JPH01319913A - Fixing tool - Google Patents

Abstract

PURPOSE:To slide the attracting surface of a ferromagnetic plate readily and to bring the attracting surface into contact with the inside of a recess part tightly by bringing the attracting surface of the ferromagnetic plate into contact with the tip of a protruding edge from the side of a case, sliding the attracting surface into recess part, and providing a tubular leg member having a flange and a bottom for attaching a tool to be attracted. CONSTITUTION:The attracting tool of a ferromagnetic plate 3 is brought into contact with the tip of a protruding edge 4d of a case. The attracting tool is made to slide. The ferromagnetic plate 3 is placed in a recess part 7. The plate is attracted to a surface 4c of a case 4 on the side of a surface (b) of a magnetic pole and a tip surface 2a' of a ferromagnetic projection 2a' lines of magnetic force of the tip position of the protruding edge 4d are less in comparison with the surface 4c and the tip surface 2a'. The attracting force of said tip position is weak. Therefore, the ferromagnetic plate 3 can be slidden readily. Since a tubular leg member 6 having a flange 6a and a bottom is attached to the non-attracting surface of the ferromagnetic plate 3 by welding, shock and pressure are not especially applied to the ferromagnetic plate 3 when the leg part 6 is attached. In this way, the attracting surface of the ferromagnetic plate 3 is readily slidden and brought into contact in the recess part 7 tightly.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention is a pair of adsorbers that utilize the adsorption force of permanent magnets. The present invention relates to a fastener that prevents the deterioration of the suction surface and that allows a pair of fasteners made of a suction tool and a suction target to easily join their suction surfaces together without shifting from each other.

(Prior art) A conventionally used stop that utilizes the attraction force of a permanent magnet has a hole 1a extending from one magnetic pole surface a to the other magnetic pole surface, as shown in FIGS. 6 to 8. An adsorbent A made up of a permanent magnet 1 and a ferromagnetic plate 2 attached to the 6ngi surface a of the permanent magnet 1, and an adsorbed object made of a ferromagnetic plate 3 that comes into contact with the magnetic pole face of this adsorption tool A. A ferromagnetic ring part 2 constituting a magnetic path protruding from either or both of the adsorbing tool A and the ferromagnetic plate 2.3 of the adherend tool B.
There is one in which the suction device A is removably adsorbed to each other or to the ferromagnetic plate 2 or 3 through the hole 1a of the adsorption tool A.

(Problem to be Solved by the Invention) However, all of the above-mentioned fasteners are provided with a convex part such as a ferromagnetic ring part 3a or a protruding peripheral edge on the surface of the ferromagnetic plate 3 of the attracted tool A, Objects tend to get caught, which is a problem in handling, but omitting the ferromagnetic ring portion 2a or 3a, which serves as a magnetic path, reduces the attraction force of the stopper, so the attraction force is not affected as shown in Fig. 8. There was one in which the protruding edge of the ferromagnetic plate 3 of the attracting device B of the stopper was eliminated.

However, when adsorbing tool B to the magnetic pole face of adsorbing tool A, the adsorption surfaces of the two do not match correctly, and the adsorbed tool B becomes unable to move due to stickiness. When a shield plate is attached to the magnetic pole surface to prevent the harmful effects of the emitted magnetic lines of force on others, the above-mentioned stickiness is eliminated, but there are problems such as a decrease in the adsorption force.

The stopper according to the present invention can easily shift the suction position so that the above-mentioned suction tool A and the suction target B are attracted to each other facing each other, and can also be easily positioned to the correct position where they face each other. It is an object.

(Means for Solving Problem B!) The present invention is provided to achieve the above-mentioned goal, and includes a plate-shaped permanent magnet l having holes 1a extending in the direction of the magnetic poles, and A magnetic or non-magnetic case 4 having a hole 4a communicating with the hole 1a and covering at least one magnetic pole face and a side surface, and a magnetic or non-magnetic case 4 attached to the other magnetic pole face a and connected to the permanent magnet 1 by the case 4. a ferromagnetic plate 2 that is fixed integrally; a ferromagnetic protrusion 2a that is erected on the ferromagnetic plate 2 and whose tip end surface 2a' is flush with or slightly protrudes from the surface 4c of the case 4 facing the magnetic pole; a tip surface 2a' of the ferromagnetic protrusion 2a;
It consists of a ferromagnetic plate 3 that is attracted to a surface 4c on the magnetic pole facing side of the case 4, and a protruding peripheral edge 4d is provided on the peripheral edge of the attracting surface of the ferromagnetic plate 3 in the case 4, and the protruding peripheral edge A concave portion 7 in which the ferromagnetic plate 3 is accommodated is formed by a surface 4c on the magnetic pole side of the case 4 surrounded by 4d, and a bottomed tubular leg having an outward facing edge 6a at the open end. The structure is such that the member 6 is welded to the non-attractive surface of the ferromagnetic plate 3 at its edge 6a.

(Function) When the stop having the above structure is used to attract the ferromagnetic plate 3, the ferromagnetic plate 3 is placed in a recess while being slid by placing the adsorbing tool of the ferromagnetic plate 3 on the tip of the protruding peripheral edge 4d of the case 4. Put it in section 7,
When the magnetic pole face side surface 4C of the case 4 and the tip surface 2a' of the ferromagnetic protrusion 2a are attracted, the tip position of the protruding peripheral edge 4d is closer to the magnetic field line than the surface 4c and the tip surface 2a' of the ferromagnetic protrusion 2a. Since the ferromagnetic plate 3 is small and the attraction force is weak, it is easy to slide the ferromagnetic plate 3, and by dropping it into the concave portion 7 and adsorbing it, the ferromagnetic plate 3 is attracted directly to the magnetic pole face.

In addition, the protruding peripheral edge 4d is such that when the ferromagnetic plate 3 is not attracted to the magnetic pole facing side of the permanent magnet 1, an article such as a magnetic card that is easily affected by the adverse effects of magnetic lines of force comes into surface contact with the case 4 surface on the magnetic pole facing side. prevent this from happening.

That is, since the magnetic card or the like is supported outside the range of influence of magnetic action on the protruding peripheral edge 4d, the influence of magnetism is eliminated.

Furthermore, since the leg members 6 are attached to the non-adsorbing surface of the ferromagnetic plate 3 by welding, no particular impact or pressure is applied to the ferromagnetic plate 3 when the leg members 6 are attached. Even if there is, no unevenness will occur on the suction surface, and the suction tool A will come into close contact with the suction tool A for efficient suction.

(Example) Examples of the fastener according to the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes a top plate-shaped permanent magnet having a hole 1a extending in the magnetic pole direction, and a disk-shaped ferromagnetic plate 2 having approximately the same diameter as the permanent magnet 1 is provided on one magnetic pole surface a of the permanent magnet 1. It is fitted in a non-magnetic case 4 made of anti-magnetic material such as stainless steel or made of brass, which covers the magnetic pole face and the side surface having a hole 4a communicating with the hole 1a. The ferromagnetic plate 2 is held integrally with the permanent magnet 1 by a locking piece 4b provided at the end.

In addition, the ferromagnetic plate 2 has a ferromagnetic protrusion 2a that is connected to the hole 1 of the permanent magnet 1.
This protrusion 2 is provided with a gap between it and the peripheral wall of a.
The tip surface 2a' of a is the surface 4C on the magnetic pole facing side of the case 4.
The protrusion 2a is flush with or has a slightly protruding shape, and the protrusion 2a is erected by inserting the rear small-diameter ring portion 2b into a hole provided in the ferromagnetic plate 2 and caulking it. A mounting leg member 5 is attached to the non-attracting surface side of the ferromagnetic plate 2 to constitute an adsorbing tool A, and the adsorbing tool is made of a ferromagnetic plate 3 having a disk shape with approximately the same diameter as the permanent magnet 1. B is adapted to be attracted to the tip surface 2a' of this protrusion 2a and the surface 4c of the case 4. Further, this surface 4c is provided with a protruding peripheral edge 4d at the peripheral edge, and a recessed part 7 in which the ferromagnetic plate 3 is accommodated is formed by this protruding peripheral edge 4d and the surface 4c of the case 4 surrounded by this protruding peripheral edge 4d. There is. The tip of the cross circle Q4d is rounded so that the ferromagnetic plate 3 can easily slide into the concave portion 7.

In addition, a bottomed tubular leg member 6 having an outward facing edge 6a at the open end is attached to the non-adsorption surface of the ferromagnetic plate 3 by spot welding, brazing, soldering, etc. This prevents unevenness from occurring on the attraction surface of the magnetic plate 3. Figures 4 and 5 show the mounting state of the non-adsorption tool B, in which the leg member 6 is inserted into the hole in the mounting fabric 8 and the bottom side of the leg member 6 is crushed onto the surface of the mounting fabric 8 or the washer 9. and then install it.

(Effects) Since the stop according to the present invention is constructed as described above, by making the attraction surface of the ferromagnetic plate 3 contact the tip of the intersecting circle Ji4d from the side of the case 4 and sliding it. ,
The attraction surface of the ferromagnetic plate 3 does not come into surface contact with the surface 4C on the magnetic pole facing side of the case 4 and moves vertically, so it slides easily without stickiness and forms a concave depression at a position directly facing the magnetic pole surface. It fits into the part and sticks tightly.

In addition, since the case surface 4C of the magnetic pole face to which the ferromagnetic plate 3 is attracted forms the bottom of the concave portion 7 formed by the intersecting circle fi4d, magnetic cards etc. that are easily affected by magnetic lines of force are directly attached to the case surface 4C. ferromagnetic plate 3 of the suction tool
Even when it is not attracted, there is no negative effect due to magnetism on others.

Moreover, since no magnetic shield plate is attached, there is no reduction in the attraction force, and there is no risk of displacement due to the intersecting circle fi4d if it is attracted.

Further, since the leg member 6 for attaching the suction tool B is attached to the ferromagnetic plate 3 by welding, there is no unevenness on the suction surface, and it comes into close contact with the suction tool A and efficiently adsorbs it.

[Brief Description of the Drawings] Fig. 1 is a cross-sectional view of an embodiment of the stopper according to the present invention, Fig. 2 is an exploded perspective view of the same, Fig. 3 is a cross-sectional view of the same showing the sliding state of the suction target, and Fig. 4 and 5 are cross-sectional views of the embodiment with the non-adsorbing tool attached, and FIGS. 6 to 8 are cross-sectional views of the conventional example. DESCRIPTION OF SYMBOLS 1... Permanent magnet, la... Hole, 2.3... Ferromagnetic plate, 2a... Ferromagnetic protrusion, 2a'... Tip surface, 4...
・・Case, 4a-hole, 4d-・projection edge, 5.6・
...Mounting leg member, 7...Concave part, A...Adsorption tool, B
...Adsorbed tool, a, b...Magnetic pole surface

Claims (1)

[Claims] 1. A plate-shaped permanent magnet 1 having holes 1a extending in the magnetic pole direction
and a hole 4a communicating with the hole 1a of the permanent magnet 1,
a non-magnetic or non-magnetic case 4 that covers at least one magnetic pole surface b and a side surface; a ferromagnetic plate 2 attached to the other magnetic pole surface a and fixed integrally with the permanent magnet 1 by the case 4; A ferromagnetic protrusion 2a which is erected on the ferromagnetic plate 2 and whose tip surface is flush with or slightly protrudes from the surface on the magnetic pole surface b side of the case 4; the tip surface of the ferromagnetic protrusion 2a and the magnetic pole of the case 4; The case 4 has a ferromagnetic plate 3 that is attracted to the surface on the surface b side, and a protruding peripheral edge is provided at the peripheral edge of the attracting surface of the ferromagnetic plate 3 in the case 4, and the case 4 is surrounded by the protruding peripheral edge. A concave portion in which the ferromagnetic plate 3 is accommodated is formed by the surface on the magnetic pole surface b side of A fastener characterized by being welded to the non-adsorption surface of the plate 3.