Bizarre Patents
Mountable Printable Placard With Headband
A resilient headband in a shape for being mounted on the head of the user. The headband is equipped with a longitudinal slotted member for holding a placard.
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| Number | Title | Issue Date |
| 7179054 | Flow reversal system for axial fan An axial fan has a blade support wheel coupled to a drive shaft. A disk is positioned about the drive shaft adjacent the wheel. A torsion spring is coupled to the wheel and to the disk. When the torsion spring is in tension, the disk is poised for a relative rotatio... | 02/20/2007 |
| 7172392 | Passive speed and power regulation of a wind turbine A wind turbine with at least one blade having a pitch axis that is offset laterally so that the blade does not intersect with an axis of rotation of the wind turbine, and a center of mass and an aerodynamic center are offset from the pitch axis in the direction para... | 02/06/2007 |
| 7066709 | Wind driven power generating system The present invention discloses a wind driven power generator. The wind driven power generating system comprises: a) an aerodynamic unit rotatably mounted at the top of a tower having a certain height; b) a plurality of rudders for aligning the aerodynamic unit with... | 06/27/2006 |
| 6942461 | Rotor blade hub The present invention concerns a rotor blade hub for a wind power installation. Such a hub represents a mechanical connection between the (horizontal) rotor shaft (rotor spindle) and the rotor blades. This means that all forces which occur at the rotor blades, insof... | 09/13/2005 |
| 6554573 | Rotor A rotor is intended to rotate in a fluid flowing in a flow direction and comprises a plurality of rotor blades, at the most four blades, which are arranged to rotate about an axis of rotation. Each blade forms a single-curved surface, the generatrix of wh... | 04/29/2003 |
| 6126399 | Feathering propeller A featherable propeller assembly for fitment to a drive shaft has a blade carrying assembly which is carried by a hub assembly. The blade carrying assembly is rotatable relative to the hub assembly within relative limits of rotation. Blades are pivotally ... | 10/03/2000 |
| 5593280 | Propeller for boat In a propeller for a boat, a plurality of stationary blades and a plurality of variable blades are alternately disposed around an outer periphery of a propeller boss. Exhaust passages are formed in the propeller boss to axially pass through the propeller ... | 01/14/1997 |
| 5562417 | Control mechanism for RAM air turbine A control mechanism is provided which feathers the propeller blade pitch during stopping and stores restart energy in the blade pitch governor mechanism. Deceleration to the feathered mode is aided by the airstream. During restart, excess stored energy is... | 10/08/1996 |
| 5366343 | Self-adjusting torque-responsive variable-pitch boat propeller A self-adjusting variable-pitch propeller has a drive shaft rotatable about a shaft axis in a predetermined forward rotational sense, a hub carried on the drive shaft and limitedly rotatable relative thereto about the shaft axis both in the forward rotati... | 11/22/1994 |
| 5290147 | Variable pitch marine propeller with shift biasing and synchronizing mechanism A marine propeller includes a hub rotatable about a longitudinal axis and having a plurality of blades extending radially outwardly therefrom and pivotable about respective radial pivot axes between a low pitch position and a high pitch position. A disc h... | 03/01/1994 |
| 5257907 | Axially compact ram air turbine An undesirably long axial length of a ram air turbine may be reduced in a construction including a hub (110) mounted for rotation about a rotational axis (112), at least one turbine blade (114) rotatably mounted on the hub (110) for rotation between coars... | 11/02/1993 |
| 5213470 | Wind turbine A wind turbine assembly including a rotor body having mounted thereon a plurality of rotor blades. Each of the rotor blades may be joined at an inner extremity to a blade stem projection extending interiorly into the rotor body and secured to the rotor bo... | 05/25/1993 |
| 4743163 | Ram air turbine control system A blade pitch control mechanism for a ram air driven turbine blade mounted for rotation on a hub assembly having a central axis. A governor control member, including a seat, is mounted on a portion of the hub assembly for reciprocation along the central a... | 05/10/1988 |
| 4678923 | Windmill A windmill for generating electricity in which each blade of the air-screw is connected to the hub by means of at least two resilient strips which are oppositely inclined both in the plane of rotation of the blade and in a plane extending through the rota... | 07/07/1987 |
| 4411596 | Ram air turbine control system The present invention relates to an improved blade pitch control mechanism for an air driven turbine blade mounted for rotation in a hub assembly. The control mechanism includes a drive member mounted for reciprocation along a central axis of the hub asse... | 10/25/1983 |
| 4365937 | Adjustable pitch propeller drive A pair of axially movable abutments are spaced apart axially within a propeller hub. A plurality of adjustable propeller blades are rotatably mounted on the hub and each has an inner portion located inside the hub. Such inner portion is in the form of a p... | 12/28/1982 |
| 4352633 | Windmill blade stalling and speed control device The windmill stalling and speed control device is mounted in the blade supporting hub of a windmill and is operative in response to blade rotation induced by a blade pitch control unit. The device includes a biasing assembly mounted to oppose blade rotati... | 10/05/1982 |
| 4257740 | Speed governing hub for windmill An improved speed governor is disclosed for feathering a plurality of blades on a windmill. Each blade is attached through a rotatable shaft to a support plate which in turn drives an output shaft. Each blade shaft is connected through a control rod to a ... | 03/24/1981 |
| 4231317 | Boat propeller device The invention relates to a boat propeller having rotatably journalled blades in its hub to enable shifting between forward and reverse without reversing the direction of rotation. The hub is rotatably journalled on the propeller shaft and contains a trans... | 11/04/1980 |
| 4179241 | Full feathering, reversible pitch, constant RPM propeller A pitch change slide is mounted for longitudinal movement on a propeller shaft hub adapter in turn secured to the engine shaft of an aircraft engine, the said slide carrying a plurality of toothed racks each engaged with a spur gear on the base of one of ... | 12/18/1979 |
