JP4904634B2 - Troll network - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a troll net body which is naturally gentle and does not roughen the seabed using a flexible net member having flexibility.
[0002]
[Prior art and problems to be solved by the invention]
In general, a large and regular otter board is widely used to widen the net opening of the drag net.
[0003]
However, since the otter board is made of metal and has a large weight, there is a problem that the marine resources on the seabed are greatly damaged when the otter board comes into contact with the seabed during the operation of the trawl fishery.
[0004]
As a means to solve this problem, a net body made of a flexible member such as a canvas ground attached to the net itself and the vicinity thereof is used to widen the net mouth of the net. It is possible to do.
[0005]
This flexible expansion body is formed into a wing shape by a canvas, and is attached to the position of the upper part or lower part of the net part of the sleeve net, the net part, etc. In response to the water flow, the net mouth of the pulling net is expanded.
[0006]
However, even if such a flexible reticulated body is installed in the middle of a pulling rope similar to an otter board, the wing part does not open, so that the expanded net corresponding to the area when the wing part is expanded. I couldn't use my power and was not available.
[0007]
The present invention has been made in view of these points, and can be used by being installed in the middle of a towline in the same manner as a conventional otter board by using a flexible net member having flexibility. The purpose is to provide a troll expansion body that is kind to nature and does not damage the seabed.
[0008]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the trawl expansion body of the present invention has a rigid member having rigidity at least in the vertical direction disposed on the upstream side and a connecting member on the downstream side of the rigid member so that the angle of attack against water is increased. And a flexible netting member connected and arranged to determine .
[0009]
According to the present invention, when the trawl expansion body is thrown into the water together with the pulling net, the angle of attack with respect to water is determined by connecting the rigid member having rigidity at least in the vertical direction with the connecting member. Thus, the water flows into the inner surface of the downstream flexible network member, and the flexible network member is expanded in a wing shape, so that the water flow flows with a predetermined angle of attack to water and a predetermined area. When you receive it, you will be able to demonstrate your network expansion. In addition, even if the flexible network member is in contact with the seabed, it has flexibility so that the seabed is not roughened, and the flexible network member prevents the rigid body member from contacting the seabed. Protection can be achieved.
[0011]
Further, when a trawl spreader is formed by a rigid member composed of an otter board disposed on the upstream side and a flexible mesh member disposed on the downstream side connected to the rigid member, the otter board is formed. And the flexible netting member act as a bi-leaf otter board to exhibit the netting force.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to FIGS.
[0013]
FIG. 1 to FIG. 3 show an embodiment of the trawl expansion body of the present invention, which is applied to a bottom pulling net.
[0014]
As shown in FIG. 1, two pulling ropes 2 and 2 are fed out from a trawler 1, and the trawl nets 3 and 3 of the present embodiment are fixed to the respective downstream ends, and the otter penent 4 is disposed downstream thereof. 4 is attached through 4.
[0015]
Each trawl expansion body 3 is formed as shown in FIGS. The trawl network 3 is formed by a rigid member 6 arranged on the upstream side and a flexible network member 7 connected to the rigid member 6 and arranged on the downstream side. One rigid member 6 is formed in a frame shape made of reinforced resin, and has a shape in which two vertical sides 6a and three horizontal sides 6b are connected. The other flexible net member 7 is formed by a hydrofoil portion 8 and a connecting member 9 that connects the hydrofoil portion 8 to each lateral side 6 b of the rigid member 6. The hydrofoil portion 8 has a semicircular cross-sectional shape made of a planar inner fabric 8a made of a flexible member such as canvas and a flexible member (the shaded portion of the thin line in FIGS. 2 and 3). The outer fabric 8b is formed by arranging four rows in the vertical direction in the form of a long bag before and after opening the opening 10 only at the upstream end (left end in FIGS. 2 and 3), and the opening 10 is formed into a wing-like substantially rigid body shape by the water flowing in from 10. The rigid body member 6 is configured so that the upper and lower end edges and the center portion of the inner fabric 8a are respectively connected to the rigid body member 6 by the respective connecting members 9 so as to determine the angle of water attack of the inner fabric 8a of the flexible netting member 7 with respect to the rigid body member 6. The rectangular mesh 9a on the side (cross thin line portion in FIGS. 2 and 3) and the triangular fabric 9b on the inner fabric 8a side are connected. A rope may be used instead of the netting 9a and the fabric 9b. The tow rope 2 is connected to the horizontal side 6b of the central portion of the rigid member 6, and the otter pennant 4 is connected to the downstream vertical side 6a.
[0016]
Next, the operation of this embodiment will be described.
[0017]
First, when the net 5 or the like mounted on the trawler 1 is thrown into the water, the net 5 is cast in the order of the trawl 5, the otter penent 4, the trawl spreader 3, and the towline 2. Since this embodiment does not have a large and heavy otter board, the operation is extremely safe and easy.
[0018]
Each trawl spreader 3 thrown into the water receives a water flow and is connected to a rigid member 6 arranged on the upstream side by a component in the outer direction of the external force. When water flows into the inner surface side of the inner cloth member 8a of the hydrofoil wing 8 and the flexible network expansion member 7 is expanded in a wing shape, and receives a water flow, the network expansion force is exhibited. In particular, in the present embodiment, since each of the expansion bodies 7 has the bag-like hydrofoil portion 8, the inner fabric 8a and the outer fabric 8b of the hydrofoil portion 8 immediately after being put into the water. In between, water flows in from the opening 10 at the upstream end to inflate the hydrofoil wing 8 to form a wing-like substantially rigid body, and at the same time, the hydrofoil wing 8 is put into the water by cooperation with the rigid member 6. Thereafter, the angle of attack to water is automatically set to a predetermined value at an early stage to maintain a stable posture, so that a net expansion force is generated in each hydrofoil section 8 and the drag net 5 rapidly expands the net mouth. Opened. Thereby, in this embodiment, the drag net 5 can be extended to an operable state at an early stage. Moreover, in the flexible net | network expansion member 7 of this embodiment, since the several connection member 9 is provided in the inside of the hydrofoil part 8, wing-like shape maintenance is performed reliably. Therefore, according to the trawl expansion body 3 of the present embodiment, an extremely large network expansion force is generated at an early stage and applied to the drag network 5. The inner fabric 8a of the hydrofoil unit 8 may be omitted.
[0019]
Further, according to the trawl expansion body 3 of the present embodiment, the flexible expansion network member 7 has flexibility even if it contacts the sea floor, and therefore does not roughen the sea floor, and further, the flexible expansion network member. 7 can prevent the rigid body member 6 from coming into contact with the seabed, and can protect the nature.
[0020]
Moreover, the lifting net work on the ship such as the pulling net 1 is very easily performed in the reverse process to the throwing net work.
[0021]
Figure 4 is an illustration of another embodiment of the present invention, as compared to the embodiment shown in FIGS. 2 and 3, the lateral edges 6b of the rigid member 6 increases one further variable than the rigid member 6 The flexible expansion net member 7 is formed with a large area. The same components as those in FIG. 2 and FIG. By forming in this way, the area of the flexible netting member 7 can be freely adjusted, and the trawl netting of a size that exhibits an appropriate netting force to obtain the required netting force. You can get a body. For example, the maximum area of the flexible net member 7 can be adjusted to 1 to 7 times the maximum area of the rigid member 6. In addition, a plurality of flexible netting members 7 including hydrofoil portions 8 having different areas with respect to the rigid member 6 may be provided and replaced according to the purpose of use.
[0022]
FIG. 5 shows still another embodiment of the present invention, in which an otter board 11 having a known configuration is used in place of the frame-like rigid member 6 in the embodiment shown in FIGS. . The same components as those in FIG. 2 and FIG. According to this embodiment, since both the otter board 11 and the flexible netting member 7 receive a water flow and exhibit the netting power, it is possible to act as a biplane otter board and exhibit the netting power. it can.
[0023]
FIG. 6 shows still another embodiment of the present invention, in which the area of the flexible netting member 7 is formed larger than that of the otter board 11 as compared with the embodiment shown in FIG. The same components as those in FIG. According to this embodiment, since both the otter board 11 and the flexible netting member 7 receive a water flow and exhibit the netting power, it is possible to act as a biplane otter board and exhibit the netting power. In addition, the area of the flexible network member 7 can be freely adjusted (for example, 1 to 7 times that of the otter board 11), and an appropriate network expansion force for obtaining the required network expansion force can be obtained. A trawl expansion body having a size to be exhibited can be obtained.
[0024]
Further, the present invention is not limited to the above-described embodiment, and can be changed as necessary.
[0025]
【Effect of the invention】
As described above, the trawl network of the present invention is constructed and acts, so that it is installed and used in the middle of a towline using a flexible network member having flexibility, like a conventional otter board. And can be made to be nature friendly without destroying the seabed.
[0026]
Specifically, when the trawl expansion body is thrown into the water together with the pulling net, the angle of attack with respect to water is determined by connecting the rigid member having rigidity at least in the vertical direction with the connecting member. water flows into the inner surface of the downstream side of the flexible net-mouth expanding member coupled to the flexible net-mouth expanding member is flared wing, the water flow predetermined to water attack angle and with a predetermined area When you receive it, you will be able to demonstrate your network expansion. In addition, even if the flexible network member is in contact with the seabed, it has flexibility so that the seabed is not roughened, and the flexible network member prevents the rigid body member from contacting the seabed. Protection can be achieved.
[0028]
Further, when a trawl spreader is formed by a rigid member composed of an otter board disposed on the upstream side and a flexible mesh member disposed on the downstream side connected to the rigid member, the otter board is formed. And the flexible netting member can act as a double leaf otter board to exhibit the netting force.
[Brief description of the drawings]
FIG. 1 is an overall perspective view showing a trawl fishing method using an embodiment of a trawl net of the present invention. FIG. 2 is a perspective view showing an embodiment of the trawl net of the present invention. FIG. 4 is a perspective view showing another embodiment of the trawl net of the present invention. FIG. 5 is a perspective view showing still another embodiment of the trawl net of the present invention. The perspective view which shows other embodiment of the trawl expansion body of invention.
2 Pulling rope 3 Troll widening body 5 Pulling net 5 Net opening 6 Rigid member 7 Flexible netting member

Claims (2)

A rigid member having rigidity in at least the vertical direction disposed on the upstream side, and a flexible network member disposed so as to be connected to determine the angle of attack with respect to the water with a connecting member on the downstream side of the rigid member. A trawl expansion body characterized by comprising: A trawl net body having a rigid member made of an otter board arranged on the upstream side and a flexible net member connected to the rigid member and arranged on the downstream side .

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