US3950115A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastics rotor blade
Assignee: Airbus Group SAS
•
Filing: 1974-11-26
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Granted: 1976-04-13
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Expires: 1994-11-26
Abstract
Abstract A plastics rotor blade, particularly for a helicopter, is formed with elongate filaments or rovings forming a loop for securing to a hub pin. The loop contains a metal socket secured to an extension extending between the loop walls.
Inventors
- 👤 August Hanns Leonhard Euler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:56
CPC Classifications
B; B29; B29D; B29D99/00; B29D99/0025; B29D99/0028; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/08; B29C70/083; B29C70/28; B29C70/30; B29C70/34; B29C70/347; B29C70/68; B29C70/86; B29D24/00; B29D24/002; B29D24/005; B64; B64C; B64C27/00; B64C27/32; B64C27/46; B64C27/473; B29L; B29L2031/00; B29L2031/08; B29L2031/082; B29L2031/30; B29L2031/3047; B64C2027/4733; B64C2027/4736; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
152 words
A high strength rotor blade comprising longitudinal rovings forming a rigid skein loop in the vicinity of the blade base or root thereby enabling said blade to be secured by a pin to a hub member, said blade further comprising a metal mounting member including a socket through which said pin may extend and a longitudinal extension of tapering configuration, said rovings extending away from said loop into bifurcate portions, said longitudinal rovings being arranged in said blade with said loop extending around said socket and said longitudinal extension being disposed between and in engagement with said bifurcate portions of said rovings, said rovings and extension being assembled in said blade by a compact filling consisting of a mineral loading agent and an adhesive, the filling being connected to the blade hub, the rovings being applied to the filling as they extend away from said blade root and separate into bifurcate portions.
Claim 2
Dependent Claim
152 words
A high strength rotor blade comprising longitudinal rovings forming a rigid skein loop in the vicinity of the blade base or root thereby enabling said blade to be secured by a pin to a hub member, said blade further comprising a metal mounting member including a socket through which said pin may extend and a longitudinal extension of tapering configuration, said rovings extending away from said loop into bifurcate portions, said longitudinal rovings being arranged in said blade with said loop extending around said socket and said longitudinal extension being disposed between and in engagement with said bifurcate portions of said rovings, said rovings and extension being assembled in said blade by a compact filling consisting of a mineral loading agent and an adhesive, the filling being connected to the blade hub, the rovings being applied to the filling as they extend away from said blade root and separate into bifurcate portions.
Claim 3
Dependent Claim
40 words
The improved blade according to claim 1 wherein the extension has in the direction of the blade chord a flat portion which extends around the socket, forming a plate perpendicular to the axis thereof, and which tapers towards the blade.
Claim 4
Dependent Claim
46 words
The improved blade according to claim 2, wherein the flat portion has on each of its surfaces a central rib connected to the socket and tapering as it extends away therefrom so that the cross-section of the socket extension is cruciform and tapers towards the blade.
Claim 5
Dependent Claim
22 words
The improved blade according to claim 1, wherein the metal mounting member is covered by an intermediate layer of high-stick shear-resistant laminate.
Claim 6
Dependent Claim
18 words
The improved blade according to claim 1, wherein the filling consists of synthetic resin and small glass fragments.
Claim 7
Dependent Claim
32 words
The improved blade according to claim 1 wherein a portion of the rovings extending from the loop towards the trailing edge comes to the surface of the filling towards the leading edge.
Claim 8
Dependent Claim
42 words
The improved blade according to claim 1, wherein the metal mounting member has a projecting lug terminating in a bore which extends parallel to the socket bore and which receives an auxiliary pin preventing the blade from rotating around the main pin.
References Cited (Backward Citations)
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Cited
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GB1166700A
Cited
US3476484A
Cited
US3669566A
Cited
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Cited
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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) | 1979-04-13 | 1979-10-13 | 1980-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-13 | 1983-10-13 | 1984-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-13 | 1987-10-13 | 1988-04-13 | $7700.00 | Window Closed / Lapsed |