JPS6016088B2 - Suction tool - Google Patents

Description

[Detailed description of the invention] This invention relates to the improvement of adsorbed odors using permanent magnets.

At present, various types of adsorption odors using permanent magnets have been put into practical use, but most of them have one pole of the permanent magnet adsorbed to the object, and the other pole surface is in contact with the object. A round-shaped auxiliary iron piece is fixed in contact with the permanent magnet, and an open magnetic path with low magnetic resistance consisting of the object to be attracted and the auxiliary iron piece is formed between the two poles of the permanent magnet, thereby increasing the attraction force. 1st
The figure shows one of the most common examples of this kind of suction tool, where 1 is a disk-shaped permanent magnet magnetized in the thickness direction, and 2 is a pot-shaped ferromagnetic magnet fixed with adhesive to the S pole surface of magnet 1. It's food. In this attracting shell, the north pole surface of the magnet 1 and the rising green 2a of the rice 2 are both attracted to other ferromagnetic silver (not shown) which is the object to be attracted, and the silver 2 and the object to be attracted are separated between the NS poles of the magnet 1. This creates a closed magnetic path with low magnetic resistance to obtain stronger attraction force. Incidentally, in recent years, with advances in unmanned bank counters and unmanned railway ticket gate operations, cashless cards or tickets with various information magnetically printed on them have begun to be used.

When such magnetically printed cards or tickets are exposed to an external magnetic field, the magnetically recorded information is easily destroyed.
For this reason, if an adsorbing odor using a permanent magnet as described above is used for a drawer drawer or a stopper for a handbag, the recorded information will be destroyed if such cards or tickets are brought carelessly close to the adsorbent. There is a blind. In other words, in the adsorption odor shown in Fig. 1, when adsorption occurs, the two poles of magnet 1 are short-circuited by the object to be adsorbed, and almost no leakage or magnetic field is generated. When the surface is open, a wide range of leakage magnetic field y is generated as shown in the figure. The object of the present invention is to reduce as much as possible the leakage magnetic field of adsorbed odors using permanent magnets, and to prevent the above-mentioned accidental destruction of magnetically recorded information.

FIG. 2 shows an embodiment of this invention in which the leakage magnetic field of the adsorbed odor shown in FIG. 1 is reduced, and the same numbers as FIG. 1 indicate the same thing.

Therefore, the novel structure of this embodiment is that a disk-shaped ferromagnetic shield 4 having approximately the same diameter is abutted against and fixed to the attraction surface (N-pole surface) of the disk-shaped permanent magnet 1. . This fixing method may be performed by bonding with an adhesive, screwing with a non-magnetic screw, or the like. As a result of this structure, the leakage magnetic field y between the NS poles of the magnet 1 is concentrated in the gap between the rising edge 2a of the pot-shaped ferromagnetic silver 2 and the green part 4a of the shield plate 4, as shown in the figure. However, the leakage magnetic field is reduced. Furthermore, the gap 3
is a gap such that no magnetic leakage occurs between the magnetic pole circumferential surface and the inner circumferential surface of the rising green, except that a magnetic path is formed between the circumferential edge of the magnetic pole surface and the upper edge of the rising green 2a.

Furthermore, the provision of the disc-shaped silver shield 4 also causes a slight decrease in the suction force of this suction tool.

The reason for this is that during adsorption, the magnetic flux between the two poles of the NS does not pass through the gap between the rising edge 2a and the trailing portion 4a, which have relatively high magnetic resistance, but passes through the path with the lowest magnetic resistance, that is, the object to be attracted that short-circuits the gap. It is from. Although the present invention has been described below with reference to Examples, the present invention can be applied to adsorbed odors using permanent magnets other than the Examples.

Note that the iron pieces used in the examples may be replaced with other ferromagnetic materials, such as nickel. Also shield silver 4
Although it is desirable to cover the entire attracting surface of the magnet, the leakage polar field can be sufficiently reduced by covering only the main part of the attracting surface.

[Brief explanation of drawings]

FIG. 1 shows a sectional view of a conventional suction tool. FIG. 2 shows a cross-sectional view of the adsorbed odor of this invention. In addition, 1 in the figure
...Permanent magnet, 2...Ferromagnetic metal, 3...Gap, 4...Shield silver. Figure 1 Figure 2

Claims (1)

[Claims] 1. The circumferential side of the ferromagnetic plate 2 fixed to one of the magnetic pole faces of the permanent magnet 1 is bent in the direction of the other magnetic pole face of the permanent magnet 1 through a magnetic gap 3 to form a rising edge 2a, and A ferromagnetic shield plate 4 having the same end area as the magnetic pole face is attached onto the magnetic pole face of the permanent magnet 1 which is not coated with the ferromagnetic plate 2, and the attached shield plate 4 and the magnetic shield plate 4 are A suction device characterized in that another ferromagnetic plate is magnetically attached to a rising edge 2a of a magnetic plate 2 in a detachable manner.