Trawl-net apparatus having controlled net opening and closing
AssigneeAgence Nationale de Valorisation de la Recherche (ANVAR)
InventorPhilippe Bourret
Life of this patent
Estimating the term…
Abstract
The trawl-net apparatus includes, between the net and the bottom, a closing-opening mechanism provided with a first control device. The mechanism holds the entrance of the bottom closed while leaving the rear of the net open. Under action of its control device, the rear of the net is caused to communicate with the entrance of the bottom. A folding over closing system is provided with a second control device and under the action of this control devices allows the mouth fold back rearwardly, then ensures, by a stopper, the closing of the mouth. The trawl-net with controlled opening and closing is advantageously used for selective gathering of pelgic micro-necton.
Claims11
In a trawl-net apparatus with controlled opening and closing, useable particularly for selectively gathering pelgic micro-nection, the apparatus including a net having a mouth, a rear portion, a diving panel and a back bar at said mouth, the net being continued at said rear portion with a trawl-net bottom and a collector, the improvement wherein said rear portion of said net is connected to an entrance of said trawl-net bottom by a frame chamber provided with a swivellable door having a central opening, sides of said entrance of said trawl-net bottom being fixed on said door around said central opening;
- wherein said rear portion of said net is fixed to an entrance of said frame chamber, said door in a horizontal position in said frame chamber, closing said trawl-net bottom by flattening same and leaving said rear portion of said net in communication with space outside of said frame chamber and said door in a vertical position closing an outlet of said frame chamber providing communication between said rear portion of said net and an inlet of said trawl-net bottom by opening of said door;
- and wherein said frame chamber is provided with a locking device for maintaining said door in the horizontal position and with swivelling means for swivelling said door to the vertical position after unlocking;
- and including a first automatic control means operatively coupled to said locking device for initiating movement of said door from the horizontal position to the vertical position;
- and wherein said net is provided with a folding backclosing system including a second automatic control means for letting said mouth of said net fold back rearwardly, and stopper means for closing said mouth, said stopper means being responsive to said second automatic control means.
Dependencies are inferred from the claim text.