Patent US4178130A successfully refreshed from Google Patents.
US4178130A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helicopter rotor having lead-lag damper operable with pitch and flap decoupling
Assignee: RTX Corp
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Filing: 1977-11-07
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Granted: 1979-12-11
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Expires: 1997-11-07
Abstract
Abstract A helicopter rotor having at least one blade projecting from the central hub and mounted for pitch change, flapping and lead-lag motion and including a lead-lag damper mounted to be pivotally movable in a selected plane and connected to the blade through a pivotal link connection to avoid the adverse effects of pitch and flap coupling.
Inventors
- 👤 Donald L. Ferris
- 👤 William L. Noehren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:02
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/51
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
191 words
A helicopter rotor including: 1. a hub mounted for rotation about an axis of rotation, 2. at least one helicopter blade projecting from said hub and having an inboard end adjacent the hub and an outboard end away from the hub, 3. means supporting said blade inboard end from said hub so that said blade will rotate with said hub about said axis of rotation and so that said blade is capable of universal motion with respect to said hub about intersecting lead-lag and flapping axes, and for pitch change motion with respect to said hub about a pitch change axis intersecting said lead-lag and flapping axes, 4. a lead-lag damper supported from said hub so as to be movable in pivot motion in a trajectory lying substantially in a selected plane with respect to said hub, 5. link means extending between said lead-lag damper and said blade, 6. a universal connection connecting said link means to said lead-lag damper, and 7. means pivotally connecting said link means to said blades for pivot motion therebetween about a pivot axis offset from at least one of said pitch change and flapping axes.
Claim 2
Dependent Claim
191 words
A helicopter rotor including: 1. a hub mounted for rotation about an axis of rotation, 2. at least one helicopter blade projecting from said hub and having an inboard end adjacent the hub and an outboard end away from the hub, 3. means supporting said blade inboard end from said hub so that said blade will rotate with said hub about said axis of rotation and so that said blade is capable of universal motion with respect to said hub about intersecting lead-lag and flapping axes, and for pitch change motion with respect to said hub about a pitch change axis intersecting said lead-lag and flapping axes, 4. a lead-lag damper supported from said hub so as to be movable in pivot motion in a trajectory lying substantially in a selected plane with respect to said hub, 5. link means extending between said lead-lag damper and said blade, 6. a universal connection connecting said link means to said lead-lag damper, and 7. means pivotally connecting said link means to said blades for pivot motion therebetween about a pivot axis offset from at least one of said pitch change and flapping axes.
Claim 3
Dependent Claim
28 words
A helicopter rotor according to claim 1 wherein said pivot axis of said pivotal connecting means is offset from both said pitch change axis and said flapping axis.
Claim 4
Dependent Claim
18 words
A helicopter rotor according to claim 2 wherein said pivot axis is parallel to said pitch change axis.
Claim 5
Dependent Claim
18 words
A helicopter rotor according to claim 2 wherein said pivot axis is perpendicular to said pitch change axis.
Claim 6
Dependent Claim
24 words
A helicopter rotor according to claim 1 wherein said pivot axis is concentric with said pitch change axis and offset from said flapping axis.
Claim 7
Dependent Claim
36 words
A helicopter rotor according to claim 1 wherein said lead-lag damper is a cylinder-piston with rod mechanism with the cylinder portion thereof connected to said hub and the piston portion thereof connected to the link member.
Claim 8
Dependent Claim
19 words
A helicopter rotor according to claim 6 and including means to pivotally connect said damper cylinder to the hub.
Claim 9
Dependent Claim
24 words
A helicopter rotor according to claim 7 wherein said damper cylinder is pivotally connected to said hub at a station along the cylinder length.
References Cited (Backward Citations)
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US2755871A
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US2815821A
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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) | 1982-12-10 | 1983-06-11 | 1983-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-10 | 1987-06-11 | 1987-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-10 | 1991-06-11 | 1991-12-11 | $7700.00 | Window Closed / Lapsed |