Patent US2129659A successfully refreshed from Google Patents.
Patent US4424945A successfully refreshed from Google Patents.
US4424945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Parafoil
Assignee: Individual
•
Filing: 1982-05-12
•
Granted: 1984-01-10
•
Expires: 2002-05-12
Abstract
Abstract A parafoil for supporting a flying machine, which parafoil has a forwardly extending central section open at the front to scoop in air during flight, and wings attached to the rear of the central section and which receive air into the interior thereof either directly or from the central section, said wings being divided into compartments of equalized pressure, and restraining elements attached to the parafoil central section in front of the parafoil wings and to the outer ends of the parafoil wings, thereby in flight to hold down the front of the parafoil central section and hold down the parafoil wings in an inverted U-shape.
Inventors
- 👤 Simon C. Dell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:22
CPC Classifications
B; B64; B64C; B64C31/00; B64C31/028; B64C31/036; F; F02; F02B; F02B1/00; F02B1/02; F02B1/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
163 words
A parafoil comprising a forwardly extending central section open at its front end to collect air during flight, inflatable wings connected to extend laterally from the central section and having communication means for access of air to the interior thereof from the central section, a rigid structure beneath the parafoil, at least one restraining element attached from the rigid structure to the parafoil central section in front of the wings for holding down the front end of said central section and maintaining the fore/aft position thereof relative to the wing tips during flight and at least one restraining element attached from the rigid structure to the outer terminal of each parafoil wing, the wings being unrestrained between the central section and their terminals so that lift on the wings therebetween is balanced by the tensile forces acting along the length of the wings primarily towards the tips thereof, the complete parafoil thus assuming an inverted U-shape in flight with the central section uppermost.
Claim 2
Dependent Claim
163 words
A parafoil comprising a forwardly extending central section open at its front end to collect air during flight, inflatable wings connected to extend laterally from the central section and having communication means for access of air to the interior thereof from the central section, a rigid structure beneath the parafoil, at least one restraining element attached from the rigid structure to the parafoil central section in front of the wings for holding down the front end of said central section and maintaining the fore/aft position thereof relative to the wing tips during flight and at least one restraining element attached from the rigid structure to the outer terminal of each parafoil wing, the wings being unrestrained between the central section and their terminals so that lift on the wings therebetween is balanced by the tensile forces acting along the length of the wings primarily towards the tips thereof, the complete parafoil thus assuming an inverted U-shape in flight with the central section uppermost.
Claim 3
Dependent Claim
49 words
A parafoil according to claim 1, wherein said rigid structure includes a central portion and rigid wing portions extending laterally from said central portion, the first said restraining means attaching to said central portion and the second said restraining means attaching to the outer ends of the wing portions.
Claim 4
Dependent Claim
39 words
A parafoil according to claim 2, wherein the parafoil central section has at least one front to rear stiffener and the parafoil wings each have a stiffener at the outer ends thereof, the restraining means connecting to said stiffeners.
Claim 5
Dependent Claim
21 words
A parafoil according to claim 1, wherein said rigid structure includes a seat for a pilot, landing means, and an engine.
Claim 6
Dependent Claim
27 words
A parafoil according to claim 1, wherein the parafoil wings include front to rear partitions adapted to define a plurality of parafoil wing compartments of equalised pressure.
Claim 7
Dependent Claim
27 words
A parafoil according to claim 1, including a flexible flap around the rear edge of the parafoil and control means for adjusting said flap to adjust lift.
Claim 8
Dependent Claim
23 words
A parafoil according to claim 1, including means for twisting the outer ends of the parafoil wings to effect roll control by wing-warping.
Claim 9
Dependent Claim
32 words
A parafoil according to claim 8, wherein the twisting means includes a pivotal connection between a rigid structure beneath the parafoil and a stiffener at the outer end of each parafoil wing.
Claim 10
Dependent Claim
16 words
A parafoil according to claim 8, including a rudder for correcting differential drag introduced by wing-warping.
References Cited (Backward Citations)
US1292662A
Cited
US2061640A
Cited
GB1181279A
Cited
US3524613A
Cited
US3945592A
Cited
US4191349A
Cited
US4261534A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-09 | 1987-07-11 | 1988-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-09 | 1991-07-11 | 1992-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-09 | 1995-07-11 | 1996-01-10 | $7700.00 | Window Closed / Lapsed |