JPS6218703B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the disclosure of an engaging tool using a permanent magnet that is easy to use and has a simple structure and low manufacturing and assembly costs.

One of the anticipated main objectives of the present invention is to make the magnet as small and simple in external shape as possible, without requiring any special measures for the magnet itself, such as drilling an engaging hole. In addition, the structure of the ferromagnetic plate itself, which can be freely engaged and detached, should be as simple as possible, and if this would reduce manufacturing and assembly costs and at the same time make it possible to provide as small a fastener as possible, It was placed in such a way that it could be confirmed.

Next, one of the other main objects anticipated in the present invention is that the engaging tube portion of the ferromagnetic plate can contact only the other ferromagnetic plate without directly contacting the circumferential surface of the permanent magnet. By having an abutting structure and concentrating the magnetic closed circuit only in that portion, the reduction in the attraction force caused by the dispersion of the magnetic closed circuit can be suppressed as much as possible.

Furthermore, one of the other main objects anticipated in the present invention is to make the tip of the engaging tube part of the ferromagnetic plate into a convex spherical shape as necessary, and to make the abutting magnetic field of the engaging tube part The surface of the ferromagnetic plate to be attached is recessed into a concave spherical shape, a spherical receiving structure is prepared, and a considerable swing gap is provided between the ferromagnetic plate having the engagement tube portion and the case. By doing so, the magnetically attached state can be accurately maintained even when the angle of the engaging object itself is changed.

Next, one of the other main objects anticipated in the present invention is to improve the swing gap between the ferromagnetic plate and the permanent magnet and between the ferromagnetic rod and the peripheral surface of the permanent magnet. The dimensional tolerance range of permanent magnets used with a magnetic gap (a gap designed to prevent magnetic short circuit) is relatively wide, and permanent magnets with uneven dimensions can be used for assembly. This is intended to simplify attachment and significantly reduce manufacturing costs.

Furthermore, the various other objects anticipated in the present invention will be made clear in turn with the following explanation, and the present invention will take advantage of appropriate and purposeful effects of these characteristics. In order to achieve this, the main structure of the case 4 is a box-shaped case 4 made of a non-magnetic material with an open bottom surface, and a hole 4c is provided at a position biased toward one side wall 4b of the upper wall 4a of the case 4. At the same time, one magnetic pole surface a is brought into close contact with the inner surface of the upper wall 4a of the case 4, where the peripheral edge of the hole 4c is folded inward to form a flange 4d, and the flange 4d and the flange 4d of the case 4 are brought into contact with each other. A rectangular parallelepiped permanent magnet 1 is interposed between the other side wall 4b', and a ferromagnetic plate 2 is attached and fixed to the other magnetic pole surface b of the permanent magnet 1.
An engagement tool A in which one side end 2a of the ferromagnetic plate 2 protrudes laterally from the case 4, and a recess 3 is formed on the surface of the ferromagnetic plate 2 corresponding to the hole 4c in the case 4; and the case. The L-shaped ferromagnetic plate 5 is bent along the side wall 4b' of the case 4 and is in contact with the upper wall 4a of the case 4. The hole 4 of the case 4 has an engaging tube portion 6 in the shape of a bottomed tube with a constricted protrusion.
In addition, considerable design changes are planned to be made in conjunction with such a configuration point. This is what I did.

The details of the present invention will be described below with reference to a typical embodiment shown in the drawings. A is a female engagement tool, and the engagement tool A includes a case 4, a rectangular parallelepiped permanent magnet 1, and a ferromagnetic plate. 2, the case 4 is made of a non-magnetic material and has a box shape with an open bottom surface, and a hole 4c is opened at a position biased toward one side wall 4b of the upper wall 4a of the case 4. The peripheral edge of the hole 4c is folded inward to form a collar 4d. Further, the permanent magnet 1 is interposed between the flange 4d and the other side wall 4b' of the case 4, with one magnetic pole surface a brought into close contact with the inner surface of the upper wall 4a of the case 4, and the permanent magnet 1 A ferromagnetic plate 2 is attached to the other magnetic pole surface b of the case 4, and is fixed by engaging the open side ends of the side walls 4b and 4b' of the case 4, and one side end 2a of the ferromagnetic plate 2 is The engaging tool A is protruded laterally from the side wall 4b of the case 4, and the surface of the ferromagnetic plate 2 corresponding to the hole 4c of the case 4 is recessed in a concave spherical shape.

B is a male engagement tool, and the engagement tool B consists of a substantially L-shaped ferromagnetic plate 5 and an engagement tube part 6 protruding from the ferromagnetic plate 5. Flat plate part 5 that comes into contact with and is attracted to the upper surface of case 4 upper wall 4a of engagement tool A
a and a side plate part 5b bent along the side wall 4b' of the case 4, forming a substantially L-shape, and having a flat plate part 5.
The hole 4 of the case 4 of the engaging tool A is located on the lower surface of the end of a.
An engaging tube portion 6 is provided in a bottomed tube shape and protrudes constrictedly, and the free end of the engaging tube portion 6 is in contact with the recessed portion 3 of the ferromagnetic plate 2 via c. It has a suitable convex spherical shape.

Thus, the engagement tools A and B come into contact with the ferromagnetic plate 2 by intervening the engagement tube part 6 of the engagement tool B into the hole 4c of the engagement tool A, and the permanent magnet 1 A magnetic gap 7 is interposed between the ferromagnetic plates 2 and 5 to prevent magnetic short circuits, and a magnetic closed circuit is formed by the ferromagnetic plates 2 and 5 and the engagement tube part 6 to disperse and dilute the magnetic force. This is to ensure that this is prevented.

In addition, the contact magnetization position of the engaging tube portion 6 on the ferromagnetic plate 2 is provided with a concave spherical surface 3, and a convex spherical surface matching this concave spherical surface is provided on the distal end surface of the engaging tube portion 6. As a result, even when the ferromagnetic plate 5 is pressed and moved in the peeling direction, the concave spherical surface and the free end of the engagement tube part 6 continue to maintain a close contact state, which prevents the risk of separation. This is done in such a way that it can be reduced as much as possible.

Due to the presence of such a spherical surface, the ferromagnetic plate 5
It is possible to provide a slight swing gap 9 between the magnet 1 and the case 4, and the existence of such a swing gap 9 eliminates the need for strict dimensional accuracy of the magnet 1.
This allows the use of relatively rough magnetic products.

In addition, for the basic structure of the engaging device described above, various mounting structures are planned for attaching it to handbags and other objects as appropriate. A typical example is one in which mounting holes 8, such as chains, are drilled in the mounting bases of each of the ferromagnetic plates 2 and 5 as a fastening means for string-like products such as necklaces, pendants, and bracelets.

The present invention has the characteristic configuration described above,
It is expected that the above-mentioned characteristics will be achieved in a concrete manner, and since there is no need to modify the permanent magnet 1 and strict dimensional accuracy is not required, not only the material cost but also the assembly cost can be reduced. It is relatively inexpensive, and the magnet 1 is fixed to one side, and a pair of ferromagnetic plates 2 and 5 are magnetically attached to the side of the magnet 1 without contacting the magnet 1. In particular, its magnetic adhesion is significantly strengthened,
This, together with the above-mentioned features, makes it possible to provide a lightweight and ultra-compact engaging tool.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an engagement tool showing a typical embodiment of the present invention, and FIG. 2 is a sectional view thereof. In the figure, 1... permanent magnet, 2... ferromagnetic plate, 4... case, 5... ferromagnetic plate, 6... engaging tube part, 7... gap,
8... Attachment hole, 9... Swing gap.

Claims (1)

[Claims] 1 A case 4 made of a box-shaped non-magnetic material with an open bottom surface, and a hole 4c is opened in a position biased toward one side wall 4b of the upper wall 4a of the case 4, and One magnetic pole surface a is brought into close contact with the inner surface of the upper wall 4a of the case 4, the peripheral edge of which is folded inward into the hole 4c to form a flange 4d, and between the flange 4d and the other side wall 4b' of the case 4. A rectangular parallelepiped permanent magnet 1 is disposed in a sandwich-like manner, and a ferromagnetic plate 2 is attached and fixed to the other magnetic pole face b of the permanent magnet 1, and one end 2a of the ferromagnetic plate 2 is attached to the case. The hole 4 in the case 4 projects laterally from the hole 4 in the case 4.
The engaging tool A, in which the ferromagnetic plate 2 surface corresponding to c is recessed 3 in a concave spherical shape, contacts and is attracted to the upper surface of the upper wall 4a of the case 4, and is attached along the side wall 4b' of the case 4. The lower surface of the end of the bent L-shaped ferromagnetic plate 5 in contact with the upper wall 4a of the case 4 has a constricted protrusion, and is a bottomed tube-shaped engaging tube portion with a convex spherical tip. 6, and an engaging tool B which is attached to the recessed portion 3 of the ferromagnetic plate 2 through the hole 4c of the case 4 so as to be able to be adsorbed and removed.