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| Number | Title | Issue Date |
| 7396203 | Spacer arrangement A spacer arrangement 1, 40 is provided in which wedges 5, 6; 45, 46 are arranged to have an interface 7, 47 between them such that a thermally variable member 8, 48 can cause relative motion between the wedges 5, 6; 45, 46 to adjus... | 07/08/2008 |
| 7326032 | Cooling fan with adjustable tip clearance A cooling fan comprising a fan housing and a plurality of blades rotatably disposed within a conduit through the fan housing. Each of the plurality of blades extends radially outward from a hub to a tip. The radial gap between the tips of the blades and the conduit ... | 02/05/2008 |
| 7270516 | Non-articulated rotor and rotorcraft comprising a rotor of this type A hingeless rotor, in particular for a rotorcraft, comprising: a rotor head, a rotor mast having a rotor axis, a torque-transmission element nonrotatably joined to the rotor mast, at least one rotor blade, and a rotor-head-side rotor-blade connector having a centrif... | 09/18/2007 |
| 7198224 | Energy absorbing airframe for a vertical lift vehicle An airframe includes an energy absorbing structure with a frame, a beam mounted to the frame at a rotational joint and a collapsible member. In response to reaching a predetermined threshold load value during a high sink rate impact event, the collapsible member wil... | 04/03/2007 |
| 7040863 | Variable pitch rotor blade for shrouded rotors, in particular helicopter rotors The blade includes a current part (1) having an aerodynamic profile enclosing a spar (7) and extending from blade tip (4) to a blade root (3) provided with a pitch sleeve (21), through which twisting arm (6) passes and protr... | 05/09/2006 |
| 6559370 | Submarine countermeasure vehicle with folding propeller A submarine countermeasure vehicle includes an elongated body for supporting a countermeasure device, and a propulsion assembly mounted on an after end of the body. The propulsion assembly includes a rotatable propeller hub, propeller blades mounted on th... | 05/06/2003 |
| 6155784 | Variable pitch aircraft propeller A propeller for aircraft has a tip-to-tip flex-beam spar and torsionally stiff hollow blades bonded to the spar throughout an outer portion of the blades. The spar has two end caps which are separated from each other at the hub and converge in the outer p... | 12/05/2000 |
| 6033182 | Swash-plate device for controlling the pitch of rotor blades with non rotating plate stop track and pin The non-rotating plate of the device is stopped from rotating around the rotor axis by a stop arm with at least one rigid stop track extending substantially axially and secured to the structure of the rotor aircraft. The track works together with a stop p... | 03/07/2000 |
| 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 |
| 5853145 | Rotor head for rotary wing aircraft A flexible beam rotor assembly for an aircraft includes a rotor spar having an axis of rotation and a hole through which the axis of rotation passes. A spindle has a teetering connection to the rotor spar, the teetering connection having a teetering axis ... | 12/29/1998 |
| 5460487 | Pitch adjustment assembly for bearingless main rotors A pitch adjustment assembly (100) for a bearingless rotor assembly (20) which includes a torque tube member (36) enveloping a flexbeam connector (22), which torque tube member (36) defines a geometric center (120) and is operative to impart pitch motion t... | 10/24/1995 |
| 5364230 | Rotor blade subassembly for a rotor assembly having ducted, coaxial counter-rotating rotors A rotor blade subassembly for a rotor assembly having ducted, coaxial counter-rotating rotors includes a flexbeam, an integrated torque tube/spar member, and an aerodynamic fairing or rotor blade. The flexbeam is a laminated composite structure that react... | 11/15/1994 |
| 5304036 | Autogyro aircraft An autogyro aircraft has freewheeling rotor blades that provide lift. A separate pusher propeller provides forward thrust. The rotor system (20) has a collective arm (30) as a control for selectively setting and maintaining a tension force on a collective... | 04/19/1994 |
| 5249925 | Variable-pitch multi-blade rotor, in particular for the rear anti-torque system of a rotating wing aircraft A variable-pitch multi-blade rotor for use as the anti-torque rear rotor of a rotating wing aircraft has a rotor with a central shaft rotated about a central axis, a hub constrained to rotate with the central shaft about the central axis, blades distribut... | 10/05/1993 |
| 5096381 | Regulating device for maintaining constant the rotary speed in turbines The invention relates to a regulating device for maintaining constant the rotary speed in turbines of the type comprising a turbine hub and a number of turbine blades which are axially, but rotatably connected to the hub and have such a shape and are so a... | 03/17/1992 |
| 4881874 | Tail rotor A helicopter tail rotor (10, 130) includes a drive mast (12) having an axis of rotation (14). A first blade pair (20) is mounted for rotation about the drive mast (12). The first blade pair (20) includes a pitch change axis (54) perpendicularly disposed t... | 11/21/1989 |
| 4828458 | Auxiliary helicopter rotor An auxiliary helicopter rotor on which at least two blades extend radially from a hub, each of which blades presents a root connecting it to the hub, and a beam having two wings extending respectively along the back and face of the blade; the wings of the... | 05/09/1989 |
| 4792280 | Helicopter rotor flexbeam An improved helicopter rotor flexbeam (20) comprises a pair of generally parallel outwardly open, cross-sectionally C-shaped beams (25) of a geometry which defines therein a first inboard region (A) of enhanced out-of-plane flexibility and a second outboa... | 12/20/1988 |
| 4789305 | Self-feathering rotary wing A controllable lifting rotary wing for an aircraft wherein each rotor blade is mounted in such a manner that it has freedom to oscillate in pitch about its feathering axis. The aerodynamic center on each rotor blade is displaced forward of this feathering... | 12/06/1988 |
| 4786236 | Rotor, especially for rotary wing aircraft A helicopter rotor with foldable blades has, in the hub and blade roots, holes for mounting the blade roots to the rotor hub with connecting bolts passing through these holes in the operating position of the blades. Additionally, at least one blade of two... | 11/22/1988 |
| 4778340 | Main helicopter rotor A main helicopter rotor on which a rotary tubular shaft supports, at its top end, an annular hub integral with the tubular shaft itself. The assembly consisting of the tubular shaft and the hub is closed off at the top by a bell connected in removable man... | 10/18/1988 |
| 4778343 | Rotor structure, especially for a rotary wing aircraft In order to avoid a negative coupling between blade lead-lag movements and lade angle adjustment movements in a helicopter rotor, the angle (ଲ) between a control rod (5) for the blade angle adjustment and an effective damping plane (M) of the rotor i... | 10/18/1988 |
| 4741671 | Metal hub for a helicopter rotor Metal hub for a helicopter rotor, on which a metal center element is connected to an outer annular frame for anchoring the rotor blades by use of a number of identical metal spokes connected, at one end, to the center element and each acting, at the other... | 05/03/1988 |
| 4708591 | Bladed aircraft rotor with flexible blade mountings A bladed aircraft rotor is disclosed having blades mounted by means of flexible devices providing freedom for blade motions, at least in the flapping sense and in the pitch-change sense, without employment of flapping or pitch bearings or pivots, the roto... | 11/24/1987 |
| 4695227 | All composite, constant speed universal joint for use in a shaft driven tiltable main rotor for a helicopter A universal joint for use in a pitch cone rotor system in a helicopter is comprised of crossed lift beams, one beam of which is coupled to the rotor hub and the other beam of which is coupled to the driven rotor shaft. The two crossed lift beams are coupl... | 09/22/1987 |
| 4690615 | Rotor, especially for rotary wing aircraft A rotor, especially for rotary wing aircraft, has a rotor hub (1) with one r more torsionally stiff rotor hub arms (1.1) projecting radially outwardly. A rotor blade (2) having a blade root (2.1), a blade wing section (2.3), and a torsionally flexible blad... | 09/01/1987 |
| 4650401 | Flat strap cruciform flexure for helicopter rotor systems An improved flexure member in a helicopter rotary system is devised wherein the flexure member is made of wound monofilamentary resin impregnated material comprising a fiber matrix and is formed in a flat strap disposed through a rotary hub of the rotor s... | 03/17/1987 |
| 4616977 | Hubless, hingeless and bearingless helicopter rotor system A helicopter rotor system in which a plurality of rotor blades are attached to the rotor mast. Each blade has a spar formed of fibers bundled and bonded together inside a skin. These fibers are divided into two bundles, each of which has a bight with a be... | 10/14/1986 |
| 4611971 | Device comprising cyclic plates driven by flexible blades, for controlling a helicopter rotor 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 ro... | 09/16/1986 |
| 4592701 | Rotor blade, especially for a rotary wing aircraft A rotor blade, for example for a rotary wing aircraft, has a wing section d a root section interconnected by a neck section surrounded by a blade angle adjustment sleeve which is stiff against torque moments for transmitting blade angle adjustment movemen... | 06/03/1986 |
| 4585394 | Apparatus for adjusting the tracking of the blades in a rotor, especially for a rotary wing aircraft The blade angle of the blades is adjustable in a rotor for a rotary wing craft by a lever mechanism (13, 14 or 41, 42) secured to the radially inner end of an extension bushing (7; 7.1) or shaft (43). The extension bushing (7; 7.1) or shaft (43) is conne... | 04/29/1986 |
| 4582013 | Self-adjusting wind power machine A machine for economical recovery of wind power employs a self-adjusting mass-balanced aerodynamic blade weathervaning freely around a lengthwise pitching axis forward of its aerodynamic center, and an aerodynamic roller in its leading edge, spun at high ... | 04/15/1986 |
| 4580945 | Helicopter gimbal rotor Rotor tilt is permitted by two spherical elastomeric bearings, one above a hub member and one below, that have coincident centers at a tilt point (P) on the rotorshaft axis which is below the rotor plane. Positive rotor thrust is reacted by the upper bear... | 04/08/1986 |
| 4566856 | Helicopter gimbal rotor Hub moment for a tilt rotor is provided by U-shaped springs that extend outwardly from the rotorshaft and in-plane with the tilt point (P) and inwardly to the tiltable hub member in the rotor plane, which is above the tilt point (P). Driving torque is sup... | 01/28/1986 |
| 4564336 | Low drag, bearingless rotor head for helicopters A low drag, bearingless coupling is provided between a blade and hub of a helicopter rotor system by coupling the hub and blade together by means of a planar, elastic flexure or element which extends between the blade and the hub in a generally azimuthal ... | 01/14/1986 |
| 4545733 | Apparatus for adjusting the tracking of the blades in a rotor, especially for a rotary wing aircraft The blade angle of the blades is adjustable in a rotor for a rotary wing craft by a lever mechanism (13, 14 or 41, 42) secured to the radially inner end of an extension bushing (7; 7.1) or shaft (43). The extension bushing (7; 7.1) or shaft (43) is conne... | 10/08/1985 |
| 4541777 | Low drag, bearingless rotor head for helicopters A low drag, bearingless coupling is provided between a blade and hub of a helicopter rotor system by coupling the hub and blade together by means of a planar, elastic flexure or element which extends between the blade and the hub in a generally azimuthal ... | 09/17/1985 |
| 4512717 | Helicopter rotor FH (FLEX-HUB) helicopter rotor on which each blade is connected to a center hub by a fork having two arms on one side for connection to the relative blade and integral, on the other, to a rod connected to the hub by an elastomer support; the forks being i... | 04/23/1985 |
| 4502840 | Blade pitch control in rotatable bladed devices for vehicles A rotatable bladed device for vehicles, such as especially a helicopter rotor, which has its blade pitch controlled by a setup which includes a swash plate setup controlled by a set of hydraulic actuators and the particular swash plate setup position and ... | 03/05/1985 |
| 4496284 | Helicopter rotors Diametrically opposed rotor blades of a helicopter rotor are interconnected by a strap member which is flexible in torsion and in a plane perpendicular to a plane of rotation and has a plan profile extending between leading and trailing edges. Each rotor ... | 01/29/1985 |
