US3825984A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for fabricating a hollow blade
Assignee: General Electric Co
•
Filing: 1972-03-02
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Granted: 1974-07-30
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Expires: 1992-03-02
Abstract
Abstract In the fabrication of a hollow fluid flow apparatus blade, such as a turbine blade or vane, there is provided a pair of spaced apart metallic walls defining the trailing edge portion of the blade airfoil, each of the walls having an inner and an outer surface. Each of the walls is perforated with a plurality of openings which are located from wall to wall in pairs of aligned openings. A pin is positioned through each pair of aligned openings while maintaining the walls in spaced apart relationship. Then the pins are joined to the walls through a metallic bond, one example of which is brazing through application of a brazing alloy to the wall outer surface.
Inventors
- 👤 P Linko
- 👤 W Treece
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:52
CPC Classifications
B; B23; B23P; B23P15/00; B23P15/04; F; F01; F01D; F01D5/00; F01D5/12; F01D5/14; F01D5/18; F05; F05D; F05D2260/00; F05D2260/20; F05D2260/221; F05D2260/2212; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/49336; Y10T29/49339; Y10T29/49341
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
145 words
In a method for making a hollow blade for fluid flow apparatus, the blade including an airfoil, the steps of: providing the airfoil with a pair of spaced apart metallic walls defining the trailing edge portion of the airfoil having a hollow interior, each wall having an inner and an outer surface; perforating each of the walls with a plurality of openings located from wall to wall in pairs of aligned openings; positioning a pin through each pair of aligned openings and within the hollow interior, while maintaining the walls in spaced apart relationship to define therebetween a slot open at the trailing edge portion and communicating with the hollow interior; dispersing about the pins, in the hollow interior between the spaced apart walls, a particulate filler material; joining the pins to the walls through a metallic bond; and then removing the particulate filler material.
Claim 2
Dependent Claim
145 words
In a method for making a hollow blade for fluid flow apparatus, the blade including an airfoil, the steps of: providing the airfoil with a pair of spaced apart metallic walls defining the trailing edge portion of the airfoil having a hollow interior, each wall having an inner and an outer surface; perforating each of the walls with a plurality of openings located from wall to wall in pairs of aligned openings; positioning a pin through each pair of aligned openings and within the hollow interior, while maintaining the walls in spaced apart relationship to define therebetween a slot open at the trailing edge portion and communicating with the hollow interior; dispersing about the pins, in the hollow interior between the spaced apart walls, a particulate filler material; joining the pins to the walls through a metallic bond; and then removing the particulate filler material.
Claim 3
Dependent Claim
39 words
In the method of claim 1 in which: the pins are wires having a portion which protrudes from the wall outer surface during joining; the protruding portions of the wires being removed at the wall outer surface after joining.
Claim 4
Dependent Claim
64 words
In the method of claim 1 in which: a brazing alloy is applied to the outer surfaces of the walls about the pins after positioning of a pin through each pair of aligned openings, the brazing alloy having a brazing temperature less than that which will affect detrimentally the strength properties of the walls; and then joining the pins to the walls by brazing.
Claim 5
Dependent Claim
31 words
In the method as in claim 1 in which the size of particles of the particulate filler material are larger than gaps between the pins and the openings in the walls.
Claim 6
Dependent Claim
88 words
In a method for making an article having a hollow interior, a gap communicating with the hollow interior, and a plurality of members brazed across the gap therebetween, each member having an outer surface, the steps of: positioning the plurality of members across the gap; dispersing within the hollow interior at the outer surface a particulate filler material the particles of which generally are greater in size than the gap and which, during brazing, are inert to members; brazing the members; and then removing the particulate filler material.
Claim 7
Dependent Claim
88 words
In a method for making an article having a hollow interior, a gap communicating with the hollow interior, and a plurality of members brazed across the gap therebetween, each member having an outer surface, the steps of: positioning the plurality of members across the gap; dispersing within the hollow interior at the outer surface a particulate filler material the particles of which generally are greater in size than the gap and which, during brazing, are inert to members; brazing the members; and then removing the particulate filler material.
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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) | 1977-07-29 | 1978-01-28 | 1978-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-29 | 1982-01-28 | 1982-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-29 | 1986-01-28 | 1986-07-30 | $7700.00 | Window Closed / Lapsed |