Patent US3574482A successfully refreshed from Google Patents.
US3574482A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Turbomachinery blades
Assignee: General Electric Co
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Filing: 1969-01-23
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Granted: 1971-04-13
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Expires: 1989-01-23
Abstract
Abstract A cast, hollow, turbine blade has an opening in its tip end wall formed by a core pin which positioned the core in a mold as the blade was cast. A plate is brazed to the inner surface of this end wall and seals this opening in a manner such that the structural integrity of the blade is not dependent on a bonded joint.
Inventors
- 👤 Joseph W Savage
- 👤 Henry J Brands
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:31
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/14; F01D5/18; F01D5/187; F01D9/00; F01D9/02; F01D9/04; F01D9/041; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
61 words
A cast, hollow, turbomachinery blade: having an internal chamber defined in part by an integrally cast end wall at the tip end thereof; said end wall having an opening therethrough formed by a supporting core pin during casting of the blade; and a plate bonded to the inner surface of said end wall and overlying said opening to seal said opening.
Claim 2
Dependent Claim
61 words
A cast, hollow, turbomachinery blade: having an internal chamber defined in part by an integrally cast end wall at the tip end thereof; said end wall having an opening therethrough formed by a supporting core pin during casting of the blade; and a plate bonded to the inner surface of said end wall and overlying said opening to seal said opening.
Claim 3
Dependent Claim
69 words
A turbomachinery blade as in claim 1 wherein: the blade further comprises an integrally cast tang at the inner end of the blade; the tang has at least one opening in the form of a port for admitting cooling fluid into said chamber; and the plate is insertable through one of said openings to permit its introduction into said chamber and positioning on said end wall for bonding thereto.
Claim 4
Dependent Claim
41 words
A turbomachinery blade as in claim 2 wherein: a recess is formed on the inner surface of said end wall around the opening therein and the insert is registered therein, said recess facilitating positioning of said plate on said end wall.
Claim 5
Independent Claim
75 words
A method of sealing the internal chamber of a hollow, cast, turbomachinery blade having an end wall defining the outer bounds of the chamber, where said end wall has an opening therethrough, formed by a supporting core pin during casting of the blade, comprising the steps of: introducing a plate into said chamber; positioning said plate on the inner surface to said end wall, overlying said opening; and bonding said plate to said end wall.
Claim 6
Independent Claim
75 words
A method of sealing the internal chamber of a hollow, cast, turbomachinery blade having an end wall defining the outer bounds of the chamber, where said end wall has an opening therethrough, formed by a supporting core pin during casting of the blade, comprising the steps of: introducing a plate into said chamber; positioning said plate on the inner surface to said end wall, overlying said opening; and bonding said plate to said end wall.
Claim 7
Dependent Claim
49 words
A method as in claim 4 comprising the further steps of: introducing a plate having brazing material thereon; subjecting the blade to heat after the plate has been so positioned to melt said braze; and removing said heat to complete the bonding of the plate to the end wall.
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) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |