Abstract: The invention relates to an architecture for a hydraulic system for operating the landing gear of an aircraft including at least one pressure source and at least one hydraulic return, the system having a hydraulic circuit comprising a first hydraulic line that, when pressurized, causes the landing gear to be lowered, and a second hydraulic line that, when pressurized, causes the landing gear to be raised, said lines being selectively pressurized by means of a hydraulic distribution member comprising at least an isolation valve and a selector for putting one of the lines into communication with pressure and the other line into communication with return.

Abstract: The invention relates to a method of servo-control in a vehicle brake system including at least one electric brake having at least one actuator comprising a pusher facing friction elements and driven by an electric motor to apply a force selectively against the friction elements in response to a braking setpoint, the method making use of a plurality of relationships between various operating parameters of the actuator including a relationship between a pusher position and a corresponding force applied by the pusher to the friction elements. According to the invention, the method comprises the step of adjusting a particular relationship between position and force.

Abstract: The invention relates to a method of servo-control in a vehicle braking system that includes at least one electric brake provided with at least one actuator comprising a pusher facing friction elements and driven by an electric motor to apply a force selectively against the friction elements in response to a braking setpoint, the method making use of a relationship for transforming a setpoint for the braking that is to be applied by the pusher into a setpoint for the position of the pusher. The method of the invention includes the step of adjusting a particular relationship by imposing pauses in the position of the pusher.

Abstract: An apparatus for preventing untimely braking, which apparatus is specially adapted to an electromechanical brake including at least one actuator having a pusher suitable for being moved by an electric motor controlled by a control module so as to press a stack of disks in controlled manner, The apparatus is provided with a power switch disposed on a power line for powering the electric motor of the actuator, the power switch being controlled by a control logic circuit that places the power switch by default in an open state, and that places the power switch in a closed state only in response to a braking confirmation signal not coming from the control module of the actuator and independent therefrom.

Abstract: The invention relates to a method of managing the braking of an aircraft while taxiing on an airport, the method comprising, on the basis of characteristics for a sequence of movements of the aircraft along at least one given path to be followed by the aircraft on the airport, the step of deducing information concerning the braking to be performed so that the aircraft does indeed travel in application of said sequence of movements.

Abstract: The invention relates to an assembly comprising at least one hydraulic control valve and a body for receiving said hydraulic control valve, the hydraulic control valve including flow orifices and flow control means for putting the flow orifices selectively into hydraulic communication with one another. The hydraulic control valve is in the form of an oblong cartridge, the body includes an open housing adapted to receive the hydraulic control valve in removable manner such that when the hydraulic control valve is in place in the housing, the hydraulic control valve and the housing together define isolated hydraulic chambers into which the flow orifices of the hydraulic control valve open out.

Abstract: The invention relates to an electrical power distribution architecture specially adapted for actuating in sequence aircraft moving elements such as doors, undercarriages, or high-lift elements, said moving elements being actuated by electromechanical actuators powered in sequence from electrical power delivered by at least one electrical power bus of the aircraft. According to the invention, the architecture comprises at least one power distribution member comprising: calibrator means for calibrating the electrical power coming from the power supply bus of the aircraft; and switch means for selectively directing the calibrated electrical power to one or the other of the electromechanical actuators.

Abstract: A part of a CVI/CVD furnace in which a heating system for heating the furnace is located is isolated from a remaining part of the furnace exposed to a reactive gas present therein. The shell of the furnace may for example be provided with a dividing wall or the like to provide a physical separation. In addition, an inert gas such as argon or nitrogen is supplied to the heating zone containing the heating system so that part of the furnace is at positive pressure differential compared to the part in which the reactive gas is present. As a result, the reactive gas is retarded from contacting the heating system which could, among other things, cause deposits to form thereon. More generally, the control of reactive gas flow in the furnace is better controlled.

Abstract: A wheel assembly for a vehicle, includes a wheel rim (16) and a tire (18) defining a closed space (30) therebetween which is filled with a pressurized gas. The inventive wheel assembly also includes a pressurized-gas reservoir (40) and elements (50) for selectively connecting the pressurized-gas reservoir (40) to the closed space (30) defined between the wheel rim (16) and the tire (18). The pressurized-gas reservoir (40) is rotationally fixed to the wheel rim (16).

Abstract: A pipe for feeding a gas into an oven, a furnaces, or the like (such as a CVI/CVD oven), and in particular into a reaction chamber structure inside the oven, is provided with a gastight tubular sealing device extending radially outside the pipe and defining a path that is practically gastight, along which there extends the as feed pipe. The tubular sealing device is preferably at least partially flexible in the transverse direction and/or the axial direction so as to accommodate positioning defects between a location situated in the reaction chamber and a location where the gas feed pipe penetrates into the oven (which defects may be due, for example, to asymmetrical thermal expansion/contraction).

Abstract: Radio-frequency transmission device comprising a transmission antenna (2) and a receiving antenna (4), characterised by comprising one or more passive resonant circuits (5) positioned between the transmission and receiving antennas (2, 4).

Abstract: The present invention provides a method of fabricating an annular fiber structure, the method comprising the steps consisting in: providing a first fiber sheet made up of substantially unidirectional elements; forming a transverse, first annular sheet by laying the first fiber sheet in alternation in one direction and in the opposite direction between coaxial outer and inner circular rings with the sheets being held at said rings; providing a second fiber sheet made up of substantially unidirectional elements; forming a circumferential, second annular sheet by depositing the second fiber sheet in a circumferential direction between said outer and inner rings; bonding the transverse and circumferential annular sheets to each other; and driving the transverse and circumferential annular sheets in rotation about the axis of the outer and inner rings so as to perform a plurality of complete revolutions in order to obtain a thick annular fiber structure having layers made up by the transverse sheet alternating wit

Abstract: The invention relates to a telescopic actuator comprising a cylinder in which a main rod is mounted to slide telescopically along a sliding axis between a retracted position and an extended position. The actuator includes an auxiliary rod mounted to slide telescopically in the main rod along said sliding axis between a retracted position and an extended position, the actuator including controlled retaining means for retaining the auxiliary rod in the retracted position inside the main rod.

Abstract: The invention relates to a method of fabricating a composite material connecting rod, the method comprising the step of cutting out a pattern presenting two opposite edges from a composite fiber fabric made up of a plurality of superposed primary plies that are bonded together in such a manner that the primary plies can slide relative to one another, rolling the pattern into a tube in such a manner that the primary plies slide relative to one another to give a chamfer shape to the two edges, and joining together the chamfer-shaped edges so that they overlap.

Abstract: The invention relates to a device for providing protection against untimely braking, the device being specially adapted to an electromechanical brake including at least one actuator having a pusher suitable for being displaced by means of an electric motor controlled by a control module so as to press in controlled manner against a stack of disks, in which the device comprises a safety member suitable for being placed in a first state in which it prevents the pusher from being displaced by the electric motor, and a second state in which it leaves the pusher free to be displaced by the electric motor, the safety member being controlled by a control logic circuit which by default places the safety member in the first state and places the safety member in the second state only in response to the simultaneous presence of an order coming from the control module and a confirmation signal that does not come from the control module and that is independent thereof.

Abstract: A landing gear includes a shock absorber having first and second elements slidable relative to each other, the slidable elements defining an inside volume which is filled in part with hydraulic fluid so as to leave a first chamber filled with gas under pressure and located at the end of one of the slidable elements. A vessel filled with gas under pressure is housed in the end and is provided with a shutter member that is initially in a closed state and that is suitable for taking up a stable open state when the pressure in the first chamber exceeds the pressure in the vessel by a predetermined threshold amount.

Abstract: The invention relates to an actuator comprising two drive motors (14A, 14B), an outlet (22), a differential reducer (16) with spur teeth and a torque limiter (18), the latter two components being disposed between the two motors (14A, 14B) and the outlet (22). According to the invention, the torque limiter (18) is built into the differential reducer (16). The invention can be used to anchor a landing gear.

Abstract: A transverse fiber sheet is lapped by being guided in a substantially radial direction back and forth along a path between circumferentially outer and inner edges of the sheet, with the transverse sheet being reversed at each end of its path, the width of the transverse sheet being narrowed between the outer circumferential edge and the inner circumferential edge, the transverse sheet being held in place as it is lapped. Substantially mutually parallel yarns or tows are pulled to form a helical longitudinal sheet of density per unit area that decreases between its outer edge and its inner edge. The transverse sheet and the helical longitudinal sheet are superposed and advance continuously in flat rotation, and they are assembled together to form a helical sheet which is removed.

Abstract: An improved clutch or brake device in which at least two members are mounted for relative rotation and engagement, the members having friction material rotatable therewith, and the friction material of the members having surfaces confronting each other, characterized in that the friction material has a solid density of greater than 30% and includes an open lattice of carbon ligaments forming a network of three dimensionally interconnected cells; and a pyrolytic carbon coating on the open lattice of carbon ligaments.

Abstract: The invention relates to a method of managing the operation of a seat (10) fitted with an actuator (24) including means (42, 44) for monitoring at least one variable characteristic of the force produced by the actuator (24), means (41) for measuring the position of the actuator, and means (36) for controlling the actuator, the method comprising the steps consisting in: measuring the or each characteristic variable; evaluating the or each characteristic variable on the basis of a predetermined evaluation criterion; and while the actuator is in operation, implementing an appropriate action on the seat as a function of the result of said evaluation. Said evaluation comprises a step of measuring the position of the actuator. Said evaluation criterion for the or each measured characteristic variable as used for said evaluation depends on the position of the actuator.