US 8,943,736 B2 · High-lift otter board

Abstract

The invention has a curved board. The curved board is formed into a shape that curves in a curving direction corresponding to an expanding direction of a net opening in a towing state, from a front-side end section that is a front side in a towing direction in the towing state towards a rear-side end section that is a rear side in the towing direction in the towing state. At least one of a projecting structure having a projecting surface, a top board, and a bottom board is formed in the curved board.

Claims20

Dependent claims

An otter board that expands a net opening of a trawl net by being towed together with the trawl net by a trawler in a state in which the otter board is connected to the trawler and the trawl net, the otter board comprising:

a curved board that is formed into a shape curving in a curving direction corresponding to an expanding direction of the net opening from a front-side end section that is a front side in a towing direction in a towing state towards a rear-side end section that is a rear side in the towing direction in the towing state, and that moves in the expanding direction of the net opening in accompaniment with towing by the trawler, wherein
a projecting structure is formed on a surface of the curved board on a curving direction side over a region of a predetermined area on the front side on the surface on the curving direction side, the projecting structure having a projecting surface that projects further outward than the region of the predetermined area and is configured for reducing separation of flow at the front side on the surface and reducing generation of vortexes on the front side on the surface.

a curved board that is formed into a shape curving in a curving direction corresponding to an expanding direction of the net opening from a front-side end section that is a front side in a towing direction in a towing state towards a rear-side end section that is a rear side in the towing direction in the towing state, and that moves in the expanding direction of the net opening in accompaniment with towing by the trawler, wherein
a projecting structure is formed on a surface of the curved board on a curving direction side over a region of a predetermined area on the front side on the surface on the curving direction side, the projecting structure having a projecting surface that projects further outward than the region of the predetermined area, and
the otter board includes
a top board formed in an upper-side end section that is a vertical upper side of the curved board in the towing state, such as to extend in relation to the upper-side end section in the curving direction and a direction opposing the curving direction, in which an extension width in the curving direction in a section corresponding to the region of the predetermined area is the same or greater than an extension width in the curving direction in a section other than the section corresponding to the region of the predetermined area, or
a bottom board formed in a lower-side end section that is a vertical lower side of the curved board in the towing state, such as to extend in relation to the lower-side end section in the curving direction and a direction opposing the curving direction, in which an extension width in the curving direction in a section corresponding to the region of the predetermined area is the same or greater than an extension width in the curving direction in a section other than the section corresponding to the region of the predetermined area.

2 more elements

a curved board that is formed into a shape curving in a curving direction corresponding to an expanding direction of the net opening from a front-side end section that is a front side in a towing direction in a towing state towards a rear-side end section that is a rear side in the towing direction in the towing state, and that moves in the expanding direction of the net opening in accompaniment with towing by the trawler, wherein
a projecting structure is formed on a surface of the curved board on a curving direction side over a region of a predetermined area on the front side on the surface on the curving direction side, the projecting structure having a projecting surface that projects further outward than the region of the predetermined area, and
the otter board includes
a top board formed in an upper-side end section that is a vertical upper side of the curved board in the towing state, such as to extend in relation to the upper-side end section in the curving direction and a direction opposing the curving direction, in which an extension width in the curving direction in a section corresponding to the region of the predetermined area is the same or greater than an extension width in the curving direction in a section other than the section corresponding to the region of the predetermined area, and
a bottom board formed in a lower-side end section that is a vertical lower side of the curved board in the towing state, such as to extend in relation to the lower-side end section in the curving direction and a direction opposing the curving direction, in which an extension width in the curving direction in a section corresponding to the region of the predetermined area is the same or greater than an extension width in the curving direction in a section other than the section corresponding to the region of the predetermined area.

2 more elements

a curved board that is formed into a shape curving in a curving direction corresponding to an expanding direction of the net opening from a front-side end section that is a front side in a towing direction in a towing state towards a rear-side end section that is a rear side in the towing direction in the towing state, and that moves in the expanding direction of the net opening in accompaniment with towing by the trawler, wherein
a projecting structure is formed on a surface of the curved board on a curving direction side over a region of a predetermined area on the front side on the surface on the curving direction side, the projecting structure having a projecting surface that projects further outward than the region of the predetermined area, and
the otter board includes
a top board formed in an upper-side end section that is a vertical upper side of the curved board in the towing state, such as to extend in relation to the upper-side end section in the curving direction and a direction opposing the curving direction, in which an extension width in the curving direction in a section corresponding to the region of a predetermined area on the front side of the surface of the curved board on the curving direction side is the same or greater than an extension width in the curving direction in a section other than the section corresponding to the region of the predetermined area, and
a bottom board formed in a lower-side end section that is a vertical lower side of the curved board in the towing state, such as to extend in relation to the lower-side end section in the curving direction and a direction opposing the curving direction, in which an extension width in the curving direction in a section corresponding to the region of the predetermined area is the same or greater than an extension width in the curving direction in a section other than the section corresponding to the region of the predetermined area.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

13/201,198Filed 10 Feb 2010

Priority

JP 2009-03050812 Feb 2009

Published

US 2011/0308134 A122 Dec 2011

Granted

3 Feb 2015

Term ends

Not estimatedThe source records don’t support an estimate.

Classification4 codes

A01K 73/045
Devices for spreading or positioning, e.g. control thereof: for lateral sheering, e.g. trawl boards
B63B 21/66
Towing or pushing equipment: equipment specially adapted for towing underwater objects or vessels, e.g. fairings for tow-cables
A01K
Animal husbandry
B63B
Ships or other waterborne vessels

Abstract

Claims20

Dependent claims

a curved board that is formed into a shape curving in a curving direction corresponding to an expanding direction of the net opening from a front-side end section that is a front side in a towing direction in a towing state towards a rear-side end section that is a rear side in the towing direction in the towing state, and that moves in the expanding direction of the net opening in accompaniment with towing by the trawler, wherein
a projecting structure is formed on a surface of the curved board on a curving direction side over a region of a predetermined area on the front side on the surface on the curving direction side, the projecting structure having a projecting surface that projects further outward than the region of the predetermined area and is configured for reducing separation of flow at the front side on the surface and reducing generation of vortexes on the front side on the surface.

a curved board that is formed into a shape curving in a curving direction corresponding to an expanding direction of the net opening from a front-side end section that is a front side in a towing direction in a towing state towards a rear-side end section that is a rear side in the towing direction in the towing state, and that moves in the expanding direction of the net opening in accompaniment with towing by the trawler, wherein
a projecting structure is formed on a surface of the curved board on a curving direction side over a region of a predetermined area on the front side on the surface on the curving direction side, the projecting structure having a projecting surface that projects further outward than the region of the predetermined area, and
the otter board includes
a top board formed in an upper-side end section that is a vertical upper side of the curved board in the towing state, such as to extend in relation to the upper-side end section in the curving direction and a direction opposing the curving direction, in which an extension width in the curving direction in a section corresponding to the region of the predetermined area is the same or greater than an extension width in the curving direction in a section other than the section corresponding to the region of the predetermined area, or
a bottom board formed in a lower-side end section that is a vertical lower side of the curved board in the towing state, such as to extend in relation to the lower-side end section in the curving direction and a direction opposing the curving direction, in which an extension width in the curving direction in a section corresponding to the region of the predetermined area is the same or greater than an extension width in the curving direction in a section other than the section corresponding to the region of the predetermined area.

2 more elements

a curved board that is formed into a shape curving in a curving direction corresponding to an expanding direction of the net opening from a front-side end section that is a front side in a towing direction in a towing state towards a rear-side end section that is a rear side in the towing direction in the towing state, and that moves in the expanding direction of the net opening in accompaniment with towing by the trawler, wherein
a projecting structure is formed on a surface of the curved board on a curving direction side over a region of a predetermined area on the front side on the surface on the curving direction side, the projecting structure having a projecting surface that projects further outward than the region of the predetermined area, and
the otter board includes
a top board formed in an upper-side end section that is a vertical upper side of the curved board in the towing state, such as to extend in relation to the upper-side end section in the curving direction and a direction opposing the curving direction, in which an extension width in the curving direction in a section corresponding to the region of the predetermined area is the same or greater than an extension width in the curving direction in a section other than the section corresponding to the region of the predetermined area, and
a bottom board formed in a lower-side end section that is a vertical lower side of the curved board in the towing state, such as to extend in relation to the lower-side end section in the curving direction and a direction opposing the curving direction, in which an extension width in the curving direction in a section corresponding to the region of the predetermined area is the same or greater than an extension width in the curving direction in a section other than the section corresponding to the region of the predetermined area.

2 more elements

a curved board that is formed into a shape curving in a curving direction corresponding to an expanding direction of the net opening from a front-side end section that is a front side in a towing direction in a towing state towards a rear-side end section that is a rear side in the towing direction in the towing state, and that moves in the expanding direction of the net opening in accompaniment with towing by the trawler, wherein
a projecting structure is formed on a surface of the curved board on a curving direction side over a region of a predetermined area on the front side on the surface on the curving direction side, the projecting structure having a projecting surface that projects further outward than the region of the predetermined area, and
the otter board includes
a top board formed in an upper-side end section that is a vertical upper side of the curved board in the towing state, such as to extend in relation to the upper-side end section in the curving direction and a direction opposing the curving direction, in which an extension width in the curving direction in a section corresponding to the region of a predetermined area on the front side of the surface of the curved board on the curving direction side is the same or greater than an extension width in the curving direction in a section other than the section corresponding to the region of the predetermined area, and
a bottom board formed in a lower-side end section that is a vertical lower side of the curved board in the towing state, such as to extend in relation to the lower-side end section in the curving direction and a direction opposing the curving direction, in which an extension width in the curving direction in a section corresponding to the region of the predetermined area is the same or greater than an extension width in the curving direction in a section other than the section corresponding to the region of the predetermined area.

2 more elements

Dependencies are inferred from the claim text.

High-lift otter board

Life of this patent

Abstract

Claims20

High-lift otter board

Life of this patent

Abstract

Claims20