GB2122562A - Improved pelagic trawl door or paravane - Google Patents

Improved pelagic trawl door or paravane Download PDF

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Publication number
GB2122562A
GB2122562A GB8317235A GB8317235A GB2122562A GB 2122562 A GB2122562 A GB 2122562A GB 8317235 A GB8317235 A GB 8317235A GB 8317235 A GB8317235 A GB 8317235A GB 2122562 A GB2122562 A GB 2122562A
Authority
GB
Grant status
Application
Patent type
Prior art keywords
paravane
trawl door
water
pelagic trawl
according
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.)
Withdrawn
Application number
GB8317235A
Other versions
GB8317235D0 (en )
Inventor
Jacobus Johannes Breugelmans
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.)
Seismograph Service Corp
Original Assignee
Seismograph Service Corp
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

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Classifications

    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01KANIMAL HUSBANDRY; CARE OF BIRDS, FISHES, INSECTS; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K73/00Drawn nets
    • A01K73/02Trawling nets
    • A01K73/04Devices for spreading or positioning, e.g. control thereof
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
    • B63B21/00Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/56Towing or pushing equipment
    • B63B21/66Equipment specially adapted for towing underwater objects or vessels, e.g. fairings for tow-cables

Abstract

A paravane 1 having a hydrofoil profile and towing means comprising a 3 leg bridle 2, 6 adapted for attachment to a tow line for towing the paravane through water, which paravane includes control means 7, 8 whereby the angle of attack of the paravane during its passage through the water can be remotely controlled, by moving the end of leg 6 along slide 8. <IMAGE>

Description

SPECIFICATION Improved pelagic trawl door or paravane This invention relates to an improved pelagic trawl door or paravane.

The problem of diverting objects from their natural path when under tow is not new.

Fishermen when trawling need to ensure that the mouth of the trawl net is open. The navy when sweeping for mines needs to ensure that a sufficient width of the sea bed is covered by the cutting cable behind the vessel.

In seismic surveys which used high explosives it was necessary to ensure that the explosion was offset far enough from the survey scale.

The primary device used for the purpose of diversion is the pelagic trawl door or paravane. This device, which has a hydrofoil profile, is towed in a vertical orientation with the profile set at an angle to the towing direction.

The flow of water over the vertical hydrofoil profile sets up a force which thrusts the device outwards from the towing vessel's direction of motion. The amount of diversion is controlled by the velocity of the vessel through the water and by the angle of attack of the leading edge of the trawl door.

A mechanism which has been used prior to this invention is shown in Fig. 1 of the accompanying drawings. A 'V' shaped bar or bridle (A) is attached to the trawl door so that the 'V' lies in a vertical plane. Towing means, which is attached to the towing vessel is attached to the apex (B) of the 'V'. Also, at this point, is attached a bar (C) which is sufficiently long to reach the middle section of the trawl door. This bar is fitted with a bolt hole through which can be passed a bolt. A horizontal metal member (D) is secured across the inner face of the trawl door. In this metal member (D) there is a series of holes of sufficient diameter to take a bolt of sufficient strength to withstand the diverting forces.

These holes are spaced at such an interval as to ensure adequate material strength in the structure. A suitable hole is chosen for a particular diversion required and, by means of a bolt, the bar (C) is attached to the member (D).

In order to change the amount of diversion it is necessary to bring the complete device together with the equipment being diverted on board the towing vessel and change the point of attachment.

With the development of arrays of seismic sources it has become possible to apply antenna theory to the design of the optimum array configuration. In order to achieve this optimum it is necessary to ensure that individual sub-arrays are towed at distances from the line of traverse of the survey vessel which are closely controlled. In addition, the size and complexity of the sub-array is such that the bringing in-board of the system becomes very difficult and time-consuming.

It is an object of the present invention to dispense with the need for the trawl door to be recovered. A further object of the present invention is the achievement of a finer degree of control of the diversion than is possible with the prior art method discussed above.

According to the present invention there is provided a pelagic trawl door or paravane having a hydrofoil profile and towing means adapted for attachment to a tow line for towing the paravane through the water, which paravane includes control means whereby the angle of attack of the paravane during its passage through the water can be remotely controlled.

Preferably the control means comprise a bridle movable relative to the paravane by means of a lead screw, and an electric motor for rotating said lead screw. It will be appreciated that other means for rotating the lead screw could be employed such as for example a hydraulic motor.

An embodiment of the paravane of the present invention will now be described, by way of example only, by reference to Figs. 2 to 5 of the accompanying drawings, in which: Figure 1 is a perspective view of a prior art paravane already discussed, Figure 2 is a plan of a paravane according to the present invention, Figure 3 is a side elevation of the paravane of Fig. 2, Figure 4 is a sectional detail of the mechanism employed to move the bridle of the paravane of Fig. 2 and Figure 5 is a sectional detail of the electric motor employed to dirve the bridle-moving mechanism of Fig. 4.

Referring to Figs. 2 to 5 of the drawings, a pelagic trawl door or paravane 1 of generally hydrofoil cross-section is provided with a three leg bridle 2. Legs 3 and 4 are pivotally attached both to the paravane 1 and to the bridle head 5. The third leg 6 is pivotally attached to the bridle head 5 and pivotally attached at its other end 7 to a longitudinally extending slide element 8. The slide element 8, which is constrained to slide along a foreand-aft track by guides 9, is affixed to a block 10 having a threaded aperture 11. A lead screw 1 2 passes through and engages with the threaded aperture 11 and the lead screw is fixed against axial movement but journalled for rotation within the body of the paravane.

A bevel gear 1 3 is mounted at one end of the lead screw 12, cooperating with a further bevel gear 1 4 which is mounted upon the output shaft of an electric motor 1 5. The electric motor, which is preferably one such as is obtainable for Lucas Aerospace is encased within a housing sealed against ingress of water. A waterproof electrical supply and con trol cable 1 6 passes into the paravane at 1 7 and hence into the motor via connection on the housing.

In operation, the paravane 1 is attached to a tow line by means of bridle head 5 and to an electric power source by means of electrical supply 1 6. The paravane travels through the water in a vertical orientation at an angle of attack dictated by the position of the pivot point 7 of the third leg 6 of the bridle 2. By rotating the lead screw 12, the slider element 8 and the pivot point 7 can be moved longitudinally forwards or backwards thus to increase or decrease respectively the angle of attack of the paravane in the water. A 4+" travel of the block 10 and slider element 8 has been found to be satisfactory.

The paravane can include various sensing devices for measuring such parameters as depth, velocity through the water, angle of attack etc. and these values can be relayed to a towing vessel which can be provided with all necessary monitoring control apparatus and switch gear.

It will be realized that the apparatus of the present invention enables the angle of attack of the paravane to be altered without bringing the unit in-board. Furthermore, the angle of attack is continuously variable over its range, unlike the prior art apparatus discussed hereinbefore.

Moreover, as comprehended within the definition of the invention hereinbefore, the paravane of the present invention is not restricted to use in a vertical orientation. By suitable location of the towing means on the paravanes the paravane can be arranged to travel in a horizontal orientation, in which case operation of the control means to alter the angle of attack of the paravane with respect to the water through which it passes will cause the paravane to travel more shallowly or more deeply through the water. In other words, by using the paravane in other than a vertical orientation, the operation of the control means can enable the paravane to function as a depth controller. The operation of the control means can be effected manually or automatically, e.g. by employing a pressure depth gauge or other depth sensing means.

Claims (16)

1. A pelagic trawl door or paravane having a hydrofoil profile and towing means adapted for attachment to a tow line for towing the paraven through water, which paravane includes control means whereby the angleof attack of the paravane during its passage through the water can be remotely controlled.
2. A pelagic trawl door or paravane according to Claim 1, wherein the control means comprises a movable bridle, a lead screw arranged to move the bridle upon rotation of the lead screw and rotation means for rotating the lead screw, whereby the position of the bridle relative to the paravane is adjustable by rotation of the lead screw.
3. A pelagic trawl door or paravane according to Claim 2, wherein said rotation means comprises an electric motor.
4. A pelagic trawl door or paravane according to Claim 2, wherein said rotation means comprises a hydraulic motor.
5. A pelagic trawl door or paravane according to Claim 2, wherein the bridle is provided with three legs and a bridlehead, two of said legs being pivotally attached to the paravane and to the bridlehead and the third leg being pivotally attached to the bridlehead and to a slide element mounted on the paravane for sliding movement relative thereto, said slide element being adapted for cooperation with said lead screw, whereby rotation of the lead screw causes movement of the slide element to move the position of the bridlehead relative to the paravane.
6. A pelagic trawl door or paravane according to Claim 1, wherein the paravane includes a sensing device for sensing information about the paravane and for relaying this information to a remote control point.
7. A pelagic trawl door or paravane according to Claim 6, wherein said sensing device is selected from one or more of the group consisting of a depth sensor, a velocity indicator, and an angle of attack sensor.
8. A pelagic trawl door or paravane according to Claim 1, which is provided with electrical connections whereby control signals can be passed to the paravane from a remote control point via an electric cable to control the angle of attack of the paravane.
9. A pelagic trawl door or paravane according to Claim 1, wherein a two position towing means is provided on the paravane such that in use the paravane can selectably adopt either a generally vertical orientation or a generally horizontal orientation.
10. A pelagic trawl door or paravane according to Claim 1 and arranged for use in a generally horizontal position, alteration of the angle of attack of the paravane during its passage through the water causing a change of depth of the paravane in the water.
11. A pelagic trawl door or paravane according to Claim 10, wherein depth sensing means are provided, adapted in use to control automatically the depth of the paravane in the water.
1 2. A pelagic trawl door or paravane having a hydrofoil profile and towing means adapted for attachment to a tow line for towing the paravane through water, said towing means including a bridle head movable relative to the paravane for altering the angle of attack of the paravane in the water adjustable support means for supporting and moving said bridle head relative to said paravane and adjusting means for adjusting the support means whilst the paravane is in use in the water.
1 3. A pelagic trawl door or paravane according to Claim 12, which is adapted to generally horizontally disposed in use whereby movement of the bridle head causes an alteration in depth of the paravane in the water.
14. A pelagic trawl door or paravane according to Claim 1 3, wherein means are provided for automatically controlling the depth of the paravane in the water.
1 5. A pelagic trawl door or paravane substantially as hereinbefore described with reference to Figs. 2 to 5 of the accompanying drawings.
16. The features herein before disclosed, or their equivalents, in any novel selection.
GB8317235A 1982-06-28 1983-06-24 Pelagic trawl door/paravane Withdrawn GB8317235D0 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB8218694 1982-06-28
GB8317235A GB8317235D0 (en) 1982-06-28 1983-06-24 Pelagic trawl door/paravane

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8317235A GB8317235D0 (en) 1982-06-28 1983-06-24 Pelagic trawl door/paravane

Publications (2)

Publication Number Publication Date
GB8317235D0 GB8317235D0 (en) 1983-07-27
GB2122562A true true GB2122562A (en) 1984-01-18

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Family Applications (1)

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GB8317235A Withdrawn GB8317235D0 (en) 1982-06-28 1983-06-24 Pelagic trawl door/paravane

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Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2557309A1 (en) * 1983-12-23 1985-06-28 Norway Geophysical Co Float used in seismic statements shall the sea bottom
GB2193476A (en) * 1986-07-09 1988-02-10 Exxon Production Research Co Remotely controllable paravane
WO1989010295A1 (en) * 1988-04-26 1989-11-02 Neil Richard Attenborough Improvements relating to sea anchors
US5357892A (en) * 1992-03-24 1994-10-25 Geco A.S. Deflector
WO2000020895A1 (en) * 1998-10-01 2000-04-13 Schlumberger Holdings Limited Control system for positioning of marine seismic streamers
US6691038B2 (en) * 2001-06-15 2004-02-10 Westerngeco L.L.C. Active separation tracking and positioning system for towed seismic arrays
GB2399883A (en) * 2003-03-27 2004-09-29 Westerngeco Seismic Holdings Controlling the depth of a marine deflector by varying its tilt angle
WO2005055708A1 (en) 2003-12-09 2005-06-23 Henning Skjold-Larsen Trawl driving devices, adjustment device, method and systems
WO2006011807A1 (en) * 2004-07-29 2006-02-02 Henning Skjold-Larsen Method and device for position monitoring
US7450467B2 (en) 2005-04-08 2008-11-11 Westerngeco L.L.C. Apparatus and methods for seismic streamer positioning
GB2452148A (en) * 2007-08-21 2009-02-25 Pgs Geophysical As Steerable paravane system for towed seismic streamer arrays
US20100149910A1 (en) * 2008-12-12 2010-06-17 Cggveritas Services (U.S) Inc. Seismic array towing system
US7822552B2 (en) 1996-12-20 2010-10-26 Westerngeco L.L.C. Control devices for controlling the position of a marine seismic streamer
WO2012022757A1 (en) * 2010-08-20 2012-02-23 Fugro-Geoteam As Connecting device for wide tow survey
WO2012070952A1 (en) 2010-11-22 2012-05-31 Baro Mekaniske As Seventh bridle block system for a paravane
GB2488638A (en) * 2011-03-04 2012-09-05 Pgs Geophysical As Controlling force developed by a paravane system
US8267031B2 (en) 2010-02-24 2012-09-18 Pgs Geophysical As Tension management control system and methods used with towed marine sensor arrays
WO2013014507A1 (en) 2011-07-22 2013-01-31 Josafatsson Atli Mar A trawl door or paravane with remote control adjustment
US8752493B2 (en) 2010-11-22 2014-06-17 Ulmatec Baro As Seventh bridle block system for a paravane
US8792297B2 (en) 2010-07-02 2014-07-29 Pgs Geophysical As Methods for gathering marine geophysical data
US9423519B2 (en) 2013-03-14 2016-08-23 Pgs Geophysical As Automated lateral control of seismic streamers

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3062171A (en) * 1959-02-17 1962-11-06 Somerville James Wing tip tow
US3560912A (en) * 1969-02-03 1971-02-02 Westinghouse Electric Corp Control system for a towed vehicle
US3605674A (en) * 1969-09-08 1971-09-20 Dresser Ind Underwater cable controller
US3613626A (en) * 1970-03-20 1971-10-19 Raymond E Kelly Remote operated lift control device
GB2017030A (en) * 1978-03-24 1979-09-26 Inst Francais Du Petrole Supporting systems for apparatuses to be towed under water from a ship
WO1981003475A1 (en) * 1980-05-30 1981-12-10 W Boyce Laterally and vertically controllable underwater towed vehicle

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3062171A (en) * 1959-02-17 1962-11-06 Somerville James Wing tip tow
US3560912A (en) * 1969-02-03 1971-02-02 Westinghouse Electric Corp Control system for a towed vehicle
US3605674A (en) * 1969-09-08 1971-09-20 Dresser Ind Underwater cable controller
US3613626A (en) * 1970-03-20 1971-10-19 Raymond E Kelly Remote operated lift control device
GB2017030A (en) * 1978-03-24 1979-09-26 Inst Francais Du Petrole Supporting systems for apparatuses to be towed under water from a ship
WO1981003475A1 (en) * 1980-05-30 1981-12-10 W Boyce Laterally and vertically controllable underwater towed vehicle

Cited By (45)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2557309A1 (en) * 1983-12-23 1985-06-28 Norway Geophysical Co Float used in seismic statements shall the sea bottom
GB2193476A (en) * 1986-07-09 1988-02-10 Exxon Production Research Co Remotely controllable paravane
US4729333A (en) * 1986-07-09 1988-03-08 Exxon Production Research Company Remotely-controllable paravane
GB2193476B (en) * 1986-07-09 1990-05-09 Exxon Production Research Co Remotely controllable paravane
WO1989010295A1 (en) * 1988-04-26 1989-11-02 Neil Richard Attenborough Improvements relating to sea anchors
US5357892A (en) * 1992-03-24 1994-10-25 Geco A.S. Deflector
US9395458B2 (en) 1996-12-20 2016-07-19 Westerngeco, L.L.C. Control devices for controlling the position of a marine seismic streamer
US7822552B2 (en) 1996-12-20 2010-10-26 Westerngeco L.L.C. Control devices for controlling the position of a marine seismic streamer
US9395459B2 (en) 1996-12-20 2016-07-19 Westerngeco, L.L.C. Control devices for controlling the position of a marine seismic streamer
US8743655B2 (en) 1998-01-10 2014-06-03 Oyvind Hillesund Control system for positioning of marine seismic streamers
US8230801B2 (en) 1998-01-10 2012-07-31 Westerngeco L.L.C. Control system for positioning of marine seismic streamers
WO2000020895A1 (en) * 1998-10-01 2000-04-13 Schlumberger Holdings Limited Control system for positioning of marine seismic streamers
US7293520B2 (en) 1998-10-01 2007-11-13 Westerngeco, L.L.C. Control system for positioning of a marine seismic streamers
US7080607B2 (en) 1998-10-01 2006-07-25 Westerngeco, L.L.C. Seismic data acquisiton equipment control system
US7222579B2 (en) 1998-10-01 2007-05-29 Westerngeco, L.L.C. Control system for positioning of marine seismic streamers
US6691038B2 (en) * 2001-06-15 2004-02-10 Westerngeco L.L.C. Active separation tracking and positioning system for towed seismic arrays
WO2004086092A2 (en) * 2003-03-27 2004-10-07 Westerngeco Seismic Holdings Limited System for depth control of a marine deflector
GB2399883B (en) * 2003-03-27 2007-06-27 Westerngeco Seismic Holdings System for depth control of a marine deflector
WO2004086092A3 (en) * 2003-03-27 2004-11-25 Per Helgerud System for depth control of a marine deflector
GB2399883A (en) * 2003-03-27 2004-09-29 Westerngeco Seismic Holdings Controlling the depth of a marine deflector by varying its tilt angle
US7658161B2 (en) 2003-03-27 2010-02-09 Westerngeco L.L.C. System for depth control of a marine deflector
WO2005055708A1 (en) 2003-12-09 2005-06-23 Henning Skjold-Larsen Trawl driving devices, adjustment device, method and systems
GB2431084B (en) * 2004-07-29 2010-02-24 Henning Skjold-Larsen Method and apparatus for position monitoring
WO2006011807A1 (en) * 2004-07-29 2006-02-02 Henning Skjold-Larsen Method and device for position monitoring
GB2431084A (en) * 2004-07-29 2007-04-18 Henning Skjold-Larsen Method and device for position monitoring
US7450467B2 (en) 2005-04-08 2008-11-11 Westerngeco L.L.C. Apparatus and methods for seismic streamer positioning
GB2452148B (en) * 2007-08-21 2012-02-15 Pgs Geophysical As Steerable paravane system for towed seismic streamer arrays
US7881153B2 (en) 2007-08-21 2011-02-01 Pgs Geophysical As Steerable paravane system for towed seismic streamer arrays
GB2452148A (en) * 2007-08-21 2009-02-25 Pgs Geophysical As Steerable paravane system for towed seismic streamer arrays
US8351294B2 (en) 2007-08-21 2013-01-08 Pgs Geophysical As Steerable paravane system for towed seismic streamer arrays
US9151859B2 (en) * 2008-12-12 2015-10-06 CGGVeritas Services (U.S.) Inc. Seismic array towing system
US20100149910A1 (en) * 2008-12-12 2010-06-17 Cggveritas Services (U.S) Inc. Seismic array towing system
US8267031B2 (en) 2010-02-24 2012-09-18 Pgs Geophysical As Tension management control system and methods used with towed marine sensor arrays
US9851464B2 (en) 2010-07-02 2017-12-26 Pgs Geophysical As Methods for gathering marine geophysical data
US8792297B2 (en) 2010-07-02 2014-07-29 Pgs Geophysical As Methods for gathering marine geophysical data
US8619496B2 (en) 2010-08-20 2013-12-31 Fugro-Geoteam As. Connecting device for wide tow survey
WO2012022757A1 (en) * 2010-08-20 2012-02-23 Fugro-Geoteam As Connecting device for wide tow survey
US8752493B2 (en) 2010-11-22 2014-06-17 Ulmatec Baro As Seventh bridle block system for a paravane
WO2012070952A1 (en) 2010-11-22 2012-05-31 Baro Mekaniske As Seventh bridle block system for a paravane
GB2488638A (en) * 2011-03-04 2012-09-05 Pgs Geophysical As Controlling force developed by a paravane system
GB2488638B (en) * 2011-03-04 2018-01-17 Pgs Geophysical As System and method of controlling force developed by a paravane system
US8347805B2 (en) 2011-03-04 2013-01-08 Pgs Geophysical As System and method of controlling force developed by a paravane system
US9474256B2 (en) 2011-07-22 2016-10-25 Atli Mar Josafatsson Trawl door or paravane with remote control adjustment
WO2013014507A1 (en) 2011-07-22 2013-01-31 Josafatsson Atli Mar A trawl door or paravane with remote control adjustment
US9423519B2 (en) 2013-03-14 2016-08-23 Pgs Geophysical As Automated lateral control of seismic streamers

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