US4022547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite blade employing biased layup
Assignee: General Electric Co
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Filing: 1975-10-02
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Granted: 1977-05-10
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Expires: 1995-10-02
Abstract
Abstract A blade for use in a fluid flow machine such as a compressor or fan is fabricated by laying up and bonding together a plurality of filament laminates. The filaments of at least a portion of the laminates are skewed, in a chordwise direction, forward and aft of a non-radial blade axis, thus forming a biased layup with the blade center of twist biased forward or aft of the blade radial axis. This significantly increases the torsional frequency of the blade. In one embodiment, the filaments are skewed forward such that no filaments run from the blade leading edge to the blade tip but, rather, from the blade leading edge to the blade root. This orientation permits more strain produced by foreign object impact to be transmitted to the blade root where it can be more easily absorbed and dissipated by the blade supporting disc.
Inventors
- 👤 Max W. Stanley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:10
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/28; F01D5/282; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
37 words
A blade for use in a fluid flow machine comprising a plurality of filament laminates bonded together to form the blade, said filament laminates having an axis of symmetry which is skewed from the blade longitudinal axis.
Claim 2
Dependent Claim
37 words
A blade for use in a fluid flow machine comprising a plurality of filament laminates bonded together to form the blade, said filament laminates having an axis of symmetry which is skewed from the blade longitudinal axis.
Claim 3
Dependent Claim
19 words
The blade of claim 1 wherein said axis of symmetry is skewed forward relative to the blade longitudinal axis.
Claim 4
Dependent Claim
19 words
The blade of claim 1 wherein said axis of symmetry is skewed aft relative to the blade longitudinal axis.
Claim 5
Dependent Claim
23 words
The blade of claim 1 wherein a first portion of the laminates are oriented with their filaments substantially along the blade longitudinal axis.
Claim 6
Dependent Claim
71 words
The blade of claim 1 wherein a first portion of the laminates are oriented with their filaments skewed forward at a first angle to the blade longitudinal axis and a second portion of the laminates are oriented with their filaments skewed forward at a second angle to the blade longitudinal axis, said laminates of the first portion and said laminates of the second portion being bonded together in an alternating relationship.
Claim 7
Dependent Claim
25 words
The blade of claim 1 having a leading edge and a tip, and wherein no filaments extend from the blade leading edge to the tip.
Claim 8
Dependent Claim
24 words
The blade of claim 1 further comprising a metallic core disposed between two adjacent filament laminates to increase the torsional stability of the blade.
Claim 9
Dependent Claim
57 words
A blade having a center of twist for use in a fluid flow machine and comprising a plurality of filament laminates bonded together to form the blade, at least a portion of said filament laminates being skewed in the chordwise direction such that the center of twist is other than along a longitudinal axis of the blade.
Claim 10
Dependent Claim
57 words
A blade having a center of twist for use in a fluid flow machine and comprising a plurality of filament laminates bonded together to form the blade, at least a portion of said filament laminates being skewed in the chordwise direction such that the center of twist is other than along a longitudinal axis of the blade.
Claim 11
Dependent Claim
40 words
The blade of claim 8 wherein said laminates are skewed in the chordwise direction, in an alternating relationship, forward and aft of an axis of symmetry and wherein the axis of symmetry is not a longitudinal axis of the blade.
Claim 12
Dependent Claim
19 words
The blade of claim 9 wherein said axis of symmetry is skewed forward relative to the blade longitudinal axis.
Claim 13
Dependent Claim
24 words
The blade of claim 8 wherein the blade center of twist is shifted forward, in a chordwise direction, relative to the blade longitudinal axis.
Claim 14
Dependent Claim
54 words
A blade for use in a fluid flow machine and comprising a plurality of filament laminates bonded together to form the blade, the filaments of adjacent laminates being skewed in the chordwise direction relative to each other, forward and aft, of a non-radial axis of symmetry thereby increasing the torsional stability of the blade.
Claim 15
Dependent Claim
54 words
A blade for use in a fluid flow machine and comprising a plurality of filament laminates bonded together to form the blade, the filaments of adjacent laminates being skewed in the chordwise direction relative to each other, forward and aft, of a non-radial axis of symmetry thereby increasing the torsional stability of the blade.
Claim 16
Dependent Claim
49 words
In a method of fabricating a blade for use in a fluid flow machine, the blade comprising a plurality of filament laminates bonded together to form the blade, the step of orienting the filament laminates to create an axis of symmetry which is skewed from the blade longitudinal axis.
Claim 17
Dependent Claim
49 words
In a method of fabricating a blade for use in a fluid flow machine, the blade comprising a plurality of filament laminates bonded together to form the blade, the step of orienting the filament laminates to create an axis of symmetry which is skewed from the blade longitudinal axis.
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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) | 1980-05-09 | 1980-11-08 | 1981-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-09 | 1984-11-08 | 1985-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-09 | 1988-11-08 | 1989-05-10 | $7700.00 | Window Closed / Lapsed |