JPS6310565B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the disclosure of an engagement tool using a permanent magnet that is easy to assemble and causes less magnetic interference.

Therefore, in the conventional engagement tool of this type, the magnet 3 was used for the purpose of integrally fixing the magnet 3 and the plate 2, etc., as well as for the purpose of protecting and decorating the outer peripheral surface of the magnet 3. It was common to fit a case around the circumference.

However, in this method of fitting the case over the entire circumferential surface of the magnet 3 except for the two contact plates, the cost of the case member is relatively high, and the magnetic leakage from the magnet 3 Failures are also often induced.

Moreover, in such a method, there is little change in the exterior surface, the decorative function is inferior, and furthermore, it is completely defenseless against horizontal displacement of the plate 4.

The present invention was specially devised in view of the inconveniences in the prior art, and a cylindrical case 1 made of a non-magnetic material is prepared, and a magnet 3 and a ferromagnetic plate 2 are placed inside this case 1. is press-fitted, and one end of the case 1 is configured as an edge flange 1b to protrude from the fitting magnet 3, thereby improving the assemblability of the engaging tool itself and reducing the material cost. At the same time, the occurrence of troubles due to leakage magnetic flux can be suppressed to the utmost.

In addition, the case 1 of the present invention is not subject to any restrictions in terms of material, and is expected to be made of resin material, etc., so that it is possible to easily create an external shape or color appearance that matches the purpose of use of the engagement tool. It was something I could have done.

The details of the present invention will be described below with reference to a typical embodiment shown in the drawings. Reference numeral 1 is a cylindrical case made of a non-magnetic material, and a peripheral flange 1a is provided inside the lower end of the case.
It is made of synthetic resin, non-magnetic metal, etc., and has a wall thickness that can withstand press-fitting of the magnet 3 and the like later.

Next, a ferromagnetic plate 2 is fitted into the case 1 so as to engage the edge flange 1a, and a magnet 3 is further press-fitted onto the surface of the plate 2.

This magnet 3 has an engaging hole 3a from one magnetic pole surface to the other magnetic pole surface, and when fitted, the retaining edge of the case 1 protrudes upward, and the thickness of the edge flange 1b increases. This is what was said.

Next, 4 is a ferromagnetic plate which is attached to the magnetic pole face of the magnet 1 surrounded by the edge flange 1b in a detachable manner. In the case where the ferromagnetic rod 6 erected on the plate 2 is brought into contact with the hole 3a through the hole 3a, the ferromagnetic rod 6 is attached to the hole 3a.
A case is planned in which the plate 4 is brought into contact with the plate 4 through the a, so that it can be adsorbed and detached.

The rods 5 and 6 are both erected with a magnetic gap between them and the inner circumferential wall surface of the hole 3a.
This is to prevent the attenuation of the adsorption effect due to a magnetic short circuit between the rods 5 and the inner circumferential wall surface of the rods, and the tip periphery of the rods 5 and 6 is rounded, and the diameter of the rods 5 and 6 is smaller than that of the rods. The number of contact end faces is reduced to further increase the distribution density of magnetic lines of force on the attracting surface, thereby improving the attracting effect.

As a means for attaching such an engaging tool to a base plate of a handbag, etc., bent leg pieces 7a to 7 are attached to plates 2 and 4.
The mounting washer 7 having the shape a is caulked by holding the small diameter rod portions of the rods 5 and 6.

Note that the legs 7a to 7a are planned to be attached to the plates 2 and 4 that do not have the rod 5 or the rod 6 by a separate method such as welding.

In such an embodiment, the magnet 3 and the plate 2 are securely fitted by simply press-fitting them into the case 1, eliminating the need for any other attachment means, and the outer periphery of the magnet 3 The surface is completely protected by the relatively thick case 1, and the exterior shape is rich in taste.

Furthermore, even if a magnetic tape or a magnetic card is brought close to the magnetic pole surface with the intervention of the edge 1b, direct contact with the pole surface can be avoided, and magnetic recording on this tape, etc. can be prevented. Destruction was effectively prevented.

The edge flange 1b reliably prevents the plates 4 from shifting laterally, as can be seen especially in the embodiment shown in FIG. 2, and makes it possible to effectively maintain the engaged state.

Next, in the embodiment shown in FIGS. 3 and 4, the magnet 1 and plate 2 are covered in advance with a non-magnetic case 8 in order to more effectively achieve the various characteristics described above. It was designed to do so. The case 8 is designed to have a cylindrical shape, with a hole formed so as to be folded into the hole 3a, and a bent locking piece 8a on the edge of the opening.

Furthermore, in the embodiment shown in FIGS. 5 and 6, a ferromagnetic plate 9 for magnetic shielding is interposed between the inside of the case 8 and the magnetic pole face of the magnet 3,
This completes the magnetic shielding effect.

The interposition of plate 9 was said to be particularly useful not only for preventing magnetic leakage, but also for configuring a magnetic closed circuit with the lowest magnetic resistance connecting rods 5 and 6, and guaranteed effective adsorption. It is something.

The embodiment shown in FIGS. 7 and 8 shows a modification of the mounting of the plate 9, and the upper surface of the case 8 is omitted.

Furthermore, in the embodiment shown in FIGS. 9 and 10, the outer circumferential side of the plate 9 is extended downward, and a shield edge flange 9a is used to completely prevent magnetic leakage on the outer circumferential surface of the engaging tool. In the embodiment shown in FIGS. 11 and 12, an edge collar 9b of the plate 9 is further extended downwardly from the inner circumferential side of the hole 3a, and the periphery of the hole 3a is In addition to reliably preventing magnetic leakage at the edge 9b, the magnetic force lines are brought close to the rod 6 to concentrate lines of magnetic force around the periphery of the edge flange 9b to ensure effective adsorption.

It should be noted that many other embodiments are planned in addition to the embodiments described above, and only typical examples have been exemplified, especially regarding the mounting structure of the engagement tool. .

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the engaging tool according to the present invention, and FIGS. 2 to 12 are sectional views showing other embodiments. In addition, in the figure 1... case, 2... ferromagnetic plate, 3...
...Permanent magnet, 4...Ferromagnetic plate, 5-6...Ferromagnetic rod, 7...Mounting washer, 8...Case, 9...Ferromagnetic plate.

Claims (1)

[Claims] 1. Fit the ferromagnetic plate 2 into a cylindrical non-magnetic case 1 having an inner peripheral flange 1a at one open end so as to engage the flange 1a, and then move the ferromagnetic plate 2 from one magnetic pole surface toward the other magnetic pole surface for engagement. A permanent magnet 3 having a hole 3a is press-fitted into the case 1 so that the opening edge of the case 1 protrudes above the surface of the fitting magnet 3, and then the case 1 is
The protruding edge of the engaging edge flange 1b is defined as the engaging edge flange 1b.
A ferromagnetic rod 5 or a ferromagnetic rod 6 protruding from either one of the ferromagnetic plate 4 and the plate 2 is placed in contact with the plate 2 or 4 in the hole 3a. An engagement tool characterized by adhesion.