Patent US3761199A successfully refreshed from Google Patents.
US3761199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helicopter rotor with redundant load carrying capability
Assignee: RTX Corp
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Filing: 1972-07-14
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Granted: 1973-09-25
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Expires: 1992-07-14
Abstract
Abstract A helicopter rotor in which the helicopter blades are mounted for rotation from a rotor hub which is shaped to provide redundant load carrying paths for blade centrifugal loading, torque loading, thrust loading and rotor head moment loading.
Inventors
- 👤 D Ferris
- 👤 R Zincone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:06
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
149 words
A helicopter rotor adapted to support a plurality of helicopter blades from a hub member for rotation therewith about an axis of rotation and wherein said hub member includes: A. a central support member adapted to be driven in rotation about said axis of rotation, B. an outer support member surrounding said central support member and comprising a plurality of straight members positioned about said axis of rotation and connected to form a multi-sided, continuous truss member with adjacent straight members forming apex intersections at their point of connection, C. a plurality of radially extending spoke members extending from said central member to said outer member and connected to each and with each spoke connected to said outer member at a station between adjacent apex intersection, and D. means to support helicopter blades connected to and supported from said outer member at one or more of said apex intersections.
Claim 2
Dependent Claim
149 words
A helicopter rotor adapted to support a plurality of helicopter blades from a hub member for rotation therewith about an axis of rotation and wherein said hub member includes: A. a central support member adapted to be driven in rotation about said axis of rotation, B. an outer support member surrounding said central support member and comprising a plurality of straight members positioned about said axis of rotation and connected to form a multi-sided, continuous truss member with adjacent straight members forming apex intersections at their point of connection, C. a plurality of radially extending spoke members extending from said central member to said outer member and connected to each and with each spoke connected to said outer member at a station between adjacent apex intersection, and D. means to support helicopter blades connected to and supported from said outer member at one or more of said apex intersections.
Claim 3
Dependent Claim
23 words
A rotor according to claim 1 wherein said spokes connect to said outer member at a station substantially midway between adjacent apex intersections.
Claim 4
Dependent Claim
18 words
an outer support member enveloping said inner support member and shaped to form a multi-straight sided truss therearound,
Claim 5
Dependent Claim
18 words
an outer support member enveloping said inner support member and shaped to form a multi-straight sided truss therearound,
Claim 6
Dependent Claim
67 words
a plurality of spoke members extending between and connected to said inner member and said outer member and with a spoke member connected to each straight side of said outer member at a station remote from the ends thereof, and B. means connected to said outer member at the point of intersection between the adjacent straight sides thereof to support a helicopter blade from each such intersection.
Claim 7
Dependent Claim
67 words
a plurality of spoke members extending between and connected to said inner member and said outer member and with a spoke member connected to each straight side of said outer member at a station remote from the ends thereof, and B. means connected to said outer member at the point of intersection between the adjacent straight sides thereof to support a helicopter blade from each such intersection.
Claim 8
Dependent Claim
24 words
A rotor according to claim 2 and wherein said spokes are oriented so as to connect to said straight members in substantially perpendicular fashion.
Claim 9
Dependent Claim
23 words
A roTor according to claim 1 wherein said central member, said spokes and said outer member are connected to form an integral unit.
Claim 10
Dependent Claim
23 words
A rotor according to claim 1 wherein said outer support member is in the shape of a truss having at least three sides.
Claim 11
Dependent Claim
66 words
A rotor according to claim 1 wherein said central support member is a ring member of selected height and wherein said spoke members are part of an upper and lower flange members connected to and projecting from the central member, and wherein said outer support member includes upper and lower flange members connected and supported from the upper and lower flanges of said spoke members, respectively.
Claim 12
Dependent Claim
45 words
A rotor according to claim 1 wherein said helicopter blade support means includes a bearing system including a spherical elastomeric bearing adapted to mount the blade from said hub member for universal motion about the intersection of the blade pitch change, lead-lag and flapping axes.
Claim 13
Dependent Claim
24 words
A rotor according to claim 1 wherein said spoke members constitute the sole support between said central support member and said outer support member.
Claim 14
Dependent Claim
9 words
A helicopter rotor including: A. a hub member having:
Claim 15
Dependent Claim
9 words
A helicopter rotor including: A. a hub member having:
Claim 16
Dependent Claim
23 words
A rotor according to claim 9 wherein said spoke members are the sole support members supporting said outer member from said inner member.
References Cited (Backward Citations)
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Cited
US3292712A
Cited
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Cited
US3700352A
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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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |