JP2012158091A - Barrel body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gripping part improved in adhesiveness so that a non-slip effect is imparted to a part which touches a finger or a palm when gripping a barrel body.SOLUTION: Such a structure that a van der Waals' force is generated between a barrel body surface and a pressing surface is arranged on the barrel body surface, thereby, the highly effective non-slip effect is provided, and such a function as to be easily peeled is provided because adsorption has directionality.

Description

  The present invention relates to a shaft having an elastically deformable surface structure.

The shaft body is provided with an elastic resin or a foam in order to exert an anti-slip effect at a position where it comes into contact with a finger or palm when gripped. In order to improve the anti-slip effect, a gripping part with a low hardness elastic body to improve adhesion, and a hole with a suction cup function to adsorb to the finger or palm on the surface of the gripping part A gripping part is being considered.
JP-A-3-292200 JP 2009-166341 A Autum, k. (2006). How gecko toes stick. American Scientist, 94, 124-132.

  However, in the example of Patent Document 1, it is possible to expand the contact area and improve the frictional resistance by an elastic body with low rubber hardness, but since the surface of the low hardness elastic body is sticky, There are problems such as adhesion of dirt.

  Further, in the example of Patent Document 2, the recessed space is deformed and the closed space formed by the fingertip and the recessed portion is in a reduced pressure state and adsorbs to the fingertip. Furthermore, since the same force is required when peeling off, there is a problem that an extra force is required at the end of writing or when changing.

  In view of the above problems, an object of the present invention is to provide a shaft body, particularly a shaft body provided with a surface structure that exhibits a suction ability to a fingertip in a grip portion of the shaft body.

  The present invention relates to a shaft body having an elastically deformable surface structure, the shaft body having a surface structure in which van der Waals force is generated between the shaft body surface and a pressing surface, and the shaft body. A shaft body that is provided with a flexible protrusion on the surface and increases the van der Waals force generated between the pressing surface and the pressing surface at the time of flexibility is a second gist, and the shaft body surface is flexible in one direction. The shaft body in which the van der Waals force generated between the pressing surface and the pressing surface when flexing is increased is a third gist, and the protruding surface of the flexible protrusion is further flexible. The fourth gist is that the protrusions are provided.

  The present invention provides a shaft body that does not slip but has a non-slip surface, and a shaft body that can exhibit a non-slip effect for a long period of time by producing a structure that exhibits adsorption by van der Waals force on the shaft body surface. I can do it.

It is the perspective view of Examples 1-3 which used this invention for the writing instrument, and Examples 5-9. 2 is an enlarged cross-sectional view of a surface of a grip portion according to Embodiment 1. FIG. FIG. 3 is an enlarged cross-sectional view of the surface when the grip portion of Example 1 is gripped. 6 is an enlarged cross-sectional view of a surface of a grip portion according to Embodiment 2. FIG. FIG. 6 is an enlarged cross-sectional view of a surface when a grip portion of Example 2 is gripped. FIG. 6 is an enlarged cross-sectional view of a surface of a grip portion of Example 3. FIG. 6 is an enlarged cross-sectional view of a surface when a grip portion of Example 3 is gripped. It is a perspective view of Example 4 which used this invention for the writing instrument. (A) It is a rear view of 8. (B) It is a surface expanded sectional view of Drawing 9 (a). (C) It is a surface expanded sectional view of Drawing 9 (b). (A) It is an enlarged view of FIG. (B) It is a surface expanded sectional view of Drawing 10 (a). (A) The enlarged front view of the cylindrical protrusion formed in multiple numbers on the surface of the holding part of Example 5. FIG. (B) The side view of Fig.11 (a). (C) The perspective view of Fig.11 (a). (A) The enlarged front view of the cylindrical protrusion formed in multiple numbers on the surface of the holding part of Example 6. FIG. (B) The side view of Fig.12 (a). (C) The perspective view of Fig.12 (a). (A) The enlarged front view of the cylindrical protrusion formed in multiple numbers on the surface of the holding part of Example 7. FIG. (B) The side view of Fig.13 (a). (C) The perspective view of Fig.13 (a). (A) The enlarged front view of the cylindrical protrusion formed in multiple numbers on the surface of the holding part of Example 8. FIG. (B) The side view of Fig.14 (a). (C) The perspective view of Fig.14 (a). (A) The perspective view of the holding part of Example 9. FIG. (B) The longitudinal cross-sectional view of Fig.15 (a). (C) The enlarged view of FIG.15 (b). (A) The longitudinal cross-sectional view of the holding part of Example 10. FIG. (B) The perspective view of Fig.16 (a).

  The principle of "van der Waals force" is being studied from the concept of "biomimetics" that artificially reproduces the superior functions of organisms represented by the soles of geckos that can stick and move on a smooth glass surface The “surface structure that exhibits the adsorption ability” is produced on the shaft body surface. Examples of the surface structure in which van der Waals force is generated between the shaft body surface and the pressing surface include a multi-stage structure on the sole of the gecko. The gecko's sole grows densely with fine hairs, and the tips of the hairs are further branched and thin, and the tips of the hairs have a spatula shape. When the spatula-shaped surface portion and the surface to be adsorbed are in close contact, van der Waals force is generated. The adsorption force due to the van der Waals force generated on the surface of one spatula is very small, but the abutment area due to the innumerable hair tips concentrated on the sole increases, so the generated adsorption force increases, and the target surface (Non-Patent Document 1). As long as the structure of the sole of this gecko or a simplified structure thereof, a structure in which finer protrusions are formed on the top surface of the protrusions or the side surface near the tip may be used. Adsorption by van der Waals force allows the surface structure to have directionality, so that the adsorption force can be controlled according to the direction of load, and in a certain direction like a writing instrument that grips and applies force in the direction of the paper. Ideal for anti-slip shafts that apply force to the shaft. Directionality can be imparted to the attracting force by van der Waals force by imparting directionality to the projections and the fine projections provided on the top surface and the side surface near the tip of the projections. Specifically, by creating an angle that is easy to flex with respect to pressing and a state in which a plane parallel to the pressing surface is formed at the time of flexing, the contact area for the load in the flexing direction after pressing Since the generated van der Waals force becomes strong, it exerts strong frictional resistance and provides an anti-slip effect, but it is easy because no frictional resistance is generated in the load in the direction of pressing release or in the opposite direction of flexibility. It becomes possible to peel off.

More specific shapes include a structure in which the tip of the columnar protrusion is cut at a fixed angle so that a large number of columnar protrusions such as a columnar shape and a prismatic shape formed on the surface of the shaft body easily fall down in one direction. You may form with an angle. In order to increase the generated van der Waals force, a structure in which finer protrusions are formed on the top and side surfaces of the columnar protrusions may be used. These fine protrusions may be columnar protrusions or convex plate shapes, but it is desirable to have a shape such as an angle on the tip surface so that the van der Waals force tends to fall in a suitable direction. Further, a structure in which finer protrusions are formed on the top and side surfaces of the annular protrusion formed by connecting the protrusions in the periphery of the shaft may be used, and further, the annular protrusion may have a broken portion. The fine protrusions may be applied to the entire top surface or side surfaces of the protrusions, or may be intermittently provided. For example, the fine protrusions are formed at three locations with the entire circumference divided into six with respect to the top surface of the annular protrusion, and others. Fine projections may not be formed at these three locations, and locations where these projections are formed and locations where no projections are formed may be alternately arranged. By changing the angle at which the tip of the columnar protrusion or fine protrusion is cut, or by changing the angle of the columnar protrusion or fine protrusion itself, it is possible to respond widely to differences in the gripping force and holding method on one shaft body Become. A plurality of these columnar projections, annular projections, and fine projections provided on the top surface and side surfaces thereof may be combined in one shaft body, and their angle, shape, cutting angle of the tip surface, and shape may be appropriately selected.

By giving direction to the surface structure, when a force is applied in a certain direction, the van der Waals force is strengthened to exert an anti-slip effect, and the van der Waals force is weakened in another direction. Can be easily peeled off. In addition, it is possible to set each direction in which the anti-slip effect is desired. For example, in the writing instrument shaft, the surface structure of the thumb, index finger, and middle finger has different directions, and when force is applied in the paper direction during writing, the van der Waals force is increased. An anti-slip effect is exerted on the fingertip, and the van der Waals force can be weakened in the direction in which the finger is opened when changing or releasing, and the shaft body should exhibit an anti-slip effect efficiently. I can do it.

  Examples of the method for producing a surface structure in which van der Waals force is generated between the shaft surface and the pressing surface include molding, cutting, and edging. In addition, a method of forming protrusions by orienting carbon nanotubes on the surface of the substrate by chemical vapor deposition or a method of forming protrusions using a focused ion beam excitation reaction can be adopted. There is no particular limitation as long as a surface structure in which van der Waals force is generated can be formed between the surfaces.

A surface structure in which van der Waals force is generated between the pressing surface and the pressing surface can be directly formed on the shaft body surface when the material has sufficient strength as the shaft body. Further, in the case of a material that does not have sufficient strength as a shaft body, the manufactured member may be attached to another shaft body as a grip portion, and the configuration is not particularly limited.

  Examples of the material used for the shaft include resin and elastic resin, and any material can be used as long as it can form a surface structure that generates van der Waals force between the surface of the shaft and the pressing surface, and is not particularly limited. 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, fluororesin, polyimide, elastic resin include silicone resin, dimethyl silicone, methyl vinyl silicone, methyl phenyl vinyl silicone, methyl fluoroalkyl silicone Silicone), 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, chlorine Polyethylene, nitrile rubber, styrene elastomer, olefin elastomer, ester elastomer, urethane elastomer and the like. These resins and / or elastic resins may be one kind or a mixture of two or more kinds.

FIG. 1 is a perspective view of Examples 1 to 3 and Examples 5 to 9 in which each shaft body of the present invention is used for the grip portion 2 of the writing instrument 1.
FIG. 2 is an enlarged cross-sectional view of the surface of the grip portion 2 according to the first embodiment, and FIG. 3 is a view in which a finger contacts the surface of the grip portion of FIG. Reference numeral 1 is a writing instrument, reference numeral 2 is a gripping part, reference numeral 3 is a cylindrical projection, reference numeral 4 is a finger, and reference numeral 5 is a surface on which van der Waals force is generated.

  As Example 1, the gripping part 2 of the writing instrument 1 (oil-based ballpoint pen) was molded by injection molding using an elastomer (Actimer AE-2040S, manufactured by Riken Technos Co., Ltd., Shore A hardness: 40 °). A plurality of cylindrical protrusions 3 having a diameter of 1.0 mm are formed on the surface of the grip portion 2. The tip of the cylindrical protrusion is cut at a certain angle so that the cylindrical protrusion easily falls in one direction when the finger comes into contact with the grip portion. In this case, the pen tip side is cut so as to easily fall in the pen tip direction of the writing instrument 1. Van der Waals force is generated between the fingertip touching the gripping part and the surface of the gripping part. When the fingertip touches the surface of the gripping part when gripping, the fan falls in a certain direction as shown in FIG. 3, and the fan is generated by increasing the area where the tip of the cylindrical protrusion cut at a certain angle (45 °) touches the fingertip. As the Delwars force increases, the restoring force of the cylindrical projection works and the resistance to the back of the writing instrument is also generated, so that the sliding of the finger toward the pen tip can be prevented. In addition, when the finger is moved upward or moved away, the resistance is eased when the finger is moved upward, so that it can be changed or released with a light force. In this embodiment, the tip end of the cylindrical protrusion is cut at a constant angle of 45 °, but it may be cut at different angles such as 45 ° and 60 °, and they are arranged in a certain range or alternately. You may distribute. By combining the cylindrical protrusions whose front end portions are cut at a plurality of angles, it is possible to obtain the effect of increasing the van der Waals force for various ways of holding.

  4 is an enlarged cross-sectional view of the surface of the grip portion 2 of the second embodiment, and FIG. 5 is a view in which a finger is in contact with the surface of the grip portion of FIG. Reference numeral 1 is a writing instrument, reference numeral 2 is a gripping part, reference numeral 3 is a cylindrical projection, reference numeral 4 is a finger, and reference numeral 5 is a surface on which van der Waals force is generated.

  As Example 2, the grip part 2 of the writing instrument 1 (oil-based ballpoint pen) was molded by injection molding using (Lavalon ME5302C, manufactured by Mitsubishi Chemical Corporation, Shore A hardness: 60 degrees). A plurality of cylindrical protrusions 3 having a diameter of 0.3 mm are formed on the surface of the grip portion 2 as shown in FIG. When the finger comes into contact with the gripping part, the cylindrical protrusion is inclined at a constant angle (20 °) so that the cylindrical protrusion easily falls in one direction, and the tip is cut at a constant angle (45 °). In this case, the writing tool 1 is cut so that the pen tip side is inclined and the pen tip side is raised so that the writing tool 1 can easily fall down. Van der Waals force is generated between the fingertip touching the gripping part and the surface of the gripping part. When the fingertip touches the surface of the gripping part when gripping, the van der Waals force is generated because the tip of the cylindrical projection cut at a constant angle and the area touched by the fingertip increase as shown in FIG. As the force increases, the restoring force of the cylindrical protrusion works and resistance to the back of the writing instrument is generated, so that it is possible to prevent the finger from sliding in the direction of the pen tip. In addition, when the finger is moved upward or moved away, the resistance is eased when the finger is moved upward, so that it can be changed or released with a light force. In this embodiment, the cylindrical protrusions are inclined at a constant angle of 20 °. However, the cylindrical protrusions may be inclined at different angles such as 20 ° and 40 °. Also good. In addition, the tip of the cylindrical protrusion is cut at a constant angle of 45 °, but it may be cut at different angles such as 45 ° and 60 °. May be. By combining the cylindrical protrusions inclined at a plurality of angles and the cylindrical protrusions whose front end portions are cut at a plurality of angles, it is possible to obtain an effect of increasing the van der Waals force for various holding methods.

  6 is an enlarged cross-sectional view of the surface of the grip portion 2 of the third embodiment, and FIG. 7 is a view in which a finger is in contact with the surface of the grip portion of FIG. Reference numeral 1 is a writing instrument, reference numeral 2 is a gripping part, reference numeral 3 is a cylindrical protrusion, reference numeral 4 is a finger, reference numeral 5 is a surface on which van der Waals force is generated, and reference numeral 6 is a minute protrusion.

  As Example 3, the gripping part 2 of the writing instrument 1 (oil-based ballpoint pen) was molded by injection molding using (Lavalon ME5302C, manufactured by Mitsubishi Chemical Corporation, Shore A hardness: 60 degrees). A plurality of cylindrical protrusions 3 having a diameter of 1.0 mm are formed on the surface of the grip portion 2 as shown in FIG. When the finger comes into contact with the gripping part, the cylindrical protrusion is inclined at a constant angle (20 °) so that the cylindrical protrusion easily falls in one direction, and the tip is cut at a constant angle (45 °). The cut surface is provided with a fine protrusion 6 having a diameter of 0.3 mm at 90 ° to the surface. In this case, the writing tool 1 is cut so that the pen tip side is inclined and the pen tip side is raised so that the writing tool 1 can easily fall down. Van der Waals force is generated between the fingertip touching the gripping part and the surface of the gripping part. When the fingertip touches the surface of the gripping part during gripping, the van der Waals force is generated because the tip of the microprotrusion cut at a constant angle and the area touched by the fingertip increase as shown in FIG. As the force increases, the restoring force of the cylindrical protrusion works and resistance to the back of the writing instrument is generated, so that it is possible to prevent the finger from sliding in the direction of the pen tip. At this time, the contact area of the fingertip is increased due to the fall of the minute protrusion, and the van der Waals force is increased, and resistance due to the fall of the cylindrical protrusion is generated. In other words, when gripping with a weak force, only the anti-slip effect due to the fall of the microprojection works, and when gripping a little strongly, the cylindrical projection falls down in addition to the fall of the microprojection, so it becomes stronger than the anti-slip effect of only the microprojection. Further, when the grip is further strongly held, the collapse of the micro-projections and the collapse of the cylindrical projections are maximized, and the anti-slip effect is also maximized. In addition, when the finger is moved upward or moved away, the resistance is eased when the finger is moved upward, so that it can be changed or released with a light force.

  FIG. 8 is a front view of Example 4 in which the shaft body of the present invention is used for the grip portion 2 of the writing instrument 1. FIG. 9 is an enlarged front view of the grip portion 2 of the fourth embodiment, and FIG. 10 is a rear view of the grip portion of FIG. 9a, 9b, and 10a are enlarged views of the respective portions. Reference numeral 1 is a writing instrument, reference numeral 2 is a grip portion, and reference numeral 3 is a cylindrical protrusion.

  As Example 4, the grip part 2 of the writing instrument 1 (oil-based ballpoint pen) was molded using dimethyl silicone rubber (manufactured by Momentive Performance Materials Japan, TSE2570-6U, Shore A hardness: 40 °). A plurality of cylindrical protrusions 3 having a diameter of 0.5 mm are formed on the surface of the grip portion 2. Assuming that the index finger, thumb, and middle finger abut against the pen tip direction of the writing instrument 1 on the front side, 45 ° on the front side so that each finger tends to fall when force is applied during writing. In this arrangement, the tilt direction is changed by 90 ° with respect to the center line of the writing instrument, and the back side is arranged in the vertical direction with respect to the center line of the writing instrument. The tip of the cylindrical protrusion is cut with the pen tip side raised at a constant angle (45 °) with respect to the arrangement so that when the finger comes into contact with the gripping part, the tip of the cylindrical protrusion is easily tilted in the direction of force. Van der Waals force is generated between the fingertip touching the gripping part and the surface of the gripping part. When the fingertip touches the surface of the gripping part when gripping, the cylindrical protrusion falls down in a certain direction, and the van der Waals force generated by increasing the area where the tip of the cylindrical protrusion cut at a certain angle and the fingertip touches increases. At the same time, the restoring force of the cylindrical protrusion works, and resistance to the back of the writing instrument is also generated. Furthermore, by exhibiting tilting and restoring force in the optimum direction for each finger, it is possible to further prevent the finger from sliding in the direction of the pen tip. In addition, when the finger is moved upward or moved away, the resistance is eased when the finger is moved upward, so that it can be changed or released with a light force.

  11a is an enlarged front view of a plurality of cylindrical protrusions 3 formed on the surface of the grip portion 2 of Example 5, FIG. 11b is a side view of FIG. 11a, and FIG. 11c is a perspective view of FIG. Reference numeral 1 is a writing instrument, reference numeral 2 is a gripping part, reference numeral 3 is a cylindrical protrusion, and reference numeral 6 is a minute protrusion.

  As Example 5, the grip part 2 of the writing instrument 1 (oil-based ballpoint pen) was molded using dimethyl silicone rubber (manufactured by Momentive Performance Materials Japan, TSE2570-6U, Shore A hardness: 40 °). The tip of the cylindrical protrusion is cut at a certain angle so that the cylindrical protrusion easily falls in one direction when the finger comes into contact with the grip portion. In this case, the pen tip side is cut so as to easily fall in the pen tip direction of the writing instrument 1. On the cut surface, minute plate-like protrusions are provided in a direction perpendicular to the pen tip direction. Van der Waals force is generated between the fingertip touching the gripping part and the surface of the gripping part. When the fingertip touches the surface of the gripping part when gripping, the cylindrical protrusion and the minute plate-shaped protrusion fall in a certain direction, and the area where the tip of the minute plate-shaped protrusion touches the fingertip increases, resulting in increased van der Waals force. In addition, the restoring force of the cylindrical protrusions and the minute plate-like protrusions works, and resistance to the writing instrument rearward is also generated, so that it is possible to prevent the finger from sliding in the direction of the pen tip. At this time, the contact area of the fingertip increases due to the fall of the minute plate-like protrusion, and the van der Waals force increases, and resistance due to the fall of the cylindrical protrusion is generated, so that the anti-slip effect changes depending on the gripping force. In other words, when gripping with a weak force, only the anti-slip effect due to the tilting of the microplate-like projections works, and when holding slightly, the cylindrical projections fall in addition to the tilting of the microplate-like projections. When the gripping force is further increased, the minute plate-like protrusions fall and the cylindrical protrusions fall maximum, and the anti-slip effect is maximized. In addition, when the finger is moved upward or moved away, the resistance is eased when the finger is moved upward, so that it can be changed or released with a light force.

  12a is an enlarged front view of a plurality of cylindrical protrusions 3 formed on the surface of the grip portion 2 of Example 6, FIG. 12b is a side view of FIG. 12a, and FIG. 12c is a perspective view of FIG. Reference numeral 1 is a writing instrument, reference numeral 2 is a gripping part, reference numeral 3 is a cylindrical protrusion, and reference numeral 6 is a minute protrusion.

  As Example 6, the holding part 2 of the writing instrument 1 (oil-based ballpoint pen) was molded using an elastomer (Actimer AE-2040S, manufactured by Riken Technos Co., Ltd., Shore A hardness: 40 °). The tip of the cylindrical protrusion is cut at a certain angle so that the cylindrical protrusion easily falls in one direction when the finger comes into contact with the grip portion. In this case, the pen tip side is cut so as to easily fall in the pen tip direction of the writing instrument 1. On the cut surface, minute plate-like protrusions are provided at an angle of 45 ° with respect to the pen tip direction. Van der Waals force is generated between the fingertip touching the gripping part and the surface of the gripping part. When the fingertip touches the surface of the gripping part when gripping, the cylindrical protrusion falls in a certain direction, and the minute plate-like protrusion falls in a 45 ° inclined direction, increasing the area where the tip surface of the minute plate-like protrusion touches the fingertip. As the generated van der Waals force increases, the restoring force of the cylindrical protrusions and micro-plate protrusions with different 45 ° directions works, and resistance to the back of the writing instrument is also generated, preventing finger slipping in the direction of the pen tip I can do it. At this time, the contact area of the fingertip increases due to the fall of the minute plate-like protrusion, and the van der Waals force increases, and resistance due to the fall of the cylindrical protrusion is generated, so that the anti-slip effect changes depending on the gripping force. In other words, when gripping with a weak force, only the anti-slip effect due to the tilting of the microplate-like projections works, and when holding slightly, the cylindrical projections fall in addition to the tilting of the microplate-like projections. When the gripping force is further increased, the minute plate-like protrusions fall and the cylindrical protrusions fall maximum, and the anti-slip effect is maximized. In addition, when the finger is moved upward or moved away, the resistance is eased when the finger is moved upward, so that it can be changed or released with a light force.

  13a is an enlarged front view of a plurality of cylindrical protrusions 3 formed on the surface of the grip portion 2 of Example 7, FIG. 13b is a side view of FIG. 13a, and FIG. 13c is a perspective view of FIG. Reference numeral 1 is a writing instrument, reference numeral 2 is a gripping part, reference numeral 3 is a cylindrical protrusion, and reference numeral 6 is a minute protrusion.

  As Example 7, the holding part 2 of the writing instrument 1 (oil-based ballpoint pen) was molded using an elastomer (Lavalon ME7301C, manufactured by Mitsubishi Chemical Corporation, Shore A hardness: 70 degrees). When the finger comes into contact with the gripping part, the cylindrical protrusion is inclined at a certain angle (20 °) toward the pen tip so that the cylindrical protrusion easily falls in one direction, and the tip is cut at a constant angle (55 °). . In this case, the pen tip side is cut so as to easily fall in the pen tip direction of the writing instrument 1. The cut surface is provided with a plurality of minute protrusions 6 in a direction perpendicular to the surface, and the tip of the minute protrusions are inclined by 45 ° with respect to the pen tip direction. Van der Waals force is generated between the fingertip touching the gripping part and the surface of the gripping part. When the fingertip touches the surface of the gripping part when gripping, the cylindrical protrusion falls in a certain direction, and the microprotrusion falls in a 90 ° tilted direction, resulting in an increase in the contact area between the tip surface of the microprotrusion and the fingertip As the Waals force increases, the restoring force of the cylindrical protrusions and the minute protrusions different in the 45 ° direction works, and resistance to the back of the writing instrument is also generated, so that it is possible to prevent finger slipping in the pen tip direction. At this time, the contact area of the fingertip is increased due to the fall of the minute protrusion, and the van der Waals force is increased, and resistance due to the fall of the cylindrical protrusion is generated. In other words, when gripping with a weak force, only the anti-slip effect due to the fall of the microprojection works, and when gripping a little strongly, the cylindrical projection falls down in addition to the fall of the microprojection, so it becomes stronger than the anti-slip effect of only the microprojection. Further, when the grip is further strongly held, the collapse of the micro-projections and the collapse of the cylindrical projections are maximized, and the anti-slip effect is also maximized. In addition, when the finger is moved upward or moved away, the resistance is eased when the finger is moved upward, so that it can be changed or released with a light force.

  14a is an enlarged front view of a plurality of cylindrical protrusions 3 formed on the surface of the grip portion 2 of Example 8, FIG. 14b is a side view of FIG. 14a, and FIG. 14c is a perspective view of FIG. Reference numeral 1 is a writing instrument, reference numeral 2 is a gripping part, reference numeral 3 is a cylindrical protrusion, and reference numeral 6 is a minute protrusion.

  As Example 8, the holding part 2 of the writing instrument 1 (oil-based ballpoint pen) was molded using an elastomer (Actimer AE-2040S, manufactured by Riken Technos Co., Ltd., Shore A hardness: 40 °). When the finger comes into contact with the grip portion, the tip portion is cut at a certain angle (45 °) so that the columnar protrusion easily falls in one direction. In this case, the pen tip side is cut so as to easily fall in the pen tip direction of the writing instrument 1. The cut surface is provided with a plurality of minute protrusions 6 in a direction perpendicular to the surface, and the tip of the minute protrusions are inclined by 45 ° with respect to the pen tip direction. Van der Waals force is generated between the fingertip touching the gripping part and the surface of the gripping part. When the fingertip touches the surface of the gripping part when gripping, the cylindrical protrusion falls down in a certain direction, and the microprotrusion falls in a direction inclined by 90 °, resulting in an increase in the area of contact between the tip surface of the microplate-like protrusion and the fingertip. As the van der Waals force increases, the restoring force of the cylindrical protrusions and micro-protrusions that differ in the 45 ° direction works, and resistance to the back of the writing instrument is also generated, so it is possible to prevent the finger from sliding in the direction of the pen tip . At this time, the contact area of the fingertip is increased due to the fall of the minute protrusion, and the van der Waals force is increased, and resistance due to the fall of the cylindrical protrusion is generated. In other words, when gripping with a weak force, only the anti-slip effect due to the fall of the microprojection works, and when gripping a little strongly, the cylindrical projection falls down in addition to the fall of the microprojection, so it becomes stronger than the anti-slip effect of only the microprojection. Further, when the grip is further strongly held, the collapse of the micro-projections and the collapse of the cylindrical projections are maximized, and the anti-slip effect is also maximized. In addition, when the finger is moved upward or moved away, the resistance is eased when the finger is moved upward, so that it can be changed or released with a light force.

  FIG. 15 is an enlarged side view of a plurality of annular protrusions 3 formed on the surface of the grip portion 2 of the ninth embodiment. Reference numeral 1 is a writing instrument, reference numeral 2 is a gripping part, reference numeral 3 is an annular protrusion, and reference numeral 6 is a minute plate-like protrusion.

  As Example 9, the grip part 2 of the writing instrument 1 (oil-based ballpoint pen) was molded using an elastomer (Actimer AE-2040S, manufactured by Riken Technos Co., Ltd., Shore A hardness: 40 °). An annular projection is provided on the surface of the gripping portion 2 in a circumferential shape, and a plurality of micro annular projections 6 are provided on the tip of the annular projection, and the tip of the minute annular projection is in contact with the gripping portion of the finger. When cut, it is cut at a certain angle (45 °) so that it tends to fall in one direction. In this case, the pen tip side is cut so as to easily fall in the pen tip direction of the writing instrument 1. Van der Waals force is generated between the fingertip touching the gripping part and the surface of the gripping part. When the fingertip touches the surface of the gripping part when grasping, the annular projection and the minute annular projection fall in a certain direction, and the area where the tip of the minute annular projection and the fingertip touch increases, and the van der Waals force generated increases. Since the restoring force of the annular protrusion and the minute annular protrusion acts and resistance to the back of the writing instrument is generated, it is possible to prevent the finger from sliding in the direction of the pen tip. At this time, the contact area of the fingertip increases due to the fall of the minute annular protrusion, and the van der Waals force increases, and resistance due to the fall of the cylindrical protrusion occurs, so the effect of the anti-slip changes depending on the gripping force. In other words, when gripping with a weak force, only the anti-slip effect due to the fall of the micro-annular protrusion works, and when gripping a little strongly, the cylindrical protrusion falls down in addition to the fall of the micro-annular protrusion, so it is stronger than the anti-slip effect of only the micro-annular protrusion When it is gripped more strongly, the fall of the minute annular projection and the fall of the cylindrical projection are maximized, and the anti-slip effect is also maximized. In addition, when the finger is moved upward or moved away, the resistance is eased when the finger is moved upward, so that it can be changed or released with a light force.

16a is an enlarged side view of a plurality of cylindrical protrusions 3 formed on the surface of the grip portion 2 of Example 10, and FIG. 16b is a perspective view of FIG. 16a. Reference numeral 1 is a writing instrument, reference numeral 2 is a grip portion, and reference numeral 3 is a cylindrical protrusion.
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  As Example 10, the grip portion 2 of the writing instrument 1 (oil-based ballpoint pen) was molded by injection molding using an elastomer (Lavalon MJ6301C, manufactured by Mitsubishi Chemical Corporation, Shore A hardness: 60 degrees). A plurality of cylindrical projections 3 having a diameter of 0.5 mm and heights of 2.0 mm and 1.5 mm are formed on the surface of the grip portion 2. When the finger comes into contact with the gripping part, the tip of the columnar protrusion is 30 ° for the columnar protrusion with a height of 2.0 mm and the angle of 45 ° for the 1.5 mm columnar protrusion so that the columnar protrusion easily falls in one direction. It has been cut. In this case, the pen tip side is cut so as to easily fall in the pen tip direction of the writing instrument 1. Van der Waals force is generated between the fingertip touching the gripping part and the surface of the gripping part. When the fingertip touches the surface of the gripping part when gripping, the 2.0 mm, 30 ° columnar protrusion first falls in a certain direction. The van der Waals force generated by increasing the area of contact between the tip of the cylindrical projection cut at a certain angle and the fingertip increases, the restoring force of the cylindrical projection works, and resistance to the back of the writing instrument also occurs. It is possible to prevent the finger from sliding forward. If the 2.0 mm and 30 ° columnar protrusions are tilted to some extent by gripping them more strongly, the fingertip touches the 1.5 mm and 45 ° columnar protrusions, and the 1.5 mm and 45 ° columnar protrusions also fall in a certain direction. As the van der Waals force generated from the increased contact area between the tip of the cylindrical projection cut at a certain angle and the fingertips increases, the restoring force of the cylindrical projection works, and resistance to the writing instrument is also generated. It is possible to further prevent the finger from sliding in the direction of the pen tip. In addition, when the finger is moved upward or moved away, the resistance is eased when the finger is moved upward, so that it can be changed or released with a light force. In this embodiment, the tip of the cylindrical protrusion is cut at a constant angle of 45 ° and 30 °, but a plurality of different angles may be combined, and they may be arranged in a certain range or alternately. You may distribute. By combining the cylindrical protrusions whose front end portions are cut at a plurality of angles, it is possible to obtain the effect of increasing the van der Waals force for various ways of holding.

  As Comparative Example 1, the gripping part 2 of the writing instrument 1 (oil-based ballpoint pen) was molded without projections on the surface using an elastomer (Lavalon T320C, manufactured by Mitsubishi Chemical Corporation, Shore A hardness: 15 degrees). The grip surface has a stickiness peculiar to low-hardness elastomers, so it has a high anti-slip effect when gripped, but it will stick to your finger when you hold it or release it, so it requires discomfort and extra force turn into.

  As Comparative Example 2, the gripping part 2 of the writing instrument 1 (oil-based ballpoint pen) is dimple-shaped on the surface using dimethyl silicone rubber (Momentive Performance Materials Japan, TSE2570-6U, Shore A hardness: 40 °). Many holes were drilled. When gripped, the inside of the dimple is depressurized, so that it has a high anti-slip effect by sticking to the finger. However, since it sticks to the finger when it is changed or released, uncomfortable feeling and extra force are required.

  The present invention relates to an elastic body in which a substance having pseudo-adhesiveness is arranged on the inner surface of a space in an elastic body having a space inside. Examples of the use of elastic bodies include cushions, seats, mattresses, writing instruments such as mechanical pencils, ballpoint pens, correction pens, tools such as cutters, engraving swords, and drivers, PDAs (personal digital assistance) and electronic notebooks. There are various types such as gripping parts of shafts such as input pens, bicycle handles, etc.

DESCRIPTION OF SYMBOLS 1 Writing instrument 2 Grasping part 3 Protrusion 4 Finger 5 Surface where van der Waals force is generated 6 Micro protrusion

Claims (4)

  A shaft body having an elastically deformable surface structure having a surface structure in which van der Waals force is generated between the shaft body surface and a pressing surface.   The shaft body according to claim 1, wherein a flexible projection is provided on the surface of the shaft body, and a van der Waals force generated between the shaft body and the pressing surface during the flexing is increased.   The shaft body according to claim 1, wherein a protrusion that is flexible in one direction is provided on the surface of the shaft body, and the van der Waals force generated between the shaft body and the pressing surface is increased. The shaft body according to claim 1, wherein a flexible projection is further provided on a projection surface of the flexible projection.

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