JP2009241471A - Shaft body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that a gripping part of a shaft body internally sealing a flexible material, a gelatinous substance or a gas becomes deformed in its own way and therefore, is not resilient and excessively soft to give a user an uncomfortable writing feel, and even if a sturdy gripping part having fine solid bodies arranged in the space is employed, further improvement is still required to satisfy personal favorite touch. <P>SOLUTION: The shaft body is provided with or is formed integrally with the gripping part having a space formed inside and filled with fine solid bodies and/or auxiliary material, and is further provided with a means for changing the volume of the space having fine solid bodies and/or viscous material inserted therein. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a shaft body provided with a grip portion. Examples of the shaft body include writing tools such as ballpoint pens and mechanical pencils, elongated containers such as lipsticks and eyeliners, tools such as fishing rods, door knobs, and drivers. Kind.

Various inventions have been made in order to provide the gripping portion with effects such as slip prevention and ease of gripping. As a non-slip material, a structure (grip) in which an elastic resin such as silicone or elastomer is arranged in the gripping part is adopted, and a flexible material, gel-like substance, gas, or fine solid is enclosed inside the gripping part. The grip part which is easy to hold is formed.
Japanese Patent No. 3431317 Japanese Patent Laid-Open No. 2005-199594

  However, there is a drawback in that the gripping portion in which a flexible material, gel-like substance, or gas is sealed is arbitrarily deformed, so that it is not soft and is too soft. Moreover, even when a fine solid is placed in the space and the grip is a waist, there is still room for further improvement to compensate for individual differences in the tactile sensation.

  Therefore, the present invention provides a space inside the gripping portion of the shaft body, and in the shaft body in which the gripping portion in which the fine solid and / or the auxiliary material is arranged and / or integrally provided in this space, The gist of the shaft body is characterized in that a means for changing the space volume in which the viscous material is arranged is provided, and the tactile sensation of the grip portion is changed.

  The material of the shaft body 1 may be any material that can form metal, resin, wood, stone, and the like. If the material forming the grip portion 2 has sufficient strength to form the shaft body 1, the grip portion is made of that material. Can be formed on the shaft body itself, and is not particularly limited. These materials may be one kind or a mixture of two or more kinds.

  Examples of the material of the shaft body 1 and / or the grip portion 2 include resin and / or elastic resin. As the resin, polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), polyethylene resin (PE), polypropylene resin (PP), polystyrene resin (PS), acrylonitrile styrene resin (AS), acrylonitrile styrene butadiene resin (ABS), Methacrylic resin (PMMA), polyacetal resin (POM), polyamide resin (PA), polycarbonate resin (PC), polyethylene terephthalate resin (PET), tetrafluoroethylene resin (PTFE), acrylic resin and silicone resin as elastic resin , Fluorine resin, vinyl chloride, urethane resin, polyurethane resin, polyethylene resin, elastomer gel, polyethylene gel, 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 elastomers, olefin elastomers, ester elastomers, urethane elastomers and the like, but are not particularly limited as long as the shape can be maintained. These resins and / or elastic resins may be one kind or a mixture of two or more kinds. In addition, it is possible to improve the anti-slip effect and the grip feeling by molding and painting an elastic resin on the surface of the grip portion formed of resin.

  The hardness of the elastic resin constituting the gripping portion may be appropriately selected within a hardness range of 0 to 90 degrees for Shore A or 0 to 90 degrees for Asker C, and is not particularly limited. However, an elastic resin of 60 degrees or less on Shore A and 80 degrees or more on Asker C becomes hard and less sticky or swells on the surface. Therefore, it is an elastic resin of 60 degrees or less on Shore A and 80 degrees or less on Asker C. It is desirable. Further, the inner layer and the outer layer may be molded integrally with the same material or may be molded and assembled separately with materials having different hardness, and are not particularly limited.

  A substance having oil absorption and / or water absorption may be added to these resins and / or elastic resins. There are many types and shapes of oil-absorbing and / or water-absorbing substances, such as substances used in cosmetics, substances used for removing oil, and substances used for deodorization and cleaning in the home. is there. For example, natural materials such as wood, fiber, cork, charcoal and leather, adsorbent materials such as silica gel and activated carbon, inorganic minerals such as zeolite and diatomaceous earth, crosslinked polyacrylate, crosslinked polymethyl methacrylate, polyamide porous material Polymer oil absorbing / water absorbing agents such as spindle-shaped hollow porous silica, porous silica, porous silicone, calcium carbonate and magnesium carbonate, and porous ceramics. In addition, an oil absorbing property and / or a water absorbing function such as porous silica may be formed on the surface to exhibit and improve the oil absorbing property and / or water absorbing function of the substance. Inorganic minerals and inorganic compounds are particularly preferred because it is desirable that the size of these oil-absorbing and / or water-absorbing substances does not change upon oil absorption and / or water absorption. These oil-absorbing and / or water-absorbing substances may be one kind or a mixture of two or more kinds.

  A substance having oil absorption and / or water absorption is desirably added as fine particle powder in order to sufficiently exert its function. As the particle size is finer, the surface area per unit weight increases, so that an effect of increasing the absorption efficiency of oil and / or water can be expected. However, the particle size may be appropriately selected according to the shape and size of the gripping part. Further, by using an inorganic powder having oil absorption and / or water absorption, there is no change in volume even when oil and / or water is absorbed, and swelling and loosening of the gripping portion can be further prevented. The amount added to the resin may be appropriately selected according to the shape and size of the gripping part, but if the amount added is too small, a sufficient effect cannot be expected, and if it is too large, the strength is impaired. Therefore, it is desirable that the added amount is 0.001% to 50%, particularly 0.01% to 10% by weight. The addition amount to the elastic resin may be appropriately selected according to the shape and size of the gripping portion, but if the addition amount is too small, a sufficient effect cannot be expected, and if it is too large, the hardness of the elastic resin increases and elasticity is increased. Therefore, it is desirable that the addition amount is 0.001% to 50%, particularly 0.01% to 10% by weight with respect to the elastic resin.

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. In addition, 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.

  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.

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 thereof 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, and nitrogen gas.
Specific examples of thermally expandable microcapsules are thermoplastics composed of copolymers of vinylidene chloride, acrylonitrile, acrylic acid esters, methacrylic acid 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.

  Further, the surface of the elastic resin constituting the grip portion can be formed into a smooth surface or a rough surface. To increase the frictional resistance and improve the fingertip surface catching, the surface should be smooth like a mirror surface. To reduce the frictional resistance and make it less susceptible to tactile sensation, dust and dirt, roughen the surface. Good. Furthermore, moderate unevenness may be formed on the surface of the elastic resin constituting the gripping portion.

  The gripping portion has a structure in which a space is provided inside by providing at least an inner layer and an outer layer. Further, the inner layer and the outer layer may be integrated or separate, and a structure in which a part of the inner layer and the outer layer are connected may be used. In the radial cross section of the shaft body, R is the shortest distance between the inner layer and the outer layer of the grip portion.

  As a manufacturing method of the grip part 2, a method of attaching an elastic resin formed by a method such as compression molding, transfer molding, injection molding, extrusion molding or vacuum casting to a shaft body, or a method of forming by insert molding may be mentioned. However, the manufacturing method is not particularly limited.

  The fine solid 4 is disposed between the shaft body and the grip portion and / or in a space provided in the grip portion. Specific examples of the fine solid 4 include hard balls such as stainless steel, white and white, zirconia and ruby balls, ores such as diamond, ruby, sapphire, agate and quartz, rocks such as granite and marble, polyethylene, polyethylene terephthalate , Vinyl chloride, ABS, AS, PMMA, polypropylene, polycarbonate and other resins and their foams, acrylic resin, silicone resin, fluororesin, urethane resin, polyurethane 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, ester elastomer, urethane elastomer and other elastic resins, nylon, silk, cotton and other fibers, glass, etc. There is no particular limitation as long as it can be formed. These fine solids may be one kind or a mixture of two or more kinds.

  As the shape of the fine solid 4, various shapes of solid such as particles, fibers, and irregular shapes can be used. When a fine solid having a shape close to a true sphere, such as a hard sphere, is arranged, the deformation is fast when gripped, and the shape is restored quickly when released. When an irregularly shaped fine solid obtained by pulverizing rocks or glass is arranged, the gripping is slow, but there is a feeling of gripping, and the shape is remembered to some extent when released. The size of the fine solid is the cross section in the radial direction of the shaft body, where the shortest distance r between the inner layer and the outer layer of the gripping part is R, the shortest diameter r of the fine solid is a coefficient A of r = AR 0 <a ≦ Those satisfying the condition of 0.8 are desirable. Further, the size of these fine solids may be one kind or a mixture of two or more kinds.

  In addition to the fine solid 4 in the space provided between the shaft body and the grip part and / or inside the grip part, an elastic resin or gel-like substance is used to assist the fluidity and shape retention of the fine solid. Or auxiliary materials such as viscous materials may be provided. Examples of viscous materials include silicone oils such as KF96 (manufactured by Shin-Etsu Chemical Co., Ltd.), silicone oil compounds such as tsk5370 (manufactured by Ge Toshiba Silicone), and petroleum-based oils such as Retinax Grease CL (manufactured by Showa Shell Sekiyu KK). Grease. Examples of gel-like substances include silicone gels such as KE-1052, sifel 827 (manufactured by Shin-Etsu Chemical Co., Ltd.), alpha gel (manufactured by Geltech Co., Ltd.), and urethane gels such as human skin gel (manufactured by EXCIAL Corporation) Can be given. These auxiliary materials may be one kind or a mixture of two or more kinds.

  As a means for changing the space volume in which fine solids and / or viscous materials are arranged, an annular member having the same shape as the space cross-sectional shape that moves back and forth with respect to the axial direction of the space is arranged in the space, and the annular member For example, a method of changing the space volume in which fine solids and / or auxiliary materials are arranged by moving the above, a method of arranging an annular member smaller than the outer diameter of the outer layer on the outer periphery of the outer layer, and moving the annular member. Moreover, you may provide locations other than the part to hold | grip, for example, the location which changes space volume inside a shaft body. The method is not particularly limited as long as the space volume in which the fine solid and / or the auxiliary material is arranged can be changed.

  In the present invention, a space is provided inside the gripping portion, and the gripping portion in which fine solids and / or auxiliary materials are arranged in this space is arranged and / or integrally provided. In addition, the gripping portion has a lower waist than the gripping portion in which only a flexible material, a gel-like substance or gas is enclosed. Furthermore, by providing a means for changing the space volume in which the fine solid and / or auxiliary material is arranged, the density of the fine solid and / or viscous material can be adjusted, and the tactile sensation of the grip portion can be changed. It has become. When the space volume is increased, the density of the fine solid and / or the auxiliary material is decreased, and the hardness is reduced, so that the grip portion is easily deformed and a soft tactile feeling is obtained. On the contrary, if the space volume is narrowed, the density of the fine solid and / or the auxiliary material is increased and the hardness is increased, so that the grip portion is not easily deformed and a hard tactile sensation is obtained. That is, by providing a means for changing the space volume, the grip portion can be adjusted to a tactile feel that suits the user's preference.

  According to the present invention, in a shaft body in which a space is provided in the interior and a gripping portion in which a fine solid and / or auxiliary material is arranged is arranged and / or integrally provided, the fine solid and / or auxiliary material is arranged. The main feature is to change the tactile sensation of the gripping portion by providing means for changing the spatial volume. The purpose of adjusting to the desired tactile sensation was realized in the gripping part that deforms according to the shape of the gripped fingertip and holds the shape.

FIG. 1 is a diagram of Example 1 in which the present invention is used for a grip portion of a writing instrument. FIG. 2 is a diagram in which the internal space volume of FIG. 1 is changed. A space was provided inside by providing an inner layer and an outer layer, and fine solids and auxiliary materials were arranged in this space. Reference numeral 1 is a shaft body, reference numeral 2 is a gripping part, reference numeral 3 is an outer layer of the gripping part, reference numeral 4 is a fine solid, reference numeral 5 is an auxiliary material, reference numeral 6 is a cylindrical space volume changing component, reference Reference numeral 8 denotes a space.
A male screw portion 1 a is formed on the rear outer periphery of the shaft body 1, and a female screw portion 6 a formed on the inner peripheral surface of the space volume changing component 6 is screwed into the male screw portion 1 a. That is, the shaft body 1 and the space volume changing component 6 are fixed by screwing, but can be moved back and forth by relatively rotating each other. By moving the space volume changing component 6 back and forth, the volume of the internal space 8 provided in the grip portion 2 is changed. Furthermore, since the space volume changing component 6 is a cylindrical member whose inner surface on the front is enlarged in diameter toward the front, the deformation of the outer layer 3 of the grip portion 2 can easily follow.
Here, when the space volume changing component 6 is moved to the end, the internal space volume is maximized, and the density of the fine solid 4 and the auxiliary material 5 disposed in the space 8 is minimized, so that it is the softest. It becomes the grip part 2. Further, when the space volume changing component 6 is moved forward, the internal space volume is gradually reduced, and the density of the fine solid 4 and the auxiliary material 5 arranged in the space 8 is increased. It becomes.

  The shaft cylinder 1 was formed by injection molding using polyethylene and an elastomer (Actimer AE-2060S, manufactured by Riken Technos Co., Ltd., Shore A hardness: 60 °) as the grip portion 2. Glass beads (Unibead UB-2022L, manufactured by Union Co., Ltd.) are arranged as fine solid 5 in the space between the inner layer and outer layer, and silicone gel (KE-1052, manufactured by Shin-Etsu Chemical Co., Ltd.) is filled in the gap. The grip portion 2 was attached to the shaft body 1. The grip portion 2 is deformed into the shape of a gripped finger, and exhibits effects such as ease of holding and difficulty in sliding. The inner glass beads themselves are hard, so that a good, firm feel can be obtained that does not deform too much when grasped firmly. Further, the internal volume can be adjusted by rotating the space volume changing component 6, and the volume is small in the state of FIG. 2, and there is no change in the number of internal glass beads and the weight of the silicone gel. Since the density in the space is increased, the touch is harder than that in the state of FIG.

FIG. 3 is a diagram of Example 2 in which the present invention is used for a grip portion of a writing instrument. FIG. 4 is a diagram in which the internal space volume of FIG. 3 is changed. A space was provided inside, and fine solids and auxiliary materials were placed in this space. Ring-shaped space volume changing parts that can be moved back and forth are arranged in front and rear of the gripping part. Reference numeral 1 is a shaft, reference numeral 2 is a gripping part, reference numeral 3 is an outer layer of the gripping part, reference numeral 4 is a fine solid, reference numeral 5 is an auxiliary material, reference numeral 6 is a ring-shaped space volume changing component, reference Reference numeral 8 denotes a space portion.
The ring-shaped space volume changing component 6 made of a rubber-like elastic body or the like is disposed in front of and behind the grip portion 2, and the inner diameter of the ring-shaped space volume changing component 6 is smaller than the outer diameter of the grip portion 2. Therefore, the space volume changing component 6 fastens the grip portion 2 and is fixed by a frictional resistance with the outer layer 3 of the grip portion 2. Since the cross section of the space volume changing component 6 is circular and has elasticity, it can be moved back and forth by sliding or rotating the outer peripheral surface of the grip portion 2. By moving the volume changing component 6 back and forth, the volume of the internal space 8 provided in the grip portion 2 is changed.
For example, when the space volume changing component 6 arranged at the front is moved to the forefront and the space volume changing component 6 arranged at the rear is moved to the rearmost, the internal space volume is maximized and arranged in the space 8. Since the density of the fine solid 4 and the auxiliary material 5 is minimized, the softest grip 2 is obtained. Further, when the space volume changing component 6 arranged in the front is moved rearward and the space volume changing component 6 arranged in the rear is moved forward, the internal space volume gradually decreases and is arranged in the space 8. Since the density of the fine solid 4 and the auxiliary material 5 increases, the hard grip portion 2 is obtained.

  The shaft cylinder 1 was formed by injection molding using acrylonitrile styrene butadiene and an elastomer (Lavalon MJ6301C, manufactured by Mitsubishi Chemical Corporation, Shore A hardness: 60 degrees) as the grip portion 2. Glass beads (Unibeads UB-1719LN, manufactured by Union Co., Ltd.) are arranged as a fine solid 5 in the space between the shaft tube 1 and the grip portion 2, and silicone gel (SYLGARD 527, Toray Dow Corning Co., Ltd.) is placed in the gap. The grip portion 2 filled with the product was attached to the shaft body 1. The space volume changing component 6 is formed by compression molding with silicone rubber (manufactured by GE Toshiba Silicone Co., Ltd., TSE2570-6U, rubber hardness 30 °), and the expanded diameter is passed through the gripping portion to release the expanded diameter. Thus, the gripping part is in a tightened state. The grip portion 2 is deformed into the shape of a gripped finger, and exhibits effects such as ease of holding and difficulty in sliding. The inner glass beads themselves are hard and elastic due to the silicone gel, so that they do not deform too much when grasped firmly, and a good feeling with a waist is obtained. Furthermore, the internal space volume can be adjusted by moving the space volume changing component 6, and the volume is small in the state of FIG. 4, and there is no change in the number of internal glass beads or the weight of the silicone gel. Since the density in the space is increased, the touch is harder than that in the state of FIG.

FIG. 5 is a diagram of Example 3 in which the present invention is used for a grip portion of a writing instrument. FIG. 6 is a diagram in which the internal space volume of FIG. 5 is changed. A space was provided inside by providing an inner layer and an outer layer, and a fine solid was disposed in this space. Reference numeral 1 is a shaft, reference numeral 2 is a gripping part, reference numeral 3 is a gripping part outer layer, reference numeral 4 is a fine solid, reference numeral 6 is a cylindrical space volume changing component, and reference numeral 7 is a cylindrical space. The volume adjustment ring, reference numeral 8 is a space.
A space volume changing component 6 that moves back and forth by the rotation of the space volume adjusting ring 7 is disposed behind the grip portion 2, and the space volume changing component 6 can be moved back and forth by rotating the space adjusting ring 7. did. This will be specifically described. A front end portion of the space volume changing component 6 having a front end portion having the same shape as the cross-sectional shape of the space 8 is inserted into the rear side of the space 8 of the gripping member 2. On the other hand, an annular convex portion 1b is formed on the rear outer periphery of the shaft body 1, and an annular concave portion 7a formed on the inner surface of the space volume adjusting ring 7 disposed behind the grip portion 2 on the annular convex portion 1b. Is inserted. The space volume adjusting ring 7 can be rotated in the radial direction with respect to the shaft body 1 by the fitting action of the annular convex portion 1b and the concave portion 7a, but cannot be moved back and forth.
Further, a male screw portion 7 b is formed inside the space volume adjusting ring 7, and a female screw portion 6 a that engages with the male screw portion 7 b is formed on the inner surface of the space volume changing component 6. That is, the space volume adjusting ring 7 and the space volume changing component 6 are fixed by screwing, but can be moved back and forth by relatively rotating each other. The front end portion of the space volume changing component 6 is press-fitted into the inner surface of the gripping member 2, so that there is no risk that the auxiliary member 5 or the like leaks from the sliding portion. It can move back and forth with respect to 2 but cannot rotate. By moving the space volume changing component 6 back and forth, the volume of the internal space 8 provided in the grip portion 2 is changed. For example, when the space volume changing component 6 is moved to the end, the internal space volume is maximized, and the density of the fine solids 4 arranged in the space 8 is minimized, so that the softest grip 2 is obtained. . Further, when the space volume changing component 6 is moved forward, the internal space volume gradually decreases, and the density of the fine solids 4 arranged in the space 8 increases, so that the hard grip portion 2 is obtained.

  The shaft cylinder 1 was formed by injection molding using polypropylene and an elastomer (Lavalon MJ6301C, manufactured by Mitsubishi Chemical Corporation, Shore A hardness: 60 degrees) as the grip portion 2. Glass beads (Unibead UB-1416LN, manufactured by Union Co., Ltd.) were arranged as fine solid 5 in the space between the inner layer and the outer layer, and silicone gel (SYLGARD 527, manufactured by Toray Dow Corning Co., Ltd.) was filled in the gap. The grip portion 2 was attached to the shaft body 1. The grip portion 2 is deformed into the shape of a gripped finger, and exhibits effects such as ease of holding and difficulty in sliding. The inner glass beads themselves are hard and elastic due to the silicone gel, so that they do not deform too much when grasped firmly, and a good feeling with a waist is obtained. The space volume changing component 6 can be moved back and forth by rotating the space volume adjusting ring 7 to adjust the internal space volume. In the state shown in FIG. Since there is no change, the density in the space increases, so that it has a harder tactile sensation than the state of FIG. Moreover, although there is no change in appearance by separating the space volume changing component 6 and the space volume adjusting ring 7, it is possible to adjust the hardness of the gripping portion.

FIG. 7 is a diagram of Example 4 in which the present invention is used for a grip portion of a writing instrument. FIG. 8 is a diagram in which the internal space volume of FIG. 7 is changed. A space was provided inside by providing an inner layer and an outer layer, and auxiliary materials were arranged in this space. A space volume changing component that moves back and forth by a slide is arranged behind the grip portion. Reference numeral 1 is a shaft, reference numeral 2 is a gripping part, reference numeral 3 is an outer layer of the gripping part, reference numeral 5 is an auxiliary material, reference numeral 6 is a space volume changing component, and reference numeral 8 is space.
The shaft body 1 is formed with a communication hole 1 c that communicates with the internal space 8 of the grip portion 2. The front end portion of the space volume changing component 6 having the same shape as the cross-sectional shape of the communication hole 1c at the front portion is inserted into the communication hole 1c. In addition, a protrusion 6 b for moving the space volume changing member 6 back and forth is formed at the rear end of the space volume changing component 6. The outer diameter of the protrusion is larger than the outer diameter of the grip portion 2 and protrudes from the outer diameter portion from the grip portion 2 and the shaft body 1. The space volume changing component 6 is inserted into a slit portion 9 provided behind the shaft body 1, and is fixed by a frictional resistance between the slit portion 9 and the space volume changing component 6. By moving the space volume changing component 6 back and forth, the volume of the internal space 8 provided in the grip portion 2 is changed. For example, when the space volume changing component 6 is moved to the end, the internal space volume is maximized, and the density of the auxiliary material 5 disposed in the space 8 is minimized, so that the grip portion 2 is the softest. Further, when the space volume changing component 6 is moved forward, the internal space volume gradually decreases, and the density of the auxiliary material 5 disposed in the space 8 increases, so that the hard grip portion 2 is obtained.

  The shaft cylinder 1 was formed by injection molding using polypropylene and an elastomer (Lavalon MJ6301C, manufactured by Mitsubishi Chemical Corporation, Shore A hardness: 60 degrees) as the grip portion 2. Silicone oil (KF96, manufactured by Shin-Etsu Chemical Co., Ltd.) was disposed as an auxiliary material 5 in the space between the inner layer and the outer layer, and the grip portion 2 was attached to the shaft body 1. The grip portion 2 is deformed into the shape of a gripped finger, and exhibits effects such as ease of holding and difficulty in sliding. By moving the space volume changing component 6 back and forth, the internal space volume can be adjusted. In the state of FIG. 8, the volume is small, and the weight of the internal silicone oil does not change, so the density in the space Rises to a harder tactile sensation than the state of FIG.

  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 held. Examples of shafts include writing instruments such as mechanical pencils, ballpoint pens, correction pens, tools such as cutters and engraving swords, drivers, input pens used in PDAs (personal digital assistance) and electronic notebooks, bicycle handles, etc. Wide range.

It is a figure of Example 1 which used this invention for the holding part of the writing instrument. It is a figure when the space volume of FIG. 1 is made small. 2 is a diagram of Example 2. FIG. It is a figure when the space volume of FIG. 3 is made small. 10 is a diagram of Example 3. FIG. It is a figure when the space volume of FIG. 5 is made small. FIG. 10 is a diagram of Example 4. It is a figure when the space volume of FIG. 7 is made small.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shaft body 2 Gripping part 3 Gripping part outer layer 4 Fine solid 5 Auxiliary material 6 Spatial volume change part 7 Spatial volume adjustment ring

Claims (2)

A space in which fine solids and / or viscous materials are arranged in a shaft body in which a space is provided and a gripping part in which fine solids and / or auxiliary materials are arranged is arranged and / or integrally provided in the space. A shaft characterized by providing means for changing the angle. 2. The shaft body according to claim 1, wherein the means for changing the volume is arranged to be movable back and forth with respect to the longitudinal direction of the shaft body.

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