JPH0960346A - Sporting post, national flag hoisting tower, flag and clothes pole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lightweight post with a strength necessary for the sporting post by forming it of a fiber-reinforced composite material, and having strongness for bearing high bending moment. SOLUTION: This sporting post as a tennis net post comprises a main construction 1 formed of a fiber-reinforced composite material, a pulley part 2 for expanding the net and a wire winding part 3. As a main structural member, carbon fibers with a high elastic modulus having a specific tensile elastic modulus are used, and a seat prepreg using an epoxy resin as the matrix is molded in the shape of a pipe having a specific thickness, two hollow pipes with different calibers closely fitted to each other are fitted in a telescope type, and various kinds of necessary members are mounted to assemble the tennis net post. By this constitution, flexure can be controlled to the minimum extent, and as a long pole easily influenced by wind, it can be effectively used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to sports posts such as goal posts, net posts, and athletics posts, etc., which are light and strong and can be easily installed or removed, and flag posts and flags and clothes poles. Is.

[0002]

2. Description of the Related Art Conventionally, net posts used for tennis and volleyball and posts for sports such as soccer, baseball and athletics have been made of iron or stainless steel. In particular, the main structural portion for countering the bending moment that occurs when tension is applied to the wire of the net is made of a metal having a considerably large thickness due to the problem of strength.

[0003]

However, this thick metal net post is very heavy, and a physical burden is large when installing and removing the net post. Further, when it is premised on the use in a multipurpose place such as a gymnasium, unlike a dedicated tennis court or the like, it is frequently installed and removed. In addition, volleyball netposts are also long and therefore very heavy and physically distressing for installation and removal workers.

The present invention overcomes the above-mentioned drawbacks of the prior art and has the durability to withstand a large bending moment.
The present invention is to provide sports posts and flag hoisting towers, flags and clothes poles that are lightweight and easy to install and remove.

[0005]

The present invention adopts the following constitution in order to solve the above problems.
That is, the sports posts of the present invention are characterized in that at least the main structural portion of the posts is composed of a fiber-reinforced composite material, and the flag raising tower of the present invention is used for such sports. The post is characterized by constituting the pole of the flag hoisting tower, and the flag is
Such a sports post is characterized in that it constitutes a flag pole, and a clothesline is characterized in that it is constituted by such a sport post.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is eager to solve all serious defects of various conventional sports posts, such as being heavy and requiring manpower to carry, and being difficult to install and remove. It is what I examined. As a result, when a light and tough fiber-reinforced composite material, which has been mainly used for industrial buildings or transportation buildings, is adopted, it is clarified that the above-mentioned defects of the prior art can be solved at once. It is a thing.

In the present invention, the main structural portion means a structural portion configured to counter a bending moment generated when tension is applied to a wire of a net, or a structural portion configured to serve the purpose. Is something
For example, it means a portion in which a tube material of iron or stainless steel is used in a conventional net post.

As the fiber-reinforced composite material in the present invention, any fiber can be used as long as the fiber and the resin achieve the weight reduction by giving the fiber strength. Reinforced composite materials can be used, but for the purpose of the present invention, they are required to be lightweight and have high strength. As a fiber that achieves such an object, a high-strength fiber is preferable. That is, it is preferably a fiber having a strength of at least 10 g / d, more preferably at least 20 g / d. Further, since it is necessary to suppress the flexure of the support column to the same level as iron or stainless steel, high-strength fibers having a high tensile elastic modulus are used. The tensile modulus of the high-strength fiber that achieves such an object is preferably at least 5000 kgf / m 2.
m ² , more preferably 20000 kgf / mm ² or more is used. Further, as a method of further causing the bending phenomenon, the tensile modulus of elasticity is set to 3 on the outer tube side where the bending stress is concentrated by using a high-strength fiber having a higher modulus of elasticity, for example, graphitization.
It is particularly preferable to use carbon fiber (graphitized fiber) or the like which has been increased to the level of 0000 kgf / mm ² .

Such fibers are produced by a material element, a spinning method element, and a post-processing element. Aromatic polyamide fibers, carbon fibers, glass fibers, light metal fibers and the like can be used as the fibers of the material element. As the fiber of the spinning method element, a fiber produced by spinning a high molecular weight polymer as a raw material and then stretching at a high ratio, and as the fiber of the post-processing element, a fiber stretched while being exposed to radiation including plasma discharge. Etc. can be used, and the latter two methods are as follows.
Polyester fibers, polyamide fibers, polyolefin fibers, polyvinyl alcohol fibers, polyacrylonitrile fibers, etc. can be used. Among these fibers, for the purpose of the present invention, fibers having high strength and good heat resistance are preferably used from the viewpoint of thermal properties when molded into a composite material. From this point of view, carbon fibers (including graphite fibers) are particularly preferable.

The main purpose of such a fiber is to reinforce the post, and therefore, it is preferable to combine the fiber with a resin in a shape and structure in which the characteristics of the fiber are sufficiently exhibited. As for such a fiber shape and structure, the post is a sheet-like product made of the fibers, that is, a aligned sheet, a woven or knitted product,
A structure in which at least one kind of non-woven fabric is wound into a hollow shape is preferable. Specifically, for example, a filament-like product of the fibers is formed into a sheet-like product or a woven or knitted product, which is wound. Those having a rotated structure are preferable. In addition, as the filamentous material, it is possible to use a filament tape-shaped material having a structure in which a filament tape-shaped material is wound in a spiral shape and wound in a single or multiple layers. A fiber winding structure can be formed by using at least two kinds of the shaped materials together. That is, the fiber-reinforced composite material may be composed of a single or a composite fiber structure in which two or more kinds of fiber sheets are used in combination.

In order to enhance the strength of the post by utilizing the strength of the high-strength fiber, the sheet-like material or the fiber in the post has at least one component in the circumferential direction of the post. It is preferable to adopt a structure arranged in parallel, specifically a structure applied to a fishing rod.
Further, it is preferable that such a sheet-like material or fiber is subjected to a discharge treatment or a parent matrix resin treatment for the purpose of improving the adhesiveness with the resin.

As the matrix used in the fiber-reinforced composite material, lightweight metals such as aluminum are also used. However, for the purpose of achieving weight reduction, it is preferable that the specific gravity is small, and in that sense, the resin is Preferably used.
As such a resin, a natural resin may be used, but a high molecular weight synthetic resin is preferably used. Among such synthetic resins, it is preferable to use a thermosetting resin having excellent thermal and mechanical properties. Among these thermosetting resins, phenolic resins, epoxy resins, and unsaturated polyester resins are preferably used in terms of toughness and processability.

The sports posts of the present invention can be used as posts for supporting nets in golf driving ranges, baseball fields, etc., but it is important that they are strong and lightweight. It has a great feature that it is easy to install and remove. As the sports posts in the present invention, golf, baseball, tennis, volleyball, net posts used in badminton or table tennis, etc., further, soccer, rugby, American football, goalballs such as handball or hockey, further, The sports posts of the present invention include various posts used in athletics and various frames such as hurdles. INDUSTRIAL APPLICABILITY When the sports posts of the present invention are used as various posts for ball sports in a multipurpose place such as a gym where installation and removal are frequently performed, the effect of reducing physical pain during installation and removal is greatly exerted. To be done. As described above, the sports referred to in the present invention include game sports performed indoors and outdoors, and the posts include rod-shaped and frame-shaped items, and further various tools used for the game sports. It can be configured. Further, the post of the present invention can be effectively used as a flag raising tower and a flag pole that are long and easily affected by wind because the post can be suppressed from bending.

Next, the sports posts of the present invention will be described with reference to the drawings. FIG. 1 is a side view of a net post for tennis which is one of sports posts. In this example, a main structure part (main hollow tube) 1 made of fiber reinforced composite material and a net are spread. It includes a pulley portion 2 and a wire winding portion 3. FIG. 2 is a perspective view of a soccer goal made with the sports posts of the present invention. Similar to FIG. 1, it is composed of a main structural portion (main hollow tube) 1 made of a fiber reinforced composite material, and hollow tube portions 4 for various joints, and a net is stretched on this.

[0015]

The present invention will be described in more detail with reference to the following examples.

Example 1 A fiber reinforced composite material using a plain weave fabric made of carbon fiber filaments was prepared as a main structural member of a tennis net post. The carbon fiber has a tensile modulus of 30,000.
A sheet prepreg having a high elastic modulus of kgf / mm ² and an epoxy resin matrix was molded into a tubular shape having a wall thickness of 6 mm by the sheet winding method. Here, a rolling table method was adopted as the sheet winding method, and the laminated pattern was one in which the unidirectional prepreg was oriented in the directions of 0 ° and ± 45 ° with respect to the circumferential direction to achieve a balance in strength. This post is 0 ° and ± 45 °
The balance ratio in each direction was designed to be 4: 1, and the number of plies in each direction was determined. For the decoration, a sheet of 5 satin weave was used for the outermost layer. These sheet prepregs were first wrapped around a mandrel while applying a pressure of 3 kg / cm ^{2 on} a rolling table to be laminated, wrapped with a wrapping tape, and then cured at 130 ° C. in a curing oven.
Finally, the mandrel was pulled out to form a hollow tube. By this method, two hollow pipes with different pipe diameters that fit tightly are telescopically fitted, and the parts other than the main structural members, that is, the pulley part, the wire winding part, the lifting screw bolts and nuts are attached. Etc. were attached and the net post for tennis was assembled.

The outer diameter dimension and length of the hollow tube were finished to be the same as those of the steel tube which is the main structural part of the commercially available tennis net post manufactured by the prior art. Furthermore, commercially available products were attached to the pulley part and wire winding part, which are parts other than the main structure part. Thus, the tennis net post shown in FIG. 1 was manufactured.

This tennis net post was evaluated by the following two items with the tennis net post using the conventional steel pipe of Comparative Example 1 as follows. Item 1 is the weight, and item 2 is the inclination of the post from the vertical direction when tension is introduced into the net. Table 1 shows the evaluation results.

[0019]

[Table 1] As described above, the tennis net post according to the present invention is
Despite the weight being less than half, the inclination when the tension was introduced was small enough to have no problem in practical use and had sufficient strength.

Example 2 As a volleyball net post, a hollow tube having an epoxy resin as a matrix was manufactured in the same manner as in Example 1 using a plain woven fabric made of carbon fiber filaments. The hollow tube was also finished to have the same outer diameter and length as the steel tube, which is the main structural part of the commercially available volleyball net post made by the prior art. Furthermore, commercially available products were attached to the pulley portion and the wire winding portion, which are parts other than the main structure, to manufacture a volleyball net post.

This volleyball net post was evaluated in the same manner as in Example 1 with a conventional volleyball net post using a steel pipe of Comparative Example 2. Table 2 shows the evaluation results
Shown in

[0022]

[Table 2] As described above, the volleyball net post had a weight of 1/3 or less, but the inclination at the time of introducing tension was sufficiently small and practically no problem.

Example 3 In the same manner as in Example 1, a soccer goalpost was made of a hollow tube. The corner portion is a three-way L-shaped joint hollow tube, and three hollow tubes having different diameters are fitted to the inside of the tube to form a goal area and a depth portion. I made a soccer goal in the form shown in.

This soccer goal post is only 76 kg, compared to 229 kg of a conventional steel pipe.
It was only three times lighter. This goal post could be easily moved by a few children. Also, there was no fear of injury even if it fell down.

Example 4 In the same manner as in Example 1, a flag raising tower post was made of a hollow tube. The post had a tube outer diameter of 12 cm and a height of 6 m.

A comparison between this post and a conventional steel pipe post having the same size shows that the post of Example 4 has a weight of 7%.
The bending amount was 6 kg and the bending amount was 11 cm at a wind speed of 20 m / sec. On the other hand, the comparative product weighed 183 kg and 27 cm and was significantly heavy and easily bent. Example 5 In the same manner as in Example 1, a support flag post was made of a hollow tube. This post had a tube outer diameter of 7 cm and a length of 3 m.

A comparison between this post and a conventional steel pipe post having the same size shows that the post of Example 5 has a weight of 4%.
While the weight of the comparative product was 15 kg, the comparative product was 15 kg, which was three times heavier, difficult to swing, and was difficult to transport.

Example 6 In the same manner as in Example 1, a post for a clothesline was made of a hollow tube. This post has a pipe outer diameter of 3.5 cm and a length of 3.5 m.
I assumed that.

A comparison between this post and a conventional bamboo post of the same size shows that the post of Example 6 has a weight of 1.
The weight of the comparative product was 2.5 kg, which was almost twice as heavy as the weight of 3 kg.

[0030]

EFFECTS OF THE INVENTION The present invention having the above-mentioned structure has the following excellent effects.

(A) A significant weight reduction can be realized while maintaining the strength.

(B) As a post for sports, which requires frequent installation and removal, especially as a net post for tennis and volleyball, physical pain at the time of installation and removal can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a side view of a tennis net post which is one of the sports posts of the present invention.

FIG. 2 is a perspective view of a soccer goal made with the sports posts of the present invention.

[Explanation of symbols]

 1: Main structure part 2: Pulley part 3: Wire winding part 4: Hollow pipe part for joint

[Procedure amendment]

[Submission date] July 4, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction contents]

Next, the sports posts of the present invention will be described with reference to the drawings. FIG. 1 is a side view of a net post for volleyball , which is one of sports posts. In this example, a main structural part (main hollow tube) 1 made of a fiber-reinforced composite material and a net are spread. Pulley part 2
And a wire winding portion 3. FIG.
It is a perspective view of a soccer goal made with the sports posts of the present invention. Similar to FIG. 1, it is composed of a main structural portion (main hollow tube) 1 made of a fiber reinforced composite material, and hollow tube portions 4 for various joints, and a net is stretched on this.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction contents]

[0016] as the main structural member of Example 1 tennis net posts to prepare a fiber-reinforced composite material ing carbon fiber filaments. The carbon fiber having a high elastic modulus of 30000 kgf / mm ^{2 in} tensile elastic modulus was used, and a sheet prepreg containing an epoxy resin as a matrix was molded into a tubular shape having a wall thickness of 6 mm by a sheet winding method. Here, the sheet winding method adopts a rolling table method, and the laminated pattern has a unidirectional prepreg of 0 ° and ± 45 ° with respect to the circumferential direction.
Was oriented in each direction to obtain a balance in strength. This post was designed with a balance ratio of 4: 1 in the 0 ° direction and ± 45 ° direction, and the number of plies in each direction was determined. For the decoration, a sheet of 5 satin weave was used for the outermost layer. These sheet prepregs were first wrapped around a mandrel while applying a pressure of 3 kg / cm ^{2 on} a rolling table to be laminated, wrapped with a wrapping tape, and then cured at 130 ° C. in a curing oven. Finally, the mandrel was pulled out to form a hollow tube. By this method,
Telescopically fit two hollow pipes with different pipe diameters that fit tightly, and attach parts other than the main structural members, such as the pulley part, wire winding part, screw bolts and nuts for lifting , Assembled a net post for volleyball .

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction contents]

The outer diameter and length of the hollow tube were finished to be the same as those of a steel tube which is a main structural part of a commercially available volleyball net post manufactured by the prior art. Furthermore, commercially available products were attached to the pulley part and wire winding part, which are parts other than the main structure part. Thus, the volleyball net post shown in FIG. 1 was manufactured.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction contents]

This volleyball net post was evaluated by the following two items and a volleyball net post using a conventional steel pipe of Comparative Example 1. Item 1 is the weight and item 2 is the bending of the post when tension is applied to the net.
It is a characteristic. Bending characteristics are specified by the Product Safety Association.
Confirmation of certification standards for safety and quality of volleyball equipment
The method was used as a reference. First, keep the column height at 2430 mm
With the initial tension of 50kgf introduced,
Spread and stabilize for at least 1 minute. Next, based on this state
Then, apply a load of 200 kgf and hold for 1 minute or more.
After stabilizing, the amount of deflection was measured by a scale. Made
According to the certification standards of the Product Safety Association, 250kgf load is applied to a rigid support.
When adding, the amount of deflection must be 130 mm or less
Absent. Table 1 shows the evaluation results.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction contents]

[0019]

[Table 1] As described above, although the volleyball net post according to the present invention has a weight of 1/3 or less, the inclination at the time of introducing tension is small enough to cause no problem in practical use and has sufficient strength. there were.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0020

[Correction method] Change

[Correction contents]

Example 2 A carbon fiber filament was used as a net post for tennis .
A hollow tube using a reinforcing fiber and an epoxy resin as a matrix was manufactured in the same manner as in Example 1. The hollow tube was also finished to have the same outer diameter and length as the steel tube which is the main structural part of the commercially available tennis net post made by the prior art. Furthermore, for the pulley part and wire winding part that are parts other than the main structure part, attach commercially available ones,
I made a net post for tennis .

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction contents]

This tennis net post was evaluated for the following two items and a tennis net post using a steel pipe of the prior art which is Comparative Example 2. Item 1 is weight, item
2 is the post when the tension of the actual use level is introduced to the net.
Is the vertical tilt of the g. Table 2 shows the evaluation results.

[Procedure amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0022

[Correction method] Change

[Correction contents]

[0022]

[Table 2] As described above, the tennis net post had a weight of 1/3 or less, but the inclination when the tension was introduced was sufficiently small and practically no problem.

[Procedure amendment 9]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of drawings]

FIG. 1 is a side view of a net post for volleyball , which is one of the sports posts of the present invention.

FIG. 2 is a perspective view of a soccer goal made with the sports posts of the present invention.

Claims (20)

[Claims] 1. A sports post, wherein at least a main structural portion of the post is made of a fiber-reinforced composite material. 2. The sports posts according to claim 1, wherein the fibers constituting the fiber-reinforced composite material are high-strength fibers. 3. The sports post according to claim 2, wherein the high-strength fiber is a fiber having a strength of at least 10 g / d. 4. The sports post according to claim 2, wherein the high-strength fiber is a fiber having a strength of at least 20 g / d. 5. The high tenacity fiber comprises at least 5000 kgf.
The sports post according to claim 2, which is a fiber having a tensile elastic modulus of / mm ² . 6. The high tenacity fiber comprises at least 20000 k
The sports post according to claim 2, which is a fiber having a tensile elastic modulus of gf / mm ² . 7. The high-strength fiber is at least one selected from polyester fiber, polyamide fiber, polyolefin fiber, polyvinyl alcohol fiber, polyacrylonitrile fiber, light metal fiber, carbon fiber, and glass fiber.
The sports post according to claim 2, which is a kind. 8. The high-strength fiber is a carbon fiber.
The listed sports posts. 9. The sports post according to claim 1, wherein the post is constituted by a hollow wound structure of the fiber of the fiber composite material. 10. The sports post according to claim 1, wherein the fiber is a sheet. 11. The sports post according to claim 8, wherein the sheet-like article is formed by aligning filament-like articles. 12. The woven or knitted material is a sheet-shaped material.
The listed sports posts. 13. The sports post according to claim 8, wherein the sheet-like material is composed of at least two filamentous materials, a nonwoven fabric and a woven / knitted material. 14. A resin constituting the fiber-reinforced composite material,
The sports posts according to claim 1, which are thermosetting resins. 15. The sports posts according to claim 1, wherein the sports posts are net posts for golf, baseball, tennis, volleyball, badminton or table tennis. 16. The sports posts are goal posts for soccer, rugby, American football, handball or hockey.
Sports posts according to any one of. 17. The sports posts according to claim 1, wherein the sports posts are athletics posts. 18. A national flag hoisting tower, comprising the sports posts according to any one of claims 1 to 14, which constitutes a pole of the national flag hoisting tower. 19. A flag comprising the sports posts according to any one of claims 1 to 14 and comprising a flag pole. 20. A clothesline comprising the sports posts according to any one of claims 1 to 14.