JP2007152617A - Member for gripping part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a member for a gripping part which is designed for covering a part or the whole of an article in various spheres with which fingers or the hand often comes into direct contact, and which hardly causes a slip, enables attainment of a supple feel and little brings about a fatigue even in gripping for a long time. <P>SOLUTION: The member 2 for the gripping part is designed for the gripping part 6 which is provided for grips for writing implements, sporting goods, manual tools or the like, handles for vehicles, machine tools, buildings or the like, or the gripping parts of electronic devices, toys, toilet accessories or the like and with which the fingers or the hand often comes into direct contact, and is constituted of an elastic elastomer foam. Hollows 5 of a foamed cell structure are made to appear at least in a part of the surface of the member. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to grips for writing instruments such as mechanical pencils, ballpoint pens, pencils, brushes, tennis rackets, badminton rackets, table tennis rackets, baseball bats, golf clubs, ski stocks, grips for sports equipment such as fishing rods, hammers, etc. , Grips for hand tools such as drivers and pliers, handles for vehicles such as automobiles, motorcycles, motorbikes, bicycles and tricycles, handles for various industrial machines such as machine tools and farm equipment, revolving doors, sashes, shutters, etc. In addition to handles for buildings, makeup parts such as personal computers, personal information portable terminals, mobile phones, remote controllers, toy holding parts such as building blocks and stuffed animals, puffs, eyebrow brushes, toothbrushes, etc. Some articles in various fields where fingers or hands may come into direct contact, such as grips on tools Relates gripper member for covering the whole.

  Conventionally, as materials for grips to be attached to grips such as pencils, ballpoint pens, etc., rackets, golf clubs, fishing rods, etc., the materials and shapes that are hard to slip even when gripped for a long time are used. Invented and improved on products. In recent years, materials and shapes that do not slip are not satisfied alone, and sensory touches such as a moist feeling when grasped have been emphasized. However, satisfying all of these has been extremely difficult.

For example, in the case of a pen grip, as disclosed in Patent Document 1, a synthetic resin grip member having a Shore A hardness of 40 degrees to 60 degrees is proposed, and in Patent Document 2, the Shore A hardness is 10 degrees or more. A grip member using a synthetic resin of less than 40 degrees has been proposed. Patent Document 3 and Patent Document 4 disclose using a shape memory resin so that the grip portion has a gripped shape.
JP-A-2-141295 JP-A-3-292200 JP-A-4-59300 JP-A-9-272294

  However, any of the grip members proposed in Patent Documents 1 to 4 has a problem that it is very slippery when a finger or a hand is wet or wet with moisture on the surface.

  Accordingly, the present invention provides grips for conventional writing instruments, sports equipment, hand tools, etc., handles for vehicles, machine tools, buildings, etc., electronic devices, toys, cosmetic tools, etc. In order to solve the problem of the gripping member made of elastic elastomer foam for covering the gripping part that is in direct contact with the finger or hand, the finger or hand may be in direct contact By absorbing the moisture adhering to the surface of the gripping part member for covering a part or the whole of an article in various fields into the gripping part member, it is extremely slippery and has a moist feeling. It is an object of the present invention to provide a gripping member that is obtained and has a low degree of fatigue even when gripped for a long time.

  In order to achieve the above-described problems, the gripping member according to claim 1 includes grips for writing instruments, sports equipment, hand tools, etc., handles for vehicles, machine tools, buildings, etc. At least part of the surface of a gripping member made of an elastic elastomer foam for covering a gripping part that can be in direct contact with a finger or hand, which is a gripping part of an electronic device, a toy, a cosmetic tool, etc. The feature is that the concave portion of the foam cell structure is exposed.

  The invention according to claim 2 adds 20% to 80% of the area where the concave portion of the cell structure is exposed to the surface of the entire surface area of the gripping member in addition to the structure according to claim 1. It is characterized by occupying.

  The invention described in claim 3 is characterized in that, in addition to the configuration described in claim 1 or 2, the concave portions of the foamed cell structure are evenly distributed over the entire gripping portion of the gripping member.

  The invention described in claim 4 is characterized in that, in addition to the structure described in any one of claims 1 to 3, the average cell diameter of the concave portions of the foamed cell structure is 10 to 300 μm.

  Since this invention has the above-described configuration, according to the invention described in claim 1, moisture adhering to the surface is absorbed into the foamed cell exposed on the surface of the elastic elastomer foam, Since the characteristics of the elastic elastomer foam itself are maintained, it is possible to provide a gripping member that is extremely non-slip, has a moist feel, and has a low degree of fatigue even when gripped for a long time.

  According to invention of Claim 2, since the recessed part of foam cell structure occupies 20 to 80% of the whole holding part of the member for holding parts, in addition to the effect of Claim 1, of the member for holding parts Moisture adhering to the surface can be sufficiently taken into the cell, and the presence of a dry cell wall that maintains the overall rigidity provides a firm grip performance.

  According to the third aspect of the present invention, since the concave portions of the foamed cell structure are evenly distributed throughout the gripping portion of the gripping member, in addition to the effect of the first or second aspect, Since moisture can be absorbed in any part of the finger or hand when the member is gripped, the gripping member can be firmly gripped by exhibiting a reliable anti-slip effect.

  According to invention of Claim 4, since the average cell diameter of the recessed part of the said foaming cell structure is 10-300 micrometers, in addition to the effect as described in any one of Claims 1 thru | or 3, it adhered to the surface. Moisture can be sufficiently taken into the cell, and a gripping member having a pleasant touch that can withstand long-term use with a sufficient elastomer skeleton forming the cell structure can be obtained.

  Hereinafter, a member for a gripping part according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing an example in which a gripping member according to an embodiment of the present invention is applied to a writing instrument. FIG. 2 is a perspective view showing an example in which the gripping member according to the embodiment of the present invention is applied to a badminton racket.

  The gripping member 2 in the case of the writing instrument 1 shown in FIG. 1 is a tubular elastic elastomer foam having both ends open, and its outer shape is a grip shape that can be easily grasped with a finger. The gripping member 2 having an inner diameter slightly smaller than the outer diameter of the writing instrument 1 is used by being fitted near the pen tip that holds the writing instrument 1.

  In the case of the writing instrument 1, the inner surface of the gripping member 2 is brought into close contact with the outer surface of the writing instrument 1 by the elastic restoring force generated when the gripping member 2 is expanded and fitted into the writing instrument 1. On the other hand, since the surface of the elastic elastomer foam itself has a non-slip characteristic, it is fixed at a predetermined position even after being attached to the writing instrument 1, and an external force that moves during use. Even if it works, it will not come off easily. In order to increase the degree of fixation, an adhesive may be applied between the outer surface of the writing instrument 1 and the inner surface of the gripping member 2.

  When the elastic elastomer foam tubular body is covered as it is, the gripping member 2 is easier to wear when the inner surface of the gripping member 2 and the outer surface of the writing instrument 1 are more slippery. It is preferable not to remove the skin layer on the inner surface of the member 2.

  The gripping member 2 in the case of the badminton racket 3 shown in FIG. 2 is a tape-like elastic elastomer foam having a certain width, and extends over a predetermined length on the handle 4 of the badminton racket 3. It is used by wrapping at an angle (spiral) without gaps.

  In the case of the badminton racket 3, the gripping member 2 is a tape-like one, and a double-sided tape or adhesive is applied to one side, and the double-sided tape or adhesive is used to attach to the handle 4 part of the badminton racket 3. It is good to attach.

  When the gripping member 2 is affixed to the handle 4 using a double-sided tape or adhesive, the adhesive strength of the double-sided tape or adhesive increases when the gripping member 2 has a smooth surface. It is preferable not to remove the skin layer on the surface to be attached to the handle 4.

  3 to 6 are enlarged plan views showing the outer surface of the gripping member.

  In FIG. 3, the concave portion 5 of the cell structure of the elastic elastomer foam is exposed so as to exhibit a circumferential stripe pattern on the outer surface of the gripping member 2. In FIG. 4, the concave portion 5 of the cell structure of the elastic elastomer foam is exposed so as to exhibit an axial stripe pattern on the outer surface of the gripping member 2. In FIG. 5, the concave portion 5 of the elastic elastomer foam cell structure is exposed on the outer surface of the gripping member 2 so as to exhibit a spiral stripe pattern along the axial direction. In FIG. 6, the concave portion 5 of the cell structure of the elastic elastomer foam is exposed so as to exhibit a polka dot pattern on the outer surface of the gripping member 2.

  The concave portion 5 of the elastic elastomer foam cell structure is a portion that absorbs moisture. If the concave portion 5 of the elastic elastomer foam cell structure is not evenly distributed on the outer surface of the grip portion member, When the member is gripped, there are places where the amount of moisture absorbed is large and places where the amount of moisture is absorbed is small, and the portion for absorbing moisture is slippery and cannot grip the gripping member firmly. Therefore, in any of FIGS. 3 to 6, it is necessary that the concave portions 5 of the cell structure of the elastic elastomer foam are evenly distributed on the outer surface of the gripping member 2.

  FIG. 7 is an enlarged sectional view of the surface portion showing the cell structure of the elastic elastomer foam.

  According to an experiment conducted by the inventor, it is desirable that the ratio of the concave portion 5 of the cell structure exposed on the surface of the gripping member 2 to the entire area of the gripping member 2 is 20 to 80%. I can say that. If this ratio is less than 20%, the moisture adhering to the surface of the gripping member 2 cannot be sufficiently taken into the cell and the effect of making it difficult to slip is insufficient. If the ratio of the recessed part 5 of the exposed cell structure exceeds 80%, the effect of taking up moisture is sufficient, but the ratio of the dried cell wall 7 becomes small, and the grip performance for gripping firmly becomes insufficient. . The ratio of the exposed concave portions 5 of the cell structure may be determined in consideration of the sweaty state of the user and the humidity during use. Moreover, when using it for the grip for women and children who do not require a strong gripping force, the ratio of the recessed portions 5 of the exposed cell structure may be increased.

  Further, according to an experiment conducted by the inventor, the thickness of the elastic elastomer foam corresponding to the grip portion 6 of the grip portion member 2 is preferably 1 to 15 mm when mounted on the handle 4 or the like. I can say that. If the thickness of the elastic elastomer foam is less than 1 mm, the amount of compression of the gripping member 2 when gripped is too small to obtain an elastic restoring force, so a strong force is required to grip the grip and the grip is held for a long time. And fatigue. When the thickness of the elastic elastomer foam exceeds 15 mm, if the gripping member 2 is compressed too much and the gripping force is weak, the gripping force will wobble. I get tired. That is, when the thickness of the elastic elastomer foam is 1 to 15 mm when mounted on the handle 4 or the like, it has a firm grip performance even if it is gripped with a weak force, An optimum gripping member 2 with less fatigue is obtained.

  In the case of a grip with a small body shape that is supported by a finger, such as a grip for a writing instrument or a grip for a makeup tool, the size of the grip member 2 is limited due to ease of use. For the wall thickness, a small value of 1 to 15 mm is selected. Conversely, grips for sports equipment, grips for hand tools, handles for vehicles, handles for various industrial machines, handles for buildings, grips for electronic devices, grips for toys, etc. In the case of a grip having a relatively large body shape as gripped, the thickness of the gripping member 2 is selected to be a large value from 1 to 15 mm due to strength problems.

  Furthermore, according to experiments conducted by the inventors, it can be said that the average cell diameter of the cell structure exposed on the surface of the elastic elastomer foam is preferably 10 to 300 μm. If the average cell diameter of the cell structure is less than 10 μm, the size of the water droplet is too small to allow the moisture adhering to the surface to be sufficiently taken into the cell, and the effect of making it difficult to slip is insufficient. . If the average cell diameter of the cell structure exceeds 300 μm, the skeleton of the elastomer forming the cell structure becomes thin and the texture becomes rough, so that the quality is lowered, and the mechanical properties are extremely lowered. Cannot withstand use. In particular, it cannot be used for products that are subject to impact such as sports grips. Note that the cell diameter of the cell structure changes depending on the chemical balance between the foaming agent and the crosslinking agent, so even if the same processing machine is used, the type and amount of the foaming agent and the type and amount of the crosslinking agent are changed. In addition, since it is possible to control by changing manufacturing conditions such as heating temperature and heating time, products having various cell diameters can be manufactured using a normal manufacturing line.

  In order to reduce the cell diameter, the amount of the foaming agent relative to the crosslinking agent can be reduced, or the heating temperature can be increased to promote the decomposition of the crosslinking agent. In order to increase the cell diameter, conversely, the amount of the foaming agent relative to the crosslinking agent can be increased, or the heating temperature can be lowered to suppress decomposition of the crosslinking agent. Further, the cell diameter can be adjusted by changing the type of foaming agent and using different foaming temperatures and different gas generation amounts.

  The material of the elastic elastomer foam is foamed urethane rubber, foamed silicone rubber, foamed fluororubber, foamed styrene butadiene rubber, foamed chloroprene rubber, etc., but foamed silicone rubber with excellent weather resistance, feel and colorability is used. preferable.

  The elastic elastomer foam is usually subjected to primary molding by extrusion molding, press molding, calendar molding, or the like, but a skin layer is formed on the outer surface, and the concave portion 5 of the cell structure is not exposed on the surface. . Therefore, it is necessary to remove the skin layer on the outer surface of the elastic elastomer foam subjected to primary molding. As a method for removing the skin layer, a known slicing method or a cutting method using a grindstone or a drill may be used. In addition, at the time of a cutting process, the large uneven | corrugated shape which makes it easy to grip the member 2 for holding parts, and the small uneven | corrugated shape which exhibits the anti-slip | skid effect can also be provided.

  The grip portion member 2 of the present invention having the above-described configuration includes a grip for golf clubs, a grip for rackets such as tennis, badminton, squash, and racquetball, and a grip for sports equipment such as ski stock. It can be applied to various fields such as grips for vehicles such as automobiles, motorcycles and motorbikes, grips for hand tools such as drivers and hammers, grips for handles of various mechanical devices, etc. In the member 2 for a part, the "moist feeling" which is a familiar feeling to a hand is excellent, and even if it gets wet with sweat or water, the characteristic of being "non-slip" can be exhibited.

[Example 1]
100 parts by mass of silicone rubber compound KE-151KU (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.), 4 parts by mass of crosslinking agent C-3 (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.), foaming agent KE-P -13 (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.), 3 parts by mass, kneaded using two rolls, extruded using an extrusion molding method, vulcanized at 175 ° C for 5 minutes A tubular elastic elastomer foam having a cross section with an inner diameter of 8 mm and a wall thickness of 2.5 mm was obtained. This was then placed in an oven and post-treated at 200 ° C. for 10 hours.

  Next, the post-treated tubular elastic elastomer foam is cut into a length of 300 mm, and a thickness of 0.5 mm is ground from the outer diameter using a cylindrical grinder through a 9 mm metal shaft on the inner diameter side. The gripping member 2 having an inner diameter of 8 mm and a wall thickness of 2 mm (outer diameter of 12 mm) from which the layer was removed was obtained.

  When the concave portion 5 of the cell structure exposed on the surface of the gripping member 2 was measured, the average cell diameter was 150 μm, and the area of the portion where the concave portion 5 of the cell structure was exposed on the surface was the entire gripping portion 6. It was 50% of the area.

  Next, the metal shaft is pulled out, cut into a length of 40 mm, and mounted on the writing instrument 1 as the mounting core, and the grip feeling, fatigue level, and grip holding force when water droplets are attached are determined by a sensory test. confirmed. The results are shown in Table 1.

[Example 2]
100 parts by mass of silicone rubber compound KE-151KU (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.), 4 parts by mass of crosslinking agent C-3 (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.), foaming agent KE-P -13 (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.), 3 parts by mass, kneaded using two rolls, extruded using an extrusion molding method, vulcanized at 175 ° C for 5 minutes A tubular elastic elastomer foam having a cross section with an inner diameter of 8 mm and a wall thickness of 2.5 mm was obtained. This was then placed in an oven and post-treated at 200 ° C. for 10 hours.

  Next, the post-processed tubular elastic elastomer foam is cut into a length of 300 mm, and a thickness of 0.2 mm is ground from the outer diameter using a cylindrical grinder through a 9 mm metal shaft on the inner diameter side. The gripping member 2 having an inner diameter of 8 mm and a wall thickness of 2.3 mm (outer diameter of 12.6 mm) from which the layer was removed was obtained.

  When the concave portion 5 of the cell structure exposed on the surface of the gripping member 2 was measured, the average cell diameter was 150 μm, and the area of the portion where the concave portion 5 of the cell structure was exposed on the surface was the entire gripping portion 6. It was 20% of the area.

  Next, the metal shaft is pulled out, cut into a length of 40 mm, and mounted on the writing instrument 1 as the mounting core, and the grip feeling, fatigue level, and grip holding force when water droplets are attached are determined by a sensory test. confirmed. The results are shown in Table 1.

[Example 3]
100 parts by mass of silicone rubber compound KE-151KU (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.), 4 parts by mass of crosslinking agent C-3 (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.), foaming agent KE-P -13 (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.), 3 parts by mass, kneaded using two rolls, extruded using an extrusion molding method, vulcanized at 175 ° C for 5 minutes A tubular elastic elastomer foam having a cross section with an inner diameter of 8 mm and a wall thickness of 2.5 mm was obtained. This was then placed in an oven and post-treated at 200 ° C. for 10 hours.

  Next, the post-processed tubular elastic elastomer foam was cut into a length of 300 mm, and a skin having a thickness of 1.3 mm from the outer diameter was ground using a cylindrical grinder through a 9 mm metal shaft on the inner diameter side. A gripping member 2 having an inner diameter of 8 mm and a wall thickness of 1.2 mm (outer diameter of 10.4 mm) from which the layer had been removed was obtained.

  When the concave portion 5 of the cell structure exposed on the surface of the gripping member 2 was measured, the average cell diameter was 150 μm, and the area of the portion where the concave portion 5 of the cell structure was exposed on the surface was the entire gripping portion 6. It was 80% of the area.

  Next, the metal shaft is pulled out, cut into a length of 40 mm, and mounted on the writing instrument 1 as the mounting core, and the grip feeling, fatigue level, and grip holding force when water droplets are attached are determined by a sensory test. confirmed. The results are shown in Table 1.

[Example 4]
100 parts by mass of silicone rubber compound KE-151KU (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.), 4 parts by mass of crosslinking agent C-3 (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.), foaming agent KE-P -13 (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.) 2 parts by mass, kneaded using two rolls, extruded using an extrusion molding method, and then vulcanized at a temperature of 180 ° C. for 5 minutes A tubular elastic elastomer foam having a cross section with an inner diameter of 8 mm and a wall thickness of 8.0 mm was obtained. This was then placed in an oven and post-treated at 200 ° C. for 10 hours.

  Next, the tubular elastic elastomer foam that has been post-processed is cut to a length of 300 mm, and a thickness of 1.5 mm from the outer diameter is ground by using a cylindrical grinder through a 9 mm metal shaft on the inner diameter side, whereby A gripping member 2 having an inner diameter of 8 mm and a wall thickness of 1 mm (outer diameter of 10 mm) from which the layer was removed was obtained.

  When the concave portion 5 of the cell structure exposed on the surface of the gripping member 2 was measured, the average cell diameter was 150 μm, and the area of the portion where the concave portion 5 of the cell structure was exposed on the surface was the entire gripping portion 6. It was 50% of the area.

  Next, the metal shaft is pulled out, cut into a length of 40 mm, and mounted on the writing instrument 1 as the mounting core, and the grip feeling, fatigue level, and grip holding force when water droplets are attached are determined by a sensory test. confirmed. The results are shown in Table 1.

[Example 5]
For 100 parts by mass of silicone rubber compound KE-151KU (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.), 3 parts by mass of crosslinking agent C-3 (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.), foaming agent KE-P -13 (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.), 4 parts by mass, kneaded using two rolls, extruded using extrusion molding method, vulcanized for 5 minutes at 175 ° C A tubular elastic elastomer foam having an inner diameter of 8 mm and a wall thickness of 8.0 mm was obtained. This was then placed in an oven and post-treated at 200 ° C. for 10 hours.

  Next, the post-treated tubular elastic elastomer foam is cut into a length of 300 mm, and a thickness of 0.5 mm is ground from the outer diameter using a cylindrical grinder through a 9 mm metal shaft on the inner diameter side. The gripping member 2 having an inner diameter of 8 mm and a thickness of 7 mm (outer diameter of 22 mm) from which the layer was removed was obtained.

  When the concave portion 5 of the cell structure exposed on the surface of the gripping member 2 was measured, the average cell diameter was 10 μm, and the area of the portion where the concave portion 5 of the cell structure was exposed on the surface was the entire gripping portion 6. It was 50% of the area.

  Next, the metal shaft is pulled out, cut into a length of 40 mm, and mounted on the writing instrument 1 as the mounting core, and the grip feeling, fatigue level, and grip holding force when water droplets are attached are determined by a sensory test. confirmed. The results are shown in Table 1.

[Comparative Example 1]
Comparative Example 1 is the same as Example 1, with respect to 100 parts by mass of silicone rubber compound KE-151KU (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.), cross-linking agent C-3 (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.). ) After adding 4 parts by mass and 3 parts by mass of the foaming agent KE-P-13 (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.), kneading using two rolls, and extruding using an extrusion method. Vulcanization was carried out at a temperature of 175 ° C. for 5 minutes to obtain a tubular elastic elastomer foam having an inner diameter of 8 mm and a wall thickness of 2 mm. This was then placed in an oven and post-treated at 200 ° C. for 10 hours.

  However, in Comparative Example 1, unlike Example 1, the gripping member 2 having an outer diameter of 12 mm was obtained without performing the grinding process and leaving the skin layer.

This gripping member 2 was cut into a length of 40 mm and mounted on the writing instrument 1 as a mounting core, and the grip feeling, fatigue level, and grip holding force when water droplets were adhered were confirmed by a sensory test. . The results are shown in Table 1.
[Sensory test of gripping members]

  About Examples 1-5 and the comparative example 1, the sensory test of the member for holding | grip for writing instruments was done in the way shown below, and grip force when a grip feeling, a fatigue degree, and a water droplet were made to adhere was confirmed. The results are shown in Table 1.

  For the sensory test of the gripping member for writing instruments, the grips of Examples 1 to 5 and Comparative Example 1 are attached to the gripping part of a mechanical pencil in which a general commercially available grip-free main body is straight. Ten pencils, five adult males and five adult females, made actual writing work for mechanical pencils. As a result, the results of the pass / fail judgment of 10 people were tabulated on the grip feeling during use, the degree of fatigue after use, and the grip strength when water drops adhered during use.

  As for the grip feeling, the feeling when gripped for the first time and the feeling during writing were judged as good by 10 out of 10 ◎ when 7-9 out of 10 were judged as good. A case where 4 to 6 people were judged to be good was evaluated as Δ, and a case where 3 or less people among 10 people were judged to be good was evaluated as x.

  About the fatigue level, it was judged that 10 out of 10 people were not feeling tired about the fatigue level of hands and fingers immediately after copying 1000 characters. ◎ 7-9 out of 10 people felt tired What was determined not to be ◯, what was determined that 4 to 6 out of 10 did not feel fatigue, Δ was determined that 3 or less out of 10 did not feel fatigue.

  Regarding the grip strength when water drops are attached, 10 out of 10 people judged that they did not feel fatigue about the fatigue level of their hands and fingers immediately after copying the 400 characters after immersing their hands in water for 10 seconds. 10 to 10 out of 10 people judged not to feel fatigue ○ 4 to 10 out of 10 people judged not to feel fatigue △ 3 out of 10 people felt no fatigue Was determined as x.

It is the perspective view which showed the example at the time of applying the member for holding parts which concerns on embodiment of this invention to a writing instrument. It is the perspective view which showed the example at the time of applying the member for holding parts which concerns on embodiment of the invention to a badminton racket. It is the enlarged plan view which showed the state which has exposed the recessed part of the cell structure so that the striped pattern of the circumferential direction may be exhibited on the outer surface of the member for holding parts which concerns on the embodiment. It is the enlarged plan view which showed the state which has exposed the recessed part of the cell structure so that the striped pattern of an axial direction may be exhibited on the outer surface of the member for holding parts which concerns on the embodiment. It is the enlarged plan view which showed the state which has exposed the recessed part of the cell structure so that the outer surface of the member for holding parts which concerns on the embodiment may show the spiral striped pattern along an axial direction. It is the enlarged plan view which showed the state which has exposed the recessed part of the cell structure so that a polka dot pattern may be exhibited on the outer surface of the member for holding parts which concerns on the embodiment. It is an expanded sectional view of the surface part which showed the cell structure of the elastic elastomer foam.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Writing instrument 2 Gripping part member 3 Badminton racket
4 Handle 5 Concave part of cell structure
6 Grasping part 7 Cell wall

Claims (4)

Grip for writing instruments, sports equipment, hand tools, etc., handles for vehicles, machine tools, buildings, etc. and gripping parts for electronic devices, toys, cosmetic tools, etc. A member for a gripping part made of an elastic elastomer foam for covering a gripping part that may be formed, wherein a concave portion of a foamed cell structure is exposed on at least a part of the surface thereof. 2. The gripping member according to claim 1, wherein an area where the concave portion of the cell structure is exposed on a surface occupies 20 to 80% with respect to a total surface area of the gripping member. 3. The gripping member according to claim 1, wherein the concave portions of the foamed cell structure are evenly distributed throughout the gripping portion of the gripping member. 4. The gripping member according to claim 1, wherein an average cell diameter of the concave portion of the foamed cell structure is 10 to 300 μm.

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