US3249159A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Propeller control system
Assignee: Hartzell Propeller Inc
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Filing: 1965-01-06
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Granted: 1966-05-03
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Expires: 1985-01-06
Abstract
No abstract record available.
Inventors
- 👤 Biermann David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:02
CPC Classifications
B; B63; B63H; B63H3/00; B63H3/06; B63H3/08; B63H3/081; B63H3/082; B64; B64C; B64C11/00; B64C11/30; B64C11/38; B64C11/40; B63H2003/088
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
181 words
A VARIABLE PITCH PROPELLER COMPRISING; AN ENGINE DRIVE SHAFT, A BUB MOUNTED ON SAID DRIVE SHAFT, PROPELLER BLADES RADIALLY MOUNTED ON SAID HUB FOR ROTATIONAL MOVEMENT ABOUT THEIR AXES, CENTRIFUGALLY RESPONSIVE COUNTERWEIGHTS ATTACHED TO SAID BLADES TENDING TO ROTATE THEM IN ONE DIRECTION ABOUT THEIR AXES, HYDRAULIC PISTON MEANS MOUNTED ON SAID HUB FOR RELATIVE AXIAL MOVEMENT THEREWITH, LINK MEANS CONNECTING SAID PISTON MEANS WITH SAID BLADES FOR CHANGING THE PITCH THEREOF UPON AXIAL MOVEMENT OF SAID PISTON MEANS IN OPPOSITION TO THE ACTION OF SAID COUNTERWEIGHTS, SPRING MEANS COOPERAING WITH SAID COUNTERWEIGHTS TENDING TO AID THE COUNTERWEIGHTS IN OPPOSITION TO SAID POSITION MEANS A HYDRAULIC RESERVOIR, A PUMP RECEIVING FLUID FROM SAID RESERVOIR AND SUPPLYING THE SAME UNDER PRESSURE TO SAID PISTON MEANS, VALVE MEANS MOUNTED EXTERNALLY OF SAID HUB AND SHAFT AND HAVING AN INLET PORT CONNECTED TO THE DISCHARGE PORT OF SAID PUMP AND HAVING A DISCHARGE PORT CONNECTED TO SAID RESERVOIR, GOVERNOR MEANS REGULATING THE FLOW OF FLUID FROM SAID PUMP TO SAID PISTON MEANS IN SUCH A MANNER AS TO PROVIDE FLOW OF FLUID TO SAID
Claim 2
Dependent Claim
181 words
A VARIABLE PITCH PROPELLER COMPRISING; AN ENGINE DRIVE SHAFT, A BUB MOUNTED ON SAID DRIVE SHAFT, PROPELLER BLADES RADIALLY MOUNTED ON SAID HUB FOR ROTATIONAL MOVEMENT ABOUT THEIR AXES, CENTRIFUGALLY RESPONSIVE COUNTERWEIGHTS ATTACHED TO SAID BLADES TENDING TO ROTATE THEM IN ONE DIRECTION ABOUT THEIR AXES, HYDRAULIC PISTON MEANS MOUNTED ON SAID HUB FOR RELATIVE AXIAL MOVEMENT THEREWITH, LINK MEANS CONNECTING SAID PISTON MEANS WITH SAID BLADES FOR CHANGING THE PITCH THEREOF UPON AXIAL MOVEMENT OF SAID PISTON MEANS IN OPPOSITION TO THE ACTION OF SAID COUNTERWEIGHTS, SPRING MEANS COOPERAING WITH SAID COUNTERWEIGHTS TENDING TO AID THE COUNTERWEIGHTS IN OPPOSITION TO SAID POSITION MEANS A HYDRAULIC RESERVOIR, A PUMP RECEIVING FLUID FROM SAID RESERVOIR AND SUPPLYING THE SAME UNDER PRESSURE TO SAID PISTON MEANS, VALVE MEANS MOUNTED EXTERNALLY OF SAID HUB AND SHAFT AND HAVING AN INLET PORT CONNECTED TO THE DISCHARGE PORT OF SAID PUMP AND HAVING A DISCHARGE PORT CONNECTED TO SAID RESERVOIR, GOVERNOR MEANS REGULATING THE FLOW OF FLUID FROM SAID PUMP TO SAID PISTON MEANS IN SUCH A MANNER AS TO PROVIDE FLOW OF FLUID TO SAID
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) | 1969-05-02 | 1969-11-01 | 1970-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-02 | 1973-11-01 | 1974-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-02 | 1977-11-01 | 1978-05-03 | $7700.00 | Window Closed / Lapsed |