JP2513760Y2 - Float - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a lightweight, high-strength, and highly durable float, and more particularly to a float for fishing and the like.

"Conventional technology" In the cross-fishing or purse seine fishing, the position of the net is determined and the float attached to the rear rope end or one end of the net is dropped from the hull, and the length of the ship is about 1 km. Move to form a square or rhombus and insert a net.

After that, after the ship reached the position where it first dropped the float,
The float is pulled up on the ship and caught on the towing net.

The float serves as a mark as well as prevents subsidence at the end of the net, and generally the required buoyancy of the float is 1 ton.

So-called barrels were used from the early Taisho era when the fishing industry began to float around until just recently, but recently they have been used as Styrofoam protected by a canvas cover or float-foam floaters made of air-expandable rubber.

"Problems to be solved by the device" However, although the styrene foam float is inexpensive, φ0.8m x 1.1mL (buoyancy 500kg) is the maximum size due to manufacturing restrictions, and to obtain 1 ton buoyancy It is necessary to connect two. The weight per unit is around 20kg, which is a merit of light weight, but it is not so strong in terms of strength. When used in stormy weather, the float is 30 to 50m, sometimes 100m.
It may be pulled into the sea, and even if it is protected with a canvas cover, the compressive strength is around 2 kgf / cm ² , so it easily crushes, and when it is pulled up from the sea, it often hits the hull and is damaged. Is hard to say.

The air-expandable rubber float is made by stacking several layers of unvulcanized rubber sheet and a so-called unvulcanized rubber sheet on both sides of nylon woven fabric, which is a strength member, to form a hollow body. It is manufactured by integrating sulfur, and is used by inflating it by expanding it from the die attached to the hollow body.

As a method for manufacturing a hollow body, a method of forming a hollow body divided portion in a wooden mold and then releasing the die and adhering the divided portion, or setting a hollow body laminated product in an outer shape that can be divided and making it hollow by air or nitrogen gas There is a method of expanding the body in a mold and vulcanizing it and then taking it out.

If the wall thickness of the air-inflatable rubber float is too thin, there is a risk that it will burst due to large deformation when a through hole is opened by a protrusion during handling or when it is drawn into the sea. It is thick. Also,
The inflatable rubber float is subjected to an internal air pressure of about 0.5 kgf / cm ² to maintain its shape, that is, to ensure buoyancy.

The inflatable air comb made float has no problem in terms of strength as compared with the styrene foam float,
In the case of a φ1.0m × 1.5mL 10mmt float, the buoyancy is about 1 ton, but its own weight is about 80kg, which is disadvantageous in that it is heavy to pull from the sea.

Therefore, as a float for fishing, it is desirable to use a lightweight float such as a Styrofoam float and a durable float such as an air inflatable rubber float.

Furthermore, the float is wrapped with a rope net called "Leggo" in use, and the net and the fishing net are connected to each other, so that the float floating on the sea is rubbed on the surface with a net rope so as to be free.

Although Styrofoam floats are protected by a canvas cover, they are not suitable for fishing due to their poor abrasion resistance. The reason why the air inflatable rubber float is thick and heavy is that it is designed so as not to be damaged by abrasion in a short time even if it is rubbed with a net rope a little.

In view of the above, the present invention provides a float for fishing and the like that is lightweight, has high strength, and is highly durable.

[Means for Solving the Problems] That is, the present invention relates to a float in which an air chamber made of a flexible membrane is wrapped with a woven fabric so as to circumscribe the air chamber. The float is characterized in that the tensile strength of the woven fabric is at least twice the tensile strength.

 The present invention will be described in detail below.

The float according to the present invention comprises a thin and lightweight airtight bag body (1) for maintaining buoyancy, which is an air chamber made of a flexible film, and a woven cloth wrapped to circumscribe the air chamber as shown in FIG. It is composed of a reinforcing bag body (2) which is a strength member, and the expansion strength of the woven fabric is twice or more the expansion strength of the flexible membrane. It is important that the airtight bag has the same size as the reinforcing bag or slightly larger (about 3 to 5 mm in diameter). Note that (3) is a base.

"Action" Radius in the case of a design example of a spherical float with a buoyancy of 1 ton
It becomes 63 cm, and the stress δ generated in the bag can be calculated from δ = PR. The internal pressure for maintaining the buoyancy is given by putting air, nitrogen gas, carbon dioxide gas or the like in an airtight bag, and the lower the internal pressure is, the smaller the generated stress is, and it is safe even in case of rupture. An internal pressure P of about 0.1 kgf / cm ² is sufficient to maintain the shape of the float (maintain buoyancy), and the stress at this time is δ = 0.1 × 63 cm = 6.3 kg / cm.

The airtight bag may be made of any material including a plastic film as long as it is airtight and has a strength of 6.3 kg / cm or more, but a flexible film such as a rubberized cloth is preferable.

Airtight bag of spherical float with a radius of 63 cm, thickness 0.4 mm, mass 5
If it is made of rubberized cloth with 00g / m ² and expansion strength of 36g / cm, the airtight bag alone has a safety factor of 5.7 times and the mass is about 2.7kg in calculation.

The airtight bag body is for maintaining buoyancy and is a thin film body, so if it hits a protrusion, it is likely to cause an accident such as a hole being pierced or rubbed and broken.

The gas pressure in the airtight bag is about 0.00 for a temperature change of 1 ° C.
There is a variation of 4 kgf / cm ² . 0.1kgf / c under 0 ℃ environment in winter
float that inflatable to a pressure of m ² is the internal pressure when a to decrease the temperature of -20 ° C. decreased to 0.02 kgf / cm ^2, since the shape maintaining float becomes difficult, inflatable pressure 0.2kgf It is necessary to keep about / cm ² .

At this time, the safety factor of the airtight bag will be reduced by 2.86 times. Further, when 0.2 kgf / cm ² to plenum been float to 70 ° C. temperature rise in summer, the internal pressure is increased to 0.48kgf / cm ^2, the safety factor of the airtight bag at this time decreases 1.20 times.

Therefore, the float is greatly affected by the pressure fluctuation due to the fluctuation of the outside temperature, and the safety factor fluctuates, and it is difficult to put the floater to practical use only from this point.

As described above, the present invention provides a float of light weight, high strength and high durability by combining a thin and lightweight airtight bag that gives buoyancy and a reinforcing bag that is a strength member.

A high-strength fiber woven fabric such as an aramid fiber woven fabric or a super-strength polyethylene fiber woven fabric is suitable as a material for the reinforcing bag, and is manufactured by sewing according to the airtight bag fabric size.

For example, if a super strong polyethylene fiber fabric (trade name: TECMILON fabric PT 837) is used as the reinforcing bag material, this fabric will weigh
215 g / m ² , thickness 0.52 mm, and expansion strength 92.4 kg / cm, so if you make a spherical bag with a radius of 63 mm and apply an internal pressure of 0.2 kgf / cm ² to the airtight bag, the safety factor of the reinforcing bag is 7.33 times and internal pressure 0.48
Even if the pressure rises to kgf / cm ² , the safety factor of the reinforcing bag can be kept 3.05 times. The mass of this reinforcing bag is about 1.3 kg, considering the overlapped area of the sewing part, and the mass of the float is about 4 kg, which is extremely lightweight.

The role of the reinforcing bag is not only to be a strength member against the internal pressure of the float but also to prevent the airtight bag from being rubbed by the rope net.

Of course, even if the reinforcing bag is made of a flexible film in which a material such as rubber is coated on a high-strength fiber fabric, or is made of rubber or a flexible film on the outer surface of the reinforcing bag to further increase the safety factor. It goes without saying that a structure in which the above-mentioned bag is covered falls within the scope of the present invention.

[Examples] Examples of the present invention will be described below.

A rubber-coated cloth having a thickness of 0.4 mm, a mass of 500 g / m ² and an expansion strength of 36 kgf / cm was used, and the entire plate was divided into 8 panels (11) having end plates (10) of φ250 mm (d) at both ends. Two airtight bags shown in FIG. 2 (a) were attached to each other to manufacture them. The laminating overlap was 20 mm. (12) is the bonding section, (1
3) is the base. Note that D = φ1260 mm.

Tecmilon woven fabric (super-strength polyethylene fiber woven fabric) with a thickness of 0.52 mm, a mass of 215 g / m ² , and an expansion strength of 92.4 kgf / cm has a φ200 mm end plate part (20) and has eight panels (21) as a whole.
Two reinforcing bags shown in FIG. The sewn part (22) was sewn in 5 rows of 25 mm overlap with folded nylon thread. During the sewing process, the end plate portion was sewn together lastly, and the airtight bag was inserted into the reinforcing bag before this sewing. (23) is a mouth hole. Note that (d ') = 200 mm (D') = 1260 mm.

0.2 kgf / cm ² at the factory air from the mouthpiece attached to the airtight bag
It was filled up with air, and it was confirmed that there was no leakage, and the dimensions were measured.
Buoyancy was calculated from the volume. One of the two is hydraulically broken,
One was wrapped with a net woven with a 10 mm diameter rope at intervals of 10 cm, floated in a water tank, and was subjected to vertical vibration with a swing of 100 mm once a second for 2000 times to examine the degree of wear of the airtight bag.

 The test results were good as shown in Table 1.

[Result of Invention] As described above, according to the present invention, a float that is lightweight, has high strength, and is highly durable can be obtained, and is particularly suitable for a float for fishing.

[Brief description of drawings]

FIG. 1 is a sectional view of a float of the present invention, FIG. 2 is a perspective front view for explaining an embodiment of the present invention, FIG. 1A is an air chamber, and FIG.
Exemplifies woven fabrics that wrap around the air chambers so as to be circumscribed. (1) ... Air chamber (airtight bag) made of flexible membrane, (2)
...... Woven fabric (reinforcing bag) wrapped so as to circumscribe the air chamber

Claims (1)

(57) [Scope of utility model registration request] 1. A float in which an air chamber made of a flexible film is wrapped with a woven fabric so as to be circumscribed by the air chamber, and the tensile strength of the woven fabric is greater than the tensile strength of the flexible film. Is more than double.