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| Number | Title | Issue Date |
| 8152466 | Centrifugal force actuated variable span helicopter rotor A variable diameter helicopter rotor and method of using are disclosed. The variable diameter helicopter rotor includes a rotor hub operable by helicopter controls at variable revolutions per minute, and a linearly extensible rotor blade connected to the rotor hub, ... | 04/10/2012 |
| 7914258 | Fluid mechanical converter The present teachings relate to a fluid mechanical converter having at least one energy-accumulator mass system that can be powered by a power drive. To provide a fluid mechanical converter, which improves overall efficiency using the simplest components, it is prop... | 03/29/2011 |
| 7354246 | Electronics cooling fan with collapsible fan blade An electronics cooling fan comprises at least one collapsible fan blade driven by centrifugal force to extend radially as the fan spins and driven by elastic force to retract as spinning slows or stops. ... | 04/08/2008 |
| 7317260 | Wind flow estimation and tracking using tower dynamics A turbine control system for a variable speed electrical generator in a wind turbine mounted atop a support tower. The wind turbine converts wind energy into a driving torque applied to the generator. The control system includes a turbine support tower position sens... | 01/08/2008 |
| 7246998 | Mission replaceable rotor blade tip section A rotor blade includes a removable blade tip section which is mounted to an outboard rotor blade section by mechanically mounting a tip spar to a main blade spar with a spar interface section which bridges a butt joint between the blade spar and the tip spar. The sp... | 07/24/2007 |
| 7090550 | Propeller with variable geometry and method for varying geometry of a propeller The present invention broadly comprises a propeller having a blade assembly with a plurality of linking members operatively connected to change dimensions of the blade assembly as the linking members are moved with respect to one another. It further includes a blade... | 08/15/2006 |
| 7083377 | System and method and for use in hydroelectric power station and hydroelectric power station employing same It is generally known in relation to hydroelectric power stations that, before the water impinges on the turbine of the hydroelectric power station and there delivers its energy to the turbine, the water flows through a pipe. Depending on the respective nature of th... | 08/01/2006 |
| 7071578 | Wind turbine provided with a controller for adjusting active annular plane area and the operating method thereof A wind turbine which varies an active annular plane area by composing such that blades are attached to a cylindrical rotor movable in the radial direction of the rotor, the blades being reciprocated in the radial direction by means of a blade shifting mechanism conn... | 07/04/2006 |
| 7004427 | Retractable lifting blades for aircraft A rotor blade assembly for providing vertical lift to an aircraft, having a rotor head and a plurality of blades, with each blade attached to a mechanism such as a cam surface, whereby movement of the mechanism causes the radial distance between the distal tip of th... | 02/28/2006 |
| 6984110 | Windmill blade and apparatus for generating power using the blade Disclosed is a wind power generating apparatus in which windmill blades are mounted in a multi-stage fashion to a rotating shaft while being spaced apart from one another to efficiently generate wind power. Each windmill blade includes blade bodies mounted to the ro... | 01/10/2006 |
| 6972498 | Variable diameter wind turbine rotor blades A system and method for changing wind turbine rotor diameters to meet changing wind speeds and control system loads is disclosed. The rotor blades on the wind turbine are able to adjust length by extensions nested within or containing the base blade. The blades can ... | 12/06/2005 |
| 6923622 | Mechanism for extendable rotor blades for power generating wind and ocean current turbines and means for counter-balancing the extendable rotor blade A power generating system wherein a turbine is mounted on top of a tower or tethered underwater. The turbine includes a rotor having a main blade section connected to a rotor hub and an extender section. An adjusting device positions the extender section between a r... | 08/02/2005 |
| 6752595 | Propeller type windmill for power generation A plurality of wind turbine blades (3) are distributed equiangularly within a plane perpendicular to a horizontal rotating shaft (2) and around a hub (1) provided on the horizontal rotating shaft (2); the blade body of each turbine blade ... | 06/22/2004 |
| 6726439 | Retractable rotor blades for power generating wind and ocean current turbines and means for operating below set rotor torque limits A wind or water flow energy converter comprising a wind or water flow actuated rotor assembly. The rotor comprises a plurality of blades, wherein the blades of are variable in length to provide a variable diameter rotor. The rotor diameter is controlled to fully ext... | 04/27/2004 |
| 6655915 | Drive system for the retraction/extension of variable diameter rotor systems A drive system for a variable diameter rotor (VDR) system includes a plurality of rotor blade assemblies with inner and outer rotor blade segments. The outer blade segment being telescopically mounted to the inner blade segment. The VDR retraction/extensi... | 12/02/2003 |
| 6589017 | Aircraft airfoil assembly and method An aircraft rotatable airfoil assembly in the nature of a helicopter machine and having two airfoils diametrically disposed about an axis of rotation. Air baffles are mounted on the radially inner and radially outer ends of the airfoils and for blocking t... | 07/08/2003 |
| 6568906 | Conformal sliding bearing A conformal bearing assembly includes an bearing housing, an elastomeric member and a bearing element. The bearing assembly is mounted between and inner and outer telescopic member. The elastomeric member allows the bearing element to substantially confor... | 05/27/2003 |
| 6547519 | Blower impeller apparatus with pivotable blades Blower designs for vented enclosures include an impeller having a plurality of blades. The impeller includes a plurality of blades pivotably coupled to an impeller body. The blades pivot to enable operation in one of a closed and an open state. Air flow b... | 04/15/2003 |
| 6030177 | Drive system for a variable diameter tilt rotor A drive system for a variable diameter rotor system that includes a plurality of rotor blade assemblies with inner and outer blade segments. The outer blade segment being telescopically mounted to the inner blade segment. The drive system engaging a jacks... | 02/29/2000 |
| 6019578 | Variable diameter rotor blade actuation system A rotor blade actuation system is disclosed for controlling extension and retraction of an outboard blade section of a rotor blade by varying the speed and direction of rotation between a main rotor shaft and a blade actuation shaft. The rotor blade actua... | 02/01/2000 |
| 5848538 | Oil and refrigerant pump for centrifugal chiller A single motor drives both oil and refrigerant pumps in a refrigeration chiller, the motor and oil pump being disposed in the chiller's oil supply tank and the refrigerant pump being disposed exterior thereof. The refrigerant pump pumps liquid refrigerant... | 12/15/1998 |
| 5642982 | Retraction/extension mechanism for variable diameter rotors A retraction/extension mechanism (70) for a Variable Diameter Rotor system (10), the Variable Diameter Rotor system (10) having a plurality of rotor blade assemblies (16) mounted to and rotating with a rotor hub assembly (18) about an axis of rotation (20... | 07/01/1997 |
| 5310314 | Directional control system for rotary wing aircraft A tip brake unit for installation in tip portions of rotor blades of rotary wing aircraft having a plurality of load-carrying rotors has a frame of a size and shape for installation in a tip portion of a rotor blade. An elongate tip brake member of channe... | 05/10/1994 |
| 5096378 | Control of a wind turbine A wind turbine generator blade includes a movable front portion, extending from the faster-moving blade tip in a span-wise direction along the blade, and mounted on a pivot axis permitting the front portion to be displaced to a "high drag" position in whi... | 03/17/1992 |
| 4789297 | Enclosed wind device mechanism with eccentric rotor shaft A wind drive mechanism (10), comprising a housing (16) with a wind entry opening (25) and a wind outlet opening (26). In the housing (16) a rotor (30) is arranged with a vertically extending rotor shaft (31). The rotor shaft (31) is offset from the middle... | 12/06/1988 |
| 4335996 | Windmill construction Opposing windmill airfoil blades extend from a central hub and are connected thereto by a pair of cables secured to the inner ends of the blades and which each freely engages through the opposite ends of a cross member secured to the hub. These cables the... | 06/22/1982 |
| 4293274 | Vertical axis wind turbine for generating usable energy A wind turbine for converting wind forces into usable energy has a main shaft rotatably mounted in the axis of rotation for the wind turbine, and a pair of coacting complementary longitudinally extending vane members are connected to each other by a plura... | 10/06/1981 |
| 4162053 | Brake device for rotating body A brake device for retarding linear and rotative movement of a load carrying unit after ejection from an in-flight projectile, wherein a container encloses the unit and includes a plurality of slits which divide the container into sections. Each section i... | 07/24/1979 |
| 4142697 | Mechanism for synchronously varying diameter of a plurality of rotors and for limiting the diameters thereof A plurality of variable diameter rotors with mechanism for varying the diameter of the rotors synchronously, and including mechanism to limit the diameter of the rotors.... | 03/06/1979 |
| 4137010 | Constant lift rotor for a heavier than air craft A rotor blade extended radially from a hub, characterized by an elongated spar and a plurality of axially aligned shells pivotally mounted on the spar, each having an aerodynamic center located in trailing relation with the spar and supported thereby for ... | 01/30/1979 |
| 4073516 | Wind driven power plant A tethered wind-driven floating power plant which includes a support body carrying at least one rotor assembly, a current generator coupled to the rotor and alignment assembly for aligning the rotor to face into the wind, a ground anchor and at least one ... | 02/14/1978 |
| 4029435 | Retractable blade for a helicopter rotor A helicopter rotor having retractable blades each having a three dimensional truss including flexible cables which connect a blade member with a pitch member directly secured to a rotor hub, the cables providing for retraction of the blade member to a sto... | 06/14/1977 |
| 3990808 | Inflatable blower A centrifugal blower is disclosed wherein the impeller blades are made of a pliable, flexible, uniformly apertured sheeting made, for example, of plastic, affixed by a flexible support system, to a central rotatable shaft, so that as the rotatable shaft i... | 11/09/1976 |
