WO2018166657A1 - Mécanisme d'entraînement pour bossoirs pivotants - Google Patents

Mécanisme d'entraînement pour bossoirs pivotants Download PDF

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Publication number
WO2018166657A1
WO2018166657A1 PCT/EP2018/000131 EP2018000131W WO2018166657A1 WO 2018166657 A1 WO2018166657 A1 WO 2018166657A1 EP 2018000131 W EP2018000131 W EP 2018000131W WO 2018166657 A1 WO2018166657 A1 WO 2018166657A1
Authority
WO
WIPO (PCT)
Prior art keywords
gear
drive mechanism
rack
davits
pinion
Prior art date
Application number
PCT/EP2018/000131
Other languages
English (en)
Inventor
Ørjan TVEIT
Original Assignee
Heron Davits As
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Heron Davits As filed Critical Heron Davits As
Publication of WO2018166657A1 publication Critical patent/WO2018166657A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B23/00—Equipment for handling lifeboats or the like
    • B63B23/02—Davits, i.e. devices having arms for lowering boats by cables or the like
    • B63B23/04—Davits, i.e. devices having arms for lowering boats by cables or the like with arms pivoting on substantially horizontal axes, e.g. gravity type
    • B63B23/06—Davits, i.e. devices having arms for lowering boats by cables or the like with arms pivoting on substantially horizontal axes, e.g. gravity type with actual pivots

Definitions

  • the present invention relates to a drive mechanism for pivoting davits installed upon ships, oil rigs and similar launching sites.
  • the document US6357380 describes a rescue hoist for storing, launching and retrieving a rescue boat having an A-shaped lifting arm supporting- the rescue boat in a stowed position and rotating approximately 20° about the base of the A-shaped frame to assist in hoisting and lowering the rescue boat.
  • a sheave assembly and a hoist stop assembly are mounted upon the apex of the A-shaped frame lifting arm and accommodate a winch line at the apex of the A-shaped frame.
  • An electrical winch raises and lowers the rescue boat, by means of a cable, and a stop ring on said cable operates in conjunction with the hoist stop fitting to cause the cable to rotate the A-shaped frame lifting arm forwards.
  • a post assembly mounted outboard of the ship provides a support for the electrical winch and supports the A-shaped structure lifting arm. It presents the disadvantage that the rescue boat is at all times suspended outboard by virtue of the fact that the post assembly does not retract inboard with the limited movement of 20 degrees of the lifting arm around the base thereof. Nor does it present a suitable form for housing the rescue boat in an inboard position.
  • US6626126 describes a hoisting device suspended over an associated boat comprising suspended and telescopically displaceable horizontal hoist arms to move the boat from a position of inboard stowage to a position of outboard launching, and vice versa, whilst a raising device may move the boat vertically, wherein the raising device is fixed to the hoist arms and the vertical and horizontal movements may be realised independently, in a controlled manner. It is complex by virtue of the fact that it requires suspending the hoist arms and, consequently, an upper strong structure, such as a deck or beams having large projections.
  • US6955519 describes a hoisting system including an elongate base having a rectilinear part and a leading part downwardly inclinable in relation to the rectilinear part.
  • a cradle transporting the boat from an interior withdrawn position to an interior position and, in order that it may be that of introduction into the water, said inclinable leading part must attain the water. It presents the disadvantage that it would not be utilisable when the height whereat the boat is stowed is very great, being the normal situation in large ships wherein the deck may be at dozens of metres above the level of the water.
  • US2009050046 divulges an assembly of hoists for launching a boat from a ship comprising two separate hoists, each whereof includes a substantially horizontal arm, a hoisting cable extending downwards from a suspension frame upon the boom and includes at least one fixing device at the end thereof, such that the hoists move between an inward position wherein the suspension frames extend inward and an outward position, wherein the suspension frames extend outboard rotating in a horizontal plane around the (vertical) axes of each of the hoists, and wherein the suspension frames are movable along the arms such that a distance between said suspension frames remains constant during the rotation of the arms between the two positions when the boat is moved from a parked position to the launching position. It presents the disadvantage that it requires a coordination of movements between both hoists.
  • pivoting hoists or davits comprising a frame provided with one or more upper arms (for suspension, raising or launching the boat) supported by the corresponding columns which, in turn, comprise a supporting base or soleplate upon a fixed part of the ship, usually the deck thereof, the base being joined to said fixed part of the ship by means of an anterior horizontal articulation substantially parallel to the side the ship such that, on the frame pivoting about said articulation between two extreme positions, the boat is parked inboard or alternatively hung outboard to then lower it by means of cables of those hanging from the upper arms.
  • the patent document US2647269 shows a possible embodiment of this variant, wherein the articulation is complex and wherein the pivoting of the hoist is realised by means of ropes or cables joined to the hoist and which are also utilised for launching the boat.
  • the davit is operated by gravity and controlled by cables (the same cable for raising and lowering the boat and for moving it out to the lowering position).
  • the ropes or cables are exposed to the action of corrosion and require constant inspection and maintenance and may fail at the moment of launching.
  • the utilisation of hydraulic cylinders is selected.
  • US3924710 relates to a rack and pinion hoist focused upon worksite hoists to raise and lower a cage and disposing of a rack and pinion safety braking mechanism in the case of overspeed. It describes the corresponding reduction gearbox and the motor being supported upon the driveshaft, they being permitted to float in relation to the cage such that the gearbox is not obliged to support any lateral load upon the pinion, and the bearings within the gearbox solely require to support the weight of the gearbox itself, this permitting a limited movement of the motor with respect to the cage to absorb and reduce the shocks when the motor starts and stops. It only permits linear movements of the cage, with a fixed rack.
  • the document US6023989 describes a transmission device for converting a torque from a rotary movement to a linear movement including a rack having a plurality of teeth and a pinion having rollers meshing with the teeth of the rack, with pressure provided therebetween.
  • the rack has an arcuate tooth flank diametrically greater than each of the rollers of the pinion.
  • the rack also has a tooth face having an approach profile progressively moving away from the path of contact of each of the rollers along which each of the rollers would otherwise engage with the tooth face.
  • a plurality of each of the rollers of the pinion simultaneously mesh with the corresponding teeth of the rack.
  • Another embodiment converts a torque between rotary and linear movement and comprises a pinion having a plurality of teeth and a rack having a plurality of rollers to mesh with the teeth of the pinion.
  • the device achieves reduced transmission resistance, a silent intermeshing movement with no substantial noise and vibration, together with a reduced wear on the teeth and rollers. Similarly it only provides for a linear movement.
  • the document EP2390220 describes a lift having a mobile car within a void, a rack extending along the void, the rack having a toothed profile with wave troughs and wave crests and a drive to the rack such that the drive interacts with the rack to move the cabin.
  • the drive includes a roller pinion unit fixedly mounted upon a shaft and having a predetermined number of roller pinions disposed in a circle around the shaft and extending parallel to the shaft.
  • the roller pinion unit interacts with the toothed profile of the rack.
  • the drive furthermore includes a motor unit configured to rotate the shaft.
  • the drive includes a brake unit configured to act upon the shaft.
  • the rack is disposed in fixed positions, by virtue whereof it may only realise linear movements without rotation. Consequently, they are not appropriate for realising movements of raising and lowering.
  • the drive mechanism for pivoting davits of the invention is applied to davits of the pivoting type, comprising a frame provided with one or more upper arms of suspension of a boat (whether lifeboats or auxiliary boats) or of a fender type protection supported by the corresponding columns, they in turn comprising a supporting base or soleplate upon a fixed part of installation the davit, the base being joined to said fixed part by means of an anterior horizontal articulation substantially parallel to the edge of said fixed part with the water (the side of the ship for example) to pivot the frame from a parked position of the boat inboard of the edge to another launching position outboard of the edge and, in accordance with the invention, it comprises: - at least a gear-rack assembly interposed between at least one of the columns of the frame and the fixed part of installation of the davit, wherein the rack comprises a single point of fixation to said fixed part disposed at one of the extremities thereof, and means of driving the gear (normally at least a motor or crank).
  • the force is applied at the most appropriate point such as to considerably reduce the power of the drive, permitting fixing the movement of the rack at a single extreme point to adapt to the curving movement of pivoting of the frame, thus permitting the implementation of a purely electromechanical drive in a davit, without the disadvantages of the utilisation of hydraulic cylinders, on considerably reducing the power requirements.
  • the zone will be selected disposed at a sufficient distance from the horizontal articulation and from the point of fixation of the rack to the fixed part of installation of the davit such as to achieve the minimum operating power necessary, normally being that wherein the travel of the rack along the gear is greatest, depending on the particular design of the frame in each case.
  • the gear-rack assembly In a position of the frame corresponding to a parked position of the boat, the gear-rack assembly can be disposed substantially completely within the interior of the frame. In a position of the frame corresponding to a launching of the boat, the gear-rack assembly can be disposed at least partially within the interior of the frame. In particular, in a position of the frame corresponding to a launching of the boat, the gear and the means of driving the gear can be disposed substantially completely within the interior of the frame and the rack can be disposed at least partially within the interior of the frame.
  • the deck of a vessel or ship or part of the structure of an oil rig or location or fixed structure adjacent to the water whereat the davit is installed.
  • Figure 1 shows lateral views of the davit in parked or inner position of the boat and in launching or outer position, in a first variant of the invention.
  • Figure 2 shows a detail of the gear-rack assembly in said first variant, wherein the gear comprises a first pinion and the rack a rigid toothed track.
  • Figure 3 shows a magnified detail of the connection between the first pinion and the rigid toothed track.
  • Figure 4 shows a side view of a davit in launching position in a second variant of the invention, wherein the gear-rack assembly comprises a pinion and the rack comprises an open chain or belt mounted upon a rigid rectilinear bar.
  • Figure 5 shows a detail of an assembly formed by a first pinion and rigid toothed track whereupon are disposed two tracks in parallel.
  • Figure 6 shows a detail of a gear-rack assembly having a pinion and a rectilinear drive chain mounted upon a rigid rectilinear bar.
  • Figure 7 shows a detail of a gear-rack assembly having a pinion and a toothed belt mounted upon a rigid rectilinear bar.
  • Figure 8 shows a rear elevation view of a davit in a variant wherein the frame comprises two upper arms.
  • the drive mechanism (1 ) for pivoting davits (100) of the invention (see fig. 1 ) is applied to davits (100) of the type comprising a frame (2) provided with one or more upper arms (3) of suspension of a boat (4) supported by the corresponding columns (14), they in turn comprising a supporting base or soleplate (18) upon a fixed part (6) of installation of the davit (100) (the deck of a ship, for example), the base (18) being joined to said fixed part (6) by means of an anterior horizontal articulation (5) substantially parallel to the edge (7) of said fixed part with the water (the side of the ship in this example) to pivot the frame (2) from a parked position of the boat (4) inboard of the edge (7) to another position of launching outboard of the edge (7) and, according to the invention, it comprises: at least one gear (11)-rack (12) assembly (10) interposed between at least one of the columns (14) of the frame (2) and the fixed part (6) of installation of the
  • the means of driving the gear (11 ) comprise very preferentially at least a motor (16), although they may be others, for example cranks.
  • the gear (11 )-rack (12) assembly (10) is ideally located within the interior of the frame (2) this, for this purpose, being suitably hollow. This protects the assembly (10) from the elements and from spray, and especially the motor (16) of the gear (11 ). Furthermore, it additionally cooperates in producing a clear deck or fixed part (6) in the zone or fixed part of installation of the davit (100).
  • the gear (1 1 )-rack (12) assemblies (10) may comprise one or more tracks (14) (double or triple) in parallel to distribute stresses.
  • a double helicoidal gear (1 1) (having two tracks (14) having the teeth in V-form) and the double rack (12) thereof.
  • the gear (11) is fixed to the frame (2) and the rack (12) is fixed to the fixed part (6) of installation of the davit (100) (as may be observed in the variants in figures 1 and 4), by virtue of the fact that in this manner the most complex part of the mechanism may be held upon the frame (2), the deck being clear in all situations.
  • these elements should these elements be within the interior of the frame (2) they are more protected.
  • a very preferential first variant of the invention shown in figures 1 to 3 provides that the gear (1 1 ) comprises at least a first pinion (11 a), and the rack (12) comprises at least a rigid toothed track (12a).
  • This configuration prevents possible entanglements or elongations which may occur in other chain or belt variants and has very reduced maintenance, in addition to being the most economical.
  • the single point of fixation (15) of the rigid toothed track (12a) to the deck or fixed part (6) of installation of the davit (100) comprises an end hinge permitting the rotation of the track (12a) to adapt to the movement of lowering.
  • the first pinion (1 1 a) may be of teeth or of rollers, the track (12a) being prepared for each case (it may correspondingly be of teeth of rollers).
  • the gear (1 1) comprises at least a pinion (11 b) and the rack (12) comprises an open chain or belt (12b) mounted upon a rigid rectilinear bar (120), the sole point of fixation (15) being an end hinge disposed upon the bar (120).
  • the sole point of fixation (15) being an end hinge disposed upon the bar (120).
  • fig. 6 there may be observed a detail of the open chain or belt (12b) upon the bar (120) and of the pinion (11 b) connected to the same.
  • the open chain or belt (12b) may comprise either a rectilinear drive chain comprising the pinion (11 b), a pinion of radial teeth, or a toothed belt, the pinion (1 1 b) comprising a toothed pulley.
  • the invention has provided for the disposal of several gear (11 )- rack (12) assemblies (10) (see fig. 8) disposed upon the column (14) or columns of a large frame (2) necessary to carry a large boat (4), comprising at least an element of synchronisation between said assemblies (10) to prevent the launching or raising taking place in an uneven manner.
  • Said elements of synchronisation may be, for example, synchronising drives (30) (for example, a shaft synchronising the pinions of the assemblies (10)) and/or an electromagnetic synchronisation (encoders (31) upon each gear (1 1 ) or travel sensors) and logic unit, not shown, coordinated with the supply of the corresponding motors (16). All the elements described may be rendered by means of any type of material and the most appropriate material will be selected in each case.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Transmission Devices (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Supports For Plants (AREA)

Abstract

L'invention concerne un mécanisme d'entraînement (1) pour faire pivoter des bossoirs (100), du type de bossoirs (100) comprenant un bâti (2) pourvu d'un ou de plusieurs bras supérieurs (3) de suspension d'un bateau (4) supporté par des colonnes (14) comprenant une base de support (18) dans une partie fixe (6) d'installation du bossoir (100), la base (18) étant reliée à ladite partie fixe (6) au moyen d'une articulation horizontale antérieure (5) sensiblement parallèle au bord (7) de la partie fixe (6) de manière à faire pivoter le bâti (2) d'une position de stationnement à une autre position de lancement, comprenant : au moins un ensemble engrenage (11)-crémaillère (12) interposé entre au moins l'une des colonnes (14) du bâti (2) et la partie fixe (6), la crémaillère (12) comprenant un seul point de fixation (15) à ladite partie fixe (6) disposée à l'une de ses extrémités, et des moyens d'entraînement de l'engrenage (11).
PCT/EP2018/000131 2017-03-31 2018-03-28 Mécanisme d'entraînement pour bossoirs pivotants WO2018166657A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES201700360A ES2685194B1 (es) 2017-03-31 2017-03-31 Mecanismo de accionamiento para davits pivotantes
ESP201700360 2017-03-31

Publications (1)

Publication Number Publication Date
WO2018166657A1 true WO2018166657A1 (fr) 2018-09-20

Family

ID=62148292

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2018/000131 WO2018166657A1 (fr) 2017-03-31 2018-03-28 Mécanisme d'entraînement pour bossoirs pivotants

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ES (1) ES2685194B1 (fr)
WO (1) WO2018166657A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191500151A (en) * 1914-01-15 1915-06-10 Jacob De Beer Improvements in Means for Launching Lifeboats.
US1389338A (en) * 1920-02-20 1921-08-30 Alexander Robert Hills Ship's davit
GB230215A (en) * 1924-01-11 1925-03-12 Robert Ford Holmes Improvements in and relating to ships davits
GB363805A (en) * 1930-10-14 1931-12-31 Karl Dingertz Improvements in or relating to davits
US2023258A (en) * 1933-11-16 1935-12-03 Young James Davit
DE944707C (de) * 1952-12-11 1956-06-21 Max Schramm Schwerkraftdavit

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB190915897A (en) * 1908-07-11 1910-01-27 Andreas Persen Improvements in Apparatus for Launching Boats.
GB122595A (en) * 1918-08-08 1919-01-30 Thomas Henry Marten Improvements in Davits for Ship's Life Boats.
GB165492A (en) * 1920-01-31 1921-06-30 Henry Ramsden Mortell Improvements in boat and the like stowing, lowering and releasing gear or apparatus
FR2994685B1 (fr) * 2012-08-22 2014-08-15 Acebi Stabilisateur de cable de manœuvre d'une charge, telle qu'une embarcation, et installation de manutention de charge integrant un tel stabilisateur
CN205396449U (zh) * 2016-02-23 2016-07-27 江阴耐波特船用设备有限公司 液压倒臂式吊艇架

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191500151A (en) * 1914-01-15 1915-06-10 Jacob De Beer Improvements in Means for Launching Lifeboats.
US1389338A (en) * 1920-02-20 1921-08-30 Alexander Robert Hills Ship's davit
GB230215A (en) * 1924-01-11 1925-03-12 Robert Ford Holmes Improvements in and relating to ships davits
GB363805A (en) * 1930-10-14 1931-12-31 Karl Dingertz Improvements in or relating to davits
US2023258A (en) * 1933-11-16 1935-12-03 Young James Davit
DE944707C (de) * 1952-12-11 1956-06-21 Max Schramm Schwerkraftdavit

Also Published As

Publication number Publication date
ES2685194B1 (es) 2019-07-18
ES2685194A1 (es) 2018-10-05

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