US3188766A - Trawl gear - Google Patents

Trawl gear Download PDF

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Publication number
US3188766A
US3188766A US299296A US29929663A US3188766A US 3188766 A US3188766 A US 3188766A US 299296 A US299296 A US 299296A US 29929663 A US29929663 A US 29929663A US 3188766 A US3188766 A US 3188766A
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US
United States
Prior art keywords
headline
leg
legs
groundline
point
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
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US299296A
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English (en)
Inventor
Nicholls John
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.)
WHITE FISH AUTHORITY
Original Assignee
WHITE FISH AUTHORITY
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Filing date
Publication date
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Publication of US3188766A publication Critical patent/US3188766A/en
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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K73/00—Drawn nets
    • A01K73/02—Trawling nets
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K73/00—Drawn nets
    • A01K73/02—Trawling nets
    • A01K73/06—Hauling devices for the headlines

Definitions

  • This invention relates to cable sets which in use are attached to a trawl net to form the bridle assembly by which the net is towed, for example, along the sea bed.
  • the cable set provided by the invention achieves a substantial increase in the vertical mouth opening of the net, and also includes features which facilitate hauling and shooting of the trawl, in order to reduce the period of time required to unload a catch and thereafter reset the trawl.
  • the cable set comprises a pair of headline legs adapted to be attached to the ends of the headline of the trawl net, a pair .of groundline legs adapted to be respectively attached to the ends of the ground rope of the trawl net, a pair of link wires respectively adapted to link each headline leg to the ground rope, each link wire being attached at its upper end to its respective headline leg at a first point and at its lower end to a second point on said ground rope, there being a pair of second points on said groundrope, each second point being positioned aft of its nearest ground rope end, when the cable set is assembled and in use the arrangement is such that, during trawling, the link wires are slack but during shooting and hauling of said headline and groundline legs said link wires are tensioned by the moving of said headline legs forward relative to their respective groundline legs so that said headline legs are tensioned and thus prevented to a large extent from fouling their respective groundline legs.
  • a cable set or assembly constructed to operate in this way enables the satisfactory use of long headline and groundline legs, for example, of forty fathoms in length. This gives a consequential increase in the headline height obtainable during trawling, which in turn permits an increase in the vertical mouth opening of the net from the usual order of five to six feet to the order of sixteen feet, for example.
  • the invention includes both a setof cables adapted to be assembled in the way described, and also the assembled combination of cables and trawl net.
  • each pair of ends of the legs, remote from the headline and groundline attachment points and which are associated with the same side of the net are, or are adapted to be coupled to constitute in use towing points to which the trawling pull along the sea bed is applied.
  • the headline legs at a predetermined point between the towing points and their headline attachments are each provided with a haul attachment and these attachments are used when hauled to tension the link wires, by moving the headline legs forward relatively to the groundline legs, to apply the required load from the weight of the groundline bobbins to maintain the headline legs taut during hauling.
  • FIGURE 1 shows a sectional elevation of a part of the trawl net assembly, the section being taken on the centre line of the trawl net.
  • FIGURE 2 is a view of the otter board and the headline and groundline legs.
  • FIGURE 3 shows an enlarged view of details at A on FIGURE 2.
  • FIGURE 4 shows the same parts as in FIGURE 3 but in the position they assume at the commencement of hauling in the legs or just prior to shooting of the board.
  • FIGURE 5 shows an enlarged view of details contained in circle B on FIGURE 1.
  • FIGURE 6 shows the arrangement of the gear at the forward gallows when hang up of the net is in progress, hauling of the headline being completed and the ground rope is in the process of being banged up.
  • FIGURE 7 shows a half plan of a portion of the trawl net with the direction of travel vertically on the page.
  • This embodiment describes the operation of the trawl gear by the so called bang up system in which the ground rope is hauled into a shallow catenary, so that the ground rope bobbins can swing over the gunwale in the shooting and hauling of the trawl.
  • the headline may or may not be hauled into a shallow catenary.
  • the headline of a trawl net is shown at 10, one of the headline ends is shown at 11.
  • One ground leg 12 and one headline leg 13 are shown also. It will be appreciated that as one side of the net is being described various parts are duplicated for the other side of the gear that is not shown.
  • the trawl net is shown at 14 and the forward edge of the wing is shown at 15.
  • Ground rope 16 is partly shown and a link wire 17 is connected to the headline 10 at a first point 18 and with the ground rope 16 at a second point 19.
  • FIGURE 7 of the drawings shows how the link wire 17 is connected to a point spaced from the ends of the ground rope.
  • a Dan Leno bobbin 20 is shown connected in the ground rope 16 but the other rollers and bobbins of a typical ground rope have been omitted for clarity.
  • FIGURE 2 shows the otter board 23 and the towing warp 24.
  • the backstrop 25 has a Kellys Eye 30, at the towing point 26, which is formed by a special stopper forming the junction of the headline leg 13 and the groundline leg 12.
  • An independent piece 27 is connected at its forward end to a point just forward of the otter board 23. The other end of the independent piece 27 is attached to a ring in the headline leg 13; this ring will hereinafter be referred to as the haul attachment 28 and it i positioned at a predetermined point on the headline leg.
  • the arrangement of the haul attachment is best seen in the enlarged view in FIGURE 3.
  • the independent piece 27 is provided with a swivel 29 adjacent to the haul attachment 28 and the backstrop 25 is provided with a Kellys Eye 30, which slides on the groundline leg.
  • FIGURE 4 the load of the net is taken by the independent piece 27 through the haul attachment 28, the headline leg 13 and the groundline leg 12 are both taut during hauling or shooting of the headline and groundline legs.
  • FIGURE 5 the area around the point 18 on the headline leg 13 is shown enlarged.
  • the link wire 17 is shown in two parts, an upper first length 32 and a second length 33.
  • the first length 32 is attached to a Kellys Eye 34 mounted on the headline leg 13.
  • a headline ring 35 is formed in the headline leg 13 adjacent to the point 13 and the ring 35 acts as a stop to prevent the Kellys Eye 34 sliding aft.
  • the lower end of the first length 32 of linkwire 17 is provided with a stop ring 36 through which the end of the second length 33 passes.
  • Attached to the upper end of the second length 33 is a stop link 37 having a flattened link 38, the stop link 37 being too large to pass through the stop ring 36.
  • the present invention has the advantage that a greater headline height. is obtainablewiththe longer headline and groundline legs now made practicable due to the problem of fouling being largely overcome.
  • both the warps 24 are hauled in until the otter boards 23 reach their respective gallows 41 andare secured thereto.
  • the warps 24 are then slackenedand disengaged from the otter. boards and the hauling tension is then applied to the independent piece 27..
  • This has the effect of vmoving theheadlinei leg 13 forward relative to the :groundline leg 12 by a distance approximately equal to twice the distance between the towing point 26 and the hauling attachment 28.
  • the result of the relative m'ovement'forward of the headline leg 13 to, the groundline leg 12 is that the linkwire-17 istensio'ned and.
  • the headline leg 13 takes some of the load of the trawl, such that it is tautor substantially taut so that the chance'offouling of the headline leg 13 with the groundline'leg 12 is greatly reduced, if not eliminated altogether.
  • the hauling in of the legs 12 and 13 can then proceed, the Kellys Eye '30 sliding on the groundline leg, until the first point 18 is adjacent to the sheave 40.
  • a messenger Wire 45 is passed over the top sheave 44 and 'its G link 46 'isiconnectedinto the-jflattenedlink 38.
  • the headline leg '13 and the groundline leg 12 are both drawn out throughthe sheave 40 and they are both taut. This tautness greatly reduces .the chance of the headline leg 13 fouling the In certain circumstances, the legs '12 and 13 may be The present invention-using link wires 17 to prevent fouling of the headline and groundline legs may also be used equally well with a trawl, using the quarter rope system of operation.
  • a trawl gear comprising:
  • I 1 V p a link cable attached at a pointintermediate theends of each headline leg and extending directly to the ground rope and attached thereto;
  • the link cables are slack, while during shooting and hauling Y the cables are tensioned ,by forward movement of ends of the headthe headline legs relatively to the groundline legs with the result that the headline legs are tensioned i and restrained from fouling the groundline legs.
  • a trawl gear according to claim 1 in which a pair of towing points are provided, each towing point being .formed at thejunction of the forward end of a headline leg and the forward end of its respective groundline leg. '3. 'A trawl gear as claimed-in claim, 1,' in which a haul attachment isprovided in each headlin'e leg at a predetermined point,@sa'id point being determined such that when said headline. and groundline legs are being hauled in or shot the length alonga headline from the haul attachment to said first point plus the length 'of said link wire The distance between 'points' 18 measured along the curve of the' headline 10 is determined by the spacing ,7
  • headline ring 35 will depend uponthe ease of access'to the flattened link 38 when point 18 is at the sheave 40,
  • each link cable comprises two parts .slidably connected to one another.

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  • Life Sciences & Earth Sciences (AREA)
  • Environmental Sciences (AREA)
  • Animal Husbandry (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Wire Processing (AREA)
  • Mechanical Means For Catching Fish (AREA)
US299296A 1962-08-04 1963-08-01 Trawl gear Expired - Lifetime US3188766A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB30093/62A GB994651A (en) 1962-08-04 1962-08-04 Improvements in or relating to trawl gear

Publications (1)

Publication Number Publication Date
US3188766A true US3188766A (en) 1965-06-15

Family

ID=10302167

Family Applications (1)

Application Number Title Priority Date Filing Date
US299296A Expired - Lifetime US3188766A (en) 1962-08-04 1963-08-01 Trawl gear

Country Status (4)

Country Link
US (1) US3188766A (de)
DE (1) DE1191166B (de)
ES (1) ES290570A1 (de)
GB (1) GB994651A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6453597B1 (en) * 2000-06-14 2002-09-24 Lfs Inc. Rigging assembly methods and apparatus for trawling nets

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191209106A (en) * 1912-04-17 1913-04-10 Richard Adolph Herrmann Koch Improvements in and relating to Trawling Nets.
US1601893A (en) * 1924-04-23 1926-10-05 Vigneron Dahl & Cie Trawling gear

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE941523C (de) * 1948-10-02 1956-04-12 Karl Nischan Rollenjagergeschirr

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191209106A (en) * 1912-04-17 1913-04-10 Richard Adolph Herrmann Koch Improvements in and relating to Trawling Nets.
US1601893A (en) * 1924-04-23 1926-10-05 Vigneron Dahl & Cie Trawling gear

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6453597B1 (en) * 2000-06-14 2002-09-24 Lfs Inc. Rigging assembly methods and apparatus for trawling nets

Also Published As

Publication number Publication date
GB994651A (en) 1965-06-10
DE1191166B (de) 1965-04-15
ES290570A1 (es) 1964-01-01

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