JPH081658U - Magnetic hook - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a magnetic hooking device capable of quickly adsorbing the hooking device side to the main body side and without scratching the surface of the main body side cover. A first ferromagnetic plate 2 is provided on one magnetic pole of a permanent magnet plate 1, and is integrated with a nonmagnetic material cover 3 that directly covers the other magnetic pole of the permanent magnet plate 1. A second ferromagnetic plate 15 is detachably provided on the other magnetic pole side of the magnet plate 1, and a ferromagnetic protrusion 16 projecting in the center of the second ferromagnetic plate 15 is provided on the permanent magnet plate 1 and the cover 3. Through the holes 5 and 6 formed at the center, the first ferromagnetic plate 1 or the ferromagnetic protrusion 8 protruding from the first ferromagnetic plate 1 can be separated and contacted, and the permanent magnet plate 1 and the cover 3 have a second On the side where the ferromagnetic plate 15 is attached and detached, the funnel-shaped part 5
a, 6a are provided, and annular flat portions 5b, 3a that are parallel to the magnetic pole surface on the side of the first ferromagnetic plate are provided on the outside thereof.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a magnetic hooking device that uses the attractive force of a permanent magnet.

[0002]

[Prior art]

 Conventionally, a first ferromagnetic plate is provided on one magnetic pole of a permanent magnet plate, and is integrated with a cover made of a non-magnetic material that covers the other magnetic pole of the permanent magnet plate. A second ferromagnetic plate is detachably provided on the side, and the ferromagnetic protrusions projecting from the second ferromagnetic plate pass through holes formed in the permanent magnet plate and the cover, and the first strong magnetic plate. Alternatively, magnetic hooks that can be brought into and out of contact with ferromagnetic protrusions protruding from the ferromagnetic plate are known and widely used as hooks for bags such as handbags and bags, and accessories such as clothes and belts. Has reached the end.

[0003]

[Problems to be solved by devising]

 When the magnetic hook as described above is used for a handbag, for example, the permanent magnet side is attached to the body side of the handbag while the second ferromagnetic plate side is attached to the lid piece side. When attracting the ferromagnetic plate of the permanent magnet to the permanent magnet side, the ferromagnetic protrusion protruding from the second strong magnetic plate first covers the outer peripheral edge of the permanent magnet and the intermediate portion of the hole edge of the hole. Adsorbed on the outer surface. This is because the magnetic flux density in the intermediate portion between the outer peripheral edge and the hole edge is the highest in the state before the second ferromagnetic plate is attracted. Then, from such an adsorbed state, the ferromagnetic protrusions protruding from the second ferromagnetic plate are made to protrude into the holes formed in the permanent magnet plate and the cover, so that the first ferromagnetic plate side is adsorbed. In the process, the second ferromagnetic plate easily rotates around the ferromagnetic protrusion at the position corresponding to the outer peripheral edge of the permanent magnet and the intermediate portion of the hole edge on the outer surface of the cover, and from this position to the hole edge, The ferromagnetic protrusion rarely slides linearly and often slides in a zigzag shape, which causes a problem that many sliding contact scratches are formed on the outer surface of the cover.

This sliding contact damages the value of handbags and other products to which magnetic hooks are attached, and at the time of display for sale, a protective seal is attached to the outer surface of the cover or a mesh is attached to the outer surface of the cover. It was necessary to add measures such as patterns to make the sliding scratches less noticeable.

A magnetic latching device having a structure in which the entire magnetic pole surface of the permanent magnet plate on the side to which the second ferromagnetic plate is attached and detached is a concave curved surface and the entire upper surface of the cover is also along this concave curved surface is proposed. (For example, the magnetic hook shown in FIG. 10 of Japanese Utility Model Laid-Open No. 55-52807). According to the magnetic hook of such a structure, the sliding of the ferromagnetic protrusions projecting from the second ferromagnetic plate on the cover surface is guided by the concave curved surface to minimize it. It can be expected to reduce sliding scratches. However, in the magnetic hook having such a structure, the concave curved surface of the permanent magnet plate is not suitable for grinding or polishing to obtain the dimensional accuracy of the permanent magnet, and the assembling accuracy cannot be obtained. There was a problem that the yield of products was reduced, such as the occurrence of weak magnetic hooks.

Therefore, instead of forming the magnetic pole surface of the permanent magnet plate into a concave curved surface, a strong curved surface is formed on the peripheral edge side of the central hole on the upper surface of the permanent magnet plate having a central hole and flat upper and lower surfaces. Attempts have also been made to superimpose a yoke made of magnetic material and mount a cover having a concave curved surface on the peripheral edge side of the central hole corresponding to the shape of the upper surface of the yoke to integrate them, but the number of parts is increasing. However, as the number of parts increases, the dimensional error of the parts is weighted, and the problem remains that assembly accuracy cannot be obtained.

Japanese Unexamined Patent Publication No. 62-95808, which is one of the inventions relating to the magnetic hook, points on the upper surface of the permanent magnet plate 1 having a central hole 1a and flat upper and lower surfaces, in the direction of the central hole 1a. The magnetic shield plate 5 made of a ferromagnetic material having an inclined surface 5b whose peripheral portion is gradually thin is superposed, and the case 4 is also provided with a magnetic hooking device having a structure along the inclined surface 5b of the magnetic shield plate 5. is suggesting. In this Japanese Patent Laid-Open No. 62-95808, when the flat magnetic shield plate 5 is superposed on the upper surface of the permanent magnet plate 1, if the magnetic shield plate 5 is thickened so that magnetic leakage hardly occurs, the hook side is attracted. There is a problem in that the magnetic force decreases and the attraction force also decreases. On the other hand, in view of the problem that the magnetic shield effect decreases when the magnetic shield plate 5 is made thin, the upper magnetic pole of the permanent magnet plate 1 is considered. The purpose of this was to propose a magnetic hooking device that is equipped with a magnetic shield measure that suppresses the leakage of magnetism from the surface and also prevents the force of attracting and holding the hooking side 3 from decreasing. Therefore, although the invention to be solved is different from the present invention, the permanent magnet plate has a central hole and flat upper and lower surfaces instead of the concave surface of the permanent magnet plate described above. It can be considered as one of the attempts to superimpose a yoke made of a ferromagnetic material having a concave curved surface on the peripheral edge side of the central hole on the upper surface of the plate. However, when the structure of JP-A-62-95808 is adopted, as described above, not only the number of parts increases, but also the dimensional error of parts increases as the number of parts increases. There has been a problem that the assembly accuracy cannot be obtained. Also, in the structure of this Japanese Patent Laid-Open No. 62-95808, not only the cover 4 but also the magnetic shield plate 5 is provided between the upper magnetic pole surface of the permanent magnet plate 1 and the second ferromagnetic plate 3 on the hanging side. Therefore, it was unavoidable that the force of sucking the hanging tool side decreased and the suction force also decreased. Particularly, when it is an essential requirement to interpose the magnetic shield plate 5 between the upper magnetic pole surface of the permanent magnet plate 1 and the cover 4, the presence of the magnetic shield plate 5 reduces the amount of the permanent magnet plate 1. The volume will decrease. Therefore, in order to secure the volume of the permanent magnet plate 1 required to obtain a predetermined attraction force by the magnetic force of the permanent magnet plate 1, the volume of the main body side must be increased, while the volume of the main body side is increased. However, there is a problem in that the volume of the permanent magnet plate 1 must be reduced by the amount of the magnetic shield plate 5 at the sacrifice of the decrease in the magnetic attraction force to a certain extent. It was

[0008]

[Means for solving the problem]

 In view of this, the present invention proposes that the main magnet side permanent magnet plate having the central hole has a funnel-shaped central hole edge portion of the upper magnetic pole surface and an annular flat portion whose outer peripheral portion is parallel to the lower magnetic pole surface. Also, in order to correspond to the shape of the permanent magnet plate, the edge of the central hole is formed into a funnel shape and the outer peripheral portion thereof has an annular flat portion, and the cover is directly capped on the permanent magnet plate, so that the above-mentioned problems occur. Is solved.

That is, the magnetic latch of the present invention is a cover made of a non-magnetic material in which the first ferromagnetic plate is provided on one magnetic pole of the permanent magnet plate and directly covers the other magnetic pole of the permanent magnet plate. A second ferromagnetic plate is detachably provided on the other magnetic pole side of the permanent magnet plate, and the ferromagnetic protrusion protruding in the center of the second ferromagnetic plate is integrated with the permanent magnet plate. And a ferromagnetic protrusion protruding from the first ferromagnetic plate or a ferromagnetic protrusion protruding from the first ferromagnetic plate through a hole formed in the center of the cover, and the permanent magnet plate and the cover have a second strong magnetic field. A funnel-shaped portion is provided at the edge of the hole on the side where the plate is attached and detached, and an annular flat portion parallel to the magnetic pole surface on the side of the first ferromagnetic plate is provided outside the funnel-shaped portion. It is a special feature.

The second ferromagnetic plate may be in the form of a flat plate, but it is also possible to project the central part corresponding to the funnel-shaped part of the permanent magnet plate and the cover, and provide the ferromagnetic projection on the projected part.

[0011]

[Action]

 According to the magnetic latch of the present invention, when the second ferromagnetic plate is to be attracted to the permanent magnet plate side, the ferromagnetic protrusions protruding from the second ferromagnetic plate first move to the permanent magnet plate. Since it is adsorbed to the outer surface of the cover at a position corresponding to the intermediate portion between the peripheral edge and the hole edge, subsequently, the ferromagnetic protrusion is slid along the outer surface of the cover formed in a funnel shape, and the cover and It suffices to make it penetrate into the hole of the permanent magnet plate. As a result, the distance that the ferromagnetic protrusion contacts the outer surface of the cover and slides is minimized because it is guided linearly toward the hole in the funnel-shaped portion, and sliding contact damage can be reduced. .

In order to exert the above-mentioned effect, the magnetic latch of the present invention has a funnel-shaped hole edge portion of the upper magnetic pole surface of the main body side permanent magnet plate having the central hole and an outer peripheral portion thereof. An annular flat portion parallel to the lower magnetic pole surface is used. A cover having a funnel-shaped central hole edge and an annular flat outer peripheral portion corresponding to the shape of the upper magnetic pole surface of the permanent magnet plate is used. A structure is adopted in which the upper magnetic pole surface of the permanent magnet plate is directly capped.

By adopting such a shape of the permanent magnet plate itself, a structure is adopted in which only the cover has a funnel-shaped central hole edge and an annular flat portion on the outer peripheral part while adopting a flat permanent magnet plate on both upper and lower surfaces. In this case, for example, another member must be superposed on the upper surface of the flat permanent magnet plate, increasing the number of parts and lowering the assembly accuracy, or between the upper surface of the flat permanent magnet plate and the cover. It is possible to prevent the inconvenience that an air gap exists in the magnetic field and reduce the magnetic attraction force, and to obtain a strong attraction force. Moreover, by adopting a structure in which the shape of the cover is made to correspond to the shape of the upper magnetic pole surface of the permanent magnet plate and the upper magnetic pole surface of the permanent magnet plate is directly capped, the ferromagnetic plate on the hook side and the body side It is possible to obtain a stronger attractive force by eliminating the excess or deficiency in the contact of the permanent magnet plate and the contact between the ferromagnetic protrusions or between the ferromagnetic protrusion and the strong magnetic plate on the main body side, and by accurately contacting each other. .

[0014]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view of the embodiment, and FIG. 2 is a sectional view of the embodiment in a suction state.

In the figure, A is the main body side having the permanent magnet plate 1, and B is the hanging tool side. On the main body side A, a disk-shaped first ferromagnetic plate (iron plate) 2 is brought into contact with the lower magnetic pole of a disk-shaped permanent magnet plate 1, and the permanent magnet plate 1 and the first ferromagnetic plate 2 are topped cylinders. The cover 3 made of a non-magnetic material is capped to directly cover the upper magnetic poles of the permanent magnet plate 1, and the claw pieces 4 and 4 provided on the lower end edge of the tubular portion of the cover 3 are placed inside. It is bent and integrated.

A hole 5 is provided in the center of the permanent magnet plate 1, an upper hole edge portion of the hole 5 is a funnel-shaped portion 5a, and an outer side thereof is an annular flat portion 5b. The cover 3 is also provided with a hole 6 in the central portion of the flat portion 3a of the top plate so as to match the hole 5, and an inner cylinder 7 is connected to the hole 6, and the edge of the hole 6 is the funnel. The funnel-shaped portion 6a is formed so as to match the shape-shaped portion 5a.

A ferromagnetic protrusion 8 having a diameter slightly smaller than the diameter of the hole 5 of the permanent magnet plate 1 and approximately half the thickness of the permanent magnet plate 1 is provided above the center of the first ferromagnetic plate 2. There is. A rod 9 is continuously provided at the center of the lower surface of the ferromagnetic protrusion 8 so that it can be inserted into a through hole 10 formed at the center of the first ferromagnetic plate 2. The rod 9 projecting from the lower surface can be fitted with a through hole 14 formed in the base plate 12 of the fixing tool 13 which is a gate type of the leg pieces 11 and 11 and the base plate 12. The fixing tool 13 is fixed to the lower surface of the first ferromagnetic plate 2 by compressing and deforming the end portion of the rod 9.

On the other hand, the hanging tool side B is composed of a second ferromagnetic plate 15 in the form of a disk, a ferromagnetic protrusion 16, and a fixing tool 13. The second ferromagnetic plate 15 has the same diameter as that of the first ferromagnetic plate 2, and the central portion is formed on the flat portion 3a of the cover 3 and the funnel-shaped portion 6a inside the flat portion 3a. A protruding portion 15a is formed downward so as to be able to abut without a gap. A rod 18 connected to the upper side of the strong magnetic protrusion 16 is inserted into a through hole 17 formed in the center of the lower surface of the protrusion 15a, and the protrusion of the rod 18 is formed through the substrate 12 of the fixture 13. The hole 14 is fitted and the end portion of the rod 18 is compressed and deformed to be integrated as a whole.

It goes without saying that the first ferromagnetic plate 2 and the ferromagnetic protrusions 8 and the second ferromagnetic plate 15 and the ferromagnetic protrusions 16 may be integrally formed.

In the above-described embodiment, the second ferromagnetic plate 15 on the hanging side B is in contact with the top plate of the cover 3 on the main body side A as shown in FIG. As a result of the magnetic force lines coming out of the magnetic poles concentrating on the ferromagnetic projections 8 and 16 that abut in the hole 5 of the permanent magnet plate 1, the body side A and the hanging side B are stopped by a strong attraction force. The paths of the lines of magnetic force are from the magnetic pole on the lower surface of the permanent magnet plate 1 to the ferromagnetic protrusion 8 via the ferromagnetic plate 2, and from the magnetic pole on the upper surface of the permanent magnet plate 1 to the ferromagnetic protrusion 16 via the ferromagnetic plate 15. It is composed of a route and. If there is an air gap in the contact portion between the ferromagnetic protrusions 8 and 16 or in the portion where the ferromagnetic plate 15 contacts the magnetic pole of the permanent magnet plate 1 through the cover 3, the attraction force is weakened.

When the hanging tool side B is attracted to the main body side A, the ferromagnetic projection 16 on the hanging tool side B rarely smoothly penetrates into the hole 6, and as shown in FIG. In the flat portion 3a of the cover 3 that constitutes the side A, it is often adsorbed to the intermediate portion between the outer peripheral edge and the hole 6. This is because the magnetic flux density in this portion is the highest on the top plate. Therefore, in order to push the ferromagnetic protrusion 16 into the hole 6, it is necessary to slide the attracted ferromagnetic protrusion 16 on the top plate toward the hole 6, but this sliding range is the funnel-shaped portion 6a. Therefore, the ferromagnetic protrusion 16 is linearly guided toward the hole 6 by the inclined surface of the funnel-shaped portion 6a. As a result, the sliding distance becomes the shortest, the entry into the hole 6 can be made smooth, and the sliding contact damage can be reduced.

Next, in order to exert a strong attraction force when the hanging tool side B is attracted to the main body side A, the two ferromagnetic protrusions 8 and 16 do not interpose an air gap, It is necessary that the second ferromagnetic plate 15 on the hook side B surely abuts on the top plate of the cover 3 on the main body side A without interposing an air gap. Therefore, at the manufacturing stage, it is necessary to precisely process the dimensional accuracy of the thickness of the permanent magnet plate 1 and the thickness of the ferromagnetic protrusions 8 and 16. In this respect, the permanent magnet plate 1 has a flat annular shape, and only the hole edge portion of the hole 5 in the central portion is the funnel-shaped portion 5a, and the annular flat portion 5b is provided on the outer side thereof. The surface of the flat portion 5b parallel to the contacting magnetic pole surface can be ground or polished, whereby a member having high dimensional accuracy can be obtained. Therefore, the contact between the strong magnetic projections 8 and 16 and the contact between the second ferromagnetic plate 15 and the top plate of the cover 3 can be ensured without excess or deficiency, and a strong suction force can be secured as a hook. it can.

Further, as a result of the downwardly projecting portion 15a being formed in the central portion of the second ferromagnetic plate 15, a concave portion 15b is formed on the upper side surface of the second ferromagnetic plate 15 correspondingly. The recessed portion 15b also has the following effects.

That is, the hanging tool side B is fixed to, for example, the lid piece 19 of the handbag as shown in FIG. 4 by folding the leg pieces 11 of the fixing tool 13.

In this case, since the fixing tool 13 including the folded leg pieces 11, 11 can be partly accommodated in the recessed portion 15b, the outer skin (or the outer skin) contacting the outside by that amount can be accommodated. The protrusion of the cloth 19a can be reduced, and the appearance of the handbag can be prevented from being impaired.

It should be noted that the fixing tool 13 includes a bag-like metal fitting 20 and a plunging fitting 21 as shown in FIG. 5, or a receiving fitting 22 and a plunging fitting 23 as shown in FIG. It is also possible to configure it, and also in these cases, a part of the fastener can be accommodated in the recessed portion 15b to reduce the protrusion of the outer skin 19a.

Next, FIG. 7 shows a cross section of another embodiment of the present invention. In this embodiment, the central portion of the second ferromagnetic plate 24 on the hanging tool side B is flat without forming the protrusion 15a as in the previous embodiment. The members other than the second ferromagnetic plate 24 are the same as those in the above-mentioned embodiment, and the reference numerals are the same.

In this embodiment, since the recessed portion is not formed on the upper side of the second ferromagnetic plate 24, the effect of reducing the protrusion of the mounting portion by the fastener 13 cannot be obtained, but the second The action and effect that can reduce the sliding contact damage due to the sliding of the ferromagnetic protrusions 16 provided on the ferromagnetic plate 24 and the dimensional accuracy of the members can be enhanced, and the action and effect that the strong suction force can be secured are the same as those in the above-described embodiment. It is the same.

[0030]

[Effect of device]

 As described above, according to the present invention, a funnel-shaped portion is formed on the upper surface of the permanent magnet plate that constitutes the main body side and the hole edge of the central hole of the cover, and the funnel-shaped portion is formed on the outside of the funnel-shaped portion. Since parallel annular flat parts are formed, there is an effect that sliding contact damage due to sliding of the ferromagnetic protrusions on the hook side can be reduced, and the need to attach a protective seal to the top plate of the cover can be eliminated. At the same time, there is an effect that the suction operation to the main body side on the latch side can be performed quickly.

Further, in the magnetic latch of the present invention, in the permanent magnet plate on the main body side having the central hole, the hole edge portion of the upper magnetic pole surface is made into a funnel shape, and the outer peripheral portion is made the lower magnetic pole surface. Since the annular flat parts are parallel to each other, the thickness of the permanent magnet plate can be secured to high dimensional accuracy by grinding or polishing, the manufacturing yield can be improved, and the overall assembly accuracy can be maintained high. it can.

Further, the cover also has a funnel-shaped central hole edge portion corresponding to the shape of the permanent magnet plate, and an outer peripheral portion thereof has an annular flat portion shape, and the cover has an upper magnetic pole of the main body-side permanent magnet plate. Since it is directly capped on the surface, it is possible to secure the necessary volume of the permanent magnet while keeping the overall size of the main body relatively small, and to obtain a strong attractive force. When the permanent magnet plate and the cover have the above-described shapes, a flat permanent magnet plate is used for both the upper and lower surfaces while only the cover has a funnel-shaped central hole edge and an annular flat portion on the outer peripheral portion. Inconvenience that arises, for example, the number of parts increases and the dimensional error is added because other members must be superposed on the flat upper surface of the permanent magnet plate, which lowers the assembly accuracy, or It is possible to prevent inconveniences such as the presence of an air gap between the cover and the magnetic attraction force being reduced.

According to the magnetic hook of the present invention, both the permanent magnet plate and the cover have a funnel-shaped central hole edge, and the outer peripheral portion is an annular flat portion parallel to the lower magnetic pole surface of the permanent magnet plate. Therefore, when the second ferromagnetic plate on the hanging tool side has a flat shape, it can accurately contact the annular flat portion without excess or deficiency. Therefore, the entire upper magnetic pole surface and the entire cover of the permanent magnet plate on the main body side having the central hole have a concave curved surface shape, and the hanging tool side has a convex curved surface on the lower side corresponding to these shapes. Compared with the conventional magnetic latch, the contact between the ferromagnetic plate on the latch side and the permanent magnet plate and the contact between the ferromagnetic protrusions or between the strong magnetic protrusion and the ferromagnetic plate on the main body is eliminated. , It is possible to obtain a stronger suction force by making accurate contact with each other.

Further, when the second strong magnetic plate on the hooking side is projected so as to correspond to the funnel-shaped portion of the permanent magnet plate and the cover, and the ferromagnetic projection is provided on the projecting portion, it hooks with the main body side. Due to the mutual shape with the tool side, tighter and more reliable engagement is possible, and further, part of the fastener on the hook side can be accommodated in the recessed portion provided by the formation of the protrusion, This has the effect of reducing the protrusion of the attachment part due to the fastener.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an embodiment of the present invention.

FIG. 2 is a cross-sectional view of an embodiment of the present invention in a suction state.

FIG. 3 is a cross-sectional view for explaining a state during suction of the embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a mounting structure on the hanging tool side according to the embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a mounting structure of an embodiment in which the fixing device has another structure.

FIG. 6 is a cross-sectional view showing a mounting structure of an embodiment in which the fixing device has still another structure.

FIG. 7 is a cross-sectional view of another embodiment of the present invention in a suction state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Permanent magnet plate 2 1st ferromagnetic plate 3 Cover 3a, 5b Flat part 5 Hole 5a Funnel-shaped part 6 Hole 6a Funnel-shaped part 8, 16 Ferromagnetic protrusion 13 Fixing device 15, 24 Second ferromagnetic plate 15a Projection Department

Claims (2)

[Scope of utility model registration request] 1. A permanent magnet plate is provided with a first ferromagnetic plate on one magnetic pole, and is integrated with a cover made of a non-magnetic material that directly covers the other magnetic pole of the permanent magnet plate. A second ferromagnetic plate is detachably provided on the other magnetic pole side of the plate, and a ferromagnetic protrusion projecting at the center of the second ferromagnetic plate is provided.
The permanent magnet plate and the cover can be separated from and brought into contact with the first ferromagnetic plate or a ferromagnetic protrusion protruding from the ferromagnetic plate through a hole formed in the center of the permanent magnet plate and the cover. On the side where the ferromagnetic plate is attached and detached, a funnel-shaped portion is provided at the edge of the hole, and an annular flat portion parallel to the magnetic pole surface on the side of the first ferromagnetic plate is provided outside the funnel-shaped portion. Magnetic hook which is characterized by being 2. The second ferromagnetic plate according to claim 1, wherein a central portion of the second ferromagnetic plate is projected so as to correspond to the funnel-shaped portion of the permanent magnet plate and the cover, and the ferromagnetic protrusion is provided on the projected portion. Magnetic hook.