Abstract: An anti-tank mine with a wide area of action comprising means for detecting a target of the tracked-vehicle type and a mine body incorporating a pyrotechnic charge, means for controlling the triggering of the mine in response to a signal given by the target detection means, means for firing the charge and means for propelling the mine body triggered by the control means. The target detection means are associated with reinforcement means to constitute at least one flexible guide-detection cable serving as a guide when the mine body moves under the action of the propelling means in response to the detection of a target. Preferably a plurality of guide-detection cables spreadable in several different directions around the mine body are used.

Abstract: The invention relates to a surface tension storage tank comprising a liquid outlet from where the liquid can be expelled under the action of a pressurant gas. A collector device issues into a chamber of a tubular device which also comprises a draining conduit opening at one end at the bottom of said chamber, the other end being situated higher than the first when the tank is being filled. On the side opposite its bottom, the chamber is situated close to the liquid-expelling orifice from which it is separated by an outlet gas barrier. Gas barriers are also provided at the other end of the conduit and on the level of the junction of the collector device with the said chamber.

Abstract: The simplified homing system comprises an accelerometric device mounted directly on the missile structure and associated with discriminating means for delivering signals representative of the lateral acceleration .gamma..sub.ext of the missle due to outside forces and the centrifugal acceleration .gamma..sub.c due to the rolling; target detection means directly mounted on the missile structure; passive means ensuring the keeping up of the rolling movement of the missile; means for determining from information supplied by the accelerometric device and discriminating means and by target detection means the serviceable values related to the vector V indicating the relative speed of the missile with respect to the air in a reference system related to the missile and to the vector u.sub.c representing the direction of the target with respect to the axis of the missile and means for elaborating a guiding force F.sub.p from the said predetermined serviceable values related to the vectors V and u.sub.c.

Abstract: The invention relates to a storage system comprising: an enclosure containing a liquid and a pressurant gas and a liquid-expelling device comprising a structure made up of rigid elements which define a grid-like interior surface forming a gas barrier and which delimit a central outlet passage and gaps whose width increases as a function of the distance to the central passage from a minimum value selected for the said gas barrier, to a maximum value selected so as to prevent the liquid contained inside the structure from being expelled into the enclosure as long as the acceleration does not exceed a given threshold, said structure constituting a buffer-tank from where the liquid can be expelled through the central passage under the effect of the gas at every phase of utilization and which is re-filled with liquid contained inside the enclosure by means of a feeding device which converges to a liquid input provided in the structure.

Abstract: A rotor centering device comprising two radial bearings each one constituted of first and second opposing members with angular contact races, mounted with axial clearance so that if one of the said members is in abutment, the other member has a radial clearance. The first angular contact centering members of the first and second bearings are also opposing, and the second angular contact centering members of the first and second bearings are likewise opposing, so that by relative axial movement of the inner and outer contact races of both first and second centering means belonging to the two bearings, simultaneous contact of the inner and outer faces is achieved either with the first centering members or with the second centering members which happen to be opposing on the two bearings.

Abstract: The present invention relates to a process for carrying out the first stage of separation of constituents of a reaction mixture obtained during synthesis of asymmetric dimethylhydrazine by the Raschig method, consisting in sending, into an empty central section (B) of a column, the reaction mixture coming from said synthesis, this central section being surmounted by a column (C) in which is effected separation of the volatile compounds contained in said mixture and being extended downwardly by an exhausting section (A).

Abstract: Annular three-dimensional structure formed by regularly criss-crossed filiform elements, divided in a plurality of families of elements occupying the same place within the structure arranged identically within the said structure. In order to have an undelaminatable structure with a selectable space distribution of its mechanical or physical properties, said structure includes two families of helical elements arranged in cylindrical sheets according to helices of identical pitch but of opposite direction, two families of oblique meridian elements arranged in meridian sheets and with opposite inclinations with respect to the axis, and at least a fifth family of radial elements arranged in meridian sheets, or of circumferential elements arranged in cylindrical sheets, or of axial elements arranged in meridian or cylindrical sheets.

Abstract: An axial electromagnetic bearing for smooth shafts of large diameter and relatively shorter length of the type comprising a stator of substantially annular shape and an armature in the shape of a disc attached to the shaft and located facing the stator, at least one axial position detector for the shaft being associated with the axial bearing, and the bearing being characterized in that the stator of the axial bearing is composed of four independent sectors each of which comprises a ferromagnetic core and a winding and each of the independent sectors of the stator of the axial bearing being controlled by at least one corresponding detector determining the axial position of the shaft in relation to the said sector.

Abstract: The structure comprises a stack of superimposed layers of bi-dimensional reinforcing material and rectilinear reinforcing elements which traverse said stack through and through and which are arranged in at least two directions different from each other, each reinforcing element being at an angle with the plane that is tangential to the layers it traverses.

Abstract: The method for producing a silicon carbide structure comprises the stages of immersing the carbon structure into a bath containing 20 to 40% by weight of silicon powder in suspension in a liquid medium containing 10 to 30% by weight of fugitive resin, the remainder being constituted by a resin solvent, and of drying the structure in order to obtain an easy-to-handle carbon structure coated with resin and silicon powder bonded in the resin. The structure is then subjected to a heat treatment to let the silicon react with the carbon and produce a silicon carbide structure.

Abstract: There is described a method and apparatus comprising a gasdynamic laser wherein the main gas flow is introduced into a chamber and heated therein and a secondary gas flow is injected into the heated main gas flow so as to produce laser emission, characterized in that the main gas flow, before being introduced into the chamber, is preheated to a temperature preferably above 500.degree. K.degree..

Abstract: The invention relates to a device for compensating the gain of a circuit servo-controlling the position of a rotor with the aid of at least one electromagnetic bearing provided with electromagnet windings, from signals delivered by at least one detector detecting the position of the rotor, the servo-control circuit ensuring the control of the supply of the windings in response to the signals delivered by the detectors and comprising an amplification circuit with which is associated a negative current feedback loop, said device further comprising supplementary electrical means for injecting at the input of the amplification circuit a signal depending on the variations in the airgap of the servo-controlled electromagnetic bearing, in a predetermined variation frequency zone. The invention is more particularly applicable to electronic circuits for controlling active electromagnetic bearings.

Abstract: A soldering machine for soldering continuously metallic, rectilinear and parallel elements, comprising:a driving device to move forward the elements to be soldered, which elements are disposed in parallel to the forward direction with at least one lower element, at least one higher element disposed on top of the lower element, and one layer of brazing solder interposed between the said elements in the area provided for the welding,a heating station comprising upper and lower heating rollers with incorporated heating means, which rollers, as the elements move forward, respectively roll under the or each lower element and over the or each upper element in the welding area, anda cooling station located downstream of the heating station and comprising lower and upper cooling rollers, which rollers, as the elements move forward, roll respectively under the or each lower element or over the or each upper element, to solidify the solder and to hold the said elements in close contact one against the other while they

Abstract: A removable magnetic suspension system for a rotor comprising at least one electromagnetic bearing constituted by an armature supported by a sleeve fast with the rotor and a stator mounted on a fixed support, and at least one electromagnetic rotor-position detector constituted by a fixed stator cooperating with a part forming an armature integral with the rotor for controlling the bearing characterized in that the detector is mounted independently of the bearing which it controls and comprises a stator removably mounted on a fixed support and disposed directly opposite a reference surface formed on the rotor and independent of the sleeve supporting the bearing armature.

Abstract: A flexible union for connecting together two rigid tubular sections capable of oscillating with respect to each other, the union comprising elastic annular members each having its inner and outer faces connected to annular spherical surfaces bordering a gap separating from each other two rigid bodies each fast with or connected to a respective tubular section. Each elastic element is in one piece and adheres to the spherical annular surfaces between which it is located and the elastic elements delimit in said gap at least one closed annular chamber completely filled with a liquid which is little or not compressible.

Abstract: System for the remote control, the maintenance or the fluid injection for a submerged satellite well head comprising a platform equipped with equipment usable for the remote control, maintenance or fluid injection for the well head and located substantially perpendicular to the well head, at least one pipeline connecting the platform to the well head, a control device located on the well head or in the immediate vicinity of the latter, and at least one remote control line connecting the platform to the remote control device, wherein the platform is on the surface and the pipeline is connected to the platform by a connector and to the well head by a spherical articulation equipped with a flexible joint.

Abstract: The present invention relates to a method for lifting an immersed device and returning it into position, and to a device for carrying out the method, wherein the device to be lifted up is provided with a locating buoy and a wound up guide line whose ends are connected to the buoy and to a locking member connected to the base on which the immersed device is mounted; the buoy is released, taking with it the guide line, along which the device is raised. The device to be replaced in position is provided with a new buoy, guide line and locking member and is lowered along the first mentioned guide line, which is severed after the device to be replaced in position has returned to the base. The method is applicable for example to lifting and replacing a remote-control pod for an underwater well head.

Abstract: The present invention relates to a three-dimensional structure having a preferential direction, said structure comprising a main bundle constituted by equidistant rectilinear elements parallel to the preferential direction and four connecting bundles oriented in four different directions. A first and a second connecting bundle are formed of elements disposed in rows in planes parallel to the planes defined by the rows of the main bundle, the rows of the first and of the second bundle being disposed alternately in gaps between rows of elements of the main bundle. A third and a fourth connecting bundle are formed of elements disposed in rows in planes parallel to the planes defined by the alignments of opposite elements of adjacent rows of the main bundle, the rows of the third and fourth bundles being disposed alternately in gaps between alignments of elements of the main bundle. The structure is suitable as reinforcement for a composite material.

Abstract: The invention relates to an annular three-dimensional structure usable in particular as reinforcement, said structure being formed of a regular criss-cross of elongated filiform elements distributed in four families, the elements of each family being disposed in parallel, regularly spaced apart sheets themselves constituted by elements extending substantially parallel to one another and regularly spaced apart. The elements in each sheet have a different orientation from that of the elements of the adjacent parallel sheet of another family, the elements of at least two families being incurved in opposite directions.

Abstract: The invention relates to a device for the horizontal stabilization of a mass supported vertically with the aid of springs, intended for damping the oscillations of the mass in a horizontal plane, for a given vibration frequency band, said device comprising two active electromagnetic radial bearings and at least two accelerometers placed on the mass to be stabilized. The bearings are controlled from signals furnished by the accelerometers which are sensitive to oscillations of the table in two orthogonal horizontal directions.