JP5758704B2 - Swing-out mechanical pencil - Google Patents

Swing-out mechanical pencil Download PDF

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JP5758704B2
JP5758704B2 JP2011126343A JP2011126343A JP5758704B2 JP 5758704 B2 JP5758704 B2 JP 5758704B2 JP 2011126343 A JP2011126343 A JP 2011126343A JP 2011126343 A JP2011126343 A JP 2011126343A JP 5758704 B2 JP5758704 B2 JP 5758704B2
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shaft
weight
diameter
swing
mechanical pencil
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JP2012250500A (en
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正昭 久保田
正昭 久保田
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株式会社パイロットコーポレーション
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本発明は、振ることにより生じる重量体の慣性力を利用して芯を繰り出す振出式シャープペンシルに関するものである。   The present invention relates to a swing-out type mechanical pencil that draws out a core by utilizing an inertial force of a weight body generated by shaking.
従来、線をコイル状に巻回して重量体を構成し、その前部及び後部をコイルスプリング部として弾性を持たせ、振ることにより生ずる重量体の慣性力を利用して芯を繰り出すシャープペンシルが知られている。(特許文献1参照)   Conventionally, a mechanical pencil that winds a core using the inertial force of a weight body that is formed by winding a wire in a coil shape to make the front and rear portions elastic as coil spring portions and shaking the weight body. Are known. (See Patent Document 1)
しかしながら、上記シャープペンシルは、重量体が摺動した時、前部及び後部のコイルスプリング部が軸筒の内面に接触すると、コイルスプリング部が撓んで摩擦抵抗が増大し摺動しにくくなるとともに、接触音が発生してしまうという問題があった。そのため、従来は余裕をとって重量体の外面と軸筒の内面の隙間を大きくしなければならなかった。   However, in the mechanical pencil, when the weight body slides, when the front and rear coil spring portions come into contact with the inner surface of the shaft tube, the coil spring portion is bent and the frictional resistance is increased and the sliding becomes difficult. There was a problem that contact sound was generated. Therefore, conventionally, it has been necessary to increase the clearance between the outer surface of the weight body and the inner surface of the shaft cylinder with a margin.
実公昭63−23181号公報Japanese Utility Model Publication No. 63-23181
解決しようとする問題点は、重量体の外面と軸筒の内面の隙間を大きくすると軸筒の外径が太くなってしまう点である。   The problem to be solved is that when the gap between the outer surface of the weight body and the inner surface of the shaft tube is increased, the outer diameter of the shaft tube becomes thicker.
本発明は、予備の芯を収納する芯タンクと軸筒の間に重量体を摺動可能に設け、振ることにより生じる重量体の慣性力によりチャックを前進させて芯を繰り出す振出式シャープペンシルであって、線をコイル状に巻回して重量体を構成し、その重量体の前部及び後部にコイルスプリング部を構成し、かつ、前部と後部の間に線材をコイル状に密着させて太径部を構成し、太径部の外径を前部及び後部の外径より太径に構成し、重量体の前部内面及び後部内面と芯タンクの外面の隙間より重量体の太径部外面と軸筒の内孔内面の隙間の方を狭く構成したことを最も主要な特徴とする。 The present invention is a swing-out mechanical pencil that slidably installs a weight body between a core tank for storing a spare core and a shaft cylinder, and advances the chuck by the inertial force of the weight body generated by shaking. A coil is wound to form a weight body, a coil spring portion is formed at the front and rear of the weight body, and the wire is closely attached to the coil between the front and rear portions. Configure the large diameter part, configure the outer diameter of the large diameter part to be larger than the outer diameter of the front part and the rear part, and the large diameter of the weight body from the gap between the front inner surface and rear inner surface of the weight body and the outer surface of the core tank The main feature is that the gap between the outer surface of the part and the inner surface of the inner hole of the shaft cylinder is narrower .
本発明は、コイルスプリング部を有する前部及び後部の外径より太径部の外径を太く構成することにより、前部及び後部が軸筒の内面に接触する恐れがなく、重量体の摺動を確実に行えるとともに重量体と軸筒の接触音が発生しないという利点が得られるものである。   According to the present invention, the outer diameter of the large-diameter portion is made larger than the outer diameter of the front portion and the rear portion having the coil spring portion, so that there is no possibility that the front portion and the rear portion are in contact with the inner surface of the shaft cylinder. It is possible to obtain an advantage that the movement can be performed reliably and the contact sound between the weight body and the shaft cylinder is not generated.
図1は本発明の実施例1の振出式シャープペンシルを示す断面図である。(実施例1)FIG. 1 is a cross-sectional view showing a swing-out mechanical pencil according to a first embodiment of the present invention. (Example 1) 図2は図1の重量体を示す拡大断面図である。(実施例1)FIG. 2 is an enlarged cross-sectional view showing the weight body of FIG. (Example 1) 図3は図1のA−A線を示す拡大断面図である。(実施例1)FIG. 3 is an enlarged cross-sectional view taken along line AA of FIG. (Example 1) 図4は図1のB−B線を示す拡大断面図である。(実施例1)4 is an enlarged sectional view taken along line BB in FIG. (Example 1) 図5は図1のC−C線を示す拡大断面図である。(実施例1)FIG. 5 is an enlarged sectional view taken along line CC of FIG. (Example 1) 図6は本発明の実施例2の振出式シャープペンシルを示す断面図である。(実施例2)FIG. 6 is a cross-sectional view showing a swing-out mechanical pencil according to a second embodiment of the present invention. (Example 2)
本発明は、前部と後部の間に線材をコイル状に密着させて太径部を構成し、太径部の外径を前部及び後部の外径より太径に構成して、重量体の摺動を確実に行うとともに重量体と軸筒の接触音が発生しない振出式シャープペンシルを実現した。   In the present invention, a wire rod is closely attached in a coil shape between a front portion and a rear portion to form a large diameter portion, and an outer diameter of the large diameter portion is configured to be larger than an outer diameter of the front portion and the rear portion, A swing-out mechanical pencil that does not cause contact noise between the weight body and the shaft tube has been realized.
以下、図1、図2、図3、図4及び図5に基づいて本発明における実施例1の振出式シャープペンシルを説明する。また、図1の左側を前方とし右側を後方とする。先ず、チャック1と、コネクター2を介してチャック1に連結されかつ予備の芯3を収納したパイプ状の芯タンク4と、チャック1の頭部1Aに外嵌された締具5と、締具5を受け止める連結具6と、連結具6とコネクター2の間に200g以下の取付時荷重で設けられるスプリング7とにより振出式シャープペンシルの機構部を構成する。   Hereinafter, based on FIG.1, FIG.2, FIG.3, FIG.4 and FIG. 5, the swing-out type mechanical pencil of Example 1 in this invention is demonstrated. Moreover, let the left side of FIG. 1 be the front, and let the right side be back. First, a chuck 1, a pipe-shaped core tank 4 that is connected to the chuck 1 via a connector 2 and accommodates a spare core 3, a fastener 5 that is externally fitted to the head 1 </ b> A of the chuck 1, and a fastener 5 and the spring 7 provided with a load at the time of attachment of 200 g or less between the connector 6 and the connector 2 constitute a mechanical part of the swing-out mechanical pencil.
前記機構部の芯タンク4及びコネクター2が挿通可能に前軸8の前部孔8Aを構成し、前軸8の前端と前軸8の前部に着脱可能に螺合された先部材9の内段9Aにより連結具6を挾持する。前記先部材9には芯3を適度の力で保持するゴム等の弾性体で構成された芯ホルダー10が内蔵されている。また、前軸8の前部細径部8Bにはゴム製の軟質材で構成されたグリップ11が取り付けられる。更に、前軸8には、前部孔8Aより太径の内孔8Cを形成するとともに、後端から開口されかつ前記内孔8Cより太径の後部孔8Dを形成する。更に、前軸8の後部に係止窓8Eを形成し、この係止窓8Eと対向する位置に後端から長手方向前方に伸びた凹溝8Fを形成する。   A front hole 8A of the front shaft 8 is configured so that the core tank 4 and the connector 2 of the mechanism portion can be inserted, and the front member 8 is detachably screwed to the front end of the front shaft 8 and the front portion of the front shaft 8. The connector 6 is held by the inner stage 9A. The tip member 9 contains a lead holder 10 made of an elastic body such as rubber that holds the lead 3 with an appropriate force. A grip 11 made of a soft rubber material is attached to the front narrow diameter portion 8B of the front shaft 8. Further, the front shaft 8 is formed with an inner hole 8C having a diameter larger than that of the front hole 8A, and a rear hole 8D that is opened from the rear end and has a diameter larger than that of the inner hole 8C. Further, a locking window 8E is formed at the rear portion of the front shaft 8, and a concave groove 8F extending forward in the longitudinal direction from the rear end is formed at a position facing the locking window 8E.
更に、図2に示したように、重量体12は金属製の線を巻回して円筒状に構成し、この重量体12の前部12Aにコイルスプリング部12Bを構成するとともに重量体12の後部12Cにコイルスプリング部12Dを構成する。前記前部12Aと後部12Cの間には線をコイル状に密着させて太径部12Eを構成し、太径部12Eの外径を前部12A及び後部12Cの外径より太径に構成する。この重量体12を、前軸8の内孔8Cと芯タンク4の間に長手方向に摺動可能に配置する。また、重量体12の前部12A内面及び後部12C内面と芯タンク4の外面の隙間より重量体12の太径部12Eと前軸8の内孔8C内面の隙間の方が狭く構成する。   Further, as shown in FIG. 2, the weight body 12 is formed in a cylindrical shape by winding a metal wire, and a coil spring portion 12 </ b> B is formed on the front portion 12 </ b> A of the weight body 12 and the rear portion of the weight body 12. A coil spring portion 12D is formed on 12C. Between the front part 12A and the rear part 12C, a wire is closely attached in a coil shape to form a large diameter part 12E, and the outer diameter of the large diameter part 12E is configured to be larger than the outer diameters of the front part 12A and the rear part 12C. . The weight body 12 is disposed between the inner hole 8C of the front shaft 8 and the core tank 4 so as to be slidable in the longitudinal direction. Further, the gap between the large diameter portion 12E of the weight body 12 and the inner surface of the inner hole 8C of the front shaft 8 is narrower than the gap between the inner surface of the front portion 12A and the rear portion 12C of the weight body 12 and the outer surface of the core tank 4.
更にまた、後軸13は上側にクリップ14を一体に形成するとともに、前部に細径部13Aを形成する。この細径部13Aの外周面には前記クリップ14の真下に位置して突起13Bを形成するとともに、細径部13Aの両側部に長手方向に伸びた開口窓13Cを対向して形成し、突起13Bが位置する細径部13Aが適宜弾性変形可能に構成する。この後軸13には、前部内側に芯タンク4の横振れを防止するための内鍔13Dが形成されるとともに、後部内側にはリターンスプリング15を当接するための段部13Eが形成される。更に、後軸13の後部孔の上下には前記開口窓13Cと軸心に対して90度ずれた位置にキー溝13Fが対向して形成されている。   Furthermore, the rear shaft 13 is integrally formed with a clip 14 on the upper side, and a small-diameter portion 13A is formed on the front portion. Protrusions 13B are formed on the outer peripheral surface of the small-diameter portion 13A so as to be located immediately below the clip 14, and open windows 13C extending in the longitudinal direction are formed on both sides of the small-diameter portion 13A so as to face each other. The small-diameter portion 13A where 13B is located is configured to be appropriately elastically deformable. The rear shaft 13 is formed with an inner flange 13D for preventing the core tank 4 from sideways on the inner side of the front part, and a step part 13E for contacting the return spring 15 is formed on the inner side of the rear part. . Further, a key groove 13F is formed above and below the rear hole of the rear shaft 13 so as to face the opening window 13C at a position shifted by 90 degrees with respect to the axial center.
更にまた、押圧部材16の前部筒16A外周面にはそれぞれ突起16Bが形成されるとともに、前部筒16Aの上下に開口窓16Cが対向して形成され、突起16Bが位置する前部筒16Aが弾性変形可能に構成されている。この押圧部材16の後部には外鍔部16Dが形成され、この外鍔部16Dの上下には前記突起16Bと軸心に対して90度ずれた位置に外方に突出したキー16Eがそれぞれ形成される。更に、押圧部材16の内面には芯挿通孔を有する内鍔16Fが形成され、この内鍔16Fの前面が芯タンク4の後端を押圧する押圧面となっている。   Furthermore, a protrusion 16B is formed on the outer peripheral surface of the front cylinder 16A of the pressing member 16, and an opening window 16C is formed on the top and bottom of the front cylinder 16A so as to face each other, and the front cylinder 16A in which the protrusion 16B is located. Is configured to be elastically deformable. An outer flange portion 16D is formed at the rear portion of the pressing member 16, and keys 16E that protrude outwardly are formed above and below the outer flange portion 16D at positions shifted by 90 degrees with respect to the projection 16B. Is done. Further, an inner flange 16F having a core insertion hole is formed on the inner surface of the pressing member 16, and the front surface of the inner flange 16F serves as a pressing surface that presses the rear end of the core tank 4.
この押圧部材16の前部にリターンスプリング15を外嵌した後、後軸13の後方より押圧部材16を後軸13のキー溝13Fに押圧部材16のキー16Eを合わせて挿入し、押圧部材16の突起16Bを後軸13の開口窓13Cに長手方向に摺動可能に遊嵌する。しかも前記リターンスプリング15が後軸13の段部13Eと押圧部材16の外鍔部16Dの間に350g程度の取付時荷重で取り付けられることにより、通常押圧部材16は長手方向後方に付勢されている。しかも押圧部材16の前部内孔16Gには芯タンク4の後部が挿入され、芯タンク4の後端と押圧部材16の押圧面は適宜離間して構成されている。更に、押圧部材16の後部内孔16Hには消しゴム17が嵌合されて取り付けられ、かつ、消しゴム17を覆うノブ18が押圧部材16の後部外面16Iに嵌合される。   After the return spring 15 is externally fitted to the front portion of the pressing member 16, the pressing member 16 is inserted from the rear of the rear shaft 13 with the key 16E of the pressing member 16 aligned with the key groove 13F of the rear shaft 13, and the pressing member 16 is inserted. The protrusion 16B is loosely fitted in the opening window 13C of the rear shaft 13 so as to be slidable in the longitudinal direction. Moreover, since the return spring 15 is mounted between the step portion 13E of the rear shaft 13 and the outer flange portion 16D of the pressing member 16 with a load at the time of mounting of about 350 g, the normal pressing member 16 is normally urged rearward in the longitudinal direction. Yes. Moreover, the rear portion of the lead tank 4 is inserted into the front inner hole 16G of the pressing member 16, and the rear end of the lead tank 4 and the pressing surface of the pressing member 16 are appropriately separated. Further, an eraser 17 is fitted and attached to the rear inner hole 16H of the pressing member 16, and a knob 18 covering the eraser 17 is fitted to the rear outer surface 16I of the pressing member 16.
このように組み立てられた後軸13を前記前軸8の後端より挿入し、後軸13の隆起部13Gを前軸8の凹溝8Fに合わせて後軸13を前進させ、後軸13の突起13Bを前軸8の係止窓8Eに嵌め込み、後軸13を前軸8に取り付ける。この前軸8と後軸13により軸筒を構成する。しかも、前軸8の係止窓8E及び後軸13の突起13Bはクリップ14により隠されるために外観を損なうことはない。また、後軸13の内鍔13Dには前記芯タンク4の後部が挿入されるとともに、前記重量体12はコネクター2の外鍔2Aと後軸13の内鍔13Dにより長手方向の摺動が規制される。   The rear shaft 13 assembled in this way is inserted from the rear end of the front shaft 8, and the rear shaft 13 is advanced by aligning the raised portion 13G of the rear shaft 13 with the concave groove 8F of the front shaft 8. The protrusion 13B is fitted into the locking window 8E of the front shaft 8, and the rear shaft 13 is attached to the front shaft 8. The front shaft 8 and the rear shaft 13 constitute a shaft cylinder. Moreover, the locking window 8E of the front shaft 8 and the protrusion 13B of the rear shaft 13 are hidden by the clip 14, so that the appearance is not impaired. Further, the rear portion of the core tank 4 is inserted into the inner flange 13D of the rear shaft 13, and the weight body 12 is restricted from sliding in the longitudinal direction by the outer flange 2A of the connector 2 and the inner flange 13D of the rear shaft 13. Is done.
以上説明した振出式シャープペンシルは、前軸8と後軸13からなる軸筒を振ることにより生じる重量体12の慣性力によりスプリング7を圧縮してチャック1を前進させ芯3を繰り出す。この時、重量体12の前部12A内面及び後部12C内面と芯タンク4の外面の隙間より重量体12の太径部12E外面と前軸8の内孔8C内面の隙間の方が狭く構成されているので、重量体12が長手方向に摺動する時、重量体12の太径部12E外面と前軸8の内孔8C内面は接触するが、重量体12の前部12A内面あるいは後部12C内面と芯タンク4の外面が接触したり重量体12の前部12A外面あるいは後部12C外面と前軸8の内孔8C内面が接触する恐れはなく、重量体12の前部12Aに構成したコイルスプリング部12Bや重量体12の後部12Cに構成したコイルスプリング部12Dに応力が加えられる心配は全くない。したがって、重量体12の長手方向の摺動を確実に行うことができる。   The swing-out mechanical pencil described above compresses the spring 7 by the inertia force of the weight body 12 generated by swinging the shaft cylinder composed of the front shaft 8 and the rear shaft 13 to advance the chuck 1 and feed the core 3. At this time, the gap between the outer surface of the large-diameter portion 12E of the weight body 12 and the inner surface of the inner hole 8C of the front shaft 8 is narrower than the gap between the inner surface of the front portion 12A and the rear portion 12C of the weight body 12 and the outer surface of the core tank 4. Therefore, when the weight body 12 slides in the longitudinal direction, the outer surface of the large diameter portion 12E of the weight body 12 and the inner surface of the inner hole 8C of the front shaft 8 are in contact, but the inner surface of the front portion 12A or the rear portion 12C of the weight body 12. There is no fear that the inner surface contacts the outer surface of the core tank 4 or the outer surface of the front portion 12A of the weight body 12 or the outer surface of the rear portion 12C and the inner surface of the inner hole 8C of the front shaft 8 contact. There is no concern that stress is applied to the coil spring portion 12D formed on the spring portion 12B or the rear portion 12C of the weight body 12. Therefore, the weight body 12 can be reliably slid in the longitudinal direction.
以下、図6に基づいて本発明の実施例2の振出式シャープペンシルを説明する。尚、図1と同一部材は同一の符号を付してその説明を省略する。先ず、前軸108を透明あるいは着色された透明性を有する合成樹脂で構成し、かつ、前軸108の前部孔108Aは機構部の芯タンク4及びコネクター2が挿通可能に構成する。この前軸108の前部孔108Aより機構部を挿入し、前軸108の前端と前軸108の前部に螺合された先部材9の内段9Aにより連結具6を挾持する。   Hereinafter, the swing-out mechanical pencil according to the second embodiment of the present invention will be described with reference to FIG. In addition, the same member as FIG. 1 attaches | subjects the same code | symbol, and abbreviate | omits the description. First, the front shaft 108 is made of transparent or colored synthetic resin having transparency, and the front hole 108A of the front shaft 108 is configured to allow the core tank 4 and the connector 2 of the mechanism portion to be inserted. The mechanism portion is inserted through the front hole 108A of the front shaft 108, and the connecting tool 6 is held by the inner end 9A of the tip member 9 screwed into the front end of the front shaft 108 and the front portion of the front shaft 108.
また、前軸108には、後端より開口されかつ前記前部孔108Aより太径の後部孔108Dを形成するとともに、前軸108の後部に係止窓108Eを形成する。更に、前軸108の係止窓108Eと対向する位置に後端より長手方向前方に伸びた凹溝108Fを形成する。この前軸108の後部孔108Dに重量体12が摺動可能に内蔵され、この重量体12の貫通孔に芯タンク4が挿入される。後軸113は、着色された不透明の合成樹脂で構成され、後部上側にクリップ114を一体に形成するとともに、太径の後部から前方に伸びて前軸108内に後方から挿入される細径部113Aの長手方向寸法は前軸108の全長の半分以上好ましくは8割程度の長さに構成する。この細径部113Aの後部外周面には前記クリップ114の真下に位置して突起113Bを形成する。更に、細径部113Aの両側部に長手方向に伸びた開口窓を対向して形成し、突起113Bが位置する細径部113Aが適宜弾性変形可能に構成する。また、後軸113の細径部113Aに、突起113Bの反対側に位置しかつ長手方向に伸びた隆起部113Gを形成する。この後軸113には、芯タンク4の横振れを防止するための内鍔113Dが形成されるとともに、後部内側にはリターンスプリング15を当接するための段部113Eが形成される。更に、後軸113の後部孔の上下には前記開口窓と軸心に対して90度ずれた位置にキー溝113Fが対向して形成されている。この後軸113の細径部113Aの円周にわずかに凹陥した凹部を長手方向に長く伸ばして形成し、この凹部に印刷により表示を設ける。   The front shaft 108 is formed with a rear hole 108D that is opened from the rear end and has a diameter larger than that of the front hole 108A, and a locking window 108E is formed at the rear portion of the front shaft 108. Further, a concave groove 108F extending forward in the longitudinal direction from the rear end is formed at a position facing the locking window 108E of the front shaft 108. The weight body 12 is slidably incorporated in the rear hole 108D of the front shaft 108, and the core tank 4 is inserted into the through hole of the weight body 12. The rear shaft 113 is made of a colored opaque synthetic resin, integrally formed with a clip 114 on the upper rear portion, and a small diameter portion that extends forward from the large diameter rear portion and is inserted into the front shaft 108 from the rear. The length in the longitudinal direction of 113A is configured to be more than half of the total length of the front shaft 108, preferably about 80%. A protrusion 113B is formed on the outer peripheral surface of the rear portion of the small-diameter portion 113A so as to be positioned immediately below the clip 114. Further, opening windows extending in the longitudinal direction are formed on both sides of the small-diameter portion 113A so as to face each other, and the small-diameter portion 113A where the projection 113B is located is configured to be appropriately elastically deformable. Further, a raised portion 113G that is located on the opposite side of the projection 113B and extends in the longitudinal direction is formed in the narrow-diameter portion 113A of the rear shaft 113. The rear shaft 113 is formed with an inner flange 113D for preventing the core tank 4 from sideways and a step 113E for abutting the return spring 15 inside the rear portion. Further, a key groove 113F is formed above and below the rear hole of the rear shaft 113 so as to face the opening window at a position shifted by 90 degrees with respect to the axial center. After this, a concave portion slightly recessed in the circumference of the small-diameter portion 113A of the shaft 113 is formed to extend in the longitudinal direction, and a display is provided in the concave portion by printing.
前記後軸113が前軸108の後端より挿入され、後軸113の隆起部113Gが前軸108の凹溝108Fに合わせて後軸113を前進させ、後軸113の突起113Bを前軸108の係止窓108Eに嵌合させ、後軸113を前軸108に取り付ける。この前軸108と後軸113により軸筒を構成する。尚、前軸108の係止窓108E及び後軸113の突起113Bはクリップ114により隠されるために外観を損なうことはない。また、後軸113の内鍔113Dには前記芯タンク4の後部が挿通されるとともに、重量体12はコネクター2の外鍔2Aと後軸113の内鍔113Dとの間を長手方向に摺動可能に構成する。また、重量体12の前部12A内面及び後部12C内面と芯タンク4の外面の隙間より重量体12の太径部12Eと後軸113の細径部113A内面の隙間の方が狭く構成する。   The rear shaft 113 is inserted from the rear end of the front shaft 108, the raised portion 113G of the rear shaft 113 advances the rear shaft 113 in accordance with the concave groove 108F of the front shaft 108, and the protrusion 113B of the rear shaft 113 is moved to the front shaft 108. And the rear shaft 113 is attached to the front shaft 108. The front shaft 108 and the rear shaft 113 constitute a shaft cylinder. Note that the locking window 108E of the front shaft 108 and the protrusion 113B of the rear shaft 113 are hidden by the clip 114, so the appearance is not impaired. The rear portion of the core tank 4 is inserted into the inner flange 113D of the rear shaft 113, and the weight body 12 slides in the longitudinal direction between the outer flange 2A of the connector 2 and the inner flange 113D of the rear shaft 113. Configure as possible. Further, the gap between the inner surface of the front portion 12 </ b> A and the inner surface of the rear portion 12 </ b> C and the outer surface of the core tank 4 is configured so that the gap between the large diameter portion 12 </ b> E of the weight body 12 and the inner surface of the thin portion 113 </ b> A of the rear shaft 113 is narrower.
以上説明した振出式シャープペンシルは、前軸108と後軸113からなる軸筒を振ることにより生じる重量体12の慣性力によりスプリング7を圧縮してチャック1を前進させ芯3を繰り出す。この時、後軸113の細径部113A内面と芯タンク4の間は非常に狭い空間になっているが、重量体12の前部12A内面及び後部12C内面と芯タンク4の外面の隙間より重量体12の太径部12E外面と後軸113の細径部113A内面の隙間の方が狭く構成されているので、重量体12が長手方向に摺動する時、重量体12の太径部12E外面と後軸113の細径部113A内面は接触するが、重量体12の前部12A内面あるいは後部12C内面と芯タンク4の外面が接触したり重量体12の前部12A外面あるいは後部12C外面と後軸113の細径部113A内面が接触する恐れはなく、重量体12の前部12Aに構成したコイルスプリング部12Bや重量体12の後部12Cに構成したコイルスプリング部12Dに応力が加えられる心配は全くない。したがって、重量体12の長手方向の摺動を確実に行うことが出来る。   The swing-out mechanical pencil described above compresses the spring 7 by the inertia force of the weight body 12 generated by swinging the shaft cylinder composed of the front shaft 108 and the rear shaft 113 to advance the chuck 1 and feed the core 3. At this time, the space between the inner surface of the small-diameter portion 113 </ b> A of the rear shaft 113 and the core tank 4 is very narrow, but the clearance between the inner surface of the front portion 12 </ b> A and the inner surface of the rear portion 12 </ b> C of the weight body 12 and the outer surface of the core tank 4. Since the gap between the outer surface of the large-diameter portion 12E of the weight body 12 and the inner surface of the small-diameter portion 113A of the rear shaft 113 is narrower, when the weight body 12 slides in the longitudinal direction, the large-diameter portion of the weight body 12 Although the outer surface of 12E and the inner surface of the small diameter portion 113A of the rear shaft 113 are in contact with each other, the inner surface of the front portion 12A or the rear portion 12C of the weight body 12 is in contact with the outer surface of the core tank 4, or the outer surface of the front portion 12A of the weight body 12 or the rear portion 12C. There is no risk of contact between the outer surface and the inner surface of the small diameter portion 113A of the rear shaft 113, and stress is applied to the coil spring portion 12B formed on the front portion 12A of the weight body 12 and the coil spring portion 12D formed on the rear portion 12C of the weight body 12. No worry to be. Therefore, the weight body 12 can be reliably slid in the longitudinal direction.
尚、本発明は、上記実施例に限定されるものではなく、前軸、後軸、押圧部材といった部材は説明を簡略化するためにそれぞれ1個の部材として図示しているが、それぞれ2個以上の部材を螺合、圧入等により一体化すれば良い。また、コネクターと芯タンクを一体に構成したり、前軸と後軸を一体に構成しても良い。   Note that the present invention is not limited to the above-described embodiment, and the members such as the front shaft, the rear shaft, and the pressing member are illustrated as one member for simplification of explanation, but two members each. The above members may be integrated by screwing, press-fitting, or the like. Further, the connector and the core tank may be configured integrally, or the front shaft and the rear shaft may be configured integrally.
線をコイル状に巻回しかつ前部及び後部にコイルスプリング部を構成した重量体が、確実に長手方向に摺動できるとともに重量体の接触音が少ない振出式シャープペンシルに適用できる。   The weight body in which the wire is wound in a coil shape and the coil spring portion is formed in the front and rear portions can be reliably slid in the longitudinal direction, and can be applied to a swing-out type mechanical pencil with less contact sound of the weight body.
1 チャック
3 芯
4 芯タンク
12 重量体
12A 重量体12の前部
12B 重量体12のコイルスプリング部
12C 重量体12の後部
12D 重量体12のコイルスプリング部
12E 重量体12の太径部
DESCRIPTION OF SYMBOLS 1 Chuck 3 cores 4 core tank 12 Weight body 12A Front part of the weight body 12B Coil spring part of the weight body 12 12C Rear part of the weight body 12D Coil spring part of the weight body 12E Large diameter part of the weight body 12

Claims (1)

  1. 予備の芯を収納する芯タンクと軸筒の間に重量体を摺動可能に設け、振ることにより生じる重量体の慣性力によりチャックを前進させて芯を繰り出す振出式シャープペンシルであって、線をコイル状に巻回して重量体を構成し、その重量体の前部及び後部にコイルスプリング部を構成し、かつ、前部と後部の間に線をコイル状に密着させた太径部を構成し、太径部の外径を前部及び後部の外径より太径に構成し、重量体の前部内面及び後部内面と芯タンクの外面の隙間より重量体の太径部外面と軸筒の内孔内面の隙間の方を狭く構成したことを特徴とする振出式シャープペンシル。 A swing-out type mechanical pencil that slidably installs a weight body between a core tank for storing a spare core and a shaft cylinder, and advances the chuck by the inertial force of the weight body generated by shaking. Is formed into a coiled body to form a weight body, a coil spring part is formed at the front and rear of the weight body, and a large-diameter part in which a wire is closely attached in a coiled shape between the front part and the rear part. The outer diameter of the large-diameter portion is configured to be larger than the outer diameter of the front portion and the rear portion, and the outer surface of the large- diameter portion of the weight body and the shaft from the gap between the front inner surface and the rear inner surface of the weight body and the outer surface of the core tank A swing-out mechanical pencil characterized by a narrower gap on the inner surface of the inner bore of the cylinder .
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