JP6811620B2 - Thermal discoloration writing tool - Google Patents

Description

The present invention relates to a thermochromic writing instrument capable of discoloring handwriting by frictional heat.

Conventionally, various writing instruments using thermochromic ink capable of discoloring the written handwriting have been proposed. In particular, a reversible thermochromic composition comprising an electron-donating color-developing organic compound, an electron-accepting compound as a color developer, and a reaction medium serving as a color-changing temperature adjusting agent for determining the occurrence temperature of the color-developing reaction of both is included. A technique is disclosed in which a writing tool containing a reversible thermochromic microcapsule pigment, a thermochromic ink containing at least water, and the thermochromic ink has a friction portion capable of discoloring a brush stroke by frictional heat. (Patent Document 1).

In the thermochromic writing instrument according to Patent Document 1, a cursive containing the thermochromic ink, which is a thermochromic ink, is built in the barrel, and a writing portion of the cursive is provided by an operation unit provided on the rear side of the barrel. Protrudes forward from the front end of the barrel or pulls into the barrel. Further, a friction portion capable of discoloring the heat-discoloring ink by friction is provided at a position different from the operation portion.

International Publication No. 2008/105227

However, in the writing instrument according to Patent Document 1, since the operation portion and the friction portion are arranged at different positions, the feeding operation and the discoloring operation of the cursive are different, so that the location of the friction portion is difficult to understand. Further, since the operation unit is located at the rear part of the barrel, the operation of switching between the writing state and the non-writing state is large when the gripping position of the barrel is changed, which is difficult for quick switching operation.

Therefore, an object of the present invention is to provide a writing instrument capable of easily grasping the position of the friction portion and easily and surely switching between a writing state and a non-writing state.

According to one aspect of the present invention, it is a thermochromic writing instrument capable of discoloring handwriting, and is a writing instrument movably arranged in a shaft cylinder and the shaft cylinder, and at least one of which contains a heat discoloring ink. A pressing member which is an operation portion provided on the side surface of the barrel and a friction portion capable of discoloring the handwriting of the heat-discoloring ink are provided, and the friction portion is formed on the outer surface of the pressing member. Provided is a thermochromic writing instrument characterized in that the pressing member is provided at a portion in the middle of the axially total length of the barrel. The intermediate portion mentioned here is in the range of 35% to 65% with respect to the total length in the axial direction of the writing instrument, and corresponds to the vicinity of the position of the center of gravity of the writing instrument.

According to another aspect, each of the cursive, a plurality of cursives movably arranged in the cursive, a plurality of pressing members provided on the side surface of the cursive, and the cursive. A plurality of engaging portions that engage with the cursive in the axial direction to restrict the movement of the cursive, and a first elastic member arranged in the vicinity of the central axis of the barrel corresponding to the pressing member. When the pressing member is pressed in the radial direction, the engaging portion is disengaged, the corresponding cursive can be moved by gravity, and the first elastic member has a diameter. When compressed in the direction and the pressure is released, the engaging portion engages with the cursive by the restoring force of the first elastic member, and further includes a plurality of engaging members formed in a tubular shape. An engaging portion is provided on the inner surface of the engaging member, the first elastic member is spherical, and further includes a second elastic member that assists the return of the pressing member by releasing the pressing. Provided is a thermochromic writing tool characterized by being a dome-shaped spring made of a thin plate.

According to the aspect of the present invention, by forming the friction portion on the outer surface of the operation portion, the operation portion and the friction portion are provided at the same location and in the middle portion in the axial direction of the barrel, that is, near the so-called center of gravity position. It has a common effect that it is easy to recognize the location of a part and that one cursive selected from a plurality of cursives can be easily and surely switched between a writing state and a non-writing state.

It is a side view of the writing state of the thermochromic writing instrument according to the embodiment of this invention. It is a perspective view which omitted the rear shaft in the thermochromic writing tool of FIG. It is a vertical cross-sectional view of the writing state of the thermochromic writing instrument of FIG. It is a vertical sectional view of the thermochromic writing instrument of FIG. 1 in a non-writing state. It is an enlarged vertical sectional view of the thermochromic writing instrument of FIG. It is sectional drawing in line XX of FIG. It is a vertical sectional view of a rear axle. It is a perspective view of a switch. It is a vertical sectional view of a switch. It is a perspective view of the positioning member. It is a rear view of the positioning member. It is a perspective view of the engaging member. It is a vertical sectional view of the engaging member. It is a perspective view of the spring holding member. It is a vertical sectional view of a spring holding member. It is a vertical sectional view of a weight member. It is a side view of the engaging rod. It is an enlarged vertical sectional view explaining the switching between the non-writing state and the writing state of the thermochromic writing instrument 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 drawings.

FIG. 1 is a side view of the writing state of the thermochromic writing instrument according to the embodiment of the present invention, FIG. 2 is a perspective view of the thermochromic writing instrument of FIG. 1 with the rear axis omitted, and FIG. It is a vertical cross-sectional view of the writing state of the thermochromic writing instrument of FIG. 1, and FIG. 4 is a vertical cross-sectional view of the non-writing state of the thermochromic writing instrument of FIG.

The thermochromic writing tool 1 has a barrel 2 and a clip member 3. The axle cylinder 2 has a cylindrical front shaft 4 and a cylindrical rear shaft 5 whose front end is press-fitted into the rear end of the front shaft 4. A plurality of cursive bodies 6 are housed in the barrel 2 so as to be movable back and forth, that is, reciprocating. In this embodiment, three cursive bodies 6 are accommodated. A hole is formed at the tip of the front shaft 4, and the writing portion 6a at the tip of the selected cursive 6 can appear and disappear. That is, the thermochromic writing instrument 1 has a writing state in which one of the writing portions 6a protrudes from the tip of the barrel 2 (FIG. 3) and a non-writing state in which all the writing portions 6a are immersed in the barrel 2 (FIG. 3). 4) and can be switched. In the present specification, in the axial direction of the thermochromic writing instrument 1, the writing portion 6a side is defined as the "front" side, and the side opposite to the writing portion 6a is defined as the "rear" side.

The cursive body 6 is filled with heat-discoloring ink, and the writing unit 6a is equipped with a ballpoint pen tip holding a writing ball and a marking pen core made of a porous material. In the present embodiment, three cursive bodies 6 are accommodated, but in the case of a ballpoint pen tip, each writing portion 6a is preferably formed with a different ball diameter, and in the case of a marking pen, it is preferably formed with a different thickness. 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, 65 ° C.). After that, when cooled to a predetermined temperature (for example, −10 ° C.), the ink has a property of returning to the original color (first color). Generally, the second color may be colorless, and the drawn line written in the first color (for example, red) may be heated to make it colorless. Therefore, the friction body 9 rubs against the paper surface on which the drawn lines are written to generate frictional heat, thereby changing the drawn lines to colorless. As a matter of course, the second color may be a color other than colorless. More specifically, examples of the heat-discoloring microcapsule pigment used as a coloring material for the heat-discoloring ink include microencapsulations of a heat-discoloring composition containing at least a leuco dye, a color developer, and a discoloration temperature adjuster. Be done. The reversible thermochromic microcapsule pigment preferably has an average particle size in the range of 0.1 to 5.0 μm, preferably 0.5 to 2 μm. The reversible thermochromic microcapsule pigment is preferably blended in an amount of 4 to 30% by weight based on the total amount of the ink composition. The average particle size was measured using a particle size measuring device N4Plus (manufactured by COOLTER). At the time of measurement, the sample was diluted with water until the recommended concentration of N4Plus was reached, and the measurement was performed under a temperature condition of 25 ° C.

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, spiropirane, fluorane, diphenylmethane, rhodamine lactam, indrillphthalide, and leucochloridium 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 types (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-methylindol-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-dimethoxyfluorane, 3,6-di-n-butoxyfluorane, 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 development 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 the 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. Specifically, o-cresol, tertiary butyl catechol, nonylphenol, n-octylphenol, n-dodecylphenol, n-stearylphenol, p-chlorophenol, p-bromophenol, o-phenylphenol, hexafluorobisphenol, p. N-butyl-hydroxybenzoate, n-octyl p-hydroxybenzoate, resorcin, dodecyl phosphite, 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'-hydroxy) Phenyl) 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 -Nonan, 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) ethylpropionate, 2,2-Bis (4'-Hydroxyphenyl) -4-methylpentane, 2,2-Bis (4'-Hydroxyphenyl) hexafluoropropane, At least one of 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. It is preferable to select within the range of about 100 parts by mass.

The color change temperature adjusting agent is a substance that controls the color change temperature in the coloration of the leuco dye and the color developer, and conventionally known substances can be used. For example, alcohols, esters, ketones, ethers, acid amides, azomethines, fatty acids, hydrocarbons and the like can be mentioned. Specifically, bis (4-hydroxyphenyl) phenylmethane dicaprilate (C7H15), bis (4-hydroxyphenyl) phenylmethane dilaurate (C11H23), bis (4-hydroxyphenyl) phenylmethane dimyristate (C13H27) , Bis (4-hydroxyphenyl) phenylethanedimilistate (C13H27), bis (4-hydroxyphenyl) phenylmethanedipalmitate (C15H30), bis (4-hydroxyphenyl) phenylmethanedibehenate (C21H43), bis At least one such as (4-hydroxyphenyl) phenylethylhexylidene dimillistate (C13H27) can be mentioned.

FIG. 5 is an enlarged vertical sectional view of the thermochromic writing tool 1 of FIG. 1, and FIG. 6 is a sectional view taken along line XX of FIG. The heat-discoloring writing tool 1 includes a switch 10, a positioning member 20, an engaging member 30, a spring holding member 40, a weight member 50, and a switch 10, which is a pressing member located in the middle portion of the heat-discoloring writing tool 1 in the axial direction. It has an engaging spring 60, a first elastic member 70, a second elastic member 80, and a friction portion 90 capable of discoloring heat-discoloring ink on the outer peripheral surface of the switch 10. Hereinafter, each configuration will be described in detail with reference to FIGS. 5 and 6 and the corresponding drawings.

FIG. 7 is a vertical cross-sectional view of the rear axle 5. In FIG. 7, the left side is the front side of the thermochromic writing tool 1, and the right side is the rear side of the thermochromic writing tool 1. On the side surface of the rear shaft 5, three substantially elliptical mounting holes 5a for receiving the three switches 10 are formed corresponding to the number of cursive bodies 6. On the inner surface of the rear shaft 5 behind the mounting hole 5a, a partition wall 5b is provided in an annular shape along the circumferential direction. The through hole 5c is defined by the partition wall 5b. Two protrusion-shaped rotation stoppers 5d are formed facing each other on the front end surface of the partition wall 5b. Three weight members 50 are arranged inside the rear shaft 5 behind the partition wall 5b. On the inner surface of the rear shaft 5 behind the partition wall 5b, three guide walls 5e extending in the axial direction are formed in order to separate the weight members 50 in the circumferential direction and guide them along the axial direction. There is.

FIG. 8 is a perspective view of the switch 10, and FIG. 9 is a vertical sectional view of the switch 10. The thermochromic writing instrument 1 has the same number of switches 10 as the number of cursive bodies 6. In this embodiment, three switches 10 are evenly arranged in the radial direction. The switch 10 is formed into a substantially elliptical columnar shape, a pressing surface 12 located on the upper surface of the switch body 11 and pressed by the user, and a columnar shape located on the lower surface of the switch body 11. It has a first protrusion 13 and a second protrusion 14. At the time of assembly, the first protrusion 13 is arranged on the front side of the thermochromic writing tool 1, and the second protrusion 14 is arranged on the rear side of the thermochromic writing tool 1. A recess 15 is formed on the lower surface of the switch body 11 between the first protrusion 13 and the second protrusion 14. The switch body 11 is integrally formed of a relatively hard resin material such as polycarbonate resin. The outer surface of the pressing surface 12 of the switch body 11 is provided with a friction portion 90 capable of discoloring the heat-discoloring ink by frictional heat generated by the friction operation. The friction portion 90 is a mixture of two or more types of rubber elastic materials such as silicone rubber, nitrile rubber, ethylene propylene rubber, ethylene propylene diene rubber, styrene elastomer, olefin elastomer, and thermoplastic elastomer such as polyester elastomer. , And a rubber elastic material composed of a mixture of a rubber elastic material and a synthetic resin. In particular, by containing a basic magnesium carbonate porous body, not only the handwriting of a heat-discoloring writing instrument is discolored, but also the handwriting of an erasable writing instrument other than a heat-discoloring ink equipped with a mechanical pencil or the like is erased by friction. It is possible and preferable. The low wear property mentioned here means that the amount of taper wear in the JIS K7204 test method H22 is less than 15 mg, so that the wear is small even in the friction operation, and the deformation of the friction portion 90 due to the friction operation can be prevented. The switch body 11 and the friction portion 90 are integrally fixed by adhesion, welding, fitting, two-color molding, or the like, but they may be formed as one component from the same material. The friction portion 90 includes a contact surface 91 that comes into contact with the pressing surface 12, and a contact portion 92 that a finger or the like touches when the switch 10 is pressed. The shape of the contact portion 92 varies depending on the ink color of the writing body 6, the ink discoloration temperature, the type of the writing body 6, and the like, and the writing body 6 can be easily made by the feeling of contact with the contact portion 92 without visually recognizing it. It is preferable to make it identifiable.

FIG. 10 is a perspective view of the positioning member 20, and FIG. 11 is a rear view of the positioning member 20. The positioning member 20 is a cylindrical member having both end faces parallel to each other. The outer diameter of the positioning member 20 is set to be slightly smaller than the outer diameter of the rear shaft 5. The positioning member 20 is formed with three notched portions 21 which are notched in a rectangular shape from the rear end surface toward the front, corresponding to the number of cursive bodies 6. The portion remaining without being cut out forms three corner portions (horn portions) 22 protruding rearward. In other words, the notch portion 21 is defined by the three corner portions 22. The end faces 21a of the notches 21 facing each other in the circumferential direction are parallel to each other.

FIG. 12 is a perspective view of the engaging member 30, and FIG. 13 is a vertical sectional view of the engaging member 30. The thermochromic writing instrument 1 has three engaging members 30 corresponding to the number of cursive bodies 6. The engaging member 30 is arranged in the shaft cylinder 2 so that the left side is the front side of the heat-discoloring writing tool 1 and the right side is the rear side of the heat-discoloring writing tool 1 in FIG. Specifically, the three engaging members 30 are arranged in the three notches 21 of the positioning member 20, respectively. Therefore, the total length of the engaging member 30 is set slightly shorter than the depth of the notch 21 of the positioning member 20, that is, the length in the axial direction. Since the engaging member 30 has a symmetrical shape, the front-rear arrangement may be reversed.

The engaging member 30 is formed in a tubular shape having both end faces parallel to each other and having a cylindrical inner surface shape. At the time of assembly, the outer peripheral surface portion of the engaging member 30 facing the inner surface of the barrel 2 forms a cylindrical outer surface 31 having a relatively large curvature. The outer surface 31 has substantially the same curvature as the outer peripheral surface of the positioning member 20. The outer peripheral surfaces on both sides adjacent to the outer surface 31 form flat and parallel side surfaces 32. The distance between the two side surfaces 32 is set to be slightly smaller than the distance between the two end faces 21a defining one notch 21 of the positioning member 20. Therefore, the engaging member 30 can be arranged in the cutout portion 21 so that the end surface 21a of the positioning member 20 and the side surface 32 of the engaging member 30 face each other with a slight gap. At this time, the outer surface 31 of the engaging member 30 is flush with the outer peripheral surface of the positioning member 20.

A circular through hole 33 is formed in the central portion of the outer surface 31. The first protrusion 13 of the switch 10 is inserted into the through hole 33. A spherical recess 34 is formed in a portion of the outer surface that is axially symmetric with the through hole 33 of the outer surface 31. The curvature of the spherical portion of the recess 34 is set so that the spherical first elastic member 70, which will be described later, fits. A protruding engaging portion 35 having a flat upper surface is formed on the inner surface of the portion where the recess 34 is formed. The engaging member 30 is integrally formed of a relatively hard resin material such as polycarbonate resin.

FIG. 14 is a perspective view of the spring holding member 40, and FIG. 15 is a vertical sectional view of the spring holding member 40. The spring holding member 40 is arranged in the shaft cylinder 2 so that the left side is the front side of the heat-discoloring writing tool 1 and the right side is the rear side of the heat-discoloring writing tool 1 in FIG. The spring holding member 40 is a cylindrical member having both end faces parallel to each other. The outer diameter of the spring holding member 40 is set to be slightly smaller than the outer diameter of the rear shaft 5, and is the same as the outer diameter of the positioning member 20.

The spring holding member 40 is formed with two receiving portions 41, which are cut out in a minute rectangular shape from the rear end surface toward the front, facing each other. The spring holding member 40 is arranged in the axle cylinder 2 so that its front end surface abuts on the rear end surface of the positioning member 20, and each of the receiving portions 41 is fitted with the rotation stopper 5d of the rear shaft 5. Is placed in. By fitting the receiving portion 41 of the spring holding member 40 with the rotation stopper 5d of the rear shaft 5, the spring holding member 40 is prevented from rotating around the central axis in the axle cylinder 2.

Three circular and shallow recesses 42 are formed on the outer peripheral surface of the spring holding member 40, corresponding to the number of cursive writing bodies 6. A flat flat surface 43 is formed on the inner surface of the portion where the recess 42 is formed. The spring holding member 40 is integrally formed of a relatively hard resin material such as polycarbonate resin.

FIG. 16 is a vertical cross-sectional view of the weight member 50. The weight member 50 is arranged in the shaft cylinder 2 so that the left side is the front side of the heat-discoloring writing tool 1 and the right side is the rear side of the heat-discoloring writing tool 1 in FIG. The thermochromic writing instrument 1 has three weight members 50 corresponding to the number of cursive bodies 6. The weight member 50 is a columnar solid member having a fan-shaped cross-sectional shape divided according to the number of cursive bodies 6 (FIG. 2). Each of the weight members 50 is arranged between the three guide walls 5e in the rear space separated by the partition wall 5b of the rear axle 5. The weight member 50 acts as a weight that moves back and forth according to the posture of the thermochromic writing tool 1, that is, in the direction in which gravity acts. A circular insertion hole 51 is formed on the front end surface of the weight member 50. The weight member 50 is formed of a metal material such as aluminum or brass.

FIG. 17 is a side view of the engaging rod 60. The engaging rod 60 is arranged in the barrel 2 so that the left side is the front side of the heat-discoloring writing tool 1 and the right side is the rear side of the heat-discoloring writing tool 1 in FIG. The thermochromic writing instrument 1 has three engaging rods 60 corresponding to the number of cursive bodies 6. The engaging rod 60 is a rod-shaped member as a whole, and has an engaging rod main body 61. The front end portion and the rear end portion of the engaging rod 60 are formed to have a small diameter in the engaging rod main body 61. That is, a writing body fitting portion 62 that is inserted into and fitted to the rear end portion of the tubular writing body 6 is formed at the front end portion of the engaging rod 60. At the rear end of the engaging rod 60, an insertion portion 63 that is inserted into and fitted into the insertion hole 51 of the weight member 50 is formed. The cursive 6 and the weight member 50 are integrally connected by the engaging rod 60.

The engaging rod body 61 is formed with two annular recesses that are parallel to each other along the axial direction. As will be described later, the recess arranged on the front side is a non-writing maintenance recess 64 that engages with the engaging portion 35 of the engaging member 30 so as to maintain the non-writing state, and the recess arranged on the rear side is A writing maintenance recess 65 that engages with the engaging portion 35 of the engaging member 30 so as to maintain the writing state. The engaging rod 60 is integrally formed of a relatively hard resin material such as polycarbonate resin, but may be formed of a metal material such as aluminum or brass.

The first elastic member 70 is a spherical member made of a rubber material such as silicone rubber or an elastic material such as a thermoplastic elastomer such as a polyester elastomer. Since the first elastic member 70 is formed in a spherical shape, the same restoring force can be obtained regardless of which direction the first elastic member 70 is compressed and elastically deformed. The thermochromic writing instrument 1 has only one first elastic member 70, regardless of the number of cursive bodies 6.

The thermochromic writing instrument 1 has three second elastic members 80 corresponding to the number of cursive bodies 6. Each of the second elastic members 80 is arranged in the recess 42 of the spring holding member 40, as shown in FIG. In the present embodiment, the second elastic member 80 is a dome spring. The dome spring is an elastic member obtained by processing a material made of a thin plate such as a metal into a dome shape, and when the apex of the dome is pressed and elastically deformed, a corresponding restoring force is obtained. This dome spring is, for example, a dome spring made of metal and formed to be thin. The second elastic member 80 may be a member on which other elastic members such as a coil spring, a rubber elastic material such as silicone rubber, or a thermoplastic elastomer such as a polyester elastomer are arranged.

The relationship between the members of the thermochromic writing tool 1 will be described with reference to FIGS. 3 to 6, especially FIGS. 5 and 6. As shown in FIG. 5, the positioning member 20 and the spring holding member 40 are sandwiched between the rear end surface of the front shaft 4 and the front end surface of the partition wall 5b of the rear shaft 5 in the axle cylinder 2. It is fixed. As described above, the engaging member 30 is arranged in each of the three notched portions 21 of the positioning member 20. As a result, the three engaging members 30 are arranged at equal intervals along the circumferential direction. Since the total length of the engaging member 30 is slightly shorter than the axial length of the notch 21 of the positioning member 20, the axial movement of the engaging member 30 is caused by the notch 21 and the spring holding member 40. The engaging member 30 can move in the radial direction while being regulated by the rear end surface.

Referring to FIG. 6, the three engaging members 30 are arranged around the central axis of the thermochromic writing tool 1, and the first elastic member 70 is arranged at the center position of the three engaging members 30. That is, the first elastic member 70 is arranged near the central axis of the barrel 2 corresponding to the portion of the switch 10. More specifically, the first elastic member 70 fits into each recess 34 of the three engaging members 30 and is arranged so as to be supported from three directions.

As shown in FIG. 5, the three switches 10 are arranged in the three mounting holes 5a of the rear axle 5, respectively. At this time, the first protrusion 13 of the switch 10 is inserted into the through hole 33 of the engaging member 30, and the second protrusion 14 of the switch 10 is arranged in the recess 42 of the spring holding member 40. 2 Arranged so as to abut the elastic member 80. That is, the second protrusion 14 of the switch 10 is arranged at the dome-shaped apex of the dome spring. The cursive 6, the engaging rod 60, and the weight member 50, which are integrally connected, pass through the through hole 5c of the rear shaft 5, the spring holding member 40, and the positioning member 20, that is, the corresponding engaging member 30. , Arranged in the barrel 2.

When the switch 10 is pressed, the engaging member 30 moves inward in the radial direction via the first protrusion 13, the first elastic member 70 is elastically deformed, and the second elastic member 80 is elastically deformed by the second protrusion 14. Is elastically deformed. When the pressure of the switch 10 is released, the engaging member 30 and the switch 10 are returned to their original positions by the restoring force of the first elastic member 70 and the second elastic member 80, respectively. Since the switch 10 has the recess 15, the switch 10 can be pressed without interfering with the spring holding member 40.

When the switch 10 is not pressed, the first elastic member 70 is not elastically deformed or slightly elastically deformed to urge the switch 10. That is, the engaging member 30 is located closer to the outer side in the radial direction in the barrel 2 of the thermochromic writing tool 1. At this time, the engaging portion 35 of the engaging member 30 is arranged in either of the two recesses formed in the engaging rod 60, that is, in the non-writing maintenance recess 64 or in the writing maintenance recess 65. Therefore, the engaging portion 35 of the engaging member 30 and the concave portion which is the engaged portion of the engaging rod 60 engage in the axial direction, restricting the forward / backward movement of the writing body 6, and the non-writing state or the writing state is maintained. Be maintained.

On the other hand, when the switch 10 is pressed, as described above, the engaging member 30 moves inward in the radial direction, so that the first protrusion 13 presses the first elastic member 70, and the first elastic member 70 moves in the radial direction. Elastically deforms to. As a result, the engaging portion 35 of the engaging member 30 moves inward in the radial direction, so that the path obstructed by the engaging portion 35 is opened and the cursive body 6 can be moved back and forth. Become.

FIG. 18 is an enlarged vertical cross-sectional view illustrating switching between the non-writing state and the writing state of the thermochromic writing instrument 1 of FIG. FIG. 18A shows the non-writing state of the thermochromic writing instrument 1, and shows the same state as the thermochromic writing instrument 1 shown in FIG. That is, in FIG. 18A, the engaging portion 35 of the engaging member 30 is arranged in the non-writing maintenance recess 64.

FIG. 18B shows a state in which the switch 10 is pressed. That is, due to the radial movement of the engaging member 30, the engaging portion 35 moves inward in the radial direction until the engaging rod 60 is disengaged from the non-writing maintenance recess 64. As a result, the engaging rod 60 can freely move in the barrel 2 in the front-rear direction. That is, when the posture of the heat-discoloring writing instrument 1 is changed while pressing the switch 10, the engaging rod is caused by the gravity acting on the writing body 6, the engaging rod 60 and the weight member 50, that is, its own weight, which are integrally connected. 60 moves forward or backward in the barrel 2.

When the user grips the thermochromic writing tool 1 so that the front end faces downward while pressing the switch 10, the engaging rod 60 moves forward by gravity. The forward movement of the engaging rod 60 is regulated by the contact between the weight member 50 and the partition wall 5b of the rear shaft 5. When the pressure of the switch 10 is released at this time, the engaging member 30 moves in the radial direction due to the restoring force of the first elastic member 70, and the engaging portion 35 engages with the engaging rod as shown in FIG. 18C. It is arranged in the writing maintenance recess 65 of 60. As a result, the engaging member 30 and the engaging rod 60 are engaged with each other, and the writing state is maintained.

On the other hand, the user grips the thermochromic writing tool 1 so that the front end faces upward while disengaging the engaging portion 35 from the writing maintenance recess 65 of the engaging rod 60 by pressing the switch 10. Then, the engaging rod 60 moves backward due to gravity. The rearward movement of the engaging rod 60 is restricted by the contact between the weight member 50 and the portion of the clip member 3 inserted into the rear end portion of the rear shaft 5. When the pressure of the switch 10 is released at this time, the engaging member 30 moves in the radial direction due to the restoring force of the first elastic member 70, and the engaging portion 35 engages with the engaging rod as shown in FIG. 18A. It is arranged in the non-writing maintenance recess 64 of 60. As a result, the engaging member 30 and the engaging rod 60 are engaged with each other, and the non-writing state is maintained.

According to the present invention, the engagement between the engaging portion 35 of the engaging member 30 and the non-writing maintenance recess 64 or the writing maintenance recess 65 of the engaging rod 60 is within the radial direction of the engaging member 30 due to the pressing of the switch 10. Since it is released by moving toward, it is possible to easily and surely switch between the written state and the non-written state. Further, since the engaging portion 35 of the engaging member 30 has an appropriate clearance in the front-rear direction while being arranged in the non-writing maintenance recess 64 or the writing maintenance recess 65 of the engaging rod 60, the switch 10 It does not interfere with the pressing operation of. Further, since the writing body 6, the engaging rod 60, and the weight member 50 are integrally connected and the weight member 50 plays the role of a weight, the writing body 6 operates smoothly and stably, and the writing state and the non-writing state And can be reliably switched.

When the switch 10 corresponding to the cursive 6 selected for writing is pressed, the first elastic member 70 is pressed via the engaging member 30. The movement of the first elastic member 70 is regulated by the engaging member 30 corresponding to the other two cursive bodies 6 not selected. That is, since the other two engaging members 30 and the switch 10 cannot move outward in the radial direction any more, as a result, as described above, the first elastic member 70 is elastically deformed. In other words, while pressing any one of the selected switches 10, the other switch 10 receives a force in the opposite direction, so that the other switch 10 cannot be moved inward in the radial direction. Therefore, in the thermochromic writing instrument 1, only the selected switch 10 can be reliably pressed, and the writing state and the non-writing state can be easily set for one cursive 6 selected from the plurality of cursives 6. You can definitely switch.

According to the present invention, since it is sufficient to secure a stroke in the radial direction of the switch 10 corresponding to the distance required for engaging and disengaging the engaging member 30 and the engaging rod 60, the outer diameter is smaller than that of the conventional product. It is possible to realize a thermochromic writing tool.

In the present embodiment, the thermochromic writing instrument 1 has three cursive bodies 6, but may be two or four or more. The first elastic member 70 is a cylinder or a polygonal column arranged along an axial direction, for example, a shape other than a sphere, as long as an equal restoring force is generated with respect to the engaging member 30 arranged around the first elastic member 70. You may.

As described above, since the second elastic member 80, that is, the dome spring in the present embodiment is elastically deformed by the pressing of the switch 10, the user can feel a certain click feeling with a short pressing stroke. It is possible to obtain a comfortable operation feeling. The second elastic member 80 is used to obtain such a comfortable operation feeling and to support the reliable return of the switch 10, but it may be omitted.

Examples of the embodiment based on the present embodiment include the following embodiments. As the first embodiment, the writing portion 6a of the cursive 6 is a ballpoint pen tip, and the ball diameter of each ballpoint pen tip is 0.38 mm, 0.5 mm, 0.7 mm or 0.5 mm, 0.7 mm, 1.0 mm. It is possible to provide a composite type thermochromic ballpoint pen that can obtain a handwriting of a different thickness from the above. Further, it is preferable that the contact surface 92 of the friction portion 90 also has a different shape. Further, in order to make each writing distance substantially the same, it is preferable to make the inner diameter of the writing body 6 different while making the amount of ink of the writing body 6 different according to the ball diameter so that the ink length is substantially the same.

As the second embodiment, when the heat-discoloring ink contained in the cursive 6 is heated to 60 to 70 ° C., it changes to another color (second color), and then cooled to -15 to -5 ° C. The cursive that returns to the original color (first color), and the other cursive 6 change to another color (second color) when the temperature is raised to 75 to 85 ° C. When cooled to 0 to 10 ° C, the cursive returns to the original color (first color), and when the temperature is raised to 40 to 50 ° C, it changes to another color (second color). After that, when cooled to 35 to -25 ° C, the cursive has the property of returning to the original color (first color), and by making each discoloration temperature different, even in various temperature environments around the world. It is possible to provide a thermochromic writing tool that can withstand use.

1 Thermal discoloration writing instrument 2 Axle cylinder 4 Front shaft 5 Rear shaft 6 Cursive 10 Switch 20 Positioning member 30 Engagement member 35 Engagement part 40 Spring holding member 50 Weight member 60 Engagement rod 70 1st elastic member 80 2nd elastic Member 90 Friction part

Claims (2)

A heat-discoloring writing instrument capable of discoloring handwriting by frictional heat, which is a writing instrument that is movably arranged in the shaft cylinder and contains at least one heat-color-changing ink, and the shaft cylinder. A pressing member which is an operation portion provided on a side surface and a friction portion capable of discoloring the handwriting of the heat-discoloring ink are provided, and the friction portion is formed on the outer surface of the pressing member, and the pressing member is the shaft. A thermochromic writing instrument characterized by being installed in the middle part of the cylinder. Corresponding to the shaft cylinder, a plurality of cursive bodies movably arranged in the shaft cylinder, and a plurality of pressing members provided on the side surface of the shaft cylinder, engaging with each of the cursive bodies in the axial direction. A plurality of engaging portions for restricting the movement of the cursive and a first elastic member arranged in the vicinity of the central axis of the barrel corresponding to the pressing member are provided.
When the pressing member is pressed in the radial direction, the engaging portion is disengaged so that the corresponding cursive can be moved by gravity, and the first elastic member is compressed in the radial direction to release the pressing. Then, the engaging portion engages with the cursive by the restoring force of the first elastic member, further includes a plurality of engaging members formed in a tubular shape, and the engaging portion is the engaging member of the engaging member. The first elastic member provided on the inner surface is spherical, and further includes a second elastic member that assists the return of the pressing member by releasing the pressing, and the second elastic member is a thin plate plate. The thermochromic writing tool according to claim 1, wherein the spring is a dome-shaped spring.