JP5779872B2 - Elastic body - Google Patents

Description

  The present invention relates to an elastic body that is elastically deformed by pressing and returns to its original shape after releasing the pressure, and there is a space inside the elastic body, and particularly relates to an elastic body that is attached to a grip portion of a shaft body. is there.

Various inventions have been made for elastic bodies that exhibit appropriate elastic deformation in producing comfortable cushioning properties and products for the human body, and there are examples of mounting on the gripping portion of the shaft body. Furthermore, the function of retaining the deformed shape has been studied.
JP 2006-305737 A JP 2003-135223 A

  However, in the embodiment of Patent Document 1, the closed cell foam constituting the gripping member has a recovery delay property, so that when the gripping member is gripped (gripped), the surface of the gripping member is deformed into a hand shape. It is said that the grip feeling will be better because the shape is maintained, but if the grip is released, the grip member will be restored to its original shape, so it is necessary to keep applying force to maintain the shape during gripping There is.

  Moreover, in patent document 2, although the foam (foam) is covered with a highly airtight sheet and the function of maintaining the shape by discharging excess internal air due to shape deformation is exhibited, the airtightness is not impaired. For this reason, it is necessary to have precise parts joining for the purpose and a structure for exhausting and supplying air is required.

  In view of the above problems, the object of the present invention is to provide a comfortable cushioning property, maintenance of a deformed shape as needed, and a function that can be easily restored to the original shape in an elastic body having a space inside, such as a foam. It is an object to provide an elastic body having both.

The present invention provides an elastic body arranged in a gripping portion of a shaft body , wherein the elastic body has a fan-shaped cross-sectional shape radially in a circumferential direction with respect to a longitudinal axis passing through the center of the cross section of the elastic body . The first gist is an elastic body characterized in that a space is arranged and a substance having pseudo-adhesiveness is arranged on the inner surface of the space, and the space inside the elastic body is a communication hole. As the second gist, the third gist is that a substance having pseudo-adhesiveness is disposed on the entire inner surface of the space, and the fourth gist is that a hot melt adhesive is used for the substance having pseudo-adhesiveness. The fifth gist is that a substance having tackiness is used as the substance having pseudo-adhesiveness.

The present invention provides an elastic body arranged in a gripping portion of a shaft body, wherein the elastic body has a fan-shaped cross-sectional shape radially in a circumferential direction with respect to a longitudinal axis passing through the center of the cross section of the elastic body. By arranging a space and placing a substance with pseudo-adhesive properties on the inner surface of the space, it has a comfortable cushioning property, maintains a deformed shape as needed, and has the function of easily restoring the original shape It can be a body. The pseudo-adhesive property means a property capable of repeating the peeling and bonding of the base material, and the adhesive force can be peeled without destroying the base material. Peeling and adhesion can be controlled by external force and temperature. For example, by using a hot melt adhesive as a material having pseudo-adhesiveness, it is possible to make an elastic body that can control the maintenance of its shape and return to its original shape by heat. I can do it. When this elastic body is pushed in from the outside, the space of the pushed-in portion is crushed, and the adhesive disposed on the inner surface of the space is then bonded to each other, and the space is held in a crushed state. However, the deformed shape can be maintained. Since the collapsed space is in a pseudo-adhesive state, when an external force from another direction is applied, the adhesive surface peels off and can be restored to the original space size. The adhesive strength of pseudo-adhesion needs to be greater than the peel strength generated by the shape restoring force of the elastic body itself, but it is possible to cope with elastic bodies that require temporary shape maintenance by reducing the adhesive strength. is there. Furthermore, since it can be composed only of an elastic body with a space inside and a substance having pseudo-adhesiveness, it can be used in a wide range of sizes, from cushions and mattresses, to the size of gripping parts of shafts such as writing instruments. And the elastic body which has the function which can maintain the shape deform | transformed as needed and can be easily restored to the original shape can be provided.

It is sectional drawing of the reference examples 1-3 which used this invention for the foam. FIG. 2 is a cross-sectional view in which FIG. 1 is pressed and deformed and maintained in shape. It is sectional drawing of the reference examples 4-6 which used this invention for the holding part of the shaft body, and the comparative example 1. FIG. It is sectional drawing of the state which carried out the press deformation | transformation and shape maintenance of FIG. It is sectional drawing of Examples 1-4 which used this invention for the holding part of the shaft body, and the comparative example 2. FIG. It is sectional drawing of the state which carried out the press deformation | transformation and shape maintenance of FIG.

  The elastic body having a space inside is not particularly limited as long as it can form a space inside the 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), urethane resin, acrylic resin, melamine resin , Nylon resin, fluorine resin, elastic resin include silicone resin, dimethyl silicone, methyl vinyl silicone, methyl phenyl vinyl silicone, methyl fluoroalkyl silicone (fluorosilico) ), Fluoro-dimethyl copolymer silicone, vinyl chloride, polyurethane resin, elastomer gel, polyethylene gel, urethane rubber, ethylene acrylic rubber, epichlorohydrin rubber, acrylic rubber, ethylene propylene rubber, chloroprene rubber, natural rubber, isoprene rubber, chlorinated polyethylene , Nitrile rubber, styrene-based elastomer, olefin-based elastomer, ester-based elastomer, urethane-based elastomer, 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.

  As a method for producing a space inside the elastic body, a foaming agent or a minute gas is mixed with a resin and / or an elastic resin, and a foam is produced by foaming at the time of molding by injection or extrusion or after molding, or soluble particles are made of resin. And / or mixed with an elastic resin and dissolved after molding to create a space, a method of forming a communication hole in an elastic body by an injection mold or an extrusion die, and joining the same or different materials together However, there is no particular limitation as long as the space can be formed inside the elastic body.

As the foaming agent, a chemical foaming agent, a physical foaming agent, a thermally expandable microcapsule, or the like is used. Specific examples of chemical foaming agents 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.

  Examples of the soluble particles include inorganic salt particles, metal particles, and alloy particles. Specific examples include inorganic salt particles such as sodium chloride, potassium chloride, sodium carbonate, potassium carbonate and lithium chloride, iron particles, aluminum particles, copper particles, brass particles, calcium carbonate particles, talc particles, mica particles, and the like. .

  Substances having pseudo-adhesive properties include those generally used for pseudo-adhesion, for example, rubber adhesives such as natural rubber and synthetic rubber, acrylic acid and / or acrylic acid ester as main monomer components. Acrylic adhesive, vinyl acetate polymer, ethylene-vinyl acetate copolymer (EVA), etc., vinyl acetate adhesive containing vinyl acetate as the main monomer component, polysaccharide adhesive such as starch, sodium alginate, etc. A water-soluble adhesive such as a dextrin adhesive can be used and is not particularly limited. Moreover, the hot melt adhesive etc. which consist of a propylene ethylene copolymer and a tackifier are mentioned as a pseudo-adhesive. These substances having pseudo adhesiveness may be one kind or a mixture of two or more kinds.

  A substance having tackiness may be used as the substance having pseudo-adhesiveness. A substance having adhesiveness is a substance that exerts a force to maintain a contact state on a contact surface when it comes into contact with another substance. Silicone oil compounds such as Performance Materials Japan, and petroleum greases such as Retinax Grease CL (manufactured by Showa Shell Sekiyu KK). 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 human skin gel (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 adhesive strength of the pseudo-adhesion needs to be greater than the peel strength generated by the shape restoring force of the elastic body itself, but it is also possible to deal with elastic bodies that require temporary shape maintenance by reducing the adhesive strength, etc. It may be selected as appropriate. In addition, when using a hot melt adhesive whose adhesive strength changes with temperature, it is possible to maintain the deformed shape by deforming and cooling the elastic body after heating to a temperature necessary for pseudo-adhesion. Furthermore, when the adhesive strength is lowered by raising the temperature to the temperature at which the hot melt adhesive melts again and peeling occurs due to the shape restoring force of the elastic body itself, it can be restored to its original shape, and the shape can be manipulated by heat.

  As a method of arranging a substance having pseudo-adhesiveness on the inner surface of the space, if the elastic body is a foam, the elastic body is immersed in a substance having pseudo-adhesiveness, impregnated inside, and then the excess is taken out. It can be placed inside the space. Moreover, if it is a pipe-shaped communicating hole, it can distribute | arrange to the space inner surface by flowing the liquid substance which has a pseudo-adhesiveness in a communicating hole. That is, a substance having pseudo-adhesiveness and an arrangement method thereof may be appropriately selected according to the shape and state of the internal space of the elastic body, and are not particularly limited.

  The arrangement state of the substance having pseudo-adhesive property on the inner surface of the space is arranged in a layer covering the entire inner surface, arranged in an intermittent band, or innumerable fine points by spraying in particles, etc. What is necessary is just to select suitably according to the characteristic of the substance which has pseudo-adhesiveness, the size and shape of the internal space, and the surface state, and it is not particularly limited as long as the pseudo-adhesive ability can be exhibited. If arranged, the pseudo-adhesive ability can be surely exhibited against deformation from all directions, and high adhesive strength can be expected because the adhesives are in contact with each other on the surface.

  An outer covering for the purpose of protecting the elastic body and improving the tactile sensation may be arranged around the elastic body having a space inside. Foam with holes on the outer surface may cause tearing or breakage of the foam when an external force is applied directly, so there is an outer shell made of elastic resin, resin film, cloth, etc. on the outer periphery of the foam It is desirable. In addition, there is an advantage that the tactile sensation can be easily changed by preventing the outflow of the substance having pseudo-adhesiveness due to the presence of the outer shell and changing the surface state of the contact surface with the outside. There is also.

FIG. 1 is a cross-sectional view of Reference Examples 1, 2, and 3 in which the present invention is used for a foam. FIG. 2 shows a state where an external force is applied to the foam of FIG. Reference numeral 1 is an elastic body, reference numeral 2 is an internal space, reference numeral 3 is a substance having pseudo-adhesive properties, and reference numeral 4 is a pseudo-adhered space.

As Reference Example 1, the elastic body 1 was a chloroprene rubber sponge, and a hot melt adhesive (Excelpeel EP-90, manufactured by MORESCO Co., Ltd.) was used as a substance having pseudo-adhesiveness. This hot melt adhesive does not have adhesiveness up to 60 ° C, but exhibits pseudo-adhesiveness when heated to 60 ° C or higher. The elastic body was immersed in an adhesive heated to a liquid state, and the surroundings were evacuated to degas the air in the elastic body, and the space was impregnated with the adhesive. After removing the elastic body from the adhesive, the vacuum was again applied to remove the excessively impregnated adhesive in the space and dry it, and an elastic body in which the adhesive was disposed only on the inner surface of the space was produced. When this elastic body is pushed in from the outside in a state of 60 ° C. or higher, the space of the pushed-in portion is crushed. At that time, the adhesive disposed on the inner surface of the space is pseudo-bonded and the space is held in a crushed state, so that the deformed shape can be maintained even if the push-in is released. Since the crushed space is in a pseudo-adhesive state, when an external force acting in the peeling direction is applied, or when heated to 60 ° C. or higher again, the bonded surface peels off and can be restored to the original space size. At this time, the chloroprene rubber sponge can be easily restored to its original shape because a force to expand the space acts as soon as the pseudo-adhesion on the inner surface of the space is peeled off.

As Reference Example 2, the elastic body 1 was a chloroprene rubber sponge, and an adhesive containing an acrylate resin as a substance having pseudo-adhesive properties (Pit Multi 2, manufactured by Dragonfly Pencil Co., Ltd.). This adhesive exhibits an adhesive effect when the application surface is applied in a liquid state, but exhibits a pseudo-adhesion effect when the application surface is applied after drying. The elastic body was immersed in a liquid adhesive, and the surroundings were evacuated to degas the air in the elastic body, and the space was impregnated with the adhesive. After removing the elastic body from the adhesive, the vacuum was again applied to remove the excessively impregnated adhesive in the space and dry it, and an elastic body in which the adhesive was disposed only on the inner surface of the space was produced. When this elastic body is pushed in from the outside, the space of the pushed-in part is crushed. At that time, the adhesives disposed on the inner surface of the space are bonded to each other, and the space is held in a crushed state, so that the deformed shape can be maintained even if the push-in is released. Since the collapsed space is in a pseudo-adhesive state, when an external force from another direction is applied, the adhesive surface peels off and can be restored to the original space size. At this time, the chloroprene rubber sponge can be easily restored to its original shape because a force to expand the space acts as soon as the pseudo-adhesion on the inner surface of the space is peeled off.

As Reference Example 3, the elastic body 1 was a chloroprene rubber sponge, and a silicone gel (WACKER Silgel 612, manufactured by Asahi Kasei Wacker Silicone Co., Ltd.) was used as a substance having pseudo-adhesiveness. The elastic body was immersed in a liquid silicone gel and the surroundings were evacuated to degas the air in the elastic body, and the space was impregnated with the silicone gel. After removing the elastic body from the silicone gel, the vacuum state was again applied to remove the excessively impregnated silicone gel in the space, and an elastic body in which the silicone gel was disposed only on the inner surface of the space was produced. When this elastic body is pushed in from the outside, the space of the pushed-in part is crushed. At that time, the silicone gels arranged on the inner surface of the space are bonded to each other, and the space is held in a crushed state, so that the deformed shape can be maintained even if the pushing is released. The collapsed space is in a pseudo-adhesive state, but when an external force from another direction is applied or when the restoring force of the sponge exceeds the adhesiveness of the silicone gel over time, the adhesive surface peels off and the original space It can be restored to size. At this time, the chloroprene rubber sponge exerts a force to expand the space when the pseudo-adhesion on the inner surface of the space is peeled off, but in the case of silicone gel that becomes strong and sticky, the peeling gradually proceeds. Restore to.

FIG. 3 is a cross-sectional view of Reference Examples 4, 5, and 6 in which the present invention is used for a grip portion of a shaft body. FIG. 4 shows a state where an external force is applied to the gripping portion of FIG. Reference numeral 1 is an elastic body, reference numeral 2 is an internal space, reference numeral 3 is a substance having pseudo-adhesiveness, reference numeral 4 is a pseudo-adhered space, reference numeral 5 is a shaft body, and reference numeral 6 is a jacket. is there.

As Reference Example 4, the elastic body 1 was a cylindrical chloroprene rubber sponge, and a hot melt adhesive (Excelpeel EP-90, manufactured by MORESCO Co., Ltd.) was used as a substance having pseudo adhesiveness. This hot melt adhesive does not have adhesiveness up to 60 ° C, but exhibits pseudo-adhesiveness when heated to 60 ° C or higher. The elastic body was immersed in an adhesive heated to a liquid state, and the surroundings were evacuated to degas the air in the elastic body, and the space was impregnated with the adhesive. After removing the elastic body from the adhesive, the vacuum was again applied to remove the excessively impregnated adhesive in the space and dry it, and an elastic body in which the adhesive was disposed only on the inner surface of the space was produced. This elastic body was attached to the grip portion of the shaft body 5, and the outer peripheral portion was covered with an outer cover body 6 formed of an elastomer (Lavalon ME5302C, manufactured by Mitsubishi Chemical Corporation, Shore A hardness: 60 degrees). When this elastic body is pushed in from the outside in a state of 60 ° C., the space of the pushed-in portion is crushed. At that time, the adhesives disposed on the inner surface of the space are bonded to each other, and the space is held in a crushed state, so that the deformed shape can be maintained even if the push-in is released. Since the crushed space is in a pseudo-adhesive state, when an external force acting in the peeling direction is applied, or when heated to 60 ° C. or higher again, the bonded surface peels off and can be restored to the original space size. At this time, the sponge of chloroprene rubber can be easily restored to its original shape because the force of expanding the space works when the pseudo-adhesion on the inner surface of the space is peeled off.

As Reference Example 5, the elastic body 1 used was a cylindrical chloroprene rubber sponge, and a liquid adhesive (Pit Multi 2, manufactured by Dragonfly Pencil Co., Ltd.) containing an acrylate resin as a substance having pseudo-adhesiveness. . The elastic body was immersed in the liquid adhesive and the surroundings were evacuated to degas the air in the elastic body, and the space was impregnated with the adhesive. After removing the elastic body from the adhesive, the vacuum was again applied to remove the excessively impregnated adhesive in the space and dry it, and an elastic body in which the adhesive was disposed only on the inner surface of the space was produced. This elastic body was attached to the grip portion of the shaft body 5, and the outer peripheral portion was covered with an outer cover body 6 formed of an elastomer (Lavalon ME5302C, manufactured by Mitsubishi Chemical Corporation, Shore A hardness: 60 degrees). When this elastic body is pushed in from the outside, the space of the pushed-in part is crushed. At that time, the adhesives disposed on the inner surface of the space are bonded to each other, and the space is held in a crushed state, so that the deformed shape can be maintained even if the push-in is released. Since the crushed space is in a pseudo-adhesive state, when an external force acting in the peeling direction is applied, the bonded surface peels off and can be restored to the original space size. At this time, the chloroprene rubber sponge can be easily restored to its original shape because a force to expand the space acts as soon as the pseudo-adhesion on the inner surface of the space is peeled off.

As Reference Example 6, a cylindrical chloroprene rubber sponge was used as the elastic body 1, and a silicone gel (WACKER Silgel 612, manufactured by Asahi Kasei Wacker Silicone Co., Ltd.) was used as a substance having pseudo-adhesiveness. The elastic body was immersed in a liquid silicone gel and the surroundings were evacuated to degas the air in the elastic body, and the space was impregnated with an adhesive. After removing the elastic body from the silicone gel, the vacuum state was again applied to remove the excessively impregnated silicone gel in the space, and an elastic body in which the silicone gel was disposed only on the inner surface of the space was produced. This elastic body was attached to the grip portion of the shaft body 5, and the outer peripheral portion was covered with an outer cover body 6 formed of an elastomer (Lavalon ME5302C, manufactured by Mitsubishi Chemical Corporation, Shore A hardness: 60 degrees). When this elastic body is pushed in from the outside, the space of the pushed-in part is crushed. At that time, the silicone gels arranged on the inner surface of the space are bonded to each other, and the space is held in a crushed state, so that the deformed shape can be maintained even if the pushing is released. The collapsed space is in a pseudo-adhesive state, but when an external force from another direction is applied or when the restoring force of the sponge exceeds the adhesiveness of the silicone gel over time, the adhesive surface peels off and the original space It can be restored to size. At this time, the chloroprene rubber sponge exerts a force to expand the space when the pseudo-adhesion on the inner surface of the space is peeled off, but in the case of silicone gel that becomes strong and sticky, the peeling gradually proceeds. Restore to.

FIG. 5 is a cross-sectional view of Examples 1 , 2 , 3 , and 4 in which the present invention is used for a gripping portion of a shaft body. FIG. 6 shows a state where an external force is applied to the gripping portion of FIG. Reference numeral 1 is an elastic body, reference numeral 2 is an internal space extending in the longitudinal direction, reference numeral 3 is a substance having pseudo-adhesive properties, reference numeral 4 is a pseudo-adhered space, and reference numeral 5 is a shaft body.

As Example 1 , the elastic body 1 used was a silicone tube having communication holes produced by extrusion molding, and a hot-melt adhesive (Excelpeel EP-90, manufactured by MORESCO Co., Ltd.) as a substance having pseudo-adhesiveness. This hot melt adhesive does not have adhesiveness up to 60 ° C, but exhibits pseudo-adhesiveness when heated to 60 ° C or higher. The heated adhesive liquid was poured into the communication hole of the silicone tube, and the adhesive was applied to the inner surface of the communication hole and then dried to produce an elastic body in which the adhesive was disposed only on the inner surface of the communication hole. This elastic body was attached to the grip portion of the shaft body 5. When this elastic body is pushed in from the outside in a state of 60 ° C., the communication hole of the pushed-in portion is crushed. At that time, the adhesives disposed on the inner surface of the communication hole are bonded to each other, and the communication hole is held in a crushed state, so that the deformed shape can be maintained even if the push-in is released. Since the crushed communication hole is in a pseudo-adhesive state, when an external force acting in the peeling direction is applied, or when heated to 60 ° C. or higher again, the bonded surface peels off and can be restored to the original shape of the communication hole. At this time, the silicone tube can be easily restored to its original shape because the force of expanding the communication hole works when the pseudo-adhesion on the inner surface of the communication hole is peeled off.

As Example 2 , the elastic body 1 is a silicone tube having a communicating hole produced by extrusion molding, and a liquid adhesive containing an acrylate resin as a substance having pseudo-adhesive properties (Pit Multi 2, manufactured by Dragonfly Pencil Co., Ltd.) Was used. A liquid adhesive was poured into the communication hole of the silicone tube, the adhesive was applied to the inner surface of the communication hole, and then dried to produce an elastic body in which the adhesive was disposed only on the inner surface of the communication hole. This elastic body was attached to the grip portion of the shaft body 5. If this elastic body is pushed in from the outside, the communication hole of the pushed-in part will be crushed. At that time, the adhesives arranged on the inner surface of the communication hole are bonded to each other, and the communication hole is held in a crushed state, so that the deformed shape can be maintained even if the push-in is released. Since the crushed communication hole is in a pseudo-adhesion state, when an external force acting in the peeling direction is applied, the bonding surface is peeled off and can be restored to the original communication hole shape. At this time, the silicone tube can be easily restored to its original shape because the force of expanding the communication hole acts immediately after the pseudo-adhesion on the inner surface of the communication hole is peeled off.

As Example 3 , the elastic body 1 used was a silicone tube having communication holes produced by extrusion molding, and a silicone gel (WACKER Silgel 612, manufactured by Asahi Kasei Wacker Silicone Co., Ltd.) as a substance having pseudo-adhesiveness. A liquid silicone gel was poured into the communication hole of the silicone tube, an adhesive was applied to the inner surface of the communication hole, and then dried to produce an elastic body in which the silicone gel was disposed only on the inner surface of the communication hole. This elastic body was attached to the grip portion of the shaft body 5. If this elastic body is pushed in from the outside, the communication hole of the pushed-in part will be crushed. At that time, since the silicone gels arranged on the inner surface of the communication hole are bonded to each other and the communication hole is held in a crushed state, the deformed shape can be maintained even if the pushing is released. The crushed communication hole is in a pseudo-adhesive state, but when an external force from another direction is applied, or when the restoring force of the silicone tube exceeds the adhesiveness of the silicone gel over time, the adhesive surface peels off and the original It can be restored to the shape of the communication hole. At this time, the silicone tube has a force to expand the communication hole when the pseudo-adhesion on the inner surface of the communication hole is peeled off, but in the case of a silicone gel that becomes stringy with strong adhesiveness, the peeling gradually proceeds. Restore to.

As Example 4 , the elastic body 1 used was a silicone tube having a communicating hole produced by extrusion molding, and an adhesive (spray glue 55, manufactured by Sumitomo 3M Limited) containing acrylic rubber as a substance having pseudo-adhesiveness. . A spray glue nozzle was sprayed toward the inside of the communication hole, and an adhesive was applied to the inner surface of the communication hole and then dried to produce an elastic body having an adhesive only on the inner surface of the communication hole. This elastic body was attached to the grip portion of the shaft body 5. If this elastic body is pushed in from the outside, the communication hole of the pushed-in part will be crushed. At that time, the adhesives arranged on the inner surface of the communication hole are bonded to each other, and the communication hole is held in a crushed state, so that the deformed shape can be maintained even if the push-in is released. Since the crushed communication hole is in a pseudo-adhesion state, when an external force acting in the peeling direction is applied, the bonding surface is peeled off and can be restored to the original communication hole shape. At this time, the silicone tube can be easily restored to its original shape because the force of expanding the communication hole acts immediately after the pseudo-adhesion on the inner surface of the communication hole is peeled off.

As a comparative example 1, only the chloroprene rubber sponge in which the elastic body 1 in the reference example 4 is cylindrical is attached to the gripping portion of the shaft body 5, and the outer peripheral portion is an elastomer (Lavalon ME5302C, manufactured by Mitsubishi Chemical Corporation, Shore It was covered with an outer casing 6 molded with A hardness (60 degrees). When this elastic body is pushed in from outside, the space of the pushed-in portion is crushed, but when the push-in is released, the original shape is restored without maintaining the deformed shape.

As Comparative Example 2, an elastic body in which the communication hole of Example 3 was filled with a silicone gel (Alpha Gel (manufactured by Geltech Co., Ltd.)) was produced, and this elastic body was attached to the gripping portion of the shaft body 5. When the body is pushed in from the outside, the pushed portion is deformed by the elasticity of the elastic body, but when the push is released, the deformed shape is restored to the original shape without maintaining the deformed shape.

Examples 1 to 4 and Comparative Examples 1 and 2 were evaluated in terms of simplicity of pseudo-adhesion, deformation maintenance, shape recovery speed, and pseudo-adhesion repeatability.

Since Example 1 requires heating at 60 ° C. for pseudo-adhesion, evaluation of “simplification of pseudo-adhesion” is low. Since the strength of the pseudo-adhesion is strong, the deformation maintaining property is long, and since there is no adhesive force at 60 ° C. or less, the shape recovery after peeling is fast, and “deformation maintaining property” and “shape recovery rate” are highly evaluated. Moreover, since pseudo-adhesion is possible by setting the temperature again to 60 ° C., the evaluation of “pseudo-adhesion repeatability” is also high. Since Examples 2 and 4 exhibit pseudo-adhesiveness at room temperature, the evaluation of “simplicity of pseudo-adhesion” is high. Because of the adhesive that can be peeled off at room temperature, the “deformation maintaining property” is high, but it is inferior to the hot melt adhesive, and the shape recovery after peeling is fast, so the “shape recovery speed” is highly evaluated. In addition, when adhesion and peeling are repeated, the adhesion decreases when foreign matter adheres to the adhesive surface, so the evaluation of `` pseudo-adhesion repeatability '' is inferior to that of hot melt adhesives. The arranged Example 4 is inferior to the Example 2 . Since Example 3 exhibits pseudo-adhesiveness at room temperature, the evaluation of “simplification of pseudo-adhesion” is high. Although it exhibits adhesive strength with high tackiness, it is difficult to maintain the adhesive state, so the evaluation of “deformability” is low. Since the shape recovery after peeling becomes strong and sticky, the “shape recovery speed” is slow. In addition, since the tackiness does not change even after repeated bonding and peeling, the evaluation of “pseudo-adhesion repeatability” is high. Since Comparative Example 1 has a configuration excluding the pseudo-adhesive of Reference Example 4, and Comparative Example 2 has a configuration excluding the pseudo-adhesive of Example 2 , “simplification of pseudo-adhesion” “pseudo-adhesion repeatability” Cannot be evaluated. Since the effect of pseudo-adhesion is not exhibited, “deformation maintenance” is equally low, but “shape recovery speed” is high because the elasticity of chloroprene rubber sponge and silicone tube is utilized as it is.

The present invention provides an elastic body arranged in a gripping portion of a shaft body, wherein the elastic body has a fan-shaped cross-sectional shape radially in a circumferential direction with respect to a longitudinal axis passing through the center of the cross section of the elastic body. The present invention relates to an elastic body in which a space is provided and a substance having pseudo adhesiveness is provided on the inner surface of the space. Examples of the use of elastic bodies include writing instruments such as mechanical pencils , ballpoint pens, correction pens, tools such as cutters, engraving swords, and drivers, shafts such as input pens used in PDAs (personal digital assistance) and electronic notebooks. A wide variety of grips and bicycle handles.

DESCRIPTION OF SYMBOLS 1 Elastic body 2 Space 3 Pseudo-adhesive substance 4 Pseudo-adhered space 5 Shaft body 6 Jacket body

Claims (5)

In the elastic body arranged in the gripping portion of the shaft body, a space having a fan-like cross-sectional shape is arranged radially in the circumferential direction with respect to the longitudinal axis passing through the center of the cross section of the elastic body. and elastic body, characterized in that arranged a substance having a pseudo-adhesive in the space inside surface.   The elastic body according to claim 1, wherein a space inside the elastic body is a communication hole.   The elastic body according to claim 1 or 2, wherein a substance having pseudo-adhesiveness is disposed on the entire inner surface of the space.   The elastic body according to any one of claims 1 to 3, wherein a hot-melt adhesive is used for the substance having pseudo-adhesiveness.   The elastic body according to any one of claims 1 to 4, wherein a substance having adhesiveness is used as the substance having pseudo-adhesiveness.