US3550547A - Auxiliary maneuvering means for ships - Google Patents

Auxiliary maneuvering means for ships Download PDF

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Publication number
US3550547A
US3550547A US760022A US3550547DA US3550547A US 3550547 A US3550547 A US 3550547A US 760022 A US760022 A US 760022A US 3550547D A US3550547D A US 3550547DA US 3550547 A US3550547 A US 3550547A
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propeller
tunnel
auxiliary
center portion
ship
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US760022A
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Friedrich W Pleuger
Wilhelm Bey
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H25/00—Steering; Slowing-down otherwise than by use of propulsive elements; Dynamic anchoring, i.e. positioning vessels by means of main or auxiliary propulsive elements
    • B63H25/46—Steering or dynamic anchoring by jets or by rudders carrying jets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
    • B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
    • B63H5/14—Arrangements on vessels of propulsion elements directly acting on water of propellers characterised by being mounted in non-rotating ducts or rings, e.g. adjustable for steering purpose
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H25/00—Steering; Slowing-down otherwise than by use of propulsive elements; Dynamic anchoring, i.e. positioning vessels by means of main or auxiliary propulsive elements
    • B63H25/46—Steering or dynamic anchoring by jets or by rudders carrying jets
    • B63H2025/465—Jets or thrusters substantially used for steering or dynamic anchoring only, with means for retracting, or otherwise moving to a rest position outside the water flow around the hull

Definitions

  • the centre portion of the tunnel ofthe lateral thrust device together with the propeller arranged therein is located in a recess in the interior ofthe ship.
  • the centre portion ofthe tunnel is constructed as nozzle, which is downwardly extendible and in the extended position turnable around 360.
  • AL'XILIARY MANEUVERING MEANS FOR SHIPS DESCRIPTION lt is known to use extensible propeller devices as well as lateral thrust devices as auxiliary maneuvering means for ships.
  • an extensible slewing propeller can also be used as auxiliary drive for advancing direction of a ship with a sea'damaged main engine device. It is possible to use an extensible slewing propeller provided that a sufficient depth of water is existing, which, especially at district trips, is not always the case. Low water depth, however ⁇ cannot affect a lateral thrust device.
  • the known lateral thrust devices consist of an auxiliary propeller arranged in a tunnel being provided in transverse direction of the vessel. Being mere maneuvering means ⁇ lateral thrust devices can only affect the ship by applying a lateral thrust, they cannot be used as auxiliary drive for the advancing direction of the ship.
  • lt is an important object of the invention to provide an auxiliary maneuvering means being independent from low water levels in port basins and the like.
  • a further object of the present invention is to provide an auxiliary maneuvering means which, in sufficient water depth, can also be used as auxiliary drive for the advancing direction of the ship.
  • Another object of the invention is to provide an auxiliary maneuvering means for ships by combining a lateral thrust device with an extensible slewing propeller.
  • a ship being provided with the auxiliary maneuvering means according to the present invention is no longer forced to retract the slewing propeller device in low water levels and to do without further own help for maneuvering.
  • the center portion of the tunnel of the lateral thrust device comprising the propeller, in a 'nel is retracted, the recess, which is open at the bottom, can be closed by a bottom piece being of streamline shape and adapted to the outer contour of the ship.
  • This bottom piece is attached to the nozzlelike center portion of the tunnel. It is advantageous to construct the bottom piece as a hollow body and to provide it with openings for the passage of water in order to decrease the resistance.
  • a further embodiment of the invention is to arrange the center portion of the tunnel at a pivotable pillar consisting of sea water-resistant material at the upper end of which pillar the driving motor for the propeller is located.
  • the pivotable pillar may be hollow to receive the driving shaft connecting the motor with the propeller.
  • a hydraulic lifting cylinder is used for extending and retracting the propeller situated in the center portion of the tunnel.
  • Two guide posts serve for guiding the slewing means also attached at the upper end of the pivotable pillar and thus for guiding the driving motor, too, being immediately coupled with the slewing means.
  • stopping devices as for instance cams, are provided to arrest the terminal positions of the propellers in the extended or retracted state.
  • a drive motor arranged in the interior of the ship at the upper end of the pivotable pillar.
  • FIG. l represents the arrangement of the invention in the hull of the ship and. drawn in interrupted lines, the center portion of the tunnel in the extended position;
  • FIG. 2 shows. in interrupted lines, the plan view from the front of the extended center part of the tunnel according to FIG. 1.
  • FIG. 3 is a section through a submersible motor directly coupled with an auxiliary propeller.
  • a nozzle-shaped center portion l of a tunnel the propeller 2 is housed, which is driven by the driving motor 3 via a driving shaft not shown and a gear situated in the gear housing 4.
  • the center portion 1 of the tunnel is located in a recess 5 of the hull 6 of the ship.
  • Recess 5 is open at the bottom and by means of a bottom piece 7 is closed from below.
  • end portions 8 of the tunnel are provided being rigidly connected with the hull 6 of the ship.
  • the gear housing 4, by a flanged joint and by lateral supports is connected with the center portion 1 of the tunnel, which forms a unit with the bottom piece 7 placed underneath.
  • the center portion 1 of the tunnel is secured at a strong pivotable pillar 9 consisting of sea waterresistance material.
  • Pivotable pillar 9 receives its guidance from a lower bearing 10 with sealing and in an upper, not shown bearing in a so-called crosshead 1l containing the slew ⁇ ing means for the center portion 1 of the tunnel with propeller 2 in extended position and guided by two guide posts 12.
  • the electric motor 3 provided for the drive of propeller 2 is mounted on crosshead 11. Via an elastic coupling (not shown) is crosshead 11 the electric motor 3 is connected with the driving shaft led through the hollow pivotable pillar 9 and with the pinion shaft of the gear housing 4.
  • the invention In the retracted state the invention is used as lateral thrust device.
  • the electric motor 3 which -can be switched over to another turning direction, via an elastic coupling in crosshead 11 and a driving shaft in the pivotable pillar 9, drives the pinion shaft in the gear housing 4.
  • the pinion of the pinion shaft engages a bevel wheel on the shaft of the propeller. l ⁇ his bevel wheel is not shown.
  • the upper stops are in gear with the terminal cams 14 at crosshead 11 and arrest the center portion of the tunnel in its position.
  • Recess 5 at the bottom is closed by a bottom piece 7.
  • the invention is used as slewing propeller, for which purpose the lifting cylinders 13 are used.
  • the pivotable pillar 9 can be extended downwardly. In the lower position the lower stops get engaged and arrest the center portion of the tunnel in the extended state.
  • the auxiliary maneuvering means can be pivoted without limitation in both turning directions by the slewing device (not shown) arranged in crosshead 11 ⁇
  • the pilot propeller 3 is driven in the same manner as in retracted State.
  • an auxiliaryl maneuvering device comprising means forming a tunnel having a central portion located in a recess inside the ship and constituting a nozzle, a propeller within said central portion a motor driving the propeller, and means lowering said central portion along with the propeller below the ship and turning said central portion in its lowered portion to the extent of 360.
  • auxiliary maneuvering device when the propeller is retracted, the recess being open at the bottom is closed by a streamlined bottom piece which is arranged at the center portion of the tunnel and adapted to the outer contour ofthe ship.
  • auxiliary maneuvering device of claim l wherein the center portion of the tunnel is attached at a pivotable pillar consisting of sea water-resistant material.
  • auxiliary maneuvering device of claim l wherein the driving motor of the propeller is constructed as submersible motor and immediately coupled with the propeller.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Electron Sources, Ion Sources (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)

Description

United States Patent Friedrich W. Pleuger 2 Hamburg 70, 80 Juthornstrasse; Wilhelm Bey, 2 Hamburg 52, 19
F euerbachstrasse, Hamburg, Germany [2l] Appl. No. 760,022
[72] Inventors [22] Filed Sept. 16, 1968 [45] Patented Dec. 29, 1970 [32] Priority June 27, 1968 [33] Germany [3 l] No. 1,756,689
[54] AUXILIARY MANEUVERING MEANS FOR SHIPS 7 Claims, 3 Drawing Figs.
114/151 B63h25/46 114/151, 148,147; 11S/l2 [56] References Cited UNITED STATES PATENTS 2,885,990 5/1959 Hawthrone l l5/35 FOREIGN PATENTS 43,143 5/1960 Poland l 14/151 603,491 4/1960 Italy 114/151 Prnzar)l Examiner-Andrew H. Farrell Attorne \Richards & Geier ABSTRACT: The invention relates to auxiliary maneuvering means for ships which` especially at maneuver voyages, provide an improved maneuvering capability in deep water and which also are applicable when travelling in low waters, wherein a lateral thrust device is combined with a slewing propeller. The centre portion of the tunnel ofthe lateral thrust device together with the propeller arranged therein is located in a recess in the interior ofthe ship. The centre portion ofthe tunnel is constructed as nozzle, which is downwardly extendible and in the extended position turnable around 360.
AL'XILIARY MANEUVERING MEANS FOR SHIPS DESCRIPTION lt is known to use extensible propeller devices as well as lateral thrust devices as auxiliary maneuvering means for ships. In addition to being used as auxiliary maneuvering drive for district trips an extensible slewing propeller can also be used as auxiliary drive for advancing direction of a ship with a sea'damaged main engine device. It is possible to use an extensible slewing propeller provided that a sufficient depth of water is existing, which, especially at district trips, is not always the case. Low water depth, however` cannot affect a lateral thrust device. The known lateral thrust devices consist of an auxiliary propeller arranged in a tunnel being provided in transverse direction of the vessel. Being mere maneuvering means` lateral thrust devices can only affect the ship by applying a lateral thrust, they cannot be used as auxiliary drive for the advancing direction of the ship.
lt is an important object of the invention to provide an auxiliary maneuvering means being independent from low water levels in port basins and the like.
A further object of the present invention is to provide an auxiliary maneuvering means which, in sufficient water depth, can also be used as auxiliary drive for the advancing direction of the ship.
Another object of the invention is to provide an auxiliary maneuvering means for ships by combining a lateral thrust device with an extensible slewing propeller.
A ship being provided with the auxiliary maneuvering means according to the present invention is no longer forced to retract the slewing propeller device in low water levels and to do without further own help for maneuvering.
In an advantageous further embodiment of the present invention. it is proposed to arrange the center portion of the tunnel of the lateral thrust device comprising the propeller, in a 'nel is retracted, the recess, which is open at the bottom, can be closed by a bottom piece being of streamline shape and adapted to the outer contour of the ship. This bottom piece is attached to the nozzlelike center portion of the tunnel. It is advantageous to construct the bottom piece as a hollow body and to provide it with openings for the passage of water in order to decrease the resistance.
A further embodiment of the invention is to arrange the center portion of the tunnel at a pivotable pillar consisting of sea water-resistant material at the upper end of which pillar the driving motor for the propeller is located. The pivotable pillar may be hollow to receive the driving shaft connecting the motor with the propeller. Suitably, a hydraulic lifting cylinder is used for extending and retracting the propeller situated in the center portion of the tunnel. However, there are other possibilities of lifting and lowering the propeller, especially mechanical ones. Two guide posts serve for guiding the slewing means also attached at the upper end of the pivotable pillar and thus for guiding the driving motor, too, being immediately coupled with the slewing means. At the upper and lower end of the guide posts stopping devices, as for instance cams, are provided to arrest the terminal positions of the propellers in the extended or retracted state. In lieu of a drive motor arranged in the interior of the ship at the upper end of the pivotable pillar. it is also possible to couple the propeller immediately with a submersible motor, thus saving the mechanical drive via a long driving shaft.
Besides, because of the very good heat absorption by the surrounding water a submersible motor has the advantage that it can support high stresses.
This invention will be better understood by reference to the following detailed description taken in connection with the accompanying drawings. in which:
FIG. l represents the arrangement of the invention in the hull of the ship and. drawn in interrupted lines, the center portion of the tunnel in the extended position;
FIG. 2 shows. in interrupted lines, the plan view from the front of the extended center part of the tunnel according to FIG. 1.
FIG. 3 is a section through a submersible motor directly coupled with an auxiliary propeller.
In a nozzle-shaped center portion l of a tunnel the propeller 2 is housed, which is driven by the driving motor 3 via a driving shaft not shown and a gear situated in the gear housing 4. In the retracted position of the propeller, the center portion 1 of the tunnel is located in a recess 5 of the hull 6 of the ship. Recess 5 is open at the bottom and by means of a bottom piece 7 is closed from below. At both sides of the center portion 1 of the tunnel arranged in transverse direction of the ship, end portions 8 of the tunnel are provided being rigidly connected with the hull 6 of the ship. The gear housing 4, by a flanged joint and by lateral supports is connected with the center portion 1 of the tunnel, which forms a unit with the bottom piece 7 placed underneath. The center portion 1 of the tunnel is secured at a strong pivotable pillar 9 consisting of sea waterresistance material. Pivotable pillar 9 receives its guidance from a lower bearing 10 with sealing and in an upper, not shown bearing in a so-called crosshead 1l containing the slew` ing means for the center portion 1 of the tunnel with propeller 2 in extended position and guided by two guide posts 12. The electric motor 3 provided for the drive of propeller 2 is mounted on crosshead 11. Via an elastic coupling (not shown) is crosshead 11 the electric motor 3 is connected with the driving shaft led through the hollow pivotable pillar 9 and with the pinion shaft of the gear housing 4. By means of two hydraulic lifting cylinders 13 laterally attached at crosshead 11 the center portion 1 of the tunnel with propeller 2 can be extended and retracted. The upper and lower terminal position of crosshead 11 is arrested by hydraulic stops, which are pushed into so-called guide cams 14 at crosshead 11. Openings 15 in the hollow bottom piece 7 permit the passage of the flowing water and thus decrease the resistance of the center portion 1 of the tunnel in its extended position.
In the retracted state the invention is used as lateral thrust device. The electric motor 3 which -can be switched over to another turning direction, via an elastic coupling in crosshead 11 and a driving shaft in the pivotable pillar 9, drives the pinion shaft in the gear housing 4. The pinion of the pinion shaft engages a bevel wheel on the shaft of the propeller. l`his bevel wheel is not shown. In this operating position the hydraulic for the lifting movement is out of action. The upper stops are in gear with the terminal cams 14 at crosshead 11 and arrest the center portion of the tunnel in its position.
Recess 5 at the bottom is closed by a bottom piece 7. After the center portion l of the tunnel has been extended, the invention is used as slewing propeller, for which purpose the lifting cylinders 13 are used. After the upper stop has been released, the pivotable pillar 9 can be extended downwardly. In the lower position the lower stops get engaged and arrest the center portion of the tunnel in the extended state. As soon as the auxiliary maneuvering means is extended, it can be pivoted without limitation in both turning directions by the slewing device (not shown) arranged in crosshead 11` The pilot propeller 3 is driven in the same manner as in retracted State.
departing from the scope thereof as defined in the appended claims.
We claim:
l. ln a ship, an auxiliaryl maneuvering device comprising means forming a tunnel having a central portion located in a recess inside the ship and constituting a nozzle, a propeller within said central portion a motor driving the propeller, and means lowering said central portion along with the propeller below the ship and turning said central portion in its lowered portion to the extent of 360.
2. The auxiliary maneuvering device according to claim 1, wherein, when the propeller is retracted, the recess being open at the bottom is closed by a streamlined bottom piece which is arranged at the center portion of the tunnel and adapted to the outer contour ofthe ship.
3. The auxiliary maneuvering device as claimed in claim 2, wherein the bottom piece is constructed as a hollow body and provided with openings for the passage of water in order to decrease the resistance.
4. The auxiliary maneuvering device of claim l, wherein the center portion of the tunnel is attached at a pivotable pillar consisting of sea water-resistant material.
5. The auxiliary maneuvering device according to claim 4, wherein the propeller and the driving motor for the propeller are arranged at the upper end ofthe pivotable pillar.
6. The auxiliary maneuvering device according to claim 5` wherein the pivotable pillar is hollow and contains the driving shaft connecting the motor with the propeller.
7. The auxiliary maneuvering device of claim l, wherein the driving motor of the propeller is constructed as submersible motor and immediately coupled with the propeller.
US760022A 1968-06-27 1968-09-16 Auxiliary maneuvering means for ships Expired - Lifetime US3550547A (en)

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Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4075971A (en) * 1976-04-22 1978-02-28 Alsthom-Atlantique S.A. Motor housing for a retractable propulsion unit for boats
US4281615A (en) * 1977-10-31 1981-08-04 Sedco, Inc. Self-propelled semi-submersible service vessel
US4294186A (en) * 1980-01-25 1981-10-13 Wardell Gerald S Retractable bow thruster
US4471708A (en) * 1977-10-31 1984-09-18 Sedco, Inc. Self-propelled semi-submersible service vessel
US5476401A (en) * 1994-09-30 1995-12-19 The United States Of America As Represented By The Secretary Of The Navy Compact water jet propulsion system for a marine vehicle
US5522335A (en) * 1995-01-30 1996-06-04 Westinghouse Electric Corporation Combined azimuthing and tunnel auxillary thruster powered by integral and canned electric motor and marine vessel powered thereby
WO1998030440A1 (en) * 1997-01-09 1998-07-16 Ulstein Propeller As Steering and/or propulsion device for a vessel
US6009822A (en) * 1999-03-29 2000-01-04 Aron; Douglas A. Bow or stern thruster
WO2006128486A1 (en) 2005-06-02 2006-12-07 Schiffko Gmbh Forschung Und Entwicklung Maritimer Systeme Auxiliary drive device for ships
US20070289516A1 (en) * 2004-04-19 2007-12-20 Lars-Goran Andersson Method And Auxiliary Device For Disassembly/Assembly Of A Tunnel Thruster
US7641526B1 (en) * 2008-09-09 2010-01-05 Thrustmaster of Texas, Inc. Vessel and underwater mountable azimuthing thruster
US20100175603A1 (en) * 2007-07-25 2010-07-15 Samsung Heavy Ind. Co., Ltd. Icebreaking additional propulsion system and icebreaking ship having the same
US20110073029A1 (en) * 2009-09-30 2011-03-31 Zf Friedrichshafen Ag Tunnel thruster for vessels
WO2012089914A1 (en) 2010-12-30 2012-07-05 Wärtsilä Finland Oy A retractable thruster unit for a marine vessel
US8453963B2 (en) 2009-03-04 2013-06-04 Shiying Liu Amphibious large aircraft without airstairs
US20150139803A1 (en) * 2012-05-02 2015-05-21 Schottel Gmbh Electrically driven, retractable rudder propeller including a step-down gear unit
US20160101839A1 (en) * 2013-04-26 2016-04-14 Fincantieri S.P.A. Retractable thruster
WO2018108232A1 (en) 2016-12-12 2018-06-21 Wärtsilä Netherlands B.V. A lifting spindle arrangement for a retractable thruster unit of a marine vessel
US10162352B2 (en) 2013-05-13 2018-12-25 The Boeing Company Remotely operated mobile stand-off measurement and inspection system
US10167069B2 (en) * 2015-03-18 2019-01-01 Sideshift Inc. Mounting and actuation device
EP4227210A1 (en) 2022-02-11 2023-08-16 Kongsberg Maritime Finland Oy A flow guide arrangement of a rectracable thruster, a rectracable thruster, and a system

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2606593C3 (en) * 1976-02-19 1983-12-01 Ebert, Heinz, Dipl.-Ing., 6903 Neckargemünd Thrusters for watercraft
DE3042210A1 (en) * 1980-11-08 1982-05-27 Hans Ing.(grad.) 6551 Hargesheim Sybertz Bow thruster for manoeuvring ship - has propeller with overhung hub enclosing hydraulic motor supplied via hollow vane in guide vane
US4516940A (en) * 1981-05-19 1985-05-14 Roberts Ernest F Propulsion unit for a water-borne vessel
DE4405931A1 (en) * 1994-02-24 1995-08-31 Nord Systemtechnik Bow rudder for water vessels

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4075971A (en) * 1976-04-22 1978-02-28 Alsthom-Atlantique S.A. Motor housing for a retractable propulsion unit for boats
US4281615A (en) * 1977-10-31 1981-08-04 Sedco, Inc. Self-propelled semi-submersible service vessel
US4471708A (en) * 1977-10-31 1984-09-18 Sedco, Inc. Self-propelled semi-submersible service vessel
US4294186A (en) * 1980-01-25 1981-10-13 Wardell Gerald S Retractable bow thruster
US5476401A (en) * 1994-09-30 1995-12-19 The United States Of America As Represented By The Secretary Of The Navy Compact water jet propulsion system for a marine vehicle
US5522335A (en) * 1995-01-30 1996-06-04 Westinghouse Electric Corporation Combined azimuthing and tunnel auxillary thruster powered by integral and canned electric motor and marine vessel powered thereby
WO1998030440A1 (en) * 1997-01-09 1998-07-16 Ulstein Propeller As Steering and/or propulsion device for a vessel
US6009822A (en) * 1999-03-29 2000-01-04 Aron; Douglas A. Bow or stern thruster
AU2005233057B2 (en) * 2004-04-19 2010-08-12 Kongsberg Maritime Sweden Ab Method and auxiliary device for disassembly/assembly of a tunnel thruster
AU2005233057C1 (en) * 2004-04-19 2011-03-31 Kongsberg Maritime Sweden Ab Method and auxiliary device for disassembly/assembly of a tunnel thruster
US20070289516A1 (en) * 2004-04-19 2007-12-20 Lars-Goran Andersson Method And Auxiliary Device For Disassembly/Assembly Of A Tunnel Thruster
US7549903B2 (en) * 2004-04-19 2009-06-23 Rolls-Royce Aktiebolag Method and auxiliary device for disassembly/assembly of a tunnel thruster
WO2006128486A1 (en) 2005-06-02 2006-12-07 Schiffko Gmbh Forschung Und Entwicklung Maritimer Systeme Auxiliary drive device for ships
US20100175603A1 (en) * 2007-07-25 2010-07-15 Samsung Heavy Ind. Co., Ltd. Icebreaking additional propulsion system and icebreaking ship having the same
US7641526B1 (en) * 2008-09-09 2010-01-05 Thrustmaster of Texas, Inc. Vessel and underwater mountable azimuthing thruster
US8453963B2 (en) 2009-03-04 2013-06-04 Shiying Liu Amphibious large aircraft without airstairs
US20110073029A1 (en) * 2009-09-30 2011-03-31 Zf Friedrichshafen Ag Tunnel thruster for vessels
US8584609B2 (en) * 2009-09-30 2013-11-19 Zf Friedrichshafen Ag Tapered tunnel for tunnel thrusters
WO2012089914A1 (en) 2010-12-30 2012-07-05 Wärtsilä Finland Oy A retractable thruster unit for a marine vessel
US9266595B2 (en) 2010-12-30 2016-02-23 Wärtsilä Finland Oy Retractable thruster unit for a marine vessel
US20150139803A1 (en) * 2012-05-02 2015-05-21 Schottel Gmbh Electrically driven, retractable rudder propeller including a step-down gear unit
US20160101839A1 (en) * 2013-04-26 2016-04-14 Fincantieri S.P.A. Retractable thruster
US9623942B2 (en) * 2013-04-26 2017-04-18 Fincantieri S.P.A. Retractable thruster
US10162352B2 (en) 2013-05-13 2018-12-25 The Boeing Company Remotely operated mobile stand-off measurement and inspection system
US10167069B2 (en) * 2015-03-18 2019-01-01 Sideshift Inc. Mounting and actuation device
WO2018108232A1 (en) 2016-12-12 2018-06-21 Wärtsilä Netherlands B.V. A lifting spindle arrangement for a retractable thruster unit of a marine vessel
US11427292B2 (en) 2016-12-12 2022-08-30 Wartsila Netherlands B.V. Lifting spindle arrangement for a retractable thruster unit of a marine vessel
EP4227210A1 (en) 2022-02-11 2023-08-16 Kongsberg Maritime Finland Oy A flow guide arrangement of a rectracable thruster, a rectracable thruster, and a system

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FR1580093A (en) 1969-08-29
DE1756689A1 (en) 1970-07-23
GB1226398A (en) 1971-03-24

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