| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 416140000 | Including movement limit stop or damping means | 19 |
| 20080206054 | Aerofoil assembly - An aerofoil assembly comprising a plurality of rotatable blades. A damping member is disposed between at least two of the blades, each of the at least two blades having an aerofoil portion, a stem portion and a root portion. A recess is provided on two cooperating stem portions with a first shelf extending from a first end of each recess, and a second shelf extending from a second end of each recess to define a compartment. When the blades are aligned the damping member is held on one side of the shelves within the compartment. The damping member is provided with a projection at one corner and a projection on a diagonally opposite corner, the longitudinal distance between ends of the projections being greater than the distance between edges of the first and second shelf. | 08-28-2008 |
| 20080247876 | Soft In-Plane Tiltrotor Hub - A rotor hub assembly for a rotary-wing aircraft has a central member and a plurality of blade grips adapted for attaching rotor blades to the central member. The blade grips are pivotally attached to the central member and are capable of pivoting about a pivot axis generally normal to a plane of rotation of the blades. The pivoting allows for in-plane motion of the blades relative to the central member. A damper is operably connected to each blade grip for damping the in-plane motion of the associated blade, each damper being selectively switchable between at least two spring rates. | 10-09-2008 |
| 20080292460 | Fluid Turbine With Fluid-Tiltable Blades - A fluid-driven turbine includes a main driving shaft defining a shaft axis and a plurality of blade sets symmetrically disposed about the main driving shaft. Each of the plurality of blade sets includes a rod extending radially from the main driving shaft in a direction transverse to the shaft axis. The rod defines a rod axis. Each blade set also includes a fluid-tiltable blade connected to the rod and extending along the direction of the rod axis. It has an airfoil shape in cross-section with a leading edge, a trailing edge, and a maximum thickness. The blade is divided into first and second moment-inducing sections located on opposite sides of the rod with the first moment-inducing section being greater in area than the second moment-inducing section. Also, it is rotatable about the rod axis between an optimum pressure-receiving position and a least fluid-resistance position for receiving fluid energy from variable directions. The blade sets also include a stopper system limiting rotation of the blade about the rod axis to a rotation range between the optimum pressure-receiving position and a least fluid-resistance position. | 11-27-2008 |
| 20080304968 | VERTICAL-AXIS TURBINE FOR CAPTURING THE FORCE OF MOVING GASES OR LIQUIDS AND A METHOD FOR ITS USE - A vertical-axis turbine is provided, which comprises two or more arc-shaped blades which can pivot so as to decrease drag and maximize the force collected by each blade from moving gas or liquid. These arc-shaped blades can also be capable of directing moving gas or liquid from one blade to another. Additionally, these blades can comprise thin strips along their outer edge, which can increase their strength and rigidity as well as increase the amount of force captured by each blade from the moving gas or liquid. | 12-11-2008 |
| 20090110555 | HELICOPTER AIRCRAFT VEHICLE ROTOR DAMPER - A helicopter rotor damper system including a torsional damper with a damper centering bearing providing a damper center of rotation axis, a first elastomeric torsional damper with a first elastomeric torsional damper torsional elastomer bonded between a first elastomeric torsional damper first torsional damper nonelastomeric bonding surface and a first elastomeric torsional damper second torsional damper nonelastomeric bonding surface, and a second elastomeric torsional damper with a second elastomeric torsional damper torsional elastomer bonded between a second elastomeric torsional damper first torsional damper nonelastomeric bonding surface and a second elastomeric torsional damper second torsional damper nonelastomeric bonding surface. The helicopter rotor damper system includes a damper link linked with the torsional damper, with the torsional damper and the damper link connected between a helicopter blade and a helicopter rotor with the elastomeric torsional damper nonelastomeric bonding surfaces relatively rotating. | 04-30-2009 |
| 20090180882 | SYSTEM AND METHOD OF DAMPING A 1P MOTION - A rotor system includes a multiple of rotor blade yokes mounted to a rotor hub. A lead/lag damper is mounted to each of the rotor blade yokes and to a damper hub. An actuator system is operable to shift a damper hub axis of rotation relative the rotor axis of rotation to minimize 1P damper motions. A method of minimizing 1P damper motions within a rotor system includes shifting the damper hub axis of rotation relative the rotor axis of rotation to oscillate an inner connector of each lead/lag damper in phase with a 1P blade motion to minimize the 1P motion of the damper. | 07-16-2009 |
| 20090196749 | PRENTICE WIND ENGINE - The Prentice Wind Engine will operate 100% from “wind power” from any direction to produce both air pressure as well as hydraulic pressure at the same time to work together to generate electricity. In the case of the Prentice Wind Engine, assuming that the wind is coming from the north direction, panel # | 08-06-2009 |
| 20090297348 | ADJUSTING APPARATUS FOR ADJUSTING THE PITCH ANGLE OF PROPELLER BLADES, VARIABLE-PITCH PROPELLER, CONTROL FUNCTION WHICH CAN BE IMPLEMENTED IN A COMPUTER, AND METHOD FOR ADJUSTING THE PITCH ANGLE OF PROPELLER BLADES - An adjusting apparatus ( | 12-03-2009 |
| 20100080704 | METHOD AND SYSTEM FOR LIMITING BLADE PITCH - A method for limiting blade pitch is provided. The method includes providing a brake assembly that is actuatable to limit blade pitch, providing a limit stop assembly including a stop wheel and a traveler movable relative to the stop wheel, and coupling the limit stop assembly to the brake assembly such that the limit stop assembly actuates the brake assembly when the traveler engages the stop wheel. | 04-01-2010 |
| 20100098542 | Wind Turbine Having Two Sets of Air Panels to Capture Wind Moving in Perpendicular Direction - A wind turbine, having: (a) a rotatable frame; (b) a plurality of first air panels mounted to the rotatable frame, the plurality of first air panels extending in a direction parallel to an axis of rotation of the rotatable frame; (c) a plurality of second air panels mounted to the rotatable frame, the plurality of second air panels extending in directions radial to the axis of rotation of the rotatable frame; and (d) a base shaped to direct air flow received from a direction radial to the axis of rotation of the rotatable frame into a direction parallel to the axis of rotation of the rotatable frame. A system for positioning airfoils on a rotating frame wind turbine, having: a rotating frame; a plurality of airfoils pivotally connected to the rotating frame; a pair of positional stops for each airfoil on the rotating frame, wherein the pair of positional stops are located to limit rotation of the airfoil such that the airfoil is positioned in a high-drag position as the airfoil moves with the wind, and in a low drag position as the airfoil moves against the wind. | 04-22-2010 |
| 20100202883 | Advanced vertical shaft wind turbine power generator - A design for a scalable advanced design vertical shaft wind turbine power generator which incorporates a superior symmetrical blade configuration and a unique blade mounting approach which utilizes aerodynamic forces to provide wide changes in blade positions o optimize efficiency and eliminates the need for expensive mechanical control devices while minimizing manufacturing, operational and maintenance costs. | 08-12-2010 |
| 20110255973 | DAMPING ELEMENT AND METHOD FOR DAMPING ROTOR BLADE VIBRATIONS, A ROTOR BLADE, AND A ROTOR - A damping system for damping vibrations of a rotor blade of a rotor of a turbomachine is disclosed. A damping element is guided on a support such that the damping element is radially outwardly movable during a rotation of the rotor and is contactable with a lower platform area of a rotor blade. A circumferential contact surface is formed by an elevation on the lower platform area, where the circumferential contact surface is a limit stop for a movement of the damping element. | 10-20-2011 |
| 20120128491 | Automatic Blade Pitch Angle Control Mechanism for Small Horizontal Axis Wind Turbines - A wind turbine includes a hub comprising at least three spaced projections and a hub cap; at least three blades each comprising a root plate at one end, the root plate including a sleeve having a hole on a windward side; at least three shaft members each interconnecting the root plate and a corresponding projection; at least three sets of four abutment plates each secured to either side of the root plate or either side of the projection; U-shaped steel torsion bars each having both ends at an inclined angle of about 15 to 25 degrees fastened in the abutment plate and disposing the root plate at an angle of about 4 to 10 degrees with respect to the corresponding projection; a spring put on the rotation shaft on a leeward side of the hub; and pins each installed in a hub cap and sticking into the hole. | 05-24-2012 |
| 20120141276 | FREQUENCY-DEPENDENT DAMPER AND ROTARY WING SYSTEM - A frequency-dependent damper for creating a damping force in response to a variable-frequency disturbance includes an outer damper body having an internal cavity, an inner damper body for receiving the variable-frequency disturbance extending into the internal cavity, a first fluid chamber and a second fluid chamber defined inside the internal cavity, a piston separating the first and second fluid chambers, a selected orifice for transferring fluid between the first and second fluid chambers, and a selected spring element arranged serially between the piston and the inner damper body such that the piston can move relative to the inner damper body through deformation of the spring element. | 06-07-2012 |
| 20120148409 | ROTOR DAMPER AND TAIL ROTOR WITH SUCH A ROTOR DAMPER - A rotor damper for a tail rotor of a helicopter. A main body of a resilient material is to be arranged between a drive shaft for the tail rotor and a hub on which rotor blades for the tail rotor are coupled. A flange is connected to the main body of the rotor damper. The flange includes an abutment surface for abutting an outer surface of the hub. A tail rotor including the rotor damper. | 06-14-2012 |
| 20120251318 | WIND TURBINE WITH A BROAD-BAND DAMPING DEVICE IN EACH BLADE - Wind turbine comprising one or more blades, incorporating in each blade a damping device comprising a first damping element tuned at the main resonance frequency of the blade Ω o and K additional damping elements tuned at frequencies Ω | 10-04-2012 |
| 20130164134 | Limited Yaw Wind Turbine - Downwind wind turbine with limited yaw, held by guy wires ( | 06-27-2013 |
| 20140112786 | Reversible Blade Damper - A damper body extends between an axial first end, an opposing axial second end, a first lateral side, and an opposing second lateral side. A first pair of lugs are disposed at the first axial end and a second pair of lugs are disposed at the second axial end. In the first lug pair, a lug has an axially outermost foot which extends laterally beyond a lateral wall. The second lug pair has a lug with an axial outermost point with a foot extending laterally beyond a lateral wall. The foot on the first axial end and the foot on the second axial end are on opposed lateral sides. | 04-24-2014 |
| 20140119917 | TURBINE BLADE FOR A GAS TURBINE ENGINE - A turbine blade for a gas turbine engine may include a platform, an airfoil extending above the platform, and a root structure extending below the platform. The root structure may extend from a forward face to an aft face and include a shank region proximate the platform and a lower portion distal to the platform. The forward face of the shank region may project outward from the forward face of the lower portion. | 05-01-2014 |
