Patent US3942909A successfully refreshed from Google Patents.
US3942909A
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US
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Vertical axis fluid driven rotor
Assignee: Science Applications Inc
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Filing: 1974-07-22
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Granted: 1976-03-09
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Expires: 1994-07-22
Abstract
Abstract A vertical axis wind-driven rotor which combines effective utilization of the energy in a strong wind with maintenance of effective torque at low wind speeds. In one embodiment, the rotor has a reservoir of liquid located near its base. A plurality of tubes radiate outwardly from the reservoir along the base, then rise upwardly along the outer edges of the rotor vanes. In another embodiment, a Savonius type rotor is modified so that the vanes are hinged, and the trailing edge of each vane weighted, whereby in a wind the rotor starts in a fully open condition and automatically feathers itself at high wind speeds.
Inventors
- 👤 William C. Yengst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:41
CPC Classifications
F; F03; F03D; F03D3/00; F03D3/06; F03D3/062; F03D7/00; F03D7/06; F05; F05B; F05B2240/00; F05B2240/20; F05B2240/202; F05B2240/21; F05B2240/211; F05B2240/213; Y; Y02; Y02E; Y02E10/00; Y02E10/70; Y02E10/74
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
82 words
A vertical axis rotor comprising curved vanes overlapping in their diameters and attached to a shaft, a pair of spaced-apart end plates adapted to hold and permit rotation of the shaft to which said vanes are attached, and means for weighting an edge of said vanes comprising a plurality of tubes, each tube being positioned along the outer edge of each vane and connected to a source of liquid so that as the shaft and vanes rotate, fluid rises in said tubes.
Claim 2
Dependent Claim
82 words
A vertical axis rotor comprising curved vanes overlapping in their diameters and attached to a shaft, a pair of spaced-apart end plates adapted to hold and permit rotation of the shaft to which said vanes are attached, and means for weighting an edge of said vanes comprising a plurality of tubes, each tube being positioned along the outer edge of each vane and connected to a source of liquid so that as the shaft and vanes rotate, fluid rises in said tubes.
Claim 3
Dependent Claim
20 words
The rotor of claim 1 wherein the said source of fluid is a reservoir near the base of the rotor.
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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) | 1979-03-09 | 1979-09-08 | 1980-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-09 | 1983-09-08 | 1984-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-09 | 1987-09-08 | 1988-03-09 | $7700.00 | Window Closed / Lapsed |