JP2020049952A - Friction member and thermochromic writing implement with friction member - Google Patents

Abstract

To provide a friction member capable of easily changing a color of handwriting written by thermochromic ink, while hardly damaging a paper surface as well as hardly blurring printed characters, and a thermochromic writing implement having said friction member.SOLUTION: An friction member 11 is used for erasing handwriting written by thermochromic ink. The friction member 11 has a Taber abrasion property of 10 mg or more according to CS-17 in Taber abrasion test stipulated in JIS K7204. Furthermore, the friction member 11 preferably has a durometer D hardness property of 30 or more, the durometer D hardness being stipulated in JIS K6203. The friction member 11 also preferably contains a phthalic acid-based plasticizer.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a friction member and a thermochromic writing instrument provided with the friction member.

  2. Description of the Related Art A friction member that rubs a handwriting made of a thermochromic ink to discolor or erase color and a writing instrument including the friction member are known (for example, Patent Document 1). Patent Literature 1 describes that the friction member is formed of a low-wear elastic material so that wear debris hardly occurs due to friction with a paper surface or the like.

International Publication No. 2008/105227

  However, since the friction member described in Patent Document 1 is formed of a low-wear material, a handwriting of the thermochromic ink written on a paper surface, such as a book, on which characters or the like printed in advance exists. In doing so, not only the handwriting of the thermochromic ink is discolored or erased, but also the printed characters are rubbed, and as a result, the paper surface may be stained. Further, a friction member formed from a low-wear material may be damaged to the paper if it is strongly rubbed.

  The present invention provides a thermochromic writing implement including a friction member that can easily change the color of the handwriting of the thermochromic ink, does not damage the paper surface, and does not blur printed characters.

  According to one aspect of the present invention, in a friction member for erasing handwriting with a thermochromic ink, a Taber abrasion amount by a Taber abrasion test specified in JIS K7204 is 10 mg or more in CS-17. A friction member is provided. That is, according to this aspect, the friction member is appropriately worn when rubbing the handwriting with the thermochromic ink, so that the handwriting can be erased without damaging the paper surface and without blurring the printed characters.

  According to another aspect, there is provided a friction member having a durometer D hardness specified in JIS K6203 of 30 or more. That is, according to this aspect, since the friction member can have a predetermined hardness, a more stable rubbing operation can be performed.

  According to another aspect, there is provided a friction member including a phthalic acid-based plasticizer. That is, according to this aspect, since the friction member is more easily worn, the handwriting can be erased without damaging the paper surface and blurring the printed characters.

  According to another aspect, there is provided a thermochromic writing instrument including the friction member according to the above aspect.

  According to another aspect, there is provided a thermochromic writing implement, wherein the friction member is covered by a transparent or translucent cover member when not in use.

  In addition, the thermochromic member includes a shaft cylinder having a front shaft and a rear shaft, and the friction member is provided at a rear end of the front shaft and is arranged in a front end of the rear shaft. A sex writing instrument is provided.

  According to another aspect, a shaft cylinder, a plurality of writing bodies disposed in the shaft cylinder, a rotation feeding mechanism, and a cover member, wherein the rotation feeding mechanism cooperates with the cover member Thus, a thermochromic writing implement is provided, in which a plurality of the cursive objects can be sequentially fed out.

  According to another aspect, the friction member has a triangular shape in a cross section exposed at a rear end, and the apex of the triangle is formed in a circular arc shape, and the radius of curvature of the arc is the rear end side. There is provided a thermochromic writing implement characterized in that it is larger.

  According to an aspect of the present invention, a common feature is to provide a thermochromic writing instrument including a friction member and a friction member that can easily change the color of the handwriting of the thermochromic ink, do not damage the paper surface, and do not blur printed characters. It works.

1A is a side view, and FIG. 2B is a longitudinal sectional view, illustrating a writing instrument including a friction member according to a first embodiment of the present invention. FIG. 2 is a perspective view of a rear end portion of the writing instrument of FIG. 1. FIG. 2 is another perspective view of a rear end portion of the writing instrument of FIG. 1. 6A and 6B show a writing instrument provided with a friction member according to a second embodiment of the present invention, wherein FIG. 7A is a side view and FIG. FIG. 5 is a perspective view of a front shaft of the writing instrument of FIG. 4. FIGS. 7A and 7B show a writing instrument provided with a friction member according to a third embodiment of the present invention, wherein FIG. 7A is a side view and FIG. FIG. 7 is another longitudinal sectional view of the writing instrument of FIG. 6. FIG. 10 shows a refill storage container provided with a friction member according to a fourth embodiment of the present invention, where (a) is a side view and (b) is a longitudinal sectional view. It is a perspective view of a cover member of a writing instrument provided with a friction member by a 5th embodiment of the present invention. It is a side view of the cover member of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Corresponding components are denoted by common reference symbols throughout the drawings.

  Drawing 1 shows writing implement 1 provided with a friction member by a 1st embodiment of the present invention, (a) is a side view and (b) is a longitudinal section. The writing implement 1 is a so-called knock-type writing implement.

  The writing implement 1 includes a barrel 4 formed in a tubular shape and having a front shaft 2 and a rear shaft 3, a refill 5 which is a writing body disposed in the barrel 4 and having a writing portion 5 a at one end, and a refill 5. And a spring 6 for urging the rearward portion 5. At the rear end of the shaft cylinder 4, a known knock mechanism 10 including a cylindrical inner cylinder 8 having a clip 7 and an operation unit 9 is arranged. A friction member 11 is attached to the rear end of the operation unit 9 by fitting, bonding, or the like. The friction member 11 is covered by a cover member 12.

  In the present specification, in the axial direction of the writing instrument 1, the writing portion 5a side is defined as a "front" side, and the opposite side to the writing portion 5a is defined as a "rear" side. By pressing the operation unit 9 forward through the friction member 11, that is, by performing a knocking operation, the refill 5 moves in the front and rear direction in the barrel 4, and switches between the non-writing state and the writing state of the writing implement 1. be able to.

  FIG. 2 is a perspective view of a rear end portion of the writing instrument 1 of FIG. 1, and FIG. 3 is another perspective view of a rear end portion of the writing instrument of FIG. As shown in FIGS. 2 and 3, the friction member 11 is formed such that the cross-sectional shape of a portion exposed from the inner cylinder 8 in a state where the friction member 11 is attached to the operation unit 9 is substantially triangular. Specifically, in the cross section, the vertices of the triangle are formed in a circular arc shape, and the radius of curvature of the arc is larger on the rear end side of the friction member 11. The rear end surface 11a of the friction member 11 is formed in a curved shape. Therefore, the boundary between the rear end surface 11a and the peripheral surface 11b of the friction member 11 forms a ridgeline 11c.

  By using the rear end surface of the friction member 11, a wider area can be rubbed. Further, the friction member 11 can scrape a wider area by using the portion of the ridge line 11c corresponding to the side of the triangle, and can further improve the friction member 11 by using the portion of the ridge line 11c corresponding to the vertex of the triangle. A small area can be scraped. Needless to say, the cross-sectional shape is not limited to a triangle, but may be another polygon such as a quadrangle or a hexagon.

  At the rear end of the inner cylinder 8, a cylindrical fitting portion 8a that fits with the cover member 12 is formed. The fitting portion 8 a is substantially complementary to the outer shape of the friction member 11 so as not to hinder the knocking operation of the operation portion 9 via the friction member 11 and to receive the operation portion 9 and the friction member 11. Is formed. The cover member 12 protects the friction member 11 by closing the distal end, and covers the inner peripheral surface complementary to the outer peripheral surface of the fitting portion 8a so as to fit into the fitting portion 8a of the inner cylinder 8. Have. Fitting protrusions 8b are formed on the outer peripheral surface of the fitting portion 8a at equal intervals in the circumferential direction, and fitting recesses 12a are formed on the inner peripheral surface of the corresponding cover member 12. The cover member 12 is attached to the rear end of the inner cylinder 8 by fitting the fitting concave portion 12a and the fitting convex portion 8b.

  When the friction member 11 is not used and is not used, it is covered with the cover member 12, so that it is possible to prevent dirt and the like. Further, in this state, the operation unit 9 cannot be pressed forward via the friction member 11, so that an unintended knock operation is prevented. In other words, when performing the knocking operation, it is necessary to remove the cover member 12 from the inner cylinder 8.

  The refill 5 contains a thermochromic ink containing a thermochromic microcapsule pigment. Therefore, the writing implement 1 is a thermochromic writing implement. The thermochromic ink is a color that maintains a predetermined color (first color) at normal temperature (for example, 25 ° C.) and changes to another color (second color) when heated to a predetermined temperature (for example, 60 ° C.). Thereafter, when cooled to a predetermined temperature (for example, −5 ° C.), the ink has a property of returning to the original color (first color) again. In the writing implement 1 using the thermochromic ink, making the second color colorless and increasing the temperature of the drawn line written in the first color (for example, red) to make it colorless is referred to as "erasing" here. . Therefore, the writing member or the like on which the drawing line is written is rubbed by the friction member 11 to generate frictional heat, thereby changing the drawing line to colorless, that is, erasing. The second color may be a color other than colorless.

  To be more specific, the thermochromic microcapsule pigments are those that are discolored by heat such as frictional heat, for example, as long as they have a function of changing from colorless to colorless, from colorless to colored, and from colorless to colored. Instead, various types can be used, and examples thereof include microencapsulated thermochromic compositions containing at least a leuco dye, a color developer, and a color changing temperature regulator.

  The leuco dye that can be used is not particularly limited as long as it is an electron donating dye and functions as a color former. Specifically, triphenylmethane, spiropyran, fluoran, diphenylmethane, rhodamine lactam, indolyl phthalide, leuco auramine, and the like are conventionally known from the viewpoint of obtaining an ink having excellent coloring properties. They can be used alone (one type) or as a mixture of two or more types (hereinafter, simply referred to as “at least one type”).

  Specifically, 6- (dimethylamino) -3,3-bis [4- (dimethylamino) phenyl] -1 (3H) -isobenzofuranone, 3,3-bis (p-dimethylaminophenyl) -6 -Dimethylaminophthalide, 3- (4-diethylaminophenyl) -3- (1-ethyl-2-methylindol-3-yl) phthalide, 3- (4-diethylamino-2-ethoxyphenyl) -3- (1 -Ethyl-2-methylindol-3-yl) -4-azaphthalide, 1,3-dimethyl-6-diethylaminofluoran, 2-chloro-3-methyl-6-dimethylaminofluoran, 3-dibutylamino-6 -Methyl-7-anilinofluoran, 3-diethylamino-6-methyl-7-anilinofluoran, 3-diethylamino-6-methyl-7-xylidinofluor Orchid, 2- (2-chloroanilino) -6-dibutylaminofluoran, 3,6-dimethoxyfluoran, 3,6-di-n-butoxyfluoran, 1,2-benz-6-diethylaminofluoran, 1 , 2-benz-6-dibutylaminofluoran, 1,2-benz-6-ethylisoamylaminofluoran, 2-methyl-6- (Np-tolyl-N-ethylamino) fluoran, 2- (N -Phenyl-N-methylamino) -6- (Np-tolyl-N-ethylamino) fluoran, 2- (3'-trifluoromethylanilino) -6-diethylaminofluoran, 3-chloro-6 -Cyclohexylaminofluoran, 2-methyl-6-cyclohexylaminofluoran, 3-di (n-butyl) amino-6-methoxy-7-anilinofluoran 3,6-bis (diphenylamino) fluoran, methyl-3 ′, 6′-bisdiphenylaminofluoran, chloro-3 ′, 6′-bisdiphenylaminofluoran, 3-methoxy-4-dodecoxystyrino And quinoline, and at least one of these can be used.

  These leuco dyes have a lactone skeleton, a pyridine skeleton, a quinazoline skeleton, a bisquinazoline skeleton, and the like, and develop color by opening these skeletons (rings). Preferably, use of a leuco dye which changes from colored to colorless by heat is desirable.

  The color developer that can be used is a component having the ability to develop the color of the leuco dye, such as a phenol resin compound, a salicylic acid metal chloride, a salicylic acid resin metal salt compound, and a solid acid compound. Is mentioned.

  Specific examples of the developer that can be used include o-cresol, tertiary butyl catechol, nonylphenol, n-octylphenol, n-dodecylphenol, n-stearylphenol, p-chlorophenol, p-bromophenol, o-phenylphenol, hexafluorobisphenol, n-butyl p-hydroxybenzoate, n-octyl p-hydroxybenzoate, resorcinol, dodecyl gallate, 2,2-bis (4′-hydroxyphenyl) propane, 4,4 -Dihydroxydiphenylsulfone, 1,1-bis (4'-hydroxyphenyl) ethane, 2,2-bis (4'-hydroxy-3-methylphenyl) propane, bis (4-hydroxyphenyl) sulfide, 1-phenyl- 1,1-bis (4'-hydroxyf Nyl) ethane, 1,1-bis (4′-hydroxyphenyl) -3-methylbutane, 1,1-bis (4′-hydroxyphenyl) -2-methylpropane, 1,1-bis (4′-hydroxyphenyl) ) N-hexane, 1,1-bis (4′-hydroxyphenyl) n-heptane, 1,1-bis (4′-hydroxyphenyl) n-octane, 1,1-bis (4′-hydroxyphenyl) n -Nonane, 1,1-bis (4'-hydroxyphenyl) n-decane, 1,1-bis (4'-hydroxyphenyl) n-dodecane, 2,2-bis (4'-hydroxyphenyl) butane, , 2-bis (4'-hydroxyphenyl) ethyl propionate, 2,2-bis (4'-hydroxyphenyl) -4-methylpentane, 2,2-bis (4'-hydroxyphenyl) hexafluoro At least one of propane, 2,2-bis (4′-hydroxyphenyl) n-heptane, 2,2-bis (4′-hydroxyphenyl) n-nonane and the like can be mentioned.

  The amount of the developer used may be arbitrarily selected depending on the desired color density, and is not particularly limited, but is usually 0.1 to 1 part by mass of the leuco dye described above. It is preferable to select within a range of about 100 parts by mass.

  The discoloration temperature adjusting agent that can be used is a substance that controls the discoloration temperature in the coloration of the leuco dye and the developer.

  As the discoloration temperature adjusting agent that can be used, a conventionally known one can be used. Specific examples include alcohols, esters, ketones, ethers, acid amides, azomethines, fatty acids, and hydrocarbons.

For example, bis (4-hydroxyphenyl) phenyl methane dicaprylate (C ₇ H _15), bis (4-hydroxyphenyl) phenyl methane dilaurate (C ₁₁ H _23), bis (4-hydroxyphenyl) phenyl methane di myristate (C ₁₃ H _27), bis (4-hydroxyphenyl) phenyl ethane di myristate (C ₁₃ H _27), bis (4-hydroxyphenyl) phenyl methane dipalmitate (C ₁₅ H _30), bis (4-hydroxy At least one of phenyl) phenylmethane dibehenate (C ₂₁ H ₄₃ ) and bis (4-hydroxyphenyl) phenylethylhexylidene dimyristate (C ₁₃ H ₂₇ ) is exemplified.

  The friction member 11 is formed so as to be appropriately worn so as not to damage the paper surface and to prevent the printed characters from being blurred, as compared with the conventional friction member described in Patent Document 1. Specifically, in a wear test (ASTM D1044) specified in JIS K7204, under a load of 9.8 N and an environment of 1000 rpm, the Taber abrasion amount of the wear wheel CS-17 of the Taber abrasion tester is 10 mg or more. preferable. If the friction member has a Taber abrasion amount of less than 10 mg, the paper surface will be damaged at the time of rubbing, and the printed characters will be blurred.

  Examples of the material for forming the friction member 11 include rubbers such as thermosetting rubbers such as silicone rubber, nitrile rubber, ethylene propylene rubber, and ethylene propylene diene rubber; and thermoplastic elastomers such as styrene-based elastomers, olefin-based elastomers, and polyester-based elastomers. An elastic material, a mixture of two or more rubber elastic materials, and a mixture of a rubber elastic material and a synthetic resin are configured so that the Taber abrasion amount is 10 mg or more, and the friction member 11 is formed.

  Further, in order to adjust the amount of Taber abrasion to be 10 mg or more, a phthalic acid-based plasticizer may be added to the material of the friction member 11 to provide more flexibility. When the friction member 11 contains the phthalic acid-based plasticizer, the friction member 11 is more easily worn, so that the handwriting can be erased without damaging the paper surface and without blurring the printed characters and the like.

  Further, as a plasticizer to be added, in addition to phthalic acid, alkyl sulfonic acid phenyl ester, cyclohexanedicarboxylic acid ester, methacrylic acid ester, acrylate ester, acetyl citrate tributyl, adipic acid polyester, acetyl tributyl citrate, sebacin A non-phthalic acid plasticizer such as an acid diester or diethylene glycol dibenzoate may be used. Thereby, environmental hormones (endocrine disruptors) can be suppressed.

  Further, it is desirable that the friction member 11 has a durometer D hardness specified in JIS K6203 of 30 or more. Thereby, a predetermined hardness can be secured, and a more stable rubbing operation can be performed. In addition, the friction member 11 is applicable also as a touch pen and a stylus pen.

  Further, the friction member 11 is preferably colored with a color having a lower lightness value than the color of the thermochromic ink contained in the writing implement 1. That is, when the thermochromic ink of the writing instrument 1 is transferred to the surface of the friction member 11 without discoloration when the friction member 11 is used, the transfer of the thermochromic ink can be made inconspicuous. In particular, by setting the color of the friction member 11 to black, it is possible to make the surface stain accompanying the use of the friction member 11 less noticeable.

The lightness value is measured using a Munsell color system using a measuring device such as a general-purpose color difference meter (TC-8600A, manufactured by Tokyo Denshoku Co., Ltd.), the lightness value of the friction member is measured on the surface, and the thermochromic ink is measured. The lightness value was 4.5 m / min on a paper surface (former JIS P3201; high quality paper made from 100% chemical pulp as raw material, basis weight range 40 to 157 g / m ² , whiteness 75.0% or more). , Measured on a line drawn at a pitch interval of 0.1 mm.

  Hereinafter, various embodiments of the friction member having the above-described component configuration will be described.

  4A and 4B show a writing instrument 100 including a friction member 111 according to a second embodiment of the present invention, wherein FIG. 4A is a side view, and FIG. 4B is a longitudinal sectional view. The writing implement 100 is a so-called knock-type writing implement.

  The writing instrument 100 includes a barrel 104 formed in a tubular shape and having a front shaft 102 and a rear shaft 103, a refill 105 which is a writing body disposed in the barrel 104 and having a writing portion 105 a at one end, and a refill 105. And a spring 106 for urging the rearward of the spring 105. A known knock mechanism 110 including an operation unit 109 is arranged at the rear end of the barrel 104. By pressing the operation unit 109 forward, that is, by performing a knocking operation, the refill 105 moves in the front-back direction in the barrel 104 and can switch between the non-writing state and the writing state of the writing implement 100. That is, the knock mechanism 110 has a cylindrical rotating member 113 that rotates in the circumferential direction in response to the knocking operation, and that itself locks or unlocks with the rear shaft 103 while moving in the front-rear direction.

  In addition, a disc-shaped elastic member 114 is arranged inside the cylindrical shape of the rotating member 113. The elastic member 114 is locked inside the rotating member 113 by a step 113a formed by a difference in inner diameter. The refill 105 urged rearward by the spring 106 is inserted into the rotating member 113 and is in contact with the elastic member 114.

  The conventional knock-type writing instrument does not have a member corresponding to the elastic member 114 described above. Therefore, when the knocking operation is performed to shift from the writing state to the non-writing state, the urging force of the spring for urging the refill in the compressed state is released at a stretch, and the refill collides with the rotating member. Due to the impact, air bubbles are generated in the ink, which causes poor writing or the like.

  In this regard, since the writing instrument 100 has the elastic member 114, even if the urging force of the spring 106 is released at once, the collision of the refill 105 with the rotating member 113 is absorbed by the elastic deformation of the elastic member 114. Further, even when the writing instrument 100 is dropped by mistake, the impact due to the collision of the refill 105 with the rotating member 113 can be reduced. Therefore, according to the writing implement 100, there is an effect that a problem such as poor writing does not occur. Further, when the writing implement 100 is dropped, the impact can be reduced, so that the ball held at the tip of the writing portion of the ballpoint pen is prevented from coming off. The elastic member 114 may be formed integrally with the rotating member 113 by two-color molding or the like, instead of being formed separately.

  FIG. 5 is a perspective view of the front shaft 102 of the writing instrument 100 of FIG. In the present embodiment, a friction member 111 is provided at the rear end of the front shaft 102. That is, the front shaft 102 and the rear shaft 103 are attached by screwing the rear ends of the front shaft 102 inside the front end of the rear shaft 103. The peripheral surface of the rear end portion of the screw portion 102a of the front shaft 102 is formed in a flat cylindrical shape, and forms the friction member 111. Even when the front shaft 102 and the rear shaft 103 are attached by means other than screwing, for example, by press-fitting, the friction member 111 can be formed at the rear end of the front shaft 102. That is, the friction member 111 provided at the rear end of the front shaft 102 is covered with the front end of the rear shaft 103 as a cover member when not in use and not in use, so that dirt and the like can be prevented. In addition, by forming the rear shaft 103 from a transparent or translucent material, the wear state of the friction member 111 provided at the rear end of the front shaft 102 can be easily visually recognized.

  By making the transparent material or translucent material of the rear shaft 103 contain an ultraviolet absorber, it is possible to prevent the friction body from deteriorating due to ultraviolet rays. Examples of the ultraviolet absorbent include benzoate, benzophenone, salicylate, benzotriazole, cyanoacrylate, and hindered amine. From the viewpoint of enhancing transparency, particularly, a white benzoate-based product name “TINUVIN 770 DF” manufactured by Nichimaru Synthetic Resin Kogyo Co., Ltd. is preferable. Further, in addition to being formed by being contained in the material of the rear shaft 103, the ultraviolet absorber may be liquefied and applied to the surface of the rear shaft 103.

  Note that a friction member 111 may be formed at the front end of the rear shaft 103. The front end of the rear shaft 103 may be screwed together inside the rear end of the front shaft 102. In this case, a friction member 111 is formed at the rear end of the front shaft 102 or the front end of the rear shaft 103. You may.

  6A and 6B show a writing instrument 200 including a friction member 211 according to a third embodiment of the present invention, wherein FIG. 6A is a side view, and FIG. 6B is a longitudinal sectional view. FIG. 7 is another longitudinal sectional view of the writing instrument 200 of FIG. The writing implement 200 is a so-called double-type writing implement having a rotary feeding mechanism.

  The writing instrument 200 includes a shaft cylinder 204 formed in a cylindrical shape and having a front shaft 202 and a rear shaft 203, and a plurality of refills 205 that are writing bodies disposed in the shaft cylinder 204 and having a writing portion 205a at one end. And a plurality of springs 206 for urging the corresponding refill 205 rearward. Further, at the rear end of the shaft cylinder 204, a publicly-known rotary feeding mechanism 210 including a rotary unit 209 is arranged. By rotating the rotation unit 209 in the circumferential direction, that is, by performing a rotation feeding operation, the plurality of refills 205 sequentially move in the shaft cylinder 204 in the front-rear direction, and switch between the non-writing state and the writing state of the writing implement 200. be able to.

  A holding member 214 is attached to the rear end of the rotating unit 209. The holding member 214 is formed to receive and hold the friction member 211. A cover member 212 having a clip portion 212a is detachably fitted to the outer peripheral surface of the rear end portion of the rotating portion 209 while receiving the friction member 211 and the holding member 214. That is, the cover member 212 covers the friction member 211 in the attached state.

  The rotary feed-out mechanism 210 includes a cylindrical rotating part 209, a cylindrical cylindrical cam 213 connected to the rotating part 209, and a plurality of sliders 215 cooperating with the cylindrical cam 213. The rotating part 209 is attached to the rear end of the rear shaft 203 so as to be rotatable around the axis. A cam slope 213a is provided on the front end surface of the cylindrical cam 213. The cam slope 213a is configured to form one peak if the cylindrical cylindrical cam 213 is deployed in the circumferential direction. A rear end of the refill 205 is connected to a front end of the slider 215, and a spring 206 is connected to a rear end of the slider 215. That is, the refill 205 and the slider 215 are configured to be urged rearward and move only in the front-rear direction. Further, the slider 215 is pressed against the cam slope 213a of the cylindrical cam 213 by being urged rearward by the spring 206, so that the slider 215 is in contact with the slider 215.

  When the rotating unit 209 is rotated, the cylindrical cam 213 connected to the rotating unit 209 also rotates. By the rotation of the cylindrical cam 213, each of the sliders 215 contacting the cam slope 213a moves back and forth in turn. That is, the slider 215 relatively slides along the cam slope 213a. The writing portion of the refill 205 connected to the slider 215 that has reached the peak of the cam slope 213a protrudes from the barrel 204 and enters a writing state.

  One locking projection 209a is provided on the outer peripheral surface of the rotating portion 209. Further, a locking groove 212b is formed in the cover member 212 so as to receive the locking projection 209a of the rotating portion 209 without obstructing the attachment to the rotating portion 209. The rotary feeding type writing instrument 200 is configured such that it cannot be rotated unless the cover member 212 is attached in order to rotate the rotating section 209. In other words, the rear end of the rotating part 209 protrudes slightly backward from the rear end of the barrel 204, but it is difficult to grip the part and rotate the rotating part 209. On the other hand, as shown in FIG. 7, in a state where the cover member 212 is attached, when any part of the cover member 212 is gripped and rotated, the locking groove 212 b and the locking projection 209 a of the rotating portion 209 are moved. The rotation unit 209 can be rotated by locking.

  The number and shape of the locking projections 209a formed on the rotating part 209 can be arbitrarily set, and the number and shape of the locking grooves of the cover member 212 functioning as a gripping part are at least one. It can be set arbitrarily within a range in which it can be locked.

  The friction member 211 is formed in a columnar shape, and a rear end portion, that is, a front end portion is formed in a hemispherical shape so that handwriting is easily rubbed. The holding member 214 is formed in a cylindrical shape so as to receive the cylindrical portion of the friction member 211, and detachably holds the friction member 211. Therefore, the friction member 211 can be used in a state where it is attached to the rear end of the writing instrument 200, and can also be used in a state where it is detached from the writing instrument 200. When the friction member 211 is not in use and is not used, the friction member 211 is covered with the cover member 212, so that dirt and the like can be prevented.

  FIG. 8 shows a refill storage product 300 provided with a friction member 311 according to a fourth embodiment of the present invention, where (a) is a side view and (b) is a longitudinal sectional view.

  The refill storage product 300 includes a refill storage container 301 and one refill 305 stored in the refill storage container 301. Note that a plurality of refills 305 may be stored in the refill storage container 301. Further, it is preferable that the refill 305 can be used as the refill 205 in the third embodiment.

  The refill storage container 301 has a cylindrical container body (shaft tube) 304 and a substantially solid columnar cap 306 that opens and closes an opening 302 on the top side of the container body 304. A tail plug 308 is hermetically fitted in the opening 307 on the bottom side of the container body 304. The refill 305 is arranged in the refill storage container 301 such that the writing unit 305a is located toward the cap 306.

  In the present embodiment, the cap 306 can be used as the friction member 311. That is, the cap 306 is formed of the above-described material. Further, the container body 304 or the tail plug 308 may be formed as the friction member 311.

  Since the refill storage product 300 has the friction member 311, when the refill storage product 300 is carried around as a spare for the refill 305, the refill storage product itself can be used for rubbing a handwriting of a writing instrument. Even after the 305 is taken out for replacement, it can be used for scratching the handwriting of the writing instrument. Further, since the writing implement is separate from the writing implement, the writing implement can be conveniently used, such as holding the writing implement in the right hand, holding the friction member 311 of the refill storage product 300 in the left hand, and writing with the right hand and rubbing with the left hand.

  FIG. 9 is a perspective view of a cover member 412 of a writing instrument provided with the friction member 11 according to the fifth embodiment of the present invention, and FIG. 10 is a side view of the cover member 412 of FIG. The basic configuration other than the cover member 412 is the same as that of the writing instrument 1 according to the first embodiment, and thus the description is omitted. However, in the writing instrument according to the present embodiment, the shape of the rear end portion of the inner cylinder 8 into which the cover member 412 is fitted and the shape of the friction member are different. That is, the cross-sectional shapes of these members are circular so that the cover member 412 can be fitted.

  The cover member 412 has a truncated conical outer shape. The cover member 412 protects the friction member 11. A fitting recess 412a is formed on the inner peripheral surface of the cover member 412. The cover member 412 is attached to the rear end of the inner cylinder 8 by fitting the fitting recess 412a into the corresponding fitting projection 8b of the inner cylinder 8.

  The top surface 412b, which is the tip of the cover member 412, is formed in a gentle dome shape. A circular opening 412c is formed at the center of the top surface 412b. Around the circular opening 412c, three circular arc openings 412d are formed at equal intervals along the circumferential direction. Since the circular opening 412c and the arc opening 412d are formed in the top surface 412b of the cover member 412, even if a child or the like accidentally swallows the cover member 412, safety can be ensured without blocking the airway. Becomes

  On the conical side surface 412e of the cover member 412, three trapezoidal trapezoidal openings 412f are formed at regular intervals along the circumferential direction. More specifically, the conical side surface 412e is formed with a substantially uniform thickness, and each of the side surfaces 412e is cut out along a plane parallel to the central axis of the cover member 412, thereby forming a trapezoidal opening. 412f is formed. As a result of this formation, a flat surface 412g is formed on the side surface of the cover member 412 that does not penetrate inside, that is, a portion near the trapezoidal opening 412f, and a portion near each top surface 412b of the trapezoidal opening 412f. Is formed with a protruding portion 412h that protrudes radially outward.

  When the cover member 412 is removed when the friction member 11 is used, the finger can be hooked on the protrusion 412h without slipping, so that the cover member 412 can be easily removed. Also, when the cover member 412 is gripped when the cover member 412 is detached, the finger hits the flat surface 412g around the trapezoidal opening 412f, so that the skin can be gripped gently.

DESCRIPTION OF SYMBOLS 1 Writing implement 2 Front shaft 3 Rear shaft 4 Shaft cylinder 5 Refill 6 Spring 7 Clip 8 Inner cylinder 9 Operating part 10 Knock mechanism 11 Friction member 12 Cover member

Claims (1)

A friction member for erasing handwriting by thermochromic ink, comprising a friction member having a Taber abrasion amount of 10 mg or more in CS-17 by a Taber abrasion test specified in JIS K7204, and a front shaft and a rear shaft. A shaft cylinder,
The thermochromic writing implement, wherein the friction member is provided at a rear end of the front shaft and is disposed in a front end of the rear shaft.

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