JPS62563B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is an engagement tool using a permanent magnet, which has good assembly properties and smooth engagement during use. The present invention relates to the disclosure of an engaging tool which is particularly designed to reduce accidents such as destruction of the magnetic recording portion.

(Prior art) Conventional fasteners using permanent magnets of this type are those disclosed in Japanese Patent Publication No. 59-49995 and Utility Model Publication No. 54-3923, and the outer case is generally made of metal such as brass material or non-ferrous metal. A metal material was used, and the contact end surface of the male tool, which was magnetically and removably abutted, was made into a flat surface.

(Problems to be Solved by the Invention) In such a conventional structure, the members constituting the engagement tool tend to fit loosely and require a lot of work and effort to install. In addition, with such conventional engagement tools, it is difficult to grasp the engagement position, and when engaging, the contact end surface of the female engagement tool is rubbed by the engagement rod of the male tool, and the surface of the female tool is rubbed. In addition to often causing scratches, there have been many unexpected problems such as destruction of magnetic recording due to lines of magnetic force peculiar to magnets.

(Means for Solving the Problems) The engaging tool according to the present invention has been devised to solve the problems in the conventional example, and is capable of connecting from one magnetic pole surface a to the other magnetic pole surface a. An engagement tool consisting of a permanent magnet 1 having a hole 1a facing a surface b, and a ferromagnetic plate 3 that is attracted to one magnetic pole surface a of the permanent magnet 1, the engagement tool being protruded from the ferromagnetic plate 3. The ferromagnetic protrusion 3a is removably attracted to the ferromagnetic plate 2 attached to the other magnetic pole surface b in the hole 1a or the ferromagnetic protrusion 2a protruding from the ferromagnetic plate 2, and the ferromagnetic protrusion 3a The surface a is a concave spherical surface that is gently inclined toward the hole 1a from the circumferential side of the one magnetic pole surface a, and the ferromagnetic plate 3 is formed so that the ferromagnetic protrusion 3a is formed from the circumferential side of the ferromagnetic plate 3. In the engagement tool, the concave spherical surface of the one magnetic pole surface a and the convex spherical surface of the ferromagnetic plate 3 are closely attracted to each other. The magnetic plate 2 is fitted into a cylindrical synthetic resin case 5 with the magnetic pole surface a of the permanent magnet 1 positioned inward from the upper cylindrical edge of the synthetic resin case 5. The ferromagnetic plate 3 is attracted to the concave spherical surface without leaving a magnetic gap.

(Embodiment) Below, details of the present invention will be described with reference to a typical embodiment shown in the drawings. Reference numeral 1 refers to a permanent structure in which an engaging hole 1a is opened from one magnetic pole surface a to the other magnetic pole surface b. A ferromagnetic plate 2 is attached to one magnetic pole surface a of this permanent magnet 1, and this is press-fitted and fitted into a cylindrical synthetic resin case 5, and the other magnetic pole surface b is attached to a ferromagnetic plate 2. The ferromagnetic plate 3 is brought into contact with the ferromagnetic plate 3 in a detachable manner.

The plate surface of the ferromagnetic plate 3 having such a configuration is a concave spherical surface that is gently inclined from the circumferential side toward the hole 1a, and the ferromagnetic plate 3 protrudes from either or both of the ferromagnetic plates 2 and 3. The protrusions 2a, 3a are configured to be able to be removably attracted to the other ferromagnetic plates 2, 3 or the end faces of the other ferromagnetic protrusions 2a, 3a.

Further, one magnetic recording tape or other magnetic recording tape which is adversely affected by the magnetism of one magnetic pole surface a by positioning one magnetic pole surface a of the permanent magnet 1 inward from the upper cylindrical edge of the cylindrical synthetic resin case 5. The ferromagnetic plate 3 is configured to prevent contact between objects such as the above, and the ferromagnetic plate 3 is attracted to the concave spherical surface of one magnetic pole surface a without leaving a magnetic gap.

The upper edge structure of the case 5 is further bent inward to form a short collar 5a that forms a predetermined gap above the permanent magnet 1.
(Fig. 3 to Fig. 8) In order to use the male and female engaging members constructed as described above as a means for fastening handbags, clothes, necklaces, etc., as shown in Figs. 1 to 4. The ferromagnetic plate 2 is fixed directly to the mounting board with double-sided adhesive tape or the like, and has a washer 7 having bent legs 7a, 7a, and a crimping tube 6 in the shape of a funnel or a funnel with a bottom that is used for crushing and crimping. , 3 by an appropriate method such as caulking, waxing, spot welding, screw attachment, or the like. (Figures 5 and 6) In the case where a ferromagnetic plate 4 is attached to one of the magnetic pole faces a to shield the magnetic lines of force of the permanent magnet 1, the prevention of destruction of magnetic recording such as a magnetic tape is further strengthened. There is also.
(Fig. 4) The engaging tool according to the present invention has a characteristic structure as described above, in particular, it is provided with a cylindrical case 5 that creates a magnetic gap of a required thickness on the outer peripheral surface of the permanent magnet 1, and is permanent. One magnetic pole surface a of the magnet 1 is configured to be a concave spherical surface,
Since this one magnetic pole surface a is located inward from the upper cylinder end of the case 5, various accidents caused by magnetic lines of force of the permanent magnet 1 may occur, such as destruction of magnetic recording parts of magnetic tapes, magnetic cards, etc., and ferromagnetic projections 2a. , 3a is effectively prevented.

Furthermore, since one of the magnetic pole surfaces a, which is the attracting surface, is a concave spherical surface, the ferromagnetic protrusion 3a during engagement can be guided by the concave spherical surface and naturally slide into the hole 1a, making engagement easy. Moreover, there is little chance of scratches on the suction surface.

Furthermore, since the case 5 is particularly made of synthetic resin, it is sufficient to assemble the engagement tool by just fitting it, and the assembly is simple and the permanent The magnet 1 is sufficiently buffered against external forces, and can be reliably prevented from being broken or scratched not only during assembly but also after assembly.

Furthermore, due to the material characteristics of the case 5, manufacturing costs and assembly costs are particularly low, and the appearance can be made in a color tone that particularly matches the ground color of the surface to be used.

[Brief explanation of the drawing]

1 to 8 are cross-sectional views showing each embodiment of the present invention. 1...Permanent magnet, 2a, 3a...Ferromagnetic protrusion,
2 to 4...Ferromagnetic plate, 5...Case, 6...Washer.

Claims (1)

[Claims] 1. A permanent magnet 1 having a hole 1a extending from one magnetic pole surface a to the other magnetic pole surface b, and a ferromagnetic plate 3 attracted to one magnetic pole surface a of the permanent magnet 1. The ferromagnetic protrusion 3a protruding from the ferromagnetic plate 3 engages the other magnetic pole surface b within the hole 1a.
is removably adsorbed to the ferromagnetic plate 2 attached to the ferromagnetic plate 2 or the ferromagnetic protrusion 2a protruding from the ferromagnetic plate 2, and the one magnetic pole surface a is attached to the one magnetic pole surface a.
The ferromagnetic plate 3 has a concave spherical surface that gently slopes toward the hole 1a from the circumferential side of the ferromagnetic plate 3.
has a convex spherical surface that gently slopes toward the ferromagnetic protrusion 3a from the circumferential side thereof, and the concave spherical surface of the one magnetic pole surface a and the convex spherical surface of the ferromagnetic plate 3 are in close contact with each other and are attracted to each other. In the device, the permanent magnet 1 and the ferromagnetic plate 2 are placed in a cylindrical synthetic resin case 5, and the one magnetic pole surface a of the permanent magnet 1 is positioned inward from the upper cylindrical edge of the synthetic resin case 5. The ferromagnetic plate 3 is fitted onto the concave spherical surface of the one magnetic pole surface a without leaving a magnetic gap.