US4278401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blade for wind motors
Assignee: Fiat SpA
•
Filing: 1978-11-21
•
Granted: 1981-07-14
•
Expires: 1998-11-21
Abstract
Abstract A wind motor blade of composite construction has a blade shell of plastics material reinforced internally by transverse ribs and intersecting longitudinal struts in which metal fork arms are embedded, the fork arms being connected to a metal root attachment spigot through a metal cross-piece encapsulated in the plastics material.
Inventors
- 👤 Gabriele Martinelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:27
CPC Classifications
F; F03; F03D; F03D1/00; F03D1/06; F03D1/065; F03D1/0675; F05; F05B; F05B2240/00; F05B2240/20; F05B2240/30; Y; Y02; Y02E; Y02E10/00; Y02E10/70; Y02E10/72
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
113 words
Blade for a wind motor, comprising, in combination: a hollow blade shell of plastics material having a number of internal transverse reinforcing ribs and at least two internal longitudinal reinforcing ribs interconnecting said transverse reinforcing ribs; a metal reinforcement and attachment member embedded in said plastics material adjacent the radially inner end of the blade; said metal member having at least two metal arms completely embedded in said longitudinal reinforcing ribs respectively, a metal cross-piece interconnecting said arms completely embedded in said plastics material, and a metal root member attached to said metal cross-piece and projecting longitudinally beyond the radially inner end of the blade for anchoring the blade to a rotor hub.
Claim 2
Dependent Claim
113 words
Blade for a wind motor, comprising, in combination: a hollow blade shell of plastics material having a number of internal transverse reinforcing ribs and at least two internal longitudinal reinforcing ribs interconnecting said transverse reinforcing ribs; a metal reinforcement and attachment member embedded in said plastics material adjacent the radially inner end of the blade; said metal member having at least two metal arms completely embedded in said longitudinal reinforcing ribs respectively, a metal cross-piece interconnecting said arms completely embedded in said plastics material, and a metal root member attached to said metal cross-piece and projecting longitudinally beyond the radially inner end of the blade for anchoring the blade to a rotor hub.
Claim 3
Dependent Claim
19 words
The blade defined in claim 1, wherein said root member has a frusto-conical shape tapering towards its free end.
Claim 4
Dependent Claim
25 words
The blade defined in claim 1, including two end pins extending transversely of the longitudinal axis of the blade from opposite ends of the cross-piece.
Claim 5
Dependent Claim
28 words
Blade defined in claim 3, wherein the cross-piece comprises a cylindrical member and the end pins comprise cylindrical pins extending coaxially with the axis of said cylindrical member.
References Cited (Backward Citations)
US1372086A
Cited
DE702039C
Cited
US2454200A
Cited
US2715598A
Cited
US3028292A
Cited
US3554664A
Cited
US3647317A
Cited
US3645481A
Cited
US3720481A
Cited
US4081220A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-07-13 | 1985-01-12 | 1985-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-13 | 1989-01-12 | 1989-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-13 | 1993-01-12 | 1993-07-14 | $7700.00 | Window Closed / Lapsed |