Patent US4183718A successfully refreshed from Google Patents.
US4183718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotor for a rotary wing aircraft
Assignee: Airbus Helicopters Deutschland GmbH
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Filing: 1977-11-29
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Granted: 1980-01-15
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Expires: 1997-11-29
Abstract
Abstract A rotor for a rotary wing aircraft includes a rotor head and an even number of rotor blades arranged in pairs about the rotor head. The rotor blades of each pair are located diametrically opposite each other and each blade has a root end positioned radially inwardly toward the head. Bearings carried by the rotor head pivotally support each of the rotor blades. A torsionally elastic connection member extends between and connects the roots of a pair of rotor blades, and the connection member is mounted at its longitudinal center in the rotor head for pivotal movement about its longitudinal axis.
Inventors
- 👤 Karlheinz Mautz
- 👤 Emil Weiland
- 👤 Alois Schwarz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:51
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/37; B64C27/45
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
167 words
A rotor for a rotary wing aircraft comprising a rotor head having an axis of rotation, an even number of rotor blades arranged in pairs about and extending radially outwardly from said rotor head and extending transversely of the axis of rotation of said rotor head, said rotor blades of each pair being located on diametrically opposite sides of the axis of rotation of said rotor head and each said blade having a root positioned on the radially inner end thereof spaced radially outwardly from the axis of rotation of said rotor head, roller bearings carried by said rotor head pivotally supporting each of said rotor blades, a torsionally elastic connection member extending through said rotor head and between and connecting the roots of a pair of rotor blades, and bearing means supporting said connection member at its longitudinal center in said rotor head concentric to the axis of rotation of said rotor head for providing pivotal movement of said connection member about the longitudinal axis thereof.
Claim 2
Dependent Claim
167 words
A rotor for a rotary wing aircraft comprising a rotor head having an axis of rotation, an even number of rotor blades arranged in pairs about and extending radially outwardly from said rotor head and extending transversely of the axis of rotation of said rotor head, said rotor blades of each pair being located on diametrically opposite sides of the axis of rotation of said rotor head and each said blade having a root positioned on the radially inner end thereof spaced radially outwardly from the axis of rotation of said rotor head, roller bearings carried by said rotor head pivotally supporting each of said rotor blades, a torsionally elastic connection member extending through said rotor head and between and connecting the roots of a pair of rotor blades, and bearing means supporting said connection member at its longitudinal center in said rotor head concentric to the axis of rotation of said rotor head for providing pivotal movement of said connection member about the longitudinal axis thereof.
Claim 3
Dependent Claim
39 words
The rotor according to claim 1 wherein said bearing means for mounting said connection member in said rotor head for pivotal movement comprises a bearing which is compression located in the longitudinal direction of said torsionally elastic connection member.
Claim 4
Dependent Claim
24 words
The rotor according to claim 2 wherein said bearing is a spherical bearing coaxially positioned with the axis of rotation of said rotor head.
Claim 5
Dependent Claim
13 words
The rotor according to claim 3 wherein said bearing is an elastomer bearing.
References Cited (Backward Citations)
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Cited
GB1190259A
Cited
US3578877A
Cited
US3504989A
Cited
US3610774A
Cited
US3824037A
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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) | 1983-01-14 | 1983-07-16 | 1984-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-14 | 1987-07-16 | 1988-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-14 | 1991-07-16 | 1992-01-15 | $7700.00 | Window Closed / Lapsed |