Patent US5042747A successfully refreshed from Google Patents.
US5042747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vertical take-off aircraft
Assignee: Individual
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Filing: 1987-06-10
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Granted: 1991-08-27
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Expires: 2007-06-10
Abstract
Abstract An aircraft of any type supported by a rotor and having an auxiliary tail is provided with means that allows, at the moment of take-off, at least part of its tail to take an inclined position in relation to the position of flight. The invention is particularly applicable to autogyros.
Inventors
- 👤 Denis Rabouyt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:34
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/02; B64C5/00; B64C5/10; B64C5/16
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
125 words
An autogyro, comprising: (a) a rotor having a plane of rotation, (b) a propeller (c) a tail unit having at least one inner plane part located in the well of wind of the rotor and the propeller, said inner part having a transverse axis of pivoting which is substantially parallel to said plane of rotation and being mounted for freely pivoting about said axis, (d) locking means for locking said inner part in a normal flight position and unlocking means for releasing said inner part to allow it to pivot freely and take a downwardly inclined position with respect to the normal flight position at the time of take-off, (e) said locking and unlocking means comprising a linkage, comprising bell-crank levers having a friction device.
Claim 2
Dependent Claim
125 words
An autogyro, comprising: (a) a rotor having a plane of rotation, (b) a propeller (c) a tail unit having at least one inner plane part located in the well of wind of the rotor and the propeller, said inner part having a transverse axis of pivoting which is substantially parallel to said plane of rotation and being mounted for freely pivoting about said axis, (d) locking means for locking said inner part in a normal flight position and unlocking means for releasing said inner part to allow it to pivot freely and take a downwardly inclined position with respect to the normal flight position at the time of take-off, (e) said locking and unlocking means comprising a linkage, comprising bell-crank levers having a friction device.
Claim 3
Dependent Claim
174 words
An autogyro, comprising: (a) a rotor having a plane of rotation, (b) a propeller (c) a tail unit having at least one inner plane part located in the well of wind of the rotor and the propeller, said inner part having a transverse axis of pivoting which is substantially parallel to said plane of rotation and being mounted for freely pivoting about said axis, (d) locking means for locking said inner part in a normal flight position and unlocking means for releasing said inner part to allow it to pivot freely and take a downwardly inclined position with respect to the normal flight position at the time of take-off, (e) said locking and unlocking means comprising a linkage, comprising bell-crank levers having a friction device. (f) the tail unit further having first and second outer parts, each comprising a crank pin operated by a link articulated to a bell-crank lever which forms part of said linkage, the movements of the bell-crank levers of the first and second outer parts being synchronized by said linkage.
Claim 4
Dependent Claim
174 words
An autogyro, comprising: (a) a rotor having a plane of rotation, (b) a propeller (c) a tail unit having at least one inner plane part located in the well of wind of the rotor and the propeller, said inner part having a transverse axis of pivoting which is substantially parallel to said plane of rotation and being mounted for freely pivoting about said axis, (d) locking means for locking said inner part in a normal flight position and unlocking means for releasing said inner part to allow it to pivot freely and take a downwardly inclined position with respect to the normal flight position at the time of take-off, (e) said locking and unlocking means comprising a linkage, comprising bell-crank levers having a friction device. (f) the tail unit further having first and second outer parts, each comprising a crank pin operated by a link articulated to a bell-crank lever which forms part of said linkage, the movements of the bell-crank levers of the first and second outer parts being synchronized by said linkage.
Claim 5
Dependent Claim
32 words
An autogyro as claimed in claim 2, wherein said inner part comprises two crank pins operated by two links articulated to the bell-crank levers, carrying the links which operate the outer parts.
Claim 6
Dependent Claim
21 words
An autogyro as claimed in claim 3, wherein said two links which operate the inner part are articulated in oblong apertures.
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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) | 1994-08-26 | 1995-02-25 | 1995-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-26 | 1999-02-25 | 1999-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-26 | 2003-02-25 | 2003-08-27 | $7700.00 | Window Closed / Lapsed |