# US 9,039,367 B2 · Propeller windmill for small-sized power generator

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- Number: US 9,039,367 B2
- Document ID: US9039367B2
- Status: Granted
- Kind: B2
- Application number: 14/127,804
- Filed: 2011-06-30
- Published: 2014-04-24
- Granted: 2015-05-26
- Earliest claimed: 2011-06-30
- Assignees: Educational Foundation Bunri Gakuen
- Applicants: Akira Obata
- Inventors: Akira Obata
- Web page: https://patentgrep.com/patent/US9039367B2

## CPC

- F03D 1/06: Rotors
- F03D 7/0204: {for orientation in relation to wind direction}
- F03D 7/0268: {Parking or storm protection}
- F05B 2240/2213: and with the rotor downwind from the yaw pivot axis
- F05B 2250/61: corrugated
- F05B 2280/4002: Cellulosic materials, e.g. wood
- F05B 2280/4003: Synthetic polymers, e.g. plastics
- F16C 2360/31: Wind motors
- Y02E 10/72: Wind turbines with rotation axis in wind direction
- F03D: WIND MOTORS
- F05B: INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

Provided is a small-sized propeller windmill which can efficiently generate power even when a wing speed is low, has no possibility that the windmill is broken even when a strong wind blows, can stably ensure a weathercock direction of a base blade, and can suppress an environmental burden, in such a propeller windmill, the blade having a corrugated wing shape is supported in a cantilever manner by way of an elastic body, and the blade and the elastic body are made of paper or plastic. Further, to stably ensure the weathercock. direction of the base blade, a weathercock stabilizing mechanism is arranged behind the base blade.

## Claims

### Claim 1

A propeller windmill for a small-sized power generator, comprising:
a lateral support strut rotatably connected to a vertical support strut, a power generator mounted on the lateral support strut;
a base blade configured as a two-wing propeller with each wing formed of a thin-plate-like sheet, the base blade having a symmetrical shape with respect to a rotational axis and being mounted behind the power generator on a rotary input shaft of the power generator by way of a hub; and
a windcock stabilizing mechanism;
wherein the thin-plate-like sheet has a corrugated wing shape such that a cross-sectional shape of each of the wings of the base blade in a direction perpendicular to a direction extending toward a distal end from a proximal end of that wing of the base blade is corrugated, and the base blade is exchangeable with a base blade of a different pitch angle or a different length measured between the proximal end and the distal end of each of the wings of the base blade; and
wherein the weathercock stabilizing mechanism is arranged behind the base blade coaxially with the base blade, the weathercock stabilizing mechanism is constituted of a cylindrical body which is formed of a thin sheet material and has a front portion thereof closed, and a plurality of cross wind receiving wings which are continuously formed on a rear end of the cylindrical body, and the power generator, the base blade and the weathercock stabilizing mechanism are formed as an integral body in a, yawing rotatable manner.

### Claim 2 (depends on 1)

The propeller windmill for a small-sized power generator according to claim 1, wherein each wing of the two-winged propeller comprises a discrete blade body comprising the thin-plate-like sheet having a corrugated wing shape and the propeller windmill further comprises deformable elastic bodies, the blade bodies each being supported cantileveredly on the hub by a respective one of the deformable elastic bodies.

### Claim 3 (depends on 2)

The propeller windmill for a small-sized power generator according to claim 2, wherein the blade bodies and the elastic bodies each comprise paper or plastic.

### Claim 4 (depends on 1)

The propeller windmill for a small-sized power generator according to claim 1, wherein a plurality of the base blades are mounted on the rotary shaft of the power generator in symmetry with respect to a rotational axis and arranged in an overlapping manner while keeping a predetermined interval between the base blade.

### Claim 5 (depends on 2)

The propeller windmill for a small-sized power generator according to claim 2, wherein a plurality of the base blades are mounted on the rotary input shaft of the power generator is symmetry with respect to a rotational axis, are mounted on the rotary input shaft of the power generator in an overlapping manner while keeping a predetermined interval between the base blades, and the base blades are mounted such that an axis in a longitudinal direction of a blade body of each base blade is displaced by a uniform angle in the azimuth direction.

### Claim 6 (depends on 2)

The propeller windmill for a small-sized power generator according to claim 2, wherein a pitch angle of the blade body is adjustably settable.

### Claim 7 (depends on 1)

The propeller windmill for a small-sized power generator according to claim 1, wherein the plurality of cross wind receiving wings are formed into a reverse hooked cruciform cross section or a hooked cruciform cross section.

### Claim 8 (depends on 7)

The propeller windmill for a small-sized power generator according to claim 7, wherein the cylindrical body which as the front portion thereof closed is detachably connected to a rear end of the rotary input shaft of the generator.