A SHIP'S EMBARKATION DEVICE

Abstract: A ship's embarkation device and comprises a projecting means, e.g. a ladder (3), which atone end is pivotally connected to a first platform (2), which is pivotally connected to the ship's deck, and at its other end is pivotally connected to a second platform (4). The first and second platforms are unrotatably connected to each other via a connecting bar (5), which is pivotally arranged at both platforms. The connecting bar always keeps the second platform in a horizontal position as well as strengthens the torsional resistance of the device. Moreover the ladder is kept tighter to the ship's deck, which prevents the ladder from swinging as the ship is rolling.

Description: A SHIP'S EMBARKATION DEVICE The technical field. The present invention refers to a ship's embarkation device comprising of at least one projecting means, e.g. a ladder, to the one end of u/hich there is pivotally attached a first platform, u/hich is connected to the ship's deck, and to the opposite end of u/hich a second platform is pivo ¬ tally attached. The background of the invention When installing conventional accomodation ladders (Suedish patent 369.696) uhich also are intended to be used as embarkation devices for pilots etc. a fairly large-scale operation is required on the ship's deck. The platform, uhich is pivotally connected to the ship's deck, is via a torsion axle connected to one or even tiuo folding davits, tuhich are to be u/elded on to the deck. This also applies to the supports for the torsion axle. The davits and the wires running via them shall aliuays keep the second "lou/er" platform in parallel uiith the ship's deck. The ladder is operated by means of uires, u/hich run from the ladder via the davits to brackets and to a uinch each. The brackets have to be u/elded on to the deck as u/ell, and takes up some spac This type of accomodation ladders fulfils very high demands for safety con ¬ sidering embarkation of e.g. pilots and the operation of the ladder and is mainly intended for large ships. According to a previously knou/n accomodation ladder (the Danish patent 5764) the steps are pivotally connected by longitudinal beams uith an upper platform u/ith the purpose of automatically keeping the steps horizon¬ tal at different inclinations of the ladder. The device has no louer plat¬ form and is not arranged or intended as an embarkation device for pilots and similar. Summary of the invention The purpose of the present invention is to provide a constructively simple and thereby cheaper embarkation device, by uhich a simplified installation is achieved at the same time as a perfectly satisfac¬ tory function and safety of the accomodation ladder is maintained and the louer platform shall aluays automatically be kept in a horizontal position. The procedure of turning the device to the stou/age position u/ill be simplified as uell. According to the invention this has been solved by pivotally arranging at least one connecting bar betu/een the first and the second platform via first and second pivot axles, thus providing an unrotatable connection betu/een the platforms, u/hich is intended * aluays to keep the second platform in a horizontal positon and also to strengthen the torsional resistance of the device.' The Danish patent specification No. 5764 shou/s an accomodation ladder u/ith' a connecting member, uhose purpose, hou/ever, is only to parallel the steps of the ladder. This device has no second platform. The device according to the invention illustrates several important ad¬ vantages, some of them mentioned belou/. Only a feu details have to be u/elded on to the deck and the stowage spa required is exceedingly small. The connecting bar stabilizes the ladder makes it steadier and safer to ualk on. There is no need of davit arms structing the through-fare on the ladder uhen this is hoisted to its upper position. Furthermore, the ladder is kept against the ship's side more firmly than at devices hanging in vertical uires, and this prevent the ladder from swinging when the ship is rolling. The connecting bar always keeps the lower platform in a horizontal position and also takes up the torsional forces between the platforms when the ladder is turned to and from the stowage position. Further characteristics of the invention will be evident from the sub-c and from the following specification, in which some embodiments are mor closely described in accordance with the enclosed drawings. Description of the drawings Figure 1 is a schematic side view of an accomodation ladder according to the invention, Figure 2 is a plane view of the accomodation ladder according to figure 1, Figure 3 is a schematic side view of an accomodation ladder according to another embodiment, Figure 4 is a plane view of the accomodation ladder according to figure 3, Figure 5 is a perspective view showing an accomodation ladder according to the invention, provided with a device for swinging the ladder out from the ship's side, Figure 6 is a perspective view showing a modification of the upper platform of the accomodation ladder, Figure 7 is a plane view of a further embodiment, Figure 8 is a side view of the accomodation ladder according to figure 7, and Figure 9 is an end view of the ladder according to figures 7 and 8 in a stowed position. Description of some preferred embodiments The ship's deck is denoted with the numeral 1. A first "upper" platform 2 is pivotally attached to the deck 1 via a pivot axle 24, and the accomoda¬ tion ladder 3 is pivotally mounted to said platform 2 via pivot axles 17. A second platform 4 is pivotally attached to the opposite "lower" end of the ladder 3 via pivot axles 18. The platforms 2 and 4 are connected by means of a torsion connecting bar 5, which is pivotally mounted via pivot axles 14 and 15 to the two platforms, which thereby are always kept parallel to each other, that is horizontal at every position of the ladder. The connecting bar 5 takes up the torsion forces between the platforms 2 and 4 at the turning of the ladder to and from the stowage position. At the second platform 4 there is attached an arm 6 projecting from said platform, . which arm extends along the ladder 3 on the inside. The accomodation ladder is supported by at least one wire 7 which according to the embodiment in figures 1 and 2 runs from a winch 8.through a block 9 arranged above the deck, e.g. at an upper deck, mast or similar of the ship, and round pulley 10 at the outer corner of the second platform 4 mote from the ladder 3, round a pulley 11 at the inner corner of platfo 4, remote from the ladder 3 along the inside of the arm 6, round a pull 12 at the free end of the arm 6 and to an attachment 13 at the deck 1. hoisting of the accomodation ladder is thus performed with double wire parts, at which the winch 8 is .exposed to less tension. Only one drum i required on the winch 8. In this embodiment the pivot axles 14 and 15, respectively, of the conn ting bar 5 are mounted to the first and second platforms 2 and 4, respe tively, at a support 6 on the inside of the first platform 2 resp. at arm 6; so that the pivot axles 14 and 15 are located in other vertical than the " pivot axles 17 and 18, respectively of the ladder 3. By this a effect is achieved, which stabilizes the second platform 4 when the lad lowered. Figure 1 shows with continuous lines the accomodation ladder i hoisted-up position, while a lowered position is shown with dash-dotted According to figure 1, plane A, going through the axles 14 and 17, is e tially parallel with the plane going through the axles 15 and 18. This true for any position of the ladder. Furthermore the distance C between axles 14 and 17 is essentially equal to the distance D between the axle 15 and 18. According to figures 3 and 4 of the embodiment there is a possibility t hoist the accomodation ladder also to a position above the deck 1, whic be desired in harbours with great differences in tide and when ships ar so heavily loaded that the deck may be lower than the quay. According t this embodiment the attachment 13 of the wire 7 is therefore arranged a the deck 1 on the same level as the block 9, end the connecting bar 5 i placed at a larger distance from the ladder 3 than according to figures and 2 of the embodiment, at which the wire 7 runs between the ladder 3 the connecting bar 5. The pivot axles 14 and 15 resp., of the connectin bar 5 are located in the vertical plane through the pivot axles 17 and 18, resp., of the ladder 3 in order to make it possible to raise as wel as lower the ladder relative to the deck 1. Figure 3 shows, with contin lines, the ladder 3 in a horizontal position at the deck and, with dash-dotted lines, the ladder when hoisted to a position above the deck and lowered to a position below the deck. BAD ORIGINAL In the embodiment illustrated in figure 5 there is arranged on the deck 1 a swing boom 19, at the free end of which is arranged a block 20. The wire 7 runs from the winch via the block 20 to the second platform 4 and back to a hook 21 hanging down from the boom 19, where it is attached. Said hook 21 is intended to catch the ladder 3, when this has been hoisted up to a hori¬ zontal position. Instead of the hook 21 a disc or a wire-disc can be arranged on the boom 19. When the ladder has been hoisted so that the pulley 12 reache the hook 21 or the disc or the attachment point 13 (fig. 2) the ladder and its platforms is turned up to a vertical position or stoβing position owing to that the pulley 12 of the second-platform 4 at the connecting bar 5 is kept in place while the outer further side of the platform 4 is hoisted farther. The torsional movement of the platform 4, thus arising, is trans¬ ferred tb the first platform 2 via the_ connecting bar 5. By this arrange¬ ment the ladder 3 can be swung out from the ship's side by swinging the boom 19. This can be necessary in case the ship does not lie close to the quay 22, e.g. due to protecting fenders 23 arranged at the quay 22. In the embodiment according to figure 6 the stowage is performed in a some¬ what different way. In this case a parallel movement of the accomodation ladd takes place from a position outside the deck 1 to a position on the deck and vice versa. This can be necessary in those cases where the deck 1 is located below the quay and the ship's side is so close to said quay that it is impossible to place the ladder between the ship and the quay. In such a case the ladder 3 can be hoisted up from its position on the deck. Said parallel movement is done by displacing the first platform 2 on the deck 1 in guides 25. The embodiment according to the figures 7-9 is at first hand intended for small ships and is for this reason further constructively simplified com¬ pared to the above described embodiments. Thus the arm 6 is missing and the device is operated only with one wire part 7. The connecting bar 5 is placed under the ladder 3 and is preferably represented by a tube, which at both ends is provided with perpendicularly arranged tubular pieces 33, which by means of discs 34 are pivotally connected to the respective platform 2, 4 via the pivot axles 14 and 15 resp. By designing - x REAT " BAD ORIGINAL OMPI & BI RNAT.OI the connecting bar 5 in this way it can transfer torsion forces, which necessary when the ladder is turned to and from its stowing position on the ship's deck. On the side of the platform 4 facing the ship's side an arm 28 is arran at the free end of which a roller 29 is mounted. When the device is hoi the roller will rest against the ship's side and when the second platfo 4 has reached the level of the ship's deck 1 the roller ' 29 will roll up a track 30, which at its upper end has a curved portion 31 catching the roller 29, at which when the wire 7 is further pulled the device will b pivoted about the pivot axles 24 and take the vertical position shown i figure 9. In this position the ladder rests on the upper part of a brac 32, at which also said track is arranged. In this position the device i lashed in a suitable way. When the device is to be lowered the lashings are released and the wire is slackened, at which the device is lowered in a very simple way. The invention is not limited to the embodiments shown but can be varied within the scope of the following claims. Thus, instead of the ladder 3, there can be a projecting means comprising of a tube or framework con¬ struction, at which the person or persons, who are to be taken on board, board(s) the second platform, which after this by means of the winch is lifted up on a level with the ship's deck. OMPI ^RN!Ύ\

Claims: C L A I M S 1. A ship's embarkation device comprising at least one pro¬ jecting means, e.g. a ladder (3), to the one end of which there is pivotally attached a first platform (2) connected to the ship's deck, and to the opposite end of which a second platform (*0 is pivotally attached, c h a r a c t e r i z e d i n, that at least one connecting bar (5) is pivotally arranged between the first (2) and the second platform (<4) via first and second pivot axles (1*1, 15), said bar providing an unrotatable connec¬ tion between the platforms (2, *0, which is intended always to keep the second platform (*0 in a horizontal position as well as to strengthen the torsional resistance of the device. 2. A ship ' s embarkation device according to claim 1, c h ¬ r a c t e r i z e d i n, that the plane (A) going through the first pivot axle (17) of the projecting means (3) and the first pivot axle (1*0 of the connecting bar (5) is essentially parallel with the plane (B) going through the second pivot axle (18) of the projecting means and the second pivot axle (15) of the connec¬ ting bar. 3. A ship's embarkation device according to claim 2, c h a ¬ r a c t e r i z e d i n, that the distance (C) between the first pivot axle (17) of the projecting means (3) and the first pivot axle (1*1) of the connecting bar (5) is essentially equal to the distance (D) between the second pivot axle (18) of the projecting means and the second pivot axle (15) of the connecting bar. *1. A ship's embarkation according to claim 3, c h a r a c ¬ t e r i z e d i , that the first and second pivot axle resp. (1*1 and 15 respectively) of the connecting bar (5) is arranged in another vertical plane than the first and second pivot axle resp. (17 and 18 respectively) of the projecting means (3). 5. A ship's embarkation device according to claim 3, c h r a c t e r i z e d i n, that the first and second pivot axl resp. (1*1 and 15, respectively) of the connecting bar (5) is arranged in the same vertical plane as the first and second pi axle resp. (17 and 18 respectively) of the projecting means. 6. A ship's embarkation device according to any of the pre vious claims, c h a r a c t e r i z e d i n, that the connec bar (5) is arranged parallel with and along the one side edge the projecting means (3). 7. A ship's embarkation device according to any of the pre claims, c h a r a c t e r i z e d i n, that an arm (6), ext towards and parallel with the projecting means (3), is attache to the platform (*0, at the free en of which arm there is mou a first pulley (12) for a wire (7), which is led via a second pulley (10) at the diametrically opposite end of the platform 8. A ship's embarkation device according to any of the pre vious claims, c h a r a c t e r i z e d i n, that a swing b (19) is arranged on the deck (1) and at said boom a block (20) for the wire (7) is arranged and also a member (21) to which t wire is attached, said member being arranged to catch the proj ting means (3), when this is hoisted up to a horizontal positi at which a stowage of the device on the deck (1) can be perfor in the usual way. 9. A ship's embarkation device according to any of the pre vious claims, c h a r a c t e r i z e d i n, that the devic is vertically adjustable relative to the deck (1) from a middl position on the deck to a position above the deck and to a pos tion below the deck at the ship's side, respectively. 10. A ship's embarkation device according to claim 9, c h a r a c t e r i z e d i , that the first platform (2) is dis- placeable in transverse direction of the ship along guides (25 from a position where the device is located on the deck (1) to position outside the ship's side. BAD ORIGINAL ^^UREΛ Oi PI fa W1PO

Inventors: NILSSON P
Applicants: NILSSON P, WELIN AB
Application year: 1979
Main classification: B63B27
IPC codes: B63B27