JPH1178366A - Method for reupholstering blackboard - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate a reupholstering with an unused surface material by laminating a double-sided magnetized magnet sheet on used surface of steel sheet of an existing blackboard by a magnetic attraction force of its one surface side, and laminating the unused surface material of steel sheet on the surface of the magnet sheet by a magnetic attraction force of the other surface side of the magnet sheet. SOLUTION: After an edge frame 7, powder tray 9 and the like are removed, a double-sided magnetized magnet sheet 12 having a thickness of about 0.5 to 1.0 mm previously cut in the same size (a length of 3500 m and a height of 1200 mm) as retaining used surface material 5 is laminated on a surface of the material 5 by a magnetic attraction force of one surface side operating between the sheet 12 and the material 5. Then, unused surface material 13 having the same size as the material 5 and made of a coated steel sheet or enameled steel sheet having a thickness of about 0.3 to 0.5 mm is laminated on a surface of the sheet 12 via a release sheet 14 made of synthetic resin by a magnetic attraction force of the other surface side operating between the material 13 and the sheet 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for replacing a surface material of a blackboard (including a white board).

[0002]

2. Description of the Related Art Conventionally, when a surface material forming a writing surface of a blackboard is damaged or worn out for a long time and becomes unusable, the old surface material is left without being removed. An adhesive method is known in which an adhesive is applied to the surface of the old surface material, and a new surface material is adhered to the old surface material via the adhesive.

[0003]

However, in the above-mentioned conventional re-placing method, an adhesive is used to attach a new surface material to the old surface material, so that the adhesive solidifies in the attaching operation. It is necessary to press the new surface material against the old surface material with a certain pressure until the new surface material is raised on the old surface material, especially in the case of large blackboards installed in school classrooms etc. In some cases, it is difficult to uniformly apply the entire new surface material to the old surface material, and the attaching work requires a great deal of time and effort.

The present invention has been made in view of the above problems, and enables a new surface material to be uniformly adhered to the old surface material of an existing blackboard over the entire surface in a short time, thereby facilitating the attachment operation. It is intended to provide a re-placing method that can be performed.

[0005]

According to a first aspect of the present invention, there is provided a method for replacing a blackboard, comprising:
Then, a magnet sheet 12 having both surfaces magnetized is adhered to the surface of the magnet sheet 12 by a magnetic attraction force, and a new steel sheet material 13 is applied to the surface of the magnet sheet 12 by a magnetic attraction force at the other surface of the magnet sheet 12. It is characterized in that it is adhered by the following.

The magnet sheet 12 is made of a flexible plate material which is magnetized so as to have a magnetic attractive force on both sides of the sheet by incorporating a magnetic material such as ferrite in a polymer material which is a synthetic resin material such as vinyl chloride. This flexible plate is generally known as a magnet sheet. The magnet sheet also includes a single-sided magnetized magnet sheet magnetized to have a magnetic attraction on one side of the sheet, but the magnet sheet 12 used in the method of the present invention includes:
The sheet is magnetized to have magnetic attraction on both sides. When the magnet sheet 12 is applied to the old surface material 5 of the existing blackboard, the magnet sheet 12 is brought into contact with the old steel sheet surface material 5 by the magnetic attraction acting on one side thereof. The magnet sheet 12 is fixed to the surface 5 and a new steel sheet material 13
Is applied, the new surface material 13 is fixed to the magnet sheet 12 by the magnetic attraction force acting on the other side acting between the new surface material 13 and the magnet sheet 12, and thus the new surface material 1
3 is attached to the old surface material 5 via the magnet sheet 12.

According to the method for changing the blackboard according to the second aspect of the present invention, after removing the edge frames 7, 8 and the powder receiver 9 from the periphery of the existing blackboard, both surfaces of the old steel plate surface material 5 are magnetized. The magnetic sheet 12 is attached to the old surface material 5 by magnetic attraction on one surface side.
On the surface of No. 2, a new surface material 13 made of a steel plate was adhered to the magnet sheet 12 by the magnetic attraction on the other side, and thereafter, the edge frames 7, 8 and the powder receiver 9 were attached around the blackboard. It is characterized by the following. Therefore, in the blackboard having the edge frames 7, 8 and the powder receiver 9, the edge frames 7, 8 and the powder receiver 9 are removed before the surface material is replaced, and they are attached after the new surface material 13 is attached. I just need.

According to a third aspect of the present invention, in the method for changing a blackboard according to the first or second aspect, the surface of the magnet sheet 12 adhered to the old surface member 5 by magnetic attraction force on one surface side is made of synthetic resin. The present invention is characterized in that a new steel sheet surface material 13 is adhered to the magnet sheet 12 by a magnetic attraction force on the other surface side between the magnet sheet 12 and the intermediary sheet 14. If this release sheet 14 is used, the new surface material 13
When removing the magnet sheet 12, the new surface material 13 can be easily peeled off from the magnet sheet 12, and the magnet sheet 12 is not damaged.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a large blackboard set in a classroom of a school, which is replaced with a new surface material. This blackboard has a length of, for example, 3600 mm and a height of, for example, 1200 mm. Shall be. FIG. 2 is an enlarged cross-sectional view of the existing blackboard before the replacement, in a direction orthogonal to the longitudinal direction, FIGS. 3 and 4 are enlarged cross-sectional views of the same blackboard during the replacement.
FIG. 5 is an enlarged sectional view of the blackboard after the replacement.

In FIG. 2 showing an existing blackboard before re-placing, reference numeral 1 denotes a substrate formed of a veneer plywood having a thickness of, for example, 5 mm. This substrate 1 is composed of a peripheral frame 2 and a middle rail disposed in the middle thereof. 3 is attached to the wooden underframe 4 with an adhesive or nailing. 5 is 0.3mm thick
An old surface material made of a painted steel plate or an enameled steel plate having a thickness of about 0.5 mm, which is adhered to the surface of the substrate 1 with an adhesive 6. Reference numerals 7 and 8 denote aluminum edge frames attached to the upper edge and both right and left edges of the blackboard, and reference numeral 9 denotes an aluminum powder receiver attached to the lower edge of the blackboard, for example. The blackboard is fixed to the wall surface W of the classroom via mounting brackets 10 and 11 mounted at a plurality of locations around the underframe 4.

Next, a method for replacing a blackboard surface material according to the present invention will be described with reference to FIGS.

First, as shown in FIG. 3, the edge frames 7, 8 and the powder receiver 9 are removed from the periphery of the existing blackboard. In this case, since the edge frames 7 and 8 are attached to the underframe 4 with screws (not shown), the screws are removed, and the powder receiver 9 is inserted into the lower mounting bracket 11. Since the screw (not shown) is fixed to the metal fitting 11, the screw may be loosened and removed from the mounting metal 11.

After removing the edge frames 7, 8 and the powder receiver 9 as described above, the same dimensions (length 3) as the remaining old surface material 5
A double-sided magnetized magnet sheet 12 having a thickness of about 0.5 mm to 1.0 mm, which has been cut in advance to a thickness of about 600 mm and a height of 1200 mm, is placed on the surface of the old surface material 5. The magnet sheet 1 is adhered by the magnetic attraction force acting on one side between the magnet sheets.
2, a new surface material 13 of the same size as the old surface material 5 made of a coated steel sheet or an enameled steel sheet having a thickness of about 0.3 mm to 0.5 mm is attached to a release sheet 14 made of synthetic resin.
Is applied by the magnetic attraction of the other surface acting between the new surface material 13 and the magnet sheet 12.

The magnet sheet 12 is made of a flexible plate material in which a magnetic material such as ferrite is contained in a polymer material which is a synthetic resin material such as vinyl chloride so as to have a magnetic attraction on both sides of the sheet. The flexible plate is generally known as a magnet sheet. There is also a single-sided magnet sheet which is magnetized to have a magnetic attraction on one side of the sheet, but this magnet sheet 12 is a double-sided magnetized sheet having a magnetic attraction on both sides of the sheet. It is a magnetic magnet sheet. The peeling sheet 14 is provided so that the new surface material 12 adhered to the old surface material 5 via the magnet sheet 12 is replaced with a new surface material so that the magnet sheet 12 is not damaged. The peeling sheet 14 is a sheet material made of polypropylene having a thickness of, for example, about 0.05 mm to 0.1 mm. Even without using such a peeling sheet 14, the new surface material 13 can be peeled off from the magnet sheet 12 against the magnetic attraction force. 13 can be easily removed.

FIG. 4 shows a state in which the magnet sheet 12 is adhered to the old surface material 5 of the existing blackboard as described above, and a new surface material 13 is attached to the magnet sheet 12 via the peeling sheet 14.
The refilling operation is completed by attaching the edge frames 7, 8 and the powder receiver 9 around the blackboard as shown in FIG. 5, and the blackboard in the refilled state is shown in FIG. Shown in In this case, the edge frames 7, 8 and the powder receiver 9
For example, the old frame or powder receiver of the existing blackboard may be attached as it is, or a new one may be attached to each.

In the above-mentioned work for replacing the surface material of the blackboard, the magnet sheet material used for the magnet sheet 12 is as follows.
It is preferable to bring a long thing of the same standard size as the height of the blackboard to the site, cut it to a predetermined length on the site, and use it. It is better to prepare a plurality of cut pieces and add them in the width direction.

The coated steel sheet or the enameled steel sheet used for the new surface material 13 may be cut into the same dimensions as the old surface material 5 in advance in a factory or the like and wound up in a coil shape and brought to the site. Then, a new surface material 13 made of a coated steel sheet or an enameled steel sheet wound in a coil shape is used.
When attaching to the surface of the magnet sheet 12 adhered to the old surface material 5, the coil-shaped surface material 13 may be attached to the magnet sheet 12 while being developed gradually into a planar shape.
At this time, the surface material 13 made of a steel sheet is transferred to the magnet sheet 1.
2, the surface material 13 is naturally attracted to the magnet sheet 12 by the magnetic attraction force acting between the steel sheet surface material 13 and the magnet sheet 12, so that the attaching operation becomes easy. Thus, the new surface material 13 can be uniformly joined to the entire old surface material 5 via the magnet sheet 12 in a short time.

According to the blackboard in which the new surface material 13 is adhered to the old surface material 5 via the magnet sheet 12 which is magnetized on both sides as described above, the magnet sheet 12 exerts a sound deadening effect. The writing sound of the writing implement such as is low, and does not hinder the user and surrounding people.

If a new surface material 13 made of steel sheet is adhered to the surface of the magnet sheet 12 adhered to the old surface material 5 as described above via a release sheet 14 made of synthetic resin, When the surface material 13 is replaced with a new surface material again, the surface material 13 is removed from the magnet sheet 12.
When peeling off the magnetic sheet against the magnetic attraction force, the peeling sheet 14 facilitates the peeling operation, and does not damage the magnet sheet 12.

[0020]

According to the method of the present invention, a double-sided magnet sheet is adhered to an old steel plate surface material of an existing blackboard by a magnetic attraction force on one side of the sheet material. , A new steel sheet surface material is attached by magnetic attraction on the other side of the magnet sheet.
New surface material through magnet sheet to old surface material,
Since the sticking is performed by the magnetic attractive force acting between the old surface material, the magnet sheet and the new surface material, the work of replacing the new surface material can be performed easily in a short time.
In addition, when attaching the new surface material, the new surface material is naturally absorbed by the magnetic attraction force between the two without having to strongly press the new surface material onto the magnet sheet. Can be uniformly and closely adhered to the entire surface of the old surface material, thereby forming a good writing surface.

Further, when replacing the surface material re-attached as described above with a new surface material, the surface material attached to the magnet sheet may be peeled off against the magnetic attraction force. It is easy to change the work again. Also, at the time of the first replacement of the surface material, if the surface material is adhered to the surface of the magnet sheet via a release sheet made of synthetic resin, the replacement of the surface material from the magnet sheet when replacing the surface material again The work of peeling off the surface material becomes easy, and the magnet sheet is not damaged.

In the blackboard re-covered by this method, since the magnet sheet exerts a sound-muffling effect, when the blackboard is used, the writing sound of a writing instrument such as a chalk is low, which may be annoying to the user and surrounding people. Absent.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the appearance of a blackboard that has been replaced with a new surface material by the method of the present invention.

FIG. 2 is an enlarged cross-sectional view of an existing blackboard before re-covering, which is cut in a direction orthogonal to a longitudinal direction.

FIG. 3 is an enlarged cross-sectional view of the blackboard during re-covering.

FIG. 4 is an enlarged cross-sectional view of the blackboard at a stage where a surface material replacement operation has been completed.

FIG. 5 is an enlarged cross-sectional view of the blackboard after the completion of the replacement work.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate 4 Underframe 5 Old surface material 6 Adhesive 7,8 Edge frame 9 Powder tray 12 Double-sided magnetized magnet sheet 13 New surface material 14 Peeling sheet

Claims (3)

[Claims] 1. A magnet sheet having both surfaces magnetized is adhered to an old steel plate surface material of an existing blackboard by a magnetic attraction force on one side thereof, and a new steel plate surface material is attached to the surface of the magnet sheet. A method of replacing a blackboard that is attached by the magnetic attraction of the other side of the magnet sheet. 2. After removing an edge frame and a powder tray from the periphery of an existing blackboard, a magnet sheet having both surfaces magnetized is attached to the old steel plate surface material by magnetic attraction of one surface thereof, A method of replacing a blackboard in which a new steel plate surface material is adhered to the surface of the magnet sheet by magnetic attraction on the other side of the magnet sheet, and then an edge frame and a powder receiver are attached around the blackboard. 3. A new steel sheet material is applied to the surface of the magnet sheet adhered to the old surface material by a magnetic attraction force on one surface via a synthetic resin release sheet on the other surface of the magnet sheet. 3. The method according to claim 1, wherein the blackboard is attached by suction.