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
  • B63B23/40—Use of lowering or hoisting gear
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
  • B63B27/00—Arrangement of ship-based loading or unloading equipment for cargo or passengers
  • B63B27/36—Arrangement of ship-based loading or unloading equipment for floating cargo

Definitions

• the invention relates to a device for launching and hoisting up a lifeboat, pick-up boat, etc., and for picking up persons and objects floating in the water, which comprises two booms from which ropes extend to two elongated buoyancy means which are connected at a mutual distance and are connected with the ropes by the aid of spreader yokes, from which lines extend to the buoyancy means, and bottom members spanning the space between said buoyancy means and being in the water when the buoyancy means are afloat, said lines extending in guides on the buoyancy means and acting as guides of the buoyancy means when the latter are afloat, said lines being connected with the respective adjacent bottom members.
• a device for launching and hoisting up a lifeboat, pick-up boat, etc. which comprises two booms from which ropes extend to elongated buoyancy means which are connected at a mutual distance and are connected with the ropes by spreader yokes from which lines extend to the buoyancy means.
• the space between buoyancy means is spanned by bottom elements which are in the water when the buoyancy means are afloat.
• the utilized booms are designed to be independent units, as known from conven ⁇ tional davit arrangements.
• To stabilize the dock formed by the buoyancy means in the water a comparatively complicated and expensive arrangement of hydraulic arms extending down into the water from supporting means placed along the ship's side is used.
• a weight lowered into the water is known to stabilize a vertically suspended line, and it is also known that said weight may be designed as a bottom member spanning a pick-up dock.
• a device as mentioned above is proposed according to the invention, which is characterized by the fact that said two booms are combined into a fork- shaped swingcrane-boom unit, that the booms are telescopic, and that ropes extend from the fixed boom sections to spreader yoke for one buoyancy means, whereas ropes exten from the extendable boom sections to a spreader yoke for th other buoyancy means.
• the davit-arrangement is, thus, abandoned and the advantages achievable by the aid of swing crane are in stead utilized.
• the doc formed by buoyancy means may be hoisted up from the water an may, by the aid of the swing crane, be slewed quite distance inwards on deck, e.g. onto the relatively protecte working deck on a supply vessel.
• Such a possibility o hoisting the dock with its content upward and inward i essential in connection with picking up hyperbaric lifeboats, because necessary equipment and assistance may, thus, reac the lifeboat.
• Each spreader yoke is connected with one buoyancy means.
• Each, spreader yoke is connected with both arms or booms o the two-armed swing crane. Due to the fact that the booms ar telescopic the position of outermost buoyancy means relativ to the swing crane may be adjusted relative to the othe buoyancy means by retraction/extension of the telescopi outer boom sections. This provides for a possibility o achieving an especially advantageous mutual adjustment o the buoyancy means, so that the dock formed by the buoyanc means may be provided with an enlarged lead-in opening b arranging the buoyancy means in a mutually divergen position. This is achieved by extending one telescopic boo more than the other one.
• said boom uni comprises a rigid fork stem which is slewable about horizontal axis on the slew ring of the crane, said two for members being telescopic. That means that only the outermos portion of the swing crane is fork shaped or two-armed.
• Thi embodiment is advantageous in that that there is one singl fork stem to be slewed and raised and lowered in stead of tw booms outside the slewing ring.
• the fork elements are, advantageously, placed to enclose a obtuse angle with the fork stem. In the normal workin position of the fork stem the fork members will then advantageously, extend horizontally outwards, i.e. fairly i parallel with the water surface. In this manner the fre length of both outer ropes is reduced.
• a control line may, advantageously, exten from each end area of the buoyancy means closest to the cran to a suitable winch.
• a three-armed line-fork may, advantageously, extend from eac rope to the corresponding spreader yoke.
• Such a design wil provide the necessary stable suspension of spreader yokes an associated buoyancy means.
• the elongated buoyancy means may, advantageously, comprise number of sequencially joined floats.
• Spreader yokes wil provide the necessary stability, at the same time as the doc will show desired flexibility in the water.
• the dock may be open at one or both ends, as required. On dock end may be closed by the aid of floats of the same kin as those used for the elongated buoyancy means.
• bottom members connect the lines beneat buoyancy means and act as spreader members.
• An especiall suitable design of the bottom members which is of Indepen dent inventive value, comprises bottom members in the shap of slings having the same length of spring steel attached t them, which are baked into a flexible material protectin both materials.
• Such a bottom member would be sufficientl rigid to provide desired spreading and will, at the sam time, at least to some degree, adapt to the shape of th object inside the dock and support said object.
• a net may, advantageously, extend in manner known per se, which is of special importance whe relatively small objects, e.g. persons, are picked up fro the water.
• the swing crane is preferably provided with a contact face which the dock may be made to contact Said control lines may advantageously be used to this end.
• Figure 1 shows an elevation of the device according to the invention, as seen along a ship's side
• Figure 2 is a plan view of the two-armed swingcrane shown in Figure 1,
• Figure 3 shows the device of Figure 1, as seen in a smaller scale towards the ship's side
• Figure 4 is a plan view of the device of Figure 3
• Figure 5 shows the device according to the invention with ropes heaved in so that the shown rescue craft is ready to be hoisted on board,
• Figure 6 shows the same situation as Figure 5, as seen towards the ship's side
• Figure 7 shows the rescue craft shown in Figures 5 and
• Figure 8 Is a plan view like Figure 4, but with the dock formed by buoyancy means in a state with an enlarged lead-in opening,
• Figure 9 shows an elevation of the rope and line arrangement at associated bottom members
• Figure 10 shows the arrangement of Figure 9 in an end view
• Figure 11 is a diagrammatical view of one half of a bottom member
• Figure 12 is a sectional view through the bottom member along sectional line XII-XII in
• Figure 13 is a view, partly in section, of a spreader yoke.
• a crane foundation 3 On deck 1 of a vessel 2 a crane foundation 3 is provided in Figure 1.
• a unit 4 On crane foundation 3 a unit 4 is slewably mounted and comprises a crane tower 5, a cranedriver's cabin 6, and a slewing ring 7.
• slewing ring 7 unit 4 By the aid of slewing ring 7 unit 4 is, thus, in a manner known per se mounted to be slewable about a vertical axis of crane foundation 3.
• a fork-shaped boom unit 8 is mounted to be slewable about a horizontal axis 9 in tower 5 and may be slewed up and down 0 about journal 9 by tbe aid of a hydraulic working cylinder 10.
• boom unit 8 The fork-shaped design of boom unit 8 will appear clearly from Figure 2, showing the swing crane from above.
• Boom unit 5 8 thus, comprises a rigid fork stem 11 and and a fork which extends at an obtuse angle relative to stem 11 and comprises two telescopic boom sections or fork members 12 and 13.
• Each fork member is comprised of a firm section 14 and 15, respectively, and a telescopic or extendable boom section 16 o and 17, respectively.
• the swing crane totally comprises four ropes extending from winches 18.
• Ropes 19, 20, 21, 22 extend over pulleys to respective vertical pulleys 23, 24, 25, 26, and then the ropes extend down to dock 27.
• lines 40 extend to spreader yoke
• each buoyanc means is built from a number of sequencially connected float 46. Connection is achieved by simple lugs which are joined b the aid of vertical bolts 47.
• the dock is closed at one end by th aid of two floats 46, which will appear most clearly fro Figures 4 and 8.
• the structure of respective bottom member 43 of the embodiment is special and is shown in detail i Figures 11 and 12.
• the bottom member in this cas consists of a polyester strap 48 onto which * a spring steel member 49 Is fastened at spaced points. Said fastening is achieved by the aid of bows 50, and the assembled members are baked into a suitable material, in the present case PVC, designated by 51.
• a suitable material in the present case PVC, designated by 51.
• hoisting bottom member 43 can adapt to the shape of the rescued object and provide good support for the object together with the buoyancy means. This is, e.g. shown in Figures 5 and 7 (compare with Figure 1). The operation of the device will now be explained in more detail with reference to Figures 1-7.
• Figure 1 dock 27 is shown in the water.
• Control lines 53, 54 serve to prevent swing during hoisting/launching operations or when the slewing crane is slewed to land the rescued object 52 on deck 1, and may be used to pull dock 27 towards a contact surface 60 on the swing crane.
• a line 57 is shown, which extends forwards to an auxiliary boom 58 cantilevered from vessel 2. Line 57 contributes to stabilize the dock in the water.
• a net 59 is extended between bottom members 43, as shown i Figures 3 and 6.
• FIG. 8 shows how the telescopic boom arms and the slewabl crane structure may be utilized to advantage.
• Crane unit 4 with fork stem 11 and associated fork members 12,13 is slightly slewed as compared witb the position shown in Figur 4, at the same time as one telescopic fork member 13 i extended causing outer buoyancy means 29 to be no longe substantially parallel with inner buoyancy means 28, but t diverge outwards relative to the latter.
• Dock 27 thus, has wider lead-in opening 60 for rescue craft 52.
• a rescue craft 52 is navigated into dock 27 hoisting operation ay start, if desired, upon or with simultaneous positionin in parallel of buoyancy means by retracting telescopic for arm 13.
• Spreader yokes 30,31 are constructed to be rigid members, a shown in Figure 13, e.g. a steel rod 61 being baked into suitable fender material 62.
• Lines 40 as shown, exten freely through bows 63 attached to the spreader yoke.
• Sinc lines 40 are through-going, and are only connected wit spreader yoke 31 to be spread the greater part of the weigh will be absorbed by the lines, and dimensions of the spreade yoke proper may, thus, be reduced.
• the new device may advantageously be winterized. All winche 18 and rope drums and pulleys may, thus, advantageously b built inside the crane, and ropes 19-22 may run inside cran booms 12,13.
• hot air either directly from th engine room of the vessel, or from a hot air ventilator (no shown) placed inside the crane proper, the device will b operationally independent of the temperature outside.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• Ocean & Marine Engineering (AREA)
• Jib Cranes (AREA)
• Indole Compounds (AREA)
• Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=42338229

Family Applications (1)

Country Status (4)

Families Citing this family (9)

Family Cites Families (5)

• 1987
  • 1987-03-18 NO NO87871103A patent/NO162184C/no unknown
• 1988
  • 1988-04-14 WO PCT/NO1988/000027 patent/WO1989009723A1/en not_active Application Discontinuation
  • 1988-04-14 EP EP88903414A patent/EP0414679A1/de not_active Ceased
  • 1988-05-05 CA CA000566022A patent/CA1326614C/en not_active Expired - Fee Related

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events