JP6379010B2 - Thermochromic writing instrument - Google Patents

Thermochromic writing instrument Download PDF

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JP6379010B2
JP6379010B2 JP2014222506A JP2014222506A JP6379010B2 JP 6379010 B2 JP6379010 B2 JP 6379010B2 JP 2014222506 A JP2014222506 A JP 2014222506A JP 2014222506 A JP2014222506 A JP 2014222506A JP 6379010 B2 JP6379010 B2 JP 6379010B2
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cam
friction member
writing instrument
fixed cam
thermochromic writing
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JP2016087862A (en
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栗田　哲宏
哲宏 栗田
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Pilot Corp KK
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本発明は、熱変色性筆記具に関し、詳細には、軸筒の後端開口から突出する弾性材料からなる摩擦部材を有したノック体を操作することにより、軸筒内に配設した固定カムを前進させると共に当該軸筒内に配設した回転カムを回動させ、軸筒の内部に収容した筆記体のペン先が該軸筒の前端孔より突出した状態となる熱変色性筆記具に関する。   The present invention relates to a thermochromic writing instrument, and in particular, by operating a knock body having a friction member made of an elastic material protruding from a rear end opening of a shaft tube, a fixed cam disposed in the shaft tube is provided. The present invention relates to a thermochromic writing instrument that moves forward and rotates a rotating cam disposed in the shaft cylinder so that a pen tip of a writing body accommodated in the shaft cylinder protrudes from a front end hole of the shaft cylinder.

特許文献１および特許文献２には、ペン先から熱変色性インキを吐出可能な筆記体を、軸筒内に前後方向へ移動可能に収容させ、軸筒後方のノック体を前方へ押動することにより、軸筒内に配設したコイルスプリングの弾発力に抗して、筆記体のペン先を軸筒の前端孔から突出させる熱変色性筆記具が開示されている。
特許文献１の熱変色性筆記具では、ノック体を弾性材料から一体で形成して外面に摩擦部を形成しており、特許文献２の熱変色性筆記具では、ノック体の外面に弾性材料からなる摩擦部を外皮として形成している。特許文献１および特許文献２の熱変色性筆記具は、弾性材料からなるノック体の摩擦部で熱変色性インキにより紙面等に形成された筆跡を摩擦して、その際に生じる摩擦熱により前記熱変色性インキの筆跡を熱変色させるものである。
このようなことから、ノック体に摩擦部を設けた熱変色性筆記具においては、摩擦を行いやすくするために、ノック体に設けた摩擦部が摩擦時に変形したり揺れ動かないようにすることが求められている。 In Patent Document 1 and Patent Document 2, a writing body capable of discharging thermochromic ink from a nib is accommodated in a shaft cylinder so as to be movable in the front-rear direction, and a knock body behind the shaft cylinder is pushed forward. Thus, a thermochromic writing instrument is disclosed in which the pen tip of the writing body protrudes from the front end hole of the shaft cylinder against the elastic force of the coil spring disposed in the shaft cylinder.
In the thermochromic writing instrument of Patent Document 1, the knock body is integrally formed from an elastic material and the friction portion is formed on the outer surface. In the thermochromic writing instrument of Patent Document 2, the outer surface of the knock body is made of an elastic material. The friction part is formed as an outer skin. The thermochromic writing instruments of Patent Document 1 and Patent Document 2 rub the handwriting formed on the paper surface or the like with thermochromic ink at the friction part of the knock body made of an elastic material, and the heat is generated by the frictional heat generated at that time. It changes the handwriting of discolorable inks by heat.
For this reason, in a thermochromic writing instrument provided with a friction part on the knock body, the friction part provided on the knock body may be prevented from being deformed or swayed during friction in order to facilitate friction. It has been demanded.

特開２０１１−１５６８２６号公報JP 2011-156826 A 特開２０１１−２３０４７４号公報JP 2011-230474 A

本発明では、ノック体に設けた弾性材料からなる摩擦部材が、摩擦時に変形したり揺れ動き難い構造の熱変色性筆記具を得ることを目的とした。   An object of the present invention is to obtain a thermochromic writing instrument having a structure in which a friction member made of an elastic material provided on a knock body is not easily deformed or swayed during friction.

本発明は、
「１．軸筒の後端開口から突出する弾性材料からなる摩擦部材を有したノック体を操作することにより、前記軸筒内に配設した固定カムを前進させると共に当該軸筒内に配設した回転カムを回動させ、前記軸筒の内部に収容した筆記体のペン先が該軸筒の前端孔より突出した状態となる熱変色性筆記具であって、前記回転カムに前記固定カムの開口部を貫通する突出部を形成し、前記固定カムに前記軸筒の後端開口より突出する筒部を形成し、前記摩擦部材に下方が開口する孔部と前記固定カムの筒部に形成した係止部に係止する係止受部とを設け、前記摩擦部材の前方を前記固定カムの筒部に挿通させ、前記固定カムの係止部を該摩擦部材の係止受部へ係止させると共に、前記回転カムの突出部を前記摩擦部材の孔部へ挿通させることを特徴とした熱変色性筆記具。
２．前記回転カムの突出部と前記摩擦部材の孔部との間に隙間を形成することを特徴とした前記１項に記載の熱変色性筆記具。
３．前記ノック体が、前記摩擦部材を被覆可能なカバーを有し、前記カバーの下部を前記固定カムの上部に嵌着させた状態で、前記カバーの下部と前記固定カムに形成した段部とが当接することを特徴とした前記１項または２項に記載の熱変色性筆記具。」である。 The present invention
"1. By operating a knock body having a friction member made of an elastic material protruding from the rear end opening of the shaft tube, the fixed cam disposed in the shaft tube is advanced and disposed in the shaft tube. A thermochromic writing instrument in which the pen tip of the writing body accommodated in the shaft cylinder protrudes from the front end hole of the shaft cylinder, wherein the rotating cam is rotated. A projecting portion that penetrates the opening is formed, a cylindrical portion that projects from the rear end opening of the shaft cylinder is formed on the fixed cam, and a hole that opens downward in the friction member and a cylindrical portion of the fixed cam are formed. A locking receiving portion for locking to the locking portion is inserted, the front of the friction member is inserted through the cylindrical portion of the fixed cam, and the locking portion of the fixed cam is engaged with the locking receiving portion of the friction member. And the protrusion of the rotary cam is inserted through the hole of the friction member. And the thermochromic writing instrument.
2. 2. The thermochromic writing instrument according to item 1, wherein a gap is formed between the protruding portion of the rotating cam and the hole of the friction member.
3. The knock body has a cover capable of covering the friction member, and a lower portion of the cover and a step portion formed on the fixed cam in a state where the lower portion of the cover is fitted to the upper portion of the fixed cam. 3. The thermochromic writing instrument according to 1 or 2 above, wherein the thermochromic writing instrument is in contact. Is.

摩擦部材を成形する弾性材料は、弾性を有する樹脂（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、エチレンプロピレンジエンゴム（ＥＰＤＭ）等が挙げられる。尚、前記摩擦部材を成形する弾性材料は、高摩耗性の弾性材料（例えば、消しゴム等）よりも、摩擦時に消しカスが生じない低摩耗性の弾性材料が好ましい。また、固定カムと回転カムは弾性材で形成された摩擦部材を支持させるために、硬質樹脂や金属など硬質材料で形成すればよい。   Examples of the elastic material for molding the friction member include elastic resins (rubber and elastomer). For example, silicone resin, SBS resin (styrene-butadiene-styrene copolymer), SEBS resin (styrene-ethylene-butadiene-styrene). Copolymer), fluorine resin, chloroprene resin, nitrile resin, polyester resin, ethylene propylene diene rubber (EPDM), and the like. Note that the elastic material for forming the friction member is preferably a low-abrasion elastic material that does not cause debris during friction, rather than a high-abrasion elastic material (for example, an eraser). The fixed cam and the rotating cam may be formed of a hard material such as hard resin or metal in order to support the friction member formed of an elastic material.

固定カムの筒部に形成する係止部と摩擦部材に形成する係止受部との関係は、例えば固定カムの筒部の内側面に係止凸部または係止凹部を形成し、摩擦部材の外側面に前記係止凸部と係止する係止凹部または係止凸部を形成して互いを係止させることで得ることができ、あるいは固定カムの筒部の内側面に雌螺子部を形成し、摩擦部材の外側面に雄螺子部を形成して互いを螺合することでも得ることができる。   The relationship between the locking portion formed on the cylindrical portion of the fixed cam and the locking receiving portion formed on the friction member is such that, for example, a locking convex portion or a locking concave portion is formed on the inner surface of the cylindrical portion of the fixed cam, and the friction member Can be obtained by forming a locking recess or a locking projection for locking with the locking projection on the outer side surface of the locking cam and locking each other, or a female screw portion on the inner surface of the cylindrical portion of the fixed cam Can be obtained by forming a male screw portion on the outer surface of the friction member and screwing them together.

本発明の熱変色性筆記具によれば、ノック体に設けた摩擦部材の外側面が軸筒の後端開口から突出する固定カムに形成した筒部で支持され、且つ摩擦部材の孔部が回転カムに形成した突出部で支持されるので、摩擦時において摩擦部材が変形したり揺れ動くことを防止することができる。
さらに回転カムの突出部と摩擦部材の孔部との間に隙間を形成することで、ノック体の操作時において、回動しない摩擦部材の孔部内で回動する回転カムの突出部の動きが妨げられることがないので、回転カムを滑らかに回動させることができる。
さらに摩擦部材をカバーで被覆することで、摩擦部材に触れることなくカバーを押動しての操作が可能となり、紙面等に接触する摩擦部材が汚れることを防止できる。 According to the thermochromic writing instrument of the present invention, the outer surface of the friction member provided on the knock body is supported by the cylinder formed on the fixed cam protruding from the rear end opening of the shaft cylinder, and the hole of the friction member rotates. Since it is supported by the protrusion formed on the cam, it is possible to prevent the friction member from being deformed or swaying during friction.
Further, by forming a gap between the protruding portion of the rotating cam and the hole portion of the friction member, the movement of the protruding portion of the rotating cam that rotates within the hole portion of the friction member that does not rotate is operated during operation of the knock body. Since it is not obstructed, the rotating cam can be smoothly rotated.
Further, by covering the friction member with the cover, it is possible to perform an operation by pushing the cover without touching the friction member, and it is possible to prevent the friction member contacting the paper surface from being stained.

本実施例のボールペンにおける筆記体のペン先を軸筒の内部に収容した状態を示した断面図である。It is sectional drawing which showed the state which accommodated the pen point of the cursive body in the ball-point pen of a present Example inside the axial cylinder. 本実施例のボールペンにおける筆記体のペン先を軸筒の前端開口より突出させた状態を示した断面図である。It is sectional drawing which showed the state which made the pen point of the writing body in the ball-point pen of a present Example protrude from the front-end opening of a shaft cylinder. 本実施例のボールペンの要部を示した分解図である。It is the exploded view which showed the principal part of the ball-point pen of a present Example. 本実施例のボールペンで筆記を行っている状態を示した斜視図である。It is the perspective view which showed the state which is writing with the ball-point pen of a present Example. 本実施例のボールペンからカバーを外した状態を示す断面図である。It is sectional drawing which shows the state which removed the cover from the ball-point pen of a present Example. 本実施例のボールペンで摩擦を行っている状態を示した斜視図である。It is the perspective view which showed the state which is performing friction with the ball-point pen of a present Example.

次に図面を参照しながら、本実施例の熱変色性筆記具について説明を行う。尚、本実施例では、熱変色性筆記具としてボールペンについての説明を行うが、本発明は以下の実施例に限定されるものではない。また、図中の同じ部材、同じ部品については、同じ符号としてある。図中においてペン先がある側を前方とし反対側を後方として表現する。   Next, the thermochromic writing instrument of the present embodiment will be described with reference to the drawings. In this embodiment, a ballpoint pen will be described as a thermochromic writing instrument, but the present invention is not limited to the following embodiment. In addition, the same members and the same parts in the drawings are denoted by the same reference numerals. In the figure, the side with the pen tip is expressed as the front and the opposite side is expressed as the back.

図１〜図３を用いて、本実施例のボールペン構造について説明を行う。
図１は本実施例のボールペンにおける筆記体のペン先を軸筒の内部に収容した状態を示した断面図である。図２は本実施例のボールペンにおける筆記体のペン先を軸筒の前端開口より突出させた状態を示した断面図である。図３は本実施例のボールペンの要部を示した分解図である。
ボールペン１は、前軸２と後軸３とを螺合して形成した軸筒４内に、レフィル５を収容してある。レフィル５は、ボールペンチップをペン先６とし、ペン先６の後方にインキ収容筒７を装着してあり、軸筒４内に配したコイルスプリング８にて後方へ弾発され、軸筒４の後端開口４ａから突出した摩擦部材９を有したノック体１０を前方へ押動するように操作することによって、軸筒４の前端開口４ｂからペン先６を出没させることができる構造である。 The ball-point pen structure of the present embodiment will be described with reference to FIGS.
FIG. 1 is a cross-sectional view showing a state in which a pen tip of a writing body in the ballpoint pen of the present embodiment is housed inside a shaft cylinder. FIG. 2 is a cross-sectional view showing a state in which the pen tip of the writing body in the ballpoint pen of this embodiment is projected from the front end opening of the shaft cylinder. FIG. 3 is an exploded view showing the main part of the ballpoint pen of this embodiment.
The ballpoint pen 1 contains a refill 5 in a shaft cylinder 4 formed by screwing a front shaft 2 and a rear shaft 3 together. The refill 5 uses a ballpoint pen tip as a pen tip 6, and an ink containing cylinder 7 is mounted on the rear side of the pen tip 6, and is repelled rearward by a coil spring 8 disposed in the shaft cylinder 4. By operating the knock body 10 having the friction member 9 protruding from the rear end opening 4a so as to push forward, the pen tip 6 can be projected and retracted from the front end opening 4b of the shaft cylinder 4.

軸筒４の内部には、従来構造の回転カム機構が設けられており、後軸３の後端部３ａの内壁面には複数のカム溝１１を形成してあり、前方に山型状の凹凸部１２ａを形成し、外周面に前記カム溝１１に係合する複数の突起１２ｂを有した固定カム１２を配設し、固定カム１２の前方に、前記カム溝１１に係合する複数のカム突起１３ａを外周面に周状に形成し、前記固定カム部１２の凹凸部１２ａに噛合う噛合部１３ｂを有した回転カム１３を配設してあり、カム突起１３ａはカム溝１１に係止して回転カム１３はカム溝１１に沿って前後に移動可能としてある。
また回転カム１３の後方には、固定カム１２の開口部１２ｃを貫通する突出部１３ｃを形成してあり、固定カム１２の後方には、軸筒４の後端開口４ａから突出する筒部１２ｄを形成してある。本実施例の突出部１３ｃは、下方の大径部１３１ｃと上方の小径部１３２ｃとで構成してある。 A rotary cam mechanism having a conventional structure is provided inside the shaft cylinder 4, and a plurality of cam grooves 11 are formed on the inner wall surface of the rear end portion 3 a of the rear shaft 3. A fixed cam 12 having a concavo-convex portion 12 a and having a plurality of protrusions 12 b that engage with the cam groove 11 on the outer peripheral surface is disposed, and a plurality of engaging cams 11 are engaged in front of the fixed cam 12. The cam projection 13a is formed on the outer peripheral surface in a circumferential shape, and a rotating cam 13 having a meshing portion 13b that meshes with the concavo-convex portion 12a of the fixed cam portion 12 is disposed. The rotary cam 13 is stopped and can be moved back and forth along the cam groove 11.
Further, a projecting portion 13c penetrating the opening 12c of the fixed cam 12 is formed behind the rotating cam 13, and a tube portion 12d projecting from the rear end opening 4a of the shaft tube 4 is formed behind the fixed cam 12. Is formed. The protruding portion 13c of this embodiment is composed of a lower large diameter portion 131c and an upper small diameter portion 132c.

本実施例のボールペン１は、図１に示した状態のノック体１０を前方へ押動するように操作することで、固定カム１２の前進に伴い回転カム１３のカム突起１３ａがカム溝１１の前端に移動し、固定カム１２の凹凸部１２ａの傾斜により回転カム１３のカム突起１３ａのカム斜面１３ｄがカム溝１１のカム斜面１１ａを滑り、レフィル５を介してコイルスプリング８で後方へ弾発された回転カム１３のカム突起１３ａが複数のカム溝１１間に形成された係合部１１ｂに係合して、ペン先６を軸筒４の前端開口４ｂから突出させた状態で維持することができ、図２に示した状態のノック体１０を再度前方へ押動するように操作することで、回転カム１３のカム突起１３ａとカム溝１１間の係合部１１ｂの係合状態を解除して、回転カム１３のカム突起１３ａと固定カム１２の突起１２ｂをカム溝１１の後方へ後退させ、図１に示した状態のようにペン先６を軸筒４の内部に収容させることができる。   The ballpoint pen 1 of this embodiment is operated so as to push forward the knock body 10 in the state shown in FIG. 1, so that the cam projection 13 a of the rotating cam 13 moves into the cam groove 11 as the fixed cam 12 advances. The cam slope 13 d of the cam projection 13 a of the rotating cam 13 slides on the cam slope 11 a of the cam groove 11 due to the inclination of the concavo-convex portion 12 a of the fixed cam 12, and is repelled rearward by the coil spring 8 through the refill 5. The cam projection 13a of the rotating cam 13 is engaged with the engaging portion 11b formed between the plurality of cam grooves 11, and the pen tip 6 is maintained in a state of protruding from the front end opening 4b of the shaft cylinder 4. 2, the engagement state of the engagement portion 11b between the cam projection 13a of the rotating cam 13 and the cam groove 11 is released by operating the knock body 10 in the state shown in FIG. The rotation cam 13 The projection 13a and the projection 12b of the fixed cam 12 is retracted to the rear of the cam groove 11, it is possible to accommodate the nib 6 as in the state shown in FIG. 1 inside the barrel 4.

また摩擦部材９は、下方の外側面９ａに係止凹部９ｂを形成し、下方が開口する孔部９ｃを形成し、摩擦部材９の係止凹部９ｂに対して固定カム１２の内方に突設した係止凸部１２ｅを係止させ、摩擦部材９の孔部９ｃに対して回転カム１３に形成した突出部１３ｃの小径部１３２ｃを挿通させている。
またノック体１０は、摩擦部材９をカバー１４で被覆しており、カバー１４を固定カム１２の筒部１２ｄに嵌着させた状態で、カバー１４の下部１４ａと固定カム１２に形成した段部１２ｆとが当接するので、ノック体１０の一部であるカバー１４を押動することで固定カム１４を前進させることができる構造としてある。 Further, the friction member 9 is formed with a locking recess 9b in the lower outer surface 9a, and a hole 9c that is open at the lower side, and protrudes inward of the fixed cam 12 with respect to the locking recess 9b of the friction member 9. The provided locking projection 12e is locked, and the small diameter portion 132c of the protruding portion 13c formed on the rotating cam 13 is inserted into the hole 9c of the friction member 9.
The knock body 10 covers the friction member 9 with a cover 14, and the step formed on the lower portion 14 a of the cover 14 and the fixed cam 12 with the cover 14 fitted to the cylindrical portion 12 d of the fixed cam 12. 12f abuts, so that the fixed cam 14 can be advanced by pushing the cover 14 which is a part of the knock body 10.

カバー１４は透明な硬質樹脂で形成しており、摩擦部材９は半透明な弾性樹脂で成形しており、カバー１４を透して回転カム１３に形成した突出部１３ｃの小径部１３２ｃを見ることができ、小径部１３２ｃをインキ収容筒７内に収容したインキ色と同じ色としたことから、小径部１３２ｃの色にてボールペン１の筆記色を確認することができ便利である。 尚、本実施例のボールペン１は、ノック体１０を操作してペン先６を軸筒４の前端開口４ｂから突出させた状態においても、回転カム１３に形成した突出部１３ｃの小径部１３２ｃが軸筒４の後端開口４ａから突出した状態になるので（図２参照）、小径部１３２ｃの色で筆記色を確認することができた。
図４に示すように、本実施例のボールペン１は、軸筒４の前端開口４ｂから突出させたペン先６で紙面１００に熱変色性インキの筆跡１０１を形成することができた。 The cover 14 is formed of a transparent hard resin, the friction member 9 is formed of a translucent elastic resin, and the small diameter portion 132c of the protruding portion 13c formed on the rotating cam 13 is seen through the cover 14. Since the small diameter portion 132c has the same color as the ink color accommodated in the ink accommodating cylinder 7, the writing color of the ballpoint pen 1 can be confirmed with the color of the small diameter portion 132c. In the ballpoint pen 1 of the present embodiment, the small diameter portion 132c of the protruding portion 13c formed on the rotary cam 13 is also in a state where the knock body 10 is operated to cause the pen tip 6 to protrude from the front end opening 4b of the shaft cylinder 4. Since it protruded from the rear end opening 4a of the shaft cylinder 4 (see FIG. 2), the writing color could be confirmed by the color of the small diameter portion 132c.
As shown in FIG. 4, the ballpoint pen 1 of the present embodiment was able to form the thermochromic ink handwriting 101 on the paper surface 100 with the pen tip 6 projected from the front end opening 4 b of the shaft tube 4.

次に、図５および図６を用いて、本実施例のボールペンで摩擦を行う状態についての説明を行う。図５は本実施例のボールペンからカバーを外した状態を示す断面図である。図５に示すように本実施例のボールペンは、摩擦部材９の外側面９ａが固定カム１４に形成した筒部１２ｄで支持され、且つ摩擦部材９の孔部９ｃが回転カム１３に形成した突出部１３ｃの小径部１３２ｃで支持されるので、図６に示した摩擦部材９による摩擦時においても、摩擦部材９が変形したり揺れ動くことを防止することができた。   Next, a state where friction is performed with the ballpoint pen of the present embodiment will be described with reference to FIGS. 5 and 6. FIG. 5 is a cross-sectional view showing a state where the cover is removed from the ballpoint pen of this embodiment. As shown in FIG. 5, the ballpoint pen of the present embodiment is supported by a cylindrical portion 12 d formed on the fixed cam 14 on the outer surface 9 a of the friction member 9, and a protrusion formed on the rotary cam 13 in the hole portion 9 c of the friction member 9. Since it is supported by the small diameter portion 132c of the portion 13c, it is possible to prevent the friction member 9 from being deformed or swaying even during friction by the friction member 9 shown in FIG.

また本実施例では、回転カム１３に形成した突出部１３ｃの小径部１３２ｃと摩擦部材９の孔部９ｂとの間に隙間Ｓを形成することで、ノック体の操作時において、回動しない摩擦部材９の孔部９ｂ内で回動する回転カム１３に形成した突出部１３ｃの小径部１３２ｃの動きが妨げられることがなく、回転カム１３が滑らかに回動することができた。
さらに、摩擦部材９にカバー１４を被覆したことで、摩擦部材９に触れることなくカバー１４を押動する操作が可能となり、摩擦時において紙面１００に接触する摩擦部材９の汚れを防止することができた。 Further, in this embodiment, by forming a gap S between the small diameter portion 132c of the projecting portion 13c formed on the rotating cam 13 and the hole portion 9b of the friction member 9, friction that does not rotate during operation of the knock body. The movement of the small-diameter portion 132c of the protruding portion 13c formed on the rotating cam 13 rotating in the hole 9b of the member 9 was not hindered, and the rotating cam 13 was able to rotate smoothly.
Furthermore, by covering the friction member 9 with the cover 14, it is possible to push the cover 14 without touching the friction member 9, and to prevent the friction member 9 coming into contact with the paper surface 100 during friction. did it.

１…ボールペン、２…前軸、
３…後軸、３ａ…後端部、
４…軸筒、４ａ…後端開口、４ｂ…前端開口、
５…レフィル、６…ペン先、
７…インキ収容筒、８…コイルスプリング、
９…摩擦部材、９ａ…外側面、９ｂ…係止凹部、９ｃ…孔部、
１０…ノック体、
１１…カム溝、１１ａ…カム斜面、１１ｂ…係合部、
１２…固定カム、１２ａ…凹凸部、１２ｂ…突起、
１２ｃ…開口部、１２ｄ…筒部、１２ｅ…係止凸部
１２ｆ…段部、
１３…回転カム、１３ａ…カム突起、１３ｂ…噛合部、
１３ｃ…突出部、１３１ｃ…大径部、１３２ｃ…小径部、
１３ｄ…カム斜面、
１４…カバー、１４ａ…下部、
１００…紙面、１０１…筆跡、
Ｓ…隙間。 1 ... ballpoint pen, 2 ... front shaft,
3 ... rear axle, 3a ... rear end,
4 ... shaft cylinder, 4a ... rear end opening, 4b ... front end opening,
5 ... refill, 6 ... nib,
7 ... Ink container, 8 ... Coil spring,
9 ... friction member, 9a ... outer surface, 9b ... locking recess, 9c ... hole,
10 ... Knock body,
11 ... Cam groove, 11a ... Cam slope, 11b ... Engagement part,
12 ... Fixed cam, 12a ... Uneven portion, 12b ... Projection,
12c ... Opening part, 12d ... Cylinder part, 12e ... Locking convex part 12f ... Step part,
13 ... Rotating cam, 13a ... Cam projection, 13b ... Meshing part,
13c ... projecting part, 131c ... large diameter part, 132c ... small diameter part,
13d ... Cam slope,
14 ... cover, 14a ... bottom,
100 ... paper, 101 ... handwriting,
S ... Gap.

Claims (3)

軸筒の後端開口から突出する弾性材料からなる摩擦部材を有したノック体を操作することにより、前記軸筒内に配設した固定カムを前進させると共に当該軸筒内に配設した回転カムを回動させ、前記軸筒の内部に収容した筆記体のペン先が該軸筒の前端孔より突出した状態となる熱変色性筆記具であって、前記回転カムに前記固定カムの開口部を貫通する突出部を形成し、前記固定カムに前記軸筒の後端開口より突出する筒部を形成し、前記摩擦部材に下方が開口する孔部と前記固定カムの筒部に形成した係止部に係止する係止受部とを設け、前記摩擦部材の前方を前記固定カムの筒部に挿通させ、前記固定カムの係止部を該摩擦部材の係止受部へ係止させると共に、前記回転カムの突出部を前記摩擦部材の孔部へ挿通させることを特徴とした熱変色性筆記具。 By operating a knock body having a friction member made of an elastic material protruding from the rear end opening of the shaft tube, the fixed cam disposed in the shaft tube is advanced and a rotating cam disposed in the shaft tube Is a thermochromic writing instrument in which the nib of the writing body accommodated in the shaft cylinder protrudes from the front end hole of the shaft cylinder, and the opening of the fixed cam is provided in the rotating cam. A projecting portion that penetrates is formed, a cylindrical portion that projects from the rear end opening of the shaft cylinder is formed on the fixed cam, and a hole that opens downward in the friction member and a locking portion that is formed on the cylindrical portion of the fixed cam A locking receiving portion that locks to the portion, the front of the friction member is inserted through the cylindrical portion of the fixed cam, and the locking portion of the fixed cam is locked to the locking receiving portion of the friction member. The protruding portion of the rotating cam is inserted into the hole of the friction member. Thermochromic writing instrument. 前記回転カムの突出部と前記摩擦部材の孔部との間に隙間を形成することを特徴とした請求項１に記載の熱変色性筆記具。 The thermochromic writing instrument according to claim 1, wherein a gap is formed between the protruding portion of the rotating cam and the hole of the friction member. 前記ノック体が、前記摩擦部材を被覆可能なカバーを有し、前記カバーの下部を前記固定カムの上部に嵌着させた状態で、前記カバーの下部と前記固定カムに形成した段部とが当接することを特徴とした請求項１または２に記載の熱変色性筆記具。 The knock body has a cover capable of covering the friction member, and a lower portion of the cover and a step portion formed on the fixed cam in a state where the lower portion of the cover is fitted to the upper portion of the fixed cam. The thermochromic writing instrument according to claim 1, wherein the thermochromic writing instrument is in contact with the thermochromic writing instrument.
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