US3590408A - Anchoring device for a floating buoy - Google Patents

Anchoring device for a floating buoy Download PDF

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Publication number
US3590408A
US3590408A US801849A US3590408DA US3590408A US 3590408 A US3590408 A US 3590408A US 801849 A US801849 A US 801849A US 3590408D A US3590408D A US 3590408DA US 3590408 A US3590408 A US 3590408A
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US
United States
Prior art keywords
buoy
percent
anchoring device
anchoring
cable
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.)
Expired - Lifetime
Application number
US801849A
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English (en)
Inventor
Cornelis M Verhagen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Datawell BV
Original Assignee
Datawell BV
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Filing date
Publication date
Application filed by Datawell BV filed Critical Datawell BV
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Publication of US3590408A publication Critical patent/US3590408A/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B22/00—Buoys
    • B63B22/18—Buoys having means to control attitude or position, e.g. reaction surfaces or tether
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/06—Extensible conductors or cables, e.g. self-coiling cords
    • 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
    • B63B2021/003—Mooring or anchoring equipment, not otherwise provided for
    • B63B2021/005—Resilient passive elements to be placed in line with mooring or towing chains, or line connections, e.g. dampers or springs

Definitions

  • the invention relates to an anchoring means for connecting a buoy with a fixed point below the water surface, which anchoring means contains at least over part ofits length an elongated elastic member that can be elongated over 100 percent and consists of natural rubber mixed with polybutadiene and/or a plasticizer, and is able to withstand at least 30,000 elongations of more than 100 percent without tearing or breaking.
  • the anchorage means according to the invention enables the use of smaller buoys that nevertheless are not submerged by current and waves.
  • the invention relates likewise to a floating buoyanchored by such a device.
  • a further disadvantage of the tug is that it forms a heavy loading for the cable and the anchorage, so that these have to be constructed heavily.
  • the invention solves the above mentioned difficulties and provides an anchorage for a floating buoy with which also when it is anchored in streaming, shallow water and when high waves can occur, there is no danger that the buoy is submerged. According to the invention this is obtained by the fact that the anchoring means, for at least part of its length, consists of an elastic material with a relative elongation of at least percent.
  • the materials which can be used according to the invention can be indicated as to be rubberlike materials, with an admissible relative elongation of at least 100 percent.
  • the elongation is that elongation which may occur without rupturing the material. With this it has to be thought of the fact that with anchoring buoys the elongation is continuously variable, so that the admissible elongation is that with which also no fatigue breakdown occurs.
  • the modulus of elasticity of the material is smaller than 25 kg./cm.”
  • rubberlike materials have been found with a modulus of elasticity between 3 and 25 kg./cm. at 100 percent elongation and an advisable elongation of at least 100 percent without the possibility of fatigue breakdown. These materials are natural and artificial rubbers.
  • the length of the anchoring means highly depends on the depth.
  • the maximum wave height increases only very little with depths of more than 15 m., so that with increasing depths the ratio between the wave height and the length of the connecting means becomes gradually favorable.'With a depth of 1000 n. the wave height is so small in view of the mooring cable, that an elongation of the anchoring cable equaling 0.5 percent of the length of the cable is sufficient.
  • Nonrubberlike materials are known which can easily stand such an elongation without any chance of fatigue breakdown, so that in this case the invention hardly yields any profit.
  • the depth decreases so that the wave height forms a larger percentage of the length of the connecting means, the advantages of the invention come forward.
  • the anchorage according to the invention it is possible by using the anchorage according to the invention to have a buoy, with a volume of 0.16 m. and a loading without the anchorage of 60 percent, not submerged, in
  • the rubberlike material being employed may not show much creep in case of possible low temperatures (in practice to about C.). Large creep (150 up to 250 percent of the original length) especially occurs with pure natural rubbers, mainly in consequence of the so-called crystallization. Pure polybutadiene rubbers indeed do not show crystallization, but have a small tear strength. Adding styrene and carbon-black to polybutadiene rubbers (SBR) gives a far better tear strength, but in that case fatigue breakdown may occur already relatively quick with low stresses.
  • SBR polybutadiene rubbers
  • a suitable rubber for applying with the invention appears to be a natural rubber filled with carbon-black and mixed with polybutadiene and/or plasticizer.
  • the elastic portion of the connecting means may have nearly any sectional shape.
  • a solid execution will be preferred, but it will be obvious that also other shapes can be applied, e.g. thick walled tubes.
  • this liquid is electrical conducting and at the outer ends of the tube electrodes are provided which are in contact with this liquid, a reliable electrical connection may be obtained.
  • the elastic connecting means is that it is a cable of rubberlike material, which is formed from a number of cords.
  • the advantage of this is that a possible rupture by tearing is limited to one cord of the cable.
  • the elastic part of the connecting means according to the invention has an acceptable elongation of at least 100 percent, generally speaking a given length of this part will suffice, this length being about equal to the maximum wave height which can be expected. As this does not increase with increasing depth of the water, the further connecting means may be executed as little or not elastic, such as a cord of steel or plastic.
  • the invention also relates to an anchoring means as described above.
  • FIG. 1 is a perspective view of one embodiment of the anchoring device for a floating buoy.
  • FIG. 2 is a cross-sectional view of the connection between the cable which is attached to a fixed anchoring device and the rubber tube which is attached to a buoy.
  • the anchoring device is submerged in a stream and is attachable to a buoy generally designated by the numeral 1.
  • a rubber tube 2 Connected to buoy l at its submerged portion is a rubber tube 2 which, as mentioned above, is preferably hollow and formed of a natural rubber mixed with polybutadiene and/or a plasticizer and has an acceptable elongation of at least I00 percent.
  • rubber tube 2 can be filled with a liquid 3, which is. preferably of the electrical conducting variety.
  • Cable 4 at one end is connected to rubber tube 2 at connecting point 5 and may be clamped thereto by any suitable clamping means.
  • the other end of cable 4 is connected to fixed anchor 6 for maintaining buoy l in a generally fixed location in the stream.
  • connecting point 5 includes an electrode 7, one end of which is in contact with conductive liquid 3 for providing a reliable electrical connection with electrical instruments contained in buoy 1.
  • the lower end of rubber tube 2 fits in telescopic relation over the terminal end of cable 4 and may be clamped thereto by any suitable clamping means to form a liquid-tight connection.
  • An anchoring device for a floating measuring buoy in which an elongated flexible connecting member connects the buoy with a fixed point below the water surface, character zed in that at least part of the length of the connecting member consists of an elastic material with a relative elongation of at least percent and is formed as a tube of rubberlike material which is filled with an electrically conducting liquid, and electrodes provided near the ends of the tube, which electrodes are in contact with the said liquid.
  • Anchoring device characterized in that the rubberlike material is a natural rubber compound to which polybutadiene has been added.
  • Anchoring device characterized in that the rubberlike material is a natural rubber compound to which polybutadiene plus plasticizer has been added.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Laying Of Electric Cables Or Lines Outside (AREA)
  • Inert Electrodes (AREA)
US801849A 1968-03-01 1969-02-24 Anchoring device for a floating buoy Expired - Lifetime US3590408A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6803005A NL6803005A (da) 1968-03-01 1968-03-01

Publications (1)

Publication Number Publication Date
US3590408A true US3590408A (en) 1971-07-06

Family

ID=19802922

Family Applications (1)

Application Number Title Priority Date Filing Date
US801849A Expired - Lifetime US3590408A (en) 1968-03-01 1969-02-24 Anchoring device for a floating buoy

Country Status (5)

Country Link
US (1) US3590408A (da)
DE (1) DE1909117C3 (da)
FR (1) FR2003080A1 (da)
GB (1) GB1208457A (da)
NL (1) NL6803005A (da)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3728748A (en) * 1970-11-27 1973-04-24 Us Navy Mooring apparatus
US3742535A (en) * 1971-03-31 1973-07-03 Bendix Corp Open ocean shallow water moor
US3819850A (en) * 1972-12-26 1974-06-25 Ite Imperial Corp Conductive expansion joint for electrical transmission system
US6685518B1 (en) 2002-10-24 2004-02-03 Massachusetts Institute Of Technology Buoyant device that resists entanglement by whales and boats
US7244155B1 (en) 2006-08-21 2007-07-17 Cortland Cable Company, Inc. Mooring line for an oceanographic buoy system
US20090269709A1 (en) * 2008-04-28 2009-10-29 Her Majesty In Right Of Canada As Represented By The Minister Of Fisheries And Oceans Communication float
US20110183556A1 (en) * 2010-01-22 2011-07-28 Skysight Technologies Llc Scoop Point Buoy
US20110183555A1 (en) * 2010-01-22 2011-07-28 Skysight Technologies Llc Fishing Trawler Net Resistant Subsurface Buoy Tether System

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE424708B (sv) * 1977-06-27 1982-08-09 Socared Sa Elastlina

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3101491A (en) * 1961-09-28 1963-08-27 Eric A Salo Mooring device
US3419702A (en) * 1966-02-28 1968-12-31 Michel F. Piel Garment with electrically conductive heating element
US3423777A (en) * 1966-11-10 1969-01-28 Eg & G Inc Buoy apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3101491A (en) * 1961-09-28 1963-08-27 Eric A Salo Mooring device
US3419702A (en) * 1966-02-28 1968-12-31 Michel F. Piel Garment with electrically conductive heating element
US3423777A (en) * 1966-11-10 1969-01-28 Eg & G Inc Buoy apparatus

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3728748A (en) * 1970-11-27 1973-04-24 Us Navy Mooring apparatus
US3742535A (en) * 1971-03-31 1973-07-03 Bendix Corp Open ocean shallow water moor
US3819850A (en) * 1972-12-26 1974-06-25 Ite Imperial Corp Conductive expansion joint for electrical transmission system
US6685518B1 (en) 2002-10-24 2004-02-03 Massachusetts Institute Of Technology Buoyant device that resists entanglement by whales and boats
US7244155B1 (en) 2006-08-21 2007-07-17 Cortland Cable Company, Inc. Mooring line for an oceanographic buoy system
US20090269709A1 (en) * 2008-04-28 2009-10-29 Her Majesty In Right Of Canada As Represented By The Minister Of Fisheries And Oceans Communication float
US7874886B2 (en) * 2008-04-28 2011-01-25 Her Majesty in the right of Canada as represented by the Department of Fisheries and Oceans Communication float
US20110183556A1 (en) * 2010-01-22 2011-07-28 Skysight Technologies Llc Scoop Point Buoy
US20110183555A1 (en) * 2010-01-22 2011-07-28 Skysight Technologies Llc Fishing Trawler Net Resistant Subsurface Buoy Tether System
US8177596B2 (en) * 2010-01-22 2012-05-15 Skysight Technologies Llc Fishing trawler net resistant subsurface buoy tether system
US8177595B2 (en) * 2010-01-22 2012-05-15 Skysight Technologies Llc Scoop point buoy

Also Published As

Publication number Publication date
DE1909117C3 (de) 1978-11-30
DE1909117B2 (de) 1978-04-06
NL6803005A (da) 1969-09-03
FR2003080A1 (da) 1969-11-07
GB1208457A (en) 1970-10-14
DE1909117A1 (de) 1970-04-23

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