JPH0423892Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to a switchable permanent magnet holding device that holds or is held by a magnetic material, and in particular, a permanent magnet that is rotatably disposed within a magnetic circuit block. The present invention relates to a permanent magnet holding device that selectively switches a magnetic attraction surface between an energized state and a non-excited state by rotating it around its axis.

(Prior art) As one of this type of permanent magnet holding device, for example, Japanese Utility Model Application Publication No. 59-57468, Japanese Utility Model Application No. 57-104503
As described in the publication, a knob is fitted to one end of a rod-shaped permanent magnet that is rotatably housed in the inner cavity of a magnetic circuit block, and the knob is used to rotate the permanent magnet around its axis. There is something that rotates the angle.

However, this type of conventional permanent magnet holding device
Since the length dimension of the permanent magnet is larger than its diameter dimension, when the permanent magnet is rotated, the permanent magnet breaks, and as a result, fragments of the permanent magnet accommodate the permanent magnet and the permanent magnet. The permanent magnet is often sandwiched between the inner surface of the inner cavity and the inner surface of the inner cavity, making it impossible to rotate.

In particular, in the case of a permanent magnet holding device for attraction as described in Japanese Utility Model Application Publication No. 59-57468, the length of the permanent magnet is increased in order to obtain a large attraction force. The magnet tends to break in the middle of its length. Further, in the permanent magnet holding device in which a groove or a protrusion is formed on one end surface of the permanent magnet, and the knob is fitted into the groove or the protrusion, the permanent magnet is broken at a portion where the knob is fitted. There are many things to do.

As mentioned above, the permanent magnet is damaged while the magnetic attraction surface is energized, and the fragments are caught between the permanent magnet and the inner surface of the inner cavity, so that the permanent magnet becomes unable to rotate. In this case, the permanent magnet holding device and the magnetic body cannot be separated, and therefore not only the permanent magnet holding device but also the magnetic body must be destroyed or disassembled.

(Purpose of the invention) The present invention provides that even if a permanent magnet for selectively switching a magnetic attraction surface between an energized state and a de-energized state is damaged, its fragments will be removed from the permanent magnet and the magnetic block in which the permanent magnet is received. It is an object of the present invention to provide a switchable permanent magnet holding device that is not caught between the two.

(Structure of the Invention) The switchable permanent magnet holding device of the present invention includes a magnetic circuit block including a pair of magnetic members each having a magnetic attraction surface and a non-magnetic member disposed between the magnetic members, and a magnetic circuit block including a non-magnetic member disposed between the magnetic members. The block includes a permanent magnet rotatably disposed within the block, and an operating mechanism that rotates the permanent magnet to selectively switch the magnetic attraction surface between an energized state and a de-energized state, and the outer circumferential surface of the permanent magnet is coated. surrounded by wood.

(Effects of the invention) According to the invention, since the permanent magnet is surrounded by the covering material, even if the permanent magnet is damaged, the fragments will remain between the permanent magnet and the magnetic circuit block housed therein. You won't be caught in the middle.

(Example) Hereinafter, an example of the present invention shown in the drawings will be described.

FIGS. 1 and 2 show an embodiment of a permanent magnet holding device 10 that includes two types of permanent magnets, such as a hanging magnet device. Permanent magnet holding device 10
includes a magnetic circuit block 12, a fixed permanent magnet 14 housed within the magnetic circuit block 12, and a switching permanent magnet 16 housed within the magnetic circuit block 12.

The magnetic circuit block 12 includes a plate-shaped non-magnetic member 18 extending in the vertical direction, and a pair of thick plate-shaped magnetic members 20 that are butted against each other with the non-magnetic member 18 in between. The magnetic circuit block 12 has a groove 22 that opens upward and in both left and right directions;
A lumen 24 is formed that opens in both left and right directions. The groove 22 and the lumen 24 extend parallel to each other in the left-right direction in the upper and lower parts of the center of the magnetic circuit block 12.
It has a cross-sectional shape extending from the magnetic member 18 to the other magnetic member 20 via the non-magnetic member 18. As shown in FIG. 2, the lower portions of the opposing inner surfaces of both the magnetic members 20 have widened recesses 26 extending in the horizontal direction.
It is inclined so as to define the lower end surface of. Further, the lower end surfaces of both magnetic members 20 constitute a magnetic attraction surface 28 for attracting a magnetic body.

The upper groove 22 has a rectangular cross-sectional shape. In the groove 22, the permanent magnet 14, which has a rectangular cross-sectional shape, is arranged so as not to be rotatable or movable. The fixed permanent magnet 14 is made of a low coercive force magnet such as an alnico magnet or a high coercive force magnet such as a ferrite magnet, and both magnetic members 20
The magnetic poles are arranged so that opposite sides thereof are different magnetic pole surfaces (N, S). The fixed permanent magnet 14 and the groove 22 may have other cross-sectional shapes such as a circular shape.

The lower lumen 24 has a circular cross-sectional shape. Inside the inner cavity 24, the rod-shaped permanent magnet 16 having an outer diameter slightly smaller than the inner diameter of the inner cavity 24 is arranged so as to be rotatable about its axis. The switching permanent magnet 16 is made of a high coercive force magnet, such as a ferrite magnet, and is magnetized in the diametrical direction and has different magnetic pole faces (N, S) on opposing outer circumferential surfaces. In the illustrated example, the permanent magnet 16 for switching has a slight chamfering process on the opposing outer peripheral surface in a direction perpendicular to the magnetization direction, but a cross section of the center circle that is not chamfered. It may be a shaped magnet. Permanent magnet 16 for switching
Alternatively, a low coercive force magnet such as an alnico magnet may be used.

The switching permanent magnet 16 may have a total magnetic energy product equal to that of the fixed permanent magnet 14, but in order to make demagnetization easier, It is preferable to use one having a small total magnetic energy product.

A protrusion 32 is provided at one end of the switching permanent magnet 16 to be fitted with an operating knob 30 for rotating the permanent magnet 16 around its axis. Further, the switching permanent magnet 16 is provided with a cover 34 that is tightly attached to the outer surface of the switching permanent magnet 16 so as to surround the entire outer surface thereof. Although the cover 34 is made of a non-magnetic metal material such as stainless steel or a resin material in the illustrated example, it may be a film made of a magnetic metal material such as steel if the thickness dimension is small.

The left and right openings of groove 22 and lumen 24 are closed by end plates 36 attached to magnetic circuit block 12 by a plurality of screws. Operation knob 3
0 handle portion 38 extends out of the lumen 24 through a hole in one end plate 36.

The upper opening of the groove 22 is closed by a thin plate-shaped shorting member 40 made of a magnetic material. A plate-shaped holding member 42 made of a non-magnetic material is stacked on the short-circuiting member 40 . The short-circuiting member 40 and the holding member 42 are fixed to the magnetic circuit block 12 with a plurality of bolts. A hanging member is provided on the holding member 42 for hanging the magnetic fixing device 10 from a hanging machine such as a crane. A flange portion 46 of the metal fitting 44 is attached with a plurality of bolts.

When in use, the permanent magnet 1 for switching is connected to the operation knob 30.
As a result, the first rotational position shown in Fig. 2 and this
and a second rotational position rotated by 180 degrees.

When the switching permanent magnet 16 is in the first rotational position shown in FIG. 2, the permanent magnet 16 rotates so that the magnetic pole of the switching permanent magnet 16 is on the same polar side as that of the fixed permanent magnet 14 Because it is done, that is,
Since the permanent magnet 16 is rotated so that the same magnetic pole faces of both permanent magnets 14 and 16 are on the same magnetic member 20 side, the magnetic flux of the same magnetic pole faces of both permanent magnets 14 and 16 is mainly caused by the magnetic flux of both magnetic members 20. It passes through the suction surface 28. Therefore, at this time, the magnetic attraction surface 28 is in an excited state, and a magnetic body can be attracted to the magnetic attraction surface 28.

On the other hand, when the permanent magnet 16 for switching is rotated to the second position, the magnetization direction of the permanent magnet 16 is reversed to that of the fixed permanent magnet 14. Since the magnetic pole faces are magnetically connected to different magnetic pole faces of the fixed permanent magnet 14 by the magnetic member 20, both permanent magnets 14,1
The magnetic flux of 6 is connected to the magnetic circuit block 12 and both permanent magnets 1.
4 and 16 through a closed circuit formed inside. Therefore, the magnetic attraction surfaces 28 of both magnetic members 20 are brought into a non-excited state, and the magnetic body attracted to the magnetic attraction surfaces 28 is released from the permanent magnet holding device 10.

When the switching permanent magnet 16 is rotated to the second position, the shorting member 40
As described in the publication, the total magnetic energy product of the permanent magnet 16 for switching is fixed.
4, both permanent magnets 14,1
It acts as a bypass path for correcting the magnetic imbalance caused by 6, and as a result, the magnetic attraction surface 28 is completely placed in the non-excited image body.

According to the permanent magnet holding device 10, since the entire outer surface of the switchable permanent magnet 16 is surrounded by the cover 34, even if the switchable permanent magnet 16 is damaged, its fragments will not be scattered. Debris is prevented from becoming trapped between the switching permanent magnet 16 and the inner surface of the lumen 24, such that even if the switching permanent magnet 16 is rotated from the 121st to the second position or vice versa. The permanent magnet holding device 10 can be used continuously.

In the permanent magnet holding device 50 shown in FIG. 3, the switching permanent magnet 16 is surrounded by a cap 52 made of a metal material such as stainless steel on the outer surface of the end on the operating knob 30 side, and the other outer surface is surrounded by a cap 52 made of a metal material such as stainless steel. is surrounded by a cover 54 made of synthetic resin. Also, the fourth
In the permanent magnet holding device 60 shown in the figure, the permanent magnet 16 for switching has its entire outer surface surrounded by a cover 64 made of synthetic resin, and also has its end on the operation knob 30 side connected to the end. It is reinforced by a mated cap 62 of a metallic material such as stainless steel. For this reason, the permanent magnet holding device 5
According to No. 0 and No. 60, the fitting portion between the permanent magnet 16 and the operation knob 30 is reinforced by the caps 52 and 56, so even if the permanent magnet 16 has a large length, damage at the fitting portion is prevented. It can be prevented.

In addition, in both of the permanent magnet holding devices 50 and 56 shown in FIGS. 3 and 4, the inner cavity 24 is
Preferably, the inner cavity has a step between a portion that receives the caps 52, 54 and a portion that receives the covers 54, 34. In this way, the rotation of the permanent magnet 16 for switching becomes smooth.

FIGS. 5 and 6 show one embodiment of a permanent magnet holding device 70 that includes only permanent magnets for switching, such as a magnetic base. The permanent magnet holding device 70 includes a magnetic circuit block 72 and a switching permanent magnet 74 housed in the magnetic circuit block 72.
including.

The magnetic circuit block 72 includes a plate-shaped non-magnetic member 76 that extends in the vertical direction, and a pair of thick plate-shaped magnetic members 78 that are butted against each other with the non-magnetic member 76 in between. Non-magnetic member 76 and both magnetic members 7
8 are mutually bonded to each other by a bonding material such as a brazing material.

The magnetic circuit block 72 is formed with a bore 80 extending in the left-right direction from the center of the magnetic circuit block 72 and opening at both ends of the magnetic circuit block 72 in the left-right direction. The inner cavity 80 is connected to one of the magnetic members 7
8 to the other magnetic member 78 via the non-magnetic member 76
It has a circular cross-sectional shape. Both magnetic members 7
The lower portions of the opposing inner surfaces of the nonmagnetic member 76 are inclined so as to define, together with the lower end surface of the non-magnetic member 76, a widening, laterally extending recess 82, as shown in FIG. Further, the lower end surfaces of both magnetic members 78 constitute a magnetic attraction surface 84 for attracting a magnetic body.

A rod-shaped permanent magnet 74 having an outer diameter slightly smaller than the inner diameter of the inner cavity is disposed within the inner cavity 80 so as to be rotatable about its axis. permanent magnet 7
No. 4 is magnetized in the diametrical direction and has different magnetic pole surfaces (N, S) on opposing outer peripheral surfaces. The permanent magnet 74 is
A slight chamfering process is applied to the opposing outer circumferential surfaces in the direction perpendicular to the magnetization direction.

One end of the permanent magnet 74 is provided with a protrusion 88 that engages with an operating knob 86 to rotate the permanent magnet about its axis. Further, the permanent magnet 74 is provided with a cover 90 that is tightly attached to the outer surface of the permanent magnet 74 so as to surround the entire outer surface of the permanent magnet 74 . The cover 90 is made of a non-magnetic metal material such as stainless steel or a resin material, or a film of a magnetic metal material such as steel.

The left and right openings of the lumen 80 are formed by end plates 9 attached to the magnetic circuit block 72 by multiple twists.
2 is closed. A handle portion 94 of the operating knob 86 extends out of the lumen 80 through a hole in one end plate 92 .

In use, the permanent magnet 74 is moved between the first rotational position shown in FIG.
and a second rotational position, which is rotated by degrees.

When the permanent magnet 74 is in the first rotational position shown in FIG.
The magnetic flux No. 4 passes through the magnetic attraction surfaces 84 of both magnetic members 78. Therefore, at this time, the magnetic attraction surface 84 is in an excited state, and the magnetic attraction surface 84 can be held by a magnetic body such as a surface plate.

On the other hand, when the permanent magnet 74 is rotated to the second position, both magnetic pole faces of the permanent magnet 74 commonly contact both magnetic members 78, so that the magnetic flux of the permanent magnet 74 is transferred to each magnetic member 78 and the permanent magnet 74. A closed circuit is formed with the magnet 74. Therefore, both magnetic members 78
The magnetically attracting surface 84 becomes a non-excited state, and the magnetically attracting surface 84 can be released from the magnetic material.

Also in the permanent magnet holding device 70, since the entire outer surface of the permanent magnet 74 is surrounded by the cover 90,
Even if the permanent magnet 74 is damaged, its fragments will not scatter,
The debris is therefore prevented from becoming trapped between the permanent magnet 74 and the inner surface of the bore 80.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing an embodiment of the permanent magnet holding device of the present invention, Fig. 2 is a sectional view taken along line 2-2 in Fig. 1, and Fig. 3 is a permanent magnet of the present invention. FIG. 4 is a vertical cross-sectional view showing another embodiment of the permanent magnet holding device of the present invention, and FIG. 5 is a longitudinal cross-sectional view showing still another embodiment of the permanent magnet holding device of the present invention. FIG. 6 is a vertical cross-sectional view showing an embodiment of
FIG. 6 is a cross-sectional view taken along line 6-6 in the figure. 12, 72...Magnetic circuit block, 16, 74
...Switching permanent magnet, 18,76...Non-magnetic member, 20,78...Magnetic member, 24,80...Inner cavity, 28,84...Magnetic attraction surface, 30...Operation knob, 34,54 , 90... cover, 52, 62...
...cap.

Claims (1)

[Claims for Utility Model Registration] (1) A magnetic circuit block comprising a pair of magnetic members each having a magnetic attraction surface and a magnetically expelling member disposed between the magnetic members, and a rotatable magnetic circuit block within the magnetic circuit block. permanent magnets arranged,
an operating mechanism for rotating the permanent magnet to selectively switch the magnetic attraction surface between an energized state and a de-energized state, the outer peripheral surface of the permanent magnet being surrounded by a covering material, a switchable permanent magnet holder; Device. (2) The permanent magnet holding device according to claim 1, wherein the covering material includes a metal or resin cover coated on the outer surface of the permanent magnet. (3) The permanent magnet is a bar-shaped magnet, the operating mechanism includes an operating knob fitted to one end of the permanent magnet, and the covering material includes a cover coated on an outer surface of the permanent magnet and a Utility model registration claim 1 or 2, which includes a cap fitted to the end of the permanent magnet on the side of the operating knob.
Permanent magnet holding device described in paragraph (2). (4) The magnetic circuit block includes a fixed permanent magnet disposed between the magnetic members. A permanent magnet holding device according to claim 1, 2, or 3 of the utility model registration claim.