JPS5928717B2 - Engagement tool - Google Patents

Description

[Detailed Description of the Invention] The present invention is intended to particularly disclose a structure for reinforcing magnetic force in an engaging tool provided with a magnetic shield to suppress external leakage of lines of magnetic force in the permanent magnet used. .

Therefore, in this type of engagement tool using a permanent magnet, various efforts have been made to effectively draw out the magnetic force of the magnet used and provide an engagement tool with a high magnetic attraction effect. However, it was hard to avoid the feeling that they were heading towards each other.

Particularly, the disengagement of the engaged state due to the rapid attenuation of the magnetic force due to deviation and inclination of the magnetically attached surface has been considered to be a major drawback in this type of engaging tool using magnets.

In addition to the problem of strengthening the magnetic adhesion force, it is necessary to effectively deal with the problem of the destruction of magnetic recording parts caused by the recent increased use of magnetic recording systems, especially the daily use of cash cards, paper towels, etc. This is something that is almost being requested. Furthermore, since confirmation of the engagement state has been generally overlooked in engaging devices that use magnets, it is necessary to completely ensure magnetic attachment when the other male member is not inserted into the magnet hole. This often leads to unexpected release of the engaged part and the resulting loss of belongings.

The present invention has been devised especially in view of the disadvantages of the prior art, and aims to improve the magnetic attraction force by concentrating the magnetic flux at the end of the hole 1a, and also to reduce the sound of fitting due to the elastic engagement tube 8. Aiming for reliable generation and restoration of the separated state of the magnetically attracted surfaces due to outward tilting, the lack of magnetic force is assisted by the fitting function of the ordinary engaging elastic cylinder, and a stronger fixed state is created. This is how it was done.

Further, in the present invention, the strengthening of the engagement force and the magnetic shielding function are synchronized, and the structure is particularly devised so that both functions can be performed at the same time.

The details of the engaging device of the present invention will be described below with reference to a typical embodiment shown in the drawings. Reference numeral 1 is a permanent magnet, and an engaging hole 1a is opened from one magnetic pole surface to the other magnetic pole surface. It is something that

A ferromagnetic plate 2 is attached to one pole face of this magnet 1, and a magnetic shield plate 3 is attached to the other pole face excluding the hole 1a, and the plates 2 and 3 are made of non-magnetic plates. The case 4 is designed to be integrally fixed to the magnet 1, and the case 4 is basically fixed to the magnet 1 with the plate 2 and plate 3, and the outer periphery of the magnet 1. It has a cylindrical shape for the purpose of protecting the surface.

In addition, as an installation example of this case 4, as shown in FIG. 1 or 2, the end surface of the plate 3 excluding the hole 1a and the outer peripheral surface of the magnet 1 are covered with a cylindrical shape with a bottom. As shown in FIG. 3, there is a case where the bent edge 4a is engaged with the peripheral edge step 3a of the plate 3 and is housed in the same plane as the plane of the plate 3, and a case where the bent edge 4a is fitted in the same plane as the plane of the plate 3. Another structural example was planned in which the ridge was raised on three sides of the plate to form the associated edge tsuba.

Next, a ferromagnetic plate 5 that is magnetically and removably abutted on the surface of the plate 3 is separately prepared as the other engaging tool, and a ferromagnetic rod 6 protruding from the plate 5 is inserted into the plate 2 through the hole 1a. Alternatively, it may be magnetically attached and detachably brought into contact with the top end surface of the ferromagnetic rod 7 erected on the two surfaces of the plate.

In addition, each of the engaging tools has a washer 9 having bent leg pieces 9a to 9a for attaching to a handbag, etc., and is integrally fixed to the plates 2 and 3 using the rods 6 and 7, or is attached to the plate 2. It is integrally fixed with a case 4, and it is planned to use pins, bolts, caulked pipes, and other attachment means as the attachment means.

Next, a circumferential recess 1b into which the elastic engagement tube 8 having a separation groove 8a cut out between the tube ends is loosely fitted is provided on the inner wall of the hole 1a, and the engagement tube 8 is inserted into the recess 1b. The rod 6 is press-fitted.

Therefore, regardless of whether the engaging tube 8 is made of a ferromagnetic material or a non-magnetic material, as long as it has sufficient elasticity, there are no particular restrictions on the material. However, by using a ferromagnetic material, the magnetic shielding effect of the plate 3 is further promoted, and it also serves as a part of the structure of the magnetic closed circuit.

In addition, when this engaging cylinder 8 is made of a non-magnetic material, the rod 6
By avoiding direct contact with the inner wall surface of the hole 1a and creating a reliable magnetic closed circuit? It was designed to strengthen its sustenance. Next, the rod 6 is intended to be press-fitted into the engaging cylinder 8, and the head of the rod 6 is made into an expanded head end 6a, but the engaging cylinder 8 can be press-fitted without using such an engaging means. It was also planned to provide a simple close fit to the 8.

The concave portion 1b is constructed as a gap between the end of the plate 3 or the case 4 and the plate 2.

In addition, the plate 5 in the embodiment shown in FIG. 4 where the bent edge 4a of the case 4 is raised as a shoulder to form an engaging edge flange is as follows.
The dimensions are such that it fits within this edge 4a.

Also, by folding the plate 3 into the hole 1a as shown in FIG. 5, a concave portion 1b is created by the folded edge 3b,
This edge 3b enhances the magnetic shielding effect, and in particular, prevents accidents caused by lines of magnetic force generated between the edge 3b of the plate 3 and the rod 7 as much as possible.

Regarding magnetic shielding, in FIG. 6, the circumferential edge of the plate 3 is bent as a bent edge 3c to prevent accidents caused by lines of magnetic force generated between the plate 3 and the plate 2 as much as possible.

In addition, in the embodiment shown in FIG. 7, in order to ensure smooth engagement of the rod 6, the surface of the plate 3 is inclined toward the hole 1a, so that the rod 6 can be surely engaged with the hole 1a. This guarantees good fit and good plating.

Furthermore, in the embodiment shown in FIGS. 8 and 9, the top end surface of the rod 6 is a convex spherical radiused surface, and the joint surface of the plate 2 or the rod 7 that comes into contact with this is provided with a corresponding concave spherical surface. The upper rounded surface is provided to reliably prevent the joining end surfaces of the rods 6 from being separated due to the inclination of the plate 5.

Next, the embodiments shown in FIGS. 10 and 11 show an example in which the above-mentioned engaging tool is used for a buckle, etc., and in particular, one side edge of the plate 2 is extended laterally to form an engaging part such as a band. 2a, and one or both side edges of the plate 5 are bent to form an engaging portion 5a and an engaging portion 5b.

Furthermore, the embodiment shown in FIG. 12 shows a special case of mounting the plate 5, and has a structure in which the mounting plate 10 is bent and crimped onto a base plate of a bag or the like.

The present invention is capable of achieving specific effects on the above-mentioned characteristics through the characteristic structure described above. In addition to preventing the dissipation of the magnetic lines of force, if necessary, a case 4 made of a non-magnetic material is placed on the surface of the plate 3 to further ensure the effect of magnetic shielding. Furthermore, plate 3
By forming the edges of the case 4 into the folded edge 3b and the bent edge 3c, the magnetic shielding effect is further promoted, and by making the engaging tube 8 of a ferromagnetic material, the edge 4a of the case 4 can be As a result of this protrusion, the magnetic shielding effect is almost complete. Next, by bringing the plate 3 and the rod 7 close together, lines of magnetic force are focused on that part to improve the magnetic attraction force, and with the interposition of the engagement cylinder 8, the contact between the rod 6 and the inner wall surface of the magnet hole 1a is ensured. This was expected to improve the magnetic attraction force by reliably creating a magnetic path.

Furthermore, by interposing the engagement tube 8, the lack of engagement force due only to the magnetic force of the magnet 1 is compensated for by the press-fitting of the rod 6 into the engagement tube 8, and the inclination of the abutting end surface of the rod 6 is compensated for. Even when the magnetic force suddenly decreases due to the elastic engagement tube 8, the engagement state is prevented from being released, and the elastic force of the engagement tube 8 causes the rod 6 to bounce back against the magnetic surface. It is generated and magnetized. This can effectively deal with the application of external force in the direction of lever-like peeling, which was considered the biggest problem with magnetic engagement tools, and it can be used more completely.
This makes it possible to provide a reliable engagement tool.

Furthermore, with the interposition of the engaging tube 8, it has the feature that the feeling of engagement can be reliably recognized, and the lack of retention that often occurs in conventional magnetic engagement tools, ie. This rod 6 was mistakenly thought to be fully engaged due to the magnetic snapping sound.
This was definitely avoided by the action of the person who fired the bullet against the cylinder 8.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the engaging tool according to the present invention;
2 to 12 are cross-sectional views showing other embodiments, and FIG.
This figure is an exploded perspective view of the female engaging member in FIG. 1. In addition, in the figure 1... magnet, 2-3... ferromagnetic plate, 4...
・Case, 5... Ferromagnetic plate, 6-7... Ferromagnetic rod,
8... Engagement tube, 9... Washer, 10... Mounting plate.

Claims (1)

[Claims] 1. An engaging hole 1a extending from one side of the magnetic pole face to the other side of the magnetic pole face.
A ferromagnetic plate 2 is attached to one of the magnetic pole faces of a permanent magnet 1, and a magnetic shielding plate 3 is attached to the other magnetic pole face excluding the hole 1a, and a non-magnetic case 4 is fitted onto the magnet 1. Tepan 2
, 3 and the magnet 1 are integrally fixed together, and the ferromagnetic rod 6 of the ferromagnetic plate 5, which is magnetically attached and removably abutted on the surface of the plate 3, is attached to the plate 2 or on the plate 2. In a configuration in which the ferromagnetic rod 7 is arranged upright, the elastic engagement cylinder 8 is removably fitted into the ferromagnetic rod 6 and is inserted into the magnet hole. A concave portion 1 regulated by the case 4 configured in 1a or the end of the plate 3 and the ferromagnetic plate 2
An engagement tool characterized in that it is loosely fitted into b. 2. The engagement tool according to claim 1, characterized in that a separation groove 8a is provided between the ends of the engagement tube 8. 3. The engagement tool according to claim 1, wherein the head of the rod 6 is an expanded head end 6a.