JPS593040Y2 - fender - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a fender made of low foam polyolefin.

Conventionally, most of the fenders for ships, especially for small fishing boats, have been made of wood, but wooden materials do not have sufficient durability against water and abrasion, and are difficult to process from lumber and attach to the ship's hull. The disadvantages are that it requires skill and a lot of work, and that the wood used is relatively expensive, as the wood used must be of high quality, such as dense seed material and rods with few knots.

The inventor of the present invention attempted to use a plastic molded product as a fender for ships in order to eliminate all of the drawbacks of wooden fenders as described above.

However, molded bodies made of vinyl chloride, ABS, etc., for example, have not always been able to satisfy the various properties required for fenders, such as impact resistance, flexibility, weather resistance, and low temperature resistance.

However, low foaming polyolefin, especially the foaming ratio of 1.5
It has been determined that high-density polyethylene with a density of ~3 times as high as that of polyethylene has all the properties required as a fender material.

On the other hand, fenders are generally attached to the ship's hull by fastening them with bolts.

However, with this method, there are many problems such as work hazards at the bolt attachment part, damage to the rope net, water intrusion, corrosion of the bolts, and deterioration of the appearance of the hull, and various methods have been devised to solve these problems. being done.

For example, in the case of wooden fenders, double holes are drilled in the fender so that the bolt heads do not protrude from the surface, the bolts are inserted and tightened, and truncated conical wooden plugs are driven in to seal the bolt holes. block,
Next, the portion of the faucet that protrudes from the surface is subjected to cutting treatment.

Using a faucet is not preferable as it requires a lot of work, but wooden fenders fit snugly into the bolt holes and are easy to use unless the faucet shrinks and loosens over time or rots away. This method is generally used because it does not separate.

The low foam polyolefin fender proposed by the inventor of the present invention is also attached to a ship's hull by fastening with bolts, but this also has the disadvantage that it is easily detached from a faucet due to the characteristics of polyolefin.

The inventor of the present invention attempted to seal the bolt holes with a thermosetting putty to replace the faucet, but it took a long time to harden, the aesthetics were damaged, and the putty deteriorated over time. shrink,
It has also been found that it has drawbacks such as being prone to cracking, resulting in the creation of gaps and easy falling off.

The inventor of the present invention sought to improve the material and structure of the bolt hole plug in order to take advantage of the excellent properties of low-foam polyolefin, especially high-density polyethylene with an expansion ratio of about 1.5 to 3 times, as a fender material. After repeated studies, the present invention was completed after discovering that particularly excellent effects can be obtained by using a plastic stopper with a specific structure, especially a high-density polyethylene stopper.

That is, the present invention relates to a fender material with bolt plugs characterized in that the fender frame with bolt holes is made of low foam polyolefin and the plugs for the bolt holes are made of plastic. If it is made of high-density polyethylene, which is 1.5 to 3 times as thick, it has the most suitable characteristics as a fender.

The material made of high-density polyethylene with a foaming ratio of 1.5 to 3 times is lightweight, easy to color, and has mechanical properties such as elasticity, flexibility, abrasion resistance, impact resistance, and compression resistance. It also has excellent water resistance, chemical resistance, weather resistance, and cold resistance, and has extremely good properties as a fender material.

The low-foam polyolefin fender used in the present invention can be obtained by various extrusion molding techniques as long molded bodies with various sizes, shapes, and colors designed with consideration to the structure and aesthetics of the ship.

Bolt holes for attaching to the hull are bored in this molded body at various locations to form a fender with bolt holes.

On the other hand, there is a need for bolt hole plugs that fit snugly into the bolt holes of low-foamed polyolefin fenders, are difficult to fall off, are easy to install, and can be colored the same as the fender. There is.

As a result of further detailed study of the structure of the bolt hole plug, the present inventor found that a very favorable result could be obtained with a dome having a cross section as shown in FIG.

That is, the stopper 1 is essentially a dome with a U-shaped cross section,
The outer surface of the frame has several ribs 2, the outer diameter a of the ribs is about 2 to 4% larger than the large diameter d of the bolt hole 3, the outer diameter C of the plug is smaller than the large diameter of the bolt hole, and the inner diameter d is the diameter e of bolt head 4
The depth f is larger and does not touch the upper surface 5 of the bolt head 4 after plugging, nor does the upper surface 6 of the dome protrude onto the surface 7 of the fender.
A structure having the following is preferable.

The number of knobs may be one, but preferably a plurality of knobs, particularly 2 to 4 knobs.

Further, for the aesthetics of the hull, it is desirable to obtain a plug of the same color as the fender, but in this case, it is preferable to use a plug made of the same material as the fender, which is relatively easy to color match.

It is preferable to use the same type of material as the fender from the viewpoint of durability.

Among the low-foamed polyolefins proposed by the present inventor, when using high-density polyethylene fenders with an expansion ratio of approximately 1.5 to 3 times, it is preferable to use injection molded high-density polyethylene as the plug. In general, it is preferable that the fit between a plastic plug and a fender made of low foam polyolefin be such that there is an appropriate difference in the structure of the plug, as well as the rigidity, hardness, etc. of the two.

According to experiments, the rigidity and hardness of low-foaming extruded products decrease approximately in proportion to the expansion ratio, and the elasticity and flexibility increase.

A plug made of high-density polyethylene exhibits favorable fitting properties for a fender made of high-density polyethylene, which can have an expansion ratio of 1.5 to 3 times.

In other words, a high-density bot ethylene plug with a ribbed structure on the outer surface of the plug is easy to plug because the low-foamed polyolefin fender material has appropriate hardness and elasticity, and the rib part fits into the bolt hole after driving. It bites into the inner wall and does not fall off easily.

Furthermore, if the steel frame is designed to match the depth of the bolt holes,
Unlike in the case of water faucets, there is no need for cutting or the like after the faucet is turned on, resulting in a significant reduction in man-hours.

A specific example of the fender with bolt hole plugs of the present invention is shown below.

High-density polyethylene fender material with a foaming ratio of 2 times is extruded.

The fender is a long rod-shaped body with a length of 4 m and a cross section shown in FIG. 1.

Base of cross section: 100mm, top: approximately 80mm, height: 5Q m
It is m.

The bolt holes are provided at intervals of 250mm, and are in two stages as shown in Figure 1, 3, with the large diameter being 3Qmm and the small diameter being 12m.
m, and the depth of the large diameter portion is 3Qmm.

The bolt hole plugs are integrally molded from high-density polyethylene by injection molding.

The stopper is a dome with a rib around the U-shaped cross section shown in FIG. 1A.

The outer diameter a of the rib is 31 mm, the outer diameter C of the fornix is 28,2 mm,
Height f17mm, inner diameter d25. omm, the number of ribs is 4, and the ribs are provided around the entire circumference of the fornix at right angles to the axis of the fornix.

The fender is fixed to the hull with bolts, the plug is placed in the bolt hole, and the plug is lightly hammered in with a hammer or the like until the top of the dome is flush with the surface of the fender.

In this case, if you apply thermosetting filler putty to the rib grooves on the side of the frame in advance, the putty will penetrate into the foamed gaps in the fender and harden, allowing the plug to be more firmly fixed in the bolt hole. .

[Brief explanation of the drawing]

FIG. 1 shows a cross-sectional view at the center of the frame of a fender with bolt plugs. In the figure, 1 is the plug, 2 is the rib, 3 is the bolt hole, 4 is the bolt head, 8 is the fender, a is the outside diameter of the rib, b is the large diameter of the bolt hole, C
is the outer diameter of the plug, d is the inner diameter of the plug, e is the diameter of the bolt head, and f is the height of the plug.

Claims (1)

[Scope of utility model registration request] The fender with bolt holes is made of high-density polyethylene with a foaming ratio of 1.5 to 3 times, and the plugs for the bolt holes are made of high-density polyethylene, with a dome structure that essentially has a U-shaped cross section and outside the frame. 1. A fender with a bolt-substitute plug, characterized in that it has one to several ribs on its side surface, and the outer diameter of the rib is about 2 to 4% larger than the large diameter of the bolt hole.