JP2011079206A - Thermochromic writing utensil - Google Patents

Thermochromic writing utensil Download PDF

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JP2011079206A
JP2011079206A JP2009232846A JP2009232846A JP2011079206A JP 2011079206 A JP2011079206 A JP 2011079206A JP 2009232846 A JP2009232846 A JP 2009232846A JP 2009232846 A JP2009232846 A JP 2009232846A JP 2011079206 A JP2011079206 A JP 2011079206A
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thermochromic
shaft cylinder
rear end
friction body
shaft
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Japanese (ja)
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Hisatsugu Iwata
久嗣 岩田
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Pilot Ink Co Ltd
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Pilot Ink Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a thermochromic writing utensil that can surely intercept ventilation between the inside of a shaft cylinder and the outside of the shaft cylinder in the rear end opening of the shaft cylinder mounted with a friction body. <P>SOLUTION: The rear end of the shaft cylinder 2 is provided with a friction body 5 rubbing against thermochromic handwriting in thermochromic ink to thermally discolor the thermochromic handwriting with frictional heat generated at that time. An engaging protrusion 21 is formed on the rear end opening inner surface of the shaft cylinder 2. An annular inner seal part 22 is provided on the rear end opening inner surface of the shaft cylinder 2 in front of the engaging protrusion 21. The friction body 5 includes a front side bulging part 51 having an annular outer seal part 51a on the outer surface; an engaging recess 53 connected to the rear part of the front side bulging part 51; and a rear side bulging part 52 connected to the rear part of the engaging recess 53. The engaging protrusion 21 is engaged with the engaging recess 53. The rear side bulging part 52 is projected backward from the rear end of the shaft cylinder 2. The outer seal part 51a and the inner seal part 22 are airtightly suitable for each other to intercept ventilation between the inside of the shaft cylinder 2 and the outside of the shaft cylinder 2. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、熱変色性筆記具に関する。詳細には、軸筒の内部に熱変色性インキを収容し、前記軸筒の前端に前記熱変色性インキが吐出可能なペン先を設け、前記軸筒の後端に、前記熱変色性インキによる熱変色性の筆跡を摩擦しその際に生じる摩擦熱で前記熱変色性の筆跡を熱変色させる摩擦体を設けた熱変色性筆記具に関する。 The present invention relates to a thermochromic writing instrument. Specifically, thermochromic ink is accommodated inside the shaft tube, a pen tip capable of discharging the thermochromic ink is provided at the front end of the shaft tube, and the thermochromic ink is disposed at the rear end of the shaft tube. The present invention relates to a thermochromic writing instrument provided with a friction body for rubbing the thermochromic handwriting by rubbing and thermally discoloring the thermochromic handwriting by frictional heat generated at that time.

従来、この種の筆記具において、例えば、特許文献１には、熱変色性の筆跡を摩擦熱により熱変色させる摩擦体を、軸筒の後端に設けた構成が記載されている。前記特許文献１において、筆記具がインキ逆流防止体を備えたゲルインキボールペンの場合、インキ逆流防止体の後方の軸筒内部空間と軸筒外部との通気が必要であり、前記特許文献１の図２には、通気孔を備えた摩擦体によって、軸筒内部と軸筒外部との間の通気を許容する構造が記載されている。 Conventionally, in this type of writing instrument, for example, Patent Document 1 describes a configuration in which a friction body for thermally discoloring a thermochromic handwriting by frictional heat is provided at the rear end of the shaft cylinder. In the above-mentioned Patent Document 1, when the writing instrument is a gel ink ballpoint pen provided with an ink backflow prevention body, ventilation between the shaft cylinder inner space behind the ink backflow prevention body and the outside of the shaft cylinder is necessary. Describes a structure that allows ventilation between the inside of the shaft tube and the outside of the shaft tube by a friction body provided with a vent hole.

特開２００８−１５５６２４号公報JP 2008-155624 A

前記従来の熱変色性筆記具において、軸筒の後端開口部に摩擦体を取り付け、前記軸筒の後端開口部における軸筒内部と軸筒外部との通気を確実に遮断できるものは、未だ提案されていない。 In the conventional thermochromic writing instrument, a friction body is attached to the rear end opening of the shaft tube, and the ventilation between the inner side of the shaft tube and the outside of the shaft tube at the rear end opening of the shaft tube can be reliably blocked. Not proposed.

本発明は、摩擦体を取り付けた軸筒の後端開口部における軸筒内部と軸筒外部との通気を確実に遮断できる熱変色性筆記具を提供しようとするものである。
尚、本発明で、「前」とはペン先側を指し、「後」とはその反対側（摩擦体側）を指す。 An object of the present invention is to provide a thermochromic writing instrument capable of reliably blocking the ventilation between the inside of the shaft tube and the outside of the shaft tube at the rear end opening of the shaft tube to which the friction body is attached.
In the present invention, “front” refers to the pen tip side, and “rear” refers to the opposite side (friction body side).

＜１＞本願の第１の発明は、軸筒２の内部に熱変色性インキを収容し、前記軸筒２の前端に前記熱変色性インキが吐出可能なペン先４を備え、前記軸筒２の後端に、前記熱変色性インキによる熱変色性の筆跡を摩擦しその際に生じる摩擦熱で前記熱変色性の筆跡を熱変色させる摩擦体５を設けた熱変色性筆記具であって、軸筒２の後端開口部内面に係合凸部２１を形成し、前記係合凸部２１よりも前方の軸筒２の後端開口部内面に環状の内側シール部２２を設け、摩擦体５が、外面に環状の外側シール部５１ａを有する前側膨出部５１と、該前側膨出部５１の後方に連設される係合凹部５３と、該係合凹部５３の後方に連設される後側膨出部５２とからなり、係合凸部２１と係合凹部５３とを係合させ、後側膨出部５２を軸筒２の後端より後方に突出させ、外側シール部５１ａと内側シール部２２とを気密嵌合させることにより、軸筒２の後端開口部における軸筒２内部と軸筒２外部との間の通気を遮断することを要件とする。 <1> A first invention of the present application includes a pen tip 4 that accommodates thermochromic ink in a shaft tube 2 and can discharge the thermochromic ink at a front end of the shaft tube 2. 2 is a thermochromic writing instrument provided with a friction body 5 for rubbing the thermochromic handwriting by the thermochromic ink at the rear end of the base plate 2 and rubbing the thermochromic handwriting with frictional heat generated at that time. An engagement convex portion 21 is formed on the inner surface of the rear end opening of the shaft cylinder 2, and an annular inner seal portion 22 is provided on the inner surface of the rear end opening portion of the shaft cylinder 2 in front of the engagement convex portion 21. The body 5 includes a front bulging portion 51 having an annular outer seal portion 51 a on the outer surface, an engaging recess 53 provided continuously behind the front bulging portion 51, and a rear side of the engaging recess 53. The rear bulging portion 52 is engaged with the engaging convex portion 21 and the engaging concave portion 53 so that the rear bulging portion 52 is located behind the rear end of the shaft tube 2. And the outer seal portion 51a and the inner seal portion 22 are hermetically fitted to block the ventilation between the inside of the shaft tube 2 and the outside of the shaft tube 2 at the rear end opening of the shaft tube 2. As a requirement.

前記第１の発明の熱変色性筆記具１は、外側シール部５１ａと内側シール部２２とを気密嵌合させることにより、摩擦体５を取り付けた軸筒２の後端開口部における軸筒２内部と軸筒２外部との通気を確実に遮断できる。また、前記第１の発明の熱変色性筆記具１は、摩擦体５によって直接、軸筒２の後端開口部を密封し、軸筒２の後端開口部を介する軸筒２内部と軸筒２外部との間の通気を遮断する構成のため、部品点数の増加を抑えることができる。 In the thermochromic writing instrument 1 of the first invention, the inner side of the shaft cylinder 2 at the rear end opening of the shaft cylinder 2 to which the friction body 5 is attached is formed by airtightly fitting the outer seal portion 51a and the inner seal portion 22. And the outside of the shaft cylinder 2 can be reliably blocked. In the thermochromic writing instrument 1 of the first invention, the rear end opening of the shaft tube 2 is directly sealed by the friction body 5, and the inside of the shaft tube 2 and the shaft tube through the rear end opening of the shaft tube 2 are sealed. 2 Because of the configuration that blocks ventilation between the outside, an increase in the number of parts can be suppressed.

＜２＞本願の第２の発明は、前記第１の発明の熱変色性筆記具１において、後側膨出部５２の最大外径が内側シール部２２の内径より小さく設定され、摩擦体５の後側膨出部５２が係合凸部２１を前方から後方に乗り越えることにより、係合凸部２１と係合凹部５３とを係合させることを要件とする。 <2> According to a second invention of the present application, in the thermochromic writing instrument 1 of the first invention, the maximum outer diameter of the rear bulge portion 52 is set smaller than the inner diameter of the inner seal portion 22, It is a requirement that the rear bulging portion 52 engages the engaging convex portion 21 and the engaging concave portion 53 by moving over the engaging convex portion 21 from the front to the rear.

前記第２の発明の熱変色性筆記具１は、前記構成により、摩擦体５の挿入組立が容易となる。 The thermochromic writing instrument 1 according to the second aspect of the invention makes it easy to insert and assemble the friction body 5 due to the above configuration.

＜３＞本願の第３の発明は、前記第１または２の発明の熱変色性筆記具１において、摩擦体５の前側膨出部５１の後端部外径が係合凸部２１の内径よりも大きく、且つ、摩擦体５の後側膨出部５２の前端部外径が係合凸部２１の内径よりも大きいことを要件とする。 <3> The third invention of the present application is that, in the thermochromic writing instrument 1 of the first or second invention, the outer diameter of the rear end portion 51 of the friction body 5 is larger than the inner diameter of the engaging convex portion 21. And the outer diameter of the front end portion of the rear bulge portion 52 of the friction body 5 is larger than the inner diameter of the engaging convex portion 21.

前記第３の発明の熱変色性筆記具１は、前記構成により、後側膨出部５２の前端部と係合凸部２１との当接により摩擦体５の前方への移動（即ち摩擦体５の軸筒２内部への埋没）が防止され、前側膨出部５１の後端部と係合凸部２１との当接により摩擦体５の後方への移動（即ち摩擦体５の外部への脱落）が防止される。即ち、前記第３の発明の熱変色性筆記具は、摩擦体５の前後の移動が確実に防止され、摩擦体５の強固な取付状態を維持できる。 In the thermochromic writing instrument 1 according to the third aspect of the present invention, the friction body 5 moves forward (i.e., the friction body 5) by the contact between the front end portion of the rear bulge portion 52 and the engagement convex portion 21. Is buried in the shaft cylinder 2, and the rear end portion of the front-side bulged portion 51 and the engagement convex portion 21 abut against the rearward movement of the friction body 5 (that is, to the outside of the friction body 5). Omission) is prevented. That is, the thermochromic writing instrument according to the third aspect of the present invention can reliably prevent the friction body 5 from moving back and forth, and can maintain a firm attachment state of the friction body 5.

本発明の熱変色性筆記具は、摩擦体を取り付けた軸筒の後端開口部における軸筒内部と軸筒外部との通気を確実に遮断できる。 The thermochromic writing instrument of the present invention can reliably block ventilation between the inside of the shaft tube and the outside of the shaft tube at the rear end opening of the shaft tube to which the friction body is attached.

本発明の実施の形態の縦断面図である。It is a longitudinal section of an embodiment of the invention. 図１の要部拡大図である。It is a principal part enlarged view of FIG. 図１の摩擦体の取付過程を示す要部拡大図である。It is a principal part enlarged view which shows the attachment process of the friction body of FIG.

本発明の第１の実施の形態を説明する（図１乃至図３参照）。 A first embodiment of the present invention will be described (see FIGS. 1 to 3).

本実施の形態の熱変色性筆記具１は、軸筒２と、該軸筒２内に収容され且つ内部に熱変色性インキが含浸されるインキ吸蔵体３と、該インキ吸蔵体３に接続され且つ軸筒２の前端開口部に取り付けられるペン先４と、軸筒２の後端開口部に取り付けられる摩擦体５とからなる。 The thermochromic writing instrument 1 of the present embodiment is connected to a shaft cylinder 2, an ink occlusion body 3 housed in the shaft cylinder 2 and impregnated with thermochromic ink inside, and the ink occlusion body 3. The pen tip 4 is attached to the front end opening of the shaft tube 2 and the friction body 5 is attached to the rear end opening of the shaft tube 2.

・軸筒
前記軸筒２は、円筒状の前軸２ａと、円筒状の後軸２ｂとからなる。前記前軸２ａの後端部と前記後軸２ｂの前端部は、螺合または嵌合により連結される。前記前軸２ａ及び前記後軸２ｂは、合成樹脂（例えば、ポリプロピレン）の成形体から得られる。 Shaft cylinder The shaft cylinder 2 includes a cylindrical front shaft 2a and a cylindrical rear shaft 2b. The rear end portion of the front shaft 2a and the front end portion of the rear shaft 2b are connected by screwing or fitting. The front shaft 2a and the rear shaft 2b are obtained from a molded body of synthetic resin (for example, polypropylene).

前記軸筒２（後軸２ｂ）の後端開口部の内面には、環状の係合凸部２１が一体に形成される。前記係合凸部２１の前面及び後面は、垂直面となっている。前記係合凸部２１よりも前方の軸筒２（後軸２ｂ）の後端開口部の内面に、環状の平滑面からなる内側シール部２２が形成される。前記内側シール部２２よりも前方の軸筒２の内面には、軸方向に延びる複数のリブ２３が一体に形成される。 An annular engagement convex portion 21 is integrally formed on the inner surface of the rear end opening of the shaft cylinder 2 (rear shaft 2b). The front surface and the rear surface of the engaging convex portion 21 are vertical surfaces. An inner seal portion 22 made of an annular smooth surface is formed on the inner surface of the rear end opening of the shaft cylinder 2 (rear shaft 2b) in front of the engaging convex portion 21. A plurality of ribs 23 extending in the axial direction are integrally formed on the inner surface of the shaft cylinder 2 in front of the inner seal portion 22.

・インキ吸蔵体
前記インキ吸蔵体３は、インキを含浸可能な連続気孔を有する部材（即ち多孔質材料）からなるものであればよく、例えば、繊維束の熱融着加工体、繊維束の樹脂加工体、フェルトの樹脂加工体、フェルトのニードルパンチ加工体、合成樹脂の連続気泡体等が挙げられる。また、前記インキ吸蔵体３は、その外周面に合成樹脂フィルム等よりなる外皮を備える構成でもよい。 Ink occlusion body The ink occlusion body 3 only needs to be made of a member having continuous pores that can be impregnated with ink (that is, a porous material). Examples include a processed body, a felt resin processed body, a felt needle punch processed body, and an open-cell body of a synthetic resin. In addition, the ink occlusion body 3 may be configured to have an outer skin made of a synthetic resin film or the like on the outer peripheral surface thereof.

前記インキ吸蔵体３の内部に熱変色性インキが含浸されている。前記熱変色性インキは、例えば、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。前記インキ吸蔵体３の後端は前記軸筒２内面のリブ２３に当接される。また、前記インキ吸蔵体３の前面にペン先４の後端部が突き刺し接続される。 The ink occlusion body 3 is impregnated with thermochromic ink. Examples of the thermochromic ink include a type that decolors by heating or a type that develops color by heating. The rear end of the ink occlusion body 3 is brought into contact with a rib 23 on the inner surface of the shaft cylinder 2. Further, the rear end portion of the pen tip 4 is pierced and connected to the front surface of the ink occlusion body 3.

・ペン先
前記ペン先４は、軸筒２（前軸２ａ）の前端開口部内面に取り付けられる。前記ペン先４より熱変色性インキが吐出される。前記ペン先４は、繊維の樹脂加工体からなる。前記ペン先４は、これ以外にも、例えば、ボールペンチップ、繊維束の熱融着加工体、フェルト加工体、パイプ状ペン体、先端にスリットを有する万年筆型板状ペン体、毛筆ペン体、合成樹脂の多孔質気泡体、軸方向のインキ誘導路を有する合成樹脂の押出成形体等が挙げられる。 Pen nib The nib 4 is attached to the inner surface of the front end opening of the shaft cylinder 2 (front shaft 2a). Thermochromic ink is ejected from the nib 4. The nib 4 is made of a fiber resin processed body. In addition to this, the nib 4 may be, for example, a ball-point pen tip, a heat-bonded processed body of fiber bundles, a felt processed body, a pipe-shaped pen body, a fountain pen type plate-shaped pen body having a slit at the tip, a brush pen body, Examples thereof include a porous foam of a synthetic resin and an extruded product of a synthetic resin having an axial ink guide path.

・摩擦体
前記摩擦体５は、有底筒状を有する弾性材料の成形体からなる。前記摩擦体５は、前側膨出部５１と、該前側膨出部５１の後方に連設される係合凹部５３と、該係合凹部５３の後方に連設される後側膨出部５２とからなる。前側膨出部５１は、概ね円柱状外面を有し、その外面に環状突起よりなる外側シール部５１ａが一体に形成される。後側膨出部５２は、後方に向かうに従い外径が小さくなる形状を有し、且つ、後端部が凸曲面状に形成される。前記係合凹部５３は、係合凸部２１が係合可能に寸法設定される。即ち、前側膨出部５１の後端の外径が係合凸部２１の内径より大きく設定され、且つ、後側膨出部５２の前端の外径が係合凸部２１の内径より大きく設定される。 Friction body The friction body 5 is formed of a molded body of an elastic material having a bottomed cylindrical shape. The friction body 5 includes a front bulging portion 51, an engagement recess 53 provided continuously behind the front bulge 51, and a rear bulge 52 provided continuously behind the engagement recess 53. It consists of. The front bulging portion 51 has a substantially cylindrical outer surface, and an outer seal portion 51a made of an annular protrusion is integrally formed on the outer surface. The rear-side bulging portion 52 has a shape in which the outer diameter decreases toward the rear, and the rear end portion is formed in a convex curved shape. The engagement recess 53 is dimensioned so that the engagement protrusion 21 can be engaged. That is, the outer diameter of the rear end of the front bulged portion 51 is set larger than the inner diameter of the engaging convex portion 21, and the outer diameter of the front end of the rear bulged portion 52 is set larger than the inner diameter of the engaging convex portion 21. Is done.

また、後側膨出部５２の最大外径が、内側シール部２２の内径（または外側シール部５１ａの外径）より小さく設定される。それにより、後側膨出部５２が、係合凸部２１を乗り越える前に、内側シール部２２に嵌合することを回避でき、摩擦体５の容易な取り付けが可能となる。 Further, the maximum outer diameter of the rear bulge portion 52 is set smaller than the inner diameter of the inner seal portion 22 (or the outer diameter of the outer seal portion 51a). Thus, the rear bulge portion 52 can be prevented from fitting into the inner seal portion 22 before getting over the engagement convex portion 21, and the friction body 5 can be easily attached.

前記摩擦体５の弾性材料は、例えば、ＳＢＳ樹脂、ＳＥＢＳ樹脂、またはシリコーン樹脂等の弾性樹脂材料が挙げられる。前記摩擦体５を構成する弾性材料は、高摩耗性の弾性樹脂（例えば、消しゴム等）からなるものよりも、摩擦時に摩耗カス（消しカス）が殆ど生じない低摩耗性の弾性樹脂からなるものが採用される。前記摩擦体５の後側膨出部５２を用いて、熱変色性インキによる熱変色性の筆跡を摩擦すると、その際に生じる摩擦熱で熱変色性の筆跡が熱変色する。 Examples of the elastic material of the friction body 5 include elastic resin materials such as SBS resin, SEBS resin, and silicone resin. The elastic material constituting the friction body 5 is made of a low-abrasion elastic resin that hardly causes wear debris (erasing debris) during friction, rather than a high-abrasion elastic resin (for example, an eraser). Is adopted. When the thermal discoloration handwriting by the thermochromic ink is rubbed by using the rear side bulging portion 52 of the friction body 5, the thermochromic handwriting is thermally discolored by frictional heat generated at that time.

・作用
前記摩擦体５は、軸筒２（後軸２ｂ）の内部から後方に挿入される。そして、後側膨出部５２が軸筒２の後端開口部内面の係合凸部２１を前方から後方に乗り越え、後側膨出部５２が軸筒２の後端より外部に突出されるとともに、軸筒２の後端開口部内面の係合凸部２１に摩擦体５の係合凹部５３が係合される。それと同時に、摩擦体５の外側シール部５１ａと、軸筒２の後端開口部内面の内側シール部２２とが気密嵌合する。前記外側シール部５１ａと内側シール部２２との気密嵌合により、軸筒２内部と軸筒２外部との軸筒２の後端開口部を介する通気が確実に遮断される。 Action The friction body 5 is inserted rearward from the inside of the shaft cylinder 2 (rear shaft 2b). Then, the rear bulging portion 52 rides over the engaging convex portion 21 on the inner surface of the rear end opening of the shaft cylinder 2 from the front to the rear, and the rear bulging portion 52 projects outward from the rear end of the shaft cylinder 2. At the same time, the engagement recess 53 of the friction body 5 is engaged with the engagement protrusion 21 on the inner surface of the rear end opening of the shaft cylinder 2. At the same time, the outer seal portion 51a of the friction body 5 and the inner seal portion 22 on the inner surface of the rear end opening of the shaft cylinder 2 are airtightly fitted. By the airtight fitting of the outer seal portion 51a and the inner seal portion 22, the ventilation through the rear end opening of the shaft tube 2 between the shaft tube 2 and the shaft tube 2 is reliably blocked.

１ 熱変色性筆記具
２ 軸筒
２ａ 前軸
２ｂ 後軸
２１ 係合凸部
２２ 内側シール部
２３ リブ
３ インキ吸蔵体
４ ペン先
５ 摩擦体
５１ 前側膨出部
５１ａ 外側シール部
５２ 後側膨出部
５３ 係合凹部 DESCRIPTION OF SYMBOLS 1 Thermochromic writing instrument 2 Shaft cylinder 2a Front shaft 2b Rear shaft 21 Engaging convex part 22 Inner seal part 23 Rib 3 Ink occlusion body 4 Pen tip 5 Friction body 51 Front side bulging part 51a Outer seal part 52 Rear side bulging part 53 Engaging recess

Claims (3)

軸筒の内部に熱変色性インキを収容し、前記軸筒の前端に前記熱変色性インキが吐出可能なペン先を備え、前記軸筒の後端に、前記熱変色性インキによる熱変色性の筆跡を摩擦しその際に生じる摩擦熱で前記熱変色性の筆跡を熱変色させる摩擦体を設けた熱変色性筆記具であって、軸筒の後端開口部内面に係合凸部を形成し、前記係合凸部よりも前方の軸筒の後端開口部内面に環状の内側シール部を設け、摩擦体が、外面に環状の外側シール部を有する前側膨出部と、該前側膨出部の後方に連設される係合凹部と、該係合凹部の後方に連設される後側膨出部とからなり、係合凸部と係合凹部とを係合させ、後側膨出部を軸筒の後端より後方に突出させ、外側シール部と内側シール部とを気密嵌合させることにより、軸筒の後端開口部における軸筒内部と軸筒外部との間の通気を遮断することを特徴とする熱変色性筆記具。 A thermochromic ink is accommodated inside the shaft cylinder, a pen tip capable of discharging the thermochromic ink is provided at the front end of the shaft cylinder, and the thermochromic property by the thermochromic ink is provided at the rear end of the shaft cylinder. This is a thermochromic writing instrument provided with a frictional body that rubs the handwriting and heats the thermochromic handwriting with the frictional heat generated at that time, and forms an engaging projection on the inner surface of the rear end opening of the shaft tube. An annular inner seal portion is provided on the inner surface of the rear end opening of the shaft cylinder ahead of the engagement convex portion, and the friction body has a front bulge portion having an annular outer seal portion on the outer surface, and the front bulge portion. An engaging recess provided continuously to the rear of the protruding portion and a rear bulging portion provided continuously to the rear of the engaging recess. By projecting the bulging portion rearward from the rear end of the shaft tube and airtightly fitting the outer seal portion and the inner seal portion, Thermochromic writing instrument, characterized in that blocks the air between the cylinder inside and the barrel outside. 後側膨出部の最大外径が内側シール部の内径より小さく設定され、摩擦体の後側膨出部が係合凸部を前方から後方に乗り越えることにより、係合凸部と係合凹部とを係合させる請求項１記載の熱変色性筆記具。 The maximum outer diameter of the rear bulge portion is set smaller than the inner diameter of the inner seal portion, and the rear bulge portion of the friction body climbs over the engagement convex portion from the front to the rear so that the engagement convex portion and the engagement concave portion The thermochromic writing instrument according to claim 1, wherein 摩擦体の前側膨出部の後端部外径が係合凸部の内径よりも大きく、且つ、摩擦体の後側膨出部の前端部外径が係合凸部の内径よりも大きい請求項１または２記載の熱変色性筆記具。 The rear end outer diameter of the front bulge portion of the friction body is larger than the inner diameter of the engagement convex portion, and the front end outer diameter of the rear bulge portion of the friction body is larger than the inner diameter of the engagement convex portion. Item 3. The thermochromic writing instrument according to item 1 or 2.
JP2009232846A 2009-10-06 2009-10-06 Thermochromic writing utensil Pending JP2011079206A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2009232846A JP2011079206A (en) 2009-10-06 2009-10-06 Thermochromic writing utensil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2009232846A JP2011079206A (en) 2009-10-06 2009-10-06 Thermochromic writing utensil

Publications (1)

Publication Number Publication Date
JP2011079206A true JP2011079206A (en) 2011-04-21

Family

ID=44073778

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2009232846A Pending JP2011079206A (en) 2009-10-06 2009-10-06 Thermochromic writing utensil

Country Status (1)

Country Link
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013095016A (en) * 2011-10-31 2013-05-20 Pilot Corporation Multi-core type thermochromic writing utensil
EP2789474A4 (en) * 2011-12-09 2015-11-25 Mitsubishi Pencil Co Writing instrument with erasing member
KR200489134Y1 (en) * 2018-07-20 2019-09-10 주식회사 모나미 Thermal discoloration ink writing instruments
KR102169972B1 (en) * 2019-04-22 2020-10-26 주식회사 모나미 Knock type Thermal discoloration ink writing instruments
KR20200123897A (en) * 2019-04-22 2020-11-02 주식회사모나미 Thermal discoloration ink writing instruments
JP2022145792A (en) * 2018-10-31 2022-10-04 株式会社パイロットコーポレーション thermochromic writing instrument

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013095016A (en) * 2011-10-31 2013-05-20 Pilot Corporation Multi-core type thermochromic writing utensil
EP2789474A4 (en) * 2011-12-09 2015-11-25 Mitsubishi Pencil Co Writing instrument with erasing member
US9409438B2 (en) 2011-12-09 2016-08-09 Mitsubishi Pencil Company, Limited Writing instrument with erasing member
KR200489134Y1 (en) * 2018-07-20 2019-09-10 주식회사 모나미 Thermal discoloration ink writing instruments
JP2022145792A (en) * 2018-10-31 2022-10-04 株式会社パイロットコーポレーション thermochromic writing instrument
JP7303356B2 (en) 2018-10-31 2023-07-04 株式会社パイロットコーポレーション thermochromic writing instrument
KR102169972B1 (en) * 2019-04-22 2020-10-26 주식회사 모나미 Knock type Thermal discoloration ink writing instruments
KR20200123897A (en) * 2019-04-22 2020-11-02 주식회사모나미 Thermal discoloration ink writing instruments
KR102191748B1 (en) * 2019-04-22 2020-12-17 주식회사 모나미 Thermal discoloration ink writing instruments

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