JP2806565B2 - Method of manufacturing floating bodies for catching fishing nets - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a floating body used for locking a fishing net or the like at a predetermined position on the sea.

(Prior Art) Conventionally, as a floating body used for locking at a predetermined position on the sea such as a fishing net, a sphere formed of glass spheres or vinyl chloride has been used. These are all designed to generate a predetermined buoyancy with the interior as a space. The sphere is covered with a net to form a locking portion, and a fishing net or the like is connected to the locking portion.

The above-mentioned spheres have a thick skin to prevent them from colliding with drifting objects on the sea and being torn or being torn during handling during work.Therefore, the disadvantage is that the sphere is heavy and inconvenient to handle. is there. In addition, there is also a problem that buoyancy is lost when the skin is torn, and the skin sinks.

For this reason, plastic floating bodies have been put into practical use. As a method of manufacturing such a plastic floating body, for example, as disclosed in Japanese Patent Laid-Open No. A cylindrical body is fitted to and adhered to a perforated pillar of a plastic first bowl-shaped body having: a first bowl-shaped body fitted with a cylindrical body to this perforated pillar; A proposal has been made in which a plastic second bowl-shaped body having a through-hole pillar in the center is rotationally friction-bonded so that edges of the bowl-shaped bodies are aligned with each other.

Further, as disclosed in Japanese Utility Model Publication No. 34-20842, a floating ball molded from cellular plastic is completely covered with a plastic outer skin, and a hard plastic pipe for inserting a net into the center of the floating ball. Which are fixed at both ends with plastic nuts.

(Problems to be solved by the invention) However, in the above-described conventional technology, seawater or the like may enter the floating body. Further, in the former conventional technique, the edge portions of the pair of bowl-shaped bodies are merely abutted and bonded to each other, so that the strength of the abutted portion is weakened. Furthermore, in the latter prior art, the floating ball is spherical and the outer dimensions are large, so the mold cost is high, and the rope guide pipe is passed through the center of the floating ball and fixed with a nut, so that the parts are connected. It is dangerous because the number increases and the cost increases, and the edge-shaped collar portion protrudes largely outward.

(Means for Solving the Problems) The present invention forms a pair of hemispherical skins made of a plastic thin plate and having ribs projecting from the periphery thereof, and cuts out the ribs from one of the skins and the other. Notches are formed in part of the circumferential direction of the ribs of the skin, and the respective skins are respectively bonded to a pair of hemispherical core members made of a plastic independent foam corresponding to the inner volume of each skin. After putting on,
The end faces of each core material are overlapped with each other, and the rope guide pipes extending from each skin toward the center and penetrating each core material are joined to each other, and the ribs on the peripheral edge of the other skin are attached to the outer peripheral surface of one skin. The fitting is performed, and the rib is heat-shrinked by using the notch so as to be in close contact with the outer peripheral portion of one of the skins, and the fitted portion is bonded to form a spherical shape. An object of the present invention is to provide a method for manufacturing a floating body for locking such as a fishing net.

(Operation) In the above configuration, a pair of hemispherical skins with ribs protruding from the peripheral edges are formed, the ribs are cut from one of the skins, and one of the ribs on the other skin in the circumferential direction. Since the notch is formed in the portion, one skin and the other skin can be manufactured by the same mold. In addition, since each skin is covered while being bonded to a pair of hemispherical cores made of a plastic independent foam corresponding to the inner volume of each skin, one core and the other core can be manufactured with the same mold. At the same time, the core material is hemispherical, and the outer dimension is half that of the spherical one. Furthermore, the end surfaces of the respective core materials are overlapped with each other, and the rope guide pipes of the respective skins are joined to each other, and the ribs of the peripheral portion of the other skin are fitted to the peripheral outer surface of the one skin, and the notch is used. The ribs are heat-shrinked to adhere to the outer peripheral edge of one of the skins, and the fitting portion is bonded to form a spherical shape, so that the peripheral edges of the pair of skins are water-tight over a wide area due to the heat shrinkage of the ribs. Let it be maintained.
In addition, the fitting portion is a two-layered structure of the rib and the peripheral portion of one of the skins, and the rib does not protrude largely outward like an edge like a brim.

(Embodiment) In FIG. 1, a spherical floating body 10 is formed by covering a core material 4 made of a plastic independent foam with skins 2 and 3 made of a plastic thin plate. This floating body
In FIG. 10, a rope guide 5 composed of a through hole through which a not-shown locking rope is inserted is formed.

The skins 2 and 3 are configured as shown in FIG.
That is, the skin 2 is made of a thin plate made of plastic such as polyethylene or vinyl chloride, and the skin body 21 is formed in a hemispherical shape, and a pipe 23 extending in the center direction of the sphere is integrally formed at the center thereof. A rib 22 having a slightly larger outer shape is formed so as to protrude from the periphery of 21.
A notch 24 is formed in a part of the rib 22 in the circumferential direction so that the rib 22 contracts and adheres to the outer surface of the front surface 3 when joining with the other skin 3. The thickness of the skins 2 and 3 may be selected within a range of about 0.5 to 1.5 mm according to the size of the floating body 10 and the like.

Similarly to the skin 2, the skin 3 has a skin main body 31 formed in a hemispherical shape with a thin plate made of plastic, and a pipe 33 extending in the center direction of the sphere is integrally formed at the center thereof. The skin 3 may be manufactured by cutting the ribs 22 from the skin.

The core material 4 is formed into a sphere having a size corresponding to the inner volume of the skins 2 and 3 by a plastic independent foam material such as styrofoam or urethane foam.
A through-hole through which 23 and 33 penetrate is formed. The expansion ratio of the core material 4 may be set to about 50 times.

The core material 4 is covered with the skins 2 and 3 and the rib 22 is covered with the skin 3
Over the outer surface of the peripheral portion of the above, and the portion is bonded by means of an adhesive or high frequency bonding. At this time, the outer diameter of the rib 22 is contracted by using the notch 24 to make the rib 22 adhere to the skin 3. The pipes 23 and 33 abut each other, and the two pipes 23 and 33 form the rope guide 5 having a through hole. Also, apply an adhesive to the inner surfaces of the epidermis 2 and 3,
The skins 2, 3 and the core material 4 are adhered.

The skins 2, 3 may be colored or patterned according to the purpose of use. Alternatively, the outer skins 2 and 3 may be made of a transparent body, and the outer surface of the core material 4 may be colored or patterned, so that peeling of the pattern can be prevented.

The floating body 10 is usually formed in a size of about 250 to 3000 mm in diameter, but in any size, sufficient buoyancy is exhibited by the core material 4 made of plastic foam material, and the plastic skins 2 and 3 Since it is reinforced by the core material 4, it can be formed thin, so that a lightweight floating body 10 is formed as a whole. Further, since the rope guide 5 is formed to penetrate the floating body 10, the floating body 10 can be reliably locked. Further, since the skins 2 and 3 are formed of plastic molded products, it is easy to cope with various shapes and colors. Also, even if the skins 2 and 3 are torn in the event of a collision with drifting objects, there is no loss of buoyancy because the inside is made of independent foam, so the function as a floating body is not lost There is also.

(Effects of the Invention) As described above, the present invention forms a pair of hemispherical skins with ribs projecting from the peripheral edge thereof, cuts the ribs from one of the skins after the molding, and forms the other. The notch is formed in a part of the rib of the skin in the circumferential direction, so that one of the skin and the other skin can be manufactured by the same mold, so that the molding cost is reduced.

In addition, since each skin is covered while being bonded to a pair of hemispherical cores made of a plastic independent foam corresponding to the inner volume of each skin, one core and the other core can be manufactured with the same mold. Therefore, the molding cost is low, and the core material is hemispherical, and the outer dimensions are half that of the spherical material, so that the mold cost is low. In addition, since the skin is adhered to the core, seawater or the like does not enter the gap between the skin and the heart even if the skin is torn. Furthermore, there is no need to provide a hole for core material injection, and watertightness can be reliably maintained.

Furthermore, the end surfaces of the respective core materials are overlapped with each other, and the rope guide pipes of the respective skins are joined to each other, and the ribs of the peripheral portion of the other skin are fitted to the peripheral outer surface of the one skin, and the notch is used. The ribs are heat-shrinked to adhere to the outer periphery of one of the skins, and the fitting portion is adhered to form a spherical shape, so that the periphery of the pair of skins has a large area due to the heat shrinkage of the ribs. , And there is no possibility that seawater or the like will enter the inside from the fitting portion. Further, since the fitting portion is formed by overlapping two ribs of the rib and the peripheral portion of one of the skins, the strength is improved, and the ribs are edge-shaped like a brim and do not protrude largely outward, which is safe.

[Brief description of the drawings]

FIG. 1 is a central sectional view showing an embodiment of the present invention, and FIG. 2 is an exploded sectional view of its skin. 2,3 ... skin, 4 ... heart, 5 ... rope guide, 10 ...
... Floating body.

Claims (1)

(57) [Claims] 1. A pair of hemispherical skins made of a thin sheet of plastic and having ribs projecting from the periphery thereof are formed, and the ribs are cut from one of the skins and the circumferential direction of the ribs on the other skin. A notch is formed in a part of the core, and the respective skins are covered while being bonded to a pair of hemispherical cores made of a plastic independent foam corresponding to the inner volume of the respective skins. While overlapping each other, pipes for rope guides extending from each skin toward the center and penetrating each core material are joined to each other, and the rib on the peripheral edge of the other skin is fitted to the outer peripheral surface of the one skin, and then In addition, the ribs are heat-shrinked by using the notches so as to be in close contact with the outer peripheral portion of one of the skins, and the fitting portions are adhered to each other to form a spherical shape. Method for manufacturing a floating body for stopping.