Fishing – trapping – and vermin destroying – Fishing – Methods of fishing
Patent
1986-02-25
1988-07-26
Rowan, Kurt
Fishing, trapping, and vermin destroying
Fishing
Methods of fishing
43 65, 43 9, 56 8, 56 9, A01K 7302
Patent
active
047591463
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a procedure intended to create an underwater vortex, bringing about on the one hand an undermining of the bottom and on the other an upward rising water current capable of dislodging and lifting items lying on or half-buried in the bottom. The invention also concerns the device for carrying out such a procedure.
In the fishing industry, and particularly that of shell-fish, a technique known as dredge-fishing is often employed. This consists in lifting up the desired species and dragging them into a recovery net.
In another area, that of the preparation and maintenance of rearing beds for these shell-fish, in particular oyster-beds, the cultivator must go over the beds regularly with a harrow. This turns the bed, lifts up half-buried shellfish, and spreads them out more evenly.
The devices currently employed in such tasks, whether harrows or dredging nets, have numerous disadvantages. On the one hand they are heavy and cumbersome, and on the other they often cause damage to the whole local underwater environment. By raking the bed with teeth or blades, they can destroy the flora and fauna in their path and damage fish and shell-fish.
To overcome this drawback a device which creates an upward current was developed and described in an earlier patent application, made 26/10/1982 under the registration number 82178 74.
This uses a winged-shaped device which descends almost to the bottom, creating a mass of water and avoiding any direct contact between the device and the bottom. An upward rising current is created underneath and behind the device, carrying along the lighter items (fish, shell-fish, sand, etc.) which can then be then gathered into a recovery net.
However, despite the advantages of such a system over traditional methods, it still leaves something to be desired. The uncovering is not always effective. Again, the distance between the bottom of the wing and the sea floor must be very small, if the best results are to be obtained.
The invention described here has been designed to get round these disadvantages. It concerns a new process intended to create an efficient uncovering of the sea bed, and an upward rising current of water which carries up items lying on the sea floor or half-buried in it. The device can operate at a considerable distance from the sea bottom.
The invention offers an optimisation of results, in relation to the particular application chosen and the density of the species to be lifted or harvested.
It also covers all arrangements for operating the process. A first application plays the role of the harrow described above, and is used for maintenance of the sea floor, for example in oyster beds. Another application includes additional modifications which make it suitable for dredge-fishing of a variety of shell-fish, crustaceans and flat-fish.
More precisely this invention concerns a process for undermining the sea bed and creating an upward rising water current characterized by the fact that it causes at least one cylinder to rotate and at the same time confers on it a forward movement in such a way that an upward vortex is produced, capable of lifting items lying on the sea bed and carying them up on a trajectory which allows them to escape from the area of turbulence created by the said cylinder.
The invention will be better understood by referring to the explanations below and the attached diagrams, among which are:
FIG. 1 is an explanatory diagram illustrating the process in conformity with the invention;
FIG. 2 illustrates diagrammatically a first and a second variant in conformity with the invention;
FIG. 3 illustrates a variant of the invention particularly intended for dredge-fishing.
For greater clarity, the same items bear the same reference numbers in all the illustrations.
The process, in conformity with the invention, consists in creating a vortex intended to disturb the sea bed sufficiently to lift up items of a given order of weight which may be lying on the sea floor. This effect may be used either to distribute these items evenly, or to gath
REFERENCES:
patent: 436935 (1890-09-01), Corwin
patent: 991333 (1911-05-01), Lybeck
patent: 2029858 (1936-02-01), Couch
patent: 3783535 (1974-01-01), Hanks
patent: 3866396 (1975-02-01), Meyer
patent: 4259828 (1981-04-01), Pace
patent: 4434572 (1984-03-01), Sheldon
Jego Armel
Le Beon Roger
Plottel Roland
Rowan Kurt
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