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| Number | Title | Issue Date |
| 7368158 | Elastomeric member provided with monitoring means The present invention relates to problems of maintenance of elastomeric members. According to the invention, the elastomeric member is provided with at least one elastomeric layer 1 disposed between two rigid strength members 2. In addition, the elasto... | 05/06/2008 |
| 7360994 | Method of controlling vibration damping in a helicopter, and apparatus implementing the method The present invention relates to a method of controlling a drag damper for a helicopter blade under all operating configurations of the helicopter, the method consisting in: a) measuring the elongation of the damper; | 04/22/2008 |
| 6966755 | Compressor airfoils with movable tips Aspects of the invention relate to a compressor system for a turbine engine that not only allows for larger compressor blade tip clearances as the engine passes through non-standard operating conditions, but also minimizes clearances during normal engine operation, ... | 11/22/2005 |
| 6926500 | Fluid inertia drag damper for rotary wing aircraft rotor A drag damper for use on a rotary-wing aircraft rotor comprises a body defining two variable volume chambers linked by a piston. The chambers filled with fluid in the damper are connected by a restrictor port in the piston or between the latter and the body, and via... | 08/09/2005 |
| 6764280 | Multi-bladed tail rotor hub design for coriolis relief A multi-bladed tail rotor assembly is disclosed that provides higher aerodynamic performance, damage tolerant design with 10,000-hour life expectancy, and which requires low maintenance through the use of composites and elastomerics. The tail rotor hub assembly incl... | 07/20/2004 |
| 6695583 | Snubber-vibration damper system for a bearingless main rotor A flexbeam rotor system includes an intermediate tube and a torque tube that envelopes a flexbeam in spaced relation thereto. The torque tube is connected to the flexbeam at its radially outer end and articulately connected to the intermediate tube throug... | 02/24/2004 |
| 6260676 | Magnetic particle damper apparatus A magnetic particle damper apparatus is provided for damping motion between two relatively movable members. The damper apparatus comprises first and second conductor members each attachable to one of the relatively movable members. The conductor members a... | 07/17/2001 |
| 6200097 | Hub for rotor head of rotary-wing aircraft and rotor head with such hub A hub for the rotor head of a rotary-wing aircraft having a plurality of blades radially linked to the hub by a blade root provided with a rigid hub includes spherical stops associated with the blades, which stops have an inner armature linked to the root... | 03/13/2001 |
| 6196800 | Rotor blade for a bearingless rotor of a helicopter A rotor blade arrangement for a bearingless rotor of a helicopter includes a flexbeam connecting an airfoil blade to a rotor head, and a control sleeve surrounding the flexbeam. The control sleeve is relatively stiff, but the flexbeam has portions that ar... | 03/06/2001 |
| 6082968 | Centrifugally activated variable damper assembly A centrifugally activated variable damper assembly for a stopped-rotor aircraft is disclosed for adjusting dampening level of teetering motions produced by the rotors during the in-flight conversion process from rotary-wing to fixed-wing flight, or vise v... | 07/04/2000 |
| 6050778 | Semi-articulated rotor system A semi-articulated stiff-in-plane (SASTIP) rotor hub is provided. The hub includes a cylindrical composite shell (12). A plurality of flexure mount assemblies (16) are positioned around the periphery of the hub shell. Each flexure mount assembly includes ... | 04/18/2000 |
| 5951252 | Helicopter flap lock assembly A flap lock device for restraining the flapping movement of a main rotor blade assembly on a helicopter. The flap lock device includes an first elongate frame member which extends between a first end and a second end and second elongate frame member which... | 09/14/1999 |
| 5951251 | Device for locking the blades of a rotor, at least in terms of pitch The locking device comprises, for each blade, at least one first subassembly with a fork for locking a finger, one of the fork and finger pivoting on a chassis attached laterally to the hub between the linking members of two neighboring blades, the other ... | 09/14/1999 |
| 5913659 | Apparatus and method for adjusting rotor blade tracking A helicopter rotor has two or more blades which extend from a hub and has an adjustment mechanism for adjusting the lead/lag variation of the blades which typically occur due to manufacturing tolerance variations or to changes which occur through operatio... | 06/22/1999 |
| 5877566 | Submersible magnetic motor having improved rotary blades A submersible magnetic motor having improved rotary blades comprising a magnetic motor body, a magnetic rotor and a rotary impeller wherein the rotary impeller comprises a rotary hub provided with a plurality of blades which are uniformly distributed and ... | 03/02/1999 |
| 5636970 | Device for damping the drag of the blades of a rotor The device comprises, between two blades and their members linking them to the hub, three levers articulated by ball joints to the members and to the hub, the two levers pivoting on the third one about axes of pivoting parallel to each other and perpendic... | 06/10/1997 |
| 5372478 | Helicopter rotor damper A hollow rotor hub is provided at the top of the rotor shaft for a multi-bladed helicopter. The blades being mounted to the rotor hub on spherical elastomeric bearings which provide for coincident rotor blade hinges for blade pitch, flap and lead-lag moti... | 12/13/1994 |
| 5267833 | Gyrocraft rotor hub body Gyrocraft rotor hub body (1) in which each blade (2) is linked to the body (1) by articulations and linking members the body includes two strong elements (7, 8) whose planes are substantially parallel to each other and perpendicular to the axis of the mas... | 12/07/1993 |
| 5141398 | Rotary, viscoelastic drag elastic-return and damping device for a rotorcraft rotor blade The invention relates to a drag elastic-return and damping device (28) for a blade, and a rotor head including it. The device (28) comprises a connecting rod (30) connected to the blade and transmitting its drag movements to a rotary member (29) for elastic re... | 08/25/1992 |
| 5116209 | Device of retractable stops for rotor blades of giroplanes, and rotor head including such a device A device of retractable stops for the blades of articulated rotors for giroplanes, which includes a stationary stop 20 with a finger 22 radially converging towards the exterior and externally radially protruding on the external spar 9 of the articulation ... | 05/26/1992 |
| 5007799 | Flapping restrainer device for rotorcraft rotor blades, and rotor head comprising said device The invention relates to a flapping restrainer device for the blades of a rotorcraft main rotor, and a rotor head comprising the same. The lower restrainers comprise a reciprocal star-shaped plate (32), having as many radial branches (33) as blades, and e... | 04/16/1991 |
| 4915585 | Rotary-wing aircraft rotor head having resilient-return interblade ties with built-in damping The invention relates to a rotor head having interblade ties with resilient return in lag and with built-in damping, wherein each tie is connected, to each of the two rotor blades joined by it, by articulation means comprising a main ball retained on a me... | 04/10/1990 |
| 4652211 | Helicopter rotor Helicopter rotor on which each blade is connected in articulated manner to a center hub by means of a fork the vertical plane movement of which, at rotor speeds below a given set value, is limited by a pair of limit rocker arms located between the hub and... | 03/24/1987 |
| 4588356 | Helicopter rotor Helicopter rotor on which a number of blades are each connected to a perimetrical bridge element on a hub by means of a fork element extending round the said bridge element and connected to it by means of two elastomer supports, arranged in series, of whi... | 05/13/1986 |
| 4549850 | Helicopter rotors A bearingless helicopter rotor includes an integral damper and pitch change assembly (16) adapted to damp lead/lag movements of a rotor blade and to change the pitch of the rotor blade. In described embodiments, the assembly includes a generally tubular b... | 10/29/1985 |
| 4502652 | Process and apparatus for suppressing external load carrying wing flutter for aircraft In a semi-active system for suppressing external load-carrying wing flutter in aircraft, the carrying wing (1) is provided with one or more external loads (2), and the suspension of the external load (2) on the carrying wing (1) about an axis is arranged ... | 03/05/1985 |
| 4424451 | Water turbine The water turbine of the present invention includes a housing defining a generally cylindrical chamber therein defining a laterally extending opening. Rotatably positioned within the chamber is a rotor including a plurality of folding wings or vanes exten... | 01/03/1984 |
| 4342540 | Articulated rotor for helicopters The multi-blade articulated rotor for helicopters, comprises a hub connected to a shaft rotatable substantially about a vertical axis, the hub being in the form of a plate comprising a plurality of perforations, each of which defines a bridge of material ... | 08/03/1982 |
| 4297079 | Variable pitch marine propeller A variable pitch marine propeller having a plurality of circumferentially spaced apart blades mounted on axles at the root portion of the blades in a hub to permit independent movement of each of the blades about an axis of rotation substantially parallel... | 10/27/1981 |
| 4178130 | Helicopter rotor having lead-lag damper operable with pitch and flap decoupling A helicopter rotor having at least one blade projecting from the central hub and mounted for pitch change, flapping and lead-lag motion and including a lead-lag damper mounted to be pivotally movable in a selected plane and connected to the blade through ... | 12/11/1979 |
| 4105365 | Helicopter rotor lead-lag damper A helicopter rotor lead-lag hydraulic fluid damper has an internal anti-torque shaft preventing rotary motion of the dynamic fluid retaining seal. An independent fluid reservoir under centrifugal force supplies lubrication to the low pressure side of the ... | 08/08/1978 |
| 4086024 | Apparatus for connecting a rotor blade to a rotor hub A rotor blade is connected to a rotor hub, for example, in a helicopter, by t least one pair of damping elements and by a blade connector bolt. The damping elements comprise metal discs and layers of elastomeric material arranged in sandwich fashion. The d... | 04/25/1978 |
| 4028000 | Blade connection for helicopter rotor blades Resilient drive means for a helicopter rotor blade. The rotor blade is pivotally supported on a stub shaft which is in turn supported on the rotor hub. First means are fixed to the rotor blade and second means fixed to the stub shaft with resilient and ad... | 06/07/1977 |
