JPH0519429B2 - - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a solid ball with high elasticity and a method for manufacturing the same, and relates to a solid ball with high elasticity that is generally commercially available as a so-called super ball. The present invention relates to a relatively small-diameter solid ball with high elasticity and a method for manufacturing the same, which is provided with patterns of various colors.

(Prior Art) This type of solid ball has heretofore been provided as a so-called super ball, which is made of synthetic rubber such as polybutadiene resin and has a relatively small diameter and high elasticity.

However, this ball is limited to a single color due to various constraints in its molding process. Therefore,
As a means of imparting a colored pattern to the ball surface, methods have been taken such as attaching a suitable colored material to the ball surface, or filling and solidifying a different colored ball material into the recesses carved into the ball surface. All of these had various drawbacks, such as a lack of permanence in the color pattern, and irregularities in the ball's surface, resulting in inconsistent bounce direction.

Therefore, in order to eliminate these drawbacks, the present applicant invented a solid ball that can be provided with a colored pattern that does not cause unevenness on any part of the surface, and a method for manufacturing the same, and this has been patented. (Patent No. 1185327). In this patent, a pair of hemispherical bowl-shaped half-split outer shells with perforated windows are spherically assembled in a holding mold, and an inner core material of a color different from that of the outer shell is placed inside the spherical outer shell. By injecting the material to form a solid ball and forming a colored pattern with the color of the outer shell of the ball and the inner core material exposed through the window holes of the outer shell, unevenness is created on any part of the surface. The present invention relates to a method of manufacturing a solid ball without a solid ball.

(Problems to be solved by the invention) However, the following problems remained in the applicant's previous patent.

In other words, this manufacturing method is limited to two types of combinations: the color of the outer shell body and the color of the inner core body exposed through the window holes of the outer shell body, so the combinations of colors that form the pattern are extremely limited. There was an inconvenience. For example, even if a pair of outer shell bodies are made to have different colors, the combinations are limited to a maximum of three colors, including the color of the inner core body. As a result, it was not possible to create patterns using a large number of colors, and there were few variations in color combinations.

Therefore, the present invention was created in order to solve the above-mentioned problems, and has the flexibility to freely use and combine a large number of colors without being restricted by the color of the inner core or the color of the outer shell. The purpose of the present invention is to provide a solid ball with high density and a method for manufacturing the same.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above-mentioned object, the solid ball with high elasticity of the present invention is provided with a window hole of an appropriate shape and a wall having an appropriate wall thickness with elasticity. A solid ball with high elasticity, which is formed by injecting and solidifying an inner core body with high elasticity into a hollow outer shell with high elasticity, which is different in color from the outer shell and has a plate shape with high elasticity, The press-fitting body installed in the window hole area on the inner surface of the outer shell is integrally press-fitted into the window hole by the injection filling pressure of the inner core body, and the outer surface of the window hole and the outer surface of the outer shell are formed into a smooth continuous surface. I will do it.

The manufacturing method consists of a first step of forming an outer shell with an appropriate wall thickness and a window hole made of a highly elastic material; a second step of installing a fluid press-fitting body material from the inner surface window hole portion of the outer shell near the periphery;
The outer shell with the press-fitting body installed inside is placed in a suitable holding mold, and the fluidized inner core material is injected into the holding mold from a specified press-fitting machine, and the filling pressure is applied to the inner surface of the outer shell. Means for solving the problem includes a fourth step of press-fitting the body material into the window hole, filling the holding mold with the inner core body material, and solidifying the outer shell body, the press-fit body, and the inner core body together. shall be.

(Function) According to the present invention, at the filling pressure of the fluid inner core material injected into the holding mold from a predetermined press-fitting machine,
The press-fitting body material installed on the inner surface of the outer shell is press-fitted into the window hole, and the outer shell, the press-fitting body, and the inner core are solidified together.

an outer shell having an appropriate wall thickness and having a window hole drilled therein;
The outer surface of the press-fit body material press-fitted into the window hole is molded into a fixed shape within the holding mold, and becomes a smooth continuous surface with no unevenness in any of the color patterned parts of the surface.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

Reference numeral 1 shown in the figure is an outer shell body having a predetermined wall thickness, and a window hole 2 of an appropriately shaped shape is bored in this outer shell body 1. In the illustrated example, a half-sphere shape is used, but it may be formed smaller than this, for example, the outer shell 1 may be about one-third the size of a predetermined sphere. The shape of the window hole 2 corresponds to the shape of the color pattern applied to the ball, and the hole 2 is opened in an appropriate shape, such as forming a window hole 2 with a number pattern as shown in the figure, and the number thereof is not limited. .

An inner core body 3 is press-fitted and solidified into the core portion of the ball, and a press-fit body 4 made of a molded member having a color different from that of the outer shell body 1 is inserted into the window hole 2 of the outer shell body 1 as the inner core body 3 is press-fitted. It is then further press-fitted and solidified. The outer shell body 1, the inner core body 3, and the press-fit body 4 are integrated, and the outer surface of the press-fit body 4 exposed from the window hole 2, the outer surface of the outer shell body 1, and the outer surface of the press-fit body 4 are smooth. It is a continuous surface with a spherical shape.

The outer shell body 1, the window hole 2, and the press-fit body 4 are all made of a highly elastic material, for example, synthetic rubber such as polybutadiene resin. At this time, the colors of the outer shell body 1 and the press-fit body 4 are different, but the color of the inner core body 3 is as follows.
It does not necessarily have to be different from the outer shell body 1 or the press-fit body 4. For example, the outer shell body 1 and the inner core body 3 may be of the same color, or as shown in the example, the outer shell body 1, the inner core body 3, and the press-fit body 4 may have different colors.
The inner core body 3 may be made to have a different color from the outer shell body 1 and be exposed from some of the window holes 2 by making the colors of the press-fit body 4 and the press-fit body 4 different.

Next, the manufacturing method includes the following four steps. That is, as shown in FIG. 3, a suitably shaped window hole 2 is formed in a highly elastic material.
A first step of forming an outer shell body 1 having an appropriate wall thickness with a hole drilled therein, and forming an outer shell body 1 having an appropriate wall thickness and a color different from the outer shell body 1 from the inner surface window hole 2 portion of the outer shell body 1 to the vicinity of the periphery. The second part is placed in contact with the fluidized press-fitting body 4 material.
a third step of placing the outer shell body 1 with the press-fitting body 4 installed therein into an appropriate holding mold Q; and a fluid inner core body 3 that is press-fitted into the holding mold Q from a predetermined press-fitting machine P. Due to the pressure of the material, the press-fit body 4 material installed on the inner surface of the outer shell 1 is press-fitted into the window hole 2, and the inner core body 3
The fourth step consists of filling the holding mold Q with the material and solidifying the outer shell body 1, the inner core body 3, and the press-fit body 4 together.

In addition, in the fourth step, from the press-fitting machine P to the holding mold Q
The press-fitting of the inner core body 3 material into the inside is carried out several times, and at this time, in the second step, the air remaining in the window hole 2 is removed from the outer surface of the outer shell body 1 by pressing the holding mold Q. It is extracted through the surface.

[Effects of the Invention] According to the present invention, the press-fitting body 4 installed in contact with the window hole 2 in the outer shell 1 is injected into the outer shell 1 into the window hole 2. The core body 3 is integrally press-fitted by the injection and filling pressure of the inner core body 3, and
The outer shell body 1 and the press-fit body 4 have different colors, and by selecting the press-fit body 4 itself, the color of the press-fit body 4 can be arbitrarily changed.

Therefore, by appropriately changing the number of holes 2 formed in the outer shell 1 and the material of the press-fit body 4 press-fitted into the window holes 2, it is possible to freely combine a large number of colors.

Moreover, since it is possible to add the color of the inner core body 3 to the color combination of the outer shell body 1 and the press-fit body 4, these variations are extremely diverse, and there are many variations that could not be achieved before. You can create various color patterns.

on the other hand. In this manufacturing, the outer shell 1 obtained in the first step is formed, and the press-fit body 4 installed in the second step is formed.
Since the material is press-fitted into the window hole 2 in the third and fourth steps to integrate these outer shell bodies 1, 2, and 4, after being integrated, these outer shell body 1, inner core body 3, and press-fit body 4 are connected to each other, and even when a recoil impact force is applied during play, the ball does not separate, and the integrity of the ball is ensured. At the same time, since the outward opening surface of the window hole 2 coincides with the inner surface of the holding mold Q, the window hole 2
To ensure the shape of a smooth continuous surface between the outer surface of the press-fit body 4 and the outer surface of the outer shell body 1 exposed from the outside.

As explained above, according to the present invention, not only can a large number of colors be freely used and combined without being restricted by the color of the inner core body or the color of the outer shell body, but also it is suitable for mass production. It is highly effective and can be provided at low cost, making it an excellent cost-effective product.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a front view of the product, FIG. 2 is a sectional view thereof, and FIG. 3 is a sectional view of the inner core material in a state of being injected in the manufacturing method. Q...Holding type, P...Press-in machine. 1... outer shell,
2...window hole, 3...inner core body, 4...press-fit body.

Claims (1)

[Scope of Claims] 1. A highly elastic solid body made by injecting and solidifying a highly elastic inner core into a highly elastic hollow outer shell having an appropriately thick wall and having an appropriately shaped window hole bored therein. In the ball, a press-fitting body, which has a plate shape different in color from the outer shell body and has a high elasticity, and is installed in the window hole area on the inner surface of the outer shell body, is inserted into the window hole by the injection filling pressure of the inner core body. A highly elastic solid ball characterized by being integrally press-filled and having a smooth continuous surface between the outer surface of the window hole and the outer surface of the outer shell. 2. A first step of forming an outer shell having an appropriate wall thickness with window holes made of a highly elastic material;
A second step of installing a fluid press-fit material having an appropriate wall thickness and a color different from that of the outer shell from the inner surface of the outer shell to the vicinity of the window hole, and a step of installing the outer shell with the press-fit body installed inside. It is placed in a suitable holding mold, and the press-fitting body material placed on the inner surface of the outer shell is press-fitted into the window hole using the filling pressure of the fluid inner core material that is injected into the holding mold from a predetermined press-fitting machine. A method for manufacturing a solid ball with high elasticity, further comprising a fourth step of filling the holding mold with the inner core material and solidifying the outer shell, the press-fitting body, and the inner core together.