Did You Know...
...that one person who claimed to be the inventor of the television is Russian emigre Vladimir Zworykin? In 1929 David Sarnoff, founder of RCA, asked Zworykin what it would take to develop TV for commercial use. He said: a year and a half and $100,000. In reality, it took 20 years and $50 million! Before his death in 1982 at the age of 92, Zworykin said of his invention: "The technique is wonderful. It is beyond my expectations. But the programs! I would never let my children even come close to this thing."
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| Number | Title | Issue Date |
| 7331761 | Wind turbine pitch bearing and method A pitch bearing and related method for wind electric turbines has an annularly-shaped first bearing ring connected with an associated wind turbine blade, and includes a first raceway groove. An annularly-shaped second bearing ring is connected with the rotor portion... | 02/19/2008 |
| 7137590 | Lubricating installation for rocking power transmission box An installation includes at least a pressurized lubricating circuit for elements housed in the rocking crankcase, each circuit including a radial transfer bearing between two opposite cylindrical journals coaxial about the rocking axis, one fixed journal on a fixed ... | 11/21/2006 |
| 6940186 | Wind turbine having sensor elements mounted on rotor blades The invention relates to a wind power plant with a tower, a rotor having at least one rotor blade being substantially radially distant with respect to a rotor axis and being rotatably supported with respect to a substantially horizontal rotation axis in a portion at... | 09/06/2005 |
| 6398496 | Minimizing wind forces on helicopter blades Helicopter blades each have a piston connected to it. The pistons are movable within a cylinder between innermost and outermost positions. The hydraulic fluid of each cylinder is connected to other cylinders by a hydraulic tube or through a manifold. A dr... | 06/04/2002 |
| 6340290 | Controllable pitch propeller with a fail safe increased pitch movement A controllable pitch propeller is provided with a blade that naturally tends to rotate in a direction toward maximum pitch as a result of the hydrodynamic forces on the blade. As a result, the blade will move toward a pitch position of increased pitch mag... | 01/22/2002 |
| 6287077 | Adjustable-pitch boat propeller A boat propeller has a housing adapted to be fixed to a boat, a hub rotatable about a main axis on the housing, a plurality of generally radially projecting vanes pivotable on the hub, and an operating core shaft coaxially received in the hub, rotatable a... | 09/11/2001 |
| 6200096 | Actuation system for an active rotor control system A flap actuation system for a helicopter rotor blade. The rotor blade includes a root end, a tip end, a trailing edge and a flap hinged to at least a portion of the trailing edge about a pivot axis. The flap actuation system includes at least one supply l... | 03/13/2001 |
| 6196796 | High torque actuation system for an active rotor control system An actuation system for pivoting a flap on a helicopter rotor blade to reduce the interaction of the blade with the preceding blade vortex. The actuation system includes a fluid supply which is connected to first and second fluid supply lines. The fluid s... | 03/06/2001 |
| 6065935 | Cycloidal propeller having blades which may be set into a sailing position The invention provides for a cycloidal propeller, in strictly rudder operation, accessory apparatuses that mesh with a gear drive connected to a shaft of the respective wing. The invention accomplishes relatively small actuation movements of the accessory... | 05/23/2000 |
| 5993157 | Cycloidal propeller having wings operated by hydraulic clutches A cycloidal propeller to achieve strictly a rudder operation includes accessory apparatuses containing accessory drives. Clutches are used to couple the accessory drives to the propeller shafts, and additional clutches are provided to disengage the fixed ... | 11/30/1999 |
| 5281095 | Variable-pitch mechanism for a propeller A variable-pitch mechanism, for use in an airplane, a ship, or the like, for adjusting the pitch of a plurality of blades of a propeller in which attachment shafts of a plurality of radial blades of a propeller are rotatably mounted on a tubular hub which... | 01/25/1994 |
| 5082424 | Connection system for aircraft propeller blades The invention relates to a connection system for connecting a ring which carries aircraft propeller blades to a turbine which the ring surrounds. Brackets extend between the ring and the turbine and accommodate thermal expansion of the turbine without sig... | 01/21/1992 |
| 4957413 | Omnidirectional variable thrust propeller An omnidirectional variable thrust propeller for a vehicle includes a hub, plurality of blades, and a plurality of shafts. Each shaft is coaxially rotatably connected to a respective blade and extends through the hub at an acute angle to a hub longitudina... | 09/18/1990 |
| 4946354 | Hydraulic device for individual control of pitch of a rotor blade A hydraulic device for the individual control of the pitch of a helicopter rotor blade by a rotary hydraulic jack, the stator vanes of which are integral with a sleeve fitted on the hub. The jack rotor carries rotor vanes movable relative to the stator va... | 08/07/1990 |
| 4934901 | Pitch change actuation system A self-locking pitch change actuator is configured to fit within an annular hub (34). A ring gear (40) is driven circumferentially by a tangentially oriented ballscrew (42) and traveler (44). The ballscrew (42) is driven by a hydraulic motor (50) controll... | 06/19/1990 |
| 4899641 | Electro-hydraulic helicopter system having individual blade control A novel electro-hydraulic control system for use with a helicopter includes a plurality of electro-hydraulic modules which provide control signals to corresponding blade actuators. A controller receives helicopter parameter input signals as well as pilot ... | 02/13/1990 |
| 4810164 | Pitch change arrangement for a variable pitch fan A pitch arrangement for a variable pitch fan assembly of a turbofan gas turbine engine comprises a plurality of fan blades, each of which has a root portion rotatably mounted, in a thrust bearing on a fan rotor. A control ring is arranged coaxially with a... | 03/07/1989 |
| 4792281 | Wind turbine pitch control hub In a variable pitch wind turbine system, pitch angle is determined by a pneumatically pressurized hydraulic actuator connected between crank arms on the blade pitch axles. The hydraulic line extends coaxially through the rotor drive shaft via a rotary uni... | 12/20/1988 |
| 4738591 | Blade pitch varying mechanism An apparatus for varying the pitch of propulsor blades of a gas turbine engine by eccentrically driven gears. The gas turbine engine includes a rotating structure, an annular gas flowpath coaxial with the rotating structure, a plurality of rotor blades co... | 04/19/1988 |
| 4697986 | Helicopter blade cyclic pitch control system A control and actuating system for adjusting the cyclic pitch of the blades of a helicopter automatically and independently in response to the blade gyrating angular position and to the helicopter forward velocity. This action is also independent of the c... | 10/06/1987 |
| 4669958 | Swashplate control system A swashplate control system (10) has a first gimbal ring (26) pivotally mounted at (32) along a longitudinal axis. A second gimbal ring (24) is pivotally attached at (28) to the first gimbal ring (26) along a lateral axis. A longitudinal cyclic actuator (... | 06/02/1987 |
| 4648345 | Propeller system with electronically controlled cyclic and collective blade pitch A plurality of blades extend radially from a hub which is rotated by a motor about a drive axis. Each blade has a root which is rotatably connected to the hub so that it can be independently twisted to vary the pitch thereof relative to the drive axis. A ... | 03/10/1987 |
| 4643643 | Apparatus for adjusting and locking pitch of a variable pitch propeller on a ship Apparatus for adjusting and locking the pitch of a variable pitch propeller. Within a propeller shaft, a hydraulic piston is provided which drives a rod, a plate, and levers to rotate the propeller blades in, and with respect to, the hub of the propeller.... | 02/17/1987 |
| 4575309 | Wind turbines A wind turbine having the tips of the blades pivotable to a position in which they act as brakes to slow the turbine down. The pivoting is caused by relative axial movement of the tip and main blade portions which is caused by the action of a spring. The ... | 03/11/1986 |
| 4571157 | Propeller with an interior arrangement to variate the pitch A rotor having airfoil section shaped blades is set into a fluid stream. Over a connection or transmission means a propeller is connected to the rotor. The fluid stream whereinto the rotor is set gives airflow energy to the rotor and revolves the rotor. T... | 02/18/1986 |
| 4569630 | Axial piston machine having a control flow fluid line passing through a medial shaft portion In hydrostatic pumps, motors and transmissions; faces, which slide and seal along adjacent faces, commonly have recesses for hydrostatic lubrication or for control of flow through ports. The invention provides additional arrangements on such faces for the ... | 02/11/1986 |
| 4555219 | Hub-mounted actuators for blade pitch collective control Blade collective pitch control is provided for a rotor system by rotary actuators located between adjacent blades. Each actuator is connected to the leading edge of one adjacent blade and the trailing edge of the other adjacent blade.... | 11/26/1985 |
| 4540341 | Adjustable propeller for marine vessel drive The adjustable propeller has an adjusting mechanism for adjusting the pitch of the individual propeller blades. The adjusting mechanism comprises an actuator and a correction mechanism for each propeller blade for cyclically adjusting the pitch angle of a... | 09/10/1985 |
| 4534704 | Helicopter rotor control system with integrated hub A rotor control system for a helicopter in which the conventional swashplate is eliminated and the rotor hub is integrated to include an actuator for each rotor blade. Two arrangements are employed, each of which utilizes a hydraulic circuit. One arrangem... | 08/13/1985 |
| 4466775 | Helicopter rotors A helicopter rotor having a rotor hub and a plurality of rotor blades includes for each blade a blade fold mechanism comprising a reversible rotary power source and a rack and pinion mechanism adapted to operate one or more lock pins and to fold the blade... | 08/21/1984 |
| 4462753 | Blade feathering system for wind turbines A blade feathering system for wind turbines includes a feather actuator (299), control means (330 and 335) operatively connected thereto and an adjustment means (340) operatively connected to the control means for selectively varying the rate of operation... | 07/31/1984 |
| 4422828 | Method of and apparatus for increasing propulsive efficiency of aircraft propellers Hub flexures affording beamwise flapping (i.e. flapping perpendicular to the original tip-path plane), mount aircraft propellers through a hub assembly to a drive shaft of a fixed wing aircraft for increasing propulsive efficiency. The hub flexures permit... | 12/27/1983 |
| 4392832 | Steering and propulsion system for marine use A universal steering and propulsion unit for marine craft utilizes a power train which includes a differential gearing unit with control of the power delivered being accomplished through selective braking of one side of the differential. Steering may be a... | 07/12/1983 |
| 4379678 | Individual blade control Individual blade control of a helicopter rotor is accomplished by rotation of a mast (10) about a standpipe (12) where an individual blade (16) is coupled to the mast through a hub (18). Pilot input signals are transmitted by fly-by-optic transmission lin... | 04/12/1983 |
| 4348156 | Blade pitch actuation system Blade pitch actuation system wherein the blades are hydraulically maintained in phase with one another. The system comprises hydraulic actuators each adapted to drive a single blade in a pitch change mode of operation. Fluid flow to the actuators is contr... | 09/07/1982 |
| 4348155 | Wind turbine blade pitch control system A pitch control system for a multibladed variable pitch wind turbine. Each of the turbine blades is pivotally driven about the longitudinal axis thereof independently of the other blades by at least a pair of hydraulic actuators. The actuators are supplie... | 09/07/1982 |
| 4229141 | Devices for operating variable-pitch propellers A propeller includes a hub having mounted on the central end part thereof a rotating fitting which permits the passage therethrough of a fluid circulating within two conduits which pass longitudinally of the fitting. The fluid operates on opposite ends of... | 10/21/1980 |
| 4113408 | Wind generator system A wind operated generator is disclosed herein having a stationary frame or base rotatably supporting at least four sets of pivotal blades intended to be driven by impinging wind currents. Each set of blades operate in unison for opening and closing air pa... | 09/12/1978 |
| 4003676 | Windmill blade and processes related thereto A windmill blade that has a rigid leading edge, a rigid root portion and a movable blade tip. Control of the geometric twist of the windmill blade is accomplished through proper selection of the axis of rotation for the movable blade tip and by controllin... | 01/18/1977 |
