JPS5910203A - Engagement device - Google Patents

Abstract

PURPOSE:To improve the magnetic attracting force between engagement units, provide sufficient protection for edge of magnet and realize integrated fixing of ferro-magnetic plate or fitting metal by abutting a ferromagnetic plate which is removably attracted with magnetic force and the ferromagnetic plate through a hole at the exposed surface of magnet. CONSTITUTION:A hole 1a for engagement is opened toward the other pole surface from the one pole surface of a permanent magnet 1. 2 is a ferromagnetic plate to be mounted and fixed to the one pole surface of the magnet 1 and is integrated to the magnet 1 with a case 4. The case 4 is composed of a non-magnetic material. Against the engagement unit (a), the other engagement unit (b) is structured with a ferromagnetic plate 3 and a ferromagnetic bar 6 which is provided on such ferromagnetic plate 3 and reaches the other bar 7 through the hole 1a and fitting metals 5 having the bending leg pieces 5a to be caulked integratingly to the engagement unit (b).

Description

[Detailed Description of the Invention] This invention provides a retainer using a permanent magnet, in particular, for protecting the peripheral surface of a permanent magnet wire without reducing the magnetic force, and for integrally fixing a ferromagnetic plate or washer, etc. The present invention relates to the disclosure of an engaging tool having a non-magnetic case.

Therefore, for the purpose of protecting the magnet and attaching the ferromagnetic plate, this kind of engagement device using a permanent magnet is generally covered integrally with the exception of the central hole and the attached ferromagnetic plate. However, in this method, a non-magnetic material is interposed between the ferromagnetic mold, which is the other engaging member, and the magnetic pole face of the permanent magnet, and the distance is generally reduced. Because of the characteristic of magnets that their magnetic attraction force rapidly decreases in inverse proportion to the square of the square, the presence of such an interposition causes many problems.

In view of the inconveniences of the prior art, the present invention is designed to eliminate any inclusions that impede the magnetic attraction force on the magnetic attachment surface of the permanent magnet, and to make the permanent magnet magnetically attached in a detachable manner. The case has a structure in which the ferromagnetic plate is brought into direct contact with the magnetic pole surface of the magnet, thereby significantly improving the mutual magnetic attraction between the engaging members, and providing particularly sufficient protection of the periphery of the magnet. At the same time, it is possible to attach a ferromagnetic plate or an extra volume washer to the other side.

In addition, in the method described above, the desired close magnetic adhesion state could be created only by maintaining the smoothness of the magnet end face, and the dimensional accuracy of the case itself or the precision of the mounting is particularly important. It is possible to create or assemble a relatively rough case without any problems.

In addition, the case structure shown in the figure not only requires less case material, but is also easy to manufacture and can be mass-produced, significantly reducing the assembly cost and the manufacturing cost of the engaging tool. This made it possible.

In order to take advantage of the above-mentioned characteristics, the gist of the invention is particularly set in the structure described in the claims, and the following specific embodiment and considerable design changes from this embodiment are planned.

Hereinafter, details of the present invention will be explained with reference to a typical embodiment shown in the drawings. (1) is a permanent magnet, and an engaging hole (1) a is formed from one of its magnetic pole faces toward the other magnetic pole face. (2) shows a ferromagnetic plate that is planned to be attached to one of the magnetic pole faces of this magnet (1), and is attached to the magnet (1) with a case (4).

This case (4) is made of a non-magnetic material, such as a brass plate, and is generally similar to the magnet (1).
It has a cylindrical shape that matches the outer shape of the tube, and has a flange (4) a on the inside of its upper end and a bent piece (4) b integrally protruding along its lower edge.

Further, (5) is a washer for attachment to a handbag base plate, etc., and is formed by integrally bending the bent leg pieces (5)a to (5)a.

In addition, an engaging stepped portion (1)b is provided in the shoulder portion of the outer circumference of the upper end of the magnet (1) in the description, and the case (4) is attached to this engaging stepped portion (1)b. The magnet (1) is fitted into the case (4) so as to engage the edge collar (4) a, and the rod (7) is mounted on the ferromagnetic plate (2). 7
) protrudes from the plate (2) and attaches a washer (5) to it.
) are caulked, and bent pieces (4)b to (4)b are bent onto this plate (2) in order to integrate these members.

For one engagement tool a, connect the ferromagnetic plate (3) and the previous rod (7) through the hole (1) a on the surface of this ferromagnetic plate (3).
) and a ferromagnetic rod (6) with a length dimension of
5) For installation with a, the washer (5) is caulked into one piece.

Further, in the embodiment shown in Fig. 2, the rod (7) extends to the opening edge of the hole (1) a, so that it can be magnetically attached to the plate (4) of the direct engagement tool. The outer circumferential end of the plate (4) is bent to form an edge flange (4)a for preventing lateral slippage.

In addition, both rods (8) and (7) in Sho-F should have rounded ends. In other words, by reducing the amount of mutual contact between the end surfaces, the magnetic flux distribution passing through the holes is intended to strengthen the magnetic adhesion force, and at the same time, magnetic leakage is prevented as much as possible by providing a structure that does not contact the inner circumferential wall surface of the hole (1)a. It is something.

Next, in the embodiment shown in FIG. 3, the end face of the magnet (1), especially the end face in contact with the plate (3), is made into a concave spherical shape, and the corresponding plate (3) is made into a convex spherical shape. The hole in the rod (6) (
1) It is designed to ensure smooth engagement with a, and the creation of the spherical surface shown in (a) also brings about good results in plating processing.

Furthermore, in the embodiment shown in FIGS. 4 and 5, the small diameter push part (7) a of the rod (7) is made into a pin shape as a substitute for the washer (5), and the decorative button (9) is used. ) (1'O
), etc., and other equivalent installation methods are planned.

The embodiment shown in FIG. 6 shows an embodiment in which the engaging step portion (1)b is set slightly deeper and the case (4) is lower than the end surface of the magnet (1).

The present invention has the characteristic structure described above, particularly a cylindrical case (
4) When attaching the magnet (1) and plate (2), we aim to achieve an integral W attachment of the metal fittings and at the same time protect the outer periphery of the magnet (1), thereby achieving the specific effect of the above-mentioned characteristics. This is what I did.

This makes it possible to mass-produce an engaging tool that is low in cost, easy to assemble, and has a good magnetic force.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an engagement tool which is a typical embodiment of the present invention, and FIGS. 2 to 6 are sectional views showing other embodiments. In addition, in the figure (1)...magnet, (2)-(3)...ferromagnetic plate, (4)...case, (5)...washer, (6)
~(7)...Ferromagnetic rod, (8)...Ferromagnetic plate, (9
)...decoration button, (IQ)...indicates nut. Fig. l Fig. n a Fig. 3 Village n Fig. 2 / Fig. 4 q' Fig. 6 Fig. 5

Claims (1)

[Claims] Holding hole (1) from one magnetic pole surface to the other magnetic pole surface
A permanent magnet (1) has a magnetic pole face, and a ferromagnetic plate (2) is attached to one magnetic pole face, and a metal fitting is attached by laminating the plate parts, and the inner periphery is fitted from the other magnetic pole face. The bending piece (4)b, which is formed by protruding from the opening edge of the cylindrical non-magnetic case (4) having a flange (4)a, is attached by folding the metal fitting onto the plate surface. The plate (2) and its mounting are made so that the metal fittings are fixed to the magnet (1) in one piece, and the rod (7) is installed flush with the plate (2) in the hole (1) a. Hold the member with the small diameter rod that is inserted into the plate (2) of the rod (7), and then attach the magnet (1).
A ferromagnetic plate (3) that is removably magnetically attached to the exposed end face of the
and the ferromagnetic plate (2) are brought into contact with each other through the hole (1)a so as to be able to be magnetically attached and detached.