JPH0212872Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> This invention relates to an otterboard that prevents overturning as much as possible and has improved stability.

<Prior art and its problems> Otterboards are used to expand trawl nets from side to side.Otterboards, which have been commonly used in the past, are made of a thick board formed into a bow shape in the direction of travel. Most of them were.
However, with such a shape, although the net expansion effect was produced to a certain extent, the Otterboard would fall over, impeding the net expansion effect and being very inconvenient. Next, a type of otter board was developed that had a wide foot bar placed at the bottom of the body, but even this was not able to completely prevent the board from tipping over. Therefore, the next thing that was developed was an attempt to attach stabilizing blades fixedly at specific positions on the front or back of the Otterboard body, and although this resulted in increased stability, considering actual operations, it was difficult to It has been found that the timing is not always constant, and even if the same Otter board is used, stability cannot be achieved.

In general, it has been found that whether or not an otter board tips over during fishing is related to the water depth position of the otter board during fishing and the length of the rope from the fishing boat to the otter board. In other words, the standard is that the water depth of an otter board is 200 m, and the stability of an otter board at this depth is said to be very good. At this 200m depth position, the rope length is tripled, or 600m.
Efforts have been made to prevent the Otterboard from tipping over by doubling the length of the rope when the water depth is deeper than 200m, and increasing it five times when the water depth is shallower than 200m. It is not possible to effectively prevent falls. That is, as mentioned above, when the depth was deeper than 200 m, the Otterboard tended to fall outward, and conversely, when it was shallow, it tended to fall inward. Therefore, this Otterboard can only achieve the desired effect if it is used in a way that suits the operating environment.

On the other hand, as shown in Japanese Utility Model Publication No. 25-9354, there is also an otterboard in which rotatable wings are provided on both sides of the otterboard body.
According to this, the drag during towing increases depending on the angle of inclination or attack of this wing, and since this wing is always present on both sides of the Otterboard body, it is eventually canceled out by both wings. It turned out to be the same as one without wings, and could not be said to be effective in preventing falls.

<Means for solving the problem> Therefore, this idea is to install removable stabilizing blades on the front and back surfaces of the Otterboard body, so that the mounting position of the stabilizing blades can be changed according to the operating environment. , which makes it possible to exhibit even greater stability.

<Embodiment> Next, an embodiment of the otter board according to the present invention will be described based on the drawings. Reference numeral 1 indicates an otter board main body formed in a bow shape in longitudinal section, and numeral 2 indicates a shoe metal provided at the lower end of the otter board body. Reference numeral 3 denotes stabilizing blades that are removably disposed on the front and back surfaces of the otterboard main body 1. The stabilizing blades 3 are attached, for example, by a combination of bolts and nuts, but the mounting position depends on the operating environment, i.e. It is not necessarily specified by the water depth position of the otter board main body 1, but may be, for example, the part shown in the figure, or it may be all or a selected part of each position of the chain line 4 shown in the figure. In the figure, 5 is a bracket, and 6 is a pennant mounting member.

<Function> However, when using the Otterboard body 1, if it is necessary to place the Otterboard body 1 in a position deeper than 200 m depending on the operating environment, the Otterboard body 1 Therefore, when it is necessary to place the stabilizing wings 3 outward and the otterboard main body 1 in a shallower position than 200 m, the otterboard main body 1 tends to fall inward. Therefore, it is sufficient to attach the stabilizing blade 3 on the inside, that is, on the side that is toppled.

<Effects of the invention> As mentioned above, according to the otterboard according to this invention, removable stabilizing wings are provided on the front and back surfaces of the otterboard body, so that it can be adjusted depending on the operating environment, that is, the water depth position of the otterboard body. Since it can be selectively set and used, a stable state can be maintained at all times, which has an extremely large practical effect.

[Brief explanation of the drawing]

The drawings show an embodiment of the otterboard according to the invention, and FIG. 1 is a front view, and FIG. 2 is a sectional view taken along the line A--A in FIG. 1. 1...Otterboard body, 2...Shoe metal, 3...Stabilizing wing, 4...Mounting position of stabilizing wing 3, 5...Bracket,
6... Pennent mounting member.

Claims (1)

[Scope of utility model registration request] This Otterboard is characterized by having removable stabilizing wings placed on the front and back sides of the Otterboard body.