JP3754327B2 - Mechanical pencil knock cover - Google Patents
Mechanical pencil knock cover Download PDFInfo
- Publication number
- JP3754327B2 JP3754327B2 JP2001176634A JP2001176634A JP3754327B2 JP 3754327 B2 JP3754327 B2 JP 3754327B2 JP 2001176634 A JP2001176634 A JP 2001176634A JP 2001176634 A JP2001176634 A JP 2001176634A JP 3754327 B2 JP3754327 B2 JP 3754327B2
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- JP
- Japan
- Prior art keywords
- top end
- end surface
- knock cover
- pipe
- resin injection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
Description
【０００１】
【産業上の利用分野】
本発明はシャープペンシルのノックカバーに関する。
【０００２】
【従来の技術】
一般的なシャープペンシルのノックカバーは、筆記芯を繰り出すためにその頂端面を指で押圧するようになっているが、同時に、替芯を収容する芯パイプの開口端を塞ぐ蓋の役割も有しているので、芯パイプに対し脱着自在となっている。そのため、従来のノックカバーは、芯パイプから外したときに、誤って飲み込むことがあり、喉に詰まらせて窒息する危険があった。この危険を解消するためには、ノックカバーの頂端面に通気孔を設けるという手段が考えられるが、芯パイプ内の替芯がその通気孔を通って抜け落ちるという問題が生じる。
【０００３】
また、樹脂を材料として射出成形されたノックカバーの場合、その表面に金型の樹脂注入ゲート跡が残って見映えが悪いという不満がある。
【０００４】
【発明が解決しようとする課題】
そこで本発明は、芯パイプから外したときに誤って飲み込んでも窒息を防止することができるとともに、芯パイプに嵌着した状態で芯パイプ内の替芯の抜け落ちを防止でき、さらに、樹脂を材料として射出成形した場合に、その金型の樹脂注入ゲート跡が目立たなくて外観の見映えが良いノックカバーの提供を課題とする。
【０００５】
【課題を解決するための手段】
上記課題を解決するために、請求項１記載の本発明のシャープペンシルのノックカバーは、替芯収容部の開口端に脱着自在に設けられた樹脂射出成形よりなるノックカバーにおいて、その頂端面の一部に肉厚以上の深さの陥没面を設けて、その陥没面と頂端面との段差部分に横孔を開設して窒息を防止し、芯パイプ内の替芯の抜け落ちの防止を図ると共に、その陥没面に金型の樹脂注入ゲート部を設定して射出成形され、上記陥没面は、上記頂端面の中央部を横断するように一直線状に設けられていることを特徴とする。
請求項２記載の発明は、替芯収容部の開口端に脱着自在に設けられた樹脂射出成形よりなるノックカバーにおいて、その頂端面の一部に肉厚以上の深さの陥没面を設けて、その陥没面と頂端面との段差部分に横孔を開設して窒息を防止し、芯パイプ内の替芯の抜け落ちの防止を図ると共に、その陥没面に金型の樹脂注入ゲート部を設定して射出成形され、上記陥没面は、上記頂端面に互いに直交して平面十字形を呈するように設けられていることを特徴とする。
請求項３記載の発明は、替芯収容部の開口端に脱着自在に設けられた樹脂射出成形よりなるノックカバーにおいて、その頂端面の一部に肉厚以上の深さの陥没面を設けて、その陥没面と頂端面との段差部分に横孔を開設して窒息を防止し、芯パイプ内の替芯の抜け落ちの防止を図ると共に、その陥没面に金型の樹脂注入ゲート部を設定して射出成形され、上記陥没面は、上記頂端面に平面Ｙ字型に設けられていることを特徴とする。
【０００６】
【作用】
本発明のノックカバーは、芯パイプから外したときに、一端の開口から内部に入った空気が、他端の頂端面と陥没面との段差部分に開設した横孔を通って外部に出るので、両端間の空気の流通が確保されることになり、誤って飲み込んで喉に詰まっても窒息することがない。
【０００７】
また、本発明のノックカバーを芯パイプに嵌着した状態で、シャープペンシルを上下反転させると、替芯はノックカバーの頂端面又は陥没面により受け止められることになり、また、ノックカバーに設けた横孔は落下方向に対して垂直な水平方向に開口しているので、替芯が横孔を通って抜け落ちる虞が少ない。
【０００８】
また、頂端面の陥没面に金型の樹脂注入ゲート部を設定して射出成形したので、そのゲート跡が残っても目立たず、外観の見映えが良い。
【０００９】
【発明の実施の形態】
以下、図を用いて本発明の実施の形態について説明する。まず、図１乃至図３は第１の実施形態を示したものである。図１及び図２に示すように、ノックカバー１の頂端面２の中央部を横断するように一直線状に陥没面３を設けていて、頂端面２は２分割されている。陥没面３の深さ、すなわち、頂端面２から陥没面３までの距離は頂端面２の肉厚より少し大きく、頂端面２と陥没面３の段差部分に横孔４が開設されている。そして、このノックカバー１は樹脂成形品であり、その頂端面２の陥没面３に金型の樹脂注入ゲート部１６を設定して射出成形されたものである。
【００１０】
図３はノックカバー１を芯パイプ５の開口端に嵌着して、シャープペンシルを上下反転した状態を示したものである。芯パイプ５の内部に収容された替芯６は頂端面２又は陥没面３の内面部によって受け止められ、横孔４から抜け落ちる心配はない。なお、図３において符号７は外軸である。
【００１１】
また、図４は第２の実施形態を示したものである。この第２の実施形態に係るノックカバー８は、頂端面９に互いに直交して平面十字形を呈する陥没面１０を設けることによって、頂端面９を４分割して、頂端面９と陥没面１０の段差部分に横孔１１を開設したものである。そして、このノックカバー８も樹脂成形品であり、その頂端面９の陥没面１０に金型の樹脂注入ゲート部１７を設定して射出成形されたものである。
【００１２】
さらに、図５は第３の実施形態を示したものである。この第３の実施形態に係るノックカバー１２は、頂端面１３に平面Ｙ字形の陥没面１４を設けることにより、頂端面１３を３分割して、頂端面１３と陥没面１４の段差部分に横孔１５を開設したものである。そして、このノックカバー１２も樹脂成形品であり、その頂端面１３の陥没面１４に金型の樹脂注入ゲート部１８を設定して射出成形されたものである。
【００１３】
上記のように、ノックカバーの頂端面に設ける陥没面の形状は任意である。頂端面に占める陥没面の割合を大きくすると、横孔の開口面積も大きくなって、ノックカバーの両端間の空気流通性が良好になる。しかし、頂端面は指で押圧して筆記芯を繰り出す部位でもあり、陥没面の割合を大きくし過ぎるとノック操作がしにくくなる。
【００１４】
【発明の効果】
本発明のノックカバーは上記の構成を有することにより、芯パイプから外した状態で誤って飲み込んだ場合の窒息を防止できる効果があり、又、芯パイプに嵌着した状態において芯パイプからの替芯の抜け落ちを防止できると共に、頂端面における陥没面の割合を小さくすることができ、上記頂端面を指で押圧することが容易でノック操作がし易い筆記芯繰り出し部位を形成することができる。また、本発明のノックカバーは上記のように構造が簡単なので、比較的外径が大きなものでも、容易に且つ安価に製造できる利点がある。また、本発明のノックカバーは、樹脂を材料として金型により射出成形する場合に、注入ゲート部を陥没部分に設けるので、金型作成上、又は成形品の外観上も都合が良いという利点がある。すなわち、金型の樹脂注入ゲート跡が残っても目立たないので外観の見映えが良い。
【図面の簡単な説明】
【図１】第１の実施形態に係るノックカバーの斜視図である。
【図２】図１のＡ−Ａ線断面図である。
【図３】第１の実施形態に係るノックカバーを芯パイプに嵌着したシャープペンシルを上下反転した状態の一部断面図である。
【図４】第２の実施形態に係るノックカバーの斜視図である。
【図５】第３の実施形態に係るノックカバーの斜視図である。
【符号の説明】
１ ノックカバー
２ 頂端面
３ 陥没面
４ 横孔
５ 芯パイプ
６ 替芯
７ 外軸
８ ノックカバー
９ 頂端面
１０ 陥没面
１１ 横孔
１２ ノックカバー
１３ 頂端面
１４ 陥没面
１５ 横孔
１６ 樹脂注入ゲート部
１７ 樹脂注入ゲート部
１８ 樹脂注入ゲート部[0001]
[Industrial application fields]
The present invention relates to a mechanical pencil knock cover.
[0002]
[Prior art]
A general mechanical pencil knock cover is designed so that the top end surface is pressed with a finger in order to feed out the writing core. At the same time, it also serves as a lid that closes the open end of the core pipe that accommodates the replacement core. Therefore, it is detachable from the core pipe. For this reason, when the conventional knock cover is removed from the core pipe, it may be swallowed by mistake, and there is a risk of suffocating by clogging the throat. In order to eliminate this danger, a means of providing a vent hole in the top end surface of the knock cover can be considered, but there arises a problem that the replacement core in the core pipe falls out through the vent hole.
[0003]
Further, in the case of a knock cover that is injection-molded using a resin as a material, there is a complaint that the resin injection gate trace of the mold remains on the surface and the appearance is poor.
[0004]
[Problems to be solved by the invention]
Therefore, the present invention can prevent suffocation even if it is accidentally swallowed when removed from the core pipe, and can prevent the fall of the extra core in the core pipe while it is fitted to the core pipe. When the injection molding is performed, it is an object to provide a knock cover that has a good appearance because the resin injection gate trace of the mold is not conspicuous.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the knock cover of the mechanical pencil according to the first aspect of the present invention is a knock cover made of resin injection molding that is detachably provided at the opening end of the replacement core housing portion. A recessed surface with a depth greater than the wall thickness is provided in part, and a horizontal hole is formed in the step between the recessed surface and the top end surface to prevent suffocation and to prevent the replacement core from falling off in the core pipe. At the same time, a resin injection gate portion of a mold is set on the depressed surface, and injection molding is performed. The depressed surface is provided in a straight line so as to cross the central portion of the top end surface.
The invention according to
According to a third aspect of the present invention, in the knock cover made of resin injection molding that is detachably provided at the opening end of the replacement core accommodating portion, a recessed surface having a depth greater than the thickness is provided on a part of the top end surface. In addition, a lateral hole is opened in the step between the recessed surface and the top end surface to prevent suffocation and prevent replacement core from falling off in the core pipe, and a mold resin injection gate is set on the recessed surface. The recessed surface is provided in a plane Y shape on the top end surface.
[0006]
[Action]
When the knock cover of the present invention is removed from the core pipe, the air that has entered from the opening at one end exits to the outside through a lateral hole formed in the stepped portion between the top end surface and the recessed surface at the other end. The air flow between the two ends will be ensured, and even if it is swallowed and clogged in the throat, it will not suffocate.
[0007]
Further, when the mechanical pencil is turned upside down with the knock cover of the present invention fitted to the core pipe, the replacement core is received by the top end surface or the recessed surface of the knock cover, and is provided on the knock cover. Since the horizontal hole opens in the horizontal direction perpendicular to the falling direction, there is little possibility that the replacement core will fall out through the horizontal hole.
[0008]
In addition, since the resin injection gate portion of the mold is set on the recessed surface of the top end surface and injection molding is performed, even if the gate trace remains, it does not stand out and the appearance is good.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, FIGS. 1 to 3 show a first embodiment. As shown in FIGS. 1 and 2, a
[0010]
FIG. 3 shows a state where the
[0011]
FIG. 4 shows the second embodiment. In the
[0012]
Further, FIG. 5 shows a third embodiment. In the
[0013]
As described above, the shape of the depressed surface provided on the top end surface of the knock cover is arbitrary. When the ratio of the depressed surface occupying the top end surface is increased, the opening area of the lateral hole is also increased, and the air flow between the both ends of the knock cover is improved. However, the top end surface is also a part that is pushed out with a finger and feeds out the writing core. If the ratio of the depressed surface is too large, the knocking operation becomes difficult.
[0014]
【The invention's effect】
The knock cover of the present invention has the above-described configuration, and thus has an effect of preventing suffocation when accidentally swallowed in a state where it is removed from the core pipe. The core can be prevented from falling off, the ratio of the recessed surface on the top end surface can be reduced, and a writing core feed-out portion that can be easily pressed with a finger and easily knocked can be formed. In addition, since the knock cover of the present invention has a simple structure as described above, there is an advantage that even a relatively large outer diameter can be manufactured easily and inexpensively. In addition, the knock cover of the present invention has an advantage that it is convenient in terms of mold making or appearance of the molded product because the injection gate portion is provided in the recessed portion when injection molding is performed using resin as a material. is there. That is, the appearance of the resin is good because it is not noticeable even if the resin injection gate trace of the mold remains.
[Brief description of the drawings]
FIG. 1 is a perspective view of a knock cover according to a first embodiment.
FIG. 2 is a cross-sectional view taken along line AA in FIG.
FIG. 3 is a partial cross-sectional view of a mechanical pencil with the knock cover according to the first embodiment fitted to a core pipe and turned upside down.
FIG. 4 is a perspective view of a knock cover according to a second embodiment.
FIG. 5 is a perspective view of a knock cover according to a third embodiment.
[Explanation of symbols]
DESCRIPTION OF
Claims (3)
上記陥没面は、上記頂端面の中央部を横断するように一直線状に設けられていることを特徴とするシャープペンシルのノックカバー。In a knock cover made of resin injection molding that is detachably provided at the opening end of the replacement core accommodating portion, a recessed surface having a depth greater than a thickness is provided on a part of the top end surface, and the recessed surface and the top end surface A side hole is opened in the step part of the pipe to prevent suffocation, and the replacement pipe in the core pipe is prevented from falling off, and a resin injection gate part of the mold is set on the depressed surface, and injection molding is performed.
The knock cover of a mechanical pencil, wherein the depressed surface is provided in a straight line so as to cross a central portion of the top end surface.
上記陥没面は、上記頂端面に互いに直交して平面十字形を呈するように設けられていることを特徴とするシャープペンシルのノックカバー。In a knock cover made of resin injection molding that is detachably provided at the opening end of the replacement core accommodating portion, a recessed surface having a depth greater than a thickness is provided on a part of the top end surface, and the recessed surface and the top end surface A side hole is opened in the step part of the pipe to prevent suffocation, and the replacement pipe in the core pipe is prevented from falling off, and a resin injection gate part of the mold is set on the depressed surface, and injection molding is performed.
The knock cover of a mechanical pencil, wherein the recessed surface is provided so as to form a planar cross shape perpendicular to each other on the top end surface.
上記陥没面は、上記頂端面に平面Ｙ字型に設けられていることを特徴とするシャープペンシルのノックカバー。In a knock cover made of resin injection molding that is detachably provided at the opening end of the replacement core accommodating portion, a recessed surface having a depth greater than a thickness is provided on a part of the top end surface, and the recessed surface and the top end surface A side hole is opened in the step part of the pipe to prevent suffocation, and the replacement pipe in the core pipe is prevented from falling off, and a resin injection gate part of the mold is set on the depressed surface, and injection molding is performed.
The knock cover of a mechanical pencil, wherein the depressed surface is provided in a plane Y shape on the top end surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001176634A JP3754327B2 (en) | 2001-06-12 | 2001-06-12 | Mechanical pencil knock cover |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001176634A JP3754327B2 (en) | 2001-06-12 | 2001-06-12 | Mechanical pencil knock cover |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20834595A Division JPH0939474A (en) | 1995-07-24 | 1995-07-24 | Mechanical pencil knock cover |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002019377A JP2002019377A (en) | 2002-01-23 |
| JP3754327B2 true JP3754327B2 (en) | 2006-03-08 |
Family
ID=19017598
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001176634A Expired - Fee Related JP3754327B2 (en) | 2001-06-12 | 2001-06-12 | Mechanical pencil knock cover |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3754327B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4515824B2 (en) * | 2004-05-27 | 2010-08-04 | Ｎｔｎ株式会社 | High precision plain bearing |
| JP5834485B2 (en) * | 2011-05-13 | 2015-12-24 | 株式会社リコー | Exterior cover and image forming apparatus |
| JP6310210B2 (en) * | 2013-08-20 | 2018-04-11 | 三菱鉛筆株式会社 | Writing instrument |
| JP7677775B2 (en) * | 2020-11-02 | 2025-05-15 | 三菱鉛筆株式会社 | Cover member and writing implement equipped with cover member |
-
2001
- 2001-06-12 JP JP2001176634A patent/JP3754327B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2002019377A (en) | 2002-01-23 |
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