US3918840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compressor for gas turbine engines
Assignee: Rolls Royce PLC
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Filing: 1974-04-18
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Granted: 1975-11-11
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Expires: 1994-04-18
Abstract
Abstract A compressor for gas turbine engines, the compressor having an annular array of blades surrounded by a circumferentially continuous shroud ring having recesses pivotally engaged by extensions of the blades so that the radially outer ends of the blades are supported in normal operation, e.g. against vibration, but if the blades bend under an impact load, e.g. a bird strike, the outer ends can accommodate the bending by their freedom to pivot in the recesses or even by withdrawing therefrom.
Inventors
- 👤 Lional Haworth
- 👤 David Bruce Foweraker
- 👤 Richard Armstrong Foster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:26
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/22; F01D5/225; F04; F04D; F04D29/00; F04D29/26; F04D29/32; F04D29/321; F04D29/322
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
135 words
A compressor for gas turbine engines comprising a rotor body, an array of radial blades connected at their radially inner ends to the body, a circumferentially continuous shroud ring surrounding the blades at the radially outer ends thereof, the blades having an elongate cross-section, a recess provided in a radially inner surface of the ring adjacent said outer end of each blade, the recess being elongate in the direction of elongation of the cross-section of said outer end, an extension provided at the outer end of each blade, the recess and extension being of curved cross-section as seen in said direction of elongation and the recess having sides which are divergent towards the blade to enable the extension to pivot relative to the recess and slide therefrom in consequence of bending forces on the blade.
Claim 2
Dependent Claim
135 words
A compressor for gas turbine engines comprising a rotor body, an array of radial blades connected at their radially inner ends to the body, a circumferentially continuous shroud ring surrounding the blades at the radially outer ends thereof, the blades having an elongate cross-section, a recess provided in a radially inner surface of the ring adjacent said outer end of each blade, the recess being elongate in the direction of elongation of the cross-section of said outer end, an extension provided at the outer end of each blade, the recess and extension being of curved cross-section as seen in said direction of elongation and the recess having sides which are divergent towards the blade to enable the extension to pivot relative to the recess and slide therefrom in consequence of bending forces on the blade.
Claim 3
Dependent Claim
31 words
A compressor according to claim 1, including means arranged between the rotor body and the radially inner ends of the blades for preloading the blades in the direction of their length.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |