JPH05278150A - Pneumatic fender material and production thereof - Google Patents

Abstract

PURPOSE:To obtain a pneumatic fender material capable of being easily attached to the bow or the stern in spite of a pneumatic type so as to conform to the curved part thereof. CONSTITUTION:In a pneumatic fender material wherein a cylindrical body formed from a rubber layer reinforced by reinforcing cord layers 5, 6 is filled with compressed air in a hermetically sealed state, a contracted diameter part 2 whose diameter is throttled small is formed to at least one place of the intermediate part in the longitudinal direction of the cylindrical body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic fender and a method for manufacturing the same, and more particularly to a pneumatic fender that can be easily attached to a curved portion such as a bow or stern and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, a fender attached to a wall surface having a curved portion such as a bow or a stern of a ship has a V-shaped section or a tubular section formed by molding rubber so as to follow the curved section shape. The solid type was used. However, since this solid type fender has higher rigidity than the pneumatic fender, it has a drawback that the reaction force and the surface pressure generated at the initial stage of the collision are high.

On the other hand, the pneumatic fender formed in the shape of a hollow cylinder is rich in flexibility and therefore does not have the drawbacks of the solid type. However, since the repulsive force of the compressed air filled inside is large, there is a problem that the bending operation is difficult and it is not easy to attach to the curved wall surface. Therefore, the pneumatic fender is downsized, and a large number of these are arranged to be attached to the curved wall surface.

However, it has been unavoidable that it is troublesome to individually attach a large number of fenders and the cost is increased. In addition, as a conventional method for manufacturing a pneumatic fender, as a core material, a paper mold corresponding to the outer shape of the expected fender is manufactured in advance, and a rubber layer and a reinforcing cord layer are formed on the surface of the paper mold. Was laminated and vulcanized to form a hollow cylindrical fender. Further, after the vulcanization, the paper mold was designed so that steam was blown into the fender to dissolve it. For this reason, it is necessary to manufacture a mold for each different size and outer shape of the fender, and to manufacture the paper mold for each fender, and because work to remove the paper mold after vulcanization is added, productivity is increased. Was low and expensive.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a pneumatic fender that is pneumatic and can be easily attached along a curved portion such as a bow or stern, and its production with excellent productivity. To provide a method.

[0006]

A pneumatic fender according to the present invention that achieves the above object is formed from a rubber layer reinforced by a reinforcing cord layer into a cylindrical body, and the inside thereof is filled with compressed air and sealed. The fender of the type is characterized in that a reduced diameter portion having a small diameter is formed at least at one position in the longitudinal middle portion of the cylindrical body.

As described above, in the fender of the present invention, since the reduced diameter portion is formed at at least one position in the longitudinal direction of the cylindrical body, it is easy to bend with the reduced diameter portion as a bending point. Can be easily attached. Further, in the method for manufacturing a fender according to the present invention, at least two reinforcing cord layers are formed on a mandrel to form a cylindrical body made of an unvulcanized rubber layer in which the reinforcing cords are arranged so as to intersect the biases, A reinforcing cord is wound in a ring shape in the circumferential direction or a ring is attached to at least one position in the longitudinal middle portion of the outer circumference of the cylindrical body, and then the mandrel is pulled out, and then the inside of the cylindrical body is filled with compressed air. It is characterized in that the outer peripheral region excluding the annular reinforcing cord or ring is expanded in the radial direction and the expanded state is maintained to vulcanize the rubber layer.

As described above, a cylindrical body is formed on the mandrel by utilizing the reinforcing cord layers crossing each other with a bias, the mandrel is pulled out from the cylindrical body, and the cylindrical body is filled with compressed air. Since the parts other than the reinforcing cord winding part or the ring mounting part are expanded and vulcanized in that state, it is possible to mold without producing a paper mold for each fender and without using a mold. ..

[0009]

FIG. 1 is an overall view of a pneumatic fender according to an embodiment of the present invention, the upper half of which is shown in a cutaway view. Fender 1
Are formed in a hollow shape and are spaced at equal intervals in the axial direction.
Four expanded portions 3 are alternately formed between the reduced diameter portions 2 along with the reduced diameter portions 2 at the locations. In the outer shell of the fender 1, an inner layer rubber 4 made of rubber having excellent airtightness is arranged on the innermost side, and two reinforcing cord layers 5 and 6 bias the reinforcing cords 5a and 6a in the middle. The outer layer rubber 10 having excellent wear resistance and cut resistance is further laminated on the outer side of the outer layer rubber 10. In addition, the reinforcing cord layer 5,
The reinforcing cord 9 is annularly wound around the portion corresponding to the reduced diameter portion 2 in the circumferential direction. Furthermore, the reinforcing cord layer 5,
Both ends of 6 are folded back inward in the axial direction,
Sealing plates 7 and 8 are provided on the folded end portion of the flange 7 on the outer periphery.
It is mounted so that a and 8a are fitted together.

As the material of the cords used for the reinforcing cord layers 5 and 6, metal cords such as steel and organic fiber cords such as nylon, polyester and aramid are used. A ring made of metal or resin may be used as the reinforcing cord 9. Since the fender 1 of the present invention configured as described above has one or more reduced diameter portions 2 formed in the middle portion in the longitudinal direction of the cylindrical body, it has a curved portion as shown in FIG. At the time of attachment to a wall surface, the reduced diameter portion 2 can be easily bent at a bending point, so that the attachment becomes easy.

In order to further improve the effect of attaching to such a curved portion, when the radius of the curved portion is R, the fender outer diameter D, the fender length L, and the reduced diameter portion outer diameter D It is desirable to form D ′ such that D ≦ R D ′ = 0.4D to 0.8D L> 3D. Hereinafter, a method for manufacturing the pneumatic fender having the above structure according to the present invention will be specifically described.

As shown in FIG. 3, first, an unvulcanized inner rubber layer 4 is wrapped around the outer circumference of a cylindrical mandrel 11 serving as a core material, and an unvulcanized coated rubber is coated on the outside of the inner rubber layer 4. Cylindrical body 1'by stacking two reinforcing cord layers 5 and 6
To form. The reinforcing cord layers 5 and 6 are, as shown in FIG.
The reinforcing cords 5a of the one reinforcing cord layer 5 are arranged at an angle of 5 ° to 30 ° with respect to the axial direction, while the reinforcing cords 6a of the other reinforcing cord layer 6 are arranged in the axial direction. It is arranged on the opposite side to the angle of −5 ° to −30 °.

Next, the reinforcing cords 6 or rings are wound or mounted on the outer side of the reinforcing cord layer 6 in the circumferential direction so as to be orthogonal to the axial direction, and the reinforcing cords 9 or rings at predetermined intervals in the axial direction. .. Next, the upper and lower reinforcing cord layers 5,
Both ends of 6 are folded back so as to wrap the annular reinforcing cord 9 wrapped around both ends. Next, as shown in FIG. 5, the mandrel 11 is pulled out from the tubular body 1'formed as described above. The cylindrical body 1 ′ from which the mandrel 11 is pulled out retains its cylindrical shape due to the rigidity of the annular reinforcing cord 9. As shown in FIG. 6, disc-shaped seal plates 7 and 8 are provided on both ends of this cylinder, and their flanges 7a and
8a is press-fitted so as to fit.

An air filling valve 7a is provided on one seal plate 7.
Is provided, the valve 7a is filled with compressed air to radially expand the outer peripheral region excluding the reinforcing cord 9 as shown in FIG. At this time, the reinforcing cords 5a and 6a intersecting the biases of the reinforcing cord layers 5 and 6 are expanded uniformly without changing the intersecting angle and causing local bulging. And these reinforcement cords 5a and 6a
Should rest at an ideal angle of about ± 55 ° with respect to the axial direction.

When the expansion operation of the cylinder 1'is completed as described above, the unvulcanized outer rubber layer 10 is laminated as shown in FIG.
The outer rubber layer 10 is laminated so as to cover the flanges 7a and 8a of the seal plates 7 and 8 at both ends. Then, the tube body 1'is placed in an oven and vulcanized while maintaining its expansion, whereby the pneumatic fender 1 as shown in FIG. 1 is completed.

According to the present invention, when it is necessary to further reinforce the outer wall depending on the purpose of the fender, as shown in FIG.
The cord 13 for reinforcement may be wound around the outer periphery of the inflatable portion 3 in layers. When arranging the cord 13 in this way, after expanding the tubular body 1 ',
It is good to wind before laminating. Alternatively, the cylinder 1 '
May be wound around the cylindrical body before being expanded, but in this case, the reinforcing cord 13 is wound around a larger diameter in advance.

In the fender of the embodiment shown in the drawings, the inner rubber layer, the reinforcing cord layer, the outer rubber layer, etc. are shown thicker for easier understanding, but they are actually thinner. .. As described above, the manufacturing method of the pneumatic fender of the present invention,
After pulling out the mandrel from the cylindrical body formed on the mandrel using at least two reinforcing cord layers, the cylindrical body is filled with compressed air to expand the portion other than the reinforcing cord winding portion or ring mounting portion. It can be easily manufactured by vulcanizing in that state.

[0018]

As described above, in the pneumatic fender of the present invention, since the reduced diameter portion is formed at least at one position in the longitudinal middle portion of the cylindrical body, the reduced diameter portion is easily bent at the bending point. The mounting on the wall surface having the curved portion can be facilitated. Further, in the method for manufacturing the fender according to the present invention, after pulling out the mandrel from the cylindrical body formed by utilizing the reinforcing cord layers intersecting with each other on the mandrel in bias, the cylindrical body is filled with compressed air. By expanding the parts other than the reinforcing cord winding part or the ring mounting part and vulcanizing in that state, it is possible to mold without making a paper mold for each fender and without using a mold Becomes

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing a pneumatic fender according to an embodiment of the present invention.

FIG. 2 is a plan view showing a state in which the pneumatic fender of FIG. 1 is attached to a curved portion.

FIG. 3 is a schematic cross-sectional view showing a first step of the method for manufacturing a fender according to the present invention.

FIG. 4 is a plan view showing a part of the outer surface of the cylindrical body in FIG.

FIG. 5 is a schematic cross-sectional view showing the next step of FIG.

FIG. 6 is a schematic cross-sectional view showing the next step of FIG.

FIG. 7 is a schematic cross-sectional view showing the next step of FIG.

FIG. 8 is a schematic cross-sectional view showing the next step of FIG.

FIG. 9 is a schematic sectional view corresponding to the step of FIG. 8 showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fender 2 Reduced diameter part 3 Expansion part 4 Inner layer rubber 5,6 Reinforcement cord layer 7,8 Seal plate 9 Reinforcement cord 10 Outer layer rubber 11 Mandrel

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Claims (2)

[Claims] 1. A pneumatic fender, which is formed from a rubber layer reinforced by a reinforcing cord layer into a cylindrical body and is filled and sealed with compressed air, at least at one position in the longitudinal middle portion of the cylindrical body. Pneumatic fender with a reduced diameter that has a small diameter. 2. A cylindrical body made of an unvulcanized rubber layer in which at least two reinforcing cord layers are arranged on a mandrel so that the reinforcing cords intersect each other with a bias, and at least a longitudinal direction of the outer periphery of the cylindrical body is formed. An outer peripheral region excluding the annular reinforcing cord or ring is obtained by winding a reinforcing cord in an annular shape in the circumferential direction or attaching a ring at one location, then pulling out the mandrel, and then filling the inside of the cylindrical body with compressed air. A method for manufacturing a pneumatic fender, in which the rubber layer is vulcanized by expanding the rubber in a radial direction and maintaining the expanded state.