Patent US4688992A successfully refreshed from Google Patents.
US4688992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blade platform
Assignee: General Electric Co
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Filing: 1985-01-25
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Granted: 1987-08-25
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Expires: 2005-01-25
Abstract
Abstract The present invention discloses a turbomachinery blading configuration. The configuration includes a circumferential recess in a blade support structure and a plurality of blades. Each blade has a platform for mounting the blade within the recess. Each platform includes oppositely directed, generally circumferentially facing edges, each edge having a first and second axial surfaces separated by a recess. The surfaces contact matching surfaces on adjacent blades thereby determining predictable load paths for tangential and twisting moment reaction forces acting on the blades.
Inventors
- 👤 Ralph A. Kirkpatrick
- 👤 Kenneth Willgoose
- 👤 Omer D. Erdmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:47
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/30; F01D5/3023; F01D5/303; F01D5/3038
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
101 words
A platform for a circumferentially loaded blade comprising: axially facing tangs for mounting said platform within a circumferential recess in a blade support structure, oppositely directed and generally circumferentially facing edges, each of said edges including first and second axial surfaces separated by a relief extending radially throughout said platform for contacting matching surfaces on adjacent blades, each of said first and second axial surfaces being disposed on said tangs, said relief being greater in axial length than said first and second axial surfaces for allowing substantially all circumferential forces acting on said platform to be transmitted solely through said surfaces.
Claim 2
Dependent Claim
101 words
A platform for a circumferentially loaded blade comprising: axially facing tangs for mounting said platform within a circumferential recess in a blade support structure, oppositely directed and generally circumferentially facing edges, each of said edges including first and second axial surfaces separated by a relief extending radially throughout said platform for contacting matching surfaces on adjacent blades, each of said first and second axial surfaces being disposed on said tangs, said relief being greater in axial length than said first and second axial surfaces for allowing substantially all circumferential forces acting on said platform to be transmitted solely through said surfaces.
Claim 3
Dependent Claim
19 words
A platform, as recited in claim 1, wherein said first and second surfaces of each edge are generally coplanar.
Claim 4
Dependent Claim
19 words
A platform, as recited in claim 1, wherein said first and second surfaces of each edge are circumferentially offset.
Claim 5
Dependent Claim
100 words
A turbomachinery blading configuration comprising: an annular casing with a circumferential recess disposed therein, said recess including axially opposite circumferential slots; and a plurality of blades, each having a platform with axially facing tangs adapted to mate with said slots; each of said tangs including circumferentially facing surfaces for contacting matching surfaces on adjacent blades, each of said surfaces being separated by a relief extending radially throughout said platform, said relief being greater in axial length than said first and second axial surfaces for allowing substantially all circumferential forces acting on said platform to be transmitted solely through said surfaces.
Claim 6
Dependent Claim
100 words
A turbomachinery blading configuration comprising: an annular casing with a circumferential recess disposed therein, said recess including axially opposite circumferential slots; and a plurality of blades, each having a platform with axially facing tangs adapted to mate with said slots; each of said tangs including circumferentially facing surfaces for contacting matching surfaces on adjacent blades, each of said surfaces being separated by a relief extending radially throughout said platform, said relief being greater in axial length than said first and second axial surfaces for allowing substantially all circumferential forces acting on said platform to be transmitted solely through said surfaces.
Claim 7
Dependent Claim
16 words
A configuration, as recited in claim 4, wherein adjacent platforms mutually contact solely on said surfaces.
Claim 8
Dependent Claim
16 words
A configuration, as recited in claim 4, wherein said tangs of each platform are circumferentially aligned.
Claim 9
Dependent Claim
16 words
A configuration, as recited in claim 4, wherein said tangs of each platform are circumferentially offset.
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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) | 1990-08-24 | 1991-02-23 | 1991-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-24 | 1995-02-23 | 1995-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-24 | 1999-02-23 | 1999-08-25 | $7700.00 | Window Closed / Lapsed |