JPS6341202B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is designed to simultaneously provide a magnetic shield in a stop using a permanent magnet and compensate for the attraction force that is reduced by this magnetic shield. The present invention relates to the provision of an extremely innovative engaging tool.

(Prior Art) This type of conventional engagement tool exposes the magnetic pole surface so that the magnetic pole surface of the magnet directly contacts a ferromagnetic plate that is removably attracted to the magnetic pole surface, or It was covered with a case made of non-magnetic material for impact resistance and decorative purposes.

(Problems to be Solved by the Invention) However, in the above-mentioned engagement tool, the lines of magnetic force that are blown from one magnetic pole surface of the magnet toward the other magnetic pole surface draw a large parabolic arc, so that the lines of magnetic force are The resulting magnetic field spread over a relatively wide range and caused magnetic disturbances to magnetically recorded materials.

Magnetic recording has become commonplace these days, and is not limited to use in special computers, but includes magnetic tapes for regular tape recorders, magnetic cards and carriers for various types of office work. These cards have come to be widely used as payment cards, credit cards for purchasing cards, and train tickets, and their destruction without one's knowledge has caused many problems. In particular, this type of recording means cannot be reproduced or restored in its original state, and it is nearly impossible to confirm what kind of recording was made on the original tape or card. If destroyed, it would be necessary to reproduce the original recording itself. In addition, without taking such rehabilitation procedures, it becomes impossible to make scheduled cash withdrawals, calculation of calculation results, etc. on the spot, and these inconveniences are extremely large, and it is necessary to induce the occurrence of such results. There was a need for an improvement in the stopper related to the use of magnets.

In response to such a request, it is also possible to shield the lines of magnetic force by attaching a ferromagnetic plate to the entire surface of the magnetic pole to prevent the lines of magnetic force from leaking from the surface of the magnetic pole, and forming a magnetic circuit for the lines of magnetic force. This method has been attempted, but although it shields the lines of magnetic force, it also reduces the lines of magnetic force that can be used for attraction, resulting in a decrease in the attraction force.

(Objective of the Invention and Means for Solving Problems) The present invention was devised to correct the various problems in the prior art, and its purpose is to provide a stopper using a permanent magnet. To prevent damage to magnetic records on magnetic cards, tickets, etc. caused by It is placed in a magnetic circuit located closer to the end face of the magnet, and is placed at a point that reliably prevents the erasure and destruction of cash cards, magnetic tickets, and various magnetic recording tapes when operating handbags, etc., and the magnetic pole surface is It was designed to suppress the reduction in the adsorption force that occurs when shielding with a ferromagnetic plate, and in order to simultaneously achieve these purposes, it was added to the magnetic pole face for the purpose of shielding the lines of magnetic force. By providing holes, grooves, or gaps in the ferromagnetic plate to be mounted, lines of magnetic force generated from the magnetic pole surface of the magnet exposed from the ferromagnetic plate and the holes, grooves, or gaps are connected to each other. The ferromagnetic plate has lines of magnetic force extending from the side edges of the facing ferromagnetic plate, so that a ferromagnetic plate detachably attached thereto can be strongly attracted.

In order to achieve appropriate and purposeful effects on these characteristics, the present invention has a structure in which a thick plate-shaped permanent magnet 1 has a ferromagnetic plate 2 attached to one magnetic pole surface a, and the other magnetic pole is In the engagement tool in which the ferromagnetic plate 5 is removably attracted to the surface b, the magnetic pole surface b of the permanent magnet 1
A ferromagnetic plate 3 that partially covers the surface of the magnetic pole face b is attached and fixed thereon.

(Example) Hereinafter, a typical example will be described in which details of the present invention are shown in the drawings. 1 is a permanent magnet,
When this is used as a single unit, a hole 1a is opened in the center that points from one magnetic pole face to the other magnetic pole face, and when two or more are combined, a gap corresponding to the hole 1a is created between each assembly. In either case, a ferromagnetic plate 2 is attached to one end face a of the magnetic pole face, and a ferromagnetic plate 3 is attached to the other end face b of the magnetic pole face, and these are attached to a cover 4 or the like. It is designed so that it can be fixed by holding it. Note that the cover 4 used as this fastening method is a container-like object with an open bottom surface, and bent pieces 4a to 4a for fastening are provided protruding from the edge of the opening, and a hole 4b is formed so as to recess a part of the upper part. Open the hole 4b, bend the edge of the hole 4b inward and downward, and attach the hole 1 of the magnet 1 to this.
Although the a-end is engaged, the cover 4 may of course be used partially if the cover 4 is not necessary due to the characteristics of the magnet 1, especially its impact resistance properties, etc. Naturally, the cases are also planned.

The ferromagnetic plate 3 that covers the engaging and disengaging end face of this permanent magnet 1, that is, the surface of the magnetic pole face b that is in contact with the ferromagnetic plate 5 that is detachably attracted to the magnet 1, has a circular shape in the magnet 1. The magnetic field of the arc-shaped lines of magnetic force is taken into this ferromagnetic plate 3, and the ferromagnetic plate 3 is made into a closed circuit of the lines of magnetic force, and at the same time, the lines of magnetic force are focused on the side edges of the air gap 3b in the ferromagnetic plate 3. A magnetic field of relatively short arc-shaped lines of magnetic force is created in an empty position, and the ferromagnetic plate 5 is positioned within the magnetic field of the focused lines of magnetic force, so that the ferromagnetic plate 5 is reliably attracted. .

The ferromagnetic plate 3 may be a single plate formed by punching or cutting a suitable plate as shown in FIGS. It is planned that the ferromagnetic plate 2 and other ferromagnetic plates 5 will be attached to each other in a combination of two plates 3 to 3. An unshielded air gap 3b that focuses the magnetic field to create a relatively short magnetic field.
- 3b are constructed by punching, cutting, or assembling.

In the structure of such a stop, the ferromagnetic plates 2 and 5 are
The ferromagnetic plates 2 and 5 are provided with ferromagnetic rods 2a to 5a protruding from each other so that they can be separately adsorbed and detached. provided, the ferromagnetic rods 2a, 5
a are attracted to each other, a case in which the ferromagnetic rod 5a protruding from the ferromagnetic plate 5 has a length that reaches the ferromagnetic plate 2, and the ferromagnetic rod 2a is omitted; and a case in which the ferromagnetic rod 2a is omitted. In the case where the ferromagnetic rod 2a protruding from the magnet 2 is extended to the other magnetic pole surface of the magnet 1 and the ferromagnetic rod 5a is omitted, other considerable design changes are planned. This is the ferromagnetic rod 2a,
In addition to the caulking shown in 5a, various methods such as soldering, brazing, spot welding, drawing, bending, etc. are planned depending on the purpose of use.

In addition, various means are planned for fixing the stopper main body having the magnet 1 and the ferromagnetic plate 5, respectively.One example is to attach the washer 6 having the mounting leg pieces 6a to 6a to the cover 4. The folded pieces 4a to 4a of
It is planned that the parts will be held in place by holding them in place, that they will be caulked, and that they will be directly attached by soldering, brazing, spot welding, etc.

In the embodiment shown in FIG. 3, part or all of the peripheral edge of the ferromagnetic plate 5 is bent to form an engaging edge 5a that engages with the peripheral surface of the magnet 1, and the embodiment shown in FIG. , the hole 1a of the magnet 1 and the ferromagnetic plate 3 as a means of fixing a pendant or the like.
A gap corresponding to the gap 3a is created by the cover 4, the magnet 1, and the ferromagnetic plate 3.

(Effects of the Invention) The present invention has the characteristic configuration described above, and the magnetic field of the relatively long arc-shaped lines of magnetic force of the magnet that is exposed when the stopper is engaged, that is, when the lid of a handbag, etc. is opened. is concentrated as much as possible and reorganized into a short parabolic arc to prevent the destruction of memories such as tickets or cash cards due to the action of the magnetic lines of force as much as possible. The magnetic force lines flowing from the air gaps 3b to 3b are focused on the side edges of the ferromagnetic plate 3 in the air gaps 3b, and the ferromagnetic plate 5 is positioned within the focused magnetic force lines to ensure that the magnetic force lines are attracted. It was designed to encourage them.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a typical embodiment of the present invention, FIGS. 2 to 4 are sectional views showing other embodiments,
5 and 6 are perspective views showing a ferromagnetic plate for shielding. In the figure, 1... permanent magnet, 2 to 3... ferromagnetic plate, 4... cover, 5... ferromagnetic plate, 6... washer.

Claims (1)

[Scope of Claims] 1. A ferromagnetic plate 5 is removably attracted to the other magnetic pole face b of a thick plate-shaped permanent magnet 1 having a ferromagnetic plate 2 attached to one magnetic pole face a. An engagement tool characterized in that a ferromagnetic plate 3 that partially covers the magnetic pole surface b of the permanent magnet 1 is attached and fixed on the magnetic pole surface b of the permanent magnet 1. 2. Claim 1, characterized in that the ferromagnetic plate 3 that partially covers the surface of the magnetic pole face b of the permanent magnet 1 is a flat plate with appropriate through holes or grooves bored or missing. Engagement tool according to section description. 3. Claim 1, characterized in that the ferromagnetic plate 3 that partially covers the magnetic pole face b of the permanent magnet 1 is an optional plurality of flat plates attached at a predetermined interval. Engagement tool according to section description.