JPH0722234A - Magnet type paper stopper - Google Patents

Abstract

PURPOSE:To provide a stopper for temporarily stopping a paper or a sheet to a bulletin board using a permanent ring magnet. CONSTITUTION:A pair of permanent ring magnet 1 and an iron ring plate 2 applied tightly to one end face thereof is fitted in a nonmagnetic case 3. The case 3 has a protrusion 6 at the outer corner part thereof, a gently curved upper surface 5, and a recess 7 made in the ceiling part to be fitted with a jig, and a sheet material is applied to the attracting surface of the magnet 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an attraction fixture using a permanent magnet, and is a fixture for temporarily fixing paper, cloth, wood, plastics, sheets and sample products to steel, boards and bulletin boards. Regarding

[0002]

2. Description of the Related Art Conventionally, pushpins, adhesive tapes, etc. have been used for fixing various kinds of guides and notices such as public notices and posters. In recent years, an attracting fixture using a permanent magnet has been used due to an increase in objects to be attracted such as steel office equipment, furniture, and boards. FIG. 2 shows a conventionally used attraction type fixing device, in which a disk-shaped sintered magnet 11 is attached to a case 31 molded of synthetic resin by an adhesive 10.
Is a fixed assembly and is disclosed in Japanese Utility Model Publication No. 58-55627. The concave case made of synthetic resin has a side surface of the magnet 11 fitted to the outer cylinder 32 of the case, and an upper portion of the magnet 11 of the inner cylinder 33 is fitted and fixed with the adhesive 10. An adhesive is applied for adhesion, and an annular groove 12, a convex step 13, or a concave step 14 is formed and joined so that the adhesive does not flow out.

[0003]

SUMMARY OF THE INVENTION According to the present invention, a permanent magnet is formed integrally with other parts without using such an adhesive agent and without processing grooves or irregularities on the magnet. It has a spring-like shape that can be easily removed with your fingertips, and uses a ring-shaped magnet that can obtain a stable magnetic field. A sheet material is attached to the suction surface of the body to prevent scratches on the board surface and furniture surfaces. In addition, the upper surface of the surrounding case is a gently curved surface that is close to a flat surface, and writing with a marking pen, affixing a mark sheet, printing, etc. are possible, and in particular, consideration is given to multicolor printing. In the conventional fixture shown in FIG. 2,
The use of an adhesive has a drawback that the manufacturing process is complicated, such as processing grooves and unevenness on the magnet. Further, the present invention solves such drawbacks such as a slight increase in magnetic force.

[0004]

According to the present invention, a ring-shaped permanent magnet is housed in a non-magnetic enclosure case that surrounds a part of the ring-shaped iron plate via a ring-shaped iron plate, and a sheet material is attached to the attraction surface of the magnet. It is a magnet type fixture.

[0005]

According to the present invention, a pair of a magnet and an iron plate is housed in an enclosing case to enhance the attractive force, and a finger-hanging protrusion for easy removal is provided at the corner where the case and the upper surface and the outer surface intersect. Even in the interior, printing or painting can be performed on the upper surface by providing a recess for fixing the jig of the device in the central ceiling. In addition, a sheet material is attached to the magnet attracting surface so as not to scratch the attractor.

[0006]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is an assembly cross-sectional view (shown in FIG. 1A) of the present embodiment, and 1 is a ring-shaped magnet (shown in FIG. 1C).
Reference numeral 2 denotes an iron plate slightly larger than the magnet (shown in FIG. 1B), which is an end face N on the side opposite to the attracting surface S, that is, a ring-shaped iron plate without using an adhesive on the upper surface of the ring magnet 1 in the drawing. Two
Are closely attached, and these are paired to form an enclosure case 3 as shown in FIG. 1A on the outer circumference of the magnet and the end surface on the iron plate side. The case upper surface 5 has a shape of a gentle curved surface close to a flat surface, and the inner ceiling portion of the case 3 is provided with a recess 7 for fitting with a jig of each model. In addition, the projection 6 is provided on the entire circumference of the corner where the outer circumference and the upper surface of the surrounding case 3 intersect, and the sheet material 8 (shown in FIG. 1D) is attached to the attraction surface that is the end surface of the magnet 1.

With this structure, the magnet 1 built into the fixture includes an alnico magnet, a ferrite magnet molded and sintered in a ring shape, a rare earth magnet and an Nd magnet, and a synthetic resin or rubber. A permanent magnet such as a bond-based magnet that is blended and extruded and rolled is used. When the iron plate 2 is press-punched so that the outer side is slightly larger and the inner side is slightly smaller so as to fit the end face of the magnet 1, the punched part is blunted and the corners are rounded to form an R shape 2a, and the opposite side has a return 2b. Can be formed (shown in FIG. 1 (e)). Therefore, this return works effectively to bring the magnet 1 into close contact, and the magnet 1 is fixed to the end surface of the magnet without an adhesive.

The magnet 1 and the iron plate 2 are paired to form an enclosure case 3 on the outer periphery of the magnet 1 and about half or more of the end surface on the iron plate 2 side. The magnet 1 to the mold (not shown) of the injection molding machine
And a pair of iron plates 2 are inserted, the central part of the ring-shaped magnet is fitted to the shaft of the mold, the mold is closed, and the plunger of the molding machine is used to press the resin into the cavity forming the enclosure case 3 in the mold. It At the same time when the mold is opened, the magnet 1 and the iron plate 2 are paired and housed in the surrounding case 3 and extruded. By cutting the gate port at the time of injection, a temporary shape can be created as a magnetic fixture. (However, since it is not magnetized, it does not adsorb.) However, in order to use it not only as a fixture but also as a product in various fields, various things are carried out in order to improve the finish and product value.

For example, magnets are attracted to iron-based desks, office machines, home appliances and bulletin board boards, but the surface of the magnet is rather rough before that. Since the surface of the attracted body is usually painted, it is flat and smooth, and if a magnet with a rough surface is used, the painted surface will be scratched. In addition, the magnet sometimes adsorbs dust or iron powder on the surface of the magnet while it is being used, which may cause scratches or even hook grooves on the painted surface. Therefore, in the present invention, the application to the magnet end surface is also described as an example, but what is more effective is that by sticking the cloth or the sheet material 8, it is possible to prevent the iron powder from adhering to the rough surface of the magnet 1 or the magnet end surface, and the adsorption. Prevents damage to the body. Further, the cloth or sheet material 8 may be one in which fibers are transplanted and also serves as a cushioning material for the adsorbent, so that the magnet surface itself cannot be seen, and the product value is improved if the material color of the cloth or sheet material is taken into consideration.

Further, the upper surface of the surrounding case 3 has a gentle curved surface close to a flat surface, and writing with a marking pen, sticking of a mark sheet, and printing with a printing machine are possible on this surface. Needless to say, multicolor printing is also taken into consideration from the beginning, and a concave portion 7 (corner shape) to which a jig for a printing machine can be fixed is provided on the inner ceiling portion of the surrounding case 3. As a result, the position in one direction is determined, and the disk-shaped surrounding case is fitted into the jig one after another, thereby enabling multicolor printing.

Further, the conventional fixture has a substantially semicircular cross section as shown in FIG. 4, and the outer surface is slippery so that the fingertips are strongly pressed against the adsorbent body 9 even when the fixture is removed. I had to pull the nails with force from three directions. On the other hand, in the present invention, the protrusion 6 is provided on the entire circumference at the corner where the side face and the curved portion intersect, and since the position is also at the upper part, most of the fingertips hit the protrusion 6,
The direction of the force may be the direction of the arrow (X) as shown in FIG. 3, and the force can be applied to the tensile force so that it can be sufficiently removed in two directions, but the three directions have good stability and can be removed. In addition, the portion below the overall projection 6 has a reverse taper shape, which is good for finger contact, and is easy to remove as a fixture. In some cases, the reverse taper portion can be colored, printed, or engraved.

Moreover, since the iron plate is also used in the magnetic circuit, the magnetic force is enhanced. Since it is a ring-shaped magnet, the magnetic field also flows from one side to the other side even if it exceeds the central hole, so that the magnetic force is largely acting, and the magnetic force is effectively used. Regarding the effect of the iron plate, Table 1 shows measured magnetic force values when only the ring-shaped magnet (magnet alone) and the iron plate were actually attached (magnetization with integrated yoke).

[0013]

[Table 1]

From the above-mentioned measurement results, the attraction force is 31.2% higher in the case where the iron plate is attached to the magnet than the magnet alone. Similarly, FIG. 5 and FIG. 6 show the respective surface magnetic flux density waveforms in the case where only the ring-shaped magnet (magazine net alone) and the iron plate are inserted (yoke integrated magnetization). Comparing FIG. 5 and FIG. 6, the magnet with the iron plate inserted (S side in FIG. 6) is
It has been confirmed that the surface magnetic flux is improved by 5.3%. In the present invention, the finger-hooking projection is provided on the entire circumference, but it may be provided on a part of the circumference, and a design shape suitable for printing on the upper surface may be provided.

[0015]

As described above, the present application has the following effects by using the iron plate on one end surface of the ring-shaped magnet. 1. The use of ring-shaped magnets has adsorption surfaces on both sides,
It was substantially enlarged, and the adsorption force was increased by 30% or more by using an iron plate on the end face. 2. With the finger-hanging protrusions at the corners formed on the upper surface and the upper side surface of the surrounding case, the magnet can be easily removed without slipping. 3. By making the upper surface of the enclosure case a gentle curved surface close to a flat surface, various printings can be performed and multicolor printing is also possible. 4. By attaching a sheet material to the attracting side of the magnet end face, the commercial value of the fixture itself is increased and the attracted face is not scratched.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, (a) is a sectional view thereof,
(B) is a sectional view of an iron plate, (c) is a sectional view of a magnet, (d)
Is a sectional view of the sheet material, and (e) is a partially enlarged sectional view of (b).

FIG. 2 is a cross-sectional view of a conventional example of a suction tool,
(B) (c) is sectional drawing which shows another magnet shape.

FIG. 3 is a diagram illustrating a usage situation of the present invention.

FIG. 4 is a diagram illustrating a usage situation of a conventional example.

FIG. 5 is a diagram illustrating a surface magnetic flux density waveform of a conventional example.

FIG. 6 is a diagram illustrating a surface magnetic flux density waveform of the action of the present invention.

[Explanation of symbols]

1 magnet, 2 iron plate, 3 enclosing case, 4 outer surface, 5
Top surface, 6 protrusions, 7 recesses, 8 sheet material

Claims (4)

[Claims] 1. A magnet type fixing characterized in that a ring-shaped permanent magnet is housed in a non-magnet enclosing case, a part of which is surrounded by a ring-shaped iron plate, and a sheet material is attached to the attracting surface of the magnet. Ingredient 2. The magnet-type fixture according to claim 1, wherein the enclosing case is provided with projections at the corners formed by the intersection of the outer side surface and the upper surface over the entire circumference thereof. 3. The magnetic fixture according to claim 2, wherein the upper surface of the enclosure case has a gently curved surface close to a flat surface, and a concave portion into which a jig of each model is fitted is formed on the inner surface ceiling portion. 4. A magnet type fixture formed by closely contacting a ring-shaped iron plate with one end surface of a ring-shaped permanent magnet, and integrally molding it with a non-magnetic case that surrounds the outer circumference of the magnet and the outside of the iron plate.