JP2508861Y2 - Writing instruments and writing instrument stands - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention is intended to support a writing instrument such as a ballpoint pen by vertically standing it during use, or temporarily suspending use during use.
The present invention relates to a writing tool and a writing tool stand combination structure to be used when it is placed.

(Prior Art) Conventional writing instrument stands are small in size so that when a writing instrument currently in use is temporarily placed, it can be used immediately when it is desired to use it again, and it does not take up a limited desk space as much as possible. Even though it is important to realize this, it is the current situation that these conditions are not fully satisfied.

On the other hand, Japanese Utility Model Laid-Open No. 61-56089 proposes a configuration in which the writing instrument is vertically set by the repulsive force of the writing instrument side magnet and the writing instrument stand side magnet.

FIG. 2 shows the structure of a writing instrument and a writing instrument stand proposed in Japanese Utility Model Publication No. 61-56089. In this figure,
Reference numeral 1 is a writing tool stand, 2 is a writing tool, and the writing tool stand 1 is one in which an annular permanent magnet 4 is arranged around a conical concave surface of a bottom member 3, and a cup-shaped member 5 is covered to be integrated.
Further, the writing instrument 2 has a structure of a general ball-point pen to which a cylindrical permanent magnet 6 is added. Here, both the annular permanent magnet 4 and the cylindrical permanent magnet 6 have magnetic poles on the upper and lower end surfaces and have the same poles (for example, the S poles of the permanent magnets 4 and 6 face each other).
To be set.

In the case of the configuration shown in FIG. 2, when the tip of the writing instrument 2 is engaged with the center of the conical concave surface, the writing instrument 2 is in the vertical state due to the homopolar repulsion force of the writing instrument standing side permanent magnet 4 and the writing instrument side permanent magnet 6. Hold.

(Problems to be Solved by the Invention) FIG. 4 shows a magnetic flux diagram of the writing instrument standing side permanent magnet 4 in the conventional structure shown in FIG. 2, and the curve (a) in FIG. 5 shows the writing instrument standing side permanent magnet 4. 3 shows the relationship between the radial distance Xmm of the permanent magnet 4 and the magnetic flux density G at a position 10 mm above the upper end surface of FIG. However, the outer diameter of the permanent magnet 4 is 50 mm and the thickness is 10 mm.
And As is clear from these FIG. 4 and FIG. 5 curves (a), in the conventional structure of FIG. 2, the magnetic flux density due to the S pole is large above the writing instrument standing side permanent magnet 4, and the gap between the writing instrument side permanent magnet 6 and The homopolar repulsive force of becomes large. Therefore, the component of the force for vertically lifting the writing instrument 2 by this homopolar repulsive force is large, and the component of the force for attracting the tip of the writing instrument to the conical concave surface is small. Therefore, unless the weight of the writing instrument 2 is increased and the mechanical engagement or friction between the tip of the writing instrument 2 and the conical concave surface is sufficiently increased, the support of the writing instrument may become unstable.

When the writing tool 2 after use is returned to the writing tool stand 1, the writing tool 2 is moved in the direction of the arrow G through the state of the imaginary line F to dispose the tip of the writing tool 2 on the conical concave surface. In the vicinity of the position of the line F, it is estimated from the curves (a) in FIGS. 4 and 5 that the magnetic flux density of the S pole of the writing instrument stand side is considerably large, and the permanent magnet 4 of the writing instrument stand side shown in FIG. Magnetic flux from the S pole and S of the writing instrument side permanent magnet 6
The magnetic flux from the poles strongly influence each other, and a strong repulsive force is generated. Therefore, the operation of returning the writing instrument 2 to the writing instrument stand 1 may not be smooth.

In view of the above points, an object of the present invention is to provide a writing instrument and a writing instrument stand that can stably support the writing instrument in a vertical state and can smoothly perform an operation of returning the writing instrument after use to the writing instrument stand.

(Means for Solving the Problem) In order to achieve the above object, the writing instrument and the writing instrument stand of the present invention have a writing instrument structure in which a permanent magnet is mounted near the tip so that one magnetic pole is located at the tip side, A writing instrument stand for supporting a writing instrument in a vertical state includes a main body base portion having a conical concave surface, and a first annular permanent magnet having a magnetic pole having the same polarity as the magnetic pole at the tip of the writing instrument side permanent magnet formed on the upper end surface. A second annular permanent magnet, which is arranged below the first annular permanent magnet with a space therebetween and whose magnetic poles of the same polarity as the magnetic poles of the lower end surface of the first annular permanent magnet face each other. I am trying.

(Operation) In the present invention, a first annular permanent magnet having the same magnetic pole as the magnetic pole at the tip of the writing instrument side permanent magnet formed on the upper end surface,
A second annular permanent magnet, which is arranged below the first annular permanent magnet with a gap and in which a magnetic pole on the lower end surface of the first annular permanent magnet faces a magnetic pole of the same polarity, is used as a writing instrument. Since it is incorporated, the magnetic flux above the first annular permanent magnet is
The magnetic flux is strong only in the vicinity of the upper end surface of the annular permanent magnet, and the magnetic flux becomes extremely weak at a position separated above the upper end surface. Therefore, when the writing instrument after use is returned to the writing instrument stand, the repulsive force between the permanent magnets of both the writing instrument and the writing instrument stand is reduced, and the writing instrument can be smoothly returned above the writing instrument stand central axis. After bringing it on the center axis of the writing stand, the magnetic flux flows between the different poles of the writing instrument side permanent magnet and the writing instrument stand side permanent magnet so that the writing instrument tip is smoothly sucked into the conical concave surface of the writing instrument stand. The writing instrument can be returned to the writing instrument stand.

Further, when the tip of the writing instrument is engaged with the center of the conical concave surface of the writing instrument stand, the permanent magnet on the writing instrument side and the homopolar repulsive force of the first annular permanent magnet on the writing instrument stand side, and the permanent magnet on the writing instrument side Due to the balance between the different polar attraction force between the first and second annular permanent magnets and the gravity applied to the writing instrument, the writing instrument can maintain a stable upright state without falling in any direction. Easy to use and kept in a convenient state. The permanent magnet tip side magnetic pole on the writing instrument side and the first and second magnetic poles
The attracting force between the annular permanent magnets (the magnetic poles of the lower end surface of the first permanent magnet and the upper end surface of the second permanent magnet) is stronger than in the case of the conventional example shown in FIG. The force of sucking the tip toward the conical concave side increases, which contributes to stable support of the writing instrument.

In addition, even if the writing instrument is tilted due to an unexpected external force, the balance between the above-mentioned magnetic force and gravity restores a stable upright state, and when the writing instrument is placed, the writing instrument does not have to be placed vertically correctly on the writing instrument stand. Then, since it is naturally kept upright correctly, the writing instrument can be easily placed.

(Example) An example of a writing instrument and a writing instrument stand according to the present invention will be described below with reference to the drawings.

In FIG. 1, 11 is a writing tool stand, 12 is a writing tool, and the writing tool 12 is a structure in which a cylindrical permanent magnet 13 is added to the lower part of the structure of a general ballpoint pen. The permanent magnet 13 is, for example, an isotropic ferrite permanent magnet or the like, which generates a magnetic field for erecting the writing instrument 12 as described later, and lowers the center of gravity of the writing instrument 12 in the upright state in order to stabilize the upright state. Have a function. The magnetic pole of the cylindrical permanent magnet 13 has an S pole on the other side if the tip side is an N pole.
It is a pole.

On the other hand, the writing instrument stand 11 includes a main body base 15 made of a non-magnetic material such as plastic, a first annular permanent magnet 16, a spacer (non-magnetic or magnetic) 17, and a second annular permanent magnet 18.
And a cover 19 made of non-magnetic material such as plastic. Here, a cylindrical convex portion 20 is integrally formed on the main body base portion 15, and a conical concave surface 21 is formed on the upper end surface of the cylindrical convex portion 20.
Are formed. Then, the second annular permanent magnet 18 is arranged along the outer peripheral surface of the columnar convex portion 20, and the first annular permanent magnet 16 is formed into the second annular permanent magnet 16 with the spacer 17 interposed.
Are stacked on the annular permanent magnet 18 of. The first of these
The second permanent magnets 16 and 18 and the spacer 17 are integrated so as not to be displaced by covering them with a cover 19 and fixing them to the main body base portion 15 by adhesion or the like. The magnetic pole on the upper end surface of the first annular permanent magnet 16 has the same polarity as the magnetic pole on the lower end surface of the writing instrument side permanent magnet 13, and is an N pole in the illustrated case. Further, the magnetic pole on the lower end surface of the first annular permanent magnet 16 and the magnetic pole on the upper end surface of the second annular permanent magnet 18 have the same polarity, and are S poles in the illustrated case.

The first and second permanent magnets 16 and 18 are, for example, isotropic ferrite permanent magnets. When the same material and the same diameter are used, the thickness of the first permanent magnet 16 is t ₁ , and the second permanent magnet 16 is the second permanent magnet. When the thickness of the magnet 18 is t ₂ , t ₁ ≤t ₂ is set. The thickness of the spacer 17 is such that the inner diameter of each permanent magnet 16 and 18 is about 20 mm and the outer diameter is 40 to 5
When it is about 0 mm, it is set to about 1 to 5 mm.

The diameter of the conical concave surface 21 is set to be larger than the large-diameter portion of the writing instrument 12, and a central concave portion 22 is further provided at the center of the conical concave surface 21 so that the tip 12A of the writing instrument 12 can be inserted. The tip position of the writing instrument 12 is fixed to make the upright state more stable.

The cover 19 has an opening 23 having the same diameter as the diameter of the cylindrical protrusion 20.

In the above embodiment, the first annular permanent magnet 16 and the second annular permanent magnet 16
Since the magnetic poles of the same polarity of both permanent magnets face each other, the magnetic pole on the upper end surface side of the first annular permanent magnet 16 is somewhat weakened, and the magnetic flux is As shown by the dotted line in FIG. 1, the magnetic force is strong only in the vicinity of the upper end surface of the first annular permanent magnet 16 and the magnetic flux becomes extremely weak at a position separated above the upper end surface. This is because the S pole of the second annular permanent magnet 18 is the N of the upper end surface of the first annular permanent magnet 16.
It is considered that this is because it acts to cancel the magnetic field of the pole.

FIG. 3 shows a magnetic flux line diagram of the annular permanent magnets 16 and 18 on the writing instrument stand side in the case of the embodiment, and the curve (b) in FIG. 5 is the position 10 mm above the upper end surface of the permanent magnet 16. Permanent magnet 16
The relationship between the radial distance Xmm and the magnetic flux density G is shown. However, the outer diameter of the permanent magnet 16 was 44.3 mm, the inner diameter was 22 mm, and the thickness was 8 mm, and the outer diameter of the permanent magnet 18 was 44.3 mm, the inner diameter was 22 mm, and the thickness was 12 mm. Fig. 4 and Fig. 5 which are magnetic flux diagrams of the conventional example Curve (a)
It can be seen that the magnetic flux density above the annular permanent magnet 16 is smaller than that of the above, and the polarity above the central portion of the annular permanent magnet 16 is reversed as compared to the periphery. That is, when the permanent magnet 13 on the writing instrument side passes around the annular permanent magnet 16, the repulsive force between the N poles acts, but the repulsive force is weak, and the permanent magnet 13 on the writing instrument side is centered on the annular permanent magnet 16. N when coming near
The attraction force between the pole and the S pole will work.

In the above embodiment, the first annular permanent magnet 16 and the second annular permanent magnet 16
Since the permanent magnets 18 are combined with each other and the magnetic poles of the same polarity of both permanent magnets are opposed to each other, the upper end surface side of the first annular permanent magnet 16 as shown by the curve (b) in FIG. The magnetic pole is weakened somewhat, and the magnetic flux is strong only near the upper end face of the first annular permanent magnet 16 as shown by the dotted line in FIG. 1, and the magnetic flux at the position separated above the upper end face is very weak. Become. It is considered that this is because the S pole of the second annular permanent magnet 18 acts to cancel the magnetic field of the N pole of the upper end surface of the first annular permanent magnet 16.

Therefore, considering the operation of returning the writing tool 12 after use to the writing tool stand 11, the writing tool 12 is moved in the direction of the arrow K through the state of the imaginary line J to dispose the tip of the writing tool 12 on the conical concave surface 21. In the vicinity of the position of the imaginary line J, the magnetic flux above the N pole of the first permanent magnet 16 on the writing instrument stand side and the magnetic flux from the N pole of the writing instrument side permanent magnet 13 hardly affect each other, and the repulsive force is small. Becomes weak. Further, after bringing the writing instrument 12 above the central axis of the writing instrument stand 11, the attraction force between the N pole of the writing instrument side permanent magnet and the S poles of the first and second permanent magnets on the writing instrument stand side. The action of sucking the tip of the writing instrument 12 into the conical concave surface 21 occurs. Therefore, the operation of returning the writing instrument 12 to the writing instrument stand 11 is performed extremely smoothly.

Further, when the tip of the writing instrument 12 is engaged with the central recess 22 of the conical concave surface 21 of the writing instrument stand 11, the cylindrical permanent magnet 13 on the writing instrument side and the N of the first annular permanent magnet 16 on the writing instrument stand side.
The repulsive force between the poles and the N pole of the permanent magnet 13 on the writing instrument side and the first
And the balance between the attractive force between the S-poles of the second annular permanent magnets 16 and 18 and the gravity applied to the writing instrument 12, keep the writing instrument 12 in a stable upright state without falling in any direction. You can The attraction force between the north poles of the permanent magnet 13 and the south poles of the first and second permanent magnets 16 and 18 on the writing instrument side is stronger than in the case of the conventional example shown in FIG. For example, the force for sucking the tip of the writing instrument toward the conical concave surface 21 side is increased to enable stable support of the writing instrument 12.

The writing tool side permanent magnet and the writing tool stand side permanent magnet do not have to be made of the same material, and may be made of different materials.

(Effects of the Invention) As described above, the writing instrument and the writing instrument stand of the present invention incorporate the first annular permanent magnet and the second annular permanent magnet into the writing instrument stand side so that the writing instrument after use becomes the writing instrument stand. The returning operation can be performed extremely smoothly, and the operation of supporting the writing instrument in the vertical state with the writing instrument stand can be stabilized.

[Brief description of drawings]

FIG. 1 is a front sectional view showing an embodiment of a writing instrument and a writing instrument stand according to the present invention, FIG. 2 is a front sectional view of a conventional writing instrument and a writing instrument stand, and FIG. 3 is a magnetic flux line in an embodiment of the present invention. Figure,
FIG. 4 is a magnetic flux diagram in the case of the conventional example, and FIG. 5 is a graph showing the magnetic flux density at the writing tool upright position in the case of the conventional example and the embodiment of the present invention. 1,11 …… writing tool stand, 2,12 …… writing tool, 13 …… cylindrical permanent magnet, 15 …… main body base part, 16,18 …… annular permanent magnet, 17 …… spacer, 19 …… cover, 21 ... Conical concave surface.

Claims (2)

(57) [Scope of utility model registration request] 1. A writing instrument in which a permanent magnet is mounted near the tip so that one of the magnetic poles is located on the tip side, a main body base portion having a conical concave surface, and a magnetic pole having the same polarity as the magnetic pole at the tip of the writing instrument side permanent magnet. A first annular permanent magnet having a magnetic pole formed on its upper end surface, and a magnetic pole on the lower end surface of the first annular permanent magnet, which is arranged at a distance below the first annular permanent magnet and has the same polarity. A writing instrument and a writing instrument stand, comprising: a writing instrument stand having a second annular permanent magnet whose magnetic poles face each other. 2. When the first and second annular permanent magnets are made of the same material and the thickness of the first annular permanent magnet is t ₁ and the thickness of the second annular permanent magnet is t _2. , T ₁ ≦ t ₂ , the writing instrument and the writing instrument stand according to claim 1.