JP2002019378A - Mechanical pencil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mechanical pencil which can avoid a trouble in which built-in leads are scattered by pulling out a case for the refills under a condition that the chuck side is downward by mistake and prevents colored leads for the mechanical pencil from being broken when the colored leads are supplemented and easily performs discrimination of the colors of the leads and erasing and exhibits excellent displaying properties. SOLUTION: In a knock type mechanical pencil in which the front part of a case body of the case for the refills is removably bonded with a shaft joint provided on the back end of the chuck. the case for the refills is inserted into a cylindrical part 11 of the shaft joint 8 from the back end of the shaft cylinder 1 under a condition that the chuck 5 side faces upward and an elastic piece 11s is deformed outward and a projected part 11b is fitted into the channel part 16a of the case body 16 and the case for the refills is easily removably hooked to the shaft joint 8, and when the chuck side is made downward under that condition, the cylindrical body 12 is slidably moved by its own weight on the outer peripheral part on which the elastic piece 11a and the projected part 11b are positioned and deformation of the elastic piece is avoided to make it possible to strongly fix the case for the refills to the shaft joint 8.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【産業上の利用分野】本発明は、主として着色シャープ
芯を使用したノック式シャープペンシルの改良に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a knock mechanical pencil mainly using a colored sharp core.

【０００２】[0002]

【従来の技術】チャックの後端に軸継ぎ手が設けられ、
その軸継ぎ手の後端に芯ケースが着脱可能に止着される
所謂芯カートリッジ式のシャープペンシルは公知であ
る。又、従来の鉛筆芯は、大きく分けて以下の４種類の
製造方法に分類できるが、着色シャープ芯として用いる
場合、いずれも欠点を有している。すなわち、2. Description of the Related Art A shaft joint is provided at the rear end of a chuck.
A so-called lead cartridge type mechanical pencil in which a lead case is detachably fastened to the rear end of the shaft coupling is known. Conventional pencil leads can be roughly classified into the following four types of manufacturing methods, but when used as a colored sharp lead, all have drawbacks. That is,

【０００３】（１）着色剤として黒鉛、結合材として有
機物質、粘土等を主材とし、これらを混練、成形後、焼
成して得られる焼成鉛筆芯。この製法により得られた鉛
筆芯は最近はシャープペンシル用芯に於いても十分な実
用強度に達し、消しゴムによる消去も可能な鉛筆芯とし
て知られている。しかしながら、使用する黒鉛及び焼成
された炭素物質の色から黒以外の鉛筆芯は製造不可能な
欠点がある。[0003] (1) A fired pencil lead obtained by kneading, molding, and then firing the mixture, which comprises graphite as a coloring agent, an organic substance, clay or the like as a binder. The pencil lead obtained by this method has recently reached a sufficient practical strength even for a pencil lead, and is known as a pencil lead that can be erased with an eraser. However, there is a drawback that a pencil lead other than black cannot be manufactured due to the colors of graphite and calcined carbon material used.

【０００４】（２）ワックス類、結合材、体質材、顔料
等を混練、成形して得られる非焼成鉛筆芯。この製法に
よると多種類の有機顔料が使用可能で耐光性、耐候性が
良く、鮮やかな色相の色鉛筆芯が得られる。しかしなが
ら、この色鉛筆芯は非焼成で、主に有機結合材による結
合に頼っているので、シャープペンシル用芯とした場合
には十分な強度が得られず、又、ワックス類を含むため
消しゴムでは消去できない欠点がある。(2) A non-fired pencil lead obtained by kneading and molding a wax, a binder, a filler, a pigment, and the like. According to this production method, various kinds of organic pigments can be used, light resistance and weather resistance are good, and a color pencil lead having a vivid hue can be obtained. However, this colored pencil core is not fired and relies mainly on bonding with an organic binder. Therefore, when it is used as a mechanical pencil lead, sufficient strength cannot be obtained, and since it contains waxes, it cannot be erased with an eraser. There are drawbacks that can not be done.

【０００５】（３）撥水撥油性物質、結合材、体質材、
顔料等を混練、成形し、更に撥水撥油性物質周辺にでき
る開気孔に油脂類等を含浸して得られる非焼成鉛筆芯。
この製法によると、含浸する油脂類として常温で液体の
オイル等を選択した場合には、上記（１）と同じ程度に
消しゴムで容易に消去できる色鉛筆芯の製造が可能であ
る。しかしながら、有機顔料を使用して鮮やかな色相の
色鉛筆芯とする場合には、顔料の耐熱性から使用できる
結合材が有機高分子物質等に限定されるため、シャープ
ペンシル用等の細芯とした場合に十分な強度が得られな
い欠点がある。(3) Water- and oil-repellent substances, binders, body materials,
A non-fired pencil lead obtained by kneading and molding a pigment or the like, and further impregnating the open pores formed around the water / oil repellent substance with oils and fats.
According to this production method, when a liquid oil or the like at room temperature is selected as the oils and fats to be impregnated, it is possible to produce a colored pencil lead that can be easily erased with an eraser to the same extent as in (1) above. However, in the case of using a color pencil lead of a vivid hue using an organic pigment, a binder that can be used is limited to an organic polymer substance or the like due to the heat resistance of the pigment, and thus a fine lead such as for a mechanical pencil is used. In this case, there is a disadvantage that sufficient strength cannot be obtained.

【０００６】（４）窒化ホウ素、粘土、有機物質等を混
練、成形、焼成して得られた淡色若しくは白色焼成多孔
質鉛筆芯に更に染料インクを含浸して得られる鉛筆芯。
この製法によって得られた鉛筆芯による描線は消しゴム
で消去できる。しかしながら、粘土を結合材としている
ため、上記（１）の芯と比較すると強度は十分といえな
い。(4) A pencil lead obtained by impregnating a light-colored or white fired porous pencil lead obtained by kneading, molding and firing boron nitride, clay, an organic substance and the like with a dye ink.
The line drawn by the pencil lead obtained by this method can be erased with an eraser. However, since clay is used as the binder, the strength is not sufficient as compared with the core of the above (1).

【０００７】又、（４）の改良として、少なくとも体質
材と有機質の賦形材を含む配合組成物を混練、押出成
形、非酸化性雰囲気で焼成することにより、該有機質の
賦形材が炭化された炭化物をバインダーとする第１焼成
芯体を形成し、該第１焼成芯体を酸化雰囲気中で加熱し
て炭化物のバインダーを酸化除去させた少なくとも体質
材からなる第２焼成芯体を形成し、該第２焼成芯体の気
孔内に、ペルヒドロポリシラザン含有液を含浸し、窒素
雰囲気等の不活性雰囲気中又はアンモニアガス雰囲気中
での熱処理により窒化珪素を生成させた第３焼成芯体を
形成し、該第３焼成芯体を耐光性、耐候性に優れた着色
剤で着色した高強度焼成シャープ芯が得られている。得
られた第３焼成芯体は、結合材としての窒化珪素が芯体
中に微細で均一に分散して生成するものとなり、更に体
質材が高配向しているため少量の窒化珪素の生成で芯体
の強度を発現しやすく、筆記時の芯体の崩れも均一であ
る。[0007] As an improvement of (4), by kneading, extruding and baking in a non-oxidizing atmosphere a compounded composition containing at least a body material and an organic excipient, the organic excipient is carbonized. Forming a first fired core using the obtained carbide as a binder, and heating the first fired core in an oxidizing atmosphere to form a second fired core made of at least a constitutional material by oxidizing and removing the binder of the carbide; Then, a perhydropolysilazane-containing liquid is impregnated in the pores of the second fired core, and silicon nitride is generated by heat treatment in an inert atmosphere such as a nitrogen atmosphere or an ammonia gas atmosphere. And a high-strength fired sharp core obtained by coloring the third fired core with a coloring agent having excellent light resistance and weather resistance is obtained. In the obtained third fired core, silicon nitride as a binder is finely and uniformly dispersed in the core, and furthermore, since the body material is highly oriented, a small amount of silicon nitride is produced. It is easy to develop the strength of the core, and the collapse of the core during writing is uniform.

【０００８】しかしながら、着色シャープ芯は実用レベ
ルに達したものの、黒色のシャープ芯に比較すれば芯の
強度と消しゴムでの消去性は十分とはいえない。又、芯
自体の色調と筆記した色調の差異や近似した色の差別化
など、シャープペンシルとして如何に容易な種別をする
かの問題がある。[0008] However, although the colored sharp core has reached a practical level, the strength of the core and the erasability with an eraser are not sufficient as compared with the black sharp core. Also, there is a problem of how easy to classify as a mechanical pencil, such as the difference between the color tone of the core itself and the written color tone and the differentiation of similar colors.

【０００９】[0009]

【発明が解決しようとする課題】本発明は、誤ってチャ
ック側下向きで替え芯ケースを引き抜いて、内蔵芯が飛
散してしまうトラブルを回避し、また着色シャープ芯の
補充時に於ける折損防止と芯色の識別が容易でディスプ
レイ性に優れたシャープペンシルを提供可能とする。SUMMARY OF THE INVENTION The present invention avoids the problem of accidentally pulling out the refill lead case downward on the chuck side and causing the built-in lead to scatter, and also prevents breakage when refilling the colored sharp lead. It is possible to provide a mechanical pencil which is easy to identify a core color and has excellent display properties.

【００１０】[0010]

【課題を解決するための手段】本発明は、上記課題を達
成する為に以下の構成を有する。請求項１に記載のシャ
ープペンシルは、軸筒の先端にスプリングで後方に引き
込まれるように設けられたチャックと、そのチャックの
後端に設けられた軸継ぎ手に替え芯ケースのケース本体
前方部が着脱可能に結合されてなるノック式のシャープ
ペンシルに於いて、上記軸継ぎ手後方の筒部の側面に、
所要箇所で筒部の内方に向かって突部を有した弾性片が
設けられ、その筒部の外周に筒体が遊嵌され、筒体が筒
部に対し自重方向に摺動自在となされ、また上記ケース
本体前方部の周面に溝部が設けられて、チャック側上向
きの状態で替え芯ケースが軸筒の後端から軸継ぎ手の筒
部内に挿入され、上記弾性片が外方に変形されると共に
突部がケース本体の溝部に嵌入して軸継ぎ手に対し替え
芯ケースが着脱容易に係止され、その状態でチャック側
下向きとした時に、弾性片及び突部が位置する外周部に
上記筒体が自重で摺動して、弾性片の変形が阻止される
ことで軸継ぎ手に対し替え芯ケースが強固に固定可能と
なる。The present invention has the following arrangement to achieve the above object. The mechanical pencil according to claim 1 is provided with a chuck provided at the tip of the barrel so as to be pulled backward by a spring, and a shaft joint provided at the rear end of the chuck. In the knock type mechanical pencil that is detachably connected, on the side of the cylinder part behind the shaft joint,
An elastic piece having a protruding portion toward the inside of the cylindrical portion is provided at a required portion, and the cylindrical body is loosely fitted on the outer periphery of the cylindrical portion, and the cylindrical body is slidable in the direction of its own weight with respect to the cylindrical portion. Also, a groove is provided on the peripheral surface of the front part of the case main body, and the refill lead case is inserted into the shaft joint from the rear end of the shaft cylinder in a state where the chuck side is upward, and the elastic piece is deformed outward. When the projection is fitted into the groove of the case body and the refill lead case is easily locked to and detached from the shaft joint, and the chuck is turned downward in this state, the elastic piece and the projection are located on the outer peripheral portion. Since the cylindrical body slides under its own weight and deformation of the elastic piece is prevented, the replacement lead case can be firmly fixed to the shaft coupling.

【００１１】請求項２に記載の発明に係るシャープペン
シルは、請求項１に記載のシャープペンシルに於いて、
替え芯ケース内に、多孔質の焼成芯体に染料あるいは顔
料インクを含浸させて消しゴムで筆記描線が容易に消去
可能となる着色シャープ芯が内蔵されると共に、替え芯
ケースを着色シャープ芯で筆記した色調と同系の着色あ
るいは着色透明として設け、軸筒の外部から替え芯ケー
スの全体あるいは一部が視認可能となるように設けられ
てなる。A mechanical pencil according to a second aspect of the present invention is the mechanical pencil according to the first aspect,
In the extra lead case, a porous burned core is impregnated with dye or pigment ink, and an eraser is used to build a colored sharp lead that can be easily erased. It is provided so as to be colored or colored and transparent similar to the above-mentioned color tone, so that the whole or a part of the refill case can be visually recognized from the outside of the barrel.

【００１２】[0012]

【実施例】実施例について図面を参照して説明すると、
図１乃至図３は、本発明の一実施例であるノック式のシ
ャープペンシルを示しており、チャック５はその先端外
周部に締め具７を遊嵌した後にその後端側から軸筒１の
チャック挿通孔に挿通され、チャック後端部外周の係止
部６は軸継ぎ手８先端の軸部９に設けた連結孔に係止し
ている。Embodiments will be described with reference to the drawings.
FIGS. 1 to 3 show a knocking mechanical pencil according to an embodiment of the present invention. A chuck 5 has a fastener 7 loosely fitted to the outer peripheral portion of a tip thereof and then a chuck of the barrel 1 from the rear end side. The engaging portion 6 is inserted through the insertion hole, and the engaging portion 6 on the outer periphery of the rear end of the chuck is engaged with a connecting hole provided in the shaft portion 9 at the tip of the shaft joint 8.

【００１３】軸継ぎ手８と軸筒１の間にはスプリング１
３が張架され、締め具７が軸筒１先端に当接し、チャッ
ク５を閉じて着色シャープ芯１４を把持している。又、
軸筒１は透明な樹脂成形品であり、その先方部には先端
に先端パイプ３を固着した口金２が螺着されている。
又、軸筒１の側面に窓部を穿設すれば、軸筒１が不透明
であっても軸筒内を可視できる。A spring 1 is provided between the shaft coupling 8 and the shaft cylinder 1.
3, the fastener 7 is in contact with the tip of the barrel 1, the chuck 5 is closed and the colored sharp core 14 is gripped. or,
The barrel 1 is a transparent resin molded product, and a base 2 to which a tip pipe 3 is fixed is screwed to a tip of the barrel.
Further, if a window is formed in the side surface of the barrel 1, the inside of the barrel can be seen even if the barrel 1 is opaque.

【００１４】また図１、図３に示されるように、上記軸
継ぎ手８後方の筒部１１の側面に、所要箇所で切り溝１
１ｃを設けて筒部１１の内方に向かって突部１１ｂを一
体に有した弾性片１１ａが設けられ、さらに筒部１１の
前端に段部１１ｅが、後端に傘状の鍔部を有した係止部
１１ｄが設けられて、係止部を弾性変形させた状態で筒
部１１の外周に筒体１２が遊嵌され、筒体１２が段部１
１ｅと係止部１１ｄの間に於いて、筒部１１に対し自重
方向に摺動自在となされている。また筒体１２は、その
大きさや、容易に形成できることから適度な自重を有し
た金属製の筒体と成すことが望ましいが、基本的には材
質などが制限されるものではない。また係止部１１ｄを
適度な弾性変形で縮径できるように後端面に所要箇所の
切り溝を設けることができる。As shown in FIGS. 1 and 3, a cut groove 1 is formed on a side surface of the cylindrical portion 11 behind the shaft joint 8 at a required position.
1c, an elastic piece 11a integrally having a protruding portion 11b toward the inside of the cylindrical portion 11 is provided. Further, a step portion 11e is provided at a front end of the cylindrical portion 11, and an umbrella-shaped flange portion is provided at a rear end. The cylindrical body 12 is loosely fitted to the outer periphery of the cylindrical part 11 in a state where the cylindrical part 11 is elastically deformed.
Between the locking portion 1e and the locking portion 11d, the cylinder 11 is slidable in the direction of its own weight. The cylindrical body 12 is desirably formed of a metal cylindrical body having an appropriate weight due to its size and easy formation, but the material is basically not limited. Further, a cut groove at a required portion can be provided on the rear end surface so that the locking portion 11d can be reduced in diameter by appropriate elastic deformation.

【００１５】一方、図５に示すように、替え芯ケース１
５は、ケース本体１６の前方部外周に径方向の溝部１６
ａが形成され、開口部を閉塞する状態で前端孔に消しゴ
ム１８が装着されている。（図示された実施例では、消
しゴム１８がホルダー１９に保持されると共にホルダー
１９を介して装着されている。） 又、ケース本体１６内に着色シャープ芯などの内蔵芯２
０が挿入されて、さらにケース本体１６の後方部に鍔部
１６ｂとさらに後方に軸部１６ｃが設けられ、その軸部
１６ｃの外周に凹凸部などよりなる係止部１６ｄが形成
されて、軸部１６ｃの外周部にキャップ１７がやはり係
止部１６ｄと係合する凹凸部を備えて着脱可能に止着さ
れている。On the other hand, as shown in FIG.
5 is a radial groove 16 on the outer periphery of the front part of the case body 16.
a is formed, and an eraser 18 is attached to the front end hole while closing the opening. (In the illustrated embodiment, the eraser 18 is held by the holder 19 and is mounted via the holder 19.) Further, the built-in core 2 such as a colored sharp core is provided in the case body 16.
0 is further inserted, a flange portion 16b is provided on the rear portion of the case main body 16, and a shaft portion 16c is further provided on the rear portion. A locking portion 16d made of an uneven portion or the like is formed on the outer periphery of the shaft portion 16c. A cap 17 is provided on the outer peripheral portion of the portion 16c so as to be provided with an uneven portion which also engages with the locking portion 16d, and is detachably fastened.

【００１６】また替え芯ケー１５は、図４に示すように
前方部を上に向けた状態で消しゴム１８を離脱し、口金
２を上に向けた状態で軸筒１の後端から挿入されて、軸
継ぎ手８の筒部１１に挿入される。（図３参照）（尚、
この状態では図４のように消しゴム１８は止着されてい
ない。） 以上で、筒部１１内にケース本体１６の前端部が装着さ
れ、弾性片１１ａが外方に変形されると共に突部１１ｂ
がケース本体１６の溝部１６ａに嵌入して軸継ぎ手８に
対し替え芯ケース１５が着脱容易に係止される。（その
とき、筒体１２の後端が係止部１１ｄに当接して弾性片
の変形が自由となっている。）尚、このときの係止力
は、軸部１６ｃの外周部にキャップ１７が係止する力よ
り十分に弱く設定されることが望ましい。As shown in FIG. 4, the refill core case 15 separates the eraser 18 with the front part facing upward, and is inserted from the rear end of the barrel 1 with the base 2 facing upward. , Is inserted into the cylindrical portion 11 of the shaft coupling 8. (See FIG. 3)
In this state, the eraser 18 is not fixed as shown in FIG. As described above, the front end of the case body 16 is mounted in the cylindrical portion 11, the elastic piece 11a is deformed outward, and the protrusion 11b is formed.
Fits into the groove 16 a of the case body 16, and the replacement lead case 15 is easily locked to and removed from the shaft coupling 8. (At this time, the rear end of the cylindrical body 12 abuts on the locking portion 11d to allow the elastic piece to be freely deformed.) At this time, the locking force is applied to the outer periphery of the shaft 16c by the cap 17. Is desirably set sufficiently lower than the locking force.

【００１７】上記の状態からチャック側下向きとした時
に、弾性片１１ａ及び突部１１ｂが位置する外周部に筒
体１２が自重で摺動して、弾性片１１ａの変形が阻止さ
れることで軸継ぎ手８に対し替え芯ケース１５が強固に
固定可能となる。（尚、この状態でケース本体１６の後
端孔に消しゴム１８が止着される。）When the chuck 12 is turned downward from the above state, the cylindrical body 12 slides by its own weight on the outer peripheral portion where the elastic pieces 11a and the protrusions 11b are located, thereby preventing deformation of the elastic pieces 11a. The extra lead case 15 can be firmly fixed to the joint 8. (In this state, the eraser 18 is fixed to the rear end hole of the case body 16.)

【００１８】またケース本体１６は、着色シャープ芯で
筆記した色調と同系の着色あるいは着色透明として設け
られている。又、消しゴム１８を着色シャープ芯で筆記
した色調と同色とすれば消した時に消しゴムの汚れが目
立たないだけでなくディスプレイ性も良くなる。The case body 16 is provided as a color or a transparent color similar to the color tone written with a colored sharp core. Further, if the eraser 18 is made to have the same color as the color tone written with the colored sharp core, when the eraser is erased, not only is the stain of the eraser inconspicuous but also the display performance is improved.

【００１９】[0019]

【作用】本発明のシャープペンシルは、チャック側を上
向きにしたときだけ替え芯ケース１５が離脱可能となる
ので、内蔵芯を誤って飛散させてしまう問題が回避でき
る。尚、図２に示される状態では、キャップ１７を掴ん
で替え芯ケースを抜くので、キャップを螺合と成すか、
軸部１６ｃの外周部にキャップ１７が係止する力を替え
芯ケースを抜く力より十分に強く設定する必要がある
が、例えば図２に於いて、鍔部１６ｂが軸筒１の後端面
から突き出ていれば鍔部１６ｂに指をかけて替え芯ケー
スを抜くことが可能となるので、キャップの係止力を無
関係とすることも可能である。According to the mechanical pencil of the present invention, the refill case 15 can be detached only when the chuck side is directed upward, so that the problem of accidentally scattering the built-in core can be avoided. In the state shown in FIG. 2, the cap 17 is grasped and the replacement lead case is pulled out.
It is necessary to set the force by which the cap 17 is locked to the outer peripheral portion of the shaft portion 16c sufficiently higher than the force of pulling out the lead case, but, for example, in FIG. If it protrudes, the replacement lead case can be pulled out by putting a finger on the flange 16b, so that the locking force of the cap can be made irrelevant.

【００２０】また軸筒１を透明とし、ケース本体１６を
芯の筆記した色調と同じ着色とすれば、芯自体の色調と
筆記した色調の差異や近似した色の差別化が容易に識別
できる。又、ディスプレイ性に優れている。又、ケース
本体１６を透明あるいは着色透明とすれば芯の存在を確
認することができる。Further, if the barrel 1 is made transparent and the case body 16 is colored the same as the written color tone of the core, the difference between the color tone of the core itself and the written color tone and the differentiation between similar colors can be easily identified. Also, it has excellent display properties. If the case body 16 is transparent or colored and transparent, the presence of the core can be confirmed.

【００２１】又、軸継ぎ手８に替え芯ケース１５を着脱
可能に設けることによって、着色シャープ芯とその芯に
対する消去性の良い消しゴムの組み合わせが特定可能と
なり、更に芯の性質に適したチャック機構部の組み合わ
せが特定可能となる。又、特定ユニットとして芯単体で
の補充を行わないように成すことで、芯補充時に折れや
すい芯を指で摘んで芯ケースに挿入する必要がなくなり
芯の折損の問題が解消できる。従って、任意のシャープ
ペンシルに着色シャープ芯が搭載される場合に対し、芯
の強度や消しゴムの消去性が十分でない点が解決され
る。Further, by providing the refillable lead case 15 detachably on the shaft coupling 8, it is possible to specify a combination of a colored sharp lead and an eraser having good erasability for the lead, and a chuck mechanism suitable for the properties of the lead. Can be specified. In addition, since the replenishment of the core alone is not performed as a specific unit, it is not necessary to pick a fragile core with a finger and insert the core into the core case at the time of replenishing the core, thereby eliminating the problem of breakage of the core. Therefore, it is possible to solve the problem that the strength of the lead and the erasability of the eraser are not sufficient when a colored sharp lead is mounted on an arbitrary mechanical pencil.

【００２２】又、消しゴム１８をホルダー１９などを介
して替え芯ケース１５に装着すれば、消しゴムが消耗し
てもケース本体１６前端の開口部をホルダー１９で閉塞
することが容易となり、替え芯ケース１５を交換して、
外した替え芯ケースを内蔵芯が脱落しない状態で保管す
ることが可能である。Further, if the eraser 18 is mounted on the extra lead case 15 via the holder 19 or the like, the opening at the front end of the case body 16 can be easily closed by the holder 19 even if the eraser is worn out. Replace 15
The removed refill case can be stored in a state where the built-in core does not fall off.

【００２３】[0023]

【発明の効果】本発明のシャープペンシルの構成及び作
用は以上の如くであり、誤ってチャック側下向きで替え
芯ケースを引き抜いて、内蔵芯が飛散してしまうトラブ
ルを回避し、また着色シャープ芯の補充時に於ける折損
防止と消しゴムでの消去性を確実なものとすることも可
能となる。又、多種の芯が替え芯ケース単位で容易に交
換でき、且つ芯種と芯色の識別や名入れなどの表示が容
易となる効果を奏する。The construction and operation of the mechanical pencil according to the present invention are as described above. A trouble in which the replacement lead case is accidentally pulled downward on the chuck side and the built-in lead is scattered can be avoided. It is also possible to prevent breakage at the time of replenishment and ensure erasability with an eraser. Also, there is an effect that various kinds of cores can be easily exchanged in replacement core case units, and display such as identification of the core type and the core color, name entry, and the like is facilitated.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明の一実施例であるシャープペンシルの前
半部を示す一部非断面の縦断面図である。FIG. 1 is a partially non-sectional longitudinal sectional view showing a first half of a mechanical pencil according to an embodiment of the present invention.

【図２】本発明の一実施例であるシャープペンシルの後
半部を示す縦断面図である。FIG. 2 is a longitudinal sectional view showing a rear half of a mechanical pencil according to one embodiment of the present invention.

【図３】チャック側を上に向けて、替え芯ケースを着脱
する状態を示した図である。FIG. 3 is a view showing a state in which a refill lead case is attached and detached with the chuck side facing upward.

【図４】前端孔を開口した状態の替え芯ケースの断面図
である。FIG. 4 is a cross-sectional view of the refill lead case with a front end hole opened.

【図５】替え芯ケースの保管状態を示した断面図であ
る。FIG. 5 is a sectional view showing a storage state of the refill case.

【符号の説明】[Explanation of symbols]

１ 軸筒 ２ 口金 ３ 先端パイプ ４ 保持チャック ５ チャック ６ 係止部 ７ 締め具 ８ 軸継ぎ手 ９ 軸部 １０ 芯ガイド １１ 筒部 １１ａ 弾性片 １１ｂ 突部 １１ｃ 切り溝 １１ｄ 係止部 １１ｅ 段部 １２ 筒体 １３ スプリング １４ 着色シャープ芯 １５ 替え芯ケース １６ ケース本体 １６ａ 溝部 １６ｂ 鍔部 １６ｃ 軸部 １６ｄ 係止部 １７ キャップ １８ 消しゴム １９ ホルダー ２０ 内蔵芯 DESCRIPTION OF SYMBOLS 1 Shaft cylinder 2 Cap 3 Tip pipe 4 Holding chuck 5 Chuck 6 Locking part 7 Fastener 8 Shaft joint 9 Shaft part 10 Core guide 11 Tube part 11a Elastic piece 11b Protrusion part 11c Cut groove 11d Lock part 11e Step part 12 cylinder Body 13 Spring 14 Colored sharp core 15 Extra lead case 16 Case body 16a Groove 16b Flange 16c Shaft 16d Locking part 17 Cap 18 Eraser 19 Holder 20 Built-in core

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】 軸筒の先端にスプリングで後方に引き込
まれるように設けられたチャックと、そのチャックの後
端に設けられた軸継ぎ手に替え芯ケースのケース本体前
方部が着脱可能に結合されてなるノック式のシャープペ
ンシルに於いて、上記軸継ぎ手後方の筒部の側面に、所
要箇所で筒部の内方に向かって突部を有した弾性片が設
けられ、その筒部の外周に筒体が遊嵌され、筒体が筒部
に対し自重方向に摺動自在となされ、また上記ケース本
体前方部の周面に溝部が設けられて、チャック側上向き
の状態で替え芯ケースが軸筒の後端から軸継ぎ手の筒部
内に挿入され、上記弾性片が外方に変形されると共に突
部がケース本体の溝部に嵌入して軸継ぎ手に対し替え芯
ケースが着脱容易に係止され、その状態でチャック側下
向きとした時に、弾性片及び突部が位置する外周部に上
記筒体が自重で摺動して、弾性片の変形が阻止されるこ
とで軸継ぎ手に対し替え芯ケースが強固に固定可能とな
るように設けられたことを特徴とするシャープペンシ
ル。1. A chuck provided so as to be pulled rearward by a spring at the tip of a barrel, and a case body front portion of a refill case is detachably connected to a shaft joint provided at a rear end of the chuck. In the knock-type mechanical pencil, an elastic piece having a protrusion toward the inside of the cylindrical portion is provided at a required location on a side surface of the cylindrical portion behind the shaft joint, and is provided on an outer periphery of the cylindrical portion. The cylindrical body is loosely fitted, the cylindrical body is slidable in the direction of its own weight with respect to the cylindrical portion, and a groove is provided on the peripheral surface of the front portion of the case main body. The resilient piece is inserted from the rear end of the barrel into the barrel of the shaft coupling, the elastic piece is deformed outward, and the protrusion fits into the groove of the case body, and the replacement lead case is easily locked to and removed from the shaft coupling. When the chuck is turned downward in that state, The cylindrical body is slid by its own weight on the outer peripheral portion where the sex piece and the protrusion are located, and is provided so that the deformation of the elastic piece is prevented so that the replacement lead case can be firmly fixed to the shaft joint. A mechanical pencil characterized by: 【請求項２】 替え芯ケース内に、多孔質の焼成芯体に
染料あるいは顔料インクを含浸させて消しゴムで筆記描
線が容易に消去可能となる着色シャープ芯が内蔵される
と共に、替え芯ケースを着色シャープ芯で筆記した色調
と同系の着色あるいは着色透明として設け、軸筒の外部
から替え芯ケースの全体あるいは一部が視認可能となる
ように設けられたことを特徴とする請求項１に記載のシ
ャープペンシル。2. A refill lead case, in which a porous burned core body is impregnated with a dye or pigment ink and a colored sharp lead that makes it easy to erase a writing line with an eraser, is incorporated. 2. The refill core case is provided so as to be colored or colored and transparent similar to the color tone written with a colored sharp core so that the whole or a part of the refill core case can be visually recognized from the outside of the barrel. Mechanical pencil.