JPH0125565Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> This invention makes it possible to measure the distance of an otterboard from the seabed in the sea or the distance between both otterboards, and also to This relates to an Otter board that is designed to receive as little impact as possible.

<Prior art and its problems> An otter board is a device that is placed between a fishing net and a fishing boat and has the function of opening the opening of the fishing net.
It is also called a mesh expansion board. Therefore, the cross section of this Otterboard is formed into a bow shape, and the two Otterboards are designed so that they tend to move toward the left and right, but the distance in the left and right direction depends on the degree of expansion of the fishing net. It is very important to know the spacing (distance) between the two otterboards, as it has a big influence. On the other hand, the topography of the ocean floor is extremely undulating, and the depth position of the otter board generally matches the depth position of the fishing net, so knowing the depth position of the otter board is useful in knowing the depth position of the fishing net. In addition to being important, knowing the depth position of the otter board is also an important element in order to prevent the otter board from colliding with reefs on the ocean floor while being towed.

However, although otterboards have been commonly used for a long time, the lateral distance and water depth position of the otterboard are usually determined solely by the operator's intuition using the warp angle as a reference. was extremely primitive. Therefore, for example, as shown in Japanese Utility Model Application No. 55-38836, an Otterboard equipped with a measuring device to measure the distance between the Otterboard and the seabed has been developed. Shocks are often involved, and if you simply install the measuring device, it will also be subjected to shock. Therefore, there is a requirement that the device be installed in a position or condition where it can be avoided. Furthermore, the structure of this measuring instrument is extremely precise and requires measures to avoid direct impact.

<Means for Solving the Problems> Therefore, in order to solve the above-mentioned problems, the Otterboard according to this invention has a concave portion formed at a desired location on the curved inner surface of the Otterboard main body, which is curved to have an arcuate cross section, and the concave portion A measuring device for measuring the distance of the otterboard from the seabed in the sea and the distance between both otterboards is disposed within the otterboard, and a guard member opening at least downwardly and laterally surrounds the measuring device. In addition to measuring the underwater depth position of the Otterboard itself, that is, the distance between the Otterboard and the seabed in the sea, or the distance between both Otterboards, this measuring device should be placed in such a way that it will not receive as much external impact as possible. This is how it was done.

<Example> Next, an example of the otter board according to the present invention will be described based on the drawings. 1 is an otter board body whose cross section is curved into an arcuate shape (this is the same as that conventionally used). and
Reference numeral 2 denotes a recess formed at a desired location on the curved inner surface of the otterboard main body 1, in this embodiment approximately at the center in the vertical direction. Reference numeral 3 denotes a measuring device disposed within this recess 2, and this measuring device 3 consists of a battery, a transmitting element, and the like. And this measuring device 3
is used to measure the distance of the Otterboard main body 1 from the seabed in the sea and the distance between both Otterboards. Also, although there may be cases where an impact is applied to the Otterboard main body 1, since the measuring device 3 is disposed within the recess 2 of the Otterboard main body 1,
Since this measuring instrument 3 is protected from external impacts, the impact on the measuring instrument 3 itself is extremely small or non-existent. Also, the Otter board body 1
has a thickness of approximately 10 cm, so it is possible to form a recess 2 sufficient to accommodate the measuring instrument 3, but in the case of a small Otterboard main body 1, the thickness will inevitably be reduced. In such a case, the measuring instrument 3 may protrude from the recess 2, so in this case, as shown in the figure, the protruding part of the measuring instrument 3 is covered with a material that does not impair the measuring function of the measuring instrument 3. A guard member 4 that is open at least downwardly and laterally is provided.

<Function> As before, the otter board main body 1 is disposed between a fishing net and a fishing boat and towed. Then, the measuring device 3 is activated to determine the distance of the otterboard body 1 from the seabed and each otterboard body 1.
It measures the distance between. This distance is then received by the fishing boat, making it possible to measure the position of the otter board body 1 in the sea. Therefore, the transmitter of the measuring device 3 described above is
One that faces downward and one that faces sideways are required. Further, while measuring in this manner, the position of the otterboard main body 1 can be adjusted from the ship by adjusting the length of the warp.

<Effects of the invention> As described above, according to the otterboard according to the invention, a recess is formed at a desired location on the curved inner surface of the otterboard main body which is curved to have an arcuate cross-section, and in this recess, the otterboard is inserted into the ocean from the seabed. A guard member is provided with a measuring device for measuring the distance and the distance between both Otterboards, and is open at least downwardly and laterally.
Since it is arranged so as to surround the measuring device,
It is possible to measure the water depth position of the Otterboard body, that is, the distance between the Otterboard and the seabed in the sea, and the distance between both Otterboards. It is possible to avoid shock to the measuring instrument by itself, and the presence of an open guard member also allows
The effects are extremely large, such as making shock avoidance even more reliable without impairing the measurement function.

[Brief explanation of the drawing]

The drawings show an embodiment of the otterboard according to the invention, with FIG. 1 being a front view and FIG. 2 being a plan view. 1... Otter board body, 2... Recessed part, 3...
... Measuring device, 4... Guard member.

Claims (1)

[Scope of utility model registration request] A recess is formed at a desired location on the curved inner surface of the otterboard main body, which is curved to have an arched cross section, and a measuring device for measuring the distance of the otterboard from the seabed in the sea and the distance between both otterboards is disposed within the recess. An otter board characterized in that a guard member that is open at least downwardly and laterally is disposed to surround the measuring device.