JP2005014530A - Shaft - Google Patents

Abstract

An object of the present invention is to provide a shaft body having a high durability and a good grip feeling in a grip portion provided with a plurality of protrusions so as to protrude in an outer peripheral direction on an outer surface of the grip portion.
In a shaft body in which at least elastic resin is provided on a grip portion of the shaft body, a plurality of annular protrusions projecting in an outer peripheral direction are provided on an outer surface of the grip portion, and a difference in height is partially provided on the annular protrusion. A provided shaft body.
[Selection] Figure 1

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shaft body in which an elastic resin is provided on at least a portion of the shaft body that is to be gripped. Examples of shafts include writing instruments such as mechanical pencils, ballpoint pens, correction pens, tools such as cutters, engraving swords, and drivers, input pens used in PDAs (personal digital assistance) and electronic notebooks, and bicycle handles. Etc.
[0002]
[Prior art]
Various inventions have been made in order to give the gripping portion effects such as slip prevention and ease of gripping. As the anti-slip material, a configuration (grip) in which an elastic resin such as silicone or elastomer is disposed in the grip portion is employed, and a grip portion that is easy to hold is formed by changing the shape and hardness of the elastic resin. In particular, in the shape, a plurality of plate-like protrusions projecting radially on the outer peripheral surface of the grip body are formed so as to gradually increase toward the front side (Patent Document 1), or on the outer surface of the grip body, An example is one in which a plurality of groups of protruding pieces protruding in the outer diameter direction that can be bent by a gripping force are provided apart from each other in the circumferential direction of the grip body (Patent Document 2). By forming protrusions in the radial direction on the outer peripheral portion in this way, a soft feel can be obtained even if the grip is made of a relatively hard material, and the gripped finger is locally deep on the grip surface. It sinks and the fingertips are difficult to slip.
[0003]
[Patent Document 1]
Japanese Patent No. 3121313 (Claim 1)
[Patent Document 2]
JP 2000-071674 A (Claim 1)
[Problem to solve the invention]
The plate-like protrusion described in Patent Document 1 is formed over the entire circumferential direction, and the plate-like protrusion protrudes in the outer diameter direction from the grip body. For this reason, the plate-like projections can fall and give a good feel when gripped, but the force that regulates the plate-like projections is weak, so even if the gripping force is released, the plate-like projections fall without being restored. There is a problem of being left. In addition, since the restoring force of the plate-like projections is further reduced by long-term use, there is a problem that the durability is poor. On the other hand, what was described in Patent Document 2 and provided with a plurality of groups of protruding pieces protruding in the outer diameter direction in the circumferential direction of the grip body is referred to as restoring force and durability of the protruding pieces. Although the problem has been solved in terms of point, there is a big difference in the difficulty of slipping between the part where the protruding piece part formed in the circumferential direction exists and the part where it does not exist, and it causes a sense of incongruity when writing was there.
[0004]
[Means for Solving the Problems]
The present invention has been made in view of the above problems, and in a shaft body in which at least an elastic resin is provided on a grip portion of the shaft body, a plurality of annular protrusions projecting in an outer peripheral direction on the outer surface of the grip portion. The gist is that a difference in height is partially provided in the annular protrusion.
[0005]
Hereinafter, the present invention will be described in detail. In the shaft body 1 (a writing instrument in the present embodiment) having a gripping portion, the gripping portion 2 is provided at least at a portion of the outer periphery of the shaft body 1 where the fingertip of the gripper contacts. The material of the shaft body 1 other than the grip portion 2 may be any material that can be formed of metal, resin, wood, stone, or the like, as long as the material forming the grip portion 2 has a strength capable of forming the shaft body 1. The shaft body itself can be formed of the material, and is not particularly limited. These materials may be one kind or a mixture of two or more kinds.
[0006]
As for the shape of the gripping part 2, a plurality of annular protrusions 3 projecting in the outer peripheral direction are provided on the outer surface of the gripping part 2, and at least one part where the heights of the protrusions are different is provided in some annular protrusions. That's fine. That is, the annular protrusion 3 is formed by a continuous protrusion of the high protrusion 3a and the low protrusion 3b. During normal writing, since three fingers are in contact with the gripping portion, providing three locations with different heights at equal intervals in the circumferential direction makes it easier for the fingertip to hit a location that is easy to grip. Further, the annular protrusions do not necessarily have to be parallel. It may be a ring-shaped protrusion that circulates in a wavy shape or a protrusion that is connected in a spiral shape instead of an annular shape. The height of the protrusions, the width of the protrusions, and the width between the protrusions are not particularly limited, but can be bent by a gripping force from a slight height and width of about 0.1 mm in a streak shape. The height and width can be up to 1 mm or more, and may be appropriately selected according to the touch and the presence / absence of a bending deformation function. Further, since it is a part touched by the fingertip, in order to enhance the anti-slip effect, the height of the protrusions close to the fingerprint, the width, the width between the protrusions, or the pitch of the ratio may be adopted.
[0007]
An elastic resin is used for the grip portion 2. Specific examples include acrylic resin, silicone resin, fluororesin, vinyl chloride, urethane resin, polyurethane resin, polyethylene resin, dimethyl silicone, methyl vinyl silicone, methyl phenyl vinyl silicone, methyl fluoroalkyl silicone (fluorosilicone). ), Fluoro-dimethyl copolymer silicone, urethane rubber, ethylene acrylic rubber, epichlorohydrin rubber, acrylic rubber, ethylene propylene rubber, chloroprene rubber, natural rubber, isoprene rubber, chlorinated polyethylene, nitrile rubber, styrene elastomer, olefin elastomer, An ester-based elastomer, a urethane-based elastomer, and the like can be given, but there is no particular limitation as long as the shape can be maintained. These resins may be one kind or a mixture of two or more kinds.
[0008]
These elastic resins provide powders, fine particles, and fine particles to improve functionality such as touch and fingertips, improved design such as coloring and patterns, antibacterial and sweat absorption and release, and self-cleaning by photocatalytic reactions. A foaming agent or the like may be included.
Specific examples of the powder include resin powder such as styrene, nylon, polyolefin, silicone, epoxy, polymethyl methacrylate, inorganic powder such as silica, alumina, zirconia, glass piece, metal piece, silk powder, Examples include powdered natural materials such as wood flour and cork flour. In addition, composite powders obtained by coating these powders with powder coatings such as acrylic, urethane, and epoxy resins, and resin powders using automatic mortars, ball mills, jet mills, atomizers, hybridizers, etc. Examples include those in which an inorganic powder smaller than the resin powder is adsorbed or driven into the body, and is not particularly limited. Further, the shape of the powder may be amorphous, spherical, plate-like, or needle-like, and is not particularly limited. These powders may be added alone or in combination.
[0009]
Specific examples of the fine particles include carbon black, graphite, oxides such as titanium oxide, tin oxide, and indium oxide, nitrides such as titanium nitride, chromium nitride, zirconium nitride, and tantalum nitride, titanium carbide, and zirconium carbide. , Carbides such as tantalum carbide, and borides such as titanium boride, zirconium boride, and tantalum boride. Further, the shape of the fine particles may be amorphous, scaly, spherical or fibrous. One kind or two or more kinds of these fine particles may be added.
[0010]
As the foaming agent, a chemical foaming agent, a physical foaming agent, a thermally expandable microcapsule, or the like is used.
Specific examples of the chemical foaming agent include organic pyrolytic foaming agents such as azo compounds, nitroso compounds, hydrazine derivatives, semicarbazide compounds, azide compounds, and triazole compounds, organic reactive foaming agents such as isocyanate compounds, bicarbonates, Examples include inorganic pyrolytic foaming agents such as carbonates, sulfites, and hydrides, and inorganic reactive foaming agents such as sodium bicarbonate + acid, hydrogen peroxide + yeast bacteria, zinc powder + acids, and the like.
Specific examples of the physical foaming agent include butane, pentane, hexane, dichloroethane, dichloromethane, chlorofluorocarbon, air, carbon dioxide gas, nitrogen gas and the like.
Specific examples of thermally expandable microcapsules are thermoplastics composed of copolymers of vinylidene chloride, acrylonitrile, acrylate esters, methacrylate esters, etc., with low-boiling hydrocarbons such as isobutane, pentane, petroleum ether, and hexane as the core material. A microcapsule using a resin as a wall material can be used and is not particularly limited. You may add these foaming agents 1 type, or 2 or more types.
[0011]
In addition, the elastic resin in this embodiment contains a substance that generates negative ions. Substances that generate negative ions include natural minerals and radioactive substances that emit a trace amount of radiation. Examples of natural minerals include tourmaline (tourmaline), diatomaceous earth, components of ancient marine mineral layers, and sintered bodies thereof. Examples of radioactive substances that emit a trace amount of radiation include zircon, moznaite, bustness stone, and sintered bodies thereof.
Natural minerals and radioactive materials are said to have a smaller particle size and increase the amount of negative ions as the surface area increases. Therefore, the particle diameter of the natural mineral or radioactive substance contained in the elastic resin of the present invention is preferably 0.01 to 100 μm, more preferably 0.1 to 10 μm, considering the moldability and durability of the elastic resin. .
In addition, with the increase in the content of natural minerals and radioactive materials, the amount of negative ions generated is also expected to increase. Therefore, the content of the natural mineral or radioactive substance contained in the elastic resin of the present invention is preferably 0.01 to 100 parts by weight, more preferably 100 parts by weight of the resin, considering the moldability and durability of the elastic resin. Is 1 to 50 parts by weight.
In addition, the shape of the natural mineral or radioactive substance may be amorphous, spherical, plate-like, or needle-like, and is not particularly limited.
[0012]
The hardness of the elastic resin constituting the gripping part may be appropriately selected within a hardness range from 10 degrees to 90 degrees, and is not particularly limited. However, the hardness of the elastic resin that comes into contact with the human body is 20 degrees or less, and there is a problem that the surface is so sticky that it is difficult to grip, the dust is likely to adhere and the removal of the dust is difficult, and the hardness is 80 degrees. With the above elastic resin, the grip feel becomes hard and an appropriate grip feeling cannot be obtained. Therefore, the hardness is desirably in the range of 20 degrees or more and 80 degrees or less.
[0013]
As a manufacturing method of the grip part 3, a method of attaching an elastic resin formed by a method such as compression molding, lance transfer molding, injection molding, extrusion molding, or vacuum casting to a shaft body, or a method of forming by insert molding is given. However, the manufacturing method is not particularly limited.
[0014]
【Example】
Hereinafter, the present invention will be described more specifically with reference to examples.
<Example 1> 20 parts by weight of diatomaceous earth fine particles (average particle size: 5 μm) are kneaded with 100 parts by weight of dimethyl silicone rubber (GE Toshiba Silicone Co., Ltd., TSE2570-6U, rubber hardness 30 °), and injection molding is performed. The grip part 1 was molded. The grip portion 2 is provided with a plurality of annular protrusions 3 projecting in the outer circumferential direction, and the AA cross-sectional view taken along the cross section parallel to the annular protrusion has different protrusion heights (high protrusions). Three portions 3a and low protrusions 3b) are provided. (See FIGS. 2 and 3) The width of the annular protrusion 3 and the width between the protrusions are 0.4 mm, the height of the protrusion 3a at the high part is 0.5 mm, and the height of the protrusion 3b at the low part is 0. 0. 3 mm. The grip portion 2 was attached to the shaft body 1 (writing instrument). (FIG. 1) When the obtained writing instrument is gripped, the protruding portion 3a at the high part is bent by the gripping force, but it is not excessively bent due to the protruding portion 3b at the low part, and the finger feels during writing. It was good. Since the protrusion 3b at the lower part is also bent slightly by the gripping force, the force is dispersed, no extra force is applied, and the durability of the annular protrusion is improved. It was also confirmed that negative ions were generated when deformed by external forces such as bending, friction, and pressure.
[0015]
<Example 2> 20 parts by weight of tourmaline fine particles (average particle diameter: 3 μm) are kneaded with 100 parts by weight of dimethyl silicone rubber (GE Toshiba Silicone Co., Ltd., TSE2570-6U, rubber hardness 50 °), and injection molding is performed. The grip part 2 was molded. The grip portion 2 is provided with a plurality of annular protrusions 3 projecting in the outer circumferential direction, and the AA cross-sectional view taken along the cross-section parallel to the annular protrusion 3 has different protrusion heights (high Three protrusions 3a and low protrusions 3b) are provided. The width of the annular protrusion and the width between the protrusions are 0.4 mm, the height of the protrusion 3a at the high part is 0.3 mm, and the height of the protrusion 3b at the low part is 0.1 mm. The grip portion 2 was attached to the shaft body 1 (writing instrument). When the obtained writing instrument was gripped, the high protrusion 3a portion was slightly bent by the gripping force, but because of the low protrusion 3b, it was not excessively bent and the finger feeling during writing was good. Since it is a low protrusion 3b annular protrusion, the anti-slip effect is sufficiently exhibited, no extra force is applied, and the durability of the annular protrusion is improved. It was also confirmed that negative ions were generated when deformed by external forces such as bending, friction, and pressure.
[0016]
<Example 3> The grip portion 2 was molded by injection molding using dimethyl silicone rubber (GE Toshiba Silicone Co., Ltd., TSE2570-6U, rubber hardness 50 °). The grip portion 2 is provided with a plurality of annular protrusions 3 projecting in the outer circumferential direction, and the AA cross-sectional view taken along the cross-section parallel to the annular protrusion 3 has different protrusion heights (high Five protrusions 3a and low protrusions 3b) are provided. The width of the annular protrusion 3 and the width between the protrusions are 0.5 mm, the height of the protrusion 3 a at the high part is 0.5 mm, and the height of the protrusion 3 b at the low part is 0.1 mm. The grip portion 2 was attached to the shaft body 1 (writing instrument). When the obtained writing instrument was gripped, the high protrusions 3a were bent by the gripping force, and because of the low protrusions 3b, they were not excessively bent and the finger feel during writing was good. Moreover, since it was the low protrusion 3b annular protrusion, the anti-slip effect was fully exhibited, no extra force was applied, and the durability of the annular protrusion was improved.
As described above, in the first to third embodiments, the convex portion is formed in the outer diameter contour without forming the concave and convex shapes, and the protruding portion is formed with the high portion and the protruding portion with the low portion. In this way, the protrusion 3 may have the same inner diameter, and the outer diameter contour may be formed with a high protrusion 3b and a low protrusion 3a.
[0017]
<Comparative example 1> The holding | gripping part 2 was shape | molded by injection molding using the dimethyl-type silicone rubber (The product made by GE Toshiba Silicone Co., Ltd., TSE2570-6U, rubber hardness 30 degrees). The grip portion 2 is provided with a plurality of annular protrusions 3 protruding in the outer peripheral direction. The width of the annular protrusion 3 and the width between the protrusions are 0.4 mm, and the protrusion height is 0.5 mm. The grip portion 2 was attached to the shaft body 1 (writing instrument). When the obtained writing instrument was gripped, the portion with a protrusion height of 0.5 mm was bent with a gripping force, and the finger feel at the time of writing was good, but because it was bent too much, extra force entered, The durability of the annular protrusion 3 was also low. In addition, no negative ions were generated when it was deformed by an external force such as bending, friction, or pressure due to gripping.
[0018]
<Comparative example 2> The holding part 1 was shape | molded by injection molding using dimethyl-type silicone rubber (GE Toshiba Silicones Co., Ltd. make, TSE2570-6U, rubber hardness 30 degrees). The grip portion 2 is provided with a plurality of annular protrusions 3 protruding in the outer peripheral direction. The width of the annular protrusion 3 and the width between the protrusions are 0.4 mm, and the protrusion height is 0.1 mm. The grip portion 2 was attached to the shaft body 1 (writing instrument). When the obtained writing instrument was gripped, the portion having a protrusion height of 0.1 mm exhibited a non-slip effect, but it was felt that the finger feel at the time of writing was hard. In addition, when the pen pressure was increased and the hand was held strongly, there were problems such as the finger becoming painful. In addition, no negative ions were generated when it was deformed by an external force such as bending, friction, or pressure due to gripping.
[0019]
【The invention's effect】
As described above in the embodiment, the present invention provides a shaft body in which at least an elastic resin is provided on the grip portion of the shaft body, and a plurality of annular protrusions that project in the outer circumferential direction are provided on the outer surface of the grip portion. Since the annular protrusion is partially provided with a height difference, a comfortable grip feeling can be obtained, and excessive bending of the annular protrusion can be suppressed to improve durability. It has also been confirmed that by containing a substance that generates negative ions in the elastic resin, negative ions are generated when the elastic resin is deformed by an external force such as bending, friction, and pressure.
[Brief description of the drawings]
FIG. 1 is an external view showing the present invention.
FIG. 2 is an external view of a gripping part showing the present invention.
3 is a cross-sectional view taken along line AA in FIG.
FIG. 4 is a view corresponding to FIG. 3, showing another example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shaft body 2 Holding part 3 Annular protrusion 3a High protrusion 3b Low protrusion

Claims (6)

In the shaft body in which at least elastic resin is provided in the grip portion of the shaft body, a plurality of annular protrusions projecting in the outer peripheral direction are provided on the outer surface of the grip portion, and a difference in height is partially provided in the annular protrusion. Characteristic shaft body. The shaft body according to claim 1, wherein the plurality of annular protrusions are provided in parallel. The shaft body according to claim 1, wherein a part or the entire circumference of the annular protrusion can be bent by gripping. The shaft body according to any one of claims 1 to 3, wherein the elastic resin contains a substance that generates negative ions. The shaft body according to claim 4, wherein the substance that generates negative ions is tourmaline, or one, two, or three kinds of mixtures selected from diatomaceous earth or radioactive substances. The shaft body according to claim 1, wherein the shaft body is a writing instrument.

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