JPH01319912A - Fixing tool - Google Patents

Abstract

PURPOSE:To slide the attracting surface of a ferromagnetic plate and to bring the 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, and providing a leg member 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 4. 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 the case 4 on the side of a surface (b) of a magnetic pole and a tip surface 2a' of a ferromagnetic projection 2a. The lines of magnetic force at the tip position of the protruding edge 4d are less in comparison with the surface 4c and the tip surface 2a' of the projection 2a, and the attracting force of said tip position is weak. Therefore, the ferromagnetic plate 3 can be readily slidden. Since a leg member 6 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 member 6 is attached. In this way, the attracting surface of the ferromagnetic plate 3 is readily slidden and brought into contact with the inside of the recess part 7 tightly.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is a pair of suction tools that utilize the suction force of permanent magnets, and the suction force can reduce the negative effects that the lines of magnetic force emitted from the suction surface have on others when not suctioned. 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. 4 to 6. Permanent magnet 1 and the permanent magnet! The suction tool A consists of an adsorbent A made up of a ferromagnetic plate 2 attached to the magnetic pole surface aL of the adsorption tool A, and an adsorbed tool B made of a ferromagnetic plate 3 that comes into contact with the magnetic pole surface aL of the adsorption tool A. ,
A ferromagnetic ring portion 2a constituting a magnetic path protruding from either or both of the ferromagnetic plates 2.3 in the attracted tool B;
3a are detachably attracted to each other or to the ferromagnetic plate 2 or 3 through the hole 1a of the suction 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 frame 2a or i*3a, which serves as a magnetic path, reduces the suction force of the fastener, so the Ferromagnetic plate 3 of the attracting device B of the stop that can be invited in Figure 6
There was one that had lost its protruding edge.

However, when adhering tool B to the magnetic pole face of adsorbing tool A, the adsorbing surfaces of the two do not match properly, and the adsorbed tool B becomes immobile, and the magnetic pole surface becomes sticky. 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 is designed to be able to easily shift the suction position so that the suction tool A and the suction target B are attracted to each other facing each other, and also to be easily positioned to the correct position where they face each other. It is an object.

(Problems and Means for Solving the Problems) The present invention has been provided to achieve the above-mentioned goals, and includes a plate-shaped permanent magnet 1 having holes 1a extending in the direction of the magnetic poles, and A non-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 non-magnetic or non-magnetic case 4 attached to the other magnetic pole face a and integrated with the permanent magnet 1 by the case 4. a ferromagnetic plate 2 fixed to the ferromagnetic plate 2; a ferromagnetic protrusion 2a which is erected on the ferromagnetic plate 2 and whose tip end face 2a' is flush with or slightly protruding 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 facing side of the case 4 surrounded by 4d, and a mouth-shaped leg is provided on the non-adsorption surface of the ferromagnetic plate 3. The member 6 is welded.

(Function) When the stop having the above structure is used to attract the ferromagnetic plate 3, the ferromagnetic plate 3 is pressed against the tip of the protruding circumference Iti4d of the case 4 while sliding it. When it is inserted into the magnetic pole face side surface 4c of the case 4 and the tip surface 2a' of the ferromagnetic protrusion 2a, the tip position of the protruding peripheral edge 4d is aligned with the surface 4C and the tip surface of the ferromagnetic protrusion 2a. 2a', there are fewer lines of magnetic force and the attraction force is weaker, so it is easier to slide the ferromagnetic plate 3, and by adhering it by dropping it into the recessed part 7, the magnetic plate 3 is strong and the magnetic plate 3 is attached to the magnetic pole surface. Directly face it and absorb it.

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-adsorption surface of the ferromagnetic plate 3 by welding, no tension or pressure is applied to the ferromagnetic plate 3 when the leg members 6 are attached, so that the ferromagnetic plate 3 is thin. Even if the suction surface is not uneven, the suction tool A is in close contact with the suction tool A, and the suction tool A is efficiently suctioned.

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

Reference numeral 1 denotes a buried plate-like 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. 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 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 side end.

In addition, the ferromagnetic plate 2 has a ferromagnetic protrusion 2a that is connected to the hole 1 of the permanent magnet l.
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 4 on the side facing the magnetic pole of the case 4.
The protrusion 2a is flush with C or has a slightly protruding shape, and the projection 2a is erected by inserting the small-diameter ring portion 2b at the rear 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 this protrusion 2a
The tip surface 2a' of the case 4 is attached to the surface 4C of the case 4. Also, this surface 4ck: has a protruding peripheral edge 4d on the peripheral edge.
A concave portion 7 in which the ferromagnetic plate 3 is accommodated is formed by the intersecting circle Q4d and the surface 4c of the case 4 surrounded by the protruding peripheral edge 4d. The tip of the protruding peripheral edge 4d is rounded so that the ferromagnetic plate 3 can easily slide into the recessed portion.

Further, a mouth-shaped mounting leg member 6 is provided on the non-adsorption surface of the ferromagnetic plate 3.
is attached to the tip surface 2a' of the ferromagnetic protrusion 2a in order to effectively apply the attraction force.
In order to prevent unevenness from occurring on the surface of the ferromagnetic plate 3, the leg members 6 are attached by welding such as spot welding, brazing, soldering, etc.

(Effects) Since the stop according to the present invention is configured as described above, by making the adsorption surface of the ferromagnetic plate 3 contact the tip of the protruding peripheral edge 4d from the side of the case 4 and sliding it. The attraction surface of the ferromagnetic plate 3 moves 8 times without making surface contact with the surface 4c on the magnetic pole facing side of the case 4, so it slides easily without stickiness, and forms a recess at a position directly facing the magnetic pole facing surface. It fits into the part 7 and sticks tightly.

In addition, since the case surface 4C of the magnetic pole face to which the two ferromagnetic plates 3 are attracted forms the bottom of the concave portion 7 formed by the protruding peripheral edge 4d, magnetic cards etc. that are easily affected by magnetic lines of force are directly attached to the case surface 4c. Even when the ferromagnetic plate 3 of the attracted tool is not attracted, there is no adverse effect of magnetism on others.

Moreover, since no magnetic shielding plate is attached, there is no reduction in the adsorption force, and there is no risk of displacement due to the protruding peripheral edge 4d if the adhesion is sufficiently applied.

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 explanation of the drawing]

Fig. 1 is a sectional view of an embodiment of the fastener according to the present invention, Fig. 2 is an exploded perspective view of the same, Fig. 3 is a sectional view of the same showing the sliding state of the suction target, and Figs. M4 to 6 are conventional FIG. 3 is an example cross-sectional view. DESCRIPTION OF SYMBOLS 1... Permanent magnet, 1a... Hole, 2.3... Ferromagnetic plate, 2a... Ferromagnetic protrusion, 2a'... Tip surface, 4...
...Case, 4a...hole, 4d...projection edge, 5.6
... Mounting leg member, 7... Recessed part, A... Suction 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; and 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 that is erected on the ferromagnetic plate 2 and whose tip surface is flush with or slightly protruding from the surface on the magnetic pole surface b side of the case 4; a tip surface of the ferromagnetic protrusion 2a; The attracting surface of the ferromagnetic plate 3 in the case 4 is provided with a protruding periphery on its peripheral edge, and the ferromagnetic plate 3, which is surrounded by the protruding periphery, A concave portion in which the ferromagnetic plate 3 is accommodated is formed by the surface of the case 4 on the magnetic pole surface b side, and a ■-shaped leg member is welded at its center on the non-adsorption surface of the ferromagnetic plate 3. A fastener characterized by: