JP2899280B1 - Board for pachinko machine - Google Patents

Abstract

An object of the present invention is to provide a pachinko machine base plate which has excellent nail holding power, and which can save resources and reduce costs. SOLUTION: A core plate 1a made of a hard plywood having a dense structure such as a plywood material corresponding to a nailing surface 10 is provided on the front and back surfaces of a center plate 1 framed by a soft wood plate piece 1b. A surface board 3 made of a soft plywood was stuck and integrated via a protective core plate 2 framed by a soft wood board piece 2b around a hard board 2a of the same size as 1a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a platform for a pachinko machine which is excellent in holding force of nails and can save resources and reduce costs.

[0002]

2. Description of the Related Art Conventionally, hard plywood such as pine having excellent nail holding power has been widely used as a base plate for a pachinko machine. However, the output of hard wood such as pine is decreasing year by year. Therefore, there are also problems that the production cost is high and that it is against resource saving and environmental protection. Therefore, a hard plywood material such as a bun is used as a core plate and a soft plywood material such as a Lauan material is adhered and integrated on the front and back surfaces of the core material. Problems similar to have become unavoidable.

[0003]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned conventional problems, and has a performance equivalent to that of a hard plywood such as a blank material or a product using the same as a core plate in terms of nail holding force. In addition to being able to nail easily, it does not cause cracks in the celluloid plate or warping due to changes in humidity in the playground, and at the same time reduces production costs and saves resources and saves the environment. It has been completed for the purpose of providing a pachinko machine base plate capable of improving protection.

[0004]

Means for Solving the Problems A platform for a pachinko machine according to the present invention, which has been made to solve the above-mentioned problems, has a core made of a dense hard plywood having a structure corresponding to a nailing surface, such as a bushing material. Surface plate material made of soft plywood, via a protective core plate in which the periphery of the board is framed with soft wood board pieces, on the front and back surfaces of a center board material framed with soft wood board pieces, and a hard board of the same size as the core board is framed with soft wood board pieces. Is integrated.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. In the figure, reference numeral 1 denotes a size corresponding to the nailing surface, and a center formed by framing a square core plate 1a made of a hard plywood having a dense structure such as a plywood with a soft wood board piece 1b such as aspen. The plate material 2 is a protective core plate in which the periphery of a hard board 2a of the same size as the core plate 1a is framed by a soft wood plate piece 2b such as aspen, and 3 is a surface plate material made of a soft plywood such as Lauan. A basic structure is a sandwich structure in which a protective core plate 2 is adhered to the front and back surfaces of the center plate 1, and a surface plate 3 is further adhered to the surface of the protective core plate 2 to integrate the whole.

The center plate 1 is not made of a hard plywood such as a lumber having a specific gravity of about 0.6 to 0.8 on the entire surface as in the prior art, but as shown in FIG. Only the part corresponding to the striking surface is a square core plate 1a made of hard plywood such as plywood, and the periphery thereof is plywood made of aspen, birch wood, or other fragile wood whose structure has almost no use as wood in the past. The frame is framed by the soft wood board piece 1b as described above. In the drawing, a core plate 1a made of hard plywood is a rectangular portion corresponding to the nailing surface 10 by arranging three strip-shaped plate members in parallel, and a soft wood board piece 1b is formed by cutting four strip-shaped plate members into the hard plate member. The core plate 1a made of plywood is arranged in a frame around the periphery of the core plate 1a. Five sheets of such a structure having a thickness of about 1.5 mm are laminated and bonded with a soybean protein adhesive to form a center. The plate material 1 is formed, and the center ply material 1 has such a structure.
In addition to holding the nail firmly with a, the portion that does not correspond to the nailing surface 10 is made of inexpensive material to reduce the amount of expensive lump material and the like to reduce the cost, and to form efficiently with high precision. .

On the other hand, the protective core plate 2 is formed of a hard board 2a having a specific gravity of about 0.8 to 1.1 only at a portion corresponding to the nailing surface 10, and the surroundings thereof are made of wood, such as aspen or birch, having a weak structure. The frame is framed by a soft wooden board piece 2b such as a sliced veneer. The hard board 2a is hardly warped due to drying or the like.
The use of the hard board 2a corrects the distortion of the plywood due to the change in humidity in the playground to maintain the dimensions of the pachinko board, and reliably prevents the nail from being loosened by the holding force. Further, depending on the installation location, depending on the installation location, nails for fastening may be driven from the side surface side, and cracks may occur when directly driven into the hard board 2a. However, the protective core plate 2 of the present invention is made of a soft plywood. Since the frame is framed in 2b, there is no such concern.

The entire surface plate 3 is made of a soft plywood such as Lauan wood having a specific gravity of 0.6 or less. In the illustrated example, a plate having a thickness of about 1.5 mm is bonded to soybean protein. It is formed by laminating and bonding three sheets with an agent. The surface plate material 3 allows the nail to be pierced in a straight state even if the nail is lightly nailed at the time of nailing, and secures the smoothness of the base plate surface and facilitates the attachment of the decorative celluloid plate. It is.

[0009] In the case of the above-mentioned construction, when a decorative celluloid plate is stuck on a surface plate and then nailed in the same manner as a conventional pachinko machine base plate, the nail is used as the surface plate 3. Pierced straight through the hard board 2a without passing through the hard board 2a without cracking to reach the square core plate 1a made of hard plywood, the structure of which is not loose due to the strong holding force of the dense hard plywood. Although it has the same durability as the pachinko machine base plate mainly made of plywood, in particular, in the present invention, the core plate 1a made of hard plywood is disposed only in the portion corresponding to the nailing surface 10, and The surrounding area where is not struck is a frame that is framed with soft plywood 1b because the tissue such as aspen, which had been previously discarded for no use, is fragile. And cost reduction So that the can be achieved. Only the part corresponding to the nailing surface 10 is hard board 2a.
Since the center plate 1 is sandwiched between the protective core plate 2 and the surface plate member 3, distortion of the core plate 1 a due to humidity change in the playground is corrected, so that the dimensions as a pachinko board can be maintained. The nail can be reliably prevented from being loosened by the holding effect. In addition, the pull-out strength of the nail is generally required to be 30 kgf / mm ² or more in the pachinko machine, but the result of measuring the pull-out strength of the nail of the machine according to the present invention in the usual manner is 40 to 60 kgf / mm. It was in the range of mm ² and it was confirmed that there was sufficient strength.

[0010]

As is clear from the above description, the present invention can easily perform nailing, prevent cracks from being generated in the celluloid plate, and change the humidity in the playground. Despite this, the base plate can be distorted and the nails can be prevented from loosening, and furthermore, the use of hard plywood material, which is depleted of resources such as wood, is reduced and the production cost is reduced. It can also save resources and improve environmental protection. Therefore, the present invention greatly contributes to industrial development as a pachinko machine platform that has eliminated the conventional problems.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is a cutaway perspective view showing a center plate material.

FIG. 3 is a sectional view showing an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Center board material 1a Core board made of hard plywood 1b Soft wood board piece 2 Protective core board 2a Hard board 2b Soft wood board piece 3 Surface board material 10 Nailing surface

Claims (1)

(57) [Claims] A core plate (1) comprising a core plate (1a) made of a hard plywood having a dense structure, such as a plywood material corresponding to a nailing surface (10), framed by a soft wood board piece (1b). On the front and back surfaces of the core plate (1a), a hard board (2a) of the same size as the core plate (1a) is passed through a protective core plate (2) framed by a soft wood plate piece (2b), and a front plate material made of soft plywood. (3) A base plate for a pachinko machine, characterized by sticking and integrating.