US4465537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a wooden wind turbine blade
Assignee: North Wind Power Co Inc
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Filing: 1982-05-19
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Granted: 1984-08-14
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Expires: 2002-05-19
Abstract
Abstract A wooden wind turbine blade is formed by laminating wood veneer in a compression mold having the exact curvature needed for one side of the blade, following which the other side of the blade is ground flat along its length but twisted with respect to the blade axis.
Inventors
- 👤 Clint Coleman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:38
CPC Classifications
F; F03; F03D; F03D1/00; F03D1/06; F03D1/065; F05; F05B; F05B2240/00; F05B2240/20; F05B2240/30; Y; Y02; Y02E; Y02E10/00; Y02E10/70; Y02E10/72; Y02P; Y02P70/00; Y02P70/50; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1043; Y10T156/1044
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
144 words
A process for manufacturing a rotor blade comprising the steps of forming a concave mold matching a predetermined air foil surface contour, wetting a plurality of thin wood layers with adhesive, stacking a predetermined number of wetted layers of wood on the concave mold, applying uniform pressure to the top layer while bonding the wooden layers together into an elongated laminated blank having convex and concave sides, bringing a rotating abrasive drum having a drum axis into contact with the concave surface of the blade blank with the drum axis approximately perpendicular to the length of the blank, and forcing the abrasive drum against the blank while both advancing the drum axially along the length of the blank and also gradually varying the tilt angle of the drum axis relative to horizontal according to a predetermined twist schedule to form a flat-bottomed air foil.
Claim 2
Dependent Claim
144 words
A process for manufacturing a rotor blade comprising the steps of forming a concave mold matching a predetermined air foil surface contour, wetting a plurality of thin wood layers with adhesive, stacking a predetermined number of wetted layers of wood on the concave mold, applying uniform pressure to the top layer while bonding the wooden layers together into an elongated laminated blank having convex and concave sides, bringing a rotating abrasive drum having a drum axis into contact with the concave surface of the blade blank with the drum axis approximately perpendicular to the length of the blank, and forcing the abrasive drum against the blank while both advancing the drum axially along the length of the blank and also gradually varying the tilt angle of the drum axis relative to horizontal according to a predetermined twist schedule to form a flat-bottomed air foil.
Claim 3
Dependent Claim
30 words
The process of claim 1, wherein said step of applying uniform pressure to the top layer is accomplished by means of expanding an air bag press against the top layer.
Claim 4
Dependent Claim
11 words
The process of claim 1, wherein said adhesive is melamine urea.
Claim 5
Dependent Claim
15 words
The process of claim 1, wherein said adhesive is heated while pressure is being applied.
Claim 6
Dependent Claim
24 words
The process of claim 4, wherein said adhesive is melamine urea and said step of heating said adhesive is accomplished by radio frequency heating.
References Cited (Backward Citations)
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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) | 1987-08-14 | 1988-02-13 | 1988-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-14 | 1992-02-13 | 1992-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-14 | 1996-02-13 | 1996-08-14 | $7700.00 | Window Closed / Lapsed |