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A method of swing on a swing is disclosed, in which a user positioned on a standard swing suspended by two chains from a substantially horizontal tree branch induces side to side motion by pulling alternately on one chain and then the other.
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| Number | Title | Issue Date |
| 7296969 | Propeller pitch change system A pitch change system includes a yoke assembly which receives a pitch trunnion that extends from each propeller blade assembly. Each pitch trunnion is received within a respective bearing assembly mounted in the yoke assembly. The bearing assemblies are mounted betw... | 11/20/2007 |
| 7261517 | Device for adjusting a rotor blade of a wind energy turbine The device for adjusting a rotor blade of a wind energy turbine is provided with a driving device (12) for driving an adjusting element (24) for selectably rotating the rotor blade (26) in both directions about its longitudinal axis (28),... | 08/28/2007 |
| 7204674 | Rotor blade for a wind power installation A rotor for a wind power installation having at least one rotor blade. The smaller the surface area on which the wind acts, that is to say in particular the rotor blade area, the correspondingly lower is the load level for which installation has to be designed and t... | 04/17/2007 |
| 7204673 | Method of controlling a wind power installation A method for controlling a wind power installation at very high wind speeds, in which there is predetermined a first wind speed at which the rotor blades of the wind power installation are put into a first predetermined setting. In addition, the method includes cont... | 04/17/2007 |
| 7185854 | In-flight refueling system and method for extending and retracting an in-flight refueling device An in-flight refueling system and method are provided to extend and retract an in-flight refueling device between a stowed position and an extended position relative to a tanker aircraft. The system and method of the present invention provide an induction device con... | 03/06/2007 |
| 7131812 | Sky turbine that is mounted on a city A sky turbine, having impeller blades with a plurality of panels that can telescope inward and outward. The pitch of the panels can be adjusted, and the pitch of each panel on a blade, passing from the innermost panel to the outermost panel, differs from the pitch o... | 11/07/2006 |
| 7118336 | Pressurized oil supply for propeller engine system A system and method for providing pressurised oil during non-feathered in-flight shutdown conditions in a variable-pitch aircraft propeller engine. A secondary pump provides pressurised oil substantially independent of an engine main oil circuit. ... | 10/10/2006 |
| 7101237 | Propellor blade adjustment system for propulsion through fluid environments under changing conditions The stern end of a seawater hull has a rotor hub with propeller blades thereon. The rotor hub is rotated for propulsion of the hull by means of a propeller shaft extending through a sealed compartment within the hull. Such sealed compartment and an electrically powe... | 09/05/2006 |
| 7063125 | Fan penetration feature for in-vehicle testing A fan penetration fixture consisting of a threaded shaft and a lock nut design. The fixture is designed to take the place of the fan clutch on a fan drive assembly in the vehicle being tested for a desired cooling system performance characteristic at each possible f... | 06/20/2006 |
| 7008184 | Control for cooling fan A control for changing direction of air flow through a cooling core in response to an external signal and a purge signal includes a logic circuit and a relay assembly. The logic circuit generates a fan control signal based on the external signal, which causes the fa... | 03/07/2006 |
| 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 |
| 6942458 | Variable pitch fan An improved variable pitch fan comprising a fan hub, with fan blades extending radially outward from the fan hub and mounted for rotation about respective radially extending axes corresponding to each fan blade. Each fan blade has a blade surface extending perpendic... | 09/13/2005 |
| 6672835 | Method and apparatus for self-contained variable pitch and/or constant speed propeller including provisions for feathering and reverse pitch operation A self-contained variable pitch and/or constant speed propeller including provisions for feathering and reverse pitch operation, wherein no direct contact is required between the fixed engine or airframe and the rotating propeller for effectuation of blad... | 01/06/2004 |
| 6637202 | Turbocharger control system and propeller control system by stepper motor An aircraft control system includes a propeller governor in which a stepper motor is used to apply a compression force on a speeder spring, and a turbocharger in which a stepper motor is used to actuate a needle valve associated with a diaphragm cell. An ... | 10/28/2003 |
| 6511292 | Backup governing system for a variable pitch propeller A backup governing system for a variable pitch propeller, carried by the propeller hub which is hydraulically interposed between a main control for the propeller and a propeller blade moving, double acting piston, the backup governing system comprising a ... | 01/28/2003 |
| 6439850 | Variable pitch fan A variable pitch fan in which the pitch of the fan blades is varied under control of a controller according to the speed of the fan. The controller is programmed to respond to increased fan speed by decreasing pitch of the fan blades. The variable pitch f... | 08/27/2002 |
| 6358007 | Universal constant speed variable pitch boat propeller system An adjustable pitch boat propeller system adapted for mounting on a drive shaft of a marine drive unit of a boat. The propeller includes an hub that has been adapted for mounting over the drive shaft of the boat, the hub having an external surface and int... | 03/19/2002 |
| 6340289 | Single lever power controller for manned and unmanned aircraft Method and apparatus for controlling an aircraft engine with a single, manually-operable lever includes structure and function for generating a pilot thrust command from the single lever. A processor is coupled to the single lever and (i) receives the gen... | 01/22/2002 |
| 6171055 | Single lever power controller for manned and unmanned aircraft Method and apparatus for controlling an aircraft engine with a single, manually-operable lever includes structure and function for generating a pilot thrust command from the single lever. A processor is coupled to the single lever and (i) receives the gen... | 01/09/2001 |
| 6113351 | Variable pitch fan A variable pitch fan in which the pitch of the fan blades is varied under control of a controller according to the speed of the fan. The controller is programmed to respond to increased fan speed by decreasing pitch of the fan blades. The variable pitch f... | 09/05/2000 |
| 6109871 | Integrated fan assembly with variable pitch blades A fan assembly (10) includes first and second housing sections (70, 72) which, when mated by a first set of fasteners, define a plurality of circumferentially spaced openings (162) that lead to an internal housing chamber (82). The fan assembly (10) also ... | 08/29/2000 |
| 6004098 | Propulsion unit for an aircraft and its control procedure An engine plant for aircraft comprising a multicylinder internal combustion engine (1) whose crankshaft drives an adjustable pitch propeller (5), mechanisms for adjusting the engine speed and a common power stick (4) that controls the operation of the eng... | 12/21/1999 |
| 5931637 | Propeller with variable rate of pitch change A propeller is controlled to change pitch at at least two different rates. In one embodiment, an electric motor is provided with a high or low voltage for driving a pitch change mechanism at a high or low change rate. Preferably the rate is selected autom... | 08/03/1999 |
| 5897293 | Counterweighted propeller control system A system for controlling functions of a propeller having a plurality of blades is disclosed. The system comprises an electronic control for controlling the functions of the propeller. A plurality of backup devices are provided for backing up the electroni... | 04/27/1999 |
| 5415523 | Control system for variable-pitch boat propeller A marine drive has a propeller rotatable about a drive axis and having a plurality of blades themselves pivotable about respective blade axes projecting generally radially from the drive axis and each movable between a low-pitch end position extending gen... | 05/16/1995 |
| 5364231 | Full authority propeller pitch control A control for a hydraulic propeller pitch actuator includes a low power pilot valve responsive to digital electronic input signals to control movement of a hydraulic servomotor driving a higher power servovalve. Negative feedback motion is delivered from ... | 11/15/1994 |
| 5263846 | Self-actuated rotor system The present invention discloses a main rotor collective pitch control assly for rotary wing aircraft. The assembly uses segmented rotor blades. The collective pitch of each movable segment may be independently varied, or may be adjusted in unison with on... | 11/23/1993 |
| 5249924 | RAM air turbine The present invention relates to a ram air turbine which is preferably used in conjunction with a refueling pod on an aircraft for purposes of operating a fuel pump and/or reeling mechanism for paying in and paying out a fuel line. The turbine generally c... | 10/05/1993 |
| 5174718 | Blade pitch change control system A pitch change actuation system is disclosed for adjusting the pitch of a variable pitch propeller blades (120) operatively connected for pitch change to a pitch change actuator piston (140). A pitch change control system (10) is operatively connected to ... | 12/29/1992 |
| 5061153 | Aircraft propeller assembly with blade pitch reset for ground idle An aircraft propeller has adjustable pitch blades which are reset from a low pitch in-flight idle position to a lower pitch ground idle position by a beta feedback and reset mechanism. The reset mechanism includes a set of cam elements supported for movem... | 10/29/1991 |
| 4986734 | Overspeed protection system for aircraft fan engine An overspeed protection system for an aircraft fan engine wherein blades are rotatable from a coarse pitch to a fine pitch to a thrust-reverse condition. A wobbler-type hydraulic motor is provided for rotating the blade. An overspeed governor is operative... | 01/22/1991 |
| 4909709 | Throttle/propeller mixer cam A cam mechanism enabling the pilot to automatically advance the propeller low pitch stop with the engine power lever on airplanes with multibladed propeller systems having a beta control mechanism for adjusting the blade angle. The cam provides an inexpen... | 03/20/1990 |
| 4904157 | Aircraft propeller assembly with blade pitch reset for ground idle An aircraft propeller has adjustable pitch blades which are reset from a low pitch in-flight idle position to a lower pitch ground idle position by a beta feedback and reset mechanism. The reset mechanism includes a set of cam elements supported for movem... | 02/27/1990 |
| 4893989 | Variable propeller system incorporating a forward transfer bearing Hydraulic fluid is input to a transfer tube of a variable pitch propeller system forward of a rotatable portion of a controller. A transfer bearing is provided about the drive shaft to transfer hydraulic fluid therethrough and between the drive shaft and ... | 01/16/1990 |
| 4863347 | Bladed rotor assemblies A bladed rotor assembly comprising: a bladed rotor; an actuator for effecting a change of blade pitch; a first valve member connected to, and movable with, the actuator and having first and second passageways; and a second valve member co-operable with the first va... | 09/05/1989 |
| 4822243 | Bladed rotor assemblies and control means therefor A bladed rotor assembly and a control means therefor, which comprises a bladed rotor, a fluid-pressure-operable actuator for effecting a change of blade pitch, a first valve member connect to, and movable with the actuator and a second valve member co-ope... | 04/18/1989 |
| 4781533 | Control system for propeller with controllable pitch An actuating system for a controllable pitch propeller comprises a hydraulic servomotor arranged in the propeller hub and being connected mechanically to the propeller blades. Pressure medium is delivered to the servomotor, under the control of a control ... | 11/01/1988 |
| 4756667 | Pitch control capacitance coupling A master controller 14 on the stationary side of a propeller system 10 sends pitch control signals via a communications link 34 which comprises a pair of capacitors 64, 66, each capacitor having a stationary plate and a rotating plate, one capacitor formi... | 07/12/1988 |
| 4750862 | Modular propeller blade pitch actuation system A modular, easily replaceable, pitch actuation system is removably secured within the hub of an aircraft. The modular system houses a driving system which provides a rotational output to set the pitch of propeller blades mounted to the hub, and a pitch ch... | 06/14/1988 |
| 4692093 | Ram air turbine Apparatus and methods for adjusting the pitch of a fluid reactive blade member carried upon a rotor in response to a speed difference between the rotor and a reference speed shaft.... | 09/08/1987 |
