EP2817209B1 - Chain connector - Google Patents
Chain connector Download PDFInfo
- Publication number
- EP2817209B1 EP2817209B1 EP13704827.8A EP13704827A EP2817209B1 EP 2817209 B1 EP2817209 B1 EP 2817209B1 EP 13704827 A EP13704827 A EP 13704827A EP 2817209 B1 EP2817209 B1 EP 2817209B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- chain
- dog
- upper ends
- locking
- housing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Not-in-force
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
- B63B21/18—Stoppers for anchor chains
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Load-Engaging Elements For Cranes (AREA)
- Connector Housings Or Holding Contact Members (AREA)
- Farming Of Fish And Shellfish (AREA)
- Ship Loading And Unloading (AREA)
- Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
- Details Of Connecting Devices For Male And Female Coupling (AREA)
Description
- A vessel or other floating body is commonly moored to the sea floor by a chain that passes though a chain connector on the floating body and down to the sea floor. Although a few chains may be used to moor the vessel, the tension in each chain may be very high, such as 2000 tons. Previously, tension in the chain had to be reduced before the chain could be disconnected, and large forces were required. The force required to disconnect the chain while it is under tension, should be moderate. Also, the chain connector should be of moderate size. A chain connector of moderate size that allowed emergency disconnection of a chain using only a moderate force, such as no more than 5% of the chain tension for the disconnection, would be of value.
- Document
US 5 809 925 discloses a chain connector. - In accordance with one embodiment of the invention, a chain connector is provided that holds a chain that may be subjected to a very high tension such as 2000 tons, and that allows the chain to be disconnected from a floating body or the like by applying only a moderate release force such 50 tons. The chain extends though a housing and one of its chain links is supported by ratchets. The ratchets are mounted on first levers in the form of arms that have upper ends pivotally connected to the chain connector housing and that have free lower ends. The chain connector also has a pair of second levers, or locking dogs, that have lower ends forming cams that hold or release the arm lower ends. The locking dogs have upper ends that are held together by pins. When the pins are raised, they release the locking dog upper ends. This allows the locking dog upper ends to move apart, so the cams on the locking dog lower ends release the arms to pivot apart and release the ratchets to release the chain.
- The ratchets are pivotally supported on the arms. The ratchets have concave upper ends that receive the convex lower ends of alternate chain links, to distribute the load.
- The novel features of the invention are set forth with particularity in the appended claims. The invention will be best understood from the following description when read in conjunction with the accompanying drawings.
-
-
Fig. 1 is an isometric view of a chain connector, with an unsupported chain extending though a passage therein. -
Fig. 2 is an isometric view of the chain connector ofFig. 1 , with an upper part of the housing removed for clarity and with the chain supported. -
Fig. 3 is a sectional side view of the chain connector ofFig. 1 with the left side ofFig. 3 taken on a centerline of the connector and the right side taken from in front of the locking dogs. -
Fig. 4 is a front elevation view of the chain connector ofFig. 3 . -
Fig. 5 is a side view of the chain connector ofFig. 4 . -
Fig. 1 shows a chain connector 10 of the invention, which has apassage 12 though which a chain 14 usually extends. The chain connector 10 is usually mounted on a floating body such as a vessel, with the chain extending down to the sea floor and anchored thereat to limit drift of the vessel. However, the chain is useful in a variety of applications. Occasionally, the chain must be disconnected from the chain connector, as to allow the replacement of a mooring leg, maintenance, or to allow the vessel to drift or sail away from its moored location. In that case, the chain may be under a high tension such as 2000 tons. The present chain connector is designed to disconnect the tensioned chain from the chain connector using only a moderate force such as 10% of the chain tension for a chain connector of moderate length. -
Fig. 3 shows that the chain is supported byupper ends 22 ofratchets axes arms upper ends 35 pivotally mounted on thechain connector housing 38, aboutaxes lower ends 44 that are prevented from moving away from aconnector axis 46 bycams 50 that are formed on lockingdogs 52, 54 (Fig. 1 ). The locking dogs each has a lower end that forms acam 50 and has anupper end 60. When apin 56,58 is moved up and away from theupper ends 60 of the locking dogs, then the locking dog upper ends are free to move apart, to the positions shown inFig. 1 . As the locking dogs move apart, theircams 50 release thearms Fig. 1 , moves theratchets housing passage 12. - The disconnection process is performed by energizing an activating device, preferably an hydraulic jack 70 (
Fig. 1 ) which has acylinder 72 mounted on the housing and apiston 74 that can be forcefully moved up. The upper end of the piston holds twopins 58. As shown inFig. 3 , eachpin 58, lies against theupper end 60 of one of the lockingdogs - The combinations of arms and locking dogs enable the chain to be released by using only a moderate force such as an upward force of 50 tons applied by the
jack 70. Instead of using thearms dogs - The housing has a center plane 90 (
Fig. 5 ) and the chain has aligned links such as 92 that are widest along the center plane and has alternate perpendicular links such as 94 that are widest along a plane that is perpendicular to the center plane. The ratchets (Fig. 3 ) have concaveupper faces 95 that are curved about two axes to distribute the downward force of a chain link over a wide area. The ratchets engage only the alignedlinks 92. The ratchets are pivoted to move against and away from the chain by thealigned chain links 92 pushing below the ratchets when pulling on the chain.Levers 102 that engagehousing surface 104, are pivotally mounted on the arms and help control arm position. - Thus, the invention provides a chain connector that enables its disconnection from a chain that is under a high tension (on the order of magnitude of 2000 tons), by applying only a moderate force that is less than 10% and preferably less than 5% of the chain tension. The chain connector includes ratchets mounted on arms that have upper ends pivotally mounted on the control housing. The lower ends of the arms are held against pivoting apart by cams that are located on locking dogs. The locking dogs have upper ends that are held close to the housing axis by pins on a jack. The jack can be operated to raise the pins out of engagement with the locking dogs to allow the arms and dogs to pivot apart and thereby release the chain.
- Thus, the invention provides a chain connector of moderate size, which can disconnect from a chain while the chain is under high tension. The connector includes arms with upper ends that are pivotally mounted on the housing and with free lower arm ends. The connector also includes locking dogs with lower ends that are pivotally mounted on the housing and with free upper ends. The lower ends of the locking dogs form cams that release the arm free lower ends to pivot apart when the dog upper ends are released to move apart. Ratchets that engage the links have upper faces that are curved about two perpendicular axes to provide large area engagement with the links.
- Although particular embodiments of the invention have been described and illustrated herein, it is recognized that modifications and variations may readily occur to those skilled in the art, and consequently, it is intended that the claims be interpreted to cover such modifications and equivalents.
Claims (3)
- A chain connector comprising:a housing (36) that has at least a partially vertical chain passage (12) through which a chain extends;a pair of arms (34, 36) each having an upper end (34) pivotally mounted on said housing about a different arm axis (40, 42), each arm having a lower end (44);a pair of ratchets (24, 26) each coupled to one of said arms, said ratchets each being engageable with said chain to support the chain and each ratchet being disengageable from said chain to release it;a pair of locking dogs (52, 54), each having a lower end pivotally mounted on said housing and each dog having a free upper end (60), each dog forming a cam (50) that engages the lower end (44) of one of said arms so when the dog upper ends (60) are released to move apart they release the arm lower ends (44) to move apart;an activation device (70) mounted on said housing, said device having a pair of pins (58) that each engages one of said locking dog upper ends (60) to prevent said locking dog upper ends (60) from pivoting apart, said activation device (44) being moveable to release said locking dog upper ends (60).
- The chain connector described in claim 1 wherein:said body has a center plane (90) and said locking dogs (52, 54) move in said center plane (90) when said dogs (52, 54) pivot, and said chain has alternate aligned links (92) and perpendicular links (95); when the chain connector is in use with the chain,a portion of said chain that lies in said chain passage has aligned links that lie in said center plane;each of said ratchets has a concave chain-engaging surface (94) that is curved to make area contact with the lower end of one of said aligned links.
- The chain connector described in claim 1 wherein:said activation device includes a hydraulic cylinder (72) mounted on said housing below the height of said locking dog free upper ends, and a piston (74) having a lower portion lying in said cylinder and a vertically slideable upper end, said piston upper end carrying a pair of pins (58) that each lies against one of said dog upper ends (60) when said locking dogs are not pivoted apart, to prevent said locking dogs from pivoting apart until said pins are raised.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201261601331P | 2012-02-21 | 2012-02-21 | |
US13/718,702 US8820258B2 (en) | 2012-12-18 | 2012-12-18 | Chain connector |
PCT/IB2013/000082 WO2013124717A1 (en) | 2012-02-21 | 2013-01-23 | Chain connector |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2817209A1 EP2817209A1 (en) | 2014-12-31 |
EP2817209B1 true EP2817209B1 (en) | 2016-04-20 |
Family
ID=47722333
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13704827.8A Not-in-force EP2817209B1 (en) | 2012-02-21 | 2013-01-23 | Chain connector |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2817209B1 (en) |
CA (1) | CA2865128C (en) |
RU (1) | RU2617878C2 (en) |
WO (1) | WO2013124717A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8820258B2 (en) * | 2012-12-18 | 2014-09-02 | Single Buoy Moorings, Inc | Chain connector |
RU2647826C1 (en) * | 2014-06-12 | 2018-03-19 | Блюуотер Энерджи Сёвисиз Б.В. | Chain stopper device and chain and chain stopper used in it |
NO339306B1 (en) * | 2015-05-04 | 2016-11-21 | Scana Offshore Vestby As | Mooring arrangment and a chain stopper assembly |
WO2016180866A1 (en) | 2015-05-12 | 2016-11-17 | Single Buoy Moorings Inc. | Mooring line connector assembly for connecting a mooring line to a floating structure |
DK3313721T3 (en) | 2015-06-26 | 2019-05-27 | Single Buoy Moorings | Liquid wind turbine device, as well as a method for mooring such a floating wind turbine device |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SU70504A1 (en) * | 1947-03-13 | 1947-11-30 | Н.К. Кочетов | Stopper for traction chains, predominantly core |
US3289626A (en) * | 1965-08-19 | 1966-12-06 | Mcdermott & Co J Ray | Chain stoppers |
US3859946A (en) * | 1973-04-19 | 1975-01-14 | Peter G Hammerschlag | Under load releasable chain stoppers |
SU1118579A1 (en) * | 1982-04-09 | 1984-10-15 | Предприятие П/Я А-3780 | Device for securing and casting anchor chain bitter end |
US5809925A (en) * | 1997-07-30 | 1998-09-22 | Smith Berger Marine, Inc. | Chain stopper |
-
2013
- 2013-01-23 EP EP13704827.8A patent/EP2817209B1/en not_active Not-in-force
- 2013-01-23 RU RU2014138018A patent/RU2617878C2/en not_active IP Right Cessation
- 2013-01-23 WO PCT/IB2013/000082 patent/WO2013124717A1/en active Application Filing
- 2013-01-23 CA CA2865128A patent/CA2865128C/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
RU2617878C2 (en) | 2017-04-28 |
WO2013124717A1 (en) | 2013-08-29 |
CA2865128C (en) | 2019-07-02 |
RU2014138018A (en) | 2016-04-10 |
CA2865128A1 (en) | 2013-08-29 |
EP2817209A1 (en) | 2014-12-31 |
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