US4533298A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Turbine blade with integral shroud
Assignee: Westinghouse Electric Corp
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Filing: 1982-12-02
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Granted: 1985-08-06
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Expires: 2002-12-02
Abstract
Abstract A circular array of rotatable blades formed from blades having an integral shroud with a leading planar surface and a trailing planar surface, the leading planar surface being generally parallel to an axial radial plane passing through the center of the root of the blade and the trailing planar surface, if extended, intersecting the axial radial plane passing through the center of the root of the blade to form an angle generally equal in degrees to 360 divided by the number of blades forming the circular array.
Inventors
- 👤 Albert J. Partington
- 👤 Ronald E. Warner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:26
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/22; F01D5/225; F05; F05D; F05D2250/00; F05D2250/10; F05D2250/14; F05D2250/141
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
130 words
A plurality of rotatable blades to be disposed in a circular array on a turbine rotor, said blades comprising a root portion which fastens said blades to said rotor, an air foil shaped blade portion having a leading edge and a trailing edge and a shroud portion made integral with the blade portion and disposed on the radially outer end of the blade portion; said shroud portion having a first planar surface and a second planar surface, the first planar surface being disposed generally parallel to an axial radial plane passing through the central portion of the root portion and the second planar surface if extended forming an angle with said axial radial plane generally equal in degrees to 360 divided by the number of blades forming said circular array.
Claim 2
Dependent Claim
130 words
A plurality of rotatable blades to be disposed in a circular array on a turbine rotor, said blades comprising a root portion which fastens said blades to said rotor, an air foil shaped blade portion having a leading edge and a trailing edge and a shroud portion made integral with the blade portion and disposed on the radially outer end of the blade portion; said shroud portion having a first planar surface and a second planar surface, the first planar surface being disposed generally parallel to an axial radial plane passing through the central portion of the root portion and the second planar surface if extended forming an angle with said axial radial plane generally equal in degrees to 360 divided by the number of blades forming said circular array.
Claim 3
Dependent Claim
24 words
A plurality of blades as set forth in claim 1, wherein the first planar surface is generally on the leading side of the blade.
Claim 4
Dependent Claim
24 words
A plurality of blades as set forth in claim 2, wherein the first planar surface extends slightly beyond the blade portion of the blades.
Claim 5
Dependent Claim
28 words
A plurality of blades as set forth in claim 2, wherein the trailing end of the blade portion extends beyond the second planar surface on said shroud portions.
References Cited (Backward Citations)
US782132A
Cited
GB369127A
Cited
FR684946A
Cited
US2221685A
Cited
US2221679A
Cited
US2510734A
Cited
US2681500A
Cited
US3185441A
Cited
US3328867A
Cited
DE1299004B
Cited
US4211516A
Cited
US4076455A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-05 | 1989-02-04 | 1989-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-05 | 1993-02-04 | 1993-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-05 | 1997-02-04 | 1997-08-06 | $7700.00 | Window Closed / Lapsed |