US4040770A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transition reinforcement of composite blade dovetails
Assignee: General Electric Co
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Filing: 1975-12-22
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Granted: 1977-08-09
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Expires: 1995-12-22
Abstract
Abstract The composite filament laminates of a composite blade are splayed at the root thereof to receive metallic inserts therebetween. A transition material having a modulus of elasticity greater than that of the inserts and less than that of the laminates is bonded therebetween to more uniformly distribute the blade loadings into the root region.
Inventors
- 👤 Robert G. Carlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:56
CPC Classifications
C; C22; C22C; C22C47/00; F; F01; F01D; F01D5/00; F01D5/12; F01D5/28; F01D5/282; B; B22; B22F; B22F2998/00; Y; Y02; Y02T; Y02T50/00; Y02T50/60; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12444; Y10T428/24; Y10T428/24479; Y10T428/24612; Y10T428/24942; Y10T428/29; Y10T428/2913; Y10T428/2916; Y10T428/2918; Y10T428/31504; Y10T428/31511; Y10T428/31529
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
91 words
In a blade comprising an airfoil and dovetail including a plurality of bonded filament laminates comprising elongated filaments embedded in a matrix material, the laminates being splayed at a location along their length and receiving a metallic insert for bonding therebetween, the improvement comprising a transition material comprising a wire mesh embedded in the same matrix material, bonded along substantially the entire interface between the filament laminates and the insert, said transition material having a modulus of elasticity greater than that of the insert and less than that of the laminates.
Claim 2
Dependent Claim
91 words
In a blade comprising an airfoil and dovetail including a plurality of bonded filament laminates comprising elongated filaments embedded in a matrix material, the laminates being splayed at a location along their length and receiving a metallic insert for bonding therebetween, the improvement comprising a transition material comprising a wire mesh embedded in the same matrix material, bonded along substantially the entire interface between the filament laminates and the insert, said transition material having a modulus of elasticity greater than that of the insert and less than that of the laminates.
Claim 3
Dependent Claim
20 words
The improved blade as recited in claim 1 wherein the transition material comprises a constant volume percent of wire mesh.
Claim 4
Dependent Claim
34 words
The improved blade as recited in claim 1 wherein the transition material includes a gradient of volume percent of wire mesh, wherein the highest volume percent of wire mesh is proximate the metallic element.
Claim 5
Dependent Claim
22 words
The improved blade as recited in claim 1 wherein the transition material comprises a stainless steel wire mesh in an aluminum matrix.
Claim 6
Dependent Claim
22 words
The improved blade as recited in claim 1 wherein the transition material comprises a stainless steel wire mesh in an epoxy matrix.
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) | 1980-08-08 | 1981-02-07 | 1981-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-08 | 1985-02-07 | 1985-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-08 | 1989-02-07 | 1989-08-09 | $7700.00 | Window Closed / Lapsed |