JP2022182698A - Friction body and thermochromic writing instrument - Google Patents

Abstract

To provide a friction body and a thermochromic writing instrument that can be used by selecting the friction portion of the friction body and enable stable friction operation.SOLUTION: A friction body 1 includes a hard friction member 2 and a soft friction member 3 made of rubber elastic materials having different hardnesses. The hardness of the hard friction member 2 is set higher than that of the soft friction member 3. The soft friction member 3 is provided on the outer surface of the hard friction member 2. The upper end of the hard friction member 2 is provided above the soft friction member 3. A mounting portion 22 consisting of a recess or a hole is formed on the outer surface below the upper end of the hard friction member 2. The soft friction member 3 is detachably fitted to the mounting portion 22.SELECTED DRAWING: Figure 2

Description

TECHNICAL FIELD The present invention relates to a friction body and a thermochromic writing instrument.

In Patent Document 1, a friction body is provided at the rear end of a shaft cylinder, and a second friction body is detachably mounted radially outward of the friction body, and the hardness of the second friction body is Harder configurations are described.

JP 2016-124128 A

In the conventional thermochromic writing instrument, when the friction body is excessively soft, the friction body and the second friction body wobble during the friction operation using the friction body, or the friction body sinks into the second friction body. There is a possibility that it may become difficult to perform a stable friction operation.

The present invention solves the above-mentioned conventional problems, and aims to provide a friction body and a thermochromic writing instrument that can select and use the friction portion of the friction body and enable stable friction operation. It is. In the present invention, "upper" refers to the side of the friction portion (upper in the drawings), and "lower" refers to the opposite side.

A first invention of the present application is a friction body capable of thermally discoloring the thermochromic image or handwriting by rubbing a thermochromic image or handwriting formed on a writing surface and generating frictional heat. a hard friction member and a soft friction member made of rubber elastic materials having different hardnesses, the hardness of the hard friction member is set higher than that of the soft friction member, and the soft friction member is provided on the outer surface of the hard friction member. A member is provided, and the upper end of the hard friction member is provided above the soft friction member.

In the friction body of the first invention, the friction part of the friction body (that is, the friction part of the hard friction member or the friction part of the soft friction member) is selected according to the handwriting or user's preference. In addition, a stable friction operation can be performed using any friction portion.

In a second invention of the present application, in the friction body according to the first invention, a mounting portion composed of a recess or a hole is formed in the outer surface below the upper end portion of the hard friction member, and the soft friction member is formed in the mounting portion. It is a requirement that the members be detachably fitted.

In the friction body of the second aspect of the invention, due to the above configuration, the soft friction member can be easily replaced even if the soft friction member is worn.

In a third invention of the present application, a plurality of writing bodies containing thermochromic ink are accommodated in a barrel so as to be movable in the axial direction, and the writing tips of the writing bodies are selected from the tip holes of the barrel. A thermochromic writing instrument constructed so as to be able to appear in and out of the thermochromic writing instrument, wherein the friction body of the first invention or the second invention is provided at the tail end of the barrel.

In the thermochromic writing instrument of the third invention, the friction portion of the friction body (that is, the friction portion of the hard friction member or the friction portion of the soft friction member) can be adjusted according to the handwriting or user's preference. can be selected and used, and a stable friction operation can be performed using any friction portion.

The hard friction member and the soft friction member of the present invention are made of a material having rubber elasticity. Examples thereof include synthetic resins (rubber, elastomer) having rubber elasticity. butadiene-styrene copolymer), SEBS resin (styrene-ethylene-butylene-styrene copolymer), polyester resin, olefin resin, ethylene propylene diene rubber (EPDM), and the like. The hard friction member and soft friction member of the present invention are preferably obtained by injection molding a thermoplastic elastomer (eg, polyester elastomer, styrene elastomer). The hardness of the hard friction member and the hardness of the soft friction member of the present invention are measured by durometer hardness (type A) or durometer hardness (type D) defined in JISK6253. Materials constituting the hard friction member and the soft friction member of the present invention may be of the same type or different types as long as they have different hardnesses. The friction body (hard friction member and soft friction member) of the present invention can be used not only for thermally discoloring a thermochromic image or handwriting, but also as a friction body for erasing handwriting with a lead (pencil lead).

In the present invention, the thermochromic ink is preferably a reversible thermochromic ink. Reversible thermochromic ink is a heat decoloring type in which the color is decolored by heating from a colored state, a color memory retention type in which the colored state or decolored state is alternately stored in a specific temperature range, or a decolored state is heated. Various types can be used alone or in combination, such as a heat coloring type that develops color by heating and returns to a decolored state by cooling from the colored state.

The thermochromic ink in the present invention uses a thermochromic microcapsule pigment, and includes (a) an electron-donating color-forming organic compound, (b) an electron-accepting compound, and (c) coloration of both of the above. An aqueous ink composition containing a reversible thermochromic microcapsule pigment encapsulating a reversible thermochromic composition comprising a reaction medium that determines the temperature at which the reaction occurs is employed.

Furthermore, in the reversible thermochromic microcapsule pigment or in the ink, a colorant such as a non-thermochromic dye or pigment is blended to achieve a tautomatic color from colored (1) to colored (2). It can also be configured to present a change. Acid dyes, basic dyes, direct dyes, and fluorescent dyes can all be used as the dye. Examples of the pigment include general pigments and special pigments. Examples of general pigments include inorganic pigments such as carbon black and ultramarine blue, organic pigments such as copper phthalocyanine blue and benzidine yellow, and dispersed pigment products finely and stably dispersed in a medium in advance using a surfactant or the like. etc. are used. Examples of the special pigments include metallic luster pigments such as metal powders and pearl pigments, fluorescent pigments, phosphorescent pigments, and titanium dioxide. These colorants may be used in combination with the aforementioned microcapsule pigment, or may be included in the aforementioned microcapsule pigment.

In particular, when a metallic luster pigment is added to a thermochromic ink, a metallic ink can be formed, so that when writing, glossy and decorative handwriting is formed, which makes the ink more useful. Moreover, when the above-mentioned thermochromic microcapsule pigment is used as a coloring agent, the handwriting on white paper obtained when the thermochromic microcapsule pigment becomes transparent does not have luster and seems to be completely erased. Transparent metallic luster pigments are useful because they are visually visible.

In the case of a thermochromic ink containing a metallic luster pigment, in order to erase the handwriting on the paper surface with a rubbing body, it is necessary to thermally discolor by frictional heat and peel off the metallic luster pigment. Therefore, in the case of a thermochromic ink containing a special pigment such as a metallic luster pigment, it is preferable to use a soft friction member as the friction body. On the other hand, in the case of a thermochromic ink that does not contain a special pigment such as a metallic luster pigment, it is preferable to use a hard friction member as the friction body.

INDUSTRIAL APPLICABILITY The friction body of the present invention can be used by selecting the friction portion of the friction body and enables stable friction operation.

The thermochromic writing instrument of the present invention can be used by selecting the friction portion of the friction body and enables stable friction operation.

1 is a perspective view of a first embodiment of a friction body of the present invention; FIG. FIG. 2 is a longitudinal sectional view of FIG. 1; FIG. 3 is a vertical cross-sectional view of a state in which the hard friction member and the soft friction member of FIG. 2 are separated; FIG. 2 is a vertical cross-sectional view of the essential part of the thermochromic writing instrument with the friction body of FIG. 1 attached to the tail end of the barrel; FIG. 5 is a front view of a thermochromic writing instrument having the barrel of FIG. 4; FIG. 4 is a perspective view of a second embodiment of the friction body of the present invention; FIG. 7 is a longitudinal sectional view of FIG. 6; FIG. 8 is a vertical cross-sectional view of a state in which the hard friction member and the soft friction member of FIG. 7 are separated; FIG. 7 is a vertical cross-sectional view of the essential part of the thermochromic writing instrument with the friction body of FIG. 6 attached to the tail end of the barrel; FIG. 10 is a front view of a thermochromic writing instrument having the barrel of FIG. 9; FIG. 11 is a perspective view of a third embodiment of the friction body of the present invention; FIG. 12 is a longitudinal sectional view of FIG. 11; FIG. 13 is a vertical cross-sectional view of a state in which the hard friction member and the soft friction member of FIG. 12 are separated; FIG. 12 is a longitudinal cross-sectional view of the essential part of the thermochromic writing instrument with the friction body of FIG. 11 attached to the tail end of the barrel; FIG. 15 is a front view of a thermochromic writing instrument having the barrel of FIG. 14;

<First embodiment>
A first embodiment of the present invention is shown in FIGS. 1 to 5. FIG.

Friction body The friction body 1 consists of a hard friction member 2 and a soft friction member 3 . The rubber elastic material forming the hard friction member 2 has a durometer hardness (type A) set in the range of 81-95. The durometer hardness (type A) of the rubber elastic material forming the soft friction member 3 is set in the range of 70-80. The hardness of the hard friction member 2 is set higher than that of the soft friction member 3 . The hardness of the soft friction member 3 is set lower than that of the hard friction member 2 . The hard friction member 2 is composed of a styrene-based elastomer. The soft friction member 3 is made of polyester elastomer.

Hard Friction Member The hard friction member 2 is a bottomed cylindrical body with a closed upper end and an open lower end, and a convex curved friction portion 21 is formed at the upper end. A mounting portion 22 made of an annular recess is formed on the lower outer surface (peripheral surface) of the friction portion 21 . An insertion portion 23 that can be fitted into the mounting hole 51 of the shaft tube 5 is formed behind the mounting portion 22 . An outward projection 23 a is integrally formed on the outer surface of the insertion portion 23 . The outward projection 23a axially overcomes the inward projection 51a on the inner surface of the mounting hole 51 of the shaft cylinder 5 and engages to prevent it from coming off. The outward projection 23a is composed of an annular projection or a plurality of circumferentially distributed projections. An annular collar portion 24 is integrally formed below the attachment portion 22 and above the insertion portion 23 . Below the mounting portion 22 of the hard friction member 2 and above the flange portion 24, a mounting portion 25 having a cylindrical outer surface is formed.

Soft Friction Member The soft friction member 3 is composed of a cylindrical body having an inner hole 32 extending therethrough in the axial direction. An annular projection 32 a is formed integrally with the inner surface of the inner hole 32 . A cylindrical mounting portion 33 is formed on the inner surface of the cylindrical body below the convex portion 32a. The annular convex portion 32a is detachably fitted to the mounting portion 22 (annular concave portion) of the hard friction member 2, and the mounting portion 33 is fitted to the mounted portion 25 (cylindrical outer surface) of the hard friction member 2. Attached detachably. With the soft friction member 3 attached to the outer surface of the hard friction member 2 , the lower end of the soft friction member 3 abuts against the flange 24 of the hard friction member 2 . A convex curved friction portion 31 is formed on the upper edge portion of the soft friction member 3 . The friction portion 31 is positioned radially outward of the annular convex portion 32a of the soft friction member 3 (that is, the portion that fits into the concave portion). The friction portion 31 of the soft friction member 3 protrudes radially outward from the friction portion 21 of the hard friction member 2 .

Thermochromic writing instrument The thermochromic writing instrument 4 includes a barrel 5 and a plurality of writing bodies accommodated in the barrel 5 so as to be movable in the axial direction. It is a multicore type writing instrument that can be selectively retracted from the tip hole of the barrel 5 . Each writing body contains thermochromic ink, and the thermochromic ink can be discharged from the writing tip. In the multi-core type thermochromic writing instrument 4, the retracting mechanism adopts a slide type that slides the operation part 6 attached to each writing body downward in the axial direction. A rotary type to operate may be adopted.

As the thermochromic ink, a type that does not contain a special pigment such as a metallic luster pigment and a type that contains a special pigment such as a metallic luster pigment are employed. That is, in the shaft cylinder 5, there are a writing body containing a thermochromic ink that does not contain a special pigment such as a metallic luster pigment, and a writing body containing a thermochromic ink containing a special pigment such as a metallic luster pigment. Prepare. Handwriting of thermochromic ink that does not contain special pigments such as metallic luster pigments can be properly erased by using the friction portion 21 of the hard friction member 2, and handwriting of thermochromic inks that contain special pigments such as metallic luster pigments. can be properly erased using the friction portion 31 of the soft friction member 3 .

A mounting hole 51 opening upward in the axial direction is formed at the tail end of the barrel 5 . An inward projection 51 a is formed on the inner surface of the mounting hole 51 . The inward protrusion 51a may be configured as an annular protrusion or configured as a plurality of protrusions distributed in the circumferential direction. The insertion portion 23 of the hard friction member 2 is inserted into the mounting hole 51, and after the inward projection 51a of the mounting hole 51 and the outward projection 23a of the insertion portion 23 get over each other in the axial direction, they are engaged to prevent slippage. At the same time, the lower end of the flange portion 24 is brought into contact with the upper end of the barrel 5 .

・As for the detachable rubber elastic material of the friction member, the soft material wears more easily than the hard material. Therefore, the soft friction member 3 wears more easily than the hard friction member 2 . When the friction portion 31 of the soft friction member 3 wears, the worn soft friction member 3 is removed from the hard friction member 2, and a new soft friction member 3 is attached to the hard friction member 2, so that the soft friction member 3 can be replaced. . Since the friction portion 31 is positioned radially outward of the convex portion 32a of the soft friction member 3, the thickness of the friction portion 31 becomes thin due to wear. The fitting can be easily released, and the soft friction member 3 can be easily removed. Also, when the soft friction member 3 is attached to the hard friction member 2 or removed from the hard friction member 2, part or the whole of the soft friction member 3, which is easily elastically deformed, is elastically deformed in the radial direction. , the soft friction member 3 can be easily attached and detached.

The frictional body 1 of the first embodiment of the present application rubs a thermochromic image or handwriting formed on a writing surface, and heat-discolors the thermochromic image or handwriting with the frictional heat generated at that time. a friction body comprising a hard friction member 2 and a soft friction member 3 made of rubber elastic materials having different hardnesses, the hardness of the hard friction member 2 being set higher than the hardness of the soft friction member 3, The soft friction member 3 is provided on the outer surface of the hard friction member 2 , and the upper end portion of the hard friction member 2 is provided above the soft friction member 3 . As a result, the friction body 1 of the first embodiment can be adjusted according to handwriting or user's preference. The friction portion 31) can be selected and used, and a stable friction operation can be performed using any of the friction portions 21 and 31.

In the friction body 1 of the first embodiment of the present application, a mounting portion 22 consisting of a recess is formed on the outer surface below the upper end portion of the hard friction member 2, and the soft friction member 3 is attached to and detached from the mounting portion 22. Fits freely. As a result, in the friction body 1 of the first embodiment, even if the soft friction member 3 wears, the soft friction member 3 can be easily replaced.

In the thermochromic writing instrument 4 of the first embodiment of the present application, a plurality of writing bodies containing thermochromic ink are accommodated in a barrel 5 so as to be movable in the axial direction, and the writing tips of the writing bodies are The friction body 1 is provided at the rear end of the barrel 5 so that it can be selectively retracted from the tip hole of the barrel 5 . As a result, the thermochromic writing instrument 4 of the first embodiment can change the friction portion of the friction body 1 (that is, the friction portion 21 of the hard friction member 2 or the soft friction portion) according to the handwriting or user's preference. The friction portion 31) of the member 3 can be selected and used, and a stable friction operation can be performed using any of the friction portions 21 and 31.

<Second Embodiment>
A second embodiment of the invention is shown in FIGS.

Friction body The friction body 1 consists of a hard friction member 2 and a soft friction member 3 . The rubber elastic material forming the hard friction member 2 has a durometer hardness (type A) set in the range of 81-95. The durometer hardness (type A) of the rubber elastic material forming the soft friction member 3 is set in the range of 70-80. The hardness of the hard friction member 2 is set higher than that of the soft friction member 3 . The hardness of the soft friction member 3 is set lower than that of the hard friction member 2 . The hard friction member 2 is composed of a styrene-based elastomer. The soft friction member 3 is made of polyester elastomer.

Hard Friction Member The hard friction member 2 is a bottomed cylindrical body with a closed upper end and an open lower end, and a convex curved friction portion 21 is formed at the upper end. A mounting portion 22 made of an annular recess is formed on the lower outer surface (peripheral surface) of the friction portion 21 . The inner surface of the mounting portion 22 has an annular concave surface portion 22a. An insertion portion 23 that can be fitted into the mounting hole 51 of the shaft tube 5 is integrally formed behind the mounting portion 22 . An outward projection 23 a is integrally formed on the outer surface of the insertion portion 23 . The outward projection 23a axially overcomes the inward projection 51a on the inner surface of the mounting hole 51 of the shaft cylinder 5 and engages to prevent it from coming off. The outward projection 23a is composed of an annular projection or a plurality of circumferentially distributed projections. An annular downward stepped portion 26 is formed below the mounting portion 22 and above the insertion portion 23 . A conical outer surface is formed below the mounting portion 22 of the hard friction member 2 and above the downward stepped portion 26 .

Soft Friction Member The soft friction member 3 is composed of an annular body (O-ring-shaped annular body) having an inner hole 32 penetrating in the axial direction. An annular convex curved surface portion 31 a is formed on the outer surface of the soft friction member 3 . An annular convex curved surface portion 32 a is formed on the inner surface of the soft friction member 3 . The inner surface (annular convex curved surface portion 32a) of the soft friction member 3 is detachably fitted to the mounting portion 22 (annular concave curved surface portion 22a) on the outer surface of the hard friction member 2. As shown in FIG. When the soft friction member 3 is attached to the outer surface of the hard friction member 2 , the annular convex curved surface portion 31 a of the outer surface of the soft friction member 3 becomes the friction portion 31 . The friction portion 31 is positioned radially outward of the annular convex curved surface portion 32a (that is, the fitting portion with the concave portion) of the inner surface of the soft friction member 3 . The friction portion 31 of the soft friction member 3 protrudes radially outward from the friction portion 21 of the hard friction member 2 .

Thermochromic writing instrument The thermochromic writing instrument 4 includes a barrel 5 and a plurality of writing bodies accommodated in the barrel 5 so as to be movable in the axial direction. It is a multicore type writing instrument that can be selectively retracted from the tip hole of the barrel 5 . Each writing body contains thermochromic ink, and the thermochromic ink can be discharged from the writing tip. In the multi-core type thermochromic writing instrument 4, the retracting mechanism adopts a slide type that slides the operation part 6 attached to each writing body downward in the axial direction. A rotary type to operate may be adopted.

As the thermochromic ink, a type that does not contain a special pigment such as a metallic luster pigment and a type that contains a special pigment such as a metallic luster pigment are employed. That is, in the shaft cylinder 5, there are a writing body containing a thermochromic ink that does not contain a special pigment such as a metallic luster pigment, and a writing body containing a thermochromic ink containing a special pigment such as a metallic luster pigment. Prepare. Handwriting of thermochromic ink that does not contain special pigments such as metallic luster pigments can be properly erased by using the friction portion 21 of the hard friction member 2, and handwriting of thermochromic inks that contain special pigments such as metallic luster pigments. can be properly erased using the friction portion 31 of the soft friction member 3 .

A mounting hole 51 opening upward in the axial direction is formed at the tail end of the barrel 5 . An inward projection 51 a is formed on the inner surface of the mounting hole 51 . The inward protrusion 51a may be configured as an annular protrusion or configured as a plurality of protrusions distributed in the circumferential direction. The insertion portion 23 of the hard friction member 2 is inserted into the mounting hole 51, and after the inward projection 51a of the mounting hole 51 and the outward projection 23a of the insertion portion 23 get over each other in the axial direction, they are engaged to prevent slippage. At the same time, the lower end of the downward stepped portion 26 is brought into contact with the upper end of the barrel 5 .

・As for the detachable rubber elastic material of the friction member, the soft material wears more easily than the hard material. Therefore, the soft friction member 3 wears more easily than the hard friction member 2 . When the friction portion 31 of the soft friction member 3 wears, the worn soft friction member 3 is removed from the hard friction member 2, and a new soft friction member 3 is attached to the hard friction member 2, so that the soft friction member 3 can be replaced. . Since the friction portion 31 is positioned radially outward of the convex curved surface portion 32a of the inner surface of the soft friction member 3 (i.e., the fitting portion with the concave portion), the friction portion 31 becomes thin due to wear, and the convex curved surface is formed. The engagement between the portion 32a and the mounting portion 22 (annular concave portion) can be easily released, and the soft friction member 3 can be easily removed. Further, when the soft friction member 3 is attached to the hard friction member 2 or removed from the hard friction member 2, the soft friction member 3, which is easily elastically deformed, is elastically deformed in the radial direction. 3 can be easily attached and detached.

The frictional body 1 of the second embodiment of the present application rubs a thermochromic image or handwriting formed on a writing surface, and heat-discolors the thermochromic image or handwriting with the frictional heat generated at that time. a friction body comprising a hard friction member 2 and a soft friction member 3 made of rubber elastic materials having different hardnesses, the hardness of the hard friction member 2 being set higher than the hardness of the soft friction member 3, The soft friction member 3 is provided on the outer surface of the hard friction member 2 , and the upper end portion of the hard friction member 2 is provided above the soft friction member 3 . As a result, the friction body 1 of the second embodiment can be adjusted according to handwriting or user's preference. ) can be selected and used, and a stable friction operation can be performed using any one of the friction portions 21 and 31.

In the friction body 1 of the second embodiment of the present application, a mounting portion 22 consisting of a recess is formed on the outer surface below the upper end portion of the hard friction member 2, and the soft friction member 3 is attached to and detached from the mounting portion 22. Fits freely. As a result, in the friction body 1 of the second embodiment, even if the soft friction member 3 wears, the soft friction member 3 can be easily replaced.

In a thermochromic writing instrument 4 according to a second embodiment of the present application, a plurality of writing bodies containing thermochromic ink are housed in a barrel 5 so as to be movable in the axial direction, and the writing tips of the writing bodies are The friction body 1 is provided at the rear end of the barrel 5 so that it can be selectively retracted from the tip hole of the barrel 5 . As a result, the thermochromic writing instrument 4 of the second embodiment can be changed according to the handwriting or user's preference. The friction portion of the member 3) can be selected and used, and a stable friction operation can be performed using any of the friction portions 21 and 31.

<Third Embodiment>
A third embodiment of the present invention is shown in FIGS. 11-15.

Friction body The friction body 1 consists of a hard friction member 2 and a soft friction member 3 . The rubber elastic material forming the hard friction member 2 has a durometer hardness (type A) set in the range of 81-95. The durometer hardness (type A) of the rubber elastic material forming the soft friction member 3 is set in the range of 70-80. The hardness of the hard friction member 2 is set higher than that of the soft friction member 3 . The hardness of the soft friction member 3 is set lower than that of the hard friction member 2 . The hard friction member 2 is composed of a styrene-based elastomer. The soft friction member 3 is made of polyester elastomer.

Hard Friction Member The hard friction member 2 is a bottomed cylindrical body with a closed upper end and an open lower end, and a convex curved friction portion 21 is formed at the upper end. A mounting portion 22 made of a hole penetrating in the radial direction is formed in the lower outer surface of the friction portion 21 . An insertion portion 23 that can be fitted into the mounting hole 51 of the shaft tube 5 is integrally formed behind the mounting portion 22 . An outward projection 23 a is integrally formed on the outer surface of the insertion portion 23 . The outward projection 23a axially overcomes the inward projection 51a on the inner surface of the mounting hole 51 of the shaft cylinder 5 and engages to prevent it from coming off. The outward projection 23a is composed of an annular projection or a plurality of circumferentially distributed projections. An annular downward stepped portion 26 is formed below the mounting portion 22 and above the insertion portion 23 . A conical outer surface is formed below the mounting portion 22 of the hard friction member 2 and above the downward stepped portion 26 .

Soft Friction Member The soft friction member 3 consists of a plate-like body having a pair of opposing trapezoidal side surfaces. Each trapezoidal side has an upper base and a lower base that is longer than the upper base. It has a pair of opposing rectangular side surfaces between each trapezoidal side surface. The soft friction member 3 has convex curved surface portions formed on the ridgeline between the side surfaces, the ridgeline between the upper surface and the side surface, and the ridgeline portion between the lower surface and the side surface. The soft friction member 3 is detachably fitted into the mounting portion 22 formed by the hole of the hard friction member 2 . When the soft friction member 3 is fitted on the outer side surface of the hard friction member 2 , both rectangular side surfaces of the soft friction member 3 protrude radially outward, and the protruding portions become friction portions 31 . Each friction portion 31 (projecting portions on both sides) of the soft friction member 3 has a bulging portion 34 that can be engaged with the opening edge of the mounting portion 22 . By engaging each bulging portion 34 with the opening edge portion of the mounting portion 22, the soft friction member 3 is prevented from coming off.

Thermochromic writing instrument The thermochromic writing instrument 4 includes a barrel 5 and a plurality of writing bodies accommodated in the barrel 5 so as to be movable in the axial direction. It is a multicore type writing instrument that can be selectively retracted from the tip hole of the barrel 5 . Each writing body contains thermochromic ink, and the thermochromic ink can be discharged from the writing tip. In the multi-core type thermochromic writing instrument 4, the retracting mechanism adopts a slide type that slides the operation part 6 attached to each writing body downward in the axial direction. A rotary type to operate may be adopted.

As the thermochromic ink, a type that does not contain a special pigment such as a metallic luster pigment and a type that contains a special pigment such as a metallic luster pigment are employed. That is, in the shaft cylinder 5, there are a writing body containing a thermochromic ink that does not contain a special pigment such as a metallic luster pigment, and a writing body containing a thermochromic ink containing a special pigment such as a metallic luster pigment. Prepare. Handwriting of thermochromic ink that does not contain special pigments such as metallic luster pigments can be properly erased by using the friction portion 21 of the hard friction member 2, and handwriting of thermochromic inks that contain special pigments such as metallic luster pigments. can be properly erased using the friction portion 31 of the soft friction member 3 .

A mounting hole 51 opening upward in the axial direction is formed at the tail end of the barrel 5 . An inward projection 51 a is formed on the inner surface of the mounting hole 51 . The inward protrusion 51a may be configured as an annular protrusion or configured as a plurality of protrusions distributed in the circumferential direction. The insertion portion 23 of the hard friction member 2 is inserted into the mounting hole 51, and after the inward projection 51a of the mounting hole 51 and the outward projection 23a of the insertion portion 23 get over each other in the axial direction, they are engaged to prevent slippage. At the same time, the lower end of the downward stepped portion 26 is brought into contact with the upper end of the barrel 5 .

・As for the detachable rubber elastic material of the friction member, the soft material wears more easily than the hard material. Therefore, the soft friction member 3 wears more easily than the hard friction member 2 . When the friction portion 31 of the soft friction member 3 wears, the worn soft friction member 3 is removed from the hard friction member 2, and a new soft friction member 3 is attached to the hard friction member 2, so that the soft friction member 3 can be replaced. .

The frictional body 1 of the third embodiment of the present application rubs a thermochromic image or handwriting formed on a writing surface, and heat-discolors the thermochromic image or handwriting with the frictional heat generated at that time. a friction body comprising a hard friction member 2 and a soft friction member 3 made of rubber elastic materials having different hardnesses, the hardness of the hard friction member 2 being set higher than the hardness of the soft friction member 3, The soft friction member 3 is provided on the outer surface of the hard friction member 2 , and the upper end portion of the hard friction member 2 is provided above the soft friction member 3 . As a result, the friction body 1 of the third embodiment can be adjusted according to handwriting or user's preference. The friction portion 31) can be selected and used, and a stable friction operation can be performed using any of the friction portions 21 and 31.

In the friction body 1 of the third embodiment of the present application, a mounting portion 22 made of a hole is formed in the outer surface below the upper end portion of the hard friction member 2, and the soft friction member 3 is attached to the mounting portion 22. They are detachably fitted. As a result, in the friction body 1 of the third embodiment, even if the soft friction member 3 wears, the soft friction member 3 can be easily replaced.

In a thermochromic writing instrument 4 according to a third embodiment of the present application, a plurality of writing bodies containing thermochromic ink are accommodated in a barrel 5 so as to be movable in the axial direction, and the writing tips of the writing bodies are The friction body 1 is provided at the rear end of the barrel 5 so that it can be selectively retracted from the tip hole of the barrel 5 . As a result, the thermochromic writing instrument 4 of the third embodiment can be adapted to the friction portion of the friction body 1 (that is, the friction portion 21 of the hard friction member 2 or the soft friction portion) according to the handwriting or user's preference. The friction portion 31) of the member 3 can be selected and used, and a stable friction operation can be performed using any of the friction portions 21 and 31.

1 Friction body 2 Hard friction member 21 Friction portion 22 Mounting portion (concave portion, hole portion)
22a concave surface portion 23 insertion portion 23a outward projection 24 collar portion 25 mounted portion 26 downward stepped portion 3 soft friction member 31 friction portion 31a convex surface portion 32 inner hole 32a convex surface portion 32a convex portion 33 mounting portion 34 swelling portion 4 thermochromic writing instrument 5 shaft tube 51 attachment hole 51a inward projection 6 operation part

Claims (3)

A friction body capable of thermally discoloring the thermochromic image or handwriting by rubbing a thermochromic image or handwriting formed on a writing surface and using frictional heat generated at that time,
Composed of a hard friction member and a soft friction member made of rubber elastic materials having different hardnesses,
the hardness of the hard friction member is set higher than the hardness of the soft friction member;
The soft friction member is provided on the outer surface of the hard friction member,
A friction body, wherein an upper end portion of the hard friction member is provided above the soft friction member. A mounting portion consisting of a recess or a hole is formed on the outer surface below the upper end of the hard friction member,
2. The friction body according to claim 1, wherein said soft friction member is detachably fitted to said attachment portion. A plurality of writing bodies containing thermochromic ink are accommodated in a barrel so as to be movable in the axial direction, and a writing tip portion of the writing bodies can selectively protrude from a tip hole of the barrel, and A thermochromic writing instrument in which the friction body of claim 1 or claim 2 is provided at the tail end of the barrel.

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