Patent US4022545A successfully refreshed from Google Patents.
US4022545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rooted aerodynamic blade and elastic roll pin damper construction
Assignee: Avco Corp
•
Filing: 1976-01-28
•
Granted: 1977-05-10
•
Expires: 1996-01-28
Abstract
Abstract Herein disclosed is the combination of an aerodynamic blade having a root formed with outwardly curved shoulders and a transverse curved indentation, a rotor disc formed with a blade root receiving slot having curved complementary retaining surfaces in contact with those shoulders and an elastic split metallic roll pin disposed between the indentation and disc to provide damping, the radii of the curved shoulders and retaining surfaces being generated from an axis below said indentation.
Inventors
- 👤 Wayne C. Shank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:01
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/26; F01D5/30; F01D5/3007
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
111 words
In rotating machinery, the combination of: an aerodynamic blade having a root formed with outwardly curved shoulders and an axially extending lower curved indentation, a rotor disc formed with a transverse blade root receiving slot having curved retaining surfaces in contact with said shoulders, and an elastic split metallic roll pin disposed between said indentaion and disc to provide damping while permitting the blade to tilt, the axis of swinging movement of the blade being below its root and the curved shoulders and complementary retaining surfaces being generated by a radius having such axis as a center, the roll pin assuring contact at low speeds between said shoulders and said surfaces.
Claim 2
Dependent Claim
111 words
In rotating machinery, the combination of: an aerodynamic blade having a root formed with outwardly curved shoulders and an axially extending lower curved indentation, a rotor disc formed with a transverse blade root receiving slot having curved retaining surfaces in contact with said shoulders, and an elastic split metallic roll pin disposed between said indentaion and disc to provide damping while permitting the blade to tilt, the axis of swinging movement of the blade being below its root and the curved shoulders and complementary retaining surfaces being generated by a radius having such axis as a center, the roll pin assuring contact at low speeds between said shoulders and said surfaces.
Claim 3
Dependent Claim
25 words
The combination in accordance with claim 1 in which the rotor disc is formed with a second indentation complementary to that formed in the root.
References Cited (Backward Citations)
US1619133A
Cited
DE632001C
Cited
US2727716A
Cited
US2595829A
Cited
US2686655A
Cited
US2753149A
Cited
US2936155A
Cited
GB753229A
Cited
DE950557C
Cited
US2997274A
Cited
US2847187A
Cited
US3572970A
Cited
DE2117220A1
Cited
DE2108176A1
Cited
US3687569A
Cited
US3720481A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-09 | 1980-11-08 | 1981-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-09 | 1984-11-08 | 1985-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-09 | 1988-11-08 | 1989-05-10 | $7700.00 | Window Closed / Lapsed |