US3111172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotor head
Assignee: Lord Manufacturing Co
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Filing: 1962-06-21
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Granted: 1963-11-19
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Expires: 1982-06-21
Abstract
No abstract record available.
Inventors
- 👤 John H Gorndt
- 👤 Robert R Peterson
- 👤 Warren E Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:34
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/35; Y; Y10; Y10T; Y10T403/00; Y10T403/45; Y10T403/455
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
177 words
IN A ROTOR HEAD HAVING A DRIVE ARM, A YOKE HAVING A SHANK EXTENDING RADIALLY OUTWARD FOR CONNECTION TO THE INNER END OF A RADIALLY EXTENDING BLADE, ELASTOMERIC JOINT MEANS BETWEEN THE YOKE AND THE ARM WHICH HAS ITS AXIS OF GREATEST STIFFNESS IN A RADIAL DIRECTION ALONG THE AXIS OF THE BLADE AND WHICH IS SOFT IN TORSION ABOUT THE AXIS OF THE BLADE AND LESS SOFT IN TORSION ABOUT AXES PERPENDICULAR TO THE AXIS OF THE BLADE, ANOTHER ELASTOMERIC JOINT MEANS BETWEEN THE YOKE AND THE ARM SPACED RADIALLY INWARD FROM THE FIRST JOINT MEANS, SAID OTHER JOINT MEANS HAVING ITS GREATEST STIFFNESS IN DIRECTIONS RADIAL TO THE AXIS OF THE BLADE AND BEING SOFT IN TORSION ABOUT THE AXIS OF THE BLADE WHEREBY THE JOINTS RESIST BODILY MOVEMENT OF THE BLADE BOTH ALONG AND TRANSVERSE TO THE AXIS OF THE BLADE WITHOUT INTERFERING WITH ANGULAR MOVEMENT OF THE BLADE ABOUT ITS AXIS FOR VARYING THE PITCH OR ANGULAR MOVEMENT OF THE BLADE ABOUT AXES PERPENDICULAR TO THE AXIS OF THE BLADE FOR LEAD-LAG MOTION.
Claim 2
Dependent Claim
177 words
IN A ROTOR HEAD HAVING A DRIVE ARM, A YOKE HAVING A SHANK EXTENDING RADIALLY OUTWARD FOR CONNECTION TO THE INNER END OF A RADIALLY EXTENDING BLADE, ELASTOMERIC JOINT MEANS BETWEEN THE YOKE AND THE ARM WHICH HAS ITS AXIS OF GREATEST STIFFNESS IN A RADIAL DIRECTION ALONG THE AXIS OF THE BLADE AND WHICH IS SOFT IN TORSION ABOUT THE AXIS OF THE BLADE AND LESS SOFT IN TORSION ABOUT AXES PERPENDICULAR TO THE AXIS OF THE BLADE, ANOTHER ELASTOMERIC JOINT MEANS BETWEEN THE YOKE AND THE ARM SPACED RADIALLY INWARD FROM THE FIRST JOINT MEANS, SAID OTHER JOINT MEANS HAVING ITS GREATEST STIFFNESS IN DIRECTIONS RADIAL TO THE AXIS OF THE BLADE AND BEING SOFT IN TORSION ABOUT THE AXIS OF THE BLADE WHEREBY THE JOINTS RESIST BODILY MOVEMENT OF THE BLADE BOTH ALONG AND TRANSVERSE TO THE AXIS OF THE BLADE WITHOUT INTERFERING WITH ANGULAR MOVEMENT OF THE BLADE ABOUT ITS AXIS FOR VARYING THE PITCH OR ANGULAR MOVEMENT OF THE BLADE ABOUT AXES PERPENDICULAR TO THE AXIS OF THE BLADE FOR LEAD-LAG MOTION.
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) | 1966-11-18 | 1967-05-20 | 1967-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-11-18 | 1971-05-20 | 1971-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-11-18 | 1975-05-20 | 1975-11-19 | $7700.00 | Window Closed / Lapsed |