JP4456204B2 - Rotating payout writing instrument - Google Patents

Rotating payout writing instrument Download PDF

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JP4456204B2
JP4456204B2 JP24666399A JP24666399A JP4456204B2 JP 4456204 B2 JP4456204 B2 JP 4456204B2 JP 24666399 A JP24666399 A JP 24666399A JP 24666399 A JP24666399 A JP 24666399A JP 4456204 B2 JP4456204 B2 JP 4456204B2
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writing
inclined surface
slide piece
cam
slide
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JP2001071679A (en
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豊 柴田
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Zebra Co Ltd
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Zebra Co Ltd
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【0001】
【発明の属する技術分野】
本発明は、複数色のボールペンの中芯、あるいは、ボールペンの中芯とシャープペンシルの筆記体等、複数の筆記要素を一本の軸筒内に備え、これら筆記要素を回転操作により順次繰出す回転繰出し式筆記具に関するものである。
【0002】
【従来の技術】
この種の筆記具は、軸筒内の溝に係合されて軸方向にスライドする複数のスライド駒と、それら各スライド駒に接続された各筆記要素と、各スライド駒を軸後方に付勢すべく先端部を軸筒内に係止された各スプリングと、山形カム部を有し軸筒内に回動可能に係合された回転カムとを備える。
【0003】
図3は、第一の従来例を示し、回転カム130を回転させることにより、スライド駒120−1が山形カム部132の上げ側傾斜面132bに押上げられることで軸方向先端側にスライドし、このスライド駒120−1が山形カム部132の頂点に設けられている係合凹部132cに係合して、筆記部142−1の突出状態が維持される(図3(a),(a’)参照)。そして、再び回転カム130を回転させることにより、前記係合が外されて、同スライド駒120−1が山形カム部132の下げ側傾斜面132aを滑り下ろされることで軸方向後端側にスライドし、筆記部142−1が没入される(図3(b),(b’)参照)。また、この筆記部142−1の出没動作と同様にして後続する筆記部142−2が出没動作をする。
ところで、上記動作によれば、筆記具の使用者により完全に筆記部142−1が没入するまで回転カム130が回転されなかった場合、即ち、筆記具の使用者が筆記部142−1を没入させる際に回転カム130を極僅かしか回さなかった場合、図4(a),(a’)に示すように、回転カム130には、スプリングの弾発力によって、先行する筆記部142−1に対応するスライド駒120−1が傾斜面132aに押される力F1と、後続する筆記部142−2に対応するスライド駒120−2が逆側傾斜面132bに押される力F2との二つの力が働く。そして、これら双方の力F1,F2のバランスと、前記先行側及び後続側の各々におけるスライド駒120−1,120−2と傾斜面132a,132bとの摩擦抵抗により、先行するスライド駒120−1が傾斜面132a上の頂部側に位置した状態で回転カム130の回転が停止し、筆記部142−1先端が軸筒先端口111aから僅かに突出されたままの状態になってしまうことがある。
かかる停止状態のままで、筆記具が衣服のポケットに収納された場合には、衣服を筆記部142−1で汚してしまう虞れがあった。
【0004】
そこで、図5(a)及び(b)に示す第二の従来例のように、回転カム130’の山形カム部132’を、片半部側を切落とした形状に形成することで、先行するスライド駒120−1が下げ側傾斜面の途中で停止することがないようにした構造が知られている(実開平01−166578公報参照)。
しかしながら、上記第二の従来例では、山形カム部132’を片半部側を切落とした形状に形成しているために、筆記部を出没させる際の回転操作が一方向に限定されてしまい、筆記具の使い勝手が悪くなってしまう。
【0005】
また、図6(a)〜(e)に示す第三の従来例は、先口内で筆記部同士が干渉しないようにする目的で考案されたものであるが、図示のスライド駒の配置構成によれば、山形カム部132”に二つのスライド駒120−1,120−2が同時に乗り上がっている状態がないため、上述したような力関係のバランスにより、先行するスライド駒120−1が下げ側傾斜面132a”の途中で停止することがない(実開昭61−56092公報参照)。
しかし、この第三の従来例では、山形カム部132”に二つのスライド駒120−1,120−2が同時に乗り上がっている状態になることがないため、山形カム部132”の上げ側傾斜面132b”で後続するスライド駒120−2を押上げる際に、先行するスライド駒120−1により下げ側傾斜面132a”が押されることがない。従って、回転カム130”を回転させる力が先行するスライド駒120−1の押圧により補助されることがなく、筆記部を突出させるための回転操作に大きな荷重を必要するという操作上の問題がある。
【0006】
【発明が解決しようとする課題】
本発明は上記従来事情に鑑みてなされたものであり、その目的とする処は、筆記部を軸筒内に収納する操作を行った際に、筆記部先端が軸筒先端口から突出されたままの状態になってしまうことがない上、筆記部の出没を両方向の回転操作により行うことができ、しかも、その操作を軽い力で行うことができる回転繰出し式筆記具を提供することにある。
【0007】
【課題を解決するための手段】
上記目的を達成するための本発明の技術的手段は、軸筒内に軸方向へスライド可能に装着した複数のスライド駒と、前記各スライド駒に接続された各筆記要素と、前記各スライド駒を軸後方に付勢する各スプリングと、山形カム部を有し前記軸筒内に回動可能に係合された回転カムとを備え、該回転カムを回転させたときに、スライド駒を押上げる前記山形カム部の上げ側傾斜面とスライド駒を滑り下ろす同山形カム部の下げ側傾斜面とによって前記複数の筆記要素の一つを軸筒先端口より出没させるようにした回転繰出し式筆記具において、前記山形カム部は、先行する筆記要素に対応する先行スライド駒が前記下げ側傾斜面上部に移動して、該下げ側傾斜面上部において同筆記要素の筆記部先端を軸筒先端口内に没入させた状態で、後続する筆記要素に対応する後続スライド駒が前記上げ側傾斜面基部に位置するように構成したことを特徴とする。ここで、先行する筆記要素とは、回転カムを一方向に回転させた際に、先行して出没動作をする任意の筆記要素を意味し、後続する筆記要素とは、前記先行する筆記要素に後続して出没動作をする筆記要素を意味する。また、山形カム部の上げ側傾斜面とは、山形カム部の二つの傾斜面の内、回転カムを一方向に回転させた際に、スライド駒を押上げる一方の傾斜面を意味し、山形カム部の下げ側傾斜面とは、同回転においてスライド駒を滑り下ろす他方の傾斜面を意味する。尚、回転カムの回転方向が前記と逆になった場合には、前記上げ側傾斜面と前記下げ側傾斜面も逆になる。上記技術的手段によれば、先行する筆記要素の筆記部先端が軸筒先端口内に没入してから、後続する筆記要素に対応するスライド駒が山形カム部における上げ側傾斜面基部に位置する。従って、筆記具の使用者により完全に筆記部が没入するまで回転カムが回転されなかった場合でも、その回転カムの回転は、スプリングの弾発力によって筆記部先端が軸筒先端口内に完全に没入するまで止まることがない。しかも、先行して没入した筆記要素に対応するスライド駒が下げ側傾斜面上部に位置するため、再度回転カムを回転させて後続する筆記要素を突出させる際に、前記スライド駒が下げ側傾斜面を押す力により、筆記具の使用者が回転カムを回す力が補助される。
【0008】
尚、先行する筆記要素の筆記部先端が軸筒先端口内に没入する際のスライド距離を必要最小限にする手段としては、上記山形カム部は、先行する筆記要素の筆記部先端が軸筒先端口内に没入した直後に、後続する筆記要素に対応するスライド駒に上記上げ側傾斜面基部が位置するように、上記双方の傾斜面がなす角度を設定する。そして、その具体的手段としては、上記筆記要素を3本とし、上記山形カム部の双方の傾斜面がなす角度を45度にするのが好ましい。
【0009】
【発明の実施の形態】
以下、本発明の実施の形態を図面に基づいて説明する。
図1及び2は、本発明に係る回転繰出し式筆記具を示す。
この回転繰出し式筆記具は、軸筒10内に、軸方向にスライドする三本のスライド駒20と、各スライド駒20に接続された各筆記要素40と、回転により各スライド駒20に順次係合する回転カム30と、各スライド駒20を軸後方に付勢する各スプリング50等を備え、クリップ60の回転操作によって回転カム30が回転し各筆記要素40の筆記部42を順次出没させるように構成してある。
【0010】
軸筒10は、図1に示すように、筆記部42を出没させる先端口11aを有する先細筒状の前軸11後端に、筒状の後軸12を同軸に螺着してなる。
後軸12は、その内面先端側に、三つのガイド孔12d’を有する略円板状の係止板12dが該後軸12内を前後に仕切るようにして形成され、各ガイド孔12d’によって各筆記要素40をガイドすると共に、係止板12dの後面が各スプリング50の先端面を係止する。そして、この後軸12の内面後端側には、回転カム30を回動可能に係合する周溝部12bと、同回転カム30の回転角度を制限する凸状のストッパー12cが形成されている。また、この後軸12内面における前記係止板12dと周溝部12bの間には、軸方向に延びるガイド縦溝12aが周方向に対して等間隔に三本形成されている。
【0011】
スライド駒20は、スライド基部21と突状板部22とガイド凸部23とからなる一体の部材であり、後軸12内において周方向に略120°毎に配置されている。
スライド基部21は、他のスライド駒20に隣接する二つの平面部21a,21aと軸筒10内周面に倣う外周面部21bとからなる横断面扇形状を呈し、外周面部21bには突端を後方に向けた突状板部22を一体に有する。
突状板部22は、外周面が後軸12内面に摺接する湾曲状に形成されると共に、後方側が尖形状に形成されている。
ガイド凸部23は、後軸12のガイド縦溝12aに係合する縦長の突起であり、突状板部22の外周面に軸方向に延設されている。
そして、このスライド駒20は、後軸12内でガイド凸部23をガイド縦溝12aに係合させ、回転カム30の回転により軸方向にスライドする。
【0012】
筆記要素40は、インク収容管41の先端に継手43を介して筆記部42(チップ)を接続してなるボールペンのリフィールであり、各スライド駒20のスライド基部21にインク色の異なるものを着脱可能に嵌合してある。また、前記継手43及び筆記部42内には、図示しない逆流防止機構や乾燥防止機構が備えられ、インクの逆流に伴う筆記掠れを防止している。
尚、この筆記要素40は、ボールペンのリフィールに限定されるものでなく、他の筆記具の筆記体、例えばシャープペンシルやサインペンの筆記体であっても構わない。
【0013】
回転カム30は、後端側の筒部31と先端側の山形カム部32とから一体に形成されている。また、この回転カム30の後端には、筒状操作部61の外周にクリップ本体部62を形成してなるクリップ60が、回転カム30と一体に回転すべく嵌合してある。
【0014】
筒部31は、その外周面に、後軸12の周溝部12bに係合する周凸部31aと、回転カム30の回転角度を制限する係止凸部31bとが形成されている。
係止凸部31bは、回転カム30が一方向に回転された際に、三色の筆記要素40が順次出没された後に後軸12のストッパー12cに一方の側面を係止すると共に、回転カム30が他方向に回転された際には、前記三色の筆記要素40が逆の順序で順次出没された後に後軸12のストッパー12cに他方の側面を係止するように、筒部31の外周面に凸状に形成されている。
【0015】
山形カム部32は、後軸12内周面に外周表面を沿わせた正面視山形状を呈し、左右の傾斜面32a,32bの交わる頂点部分に凹状の駒係止部32cが形成され、回転カム30の回転により、一方の傾斜面32a又は32bがスライド駒20を押上げるようにして軸筒10先方(図1における下方)にスライドさせ、そのスライド駒20を駒係止部32cで係止する。また、他方の傾斜面32a又は32bは、前記スライド駒20を滑り下ろすようにして軸筒10後方(図1における上方)にスライドさせる。
【0016】
次に、山形カム部32の構成を詳細に説明する便宜上、図2に示すように、回転カム30を一方向に回転させた際に、先行して出没動作をする任意の筆記要素40と、この筆記要素40に対応する筆記部42及びスライド駒20を、それぞれ筆記要素40−1、筆記部42−1、スライド駒20−1の符号で示し、前記筆記要素40−1に後続して出没動作をする筆記要素40、筆記部42、スライド駒20を、それぞれ筆記要素40−2、筆記部42−2、スライド駒20−2の符号で示す。また、回転カム30の前記方向の回転において、スライド駒20を押上げる山形カム部32の一方の傾斜面(図2における右側の傾斜面)を上げ側傾斜面32bとし、同回転においてスライド駒20を滑り下ろす山形カム部32の他方の傾斜面(図2における左側の傾斜面)を下げ側傾斜面32aとする。
【0017】
山形カム部32は、図2(a’)に示すように、スライド駒20―1が駒係止部32cに係止された状態で、スライド駒20―2が上げ側傾斜面32bの基部から寸法H2離れた筒部31の平坦面31c上に位置すると共に、図2(b)及び(b’)に示すように、筆記要素40−1が前記係止状態から寸法H1後退した際に、スライド駒20−2が上げ側傾斜面32bの基部に位置するように形成されている。尚、双方の傾斜面32a,32bは左右対称に形成されており、回転カム30を左右何れの方向に回転させた場合でも、上記H2が確保されるようにしてある。
【0018】
即ち、この山形カム部32は、先行する筆記要素40−1に対応するスライド駒20−1が、下げ側傾斜面32a上部に移動し、且つ同筆記要素40−1の筆記部42−1先端を軸筒10の先端口11a内に没入させた状態で、後続する筆記要素40−2に対応するスライド駒20−2が、上げ側傾斜面32bの基部に位置するように形成されている。
【0019】
尚、図示例では、寸法H1は、4.7mmに設定されており、筆記要素40−1がこの寸法H1後退することにより、その筆記部42−1先端を先端口11a端面から0.7mm(図2(b)における寸法H3)没入させるようにしてある。また、寸法H2は、筆記要素40−1が寸法H1後退した際に回転カム30が回転する周面上の距離であり、図示例では3.4mmである。
また、図示例では下げ側傾斜面32aと上げ側傾斜面32bとがなす角度αを45°に設定してある。この角度αは、従来品では54°に設定していたが、図示例では、前記従来品よりも鋭角にすることで、上記寸法H2を確保している。
【0020】
そして、本実施の形態では、上記したように各部の寸法を設定することで、先行する筆記要素40−1を後退させる距離が、その筆記部42−1を先端口11a内に没入させるための必要最小限の距離にされている。従って、筆記部42−1の没入直後に、後続する筆記要素40−2に対応するスライド駒20−2が上げ側傾斜面32bの基部に位置する。
【0021】
スプリング50は、係止板12dの後面とスライド駒20との間でインク収容管41の外周に貫挿されており、スライド駒20を軸後方に付勢している。
尚、このスプリング50は、図示例では、スライド駒20が山形カム部32の駒係止部32cに係止されている状態で、セット荷重を100gに設定してある。このセット荷重は従来品が150〜200gであるのに対し低く設定してある。従って、下げ側傾斜面32aと上げ側傾斜面32bとがなす角度αを鋭角にしたことに伴って回転カム30がスライド駒20を押上げる際の回転負荷が増加されるのを、前記スプリング50のセット荷重の低減により相殺し、回転操作が軽い力で行えるようにしている。
【0022】
而して、上記構成の回転繰出し式筆記具によれば、図2(a)に示すように、先行する筆記要素40−1が筆記部42−1を先端口11aから突出させ係止されている状態において、後続する筆記要素40―2に対応するスライド駒20−2は山形カム部32の上げ側傾斜面32b基部から寸法H2離れて筒部31の平坦面31c上に位置する。
そして、回転カム30が図示されるように回転されると、図2(b)に示すように、先行する筆記要素40−1の筆記部42−1先端が先端口11a内に没入し、後続する筆記要素40−2に対応するスライド駒20−2が上げ側傾斜面32b基部に位置する。
【0023】
従って、筆記具の使用者により完全に筆記部42−1が没入するまで回転カム30が回転されなかった場合でも、その回転カム30の回転は、先行する筆記要素40−1の筆記部42−1が先端口11a内に完全に没入するまでスライド駒20−2によって止められることがない。
しかも、先行して没入した筆記要素40−1に対応するスライド駒20−1が下げ側傾斜面32a上部に位置するため、再度回転カム30を回転させて後続する筆記要素40−2を突出させる際、前記スライド駒20−1が下げ側傾斜面32aを押す力により、筆記具の使用者が回転カム30を回す力が補助される。
【0024】
尚、上記作用は、回転カム30を図2に示す方向に回転させた場合で説明しているが、図示と逆方向に回転させた場合についても同様に作用するのは勿論である。
また、本実施の形態においては、スライド駒20及び筆記要素40を三本の場合で説明したが、それ以上の本数を具備する態様又は二本の場合であってもよい。
さらに、本実施の形態の回転カム30を、上記第三の従来例の公報(実開昭61−56092)に開示されているようなキャップ内に具備する構成としても構わない。
【0025】
【発明の効果】
本発明は、以上説明したように構成されているので、以下に記載されるような効果を奏する。
筆記具の使用者により完全に筆記部が没入するまで回転カムが回転されなかった場合でも、先行する筆記要素の筆記部先端が軸筒先端口内に没入するまでは、スプリングの弾発力によって回転カムの回転が止まらないため、筆記部先端が軸筒先端口から突出されたままの状態になってしまうことがない。
その上、山形カム部が二つの傾斜面により筆記部を出没させるため、第二の従来例のように回転カムの回転方向が限定されることがなく、筆記部の出没を両方向の回転操作により行うことができる。
しかも、先行する筆記要素が没入する際にその筆記要素に対応するスライド駒が回転カムの下げ側傾斜面を押すため、後続する筆記要素を突出させる回転力が補助される。よって、出没操作を軽い力で行える回転繰出し式筆記具を提供できる。
【図面の簡単な説明】
【図1】 本発明に係る回転繰出し式筆記具の一例を示す分解斜視図である。
【図2】 同筆記具において筆記部が出没される動作を順次示し、(a)及び(b)は先端部分の断面図、(a’)及び(b’)は回転カムとスライド駒の位置関係を示す拡大展開図で前記(a)及び(b)に各々対応させて示している。
【図3】 第一の従来例において筆記部が出没される動作を順次示し、(a)及び(b)は先端部分の断面図、(a’)及び(b’)は回転カムとスライド駒の位置関係を示す拡大展開図で前記(a)及び(b)に各々対応させて示している。
【図4】 第一の従来例において筆記部が没入する途中て停止した状態を示し、(a)は先端部分の断面図、(a’)はスライド駒と回転カムの位置関係を示す拡大展開図である。
【図5】 第二の従来例の拡大展開図であり、(a)及び(b)に回転カムを回転させた際のスライド駒の状態を順次示す。
【図6】 第三の従来例の拡大展開図であり、(a)〜(e)に回転カムを回転させた際のスライド駒の状態を順次示す。
【符号の説明】
10:軸筒 11a:先端口
20:スライド駒 30:回転カム
32:山形カム部 32a:下げ側傾斜面
32b:上げ側傾斜面 32c:駒係止部
40:筆記要素(リフィール) 42:筆記部(チップ)
50:スプリング
[0001]
BACKGROUND OF THE INVENTION
The present invention comprises a plurality of writing elements, such as a core of a plurality of ballpoint pens, or a ballpoint pen core and a mechanical pencil, in a single cylinder, and these writing elements are sequentially fed out by a rotating operation. The present invention relates to a rotary feeding type writing instrument.
[0002]
[Prior art]
This type of writing instrument is provided with a plurality of slide pieces that slide in the axial direction by engaging with a groove in the shaft cylinder, each writing element connected to each slide piece, and urging each slide piece to the rear of the shaft. Accordingly, each spring is provided with a tip portion locked in the shaft tube, and a rotating cam having a chevron cam portion and rotatably engaged in the shaft tube.
[0003]
FIG. 3 shows a first conventional example. When the rotary cam 130 is rotated, the slide piece 120-1 is pushed up by the rising side inclined surface 132b of the angle cam portion 132, and slides toward the front end in the axial direction. The slide piece 120-1 is engaged with an engagement recess 132c provided at the apex of the angle cam portion 132, and the protruding state of the writing portion 142-1 is maintained (FIGS. 3A and 3A). ')reference). Then, by rotating the rotary cam 130 again, the engagement is disengaged, and the slide piece 120-1 is slid down on the lower side inclined surface 132a of the angle cam portion 132 to slide toward the rear end side in the axial direction. Then, the writing unit 142-1 is immersed (see FIGS. 3B and 3B ′). Further, the subsequent writing unit 142-2 performs an appearance operation in the same manner as the writing operation of the writing unit 142-1.
By the way, according to the above operation, when the rotary cam 130 is not rotated until the writing unit 142-1 is completely immersed by the user of the writing instrument, that is, when the writing instrument user immerses the writing unit 142-1. When the rotating cam 130 is rotated very little, the rotating cam 130 has the leading writing portion 142-1 in the rotating cam 130 due to the spring force of the spring, as shown in FIGS. There are two forces: a force F1 that pushes the corresponding slide piece 120-1 against the inclined surface 132a and a force F2 that pushes the slide piece 120-2 corresponding to the subsequent writing unit 142-2 against the opposite inclined surface 132b. work. The preceding slide piece 120-1 is balanced by the balance between these forces F1 and F2 and the frictional resistance between the slide pieces 120-1 and 120-2 and the inclined surfaces 132a and 132b on each of the preceding side and the following side. However, the rotation of the rotary cam 130 may stop in a state where it is positioned on the top side of the inclined surface 132a, and the tip of the writing portion 142-1 may be slightly protruded from the shaft tube tip port 111a.
When the writing implement is stored in the pocket of the clothes in such a stopped state, there is a possibility that the clothes are soiled by the writing unit 142-1.
[0004]
Therefore, as in the second conventional example shown in FIGS. 5 (a) and 5 (b), the angle cam portion 132 ′ of the rotating cam 130 ′ is formed in a shape in which one half portion side is cut off. There is known a structure in which the slide piece 120-1 to be stopped does not stop in the middle of the downward inclined surface (see Japanese Utility Model Laid-Open No. 01-166578).
However, in the second conventional example, the chevron cam portion 132 ′ is formed in a shape with one half side cut off, so that the rotation operation when the writing portion is projected and retracted is limited to one direction. , The writing instrument becomes unusable.
[0005]
The third conventional example shown in FIGS. 6 (a) to 6 (e) was devised for the purpose of preventing the writing parts from interfering with each other in the front opening, but according to the arrangement of the slide pieces shown in the figure. For example, there is no state in which the two slide pieces 120-1 and 120-2 are riding on the mountain-shaped cam portion 132 ″ at the same time, so that the preceding slide piece 120-1 is lowered on the lower side due to the balance of the force relationship as described above. There is no stop in the middle of the inclined surface 132a ″ (see Japanese Utility Model Publication No. 61-56092).
However, in this third conventional example, since the two slide pieces 120-1 and 120-2 are not on the mountain-shaped cam portion 132 ″ at the same time, the upward-side inclination of the mountain-shaped cam portion 132 ″. When the subsequent slide piece 120-2 is pushed up by the surface 132b ", the lower inclined surface 132a" is not pushed by the preceding slide piece 120-1. Therefore, there is an operational problem that the force for rotating the rotating cam 130 ″ is not assisted by the pressing of the preceding slide piece 120-1 and a large load is required for the rotating operation for projecting the writing unit. .
[0006]
[Problems to be solved by the invention]
The present invention has been made in view of the above-described conventional circumstances, and the objective of the present invention is that when the operation of storing the writing part in the shaft cylinder is performed, the writing part tip is projected from the shaft tube tip port. Another object of the present invention is to provide a rotary pay-out type writing instrument that can be moved up and down by rotating in both directions and that can be operated with a light force.
[0007]
[Means for Solving the Problems]
The technical means of the present invention for achieving the above object includes a plurality of slide pieces that are slidably mounted in an axial direction in a shaft cylinder, each writing element connected to each slide piece, and each slide piece. And a rotating cam that has a chevron cam portion and is rotatably engaged in the shaft cylinder. When the rotating cam is rotated, the slide piece is pressed. In the rotary pay-out type writing instrument in which one of the plurality of writing elements is caused to protrude from the tip end of the shaft cylinder by the rising side inclined surface of the angle cam portion to be raised and the lower side inclined surface of the mountain shape cam portion to slide down the slide piece. In the angle cam portion, the preceding slide piece corresponding to the preceding writing element moves to the upper part of the lower inclined surface, and the writing part tip of the writing element is immersed in the tip of the shaft tube at the upper part of the lower inclined surface. Followed by That subsequent slide piece corresponding to the writing element is characterized by being configured so as to be positioned on the up side inclined surface base. Here, the preceding writing element means an arbitrary writing element that moves in and out in advance when the rotary cam is rotated in one direction, and the succeeding writing element is the preceding writing element. This means a writing element that subsequently moves in and out. In addition, the up-side inclined surface of the angle cam portion means one of the two inclined surfaces of the angle cam portion, and the one inclined surface that pushes up the slide piece when the rotating cam is rotated in one direction. The downward inclined surface of the cam portion means the other inclined surface that slides down the slide piece during the same rotation. When the rotation direction of the rotating cam is reversed, the upside inclined surface and the downside inclined surface are also reversed. According to the above technical means, after the leading end of the writing element of the preceding writing element is immersed in the tip of the shaft tube, the slide piece corresponding to the subsequent writing element is positioned on the upside inclined surface base of the angle cam portion. Therefore, even if the rotary cam is not rotated until the writing part is completely immersed by the user of the writing instrument, the rotation cam rotates so that the tip of the writing part is completely immersed in the end of the shaft tube by the spring force of the spring. Will not stop until In addition, since the slide piece corresponding to the writing element that has been previously immersed is located at the upper part of the lower inclined surface, when the rotating cam is rotated again to project the subsequent writing element, the slide piece is lowered on the lower inclined surface. The force of pushing the button assists the user of the writing instrument to turn the rotating cam.
[0008]
In addition, as a means for minimizing the sliding distance when the leading end of the writing element of the preceding writing element is immersed in the shaft tip end, the above-mentioned chevron cam portion has the leading end of the writing element of the leading writing element. Immediately after immersing in the mouth, the angle formed by the two inclined surfaces is set so that the raised inclined surface base is positioned on the slide piece corresponding to the subsequent writing element. And as the concrete means, it is preferable to make the said writing element into three and to make the angle which both the inclined surfaces of the said chevron cam part make into 45 degree | times.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show a rotary pay-out writing instrument according to the present invention.
This rotary pay-out type writing instrument is sequentially engaged with each slide piece 20 by rotation, three slide pieces 20 that slide in the axial direction, each writing element 40 that is connected to each slide piece 20 in the shaft cylinder 10. The rotating cam 30 and the springs 50 for urging the slide pieces 20 to the rear of the shaft. The rotating cam 30 is rotated by the rotation operation of the clip 60 so that the writing portions 42 of the writing elements 40 are sequentially projected and retracted. It is configured.
[0010]
As shown in FIG. 1, the shaft cylinder 10 is formed by coaxially screwing a cylindrical rear shaft 12 to a rear end of a tapered cylindrical front shaft 11 having a front end port 11 a through which a writing portion 42 is projected and retracted.
The rear shaft 12 is formed with a substantially disc-shaped locking plate 12d having three guide holes 12d ′ at the front end side of the inner surface so as to partition the rear shaft 12 forward and backward. While guiding each writing element 40, the rear surface of the locking plate 12d locks the tip surface of each spring 50. Further, on the rear end side of the inner surface of the rear shaft 12, a circumferential groove portion 12 b that engages the rotary cam 30 in a rotatable manner and a convex stopper 12 c that restricts the rotation angle of the rotary cam 30 are formed. . Further, three guide longitudinal grooves 12a extending in the axial direction are formed at equal intervals in the circumferential direction between the locking plate 12d and the circumferential groove 12b on the inner surface of the rear shaft 12.
[0011]
The slide piece 20 is an integral member composed of a slide base portion 21, a protruding plate portion 22, and a guide convex portion 23, and is arranged in the circumferential direction in the rear shaft 12 approximately every 120 °.
The slide base 21 has a cross-sectional fan shape composed of two flat portions 21a, 21a adjacent to the other slide piece 20 and an outer peripheral surface portion 21b following the inner peripheral surface of the shaft tube 10, and the outer peripheral surface portion 21b has a protruding end rearward. The protruding plate portion 22 is integrally formed.
The projecting plate portion 22 is formed in a curved shape in which the outer peripheral surface is in sliding contact with the inner surface of the rear shaft 12, and the rear side is formed in a pointed shape.
The guide protrusion 23 is a vertically long protrusion that engages with the guide vertical groove 12 a of the rear shaft 12, and extends in the axial direction on the outer peripheral surface of the protruding plate portion 22.
Then, the slide piece 20 engages the guide convex portion 23 with the guide vertical groove 12 a in the rear shaft 12, and slides in the axial direction by the rotation of the rotary cam 30.
[0012]
The writing element 40 is a refill of a ballpoint pen in which a writing portion 42 (chip) is connected to the tip of the ink containing tube 41 via a joint 43, and different ink colors are attached to and detached from the slide base 21 of each slide piece 20. It is possible to fit. In addition, the joint 43 and the writing unit 42 are provided with a backflow prevention mechanism and a drying prevention mechanism (not shown) so as to prevent writing dripping due to the backflow of ink.
The writing element 40 is not limited to the refill of a ballpoint pen, and may be a writing body of another writing tool, for example, a writing body of a mechanical pencil or a sign pen.
[0013]
The rotary cam 30 is integrally formed from a cylindrical portion 31 on the rear end side and an angle cam portion 32 on the front end side. A clip 60 formed by forming a clip main body 62 on the outer periphery of the cylindrical operation portion 61 is fitted to the rear end of the rotary cam 30 so as to rotate integrally with the rotary cam 30.
[0014]
On the outer peripheral surface of the cylindrical portion 31, a circumferential convex portion 31 a that engages with the circumferential groove portion 12 b of the rear shaft 12 and a locking convex portion 31 b that limits the rotation angle of the rotary cam 30 are formed.
When the rotary cam 30 is rotated in one direction, the locking projection 31b locks one side surface to the stopper 12c of the rear shaft 12 after the three-color writing elements 40 are sequentially projected and retracted. When the three-color writing elements 40 are sequentially projected and retracted in the reverse order when the 30 is rotated in the other direction, the other side surface of the cylindrical portion 31 is locked to the stopper 12c of the rear shaft 12. A convex shape is formed on the outer peripheral surface.
[0015]
The chevron cam portion 32 has a mountain shape in front view with the outer peripheral surface along the inner peripheral surface of the rear shaft 12, and a concave piece locking portion 32c is formed at the apex portion where the left and right inclined surfaces 32a and 32b intersect, As the cam 30 rotates, one of the inclined surfaces 32a or 32b pushes up the slide piece 20 and is slid forward (downward in FIG. 1), and the slide piece 20 is locked by the piece locking portion 32c. To do. The other inclined surface 32a or 32b slides the slide piece 20 rearward (upward in FIG. 1) so as to slide down.
[0016]
Next, for the convenience of describing the configuration of the chevron cam portion 32 in detail, as shown in FIG. 2, when the rotary cam 30 is rotated in one direction, an arbitrary writing element 40 that performs a preceding and retracting operation, The writing part 42 and the slide piece 20 corresponding to the writing element 40 are indicated by the reference numerals of the writing element 40-1, the writing part 42-1, and the slide piece 20-1, respectively, and appear after the writing element 40-1. The writing element 40, the writing part 42, and the slide piece 20 which operate | move are shown with the code | symbol of the writing element 40-2, the writing part 42-2, and the slide piece 20-2, respectively. Further, in the rotation of the rotary cam 30 in the above-mentioned direction, one inclined surface (the right inclined surface in FIG. 2) of the angle cam portion 32 that pushes up the slide piece 20 is defined as an upward inclined surface 32b. The other inclined surface (left inclined surface in FIG. 2) of the mountain-shaped cam portion 32 that slides down is defined as a lower-side inclined surface 32a.
[0017]
As shown in FIG. 2 (a ′), the chevron cam portion 32 is configured so that the slide piece 20-2 is disengaged from the base portion of the upward inclined surface 32b in a state where the slide piece 20-1 is locked to the piece locking portion 32c. As shown in FIGS. 2B and 2B ′, when the writing element 40-1 is retracted from the locking state by the dimension H1 while being positioned on the flat surface 31c of the cylindrical portion 31 apart from the dimension H2. The slide piece 20-2 is formed so as to be positioned at the base portion of the raising side inclined surface 32b. Both the inclined surfaces 32a and 32b are formed symmetrically so that H2 is ensured even when the rotating cam 30 is rotated in either the left or right direction.
[0018]
That is, in the angle cam portion 32, the slide piece 20-1 corresponding to the preceding writing element 40-1 moves to the upper part of the lower inclined surface 32a, and the tip of the writing portion 42-1 of the writing element 40-1 The slide piece 20-2 corresponding to the subsequent writing element 40-2 is formed so as to be positioned at the base of the raising-side inclined surface 32b.
[0019]
In the illustrated example, the dimension H1 is set to 4.7 mm. When the writing element 40-1 moves backward by the dimension H1, the tip of the writing part 42-1 is 0.7 mm (from the end face of the tip end 11a). The dimension H3 in FIG. The dimension H2 is a distance on the circumferential surface around which the rotary cam 30 rotates when the writing element 40-1 moves backward by the dimension H1, and is 3.4 mm in the illustrated example.
In the illustrated example, the angle α formed by the lower side inclined surface 32a and the higher side inclined surface 32b is set to 45 °. The angle α is set to 54 ° in the conventional product, but in the illustrated example, the dimension H2 is ensured by making the angle α more acute than the conventional product.
[0020]
And in this Embodiment, by setting the dimension of each part as mentioned above, the distance which retracts the preceding writing element 40-1 makes the writing part 42-1 immerse in the front-end | tip opening 11a. The minimum distance is necessary. Therefore, immediately after the writing unit 42-1 is immersed, the slide piece 20-2 corresponding to the subsequent writing element 40-2 is positioned at the base of the upward-side inclined surface 32 b.
[0021]
The spring 50 is inserted through the outer periphery of the ink containing tube 41 between the rear surface of the locking plate 12d and the slide piece 20, and urges the slide piece 20 rearward of the shaft.
In the illustrated example, the set load of the spring 50 is set to 100 g in a state where the slide piece 20 is locked to the piece locking portion 32c of the angle cam portion 32. This set load is set low compared with 150 to 200 g for the conventional product. Therefore, the rotational load when the rotary cam 30 pushes up the slide piece 20 is increased in accordance with the angle α formed by the lower side inclined surface 32a and the higher side inclined surface 32b being made acute. This is offset by reducing the set load so that the rotating operation can be performed with a light force.
[0022]
Thus, according to the rotary paying-out type writing instrument having the above-described configuration, as shown in FIG. 2A, the preceding writing element 40-1 protrudes from the tip end 11a and is locked. In the state, the slide piece 20-2 corresponding to the subsequent writing element 40-2 is positioned on the flat surface 31c of the cylindrical portion 31 away from the base portion of the rising side inclined surface 32b of the angle cam portion 32 by a dimension H2.
When the rotary cam 30 is rotated as shown in the figure, the leading end of the writing portion 42-1 of the preceding writing element 40-1 is immersed in the leading end 11a as shown in FIG. The slide piece 20-2 corresponding to the writing element 40-2 to be performed is positioned at the base of the raised side inclined surface 32b.
[0023]
Therefore, even when the rotating cam 30 is not rotated until the writing unit 42-1 is completely immersed by the user of the writing instrument, the rotation of the rotating cam 30 is performed by the writing unit 42-1 of the preceding writing element 40-1. Is not stopped by the slide piece 20-2 until it completely immerses in the front end 11a.
Moreover, since the slide piece 20-1 corresponding to the writing element 40-1 that has been immersed in advance is positioned on the lower inclined surface 32a, the rotating cam 30 is rotated again to cause the subsequent writing element 40-2 to protrude. At this time, the force by which the user of the writing instrument rotates the rotating cam 30 is assisted by the force by which the slide piece 20-1 pushes the lower inclined surface 32a.
[0024]
The above operation has been described in the case where the rotating cam 30 is rotated in the direction shown in FIG. 2, but it goes without saying that the same effect can be obtained when the rotating cam 30 is rotated in the direction opposite to that shown in the figure.
Moreover, in this Embodiment, although the slide piece 20 and the writing element 40 were demonstrated in the case of three, the aspect provided with the number beyond it or the case of two may be sufficient.
Furthermore, the rotary cam 30 of the present embodiment may be provided in a cap as disclosed in the third prior art publication (Japanese Utility Model Publication No. 61-56092).
[0025]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained.
Even if the rotating cam is not rotated until the writing part is completely immersed by the user of the writing instrument, the rotating cam is moved by the spring force of the spring until the writing part tip of the preceding writing element is inserted into the shaft end opening. Therefore, the writing part tip does not remain protruding from the tip end of the shaft tube.
In addition, since the angled cam portion causes the writing portion to appear and retract with two inclined surfaces, the rotation direction of the rotating cam is not limited as in the second conventional example, and the writing portion appears and disappears by rotating in both directions. It can be carried out.
In addition, when the preceding writing element is immersed, the slide piece corresponding to the writing element pushes the downward inclined surface of the rotating cam, so that the rotational force for projecting the subsequent writing element is assisted. Therefore, it is possible to provide a rotary payout type writing instrument that can perform the intrusion operation with a light force.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing an example of a rotary pay-out writing instrument according to the present invention.
FIGS. 2A and 2B sequentially show the movement of the writing part in and out of the writing instrument. FIGS. 2A and 2B are cross-sectional views of the tip portion, and FIGS. 2A and 2B show the positional relationship between the rotating cam and the slide piece. In the expanded development view shown, it is shown corresponding to each of the above (a) and (b).
FIGS. 3A and 3B sequentially show the movement of the writing unit in the first conventional example, in which FIGS. 3A and 3B are cross-sectional views of the tip portion, and FIGS. In the enlarged development view showing the positional relationship, (a) and (b) are shown in correspondence with each other.
FIGS. 4A and 4B show a state in which the writing unit stops in the first conventional example, FIG. 4A is a sectional view of the tip portion, and FIG. 4A is an enlarged development showing the positional relationship between the slide piece and the rotating cam. FIG.
FIG. 5 is an enlarged development view of a second conventional example, and (a) and (b) sequentially show the state of a slide piece when a rotating cam is rotated.
FIG. 6 is an enlarged development view of a third conventional example, and (a) to (e) sequentially show the state of the slide pieces when the rotating cam is rotated.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10: Shaft cylinder 11a: Tip port 20: Slide piece 30: Rotating cam 32: Yamagata cam part 32a: Lower side inclined surface 32b: Raised side inclined surface 32c: Piece latching part 40: Writing element (refill) 42: Writing part (Chip)
50: Spring

Claims (3)

軸筒内に軸方向へスライド可能に装着した複数のスライド駒と、前記各スライド駒に接続された各筆記要素と、前記各スライド駒を軸後方に付勢する各スプリングと、山形カム部を有し前記軸筒内に回動可能に係合された回転カムとを備え、該回転カムを回転させたときに、スライド駒を押上げる前記山形カム部の上げ側傾斜面とスライド駒を滑り下ろす同山形カム部の下げ側傾斜面とによって前記複数の筆記要素の一つを軸筒先端口より出没させるようにした回転繰出し式筆記具において、
前記山形カム部は、先行する筆記要素に対応する先行スライド駒が前記下げ側傾斜面上部に移動して、該下げ側傾斜面上部において同筆記要素の筆記部先端を軸筒先端口内に没入させた状態で、後続する筆記要素に対応する後続スライド駒が前記上げ側傾斜面基部に位置するように構成したことを特徴とする回転繰り出し式筆記具。
A plurality of slide pieces mounted in the shaft cylinder so as to be slidable in the axial direction, each writing element connected to each slide piece, each spring for biasing each slide piece to the rear of the shaft, and a chevron cam portion A rotating cam that is rotatably engaged in the shaft cylinder, and slides the sliding piece with the inclined surface on the raising side of the angle cam portion that pushes up the sliding piece when the rotating cam is rotated. In the rotary payout-type writing instrument in which one of the plurality of writing elements is projected and retracted from the tip end of the shaft cylinder by the downward inclined surface of the mountain-shaped cam portion to be lowered,
In the angle cam portion, the preceding slide piece corresponding to the preceding writing element moves to the upper part of the lower inclined surface, and the tip of the writing part of the writing element is immersed in the tip of the shaft tube at the upper part of the lower inclined surface. In the state, the rotary slide-type writing instrument is configured such that the subsequent slide piece corresponding to the subsequent writing element is positioned at the base of the upside inclined surface.
前記回転カムは、前記山形カム部の前記上げ側傾斜面基部までの平坦面を備え、
前記先行スライド駒が前記山形カム部の頂点部分に位置する状態での前記後続スライド駒の前記平坦面上の位置から前記上げ側傾斜面基部までの距離を、前記先行する筆記要素の筆記部先端が前記軸筒先端口内に収まるのに必要な最小限の後退距離に応じて設定したことを特徴とする請求項1に記載された回転繰出し式筆記具。
The rotating cam includes a flat surface up to the raised-side inclined surface base of the angle cam portion,
The distance from the position on the flat surface of the subsequent slide piece to the base of the upside inclined surface in a state where the preceding slide piece is located at the apex portion of the angle cam portion, the tip of the writing portion of the preceding writing element is 2. The rotary payout type writing instrument according to claim 1, wherein the rotary feeding type writing instrument is set according to a minimum receding distance necessary to fit in the tip end of the shaft cylinder .
前記山形カム部の双方の傾斜面がなす角度を設定することで前記上げ側傾斜面基部までの距離を確保することを特徴とする請求項2記載の回転繰出し式筆記具。The rotary pay-out type writing instrument according to claim 2 , wherein a distance to the upside inclined surface base is secured by setting an angle formed by both inclined surfaces of the angle cam portion .
JP24666399A 1999-08-31 1999-08-31 Rotating payout writing instrument Expired - Lifetime JP4456204B2 (en)

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JP2006272666A (en) * 2005-03-28 2006-10-12 Kotobuki & Co Ltd Rotatingly delivering type writing utensil
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