JP2011126177A - Shaft body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that since a gripping section in which a flexible material, a gel-like substance or gas is enclosed is arbitrarily deformed, there is a defect that the gripping section does not have stiffness and is too soft, and writing feeling is no favorable, and also, in the case that the gripping section is formed into one having stiffness by arranging a fine solid body or a substance having viscosity in a space, pain or a feeling of incongruity is generated when the touching feeling of a shaft body inside is transmitted to a finger tip when being gripped, and therefore, a room for the further improvement remains. <P>SOLUTION: The space is formed between the shaft body 1 and the gripping section 2, or in the gripping section. In the space, the fine solid body 5 and/or the substance having viscosity are arranged. Furthermore, at least the cross section of the shaft body at a section which is covered with the gripping section is made into a different shape. Thus, a deformation amount when the gripping section 2 is gripped by changing a space width is regulated. At the same time, the touching feeling of the shaft body inside becomes difficult to be transmitted to the finger tip as the flat surface section of the shaft body having the different shape comes into contact with the finger when being gripped, and pain or the feeling of incongruity can be eliminated. <P>COPYRIGHT: (C)2011,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 give the gripping portion an effect such as slip prevention and easy 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 that is easy to hold is formed.
Japanese Patent No. 3431317 Japanese Patent Laid-Open No. 2005-199594

  However, the gripping part in which a flexible material, a gel-like substance, or a gas is enclosed in Patent Document 1 is arbitrarily deformed, so that there is a drawback that it is too soft and poor in writing feeling.

  Moreover, in patent document 2, although the fine solid is arranged in space and it is set as the holding | grip part with the waist, the tactile sensation of an internal shaft body is transmitted to a fingertip by deformation | transformation, and it led to the pain and discomfort.

  The object of the present invention is to make the gripping part easy to deform without being affected by the outer shape of the grip member and the outer shape of the gripping part of the shaft cylinder in view of the above problems, and thus the gripping feeling is good and the slip prevention is achieved. It is providing the axial cylinder of the writing instrument which an effect improves.

  The present invention provides a shaft body in which at least an elastic resin is disposed and / or integrally provided in the grip portion of the shaft body, and a space is provided between the shaft body and the grip portion or inside the grip portion, and a fine solid is formed in the space. In addition, the gist is that a substance having adhesiveness is arranged, and that the cross-section of the shaft body at least covered with the grip portion is modified.

  The present invention provides a space inside by providing an inner layer and an outer layer using a shaft body and / or a gripping portion, and a gripping portion in which a fine solid and / or a substance having adhesiveness is arranged and / or disposed in this space. Alternatively, by providing them integrally, the deforming ability is improved as compared with the conventional elastic resin-only gripping part, and the gripping part has a lower waist than the gripping part enclosing only a flexible material, gel-like substance or gas. . In addition, by making the cross section of the shaft body of the part covered with the grip part irregular, the distance between the inner layer and the outer layer of the grip part is partially changed, and the tactile sensation of the inner shaft body is transmitted to the fingertip due to deformation And the discomfort is eliminated. Also, it deforms according to the shape of the gripped fingertip and retains the shape, so the contact area increases, the gripping pressure is distributed, and the grip is held by placing it on the gripping part other than the fingertip, for example, the inter-finger joint of the writing instrument It becomes an easily shaped shaft.

It is a figure of Example 1 which used this invention for the holding part of the writing instrument. It is AA sectional drawing of FIG. It is a figure of Example 2 which used this invention for the holding part of the writing instrument. It is AA sectional drawing of FIG. It is a figure of Example 3 which used this invention for the holding part of the writing instrument. It is AA sectional drawing of FIG. It is a figure of Example 4 which used this invention for the holding part of the writing instrument. It is AA sectional drawing of FIG.

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

  Resin and / or elastic resin can be used as the material of the shaft body and / or the grip portion. Examples of the resin include polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), polyethylene resin (PE), polypropylene resin (PP), polystyrene resin (PS), acrylonitrile styrene resin (AS), and 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 or silicone as elastic resin Resin, fluororesin, 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 Examples of the elastomer include rubber, styrene elastomer, olefin elastomer, ester elastomer, and urethane elastomer. However, the shape is 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. Further, it is possible to improve the anti-slip effect and the grip feeling by a method in which an elastic resin is molded and coated on the surface of the grip portion molded with resin.

  The gripping portion has a structure in which a space is provided inside by providing at least an inner layer and an outer layer. The structure may be a structure in which the inner layer is a shaft body and the outer layer is a gripping part, and a gripping part is provided on the shaft body as an inner layer, and an outer layer of the gripping part is provided on the outer side to provide a space inside. . Further, the inner layer and the outer layer may be integrated or separated, and a structure in which a part of the inner layer and the outer layer are connected may be used.

  The cross section of the inner layer composed of the shaft body and the grip portion provided on the shaft body is irregular, and the distance from the outer layer having a circular cross section can be changed. In addition, if the cross section of the inner layer is circular and the cross section of the outer layer is irregular or the cross section of the inner layer and the cross section of the outer layer are irregular, the distance between the inner layer and the outer layer can be changed, but the outer shape is affected, It is desirable that the inner layer cross section is irregular and the outer layer cross section is circular. The range in which the cross section has an irregular shape is not limited as long as it is a part covered by the outer layer of the gripping part and / or a part of the covered part. The shape of the cross section may be selected as appropriate according to the positional relationship between the grip portion and the finger that holds it, and is not particularly limited. If the shaft section of the gripping part that is gripped by three fingers, the thumb, index finger, and middle finger, such as a writing instrument or lipstick, is triangular or hexagonal, the place where each finger comes into contact is a flat surface. The pain and discomfort felt when the tactile feel of the shaft is transmitted to the fingertips can be resolved. In addition, the gripping part that is gripped with five fingers, such as tools and door knobs, has a shaft section that follows an ellipse or grip shape, eliminating the pain and discomfort that is felt when the tactile feel of the inner shaft is transmitted to the fingertip. I can do it. Moreover, the shape of the cross section of the shaft body may be changed in the gripping portion, and it is only necessary to have a portion having an irregular shape even if the partial cross section is a cylinder. In addition, the distance between the inner layer and the outer layer of the grip portion may be partially changed by using a cylinder having a center different from that of the cylinder forming the grip portion outer layer as the inner layer.

  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. In addition, the hardness and thickness of the outer layer greatly affect the feeling of touch. When the outer layer is formed of an elastic resin of 60 degrees with Shore A and 80 degrees or less with Asker C, the outer layer is soft, so that the amount of deformation when gripped is large and the deformability is improved, and the retention of the deformed shape is also improved. On the other hand, since it is difficult to return to the original shape, the shape recoverability is reduced. On the other hand, since the elastic resin of 60 degrees on Shore A and 80 degrees or more on Asker C is hard, the amount of deformation when gripped is small and the deformability and deformed shape retention are reduced, but on the other hand, it returns to the original shape. The shape restoration property that is easy is improved. These deformability, deformed shape retainability, and shape recoverability include the elasticity of the elastic resin, the thickness of the outer layer, the size of the space provided inside the gripping part, the outer layer and the shaft, and / or the inner layer. It can be adjusted by the size of the space formed between the two. 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.

  It is desirable to add a substance having oil absorption and / or water absorption as a 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 the 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 added 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, you may form the recessed part and convex part which each have an appropriate area in the surface of the elastic resin which comprises a holding part.

  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 arranged between the shaft body and the grip part and / or in a space provided in the grip part. 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 varies depending on the size of the space, but is not particularly limited as long as it is smaller than the minimum width of the space. Further, the size of these fine solids may be one kind or a mixture of two or more kinds.

  An adhesive material may be disposed in a space provided between the shaft body and the gripping part and / or inside the gripping part and / or between the inner layer and the outer layer. The substance having adhesiveness refers to a substance that exerts a holding force on the contact surface when it comes into contact with another substance. Since it has adhesiveness, even if a force is applied when it is gripped, resistance is generated in the movement of the substance inside the space and a sudden shape change is prevented. For this reason, it is a soft touch and is not too soft. Although the following are illustrated as a substance which has adhesiveness, it should just have the above characteristics, and is not specifically limited. Silicone oil such as KF96 (manufactured by Shin-Etsu Chemical Co., Ltd.), silicone oil compound such as tsk5370 (manufactured by Ge Toshiba Silicone Co., Ltd.), and petroleum grease such as Retinax Grease CL (manufactured by Showa Shell Sekiyu Co., Ltd.). GE-1052, sifel 827 (manufactured by Shin-Etsu Chemical Co., Ltd.), SE1885, Sylgard 527, CY52-286 (manufactured by Toray Dow Corning Co., Ltd.), Alpha Gel (manufactured by Geltech Co., Ltd.), WACKER Silgel612 Examples include silicone gels (made by Asahi Kasei Wacker Silicone Co., Ltd.), urethane gels such as gels of human skin (made by Exeal Corporation), and synthetic rubbers such as Exgel (made by Kaji Co., Ltd.). In addition, these sticky substances may be one kind or a mixture of two or more kinds.

  The operation will be described. The cross section of the inner layer composed of the shaft body and the grip portion provided on the shaft body is irregularly shaped, so that the distance between the inner layer and the outer layer is partially changed. For this reason, since the part with many sticky substances and fine solids which are distribute | arranged in space is made, and there are few places, the deformation | transformation amount at the time of holding can be changed. Gripping the part where a lot of sticky substances and fine solids are gripped, it deforms greatly, and if it grips a few parts, it will remain slightly deformed. Can be obtained. Moreover, when the cross section of the inner layer is made irregular, a flat surface portion is secured compared to the cylinder, and the pain and discomfort felt when the tactile sensation of the internal shaft body is transmitted to the fingertip due to the deformation is eliminated. If the shaft section of the gripping part that is gripped by three fingers, the thumb, index finger, and middle finger, such as a writing instrument or lipstick, is triangular or hexagonal, the place where each finger comes into contact is a flat surface. The pain and discomfort felt when the tactile feel of the shaft is transmitted to the fingertips can be resolved.

  FIG. 1 is a diagram of an embodiment in which the present invention is used for a grip portion of a writing instrument. 2 is a cross-sectional view taken along the line A-A 'of FIG. A space was provided by providing an inner layer and an outer layer, and a sticky substance was disposed in this space. Reference numeral 1 is a shaft, reference numeral 2 is a gripping part, reference numeral 3 is an inner layer, reference numeral 4 is an outer layer, and reference numeral 5 is an adhesive substance.

  In Example 1, the shaft tube 1 was molded by injection molding using polypropylene and an elastomer (Lavalon ME5302C, manufactured by Mitsubishi Chemical Corporation, Shore A hardness: 60 degrees) as the grip portion 2. The portion of the shaft tube 1 covered with the gripping portion 2 has a substantially triangular cross section, so that the distance between the inner layer and the outer layer of the gripping portion is partially changed. A grip portion 2 in which a space between the inner layer and the outer layer was filled with silicone gel (SE1885, manufactured by Toray Dow Corning Co., Ltd.) was attached to the shaft body 1.

  The gripping part is deformed according to the external force while exhibiting a resistance feeling due to the adhesiveness and elasticity of the silicone gel when gripped, and after deformation, it exerts its shape retention ability due to the adhesiveness, and has a good feeling with a waist can get.

  At the time of deformation, the portion of the substantially triangular plane has a wider space than the apex portion, so that appropriate softness and deformation amount are ensured, and the apex portion has a small deformation amount, resulting in a stiff feel. In particular, the three fingers of the thumb, index finger, and middle finger abut on a portion of a substantially triangular plane, so that the tactile sensation of the shaft body is less likely to be transmitted to the fingertips compared to the case where the cross section is cylindrical, and pain and discomfort when gripping are felt It can be solved.

  FIG. 3 is a diagram of an embodiment in which the present invention is used for a grip portion of a writing instrument. 4 is a cross-sectional view taken along line A-A 'of FIG. A space was provided inside by providing an inner layer and an outer layer, and an adhesive substance and a fine solid were arranged in this space. Reference numeral 1 is a shaft, reference numeral 2 is a gripping part, reference numeral 3 is an inner layer, reference numeral 4 is an outer layer, reference numeral 5 is an adhesive substance, and reference numeral 6 is a fine solid.

  As Example 2, the shaft tube 1 was molded by injection molding using polypropylene and an elastomer (Lavalon ME5302C, manufactured by Mitsubishi Chemical Corporation, Shore A hardness: 60 degrees) as the grip portion 2. The shaft tube 1 is a cylinder, and the portion of the inner layer 3 covered with the grip portion 2 has a substantially hexagonal cross section, so that the distance between the inner layer and the outer layer of the grip portion is partially changed. Glass beads (Unibeads UB-1719LN, manufactured by Union Co., Ltd.) were arranged as fine solid 6 in the space between the inner layer and the outer layer, and silicone gel (WACKER Silgel612, manufactured by Asahi Kasei Wacker Silicone Co., Ltd.) was filled in the gap. The grip portion 2 was attached to the shaft body 1.

  Silicone gel and glass beads change their position appropriately according to the pressure at which they are gripped, and deform according to external force while demonstrating the resistance due to the adhesiveness and elasticity of silicone gel. Can be used to obtain a good and firm feel.

  At the time of deformation, since the space of the substantially hexagonal plane portion is wider than the apex portion, an appropriate softness and deformation amount are ensured, and since the deformation amount is small at the apex portion, it becomes a hard touch. In particular, when the three fingers of the thumb, index finger, and middle finger come into contact with a substantially hexagonal plane, the internal glass beads are arranged along the plane, so an appropriate gap is created between the outer layer and the inner layer. The tactile sensation of the shaft body is less likely to be transmitted to the fingertips, and pain and discomfort when gripping can be resolved.

  FIG. 5 is a diagram of an embodiment in which the present invention is used for a grip portion of a writing instrument. 6 is a cross-sectional view taken along line A-A 'of FIG. A space was provided inside by providing an inner layer and an outer layer, and an adhesive substance and a fine solid were arranged in this space. Reference numeral 1 is a shaft, reference numeral 2 is a gripping part, reference numeral 3 is an inner layer, reference numeral 4 is an outer layer, reference numeral 5 is an adhesive substance, and reference numeral 6 is a fine solid.

  As Example 3, the shaft cylinder 1 was formed by injection molding using polypropylene and an elastomer (Lavalon ME5302C, manufactured by Mitsubishi Chemical Corporation, Shore A hardness: 60 degrees) as the grip portion 2. The portion covered with the grip portion 2 of the shaft tube 1 has an elliptical cross section, and the inner layer 3 is similarly elliptical, so that the distance between the inner layer and the outer layer of the grip portion is partially changed. Yes. Glass beads (Unibeads UB-1719LN, manufactured by Union Co., Ltd.) were arranged as fine solid 6 in the space between the inner layer and the outer layer, and silicone gel (WACKER Silgel612, manufactured by Asahi Kasei Wacker Silicone Co., Ltd.) was filled in the gap. The grip portion 2 was attached to the shaft body 1.

  Silicone gel and glass beads change their position appropriately according to the pressure at which they are gripped, and deform according to external force while demonstrating the resistance due to the adhesiveness and elasticity of silicone gel. Can be used to obtain a good and firm feel.

  At the time of deformation, the elliptical short diameter part has a wider space than the long diameter part, so that an appropriate softness and deformation amount are ensured, and since the deformation amount is small at the long diameter part, it becomes a hard feel. In particular, when grasping so as to be sandwiched between three fingers, the thumb, index finger, and middle finger, the fingertip hits the flat surface portion by contacting the portion of the elliptical short diameter portion, so that the tactile feel of the shaft body is difficult to be transmitted to the fingertip, Pain and discomfort when gripping can be resolved.

  FIG. 7 is a diagram of an embodiment in which the present invention is used for a grip portion of a writing instrument. FIG. 8 is a cross-sectional view taken along the line A-A 'of FIG. A space was provided inside by providing an inner layer and an outer layer, and an adhesive substance and a fine solid were arranged in this space. Reference numeral 1 is a shaft, reference numeral 2 is a gripping part, reference numeral 3 is an inner layer, reference numeral 4 is an outer layer, reference numeral 5 is an adhesive substance, and reference numeral 6 is a fine solid.

  In Example 4, the shaft cylinder 1 was molded by injection molding using polypropylene and an elastomer (Lavalon ME5302C, manufactured by Mitsubishi Chemical Corporation, Shore A hardness: 60 degrees) as the grip portion 2. The portion covered with the grip portion 2 of the shaft cylinder 1 is a cylinder having a center different from that of the cylinder forming the grip portion outer layer, thereby partially changing the distance between the inner layer and the outer layer of the grip portion. Glass beads (Unibeads UB-1719LN, manufactured by Union Co., Ltd.) were arranged as fine solid 6 in the space between the inner layer and the outer layer, and silicone gel (WACKER Silgel612, manufactured by Asahi Kasei Wacker Silicone Co., Ltd.) was filled in the gap. The grip portion 2 was attached to the shaft body 1.

  Silicone gel and glass beads change their position appropriately according to the pressure at which they are gripped, and deform according to external force while demonstrating the resistance due to the adhesiveness and elasticity of silicone gel. Can be used to obtain a good and firm feel.

  At the time of deformation, a portion having a large space width is secured with an appropriate softness and amount of deformation as compared with a narrow portion. Since the size of the space changes continuously, it can be gripped at a position suitable for how to hold it. Further, since the inner glass beads are unevenly distributed, the center of gravity is located in a wider space, so that it also serves to prevent the writing instrument from rolling and falling on a desk or the like.

  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, engraving swords, and drivers, input pens used in PDAs (personal digital assistance) and electronic notebooks, bicycle handles, etc. Wide range.

DESCRIPTION OF SYMBOLS 1 Shaft body 2 Gripping part 3 Gripping part inner layer 4 Gripping part outer layer 5 Fine solid 6 Adhesive substance

Claims (4)

  In a shaft body in which at least an elastic resin is disposed and / or integrally provided in the grip portion of the shaft body, a space is provided between the shaft body and the grip portion or inside the grip portion, and a fine solid and / or in this space is provided. Or the shaft body characterized by having arranged the substance which has adhesiveness, and making the cross-section of the shaft body of the part covered with a holding part irregular.   2. The shaft body according to claim 1, wherein a fine solid and an adhesive substance are arranged in the space, and the size of the fine solid is made smaller than the minimum width of the space.   A shaft body characterized in that a space is provided inside by providing at least an inner layer and an outer layer in the grip portion, and an adhesive substance is disposed in the space. The shaft body according to claim 3, wherein a fine solid and a sticky substance are arranged in the space, and the size of the fine solid is made smaller than the minimum width of the space.