EP0734202A1 - Improvements in or relating to fishing apparatus - Google Patents
Improvements in or relating to fishing apparatusInfo
- Publication number
- EP0734202A1 EP0734202A1 EP95902862A EP95902862A EP0734202A1 EP 0734202 A1 EP0734202 A1 EP 0734202A1 EP 95902862 A EP95902862 A EP 95902862A EP 95902862 A EP95902862 A EP 95902862A EP 0734202 A1 EP0734202 A1 EP 0734202A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- float element
- leading
- element according
- float
- rope
- 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- Withdrawn
Links
- 230000003019 stabilising effect Effects 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims description 10
- 239000004033 plastic Substances 0.000 claims description 7
- 229920003023 plastic Polymers 0.000 claims description 7
- 229920000098 polyolefin Polymers 0.000 claims description 2
- 238000010408 sweeping Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 19
- 238000010276 construction Methods 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- -1 polyethylene Polymers 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010102 injection blow moulding Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000001175 rotational moulding Methods 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
Classifications
-
- 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
- A01K73/04—Devices for spreading or positioning, e.g. control thereof
-
- 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
- A01K73/04—Devices for spreading or positioning, e.g. control thereof
- A01K73/05—Devices for spreading or positioning, e.g. control thereof for vertical sheering
Definitions
- Trawl fishing is well-known and the apparatus for such fishing comprises a bag-like net with an open mouth which is drawn through the water at a predetermined speed and depth whereupon fish in the path of the open mouth of the net are entrained and captured therein.
- buoyancy members may be captive in net-like bags and the said bags are secured to the bog-ropes.
- a float is provided in the form of a streamlined body having stabilising vertical and horizontal tail fins.
- the float has further laterally extending side fins whose purpose is to act as a kite and provide lift additional to the natural buoyancy of the float.
- That float is a torpedo shaped hollow aluminium body where the centre of buoyancy lies ahead of the centre of gravity in the intended direction of towing. This is intended to counter any tendency of the float to dive rather than lift.
- the body of the float is filled with gas at superatmospheric pressure.
- An object of this invention is to provide a float element which obviates or mitigates the aforesaid disadvantages. It is considered that the device to described hereinbelow is relatively cheap to manufacture, is made of the minimum number of components, offers improved strength and durability, and increased reliability and performance over the devices in current widespread use .
- the present invention seeks to provide a float element for the head-rope of a trawling net which element is not totally dependent upon its natural buoyancy for imparting an upward force on the head-rope.
- a preferred structure of the float element is characterised by an essentially solid body which has a leading portion providing the greater part of the buoyancy of the element, said portion having a upper leading edge and a lower leading edge with a leading surface therebetween which is inclined, with respect to a notional horizontal plane, at an angle in the range of from 35° to 60°, preferably in the range of from 45° to 55°, the said body further comprising a trailing portion which is generally flattened and thinner than the leading portion and said trailing portion of the body further has stabilising means extending upwardly therefrom to provide passive directional stability to the float element in use and additional hydrodynamic lift .
- the trailing portion has a generally planar undersurface terminating in a downturned lip which assists in countering a tendency for the element to flip over backwards from front to rear due to lift created by water pressure on the front surface (s) thereof during towing.
- the angle between the front surface and the bottom surface is greater than 110°.
- the float element is conveniently moulded from plastics material and the material selected for construction of the float element must obviously be of a density providing sufficient buoyancy in water.
- the planar front surface is inclined some 60° to the vertical and the bottom surface 10 makes an angle of some 123° with the front surface 5. This angle may vary between 110 and 140 degrees.
- the element is attached to a bog-rope e.g. by simply passing a tie-line through the throughbore 16.
- the manner of attachment may optionally include a swivel.
- the throughbore 16 may be lined with an abrasion resisting material.
- a plurality of float elements may be threaded onto a single bog-rope and the bog-rope is attached to a head-rope of a trawl net, as by lashings, at suitable spaced intervals along the length of the bog-rope.
- the head-rope will have the upper regions of the trawl net attached thereto.
- the tail portion of each element may be tied to the mesh of the net to ensure correct deployment without entanglement in the net.
- the towing lines are attached to the otter-boards and there is a natural tendency for the head-rope to drag in its mid-regions so that, in plan view, the head-rope adopts an arcuate configuration.
- the element 1 will therefore adopt a predicted relatively stable position with respect to the net during towing through the water such that the front surface will remain inclined to the water. This predetermined attitude is maintained during towing due to the design of the element .
- the combination of natural buoyancy and water flow over the inclined front and upstanding side surfaces generates a hydrodynamic lift which will be communicated to the bog-rope and, therefrom, to the head-rope to urge the head-rope upwardly.
- the improved float element proposed herein may be readily manufactured by moulding in plastics, it has an improved shape increasing lift and buoyancy whilst minimising drag to improve towing efficiency and by providing an essentially solid construction in contrast to the known prior art it is proof against implosion and may be used reliably at significantly greater depths.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
- Animal Husbandry (AREA)
- Biodiversity & Conservation Biology (AREA)
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB939325937A GB9325937D0 (en) | 1993-12-18 | 1993-12-18 | Improvements in or relating to fishing apparatus |
| GB9325937 | 1993-12-18 | ||
| PCT/GB1994/002681 WO1995016344A1 (en) | 1993-12-18 | 1994-12-07 | Improvements in or relating to fishing apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0734202A1 true EP0734202A1 (en) | 1996-10-02 |
Family
ID=10746863
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP95902862A Withdrawn EP0734202A1 (en) | 1993-12-18 | 1994-12-07 | Improvements in or relating to fishing apparatus |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0734202A1 (no) |
| GB (2) | GB9325937D0 (no) |
| IS (1) | IS4241A (no) |
| NO (1) | NO962573L (no) |
| WO (1) | WO1995016344A1 (no) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006011163A2 (en) * | 2004-07-26 | 2006-02-02 | Candis Ehf. | High speed, increased hydrodynamic efficiency, light-weight molded trawl door and methods for use and manufacture |
| AU2012327836B2 (en) | 2011-10-28 | 2014-07-31 | Gx Technology Canada Ltd. | Steerable fairing string |
| WO2016127245A1 (en) * | 2015-02-11 | 2016-08-18 | Global Dynamics Incorporated | Rigging configuration for a commercial fishing trawl |
| AU2016337528B2 (en) | 2015-10-15 | 2020-11-12 | Ion Geophysical Corporation | Dynamically controlled foil systems and methods |
| WO2017141111A1 (en) | 2016-02-16 | 2017-08-24 | Gx Technology Canada Ltd. | Ribbon foil depressor |
| BR112021005679A2 (pt) | 2018-10-09 | 2021-06-22 | Gx Technology Canada Ltd. | sistema modular de folha para conjunto marinho rebocado |
| GB202005885D0 (en) * | 2020-04-22 | 2020-06-03 | Josafatsson Atli Mar | Spreading device |
| WO2023215981A1 (en) * | 2022-05-12 | 2023-11-16 | Katchi Technologies Incorporated | Trawl net system and segment |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB191416564A (en) * | 1914-07-11 | 1914-11-26 | Douglas Keith Fairweather | Improved Float or Headline Lifter for Fishing Nets. |
| GB693238A (en) * | 1950-01-06 | 1953-06-24 | Raymond Roux | Improvements in or relating to trawl nets |
| FR1245612A (fr) * | 1959-09-14 | 1960-10-03 | Sustentateur auto-équilibre de chalut |
-
1993
- 1993-12-18 GB GB939325937A patent/GB9325937D0/en active Pending
-
1994
- 1994-12-07 GB GB9612742A patent/GB2299006B/en not_active Expired - Fee Related
- 1994-12-07 EP EP95902862A patent/EP0734202A1/en not_active Withdrawn
- 1994-12-07 WO PCT/GB1994/002681 patent/WO1995016344A1/en not_active Application Discontinuation
- 1994-12-13 IS IS4241A patent/IS4241A/is unknown
-
1996
- 1996-06-18 NO NO962573A patent/NO962573L/no unknown
Non-Patent Citations (1)
| Title |
|---|
| See references of WO9516344A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO1995016344A1 (en) | 1995-06-22 |
| GB9325937D0 (en) | 1994-02-23 |
| GB2299006A (en) | 1996-09-25 |
| IS4241A (is) | 1995-06-19 |
| NO962573D0 (no) | 1996-06-18 |
| GB9612742D0 (en) | 1996-08-21 |
| GB2299006B (en) | 1997-04-09 |
| NO962573L (no) | 1996-08-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| 17P | Request for examination filed |
Effective date: 19960708 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE DK ES FR GB IE IT NL PT SE |
|
| 17Q | First examination report despatched |
Effective date: 19960920 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 19970701 |