US3883267A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blades made of composite fibrous material, for fluid dynamic machines
Assignee: Safran Aircraft Engines SAS
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Filing: 1973-08-06
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Granted: 1975-05-13
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Expires: 1993-08-06
Abstract
Abstract A blade for a fluid dynamic machine, said blade comprising an air-foil section constituted by the superimposition upon a metal core, of a plurality of superimposed layers of composite fibrous material, said metal core having a portion which projects beyond said airfoil section in order to act as a blade attachment root, wherein said layers of composite fibrous material are arranged each with an orientation such that the angle Alpha made between the general direction of the fibres in a layer and the axis of the blade, diminishes, in absolute value, from a maximum value for the innermost layer or layers which are next to the core to a minimum value for the outermost layer or layers which are next to the surface of the airfoil section.
Inventors
- 👤 Claude Paul Baudier
- 👤 Jean Georges Bouiller
- 👤 Pierre Michel Teysseyre
- 👤 Claude Zabukovec
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:12
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/28; F01D5/282; F05; F05D; F05D2300/00; F05D2300/60; F05D2300/603; F05D2300/6034
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
136 words
In a blade for a fluid dynamic machine, said blade comprising an airfoil section having a root-to-tip centroidal axis and constituted by the superimposition, upon a metal core, of a plurality of superimposed layers of composite fibrous material, and a root section constituted by a metal portion integral with and projecting from said metal core beyond said airfoil section, the improvement wherein said layers of composite fibrous material are arranged each with an orientation such that the angle Alpha made between the general direction of the fibers in a layer and said axis of the blade, diminishes, in absolute value, from a maximum value for the innermost layer or layers which are next to the core, to a minimum value for the outermost layer or layers which are next to the surface of the airfoil section.
Claim 2
Dependent Claim
136 words
In a blade for a fluid dynamic machine, said blade comprising an airfoil section having a root-to-tip centroidal axis and constituted by the superimposition, upon a metal core, of a plurality of superimposed layers of composite fibrous material, and a root section constituted by a metal portion integral with and projecting from said metal core beyond said airfoil section, the improvement wherein said layers of composite fibrous material are arranged each with an orientation such that the angle Alpha made between the general direction of the fibers in a layer and said axis of the blade, diminishes, in absolute value, from a maximum value for the innermost layer or layers which are next to the core, to a minimum value for the outermost layer or layers which are next to the surface of the airfoil section.
Claim 3
Dependent Claim
20 words
A blade as claimed in claim 1, in which said maximum value ranges, in absolute terms, between 50* and 60*.
Claim 4
Dependent Claim
20 words
A blade as claimed in claim 1, in which said minimum value ranges, in absolute terms, between 0* and 20*.
Claim 5
Dependent Claim
27 words
A blade as claimed in claim 1, in which two adjacent layers are arranged respectively at an angle of orientation of plus Alpha and minus Alpha .
Claim 6
Dependent Claim
190 words
In a blade for a fluid dynamic machine, said blade comprising an airfoil section having a root-to-tip centroidal axis and constituted by the superimposition, upon a metal core, of a plurality of superimposed layers of composite fibrous material, and a root section constituted by a metal portion integral with and projecting from said metal core beyond said airfoil section, the improvement wherein said layers of composite fibrous material are arranged each with an orientation such that the angle Alpha made between the general direction of the fibers in a layer and said axis of the blade, diminishes, in absolute value, from a maximum value for the innermost layer or layers which are next to the core, to a minimum value for the outermost layer or layers which are next to the surface of the airfoil section, and wherein said layers are superimposed in accordance with a stepped disposition such that one layer, in relation to an adjacent underlying layer, has a portion offset in the direction of the blade root, said offset portion forming a step by which the layer in question is attached to the core of the blade.
Claim 7
Dependent Claim
190 words
In a blade for a fluid dynamic machine, said blade comprising an airfoil section having a root-to-tip centroidal axis and constituted by the superimposition, upon a metal core, of a plurality of superimposed layers of composite fibrous material, and a root section constituted by a metal portion integral with and projecting from said metal core beyond said airfoil section, the improvement wherein said layers of composite fibrous material are arranged each with an orientation such that the angle Alpha made between the general direction of the fibers in a layer and said axis of the blade, diminishes, in absolute value, from a maximum value for the innermost layer or layers which are next to the core, to a minimum value for the outermost layer or layers which are next to the surface of the airfoil section, and wherein said layers are superimposed in accordance with a stepped disposition such that one layer, in relation to an adjacent underlying layer, has a portion offset in the direction of the blade root, said offset portion forming a step by which the layer in question is attached to the core of the blade.
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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) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |