JPS5949995B2 - Engagement tool - 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 has little magnetic impact.

Therefore, in the conventional engagement tool of this type, the magnet 3
It has been common practice to fit a case over the circumferential surface of the magnet 3 for the purpose of integrally fixing the plate 2 and the like, as well as for the purpose of protecting and decorating the outer circumferential surface of the magnet 3.

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 has been devised especially in view of the disadvantages in the conventional example, and the present invention is a cylindrical case 1 made of a non-magnetic material.
is prepared, and the magnet 3 and the ferromagnetic plate 2 are press-fitted into the case 1, and one end of the case 1 is made to protrude from the fitting magnet 3 as an edge flange Ib,
The assembly of the engaging tool itself is improved, the material cost is reduced, and the occurrence of troubles due to leakage magnetic flux is suppressed as much as possible.

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 a resin material, etc., so that it is possible to easily change the external diameter or color tone to suit the purpose of use of the engagement tool. It could have been created.

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, which has a peripheral flange 1a on the inner side of its lower end, a synthetic resin,
It is made of non-magnetic metal or the like, 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.

Note that this magnet 3 has an engaging hole 3a from one magnetic pole surface to the other magnetic pole surface, and when fitted, the upper edge of the case 1 protrudes upward, and the wall thickness forming the edge flange Ib This is what was said.

Next, reference numeral 4 denotes a ferromagnetic plate which is attached to the magnetic pole face of the magnet 1 surrounded by a rim Ib so as to be able to be adsorbed and removed.
A ferromagnetic rod 5 is erected on the plate 2, and the ferromagnetic rod 6 erected on the plate 2 and the ferromagnetic rod 5 are brought into contact with each other in the hole 3a so as to be able to be adsorbed and removed.

The rods 5 and 6 are both erected with a magnetic gap between them and the inner circumferential wall of the hole 3a, and the adsorption effect is attenuated due to a magnetic short circuit between them and the inner circumferential wall of the hole 3a. In addition, the tip periphery of the rods 5 and 6 is made into a rounded surface, and the contact end surface is made small compared to the rod diameter of the rods 5 and 6, so that the distribution density of magnetic lines of force on the attracting surface is reduced. This is intended to improve the adsorption effect.

As a means of attaching such an engaging tool to the base plate of the bread pack, etc., a mounting washer 7 having folded leg pieces 7a to 7a is caulked to the plates 2 and 4 with the small diameter rod portions of the rods 5 and 6. This is what I did.

In this embodiment, the magnet 3 and the rod 2 are securely fitted by simply press-fitting them into the case 1, eliminating the need for any other attachment means. The outer circumferential surface is completely protected by the relatively thick case 1 and has an attractive external shape.

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

Incidentally, this edge flange 1b reliably prevents the plate 4 from shifting laterally and enables effective maintenance of the engaged state.

Next, in the embodiment shown in FIG. 2, 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 is something.

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, the embodiment shown in FIG.
A ferromagnetic plate 9 for magnetic shielding is interposed between the inside of the magnet 3 and the magnetic pole face of the magnet 3, thereby perfecting the magnetic shielding effect. The interposition of the plate 9 is said to be particularly useful not only for preventing magnetic leakage but also for configuring a magnetic closed circuit with low magnetic resistance connecting the rods 5 and 6, and promises effective adsorption. It is something.

The embodiment shown in FIG. 4 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 FIG. 5, the outer circumferential side of the plate 9 is extended downward to form a shield edge flange 9a, so as to completely block magnetic leakage on the outer circumferential surface of the engaging tool. In addition, in the embodiment shown in FIG.
In addition to reliably preventing magnetic leakage at the periphery, it is also brought close to the rod 6 to concentrate lines of magnetic force on the periphery of the edge flange 9b to ensure effective attraction. In the embodiment shown in FIG. 7, the small diameter rod portion of the rod 6 is used as a bolt 6a to replace the mounting washer 7, and is screwed with a nut 10. In the embodiment shown in FIG. 8, the rod portion is a pin 6b, and the decorative button 11 is
Further, the embodiment shown in FIGS. 9 and 10 has a funnel mounting member 12a which is to be press-fitted to each other, and a bottomed funnel mounting member 12a. In the embodiment shown in FIG. 11, the engaging tool is attached to a bending mounting plate 13 for holding a handbag base plate or the like. Furthermore, the embodiment shown in FIG. 12 has an engaging structure for use in buckles, etc.
The plate 4 is particularly bent, and a hole 14 for attaching a band or the like is opened at the bent end.

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 an embodiment of the engaging tool according to the present invention;
2 to 12 are cross-sectional views showing other embodiments. 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, 10...Nut, 11... ... Decorative button, 1
2...Mounting member, 13...Mounting plate, 1
4... This shows the mounting hole.

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 formed therein is press-fitted in such a way that the opening edge of the case 1 protrudes above the surface of the fitting magnet 3, and then the protruding edge of the case 1 is used as an engaging edge flange 1b, An engagement device characterized in that a ferromagnetic plate 4 that is housed within the engagement edge flange 1b and a ferromagnetic rod 6 that protrudes from the plate 2 are brought into contact and attracted in the hole 3a. .