US4362470A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wind turbine
Assignee: Individual
•
Filing: 1981-04-23
•
Granted: 1982-12-07
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Expires: 2001-04-23
Abstract
Abstract A wind turbine has a shaft rotatable about an axis, and a plurality of blades mounted on the shaft and arranged to be rotated by wind and thereby rotate the shaft, wherein each of the blades has an outer portion which has an outer edge formed at the outer end of a radius with a center at the axis of the shaft and extends rearwardly from the outer edge over a circumference described from the center, and each of the blades has an inner edge which is rearwardly offset relative to the outer edge in a direction which is normal to the radius.
Inventors
- 👤 Gerlando J. Locastro
- 👤 Peter P. Giemsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:10
CPC Classifications
F; F03; F03D; F03D3/00; F03D3/06; F03D3/061; F05; F05B; F05B2240/00; F05B2240/20; F05B2240/21; F05B2240/211; F05B2240/213; F05B2240/217; Y; Y02; Y02E; Y02E10/00; Y02E10/70; Y02E10/74; Y10; Y10S; Y10S416/00; Y10S416/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
178 words
A wind turbine, comprising a shaft rotatable about an axis; and a plurality of blades mounted on said shaft and arranged to be rotated by wind and to thereby rotate said shaft, each of said blades having an outer portion which has an outer edge formed at the outer end of a radius with a center at said axis and extends only rearwardly from said outer edge over a circumference described from said center, each of said blades having an inner edge which is rearwardly offset relative to said outer edge and also from said radius in a direction which is normal to said radius by a predetermined distance, said outer portion having a length which corresponds to said distance, each of said blades having a central portion including a radially outer section and a radially inner section formed so that said radially outer section is concave toward said radius and described from a center which is offset from said radius in the normal direction by said distance, whereas said radially inner section is convex toward said radius.
Claim 2
Dependent Claim
178 words
A wind turbine, comprising a shaft rotatable about an axis; and a plurality of blades mounted on said shaft and arranged to be rotated by wind and to thereby rotate said shaft, each of said blades having an outer portion which has an outer edge formed at the outer end of a radius with a center at said axis and extends only rearwardly from said outer edge over a circumference described from said center, each of said blades having an inner edge which is rearwardly offset relative to said outer edge and also from said radius in a direction which is normal to said radius by a predetermined distance, said outer portion having a length which corresponds to said distance, each of said blades having a central portion including a radially outer section and a radially inner section formed so that said radially outer section is concave toward said radius and described from a center which is offset from said radius in the normal direction by said distance, whereas said radially inner section is convex toward said radius.
Claim 3
Dependent Claim
59 words
A wind turbine as defined in claim 1, wherein said shaft has a predetermined diameter, said inner edge of each of said blades being offset in the normal direction by a distance which is greater than the diameter of said shaft so that a gap is formed between said shaft and said inner edge of each of said blades.
Claim 4
Dependent Claim
52 words
A wind turbine as defined in claim 1, wherein said inner edge of each of said blades is offset radially beyond a further radius which is normal to said first-mentioned radius, as considered in a direction radially from said outer edge toward said inner edge of a respective one of said blades.
Claim 5
Dependent Claim
91 words
A wind turbine as defined in claim 1, wherein said inner edge of each of said blades is offset radially beyond a further radius which is normal to said first-mentioned radius, as considered in a direction radially from said outer edge toward said inner edge of a respective one of said blades, said central portion of each of said blades including a further section which extends between said inner section and said inner edge and has a length which does not exceed one fourth of said length of said outer portion.
Claim 6
Dependent Claim
60 words
A wind turbine as defined in claim 13, wherein said axis is an upright axis, said plurality of blades including a first group of upper blades located above and a second group of lower blades located below, the blades of one of said groups being offset relative to the blades of the other of said groups in a circumferential direction.
Claim 7
Dependent Claim
58 words
A wind turbine as defined in claim 5, wherein said blades are uniformly distributed in the circumferential direction so that the blades of each group are offset relative to each other by 120°, and each of the blades of one of said groups is offset relative to a neighboring blade of the other of said groups by 60°.
Claim 8
Dependent Claim
128 words
A wind turbine as defined in claim 1, wherein said axis is an upright axis, and said plurality of blades includes a first group of upper blades located above and a second group of lower blades located below; and further comprising means for connecting said blades with said shaft and including three disks extending normal to said shaft and fixedly connected with the latter, said three disks including an upper disk located above the blades of said first group of blades and fixedly connected with the same, an intermediate disk located between the blades of said first and second groups of blades and fixedly connected with the same, and a lower disk located below the blades of said second group of blades and fixedly connected with the latter.
Claim 9
Dependent Claim
21 words
A wind turbine as defined in claim 7, wherein each of said disks has a radius corresponding to said first-mentioned radius.
Claim 10
Dependent Claim
27 words
A wind turbine as defined in claim 7; and further comprising a frame and means for rotatably mounting said shaft in said frame and including bearing elements.
References Cited (Backward Citations)
FR601266A
Cited
FR727519A
Cited
FR797106A
Cited
US2252788A
Cited
FR59016E
Cited
US4005947A
Cited
CH596447A5
Cited
GB1518151A
Cited
US4177009A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-12-06 | 1986-06-07 | 1986-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-06 | 1990-06-07 | 1990-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-06 | 1994-06-07 | 1994-12-07 | $7700.00 | Window Closed / Lapsed |