high power acoustic waves of very low frequencies including for instance, a few Hertz to 500 Hz.

Abstract: The invention relates to spiropyran compounds. They have the general formula (I): ##STR1## in which: X represents the CH.sub.2 group or a sulfur atom; R.sub.1 and R.sub.2 represent electron donor and/or acceptor groups selected for instance from the group NO.sub.2, COC.sub.6 H.sub.5, CN, the halogens, the acyl substituents, alkoxy substituents, the hydrogen atom, the alkyl and mercaptoalkyl groups, the ethers of the formula CH.sub.2 OR, thioethers of the formula CH.sub.2 SR and amines of the formula CH.sub.2 NR.sub.2 in which R represents an alkyl group; R.sub.3 is a linear or branched alkyl group, having 1 to 18 carbon atoms, or an arylalkyl or alkenyl group.--R.sub.4,R.sub.5,R.sub.6,R.sub.7,R.sub.8 and R.sub.9 have one of the meanings indicated for R.sub.3 or represent, two by two, with the group in ortho position, a --(CH.sub.2).sub.n -- group in which n is a number between 5 and 10.R.sub.10 represents a hydrogen atom if X=S and if X=CH.sub.

Abstract: A rivet apparatus is provided for securing together a first element to a second element made of solid metal. The apparatus comprises a support 3 which is common to the first element and to a hollow charge 4. A metal rivet or nail 5 embedded in the charge of the hollow charge, in the axis of a liner 6 of the hollow charge 4. The support 3 has a surface 7 intended to be applied against a second hard metal element 2 and approximately centered on the focal point F of the hollow charge 4. Upon detonation of the charge, the metal rivet or nail 5 enters the second element 2 thereby binding first and second elements together.

Abstract: A piezoelectric resonator comprises a crystal having an outer peripheral portion connected to a central portion by an intermediate zone which is short in the radial direction, is hollowed out over its major part and has at least two connector bridges between the outer and central portions. Electrodes are arranged facing one of the main portions of the crystal which then forms the vibrating portion of the resonator. The non-vibrating main portion serves as a support for the crystal. The surfaces of the connector bridges are continuous with the corresponding surfaces of the vibrating portion.

Abstract: An automatic two wavelength photoelasticimeter comprising, in succession, a light source for emitting light having at least two wavelengths, .lambda..sub.1 and .lambda..sub.2 ; a polarizer rotating at constant speed, an orientable quarter-wave plate of orientation .beta. with respect to a reference axis; a model to be analyzed exhibiting double-refraction and having a fast axis which forms an angle .theta. with respect to the reference axis and which provides a phase shift .phi. (which parameters .theta. and .phi. are to be measured) and three photodetectors 5, 6, and 7 preceded by analyzers 10, 11 and 12 respectively. The photodetectors 6 and 7 are preceded by filters 8 and 9 of wavelengths .lambda..sub.1 and .lambda..sub.2 respectively. The difference between the phases of the signals of the frequency 2.omega.

Abstract: Piezoelectric transducers and antennas comprising a plurality of identical transducers arranged coaxially, each transducer comprising a ring and a plurality of piezoelectric motor elements arranged radially against the inner wall of the ring. The rings form an envelope which is closed by two covers and the envelope encloses an axial cylindrical channel containing a piston. The inside of the envelope contains a solid material which is elastomeric or rigid and is separated from the inner walls of the envelope by a small clearance which communicates with the end of the cylinder. An application is the construction of acoustic antennas intended to be immersed to great depths.