Abstract: The shock absorber comprises a strut, a sliding rod slidably mounted relative to the strut and co-operating therewith to define both a shock absorbing chamber and a raising chamber which is connected to a member for feeding it with raising liquid, a dip tube defining a lowering chamber and connected to a member for feeding it with a lowering liquid, and in which a lowering piston is disposed, which piston has one face in contact with the shock absorbing liquid, and an anti-crash tube mounted to slide relative to the sliding rod and including an energy-absorbing member.

Abstract: The invention relates to raisable landing gear including a shock absorber having a strut and a sliding rod, together with a two-alignment hinged side-brace. According to the invention, unlocking means are provided to break the secondary alignment, thereby breaking the main alignment while the landing gear is being raised, said means being essentially constituted by a lever mounted to rotate on one of the arms of the main alignment, and by a motor and gear box assembly for driving said rotary lever in rotation and further including an unlocking arm that, when said motor and gear box assembly is in action, co-operates with the lower arm of the secondary alignment to break said secondary alignment. Return means are also associated with the rotary lever to ensure that it returns to its initial position when the landing gear is raised.

Abstract: The invention relates to raisable landing gear having a shock absorber strut and a sliding rod. According to the invention, the landing gear includes a lateral stabilizer hinged to the strut and fitted with a wheel at its free end, together with mechanical coupling means associated with said lateral stabilizer, in such a manner that: firstly lowering the landing gear deploys the lateral stabilizer so that its wheel, when the landing gear is in its lowered position, provides support additional to that provided by the wheels of the wheel set, and also constitutes a lateral stabilizer proper during taxiing of the airplane; and secondly raising the landing gear folds the lateral stabilizer so as to enable the entire landing gear assembly to be housed when in the raised position. It then becomes possible to organize the landing gear beneath the fuselage of the airplane, thereby making it possible to obtain landing gear that is extremely short.

Abstract: The locking device comprises a first hook cantilevered out from a rocking pin to support a catch member and bearing against a retractable locking member that opposes rocking movement of the first hook, and a second hook adjacent to the first hook and associated therewith by a link member so that when the first hook is closed, the second hook is kept in a position close to a position in which the second hook supports the catch member.

Abstract: In the preferred embodiment, the device comprises a body, a sliding rod mounted to slide inside the body, and a control rod including both compression and expansion end-of-stroke abutments associated with a control piston for displacing the control rod to a position which is retracted or extended relative to the body. The stroke c of the sliding rod is greater than the distance d between the compression end-of-stroke abutment and an immediately adjacent end of the corresponding chamber when the control rod is in an extended position.

Abstract: A device for controlling the braking of a wheel train is disclosed and includes an actuating mechanism for alternating actuating symmetrically disposed groups of wheel brakes, temperature sensors disposed or at least one wheel brake in each of the groups of wheel brakes with the control mechanism actuating the coolest group of wheel brakes several times when the temperature difference between the groups of wheel brakes reaches a threshold temperature difference and for actuating the groups of wheel brakes cyclically so long as the threshold temperature difference is not reached.

Abstract: The locking device of the invention comprises a locking device mounted to pivot relative to a beam and having ends associated with an axle to lock the axle in a first position of the locking device and to release the axle by the locking device pivoting towards a second position, together with a control actuator and a set of two links for controlling the position of the locking device.

Abstract: The rotary machine of the invention includes a series of cylindrical chambers swept by pistons in hydraulic liquid admission-and-discharge cycles and alternately connected to high pressure openings and to low pressure openings during each revolution of the machine, wherein said machine it includes a pre-discharge opening disposed between the high pressure opening and the low pressure opening in that order relative to a direction of rotation of the machine, and wherein the pre-discharge opening is connected by a connecting duct to rotary support devices to cause hydraulic fluid to pass through the rotary support devices.

Abstract: A shock absorber of the invention comprises a strut, a inner cylinder fixed to the strut and extending inside the strut, and a sliding cylinder mounted to slide inside the strut and associated with the inner cylinder to communicate with the inside thereof via throttling orifices and short-circuit orifices, a pump and control arrangement being provided to pump hydraulic liquid from the sliding cylinder into the inner cylinder so as to produce a retraction of the sliding cylinder into the strut when both the throttling and short-circuit orifices are closed. The throttle orifices produce a communication between the sliding cylinder and the inner cylinder which produces a normal damping operation of the strut while the short-circuit orifices provide a rapid release of the sliding cylinder from a retracted position and a control member selectively closes one or both of the orifices.

Abstract: A retractable landing gear is arranged so as to provide, in use, a highly inclined shock absorber while avoiding high shearing stresses on the shock absorber. The landing gear includes a pivoting panel fixed to an aircraft structure to pivot about a raising axis; a shock absorber including a strut fixed to the pivoting panel so as to pivot relative thereto about a tilt axis, and a sliding rod mounted to slide in the strut and carrying a set of wheels at its bottom end; and a coupling member connected to the pivoting plate and to the bottom end of the sliding rod. Also included is a mechanism for raising and holding the landing gear.

Abstract: The wheel of the invention comprises a rim and side walls made of composite material and removable beading on at least one side and preferably likewise made of composite material. The beading is mounted on the rim via a metal mounting belt which is fixed to the rim.

Abstract: The steering apparatus of the invention comprises a body (4) containing a crank (8) with actuators (12) associated with the crank and free to pivot about respective pivot axes (14). The actuators co-operate with distribution members including feed circuits and return circuits carried by the body and opening out facing at least one actuator face (16) extending perpendicularly to the pivot axis (14) of the actuator, the face including at least one control orifice (17).

Abstract: The landing gear of the invention comprises a strut in which a sliding rod slides, the strut and the sliding rod are connected to each other by a scissors linkage having a top branch and a bottom branch which are connected to each other by articulated means capable of moving between a folded position in which the branches of the scissors linkage are adjacent to each other, and an unfolded position in which the branches of the scissors linkage are moved apart from each other, thereby causing the sliding rod to pivot about its own axis.

Abstract: The system in accordance with the invention provides braking while an aircraft (1) is being towed on the ground by a tractor vehicle (2) which is mechanically connected to the aircraft and which is fitted with a brake device under the control of a brake pedal (27), with the aircraft being fitted with a braking circuit. The system comprises a towing brake member (7) disposed in the aircraft's braking circuit line (34) for connecting the brake control member (27) of the vehicle to the towing brake member (7) of the aircraft.

Abstract: A pulse generator in which a magnetic circuit is closed by a portion of a wall (5) of a cylindrical part rotating about its axis and coupled at one of its ends to a drive member (7). The wall portion and a fixed part (1) together define an air gap which varies depending on the relative angular positions of the wall portion and the fixed part such that during rotation magnetic field variations are generated at a frequency proportional to the speed of rotation of the rotating part. The generator includes an electrically conductive winding (4) in which the field variations generate electrical pulses, and the rotating cylindrical part (5) includes at least one longitudinal slot (8).

Abstract: A device for steering the wheels fitted to the bottom end of the leg (1) of the nose landing gear of an aircraft, the wheels being steered about the axis of the leg, the leg (1) comprising a strut (2) hinged to the structure of the aircraft, a tube (4) mounted to rotate inside the strut (2) and projecting outside the strut, a rod (5) slidably mounted inside the tube (4) and carrying the wheels at its free end, and a scissor linkage (6) for constraining the tube (4) and the rod (5) to rotate together.

Abstract: The shock absorber of the invention comprises a struct (1) in which a sliding rod (4) is mounted, with an annular chamber (17) being defined between the strut and the sliding rod. According to the invention, the shock absorber includes at least one support bearing (10) between the strut and the sliding rod in the vicinity of the opening (3) in the strut, and a sealing bearing (12) at a distance from the support bearing (10) and disposed at a level which corresponds to the top portion of the sliding rod when the shock absorber is in its extended position, with the sealing bearing (12) also having a side which is in contact with the annular chamber (17) and spporting at least two sealing rings (14) which are separted by a groove (13) which is connected to the annular chamber via a balance channel (16) capable of being closed by a cock (19).

Abstract: A control mechanism according to the invention comprises a crank (13) constrained to rotate with the catapult bar (10), a catapult bar linkage comprising a link (14) and a lever (16) which are hinged to each other, and having a first end hinged to the crank (13) at a point distant from the pivot pin of the catapult bar, and a second end hinged about a pin (17) carried by the landing gear and distant from the pivot pin (11) of the catapult bar (10), and control means (18) for controlling the relative disposition of the link and the lever.

Abstract: Landing gear comprising a pivoting strut (1) receiving the rod of a shock absorber (2) which projects downwardly from the strut and is movable in an axial direction (3) relative thereto, a rocking beam (4) mounted to tilt at the bottom end of the shock absorber rod (2) and supporting leading and trailing wheel sets (6), a torque linkage comprising a top branch (7) and a bottom branch (8) which are hinged to each other, the top branch (7) being hinged to the strut (1) and the bottom branch (8) being hinged to the rocking beam, and locking means (9, 15) for limiting a downwards pivot movement of the top branch (7) of the torque linkage while the shock absorber rod (2) is not fully extended.

Abstract: A carbon disk brake rotor (1) has n trapezium-shaped drive notches (3) around its periphery and a plurality of reinforcing riders (2), with the drive faces (6) of each notch (3) being at an angle A of (360/2n) degrees relative to the midplane (3a) of the notch, and with the riders (2) completely covering the projecting portions (7) between consecutive notches (3) which have parallel fitting faces (9).