Patent US3187818A successfully refreshed from Google Patents.
US3187818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blade folding mechanism
Assignee: Boeing Co
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Filing: 1964-12-31
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Granted: 1965-06-08
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Expires: 1984-12-31
Abstract
No abstract record available.
Inventors
- 👤 Lawrence D Barrett
- 👤 Norman E Merrell
- 👤 Victor S Mosinskis
- 👤 Ruttkay Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:54
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/46; B64C27/473; B64C27/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
IN A ROTARY WIND AIRCRAFT HAVING A LEAD-LAG PIVOT, ROTOR BLADE MEANS MOVABLE ABOUT SAID LEAD-LAG PIVOT, MEANS TO CONTROL LEAD-LEG MOVEMENTS OF SAID ROTOR BLADE MEANS ABOUT SAID LEAD-LAG PIVOT, THE IMPROVEMENT COMPRISING A MECHANISM FOR FOLDING AND UNFOLDING SAID ROTOR BLADE MEANS ABOUT SAID LEAD-LAG PIVOT, SAID MECHANISM INCLUDING MEANS TO MOVE SAID ROTOR BLADE MEANS ABOUT SAID LEAD-LAG PIVOT FROM ITS UNFOLDED POSITION TO ITS FOLDED POSITION AND MEANS TO INACTIVE SAID LEAD-LAG CONTROL MEANS DURING MOVEMENT OF SAID ROTOR BLADE MEANS TO ITS FOLDED POSITION WHEREBY UNDESIRED LEAD-LEG MOVEMENTS OF SAID ROTOR BLADE MEANS ARE ELIMINATED DURING THE FOLDING OF SAID ROTOR BLADE MEANS AND ITS FOLDED POSITION IS ACCURATELY PREDETERMINED.
Claim 2
Dependent Claim
115 words
IN A ROTARY WIND AIRCRAFT HAVING A LEAD-LAG PIVOT, ROTOR BLADE MEANS MOVABLE ABOUT SAID LEAD-LAG PIVOT, MEANS TO CONTROL LEAD-LEG MOVEMENTS OF SAID ROTOR BLADE MEANS ABOUT SAID LEAD-LAG PIVOT, THE IMPROVEMENT COMPRISING A MECHANISM FOR FOLDING AND UNFOLDING SAID ROTOR BLADE MEANS ABOUT SAID LEAD-LAG PIVOT, SAID MECHANISM INCLUDING MEANS TO MOVE SAID ROTOR BLADE MEANS ABOUT SAID LEAD-LAG PIVOT FROM ITS UNFOLDED POSITION TO ITS FOLDED POSITION AND MEANS TO INACTIVE SAID LEAD-LAG CONTROL MEANS DURING MOVEMENT OF SAID ROTOR BLADE MEANS TO ITS FOLDED POSITION WHEREBY UNDESIRED LEAD-LEG MOVEMENTS OF SAID ROTOR BLADE MEANS ARE ELIMINATED DURING THE FOLDING OF SAID ROTOR BLADE MEANS AND ITS FOLDED POSITION IS ACCURATELY PREDETERMINED.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-06-07 | 1968-12-07 | 1969-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-07 | 1972-12-07 | 1973-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-07 | 1976-12-07 | 1977-06-08 | $7700.00 | Window Closed / Lapsed |