US4566853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Windmill
Assignee: Individual
•
Filing: 1983-06-23
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Granted: 1986-01-28
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Expires: 2003-06-23
Abstract
Abstract A vertical axis windmill with a plurality of horizontal arms (16) mounted on an upright central axis (12) so as to rotate in a substantially horizontal plane. Each arm (16) has hinged at its free end a blade 18 which is downwardly depending. Each blade 18 being mounted at an angle of pitch to the respective end of the arm (16) of from 20° to 80° and also mounted at an angle of tilt to the end of the arm (16) of from 5° to 30°. Preferably, each blade (18) comprises one or more paddles (14) hinged to one or more frames (15).
Inventors
- 👤 Chalerm Likitanupak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:06
CPC Classifications
F; F03; F03D; F03D3/00; F03D3/06; F03D3/062; F03D3/066; F03D3/067; F05; F05B; F05B2240/00; F05B2240/20; F05B2240/21; F05B2240/211; F05B2240/218; F05B2240/221; F05B2260/00; F05B2260/70; F05B2260/72; F05B2260/74; Y; Y02; Y02E; Y02E10/00; Y02E10/70; Y02E10/74
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
159 words
A vertical axis windmill comprising: an upright central axis; a plurality of horizontal arms mounted for rotation in a substantially horizontal plane about said upright central axis; a plurality of frames, each frame being substantially vertical and coupled to a free end of one of said arms, each of said frames having an uppermost section extending downwardly from one of said arms at a tilt angle of from 20° to 80° from said arm and extending forwardly from said arm in the direction of rotation of said arm at a pitch angle in the same plane as said arm of from 5° to 30° from said arm; and a plurality of blades, each blade being hinged at an edge thereof to said uppermost section of one of said frames, each blade being shaped so that upon rotation about said hinged edge said blade will contact said frame in said substantially vertical position thereby preventing further rotation of said blade.
Claim 2
Dependent Claim
159 words
A vertical axis windmill comprising: an upright central axis; a plurality of horizontal arms mounted for rotation in a substantially horizontal plane about said upright central axis; a plurality of frames, each frame being substantially vertical and coupled to a free end of one of said arms, each of said frames having an uppermost section extending downwardly from one of said arms at a tilt angle of from 20° to 80° from said arm and extending forwardly from said arm in the direction of rotation of said arm at a pitch angle in the same plane as said arm of from 5° to 30° from said arm; and a plurality of blades, each blade being hinged at an edge thereof to said uppermost section of one of said frames, each blade being shaped so that upon rotation about said hinged edge said blade will contact said frame in said substantially vertical position thereby preventing further rotation of said blade.
Claim 3
Dependent Claim
16 words
A vertical axis windmill according to claim 1, in which said angle of tilt is 10°.
Claim 4
Dependent Claim
25 words
A vertical axis windmill according to claim 1, in which each said blade consists of at least one paddle hinged to at least one frame.
Claim 5
Dependent Claim
20 words
A vertical axis windmill according to claim 3, in which a plurality of paddles are hinged to a single frame.
Claim 6
Dependent Claim
24 words
A vertical axis windmill according to claim 3, in which said paddle is made of one of aluminum sheet, synthetic plastic material or fibreglass.
Claim 7
Dependent Claim
20 words
A vertical axis windmill according to claim 1, wherein said frame is shaped complementary to the perimeter of said blade.
Claim 8
Dependent Claim
16 words
A vertical axis windmill according to claim 6 wherein said frame and said blade are rectangular.
Claim 9
Dependent Claim
219 words
A vertical axis windmill comprising: an upright central axis; a plurality of horizontal arms mounted to said central axis for rotation in a substantially horizontal plane about said upright central axis; a plurality of rectangular frames, each frame being coupled to a free end of one of said arms and being disposed in a substantially vertical plane, each of said frames having an uppermost section extending downwardly from one of said arms at a tilt angle of from 20° to 80° from said arm and extending forwardly from said arm in the direction of rotation of said arm at a pitch angle of from 5° to 30° from said arm, each said frame defining a rectangular opening; and a plurality of rectangular blades, each blade being hinged at an edge thereof to said uppermost section of one of said frames on a side thereof opposite said direction of rotation, each blade being further shaped to overlie said rectangular opening of the associated frame when the blade is in a substantially vertical position; whereby wind acting on the windmill causes each blade to move into said substantially vertical position during a first power phase of rotation of the windmill and towards a substantially horizontal position during a second phase of rotation allowing the wind to pass through said frame opening.
Claim 10
Dependent Claim
219 words
A vertical axis windmill comprising: an upright central axis; a plurality of horizontal arms mounted to said central axis for rotation in a substantially horizontal plane about said upright central axis; a plurality of rectangular frames, each frame being coupled to a free end of one of said arms and being disposed in a substantially vertical plane, each of said frames having an uppermost section extending downwardly from one of said arms at a tilt angle of from 20° to 80° from said arm and extending forwardly from said arm in the direction of rotation of said arm at a pitch angle of from 5° to 30° from said arm, each said frame defining a rectangular opening; and a plurality of rectangular blades, each blade being hinged at an edge thereof to said uppermost section of one of said frames on a side thereof opposite said direction of rotation, each blade being further shaped to overlie said rectangular opening of the associated frame when the blade is in a substantially vertical position; whereby wind acting on the windmill causes each blade to move into said substantially vertical position during a first power phase of rotation of the windmill and towards a substantially horizontal position during a second phase of rotation allowing the wind to pass through said frame opening.
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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) | 1989-01-27 | 1989-07-29 | 1990-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-27 | 1993-07-29 | 1994-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-27 | 1997-07-29 | 1998-01-28 | $7700.00 | Window Closed / Lapsed |