JPS62128104A - Engaging device - Google Patents

Abstract

PURPOSE:To enable magnetic leakage at a projecting end part to be completely shielded, by forming a mounting member of non-magnetic metal so that magnetic lines of force of a permanent magnet never almost leak inside a pouch. CONSTITUTION:As for a mounting member 5 made of non-magnetic metal in a female tool A, a pair of bending legs 5b and 5b are arranged projecting in the same directions on a washer-shaped plate part 5a, and a small diameter part of the said projecting part 2a is caulked at the center of the plate part 5a. And, the legs 5b and 5b are passed in a cloth C of a pouch or the like. A ferromagnetic washer 7 made of iron or the like is first passed in the projecting-end part 5b' which is projecting on the back plane, followed by a non-magnetic washer 8 made of plastics or the like. The projecting end part is folded back on a plane of the non-magnetic washer 8 to mount the female tool A in the cloth C. Also in a male tool B6, which is absorbed/fitted to the female tool A, a fitting member 6 and a ferromagnetic member 3 are caulked unitedly in the same way as in the female tool A. In case they are fitted to form a magnetic closed circuit, the number of magnetic flux becomes zero at the projecting-end part 5b' of the leg part 5b, and in case of no fitting, complete magnetic shielding can be realized at the projecting-end part 5b.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention utilizes a metal fitting provided on the engaging tool and a washer attached to the engaging tool to attach the engaging tool using a permanent magnet to fabric such as a bag. This invention relates to an engaging tool which prevents magnetic interference from occurring on cash cards, etc. stored inside bags, etc. due to magnetic leakage from permanent magnets on the back side of the cloth to which the engaging tool is attached.

(Prior art) A conventional engaging tool using a permanent magnet is a ferromagnetic one that has a plate part 2b and a protruding rod part 2a on one magnetic pole surface a of a permanent magnet 1, as shown in FIG. 10, in order to increase the attraction force. The member 2 is attached on the surface of the plate portion 2b, and the plate portion 2 serves as a magnetic path on the magnetic pole face a to focus the magnetism, and the plate portion 3b which is in contact with the other magnetic pole face Projected protruding rod portion 3a
The ferromagnetic member 3 having the above-mentioned ferromagnetic member 2 attracts the ferromagnetic member 2 and its protruding rod portions 2a, 3a as magnetic paths, and a high attraction force is effectively obtained by the magnetism that concentrates and passes through the protruding rod portions 2a, 3a. In this, the seat plate-shaped mounting member X having a pair of legs Y, Y fixed to the ferromagnetic member 2 is made of the same metal as the ferromagnetic member 2,
Since it is a low-resistance path, the magnetism focused on the ferromagnetic member 2 passes through the fabric C of the bag using the mounting member There was a problem in that the magnetic field lines of type 1 affected the stored magnetic recording cards such as cash cards or magnetic tapes, destroying the magnetic recording.

(Problem to be Solved by the Invention) Therefore, in order to solve this problem, the mounting member A system was proposed that would prevent leakage, but it was difficult to completely shield the magnetic field.

(Means for Solving the Problems) This invention uses a mounting member inserted through the fabric C of the bag to attach an engaging tool having a permanent magnet, so that the magnetism of the permanent magnet exerts a magnetic influence on the inside of the bag. This was proposed in order to completely prevent this, and the ferromagnetic member 2 attached to one magnetic pole face a of the permanent magnet 1 and the ferromagnetic member 3 abutted to the other magnetic pole face It is an engagement tool that is configured to attract each other with a portion thereof, and includes a pair of bending leg portions 5b.
A mounting member 5 made of a non-magnetic metal that protrudes in the same direction as a seat plate-like plate portion 5a is fixed so that the surface of the plate portion 5a is closely attached to the back surface of the attracting surface of the ferromagnetic member 2. The protruding end portion 5b of the leg portion 5b is inserted through the attachment fabric of a bag or the like.
A ferromagnetic washer 7 and a non-magnetic washer 8 are inserted into the protruding end 5b' with the ferromagnetic washer 7 facing the mounting surface.
is bent on the surface of the non-magnetic washer 8.

(Function) In the case of a conventional engagement tool using an iron mounting member, for example, if the magnetic flux of the permanent magnet 1 is 1000 Gauss, the leg portion 5b will protrude when not engaged, that is, when the magnetic circuit is released. The number of magnetic fluxes at the end portions 5b' is 400 Gauss, and when this is engaged, that is, when a magnetic closed circuit is formed, the majority of the magnetic lines of force in the leg portions 5b are focused in the closed circuit, and the number decreases to 160 Gauss. Therefore, if the mounting member 5 is made of non-magnetic metal as described above, the number of magnetic flux at the protruding end portion 5b' of the leg portion 5b will be O, and the attraction force will increase by 180 Gauss. Therefore, if the attachment member on the suction side of the engagement tool is configured in the same manner, the suction force on the suction side will be increased by a total of 320 Gauss.

In addition, since the mounting member 5 is made of a non-magnetic metal, when the mounting member 5 is not engaged, unlike when it is engaged, the lines of magnetic force are less concentrated in a closed circuit, so the leg portion 5
Although there is a magnetic field line leakage of 75 Gauss at the protruding end 5b' of b, it is completely shielded by the ferromagnetic washer 7 and the non-magnetic washer 8, and becomes O.

(Embodiment) Fig. 1 shows a typical embodiment of the present invention, in which reference numeral 1 denotes a permanent magnet in the form of an annular plate, with a hole 1a extending from one magnetic pole surface a to the other magnetic pole surface. A ferromagnetic member 2 consisting of a disk-shaped plate portion 2b having the same diameter as the permanent magnet 1 and a protruding rod portion 2a protruding into the hole la is attached to the magnetic pole surface a. It is housed in a dish-shaped non-magnetic metal case 4 with a hole 4a in the bottom that communicates with the hole 1a. A female tool A is constructed by folding back onto the surface of the plate portion 2b of the member 2 and integrally holding the permanent magnet l and the ferromagnetic member 2.

Further, the protruding rod portion 2a of the ferromagnetic member 2 is caulked to the plate portion 2b by a narrow diameter portion extending therefrom, and at the same time, a mounting member 5 made of a non-magnetic metal is caulked.

That is, the mounting member 5 has a seat plate-like plate part 5a with a pair of bending legs 5b, 5b protruding in the same direction, and the thin protruding rod part 2a is placed in the center of the plate part 5a. The diameter part is caulked, and the legs 5b, 5b are inserted into the fabric C of a bag, etc., and a ferromagnetic washer 7 made of iron or the like is first inserted into the protruding end 5b' which protrudes from the back side, and then a ferromagnetic washer 7 made of iron or the like is inserted into the protruding end 5b' that protrudes from the back side. , a non-magnetic washer 8 made of plastic or the like is inserted, and a protruding end 5b' is formed on the surface of the non-magnetic washer 8.
The female fitting A is attached to the fabric C by folding it back.

Reference numeral B denotes a male tool which is engaged with the female tool A by attraction, and is a mounting member 6.
The mounting member 6 consists of a ferromagnetic member 3 having a protruding ring portion 3a protruding from a plate portion 3b integrated with the female fitting A.
The mounting member 5 and the ferromagnetic member 2 are integrally caulked, and the plate portion 3b of the ferromagnetic member 3 is attracted to the magnetic pole face of the female fitting A via the case 4, and the protruding ring portion 3a and the protruding ring part 2a of the ferromagnetic member 2 are configured so that their tip surfaces contact and attract each other in the hole la of the permanent magnet 1, and the lines of magnetic force on the magnetic pole faces a and b are strongly The magnetic members 2.3 are collected on the plate portions 2b, 3b, and the protruding ring portions 2a, 3
This magnetic flux is induced in a to form a magnetic circuit so that an effective attracting force can be obtained.

Figures 3 to 5 show other embodiments of the engagement tool, and in Figure 3, the ferromagnetic member 2 is only the plate part 2b, and the protruding ring part 3a of the ferromagnetic member 3 is directly attracted to the plate part 2b. In contrast, in Figure 4, the length of the ferromagnetic member 3 is set to
and 2, and a case 4 is formed on the periphery of the plate portion 3b when engaged.
A protrusion 3C that engages with the outer circumferential surface of is provided.

It is designed to prevent displacement even if a force parallel to the suction surface is applied. In FIG. 5, the permanent magnet l does not have a hole 1a, and the ferromagnetic member 3 of the male tool B has one end 3d of the plate portion 3b bent by 80 degrees, and the ferromagnetic member 3 is inserted through the hole 4a of the case 4. The tip of the end portion 3d is attracted to the plate-shaped ferromagnetic member 2 of the female tool A on the side of the permanent magnet 1, and even if a force in a direction parallel to the attraction surface as shown by the arrow is applied, the side surface of the permanent magnet 1 The end portion 3d of the ferromagnetic member 3 is engaged with the ferromagnetic member 3 to prevent it from slipping.

Figures 6 to 9 show female fittings of other engaging tools, and Figure 6 shows the magnetic pole face and case 4 of the female fitting as shown in Figure 1.
A ferromagnetic magnetic shield plate 9 is interposed between the magnetic pole faces to prevent magnetic leakage from the magnetic pole face, thereby preventing an adverse effect on the magnetic recording article approaching the magnetic pole face when the male tool B is not attracted. In FIG. 7, the peripheral edge of the case 4 on the side facing the magnetic pole is further raised to form a protrusion 4C to form a recessed part 10,
The male tool B is attracted and engaged in the recessed part 10, and the projecting edge 4c
This prevents magnetic recording cards such as cash cards, tapes, etc. from coming into close contact with the four surfaces of the case, completely eliminating destruction of the magnetic recording.

In Fig. 8, the case 4 is of a short cylindrical shape, and the case 4 is
A mounting member 5 having a ferromagnetic member 2 and a plate portion 5a having the same diameter as the permanent magnet 1 is attached to the magnetic pole face a of the permanent magnet l housed inside, and
A magnetic shield plate 9 is attached to the magnetic pole face, and the engaging IE claws 4b and 4d provided at the opening edge of the case 4 are attached to the plate portion 5 of the mounting member 5, respectively.
A, the magnetic shield plate 9, permanent magnet 1, ferromagnetic member 2, and mounting member 5 are integrally held by folding back onto the surface of the magnetic shield plate 9.

This embodiment is an example in which the protruding ring portion 2a and the plate portion 2b of the ferromagnetic member 2 are integrally formed, and the ferromagnetic member 2 is attached to the ferromagnetic member 2 as in each of the above-mentioned embodiments. When caulked, the plate portion 5a of the mounting member 5 has a small diameter, so the locking pawl 4b is folded back onto the surface of the plate portion 2b of the ferromagnetic member 2. In FIG. 9, the permanent magnet 1 is made of synthetic resin containing hard magnetic powder, and the magnetic shield plate 9 and the ferromagnetic member 2 are integrally molded with the permanent magnet 1.

(Effects) This invention is constructed as described above, and in particular, since the attachment member is made of non-magnetic metal, when the engagement member is attached to a bag etc. by the attachment member, it can be inserted through the fabric and attached to the back surface which becomes the inside of the bag. By using the folded legs of the mounting member as a magnetic path, the lines of magnetic force of the permanent magnet hardly leak into the inside of the bag, and
A ferromagnetic washer and a non-magnetic washer are inserted into the protruding end of the leg that is inserted into the mounting fabric of a bag, etc., with the ferromagnetic washer facing the mounting fabric surface. Magnetic leakage is completely shielded not only from the back side of the fabric when it is not engaged, but also from the protruding ends, making it perfect for magnetic recording cards such as cash cards, tickets, telephone cards, etc. stored inside bags, or magnetic recording such as cassette tapes. It is safe and has no risk of destroying magnetic recording on tapes or other materials, and the lines of magnetic force that are prevented from leaking are focused in the magnetic closed circuit of the engaging tool to increase the attraction force, so the attraction is strong and the engagement is ensured. do.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a typical embodiment of the present invention, FIG. 2 is an explanatory diagram showing the state of the magnetic lines of force in cross section, and FIGS.
The figures are cross-sectional views of various other embodiments of the engagement tool, Figures 6 to 9.
The figure is a sectional view showing only the female member of various other embodiments of the engaging member, and FIG. 10 is an explanatory diagram showing the state of the lines of magnetic force in the conventional example. A... Female tool, B... Male tool, 1... Permanent magnet, 2.
3... Ferromagnetic member, 4... Case, 5.6... Mounting member, 5a, 6a... Plate portion, 5b, 6 b...
Leg portion, 7... ferromagnetic washer, 8... non-magnetic washer. Part 5 @ Fig. 7 Fig. 8 Fig. q
Figure IQ diagram

Claims (1)

[Claims] A ferromagnetic member 2 attached to one magnetic pole surface a of a permanent magnet 1 and a ferromagnetic member 3 abutted to the other magnetic pole surface b are attracted to each other at a portion thereof. In this engagement tool, a mounting member 5 made of non-magnetic metal with a pair of bending legs 5b protruding in the same direction of a seat plate-like plate part 5a is attached to the plate part 5.
A ferromagnetic washer 7 and a non-magnetic washer are attached to the protruding end portion 5b' of the leg portion 5b, whose surface a is closely fixed to the back surface of the suction surface of the ferromagnetic member 2, and which is inserted through the mounting fabric of a bag or the like. 8 is inserted with the ferromagnetic washer 7 facing the mounting surface, and the protruding end portion 5b' is bent onto the surface of the non-magnetic washer 8.