JP2020097208A - Thermochromic writing instrument - Google Patents

Thermochromic writing instrument Download PDF

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JP2020097208A
JP2020097208A JP2018237501A JP2018237501A JP2020097208A JP 2020097208 A JP2020097208 A JP 2020097208A JP 2018237501 A JP2018237501 A JP 2018237501A JP 2018237501 A JP2018237501 A JP 2018237501A JP 2020097208 A JP2020097208 A JP 2020097208A
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writing instrument
cap
rear end
thermochromic
convex portion
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井戸 幹也
Mikiya Ido
幹也 井戸
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Pilot Ink Co Ltd
Pilot Corp
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Pilot Ink Co Ltd
Pilot Corp
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Priority to JP2018237501A priority Critical patent/JP2020097208A/en
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Abstract

To provide a cap-type thermochromic writing instrument capable of stably placing a writing instrument body on a desk with a cap removed and preventing the writing instrument body from slipping down even on an inclined desk.SOLUTION: A thermochromic writing instrument 1 includes a writing instrument body 2, and a cap 5 detachably provided on an outer surface of the writing instrument body 2 on a pen tip side. The writing instrument body 2 includes: a barrel 3 containing a thermochromic ink and having a pen tip 31 at the front end; and a friction body 4 provided at the rear end of the barrel 3 and made of an elastic material that rubs the handwriting of the thermochromic ink, in which the handwriting can be thermally discolored by the frictional heat generated at that time. On an outer surface of the friction body 4, a rolling prevention convex portion 41 that projects radially outward is integrally provided.SELECTED DRAWING: Figure 1

Description

本発明は、熱変色性筆記具に関する。 The present invention relates to a thermochromic writing instrument.

特許文献1には、熱変色性インキの筆跡を摩擦した際に生じる摩擦熱で前記筆跡が熱変色する弾性材料からなる摩擦体を軸筒後端に設けた熱変色性筆記具が開示されている。また、特許文献1には、軸筒のペン先側にキャップが嵌合可能なキャップ式形態の熱変色性筆記具が開示されている。 Patent Document 1 discloses a thermochromic writing instrument in which a friction body made of an elastic material whose color is thermally discolored by frictional heat generated when the handwriting of thermochromic ink is rubbed is provided at a rear end of a barrel. .. Further, Patent Document 1 discloses a thermochromic writing instrument in a cap type in which a cap can be fitted on the pen tip side of a barrel.

特開2012−91476号JP2012-91476A

前記特許文献1のキャップ式熱変色性筆記具は、キャップを外した筆記具本体を机上に置くと机上を転がりやすく、机上に安定して置くことができない。 In the cap-type thermochromic writing instrument of Patent Document 1, when the writing instrument body with the cap removed is placed on the desk, the writing instrument body easily rolls on the desk and cannot be placed stably on the desk.

本発明は前記従来の問題点を解決するものであって、キャップを外した状態で、筆記具本体を安定して机上に置くことができ、さらに、さらに、傾斜した机上でも筆記具本体が滑り落ちることを防止できるキャップ式の熱変色性筆記具を提供しようとするものである。
尚、本発明の軸筒において、「前」とはペン先側を指し、「後」とはその反対側を指す。
The present invention is to solve the above conventional problems, the writing instrument main body can be stably placed on the desk with the cap removed, and further, the writing instrument main body does not slip off even on an inclined desk. An object of the present invention is to provide a cap-type thermochromic writing instrument that can be prevented.
In the barrel of the present invention, "front" refers to the pen tip side, and "rear" refers to the opposite side.

本願の第1の発明は、筆記具本体2と、前記筆記具本体2のペン先側外面に着脱自在に設けられるキャップ5と、を備え、前記筆記具本体2が、熱変色性インキを内蔵し且つ前端にペン先31が設けられた軸筒3と、前記軸筒3の後端に設けられ、前記熱変色性インキの筆跡を摩擦しその際に生じる摩擦熱で該筆跡が熱変色可能な弾性材料よりなる摩擦体4と、を備えた熱変色性筆記具であって、前記摩擦体4の外面に径方向外方に突出する転がり防止用の凸部41が一体に設けられることを要件とする。 A first invention of the present application includes a writing instrument main body 2 and a cap 5 detachably provided on an outer surface of the writing instrument body 2 on the pen tip side, wherein the writing instrument body 2 contains a thermochromic ink and a front end A shaft cylinder 3 provided with a pen tip 31 and an elastic material which is provided at the rear end of the shaft cylinder 3 and rubs the handwriting of the thermochromic ink so that the handwriting can be thermally discolored by frictional heat generated at that time. And a friction member 4 formed of the friction member 4. The friction member 4 is provided with a friction member 4, and a rolling prevention convex portion 41 protruding radially outward is integrally provided on the outer surface of the friction member 4.

前記第1の発明の熱変色性筆記具1は、前記弾性材料よりなる摩擦体4の外面に径方向外方に突出する転がり防止用の凸部41が一体に設けられることにより、キャップ5を外した状態で、筆記具本体2を安定して机上に置くことができ、さらに、傾斜した机上でも筆記具本体2が滑り落ちることを防止できる。 In the thermochromic writing instrument 1 according to the first aspect of the present invention, the cap 5 is removed from the friction body 4 made of the elastic material by integrally forming the rolling-preventing convex portion 41 projecting outward in the radial direction. In this state, the writing instrument body 2 can be stably placed on the desk, and further, the writing instrument body 2 can be prevented from sliding down even on an inclined desk.

本願の第2の発明は、前記第1の発明の熱変色性筆記具において、前記キャップ5が前記筆記具本体2の後端部に装着可能に構成され、前記キャップ5が前記筆記具本体2の後端部に装着された状態において、前記キャップ5内に前記凸部41が位置されることを要件とする。 A second invention of the present application is the thermochromic writing instrument of the first invention, wherein the cap 5 is configured to be attachable to a rear end portion of the writing instrument body 2, and the cap 5 is a rear end of the writing instrument body 2. It is a requirement that the convex portion 41 is located in the cap 5 in a state where the convex portion 41 is mounted on the portion.

前記第2の発明の熱変色性筆記具1は、前記キャップ5が前記筆記具本体2の後端部に装着可能に構成され、前記キャップ5が前記筆記具本体2の後端部に装着された状態において、前記キャップ5内に前記凸部41が位置されることにより、筆記使用時のキャップ5の紛失を回避でき、また、前記キャップ5が前記筆記具本体2の後端部に装着された状態において、筆記具全体の長手寸法が長くなることを抑止し、筆記使用時の筆記具の安定した把持が可能となる。 In the thermochromic writing instrument 1 of the second invention, the cap 5 is configured to be attachable to the rear end portion of the writing instrument body 2, and the cap 5 is attached to the rear end portion of the writing instrument body 2. By locating the convex portion 41 in the cap 5, loss of the cap 5 during writing can be avoided, and in the state where the cap 5 is attached to the rear end of the writing instrument body 2, It is possible to prevent the longitudinal dimension of the entire writing instrument from becoming long, and to stably hold the writing instrument when using the writing instrument.

本願の第3の発明は、前記第2の発明の熱変色性筆記具において、前記筆記具本体2の後端部に前記キャップ5が装着された状態において、前記キャップ5の内面が前記凸部41より前方の前記軸筒3の外面に嵌合され、前記キャップ5の内面が嵌合される前記軸筒3の外面の嵌合部21の外径が、前記凸部41を含む摩擦体4の外径より大きいことを要件とする。 A third invention of the present application is, in the thermochromic writing instrument of the second invention, in a state where the cap 5 is attached to a rear end portion of the writing instrument main body 2, the inner surface of the cap 5 is more than the convex portion 41. The outer diameter of the fitting portion 21 on the outer surface of the shaft cylinder 3 fitted to the outer surface of the front shaft cylinder 3 and fitted with the inner surface of the cap 5 is the outer diameter of the friction body 4 including the convex portion 41. It must be larger than the diameter.

前記第3の発明の熱変色性筆記具1は、前記筆記具本体2の後端部に前記キャップ5が装着された際、前記キャップ5の内面が前記凸部41より前方の前記軸筒3の外面に嵌合され、前記キャップ5の内面が嵌合される前記軸筒3の外面の嵌合部21の外径が、前記凸部41を含む摩擦体4の外径より大きいことにより、キャップ5を筆記具本体2の後端部に装着する際、凸部41にキャップ5開口端を当てることなく、キャップ5を筆記具本体2後端部に円滑に装着することができる。 In the thermochromic writing instrument 1 of the third invention, when the cap 5 is attached to the rear end of the writing instrument body 2, the inner surface of the cap 5 is the outer surface of the barrel 3 in front of the convex portion 41. When the outer diameter of the fitting portion 21 on the outer surface of the shaft cylinder 3 into which the inner surface of the cap 5 is fitted is larger than the outer diameter of the friction body 4 including the convex portion 41, the cap 5 When attaching to the rear end of the writing instrument main body 2, the cap 5 can be smoothly attached to the rear end of the writing instrument main body 2 without contacting the opening end of the cap 5 with the convex portion 41.

本願の第4の発明は、前記第2の発明の熱変色性筆記具において、前記筆記具本体2の後端部に前記キャップ5が装着された状態において、前記キャップ5の内面が前記摩擦体4の外面に嵌合されることを要件とする。 A fourth invention of the present application is the thermochromic writing instrument of the second invention, wherein the inner surface of the cap 5 is the friction body 4 when the cap 5 is attached to the rear end portion of the writing instrument body 2. It is required to be fitted to the outer surface.

前記第4の発明の熱変色性筆記具1は、前記筆記具本体2の後端部に前記キャップ5が装着された際、前記キャップ5の内面が前記摩擦体4の外面に嵌合されることにより、キャップ5内面と弾性材料からなる摩擦体4外面とが強固に嵌合され、筆記使用時、筆記具本体2からキャップ5が脱落することを抑止できる。 In the thermochromic writing instrument 1 of the fourth invention, when the cap 5 is attached to the rear end of the writing instrument body 2, the inner surface of the cap 5 is fitted to the outer surface of the friction body 4. The inner surface of the cap 5 and the outer surface of the friction body 4 made of an elastic material are firmly fitted to each other, so that the cap 5 can be prevented from coming off from the writing instrument main body 2 during writing.

前記第5の発明は、前記第1の発明の熱変色性筆記具において、前記キャップ5が前記筆記具本体2の後端部に装着可能に構成され、前記キャップ5が前記筆記具本体2の後端部に装着された状態において、前記キャップ5の内面が前記摩擦体4の外面に嵌合されるとともに、前記凸部41の後面に前記キャップ5が前後方向に当接されることを要件とする。 The fifth invention is the thermochromic writing instrument of the first invention, wherein the cap 5 is configured to be attachable to a rear end portion of the writing instrument body 2, and the cap 5 is a rear end portion of the writing instrument body 2. It is a condition that the inner surface of the cap 5 is fitted to the outer surface of the friction body 4 and the cap 5 is brought into contact with the rear surface of the convex portion 41 in the front-rear direction in the state of being attached to the.

前記第5の発明の熱変色性筆記具1は、前記キャップ5が前記筆記具本体2の後端部に装着可能に構成され、前記キャップ5が前記筆記具本体2の後端部に装着された状態において、前記キャップ5の内面が前記摩擦体4の外面に嵌合されることにより、キャップ5内面と弾性材料からなる摩擦体4外面とが強固に嵌合され、筆記使用時、筆記具本体2からキャップ5が脱落することを抑止でき、さらに、前記凸部41の後面に前記キャップ5(例えば、キャップ5内壁の当接壁部またはキャップ5開口端)が前後方向に当接されるため、摩擦体4がキャップ5内部に深く挿入されて摩擦体4外面がキャップ5内面により損傷することを回避できる。 In the thermochromic writing instrument 1 of the fifth invention, the cap 5 is configured to be attachable to the rear end of the writing instrument body 2, and the cap 5 is attached to the rear end of the writing instrument body 2. By fitting the inner surface of the cap 5 to the outer surface of the friction body 4, the inner surface of the cap 5 and the outer surface of the friction body 4 made of an elastic material are firmly fitted to each other. 5 can be prevented from falling off, and further, the cap 5 (for example, the contact wall portion of the inner wall of the cap 5 or the opening end of the cap 5) is brought into contact with the rear surface of the convex portion 41 in the front-rear direction. It is possible to prevent the outer surface of the friction body 4 from being damaged by the inner surface of the cap 5 by deeply inserting the inner surface of the cap 5 into the cap 5.

・凸部
本発明(第1乃至第5の発明)において、前記凸部41を含む摩擦体4の横断面形状は、非円形状である。前記凸部41は、単一、または複数個(例えば、2個〜6個)が設けられる。前記凸部41は、前記軸筒3の後端部外面より径方向外方に突出される構成が好ましい。
-Convex portion In the present invention (first to fifth inventions), the cross-sectional shape of the friction body 4 including the convex portion 41 is a non-circular shape. The convex portion 41 is provided in a single number or a plurality (for example, 2 to 6). It is preferable that the convex portion 41 projects radially outward from the outer surface of the rear end portion of the barrel 3.

・摩擦体の材料
本発明(第1乃至第5の発明)において、前記摩擦体4は、例えば、弾性を有する合成樹脂(ゴム、エラストマー)が挙げられ、例えば、シリコーン樹脂、SBS樹脂(スチレン−ブタジエン−スチレン共重合体)、SEBS樹脂(スチレン−エチレン−ブタジエン−スチレン共重合体)、フッ素系樹脂、クロロプレン樹脂、ニトリル樹脂、ポリエステル系樹脂、オレフィン系樹脂、エチレンプロピレンジエンゴム(EPDM)等が挙げられ、特に、高摩耗性の弾性材料(例えば、消しゴム等)からなるものよりも、摩擦時に摩耗屑が生じない低摩耗性の弾性材料からなることが好ましい。
-Material of Friction Body In the present invention (first to fifth inventions), examples of the friction body 4 include elastic synthetic resins (rubber, elastomer), such as silicone resin and SBS resin (styrene-). Butadiene-styrene copolymer), SEBS resin (styrene-ethylene-butadiene-styrene copolymer), fluorine resin, chloroprene resin, nitrile resin, polyester resin, olefin resin, ethylene propylene diene rubber (EPDM), etc. In particular, it is preferable to use an elastic material having low wear resistance that does not generate abrasion debris during friction, rather than an elastic material having high wear resistance (for example, eraser).

・軸筒及びキャップの材料
本発明(第1乃至第5の発明)において、前記軸筒3及び前記キャップ5を構成する材料は、例えば、ポリプロピレン、ポリエチレン、ポリカーボネート、ポリエチレンテレフタレート、ポリアセタール、アクリル、ナイロン、アクリルニトリル・スチレン共重合樹脂(AS樹脂)、アクリルニトリル・ブタジエン・スチレン共重合樹脂(ABS樹脂)等の合成樹脂、またはステンレス鋼、アルミニウム合金、黄銅等の金属が挙げられる。
-Material of barrel and cap In the present invention (first to fifth inventions), the material constituting the barrel 3 and the cap 5 is, for example, polypropylene, polyethylene, polycarbonate, polyethylene terephthalate, polyacetal, acrylic, nylon. Examples thereof include synthetic resins such as acrylonitrile/styrene copolymer resin (AS resin) and acrylonitrile/butadiene/styrene copolymer resin (ABS resin), and metals such as stainless steel, aluminum alloy, and brass.

・熱変色性インキ
本発明(第1乃至第5の発明)における熱変色性インキは、熱変色性マイクロカプセル顔料を用いたものであり、(イ)電子供与性呈色性有機化合物、(ロ)電子受容性化合物、(ハ)前記両者の呈色反応の生起温度を決める反応媒体からなる可逆熱変色性組成物を内包させた可逆熱変色性マイクロカプセル顔料を含む水性インキ組成物が採用される。前記熱変色性インキは、加熱により消色するタイプ、または加熱により発色するタイプが挙げられる。さらに、前記可逆熱変色性マイクロカプセル顔料中、或いはインキ中には、非熱変色性の染料、顔料等の着色剤を配合して、有色(1)から有色(2)への互変的色変化を呈する構成とすることもできる。前記染料としては、酸性染料、塩基性染料、直接染料、蛍光染料が全て使用可能である。また、顔料としては、カーボンブラック、群青、二酸化チタン顔料等の無機顔料、アゾ系顔料、フタロシアニン系顔料、インジゴ顔料、チオインジゴ顔料、スレン顔料、キナクリドン系顔料、アントラキノン系顔料、スロン系顔料、ジケトピロロピロール系顔料、ジオキサジン系顔料、ペリレン系顔料、ペリノン系顔料、イソインドリノン系顔料等の有機顔料や蛍光顔料を例示できる。
Thermochromic Ink The thermochromic ink in the present invention (first to fifth inventions) uses a thermochromic microcapsule pigment, and (b) an electron-donating color-developing organic compound; ) An electron-accepting compound, and (c) an aqueous ink composition containing a reversible thermochromic microcapsule pigment containing a reversible thermochromic composition composed of a reaction medium that determines the temperature at which the above-mentioned color reaction occurs. It The thermochromic ink may be of a type that is decolorized by heating or a type that is colored by heating. Further, a colorant such as a non-thermochromic dye or pigment is mixed in the reversible thermochromic microcapsule pigment or the ink to provide an alternating color from colored (1) to colored (2). It is also possible to adopt a configuration that exhibits a change. As the dye, an acid dye, a basic dye, a direct dye, and a fluorescent dye can all be used. As the pigment, carbon black, ultramarine blue, inorganic pigment such as titanium dioxide pigment, azo pigment, phthalocyanine pigment, indigo pigment, thioindigo pigment, slene pigment, quinacridone pigment, anthraquinone pigment, throne pigment, diketo. Examples include pyrrolopyrrole pigments, dioxazine pigments, perylene pigments, perinone pigments, isoindolinone pigments, and other organic pigments and fluorescent pigments.

・ペン先
本発明(第1乃至第5の発明)におけるペン先31は、前端に回転可能にボールが抱持されたボールペンチップ、多孔質ペン体(例えば、繊維加工体、連続気泡発泡体)または軸方向のインキ誘導路を有する合成樹脂押出成形体よりなるペン体、または毛筆ペン先等が挙げられる。
-Pen tip The pen tip 31 in the present invention (first to fifth inventions) is a ball-point pen tip having a ball rotatably held at the front end, a porous pen body (for example, a fiber processed body, an open-cell foam body). Alternatively, a pen body made of a synthetic resin extruded product having an ink guide path in the axial direction, a writing pen tip, or the like may be used.

本発明の熱変色性筆記具は、摩擦体の外面に径方向外方に突出する転がり防止用の凸部が一体に設けられることにより、キャップを外した状態で、筆記具本体を安定して机上に置くことができ、さらに、傾斜した机上でも筆記具本体が滑り落ちることを防止できる。 The thermochromic writing instrument of the present invention is provided with a convex portion for rolling prevention that projects radially outward on the outer surface of the friction body, so that the writing instrument body can be stably placed on a desk with the cap removed. It can be placed and can prevent the writing instrument body from slipping down even on an inclined desk.

本発明の第1の実施の形態の一部縦断面図であり、筆記具本体のペン先側にキャップを装着した状態を示す。It is a partial longitudinal cross-sectional view of the first embodiment of the present invention, showing a state in which a cap is attached to the pen tip side of the writing instrument main body. 図1の筆記具本体の後端部にキャップを装着した状態を示す。The state which attached the cap to the rear end part of the writing instrument main body of FIG. 1 is shown. 本発明の第2の実施の形態の一部縦断面図であり、筆記具本体のペン先側にキャップを装着した状態を示す。It is a partial longitudinal cross-sectional view of the 2nd Embodiment of this invention, and shows the state which attached the cap to the pen tip side of the writing instrument main body. 図3の筆記具本体の後端部にキャップを装着した状態を示す。The state which attached the cap to the rear end part of the writing instrument main body of FIG. 3 is shown. 本発明の第3の実施の形態の一部縦断面図であり、筆記具本体のペン先側にキャップを装着した状態を示す一部縦断面図である。It is a partial longitudinal cross-sectional view of the 3rd Embodiment of this invention, Comprising: It is a partial longitudinal cross-sectional view which shows the state which attached the cap to the pen tip side of the writing instrument main body. 図5の筆記具本体の後端部にキャップを装着した状態を示す。The state which attached the cap to the rear end part of the writing instrument main body of FIG. 5 is shown.

<第1の実施の形態>
本発明の第1の実施の形態を図1及び図2に示す。
本実施の形態の熱変色性筆記具1は、筆記具本体2と、筆記具本体2のペン先側及び反ペン先側に装着可能なキャップ5とを備える。筆記具本体2は、内部に熱変色性インキが収容された軸筒3と、該軸筒3の前端に設けられたペン先31と、軸筒3の後端に設けられた摩擦体4とを備える。ペン先31から、軸筒3内部の熱変色性インキが吐出可能である。熱変色性インキは、摩擦体4による摩擦熱により有色から異なる有色(例えば黒色からピンク色)に変化するもの、または、有色(例えば黒色)から無色に変化するものが挙げられる。
<First Embodiment>
A first embodiment of the present invention is shown in FIGS.
The thermochromic writing instrument 1 of the present embodiment includes a writing instrument body 2 and a cap 5 that can be attached to the pen tip side and the non-pen tip side of the writing instrument body 2. The writing instrument body 2 includes a barrel 3 in which the thermochromic ink is stored, a pen tip 31 provided at the front end of the barrel 3, and a friction body 4 provided at the rear end of the barrel 3. Prepare The thermochromic ink inside the barrel 3 can be ejected from the pen tip 31. Examples of the thermochromic ink include those that change from colored to different colors (for example, black to pink) or those that change from colored (for example, black) to colorless due to frictional heat from the friction body 4.

・摩擦体
摩擦体4は軸筒3後端に圧入嵌合または2色成形により固定される。摩擦体4は、弾性材料よりなり、後端に向かうに従い外径が小さくなる先細円柱状の側面と、該側面より径方向外方に突出された1個または複数個の凸部41と、凸曲面状の後端面とが一体に形成される。凸部41は軸方向に延びる突条により形成される。
Friction body The friction body 4 is fixed to the rear end of the barrel 3 by press fitting or two-color molding. The friction body 4 is made of an elastic material and has a tapered cylindrical side surface whose outer diameter decreases toward the rear end, and one or a plurality of convex portions 41 projecting radially outward from the side surface. The curved rear end face is integrally formed. The convex portion 41 is formed by a ridge extending in the axial direction.

摩擦体4の材料は、例えば、シリコーン樹脂、SBS樹脂(スチレン−ブタジエン−スチレン共重合体)、SEBS樹脂(スチレン−エチレン−ブタジエン−スチレン共重合体)が採用される。摩擦体4により、ペン先31により紙面上に形成された熱変色性インキの筆跡を摩擦してその際の発生する摩擦熱で熱変色性インキの筆跡を熱変色させることができる。 As the material of the friction body 4, for example, silicone resin, SBS resin (styrene-butadiene-styrene copolymer), SEBS resin (styrene-ethylene-butadiene-styrene copolymer) are adopted. By the friction body 4, it is possible to rub the handwriting of the thermochromic ink formed on the paper surface by the pen tip 31 and to thermally discolor the handwriting of the thermochromic ink by frictional heat generated at that time.

・軸筒
軸筒3は円筒体であり、後端に向かうに従い外径が次第に小さくなる先細状に形成される。軸筒3の外面に沿って後方に延びる仮想延長線上より凸部41が径方向外方に突出される。
キャップ5を筆記具本体2から外した状態において、筆記具本体2を平面状の机上に載置した際、摩擦体4の側面が凸部41以外部分では机上に非接触状態となるが、摩擦体4の側面が凸部41により机上に接触し、机上での筆記具本体2の転がりが防止される。
-Shaft cylinder The shaft cylinder 3 is a cylindrical body, and is formed in a tapered shape whose outer diameter gradually decreases toward the rear end. The convex portion 41 is projected outward in the radial direction from a virtual extension line extending rearward along the outer surface of the barrel 3.
When the writing instrument body 2 is placed on a flat desk with the cap 5 removed from the writing instrument body 2, the side surface of the friction body 4 is in a non-contact state on the desk except the convex portion 41. The side face of the writing instrument body 2 comes into contact with the desk due to the convex portion 41, and the rolling of the writing instrument body 2 on the desk is prevented.

・キャップ
キャップ5は、一端が開口され且つ他端が閉鎖された有底筒状体からなる。キャップ5の外面にはクリップが一体または別部材の取り付けにより設けられる。キャップ5は合成樹脂または金属により形成される。
-Cap The cap 5 is made of a bottomed cylindrical body having one end opened and the other end closed. A clip is provided on the outer surface of the cap 5 integrally or by attaching a separate member. The cap 5 is made of synthetic resin or metal.

図2に示すように、キャップ5は筆記具本体2の後端部外面に装着可能である。キャップ5が筆記具本体2の後端部外面に装着された状態において、キャップ5の内面が軸筒3の後部外面に嵌合され、摩擦体4がキャップ5内部に位置される。キャップ5内面が嵌合される軸筒3外面の嵌合部21の外径は、凸部41を含む摩擦体4の最大外径(凸部41の頂点に接する摩擦体4の外接円の直径の最大値)より大きく設定される。 As shown in FIG. 2, the cap 5 can be attached to the outer surface of the rear end of the writing instrument body 2. With the cap 5 mounted on the outer surface of the rear end portion of the writing instrument body 2, the inner surface of the cap 5 is fitted to the outer surface of the rear portion of the barrel 3 and the friction body 4 is positioned inside the cap 5. The outer diameter of the fitting portion 21 on the outer surface of the barrel 3 into which the inner surface of the cap 5 is fitted is the maximum outer diameter of the friction body 4 including the convex portion 41 (the diameter of the circumscribing circle of the friction body 4 in contact with the apex of the convex portion 41). The maximum value of) is set.

本実施の形態の熱変色性筆記具1は、弾性材料よりなる摩擦体4の外面に径方向外方に突出する転がり防止用の凸部41が一体に設けられることにより、キャップ5を外した状態で、筆記具本体2を安定して机上に置くことができ、さらに、傾斜した机上でも筆記具本体2が滑り落ちることを防止できる。また、本実施の形態の熱変色性筆記具1は、軸筒2の外面に転がり防止用の凸部を設けないため、軸筒2の外面に転写印刷等の加飾が容易となる。 The thermochromic writing instrument 1 of the present embodiment is in a state in which the cap 5 is removed by integrally providing the rolling prevention convex portion 41 protruding outward in the radial direction on the outer surface of the friction body 4 made of an elastic material. Thus, the writing instrument main body 2 can be stably placed on the desk, and further, the writing instrument main body 2 can be prevented from sliding down even on an inclined desk. Moreover, since the thermochromic writing instrument 1 of the present embodiment does not have the convex portion for rolling prevention provided on the outer surface of the barrel 2, the outer surface of the barrel 2 can be easily decorated by transfer printing or the like.

本実施の形態の熱変色性筆記具1は、キャップ5が筆記具本体2の後端部に装着可能に構成され、キャップ5が筆記具本体2の後端部に装着された状態において、キャップ5内に凸部41が位置されることにより、筆記使用時のキャップ5の紛失を回避でき、また、キャップ5が筆記具本体2の後端部に装着された状態において、筆記具全体の長手寸法が長くなることを抑止し、筆記使用時の筆記具の安定した把持が可能となる。 The thermochromic writing instrument 1 of the present embodiment is configured such that the cap 5 is attachable to the rear end portion of the writing instrument body 2, and the cap 5 is attached to the inside of the cap 5 when the cap 5 is attached to the rear end portion of the writing instrument body 2. By positioning the convex portion 41, it is possible to avoid the loss of the cap 5 when using for writing, and the longitudinal dimension of the entire writing instrument becomes long when the cap 5 is attached to the rear end of the writing instrument body 2. It is possible to hold the writing implement in a stable manner when the writing is used.

本実施の形態の熱変色性筆記具1は、筆記具本体2の後端部にキャップ5が装着された際、キャップ5の内面が凸部41より前方の軸筒3の外面に嵌合され、キャップ5の内面が嵌合される軸筒3の外面の嵌合部21の外径が、凸部41を含む摩擦体4の外径より大きいことにより、キャップ5を筆記具本体2の後端部に装着する際、凸部41にキャップ5開口端を当てることなく、キャップ5を筆記具本体2後端部に円滑に装着することができる。 In the thermochromic writing instrument 1 of the present embodiment, when the cap 5 is attached to the rear end of the writing instrument body 2, the inner surface of the cap 5 is fitted to the outer surface of the barrel 3 in front of the convex portion 41, Since the outer diameter of the fitting portion 21 on the outer surface of the shaft tube 3 into which the inner surface of 5 is fitted is larger than the outer diameter of the friction body 4 including the convex portion 41, the cap 5 is attached to the rear end portion of the writing instrument body 2. When attaching, the cap 5 can be smoothly attached to the rear end of the writing instrument body 2 without touching the opening end of the cap 5 to the convex portion 41.

<第2の実施の形態>
本発明の第2の実施の形態を図3及び図4に示す。
本実施の形態の熱変色性筆記具1は、筆記具本体2と、筆記具本体2のペン先側及び反ペン先側に装着可能なキャップ5とを備える。筆記具本体2は、内部に熱変色性インキが収容された軸筒3と、該軸筒3の前端に設けられたペン先31と、軸筒3の後端に設けられた摩擦体4とを備える。ペン先31から、軸筒3内部の熱変色性インキが吐出可能である。熱変色性インキは、摩擦体4による摩擦熱により有色から異なる有色(例えば黒色からピンク色)に変化するもの、または、有色(例えば青色)から無色に変化するものが挙げられる。
<Second Embodiment>
The second embodiment of the present invention is shown in FIGS.
The thermochromic writing instrument 1 of the present embodiment includes a writing instrument body 2 and a cap 5 that can be attached to the pen tip side and the non-pen tip side of the writing instrument body 2. The writing instrument body 2 includes a barrel 3 in which the thermochromic ink is stored, a pen tip 31 provided at the front end of the barrel 3, and a friction body 4 provided at the rear end of the barrel 3. Prepare The thermochromic ink inside the barrel 3 can be ejected from the pen tip 31. Examples of the thermochromic ink include those that change from colored to different colors (for example, black to pink) or those that change from colored (for example, blue) to colorless due to frictional heat from the friction body 4.

・摩擦体
摩擦体4は軸筒3後端に圧入嵌合または2色成形により固定される。摩擦体4は、弾性材料よりなり、後端に向かうに従い外径が小さくなる先細円柱状の側面と、該側面より径方向外方に突出された複数個(例えば4個)の凸部41と、凸曲面状の後端面とが一体に形成される。凸部41は、摩擦体4の側面の前端部の外周面に等間隔に形成される。凸部41は軸方向に延びる突条により形成される。
Friction body The friction body 4 is fixed to the rear end of the barrel 3 by press fitting or two-color molding. The friction body 4 is made of an elastic material, and has a tapered cylindrical side surface whose outer diameter decreases toward the rear end, and a plurality of (for example, four) convex portions 41 protruding radially outward from the side surface. , And the convex curved rear end surface are integrally formed. The convex portions 41 are formed at equal intervals on the outer peripheral surface of the front end portion of the side surface of the friction body 4. The convex portion 41 is formed by a ridge extending in the axial direction.

摩擦体4の材料は、例えば、シリコーン樹脂、SBS樹脂(スチレン−ブタジエン−スチレン共重合体)、SEBS樹脂(スチレン−エチレン−ブタジエン−スチレン共重合体)が採用される。摩擦体4により、ペン先31により紙面上に形成された熱変色性インキの筆跡を摩擦してその際の発生する摩擦熱で熱変色性インキの筆跡を熱変色させることができる。 As the material of the friction body 4, for example, silicone resin, SBS resin (styrene-butadiene-styrene copolymer), SEBS resin (styrene-ethylene-butadiene-styrene copolymer) are adopted. By the friction body 4, it is possible to rub the handwriting of the thermochromic ink formed on the paper surface by the pen tip 31 and to thermally discolor the handwriting of the thermochromic ink by frictional heat generated at that time.

・軸筒
軸筒3は円筒体であり、後端に向かうに従い外径が次第に小さくなる先細状に形成される。軸筒3の外面に沿って後方に延びる仮想延長線上より凸部41が径方向外方に突出される。
キャップ5を筆記具本体2から外した状態において、筆記具本体2を平面状の机上に載置した際、摩擦体4の側面が凸部41により机上に接触し、机上での筆記具本体2の転がりが防止される。
-Shaft cylinder The shaft cylinder 3 is a cylindrical body, and is formed in a tapered shape whose outer diameter gradually decreases toward the rear end. The convex portion 41 is projected outward in the radial direction from a virtual extension line extending rearward along the outer surface of the barrel 3.
When the writing instrument body 2 is placed on a flat desk with the cap 5 removed from the writing instrument body 2, the side surface of the friction body 4 comes into contact with the desk due to the convex portion 41, and the writing instrument body 2 rolls on the desk. To be prevented.

・キャップ
キャップ5は、一端が開口され且つ他端が閉鎖された有底筒状体からなる。キャップ5の外面にはクリップが一体または別部材の取り付けにより設けられる。キャップ5は合成樹脂または金属により形成される。
-Cap The cap 5 is made of a bottomed cylindrical body having one end opened and the other end closed. A clip is provided on the outer surface of the cap 5 integrally or by attaching a separate member. The cap 5 is made of synthetic resin or metal.

図4に示すように、キャップ5は筆記具本体2の後端部外面に装着可能である。
キャップ5が筆記具本体2の後端部外面に装着された状態において、キャップ5の内面が摩擦体4の外面の嵌合部21(即ち凸部41の径方向外面)に嵌合されるとともに、凸部41の後面にキャップ5内面の当接壁部52(段部)が前後方向に当接される。キャップ5が筆記具本体2の後端部外面に装着された状態において、摩擦体4がキャップ5内部に位置される。
As shown in FIG. 4, the cap 5 can be attached to the outer surface of the rear end of the writing instrument body 2.
While the cap 5 is attached to the outer surface of the rear end portion of the writing instrument body 2, the inner surface of the cap 5 is fitted to the fitting portion 21 (that is, the outer surface in the radial direction of the convex portion 41) of the outer surface of the friction body 4, and The contact wall portion 52 (step portion) on the inner surface of the cap 5 is brought into contact with the rear surface of the convex portion 41 in the front-rear direction. The friction body 4 is positioned inside the cap 5 in a state where the cap 5 is attached to the outer surface of the rear end portion of the writing instrument body 2.

本実施の形態の熱変色性筆記具1は、弾性材料よりなる摩擦体4の外面に径方向外方に突出する転がり防止用の凸部41が一体に設けられることにより、キャップ5を外した状態で、筆記具本体2を安定して机上に置くことができ、さらに、傾斜した机上でも筆記具本体2が滑り落ちることを防止できる。また、本実施の形態の熱変色性筆記具1は、軸筒2の外面に転がり防止用の凸部を設けないため、軸筒2の外面に転写印刷等の加飾が容易となる。 The thermochromic writing instrument 1 of the present embodiment is in a state in which the cap 5 is removed by integrally providing the rolling prevention convex portion 41 protruding outward in the radial direction on the outer surface of the friction body 4 made of an elastic material. Thus, the writing instrument main body 2 can be stably placed on the desk, and further, the writing instrument main body 2 can be prevented from sliding down even on an inclined desk. Moreover, since the thermochromic writing instrument 1 of the present embodiment does not have the convex portion for rolling prevention provided on the outer surface of the barrel 2, the outer surface of the barrel 2 can be easily decorated by transfer printing or the like.

本実施の形態の熱変色性筆記具1は、キャップ5が筆記具本体2の後端部に装着可能に構成され、キャップ5が筆記具本体2の後端部に装着された状態において、キャップ5内に凸部41が位置されることにより、筆記使用時のキャップ5の紛失を回避でき、また、キャップ5が筆記具本体2の後端部に装着された状態において、筆記具全体の長手寸法が長くなることを抑止し、筆記使用時の筆記具の安定した把持が可能となる。 The thermochromic writing instrument 1 of the present embodiment is configured such that the cap 5 is attachable to the rear end portion of the writing instrument body 2, and the cap 5 is attached to the inside of the cap 5 when the cap 5 is attached to the rear end portion of the writing instrument body 2. By positioning the convex portion 41, it is possible to avoid the loss of the cap 5 when using for writing, and the longitudinal dimension of the entire writing instrument becomes long when the cap 5 is attached to the rear end of the writing instrument body 2. It is possible to hold the writing implement in a stable manner when the writing is used.

本実施の形態の熱変色性筆記具1は、キャップ5が筆記具本体2の後端部に装着可能に構成され、キャップ5が筆記具本体2の後端部に装着された状態において、キャップ5の内面が摩擦体4の外面に嵌合されることにより、キャップ5内面と弾性材料からなる摩擦体4外面とが強固に嵌合され、筆記使用時、筆記具本体2からキャップ5が脱落することを抑止でき、さらに、凸部41の後面にキャップ5(キャップ5内壁の当接壁部52)が前後方向に当接されるため、摩擦体4がキャップ5内部に深く挿入されて摩擦体4外面がキャップ5内面により損傷することを回避できる。 The thermochromic writing instrument 1 of the present embodiment is configured such that the cap 5 is attachable to the rear end of the writing instrument body 2, and the inner surface of the cap 5 is in a state where the cap 5 is attached to the rear end of the writing instrument body 2. Is fitted to the outer surface of the friction body 4, the inner surface of the cap 5 and the outer surface of the friction body 4 made of an elastic material are firmly fitted to each other, and the cap 5 is prevented from falling off the writing instrument body 2 during writing. Further, since the cap 5 (the contact wall portion 52 of the inner wall of the cap 5) is brought into contact with the rear surface of the convex portion 41 in the front-rear direction, the friction body 4 is deeply inserted into the cap 5 and the outer surface of the friction body 4 is Damage to the inner surface of the cap 5 can be avoided.

<第3の実施の形態>
本発明の第3の実施の形態を図5及び図6に示す。
本実施の形態の熱変色性筆記具1は、筆記具本体2と、筆記具本体2のペン先側及び反ペン先側に装着可能なキャップ5とを備える。筆記具本体2は、内部に熱変色性インキが収容された軸筒3と、該軸筒3の前端に設けられたペン先31と、軸筒3の後端に設けられた摩擦体4とを備える。ペン先31から、軸筒3内部の熱変色性インキが吐出可能である。熱変色性インキは、摩擦体4による摩擦熱により有色から異なる有色(例えば黒色からピンク色)に変化するもの、または、有色(例えば赤色)から無色に変化するものが挙げられる。
<Third Embodiment>
A third embodiment of the present invention is shown in FIGS.
The thermochromic writing instrument 1 of the present embodiment includes a writing instrument body 2 and a cap 5 that can be attached to the pen tip side and the non-pen tip side of the writing instrument body 2. The writing instrument body 2 includes a barrel 3 in which the thermochromic ink is stored, a pen tip 31 provided at the front end of the barrel 3, and a friction body 4 provided at the rear end of the barrel 3. Prepare The thermochromic ink inside the barrel 3 can be ejected from the pen tip 31. Examples of the thermochromic ink include those that change from colored to different colors (for example, black to pink) or those that change from colored (for example, red) to colorless due to frictional heat from the friction body 4.

・摩擦体
摩擦体4は軸筒3後端に圧入嵌合または2色成形により固定される。摩擦体4は、弾性材料よりなり、円柱状の第1の側面と、第1の側面42より段部を介して前方に延設され且つ第1の側面42より大きい外径を有する第2の側面43と、該第2の側面43より径方向外方に突出された1個または複数個の凸部41と、凸曲面状の後端面とが一体に形成される。凸部41より後方の第2の側面43に、キャップ5内面が嵌合可能な嵌合部21が形成される。キャップ5を筆記具本体2の後端部に装着した際、凸部41の後面にキャップ5の開口端が当接される。凸部4は半球状に形成される。
Friction body The friction body 4 is fixed to the rear end of the barrel 3 by press fitting or two-color molding. The friction body 4 is made of an elastic material, and has a cylindrical first side surface, and a second side surface extending forward from the first side surface 42 via a step portion and having an outer diameter larger than that of the first side surface 42. The side surface 43, one or a plurality of convex portions 41 projecting radially outward from the second side surface 43, and a convex curved rear end surface are integrally formed. A fitting portion 21 into which the inner surface of the cap 5 can be fitted is formed on the second side surface 43 rearward of the convex portion 41. When the cap 5 is attached to the rear end of the writing instrument body 2, the open end of the cap 5 contacts the rear surface of the convex portion 41. The convex portion 4 is formed in a hemispherical shape.

摩擦体4の材料は、例えば、シリコーン樹脂、SBS樹脂(スチレン−ブタジエン−スチレン共重合体)、SEBS樹脂(スチレン−エチレン−ブタジエン−スチレン共重合体)が採用される。摩擦体4により、ペン先31により紙面上に形成された熱変色性インキの筆跡を摩擦してその際の発生する摩擦熱で熱変色性インキの筆跡を熱変色させることができる。 As the material of the friction body 4, for example, silicone resin, SBS resin (styrene-butadiene-styrene copolymer), SEBS resin (styrene-ethylene-butadiene-styrene copolymer) are adopted. The friction body 4 rubs the handwriting of the thermochromic ink formed on the surface of the paper by the pen tip 31, and the frictional heat generated at that time can thermally discolor the handwriting of the thermochromic ink.

・軸筒
軸筒3は円筒体であり、後端に向かうに従い外径が次第に小さくなる先細状に形成される。軸筒3の外面に沿って後方に延びる仮想延長線上より凸部41が径方向外方に突出される。
キャップ5を筆記具本体2から外した状態において、筆記具本体2を平面状の机上に載置した際、摩擦体4の側面が凸部41により机上に接触し、机上での筆記具本体2の転がりが防止される。
-Shaft cylinder The shaft cylinder 3 is a cylindrical body, and is formed in a tapered shape whose outer diameter gradually decreases toward the rear end. The convex portion 41 is projected outward in the radial direction from a virtual extension line extending rearward along the outer surface of the barrel 3.
When the writing instrument body 2 is placed on a flat desk with the cap 5 removed from the writing instrument body 2, the side surface of the friction body 4 comes into contact with the desk due to the convex portion 41, and the writing instrument body 2 rolls on the desk. To be prevented.

・キャップ
キャップ5は、一端が開口され且つ他端が閉鎖された有底筒状体からなる。キャップ5の外面にはクリップが一体または別部材の取り付けにより設けられる。キャップ5は合成樹脂または金属により形成される。
-Cap The cap 5 is made of a bottomed cylindrical body having one end opened and the other end closed. A clip is provided on the outer surface of the cap 5 integrally or by attaching a separate member. The cap 5 is made of synthetic resin or metal.

図6に示すように、キャップ5は筆記具本体2の後端部外面に装着可能である。
キャップ5が筆記具本体2の後端部外面に装着された状態において、キャップ5の内面が摩擦体4の嵌合部21(凸部41の後方の外面)に嵌合されるとともに、凸部41の後面にキャップ5の開口端が前後に当接される。キャップ5が筆記具本体2の後端部外面に装着された状態において、摩擦体4の後部がキャップ5内部に位置されるとともに摩擦体4の凸部41がキャップ5の外部に露出される。それにより、凸部41を含む摩擦体4の外径をキャップ5内径より大きく設定することができ、キャップ5を取り外した状態において、筆記具本体2が机上を転がることを確実に防止できる。
As shown in FIG. 6, the cap 5 can be attached to the outer surface of the rear end of the writing instrument body 2.
In a state where the cap 5 is mounted on the outer surface of the rear end portion of the writing instrument body 2, the inner surface of the cap 5 is fitted to the fitting portion 21 of the friction body 4 (the outer surface of the rear portion of the convex portion 41) and the convex portion 41. The open end of the cap 5 is brought into contact with the rear surface in the front and back. With the cap 5 mounted on the outer surface of the rear end of the writing instrument body 2, the rear portion of the friction body 4 is positioned inside the cap 5 and the convex portion 41 of the friction body 4 is exposed to the outside of the cap 5. Thereby, the outer diameter of the friction body 4 including the convex portion 41 can be set to be larger than the inner diameter of the cap 5, and it is possible to reliably prevent the writing instrument main body 2 from rolling on the desk when the cap 5 is removed.

本実施の形態の熱変色性筆記具1は、弾性材料よりなる摩擦体4の外面に径方向外方に突出する転がり防止用の凸部41が一体に設けられることにより、キャップ5を外した状態で、筆記具本体2を安定して机上に置くことができ、さらに、傾斜した机上でも筆記具本体2が滑り落ちることを防止できる。また、本実施の形態の熱変色性筆記具1は、軸筒2の外面に転がり防止用の凸部を設けないため、軸筒2の外面に転写印刷等の加飾が容易となる。 The thermochromic writing instrument 1 of the present embodiment is in a state in which the cap 5 is removed by integrally providing the rolling prevention convex portion 41 protruding outward in the radial direction on the outer surface of the friction body 4 made of an elastic material. Thus, the writing instrument main body 2 can be stably placed on the desk, and further, the writing instrument main body 2 can be prevented from sliding down even on an inclined desk. Further, since the thermochromic writing instrument 1 of the present embodiment does not have the convex portion for rolling prevention provided on the outer surface of the barrel 2, the outer surface of the barrel 2 can be easily decorated by transfer printing or the like.

本実施の形態の熱変色性筆記具1は、キャップ5が筆記具本体2の後端部に装着可能に構成され、キャップ5が筆記具本体2の後端部に装着された状態において、キャップ5の内面が摩擦体4の外面に嵌合されることにより、キャップ5内面と弾性材料からなる摩擦体4外面とが強固に嵌合され、筆記使用時、筆記具本体2からキャップ5が脱落することを抑止でき、さらに、凸部41の後面にキャップ5(キャップ5開口端)が前後方向に当接されるため、摩擦体4がキャップ5内部に深く挿入されて摩擦体4外面がキャップ5内面により損傷することを回避できる。 The thermochromic writing instrument 1 of the present embodiment is configured such that the cap 5 is attachable to the rear end of the writing instrument body 2, and the inner surface of the cap 5 is in a state where the cap 5 is attached to the rear end of the writing instrument body 2. Is fitted to the outer surface of the friction body 4, the inner surface of the cap 5 and the outer surface of the friction body 4 made of an elastic material are firmly fitted to each other, and the cap 5 is prevented from falling off the writing instrument body 2 during writing. Further, since the cap 5 (open end of the cap 5) is brought into contact with the rear surface of the convex portion 41 in the front-back direction, the friction body 4 is deeply inserted into the cap 5 and the outer surface of the friction body 4 is damaged by the inner surface of the cap 5. Can be avoided.

1 熱変色性筆記具
2 筆記具本体
21 嵌合部
3 軸筒
31 ペン先
4 摩擦体
41 凸部
42 第1の側面
43 第2の側面
5 キャップ
51 クリップ
52 当接壁部
DESCRIPTION OF SYMBOLS 1 Thermochromic writing instrument 2 Writing instrument main body 21 Fitting portion 3 Shaft barrel 31 Pen tip 4 Friction body 41 Convex portion 42 First side surface 43 Second side surface 5 Cap 51 Clip 52 Contact wall portion

Claims (5)

筆記具本体と、前記筆記具本体のペン先側外面に着脱自在に設けられるキャップと、を備え、前記筆記具本体が、熱変色性インキを内蔵し且つ前端にペン先が設けられた軸筒と、前記軸筒の後端に設けられ、前記熱変色性インキの筆跡を摩擦しその際に生じる摩擦熱で該筆跡が熱変色可能な弾性材料よりなる摩擦体と、を備えた熱変色性筆記具であって、
前記摩擦体の外面に径方向外方に突出する転がり防止用の凸部が一体に設けられることを特徴とする熱変色性筆記具。
A writing instrument main body; and a cap detachably provided on an outer surface of the writing instrument body on the pen tip side, wherein the writing instrument body contains a thermochromic ink and a barrel provided with a pen tip at the front end, A thermochromic writing instrument, comprising: a friction body, which is provided at the rear end of the barrel and rubs the handwriting of the thermochromic ink, the friction body being made of an elastic material capable of thermochromicing the handwriting by frictional heat generated at that time. hand,
A thermochromic writing instrument, wherein a rolling-preventing convex portion that projects radially outward is integrally provided on the outer surface of the friction body.
前記キャップが前記筆記具本体の後端部に装着可能に構成され、前記キャップが前記筆記具本体の後端部に装着された状態において、前記キャップ内に前記凸部が位置される請求項1記載の熱変色性筆記具。 2. The cap is configured to be attachable to a rear end of the writing instrument main body, and the convex portion is located in the cap when the cap is attached to a rear end of the writing instrument main body. Thermochromic writing instrument. 前記筆記具本体の後端部に前記キャップが装着された状態において、前記キャップの内面が前記凸部より前方の前記軸筒の外面に嵌合され、前記キャップの内面が嵌合される前記軸筒の外面の嵌合部の外径が、前記凸部を含む摩擦体の外径より大きい請求項2記載の熱変色性筆記具。 In the state where the cap is attached to the rear end of the writing instrument main body, the inner surface of the cap is fitted to the outer surface of the barrel in front of the convex portion, and the barrel is fitted to the inner surface of the cap. The thermochromic writing instrument according to claim 2, wherein the outer diameter of the fitting portion on the outer surface is larger than the outer diameter of the friction body including the convex portion. 前記筆記具本体の後端部に前記キャップが装着された状態において、前記キャップの内面が前記摩擦体の外面に嵌合される請求項2記載の熱変色性筆記具。 The thermochromic writing instrument according to claim 2, wherein an inner surface of the cap is fitted to an outer surface of the friction body in a state where the cap is attached to a rear end portion of the writing instrument body. 前記キャップが前記筆記具本体の後端部に装着可能に構成され、前記キャップが前記筆記具本体の後端部に装着された状態において、前記キャップの内面が前記摩擦体の外面に嵌合されるとともに、前記凸部の後面に前記キャップが前後方向に当接される請求項1記載の熱変色性筆記具。 The cap is configured to be attachable to the rear end of the writing instrument body, and the inner surface of the cap is fitted to the outer surface of the friction body in a state where the cap is attached to the rear end of the writing instrument body. The thermochromic writing instrument according to claim 1, wherein the cap is brought into contact with the rear surface of the convex portion in the front-rear direction.
JP2018237501A 2018-12-19 2018-12-19 Thermochromic writing instrument Pending JP2020097208A (en)

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