WO1997029302A1 - Spooling block device - Google Patents

Spooling block device Download PDF

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Publication number
WO1997029302A1
WO1997029302A1 PCT/IB1997/000156 IB9700156W WO9729302A1 WO 1997029302 A1 WO1997029302 A1 WO 1997029302A1 IB 9700156 W IB9700156 W IB 9700156W WO 9729302 A1 WO9729302 A1 WO 9729302A1
Authority
WO
WIPO (PCT)
Prior art keywords
belt
slide plate
spooling
block device
links
Prior art date
Application number
PCT/IB1997/000156
Other languages
French (fr)
Inventor
Martin Howlid
Original Assignee
Geco A/S
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Geco A/S filed Critical Geco A/S
Priority to AU16157/97A priority Critical patent/AU1615797A/en
Publication of WO1997029302A1 publication Critical patent/WO1997029302A1/en

Links

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
    • B63B21/04—Fastening or guiding equipment for chains, ropes, hawsers, or the like
    • B63B21/10—Fairleads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/18—Means for guiding or supporting belts, ropes, or chains

Definitions

  • the invention concerns a reel block device, especially for seismic cables.
  • the cables When handling cables of a number of different types on board a vessel, the cables often have to be deployed or recovered, generally from a cable drum or a similar spooling device. In connection with the handling of the cable it may be necessary to guide it in such a manner that the cable is bent. Cable producers therefore specify a minimum bending diameter which is dependent on the cable's diameter and internal geometry. For seismic cables, for example, these bending diameters are specified as approximately 1-2 m.
  • a cable drum is employed which is provided below deck, while on deck there are provided one or more spooling blocks in order to guide the cable during deployment or recovery.
  • these spooling blocks have a diameter of approximately 1-2 m and are correspondingly heavy and space-consuming.
  • the object of the present invention is therefore to avoid the problems which arise when using standard spooling blocks for handling cables such as seismic cables during deployment and recovery. More specifically, the object is to reduce the space requirements of the spooling block and make it easier to handle.
  • a spooling block device which comprises an endless, articulated belt formed by a number of links hinged together and a guide for the belt in the form of an upwardly curved slide plate which is convex in the longitudinal direction, wherein a section of the belt is mounted above the slide plate in its longitudinal direction and arranged to be guided over the slide plate in sliding abutment against it, in such a manner that the mounted section of the belt assumes substantially the same radius of curvature as the slide plate, while the belt outside the ends of the slide plate forms a substantially freely downwardly hanging curve, and wherein on the external surface of the belt and in the individual links of the belt there is provided a groove to receive a cable which has to be spooled, with the result that during spooling the belt guides the cable and moves together with it.
  • the radius of curvature of the slide plate in such a manner that, when the belt is being guided, the section of the belt mounted on the slide plate approximately corresponds to a part of a circular arc. Furthermore it is advantageous for the groove to be curved either in the longitudinal direction or in the cross direction of the belt or in both directions, with the result that the groove becomes doubly curved.
  • each of the links is designed as a slide plate which is guided on the slide plate in sliding abutment against it.
  • the spooling block device comprises a side guide on each side and connected to the sliding surface, and that at least a part of each of the lateral surfaces on each of the links is designed as a sliding surface which is guided on the respective side guide in sliding abutment against it.
  • the slide plate there is preferably provided a bottom plate, thus causing the external surface or the downwardly hanging section of the belt to be guided over the bottom plate and to be partially supported in abutment against it.
  • slide plate and the bottom plate are connected via respective side plates, and that the side plates simultaneously form the said side guides.
  • Figure 1 shows a spooling block device according to the invention viewed from one end
  • Figure 2 is a sectional elevation through the spooling block device in Figure 1 , taken along line A- A;
  • Figure 3 shows the spooling block device of Figure 1 in a ready mounted state
  • Figure 4 shows the spooling block device of Figure 3 viewed from above.
  • Figure 5 is a perspective view of the ready mounted spooling block device.
  • spooling block device for use on board a vessel and arranged for handling seismic cables. It should be understood, however, that the invention can also be applied in other situations and with other types of cable than seismic cables.
  • the spooling block device is viewed from in front in Figure 1. It simulates the diameter of a large spooling block or spooling wheel by forming a belt 1 consisting of a number of small, curved parts la in the form of links hinged together. These curved parts or links la have a bottom surface or underside with low friction and are best illustrated in Figure 2, arranged to slide on a curved surface formed by an upwardly curved slide plate 2 which is convex in the longitudinal direction.
  • the radius of curvature of the slide plate preferably corresponds to the radius of a circle, in which case the links la, which are hinged together to form an endless belt when guided on the slide plate 2, approximately correspond to a part of a circular arc.
  • the angle of this arc on the slide plate may be 180 degrees or less.
  • the hinged links la enable the belt 1 to be turned back when the slide plate is passed and the belt will therefore form a substantially freely downwardly hanging curve below the slide plate, for example a chain curve.
  • the freely downwardly hanging curve again reaches the end of the slide plate 2
  • the belt is bent forward, once again due to the hinges between the individual links la, and the belt with links mounted on the slide plate continues along it with the desired radius of curvature.
  • the section of the belt 1 which is located on the slide plate 2 forms only a small part of the whole circular arc in a large spooling wheel with the same radius as the radius of curvature for the mounted part of the belt, thereby giving the spooling block device according to the invention much smaller dimensions than a corresponding, standard spooling wheel.
  • each of the links la in the belt 1 has a male hinge on one end and a female hinge on the other end, thus enabling them to be easily hinged together and connected as an endless belt.
  • the belt On the underside of the slide plate 2 the belt is guided in a freely suspended curve, but in this curve section the belt can also come into sliding abutment against a bottom plate 3 over a part of its length, as indicated in Figure 2, or over its whole length. Parts of the surface of the belt and links beside the groove lb are advantageously made of the same low friction material as the underside of the belt 1.
  • the belt 1 , the slide plate and the bottom plate 3 in the spooling block device according to the invention are illustrated for example in Figures 3,4 and 5 mounted in a frame, preferably formed by two side plates 4a, b which are attached between legs 5a,b in a yoke 5, the legs being connected by a crossbeam 5c.
  • the side plates 4a,b form side guides for the belt 1 , and consequently the lateral surfaces on each of the links la are preferably equipped with sliding surfaces which are guided on the side plates in sliding abutment against them. At the same time the side guides or the side plates 4a, b protect the belt 1 against damage and also provide increased safety for the handling personnel.
  • the shackle 6 will transfer the load from the cable and the spooling block device to the aforementioned lifting device for the spooling block.
  • the spooling block device can be mounted freely suspended, for example, in the aforementioned lifting device or it can be mounted in a fixed frame (not shown) mounted on the deck of the vessel.
  • the spooling block device When a seismic cable has to be deployed or recovered the spooling block device according to the invention is placed at the desired location, for example the afterdeck of the vessel, and the cable is guided in the groove lb in the belt 1, while at the same time the belt moves with the cable. The cable is thereby protected against wear which can occur due to sliding against a surface. At the same time the curvature of the spooling block enables the cable to be deployed or recovered with the correct minimum bending diameter according to the specification for the cable concerned.
  • the actual cable drum can be placed in the hold on the vessel.
  • An additional advantage of the spooling block device of the invention is that by virtue of its use of the sliding belt 1 on the slide plate 2, the load represented by the cable is spread over the relatively larger area of the slide plate, permitting the use of relatively lightweight and low cost plastics materials for the links la.
  • the belt 1 With regard to the actual belt 1 , it will be obvious to a person skilled in the art that it can be designed in different ways within the scope of the invention.
  • raised sections can be provided on the side of the groove lb on the top as well as the bottom of the links la and possibly also on the side of the links in order to form slide guides which, during cable handling and movement of the belt, come into sliding abutment against the slide plate 2, the bottom plate 3 or the side plates 4a,b respectively.
  • the links la are preferably made of a suitable low friction material, for example a polymer material.
  • the spooling block device forms a particularly well suited device for deploying and recovering cables from the afterdeck of a vessel, where the space requirements are crucial.
  • the cable is given the same bending diameter as for a corresponding spooling wheel, thus enabling the cable to be guided to and from, for example, a cable drum provided in the ship's hold without incurring any damage during deployment and recovery.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Guides For Winding Or Rewinding, Or Guides For Filamentary Materials (AREA)

Abstract

A spooling block device, especially for seismic cables, comprises an endless, articulated belt (1) formed by a number of hinged together links (1a) and a guide for the belt in the form of an upwardly curved slide plate (2) which is convex in the longitudinal direction. A section of the belt is mounted above the slide plate (2) in its longitudinal direction and arranged to be guided over the slide plate in sliding abutment against it, with the result that the mounted section of the belt assumes substantially the same radius of curvature as the slide plate, while the belt (1) outside the ends of the slide plate forms a substantially freely downwardly hanging curve. On the external surface of the belt and in the individual links (1a) of the belt there is provided a groove (1b) for receiving a cable which has to be spooled, with the result that, during spooling, the belt guides the cable and moves together with it. The device is specially applied in the deployment and recovery of seismic cables from the deck of a vessel.

Description

SPOOLING BLOCK DEVICE
The invention concerns a reel block device, especially for seismic cables.
When handling cables of a number of different types on board a vessel, the cables often have to be deployed or recovered, generally from a cable drum or a similar spooling device. In connection with the handling of the cable it may be necessary to guide it in such a manner that the cable is bent. Cable producers therefore specify a minimum bending diameter which is dependent on the cable's diameter and internal geometry. For seismic cables, for example, these bending diameters are specified as approximately 1-2 m. During deployment and recovery of seismic cables from a vessel, for example, a cable drum is employed which is provided below deck, while on deck there are provided one or more spooling blocks in order to guide the cable during deployment or recovery. Thus these spooling blocks have a diameter of approximately 1-2 m and are correspondingly heavy and space-consuming.
The object of the present invention is therefore to avoid the problems which arise when using standard spooling blocks for handling cables such as seismic cables during deployment and recovery. More specifically, the object is to reduce the space requirements of the spooling block and make it easier to handle.
The above-mentioned objects are achieved according to the invention by providing a spooling block device which comprises an endless, articulated belt formed by a number of links hinged together and a guide for the belt in the form of an upwardly curved slide plate which is convex in the longitudinal direction, wherein a section of the belt is mounted above the slide plate in its longitudinal direction and arranged to be guided over the slide plate in sliding abutment against it, in such a manner that the mounted section of the belt assumes substantially the same radius of curvature as the slide plate, while the belt outside the ends of the slide plate forms a substantially freely downwardly hanging curve, and wherein on the external surface of the belt and in the individual links of the belt there is provided a groove to receive a cable which has to be spooled, with the result that during spooling the belt guides the cable and moves together with it.
In the spooling block device according to the invention it is advantageous for the radius of curvature of the slide plate to correspond to the radius of a circle, in such a manner that, when the belt is being guided, the section of the belt mounted on the slide plate approximately corresponds to a part of a circular arc. Furthermore it is advantageous for the groove to be curved either in the longitudinal direction or in the cross direction of the belt or in both directions, with the result that the groove becomes doubly curved.
Moreover it is advantageous for at least a part of the internal surface of each of the links to be designed as a slide plate which is guided on the slide plate in sliding abutment against it.
It is also advantageous for the spooling block device according to the invention to comprise a side guide on each side and connected to the sliding surface, and that at least a part of each of the lateral surfaces on each of the links is designed as a sliding surface which is guided on the respective side guide in sliding abutment against it.
Opposite the slide plate there is preferably provided a bottom plate, thus causing the external surface or the downwardly hanging section of the belt to be guided over the bottom plate and to be partially supported in abutment against it.
Finally it is advantageous for the slide plate and the bottom plate to be connected via respective side plates, and that the side plates simultaneously form the said side guides.
An embodiment of the invention in the form of a spooling block especially for handling seismic cables will now be explained in more detail with reference to the accompanying drawings, in which:
Figure 1 shows a spooling block device according to the invention viewed from one end;
Figure 2 is a sectional elevation through the spooling block device in Figure 1 , taken along line A- A;
Figure 3 shows the spooling block device of Figure 1 in a ready mounted state;
Figure 4 shows the spooling block device of Figure 3 viewed from above; and
Figure 5 is a perspective view of the ready mounted spooling block device.
The following description of an embodiment of the spooling block device according to the invention is based on a spooling block for use on board a vessel and arranged for handling seismic cables. It should be understood, however, that the invention can also be applied in other situations and with other types of cable than seismic cables.
The spooling block device according to the invention is viewed from in front in Figure 1. It simulates the diameter of a large spooling block or spooling wheel by forming a belt 1 consisting of a number of small, curved parts la in the form of links hinged together. These curved parts or links la have a bottom surface or underside with low friction and are best illustrated in Figure 2, arranged to slide on a curved surface formed by an upwardly curved slide plate 2 which is convex in the longitudinal direction. The radius of curvature of the slide plate preferably corresponds to the radius of a circle, in which case the links la, which are hinged together to form an endless belt when guided on the slide plate 2, approximately correspond to a part of a circular arc. The angle of this arc on the slide plate may be 180 degrees or less.
Outside the slide plate 2 the hinged links la enable the belt 1 to be turned back when the slide plate is passed and the belt will therefore form a substantially freely downwardly hanging curve below the slide plate, for example a chain curve. When the freely downwardly hanging curve again reaches the end of the slide plate 2, the belt is bent forward, once again due to the hinges between the individual links la, and the belt with links mounted on the slide plate continues along it with the desired radius of curvature. The section of the belt 1 which is located on the slide plate 2 forms only a small part of the whole circular arc in a large spooling wheel with the same radius as the radius of curvature for the mounted part of the belt, thereby giving the spooling block device according to the invention much smaller dimensions than a corresponding, standard spooling wheel.
As is best illustrated in Figures 1,3 or 4, there is provided in the individual links la in the belt 1 a groove lb to receive the cable (not shown) which has to be spooled, with the result that, during spooling, the belt both guides the cable and moves together with it. The groove lb is curved either in the longitudinal direction or in the cross direction of the belt 1 and preferably in both directions, the groove thus becoming doubly curved. The radius of curvature of the groove lb in the longitudinal direction gives a cableway in accordance with the specified minimum bending diameter for the cable, while the shape and dimensions of the groove otherwise have to be adapted to the cable dimension. Each of the links la in the belt 1 has a male hinge on one end and a female hinge on the other end, thus enabling them to be easily hinged together and connected as an endless belt.
On the underside of the slide plate 2 the belt is guided in a freely suspended curve, but in this curve section the belt can also come into sliding abutment against a bottom plate 3 over a part of its length, as indicated in Figure 2, or over its whole length. Parts of the surface of the belt and links beside the groove lb are advantageously made of the same low friction material as the underside of the belt 1. The belt 1 , the slide plate and the bottom plate 3 in the spooling block device according to the invention are illustrated for example in Figures 3,4 and 5 mounted in a frame, preferably formed by two side plates 4a, b which are attached between legs 5a,b in a yoke 5, the legs being connected by a crossbeam 5c. On the crossbeam 5c there can be provided, for example, a shackle 6 or a lifting strap, thus enabling the entire spooling block device to be suspended in a lifting device (not shown) or moved or handled thereby, for example when it has to be removed from the deck of the vessel. The side plates 4a,b form side guides for the belt 1 , and consequently the lateral surfaces on each of the links la are preferably equipped with sliding surfaces which are guided on the side plates in sliding abutment against them. At the same time the side guides or the side plates 4a, b protect the belt 1 against damage and also provide increased safety for the handling personnel.
As the spooling block device is designed and illustrated in Figure 2, the shackle 6 will transfer the load from the cable and the spooling block device to the aforementioned lifting device for the spooling block. As mentioned the spooling block device can be mounted freely suspended, for example, in the aforementioned lifting device or it can be mounted in a fixed frame (not shown) mounted on the deck of the vessel.
When a seismic cable has to be deployed or recovered the spooling block device according to the invention is placed at the desired location, for example the afterdeck of the vessel, and the cable is guided in the groove lb in the belt 1, while at the same time the belt moves with the cable. The cable is thereby protected against wear which can occur due to sliding against a surface. At the same time the curvature of the spooling block enables the cable to be deployed or recovered with the correct minimum bending diameter according to the specification for the cable concerned. The actual cable drum can be placed in the hold on the vessel.
An additional advantage of the spooling block device of the invention is that by virtue of its use of the sliding belt 1 on the slide plate 2, the load represented by the cable is spread over the relatively larger area of the slide plate, permitting the use of relatively lightweight and low cost plastics materials for the links la.
With regard to the actual belt 1 , it will be obvious to a person skilled in the art that it can be designed in different ways within the scope of the invention. Thus raised sections can be provided on the side of the groove lb on the top as well as the bottom of the links la and possibly also on the side of the links in order to form slide guides which, during cable handling and movement of the belt, come into sliding abutment against the slide plate 2, the bottom plate 3 or the side plates 4a,b respectively. The links la are preferably made of a suitable low friction material, for example a polymer material.
Thus it will be seen that the spooling block device according to the invention forms a particularly well suited device for deploying and recovering cables from the afterdeck of a vessel, where the space requirements are crucial. At the same time, during deployment and recovery the cable is given the same bending diameter as for a corresponding spooling wheel, thus enabling the cable to be guided to and from, for example, a cable drum provided in the ship's hold without incurring any damage during deployment and recovery.

Claims

1. A spooling block device, especially for seismic cables, the device comprising an endless, articulated belt formed by a number of hinged together links and a guide for the belt in the form of an upwardly curved slide plate which is convex in the longitudinal direction, wherein a section of the belt is mounted above the slide plate in its longitudinal direction and arranged to be guided over the slide plate in sliding abutment against it, in such a manner that the mounted section of the belt assumes substantially the same radius of curvature as the slide plate, while the belt outside the ends of the slide plate forms a substantially freely downwardly hanging curve, and wherein on the external surface of the belt in the individual links of the belt there is provided a groove for receiving a cable which has to be spooled, with the result that during spooling the belt guides the cable and moves together with it.
2. A spooling block device according to claim 1, wherein the radius of curvature of the slide plate corresponds to the radius of a circle, with the result that when the belt is guided, the section of the belt mounted on the slide plate approximately corresponds to a part of a circular arc.
3. A spooling block device according to claim 1 or claim 2, wherein the groove is curved either in the longitudinal direction or in the cross direction of the belt, or in both directions, the groove thus becoming doubly curved.
4. A spooling block device according to any preceding claim, wherein at least a part of the internal surface of each of the links is designed as a sliding surface which is guided on the slide plate in sliding abutment against it.
5. A spooling block device according to any preceding claim, further comprising a side guide on each side and connected to the slide plate, and whereinat least a part of each of the side surfaces on each of the links is designed as a sliding surface which is guided on the respective side guide in sliding abutment against it.
6. A spooling block device according to any preceding claim, wherein opposite the slide plate there is provided a bottom plate, the external surface of the downwardly hanging section of the belt being at least partly guided over the bottom plate.
7. A spooling block device according to claim 6 when dependent from claim 5, wherein the slide plate and the bottom plate are connected via respective side plates, and wherein the side plates simultaneously form the said side guides.
PCT/IB1997/000156 1996-02-08 1997-02-07 Spooling block device WO1997029302A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU16157/97A AU1615797A (en) 1996-02-08 1997-02-07 Spooling block device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO960509 1996-02-08
NO960509A NO960509D0 (en) 1996-02-08 1996-02-08 Coil Block Device

Publications (1)

Publication Number Publication Date
WO1997029302A1 true WO1997029302A1 (en) 1997-08-14

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ID=19899025

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB1997/000156 WO1997029302A1 (en) 1996-02-08 1997-02-07 Spooling block device

Country Status (3)

Country Link
AU (1) AU1615797A (en)
NO (1) NO960509D0 (en)
WO (1) WO1997029302A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2765183A1 (en) 1997-06-27 1998-12-31 Geco As SEISMIC LIFT VESSELS
WO1999065763A1 (en) 1998-06-12 1999-12-23 Schlumberger Holdings Limited Streamer handling apparatus for use on seismic survey vessels
WO2000041926A1 (en) 1999-01-13 2000-07-20 Schlumberger Holdings Limited Streamer handling apparatus for use on seismic survey vessels
CN103498908A (en) * 2013-09-24 2014-01-08 常熟市永固起重设备安装工程有限公司 Crawler-type sliding wheel

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH269369A (en) * 1946-08-31 1950-06-30 Limited Teleflex Products Device for guiding an endless cable of a conveyor at an angle of its course.
US4417718A (en) * 1979-12-20 1983-11-29 Niskin Shale J Counter balanced sheave assembly with multiple pulleys
FR2600740A1 (en) * 1986-06-26 1987-12-31 Jaussaud Pierre Bearing device for a taut cable moving in the direction of its length
FR2670544A1 (en) * 1990-12-12 1992-06-19 Kergreis Yvon Angular transmission with reduced overall size on which there runs a connection such as a cable, braided rope, pulley block element
US5149059A (en) * 1991-04-25 1992-09-22 Harken, Inc. Low profile multiple bearing block fairlead

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH269369A (en) * 1946-08-31 1950-06-30 Limited Teleflex Products Device for guiding an endless cable of a conveyor at an angle of its course.
US4417718A (en) * 1979-12-20 1983-11-29 Niskin Shale J Counter balanced sheave assembly with multiple pulleys
FR2600740A1 (en) * 1986-06-26 1987-12-31 Jaussaud Pierre Bearing device for a taut cable moving in the direction of its length
FR2670544A1 (en) * 1990-12-12 1992-06-19 Kergreis Yvon Angular transmission with reduced overall size on which there runs a connection such as a cable, braided rope, pulley block element
US5149059A (en) * 1991-04-25 1992-09-22 Harken, Inc. Low profile multiple bearing block fairlead

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2765183A1 (en) 1997-06-27 1998-12-31 Geco As SEISMIC LIFT VESSELS
WO1999000295A1 (en) 1997-06-27 1999-01-07 Schlumberger Canada Limited Seismic survey vessels
WO1999065763A1 (en) 1998-06-12 1999-12-23 Schlumberger Holdings Limited Streamer handling apparatus for use on seismic survey vessels
WO2000041926A1 (en) 1999-01-13 2000-07-20 Schlumberger Holdings Limited Streamer handling apparatus for use on seismic survey vessels
CN103498908A (en) * 2013-09-24 2014-01-08 常熟市永固起重设备安装工程有限公司 Crawler-type sliding wheel

Also Published As

Publication number Publication date
NO960509D0 (en) 1996-02-08
AU1615797A (en) 1997-08-28

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