Patent US4921403A successfully refreshed from Google Patents.
US4921403A
Expired / Lapsed
US
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Propeller blade assembly
Assignee: Dowty Rotol Ltd
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Filing: 1989-01-12
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Granted: 1990-05-01
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Expires: 2009-01-12
Abstract
Abstract A propeller blade assembly which enables the mounting of a propeller blade in a hub assembly includes a bearing arrangement that circumferentially surrounds and engages with a section of the propeller blade. The bearing arrangement comprises an inner race assembly of angular contact bearings, and an outer race assembly of roller bearings. The roller bearings being arranged so that the axis of rotation thereof is substantially parallel to the longitudinal axis of the propeller blade.
Inventors
- 👤 Michael Poucher
- 👤 Roger W. Seeley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:53
CPC Classifications
F; F16; F16C; F16C19/00; F16C19/54; B; B64; B64C; B64C11/00; B64C11/02; B64C11/04; B64C11/06; F16C2326/00; F16C2326/43
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
144 words
A propeller blade root assembly for mounting of a propeller blade, said blade root assembly comprising a split hub and an anti-friction bearing arrangement adapted to circumferentially surround and engage a section of a propeller blade received in said assembly, said anti-friction bearing arrangement consisting essentially of an inner race assembly having a single race; and an outer race assembly having a single race and spaced longitudinally from the inner race assembly; said inner race being filled with a plurality of angular contact bearings and said outer race being filled with a plurality of roller bearings, each of said plurality of roller bearings having an axis of rotation substantially parallel to the axis of rotation of a propeller blade received in said blade route assembly, wherein said angular contact bearings and said roller bearings of said bearing arrangement are free of any preloading forces.
Claim 2
Dependent Claim
144 words
A propeller blade root assembly for mounting of a propeller blade, said blade root assembly comprising a split hub and an anti-friction bearing arrangement adapted to circumferentially surround and engage a section of a propeller blade received in said assembly, said anti-friction bearing arrangement consisting essentially of an inner race assembly having a single race; and an outer race assembly having a single race and spaced longitudinally from the inner race assembly; said inner race being filled with a plurality of angular contact bearings and said outer race being filled with a plurality of roller bearings, each of said plurality of roller bearings having an axis of rotation substantially parallel to the axis of rotation of a propeller blade received in said blade route assembly, wherein said angular contact bearings and said roller bearings of said bearing arrangement are free of any preloading forces.
Claim 3
Dependent Claim
30 words
The propeller blade root assembly according to claim 1, wherein said inner race assembly will be adjacent a proximate end of a propeller blade received in said blade root assembly.
Claim 4
Dependent Claim
18 words
The propeller blade root assembly according to claim 1, wherein said assembly is free of any screw threading.
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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) | 1993-04-30 | 1993-10-30 | 1994-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-30 | 1997-10-30 | 1998-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-30 | 2001-10-30 | 2002-05-01 | $7700.00 | Window Closed / Lapsed |