JPH04287632A - Otter board - Google Patents

Abstract

PURPOSE:To freely regulate the expanding force for an otter board by variably regulating the position of a movable board member between a fixed board member and an inner board member. CONSTITUTION:An outer board member 3 is made into the objective otter board 1 having plural board members using (1) a fixed member 4 with an opening and (2) a mobile board member 6 having such a shape as to close said opening and so provided as to freely move between the fixed board member and an inner board member.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to an otter board.
In particular, the present invention relates to an otter board that can freely adjust the spreading power of the trawl net.

0002

[Prior Art] Otterboards are generally used to open the trawl net during trawl fishing, and there are various configurations such as single-leaf and multi-leaf types, but it is necessary to adjust the deployment force depending on the purpose of fishing. be.

Conventionally, in order to adjust the deployment force of the otterboard, the angle of attack of the otterboard with respect to the towing direction has been changed or the area of the otterboard body has been changed.

0004

[Problems to be Solved by the Invention] However, since changing the angle of attack of the otter board impairs the stability of the opening action, this method has not been widely adopted in the past. In addition, in order to change the area of the otterboard, it is necessary to constantly equip the ship with several types of otterboards with different areas, which is expensive, requires a long time to replace the otterboard, and is dangerous. It was something. In particular, Japanese Unexamined Patent Publication No. 49-99881, Utility Model Application No. 6
In the bileaf otterboard disclosed in Japanese Patent No. 0-106458 and the like, the otterboards of each leaf are fixedly attached to each other, which occupies a large space and causes the above-mentioned inconvenience.

[0005] Therefore, in order to solve these problems, for example, Japanese Patent Publications No. 16858/1982 and Japanese Patent Publication No. 1983-16858,
A method as shown in Japanese Patent No. 42711 has been proposed.

[0006] In each of these methods, drain grooves or slit grooves are formed through a thick otter board, and the amount of water entering each groove is adjusted by changing the open groove area using an on-off valve or an otter flap. , This allows the Otterboard's deployment force to be variably adjusted.

However, in these methods,
The opening area of each groove on the inner surface of the otter board is fixed, and an on-off valve or otter flap is installed deep inside each groove to adjust the amount of water flowing in, so there is little variation in deployment force and a wide range of deployment force. It was difficult to make variable adjustments within the range.

The present invention has been made in view of these points, and has a simple configuration that allows the deployment force to be variably adjusted over a wide range, and allows the trawl net to be opened in accordance with the fishing purpose. To provide an otter board which can be used at all depths, such as bottom towing, low towing, mid to high towing, and top towing.

[0009]

Means for Solving the Problems In order to achieve the above object, the otter board of the present invention has a biplane board member, in which the outer board member is fixed to a fixed board member having an opening, and the otter board has a biplane board member. It is characterized by being formed by a movable board member which has a closing shape and is movably disposed between a fixed board member and an inner board member.

0010

According to the present invention, the deployment force of the otter board can be freely adjusted by variably adjusting the position of the movable board member between the fixed board member and the inner board member.

[0011]

Embodiments An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

FIGS. 1 to 3 show one embodiment of the present invention.

The otter board 1 of this embodiment includes an inner board member 2 and an outer board member 3. The outer board member 3 includes a fixed board member 4 having openings 5, 5 at two upper and lower locations, a shape that closes each of the openings 5, and a fixed board member 4 and an inner board member 2.
Two movable board members 6 movably arranged between
, 6. Each board member 2, 4, 6
The inner surface is curved so that it is concave. The inner board member 2 and the fixed board member 4 include a foot member 7 at the bottom and three connecting members 8a and 8 arranged horizontally.
b and 8c are connected in substantially parallel manner to increase the overall rigidity. The step member 7 is curved upward at the front. Each connecting member 8a, 8b, 8c
Through holes 9, 9 of appropriate size are bored in the. Each of the movable board members 6 has four members that protrude in parallel from the back surface of the inner board member 2 toward the fixed board member 4.
It is inserted into the screws 10, 10, ... of the book, and the fixing nut 11
, 11... are formed to be fixed in a predetermined position. In FIG. 1, for convenience of explanation, the upper movable board member 6 is shown in a position where the opening 5 is fully closed, and the lower movable board member 6 is shown in an intermediate position. In this case, the upper and lower movable board members 6, 6 are arranged at the same position. Warp 1 released from ship 18
2 are two connecting members 8b at the center of the otter board 1;
, 8c, the extended end is fixed to a warp connector 13 which is pivotally attached to the front end between the two ends of the warp connector 13 with suitable fittings such as bolts and nuts. A trawl net 1 is attached to the otter board 1 formed in this way via an otter pennant 14, a hand rope 15, a net pennant 16, etc.
7 are connected.

Next, the operation of this embodiment will be explained.

First, as shown in the upper movable board member 6 of FIG. 1 and the movable board member 6 shown by broken lines in FIG.
If it is fully closed, the area that receives the water flow will be the total internal area of the two board members 2 and 3, which is the maximum value for the Otterdodo 1.

On the other hand, as shown in the lower movable board member 6 in FIG. 1 and the movable board member 6 shown by solid lines in FIG. As the movable board members 6, 6 are brought close to the back surface of the inner board member 2, the area receiving the water flow gradually decreases. This is the total internal area of the fixed board member 4, which is the minimum value for the Otter Dode 1.

It is generally known that the developing force of an otterboard increases in proportion to the area of the otterboard.

Therefore, in this embodiment, the position of the movable board member 6 between the fixed board member 4 and the inner board member 2 is variably adjusted, and the area of the otter board 1 is variably adjusted. The deployment force of 1 can be freely set according to the purpose of fishing.

In addition, since the otter board 1 of this embodiment is formed into a compound leaf, the overall rigidity is high and it does not deform even when subjected to impact, and has high impact resistance. It can be used at all depths, including fishing, mid-level fishing, and upper-level fishing, and its underwater posture is stable, improving fishing efficiency.

It should be noted that the present invention is not limited to the above embodiments, and can be modified as necessary.

[0021]

[Effects of the Invention] Since the otter board of the present invention is constructed and operates in this manner, the deployment force can be variably adjusted over a wide range with a simple construction, and the otter board of the present invention can be used for trawl fishing in accordance with the purpose of fishing. The net can be opened and can be used at all depths such as bottom trawl, low layer trawl, middle layer trawl, and upper layer trawl.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the otter board of the present invention.

[Fig. 2] Cross-sectional view taken along line II-II in Fig. 1

[Fig. 3] A side view showing the leakage state of the otter board of the present invention.

[Explanation of symbols]

1 Otter board 2 Inner board member 3 Outer board members 4 Fixed board members 5 Opening 6. Moving board members 10 Spiral 11 Fixing nut

Claims (1)

[Claims] 1. In an otter board having a biplane board member, an outer board member is moved between a fixed board member having an opening, a fixed board member having a shape that closes the opening, and an inner board member. An otter board characterized in that it is formed by freely disposed movable board members.