JPH04250182A - Pachinko machine playing board - Google Patents

Abstract

PURPOSE:To easily manufacture a playing board for pachinko and improve the productivity by setting a linear stick needle in a molding die so that its top end is protruded into a cavity, and injecting a plastic into this cavity. CONSTITUTION:A pair of die bodies 1a, 1b relatively movable so as to mutually approach and separate are provided. A linear stick needle 4... having no shade on the head part is inserted to a vertical hole 6 bored in the opposite surface to the cavity 3 of one die body 1a and set in such a manner that its top end part having two minor diameter book parts 5 formed on the outer circumference are protruded into the cavity 3. A facing plate 7 such as a thin celluloid plate having a picture pattern printed thereon is set to the cavity 3 opposite surface of the die body 1a. In this state, a plastic is injected into the cavity 3 from an injection cylinder 2, and after hardening the plastic, the die is released to provide a playing board in which the nails 4... are integrally planted on a plastic plate 8.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a game board for a pachinko machine on which a large number of nails are installed.

0002

[Prior Art] As is well known, the game board of a pachinko machine is
It was made by driving a large number of nails into a plywood board that had been cut into the desired external shape using an automatic nail driver or the like.

0003

[Problem to be solved by the invention] Since plywood is a natural material, its hardness varies greatly depending on the material, and even a single plywood board may have different hardness depending on its parts. There has been a problem in that when two nails are driven under the same conditions, variations tend to occur in the driving depth, bending, and positional accuracy of the nails.

Furthermore, processing plywood requires special equipment and generates a large amount of wood chips, which is expensive to dispose of.Furthermore, even if an automatic nailer is used, it is difficult to drive multiple nails at the same time. Since it is difficult to insert nails into the nails, it takes time to drive the nails, resulting in poor productivity. Furthermore, plywood boards have the disadvantage that they are difficult to store because their warpage and hardness change greatly when the environment such as humidity changes, and the individual game boards are not stable.

[0005]

[Means for Solving the Problems] The pachinko machine game board of the present invention is an attempt to solve the above-mentioned problems, and is made by molding straight nails with no umbrella on their heads into molds so that their tips protrude into the cavity. The nail is integrally inserted into a plastic plate formed by injecting plastic into the cavity.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to the drawings. Figure 1 shows a longitudinal section of a mold for forming this game board, in which 1a and 1b are mold bodies that are movable relative to each other so as to move toward and away from each other, and 2 is a mold formed between the mold bodies. This is an injection tube that can inject plastic into the cavity 3.

[0007] The nail 4 shown in FIG. 2 has a straight bar shape without a cap on its head, and has two small-diameter constrictions 5 formed on the outer periphery of its tip.

The nail 4 is inserted into the vertical hole 6 bored in the surface facing the cavity 3 of the one mold body 1a, and the small diameter constriction 5 at the tip thereof is projected into the cavity 3 and set. At the same time, a facing plate 7 made of a synthetic resin such as a thin celluloid plate on which a picture pattern or the like is printed in advance on the surface of the mold body 1a facing the cavity 3 is set, and the injection tube 2 is inserted into the cavity 3. Inject more plastic. After the plastic in the cavity 3 has hardened, the mold is opened to obtain a game board in which the nails 4 are integrally planted in the plastic board 8 as shown in FIGS. 3 and 4.

By forming the small diameter constriction 5 in the part where the nail 4 is embedded in the plastic plate 8 in this way, the plastic material is fixed in the small diameter constriction 5, making it difficult for the nail 4 to come out after molding. Further, by inserting the mounting plate 7 in advance, it can be fixed integrally.

[0010] The nail 4 without an umbrella on the head does not pose any problem in playing pachinko, and it is easy to clean since dirt does not get caught on the nail 4. Such a straight bar-shaped nail is convenient because it can be set directly into the vertical hole 6.

[0011]

[Effects of the Invention] As described above, the pachinko machine game board of the present invention does not require woodworking machines or nailers, and does not generate wasteful materials such as wood chips, unlike when using conventional plywood boards. It saves labor and improves productivity.

In addition, unlike plywood, the shape of the product is not affected by the storage environment, such as warping, making it easier to manage, and the positioning accuracy of the nails is dramatically improved, making it easier to use nails than with conventional plywood. This has beneficial effects such as eliminating the need for correction processes.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a mold for molding a pachinko machine game board according to the present invention.

FIG. 2 is a perspective view of a nail.

FIG. 3 is a perspective view of the game board.

FIG. 4 is a vertical cross-sectional view of the game board.

[Explanation of symbols]

1a, 1b mold body 2 Injection tube 3 Cavity 4 Nails 6 Vertical hole 7　　　　　　　　　　　　Mounting board

Claims (1)

[Claims] [Claim 1] A straight nail with no umbrella on the head is set in a mold so that its tip protrudes into the cavity,
A pachinko machine game board characterized in that the nails are integrally inserted into a plastic board formed by injecting plastic into the cavity.