Patent US3572968A successfully refreshed from Google Patents.
US3572968A
Expired / Lapsed
US
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Turbine bucket cover
Assignee: General Electric Co
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Filing: 1969-04-11
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Granted: 1971-03-30
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Expires: 1989-04-11
Abstract
Abstract A damping-type shroud covering for turbine buckets wherein one embodiment consists of a double layer of overlapping cover bands each spanning two adjacent buckets. The inner bands are loosely disposed between buckets whereas the outer layer rigidly joins two buckets. Another embodiment consists of an over and under cover band wherein each cover band is tightly joined to one bucket and loosely joined to the adjacent one.
Inventors
- 👤 Victor S Musick
- 👤 Joseph H Ouellette
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:17
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/22; F01D5/225
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
127 words
In a turbomachine having at least one stage of radially extending buckets and a shroud assembly extending circumferentially around the tips of said buckets, the combination comprising: at least one tenon extending radially from the tip of each of said buckets and having a step with a base portion and a top portion; an outer cover band portion having at least one hole therein, rigidly connected to said tenon top portion; an inner cover band portion having at least one hole therein, loosely connected to said tenon base portion; said cover band portions overlapping one another at the tenon to provide damping and at least one of said cover band portions spanning two adjacent buckets and rigidly connected to said tenon top portion of an adjacent bucket.
Claim 2
Dependent Claim
127 words
In a turbomachine having at least one stage of radially extending buckets and a shroud assembly extending circumferentially around the tips of said buckets, the combination comprising: at least one tenon extending radially from the tip of each of said buckets and having a step with a base portion and a top portion; an outer cover band portion having at least one hole therein, rigidly connected to said tenon top portion; an inner cover band portion having at least one hole therein, loosely connected to said tenon base portion; said cover band portions overlapping one another at the tenon to provide damping and at least one of said cover band portions spanning two adjacent buckets and rigidly connected to said tenon top portion of an adjacent bucket.
Claim 3
Dependent Claim
23 words
A turbomachine bucket and shroud assembly according to claim 1 wherein the tenon top portion is peened over to provide a rigid connection.
Claim 4
Dependent Claim
42 words
A turbomachine bucket and shroud assembly accordiNg to claim 1 wherein a radial clearance is defined between said inner cover band portion and said bucket tip and also a circumferential clearance between said tenon base portion and said inner cover band hole.
Claim 5
Dependent Claim
48 words
A turbomachine bucket and shroud assembly according to claim 1 wherein said outer cover band portion is rigidly connected to the tenon top portions of two adjacent buckets while said inner cover band portion is loosely connected between the tenon base portions of two adjacent and staggered buckets.
Claim 6
Dependent Claim
26 words
A turbomachine bucket and shroud assembly according to claim 4 wherein a clearance space is defined between the ends of said inner and outer cover bands.
Claim 7
Dependent Claim
68 words
A turbomachine bucket and shroud assembly according to claim 1 wherein a cover band segment spans every two adjacent buckets and overlaps an adjacent segment at the tenon to provide said inner and outer cover band portions, one end of the segment being rigidly connected to said tenon top portion of one bucket, the other end being loosely disposed over said tenon base portion of said adjacent bucket.
Claim 8
Dependent Claim
36 words
A turbomachine bucket and shroud assembly according to claim 6 wherein said cover band segment has a curvilinear portion in order to make the transition from said tenon top portion to said adjacent tenon base portion.
References Cited (Backward Citations)
US1129920A
Cited
US1842957A
Cited
GB377101A
Cited
US2221678A
Cited
US3048365A
Cited
US3367629A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |