JPS6118326B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention provides an engaging tool using a permanent magnet, in particular, which minimizes the possibility of magnetic interference and further improves the engagement of the male tool. The present invention relates to the disclosure of an engaging female fitting structure.

(Prior art) Conventional engaging tools using permanent magnets of this kind have generally been designed to effectively draw out the attraction force, and have been designed to prevent accidents caused by magnetism, especially magnetic tapes and magnetic cards. Also, little attention has been paid to the destruction of magnetic recording parts of magnetic tickets and the like.

(Problem to be Solved by the Invention) Some attempts have been made to interpose a magnetic shield plate on the magnetic pole surface in order to prevent such magnetic destruction. The shielding effect was considered to be completely meaningless when the two came into contact with each other.

(Means for Solving the Problems) The present invention has been specially devised in view of the inconveniences of the conventional fasteners, and is designed to ensure that the magnetic tape, magnetic card, or magnetic chip directly contacts the magnetic pole surface. In addition to preventing this, a part of the non-magnetic case 6 is used as it is to constitute a mating edge flange 6a as a guide for the insertion and removal of the male tool and as a rim flange to prevent the male tool from sliding sideways. It is.

That is, the permanent magnet 1 has an engaging hole 1a opened from one magnetic pole surface a toward the other magnetic pole surface b.
The ferromagnetic plate 2 is attached to the magnetic pole face a of the permanent magnet, and the ferromagnetic plate 3 and the ferromagnetic plate 2 are attached to the magnetic pole face b so as to be able to come into contact with each other through the hole 1a of the permanent magnet. In an engagement tool that has ferromagnetic rods 4, 5 protruding from both or one of the plates 2, 3, the two plates 2, 3 are brought into contact with each other in a detachable manner,
A ferromagnetic plate 7 is attached to the magnetic pole face b of the permanent magnet 1, and the permanent magnet 1, the ferromagnetic plate 7, and the ferromagnetic plate 2 are integrally held in a cylindrical nonmagnetic case 6,
Moreover, the inside of the edge flange 6a at the cylindrical end of the case 6 positioned on the peripheral edge of the ferromagnetic plate 7 is
It is configured to have a suction recessed part.

(Example) Hereinafter, details of the fastener according to the present invention will be explained with reference to a typical example shown in FIG. This is a permanent magnet with an engaging hole 1a opened toward the magnet 1, and a ferromagnetic plate 2
In addition, a ferromagnetic plate 7 is attached to the other magnetic pole surface b, and the ferromagnetic plates 2 and 7 and the magnet 1 are fitted into a cylindrical non-magnetic case 6, and installed at the opening edge of the case 6. It is integrated with a locking piece 6c.

Incidentally, the case 6 has a structure along the outer periphery of the ferromagnetic plate 7.
The engaging edge flange 6a is constructed with a thick wall, and there is no problem of dimensional unevenness due to bending of the case 6 in the configuration of the edge flange 6a, and it stands clearly as the engaging edge of the male tool B. The edge flange 6a is configured.

The ferromagnetic rod 4 reaching the upper edge of the opening of the magnet hole 1a is arranged to stand on the inner wall of the hole 1a with a considerable magnetic gap therebetween, and has a bent leg piece 8a with the ferromagnetic plate 2 in between. The small diameter rod part 4a of the ferromagnetic rod 4 is inserted into the mounting washer 8 and crimped.

B is a male tool that includes a ferromagnetic plate 3 and a bent leg piece 9a.
The periphery of the ferromagnetic plate 3 is engaged within the edge collar 6a, and the ferromagnetic plate 3 is engaged with the periphery of the ferromagnetic plate 3 to prevent lateral displacement as a stop. .

In such a structure of the female tool A according to the present invention, when the male tool B is removed, the magnetic path b on the magnetic pole surface is focused on the ferromagnetic plates 2 and 7, and the lines of magnetic force on the ferromagnetic plate 2 are focused on the ferromagnetic rod 4. A passage is formed between the upper edge of the ferromagnetic rod 4 and the inner opening edge of the ferromagnetic plate 7.
Therefore, the lines of magnetic force do not extend beyond the magnetic pole face b at all, and even if a magnetic tape or the like is brought close to the magnetic pole face b, there is no fear of magnetic interference.

Furthermore, due to the presence of the engaging edge flange 6a protruding along the outer periphery of the magnetic pole of the female tool A, some leakage magnetism is expected to occur between the magnetic poles via the outer surface of the magnet 1. Contact with the magnetic tape, etc., can also be avoided, and almost complete magnetic shielding can be guaranteed even when the male tool B is removed.

In the embodiment shown in FIG. 2, the length of the ferromagnetic rod 4 in the female tool A reaches the middle of the hole 1a, and the corresponding male tool B is shown in FIG. 3, the ferromagnetic rod 4 is completely omitted, and the stopper shown in FIG. 11, in which the ferromagnetic plate rod 5 of the male tool B reaches the ferromagnetic plate 2, corresponds to this. It was planned as

Next, the embodiments from FIG. 4 to FIG. 6 are female tool A.
4 shows other installation examples for
The figure shows an example in which a funnel-shaped attachment member 10 is attached to the magnet 1 together with the ferromagnetic plate 2 in the case 6, and FIG. 5 shows an example in which a bottomed funnel-shaped attachment member 11 is similarly attached to the magnet 1. The mounting members (not shown) which are press-fitted through the substrate are shaped like the mounting member 10 shown in FIG. 5 in the female fitting shown in FIG. 4, respectively. In addition, in the embodiment shown in FIG. 6, the small diameter rod portion 4a of the ferromagnetic plate 4 is made into a pin shape, and is pierced and fixed to a washer 12 having a piercing slit via a base plate. 7
In the example shown in the figure, the small diameter rod portion 4a of the ferromagnetic rod 4 is a screw rod, and is fixed to the base plate using a washer 13 and a nut 4.

Furthermore, the embodiment shown in FIG. 8 shows a case where it is used as a snap for a shoe band or other bands, and the ferromagnetic plate 2 is extended laterally and the engagement hole 2a for the band is provided in this part. It is something.

Further, in the embodiment shown in FIG. 9, the attracting surface of the female tool A is provided with a tapered or rounded surface that slopes toward the hole 1a to improve the fit of the ferromagnetic rod 5 of the male tool B. This provides particularly good sliding on slopes.

Next, the examples shown in FIGS. 11 to 13 are various male tools B, and the example in FIG. 12 corresponds to the embodiment in FIG. 8, and the example in FIG. 13 corresponds to the embodiment in FIG. Hole 1a in the example of
This is particularly meaningful as it corresponds to the female tool A in which a ferromagnetic rod 4 extending up to the upper edge of the opening is erected on two surfaces of the ferromagnetic plate.

Furthermore, FIG. 14 shows a male tool B with a design change so that it can engage with the edge flange 6a of the female tool A.

(Effects) With the simple configuration described above, the present invention prevents a magnetic recording card or the like that attempts to come into contact with the magnetic pole surface b from coming into close contact with the magnetic pole surface b using the edge flange 6a, thereby eliminating any possibility of magnetic interference. The present invention also relates to the provision of a female tool A that reliably prevents the male tool B from shifting laterally and reinforces the case itself.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of a pair of fasteners according to the present invention, FIGS. 2 to 9 are sectional views showing other embodiments, and FIGS. 11 to 13 are embodiments of a male fixture. A cross-sectional view showing an example, FIG. 14 is a cross-sectional view showing a pair of fasteners of another embodiment. In addition, in the figure, A...female tool, B...male tool, a, b...magnetic pole surface, 1...permanent magnet, 2-3...ferromagnetic plate, 4-5...
Ferromagnetic rod, 6... Case, 7... Ferromagnetic plate, 8-9...
Mounting washer, 10-11...Mounting member, 12-13...
Washer, 14...Natsu is shown.

Claims (1)

[Scope of Claims] 1. A ferromagnetic plate 2 attached to a magnetic pole surface a of a permanent magnet 1 having an engaging hole 1a opened from one magnetic pole surface a to the other magnetic pole surface b, and a magnetic pole. A ferromagnetic rod 4 or 5 protruding from either or both of the ferromagnetic plate 3 and the ferromagnetic plate 3, which is removably attracted to the surface b, connects with the ferromagnetic rod 4 or 5 through the hole 1a of the permanent magnet 1. A ferromagnetic plate 7, which is an engaging tool that is removably attracted to the ferromagnetic plate 2 or 3 and has a hole communicating with the hole 1a, is attached to the magnetic pole face b of the permanent magnet 1, and has a cylindrical end on one side. The ferromagnetic plate 7 is placed inside a cylindrical non-magnetic case 6 having a circumferential edge flange 6a.
Regarding a, the ferromagnetic plate 2, the permanent magnet 1, and the ferromagnetic plate 7 are integrally fitted, and the surface of the ferromagnetic plate 7 inside the peripheral flange 6a is in the attraction recess of the ferromagnetic plate 3. An engagement tool characterized by: