JP2677253B2 - Drawing board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drawing board, and more particularly to a drawing board which has a certain strength while achieving a reduction in weight.

[0002]

2. Description of the Related Art As a known drawing board, for example, as shown in FIG. 3, a core material 30 assembled in a substantially rectangular frame shape, and a surface material adhered to each surface of the core material 30 It is composed of 31, 31. In this type of drawing board, the core material 30 and the surface material 31 are made of wood plywood or wood chip plywood.
A space corresponding to the thickness of the core material 30 is formed between the members 31, and thereby, the weight is ensured and the portability is provided.

[0003]

However, in the conventional drawing board, since the material used is wood plywood, etc.,
It is not possible to make the quality of the material itself uniform, and this inevitably causes variations in the quality of the drawing boards as products, such as appearance, dimensional accuracy, and strength. It was

Further, since the material used is wood, it is difficult to stably secure the arrival of the material, and in this case, there is a limit to the mass production system.

Further, the conventional drawing board adopts a structure in which the space between the front and back surface materials 31, 31 is used to reduce the weight, but this is due to the regulation of the total amount of materials used. It is not intended to reduce the weight of the surface material 31 and the surface material 31 itself. Therefore, when the drawing board is made relatively large, a plurality of reinforcing bars similar to those of the core material 30 are required, which further increases the weight. Will be invited. Moreover, since the structure is provided with a space, it is unavoidable that the surface material 31 may be cracked or the like when an unexpected external force is applied to the surface of the surface material 31. In this case, the product's mission as a drawing board is lost and it cannot be used thereafter.

[0006]

SUMMARY OF THE INVENTION The present invention has been devised by paying attention to the disadvantages of the conventional example, and its purpose is to further reduce the weight as compared with a wooden drawing board and to add an inadvertent external force. You can secure the strength that will not be damaged even if damaged,
It is to provide a drawing board in which variations in quality do not occur between products.

[0007]

Means for Solving the Problems] To achieve the above object, the drawing board according to the present invention, a plate-shaped base material made of foamed resin molded body, is laminated on the front and back surfaces of the substrate Rutotomo
In, a fiber reinforced resin sheet having substantially the same plane area as the base material, and a surface sheet laminated on the fiber reinforced resin sheet on the surface side, and using only the base material as a core material in a solid mold
Configure, it adopts a configuration that.

Further, the drawing board according to the present invention comprises a plate-shaped base material made of foamed resin molded body, is laminated on the front and back surfaces of the substrate Rutotomoni, substantially the same planar area and the substrate fiber <br/>-reinforced resin sheet and, and a surface-side fiber reinforced resin sheet magnetic sheets stacked on the, core only the substrate material
The above-mentioned object can also be achieved by the configuration of a solid type .

Furthermore, the present invention includes a plate-shaped base material made of foamed resin molded body, it is laminated on the front and back surfaces of the substrate Rutotomo
In, a fiber reinforced resin sheet having substantially the same plane area as the base material, a surface sheet laminated on the front surface side fiber reinforced resin sheet, and a back surface sheet laminated on the back surface side fiber reinforced resin sheet. Equipped with the base material only as a core material
Make up, the configuration is adopted that.

Further, the present invention includes a plate-shaped base material made of foamed resin molded body, it is laminated on the front and back surfaces of the substrate Rutotomo
In, a fiber reinforced resin sheet having substantially the same plane area as the base material, a magnetic sheet laminated on the front side fiber reinforced resin sheet, and a back sheet laminated on the back side fiber reinforced resin sheet. Solid with the base material as the core material
It is also used in a mold .

It is preferable to provide an end face sheet for covering the base material on the outer peripheral end surface of the base material, whereby a drafting plate is formed in which the material constituting the base material is not exposed. To be done.

[0012]

In the drawing board according to the present invention, since the entire base material is formed of the foamed resin molded body, the weight of the base material itself is significantly reduced even when the solid structure is formed, and the entire drawing board is greatly increased. Weight reduction can be realized.

By laminating the fiber reinforced resin sheet on each of the front and back surfaces of the base material, the brittleness of the base material itself can be compensated, and the strength capable of withstanding shearing can be imparted, and damage such as bending and cracking can be imparted. The cause is avoided.

The fiber-reinforced resin sheet has a certain degree of surface roughness depending on the fiber material contained in the sheet, but the surface roughness is corrected by laminating the surface sheet on the fiber-reinforced resin sheet on the surface side. Therefore, the working surface of the drawing board can be kept smooth. When the surface sheet is made of a magnetic material sheet,
It is possible to fix the drawing sheet in a fixed position using a magnet or the like.

In the structure in which the back sheet is laminated on the fiber-reinforced resin sheet on the back side, the front and back surfaces of the drawing board can be arbitrarily used as work surfaces.

Further, when the end face sheet is provided on the outer peripheral end face of the base material, the molding material of the base material is not exposed to the outside,
Good product appearance of the drawing board is also secured.

[0017]

Embodiments of the drawing board according to the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the drawing board according to the present invention. In this figure, a drawing board 10 comprises a plate-shaped base material 11 and fiber-reinforced resin sheets 1 laminated on the front and back surfaces of the base material 11, that is, on the top and bottom surfaces in the drawing, respectively.
2, 13 and the top sheet 15 laminated on the front side fiber reinforced resin sheet 12 and the back side fiber reinforced resin sheet 1
3 and a back sheet 16 laminated on the sheet 3, and an end sheet 17 provided on the outer peripheral end surface of the base material 11.

The base material 11 is formed of, for example, a resin molded body obtained by foaming a resin material such as polypropylene with a foaming agent. The expansion ratio is not particularly limited, but it is preferable that the expansion ratio be such that weight reduction can be achieved. Further, the plate thickness of the base material 11 is set to an extent suitable for use as a drawing board.

The fiber reinforced resin sheets 12 and 13 are also provided.
Is made of, for example, a thin sheet of polypropylene or the like containing glass fibers. The fiber content in the fiber reinforced resin sheets 12 and 13 is set to such an extent that a certain rigidity can be given to the base material 11 to secure the strength.

The surface sheet 15 is a fiber reinforced resin sheet 1.
It is for correcting the surface roughness caused by the fibrous material contained in 2 to form a smooth working surface, and in this embodiment, it is made of a magnetic material sheet such as paper, resin film, or stainless sheet. There is.

The backsheet 16 is the topsheet 15
Similar to the above, it is configured by using paper, resin film, or the like. However, the back sheet 16 may be omitted if necessary, and in this case, the fiber-reinforced resin sheet 13 is simply exposed on the back side.

The end face sheet 17 is a sheet for covering the outer peripheral end face of the base material 11 and finishing so that the foam, which is a molding material, is not exposed. The molding material of the sheet 17 is not particularly limited, but it is preferable that the sheet 17 is made of a thin sheet such as a resin film.

The drawing board 10 having the above-mentioned structure is crimped,
It can be formed by adhesion or the like. As a molding method, a general laminate molding method can be adopted. For example, a large number of base materials 11 previously molded to the size of the drawing board 10 are supplied while being heated one by one, and in synchronization with this. The fiber-reinforced resin sheet 1 on each side of the base material 11
It is possible to integrate these by sending out 2 and 13 under heating and hot pressing at a predetermined molding position.
After that, the topsheet 15 and the like may be laminated by adhesion or the like. When the top sheet 15 and the back sheet 16 are resin sheets, they may be hot pressed together with the fiber reinforced resin sheets 12 and 13.

Therefore, according to such an embodiment, since the base material 11 is formed of the foamed resin molded body, the weight of the base material 11 which is a main part of the drawing board is remarkably reduced. It is possible to achieve weight reduction. Therefore, as a drawing board in which the plane area of the base material 11 is large, it is possible to obtain an effect that the weight reduction can be promoted as compared with a wooden drawing board.

Although the base material 11 has a low strength as a foam itself, the base material 11 has a solid structure,
Moreover, since the fiber-reinforced resin sheets 12 and 13 are laminated on the front and back surfaces, the strength of the base material 11 is reinforced to form a plate-like body that can withstand shearing and the like, and there are conflicting demands for weight reduction and strength increase. You can be satisfied at the same time.

Further, since the surface sheet 15 is laminated on the fiber-reinforced resin sheet 12 on the surface side, the fiber-reinforced resin sheet 1
The surface roughness possessed by 2 can be compensated to provide surface smoothness.

The drawing board 10 according to the present invention is not limited to the structure of the above-described embodiment, and for example, the structure shown in FIG. 2 can be adopted. That is, in the above embodiment, the outer peripheral end face of the base material 11 is separated from the end face sheet 17 separately.
However, the fiber-reinforced resin sheet 12 and the surface sheet 15 on the front surface side are provided with a large planar shape, and the outer constant regions are bent to form the base material 11.
It may be configured to cover the outer peripheral end surface of. Instead of this, the fiber-reinforced resin sheet 12 or the top sheet 15
It is also possible to adopt a configuration in which only one of the two is enlarged to cover the above.

According to this, in addition to the above effects, the manufacturing process of the drawing board 10 can be further simplified.

When the surface sheet 15 is formed of paper or a resin film, the material used for bonding these is applied as a pressure sensitive adhesive to the surface sheet 15 and the fiber reinforced resin sheet 12 is coated with the material. The drawing board 10 may be configured by bonding. In this case, when the topsheet 15 is soiled to a certain extent or more, the topsheet 15 can be peeled off and a new topsheet 15 can be bonded to the fiber reinforced resin sheet 12, and the drawing board 1 is always provided.
It is possible to keep the working surface of 0 clean.

[0031]

Since the present invention is constructed and operates as described above, the weight of the present invention can be further reduced as compared with the conventional drawing board, and even if an inadvertent external force is applied. It is possible to provide an unprecedented excellent drawing board in which it is possible to secure strength without damage and to avoid quality variations among products.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a drawing board according to the present invention.

FIG. 2 is a sectional view showing a modified example of the embodiment.

FIG. 3 is a sectional view showing a conventional drawing board.

[Explanation of symbols]

 10 Drawing Board 11 Base Material 12 Fiber Reinforced Resin Sheet 13 Fiber Reinforced Resin Sheet 15 Top Sheet 16 Back Sheet 17 End Sheet

Claims (5)

(57) [Claims] 1. A plate-shaped substrate made of a foamed resin molded body,
Rutotomoni is laminated on the front and back surfaces of the substrate, and the substrate
A fiber-reinforced resin sheet having substantially the same plane area, and a surface sheet laminated on the fiber-reinforced resin sheet on the surface side, characterized in that it is configured as a solid type only the base material as a core material. Drafting board. 2. A plate-shaped substrate made of a foamed resin molding,
Rutotomoni is laminated on the front and back surfaces of the substrate, and the substrate
A fiber reinforced resin sheet having substantially the same plane area, and a magnetic sheet laminated on the fiber reinforced resin sheet on the front surface side , wherein only the base material is configured as a core material to be a solid type, A drafting board. 3. A plate-shaped substrate made of a foamed resin molded body,
Rutotomoni is laminated on the front and back surfaces of the substrate, and the substrate
A fiber-reinforced resin sheet having substantially the same plane area, a surface sheet laminated on the fiber-reinforced resin sheet on the front surface side, and a back sheet laminated on the fiber-reinforced resin sheet on the back surface side, only the base material A drawing board characterized in that the core material is a solid type . 4. A plate-shaped base material made of a foamed resin molded body,
Rutotomoni is laminated on the front and back surfaces of the substrate, and the substrate
A fiber-reinforced resin sheet having substantially the same plane area, a magnetic sheet laminated on the fiber-reinforced resin sheet on the front surface side, and a back sheet laminated on the fiber-reinforced resin sheet on the back surface side , wherein the base material A drawing board characterized by being configured as a solid type using only a core material . 5. The drawing board according to claim 1, wherein an end face sheet that covers the base material is provided on an outer peripheral end surface of the base material.