JPS63224206A - Locking means - Google Patents

Abstract

PURPOSE:To make it possible to close a cover completely by a method wherein a ferromagnetic plate, having the hole communicating to another hole, is buried on the side of a magnetic pole surface, the diameter in one direction of the hole is long, and the diameter of a ferromagnetic protrusion in the direction orthogonally intersecting the above-mentioned direction is formed to be approximately equal to that of a ferromagnetic protrusion. CONSTITUTION:A permanent magnet 1 has an annular plate shape, a hole 1a is provided ranging from one magnetic pole surface (a) to the other magnetic pole surface (b), an annular plate-like ferromagnetic plate 4, having a hole 4a communicated to another hole 1a, is shallowly buried on the side of the magnetic pole surface (b) by performing an insert molding, the plastic magnet on the ferromagnetic plate 4 is thinned off, a protruding edge 1b is integrally provided in a line on the periphery of the magnetic pole surface (b), and the inside of the protruding edge 1b is formed into a recessed surface. Besides, a disc-shaped ferromagnetic plate 2 is insert-molded on the magnetic pole surface (a), it is stuck integrally formed with the permanent magnet 1 by adhesion and the like. On the ferromagnetic plate 2, a ferromagnetic protrusion 2a which is a magnetic interval the inner circumferential surface of the hole 1a is provided, said ferromagnetic protrusion 2a is attached by calking together with the washer-like leg member 5 on which a bent leg piece 5a is integrally provided on the opening surface of the ferromagnetic plate 2, and a female part fitting A is constituted. As a result, the cover is closed completely, and it is not opened carelessly and unintentionally.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention prevents the adverse effects of magnetic interference that is likely to be induced in a stop using a permanent magnet, and also prevents the adsorption from being accidentally removed. This relates to a stop that is not covered by a case.

(Prior Art) Conventionally, a permanent magnet is used, and a ferromagnetic plate 102 is attached to one magnetic pole surface a of a permanent magnet 101 having a hole 101a directed from one magnetic pole surface a to the other magnetic pole surface, and a ferromagnetic plate 102 is attached to the other magnetic pole surface a. Ferromagnetic protrusions 102a and 103a protruding from both sides of the ferromagnetic plate 103 that abuts the magnetic pole face are detachably attracted to each other via the permanent magnet 101 (7) hole 101a. This is a stopper in which the permanent magnet 101 is a plastic magnet, a case is not used, and a protruding edge 101b is provided around the periphery of the magnetic pole face on the side where the ferromagnetic plate 103 is brought into contact and attracted, so as to be close to the magnetic pole face. The present applicant has provided a stopper which prevents a magnetic recording card or the like from coming into close contact with the magnetic pole face so that magnetic recording is not adversely affected by lines of magnetic force leaking from the magnetic pole face.

(Problem to be Solved by the Invention) However, the above-mentioned stopper is
Since the ferromagnetic protrusions 102a and 103a are attracted to each other at the hole 101a, the diameter of the hole 101a is the same as that of the ferromagnetic protrusion 10.
3a, and when the attracted ferromagnetic protrusion 103a applies a lever-like force to the ferromagnetic plate 103 using one end as a fulcrum, the attraction due to the magnetic force will not occur. When the suction surface is tilted, the suction force is rapidly attenuated, so there is a problem that the ferromagnetic protrusion 103a is easily pulled out of the hole 101a of the permanent magnet 101 and the stopper is easily disengaged. Ta.

(Means for Solving the Problems) The present invention was provided to solve the above problems, and provides a permanent magnet having a hole 1a extending from one magnetic pole face a to the other magnetic pole face. A ferromagnetic plate 2 is attached to the magnetic pole face a of the magnetic pole face 1, and ferromagnetic protrusions 3a, 2a protruding from both the ferromagnetic plate 3 that comes into contact with the magnetic pole face and the ferromagnetic plate 2 are mutually connected to each other. , or a ferromagnetic protrusion 3 protruding from the ferromagnetic plate 3
A is a stop that is detachably attracted to the ferromagnetic plate 2, and the permanent magnet 1 has a curved edge 1b integrally provided around the periphery of the magnetic pole face, and the inside of the convex edge 1b is The ferromagnetic plate 3 has an adsorption concave surface, and a hole 1 is provided on the side facing the magnetic pole.
A ferromagnetic plate 4 having a hole 4a communicating with the hole 1a is buried, and the hole 1a has a long diameter d in one direction, and a diameter d° in a direction perpendicular to this is close to the diameter of the ferromagnetic protrusion 3a. It is a stop that is

(Function) The stop configured as above is the hole 1a of the permanent magnet 1.
Since the diameter d of one side of the ferromagnetic protrusion 3a is close to the diameter of the ferromagnetic protrusion 3a, even if a lever-like force with the other end as a fulcrum acts on one end of the attraction surface of the ferromagnetic plate 3 in this direction, , ferromagnetic protrusion 3a
The side surface of the hole 1a hits the edge of the hole 1a, and the ferromagnetic protrusion 3a cannot tilt, and therefore the ferromagnetic plate 3 cannot be lifted. It returns to its original state again due to the adsorption force.

However, when the ferromagnetic plate 3 is tilted in the direction of the long diameter d of the hole 1a using one end as a fulcrum, the ferromagnetic protrusion 3a is easily tilted, so the ferromagnetic plate 3 is easily lifted, and the ferromagnetic protrusion 3a is pulled out from the hole 1a, and the engagement is released.

In addition, when tilting the ferromagnetic plate 3 in the force direction of the above-mentioned diameter d°, the protruding edge 1b provided on the circumferential edge of the magnetic pole face also engages the circumferential side of the ferromagnetic plate 3, so that the ferromagnetic plate 3 and this The protruding ferromagnetic protrusions 3a engage at four locations in total, making them difficult to tilt.

Therefore, by attaching the hole 1a so that the shorter diameter d' is in the direction in which the lid of a bag or the like is inclined when it is opened, the lid can be maintained in a securely closed state, and the lid can be kept securely closed. The lid will not open.

Furthermore, since the ferromagnetic plate 4 is located close to the magnetic pole, all the magnetic lines of force of the magnet flow from this ferromagnetic plate 4 to the ferromagnetic protrusion 3a, and from the part of the permanent magnet 1 located on the outer side of the ferromagnetic plate 4 to the outside. The lines of magnetic force that leak out into the magnetic field are extremely weak, and the state is similar to that of a case covered with a non-magnetic case.Furthermore, the curved edge ib prevents magnetic cards, etc. that are in contact with the magnetic pole face, and prevents negative effects on magnetic recording. Ru.

Also, as mentioned above, the ferromagnetic plate 4 buried along the magnetic pole surface
Since the lines of magnetic force are focused by the ferromagnetic protrusion 3a, the lines of magnetic force are easily focused on the ferromagnetic protrusion 3a.

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

1 is a permanent magnet made of powder of ferrite, alnico, rare earth, and other hard magnetic materials and synthetic resin, and is disk-shaped, with a hole 1a opening from one magnetic pole surface a to the other magnetic pole surface. A top plate-like ferromagnetic plate 4 having a hole 4a communicating with a chain type 1a is buried shallowly on the magnetic pole face side by insert molding, and the thickness of the plastic magnet on this ferromagnetic plate 4 is thin. In addition, a convex edge 1b is integrally provided around the periphery of the magnetic pole face, and the four edges 1b
The inside is a recessed part. Further, a disk-shaped ferromagnetic plate 2 is inserted into the magnetic pole surface a by insert molding, molding, fitting, etc.
The ferromagnetic plate 2 is attached by adhesive or the like to be integrated with the permanent magnet l, and the ferromagnetic plate 2 is caulked with a ferromagnetic protrusion 2a that projects into the hole la at a magnetic distance from the inner peripheral surface of the hole 1a.
A washer-like leg member 5 having a pair of bent leg pieces 5a provided on the open surface of the ferromagnetic plate 2 is attached by caulking the ferromagnetic projections 2a, thereby forming a female fitting A.

Further, the ferromagnetic plate 3 has a disc shape with approximately the same diameter as the magnetic pole face, and the ferromagnetic protrusion 3a and the leg member 5 are integrally attached in the same manner as the ferromagnetic plate 1, and the male tool B is attached to the ferromagnetic plate 3. The ferromagnetic plate 3 is attracted to the perforated surface of the magnetic pole face of the female tool A, and at the same time, the ferromagnetic projection 3 is attracted to the ferromagnetic projection 2a within the hole la.

Further, the hole 1a of the permanent magnet 1 in the female tool A has a long diameter d in one direction, and a diameter d° in a direction perpendicular to this is close to the diameter of the ferromagnetic protrusion 3a of the male tool. . Note that the hole 4a of the ferromagnetic plate 4 has the same diameter or the same size as the hole 1a, and
If the shape is exactly the same as that of the hole 1a, it faces the periphery of the hole 1a, reinforcing the hole edge and focusing the magnetic field.

In FIGS. 4 and 5, the ferromagnetic protrusion 2a is not provided, and the ferromagnetic protrusion 3a of the male tool B is configured to have a length that allows it to be directly attracted to the ferromagnetic plate 2 of the female tool A.

Moreover, FIGS. 6 to 8 show the ferromagnetic plate 2 or 3 and the ferromagnetic protrusion 2.
a or 3a are integrally formed according to header specifications, and the leg member 5 is welded to this, or one end of a bottomed or bottomless tubular body is expanded into a funnel shape and welded. .

Figure 9 shows an example in which the leg member 5 with one end of the tubular body expanded into a funnel shape and wound around the winding periphery of the washer is crimped together when the ferromagnetic protrusion and the ferromagnetic plate are crimped. This is an example.

10 to 12 show that a tapered stepped engagement rod, a screw rod, a bottle, etc. are extended to the ferromagnetic protrusion 2a or 3a, and are inserted into the hole provided at the center of the ferromagnetic plate 2 or 3. This is a leg member that is inserted through the mounting fabric and fixed.

(Effects) In the stop according to the present invention, a ferromagnetic plate 2 is attached to the magnetic pole face a of a permanent magnet 1 having a hole 1a extending from one magnetic pole face a to the other magnetic pole face. ferromagnetic plate 3 in contact with
and the ferromagnetic plate 2.
, 2a are mutually or a ferromagnetic protrusion 3a protruding from the ferromagnetic plate 3 is a stop that is removably attracted to the ferromagnetic plate 2, and the permanent magnet 1 is attached to the magnetic pole face. A convex edge 1b is integrally provided around the periphery, and the inside of the four edges 1b serves as an adsorption/opening surface for the ferromagnetic plate 3, and a hole 4a communicating with the hole 1a is provided on the side facing the magnetic pole. The ferromagnetic plate 4 is buried, and the hole 1a has a long diameter d in one direction, and the diameter d° in the direction perpendicular to this is close to the diameter of the ferromagnetic protrusion 3a. The adhesion position of the male tool B consisting of the ferromagnetic protrusion 3a and the ferromagnetic protrusion 3a is regulated by the convex edge 1b, and the male tool B consists of the ferromagnetic plate 2 having the ferromagnetic protrusion 2a and the permanent magnet l, and is attracted and engaged without shifting. However, even if a force is applied to tilt the male tool B with respect to the attraction surface and remove the attraction from the female tool A, the gap between the ferromagnetic protrusion 3a and the hole edge, and between the ferromagnetic plate 3 and the convex edge 1b Since there is an extremely small gap between the two, there is almost no tilting, and even a small amount of tilting causes little change in the adsorption force, so when the force disappears, it returns to its original state and the adsorption does not come off.However, if the diameter d perpendicular to this direction If the ferromagnetic plate 3 is tilted in the direction, the gap between the ferromagnetic protrusion 3a and the hole edge is large, and the protrusion 3a can be tilted, so even if the ferromagnetic plate 3 and the convex edge 1b are engaged, the restraining force is small and it is relatively easy. Therefore, by installing the lid so that the short diameter d° of the hole 1a is in the direction in which the lid tilts when the lid of a bag or the like is opened, the lid will be securely closed. The lid will not open accidentally due to some kind of force.

In addition, since the ferromagnetic plate 4 is located close to the magnetic pole, all the lines of magnetic force of the magnetic pole are concentrated on this ferromagnetic plate 4, and the ferromagnetic protrusion 3a
The lines of magnetic force are easily focused, which improves the adsorption efficiency, and the lines of magnetic force leaking to the outside from the part of the permanent magnet l located on the outer surface side of the ferromagnetic plate 4 are extremely weak, so it is necessary to cover them with a non-magnetic case. It will be close to the state it was in.

Therefore, even if the magnetic recording object contacts the side facing the magnetic pole, the four edges
A magnetic gap is formed between the magnetic poles and the magnetic poles by b, so that no adverse effects such as magnetic disturbances are caused.

Furthermore, there is no need for a case to cover and hold the permanent magnet and ferromagnetic plate of the female tool A together, and there is no need for fitting the female tool A into the case, so the cost is reduced accordingly.

[Brief explanation of drawings]

FIG. 1 is a sectional view taken in mutually orthogonal cross sections of an embodiment of the fastener according to the present invention, FIG. 3 is a plan view of the female fitting, FIG.
FIG. 5 is a sectional view of various other embodiments of the stop, FIGS. 6 to 12 are sectional views of various embodiments of the leg member, and FIG. 13 is a sectional view of a conventional example. 1... Permanent magnet, 1a... Hole, 1b... Four edges, 2
．． 3...Ferromagnetic plate, 2a, 3a...Ferromagnetic protrusion, 4
...Ferromagnetic plate, 5... Leg member, d, d'... Diameter,
a, b...Magnetic pole surface, A...Female tool, B...Male tool.

Claims (1)

[Claims] A ferromagnetic plate 2 is attached to the magnetic pole face a of a permanent magnet 1, which has a hole 1a extending from one magnetic pole face a to the other magnetic pole face b. Magnetic plate 2
The ferromagnetic protrusions 3a and 2a protruding from both sides of the
Alternatively, a ferromagnetic protrusion 3a protruding from the ferromagnetic plate 3 is a stop that is detachably attracted to the ferromagnetic plate 2, and the permanent magnet 1 has a convex edge 1b on the periphery of the magnetic pole face b. A ferromagnetic plate 4 is buried therein, which is integrally provided with a circumferential strip, and has a recessed surface for attracting the ferromagnetic plate 3 inside the convex edge 1b, and has a hole 4a communicating with the hole 1a on the magnetic pole surface b side. and the hole 1a
has a long diameter d in one direction and a diameter d in a direction perpendicular to this
A fastener characterized in that ' has a diameter close to the diameter of the ferromagnetic protrusion 3a.