JPS6111452B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention provides an engaging tool using a permanent magnet, in particular, which minimizes the possibility of magnetic interference, has a strong attracting force, and has a male tool. This invention relates to the disclosure of an engagement tool that prevents lateral displacement.

(Prior art) Conventional engagement tools using this type of permanent magnet have generally focused on effectively drawing out the attraction force, and have been designed to prevent accidents caused by generated magnetism, especially magnetic tape. However, little attention has been paid to the destruction of magnetic recording parts such as magnetic cards or magnetic tickets.

(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 shield effect was considered to be completely meaningless when there was contact between the two.

(Means for Solving the Problems) The present invention has been specially devised in view of the inconveniences of the conventional fasteners, and includes a magnetic shield plate attached to the magnetic pole surface, and a magnetic tape attached to the magnetic pole surface.
This structure reliably prevents direct contact with magnetic cards or magnetic chips, and also effectively forms a circuit of magnetic lines of force, eliminates magnetic leakage, and provides strong adsorption force.

That is, the ferromagnetic plate 2 provided on the magnetic pole surface a of the permanent magnet 1, which has an engaging hole 1a extending from one magnetic pole surface a to the other magnetic pole surface b, contacts and attracts the magnetic pole surface b. Each of the ferromagnetic rods 4 and 5 protruding from both the magnetic plate 3 is an engaging tool that is removably attracted in the hole 1a, and the hole communicating with the hole 1a of the permanent magnet 1 is an engaging tool. and a ferromagnetic plate 7 having a short cylindrical portion 7a rising from the edge of the hole,
The cylindrical portion 7a is brought into contact with the hole 1a of the permanent magnet 1, and 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 connected to one another. The ferromagnetic plate 7 is placed inside a cylindrical non-magnetic case 6 having a peripheral flange 6a inside the cylinder end.
a, and are integrally fitted, and a magnetic short-circuit prevention gap 10 is provided between the non-magnetic case 6 and the outer circumferential surface C of the permanent magnet 1. The surface of the ferromagnetic plate 7 is made to be the suction recess of the ferromagnetic plate 3.

(Example) Hereinafter, a typical example will be described in which the details of the engaging tool according to the present invention are shown in the drawings. A permanent magnet with an engaging hole 1a opened toward the hole 1a, and a ferromagnetic plate 2 on the magnetic pole surface a of the permanent magnet 1, and a hole edge of the hole communicating with the hole 1a on the other magnetic pole surface b. A ferromagnetic plate 7 with a short cylindrical part 7a is attached by engaging the short cylindrical part 7a to the inner surface of the hole 1a of the permanent magnet 1, and the ferromagnetic plate 2 and the ferromagnetic plate 7 are The permanent magnet 1 is integrally gripped by a cylindrical non-magnetic case 6, and a peripheral flange 6a formed by bending the cylindrical end of the case 6 is provided on the periphery of the ferromagnetic plate 7. The surface of the ferromagnetic plate 7 surrounded by the ferromagnetic plate 6a serves as an attraction recess for the ferromagnetic plate 3, and the outer peripheral surface C of the case 6 and the permanent magnet 1
A short circuit prevention gap 10 is provided between the two.

In the female engaging member A having such a structure, the ferromagnetic rod 4 is erected on the ferromagnetic plate 2 in the hole 1a of the permanent magnet 1 with a considerable magnetic gap between it and the inner wall of the hole 1a. The small-diameter rod part 4a of the ferromagnetic rod 4 is inserted through a mounting washer 8 having a bent leg piece 8a attached via a ferromagnetic plate 2 and caulked.

B shows a male engaging tool with a ferromagnetic rod 5 in the center of its surface.
It consists of a ferromagnetic plate 3 with a protruding surface and a mounting washer 9 having a bent leg piece 9a attached to the back side of the protruding surface of the rod 5, so that the rod 5 is engaged in the hole 1a of the permanent magnet 1. The ferromagnetic rod 4 of the mating tool A and the ferromagnetic plate 3 are attracted to the ferromagnetic plate 7 surface, and the peripheral edge of the ferromagnetic plate 3 is engaged with the peripheral collar 6a to prevent lateral displacement as a stopper. It has been prevented.

In the structure of the female engaging member A of the present invention, when the male engaging member B is attached and removed, the magnetic path 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 The magnetic rod 4 is used as a passage, and the passage is formed between the upper edge of the rod 4 and the inner opening edge of the ferromagnetic plate 7. Therefore, no lines of magnetic force protrude outward from the pole face b, and even if a magnetic tape or the like is brought close to the pole face b, there is no risk of magnetic interference.

In addition, by providing the gap 10 on the outer circumferential surface of the female engagement tool A, even if a magnetic tape or the like comes into contact with the outer surface of the case 6 of the female engagement tool A, the gap 10 will not interfere with the presence of the gap 10. There is therefore no possibility of magnetic disturbances to the contact tape.

The embodiment in FIG. 2 is case 6 in FIG.
This is a change in the structure of the above, in which the circumferential edge flange 6a is not bent, and a portion corresponding to the circumferential edge flange 6a is made thicker. With such a configuration of the peripheral flange 6a, there is no problem of dimensional unevenness due to bending of the case 6, and there is an advantage that the peripheral flange 6a stands up clearly as the engagement edge of the engagement tool.

Next, the embodiments from FIG. 3 to FIG. 6 show other mounting examples for the female engaging member A, and FIG. 3 shows a funnel-shaped mounting example. , Fig. 3 shows an example in which a funnel-shaped mounting member 11 is attached to a permanent magnet 1 together with a ferromagnetic plate 2 in a case 6, and Fig. 4 shows a case in which a funnel-shaped mounting member 12 is attached to a permanent magnet 1 in a case 6.
Similarly, the attachment member (not shown) which is press-fitted through the fabric of the bag or the like is the same as the one used in FIG. 4 for the female engaging member A in FIG. 3. Mounting member 1 shaped like a bottom funnel
2, and the female engaging member A in FIG. 4 uses a shape similar to the funnel-shaped attachment member 11 used in FIG. 3.

Further, in the embodiment shown in FIG. 5, the narrow diameter rod portion 4a of the ferromagnetic rod 4 is formed into a pin shape, and is fixed by piercing it into a washer 13 having a piercing crack through handbag fabric, etc. In the case shown in FIG. 6, the small diameter rod portion 4a of the ferromagnetic rod 4 is a screw rod, and is fixed to a handbag material or the like using a washer 14 and a nut 15.

Further, the embodiment shown in FIG. 7 is used as a snap for a shoe band or other bands, and the ferromagnetic plate 2 is laterally extended and the engagement hole 2a of the band is formed in the extending plate part. It was established in

Further, in the embodiment shown in FIG. 8, a tapered or rounded surface that slopes toward the hole 1a is provided on the surface on which the male engaging tool B is attracted, to improve the fitability of the ferromagnetic rod 5 and to improve the fit of the ferromagnetic rod 5. It has particularly good matteki riding. Figure 9 shows the edge flange 6 of the female engaging tool A.
The male engaging tool B has a design change in order to engage with the male engaging tool B.

(Effects) The present invention has the simple configuration described above, eliminates magnetic leakage from the magnetic pole face b, prevents this magnetic pole face b from having an adverse effect on magnetic recording cards, etc. that come close to it,
In addition, it prevents a magnetic recording card or the like from coming into close contact with the surface, thereby eliminating any destruction of the magnetic recording, and the circuit of magnetic lines of force connects the tips of the holes 7a of the ferromagnetic plate 7 and the ferromagnetic rods 4, 5. As a result of the structure consisting of the ferromagnetic plate 2, rod 4, and ferromagnetic plate 7, there is no magnetic leakage.
Also, there is a gap 1 between the case 6 and the outer peripheral surface C of the permanent magnet 1.
0, which eliminates magnetic short circuits, provides the engaging tool of the present invention with stronger adsorption force and effective magnetic shielding.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the engagement tool according to the present invention, FIGS. 2 to 8 are sectional views showing other embodiments of the female fitting, and FIG. 9 is a sectional view showing another embodiment of the engagement tool. FIG. In addition, in the figure, 1... permanent magnet, 2, 3... ferromagnetic plate,
4, 5... Ferromagnetic rod, 6... Case, 7... Ferromagnetic plate,
8, 9... Mounting washer, 10... Gap, 11, 12... Mounting member, 13, 14... Washer, 15... Nut, a,
b...Magnetic pole surface.

Claims (1)

[Scope of Claims] 1. A ferromagnetic plate 2 provided on the magnetic pole surface a of a permanent magnet 1 having an engaging hole 1a extending from one magnetic pole surface a to the other magnetic pole surface b and a magnetic plate corresponding to the magnetic pole surface b. The ferromagnetic rods 4 and 5 protruding from both the ferromagnetic plate 3 and the ferromagnetic plate 3 to be attracted and attached are engaging tools that are detachably attracted in the hole 1a, and the hole 1a of the permanent magnet 1 A ferromagnetic plate 7 has a hole communicating with the hole 1 and a short cylindrical portion 7a rising from the edge of the hole.
a, and 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 have a peripheral flange 6a on the inside of one cylinder end. The ferromagnetic plate 7 is fitted into the non-magnetic case 6 in the shape of a non-magnetic case 6 by engaging with the peripheral flange 6a, and a magnetic short-circuit prevention gap is created between the non-magnetic case 6 and the outer circumferential surface C of the permanent magnet 1. 10, and the surface of the ferromagnetic plate 7 surrounded by the peripheral flange 6a is used as an attraction concave portion of the ferromagnetic plate 3.