Abstract: The present invention relates to a process and device for the non-destructive examination of riveted joints or the like, particularly for monitoring the fuselage of an aircraft. According to the invention, an eddy current probe is used and two rectangular components of the signal of unbalance from the latter are compared with thresholds predetermined by prior measurements on similar new joints, in order to determine the presence and/or the absence of cracks.

Abstract: This invention relates to a device for indicating the temporally variable quantity of a liquid contained in a reservoir or tank, whatever the indication of this reservoir with respect to the horizontal, wherein the device comprises an auxiliary recipient fast with the reservoir, which is arranged therewith in an at least partially enveloping arrangement and which contains an invariable quantity of an auxiliary liquid of which the level serves as reference for assessing, by comparison of level, the variable quantity of liquid contained at a given instant in the reservoir. The invention is more particularly applicable to the determination of the level of fuel in a tank connected to a vehicle, of the oil in a gearbox of a vehicle, etc.

Abstract: The assembly comprises a collector nozzle which is fixed to a turbine engine and which is elbowed laterally towards the exterior and which debouches into injection nozzles which are also elbowed and which open into a mixer masked laterally by means of a fairing, of which a shaped forward section defines, with an internal shaped screen and a central plug, a semi dynamic principal air inlet. The aspirated air dilutes the gas in the mixer which is terminated by means of an elbow directed upwardly and which can pivot about a transverse axis. In the position of maximum deviation upwardly this elbow masks the hot parts of the assembly from the rear. The assembly is particularly useful for equipping helicopters with lateral exhaust gas turbine engines, and it can be original equipment or retrofitted. The assembly serves to reduce the infra red emission from the helicopter, to defeat infra red homing missiles.

Abstract: This invention relates to a process and device for assisting positioning of workpieces by superposition of images, wherein there are displayed on a screen the image of the workpiece to be positioned and the image of a model positioned with respect to a marking system and the workpiece is displaced over its support until the image thereof is brought into superposition with the image of the model.

Abstract: A mold having a concrete base and a mold cavity member lined with sheet metal. Adjacent the sheet metal are electric heating means and between the electric heating means and the concrete base is a light-weight concrete insulating layer.

Abstract: An illumination device for a liquid contained in a container for checking the liquid. The device includes a device for positioning the container and a light source arranged to illuminate the liquid via the base of the container with a light beam aligned along the axis of the container. The invention resides in a mechanism for shaping the light beam issuing from the light source, disposed between the source and the base of the container, and which cooperates with the optical system constituted by the base itself and the liquid, if in contact with the base, in such a fashion that the beam passes substantially through the whole of the volume of the liquid without impinging on the side walls of the container which are in contact with the liquid. The image of the light source the other side of the mechanism for shaping and the container base is preferably located in the neighborhood of the end surface of the liquid, or past it.

Abstract: A life-saving basket and equipment handling device having a plurality of parallel horizontal frame elements connected to at least two U-shaped hoops arranged in planes perpendicular to the planes of the frame elements to form mesh sides of the basket, the bottom of the basket being provided with longitudinal elements forming supports. Each hoop is connected to each frame at each point of intersection by a separate connecting element. The free ends of each hoop and those of two handle elements of inverted U-form are joined by a top edge frame which includes two longitudinal members on which are engaged, spaced by distance pieces, the free ends of the hoops and the handle elements, and two transverse members connected to the ends of the longitudinal members.

Abstract: The invention concerns the production of three-dimensional thread packages. Vertical rods (11) are maintained in a stationary arranged network by engagement through perforated plates (12,13). A thread (10) is deposited from above this network by a shuttle (9) in a sinuous path between upper end portions of the rods (11). The layers of thread thus formed in succession, supported by the perforated plate (12) which undergoes a descending movement, are compacted by a perforated plate (7) which is lowered upon the finishing of each layer. A lacing arrangement (35) replaces the rods (11) by threads after the thread layer phase.

Abstract: Device for locking a cowl with double security, comprising panel securing means, constituted by a plate integral with the panel and having a conical hole, as well as by a conical stop integral with the fixed structure and which enters the plate hole when the panel is in the closed position. Locking means are constituted by a locking bush or flange integral with the fixed structure, a support mounted on the panel, a bolt mounted in pivotable manner on the support and able to engage in the locking bush when the panel is in the closed position. Elastic means draw the bolt towards the disengaged position of the locking bush. A pawl mounted on the support locks the bolt in the engaged position.

Abstract: Each blade is fixed to the hub by the root part of the spar, arranged in the form of a loop surrounding a connection element bolted on the hub, with the interposition of rigid rings by a pin simultaneously fixing the hub on a drive sleeve transmitting thereto the driving torque of the central shaft. The hub comprises two coaxial cylindrical walls in each of which is pierced, for each blade, a circular opening in which the member for controlling the angle of attach which is fast with the blade root is mounted to rotate via self-lubricating rings. The invention is particularly applicable to helicopters.

Abstract: The invention relates to a weapon system intended for the structural destruction of a target. According to the invention, this system comprises computing means which are mounted on board said missile and which, from the values of the velocity Ve of the missile and of the relative target-missile velocity V.sub.R, as well as from the angle D between the longitudinal axis of the missile and said relative velocity V.sub.R, calculate at an instant close to said instant of detection furnished by proximity detection means, a duration which is then counted down by said computer means from said instant of detection and at the end of which said computer means control said focussed charge.

Abstract: The invention relates to a portable device for the non-destructive examination of a surface along a line, by means of at least one detection probe displaced along said line and guided by a guide removably fixed on said surface, wherein said guide has a length such that any portion of said line of comparable length presents a negligible variation in curvature, said probe is mounted in a probe-holder adapted to be displaced by hand and connected to said guide in rigid manner parallel thereto and in loose manner transversely to said guide, and means are provided for indicating, at each instant of a displacement of said probe-holder along said guide, the position of the probe-holder on the latter. The invention is particularly applicable to the verification of the riveted joints of aircraft fuselages.

Abstract: Machine for cutting strip-like material by a high pressure fluid jet comprising a substantially flat bearing surface able to support the strip-like material a cutting nozzle discharging a fluid jet under high pressure towards the strip-like material, means for displacing the nozzle in a direction Y perpendicular to the strip length, wherein it also comprises means for displacing the strip-like material in both senses according to a direction X parallel to the length of the strip, in such a way that the combined displacements of the strip-like material and the nozzle make it possible to make cuts of a random shape over a random length of the said strip-like material, wherein the bearing surface of the machine upstream of the cutting nozzle and on either side of the means for displacing the strip-like material, is in the form of a fixed table on which the latter moves within a guidance tunnel.

Abstract: A device comprising cyclic plates driven by flexible blades for controlling a helicopter rotor. The device comprises upper flexible curved blades pivotably mounted on the rotor shaft, above the rotary plate, and pivotably mounted by a ball joint on the rotary plate, so as to cause it to rotate with the rotor shaft and at least one lower flexible curved blade, pivoting on an element of the structure of the helicopter and pivotably mounted by a ball joint on the non rotary plate, so as to secure it against rotation. The transverse stiffness of the blades ensures centering of the plates whereas the longitudinal flexibility of the blades and their end pivot point allow the blades to follow the axial translational and tilting movements imparted to the plates by pilot controls pivotably mounted to the non rotary plate, and transmitted to levers controlling the angle of attack of the rotor blades by means of links pivotably mounted to the rotary plate.

Abstract: A closing and filling unit having a piston valve (22) whose closure member (28) is provided with axial openings. A rotatable and slidable element (32) is provided for actuating the valve. Arrangements (35, 40, 41, 33, 36) are provided for utilizing the pressure of the fluid to force the element (32) into engagement with the piston (28). The device is adapted to be detachably fixed to the body of the valve by means of a screw-threaded boss through which extends an actuating rod (37) which is rigid with a piston (36) sliding in a chamber (33).

Abstract: The invention relates to a device for forming and welding blanks in a material able to become superplastic, of the type comprising cooperating dies between which such blanks are placed, which dies are respectively mounted on a lower frame and on an upper frame of the device.The device according to the invention is remarkable in that the lower frame is constituted of a base and of a vertically movable part carrying a die, in that an inflatable bladder is interposed between the base and the movable part of the lower frame, in that a mechanical a lock is provided for connecting together the the base and the upper frame, when the latter is in low position, and in that, in the low and locked position of the upper frame with respect to the base of the lower frame, cooperation of the dies is achieved by controlling the bladder.

Abstract: The invention concerns a composite assembly forming a thermal protection or dissipation screen comprising a hot wall and a cold wall, wherein it includes between said hot wall and said cold wall at least two adjacent elements called vaporizer superheaters of a refractory material, each comprising within itself a socalled reactive substance capable of releasing at a given temperature specific to each element a non flammable gas or vapor, each of said elements being separated from the other by a wall sealed from the temperature of release of vapor or gas of the element located the closest to said hot wall but capable of becoming porous as soon as such temperature is exceeded, each element due to the presence of said reactive substance evolving from the vaporizer function to the superheater function depending on development of the thermal aggression to which it is submitted.

Abstract: A tail rotor arrangement for rotary wing aircraft, comprising a tunnel of axis X--X transverse with respect to the aircraft and in which is disposed a multi-blade rotor coaxial with respect to the tunnel and generating a transverse air flow. The arrangement comprises a plurality of fixed blades disposed inside of the tunnel downstream of the rotor with respect to the air flow and arranged in at least substantially radial manner with respect to the tunnel in order to be able to recover, in the form of an axial thrust, the energy of rotation of the air flow at the outlet of the rotor. The tail rotor arrangement provides an increase in thrust of the rotors, particularly paired rotors.

Abstract: The present invention relates to a kinetic wheel arrangement comprising a stator, a rotor and a magnetic suspension, wherein said rotor comprises a central recess about said axis of rotation; there is disposed in said central recess of the rotor a pressure system provided with a screw which is connected to the stator and of which the axis merges with said axis of rotation of the rotor, this pressure system being adapted to take a first position for which said rotor is free to rotate about its axis of rotation while being suspended by its magnetic suspension, and a second position for which it presses said rotor against said stator to immobilize it; and remotely-controlled means are provided to cut said screw between said stator and said rotor. The invention is particularly applicable to the caging of the rotor in phases during which the kinetic wheel arrangement undergoes considerable mechanical stresses.

Abstract: Skid landing gear provided with components having a device for absorbing energy by plastic deformation and/or for limiting stress, and components of this type.According to the invention, each of two undercarriage parts comprises a skid 170 connected to the structure to two crosspieces 175 and 176 that are hinged on the structure about an axis parallel to the hinge axis on the structure of the other crosspiece of the same undercarriage part, and at least one component 181 that has a main mechanical and/or hydraulic function, such as a strut, a cross-bracing or control jack, a shock absorber or a shock absorber jack, the component being provided with a device for absorbing energy by plastic deformation and/or for limiting stress, and is connected on the one hand to a crosspiece 176 of the respective undercarriage part and on the other hand either to the corresponding skid 170 or to the structure of the aerodyne.The invention is especially suited to use on helicopters.