AU2001236247A1 - Seal for a suction cup and method for accommodating large movements in a mooring system - Google Patents
Seal for a suction cup and method for accommodating large movements in a mooring systemInfo
- Publication number
- AU2001236247A1 AU2001236247A1 AU2001236247A AU2001236247A AU2001236247A1 AU 2001236247 A1 AU2001236247 A1 AU 2001236247A1 AU 2001236247 A AU2001236247 A AU 2001236247A AU 2001236247 A AU2001236247 A AU 2001236247A AU 2001236247 A1 AU2001236247 A1 AU 2001236247A1
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- Australia
- Prior art keywords
- mooring
- operating
- robot
- mooring system
- seal
- Prior art date
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Description
TITLE: METHOD FOR ACCOMMODATING LARGE MOVEMENTS IN A MOORING SYSTEM
TECHNICAL FIELD
The present invention relates to mooring devices for mooring vessels and, more particularly to a method and mooring system for accommodating large relative movements between two objects moored or secured together
BACKGROUND ART
One disadvantage of traditional mooring is the necessity to constantly adjust the mooring lines, particularly when a ship is secured to a fixed dock. This adjustment is to account for movement of the ship in response to winds, shifting tides, the addition or removal of cargo, and the like The combination of high tidal movements and variations in ship displacement due to loading can result in a considerable vertical movement having to be accommodated by the mooring system.
With a mooring device such as that described in the co-pending application based upon New Zealand Patent application No 501395 (which specification is incorporated herein by reference), a vacuum attachment cup assembly is fixed to the ship's hull. Mechanical means limits movement of mooring robot up and down over the full extent of the relative vertical travel This possible movement necessitates a larger working area, with consequent complication and increased cost
Japanese patent abstract publication no 58206478 describes a mooring device and a method of changing the position of a vacuum cup fastening the device to the hull. When the device reaches the limits of its vertical travel the negative pressure in the vacuum cup is raised to a degree permitting the cup to slide without releasing from the hull At its limits of travel this passive method therefore offers greatly reduced mooring forces, making the moored vessel vulnerable to failure of the mooring in adverse conditions of weather and current The seal of the vacuum cup also suffers from abrasion when the cup slides down the hull in this manner and so to avoid
regular sliding movement during operation the mooring device is provided with increased mechanical travel in the vertical direction, with consequent added complication and expense.
It is an object of the present invention to provide a mooring system and method of operating a mooπng system for accommodating a large relative vertical movement of a ship when docked. It is a further objective of the present invention to provide a mooring system and method and system for accommodating a large relative vertical movement of a ship when docked which overcomes the problems of the prior art.
A still further object of the present invention is the provision of a seal for use in an attachment element for use on a mooring robot.
It is an object of the present invention to address the foregoing problems or at least to provide the public with a useful choice.
Further aspects and advantages of the present invention will become apparent from the ensuing description which is given by way of example only. DISCLOSURE OF INVENTION
According to one aspect of the present invention there is provided a seal for a vacuum attachment element, which element can be secured against a surface, said seal comprising a circumferential seal member of substantially constant cross-section, said member being mountable in a support frame rigidly fixed to the attachment element, the seal member being of elastomeπc material and including:
a first sealing face which has an arcuate portion between inner and outer edges, wherein partial deformation of the said first sealing face is required before the said inner sealing edge contacts the surface.
According to another aspect of the present invention there is provided a seal for an attachment
element substantially as described above, wherein the attachment element is part of a mooring robot.
According to another aspect of the present invention there is provided a seal for an attachment element substantially as described above, wherein the mooring robot releasably fastens to the surface, being a surface of a first moveable object, the mooring robot being mountable to a second object, said first object moving m response to the application of external forces, relative to the second object, which movement moves the first object from a pre-deterrmned operating position, of the type as described m the co-pending application based upon New Zealand Patent application No. 501395.
According to a still further aspect of the present invention there is provided a method of operating a mooring system, which system includes at least a first and second mooring robot, each mooring robot having a robot arm with at least one attachment element for releasable engagement with a surface, wherein the operating method involves stepwise movements to re-position the attachment elements between respective starting and a finishing positions in which positions all attachment elements are fastened to the surface, the method including the steps:
(a) with respect the first mooπng robot, releasing all respective first attachment elements from engagement with the surface;
(b) moving all said first attachment elements, by operation of the first mooring robot, and re-fastenmg said elements in the respective finishing position on the surface;
(c) with respect to the second mooring robot, releasing all respective second attachment elements from engagement with the surface, and
(d) moving all said second attachment elements, by operation of the second mooring robot, and re-fastening the said elements in the respective finishing position on the surface.
According to a still further aspect of the present invention there is provided a method of operating a mooring system, substantially as described above, including the steps:
(e) with respect to any further mooring robots releasing all respective attachment elements from engagement with the surface; and
(f) moving all said respective attachment elements, by operation of the mooring robot, and re-fastenmg the said attachment elements m the respective finishing position on the surface.
According to a still further aspect of the present invention there is provided a method of operating a mooring system, substantially as described above, wherein the steps are performed sequentially.
According to a still further aspect of the present invention there is provided a method of operating a mooring system, substantially as described above, wherein the steps (a) and (c) and the steps (b) and (d) in respect of each mooring robot, are performed at the same time.
According to a still further aspect of the present invention there is provided a method of operating a mooring system, substantially as described above, wherein the mooring robots are mounted to a fixed or floating dock and the said surface is part of the freeboard of a ship's hull. Alternatively, the mooring robots may be mounted to a floating vessel for mooring to another vessel or a plate fixed to a fixed or floating dock.
According to a still further aspect of the present invention there is provided a method of operating a mooring system, substantially as described above, wherein each mooring robot includes means for at least two translational degrees of freedom for positioning each attachment element. Most preferably the mooring robot provides three-degrees of translational freedom for controlling of the position of each attachment element and each attachment element is pivotally fixed to the movement mechanism.
According to a still further aspect of the present invention there is provided a method of operating a mooring system, substantially as described above, wherein the stepwise movement is performed in the vertical direction, allowing the mooring system to accommodate large vertical movements between a ship and its dock. One or two of the mooring robots may be at or approaching the
limits of vertical travel before the stepwise movement is initiated. Alternatively, the stepwise movement may be performed in the horizontal direction for providing movement of the ship in the fore-and-aft direction.
According to a still further aspect of the present invention there is provided a method of operating a mooring system, substantially as described above, wherein the method is performed with a mooring system which includes mooring robots as described m New Zealand Patent application No. 501395. Four mooring robots, in first and second pairs are employed, the first pair performing the stepwise movement while the second pair remains fastened to the ship. Alternatively both the first and second pairs may perform the stepwise movement together.
According to a still further aspect of the present invention there is provided a method of operating a mooring system, substantially as described above, wherein the attachment element is an array of vacuum cups, each vacuum cup having a seal as described according to the first aspect above.
It will be appreciated that one of the cups of the each mooring robot is sufficient to hold that portion of the ship moored, during the operation of the above described method. Thus very large vertical movements of a vessel can be accommodated, without the need to re-moor a vessel and without risking the security of the mooring system.
BRIEF DESCRIPTION OF DRAWINGS
Further aspects of the present invention will become apparent from the following description which is given by way of example only and with reference to the accompanying drawings in which:
Figure 1 is a plan view of a pair of mooring robots, being a first preferred arrangement for performing the stepwise movement method according to the present invention,
Figure 2 is a front elevation illustrating the vertical travel of the vacuum cups of the mooring robots according to Fig 1 ;
Figure 3 is front elevation of the vacuum cups of Fig. 2 at an intermediate stage in the stepping movement of the present invention;
Figure 4 is a sectional view of a vacuum cup provided with a seal according to the present invention in a released position, and
Figure 5 is a sectional view of a vacuum cup provided with a seal according to the present invention fully engaged with a hull surface.
BEST MODES FOR CARRYING OUT THE INVENTION
Referring to Fig. 1 of the drawings, a device for performing the method of the present invention comprises the first preferred embodiment of a mooring system 500, as described in the co- pending PCT application based upon New Zealand Patent application No. 501395 is illustrated in plan view. The description of the mooring robot and mooring system in the co-pending application is hereby incorporated by reference.
Other preferred embodiments (not illustrated) include a mooring system 500 wherein mooring robots 100 are fixed to the ship S allowing the ship S to be readily fastened to a bearing plate fixed to the dock 50 or to another ship S. It will be appreciated, however, that this as well as other robot type mooring devices may be employed for performing the method of the present invention.
In the following description 100a, 100b have been used to refer to two specific examples of the mooring robot 100. Fig. 1 shows a first mooring robot 100a and a second mooring robot 100b fixed to the dock 50 for mooring a ship S. The mooring system 500 includes at least two pairs of mooring robots 100a, 100b at spaced positions along a mooring face of the dock 50. Each mooring robot 100 has two separate vacuum cups 1 pivotally fixed to a robot arm 10 and permitting accurate positional control of the vacuum cups 1 in three dimensions.
The method of operating the mooring system 500 providing a stepwise movement is described below with reference to Fig. 2. To accommodate a ship S falling or rising relative to the dock 50 (Fig. 1), the vacuum attachment cups 1 fixed to the hull are raised or lowered respectively. It will be appreciated, however, that the same stepwise movement method applies to other relative movement such as moving the vacuum attachment cups 1 from side-to-side in the longitudinal direction, so the following description should not be seen a limiting.
Before mooring the ship S, each vacuum attachment cup 1 is initially free (Figs. 1 and 4). From initial engagement each cup 1 moves through partial engagement (not shown) to complete engagement (Fig. 5) wherein both the seal 60 and the abutment member 61 are fully compressed.
Referring to Figs. 2 & 3, the vacuum attachment cups 1 of both mooring robots (100a, 100b) are fixed to the hull at approximately the same height H2 and the mooring robots (100a, 100b) are able to accommodate a limited degree of vertical travel either side of height H2, between an upper limit of travel at height HI and a lower limit of travel at H3. The heights HI, H2, H3 are absolute heights relative to the fixed dock 50.
When the controls (not shown) of the mooring system 500 detects a requirement to raise the mooring robots 100, due to a mooring robot (100a, 100b) approaching the limit of its downward travel H3 (through either a falling tide or the addition of cargo) the stepwise movement of the vacuum attachment cups 1 is then initiated.
Fig. 3 shows an intermediate stage during the process of raising the vacuum cups 1 from height H3 to height H4. The vacuum cups 1 of the first mooring robot 100a have been released and the vacuum cups 1 raised to height H4 Before moving the vacuum attachment cups 1 they are completely released from engagement with the hull (to a position as shown in Fig. 4) thereby allowing the movement to be completed more quickly, as is desired.
Next the vacuum cups 1 of the first mooring robot 100a are fully engaged (Fig. 5). On indication of complete engagement, the second mooring robot 100b is also raised to height H4 in the same manner.
A first preferred embodiment of a seal 60 according to the present invention is shown in Fig. 6. The seal 60 provides a continuous seal around the circumference of each vacuum cup 1 , to which it is rigidly fixed. The seal 60 is made from elastomeπc material, preferably neoprene. It includes a first arcuate sealing face 62 between an inner sealing edge 63 and on outer sealing edge 61.
The seal 60 is optionally used to form the perimeter of each vacuum cup 1 used in the method of the present invention. However, it will be appreciated by those skilled in the art that other seals may also be used without departing from the scope of the inventive method.
This configuration of the seal 60 allows it to absorb irregularities in the surface to which cup 1 is attached. During engagement of the seal 60, an initial seal is attained with partial deformation of the outer sealing edge 61 at the partial engagement stage (nor shown) before the inner sealing edge 61 contacts the hull of the ship S. With this seal 60 there has been found to be a predictable relationship between the amount of deformation at the partial engagement stage and the vacuum applied to the vacuum cups 1.
In the partial engagement stage the arcuate face 62 is readily adapted for sliding engagement with the hull of a ship S or another surface.
The above method of operating a mooring system has been described with reference to vessel moored to a dock, which may be either fixed or floating. However, it will be appreciated thatthe dock may be replaced by a vessel (so that there is vessel to vessel docking and relative movement). Also, it will be appreciated that the mooring system, described herein as affixed to the dock, may be fixed to the vessel. The operation is the same except that the surface is a surface affixed to the dock.
Also, the above method of operating a mooring system has been described with reference to vessel moored to a dock. It will, however, be appreciated that another type of vessel or object may be moved relative to a second object, for example under water, etc without departing from the scope of the invention.
Aspects of the present invention have been described by way of example only and it should be appreciated that modifications and additions may be made thereto without departing from the scope thereof.
Claims (19)
1. A seal (60) for a vacuum attachment element (1), which element (1) can be secured against a surface (51), said seal (60) comprising a circumferential seal member of substantially constant cross-section, said member being mountable m a support frame (65) rigidly fixed to the attachment element (1), the seal member being of elastomeπc material and including:
a first sealing face (62) which has an arcuate portion between inner and outer edges(61 , 63), wherein partial deformation of the said first sealing face (62) is required before the said inner sealing edge (63) contacts the surface (51)
2. A seal (60) as claimed in claim 1 wherein said attachment element (1) is part of a mooring robot (100).
3 A seal (60) as claimed in claim 2 wherein said surface (51) is a surface of a first, moveable object S and the mooring robot (100) is secured to a second object (50), said first object S moving m response to the application of external forces, relative to the second object (50), which movement moves the first object S from a pre-determined operating position; wherein the mooring robot (100) operates to move the first object S back to the pre-determined operating position.
4. A method of operating a mooring system (500), which system (500) includes at least a first and second mooring robot ( 00a, 100b), each mooring robot (100) having a robot arm with at least one attachment element (1) for releasable engagement with a surface (51), wherein the operating method involves stepwise movements to re -position the attachment elements (1) between respective starting and a finishing positions in which positions all attachment elements (1) are fastened to the surface (51), the method including the steps: (a) with respect the first mooring robot (100a), releasing all respective first attachment elements (1) from engagement with the surface (51);
(b) moving all said first attachment elements (1), by operation of the first mooring robot (100a), and re-fastening said elements (1) in the respective finishing position on the surface;
(c) with respect to the second mooring robot (100b), releasing all respective second attachment elements (1) from engagement with the surface (51); and
(d) moving all said second attachment elements (1), by operation of the second mooring robot (100b), and re-fastening the said elements (1) m the respective finishing position on the surface.
5. A method of operating a mooring system (500) as claimed in claim 4 including the steps:
(e) with respect to any further mooring robots (100) releasing all respective attachment elements (1) from engagement with the surface (51); and
(f) moving all said respective attachment elements (1), by operation of the mooring robot
(100), and re-fastenmg the said attachment elements (1) m the respective finishing position on the surface.
6 A method of operating a mooring system (500) as claimed in claim 4 or claim 5 wherein the steps (a) to (d) are performed sequentially.
7. A method of operating a mooring system (500) as claimed in claim 4 or claim 5 wherein the steps (a) and (c) and the steps (b) and (d) m respect of each mooring robot (100) are performed at the same time.
8. A method of operating a mooring system (500), as claimed in any one of claims 3 to 7 wherein the mooring robots (100) are mounted to a fixed or floating dock (50).
9. A method of operating a mooring system (500), as claimed in any one of claims 3 to 8 wherein the said surface (51) is part of the freeboard of a ship's hull.
10. A method of operating a mooring system (500), as claimed in any one of claims 3 to 9 wherein the mooring robots (100) are mounted to a floating vessel.
11. A method of operating a mooring system (500), as claimed claim any one of claims 3 to 10 wherein each mooring robot (100) provides means for at least two translational degrees of freedom for positioning the attachment element (1).
12 A method of operating a mooring system (500), as claimed in any one of claims 3 to 11 wherein the first and second mooring robots each include an attractive attachment element (1) for releasable engagement with the surface (51), the attractive element being pivo tally fixed to the movement mechanism (10), the movement mechanism (10) comprising a movement unit (10) with three degrees of translational movement, wherein the movement unit (10) includes a resilient restorative means associated with each of two degrees-of- freedom of the movement thereof m the horizontal plane, the resilient restorative means providing a restorative force acting to return the attachment element (1) to the predetermined operating position.
13. A method of operating a mooring system (500), as claimed in any one of claims 3 to 12 wherein the stepwise movement is performed m the vertical direction.
14. A method of operating a mooring system (500), as claimed in any one of claims 3 to 13 wherein the stepwise movement is performed in the horizontal
15. A method of operating a mooring system (500), as claimed in any one of claims 3 to 14 wherein at least four mooring robots (100), in first and second pairs are employed.
16 A method of operating a mooring system (500), as claimed m claim 4 wherein the attachment element (1) includes an array of vacuum cups, each vacuum cup having a circumferential seal (60) as claimed in any one of claims 1 to 3
17. A mooring system (500) for operation according to the method of operating a mooring system (500) as claimed m any one of claims 4 to 16 and substantially as hereinbefore described with reference to the accompanying drawings.
18 A seal (60) for an attachment element (1) as claimed in any one of claims 1 to 3, and substantially as hereinbefore described with reference to the accompanying drawings
19. A method of operating a mooring system (500) as claimed in any one of claims 4 to 16, substantially as hereinbefore described with reference to the accompanying drawings.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NZ50139400 | 2000-02-26 | ||
| NZ501394 | 2000-02-26 | ||
| PCT/NZ2001/000025 WO2001062584A2 (en) | 2000-02-26 | 2001-02-26 | Seal for a suction cup and method for accommodating large movements in a mooring system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2001236247A1 true AU2001236247A1 (en) | 2001-11-15 |
| AU2001236247B2 AU2001236247B2 (en) | 2005-04-07 |
Family
ID=19927641
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2001236247A Ceased AU2001236247B2 (en) | 2000-02-26 | 2001-02-26 | Seal for a suction cup and method for accommodating large movements in a mooring system |
| AU3624801A Pending AU3624801A (en) | 2000-02-26 | 2001-02-26 | Mooring device |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU3624801A Pending AU3624801A (en) | 2000-02-26 | 2001-02-26 | Mooring device |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US6910435B2 (en) |
| EP (1) | EP1259419B1 (en) |
| JP (1) | JP4768190B2 (en) |
| AU (2) | AU2001236247B2 (en) |
| CA (1) | CA2401237C (en) |
| NO (1) | NO330678B1 (en) |
| PT (1) | PT1259419E (en) |
| WO (1) | WO2001062585A1 (en) |
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| AU4795997A (en) * | 1996-10-21 | 1998-05-15 | John Mackay Hadcroft | Vacuum fastening pad |
| JP2003520725A (en) | 2000-01-07 | 2003-07-08 | エフ・エム・シー・テクノロジーズ・インク | Mooring system with active reaction system and passive damping |
| CA2401235C (en) | 2000-02-26 | 2008-10-21 | Mooring Systems Limited | Method for accommodating large movements in a mooring system |
-
2001
- 2001-02-26 JP JP2001561610A patent/JP4768190B2/en not_active Expired - Fee Related
- 2001-02-26 EP EP01908506A patent/EP1259419B1/en not_active Expired - Lifetime
- 2001-02-26 US US10/220,009 patent/US6910435B2/en not_active Expired - Lifetime
- 2001-02-26 AU AU2001236247A patent/AU2001236247B2/en not_active Ceased
- 2001-02-26 PT PT01908506T patent/PT1259419E/en unknown
- 2001-02-26 CA CA002401237A patent/CA2401237C/en not_active Expired - Lifetime
- 2001-02-26 AU AU3624801A patent/AU3624801A/en active Pending
- 2001-02-26 WO PCT/NZ2001/000026 patent/WO2001062585A1/en active IP Right Grant
-
2002
- 2002-08-26 NO NO20024064A patent/NO330678B1/en not_active IP Right Cessation
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