Patent US734307A successfully refreshed from Google Patents.
Patent US3560108A successfully refreshed from Google Patents.
US3560108A
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US
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Safety device for variable pitch propellers
Assignee: KARISTADS MEKANISKA WERKSTAD A
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Filing: 1968-11-29
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Granted: 1971-02-02
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Expires: 1988-11-29
Abstract
Abstract A SAFETY DEVICE FOR VARIABLE PITCH MARINE PROPELLERS COMPRISES, ACCORDING TO A PREFERRED EMBODIMENT OF THE INVENTION, A HUB, PROPELLER BLADES ROTATABLY MOUNTED IN THE HUB FOR ADJUSTMENT OF THEIR PITCH, AND A FLUID MOTOR LOCATED IN THE HUB TO EFFECT SUCH ADJUSTMENT. A SECOND FLUID MOTOR IS NORMALLY INOPERATIVE, BUT, UPON FAILURE OF THE FIRST MOTOR, OPERATES, INDEPENDENT OF THE FIRST MOTOR, TO CHANGE THE PROPELLER PITCH TO ONE PROVIDING FORWARD MOVEMENT OF THE SHIP, REGARDLESS OF THE PITCH THEN ETABLISHED BY THE MAIN PITCH-CONTROL SYSTEM.
Inventors
- 👤 Carl-Axel Lindahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 05:58
CPC Classifications
B; B63; B63H; B63H3/00; B63H3/06; B63H3/08; B63H3/081; B63H3/082; B63H2003/088
Claims Analysis
Total Claims: 0
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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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |