JP7349723B2 - Ultra-thin writing and bulletin board and construction method for ultra-thin writing and bulletin board - Google Patents

Description

The present invention is an ultra-thin writing device that is ultra-thin, lightweight, has a good appearance, is difficult to fall, and has a structure that makes it easy to dispose of chalk powder and other waste. The present invention relates to a construction method for a bulletin board and an ultra-thin writing and bulletin board using an extremely simple construction method.

Conventional general writing and bulletin boards (blackboards or whiteboards) are made by using the required number of L brackets that are arranged at equal intervals, with the top and bottom heights of the board body being equal to the wall surface on which it is attached. It is designed so that it can be installed.

In addition, regarding conventional construction of general writing and bulletin boards on walls, two or more workers hold the board itself, which has been assembled in advance at a factory or assembled on the spot, while attaching it to the wall. This is done by attaching the board to the L bracket, and then fixing the L bracket and the board body with screws.

By the way, during the Great East Japan Earthquake in March 2011, many of the boards that had been installed fell off the walls.
The walls on which the boards were installed were often those of old school buildings, but similar situations have also occurred in relatively new school buildings.

That is, the fixing method using the L metal fittings involves the problem that the risk of falling cannot be denied in the event of a future mega-earthquake.

In addition, there is a problem in that the risk of the board body falling not only in the event of an earthquake but also in normal times cannot be denied.

In this way, writing and bulletin board boards traditionally installed on the walls of school buildings, etc., have to be difficult to fall off the wall, be thin and have a good appearance, and have to be disposed of with chalk dust etc. There was a need for simple and easy processing.

Patent Document 1 discloses that a magnetic sheet is attached to the surface of a plywood substrate using an adhesive, and a blackboard surface material made of a steel plate is attached to the surface of the magnetic sheet by the magnetic attraction force. A blackboard is disclosed in which the blackboard is surrounded by an aluminum frame and attached to a wall using L-shaped fittings.

However, in the case of the blackboard of Patent Document 1, as shown in FIG. The structure is such that the blackboard itself is attached to the wall, and the risk of the blackboard itself falling cannot be denied.

Japanese Patent Application Publication No. 11-59068

The present invention was developed in view of the above-mentioned conventional circumstances, and is ultra-thin, lightweight, has a good appearance, and has a structure that prevents it from falling. The present invention provides an ultra-thin writing and bulletin board with a structure that is simple and easy to process, and a method of constructing the ultra-thin writing and bulletin board with an extremely simple construction method.

In the ultra-thin writing and bulletin board according to the present invention, the surface material is made of iron or the like and is coated, the back side is formed of a base material such as wood, and the space between each material on the front side and the back side is , a board body with a three-layer structure sandwiching thin plate-like sheet materials made of magnetic material, etc., and these three layers formed into a rectangular shape, and a board that is attached to the outer periphery of the board body and has a three-layer structure with thin plate-shaped sheet materials made of magnetic material etc. sandwiched between them. a frame material surrounding three sides of the board; a powder receiver disposed at the bottom of the board body for placing chalk or an eraser; and a powder receiver supported at both corners of the board so that it can be opened and closed in its length direction and is detachable. and a powder receiving box for storing chalk dust and eraser waste collected in the powder receiving part and discharged outward from both corners, and the thickness of the three-layered board body is ultra-thin, with a thickness of 5 mm or more and 10 mm or less. The most important feature is that it was formed in

According to the invention as claimed in claim 1, the ultra-thin and lightweight device has a good appearance, is difficult to fall off, and has a structure that allows simple and easy disposal of chalk powder and the like to be disposed of. A thin writing and bulletin board can be realized and provided, and the powder receiver includes a powder receiver main body having a receiving surface part on the upper surface side for receiving chalk dust and eraser debris that falls from the surface of the board main body, and both end surfaces of this powder receiver main body. and a pair of side caps that are provided with a concave portion having the same shape as the receiving surface of the powder receiving body and are attached without any step, and the chalk dust and eraser shavings are removed from the receiving surface of the powder receiving body. Since it is configured so that it can be discharged outward through each side cap, the chalk dust and shavings falling onto the powder receptacle can be smoothly and simply discharged outward. It is possible to realize and provide type writing and bulletin boards.

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According to the invention as claimed in claim 2, the ultra-thin and lightweight device has a good appearance, is difficult to fall off, and has a structure that makes it simple and easy to dispose of chalk powder and the like to be disposed of. It is possible to realize and provide a thin writing and bulletin board, and since the frame material exposed on the front side of the board body has an ultra-thin structure, the external appearance is even better, and it is easy to see from the front. In addition to realizing and providing an ultra-thin writing and bulletin board that is good for indoor interior design and expands the writing area, it also has a dust receptacle on the top side that prevents chalk dust from falling from the surface of the board. , a powder receiver main body having a receiving surface portion for receiving shavings; and a recessed portion having the same shape as the receiving surface portion of the powder receiver main body on both end surfaces of the powder receiver main body, and the powder receiver main body is attached without a step. A pair of side caps are provided, and the chalk dust and eraser dust can be discharged from the receiving surface portion through the side caps to the outside, so that the chalk dust and eraser dust that fall onto the powder receiver are disposed of. It is possible to realize and provide an ultra-thin writing and bulletin board that allows waste to be smoothly and simply discharged to the outside.

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According to the invention as claimed in claim 3, the step of attaching a frame material for surrounding the upper, left and right outer circumferential parts of the board main body and a powder receptacle attached to the lower part to the installation target location; A step of attaching a pasting tool made of double-sided tape and adhesive to the back side and pasting this base material to the area where the frame material and powder receptacle are present, and a step of attaching a magnetic material to the surface of the pasted base material. A process of attaching a sheet material and a process of attaching a surface material made of coated sheet-shaped iron material to the surface of the sheet material results in a three-layer structure, and the thickness of the three layers formed into a rectangular shape is 5 mm. The board body has an ultra-thin thickness of 10 mm or more, and the powder receiving box is attached to a pair of powder receiving box storage bodies provided at both ends of the powder receiving box. It is possible to realize and provide a method for constructing an ultra-thin writing and bulletin board that can extremely simply construct an ultra-thin writing and bulletin board that exhibits the following properties.

According to the invention set forth in claim 4 , in the invention set forth in claim 3 , the board main body, the frame material, the powder receiver, the powder receiver box storage body, and the powder receiver box are made of a noncombustible material or a flame retardant material. Therefore, it is possible to realize and provide a method for constructing an ultra-thin writing and bulletin board that exhibits the same effects as the invention described in claim 3 and also has non-flammable specifications or flame-retardant specifications.

FIG. 1 is a schematic front view of an ultra-thin writing and bulletin board according to an embodiment of the present invention. FIG. 2 is a schematic perspective view of the ultra-thin writing and bulletin board according to this embodiment. FIG. 3 is a schematic side view of the ultra-thin writing and bulletin board according to this embodiment. FIG. 4 is a schematic plan view of the ultra-thin writing and bulletin board according to this embodiment. FIG. 5 is a schematic bottom view of the ultra-thin writing and bulletin board according to this embodiment. FIG. 6 is a schematic partial enlarged view of section A in FIG. FIG. 7 is a partially enlarged perspective view showing the chalk powder receiving box in the ultra-thin writing and bulletin board according to this embodiment in a closed state. FIG. 8 is a partially enlarged perspective view showing an open state of the chalk powder receptacle in the ultra-thin writing and bulletin board according to this embodiment. FIG. 9 is a schematic front view showing the arrangement of the frame material and the powder receptacle with respect to the installation target location in the method of constructing the ultra-thin writing and bulletin board according to this embodiment. FIG. 10 is a schematic perspective view showing how double-sided tape and adhesive are applied to the back side of the base material in the construction method of the ultra-thin writing and bulletin board according to this embodiment. FIG. 11 is a partially omitted schematic front view showing a state in which a base material is attached to an installation target location in the method of constructing an ultra-thin writing and bulletin board according to an embodiment of the present invention. FIG. 12 is a partially omitted schematic front view showing a state in which a magnet sheet is attached to the surface of a base material in the method of constructing an ultra-thin writing and bulletin board according to this embodiment. FIG. 13 is a schematic front view showing the state in which the surface material is attached to the surface of the magnet sheet in the method of constructing the ultra-thin writing and bulletin board according to this embodiment. FIG. 14 is an explanatory diagram showing the three-layer structure of the board main body in the ultra-thin writing and bulletin board according to this embodiment. FIG. 15 is a schematic front view showing a configuration example of a conventional general blackboard (whiteboard). FIG. 16 is a schematic partial enlarged view of section B in FIG. 15. Figure 17 shows a comparison of the thickness of the board main body of this embodiment and a conventional board main body, and a comparison of the protrusion dimensions from the wall surface of the wall at the installation target location between the board main body of this embodiment and the conventional board main body. FIG. FIG. 18 is a schematic partially enlarged perspective view showing a conventional powder receptacle and side cap. FIG. 19 is a schematic plan view showing a chalk powder hole and a side cap provided in a conventional powder receiver. FIG. 20 is a schematic perspective view showing a chalk powder hole provided in a conventional powder receiver, a powder receiver box storage body, and a powder receiver box.

The present invention provides an ultra-thin writing and bulletin board that is ultra-thin, lightweight, has a good appearance, has a structure that prevents it from falling, and is easy to dispose of chalk powder and other waste. To realize and provide the purpose, the surface material is made of iron material etc. and is coated, the back side is formed of a base material such as wood, and between each material of the front side and the back side, there is a magnetic material etc. A board body with a three-layer structure sandwiching thin plate-like sheet materials and forming these three layers into a rectangular shape, and a frame that is attached to the outer periphery of the board body and surrounds the top, left and right sides of the outer periphery. a powder receptacle disposed at the bottom of the board body for holding chalk or an eraser; and a powder receptacle that is supported at both corners of the powder receptacle so as to be openable and removable in its length direction, and to collect the powder in the receptacle. a powder receiving box for storing chalk powder and eraser waste discharged outward from both corners; The part of the frame material exposed on the front side of the board body is formed to have an ultra-thin width of 1 mm or more to 3 mm or less, and the joint portion of the end of the frame material that surrounds the upper, left and right sides of the outer peripheral part of the board body. This was achieved through a 45-degree diagonal cut called tome machining.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An ultra-thin writing and bulletin board according to an embodiment of the present invention and a method of constructing the same will be described in detail below with reference to the drawings.

As shown in FIGS. 1 to 6 and 14, the ultra-thin writing/bulletin board (ultra-thin blackboard or ultra-thin whiteboard) 1 according to this embodiment has a surface material 3 made of iron or the like, It is coated, and the back side is formed with a base material 4 such as wood, and a thin plate-shaped sheet material 5 made of magnetic material etc. is sandwiched between the front side and back side materials to form a three-layer structure. A board main body 2 in which these three layers are formed into a rectangular shape, frame members 6 and 7 attached to the outer peripheral part of the board main body 2 and surrounding the upper and left and right sides of the outer peripheral part, and a lower part of the board main body 2. A powder receiver 8 for holding chalk (or marker), which is a writing instrument, and an eraser, which is a character erasing tool, is arranged at the bottom of both corners of the powder receiver 8 so that it can be opened and closed in the length direction, and is detachable. A pair of powder receiving boxes 9 are provided for storing chalk dust, eraser shavings, etc., which are collected in the powder receiving box 8 supported by the powder receiving box 8 and are discharged outward from both corners. It has a pair of powder receiving box storage bodies 10 which support the powder receiving box 9 so that it can be opened and closed in the length direction of the powder receiving box 8 and can be attached and detached.

The closed state and open state of the powder receiving box 9 with respect to the powder receiving box storage body 10 are shown in FIGS. 7 and 8.

The thickness of the board body 2 having the three-layer structure is formed to be extremely thin, ranging from 5 mm to 10 mm, thereby improving the appearance of the board body 2.

In addition, the portions of the frame materials 6 and 7 that are exposed on the front side of the board body 2 are formed to have an ultra-thin width of 1 mm or more to 3 mm or less, which improves the appearance and improves the appearance when viewed from the front. The present invention aims to improve the appearance of the board body 2, which is good for indoor interior design, and to expand the writing area (or the display area for paper sheets) on the surface of the board body 2.

As shown in FIG. 8, the powder receiver 8 includes a powder receiver main body 11 having a receiving surface part 12 on the upper surface side for receiving chalk dust and shavings falling from the surface of the board main body 2, and a powder receiver main body 11 having a receiving surface part 12 on both end surfaces of the powder receiver main body 11. On the other hand, it has a pair of side caps 13 which are provided with a concave portion 14 having the same shape as the receiving surface portion 12 of the powder receiving main body 11 and are attached without any step.

The chalk dust and shavings can be smoothly discharged from the receiving surface 12 to the outside of the powder receiving main body 11 via each side cap 13.

The discharged chalk powder and shavings fall into the open powder receiving box 9 and are disposed of as necessary.

Further, in this embodiment, the board main body 2, the frame materials 6, 7, the powder receiver 8, the powder receiver box storage body 10, and the powder receiver box 9 are made of a noncombustible material or a flame retardant material. The ultra-thin writing and bulletin board 1 according to this embodiment can be installed in various buildings that are difficult to evacuate, such as schools, hospitals, high-rise buildings, etc., as stipulated by the Building Standards Act. There is.

According to the ultra-thin writing and bulletin board 1 according to this embodiment, it is ultra-thin, lightweight, and has a good appearance. Since the double-sided tape 15 and adhesive 16 are applied to the wall surface, it is difficult to fall, and the structure of the powder receiver 8 and powder receiver box 9 makes it easy to dispose of chalk powder, etc. to be disposed of. It is also possible to provide an ultra-thin writing and bulletin board 1 that is simple and easy to use.

Next, a method of constructing the ultra-thin writing and bulletin board 1 according to this embodiment will be explained with reference to FIGS. 9 to 13.

First, as shown in FIG. 9, frame materials 6 and 7 for enclosing the upper, left and right outer peripheries of the board body 2, and the lower part are attached to the installation target location (for example, the wall surface of a school classroom). Attach the powder receiver 8 with screws, etc.

Next, as shown in FIG. 10, a pasting tool consisting of double-sided tape 15 and adhesive 16 is pasted on the back side of the base material 4 in the shape of a rectangular plate made of wood or the like, and then, as shown in FIG. The back side of the base material 4 is attached to the area where the frame members 6, 7 and the powder receiver 8 are present, and the front side of the base material 4 is exposed.

Next, as shown in FIG. 12, a thin plate-shaped sheet material 5 made of a magnetic material or the like is pasted on the surface of the pasted base material 4.

Next, a coating-treated surface material 3 made of a sheet-shaped iron material or the like is pasted onto the surface of the sheet material 5 using the magnetic force of the sheet material 5, and these three layers are formed into a rectangular shape to form a three-layer structure. The board body 2 is formed to have an ultra-thin thickness of 5 mm or more and 10 mm or less.

Furthermore, a powder receiving box 9 is attached to a pair of powder receiving box storage bodies 10 provided at both ends of the powder receiving box 8, and an ultra-thin writing/notice board 1 (finished product) according to this embodiment shown in FIG. do.

FIG. 14 is a schematic diagram of the board body 2 of the ultra-thin writing and bulletin board 1 according to this embodiment, which has a three-layer structure consisting of a surface material 3, a base material 4, and a sheet material 5, and has a thickness of 5 mm or more and 10 mm or less. This shows the configuration.

The board main body 2, frame materials 6, 7, powder receiver 8, powder receiver box storage body 10, and powder receiver box 9 are made of noncombustible or flame retardant materials, and have noncombustible or flame retardant specifications. It is also possible to create an ultra-thin writing and bulletin board 1.

According to the construction method of the ultra-thin writing and bulletin board 1 according to this embodiment, the construction method that allows the construction of the ultra-thin writing and bulletin board 1 that exhibits the effects described above in an extremely simple process is possible. can be provided.

Moreover, by the construction method of this embodiment, it is also possible to create an ultra-thin writing/notice board 1 in which the entire wall of the installation target location is used as a writing surface or a bulletin board surface for paper sheets or the like.

Next, with reference to FIGS. 15 to 20, a comparison between the conventional general writing and bulletin board 21, the ultra-thin writing and bulletin board 1 of this embodiment, and the conventional writing and bulletin board 21 will be explained. do.

FIG. 15 shows a general writing and bulletin board 21 that is installed in conventional school classrooms, etc. This writing and bulletin board 21 has a surface material 22 made of iron or the like, coated, and a back side. The board body 24 is made of square timber such as wood, and has a three-layer structure with a board 23 made of plywood or the like sandwiched between the surface material 22 and the square timber on the back side, and these three-layer structures are formed into a rectangular shape. , frame members 25 and 26 attached to the outer periphery of this board body 24 and surrounding the upper and left and right sides of the outer periphery, and frame members 25 and 26 disposed at the upper left corner and the upper right corner of the outer periphery are connected. a corner cap 27 for holding a chalk or an eraser, a powder receiver 28 for holding chalk or an eraser placed at the bottom of the board main body 24, a powder receiving box storage body 29 for placing chalk or an eraser placed under the center part of the powder receiver 28, and a front pull-out type. It has a powder receiving box 30.

The board main body 24 is configured to be attached to a wall surface of a school classroom or the like using a required number of L metal fittings 31 having a wall thickness of, for example, 3 mm and screwed to the wall surface.

Here, to outline the construction method of the conventional writing and bulletin board 21, first, the L fitting 31 is attached to the wall surface of a school classroom or the like with screws.

At this time, if the size of the board main body 24 is approximately 3600 mm in width x approximately 1200 mm in height, a total of 10 L fittings 31 are used, five at the top and five locations, and these are arranged at a pitch within 900 mm. Attach.

Note that the board main body 24 is assembled in advance at a factory and transported by truck, etc., but large board main bodies with a width of 7000 mm may be delivered in pieces depending on the entrance and number of floors of the building where it will be installed. It will be assembled on-site.

When supporting the board main body 24 with each L fitting 31, two or more workers place it on the lower L fitting 31 from the bottom, and then support the upper L fitting 31 and the board main body. 24 are fixed with screws, and the lower L fitting 31 and the board main body 24 are further fixed with screws.

Then, by attaching the powder receiving box 30 to the powder receiving box storage body 29, the construction of the writing/notice board 21 is completed.

However, in the case of the conventional writing and bulletin board 21, even in old school buildings or new school buildings, if the screws for the L bracket 31 are not installed on the appropriate beam or frame, problems may occur in the future. In the event of an unknown mega-earthquake or the like, the writing and bulletin board 21 itself has the undeniable risk of falling.

FIG. 16 is a schematic partial enlarged view of section B in FIG. 15, and the portions of the frame members 25 and 26 that surround the upper and left sides of the outer peripheral portion, and the corner cap 27 that are exposed on the front side of the board body 24. The width of the frame members 6 and 7 exposed on the front side of the board body 2 according to the embodiment of the present invention is wide compared to the ultra-thin width of 1 mm or more to 3 mm or less.

FIG. 17 shows a comparison of the thicknesses of the board body 2 of this embodiment and the board body 24 of the conventional example, and the thickness of the board body 2 of this embodiment and the board body 24 of the conventional example from the wall surface of the installation target location. This shows a comparison of protrusion dimensions.

For example, the thickness of the board main body 2 according to the configuration of this embodiment and the protrusion dimension from the wall surface are within 10 mm, while the thickness of the board main body 24 in the conventional example is about 36.5 mm, and the protrusion from the wall is 10 mm or less. The length of the protrusion is the thickness of the L bracket 31 attached to the wall, which is 3 mm, and the total length is about 39.5 mm, but in the case of this embodiment, the thickness is about 1/4 of that of the board in the conventional example. As a result, according to the configuration of this embodiment, an ultra-thin and lightweight board can be realized.

FIG. 18 is a schematic partially enlarged perspective view showing a conventional side cap 32. In the conventional side cap 32, an end surface portion 32a of the side cap 32 is structured to close the side of the powder receptacle 28. , the structure is such that it is difficult to discharge chalk powder and the like to the outside from the side of the powder receiver 28, and this is significantly different from the side cap 13 of this embodiment.

19 shows the chalk powder hole 28a provided in the powder receiver 28 and the side cap 32 in the case of the conventional example, and FIG. 20 shows the chalk powder hole 28a provided in the powder receiver 28 in the conventional example and the central part of the powder receiver This figure shows a powder receiving box storage body 29 disposed below and a powder receiving box 30 that can be pulled out from the front.

In the case of the conventional example, chalk powder or the like is dropped through the chalk powder hole 28a into the powder receiving box 30 below the chalk powder hole 28a using an eraser or a rag, and if necessary, the powder receiving box 30 is pulled out to the front and the chalk is removed. Dispose of powder, etc.

On the other hand, in the case of this embodiment, as described above, chalk powder etc. accumulated in the powder receiver 8 can be easily and quickly removed in the powder receiver box 9 which is opened at both ends of the powder receiver 8. As a result, the chalk powder hole 28a in the conventional example is no longer necessary, facilitating the disposal of chalk powder, etc., and facilitating the processing of the powder receiver 8, reducing manufacturing costs. It becomes possible to reduce the cost.

The ultra-thin writing and bulletin board according to the present invention can be installed on the walls of classrooms, conference rooms, offices, etc. in the educational industry, general companies, etc., and can be used in a wide range of applications.

1 Ultra-thin writing/notice board 2 Board body 3 Surface material 4 Base material 5 Sheet material 6, 7 Frame material 8 Powder receiver 9 Powder receiver box 10 Powder receiver box storage body 11 Powder receiver main body 12 Receiving surface part 13 Side cap 14 Recess Part 15 Double-sided tape 16 Adhesive 21 Writing/notice board 22 Surface material 23 Board material 24 Board body 25, 26 Frame material 27 Corner cap 28 Powder receiver 28a Chalk powder hole 29 Powder receiver box storage body 30 Powder receiver box 31 L bracket 32 Side Cap 32a end face part

Claims (4)

The surface material is made of iron material and is coated, the back side is formed of a wood base material, and a thin plate-like sheet material made of magnetic material is sandwiched between the front side and the back side. A board body with a layered structure and these three layers formed into a rectangular shape,
A frame material attached to the outer periphery of the board body and surrounding the upper, left and right sides of the outer periphery;
a powder receptacle for placing chalk, eraser, etc., placed at the bottom of the board body;
a powder receiving box that is disposed at both corners of the powder receiver so as to be openable and closable in the length direction thereof, and stores chalk dust and eraser waste that accumulates in the powder receiver and is discharged to the outside of both corners;
has
An ultra-thin writing/posting board in which the three-layer structure board body is formed to have an ultra-thin thickness of 5 mm or more and 10 mm or less,
The powder receiver has a powder receiver body having a receiving surface portion on the upper surface side for receiving chalk dust and eraser particles falling from the surface of the board main body, and a powder receiver body having a receiving surface portion on both end surfaces of the powder receiver body having the same shape as the receiving surface portion of the powder receiver body. a pair of side caps having a concave portion and attached without a step,
An ultra-thin writing and bulletin board, characterized in that the chalk dust and eraser dust can be discharged outward from the receiving surface through each side cap. The surface material is made of iron material and is coated, the back side is formed of a wood base material, and a thin plate-like sheet material made of magnetic material is sandwiched between the front side and the back side. A board body with a layered structure and these three layers formed into a rectangular shape,
A frame material attached to the outer periphery of the board body and surrounding the upper, left and right sides of the outer periphery;
a powder receptacle for placing chalk, eraser, etc., placed at the bottom of the board body;
a powder receiving box that is disposed at both corners of the powder receiver so as to be openable and closable in the length direction thereof, and stores chalk dust and eraser waste that accumulates in the powder receiver and is discharged to the outside of both corners;
has
An ultra-thin writing and bulletin board in which the thickness of the board body with the three-layer structure is ultra-thin from 5 mm to 10 mm, and
The portion of the frame material exposed on the front side of the board body is formed to have an ultra-thin width of 1 mm or more to 3 mm or less, and the edge portion of the frame material surrounding the top, left and right sides of the outer peripheral portion of the board body is The joint part is an ultra-thin writing and bulletin board made by cutting diagonally at 45 degrees, which is called tome processing.
The powder receiver has a powder receiver body having a receiving surface portion on the upper surface side for receiving chalk dust and eraser particles falling from the surface of the board main body, and a powder receiver body having a receiving surface portion on both end surfaces of the powder receiver body having the same shape as the receiving surface portion of the powder receiver body. a pair of side caps having a concave portion and attached without a step,
An ultra-thin writing and bulletin board, characterized in that the chalk dust and eraser dust can be discharged outward from the receiving surface through each side cap. A step of attaching a frame material to surround the outer periphery of the top, right and left sides of the board body, and a powder catcher attached to the bottom of the board body at the installation target location,
A step of attaching a pasting tool made of double-sided tape and adhesive to the back side of a wooden base material, and pasting this base material to the area where the frame material and powder receptacle are present;
a step of pasting a sheet material made of a magnetic material on the surface of the pasted base material;
a step of pasting a surface material made of iron material that has been coated and made into a sheet onto the surface of the sheet material;
After that, the board has a three-layer structure, and these three layers are formed into a rectangular shape to form an ultra-thin board body with a thickness of 5 mm or more and 10 mm or less,
a step of attaching a powder receiving box to a pair of powder receiving box storage bodies provided at both ends of the powder receiving box;
A method for constructing an ultra-thin writing and bulletin board, comprising: The ultra-thin writing device according to claim 3, wherein the board body, the frame material, the powder receiver, the powder receiver box storage body, and the powder receiver box are formed using a noncombustible material or a flame retardant material. - Construction method of bulletin board.

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