JPS62115807A - Engagement device - Google Patents

Abstract

PURPOSE:To prevent influence of magnetism on a magnetic recording card, etc. by fixing a fitting member consisting of non-magnetic metal where a couple of legs for bending are protruded in the same direction to the plate formed like a seat plate with the surface of the seat plate closely attached to the rear surface of attracting surface of ferro-magnetic material. CONSTITUTION:The plate part 3b of ferro-magnetic material 3 is attracted by the magnetic pole surface b of female device a through a case 4, and the protruded rod 3a and the protruded rod 2a of ferro-magnetic material 2 are collided and attracted to each other at the end portions thereof within a hole 1a of permanent magnet 1. The line of magnetic force of magnetic pole surfaces a, b is concentrated to the plate parts 2b, 3b of ferro-magnetic materials 2, 3, and this magnetic flux is guided to the protruded rod parts 2a, 3a to form a magnetic circuit, thereby obtaining an effective attracting force. Since the fitting material is formed by non-magnetic metal as explained previously, when it is attached to a bag, etc., the magnetic force of permanent magnet does not leak into the interior of bag with the leg portion of such fitting materials used as the magnetic path.

Description

Detailed Description of the Invention (Industrial Application Field) This invention comprises a metal fitting provided on an engaging tool made of non-magnetic metal in order to attach the engaging tool using a permanent magnet to the fabric of a bag, etc. The present invention relates to an engaging tool that prevents magnetic disturbance to a cash card or the like stored inside a bag or the like due to rε air leakage from a permanent magnet on the front side of the fabric to which the engaging tool is attached.

(Prior art) Conventionally, an engaging tool using a permanent magnet has a washer-like metal mounting member
It sticks to one magnetic pole surface of the J1! The leg piece Y was inserted into the JC, and the fabric C was attached by bending and locking the protruding tip of the leg piece Y onto the fabric C surface.

In this case, since there is no ferromagnetic plate attached to the magnetic pole face of the permanent magnet 1 to focus the magnetic lines of force, the magnetic lines of force come out from the entire surface of the magnetic pole face as shown in Figure 10, and the metal There were few cases where the magnetic attachment member X was used as a path to reach the leg piece Y, and the lines of magnetic force coming from the end of the leg piece Y bent on the back side of the fabric C did not have an adverse effect on the magnetic recording card or the like.

(Problems to be Solved by the Invention) However, recent engagement tools using permanent magnets have a protruding plate portion 2b on one magnetic pole surface a of the permanent magnet l, as shown in FIG. 11, in order to increase the attraction force. A ferromagnetic member 2 having a rod portion 2a 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 is in contact with the other magnetic pole face. A ferromagnetic member 3 having a plate portion 3b and a protruding rod portion 3a protruding from the plate portion 3b is connected to the ferromagnetic member 2.
There is a device in which the protruding rod portions 2a and 3a are used as magnetic paths to attract the rod, and a high adsorption force can be effectively obtained by the magnetism concentrated on the protruding rod portions 2a and 3a. The seat plate-shaped mounting member X, which has a pair of legs Y and Y that is fixed to the magnetic member 2, is made of the same metal as the ferromagnetic member 2 and is a low resistance path, so the magnetism is focused on the ferromagnetic member 2. is inserted through the fabric C of the bag using the mounting member magnetic field lines have a negative effect on

There were problems such as destruction of magnetic recording.

(Means for Solving the Problem) This invention prevents the magnetism of the permanent magnet from exerting a magnetic influence on the inside of the bag by means of a mounting member inserted through the fabric C of the bag in order to attach an engaging tool having a permanent magnet. This was proposed to prevent one magnetic pole face a of the permanent magnet 1.
A ferromagnetic member 2 attached to the other magnetic pole face and a ferromagnetic member 3 abutting the other magnetic pole face attract each other at a part thereof, and the engagement tool includes a pair of bending legs. A mounting member 5 made of a non-magnetic metal and having a seat plate-shaped plate portion 5a protruding in the same direction as the mounting member 5 is fixed with the surface of the plate portion 5a in close contact with the back surface of the attracting surface of the ferromagnetic member 2. It is structured as follows.

(Function) As described below, since the mounting member is made of non-magnetic metal, the ferromagnetic member 2 is attached to the magnetic pole face a of the permanent magnet 1 in order to increase the attraction force of the engaging tool. Even if the bag is made to focus, the magnetism will not reach the inside of the bag via the legs 5b of the mounting member 5, as shown in FIG. not be affected by.

For example, in an engagement tool using a permanent magnet l having a magnetic flux of 1000 Gauss, and when the mounting member 5 is made of iron, the magnetic flux at the tip of the leg 5b is about 320 Gauss.
When the leg portion 5b is made of brass, which is a non-magnetic material,
The flux number at the tip is reduced to about 70 Gauss. Therefore 200
Even magnetic subway tickets, whose magnetic records can be destroyed by Gauss, are absolutely safe.

(Embodiment) Fig. 1 shows a typical embodiment of the present invention, in which l is a permanent magnet with a top plate shape, and a hole 1a is provided extending from one magnetic pole surface a to the other magnetic pole surface. On the magnetic pole surface a, 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 projecting into the hole la is attached to the magnetic pole surface a. The locking claws 4b provided at the opening of the case 4 are attached to a ferromagnetic member and housed in a dish-shaped non-magnetic metal case 4 which has a hole 4a communicating with the hole 1a on the bottom surface. ? A female tool A is constructed by folding the permanent magnet l and the ferromagnetic member 2 over the surface of the plate portion 2b.

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 female fitting A can be attached to the fabric C by inserting the five leg parts 5b, 5b into the fabric C of a bag, etc., and folding the end protruding from the back side onto the surface. ing.

Reference numeral B denotes a male tool which is attracted and engaged with the female JL A, and is made up of a ferromagnetic member 3 having a protruding rod part 3a protruding from a plate part 3b that is integrated with the mounting member 6. The mounting member 5 of the weaning A is integrally caulked like the ferromagnetic member 2, and the plate portion 3b of the ferromagnetic member 3 is attracted to the magnetic pole face of the female tool A via the case 4. , protruding rod parts 3a and 1
The protruding rod portions 2a of the ferromagnetic member 2 are configured so that their tip surfaces contact and attract each other within the hole la of the permanent magnet 1, and the lines of magnetic force on the magnetic pole faces a and b are connected to the ferromagnetic member. 2.3
The plate parts 2b and 3b of the
, 3a to form a magnetic circuit by inducing this magnetic flux to obtain an effective attraction force.

3 to 5 show other embodiments of the engaging tool 17 and 3.
In the figure, the ferromagnetic member 2 has only the plate part 2b, and the length is set so that the protruding rod part 3a of the ferromagnetic member 3 is directly attracted to the plate part 2b. Ferromagnetic members 3 and 2 are configured, and a case 4 is formed on the peripheral edge of the plate portion 3b when engaged.
A protruding edge 3C that engages with the outer circumferential surface of the suction surface is provided to prevent displacement even when a force parallel to the suction surface is applied. In FIG. 5, the permanent magnet 1 does not have a hole La, and the ferromagnetic member 3 of the male tool B has one end 3d of the plate portion 3b bent at 90 degrees, and is inserted through the hole 4a of the case 4. Permanent magnet 1
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 the direction of movement is applied to the attraction surface as shown by the arrow, the side surface of the permanent magnet 1 is strongly The end portion 3d of the magnetic member 3 is engaged to prevent displacement.

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 7 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. 7, the peripheral edge of the case 4 on the side facing the magnetic pole is further raised to form a protruding edge 4C to form a recessed part 8, and the male tool B is attracted into the recessed part 8. When engaged, the protruding edge 4C prevents a magnetic recording card such as a cash card, or a tape, etc., from coming into close contact with the case 4, thereby completely eliminating destruction of the magnetic recording. In Fig. 8, the case 4 has a short cylindrical shape, and the ferromagnetic part [second and plate part 5a are attached to the magnetic pole face a of the permanent magnet 1 housed in the case 4 with the same diameter as the permanent magnet l]. A magnetic shield plate 7 is attached to the magnetic pole face of the member 5, and locking claws 4b and 4d provided at the opening edge of the case 4 are attached to the plate portion 5a of the mounting member 5 and the surface of the magnetic shield plate 7, respectively. The magnetic shield plate 7, permanent magnet 1, ferromagnetic member 2, and mounting member 5 are held together by folding back. This embodiment is an example in which the protruding rod 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 +a′A
The shield plate 7 and the ferromagnetic member 2 are integrally molded with the permanent magnet 1. When the engagement member is attached to a bag, etc. by the attachment member, the magnetism of the permanent magnet leaks into the bag by passing through the fabric and using the legs of the attachment member folded back on the back side, which become the inside of the bag, as a magnetic path. 1. There is no magnetic recording of cash cards, 93 marks, telephone cards, etc. stored inside the car. Alternatively, it is safe as there is no risk of destroying magnetic recording tapes such as cassette tapes or other magnetic recording.

4 drawings 11i? I'i Explanation Fig. 1 is a sectional view of a typical embodiment of the invention, Fig. 2 is an explanatory drawing showing the state of the lines of magnetic force in a cross section, and Figs. 3 to 5
The figure is a cross section (2) of various other embodiments of the engagement tool, FIGS. 6 to 9 are sectional views showing only the female fittings of various other embodiments of the engagement tool, and FIG. 10: tT, FIG. 11 is an explanatory diagram showing the state of magnetic lines of force in a conventional example.

A... Female fitting, B... Male JJ, l... iy, permanent magnet, 2, 3... ferromagnetic member, 4... case, 5.6.
...Mounting member, 5a, 6a...Plate part, 5b, 6b...
·leg.

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 a non-magnetic metal in which a pair of bending legs 5b are made to protrude in the same direction from a seat plate-like plate part 5a is attached to the plate part 5.
An engagement tool characterized in that the surface a of the ferromagnetic member 2 is tightly fixed to the back surface of the attracting surface of the ferromagnetic member 2.