JPH027977A - Game ball and molding method for game ball - Google Patents

Abstract

PURPOSE:To contrive a ball not to be hit and rolled far away as the game ball for a gate ball or the like on an indoor smoothed floor surface by composing the ball, of the urethane elastomer of material having an ultra energy absorbing action, and the like. CONSTITUTION:The material of urethane elastomer having an ultra energy absorbing action, or the like is half-split and after that, the split ones are connected to and combined with each other in a half-done state. When an external force is applied to this game ball, then the ball is lacking in elasticity, and the external force is absorbed as it is, and its section is temporarily recessed, and is deformed, and a repulsion to the external force is dull and low, and so the game ball is slow in working, but its directional property is exactly set. As this result, a purpose for the game of a gate ball or the like on an indoor smoothed floor surface is certainly accomplished, and at the time of coming into collision with the ball, any danger is not incurred at all to equipments, human bodies, and the like.

Description

DETAILED DESCRIPTION OF THE INVENTION A1 Object of the Invention (a) Industrial Application Field The present invention provides a competition ball suitable for gateball, which absorbs shock and has a landing part that maintains a flat surface during rotation and can be controlled at low speed. It is related to the molding method that is the manufacturing method.

b. Conventional technology and its problems Conventional competition balls are constructed from materials such as tree bark, rubber, plastic, and fiber.

Originally, balls are widely used for athletics, playground equipment, and industrial purposes, depending on the purpose of use, but most of them are elastic bodies that roll well and fly well when hit, and have excellent repulsion. required characteristics.

However, the present invention completely reverses the above-mentioned properties, and takes advantage of the characteristics of a ball that does not fly even when hit and is difficult to roll.

In particular, for gateball, in areas where it snows during the winter, the competition field must be moved indoors, and gymnasiums, assembly halls, warehouses, etc. are usually used as the competition venue. At that time, the competition scene is almost never on the ground (top surface), and is made up of flooring, concrete, asphalt, etc., so the rolling resistance of the ball is small, and the speed and rolling distance are increased beyond what is necessary with normal batting force. be. Because the ball itself is made of hard material, it can collide with walls and other surfaces, causing damage, and may hit players other than the batter, causing injury.

The competition ball of the present invention certainly satisfies the purpose of use for competition on smooth indoor surfaces, and at the same time does not cause any harm to the equipment or the human body in the event of a collision.

Considering these characteristics, I do not think that even more competition balls will be used. This is an attempt to solve the above-mentioned problems.

That is, the first invention is a competition ball made of urethane elastomer, which is a material with a super energy absorption effect, in a spherical shape, and the second invention is a ball made of a material such as urethane elastomer, which is made into a half-sphere shape, and then A competition ball is formed by combining these materials in a semi-finished state.

Example of b1 invention 1 is a competition ball of the present invention.

The material used is urethane elastomer, a material with super energy absorption properties.

This urethane elastomer is a material with excellent dimensional stability, very low permanent set, and very high energy absorption.

That is, it has characteristics such as vibration damping properties, energy absorption properties, restoration delay properties, and high distortion properties.

The main characteristics are shown below using test values.

Energy absorption rate: 95 zero Impact energy: 4a, 3 kg/m or less Street speed: 15 m/sec or less Hardness (JIS-8)
6゛(Test sample JLI aG”/+aφX 3(1”
By the way, this urethane elastomer is used in the insoles of shoes (especially in the heel area) to absorb shock, and to protect the knees and joints6.
In addition, it was used exclusively in the form of a plate for acoustic insulation, vibration prevention, noise prevention, etc.

Previously, it was thought that it was impossible to create a spherical shape with this material, and no one could even think of how to use it as a spherical shape. However, it has now been possible to create a spherical ball, and the ball is made of urethane elastomer.

Next, the molding method for producing a spherical shape, that is, a ball, consists of the following steps.

First Step: In order to obtain a molded product of urethane elastomer, it is necessary to cure it using a curing agent.

Therefore, we lowered the viscosity of the urethane elastomer, preheated it to a temperature suitable for curing +10 t, reduced the pressure to 511 g/ml or less to remove air bubbles in the urethane elastomer, and separately weighed out the required amount of curing agent in advance. Heat it to 120℃.

Conventionally, urethane elastomer molded products are cast all at once into a mold.

However, the mold 3 used in the manufacturing method of the present invention consists of two hemispherical molds 3A and 3B, which are combined to form a spherical shape with a well-centered spherical center. ,
The mold is cleaned, a mold release agent is uniformly applied, and the mold is preheated to 100°C.

Second Step After the above preparations are completed, the mixture II of the urethane elastomer and curing agent is continuously poured into the two molds separately using a urethane casting machine without entraining air bubbles.

The mixture II of urethane elastomer and curing agent injected into these molds turns into a gel at 110° C. and undergoes a hardening phenomenon.

Therefore, while carefully observing the curing phenomenon, we allowed the curing to proceed and applied a mixture of urethane elastomer and curing agent I to the needle tip.
Make sure that I can be caught with a thin 1-2 wooden thread, then quickly fit the hemispherical type 2 into one, and weigh 5kg.
A pressure of /cm2 and a temperature of 110°C are maintained to form a sphere.

3rd step: When the curing time without deformation (11i mold possible time) has elapsed, the molded product is removed from the mold, further aged in a heating oven, and then colored and decorated with a rubber-based colorant. Get a ball for.

C9 action Explain along with the effects.

C1 Effect of the invention a. Shock absorption When an external force is applied to the competition ball of the present invention, the competition ball, which has poor elasticity and is super flexible, absorbs the external force as it is, and that part temporarily dents and deforms, making it difficult to resist the external force. The repulsive force is slow and small, so the action of a competition ball is slow, but its direction is accurate.

In order to compare the repulsive force of the competition ball of the present invention and the conventional rubber ball, the ball was dropped from a height of 1 m, and the rebound was 100"/1.

Rubber ball 450/II.

Furthermore, since the competition ball itself has a high tensile strength and tearing force, it will not be damaged or destroyed, and its lifespan is more than 10 times that of conventional products.

51 Regarding the fact that a sphere always maintains a flat surface at the landing point, a competition ball is distorted by its own weight at the landing point to form a flat surface, and when it rolls away from the landing point, it returns to its spherical shape. That is, by rolling, a competition ball forms a flat surface and returns to a spherical shape in a continuous manner, and its reciprocation is slow.

As a result, the competition ball, which should be accelerated, is decelerated by the resistance, its speed slows down, and the distance it travels does not increase.

In the same way, a method was considered in which a polyhedron was created by cutting a cut surface on a spherical surface with the intention of creating a slow ball, but this method sometimes caused shooting when rolling, and one side of the polyhedron and the flooring surface did not match. It may turn into a slipping phenomenon, or
It lacks direction and halves the purpose.

On the other hand, a ball with a polymeric brush on its outer surface to slow down the speed was also considered, but this would cause hair loss during use, resulting in lack of durability and lack of directionality. In addition, placing a warm body inside a hollow ball,
Efforts have been made to slow down the rolling and shorten the rolling distance by adding an appropriate amount of granular solid particles, but to this day the objective has not been fully achieved.

Considering the above-mentioned characteristics, it is thought that it will be used for other types of competition balls besides gateball.

The function of the competition ball will be explained with reference to FIGS. 1 to 7.

Figure 1 shows the action of the competition ball. Figure 1a shows the competition ball 1 at a height of 1000"/, and Figure 1b shows the ball center of the competition ball that has fallen and landed. IA
is a stable position, the landing surface of the competition ball is in contact with the floor and is a flat surface, and the position of the center of the ball is closer to the floor than the planned position of the center of the ball, and the center of the ball is stationary. This shows a state in which the ffT impact of the falling load is stopped and absorbed, and the 1c
The figure shows a state in which the ball has jumped up to a height of 100''/1 from the state shown in FIG. 1b, and FIG. 2 shows the action of the conventional ball 2, while FIG. /.

Figure 2b shows a state in which the ball center 2A of the conventional ball 2 that has fallen and landed is in a stable position, and Figure 2c shows that the landing surface is in contact with the floor surface at a point. It shows that the ball has stopped and the position of the center of the ball is +o 117=m.

This means that the absorption of the impact of the falling load is assumed to be almost zero, and the rebound is 4.50"/, which is a whopping state.

Figure 3 shows a competition ball resting on the floor and distorted by its own weight.

Moreover, FIG. 4 shows a state in which the conventional ball has almost no distortion, and its installation with the floor surface can almost be considered as a point.

Figure 5 shows the effect in a gateball game.
The state of the ball just before being hit with the stick IB, the state of hitting the ball, and the state of the hit ball sufficiently absorbing the impact and rotating are shown in this order.

FIG. 6 is a plan view of FIG. 5.

Figure 7 shows the action of a competition ball, which is a front view of the ball just before it rolls.While it is rolling, it forms a distorted plane against the floor due to its own weight, and as soon as it leaves the floor, it quickly becomes spherical. These drawings demonstrate that the continuous operation of the 1-plane spherical and 1-spherical planes creates considerable resistance to running, and that the brakes are applied.

[Brief explanation of the drawing]

Figure 1 shows the action of a competition ball. Figure 1a is a front view of the competition ball at a certain height, and Figure 1b shows the competition ball falling and landing. Figure 1C is a front view showing the state in which the ball has stopped and absorbed the impact of the falling load. Figure 1C is a front view showing the state in which the ball has jumped up to a certain height from the state in Figure 1B. Figure 2 shows the action of a conventional ball. Figure 2a is a front view showing a conventional ball at a constant height, Figure 2b is a front view showing a ball with its center at a stable position after falling and landing. Figure 2C is a front view showing a ball that has fallen and landed and is hardly able to absorb the impact of the falling load. Figure 3 is a front view of a competition ball that is resting on the floor and is distorted by its own weight. Figure 4 is a front view showing a conventional ball with almost no distortion and can be considered as a dot when placed on the floor. Figure 5 is a front view showing a ball just before being hit in a gateball game. Fig. 6 is a plan view of Fig. 5, and Fig. 7 is a side view showing the state in which the ball is hit, and the state in which the hit ball sufficiently absorbs the impact and begins to rotate. Fig. 7 is a plan view of Fig. 5. It shows the action of the object, which shows the state where it is on the verge of rolling, the state where it is rolling and forming a distorted plane due to its own weight against the floor surface, and the state where it immediately forms a spherical shape and travels as soon as it leaves the floor surface. FIG. 8 is a schematic vertical sectional view showing the molding method. 1,,,ii Ball IA for technique, center of the ball.

Claims (1)

[Scope of Claims] 1. A competition ball characterized by having a spherical shape made of urethane elastomer or the like, which is a material with super energy-absorbing properties. 2. A method for molding a competition ball, which comprises forming a material such as the above-mentioned urethane elastomer into a half-sphere shape, and then joining and combining them in a half-baked state.