JPS6315902Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a bulletin board that uses a magnetic plate as a substrate.The purpose of this invention is to use the magnetic adsorption pieces to fix the information paper attached to the surface of the bulletin board using the adsorption force of the magnetic adsorption piece. The purpose of the present invention is to provide a wall board for a bulletin board, etc., which has enhanced suction power and also allows the use of conventional push pins.

Conventional bulletin boards have been made by fixing information sheets by pricking them with push pins, by fixing them onto a flat plate made of magnetic material using adhesion pieces made of magnets, or by attaching magnetic material or magnetized material to a flat bulletin board made of magnetic plates. Some used magnetic adsorption plates. Among these, fixing with push pins has been widely used in conventional practice and is also easy, so it is thought that it will continue to be used in the future. However, in cases where magnets are used for either or both of the bulletin board body and the suction piece, there are problems in terms of suction power, such as the information paper once fixed moving or the suction piece falling off. . Particularly, as shown in FIGS. 4 and 5, when the magnetic attraction piece 7 is attracted to the surface of the magnetic board 6 via the information paper 5 (FIG. 4), the magnetization direction of the magnetic attraction piece 7 is NS in the thickness direction of the piece
It was limited to whether the suction piece 8 could constitute a pole or could have only one NS pole each in the longitudinal direction of the plane as shown in FIG. Therefore, when the attraction piece 8 is attracted, there is insufficient contrast between the two NS poles on the magnetic substrate 6, and furthermore, if the magnetic substrate is made of an extremely thin magnetic material, the magnetic flux density due to the magnetic lines of force is small. This was a cause of weak adsorption power.

This invention solves the above-mentioned difficulties,
The configuration will be explained below with reference to the drawings.

1 is a magnetic substrate, which is a flat plate made of a magnetic material with a thickness of 0.25 to 1.2 mm, and is magnetized alternately with north and south pole lines in a straight line at intervals of about 2.5 to 4 mm in a certain direction. be. The letters N and S in the drawings indicate magnetized poles, and the vertical dash-dot lines indicate the magnetized state. Reference numeral 2 denotes a coating layer formed on the surface of the magnetic substrate 1, which is made of vinyl chloride or other synthetic resin sheet or cloth, and may contain a magnetic material such as barium ferrite powder. Reference numeral 3 denotes a magnetic thin plate layer such as an ultra-thin steel plate provided on the back side of the magnetic substrate 1, which has a suitable thickness of about 0.05 to 0.15 mm. The three magnetic thin plate layers 3 are integrated to form a bulletin board body. Reference numeral 4 denotes a magnetic adsorption piece, which is magnetized alternately with north pole lines and south pole lines at intervals in a straight line in the same direction as the magnet board 1 of the bulletin board body. The dashed-dotted lines in the figure indicate magnetized magnetic poles. 5 is an information paper for bulletin boards.

Since the present invention has the above-described configuration, the poles of the magnetic attraction piece 4 are attracted to the magnetized poles of the magnetic substrate 1 with the north and south pole lines corresponding to each other. The magnetized state on the magnetic substrate and magnetic attraction piece is such that each pole is alternately magnetized in a straight line with a constant interval of about 2.5 to 4 mm, so that the corresponding poles work to attract each other. In particular, in the case of the present invention, since the magnetic thin plate layer 3 is on the back side of the magnetic substrate, the magnetic flux density due to the magnetic poles of the magnetic substrate increases, and the magnetic flux due to the magnetic poles of the magnet adsorption pieces 4 attracted to the front side is also added. A synergistic adsorption effect appeared and the adsorption force was strengthened. If the magnetic thin plate layer 3 did not exist, the magnetic flux density would be low and the attraction force might be inferior, but the effect of this magnetic thin plate layer is large and the magnetization method of the magnetic attracting piece 4 is The feature is that it is made the same as the substrate 1. Depending on the state of use, the magnetic attraction pieces 4 may be in a state where their magnetization directions cross each other, but as mentioned above, due to the magnitude of the magnetic flux density due to the magnetic thin plate layer, there is an effect that the magnetic attraction pieces 4 are aligned in naturally matching directions when attracted. be.

Furthermore, if the synthetic resin sheet 2 on the surface side of the magnetic substrate 1 contains magnetic powder such as ferrite powder, the air gap in this surface coating layer will also be eliminated and the concentration of magnetic flux will be further promoted.

As mentioned above, in the present invention, the north and south pole lines spaced apart in a straight line are alternately magnetized, and correspondingly, the magnetic attraction pieces that are attracted are also magnetized in the same way. Since the two are combined, the adsorption effect of different polarities on the opposing surfaces works synergistically, and the concentration of magnetic flux by the magnetic thin plate layer on the back side works efficiently, which serves to strengthen the adsorption property. As a result, the effect of fixing the information paper by suction is ensured. In addition, since the magnetic substrate 1, magnetic thin plate layer 3, etc. use ultra-thin plates of 0.25 to 1.2 mm and 0.05 to 0.15 mm, a commonly used push pin or push pin can be used instead of the magnetic adsorption piece 4. It is possible to fix information sheets, etc. to the bulletin board body using this method, and there is an advantage that conventional methods can also be used. It should be noted that although the above description has been made with respect to a bulletin board, the present invention is not limited thereto and can also be applied to a wall board.

[Brief explanation of the drawing]

FIG. 1 is a front view of the bulletin board of the present invention, with a portion peeled off to show each layer. Figure 2 is an enlarged sectional view of the same part.
Figure 3 is a front view of a magnetic adsorption piece, Figure 4 is a partial cross-sectional view of a bulletin board using a conventional magnetic plate,
FIG. 5 is a front view of the suction plate used in the conventional example. 1... Magnetic substrate, 2... Synthetic resin sheet or cloth, 3... Magnetic thin plate layer, 4... Magnetic adsorption piece, 5... Information paper.

Claims (1)

[Scope of claims for utility model registration] (1) A flat plate made of magnetic material with a thickness of 0.25 to 1.2 mm,
A magnetic substrate is provided in which north and south pole lines are alternately magnetized in a straight line at intervals of about 2.5 to 4 mm in a certain direction, and a vinyl chloride resin or other synthetic resin sheet or cloth is placed on the surface of this magnetic substrate. A thin magnetic plate layer such as an ultra-thin steel plate with a thickness of about 0.05 to 0.15 mm is provided on the back side of the magnetic substrate to form a bulletin board body that integrates the three components, and the coating layer It is characterized by adsorbing and combining magnetic adsorption pieces, which are made by alternately magnetizing N-pole lines and S-pole lines at intervals in a straight line in the same direction as the magnetic substrate, on the surface of the magnet. Wall boards for bulletin boards, etc. (2) A wall panel such as a bulletin board as set forth in claim 1 of the utility model registration claim, in which a coating layer made of a synthetic resin sheet or cloth contains magnetic powder such as barium or ferrite.