Chain Stopper

Abstract

The invention relates to a device (60), such as a chain stopper, for connecting a chain 320 or at least one portion of a chain (320) to a structure (55), such as an offshore structure or vessel. The device comprising a first portion (70) pivotably or rotatably connected or connectable to a structure (55) so as to provide movement of the first portion (70) relative to a structure (55) about or around a first axis (310) of the first portion (70). The first portion comprises a chain or line guiding means (75) arranged for rotational movement about or around the first axis (310) of the first portion (70). In some examples, the device (70) may comprise a second portion (80) pivotably or rotatably connected or connectable to the first portion (70) so as to provide movement of the second portion (80) relative to the first portion (70) about or around a second axis (315) of the second portion. In some examples, the device may comprise at least one means for engaging (85) a chain 320, the engaging means (85) being connected, such as pivotably or rotatably connected, to the second portion.

Claims

1. A device, such as a chain stopper, for connecting a chain or line or at least one portion of a chain or line, such as a mooring, tethering, anchoring chain or line or the like, to a structure, such as an offshore structure or vessel, the device comprising: a first portion pivotably or rotatably connected to the structure so as to provide movement of the first portion relative to the structure about or around a first axis of the first portion; wherein the first portion comprises a chain or line guide arranged for rotational movement about or around the first axis of the first portion.

2. A device as claimed in claim 1, wherein the device comprises a second portion pivotably or rotatably connected to the first portion so as to provide movement of the second portion relative to the first portion about or around a second axis of the second portion.

3. A device as claimed in claim 1, wherein the device comprises at least one engaging portion for a chain or line, the engaging portion being connected, such as pivotably or rotatably connected, to the device and/or the second portion of the device.

4. A device as claimed in claim 1, wherein the chain guide is arranged on or in the first portion.

5. A device as claimed in claim 2, wherein the first axis is oriented substantially perpendicular to the second axis or vice versa.

6-7. (canceled)

8. A device as claimed in claim 1, wherein the first axis comprises a substantially transverse first axis, and the first axis is substantially perpendicular to a longitudinal axis or central axis of the first portion and/or device.

9. (canceled)

10. A device as claimed in claim 2, wherein the second axis is a substantially transverse second axis, and the second axis is substantially perpendicular to a longitudinal axis or central axis of the first portion, second portion and/or device.

11. (canceled)

12. A device as claimed in claim 1, wherein the first axis is considered as extending in an x-direction, the second axis is considered as extending in a y-direction, and the longitudinal axis is considered as extending in a z-direction.

13-16. (canceled)

17. A device as claimed in claim 2, wherein the second portion comprises or defines a passage through which a chain or a portion thereof may be run, threaded and/or pulled, and wherein the passage is partially open so that a chain contained therein is visible.

18. A device as claimed in claim 2, wherein the second portion comprises a first and/or a second opening for receiving a chain, and wherein the chain exits or enters the second portion at the first opening, which is arranged at or on the second portion, such as at a proximal end of the second portion, and/or the chain exits or enters the second portion at the second opening, which is arranged at or on the second portion, such as at a distal end of the second portion.

19-20. (canceled)

21. A device as claimed in claim 3, wherein the engaging portion is arranged at the distal end of the second portion, is configured to receive a chain pulled therethrough, threaded therethrough and or directed therethrough, and/or is rotatable or pivotal relative to the second portion and/or device between a first position or configuration and a second position or configuration.

22-31. (canceled)

32. A device as claimed in claim 1, wherein the chain guide is configured to guide a chain about the first axis offset or at distance from the first axis, the first axis being provided at an end of the first portion proximal to the structure.

33. A device as claimed in claim 1, wherein the device is configured such that a proximal portion of a chain is disposed or extends at an acute angle to a longitudinal or central axis of the device.

34. A device as claimed in claim 2, wherein the first axis is offset or spaced, such as offset or spaced along a longitudinal direction and/or axis of the device, from the second axis or vice versa.

35. (canceled)

36. A device as claimed in claim 2, wherein the second axis is provided at the distal end of the first portion and/or at an end of the second proximal to the first portion.

37. (canceled)

38. A device as claimed in claim 2, wherein the first axis allows movement, such as rotational movement, of the first portion relative to a structure comprising at least one first degree of freedom, and wherein the second axis allows movement, such as rotational movement, of the second portion relative to the first portion and/or the structure comprising at least one second degree of freedom.

39-41. (canceled)

42. A device as claimed in claim 2, wherein the first and second portions of the device and/or the first and second axes allow movement, such as rotational movement, of a chain relative to the structure in two or more directions and/or planes, and wherein the at least two of the two or more directions and/or planes are substantially perpendicular to another.

43-75. (canceled)

76. A system, comprising: a structure, such as an offshore structure; and at least one device according to claim 1 for connecting a chain to the structure.

77-88. (canceled)

89. A method for mooring, tethering or anchoring a structure, such as a vessel, relative to a seabed, the method comprising: providing a device as claimed in claim 1; and running or threading a chain through the device.

90-99. (canceled)

100. A method as claimed in claim 89, wherein the method further comprises adjusting a length and/or tension of the chain by pulling, such as pulling-in or pulling substantially vertically upwards, of the chain to a desired or pre-determined length and/or tension.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0115] These and other aspects of the present invention will now be described, by way of example only, with reference to the accompanying drawings, which are:

[0116] FIG. 1 an isometric representation of a chain stopper according to the prior art;

[0117] FIG. 2 a diagrammatic view of an apparatus for connecting a chain to a structure in accordance with an embodiment of the present invention;

[0118] FIG. 3 a perspective representation of a chain table with six chain stoppers according to an embodiment of the present invention connected thereto;

[0119] FIG. 4 a perspective representation of a chain stopper in accordance with an embodiment of the present invention;

[0120] FIG. 5 (a) a side view of the chain stopper of FIG. 4 with a chain threaded therethrough;

[0121] FIG. 5 (b) an enlarged representation of an end of the chain stopper of FIG. 5 (b);

[0122] FIG. 6 a side view of the chain stopper of FIG. 5 (a) showing an acute angle between a less tensioned or slack portion of a chain and a longitudinal axis of the chain stopper;

[0123] FIG. 7 (a) a side view of the chain stopper of FIG. 5 (a) showing a tensioned portion of a chain;

[0124] FIG. 7 (b) a top view of the chain stopper of FIG. 5 (a);

[0125] FIG. 8 a perspective view of an end of the chain stopper connected to a structure;

[0126] FIG. 9 (a) a perspective view of an connection arrangement of the chain stopper of FIG. 4;

[0127] FIG. 9 (b) a further perspective view of the connection arrangement of FIG. 9(a);

[0128] FIG. 10 (a) a side view of an engagement means of the chain stopper of FIG. 4 with a chain threaded therethrough;

[0129] FIG. 10 (b) a front view of the engagement means of FIG. 10 (a) in an engaged configuration;

[0130] FIG. 10 (c) a perspective view of the engagement means of FIG. 10 (a) in a disengaged configuration;

[0131] FIG. 10 (d) a perspective view of a stopper member of the engagement means of FIG. 10 (b);

[0132] FIG. 11 (a) a perspective view of a guiding portion of the engagement means of FIG. 10 (a);

[0133] FIG. 11 (b) a further perspective view of the guiding portion of FIG. 11 (a);

[0134] FIG. 11 (c) a further perspective view of the guiding portion of FIG. 11 (a) showing a first and second guiding aperture; and

[0135] FIG. 11 (d) a top view of the guiding portion of FIG. 11 (a).

DETAILED DESCRIPTION OF DRAWINGS

[0136] Referring to FIG. 1, there is shown a first embodiment of a device, such as a chain stopper 5 according to the prior art. The chain stopper 5 comprises two axes of rotation 10, 15. The chain stopper 5 allows rotation of the chain around a generally horizontal first axis 10 and a generally vertical second axis 15.

[0137] The chain 20 is pulled through an elongated hollow housing 25. The chain 20 exits the chain stopper through an opening 30 of the housing. The chain stopper 5 comprises a pair of trunnions 35, which connect the chain stopper 5 to table 40 (not shown in FIG. 1). The chain stopper 5 further comprises an engaging means 45 for adjusting a length and/or tension of the chain 20.

[0138] Referring to FIG. 2, there is shown a system 50 for mooring, tethering or anchoring of a structure 55, generally designated 50, according to an embodiment of the present invention. Like features are denoted by like numeral but incremented by a 300.

[0139] The system 50 comprises at least one device 60, such as a chain stopper 60, for connecting the chain 320 to a structure 55. The system 50 comprises a structure 55, which can be an offshore structure, marine structure, subsea structure, vessel or the like. Here, the structure 55 is in the form of a vessel 55 comprising a chain table 340, which can be rotatably connected to the vessel 55, e.g. to allow the vessel 55 to move or rotate relative to the chain table 340. It will be appreciated that in other examples the structure may be a buoy, floating platform or structure, or a subsea structure or the like. The system 50 can comprise the chain 320, such as a mooring, tethering or anchoring chain. It will be appreciated that in other examples, the device 60 may connect a line or wire or the like to the vessel 55. The chain 320 comprises a plurality of chain links. As can be seen in FIG. 2, a distal end or portion of the chain 320 can be moored or anchored to a seabed 65. A proximal end or portion of the chain 320 is connected to the chain table 340 of the vessel 55 by the device 60.

[0140] The device 60 is suitable for adjusting a length and/or tension of the chain or line 320 relative to the structure 55 or a portion thereof, such as the chain table 340. In use, adjusting a length of the chain 320 and/or tensioning of the chain 320 can be achieved by pulling, such as pulling-in, pulling substantially upwards and/or towards the vessel 55, or letting out or releasing of the chain 320.

[0141] In this example, the vessel 55 comprise a winch means 57, such as winch, jack, tensioner or the like, configured for pulling or letting out of the chain 320, thereby adjusting or controlling a length of the chain 320 and/or tension of the chain 320. As shown in FIG. 2, the winch means 57 is in communication with the device 60 so as to allow pulling-in or letting-out of the chain 320 or a portion thereof. The winch means 57 can actuate, such as hydraulically or electrically actuate, the device 60 to allow pulling-in or letting-out of the chain 320 or a portion thereof. It will be appreciated that in other examples a control means or controller may be provided, which may be in communication with the device and/or may be configure to actuate the winch means 57 and/or device 60.

[0142] In the example of FIG. 2, the device 60 is connected to the winch means 57 via a cable, line, hydraulic and/or electrical line, umbilical 59 or the like, so as to allow actuation.

[0143] Referring to FIG. 3, there is shown one or more device(s) 60, such as one or more chain stopper(s) 60, generally designated 60 according to an embodiment of the present invention. In this example, six devices 60 are arranged in three sets of two to connect the chain 320 to the chain table 340. It will be appreciated that in other examples, the arrangement of one or more devices 60 on the vessel 55 or chain table 340 may be varied. Alternatively or additionally the number of devices 60, connected to the chain table 340 or vessel 55 may be varied.

[0144] As can be seen in FIG. 4, the device 60 comprises a first portion 70 configured to be pivotably or rotatably connected or connectable to a vessel 55 so as to provide pivotal or rotational movement of the first portion 70 relative to a vessel 55 about or around a first axis 310 of the first portion 70. The first portion 70 comprises a chain guiding means 75 arranged on or in the first portion 70 for rotational movement about or around the first axis 310 of the first portion 70. Here the chain guiding means is in the form of a guide wheel. It will be appreciated that in other examples, the chain guiding means may include a sheave, fairlead wheel or cog wheel.

[0145] The device 60 comprises a second portion 80, which is in this example, pivotably or rotabaly connected to the first portion 70 to provide pivotal or rotational movement of the second portion 80 relative to the first portion 70. The second portion is pivotably or rotatably movable relative to the first portion 70 about or around a second axis 315 of the second portion 80. The device 60 comprises at least one means 85 for engaging the chain 320, which is arranged on or in the second portion 80. The engaging means 85 are connected to the second portion 80 to allow pivotal or rotational movement of the engaging means 85 relative to the second portion 80. In this example, the connection between the engaging means 85 and the second portion 80 is configured to limit or restrict the range of rotational movement of the engaging means 85 relative to the second portion 80.

[0146] In some examples, the engaging means 85 are connected to the second portion 80 to be rotatable or pivotable around or about a third axis 317 of the engaging means 85 and/or second portion 80. Here, the connection between the engaging means 85 and the second portion 80 and/or the device 60 is configured to simultaneously provide pivotal and slideable movement of the engaging means 85 about the third axis 317. By allowing pivotal or rotational movement of the engaging means 85 relative to the first and/or second portion, adjusting of a length and/or tensioning of the chain may be simplified.

[0147] Referring to FIG. 4, the first axis 310 and/or third axis is arranged so as to be oriented substantially perpendicular to the second axis 315 or vice versa.

[0148] The device 60 is suitable for adjusting a length and/or tension of the chain 320 relative to the vessel 55. The device 60 can be configured to connect, or attach, e.g. releasably connect or attach, the chain 320 to a vessel 55.

[0149] The first axis 310 comprises a substantially transverse first axis 310. The first axis 310 is arranged to be substantially perpendicular to a longitudinal or central 90 axis of the first portion 70 and/or device 60.

[0150] The second axis 315 is a substantially transverse second axis 310. The second axis is arranged to be substantially perpendicular to the longitudinal axis 90 of the first portion 70, second portion 80 and/or device 60.

[0151] As can be seen in FIG. 4, the first axis 310 and/or third axis 317 can be considered as extending in an x-direction. The second axis 315 can be considered as extending in a y-direction. The longitudinal axis 90 can be considered as extending in a z-direction.

[0152] The guide wheel 75 is pivotably or rotatably arranged on or in the first portion 70 for movement, such as rotational moment, about the first axis 310 of the first portion 70.

[0153] As can be seen in FIGS. 5 (a) and 5 (b), the second portion 80 comprises or defines a passage 95 through which the chain 320 can be run, threaded and/or pulled. In this example, the passage 95 is partially open so that the chain 320 contained therein is visible. By providing a partially open passage 95, the chain 320 may be visible, which may simplify inspection of the chain 320.

[0154] The second portion 80 comprises a first 100 and/or a second 105 opening for receiving the chain 320. The chain 320 exits or enters the second portion 80 at the first opening 100, which is arranged at or on the second portion 80, such as at a proximal end 102 of the second portion 80, as shown in FIG. 5 (a).

[0155] Alternatively or additionally the chain 320 exits or enters the second portion 80 at the second opening 105, which is arranged at or on the second portion 80, such as at a distal end 104 of the second portion 80.

[0156] Here, the means for engaging 85 of the chain 320 are arranged at the distal end 104 of the second portion 80. The engaging means 85 are configured to receive the chain 320. For example, the chain is pulled through, threaded through and/or directed through the engaging means 85. The engaging means 85 define or comprise the second opening 105 of the second portion 80.

[0157] In use, the chain 320 can have a slack or less tensioned portion 115 and a tensioned portion 110. In the example shown in FIG. 5(a), when no tension is applied at the proximal end 115a of the chain, the portion of chain 320 exiting or entering the first opening 100 of the second portion 80 may be slack or loose. Alternatively or additionally, when no tension is applied to the proximal end or portion 115a of the chain 320, the portion 110 of the chain 320 that enters the second opening 105 of the second portion 80, e.g. the distal end or portion 110a, may be tensed or be under tension, in use, due to the distal end or chain 110a being moored or anchored to the seabed 65.

[0158] As shown in FIGS. 5 (a), 6 and 7(a), the proximal end or portion 115a of the chain 320, which may be the less tensioned or slack portion 115, is disposed or arranged so as to pass below or under the first axis 310, second axis 315 and/or the guide wheel 75.

[0159] The proximal end or portion 115a of the chain 320 passes below or under the first axis 310, second axis 315 and/or guide wheel 75 so as to provide a clearance and/or space between the chain 320 and first 310 and/or second axis 315. By passing the proximal end or portion 115a of the chain 320 below or under the first axis 310, second axis 315 and/or guide wheel 75 to provide a clearance and/or space between the chain 320 and first 310 and/or second axis 315, catching of the chain 320 or a portion thereof on the first 310 and/or second axis 315 may be prevented. It will be appreciated that in examples where tension is applied to the proximal end or portion 115a of the chain 320, the proximal end or portion may also be disposed or arranged so as to pass below or under the first axis 310, second axis 315 and/or the guide wheel 75, as, for example shown in FIG. 7(a).

[0160] The guide wheel 75 guides the chain 320 about the first axis 310 offset or at distance 120 from the first axis 310. The offset or distance 120 can be defined between the first axis 310 and the chain engagement portion or point 125 of the guide wheel 75, e.g. a portion or point 125 of the guide wheel 75, which is in contact with the chain 320, as shown in FIG. 6.

[0161] Referring to FIG. 6, the proximal portion or end 115a of the chain 320, which may be the less tensioned or slack portion 115, e.g. when no tension is applied to the proximal end or region 115a of the chain 320, is disposed at an acute angle 130 to the longitudinal or central axis 90 of the device 60. As shown in FIG. 6, in use, in the first position of the engaging means 85, e.g. when no tension is applied to the proximal portion or end 115a of the chain 320, the proximal end or portion 115a of the chain 320 is in line with or coaxially arranged to the distal end or portion 110a of the chain 320.

[0162] It will be appreciated that in other examples where tension is applied to the proximal end or region 115a of the chain 320, e.g. as shown in FIG. 7 (a), the proximal end or portion of the chain 320 may be under tension and may also extend at the acute angle 130 relative to the central axis 90 of the device. In other words, the proximal end or portion 115a of the chain 320 may extend tangentially from the guide wheel 75, as shown in the examples of FIGS. 5 (a) to 7 (a).

[0163] In the examples of FIGS. 5 (a) and 6, the proximal end or portion 115a of the chain 320 exits or enters the second portion 80 at an acute angle 130 to the central or longitudinal axis 90 of the device 60. The acute angle can be defined by the offset or distance 120 and a further distance 135, as shown in FIG. 6. The further distance 135 is a distance or length 135 between the chain engagement portion or point 125 of the guide wheel 75 and engaging means 85 and/or second opening 105.

[0164] As described above, the engaging means is rotatable or pivotable relative to the second portion. For example, the engaging means 85 is rotatable or pivotal relative to the second portion 80 between a first position or configuration and a second position or configuration. Tension acting on the proximal end or portion 115a, e.g. by pulling-in of the chain 320, and/or the distal portion or end 110a of the chain can actuate or operate the engaging means 85 from the first position to the second position, or vice versa. The engaging means 85 may be in the first position, when no tension is applied to the proximal portion or end 115a of the chain 320, in use, as shown in the example of FIGS. 5 (a) and 6. In the first position of the engaging means 85, the distal end or portion 110a of the chain 320 enters or exits the second opening 105 at an angle 130a relative to the central axis 90, as shown in FIG. 6. In use, when tension is applied to the proximal end or portion 115a of the chain 320, for example by pulling-in of the chain 320, the engaging means rotates into the second position, which is shown in FIGS. 7(a) and (b). As can be seen in FIGS. 7 (a) and 7 (b), in the second position of the engaging means 85, the distal end or portion 110a is in line with or coaxially arranged to the central axis 90 of the first portion 70, second portion 80 and/or device 60. By providing a coaxial arrangement between the central axis of the device 60, first 70 and/or second portion 80 relative to the distal portion or end 110a of the chain 320, when tension is applied to the proximal end or portion of the chain 320, out of the plane (axis) bending or strain of the chain 320 may be prevented or eliminated. The coaxial arrangement may also allow the use of higher forces during pulling-in of the chain 320.

[0165] In the examples, of FIGS. 7 (a) and 7 (b), the chain 320 extends in a direction of the central or longitudinal axis 90 of the device, which perpendicularly intersects the first and/or second axes 310, 315 of the device, e.g. when tension is applied to the proximal end or portion 115a.

[0166] As shown in FIGS. 4 to 7 (b), the first axis 310 can be offset or spaced, such as offset or spaced along the longitudinal direction and/or longitudinal axis 90 of the device 60, from the second axis 315. For example, the first axis 310 can be provided at an end of the first portion 70 proximal to the vessel 55. The second axis 315 can be provided at a distal end of the first portion 70 and/or at an end of the second portion 80 proximal 102 to the first portion 70. Referring to FIG. 8, the first axis 310 defines or comprises a substantially horizontal axis 310. In other words, the first axis 310 may be provided in a horizontal plane, e.g. a substantially horizontal plane. By providing movement of the first portion 70 about the substantially horizontal axis 310 of the first portion 70, fabrication the device 60, apparatus or system 50 and/or attachment of the device 60 and/or first portion 70 to the vessel 55 may be simplified and/or weight of the device 60 or system 55 may be reduced.

[0167] The first axis 310 allows movement, such as rotational movement, of the first portion 70 relative to the vessel 55 and/or chain table 340 comprising at least one first degree of freedom. The second axis 315 allows movement, such as rotational movement, of the second portion 80 relative to the first portion 70 and/or a vessel 55 and/or chain table 340 comprising at least one second degree of freedom. The at least one first degree of freedom is substantially perpendicular to the at least second degree of freedom.

[0168] The first and second portions 70,80 of the device 60 and/or the first and second axes 310,315 allow movement, e.g. rotational movement, of the chain 320 relative to the vessel 55 comprising two or more degrees of freedom. By providing the device 60 with the first 310 and/or second axis 315, movement, e.g. rotational movement, of the chain 320 relative to a vessel 55 comprises two or more degrees of freedom. The first 70 and second 80 portions of the device 60 and/or the first 310 and second 315 axes allow movement, such as rotational movement, of the chain 320 relative to the vessel 55 in two or more directions and/or planes. The two planes and/or directions may be substantially perpendicular to one another.

[0169] In some examples, the device 60 can be configured to connect, or attach, such as releasably connect or attach, the chain 320 to the vessel 55.

[0170] The first portion 70 is attached or connected to a vessel 55 or chain table 340 via a first connection means 140. In this example, a proximal end of the first portion 70 is attached or connected to the vessel 55 via the first connection means 140. Here, the first connection means 140 provides rotational movement of the first portion 70 about the first axis 310. The first connection means 140 provides a connection, linkage or joint, which comprises at least one first degree of freedom.

[0171] The second portion 80 is attached or connected to the first portion 70 via a second connection means 145. In this example, the proximal end 102 of the second portion 80 is attached or connected to the distal end of the first portion 70 via the second connection means 145. The second connection means 145 can provide rotational movement of the second portion about the second axis 315. The second connection means 145 provides a further connection, linkage or joint, which comprise at least one second degree of freedom (for example FIG. 8).

[0172] The first 140 and/or second connection means 145 allow rotational movement of the chain 320 about the first 310 and/or second axis 315 (axes) of the first 70 and/or second portion 80 relative the vessel 55 and/or chain table 340. The first 140 and/or second connection 145 means provide movement, such as rotational movement, of the chain 320 in two or more planes and/or directions relative to the vessel 55 and/or chain table 340. By providing rotational movement of the chain 320 or line in two or more planes and/or direction, bending stresses, such as out of plane bending stresses, in the chain 320 may be minimised or prevented.

[0173] As can be seen in FIG. 8, the first connection means 140 comprise at least one first pin, protrusion or bolt 150.

[0174] Referring to FIGS. 8, 9 (a) and 9 (b), the first connection means 140 comprise first 155 and second apertures 160 carried by or provided on the end, such as the proximal end, of the first portion 70 for attachment to a vessel 55 and/or chain table 340. The first 155 and second apertures 160 can be opposite or and/or opposed to one another.

[0175] In this example, the vessel 55 and/or chain table 340 comprises first 165 and second attachment means 170, which can extend or protrude from the vessel 55 and/or chain table 340, as shown in the example of FIG. 8. The first 165 and second attachment means 170 comprise first 175 and second further apertures 180, respectively. In use, the first 155 and second apertures 160 of the first portion 70 are be aligned with the first 175 and second further apertures 180 of the first 165 and second attachment means 170. When aligned the at least one first pin 150 extends through the first 155 and second apertures 160 of the first portion 70 and the first 175 and second further apertures 180 of the first 165 and second attachment means 170, thereby connecting the first portion 70 to a vessel 55 and/or chain table 340.

[0176] As can be seen in the examples of FIGS. 8, 9 (a) and 9 (b), the first 155 and/or second apertures 160 of the first portion 70 and/or the first 175 and/or second further apertures 180 of the first 165 and second attachment means 170 are arranged or oriented substantially vertically, such as in a substantially vertical plane and/or direction, relative to the vessel 55 and/or chain table 340. By vertically orienting the first 155 and second apertures 160 of the first portion 70 and/or the first 175 and second further apertures 180, axial or thrust loads, which may act on a vessel 55, chain table 340 and/or the device 60, for example during pulling or tensioning of the chain 320 or caused by a weight of the chain 320, may be reduced.

[0177] In this example, the second connection means 145 comprise a third aperture 185 carried by or provided on the end, such as the distal end, of the first portion 70, as shown in FIG. 9 (a). It will be appreciated that in other examples, the first portion 70 may comprise more than one aperture. The second connection means 145 comprise a fourth 190 and/or fifth aperture (not shown) carried on or provided by the end, such as the proximal end 102, of the second portion 80. The second connection means 145 comprise at least one second pin, protrusion or bolt 195, which extends through the third 185, fourth 190 and/or fifth apertures, thereby connecting the second portion 80 to the first portion 70.

[0178] The first 140 and/or second connection means 145 define or comprise a connection arrangement 200, such as uni-joint or extended uni-joint arrangement 200.

[0179] Here, the first 140 and/or second connection means 145 define or comprise at least one first bearing and/or second bearing, such as at least one first low friction bearing and/or second low friction bearing, such as an Orkot bearing or non-metallic bearing.

[0180] The first 310 and/or second transverse axis 315 (axes) can be provided or defined by the at least one respective first pin 150 and/or the at least one respective second pin 195, which may act as one or more bearing shaft(s) of the first and/or second bearing (s).

[0181] As can be seen in the example of FIG. 8, the guide wheel 75 and the first axis 310, e.g. the first pin 150, are coaxially arranged. The guide wheel 75 can be arranged to guide the chain 320 around the first transverse axis 310. By arranging the guide wheel 75 and the first transverse axis 310 coaxially, loads and/or moments caused by, e.g. pulling or tensioning of the chain 320, and which may act on the device 60, may be reduced. A coaxial arrangement of the guide wheel 75 and the first transverse axis 310 may reduce or prevent movement of the chain 320 and/or device 60, e.g. first 70 and/or second portions 80, in a substantially vertical plane and/or direction during pulling and/or tensioning of the chain 320 relative to a vessel 55 and/or chain table. The guide wheel 75 is arranged so as to facilitate pulling (pulling-in) of the chain 320, e.g. for adjusting a length of the chain 320, tension of the chain 320 and/or changing the position of the vessel 55, in use. The guide wheel 75 comprises or defines one or more pockets, cogs or protrusions 76 for engaging with the chain 320. In this example, the guide wheel 75 comprises or defines five pockets, cogs or protrusions 76. It will be appreciated that in other example, the guide wheel 75 may comprise more or less than five pockets, cogs or protrusions. A radius of guide wheel 75 defines offset or distance 120, shown in the example of FIG. 6.

[0182] FIGS. 10(a) to 10(c) show an example of the engaging means 85. In the example of FIG. 10(a) the engaging means 85 are shown in the first position, whereas in the example of FIG. 10 (c), the engaging means are shown in a position between the first and second positions of the engaging means 85.

[0183] As described above, the connection between the engaging means 85 and the second portion 80 and/or device 60 is be configured to limit or restrict the range of rotational movement of the engaging means 85 relative to the second portion 80 and/or device 60. As shown in the example of FIGS. 10(a) to 10 (c), the engaging means 85 are pivotably connected to the second portion 80 at a first connection point or region 80a of the second portion 80 and slideably connected to the second portion 80 at a second point or region 80b of the second portion 80. As can be seen in FIGS. 10(a) to 10(c), the first point or region 80a can be arranged opposite the second point or region 80, such as width wise opposite.

[0184] An elongate member 86 in the form of a further pin, bolt or the like provides a pivotal connection between the engaging means and the second portion at the first point or region 80a of the second portion. The further pin 86 defines the third axis 317 of the engaging means 85.

[0185] A yet further elongate member 87 in the form of a yet further pin, bolt or the like extends through a pair of elongated slots 88 (one of the pair of slots is shown in FIGS. 10 (a) and 10 (c)) provided in the second portion 80, thereby slideably connecting the engaging means 85 to the second point or region 80b of the second portion 80.

[0186] In the example shown in FIG. 10 (a) the engaging means are in the second position, in which the yet further pin 87 abuts a second end 88b of the slot 88. When no tension is applied to the proximal end or region 115a of the chain 320, the engaging means may be in the first position, in which the yet further pin 87 abuts a first end 88a of the slot 88, as shown in the example of FIG. 5 (a). Alternatively, when no tensions is applied or the tension on the proximal portion or end 115a of the chain 320 increases, the engaging means may be in a position between the first and second positions, e.g. the yet further pin may be in a position between the first and second ends 88a, 88b of the slot 88, as shown in FIG. 10 (c).

[0187] Referring to FIGS. 10 (a) and 10 (b), the engaging means 85 define or comprise means 205 for adjusting of a length and/or tension of the chain 320, which may be connected or attached to the vessel 55 and/or chain table 340 by the device 60, as described above. In some examples, a position, such as an offshore position, of the vessel 55 can be altered and/or controlled by adjusting a length and/or tension of the chain 320 with respect to seabed 65 and/or the vessel 55.

[0188] The engaging means 85 can be configured to inhibit movement, such as movement in the longitudinal or axial direction 90 of the chain 320 and/or the device 90. For example, the engaging means 85 may be configured to restrain and/or lock any movement of the chain 320 in a first direction relative to the vessel 55, e.g. movement of the chain 320 in the direction of the longitudinal axis 90 of the device 60 towards a seabed 65. Alternatively or additionally, the engaging means 85 may be configured to allow movement of the chain 320 in a second direction relative to the vessel 55 and/or chain table 340, e.g. movement of the chain 320 in the direction of the longitudinal axis 90 of the device 60 towards the vessel 55 and/or chain table 340. In other words, the engaging means 85 may be configured to act as a ratchet or one-way ratchet, as will be described below.

[0189] Referring to FIGS. 10 (a) and 10 (b), the engaging means 85 are pivotably or rotatably arranged on or in the second portion 80 to allow movement, such as rotational movement, of the engaging means 85 with respect to the first 70 and/or second portion 80. By providing the engaging means 85 on a/the distal end 102 of the second portion 80 and/or allowing rotational or pivotal movement of the engaging means 85 relative to the first 70 and/or second portion 80, adjusting of a length and/or tension of the chain 320 may be simplified.

[0190] The engaging means 85 comprise an engaged 210 and/or a disengaged 215 configuration or position, as shown in the examples of FIGS. 10 (b) and 10 (c), respectively. In the engaged configuration 210, the engaging means inhibit movement of the chain 320 in one or more directions, such as along axial or longitudinal axis or direction 90 of first portion 70, second portion 90 and/or device 60. For example, in the engaged configuration the engaging means 85 restrain and/or lock (axial and/or longitudinal) movement of the chain 320 in the first direction (e.g. towards a seabed 65) relative to the first portion 70, second portion 80 and/or device 60.

[0191] In the disengaged configuration 315, the engaging means 85 allow movement of the chain 320 in one or more directions. For example, movement of the chain 320 is possible in the first and/or a second direction (e.g. towards the vessel 55 and/or the seabed 65). The engaging means 85 define or act as a ratchet 220, e.g. a one-way ratchet. By providing the second portion 80 with a ratchet 220 in the disengaged position 215, a length of the chain 320 and/or tension of the chain 320 may be adjusted and/or controlled. Alternatively or additionally, a position, such as an offshore position, of the vessel 55 may be altered and/or controlled by adjusting a length and/or tension of the chain 320.

[0192] Pulling, e.g. pulling-in or pulling substantially vertically upwards, of the chain 320 in the second direction (e.g. towards a vessel 55) actuates the engaging means 85 from the engaged 210 configuration into the disengaged configuration 215. Pulling, strain and/or tension acting in the first direction (e.g. towards a seabed) can actuate the engaging means 85 from the disengaged configuration into the engaged configuration. Alternatively or additionally, the engaging means 85 and/or device 60 is actuated, such as hydraulically or electrically actuated, from the engaged configuration 210 to the disengaged configuration 215, or vice versa. For example, the winch means 57 may be in communication with the engaging means 85 and/or device 60. The winch means 57 actuates, hydraulically or electrically actuates, the engaging means 85 from the engaged 210 to the disengaged configuration 215, or vice versa.

[0193] In some examples, the engaging means 85 can be connected to the winch means and/or the control means (not shown) via a cable, line, hydraulic and/or electrical line, umbilical 59 or the like, so as to allow actuation of the engaging means 85.

[0194] In use, the chain 320 is let out or released by actuating the engaging means 85 from the engaged configuration 210 to the disengaged configuration 215, e.g. by pulling of the chain 320 in the second direction or using an actuating means (not shown), and maintaining the engaging means 85 in the disengaged configuration 215, for example using the winch means, control means and/or a Remotely Operated Vehicle (ROV), while the chain 320 is let out or released.

[0195] In use, the chain 320 can be removed, maintained and/or exchanged from the engaging means 85 by actuating the engaging means into the disengaged configuration 215 using, for example a Remotely Operated Vehicle (ROV).

[0196] The engaging means 85 comprise or define a stopper member 225 mounted, e.g. pivotally mounted, so as to be actuateable between the engaged 210 and disengaged configuration 215 of the engaging means 85. The stopper member 225 is connected or fixed to the engaging means 85 via a hinged arrangement 230. The hinged arrangement 230 comprises a resilient member 235, such as a spring, which actuates the stopper member 225 in either the engaged 210 or disengaged configuration 215. In the engaged configuration 210 the stopper member 225 partially occludes the passage 95 of the second portion 80. The stopper member 225 comprises a slot or recess 240 for engaging with the chain 320 so as to prohibit movement of the chain 320 in the first direction. For example, the slot can be configured to allow passage of one or more chain links 321 of the chain 320, which are in alignment with the slot 340. The slot 240 can prevent passage of one or more chain links 322, which are in misalignment with the slot 240, shown in FIG. 10 (b).

[0197] One or more aligned chain links 321 are in a substantially parallel orientation relative to the slot 240. One or more misaligned chain links 322 are in a substantially perpendicular orientation relative to the slot 240. The chain may comprise a plurality and/or sequence of chain links 321,322, which are in alignment and/or misalignment with the slot 240. The slot or recess 240 of the stopper member 225 is arranged so as to provide a resolution of one or more chain links, e.g. a single and/or dual chain link resolution. The resolution of the stopper 225 member can be controlled by the shape of the slot or recess 240. For example, the shape of the slot 240 complements or matches a shape or profile of one or more aligned chain links to allow passage of one or more chain link. In some examples, the slot 240 comprises or defines a shape, such as a U-shape or the like, as shown in FIG. 10 (d). Alternatively or additionally, the stopper member 225 comprises a seat or support member 242 that is arranged on an edge or periphery of the slot or recess 240 (FIG. 10 (d)). In some example, the seat, support or guide can be spherical. In other example, the seat, support or guide can be oval, elliptical or the like.

[0198] One or more misaligned chain links 322 or an end thereof are supported by or rest against the seat or support member 242, in use. The shape of the seat or support member 242 matches or complements a shape or profile of one or more misaligned chain links 242.

[0199] In some examples, the second portion 80 may comprise one or more engaging means 85, as shown in FIG. 3. By providing the device 60 with one or more engaging means 85, such as two engaging means 85, single chain link resolution may be achieved. The one or more engaging means 85 are pivotably or rotatably mounted or arranged on or in the second portion 85. The one or more engaging means 85 are aligned along the longitudinal axis of the second portion 80 and/or the device 60.

[0200] In some examples, the one or more engaging means 85 can be spaced from another along the longitudinal axis 90 of the second portion 80 and/or device 90. Alternatively or additionally, the one or more engaging means 85 can be arranged adjacent to another along the longitudinal axis 90 of the second portion 80 and/or device 60.

[0201] Referring to FIGS. 11 (a) to 11 (d), the engaging means 85 comprise or define at least one guiding portion 245. The guiding portion 245 is configured to maintain and/or cause an orientation of the chain 320 while being run, threaded and/or pulled through the engaging means 85 and/or second portion 80. The guiding portion 245 comprises a first guiding aperture 250, which is positioned or located on a first end of the guiding portion 245 and/or engaging means 85. The guiding portion 245 comprises a second guiding aperture 255, which is positioned or located on a second end of the guiding portion. The first guiding aperture 250 is arranged opposite of the second guiding aperture 255. The first and second guiding apertures 250,255 comprise or define a shape or profile for ensuring the orientation of the chain 320. For example, the first and second guiding apertures 250, 255 can comprise or define a cruciform, clover leaf shape or the like.

[0202] It should be understood that the embodiments described herein are merely exemplary and that various modifications may be made thereto without departing from the scope of the invention.

[0203] For example, a structure may be an offshore structure, marine structure, platform, floating platform or a buoy or the like.

[0204] For example, the guiding means may comprise or define a bending shoe.

[0205] In the embodiments described hereinbefore, the chain may be a chain, line, wire, rope or the like.

[0206] For example, the first and second axes may coincide.

[0207] The device and/or engaging means may be in communication with a control means, which may be located on a structure or an onshore site. The control means may be a controller, controlling station, room or the like.

[0208] The winch means may comprise the control means.

[0209] The device and/or engaging means may be in wireless communication with the control means and/or winch means.

[0210] For example, the engaging means and/or device may comprise an actuating means for actuating the engaging means from the engaged configuration to the disengaged configuration, or vice versa. The actuating means may be a cylinder, piston or the like, e.g. a hydraulic cylinder or piston.

[0211] The actuating means may be integral with the device and/or engaging means.

[0212] A ROV may be used to actuate the engaging means from the engaged configuration to the disengaged configuration, or vice versa.

[0213] The device, apparatus and associated methods of the present invention may provide a means for connecting a chain to a structure and/or adjusting a length or tension of a chain connected to a structure.

[0214] The device and apparatus of the present invention may comprise a substantially horizontal axis. By providing movement of a first portion of the device about the substantially horizontal axis of the first portion, fabrication of the device and/or apparatus and/or attachment of the device and/or first portion to a structure may be simplified and/or weight of the apparatus may be reduced.

[0215] The device, apparatus or system and associated methods of the present invention may provide a first and/or second connection a means, which may allow rotational movement of a chain in two or more planes and/or directions relative to a structure. By providing rotational movement of the chain or line in two or more planes and/or direction, bending stresses, such as out of plane bending stresses, in the chain or line may be minimised or prevented.

[0216] The device, apparatus or system and associated methods of the present invention may provide a vertically orientation of the first and/or second apertures of a first portion and/or the first 90 and/or second further apertures of a first and second attachment means relative to a structure. By vertically orienting the first and second apertures of the first portion and/or the first and second further apertures, axial or thrust loads, which may act on a structure and/or the apparatus, for example during pulling or tensioning of a chain or caused by a weight of a chain, may be reduced.

[0217] The device, apparatus or system and associated methods of the present invention may guide a chain around the first transverse axis. By arranging the guiding means and the first transverse axis coaxially, loads and/or moments caused by, e.g. pulling or tensioning of a chain, and which may act on the apparatus, may be reduced. A coaxial arrangement of the guiding means and the first transverse axis may reduce or prevent movement of a chain and/or device, e.g. first and/or second portions, in a substantially vertical plane and/or direction during pulling and/or tensioning of a chain relative to a structure. The device, apparatus or system and associated methods of the present invention may provide a passage, which may be partially open so that a chain contained therein is visible. By providing a partially open passage, a chain may be visible in use, which may simplify inspection of a chain.

[0218] The device, apparatus or system and associated methods of the present invention may provide a clearance and/or space between a chain and a connection arrangement. By arranging the first opening to provide clearance or space between the connection arrangement and the chain, catching of the chain on the connection arrangement may be prevented, in use.