JPH0444114Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a magnetic fastener used as a fastener for handbags and other bags, and as a fastener for clothes, etc. Used in the fields of using, manufacturing, and selling things.

(Prior Art) Hitherto, latches using permanent magnets have been used as fasteners on the lids and body parts of bags such as handbags and bags, and as fasteners in place of buttons on clothing.

Various structures have been proposed and put into practical use for this magnetic holder, but these include a ferromagnetic plate that is in contact with both magnetic poles of a permanent magnet, and a ferromagnetic bar that is implanted in one of the ferromagnetic plates. The fixed side is configured with the tip portion flush with the surface of the other ferromagnetic plate, while the movable side is configured of a ferromagnetic material that can be attached to and detached from the tip side of the ferromagnetic rod and the surface of the ferromagnetic plate at the same time. Magnetic latches are known (for example, Utility Model Application No. 56-65070, Utility Model Application No. 56-149416).

(Problem to be Solved by the Invention) In the above-mentioned magnetic holder, the ferromagnetic rod on the fixed side and the surface of the ferromagnetic plate which is flush with the tip surface of the ferromagnetic rod, the ferromagnetic rod on the movable side. When the ferromagnetic material comes into contact with the permanent magnet, the magnetic path of the magnetic flux emitted from the permanent magnet is completely completed by the member made of the ferromagnetic material, and as a result, a strong attraction force can be obtained. However, if a flush relationship between the tip end surface of the ferromagnetic rod and the surface of the ferromagnetic plate cannot be obtained, for example, if one side of the tip end surface of the ferromagnetic rod comes into contact with the ferromagnetic material on the movable side, However, even if the magnetic path was completed, the cross-sectional area of the magnetic path was small, so there was a problem in that the obtained attraction force was also small.

The above-mentioned flush relationship can be obtained by accurately controlling the length of the ferromagnetic rod and the thickness of the permanent magnet and ferromagnetic plate, but since there are limits to machining accuracy, manufacturing This inevitably led to the creation of weaker products.

(Means for solving the problem) However, the magnetic holder of this invention has ferromagnetic plates in contact with both magnetic poles of a permanent magnet, respectively, and a ferromagnetic bar embedded in one of the ferromagnetic plates. A ferromagnetic rod having a fixed side whose tip end surface is flush with the surface of the other ferromagnetic plate, and a flat surface that is simultaneously attached to and detached from the tip end surface of the ferromagnetic rod and the surface of the other ferromagnetic plate. The permanent magnet and the ferromagnetic plate on the fixed side are housed in a case made of a non-magnetic material, and the tip of the ferromagnetic rod and the surface of the other ferromagnetic plate are arranged in a direction perpendicular to each surface. In order to enable relative movement, an elastic material is interposed between the case and the other ferromagnetic plate and/or at the movable implanted part of the ferromagnetic rod.

The relative movement between the tip of the ferromagnetic rod and the surface of the ferromagnetic plate is extremely small, which cannot be covered by the machining accuracy of each part (for example, if the machining accuracy is 5/100, the moving distance is 2/10). It is fine as long as it is possible within a small range.

(Function) According to the magnetic hook of this invention, it is possible to make the tip end face of the ferromagnetic rod and the surface of the ferromagnetic plate exactly flush when the ferromagnetic body on the movable side is attracted. can.

(Example) An example of this invention will be described below with reference to the drawings. In FIG. 1, A is the fixed side and B is the movable side. On the fixed side A, a circular iron plate 2 is provided on the lower side (N pole or S pole) of the annular permanent magnet 1, and an annular iron plate 3 is provided on the upper side (S pole or N pole). It is housed in a case 4 made of brass. The case 4 has a structure in which an annular flange 4b is connected to the inside of the upper end of the outer cylindrical wall 4a, and an inner cylindrical wall 4c is connected to the lower side of the inner edge of the annular flange 4b. Claw pieces 5 provided at several locations are hooked to the lower peripheral edge of the iron plate 2. The lower edge of the inner cylindrical wall 4c faces the upper surface of the iron plate 3 with a slight gap therebetween, and a rubber annular elastic body 6 is mounted between the annular collar 4b and the iron plate 3. The permanent magnet 1 is integrally movable within the case 4 in a direction along the inner and outer cylinder walls 4a and 4c. An iron rod 7 is installed in the center of the iron plate 2, and faces the center hole 9 of the iron plate 3 through the center hole 8 of the permanent magnet 1, so that the tip end surface 7a of the iron rod 7 and the surface 3a of the iron plate 3 are connected to each other. It is almost flush.
The implanted part of the iron rod 7 is a shaft part 10 connected to the lower end.
is inserted into the hole 11 of the iron plate 2, and also inserted into the hole 13 of the U-shaped leg piece 12 attached to the lower surface of the iron plate 2, and by caulking the tip of the shaft part 10,
The leg piece 12 is also fixed at the same time as the iron rod 7 is installed.

On the movable side B, a disk (magnetic material or non-magnetic material) having the same diameter as the outer diameter of the case 4 is attached to an iron core bar 14 having a diameter that can be inserted into and removed from the inside of the inner cylinder wall 4c of the case 4.
15 and the U-shaped leg piece 16 are stacked one on top of the other, and the shaft part 17 protruding from the center upper side of the iron core metal 14 is passed through the disc 15 and the leg piece 16 and swaged to form an integral structure. The thickness of the iron core metal 14 is such that when the disc 15 comes into contact with the annular collar 4b of the case 4,
The thickness is such that the lower surface of the iron core metal 14 comes into contact with the surface 3a of the iron plate 3 and the tip end surface 7a of the iron rod 7, which are configured flush.

In the above, making the length of the iron rod 7 and the total thickness of the iron plate 3 and the permanent magnet 1 the same,
The condition is that the surface 3a and the tip surface 7a are flush with each other, but in consideration of errors in machining accuracy, the length of the iron bar 7 is set to a positive tolerance (for example, +0.05), and the thickness of the iron plate 3 and permanent magnet 1 is adjusted. Set the value to be a negative tolerance (for example, -0.05).

In the above embodiment, the iron core bar 14 on the movable side B
into the inner cylinder wall 4c of the case 4 on the fixed side A,
If the lower surface of the iron core 14 is brought into contact with the surface 3a of the iron plate 3 and the upper end surface 7a of the iron rod 7, the iron plates 2, 3,
A magnetic path is completed by the iron core bar 14 and the iron rod 7, and the movable side B is strongly attracted to the fixed side A. There are irregularities between the surface 3a of the iron plate 3 and the upper end surface 7a of the iron rod 7 within the error range of the work precision (the iron plate 3 side is lower),
When the iron core bar 14 on the movable side is brought into contact, the iron plate 3 side compresses the annular elastic body 6 and moves very slightly to come into close contact with the iron core bar 14, ensuring a sufficient magnetic path cross-sectional area. can. In this case, the amount of movement of the iron plate 3 side is important and is 0.15 mm. However, if the iron plate 3 side easily moves even with a small external force, the movable side that has been attracted will easily come off, which is undesirable. It is also necessary to take this point into consideration when selecting a relatively hard material. Note that the annular elastic body 6 is not limited to rubber, but may also be a coil spring or a plate spring in which elastic pieces are punched out at several locations on the periphery of an annular metal plate.

In the embodiment shown in FIG. 2, the iron bar 7 side is movable. That is, when planting the base of the iron rod 7 on the iron plate 2, a rubber elastic body 18 is sandwiched between the iron plate 2 and the leg piece 12 to form a movable planting part.

In this case, the iron bar 7 has a negative tolerance, while the iron plate 3 and the permanent magnet 1 have a positive tolerance.

In this embodiment, when the sugar side B is adsorbed to the fixed side A, the iron rod 7 compresses the elastic body 18 and the movable side B
The upper end surface 7a and the surface 3a of the iron plate 3 become flush with each other, and come into contact with the iron core bar 14 on the movable side B.

FIG. 3 shows the elastic body 18 of the embodiment shown in FIG.
2, and in this case as well, the iron rod 7 is attracted while being moved to the movable side B, as described above.

In FIG. 4, the position of the elastic body 18 has been further changed, and it is sandwiched between the iron rod 7 and the iron plate 2.

In this case, the iron rod 7 has a plus tolerance, while the permanent magnet 1 and the iron plate 3 have a minus tolerance.

When adsorbing the movable side B, the iron rod 7 compresses the elastic body 18 and moves toward the iron plate 2, so that the upper end surface 7a and the surface 3a of the iron plate 3 are exactly flush with each other, as in each of the above embodiments. Therefore, the iron core bar 14 on the movable side B is attached to this part.
comes into contact with it and attracts it.

In each of the above embodiments, a magnetic holder in which the iron bar 7 is placed at the center of the permanent magnet 1 has been described. Next, FIGS. I will explain.

In the embodiment shown in FIG. 5, a hole 28 is formed on one side of a disk-shaped permanent magnet 21, a disk-shaped iron plate 22 is provided at the lower magnetic pole of the permanent magnet 21, and a disk-shaped iron plate 22 is provided at the upper magnetic pole. An iron plate 23 is provided, a rubber elastic body 26 is arranged above the iron plate 23, and these are housed in a brass case 24 to constitute the fixed side A.
An iron rod 27 installed on one side of the iron plate 22 is passed through the hole 28 of the permanent magnet 21, with the inner end of the iron rod 27 facing a hole 29 formed on one side of the iron plate 23.
and the upper end surface 27a of the iron bar 27 and the surface 2 of the iron plate 23.
3a is on one side. In the planting part of the iron rod 27,
Similar to the previous embodiment, a U-shaped leg piece 32 is fixed. Further, on one side of the case 24, an inner cylinder wall 24c is formed in correspondence with the hole 29 through which the iron rod 27 is exposed, and an insertion portion for the movable side B is formed. The movable side B includes an iron core bar 34, a disc 35, and a leg piece 36.
The iron core bar 34 is fixed to one side of a disc 35 in a biased manner.

In this embodiment, the machining accuracy of the iron bar 27, the permanent magnet 21, and the iron plate 23 are set in the same relationship as shown in FIG. .

The situation when the movable side B is attracted to the fixed side A is also the same as in the embodiment in FIG.
side moves very slightly in the direction of movable side B, and the iron bar 2
The upper end surface 27a of 7 and the surface 23a of the iron rod 23 are exactly flush with each other, and the iron core bar 34 on the movable side B is adsorbed thereon.

In FIGS. 6 to 8, the iron rod 27 is made movable, and a rubber elastic plate 3 is interposed between the movable planting part at the base of the iron rod 27. The relationship between the position of the elastic plate 38 and the machining accuracy of the parts is the same as in the previous embodiment, and FIG. 6 corresponds to FIG. 2, FIG. 7 corresponds to FIG. 3, and FIG. 8 corresponds to FIG. 4. are doing.

Although the above various embodiments have been described with respect to a magnetic hook having a circular outer shape, the outer shape can be similarly implemented with a rectangular, polygonal, or elliptical shape, and it can also be implemented with the iron bar positioned outside the permanent magnet. can do.

(Effect of the invention) As explained above, according to this invention, the upper end surface of the ferromagnetic rod and the surface of the ferromagnetic plate constituting the attraction surface can be accurately and effortlessly aligned by deforming the elastic body. Therefore, when the movable side is attracted, a magnetic path can be formed with a sufficient cross-sectional area.
It has the effect of achieving strong adsorption power. Furthermore, during manufacturing, it is possible to eliminate the occurrence of defective products and improve yield. effective.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of this invention, FIG. 2 is a sectional view of an embodiment that forms the embodiment of FIG. 1,
3 and 4 are partial sectional views, FIG. 5 is a sectional view of another embodiment of this invention, and FIGS. 6 to 8 are examples of modified embodiments of the embodiment of FIG. 5. FIG. 1, 21...Permanent magnet, 2, 3, 22, 23...
...Iron plate, 4,24...Case, 6,26...Elastic body, 7,27...Iron rod, 14.34...Iron core bar, 18,38...Elastic plate.

Claims (1)

[Scope of utility model registration request] Ferromagnetic plates are brought into contact with both magnetic poles of a permanent magnet, respectively, and the tip end surface of a ferromagnetic rod implanted in one ferromagnetic plate is flush with the surface of the other ferromagnetic plate to constitute a fixed side, while the above-mentioned The movable side is made of a ferromagnetic material having a flat surface that is simultaneously attached to and detached from the tip surface of the ferromagnetic rod and the surface of the other ferromagnetic plate, and the permanent magnet and the ferromagnetic plate on the fixed side are made of a non-magnetic material. In order to allow the tip surface of the ferromagnetic rod and the surface of the other ferromagnetic plate to move relative to each other in a direction perpendicular to each surface, a space between the case and the other ferromagnetic plate and A magnetic latching device characterized in that/or an elastic material is interposed in the movable implanted portion of the ferromagnetic rod.