US 7,165,502 B2Granted

Trawling vessel with a lock chamber

AssigneesSintef Fiskeri havbruk AS, Fiskerstrand Verft AS, Rolls-Royce Marine AS

InventorsRoar Pedersen, Håvard Røsvik, Birger Enerhaug, Snorre Angell, Oddmar Saure, Svein Helge Gjøsund

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Abstract

A trawling vessel is provided with a trawl net (5) for catching marine bio-resources, with a trawl sack (3) attached aft on a trawl net (5) for keeping the catch. The vessel comprises lines (51, 61) for towing and hauling the trawl net (5), and trawl drums (6) for hauling the trawl net (5). A lock chamber (1) is provided in a stern (21) of the vessel and has a main portion of its volume arranged below the design water line of the vessel. The lock chamber (1) is arranged for hauling the trawl sack (3) with the catch from the sea through a sluiceway (2) in the stern (21), for discharging the trawl sack (3), and for temporarily keeping the catch. A trunk channel (16, 12) leading up from the lock chamber (1) enables the trawl sack (3), in a generally discharged state, to be hauled up through the trunk channel (16, 12) to a deck (24), thereby leaving the catch in the lock chamber (1).

Claims28

Dependent claims

A trawling vessel for use with a trawl net for catching marine bio-resources, with a trawl sack attached aft on a trawl net for keeping the catch, said vessel comprising lines for towing and hauling said trawl net and trawl drums for hauling said trawl net;

with a lock chamber in a stern of said vessel, said lock chamber having a main portion of its volume below a design water line of said vessel, said lock chamber being arranged for hauling said trawl sack with the catch from the sea, through a sluiceway in said stern, and said lock chamber being arranged for discharge of said trawl sack and for temporarily keeping said catch;
and
with a forward trunk channel and an aft trunk channel leading up from said lock chamber and being arranged so that said trawl sack, in a generally discharged state, may be hauled up through at least one of said trunk channels to a deck, thereby leaving said catch in said lock chamber;
characterized by
a ceiling covering generally all of said lock chamber, with said forward trunk channel running through said ceiling;
in which a portion of the ceiling is arranged to extend below the vessel's water line, for the prevention of free surface wave formation in the lock chamber,
said aft trunk channel extending up through said ceiling from an aft end of said lock chamber, arranged for the entire, or an aft part, of said trawl sack in a generally discharged state, to be pulled up through said aft trunk channel.

4 more elements

Dependencies are inferred from the claim text.