JPS59207165A - Ball and production thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a synthetic resin molded ball with a built-in core ball for ball games, such as a ball for gateball, a golf ball for training W, and a billiard ball for popular use, and a method for producing the same. It is something.

For balls with a built-in core ball, the core ball is made of waste materials to save materials, and depending on the purpose, the core ball is made of heavy or elastic material, which is then molded with synthetic resin and impregnated with gold. However, conventional products have the disadvantage that the core ball and its epithelium tend to separate and deform during use, resulting in poor orientation of the ball and easy breakage.

Unfortunately, when producing such a ball, it is best to hold the core ball in the center of the entire mold and injection mold the synthetic resin around it, or to place the core ball in the center of the entire mold. It is difficult to hold, the directionality is worse due to uneven thickness of the skin due to eccentricity, and the service life is shortened.

In addition, when displaying numbers or other signs on the surface of the ball (such as balls used for gateball, etc.), the surface (5C) is easy to peel off when written directly on the surface, and the mark is engraved and placed in the recess. Although it is natural for objects filled with paint or the like to roll, they have the disadvantage of poor directionality when rolling. The purpose of this invention is to provide a ball that is extremely strong, has good directionality, and can withstand long-term use.

Still another object of the present invention is to provide a method for easily holding the core ball at the center of the ball and improving the productivity of balls that move at the desired speed.

The ball according to the present invention is characterized in that a plurality of concave holes are formed in the core ball built in the core part, and a part of the synthetic resin of the epithelium is infiltrated into the concave holes. It is.

That is, as shown in FIGS. 2 and 3, the core ball 1
If a plurality of concave holes 2 are bored in the core ball 1 and a synthetic resin is injection molded on the peripheral surface of the core ball 1, this flowing synthetic resin forms the epithelium 3 and at the same time, a portion of the resin flows inside the concave holes 2. The core ball 1 is very firmly connected to the epithelium 3 due to the hardening (C).

The recessed holes 2 may be bored parallel to each other as shown in the illustrated example, or they may be bored radially or in any other direction to a certain depth. It is also a preferable embodiment to form a through hole through the hole.

Further, as shown in the illustrated example, a number or other marker 4 molded in a color different from that of the epithelium 3 may be displayed on the surface of the epithelium 3 and embedded in such a manner as to extend rL.

Next, in order to produce such a ball, a method is used in which the core ball is held in the core part of the mold and synthetic resin is injection molded on the peripheral surface of the core ball. A guide inclined groove for a holding slide pin disposed oppositely to the mold is bored, and a guide member corresponding to the outer peripheral surface of the ball epithelium to be molded is inserted, and the guide inclined groove is formed in the slide pin. The core ball is pushed into the mold along with the core ball, the guide member is held in contact with the inner surface of the mold, and after the mold clamping is completed, the synthetic resin is injection molded.

Furthermore, as shown in the illustrated example [D], the plurality of concave holes 2 described above and the guide inclined grooves 7° 7 of the holding slide pins 6 and 6 disposed opposite to the mold 5 are bored. This guide groove 7.7 has a sloped bottom which increases in depth in the same direction and is guided along the slide pin 6.6.

The curved guide inclined grooves 7, 7 form an acute angle with respect to the direction in which a guide member (or marker) 4, which will be described later, is inserted into the core ball 1, with a favorable angle of 45 degrees.

Furthermore, a hole 8 is made in the core ball 1, and a guide member 4 that matches the outer peripheral surface of the epithelium 3 is inserted into the hole.
This guide member 4 can also be used as a sign as described above.

Next, this core ball 1 is held by a holding slide pin 6.6 disposed opposite to one side of the split mold 5, but at this time, the pushing force of the slide pin 6.6 is weakened, and the core ball 1 is Guide the ball 1: Push the diagonal groove 7°7 along the pins 6 and 6 [Fig. 4, Fig. 5 (a), (b), Fig. 6 (
b)]. At this time, due to the angle of the diagonal back 7.7 around the guide 1, the guide member (also the 1st cutting mark) 4 enters the recess without hitting the green inner surface of the recess of the mold 5 and comes into contact with the inner surface of the recess (Fig. 5C)
b) :].

After pushing the middle core ball into the mold 5 and holding it in the slide bin 6.6 as described above, the core ball 1 is rotated as shown by the arrow in FIG. 5(b) and the guide member (or marker) 4 It is preferable to further rotate the guide member (or marker) 4 along the inner surface of the mold, for example, when the guide inclined groove 7 is bored at 45 degrees with respect to the insertion direction (C) of the guide member (or marker) 4, rotate the guide member (or marker) 4 by 45 degrees. and move the guide member (or sign) 4 as shown in Fig. 5(c) and Fig. 6(
c), (d), position as shown in Figure 7. After that, after combining the other molds 5 and completing mold clamping, do not apply pushing force to the slide pins 6 again [Fig. 6 (C)]
] The mold 5 is injected and filled with synthetic resin. In this way, the synthetic resin injected into the mold 5 forms the epithelium 3 on the surface of the core ball 1, and
If the concave hole 2 of the cough ball 1 is full, open the slide pin 6 just before injection is completed to prevent pin marks from remaining on the epithelial surface 3.

As stated above: C1 The ball according to the present invention has a part of the epithelium infiltrated into the core ball, so the bond between them is extremely strong, the direction is good, and at the same time it can withstand long periods of summer. The multiple recessed holes in the core ball shorten the core ball forming time.The grooves make it easy to securely hold the core ball in the center during production, which significantly improves productivity. It is also easy to integrally mold numbers and other markings that do not leave a lasting impression on the surface of the ball without impairing directionality.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a front view of the product ball, and FIG. 2(a) is a (11!11 side view) of the core ball.
. FIG. 2(b) is a plan view of the core ball, FIG. 3 is a perspective view showing the inserted state of the core ball and the marker, and FIGS. 4 to 7 are illustrations of the production process. 1... Nucleus Beaunope 2... Concave hole, 3: Epithelium, 4: Marker, 5: Mold, 6: Holding slide pin, 7: Guiding inclined groove, 8: Hole. Figure 2 Figure 1 Figure 3 Figure 3 (1)

Claims (1)

[Scope of Claims] (1) A synthetic resin ball with a core ball wrapped around the core, the core ball having a plurality of recesses, and a portion of the synthetic resin infiltrating into the recesses. A ball that is characterized by letting it go north. 2) The ball according to claim 1, wherein the recessed hole extends through the core ball. 3) The ball according to claim 1 or 2, which has a mark embedded in its surface. 4) A method in which a core ball is held in the inner core of a split mold and synthetic resin is injection molded on the peripheral surface of the core ball, the core ball having a plurality of concave holes and holding holes arranged opposite to the mold. A guide inclined groove for the slide pin is bored and a guide member that matches the outer peripheral surface of the ball epithelium to be molded is inserted, and the core ball is placed in the mold by aligning the guide inclined groove with the holding slide bin. A method for producing a ball, characterized in that the ball is pushed in and held in contact with the inner surface of the guide member alloy mold, and after mold clamping is completed, injection molding of synthetic resin is performed. 5) The method for producing a ball according to claim 4, wherein the recessed hole penetrates the core ball. 6) The method for producing a ball according to claim 4 or 5, wherein a guide member having a mark formed thereon is used. 7) The ball according to claim 4, 5, or 6, wherein the direction of the guide inclined groove is formed to make an acute angle with the direction in which the guide member is inserted into the core ball. production method.