Patent US4767274A successfully refreshed from Google Patents.
US4767274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple lug blade to disk attachment
Assignee: RTX Corp
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Filing: 1986-12-29
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Granted: 1988-08-30
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Expires: 2006-12-29
Abstract
Abstract Structure for retaining rotor blades of a disk and blade assembly of a rotary machine is disclosed. A plurality of blade lugs extend from beneath the platform of each rotor blade into engagement with a corresponding plurality of disk slots. In a preferred form the disk slots are formed to a helical geometry across the periphery of the disk.
Inventors
- 👤 Jerry D. Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:11
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/14; F01D5/147; F01D5/30; F01D5/3007; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
69 words
A rotor assembly comprising: a plurality of rotor blades each having a blade chord line and each having at least three root lugs formed to a helical geometry and disposed along the blade essentially perpendicularly to said chord line; and a rotor disk having at least three parallel slots extending from the front face to the rear face across the periphery of the disk for engaging said root lugs.
Claim 2
Dependent Claim
69 words
A rotor assembly comprising: a plurality of rotor blades each having a blade chord line and each having at least three root lugs formed to a helical geometry and disposed along the blade essentially perpendicularly to said chord line; and a rotor disk having at least three parallel slots extending from the front face to the rear face across the periphery of the disk for engaging said root lugs.
Claim 3
Dependent Claim
22 words
The invention according to claim 1 wherein the angle of advance of the slots is on the order of thirty degrees (30°).
Claim 4
Dependent Claim
20 words
The invention according to claim 1 wherein said slots and blade lugs are configured to an interlocking "dovetail" shaped contour.
Claim 5
Dependent Claim
21 words
The invention according to claim 1 wherein said slots and blade lugs are configured to an interlocking "fir tree" shaped contour.
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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) | 1991-08-30 | 1992-02-29 | 1992-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-30 | 1996-02-29 | 1996-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-30 | 2000-02-29 | 2000-08-30 | $7700.00 | Window Closed / Lapsed |