Fishing – trapping – and vermin destroying – Fishing – Nets
Patent
1995-12-21
1997-07-08
Elpel, Jeanne
Fishing, trapping, and vermin destroying
Fishing
Nets
43 94, 43 95, 43 171, A01K 7302, A01K 7902
Patent
active
056448635
DESCRIPTION:
BRIEF SUMMARY
The invention relates to fishing gear for electric fishing, comprising a beam which is provided with pairs of electrodes over which a potential difference can be generated, as well as a power source and pulse generator.
Fishing gear of this type is disclosed in Netherlands Patent Application NL-A-8603257, published Jul. 18, 1988. In the case of this known gear, the power source and voltage generator are housed in one or both box-shaped shoes which are attached to the ends of the beam. However, the space inside a shoe of this type is limited. Moreover, said shoes are also exposed to high stress, for instance when the beam is dragged over a bottom which is uneven. Consequently, it is not easy to guarantee the watertightness of the box and correct functioning of the power source and pulse generator.
The aim of the invention is, therefore, to provide fishing gear of the abovementioned type which both offers a larger space for carrying equipment and also affords better protection. This is achieved in that the power source, the pulse generator and the connections for the electrodes are housed in a watertight chamber inside the beam.
According to the invention the beam is constructed in the form of an elongated box in which there is sufficient room to accommodate all components of the electrical system. Said components are consequently better protected against moisture and knocks than when in the shoes or in separate chambers on the outside of the beam.
Preferably, the pulse generator is housed in a chamber which for cooling purposes is partly flushed by water. The heat which the pulse generator generates during operation can now be dissipated directly to the surrounding water, without the other components becoming overheated. Excellent cooling can be achieved if channels extend through the beam from front to back in the direction the beam is dragged and transverse to its longitudinal direction, which channels delimit the chamber for the pulse generator.
In connection with ease of accessibility of all components, the chamber in the beam is closed at the top by means of a lid.
The beam according to the invention has a larger frontal surface area than the known beam. In order nevertheless to obtain good beam characteristics when dragging over the sea bed, the beam is rounded on the side which is at the front in the direction of drag and has passages for the electrodes at the back.
The electrodes are attached at their ends distal to the beam to the bottom edge of a trawl-net. The top edge of the trawl-net is attached to the top of the beam in a known manner.
The electrodes are preferably constructed with a core of arbitrarily shaped, conductive material, to which core metal electrode pieces of the desired shape and dimensions are electrically connected with regular spacings between them, whilst the core between the electrode pieces is insulated. Concentrated current pulses, which deliver an excellent excitation pulse, can be emitted using electrodes constructed in this way.
If a rubber sleeve extends between the electrode pieces, the electrodes can be reliably dragged along without becoming caught up behind obstacles.
The invention will now be explained in more detail with reference to an illustrative embodiment shown in the figures.
FIG. 1 shows a diagrammatic top view of a fishing vessel, in combination with the fishing gear according to the invention.
FIG. 2 shows a side view of part of the fishing gear.
FIG. 3 shows a top view of the beam.
FIG. 4 shows view IV--IV according to FIG. 3.
FIG. 5 shows view V--V according to FIG. 3.
FIG. 6 shows a cross-section through the beam on an enlarged scale.
FIG. 7 shows an electrode connection.
FIG. 8 shows a partially cross-sectional view of an example of a streamlined, circular design of a positive electrode.
FIG. 9 shows a partially cross-sectional view of an example of a streamlined, circular design of a negative electrode.
FIG. 10 shows a partially cross-sectional view of an example of a flat design of a positive electrode.
FIG. 11 shows a partially cross-sectional view
REFERENCES:
patent: 3312011 (1967-04-01), Wathne et al.
patent: 3415001 (1968-12-01), Ott et al.
patent: 3683280 (1972-08-01), Holt
patent: 3775891 (1973-12-01), Holt
patent: 3777388 (1973-12-01), Newman et al.
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