JP6989627B2 - Thermal discoloration writing tool with friction member - Google Patents

Description

The present invention relates to a friction member and a heat-discolorable writing instrument provided with the friction member.

A writing instrument provided with a friction member and a friction member that discolors or decolorizes the handwriting by scratching with a heat-discolorable ink is known (for example, Patent Document 1). Patent Document 1 describes that the friction member is formed of a low-wear elastic material so that friction with a paper surface or the like causes almost no wear debris.

International Publication No. 2008/105227

However, since the friction member described in Patent Document 1 is formed of a low-wear material, the handwriting of the heat-discolorable ink written on the paper surface on which characters or the like printed like a book are pre-existing is scratched. At that time, not only the handwriting of the heat-discolorable ink is discolored or decolorized, but also the printed characters are blurred, and as a result, the paper surface may be soiled. Further, the friction member formed of the low-wear material may be damaged even on the paper surface if it is strongly rubbed.

The present invention provides a heat-discolorable writing tool provided with a friction member and a friction member which can easily discolor the handwriting of the heat-discolorable ink and do not damage the paper surface and blur the printed characters.

According to one aspect of the present invention, in the friction member for erasing handwriting due to heat-discoloring ink, the amount of taber wear in the taber wear test specified in JIS K7204 is 10 mg or more in CS-17. Friction members are provided. That is, according to this aspect, since the friction member is appropriately worn when the handwriting by the heat-discolorable ink is scraped, the handwriting can be erased without damaging the paper surface and blurring the printed characters.

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

Further, according to another aspect, a friction member characterized by containing a phthalic acid-based plasticizer is provided. 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.

Further, according to another aspect, a thermochromic writing tool provided with the friction member according to the above aspect is provided.

Further, according to another aspect, there is provided a thermochromic writing tool characterized in that the friction member is covered with a cover member formed transparently or translucently when not in use.

Further, the axle cylinder provided with the front shaft and the rear shaft is provided, and the friction member is provided at the rear end portion of the front shaft and is arranged in the front end portion of the rear shaft. Sex writing tools are provided.

Further, according to another aspect, the shaft cylinder, a plurality of cursives arranged in the shaft cylinder, a rotary feeding mechanism, and a cover member are provided, and the rotary feeding mechanism cooperates with the cover member. A thermochromic writing instrument is provided, which is characterized in that a plurality of the cursives can be drawn out in order.

Further, according to another aspect, the friction member has a triangular shape in the cross section exposed at the rear end, the apex of the triangle is formed in a round arc shape, and the radius of curvature of the arc is on the rear end side. A thermochromic writing instrument is provided, characterized in that it is larger.

According to the aspect of the present invention, it is common to provide a heat-discolorable writing tool provided with a friction member and a friction member which can easily discolor the handwriting of the heat-discolorable ink and do not damage the paper surface and blur the printed characters. It works.

A writing tool provided with a friction member according to the first embodiment of the present invention is shown, (a) is a side view, and (b) is a vertical sectional view. It is a perspective view of the rear end portion of the writing instrument of FIG. It is another perspective view of the rear end portion of the writing instrument of FIG. A writing tool provided with a friction member according to a second embodiment of the present invention is shown, (a) is a side view, and (b) is a vertical sectional view. It is a perspective view of the front axis of the writing instrument of FIG. A writing tool provided with a friction member according to a third embodiment of the present invention is shown, (a) is a side view, and (b) is a vertical sectional view. It is another vertical sectional view of the writing instrument of FIG. A refill storage container provided with a friction member according to a fourth embodiment of the present invention is shown, (a) is a side view, and (b) is a vertical sectional view. It is a perspective view of the cover member of the writing instrument provided with the friction member according to the 5th Embodiment of this 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. A common reference code is attached to the corresponding components throughout the drawing.

1A and 1B show a writing instrument 1 provided with a friction member according to the first embodiment of the present invention, where FIG. 1A is a side view and FIG. 1B is a vertical sectional view. The writing tool 1 is a so-called knock-type writing tool.

The writing tool 1 includes a shaft cylinder 4 formed in a cylindrical shape and having a front shaft 2 and a rear shaft 3, a refill 5 which is a cursive body arranged in the shaft cylinder 4 and having a writing portion 5a at one end, and a refill. It has a spring 6 that urges the 5 rearward. Further, a known knock mechanism 10 including a cylindrical inner cylinder 8 provided with a clip 7 and an operation portion 9 is arranged at the rear end portion of the shaft cylinder 4. A friction member 11 is attached to the rear end portion of the operation portion 9 by fitting, adhesion, or the like. The friction member 11 is covered with a cover member 12.

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

2 is a perspective view of the rear end portion of the writing instrument 1 of FIG. 1, and FIG. 3 is another perspective view of the rear end portion of the writing instrument 1 of FIG. As shown in FIGS. 2 and 3, the friction member 11 is formed so that the cross-sectional shape of the portion exposed from the inner cylinder 8 in the state of being attached to the operation portion 9 is substantially triangular. Specifically, in the cross section, the vertices of the triangle are formed in a round 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 surface. Therefore, the boundary between the rear end surface 11a and the peripheral surface 11b of the friction member 11 forms a ridge line 11c.

The friction member 11 can scrape a wider area by using the rear end surface. 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 by using the portion of the ridge line 11c corresponding to the apex of the triangle, more. A small area can be scraped. As a matter of course, the cross-sectional shape is not limited to a triangle, and may be another polygon such as a quadrangle or a hexagon.

At the rear end of the inner cylinder 8, a tubular fitting portion 8a that fits with the cover member 12 is formed. The fitting portion 8a 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 in. The cover member 12 protects the friction member 11 by closing the tip, and has an inner peripheral surface complementary to the outer peripheral surface of the fitting portion 8a so as to be fitted to the fitting portion 8a of the inner cylinder 8. Have. Fitting convex portions 8b arranged at equal intervals in the circumferential direction are formed on the outer peripheral surface of the fitting portion 8a, and fitting concave portions 12a are formed on the inner peripheral surface of the corresponding cover member 12. The cover member 12 is attached to the rear end portion 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 in use, it is covered by the cover member 12, so that dirt and the like can be prevented. Further, in this state, since the operation unit 9 cannot be pressed forward via the friction member 11, it is possible to prevent an unintentional knock operation. In other words, when performing the knock operation, it is necessary to remove the cover member 12 from the inner cylinder 8.

The refill 5 contains a heat-changing ink containing a heat-changing microcapsule pigment. Therefore, the writing tool 1 is a thermochromic writing tool. The thermochromic ink maintains a predetermined color (first color) at room temperature (for example, 25 ° C.), and changes to another color (second color) when the temperature is raised to a predetermined temperature (for example, 60 ° C.). After that, when cooled to a predetermined temperature (for example, −5 ° C.), it refers to an ink having a property of returning to the original color (first color) again. In the writing instrument 1 using the heat-changing ink, the second color is made colorless, and the temperature of the drawn line written in the first color (for example, red) is raised to make it colorless, which is referred to as "erasing" here. .. Therefore, the friction member 11 rubs against the writing surface or the like on which the drawn lines are written to generate frictional heat, thereby changing the drawn lines to colorless, that is, erasing them. As a matter of course, the second color may be colored other than colorless.

More specifically, the thermochromic microcapsule pigment is particularly limited as long as it has a function of changing color due to heat such as frictional heat, for example, from colored to colorless, from colored to colored, and from colorless to colored. However, various substances can be used, and examples thereof include microencapsulated heat-discoloring compositions containing at least a leuco dye, a color-developing agent, and a discoloration temperature-adjusting agent.

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, conventionally known inks such as triphenylmethane, spiropyran, fluorane, diphenylmethane, rhodamine lactam, indrillphthalide, and leucooramine are available from the viewpoint of obtaining ink having excellent color development characteristics. It can be used alone (1 type) or in combination of 2 or more (hereinafter, simply referred to as "at least 1 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-methylindole-3-yl) phthalide, 3- (4-diethylamino-2-ethoxyphenyl) -3- (1) -Ethyl-2-methylindole-3-yl) -4-azaphthalide, 1,3-dimethyl-6-diethylaminofluorane, 2-chloro-3-methyl-6-dimethylaminofluorane, 3-dibutylamino-6 -Methyl-7-anilinofluorane, 3-diethylamino-6-methyl-7-anilinofluorane, 3-diethylamino-6-methyl-7-xylidinofluorane, 2- (2-chloroanilino) -6- Dibutylaminofluorane, 3,6-dimethoxyfluorine, 3,6-di-n-butoxyfluolane, 1,2-benz-6-diethylaminofluorane, 1,2-benz-6-dibutylaminofluorane, 1,2-Benz-6-ethylisoamylaminofluorane, 2-methyl-6- (N-p-tolyl-N-ethylamino) fluorane, 2- (N-phenyl-N-methylamino) -6- (N-p-tolyl-N-ethylamino) fluorane, 2- (3'-trifluoromethylanilino) -6-diethylaminofluorane, 3-chloro-6-cyclohexylaminofluorane, 2-methyl-6- Cyclohexylaminofluorane, 3-di (n-butyl) amino-6-methoxy-7-anilinofluorane, 3,6-bis (diphenylamino) fluorane, methyl-3', 6'-bisdiphenylaminofluorane , Chloro-3', 6'-bisdiphenylaminofluorane, 3-methoxy-4-dodecoxystylinoquinolin, and the like, 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 when these skeletons (rings) are opened. Preferably, it is desirable to use a leuco dye that changes from colored to colorless by heat.

The color developer that can be used is a component having an ability to develop the color of the leuco dye, and is, for example, a phenol resin compound, a salicylic acid metal chloride, a salicylic acid resin metal salt compound, a solid acid compound, or the like. Can be mentioned.

Specific examples of the color developer that can be used include o-cresol, tertiary butylcatechol, nonylphenol, n-octylphenol, n-dodecylphenol, n-stearylphenol, p-chlorophenol, and p-bromophenol. o-phenylphenol, hexafluorobisphenol, n-butyl p-hydroxybenzoate, n-octyl p-hydroxybenzoate, resorcin, 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'-hydroxyphenyl) 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, 2,2-bis (4'-hydroxyphenyl) ethyl propionate, 2,2-bis (4'-hydroxyphenyl) -4-methylpentane, 2,2-bis ( At least one such as 4'-hydroxyphenyl) hexafluoropropane, 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 to be used may be arbitrarily selected according to the desired color density, and is not particularly limited, but is usually 0.1 to 1 parts by mass with respect to 1 part by mass of the leuco dye described above. It is preferable to select within the range of about 100 parts by mass.

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

As the discoloration temperature adjusting agent that can be used, conventionally known ones can be used. Specific examples thereof include alcohols, esters, ketones, ethers, acid amides, azomethins, fatty acids, hydrocarbons and the like.

For example, bis (4-hydroxyphenyl) phenylmethane dicaprylate (C ₇ H ₁₅ ), bis (4-hydroxyphenyl) phenyl methane dilaurate (C ₁₁ H ₂₃ ), bis (4-hydroxy phenyl) phenyl methane dimyristate. (C ₁₃ H ₂₇ ), Bis (4-Hydroxyphenyl) Phenyl ethanedimilistate (C ₁₃ H ₂₇ ), Bis (4-Hydroxyphenyl) Phenylmethane dipalmitate (C ₁₅ H ₃₀ ), Bis (4-Hydroxy) At least one of phenyl) phenylmethane dibehenate (C ₂₁ H ₄₃ ), bis (4-hydroxyphenyl) phenylethyl hexylidene dimyristate (C ₁₃ H ₂₇ ) and the like can be mentioned.

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

As a material for forming the friction member 11, rubbers such as heat-curable 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. A mixture of two or more kinds of elastic materials and two or more kinds of rubber elastic materials and a mixture of rubber elastic materials and synthetic resin are configured so that the amount of taber wear is 10 mg or more, and the friction member 11 is formed.

Further, in order to adjust the amount of tabor wear 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. Since the friction member 11 contains a phthalic acid-based plasticizer, the friction member 11 is more likely to be worn, so that the handwriting can be erased without damaging the paper surface and blurring the printed characters and the like.

In addition to phthalic acid-based plastics, alkylsulphonic acid phenyl ester, cyclohexanedicarboxylic acid ester, methacrylic acid ester, acrylic acid ester, tributyl acetylcitrate, adipic acid-based polyester, tributyl acetylcitrate, and sebacine are added as plasticizing agents. A non-phthalic acid-based plasticizing agent 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 of 30 or more specified in JIS K6203. As a result, a predetermined hardness can be secured, and a more stable scraping operation becomes possible. The friction member 11 can also be applied as a touch pen or a stylus pen.

Further, it is preferable that the friction member 11 is colored with a color having a brightness value lower than that of the heat-discolorable ink contained in the writing instrument 1. That is, when the heat-discoloring ink of the writing instrument 1 is transferred to the surface of the friction member 11 without being discolored when the friction member 11 is used, the transfer of the heat-discoloring ink can be made inconspicuous. In particular, by making the color of the friction member 11 black, it is possible to make the surface stains due to the use of the friction member 11 inconspicuous.

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

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

4A and 4B show a writing tool 100 provided with a friction member 111 according to a second embodiment of the present invention, where FIG. 4A is a side view and FIG. 4B is a vertical sectional view. The writing tool 100 is a so-called knock-type writing tool.

The writing tool 100 includes a shaft cylinder 104 formed in a cylindrical shape and having a front shaft 102 and a rear shaft 103, a refill 105 which is a cursive body arranged in the shaft cylinder 104 and having a writing portion 105a at one end, and a refill. It has a spring 106 that urges the 105 rearward. Further, a known knock mechanism 110 including an operation unit 109 is arranged at the rear end portion of the axle cylinder 104. By pressing the operation unit 109 forward, that is, by performing a knock operation, the refill 105 moves in the front-rear direction in the barrel 104, and the non-writing state and the writing state of the writing instrument 100 can be switched. That is, the knock mechanism 110 has a cylindrical rotating member 113 that rotates in the circumferential direction in response to the knock operation and locks or unlocks the rear shaft 103 while moving in the front-rear direction.

Further, a disk-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 inside the rotating member 113 and is in contact with the elastic member 114.

The conventional knock-type writing tool does not have a member corresponding to the elastic member 114 described above. Therefore, when the knock operation is performed to shift from the writing state to the non-writing state, the urging force of the spring that urges the refill in the compressed state is released at once, and the refill collides with the rotating member. The impact causes bubbles to be generated in the ink, which causes writing defects and the like.

In this respect, since the writing tool 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 if the writing tool 100 is accidentally dropped, the impact due to the collision of the refill 105 with the rotating member 113 can be reduced. Therefore, according to the writing instrument 100, there is an effect that problems such as writing defects do not occur. Further, when the writing instrument 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 integrally formed with the rotating member 113 by two-color molding or the like, instead of being a separate body.

FIG. 5 is a perspective view of the front shaft 102 of the writing tool 100 of FIG. In the present embodiment, the friction member 111 is provided at the rear end portion of the front shaft 102. That is, the front shaft 102 and the rear shaft 103 are attached by screwing the rear end portions of the front shaft 102 to each other in the front end portion of the rear shaft 103. The peripheral surface of the rear end portion of the threaded portion 102a of the front shaft 102 is formed in a flat cylindrical shape to form the friction member 111. Even when the front shaft 102 and the rear shaft 103 are attached by press fitting other than screwing, the friction member 111 can be formed at the rear end portion of the front shaft 102. That is, the friction member 111 provided at the rear end portion of the front shaft 102 is covered by the front end portion of the rear shaft 103 as a cover member when not in use, so that dirt and the like can be prevented. Further, by forming the rear shaft 103 with a transparent or translucent material, it is possible to easily visually recognize the wear state of the friction member 111 provided at the rear end portion of the front shaft 102.

By containing the ultraviolet absorber in the transparent material or the translucent material of the rear shaft 103, deterioration of the friction body due to ultraviolet rays can be prevented. Examples of the ultraviolet absorber include benzoate-based, benzophenone-based, salicylate-based, benzotriazole-based, cyanoacrylate-based, and hindered amine-based. From the viewpoint of enhancing transparency, the trade name "TINUVIN770 DF" manufactured by Hinomaru Synthetic Resin Industry Co., Ltd., which is a white benzoate type, is particularly preferable. In addition to being contained in the material of the rear shaft 103 and molded, the ultraviolet absorber may be liquefied and applied to the surface of the rear shaft 103.

The friction member 111 may be formed at the front end portion of the rear shaft 103. The front end portions of the rear shaft 103 may be screwed together in the rear end portion of the front shaft 102, and even in this case, the friction member 111 is formed on the rear end portion of the front shaft 102 or the front end portion of the rear shaft 103. You may.

6A and 6B show a writing tool 200 provided with a friction member 211 according to a third embodiment of the present invention, where FIG. 6A is a side view and FIG. 6B is a vertical sectional view. Further, FIG. 7 is another vertical sectional view of the writing tool 200 of FIG. The writing tool 200 is a so-called compound writing tool having a rotary feeding mechanism.

The writing tool 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 which are cursive bodies arranged in the shaft cylinder 204 and having a writing portion 205a at one end. It has a plurality of springs 206 that urge the corresponding refill 205 rearward. Further, a known rotary feeding mechanism 210 including a rotating portion 209 is arranged at the rear end portion of the axle cylinder 204. By rotating the rotating portion 209 in the circumferential direction, that is, by performing a rotary feeding operation, a plurality of refills 205 move in order in the barrel 204 in the front-rear direction, and the writing instrument 200 is switched between the non-writing state and the writing state. be able to.

A holding member 214 is attached to the rear end portion of the rotating portion 209. The holding member 214 is formed so as to receive and hold the friction member 211. Further, a cover member 212 provided with 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 feeding mechanism 210 has a tubular rotating portion 209, a tubular cylindrical cam 213 connected to the rotating portion 209, and a plurality of sliders 215 that cooperate with the cylindrical cam 213. The rotating portion 209 is rotatably attached around the axis with respect to the rear end portion of the rear shaft 203. 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 mountain when the cylindrical cylindrical cam 213 is deployed in the circumferential direction. The rear end of the refill 205 is connected to the front end of the slider 215, and the spring 206 is connected to the rear end of the slider 215. That is, the refill 205 and the slider 215 are urged rearward and are configured to be movable only in the front-rear direction. Further, the slider 215 is in contact with the cam slope 213a of the cylindrical cam 213 by being constantly pressed against the cam slope 213a by being urged backward by the spring 206.

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

One locking projection 209a is provided on the outer peripheral surface of the rotating portion 209. Further, the cover member 212 is formed with a locking groove 212b so as not to hinder the attachment to the rotating portion 209 and to receive the locking projection 209a of the rotating portion 209. The rotary feeding type writing tool 200 is configured so that the rotating portion 209 cannot be rotated unless the cover member 212 is attached in order to rotate the rotating portion 209. That is, the rear end portion of the rotating portion 209 protrudes slightly rearward from the rear end portion of the barrel 204, but it is difficult to grip the portion and rotate the rotating portion 209. On the other hand, as shown in FIG. 7, when the cover member 212 is attached, when any part of the cover member 212 is gripped and rotated, the locking groove 212b and the locking projection 209a of the rotating portion 209 are formed. It can be locked and the rotating portion 209 can be rotated.

The number and shape of the locking projections 209a formed on the rotating portion 209 can be arbitrarily set, and the number and shape of the locking grooves of the cover member 212 functioning as the gripping portion are also set to at least one locking projection 209a. It can be set arbitrarily within the range that can be locked with.

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

8A and 8B show a refill storage product 300 provided with a friction member 311 according to a fourth embodiment of the present invention, where FIG. 8A is a side view and FIG. 8B is a vertical sectional view.

The refill storage product 300 is composed of a refill storage container 301 and one refill 305 stored in the refill storage container 301. 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 cylinder) 304 and a substantially solid columnar cap 306 that opens and closes an opening 302 on the top side of the container body 304. The tail plug 308 is tightly 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 so that the writing portion 305a is located toward the cap 306.

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

Since the refill storage item 300 has the friction member 311, when the refill storage item 300 is carried around as a spare for the refill 305, the refill storage item itself can be used for rubbing the handwriting of the writing tool, and the refill in the refill storage item 300 can be used. Even after removing the 305 for replacement, it can be used for scraping the handwriting of writing tools. Further, since it is a separate body from the writing instrument, it can be conveniently used such that the writing instrument is held in the right hand and the friction member 311 of the refill storage item 300 is held in the left hand, the writing is performed by the right hand, and the scraping is performed by the left hand.

9 is a perspective view of the cover member 412 of the 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. Since the basic configuration other than the cover member 412 is the same as that of the writing tool 1 according to the first embodiment, the description thereof will be omitted. However, the writing tool according to the present embodiment differs in 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. That is, the cross-sectional shape of these members is formed in a circular shape so that the cover member 412 can be fitted.

The cover member 412 has a truncated cone-shaped 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 portion of the inner cylinder 8 by fitting the fitting recess 412a into the fitting convex portion 8b of the corresponding 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 in the central portion of the top surface 412b. Around the circular opening 412c, three arc-shaped arc openings 412d are formed at equal intervals along the circumferential direction. By forming the circular opening 412c and the arc opening 412d on the top surface 412b of the cover member 412, it is possible to ensure safety without obstructing the airway even if an infant or the like accidentally swallows the cover member 412. Will be.

On the conical side surface 412e of the cover member 412, three trapezoidal trapezoidal openings 412f are formed at equal intervals along the circumferential direction. Specifically, the conical side surface 412e is formed with a substantially uniform wall thickness, and the trapezoidal opening is formed by cutting each of the side surface 412e with a plane parallel to the central axis of the cover member 412. 412f is formed. As a result of this formation, a flat flat surface 412 g is formed on the side surface of the cover member 412 that does not penetrate inside, that is, the portion near the trapezoidal opening 412f, and the portion near the top surface 412b of each trapezoidal opening 412f. Is formed with a protruding portion 412h projecting outward in the radial direction.

When removing the cover member 412 when the friction member 11 is used or the like, the cover member 412 can be easily removed because the finger can be hooked on the protruding portion 412h without slipping. Further, when the cover member 412 is gripped when the cover member 412 is removed, the finger touches the flat surface 412 g around the trapezoidal opening 412f, so that the cover member 412 can be gently gripped on the skin.

1 Writing tool 2 Front axis 3 Rear axis 4 Axle cylinder 5 Refill 6 Spring 7 Clip 8 Inner cylinder 9 Operation part 10 Knock mechanism 11 Friction member 12 Cover member

Claims (1)

A heat-discoloring writing instrument provided with a friction member for erasing handwriting caused by heat-discoloring ink.
The friction member has a triangular shape in a cross section exposed at the rear end of the thermochromic writing tool, the apex of the triangle is formed in a round arc shape, and the radius of curvature of the arc formed at the apex of the triangle is the said. The rear end side of the friction member is larger ,
It said friction member comprises a phthalate plasticizer, thermochromic writing instrument Taber abrasion amount by Taber abrasion test specified in JIS K7204 is characterized der Rukoto than 10mg in CS-17.

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