JP2004066560A - Grip structure of writing utensil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the grip structure of a writing utensil which fits well to the fingertip of a writer and prevents fatigue caused by writing for a long time from occurring and allows a comfortable writing. <P>SOLUTION: In the grip structure of the writing utensil constituted of its barrel 1 and at least the upper and lower grip covers 2 and 3 wrapping the grip part of the barrel 1, the hardness of the lower grip cover 2 is lower than that of the upper grip cover 3, and at least the lower grip cover 2 and the barrel 1 are simultaneously molded. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a grip structure in which a grip cover of a writing instrument such as a ballpoint pen and a mechanical pencil is provided with a double grip cover.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in order to reduce the fatigue of a writer during writing, a writing instrument such as a ballpoint pen in which a grip portion is covered with a grip cover made of rubber or soft plastic has been proposed as a grip structure. However, most of these grip structures simply cover the barrel with a single layer of grip cover.If the grip cover is thin, it is susceptible to the hardness of the barrel and cannot avoid fatigue due to long-time writing. Was. On the other hand, when the grip cover is thickened, the diameter of the grip portion becomes unnecessarily large, making it difficult to grasp and avoiding fatigue due to long-time writing, and also has an aesthetic problem.
[0003]
[Problems to be solved by the invention]
Therefore, the present invention has solved the above-mentioned conventional inconveniences, and has a gripping structure of a writing instrument that can fit a fingertip of a writer and prevent fatigue due to long-time writing to enable comfortable writing. The purpose is to provide.
[0004]
Further, according to the present invention, it is possible to easily form a grip cover having a low hardness by simultaneous molding with a shaft cylinder, thereby simplifying the manufacturing and consequently making the grip structure of a writing implement inexpensive and having good adhesion alignment. It also aims to provide.
[0005]
Still further, according to the present invention, since the grip cover has a double structure and the upper grip cover is transparent or translucent so that the shape, pattern or color of the outer periphery of the barrel can be viewed from the outside, a three-dimensional design in the grip portion is provided. Another object of the present invention is to provide a writing instrument grip structure that is excellent in aesthetics and that can enjoy the same.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, in a grip structure of a writing instrument comprising a barrel of the writing instrument and upper and lower grip covers covering a grip portion of the barrel, the hardness of the lower grip cover is The present invention provides a writing instrument grip structure in which the hardness is lower than the hardness of the upper grip cover, and at least the lower grip cover and the barrel are formed at the same time.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a grip structure according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
1 to 3 show a grip structure of a writing instrument according to Embodiment 1 of the present invention, that is, a structure of a grip portion of a writing instrument such as a ball-point pen and a mechanical pencil. In the figure, a barrel 1 (primary side) and a lower grip cover 2 (secondary side) on the outer periphery of the barrel 1 are formed by simultaneous molding. The barrel 1 is made of a material such as ABS resin, acrylic resin, polycarbonate (PC), and polypropylene (PP). These are suitable for shaft cylinders because of their high impact strength, high heat resistance, low water absorption, and excellent transparency and optical properties.
[0008]
On the other hand, the lower grip cover 2 is made of a relatively thick layer made of a soft resin such as a thermoplastic elastomer (TPE). Specifically, for example, if the thickness of the lower grip cover 2 is about 2 mm, the thickness of the upper grip cover 3 may be selected to be about 1 mm.
[0009]
The barrel 1 and the lower grip cover 2 are formed by simultaneous molding, such as injection molding, extrusion molding, or the like, so-called two-color molding. For example, in the case of molding using a two-color extruder, a pair of extruding barrels is provided, and two colors or two types of materials can be simultaneously extruded from a common die and molded simultaneously. In this case, it is preferable that the lower grip cover 2 be made of a relatively soft material, that is, a material which is usually hard enough to be formed as a single body, that is, a material having a Shore A hardness of 5 degrees or more and less than 30 degrees. Therefore, for example, one having a Shore A hardness of 5 degrees can be selected and used. Such a soft material is usually difficult to mold by itself, but is molded simultaneously with the material of the hard barrel 1, so that it can be molded regardless of its softness.
[0010]
The lower grip cover 2 having a Shore A hardness of 30 degrees or more, which is harder than the lower grip cover 2, is used as the lower grip cover 2 of the outer periphery of the shaft cylinder 1 formed at the same time. I can do it. Then, the upper grip cover 3 that is thinner than the thickness of the lower grip cover 2 is fitted to the lower grip cover 2. In addition, as the material of the upper grip cover 3, silicone, thermoplastic elastomer, or the like is preferable. These have the characteristics of being chemically inert, resistant to a wide range of temperature changes, and having high electrical insulation.
[0011]
As is apparent from FIG. 3, if the annular step portion 12 is formed at the front and rear ends of the grip portion of the barrel 1, it is possible to form the barrel 1 and the lower grip cover 2 simultaneously and to form the upper grip cover 3. There is an advantage that the close contact matching becomes good at the time of attachment. Further, although the case where the leading end portion 11 of the barrel 1 is integrated with the barrel body is illustrated, it is separate from the barrel body so that it can be detachably attached to the barrel body by screwing or the like. Of course, it is also good.
[0012]
Hereinafter, the manufacturing of the grip of the writing instrument according to the embodiment of the present invention will be described. First, the shaft cylinder 1 and the lower grip cover 2 are simultaneously molded by injection molding or the like. In this case, since the lower grip cover 2 uses a material having extremely low hardness, it is usually difficult to form the lower grip cover 2 as a single body. However, since the lower grip cover 2 can be formed together with the shaft cylinder 1, it can be formed without any problem. In this case, since the grip portion of the barrel 1 is formed to have a reduced diameter, a step portion 12 is formed at the front and rear ends thereof, and the lower grip cover 2 is disposed at the reduced diameter portion between the step portions 12. Therefore, close matching is good.
[0013]
Further, the separately formed upper grip cover 3 that is harder than the hardness of the separately formed lower grip cover 2 is fitted to the grip portion formed at the same time. The upper grip cover 3 is also fitted between the step portions 12 formed on the grip portion of the shaft cylinder 1 by fitting. As a result, it becomes flush with the other outer peripheral surface of the shaft cylinder 1, which is also preferable from the aesthetic point of view.
[0014]
Actually, when the writer grips and writes on the grip portion of a writing instrument having such a grip structure, the grip portion has a double structure of a relatively hard upper grip cover 3 and a considerably soft lower grip cover 2. As a result, the fingertip comes in contact with the relatively hard upper grip cover 3 to provide a sense of security due to the resistance of the fingertip. On the other hand, the elasticity of the soft lower grip cover 2 acts via the upper grip cover 3 so that it is longer. There is the advantage that you do not get tired even if you write for a while.
[0015]
4 and 5 show a grip structure of a writing instrument according to Embodiment 2 of the present invention, in which the upper grip cover is formed of a transparent or translucent material. In this case, the lower grip cover 2 may be opaque. The grip portion of the barrel 1 has a plurality of ribs 13 provided on the outer periphery thereof at equal intervals in the longitudinal direction. In this case, when the grip portion is gripped, the unevenness due to the ribs 13 of the grip portion of the barrel 1 is felt by the hand, which is painful. In the present invention, the pain is reduced by putting the upper grip cover 3 on, and the hand is gripped. There is an advantage that the rib 13 can be seen three-dimensionally through the rib.
[0016]
In other words, since the upper grip cover is transparent, the contour of the rib 13 of the barrel 1 is an axial line as shown by a dotted line in FIG. There is an advantage that can be. The height of the rib 13 at the grip portion of the barrel 1 is sufficiently longer than the gap between the top surface of the rib 13 and the inner wall surface of the upper grip 3. For example, the height of the rib 13 is twice or more the gap. If it is set to be three-dimensional, a more effective aesthetic appearance can be obtained.
[0017]
6 and 7 show a grip structure of a writing instrument according to Embodiment 3 of the present invention. In this case, the cross section of the shaft cylinder 1 has a flat structure in which the connecting portion 15 of the concave arc 14 whose outer periphery is continuous is cut. Accordingly, a pattern shown by a dotted line in FIG. 6 actually appears on the surface.
[0018]
8 and 9 show a grip structure of a writing instrument according to Embodiment 4 of the present invention. In this case, the cross section of the shaft cylinder 1 has a structure in which the outer periphery is a continuous arc 16. Therefore, a pattern shown by a dotted line in FIG. 8 actually appears on the surface.
[0019]
10 and 11 show a grip structure of a writing instrument according to Embodiment 5 of the present invention. In this case, the cross section of the shaft cylinder 1 is a polygon (a dodecagon) 17 at its outer periphery. Accordingly, a pattern shown by a dotted line in FIG. 10 actually appears on the surface.
[0020]
12 and 13 show a gripping structure of a writing instrument according to Embodiment 6 of the present invention. In this case, the cross section of the shaft cylinder 1 has a structure in which the outer periphery is formed of three arcs 18 and their connecting portions 19 are cut to be flat. Accordingly, a pattern shown by a dotted line in FIG. 12 actually appears on the surface.
[0021]
14 and 15 show a grip structure of a writing instrument according to Embodiment 7 of the present invention. In this case, the outer shape of the cross section of the barrel 1 is a continuous concave arc 20. Therefore, a pattern shown by a dotted line in FIG. 14 actually appears on the surface.
[0022]
16 and 17 show a grip structure of a writing instrument according to Embodiment 8 of the present invention. In this case, the outer periphery of the barrel 1 has a structure in which projections 21 having a so-called warp shape are uniformly arranged. Therefore, a pattern shown by a dotted line in FIG. 16 actually appears on the surface.
[0023]
18 and 19 show a grip structure of a writing instrument according to Embodiment 9 of the present invention. In this case, the outer periphery of the barrel 1 has a structure in which horizontal ribs 22 are formed at equal intervals in the width direction. Therefore, a pattern shown by a dotted line in FIG. 18 actually appears on the surface.
[0024]
20 and 21 show a grip structure of a writing instrument according to Embodiment 10 of the present invention. In this case, the outer periphery of the barrel 1 has a structure in which letters 23 of A, B, and C are embossed. Accordingly, alphabetic characters shown by dotted lines in FIG. 20 actually appear on the surface.
[0025]
22 and 23 show a grip structure of a writing instrument according to Embodiment 11 of the present invention. In this case, the longitudinal section of the barrel 1 has a flat structure by cutting the connecting portion 25 of the concave arc 24 that is continuous in the longitudinal direction. Accordingly, a pattern shown by a dotted line in FIG. 22 actually appears on the surface.
[0026]
In the present invention, the barrel and the lower grip cover are formed by simultaneous molding. However, any molding method such as an injection molding method or an extrusion molding method may be used. Further, the grip structure of the present invention can be used not only for writing instruments but also for electronic pens for operating an electronic screen, stick-shaped cosmetics, paint brushes provided with processing tips, jewelry tools, and the like.
[0027]
【The invention's effect】
Since the present invention has the configuration as described above, it has an effect of fitting to the writer's fingertip, preventing fatigue due to long-time writing, and obtaining comfortable writing.
[0028]
Further, according to the present invention, a grip structure having a low hardness can be easily formed by simultaneous molding with the shaft cylinder, and the manufacturing is simplified, resulting in a reduction in cost and a good close contact alignment. There is also an effect that can be obtained.
[0029]
According to this invention, since the grip cover has a double structure and the upper grip cover is transparent to make the shape, pattern, or color of the outer periphery of the shaft cylinder, that is, the pattern, the character, the picture, etc. visible from the outside, A three-dimensional design can be enjoyed in the grip part, and there is also an aesthetically superior effect.
[Brief description of the drawings]
FIG. 1 is a partial longitudinal sectional view of a grip of a writing instrument according to Embodiment 1 of the present invention.
FIG. 2 is a cross-sectional view taken along line AA of FIG.
FIG. 3 is a longitudinal sectional view of FIG.
FIG. 4 is a partial longitudinal sectional view of a grip of a writing instrument according to Embodiment 2 of the present invention.
FIG. 5 is a transverse sectional view taken along line BB of FIG. 4;
FIG. 6 is a partial longitudinal sectional view of a grip of a writing instrument according to Embodiment 3 of the present invention.
FIG. 7 is a cross-sectional view taken along line CC of FIG. 6;
FIG. 8 is a partial longitudinal sectional view of a grip of a writing instrument according to Embodiment 4 of the present invention.
FIG. 9 is a transverse sectional view taken along line DD of FIG. 8;
FIG. 10 is a partial longitudinal sectional view of a grip of a writing instrument according to Embodiment 5 of the present invention.
FIG. 11 is a transverse sectional view taken along line EE of FIG. 10;
FIG. 12 is a partial longitudinal sectional view of a grip of a writing instrument according to Embodiment 6 of the present invention.
FIG. 13 is a transverse sectional view taken along the line FF of FIG. 12;
FIG. 14 is a partial longitudinal sectional view of a grip of a writing instrument according to Embodiment 7 of the present invention.
FIG. 15 is a transverse sectional view taken along the line GG of FIG. 14;
FIG. 16 is a partial longitudinal sectional view of a grip of a writing instrument according to Embodiment 8 of the present invention.
FIG. 17 is a transverse sectional view taken along the line HH in FIG. 16;
FIG. 18 is a partial longitudinal sectional view of a grip of a writing instrument according to Embodiment 9 of the present invention.
FIG. 19 is a transverse sectional view taken along the line II of FIG. 18;
FIG. 20 is a partial longitudinal sectional view of a grip of a writing instrument according to Embodiment 10 of the present invention.
21 is a transverse sectional view taken along the line JJ of FIG. 20.
FIG. 22 is a partial longitudinal sectional view of a grip of a writing instrument according to Embodiment 11 of the present invention.
FIG. 23 is a transverse sectional view taken along the line KK of FIG. 22;
[Explanation of symbols]
1 Shaft cylinder 2 Lower grip cover 3 Upper grip cover

Claims (6)

In a gripping structure for a writing implement comprising a writing barrel and an upper and lower grip cover that covers at least a grip portion of the barrel, the hardness of the lower grip cover is made smaller than the hardness of the upper grip cover. A grip structure for a writing instrument, wherein at least the lower grip cover and the shaft cylinder are formed at the same time. The grip structure for a writing instrument according to claim 1, wherein the shaft barrel and the upper and lower grip covers are combined. The grip structure of a writing instrument according to claim 1, wherein the hardness of the upper grip cover is 30 degrees or more in Shore A hardness, and the hardness of the lower grip cover is 5 degrees or more and less than 30 degrees in Shore A hardness. 2. The grip structure of a writing instrument according to claim 1, wherein the thickness of the lower grip cover is larger than the thickness of the upper grip cover. The grip structure of a writing instrument according to claim 1, wherein the upper grip cover is transparent or translucent, and the shape, pattern, or color of the outer periphery of the grip portion of the barrel can be visually observed through the grip cover. 2. The gripping structure of a writing instrument according to claim 1, wherein a step is formed at both ends in the longitudinal direction defining a grip portion of the barrel, and at least a lower grip cover is arranged between the steps.

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