Patent US3171494A successfully refreshed from Google Patents.
US3171494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Servo mechanism for controllable pitch propellers
Assignee: Individual
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Filing: 1962-10-26
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Granted: 1965-03-02
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Expires: 1982-10-26
Abstract
No abstract record available.
Inventors
- 👤 Liaaen Nils Johannes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:51
CPC Classifications
B; B64; B64C; B64C11/00; B64C11/30; B64C11/38; B64C11/40; B63; B63H; B63H3/00; B63H3/06; B63H3/08; B63H3/081; B63H3/082; B63H2003/084
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
231 words
A CONTROLLABLE PITCH PROPELLER INCLUDING A HOLLOW HUB ROTATABLE ABOUT A PREDETERMNED AXIS, A PLURALITY OF BLADES RESPECTIVELY JOURNALLED IN SAID HUB FOR PITCH CHANGING ADJUSTMENT ABOUT AXES EXTENDING GENERALLY RADIALLY TO SAID ROTATIONAL AXIS, A CRANK DISC POSITIONED ON THE BASE OF EACH OF SAID BLADES AND SECURED THERETO AT RIGHT ANGLES TO THE PITCH CHANGING AXIS OF THE SAID BLADE AND PROVIDED WITH A PAIR OF CRANKS POSITIONED DIAMETRICALLY TO SAID AXIS, A SLIDE MEANS CARRIED BY THE SAID CRANK DISC AND ROTATABLY MOUNTED ON EACH OF THE SAID CRANKS, A CYLINDER MEMBER EXTENDING AXIALLY OF THE SAID HUB AND BEING CLOSED AT THE END REMOTE FROM THE SAID CRANK DISCS AND OPEN AT THE END FACING THE SAID CRANK DISCS, A PISTON MOUNTED FOR SLIDABLE MOVEMENT IN THE SAID CYLINDER MEMBER AND PRESENTING A PLURALITY OF PROJECTIONS EXTENDING AXIALLY OF THE SAID HUB, EACH SUCH PROJECTION BEING IN OPERATIONAL CONNECTION WITH THE SAID SLIDE MEANS OF ONE OF SAID CRANKS ON ONE CRANK DISC, A SECOND PISTON MOUNTED FOR SLIDEABLE MOVEMENT IN THE SAID CYLINDER MEMBER AT THE SIDE OF THE FIRST SAID PISTON REMOTE FROM THE SAID CRANK DISCS, AND A CONNECTING ROD EXTENDING AXIALLY OF THE SAID HUB BETWEEN THE SAID SECOND PISTON AND THE SAID CRANK DISCS AND IN OPERATIONAL CONNECTION WITH THE SAID SLIDE MEANS OF ONE CRANK ON EACH OF THE SAID DISCS.
Claim 2
Dependent Claim
231 words
A CONTROLLABLE PITCH PROPELLER INCLUDING A HOLLOW HUB ROTATABLE ABOUT A PREDETERMNED AXIS, A PLURALITY OF BLADES RESPECTIVELY JOURNALLED IN SAID HUB FOR PITCH CHANGING ADJUSTMENT ABOUT AXES EXTENDING GENERALLY RADIALLY TO SAID ROTATIONAL AXIS, A CRANK DISC POSITIONED ON THE BASE OF EACH OF SAID BLADES AND SECURED THERETO AT RIGHT ANGLES TO THE PITCH CHANGING AXIS OF THE SAID BLADE AND PROVIDED WITH A PAIR OF CRANKS POSITIONED DIAMETRICALLY TO SAID AXIS, A SLIDE MEANS CARRIED BY THE SAID CRANK DISC AND ROTATABLY MOUNTED ON EACH OF THE SAID CRANKS, A CYLINDER MEMBER EXTENDING AXIALLY OF THE SAID HUB AND BEING CLOSED AT THE END REMOTE FROM THE SAID CRANK DISCS AND OPEN AT THE END FACING THE SAID CRANK DISCS, A PISTON MOUNTED FOR SLIDABLE MOVEMENT IN THE SAID CYLINDER MEMBER AND PRESENTING A PLURALITY OF PROJECTIONS EXTENDING AXIALLY OF THE SAID HUB, EACH SUCH PROJECTION BEING IN OPERATIONAL CONNECTION WITH THE SAID SLIDE MEANS OF ONE OF SAID CRANKS ON ONE CRANK DISC, A SECOND PISTON MOUNTED FOR SLIDEABLE MOVEMENT IN THE SAID CYLINDER MEMBER AT THE SIDE OF THE FIRST SAID PISTON REMOTE FROM THE SAID CRANK DISCS, AND A CONNECTING ROD EXTENDING AXIALLY OF THE SAID HUB BETWEEN THE SAID SECOND PISTON AND THE SAID CRANK DISCS AND IN OPERATIONAL CONNECTION WITH THE SAID SLIDE MEANS OF ONE CRANK ON EACH OF THE SAID DISCS.
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) | 1968-03-01 | 1968-08-31 | 1969-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-01 | 1972-08-31 | 1973-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-01 | 1976-08-31 | 1977-03-02 | $7700.00 | Window Closed / Lapsed |