Abstract: A microswitch comprises a compression spring abutting onto an insulating base which supports conducting terminals, the spring exerting indirectly a permanent tension force on flexible lateral arms of a blade pivotably mounted on one of the terminals with its free end being movable between the other terminals. The tension force is exerted via a pivoting point on an oscillating lever guiding an applied control force and sliding on the insulating base by one of its ends which is opposite another of its ends which pivotably mounts the lateral arms of the blade and which applies the tension force of the compression spring thereto.

Abstract: The invention relates to a gyrometer, without material rotor, of the type using the Coriolis forces on the particles of a fluid contained in a resonant cavity. It comprises, in addition to the conventional excitation and detection unit, a unit for effecting servo-control in phase of the longitudinal acoustic oscillation in the cavity and employs a weak coupling mode between exciter and cavity. The gyrometer according to the invention overcomes the variations in length of the cavity and the fluctuations in the speed of propagation of the oscillations in the fluid as a function of the temperature.

Abstract: Disclosed is an apparatus for measuring the aerodynamic parameters of an airflow around an aircraft. A streamlined body is rotatably mounted in the airflow such that it aligns itself freely with the flow. Total and static pressure pick-off apertures are provided in the body. The measurement of the true angle of incidence is obtained from two distinct measurements. A first measurement mechanically provides the orientation .alpha.m of the streamlined body relative to the aircraft and the other provides the aerodynamic pressure orientation .alpha.a of the same streamlined body relative to the airflow. The true angle of incidence .alpha. is then determined by summing .alpha.m and .alpha.a.

Abstract: The device according to the invention is intended for controlling the electrical continuity of the equipotential branchings of multi-layer printed circuits. It comprises selectors of a model of printed circuit to be controlled in order to effect, by superposition with the latter, the selection from the assembly E of the conductor elements accessible on at least one of the outer faces of the circuit, of two distinct sub-assemblies Ei and Ec, such that E=Ei+Ec; means for scanning said selectors in order to effect, by displacements in contact with the latter, detection of the defects in continuity; and indicators for translating the state of the electrical continuity in the branchings.

Abstract: The device incorporates two pre-formed bodies made of insulating material that contain a member of electrical connectors and related electrical contact points, mounted coplanar with the electrical contact points of an electromechanical component, the said contact points being connected to one another via one or more flexible printed circuits in such a way that after soldering they finish up connected to each other and rigidly attached to the said component to form a contactor that has the required connections layout.

Abstract: The invention relates to a reader-encoder of an magnetic card, which comprises means for maintaining the support in a fixed and well determined position in contact with read-write means disposed on a carriage moving in a uniform rectilinear movement. It comprises means for orienting the read-write means with respect to the magnetic track of the support and drive means associated with two transmission belts, one elastic, the other rigid. The reader-encoder is employed for magnetic cards used in banks.

Abstract: A device is provided comprising a circuit using the properties of a resonating cavity sensor whose resonance frequency is modified by the electric capacity variations due to the mechanical deformation of a wall under the effect of the pressure to be measured. It uses a single coaxial cable for connecting the sensor to the user circuit and the sensor, through the coaxial cable, is placed in the leg of an impedance bridge providing the value of the standing wave rate characteristic of the difference between the tuning frequency of the cavity and the frequency of an oscillator controlled by this rate.

Abstract: The present invention relates to devices for the quality control of the electrical insulation of printed circuits made in particular in multiple layers superposed on insulating supports of laminar structure by means of conventional or hybrid technologies. To this end, the testing device according to the invention essentially comprises: a specific sensor circuit constituted by a supple insulating screen comprising a plurality of conducting studs with one and only one stud for each conductive printed circuit path; a scanning circuit associated with said sensor circuit comprising a metallized insulating layer having at least two coplanar conducting zones insulated by at least one transverse electrical discontinuity; a measuring apparatus indicative of the galvanic insulation existing between two contiguous conducting zones of said scanning circuit.

Abstract: The present invention relates to a disconnectable electromagnetic eccentric actuator for controlling a mobile member for automatically adjusting a machine. The eccentric actuator comprises a ferromagnetic drive force transmitting screw and nut (of larger diameter than the screw) to convert into axial movement the cycloidal rolling movement of the screw relatively to the wall of the fixed nut, the latter itself forming an integral part of means for converting an electromotive force into a displaceable magnetomotive force whose resultant generated flux causes mutual adhesion, as well as said cycloidal relative movement of the screw and the nut. The screw disconnects when supply current is cut off. The invention is applicable to the automatic control of a flap for regulating the temperature of the intake air in heat engines.

Abstract: A differential pressure gauge comprises a balance beam (3) acting upon a vibrating blade (6). The beam (3) and the blade (6) are disposed in a rigid chamber 4 under vacuum. The beam (3) is acted upon by a force, resulting from the deformation of a flexible or expansible chamber (7) subjected to a pressure P.sub.T and disposed in a second rigid chamber (5) subjected to a pressure P.sub.S. A flexible or expansible seal element (9) isolates the chambers but transmits the forces without disturbing them. This gauge has a high precision and delivers information in digital form, particularly useful in aeronautics.

Abstract: Assembly of a small electric motor is facilitated by pre-assembling each coil with a support bearing and a corresponding pole piece, as well as with the cylindrical magnetic coil housing. Each support bearing includes a pair of radially-extending hooks which engage corresponding edges on the inner bore of each coil to properly align the components. The thusly pre-assembled stator sub-assembly may be inverted to receive the rotor assembly.

Abstract: The register comprises a soft magnetic layer in which is formed the domain propagation channel, a hard magnetic layer and a domain shift conductor. The propagation channel comprises a writing box, a reading box, narrow domain storage zones, widened domain growth boxes, a domain increasing zone, upstream the reading box, which includes intermediate domain increasing boxes, which have a large surface with respect to that of the other growth boxes. Each increasing box comprises lateral shoulders and is not covered by the shift conductor. A coil or a solenoid creates at the level of the increasing zone and of the reading box, a pulsating external magnetic field.

Abstract: Metal section for making a conductor element with double contact face, adapted to be cut into portions, or electrical contacts.This section comprises a base arranged to abut and be fixed on a face of the conductor element, and a body, extending on either side of the base, and having two opposite contact surfaces.

Abstract: The present invention relates to a process for compensating the magnetic disturbances influencing the measurements of a device for determining the magnetic heading, mounted on a land vehicle or aircraft, comprising a magnetometer furnishing analog voltages proportional to the components of the disturbed magnetic field of the earth along its reference axes. It is admitted that the locus of the end of the vector indicative of the field is an ellipse for a land vehicle and an ellipsoid for an aircraft, of which identification from the analog voltages and transformation into a circle or sphere centered at O, origin of the axes of the magnetometer, enable correction coefficients to be calculated which are introduced into the memory of a computer unit associated with the magnetometer in order to define at any instant a vector making with a reference axis of the magnetometer an angle corresponding to the real magnetic heading of the vehicle or of the aircraft.

Abstract: Magnetic memory element for transport ticket or credit card, comprising a support and at least one ferromagnetic layer containing at least one piece of information recorded therein and a layer of a non-magnetic diffuser in contact with the ferromagnetic layer to irreversibly destroy the magnetism of the ferromagnetic layer when the element is heated.

Abstract: A device for measuring the level of a variable signal delivered by a sensor. It comprises a series of attenuators, receiving the signal from the sensor, a squaring and integrating chain for converting the value of the signal delivered by the attenuators into its root-mean-square value, and a recorder. The attenuations are calibrated in dB. The device comprises an AGC circuit, receiving the output signal from the squaring and integrating chain, for switching the attenuators and controlling the recorder. The output signal from the attenuators is maintained constant.

Abstract: Spectrum spread transmission system, particularly for telephone network, employing optical fibres.It comprises, for the emission part, a pseudo-random sequence generator, a multiplier, a transducer for transducing electrical signals into light and, for the reception part, a transducer transducing light into electrical signals, a pseudo-random sequence generator and a threshold detector. Synchronized emission clock and reception clock are provided.

Abstract: In a device for determining the direction of a line of sight, or the orientation of a sighting trihedron associated with said line of sight, defined by a magnetic azimuth angle, an elevation angle and an inclination angle determined in a reference trihedron, a sighting unit defines the sighting trihedron and a gravimetric detector measures components of the gravity acceleration vector in the sighting trihedron. A microprocessor computes the elevation and inclination angles in terms of the components of the gravity acceleration vector, and a magnetometric detector measures components of the earth magnetic field vector in the sighting trihedron. The sighting and reference trihedrons define long and cross axes and the microprocessor computes the components of the earth magnetic field vector along long and cross axes in terms of the components of the earth magnetic field vector. The magnetic azimuth angle is computed in terms of the components along the long and cross axes.

Abstract: The invention relates to a security pneumatic control apparatus comprising an OR cell, an AND cell, a capacitor, connected to the OR cell by means of a debit regulator, and a priority cell connected to the capacitor and to the AND cell. The AND cell comprises a valve member, for engaging two seats, and a diaphragm, for moving the valve member onto one of the two seats. The cross-sections of the diaphragm and of the last mentioned seat of the AND cell are S'.sub.3 and S'.sub.2 respectively. The priority cell comprises a valve member, for engaging two seats, and a diaphragm, for moving the valve member onto one of the two seats. The cross-sections of the diaphragm and of the last mentioned seat of the prioritary cell are S.sub.3 and S.sub.1 respectively. In the invention,S'.sub.3 /S'.sub.2 <S.sub.3 /S.sub.1.When the supply pressures at the OR cell and AND cell are not equal, the security remains guaranteed for the control of dangerous machines.

Abstract: A plug member for the electrical connection of an appliance to a base. The plug member comprises conducting pins, an insulating centering stud and means for locking the plug member on the base. The centering stud is open laterally. The locking means are disposed in the centering stud for projecting therefrom to engage the wall of a centering hole in the base.