JP2016036626A - magnet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology that prevents a magnet from sliding with respect to an attracted surface without increasing attraction force of the magnet.SOLUTION: A magnet structure comprises a magnet body 300 attached to a base 100, and an elastic body 400. The magnet body 300 comprises a flat attracting surface 310. The elastic body 400 is flat and comprises a pressing surface 430 located at a position protruding from the attracting surface 310. When an attracted surface X is attracted to the attracting surface 310 of the magnet body 300, the elastic body 400 is crushed between the attracting surface 310 and the attracted surface X, and is flush with the attracting surface 310. Even if the sliding of the magnetic structure with respect to the attracted surface X is attempted, adhesion friction, hystericis loss friction, and plowing friction are generated between the elastic body 400 and the attracted surface X, thereby suppressing the slide of the magnetic structure.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a magnet.

Magnets that can be attracted to metal or magnets by magnetic force have been known since ancient times. Magnets are used in various situations. For example, magnets are used for detachable fixing to a surface to be attracted, which is a flat surface made of metal such as iron that can be attracted by magnets.
One specific example is a magnet clip. The magnet clip can sandwich a magnet and a predetermined object (an example of the object is a paper on which some content is handwritten or printed) by a spring force fixed to the magnet. And a clip attached to the magnet. The magnet clip has a function of detachably fixing the object to the attracted surface by using the magnet while attracting the magnet to the attracted surface in a state where the object is sandwiched between the clips.

  The magnet clip allows the object to be detachably fixed to the attracted surface on which a thumbtack or the like cannot be driven via the magnet clip. Further, the fixing to the detachable suction surface basically does not damage the suction surface. Because of such advantages, magnet clips are very popular.

However, if the weight of the object is heavier than a certain level, the magnet clip's magnet attracting force on the attracted surface is insufficient, and the magnet clip attracted to the attracted surface moves in the direction in which the force works (generally gravity The situation occurs that the robot slides in the downward direction (where it works).
In order to prevent such a situation, the magnet included in the magnet clip may be made an anisotropic magnet to increase the magnetic force of the magnet. However, a magnet having a large magnetic force is generally very expensive and cannot be adopted for a product in a field where the price competition is intense such as a magnet clip.

In addition to a magnet clip with a clip attached to a magnet, a magnet box with a box for storing a predetermined object attached to a magnet, or a predetermined object on a magnet There are magnet hooks and the like to which hooks for locking are attached. Even in these cases, when the weight of the object increases, a phenomenon occurs in which the magnet slides with respect to the attracted surface.
That is, the technology that makes it possible to increase the force at which the magnet starts to slide relative to the attracted surface without increasing the attracting force of the magnet is of great value.
However, no such technology is known so far.

  The present invention is a technology that increases the force at which the magnet starts to slide against the attracted surface without increasing the attracting force of the magnet, that is, the magnet does not increase the attracting force of the magnet. It is an object of the present invention to provide a technique that makes it difficult to slip.

As an invention for solving the above-mentioned problems, the present inventor proposes the following invention.
The present invention has a magnetic body having an attractive surface that is a flat surface that is scheduled to be attracted to a surface to be attracted that has a property of being attracted to a magnetic force. And is disposed in the vicinity of the attracting surface, protrudes from a plane including the attracting surface of the magnet body, and when the attracting surface is attracted to the attracted surface, the attracted surface A magnet structure including an elastic body having elasticity and having a protruding portion that is crushed when pressed by a surface.
The magnet structure of the present application has a magnetic body having a magnetic force having a flat attracting surface. The magnet structure of the present application has an elastic body in addition to the magnet body. The elastic body has a protruding portion protruding from a plane including the attracting surface of the magnet body. The elastic body has elasticity, and when the suction surface is attracted to the attracted surface, the above-described protruding portion is pressed against the attracted surface and is crushed.
This magnet structure is used by being attracted to the surface to be attracted by the attracting force due to the magnetic force of the magnet body in the same manner as using a normal magnet. When the attracting surface of the magnet body is attracted to the attracted surface, more precisely, the protruding portion of the elastic body is pressed against the attracted surface, thereby compressing the elastic body.
When a force parallel to the plane is applied to an object placed on a plane, a frictional force is generated between the plane and the object, as is well known. When both the plane and the object are hard objects such as metal, the friction force acting between them is called an adhesion friction force according to Coulomb's law. On the other hand, when the object is an elastic body such as rubber, a deformation loss friction force and a digging friction force work between the plane and the object. Roughly speaking, the deformation loss frictional force and the digging frictional force are frictional forces generated by the elastic body entering the minute irregularities existing on the surface of the plane, and the larger the elasticity of the elastic body, the larger the frictional force. Become. This magnet structure suppresses slipping on the attracted surface by using a deformation loss friction force and a digging friction force having a mechanism different from that of the adhesion friction force as the friction force. In addition, if the magnetic force of the magnet body is the same as that of a normal magnet, the magnet structure is more difficult to slip on the attracted surface, and the difficulty of slipping on the attracted surface is the same as that of the conventional magnet. If present, the magnetic force of the magnet body may be weaker than that of a conventional magnet.
In other words, this magnet structure is designed to make it difficult to slip with respect to the surface to be attracted without increasing the attracting force due to the magnetic force of the magnet body.

The magnet body of the present invention has a flat attracting surface. The adsorption surface only needs to have a plane that rides on the same plane, and as long as it is divided, it may be divided into a plurality of parts, or may have a recess or a hole in a part thereof. For example, the magnet body may be fixed to the main body as will be described later. However, even if a concave portion or a hole is provided on the adsorption surface of the magnet body for the fixation, the adsorption surface is prevented from being flat. Absent.
The term “adsorption” in the present application does not necessarily mean that the attracting surface of the magnet body is in contact with the attracted surface, but the attracting surface of the magnet body and the attracted surface are close to each other. Alternatively, it includes a state in which the magnet body is detachably fixed to the attracting surface with a slight gap. Some types of magnets, for example, have a concave part that has its edge on a flat surface, for example, a magnet body fitted into a concave part of a metal case, but the entire magnet is completely fitted in the concave part. The suction surface, which is a flat surface, is positioned slightly behind the above-described flat surface on which the edge of the concave portion is placed. In such a magnet, in the state where the magnet or the magnet body is attracted to the attracting surface, the edge of the recess contacts the attracted surface, but the attracting surface of the magnet body does not contact the attracted surface. However, even if the attracting surface of the magnet body does not contact the attracted surface, the magnet body is fixed to the attracted surface. Such a configuration is typically found in a magnet body of a conventional magnet clip.
Further, in the present invention, the protruding portion of the elastic body protrudes from the plane including the attracting surface of the magnet body when the attracting surface of the magnet body is attracted to the attracted surface while being kept parallel to the attracted surface. It means that the protruding portion of the elastic body comes into contact with the attracted surface earlier than the attracting surface of the magnet body. As long as it is configured as such, the shape of the protrusion is not questioned.

The elasticity of the elastic body is such that the protruding part of the elastic body is attracted when the attracting surface of the magnet body is attracted to the attracted surface to such an extent that the attracting surface of the magnet body is not prevented from adsorbing to the attracted surface. It should be elastic enough to be crushed by the surface. That is, it is better that the elastic body is soft to such an extent.
Further, as described above, the greater the elasticity of the elastic body, the harder the magnet structure slides against the attracted surface. The elastic body may have a Young's modulus smaller than 40 MPa, for example. If the elastic body has such an elastic modulus, a magnet structure in which a general-purpose magnet body and an elastic body are combined can provide a sufficient anti-slip effect on the attracted surface.
When the elastic body is rubber, the elasticity of the elastic body can be in a range where the hardness is less than 70 degrees Hs. The above-mentioned condition that the Young's modulus is smaller than 40 MPa is substantially synonymous with the fact that the hardness is smaller than Hs 70 degrees when the elastic body is rubber. By making the elastic body have elasticity in this range, a non-slip effect on the attracted surface can be sufficiently obtained with a magnet structure in which a general-purpose magnet body and an elastic body are combined.

The material of the elastic body, whether natural or synthetic, can be rubber, or can be a resin such as PVC (polyvinyl chloride), or can be silicone. . Techniques for changing the elasticity of any of the materials have been established, and the elasticity of the elastic body can be set within an appropriate range for obtaining the effects of the present invention using these techniques.
Further, the elastic body can be formed in a sponge shape regardless of the material. By adopting the sponge-like structure, it is possible to appropriately change the elasticity of the elastic body, and it can be expected that the slippage with respect to the surface to be adsorbed increases due to the fine irregularities of the elastic body.

As described above, the magnet structure of the present invention includes a magnet body and an elastic body. The magnet body and the elastic body may be fixed to a main body that fixes them together. Thereby, the relative positional relationship between the magnet body and the elastic body can be maintained in a desired state.
When the magnet structure includes a main body, the main body may include a hole having an annular edge that rides on a virtual plane that is a virtual plane. In this case, the magnet body and the elastic body are such that the attracting surface, which is a flat surface, coincides with the virtual surface or is positioned slightly rearward from the virtual surface, and the protruding portion protrudes from the virtual surface. Thus, it may be fitted in the hole. By fitting an elastic body into the hole of the main body, it becomes possible to avoid the side surface of the elastic body from becoming dirty or damaged, and it has been conventionally used to fit a magnet into the hole of the main body. Since it is a technique, manufacture of a magnet structure does not become difficult. In general, the “hole” often means a bottomed hole, but the “hole” in this case includes a hole without a bottom. Moreover, the hole may be partially open on its side. When a part of the hole is opened, the edge does not exist in a part where a part of the side surface of the hole is opened. That is, the edge of the present invention does not necessarily have an endless annular shape.
When the attracting surface of the magnet coincides with the virtual surface, when the attracting surface is attracted to the attracted surface, the attracted surface and the attracting surface come into contact, and the attracting surface of the magnet is positioned slightly behind the virtual surface. In this case, when the suction surface is attracted to the attracted surface, the attracted surface and the attracted surface do not come into contact (in general, when the attracted surface is attracted to the attracted surface, the distance between the two is 0. 5mm inside and outside.)
How to fix the magnet body and the elastic body to the main body can be appropriately selected. The magnet can be fixed to the main body by, for example, screwing or bonding. The elastic body can be fixed to the main body by, for example, adhesion. In addition, a concave portion is provided on one of the main body and the elastic body, and a convex portion is provided on the other of the main body and the elastic body, and the elastic body is attached to the main body by engaging the convex portion with the concave portion. It is also possible to adopt a configuration in which is fixedly attached. In this way, since the bonding step can be omitted, the manufacturing cost of the magnet structure can be suppressed.

  Although there is no restriction | limiting in particular in the shape of the elastic body of the magnet structure of this application, and the protrusion part with which it is provided, The said protrusion part of the said elastic body has a press surface which is a plane parallel to the said adsorption surface. Also good. The cohesive friction force according to Coulomb's law increases in proportion to the force that the object exerts on the plane, and is not affected by the apparent area where the object contacts the plane. The frictional force increases in proportion to both the force exerted by the object on the plane and the apparent area where the object contacts the plane, so that the magnet structure can be obtained by bringing the pressing surface of the protrusion into contact with the attracted surface. When adsorb | sucking to a to-be-adsorbed surface, a deformation | transformation loss frictional force and a digging frictional force can be enlarged now. Of course, this means that the magnet structure is less likely to slip with respect to the attracted surface.

When the protruding portion of the elastic body has a pressing surface, the pressing surface may protrude from the attracting surface of the magnet body in the following range. In the case of the following example, the pressing surface of the elastic body is basically the same as the attracting surface if the attracting surface comes into contact with the attracted surface when the attracting surface of the magnet body is attracted to the attracted surface. If the suction surface does not come into contact with the suction target surface, the suction surface is substantially flush with the suction surface.
For example, the pressing surface may recede more than 0.2 mm when the attracting surface of the magnet body is attracted to the attracted surface. According to the experimental results of the magnetic structure prototype made by the inventor of the present application, if the pressing surface does not collapse so much when the attracting surface is attracted to the attracted surface, the anti-slip effect Is not fully demonstrated.
The pressing surface may recede in a range larger than 0.2 mm and smaller than 2 mm when the attracting surface of the magnet body is attracted to the attracted surface. If the elastic member is made to retract more than 2 mm when the attracting surface of the magnet body is attracted to the attracted surface, the elastic body is made a considerably soft material or the magnetic force of the magnet body is considerably increased. If both or both are not adopted, it is difficult to make the suction surface and the pressing surface flush with each other, and it becomes difficult to sufficiently exhibit the anti-slip effect. Making the elastic body too soft tends to cause problems in strength and durability, and increasing the magnetic force of the magnet body tends to cause cost problems.
The pressing surface may recede in a range larger than 0.2 mm and smaller than 2 mm when the attracting surface of the magnet body is attracted to the attracted surface. According to the experimental result of the prototype of the magnet structure performed by the inventor of the present application, the anti-slip effect was sufficiently exhibited when the pressing surface satisfies this condition.

The elastic body has a thickness that is 4% or more smaller when the suction surface is attracted to the attracted surface than when the attracting surface is not attracted to the attracted surface. It may be. If the elastic body becomes so thin when the attracting surface of the magnet body is attracted to the attracted surface, the anti-slip effect is sufficiently exhibited.
Alternatively, the elastic body has a thickness of 8% or more smaller when the suction surface is attracted to the attracted surface than when the attracting surface is not attracted to the attracted surface. It may be like this. If it does in this way, the effect of anti-slip will be exhibited better.

The elastic body is disposed in the vicinity of the magnet body, but its position can be determined as appropriate.
The elastic body may be provided on the rear side with respect to the magnet body in a sliding direction, which is a direction in which the magnet structure is scheduled to slide when the attracting surface is attracted to the attracted surface. When the elastic body is disposed at this position, the anti-slip effect is exhibited better than when the elastic body is provided at another position.
The elastic body may be a long member whose longitudinal direction is a direction orthogonal to the sliding direction. If it does in this way, it will become easy to prevent rotating so that an elastic body may incline with respect to a sliding direction, and it will become easy to acquire the effect of anti-slip.
When the elastic body includes a pressing surface, at least one groove may be provided on the pressing surface of the elastic body. By providing the groove on the pressing surface of the elastic body, the groove acts like a sucker when the pressing surface of the elastic body is pressed against the attracted surface, and the effect of preventing slipping is more exhibited.
The above-mentioned groove may be perpendicular to the above-mentioned sliding direction, and by doing so, the effect of preventing slipping can be obtained better. That is, the pressing surface has at least one in a direction orthogonal to a sliding direction, which is a direction in which the magnet structure is scheduled to slide when the attracting surface is attracted to the attracted surface. A groove may be provided.

  The attracting surface of the magnet body and the protrusion of the elastic body may not overlap when viewed from the attracted surface side during use. Since the magnet's attracting force decreases in proportion to the cube of the distance, even if the thickness is not large, if the elastic body overlaps the attracting surface of the magnet body, the attracted surface by the attracting surface of the magnet body Adsorption to the surface is weakened. By adopting the above-described configuration, the attracting surface of the magnet body is firmly attracted to the attracted surface, so that the elastic body can be reliably pressed against the attracted surface. This leads to the slip of the magnet structure attracted to the attracted surface.

The main body may be provided with either a clip that can hold a predetermined object, a box that can store the predetermined object, or a hook that can lock the predetermined object. good.
A magnet structure having a clip becomes a magnet clip. The magnet structure having a box becomes a so-called magnet box in which a box containing documents and small items can be detachably attached to the surface to be attracted, and the magnet structure having a hook hangs clothes and paintings with the hook. This is a so-called magnet hook that can be detachably attached to the attracted surface. But the use of the magnet structure of this application is not restricted to this.

(A) of the magnet clip by 1st Embodiment is a perspective view which shows the state which looked at the magnet clip from the left front upper side, (b) is a perspective view which shows the state which looked at the magnet clip from the left rear upper side, (c) ) Is a perspective view showing a state in which the magnet clip is viewed from the lower left rear side. In the magnet clip shown in FIG. 1, (a-1) is a plan view of the magnet clip, (a-2) is a left side view of the magnet clip, and (b-1) is A- in FIG. A sectional view, (b-2) is a BB sectional view in FIG. A-1, and (b-3) is a CC sectional view in FIG. A-1. The disassembled perspective view of the magnet clip shown in FIG. The side view which shows the use condition of a part of magnet clip shown in FIG. The front view which shows the use condition of a part of magnet clip shown in FIG. The table | surface which shows an experimental result. The table | surface which shows an experimental result. The table | surface which shows an experimental result. Table and graph showing experimental results. (A) of the magnet hook by 2nd Embodiment is a perspective view, (b) is a rear view, (c) is a sectional side view. The perspective view of the magnet box by 3rd Embodiment.

Hereinafter, preferred first to third embodiments of the magnet structure of the present invention will be described in detail with reference to the drawings.
In addition, in each embodiment, the overlapping code | symbol shall be attached | subjected to the object which overlaps, and the overlapping description shall be abbreviate | omitted depending on the case.
In addition, all of the magnet clips, magnet hooks, and magnet boxes shown in the following embodiments are basically used by being detachably fixed to a surface to be attracted that is vertical. However, a magnet structure included in a magnet clip, a magnet hook, and a magnet box described below is used by being detachably fixed to a suction surface other than a vertical surface, for example, a suction surface that is a horizontal surface. It may be a thing.

<< First Embodiment >>
In the first embodiment, a magnet clip will be described. The magnet clip is used by being detachably attached to an attracted surface that is a flat surface that can be attracted by magnetic force in a state where an object to be sandwiched such as paper is sandwiched. The magnet clip according to this embodiment can basically use the conventional magnet clip configuration as it is. The magnet clip of this embodiment is different from a conventional magnet clip in that it includes an elastic body described later and a structure for attaching the elastic body to a base described later.
Hereinafter, the structure of the magnet clip will be described with reference to FIGS.
1A is a perspective view showing a state in which the magnet clip is viewed from the upper left front side, FIG. 1B is a perspective view showing the state in which the magnet clip is viewed from the upper left rear side, and FIG. It is a perspective view which shows the state which looked at the clip from the left back lower side.
2, (a-1) is a plan view of the magnet clip, (a-2) is a left side view of the magnet clip, (b-1) is a cross-sectional view along AA in FIG. b-2) is a BB sectional view in FIG. a-1, and (b-3) is a CC sectional view in FIG. a-1.
FIG. 3 is an exploded perspective view of the magnet clip.

The magnet clip includes a base 100 and a handle 200. As will be described later, the base 100 is adsorbed to the surface to be adsorbed, and sandwiches an object with the handle 200.
Although not limited to this, the magnet clip of this embodiment is made of metal except for a magnet body and an elastic body, which will be described later.

The base 100 is made of a metal plate. The base 100 includes a rectangular base plate 110. A fixing hole 111 is formed in the approximate center of the base plate 110 (FIG. 3). The fixing hole 111 is a circular hole, and the inner peripheral surface thereof is threaded. A first locking hole 112, which is a hole, is formed behind the base plate 110. The first locking hole 112 is not necessarily limited to this, but is a circular hole.
Side plates 120 bent in the bottom direction are connected to the left and right sides of the base plate 110. The height of the side plates 120 in the vertical direction in FIG. 1 is constant in all the portions in the front-rear direction. A back plate 130 bent in the bottom direction is connected to the rear side of the base plate 110. The height of the back plate 130 in the up-down direction in FIG. 1 is constant in all portions in the left-right direction, and is equal to the height of the side plate 120 in the up-down direction in FIG.
On the side connecting the base plate 110 and the back plate 130, a second locking hole 131 that is a hole is formed so as to straddle them.
On the bottom surface side of the base plate 110, a space surrounded by the base plate 110, the side surface plates 120, and the back plate 130 is formed. This space is a “hole” of the main body referred to in the present application, and the lower ends in FIG. 1 of the side plates 120 and the back plate 130 are “edges” of the holes. The lower ends in FIG. 1 of the side plates 120 and the back plate 130 corresponding to the edge of the hole ride in common on a plane parallel to the base plate 110. This plane is a virtual plane as used in the present application.
However, by providing the base plate 110 with a front plate having the same shape as the back plate 130 that has the inner surface along the front side of the magnet body 300, the above-described “edge” can be formed into an annular shape.

Although not limited to this, both sides of the upper surface of the base plate 110 in FIG. 1 in the width direction are supported by cutting a part of the base plate 110 into a substantially U shape and starting up. Each part 113 is provided. The support 113 is for attaching the handle 200 to the base 100.
Although not limited to this, a support hole 113A that is a circular hole is provided in an upper portion of the support portion 113 in FIG.

The magnet body 300 and the elastic body 400 are fixedly fitted in the above-mentioned space formed on the bottom surface side of the base plate 110 and corresponding to the hole referred to in the present application.
The magnet body 300 is a magnet. The magnet body 300 has a thin rectangular parallelepiped shape, in other words, a plate shape. The width of the magnet body 300 in the left-right direction is substantially equal to or slightly smaller than the interval between the side surface plates 120. In addition, the length of the magnet body 300 in the front-rear direction is somewhat smaller than the length of the base plate 110 in the front-rear direction. Further, the thickness of the magnet body 300 in the vertical direction in FIG. 1 is equal to the height of the side plates 120 and the back plate 130 in the vertical direction in FIG. The lower plane in FIG. 1 of the magnet body 300 is an attracting surface referred to in the present application, which is a surface that is scheduled to be fixed to the attracted surface.
Near the center of the magnet body 300, a magnet hole 320 that is a through hole having a circular cross section is formed (FIG. 3). The magnet hole 320 is provided at a position corresponding to the fixing hole 111 provided in the base plate 110. The magnet body 300 has a screw 330 (FIG. 3) having the same diameter as that of the magnet hole 320 penetrating the magnet hole 320 and screwed into the fixing hole 111 to be tightened. It is fixedly attached to the base plate 110 by being sandwiched between the base plate 110. The fixed range of the magnet hole 320 on the side of the attracting surface 310 is large enough to accommodate the head 331 of the screw 330, so that the head 331 of the screw 330 is closer to the attracting surface 310 than FIG. It is designed not to protrude to the lower side.
The method for fixing the magnet body 300 to the base plate 110 is not limited to this. For example, the magnet body 300 can be fixed to the base plate 110 by bonding.
The magnet body 300 attached to the base plate 110 is in a state in which both ends in the left and right width directions are substantially in contact with the inner side surfaces of the both side surface plates 120, and there is some gap between the back surface and the back surface plate 130. It is supposed to be free.
The attracting surface 310 of the magnet body 300 fixed to the base plate 110 is in a state coincident with the above-described virtual surface. However, the suction surface 310 may not coincide with the virtual surface, and is slightly (for example, 0.5 mm inside or outside, more specifically 0.2 mm to 0.00 mm) on the rear side (upper side in FIG. 1) of the virtual surface. 7mm) may be retracted.

The elastic body 400 has elasticity. The elasticity of the elastic body 400 is such that when the attracting surface 310 of the magnet body 300 is attracted to the attracted surface as described later, a portion protruding from the virtual surface of the elastic body 400 is pressed against the attracted surface. It is said that it will be crushed. Preferably, the elasticity of the elastic body 400 is such that when the attracting surface 310 of the magnet body 300 is attracted to the attracted surface, a pressing surface, which will be described later, in a portion protruding from the virtual surface is substantially the same as the virtual surface. It is supposed to be one. The elastic body 400 is made of an elastic material or has a sponge shape. In the case where the elastic body 300 is made of a material having elasticity, the material may be, for example, rubber, natural or synthetic, PVC, other resins, or silicone. There may be. The same applies to the material when the elastic body is sponge-like.
The elasticity of the elastic body 400 may be, for example, in a range where the Young's modulus is less than 40 MPa. Further, when the elastic body is rubber, its hardness may be smaller than Hs 70 degrees. In this embodiment, although not limited to this, the elastic body is made of rubber, and its hardness is about Hs 40 degrees.

The elastic body 400 has a substantially rectangular parallelepiped shape, and has an elongated shape that is long in the left-right direction. The width of the elastic body 400 in the left-right direction is substantially equal to or slightly smaller than the interval between the side surface plates 120. In addition, the length of the elastic body 400 in the front-rear direction is the length in the front-rear direction of the gap formed between the back surface of the magnet body 300 and the back plate 130 formed when the magnet body 300 is attached to the base plate 110. It is equal to or slightly smaller than the length.
The elastic body 400 includes three first locking convex portions 410 that are cylindrical convex portions on the front side of the upper surface in FIG. 1 (FIG. 3), and a rectangular parallelepiped on the rear side of the surface. Two second locking projections 420 that are shaped projections are provided. The shape, size, and position of the first locking convex portion 410 correspond to the shape, size, and position of the first locking hole 112 provided in the base plate 110, and the second The shape, size, and position of the locking convex portion 420 correspond to the shape, size, and position of the second locking hole 131. The elastic body 400 inserts and locks the three first locking convex portions 410 into the three first locking holes 112 at positions corresponding to the first locking convex portions 410 and two second locking protrusions. The convex portions 420 are fixed to the base plate 110 by being inserted and locked in the two second locking holes 131 at positions corresponding to the convex portions 420, respectively.
In a state of being fixed to the base plate 110, the elastic body 400 is in a state in which both side surfaces thereof are along the inner surface of the both side surface plates 120, and the front surface thereof is along the back surface of the magnet body 300, and the back surface thereof is It is in a state along the back plate 130. That is, the elastic body 400 is in a state where it is completely fitted in the above-described gap sandwiched between the both side plates 120 between the back surface of the magnet body 300 and the back plate 130. In this state, the portion of the elastic body 400 that protrudes from the virtual surface (the protruding portion of the elastic body 400 referred to in the present application) is a part of the magnet body 300 when the magnet clip is viewed from the attracted surface side during use. It does not overlap with the suction surface 310. More specifically, the elastic body 400 does not overlap the magnet body 300 when the magnet clip is viewed from the attracted surface side during use.
The method for fixing the elastic body 400 to the base plate 110 is not limited to this. For example, the elastic body 400 can be fixed to the base plate 110 by bonding. In addition, the order of attaching the elastic body 400 and the magnet body 300 to the base plate 110 is not limited. Further, the elastic body 400 may be indirectly fixed to the base plate 110 by being fixed to the magnet body 300, for example.

The lower part of the elastic body 400 in FIG. 1 is a space surrounded by the base plate 110, the side surface plates 120, and the back plate 130 in a state where the elastic body 400 is attached to the base plate 110. It is exposed from the “hole”. That portion is the protruding portion referred to in the present application, and the lower surface in FIG. 1 is the pressing surface 430 referred to in the present application.
The protruding portion of the elastic body 400 is a portion of the elastic body 400 that protrudes from the attracting surface 310 of the magnet body 300, in other words, a portion that collapses when the attracting surface 310 is attracted to the attracted surface. That is, if the suction surface 310 is on the rear side of the virtual surface, a portion of the elastic body 400 on the front side of the virtual surface is a protruding portion.
The protrusion of the elastic body 400 is not necessarily limited to this when the vertical direction of the elastic body 400 in FIG. 1 is defined as the thickness, but it is not less than 4%, preferably 8% or more of the total thickness of the elastic body 400. is occupying. Moreover, the thickness of the protrusion part of the elastic body 400 is larger than 0.2 mm, Preferably, it is larger than 0.2 mm and smaller than 2 mm. More preferably, the thickness of the protrusion is larger than 0.4 mm and smaller than 1 mm.
The pressing surface 430 is provided with grooves 431 extending in the left and right width directions (FIG. 1 (c), FIGS. 2 (b-1) to (b-3)). The groove 431 is not necessarily limited to this, but there are a plurality of grooves, and in this embodiment, there are two grooves.

The handle 200 is attached to the above-described support portion 113 of the base 100.
The handle 200 includes a handle plate 210 that is a plate gently curved in the front-rear direction. On both sides of the handle plate 210 in the width direction, support plates 220, which are plates for attachment to the support portion 113, are attached so as to extend downward in FIG. The interval between the inner surfaces of the two support plates 220 is slightly larger than the interval between the outer surfaces of the two support portions 113.
Both support plates 220 are provided with handle holes 221 that are circular holes, although not limited thereto.
The handle 200 is attached to the base 100 by using a shaft bar 500 which is a rod-shaped body shown in FIG. The shaft bar 500 includes a columnar bar 510, a base 520 on the base end side thereof, and a threaded part 530 threaded on the outer peripheral surface which is thinner than the bar 510 on the tip end side. I have.
In order to attach the handle 200 to the base 100, the inner surfaces of the two support plates 220 are brought into contact with the outer surfaces of the two support portions 113 so that the two support plates 220 straddle the two support portions 113. To. At that time, in the support portion 113 and the support plate 220 that are in contact with each other, the positions of the support hole 113A formed in the support portion 113 and the handle hole 221 formed in the support plate 220 are made to coincide with each other. In this state, the shaft rod 500 is passed through the handle hole 221, the support hole 113 </ b> A, the support hole 113 </ b> A, and the handle hole 221 in this order from the front handle hole 221 in FIG. 3. The screw portion 530 at the tip of the shaft rod 500 has a shaft portion 610 having a hole 611 in which a thread groove is cut on the inner peripheral surface, and a cap screw 600 having a head portion 620 is screwed into the hole 610. It is screwed in a state where the part 530 is penetrated. Accordingly, the two support plates 220 of the handle 200 are attached to the base 100 in a state where they are caulked from both outsides by the head portion 520 of the shaft rod 500 and the head portion 620 of the cap screw 600. Become.
In this state, the handle 200 can rotate around the shaft bar 500.
When the shaft 100 is connected to the base 100 and the handle 200, the torsion spring 700 is passed through the shaft 500. The torsion spring 700 has a first end portion 710 at one end thereof in contact with the upper surface of the base plate 110 in FIG. 1, and a second end portion 720 at the other end of the handle plate 210 in the lower side of FIG. It comes into contact with the surface (FIG. 2 (b-1)). When the torsion spring 700 is twisted so that the angle on the narrow side between the first end 710 and the second end 720 is narrowed from the state shown in FIG. In addition, a force that restores the state shown in FIG. Therefore, the handle 200 applies the force against the elastic force from the torsion spring 700 to the rear end of the handle plate 210, so that the shaft 500 is moved closer to the base 100. Although it can be moved by rotation about the center, when the force is removed, it returns to the state shown in FIG. 2 (b-1) by the elastic force from the torsion spring 700. .
That is, the handle 200 applies a force to the rear end of the handle plate 210 while applying a force to the rear end of the handle plate 210 while setting the front edge of the handle plate 210 in contact with the base plate 110 of the base 100 as an initial position. The end approaches the base plate 110, and the front edge of the handle plate 210 is separated from the base plate 110 so that it can be rotated around the shaft bar 500. Further, the handle 200 returns to its initial position when the above-mentioned force applied to rotate the handle 200 is removed by the elastic force from the torsion spring 700.

Next, the usage method and operation of the magnet clip will be described.
When using a magnetic clip, first, an object is sandwiched between the base plate 110 of the base 100 and the handle plate 210 of the handle 200. Although not limited to this, in this embodiment, it is assumed that the object is a plurality of stacked sheets. In order to hold the paper with the magnet clip, by applying a force to the rear end of the handle plate 210, the handle 200 is rotated around the shaft bar 500 to separate the front edge of the handle plate 210 from the base plate 110, Thereby, the object is inserted into the gap between the opened handle plate 210 and the base plate 110. Next, when the force applied to the handle plate 210 is removed, the handle 200 is returned to the initial position where the front edge of the handle plate 210 is in contact with the base plate 110 of the base 100 by the elastic force from the torsion spring 700. The power to try works. As a result, the object is sandwiched between the base plate 110 of the base 100 and the handle plate 210 of the handle 200.

Next, the magnet clip holding the object between the base plate 110 and the handle plate 210 is brought close to the attracted surface X as shown in FIG. In FIG. 4A, only the base 100 of the magnet clip, the magnet body 300, and the elastic body 400 are shown, and the handle 200 is not shown. In FIG. 4A, the magnet clip is brought close to the attracted surface X while keeping the attracting surface 310 of the magnet body 300 parallel to the attracted surface X. There is no need to keep the suction surface 310 and the suction target surface X parallel when approaching.
In the state before the attracting surface 310 of the magnet body 300 is attracted to the attracted surface X, the pressing surface 430 of the elastic body 400 is more attracting surface than the attracting surface 310 of the magnet body 300 as shown in FIG. Assuming that 310 is parallel to the attracted surface X, it is located on the attracted surface X side and has a step L with respect to the attracted surface 310.
Then, when the attracting surface 310 of the magnet body 300 is attracted to the attracted surface X, the elastic body 400 is crushed between the base 100 and the attracted surface X as shown in FIG. The pressing surface 430 is substantially flush with the attracting surface 310 of the magnet body 300.
As shown in FIG. 5, the magnet clip is normally attracted to the attracted surface X with the front side of the base 100 and the handle 200 facing downward. Therefore, a downward force in FIG. 5 is normally applied to the magnet clip and the object Y sandwiched between the magnet clip by gravity. That is, the magnet clip is scheduled to slide downward in FIG. If the direction is defined as the sliding direction, the elastic body 400 is provided on the rear side with respect to the sliding direction when the attracting surface 310 of the magnet body 300 is attracted to the attracted surface X as shown in FIG. It has become. Further, the groove 431 provided on the pressing surface 430 of the elastic body 400 along the length direction of the pressing surface 430 is in a state orthogonal to the sliding direction.
If a force, for example, a downward force, is applied to the magnet clip at this time, an adhesion frictional force is generated between the attracting surface 310 and the attracted surface X of the magnet body 300 in the opposite direction to the direction in which the force acts, and the elasticity An adhesion frictional force, a deformation loss frictional force, and a digging frictional force are generated between the pressing surface 430 of the body 400 and the attracted surface X, contrary to the direction in which the force works.
Thereby, a magnet clip is firmly fixed with respect to the pressing surface 430, for example, becomes difficult to slide down.
Further, the elastic body 400 is positioned on the rear side of the magnet body 300 with respect to the downward force, and is elongated in a direction orthogonal to the downward force. Rotation that lowers the right side or the left side is also difficult to occur.

[Experimental example]
The magnetic clip described above is changed in the step L in FIG. 4 (where L is not the distance from the attracting surface 310 to the pressing surface 430 but the distance from the virtual surface to the pressing surface 430). A plurality of prototypes were made, and the prototyped magnetic clips were attracted to the attracted surface, and an experiment was conducted to determine how hard each slip is.
The attracting surface 310 of the magnet body of the prototype magnet clip is located 0.3 mm behind the virtual surface. The elastic material used in the prototype magnet clip is the same, and is a urethane rubber having a Young's modulus of about 8.9 MPa and a hardness of about Hs 40 degrees. Moreover, the thickness of the part which exists in the back side rather than the virtual surface of each elastic body 400, in other words, the part hidden in the “hole” in the present invention, is 4.3 mm.
The test for the difficulty of slipping the magnet clip was performed by making the surface of the iron plate (part of the book end) arranged vertically (the part of the book end) the attracted surface X and attracting the magnet clip to the attracted surface X. A force was applied to the magnet clip attracted to the surface X in the sliding direction described with reference to FIG. 5, and the magnet clip was slid somewhat on the attracted surface X from a stationary state. The recording was performed with respect to the position of the magnet clip after the magnet clip started to move from a stationary state, and the force applied to the magnet clip at that position (the force required to continue moving the magnet clip).
The position of the magnet clip and the force applied to the magnet clip were recorded using SHIMADZU AGS-J (trademark), which is a tabletop precision universal testing machine manufactured and sold by Shimadzu Corporation.

The experimental results are shown in Tables 1 to 11 in FIGS. The stroke on the horizontal axis in each table indicates the distance in the sliding direction from a predetermined reference point to the magnet clip, and the force on the vertical axis in each table indicates the force applied to the magnet clip when the magnet clip is in that position.
In the magnet clip whose experimental results are shown in Table 1, the above-described step L = 0 mm, and in the magnetic clip whose experimental results are shown in Table 2, the above-described step L = 0.2 mm. Hereinafter, in the magnet clips after the magnet clip whose experimental results are shown in Table 3, the step is increased in steps of 0.2 mm. In the magnetic clip whose experimental results are shown in Table 11, the step L = 2 mm.
In the experimental results shown in Table 1, the magnetic clip starts to move when a force of approximately 8.7 N is applied (the magnet clip does not move at a portion where the test force increases substantially vertically even though the stroke around 6 mm hardly changes). In the state where the graph did not move and the graph moved substantially horizontally thereafter, the magnet clip moved.) The maximum test force required to keep moving the magnet clip as it was was 8.7 N. At this time, the elastic body 400 is not compressed because the magnet body 300 of the magnet clip is not compressed even if it is attracted to the attracted surface.
Similarly, a magnet clip with a level difference L = 0.2 mm starts to move when a force of about 9 N is applied (in the part where the test force increases substantially vertically even though the stroke around 6 mm hardly changes) In the state where the graph did not move and the graph moved substantially horizontally thereafter, the magnet clip was moving.) The maximum load required to keep moving the magnet clip as it was was 9.1 N.
Similarly, the magnetic clip with a step L = 0.4 mm started to move when a force of approximately 9 N was applied, and the maximum load required to keep moving the magnetic clip as it was was 15.4 N.
As such, the maximum test force was examined in order up to a magnet clip with a step L = 2 mm.
The results are summarized in Table 12 and Table 13 shown in FIG.
Table 12 shows the results of the tests shown in Tables 1 to 11 as Tests 1 to 11, and the maximum test force obtained in each test (= the magnet proportional to the attractive force of the magnet clip to the attracted surface X) The numerical value of the frictional force between the clip and the attracted surface X is shown, and Table 13 is a graph of the contents of Table 12.
Table 12 shows, as a compression ratio, how much the thickness of the elastic body is reduced from the original thickness when the attracting surface of the magnet body is attracted to the attracted surface in each magnet clip. doing. For example, the elastic body 400 in the magnet clip of L = 0.2 mm has an original thickness of 4.3 mm (thickness hidden in the hole) +0.2 mm (thickness corresponding to the step L) = 4.5 mm, Of these, the thickness that is crushed and thinned is 0.2 mm, which is the thickness corresponding to the level difference L, so 0.2 mm ÷ 4.5 mm × 100 = 4.4%. Similarly, the elastic body 400 in the magnet clip of L = 0.4 mm is thinned by 0.4 mm ÷ (0.4 mm + 4.3 mm) × 100 = 8.5%. For other magnet clips, the same calculation was performed to determine the compression ratio.
As is clear from Tables 12 and 13, the maximum test force when the level difference L = 0 mm is significant compared to the maximum test force when the level difference L = 0.2 mm (compression ratio is 4.4%). Small. The difference becomes more noticeable when the level difference L is larger than 0.4 mm (compression ratio is 8.5%), and gradually decreases from the time when the level difference L is 0.8 mm (compression ratio = 16%). Even when the step L = 2 (compression rate is 32%), the maximum test force is significantly larger than that when the step L = 0 mm, and the step L = 0.2 mm (compression rate is 4.4%). It remains bigger than ever.
In particular, in the range between the step L = 0.4 mm (compression rate is 8.5%) and the step L = 1 (compression rate is 19%), the maximum test force is considerably higher than that in the case where the step L = 0 mm. It is getting bigger. This indicates that if the step is within such a range, the magnet clip is extremely difficult to slide with respect to the attracted surface X.

<< Second Embodiment >>
In the second embodiment, a magnet hook will be described.
The magnet hook is used by detachably attracting an object to be attracted to a surface to be attracted in a state where an object to be latched such as clothes, a bag, or kitchen utensils is latched to the hook. As the magnet hook in this embodiment, the conventional magnet hook configuration can be used as it is. The magnet hook of this embodiment is different from the conventional magnet hook in that an elastic body described later is provided.
Hereinafter, the structure of the magnet hook will be described with reference to FIG.

The magnet hook includes a base 100.
Although not limited to this, as shown in the perspective view of the magnet hook in FIG. 10A, the base 100 of this embodiment is formed into a thin cylindrical shape or a disc shape as a whole. The base 100 includes a base plate 110, and a base end of a side plate 121 having the same width in all portions is connected to an edge on the back side of the base plate 110. The side plate 121 extends over the entire circumference of the edge of the base plate 110. However, the side plate 121 may not be present.
A hook 810 is attached to the front surface of the base 100. The hook 810 only needs to be able to lock the object with respect to the hook 810, and has an appropriate configuration according to the object to be locked.
The space surrounded by the inner surface of the side plate 121 and the back surface of the base plate 110 corresponds to the “hole” in the first embodiment, and the surface on which the entire edge that is the tip of the side plate 121 rides is It is a “virtual surface” in one embodiment.
As shown in the rear view of FIG. 10 (b) and the side sectional view of FIG. 10 (c), the magnet body 300 and the elastic body 400 are fixedly fitted into the holes provided in the base 100 of the magnet hook. ing. As in the case of the first embodiment, the attracting surface 310 of the magnet body 300 coincides with the virtual surface, and the pressing surface 430 of the elastic body 400 protrudes from the virtual surface.
The magnet body 300 and the elastic body 400 can be the same as those described in the first embodiment except for their shapes. Moreover, the magnet body 300 and the elastic body 400 of this embodiment are being fixed to the base board 110, for example by adhesion | attachment.
The method of using the magnet hook is not different from the method of using a normal magnet hook. A magnet hook is used by attracting the magnet body 300 to a generally attracted surface.

«Third embodiment»
In the third embodiment, a magnet box will be described.
The magnet box is used by detachably adsorbing the object to be attracted to a surface to be attracted in a state in which an object to be stored such as an accessory or kitchen utensil is housed in a box provided therein. For the magnet box in this embodiment, the conventional magnet box configuration can be used as it is. The magnet box of this embodiment is different from the conventional magnet box in that an elastic body described later is provided.
Hereinafter, the structure of the magnet box will be described with reference to FIG.

The magnet box includes a base 100.
The base 100 includes a base plate 110. Although not limited to this, the base plate 110 of this embodiment is rectangular and made of resin.
On the back side of the base plate 110, two sets of base ends of a surrounding plate 122 in which plates of the same width are assembled in a rectangular shape are attached. It should be noted that the set of four surrounding plates 122 may be integrated, or more specifically, integrated with the base plate 110. A box 820 is provided on the front side of the base plate 110. Box 820 has an open top and a bottom.
The space surrounded by the inner peripheral surface of the enclosing plate 121 made up of four pieces and the back surface of the base plate 110 corresponds to the “hole” in the first embodiment, and is made up of a set of four pieces. The surface on which the entire edge, which is the tip of the surrounding plate 122, is a “virtual surface” in the first embodiment. In this embodiment, there are two sets of “holes”, and two sets of “virtual planes”. The two “virtual planes” are on the same plane in this embodiment. Note that the surrounding plate 121 may be omitted.
The magnet body 300 and the elastic body 400 are fixedly fitted in the two holes, respectively. As in the case of the first embodiment, the attracting surface 310 of the magnet body 300 coincides with the virtual surface, and the pressing surface 430 of the elastic body 400 protrudes from the virtual surface.
The magnet body 300 and the elastic body 400 can be the same as those described in the first embodiment except for their shapes. Moreover, the magnet body 300 and the elastic body 400 of this embodiment are being fixed to the base board 110, for example by adhesion | attachment.
The method of using the magnet box is not different from the method of using a normal magnet box. A magnet box is used by attracting a magnet body 300 to a generally attracted surface.

100 Base 110 Base plate 111 Fixing hole 112 First locking hole 120 Side plate 130 Back plate 131 Second locking hole 200 Handle 210 Handle plate 220 Support plate 300 Magnet body 310 Adsorption surface 400 Elastic body 410 First engagement Stop projection 420 Second lock projection 430 Press surface 431 Groove 500 Shaft rod 700 Torsion spring

Claims (19)

A magnet body having an attracting surface, which is a plane that is scheduled to be attracted to a attracted surface that is a predetermined plane having the property of being attracted to an object having magnetic force,
It is arranged in the vicinity of the attracting surface, protrudes from a plane including the attracting surface of the magnet body, and when the attracting surface is attracted to the attracted surface, An elastic body having elasticity, having a protrusion that is pressed and crushed;
Comprising
Magnet structure. The elasticity of the elastic body has a Young's modulus smaller than 40 MPa,
The magnet structure according to claim 1. The material of the elastic body is rubber, resin, or silicone.
The magnet structure according to claim 1. The elastic body is sponge-like,
The magnet structure according to claim 1. The magnet body and the elastic body are fixed to a main body that fixes them together.
The magnet structure according to claim 1. The body includes a hole having an annular edge that rides on a virtual plane that is a virtual plane;
The magnet body and the elastic body are arranged such that the attraction surface, which is a flat surface, coincides with the virtual surface or is positioned slightly rearward from the virtual surface, and the protruding portion protrudes from the virtual surface. , Fitted inside the hole,
The magnet structure according to claim 5. The protrusion of the elastic body has a pressing surface that is a plane parallel to the suction surface.
The magnet structure according to claim 1 or 6. The protruding portion of the elastic body has a pressing surface that is a plane parallel to the suction surface,
The pressing surface is configured to recede more than 0.2 mm when the attracting surface of the magnet body is attracted to the attracted surface.
The magnet structure according to claim 6. The protruding portion of the elastic body has a pressing surface that is a plane parallel to the suction surface,
The pressing surface is configured to recede in a range larger than 0.2 mm and smaller than 2 mm when the attracting surface of the magnet body is attracted to the attracted surface.
The magnet structure according to claim 6. The protruding portion of the elastic body has a pressing surface that is a plane parallel to the suction surface,
The pressing surface is configured to recede in a range larger than 0.4 mm and smaller than 1 mm when the attracting surface of the magnet body is attracted to the attracted surface.
The magnet structure according to claim 6. The elastic body has a thickness that is 4% or more smaller when the suction surface is attracted to the attracted surface than when the attracting surface is not attracted to the attracted surface. Has become,
The magnet structure according to claim 1 or 7. The elastic body has a thickness that is 8% or more smaller when the adsorption surface is adsorbed on the adsorption surface than when the adsorption surface is not adsorbed on the adsorption surface. Has become,
The magnet structure according to claim 1 or 7. The elastic body is provided on the rear side with respect to a magnet body in a sliding direction, which is a direction in which the magnet structure is scheduled to slide when the attracting surface is attracted to the attracted surface.
The magnet structure according to claim 1 or 7. The elastic body is a long member whose longitudinal direction is a direction orthogonal to the sliding direction.
The magnet structure according to claim 13. At least one groove is provided on the pressing surface of the elastic body,
The magnet structure according to claim 7. The pressing surface has at least one groove in a direction perpendicular to a sliding direction, which is a direction in which the magnet structure is scheduled to slide when the attracting surface is attracted to the attracted surface. Provided,
The magnet structure according to claim 7 or 13. The attracting surface of the magnet body and the projecting portion of the elastic body do not overlap when viewed from the attracted surface side during use.
The magnet structure according to claim 1. A concave portion is provided on one of the main body and the elastic body, and a convex portion is provided on the other of the main body and the elastic body, and the elastic body is fixed to the main body by engaging the convex portion with the concave portion. Installed,
The magnet structure according to claim 5. The body is provided with either a clip that can hold a predetermined object, a box that can store the predetermined object, or a hook that can lock the predetermined object.
The magnet structure according to claim 5.

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