US3899267A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Turbomachinery blade tip cap configuration
Assignee: General Electric Co
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Filing: 1973-04-27
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Granted: 1975-08-12
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Expires: 1993-04-27
Abstract
Abstract An improved tip cap configuration for a turbomachinery blade includes tip cap seats formed integrally with and located on the inner sides of a hollow turbomachinery blade. Tip cap retaining members are also formed integrally with the inner wall of the blade and are spaced a short radial distance from the tip cap seats. The blade is initially provided with a flared open end and the tip caps are positioned on the seats and the flared end is crimped so as to capture the tip cap between the seats and the retaining members. The crimping operation is stopped at a point wherein a smooth outer contour is obtained for the blade in the region of the tip cap. A method of making such a blade is also disclosed.
Inventors
- 👤 Ronald E Dennis
- 👤 William D Treece
- 👤 Robert J Corsmeier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:14
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/14; F01D5/20; B; B23; B23P; B23P15/00; B23P15/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
108 words
In a turbomachinery blade of the type comprising an airfoilshaped, hollow body portion having a pair of side walls defining an internal cavity therebetween, and an airfoil-shaped tip cap defining the outer bounds of said internal cavity, the improvement comprising: each of said side walls includes a tip cap seat formed integrally therewith on the inner side thereof and at least one tip cap retaining member formed integrally therewith on the inner side thereof and radially spaced from said seat so as to be capable of capturing said tip cap between said seats and said retaining members such that said tip cap is mechanically secured to said blade.
Claim 2
Dependent Claim
108 words
In a turbomachinery blade of the type comprising an airfoilshaped, hollow body portion having a pair of side walls defining an internal cavity therebetween, and an airfoil-shaped tip cap defining the outer bounds of said internal cavity, the improvement comprising: each of said side walls includes a tip cap seat formed integrally therewith on the inner side thereof and at least one tip cap retaining member formed integrally therewith on the inner side thereof and radially spaced from said seat so as to be capable of capturing said tip cap between said seats and said retaining members such that said tip cap is mechanically secured to said blade.
Claim 3
Dependent Claim
29 words
The improved turbomachinery blade of claim 1 further characterized in that said hollow body portion has a smooth radially extending outer contour in the region of said tip cap.
Claim 4
Dependent Claim
51 words
The improved turbomachinery blade of claim 1 further characterized in that said tip cap has a generally U-shaped cross section including a bight portion and a pair of leg members and each of said leg members is sized so as to fit between said seat and one of said retaining members.
Claim 5
Dependent Claim
22 words
The improved turbomachinery blade of claim 3 further characterized in that said bight portion is provided with a plurality of coolant holes.
Claim 6
Dependent Claim
22 words
The improved turbomachinery blade of claim 4 further characterized in that said holes are spaced around the circumference of said tip cap.
Claim 7
Dependent Claim
28 words
The improved turbomachinery blade of claim 5 further characterized in that said holes are angled so as to direct coolant toward said retaining members and said side walls.
Claim 8
Dependent Claim
28 words
The improved turbomachinery blade of claim 4 further characterized in that said holes are angled so as to direct coolant toward said retaining members and said side walls.
Claim 9
Dependent Claim
39 words
The improved turbomachinery blade of claim 3 further characterized in thaT said hollow body portion has a smooth outer contour from a point below the region of said tip cap to the outer end of said hollow body portion.
References Cited (Backward Citations)
US2213940A
Cited
US3626568A
Cited
US3761201A
Cited
US3628885A
Cited
US3635587A
Cited
US3732031A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |