US3746466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjusting and locking device
Assignee: Dieselmotorenwerk VEB
•
Filing: 1971-06-25
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Granted: 1973-07-17
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Expires: 1991-06-25
Abstract
Abstract In combination with a propeller mounted on a shaft and having blades each mounted for rotation about a respective axis transverse to the axis of the shaft to adjust the blade pitch, a yoke mounted for displacement parallel to the axis of the shaft, means operatively connecting the yoke to the blades for converting the displacement of the yoke into rotation of the blades about the respective axes, the yoke being expansibly fitted on the shaft by an hydraulically operable expansion joint, an annular groove being formed at the joint, means forming a chamber at each axial end of the yoke, a pump, conduit means communicating between the pump and the working chambers and the annular groove, and shuttle valve means for opening communication between the pump and either one of the chambers and simultaneously closing communication between the pump and the other of the chambers the application of oil to the groove freeing the yoke for movement as oil is admitted to one or other of said chambers.
Inventors
- 👤 G Dallach
- 👤 A Dudszus
- 👤 L Fretwurst
- 👤 J Granz
- 👤 D Schlottmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:42
CPC Classifications
B; B63; B63H; B63H3/00; B63H3/06; B63H3/08; B63H3/081; B63H3/082; B63H2003/084
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
166 words
In combination with a propeller mounted on a shaft and having blades each mounted for rotation about a respective axis transverse to the axis of the shaft to adjust the blade pitch, a yoke mounted for displacement parallel to the axis of the shaft, means operatively connecting the yoke to the bladEs for converting the displacement of the yoke into rotation of the blades about said respective axes, the yoke being fitted on the shaft by an hydraulically operable expansion joint, an annular groove being formed at the joint, means forming a chamber at each axial end of the yoke, a pump, conduit means communication between the pump and the working chambers and the annular groove, and shuttle valve means for opening communication between the pump and either one of the chambers and simultaneously closing communication between the pump and the other of the chambers whereby the application of fluid pressure to the groove releases said joint for movement of said yoke relative to the shaft.
Claim 2
Dependent Claim
166 words
In combination with a propeller mounted on a shaft and having blades each mounted for rotation about a respective axis transverse to the axis of the shaft to adjust the blade pitch, a yoke mounted for displacement parallel to the axis of the shaft, means operatively connecting the yoke to the bladEs for converting the displacement of the yoke into rotation of the blades about said respective axes, the yoke being fitted on the shaft by an hydraulically operable expansion joint, an annular groove being formed at the joint, means forming a chamber at each axial end of the yoke, a pump, conduit means communication between the pump and the working chambers and the annular groove, and shuttle valve means for opening communication between the pump and either one of the chambers and simultaneously closing communication between the pump and the other of the chambers whereby the application of fluid pressure to the groove releases said joint for movement of said yoke relative to the shaft.
Claim 3
Dependent Claim
79 words
A combination according to claim 1, further comprising respective conduit means communicating between each of the chambers and the groove, a first valve means in the conduit means between one of the chambers and the groove and a second valve means in the conduit means between the other of the chambers and the groove, each of the valve means permitting passage of a fluid away from the respective chamber and preventing passage of a fluid toward the respective chamber.
Claim 4
Dependent Claim
59 words
A combination according to claim 1, further comprising limit switch means defining the limits of said displacement of the yoke in both directions, each of said limit switch means comprising a valve communicating between said conduit means and the exterior of the yoke and means for opening the valve when the yoke reaches a respective one of said limits.
Claim 5
Dependent Claim
46 words
A combination according to claim 1, further comprising check valve means in the conduit means between the shuttle valve means and the chambers for permitting passage of fluid when the pump is operating and for blocking passage of the fluid when the pump is not operating.
Claim 6
Dependent Claim
24 words
A combination according to claim 1, further comprising a hub mounting said blades and in which hub said shaft and said yoke are arranged.
Claim 7
Dependent Claim
22 words
A combination according to claim 1, further comprising gravity drive means drivably connected to the shaft and drivingly connected to the pump.
Claim 8
Dependent Claim
23 words
A combination according to claim 1, further comprising a second pump in communication with said conduit means, the two pumps being independently drivable.
References Cited (Backward Citations)
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US3125960A
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US2355039A
Cited
FR922918A
Cited
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Cited
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Cited
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Cited
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Cited
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Cited
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |