US3576377A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blades for fluid flow machines
Assignee: Rolls Royce PLC
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Filing: 1968-12-13
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Granted: 1971-04-27
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Expires: 1988-12-13
Abstract
Abstract In a bladed rotor for a gas turbine engine each blade in a turbine blade ring has a shroud portion which is adapted to abut the next adjacent shroud portions of blades in the blade ring. The abutting surfaces are provided by the wear-resistant ends of a bridgepiece which fits over the shroud and is brazed into position.
Inventors
- 👤 Michael Hargreaves Beanland
- 👤 Michael Anthony Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:42
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/22; F01D5/225; Y; Y02; Y02T; Y02T50/00; Y02T50/60; Y10; Y10S; Y10S416/00; Y10S416/50
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
120 words
A blade for a fluid flow machine, a shroud portion at the tip of the blade, said shroud being adapted to extend circumferentially when the blade is positioned in a ring of blades and terminating in circumferentially opposite end faces, a bridgepiece connected to the shroud portion and extending between said end faces, the bridgepiece having end portions which are made of material having greater wear resistance than the blade, which end portions are positioned over the end faces of the shroud portion, so that the end portions of the bridgepiece provide abutment surfaces for abutment with corresponding surfaces provided on he shroud portions of adjacent blades of said ring blades, said bridgepiece being replaceable without detriment to the blade.
Claim 2
Dependent Claim
120 words
A blade for a fluid flow machine, a shroud portion at the tip of the blade, said shroud being adapted to extend circumferentially when the blade is positioned in a ring of blades and terminating in circumferentially opposite end faces, a bridgepiece connected to the shroud portion and extending between said end faces, the bridgepiece having end portions which are made of material having greater wear resistance than the blade, which end portions are positioned over the end faces of the shroud portion, so that the end portions of the bridgepiece provide abutment surfaces for abutment with corresponding surfaces provided on he shroud portions of adjacent blades of said ring blades, said bridgepiece being replaceable without detriment to the blade.
Claim 3
Dependent Claim
25 words
A blade as claimed in claim 1, wherein the whole of the bridgepiece is made from the material having greater wear resistance than the blade.
Claim 4
Dependent Claim
113 words
A bladed rotor comprising a rotor member, a plurality of bladeS mounted on the rotor member, each blade having a shroud portion at its tip which extends circumferentially of the rotor, and terminates in circumferentially opposite end faces, a bridgepiece connected to the shroud portion and extending circumferentially of the rotor, the bridgepiece having end portions which are made of a material having greater wear resistance than the blade, which end portions are positioned over the end faces of the shroud portion and provide abutment surfaces which abut corresponding surfaces provided on the shroud portions of adjacent blades of the rotor, said bridgepiece and end portions being replaceable to provide new abutment surfaces.
Claim 5
Dependent Claim
113 words
A bladed rotor comprising a rotor member, a plurality of bladeS mounted on the rotor member, each blade having a shroud portion at its tip which extends circumferentially of the rotor, and terminates in circumferentially opposite end faces, a bridgepiece connected to the shroud portion and extending circumferentially of the rotor, the bridgepiece having end portions which are made of a material having greater wear resistance than the blade, which end portions are positioned over the end faces of the shroud portion and provide abutment surfaces which abut corresponding surfaces provided on the shroud portions of adjacent blades of the rotor, said bridgepiece and end portions being replaceable to provide new abutment surfaces.
Claim 6
Dependent Claim
27 words
A bladed rotor according to claim 3 wherein the abutment surfaces of the bridgepieces on two adjacent shroud portions provide an interference fit between the shroud portions.
Claim 7
Dependent Claim
138 words
A blade for a fluid flow machine, a shroud portion at the tip of the blade, said shroud being adapted to extend circumferentially when the blade is positioned in a ring of blades and terminating in circumferentially opposite end faces, a bridgepiece connected to the shroud portion and extending between said end faces, the bridgepiece having end portions which are made of material having greater wear resistance than the blade, which end portions are positioned over the end faces of the shroud portion, so that the end portions of the bridgepiece provide abutment surfaces for abutment with corresponding surfaces provided on the shroud portions of adjacent blades of said ring of blades, the areas of the abutment surfaces of the bridgepiece being greater than the areas of the end faces of the shroud portion over which they fit.
Claim 8
Dependent Claim
138 words
A blade for a fluid flow machine, a shroud portion at the tip of the blade, said shroud being adapted to extend circumferentially when the blade is positioned in a ring of blades and terminating in circumferentially opposite end faces, a bridgepiece connected to the shroud portion and extending between said end faces, the bridgepiece having end portions which are made of material having greater wear resistance than the blade, which end portions are positioned over the end faces of the shroud portion, so that the end portions of the bridgepiece provide abutment surfaces for abutment with corresponding surfaces provided on the shroud portions of adjacent blades of said ring of blades, the areas of the abutment surfaces of the bridgepiece being greater than the areas of the end faces of the shroud portion over which they fit.
Claim 9
Independent Claim
129 words
A method of making a blade for use in a bladed rotor of a fluid flow machine, comprising the steps of: forming a blade with a shroud portion at its top extending circumferentially when the blade is viewed in a ring of blades; forming circumferentially opposite end faces on said shroud portion; forming a bridgepiece having end portions of a material which has greater wear resistance than the material of the end faces of the shroud; locating the bridgepiece end portions in overlying relation to the end faces of the shroud by placing the bridgepiece over the blade shroud portion; affixing the end portions of the bridgepiece to the end faces of the shroud; and removing at least a portion of the bridgepiece after the end portions are affixed.
Claim 10
Independent Claim
129 words
A method of making a blade for use in a bladed rotor of a fluid flow machine, comprising the steps of: forming a blade with a shroud portion at its top extending circumferentially when the blade is viewed in a ring of blades; forming circumferentially opposite end faces on said shroud portion; forming a bridgepiece having end portions of a material which has greater wear resistance than the material of the end faces of the shroud; locating the bridgepiece end portions in overlying relation to the end faces of the shroud by placing the bridgepiece over the blade shroud portion; affixing the end portions of the bridgepiece to the end faces of the shroud; and removing at least a portion of the bridgepiece after the end portions are affixed.
References Cited (Backward Citations)
US3185441A
Cited
US3304056A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |