Patent US3713752A successfully refreshed from Google Patents.
US3713752A
Expired / Lapsed
US
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Composite blade for a gas turbine engine
Assignee: RTX Corp
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Filing: 1971-10-28
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Granted: 1973-01-30
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Expires: 1991-10-28
Abstract
Abstract A composite fluid-directing element comprises a laminated, filament reinforced fluid-directing blade having a cambered airfoil portion and a sinusoid root portion and a foot member bonded to the root portion and configured for retention in the undercut slot of a turbomachine body. The blade is formed of a plurality of parallel laminations of sheets including sheets of high modulus, high strength reinforcing filaments embedded in a matrix material and aligned in a spanwise direction. The foot member has a radially extending oscillatory wave form opening conforming to the shape of the blade root portion in which the root portion is received in bonded relation.
Inventors
- 👤 A Kurti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:33
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/30
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
111 words
A composite fluid-directing element for mounting on a body of a turbomachine having undercut slots comprising a laminated, filament reinforced fluid-directing blade member having a cambered airfoil portion and a sinusoid root portion, said blade member being formed from a plurality of parallel laminations of sheets including sheets of high modulus, high strength reinforcing filaments embedded in a matrix material and aligned in a spanwise direction, said root portion having a radially extending oscillatory wave form and said blade being adapted for mounting on said body with the airfoil portion extending spanwise of the blade from the slot and the slot extending chordwise of the blade at the root portion thereof.
Claim 2
Dependent Claim
111 words
A composite fluid-directing element for mounting on a body of a turbomachine having undercut slots comprising a laminated, filament reinforced fluid-directing blade member having a cambered airfoil portion and a sinusoid root portion, said blade member being formed from a plurality of parallel laminations of sheets including sheets of high modulus, high strength reinforcing filaments embedded in a matrix material and aligned in a spanwise direction, said root portion having a radially extending oscillatory wave form and said blade being adapted for mounting on said body with the airfoil portion extending spanwise of the blade from the slot and the slot extending chordwise of the blade at the root portion thereof.
Claim 3
Dependent Claim
58 words
The invention of claim 1 wherein said element further includes a foot member bonded to said root portion and configured for retention in said undercut slot in the turbomachine body, saId foot member having a radially extending oscillatory wave form opening conforming to the shape of the root portion of said blade member receiving said root portion therein.
Claim 4
Dependent Claim
24 words
The invention of claim 2 wherein said filaments are selected from the group consisting of silicon carbide, carbon, boron and silicon carbide coated boron.
Claim 5
Dependent Claim
26 words
The invention of claim 3 wherein said sinusoid root portion is in the form of a succession of radially extending waves whose bending radii are equal.
Claim 6
Dependent Claim
28 words
The invention of claim 3 wherein said sinusoid root portion is in the form of a succession of radially inwardly extending waves whose bending radii are progressively diminished.
References Cited (Backward Citations)
US2487879A
Cited
US3600103A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |