US4257743A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coupling devices of moving blades of steam turbines
Assignee: Toshiba Corp
•
Filing: 1979-03-12
•
Granted: 1981-03-24
•
Expires: 1999-03-12
Abstract
Abstract A coupling device of moving blades of a steam turbine comprises a pair of projections provided on the inner and outer surfaces of the adjacent moving blades. One of the projections is provided with a hemispherical recess which loosely and slidably receives a corresponding hemispherical projection provided for the other projection when the moving blades are assembled.
Inventors
- 👤 Michinobu Fujii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:07
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/22; Y; Y10; Y10S; Y10S416/00; Y10S416/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A coupling device which couples adjacent turbine blades, said blades extending radially from a turbine wheel, said coupling device comprising opposing inner and outer blade surfaces; a pair of projections integrally on opposing inner and outer blade surfaces, said projections extending from the blade surfaces circumferentially about the turbine wheel; a hemispherical projection on one of said projections, a hemispherical recess on the opposing projection; said hemispherical projection loosely engaging said hemispherical recess on the adjacent blade such that when said turbine wheel is at rest, there is some clearance between the hemispherical projection and the hemispherical recess of the adjacent blade.
Claim 2
Dependent Claim
102 words
A coupling device which couples adjacent turbine blades, said blades extending radially from a turbine wheel, said coupling device comprising opposing inner and outer blade surfaces; a pair of projections integrally on opposing inner and outer blade surfaces, said projections extending from the blade surfaces circumferentially about the turbine wheel; a hemispherical projection on one of said projections, a hemispherical recess on the opposing projection; said hemispherical projection loosely engaging said hemispherical recess on the adjacent blade such that when said turbine wheel is at rest, there is some clearance between the hemispherical projection and the hemispherical recess of the adjacent blade.
References Cited (Backward Citations)
FR69842E
Cited
US3159379A
Cited
US3752599A
Cited
US3719432A
Cited
US3795462A
Cited
US3990813A
Cited
US4083655A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-23 | 1984-09-22 | 1985-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-23 | 1988-09-22 | 1989-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-23 | 1992-09-22 | 1993-03-24 | $7700.00 | Window Closed / Lapsed |