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JP3929275B2 - Writing instrument shaft - Google Patents

Writing instrument shaft Download PDF

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Publication number
JP3929275B2
JP3929275B2 JP2001315310A JP2001315310A JP3929275B2 JP 3929275 B2 JP3929275 B2 JP 3929275B2 JP 2001315310 A JP2001315310 A JP 2001315310A JP 2001315310 A JP2001315310 A JP 2001315310A JP 3929275 B2 JP3929275 B2 JP 3929275B2
Authority
JP
Japan
Prior art keywords
inclination
shaft cylinder
inclined surface
window hole
shaft
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
Application number
JP2001315310A
Other languages
Japanese (ja)
Other versions
JP2003118286A (en
Inventor
睦夫 村瀬
琢磨 飯田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pilot Corp KK
Original Assignee
Pilot Corp KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Pilot Corp KK filed Critical Pilot Corp KK
Priority to JP2001315310A priority Critical patent/JP3929275B2/en
Publication of JP2003118286A publication Critical patent/JP2003118286A/en
Application granted granted Critical
Publication of JP3929275B2 publication Critical patent/JP3929275B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Pens And Brushes (AREA)
  • 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、射出成形にて透明な樹脂で成形する軸筒本体の把持部に天面を平地状とした凸部を形成すると共に、把持部を被覆する把持部材に凸部と対応した窓孔部を形成し、把持部材を把持部に窓孔部を把持部の凸部に嵌着させて装着してなる筆記具の軸筒に関する。
【0002】
【従来の技術】
従来より、筆記具を握りやすくするために、軸筒本体の把持部にシリコンゴムやエラストマー等の弾性樹脂からなる把持部材を被覆した軸筒は良く知られている。また、デザインの向上や把持部材の回転防止のために、把持部材の窓孔部を軸筒本体に形成した天面が平地状の凸部に嵌着して装着した軸筒も知られている。尚、この様な軸筒においては、窓孔部からボールペンのインキ残量や、シャープペンシルの芯残量を確認できるように軸筒本体を透明な樹脂で形成したものが多く用いられている。
【0003】
ところで、軸筒本体に形成する凸部は、射出成形時における金型からの抜けを良くするために、通常、凸部の側面を底面に向かうにしたがって拡開する傾斜面としている。さらに、従来の軸筒を図を用いて説明をおこなうと、図3は、従来の軸筒の断面の一部を示す図で、把持部材101の窓孔部102を軸筒本体201の把持部202に形成した凸部203に嵌着して装着した部分の断面である。図3に示す凸部203は天面204を平地状とし、側面205を底面206に向かうにしたがって拡開する傾斜面205aとし、軸筒本体201の外表面207に対する傾斜面205aの傾斜Sを急な勾配で形成してある。
【0004】
また、図4は、他の従来の軸筒の断面の一部を示す図で、把持部材301の窓孔部302を軸筒本体401の把持部材402に形成した凸部403に嵌着して装着した部分の断面である。図4に示す凸部403は天面404を平地状とし、側面405を底面406に向かうにしたがって拡開する傾斜面405aとし、軸筒本体401の外表面407に対する傾斜面405aの傾斜Tを緩やかな勾配で形成してある。
【0005】
【発明が解決しようとする課題】
したがって、図3に示す凸部203は、傾斜Sが急な勾配となっているため、天面204の端部角S1がきつくなり、軸筒本体201の射出成形において端部角S1の内面部分で湯の流れUに乱れが生じ易くなり、その結果として、天面204側の内面部分に気泡Kが溜まり、軸筒本体201が透明樹脂である場合には窓孔部102から気泡Kが見えて見栄えが悪くなるという問題があった。
【0006】
また、図4に示す凸部403は、傾斜Tが緩やかな勾配となっているため、天面404の端部角T1も滑らかになり、湯の流れVに乱れは生じず、天面404の端部角T1の内面部分に気泡が溜まることはないが、把持部材301における窓孔部302の外縁部303が広範囲に渡り薄肉となり、その結果として、外縁部303が透けて見えてしまうという問題があった。
【0007】
本発明はこうした問題点を解消するために、軸筒本体に形成する凸部の内面部分に気泡が溜まることがなく、また、把持部材の窓孔部における外縁部が透けて見えることがない筆記具の軸筒を提供することを目的とする。
【0008】
【課題を解決するための手段】
次に、前記課題の解決するために案出した本発明の筆記具の軸筒を説明する。
「1.射出成形にて透明な樹脂で成形する軸筒本体の把持部に天面を平地状とした凸部を形成し、該把持部を被覆する把持部材に前記凸部と対応した窓孔部を形成し、把持部材を把持部に窓孔部を把持部の凸部に嵌着させて装着してなる筆記具の軸筒において、前記凸部の側面を天面から底面に向かうにしたがって拡開する天面側の第1傾斜面と、底面側の第2傾斜面とで構成し、且つ軸筒本体の外表面に対する第1傾斜面の傾斜P、第2傾斜面の傾斜Qとしたとき、傾斜P>傾斜Qとなるようにしたことを特徴とする。」
【0009】
本発明における傾斜P及び傾斜Qの具体的な角度は、軸筒本体及び把持部材に使用する材料により適宜設定すれば良く、本発明の要旨は、凸部の側面の傾斜を段階的に分けることにあり、特に底面側の第2傾斜面の傾斜Qを天面側の第1傾斜面の傾斜Pより緩やかにすることにより、射出成形時において軸筒本体の凸部の部分に入り込む滑らかな湯の流れを確保して気泡が溜まることを防ぎ、また、第1傾斜面の傾斜Pを第2傾斜面の傾斜Qより急にすることにより、把持部材の窓孔部における外縁部に適度な厚みを与えて外縁部が透けて見えることを防ぐためである。
【0010】
【発明の実施の形態】
次に、本発明を理解し易くするために図を用いて説明を行なう。尚、本実施の形態では、筆記具の軸筒としてボールペンの軸筒を用いて説明を行なうが、本発明はボールペンの軸筒に限定されるものではなく、シャープペンシルやサインペン等の種種の筆記具の軸筒に用いることができる。また、本発明では、ボールペンのチップ側を前方として表現し、その反対側を後方として表現する。
【0011】
図1は、本実施の形態の軸筒を使用したボールペンの側面図である。図1においてボールペンの軸筒1は、透明な樹脂からなる軸筒本体2の把持部3に、弾性樹脂からなる把持部材4を被覆し、軸筒本体2の前方に先窄み部5を形成している。また、先窄み部5の先端開口(図示せず)からは軸筒本体2の内部に収容したレフィル6のチップ部6aを突出しており、軸筒本体2の後方に配設したノック部7のノック体7aを押圧操作することにより、チップ部6aを出没可能としている。尚、ノック部7の側面にはクリップ7bを形成している。
【0012】
また、軸筒本体2の把持部3には、天面8aが平地状の凸部8を形成しており、把持部材4には凸部8に対応した窓孔部4aを形成し、把持部材4を把持部3に窓孔部4aを把持部3の凸部8に嵌着して装着している。
【0013】
図2は、図1のA−A線の要部断面図である。図2において、凸部8は天面8aから底面8bに向かうにしたがって拡開する側面9を有しており、側面9は、天面側の第1傾斜面9aと底面側の第2傾斜面9bとで構成している。また、軸筒本体2の外表面2aに対する第1傾斜面9aの傾斜Pと第2傾斜面9bの傾斜Qとの関係は、傾斜P>傾斜Qとなっており、傾斜Qが傾斜Pより緩やかになっていることから、射出成形時において軸筒本体2の凸部8の部分に入り込む滑らかな湯の流れWを確保しつつ、傾斜Pが傾斜Qより急になっていることから、把持部材4における窓孔部4aの外縁部4bに適度な厚みを持たせている。尚、本実施の形態では傾斜Pを45°とし、傾斜Qを38°としている。
【0014】
【発明の効果】
本発明は以上のような構成のため、射出成形時において軸筒本体の凸部の部分に入り込む滑らかな湯の流れを確保して気泡が溜まることを防ぎ、また、把持部材における窓孔部の外縁部に適度な厚みを与えて、外縁部が透けて見えることを防げるものとなった。
【図面の簡単な説明】
【図1】 本実施の形態の軸筒を使用したボールペンの側面図である。
【図2】 図1のA−A線の要部断面図である。
【図3】 従来の軸筒の断面の一部を示す図である。
【図4】 他の従来の軸筒の断面の一部を示す図である。
【符号の説明】
1…ボールペンの軸筒、2…軸筒本体、3…把持部、
4…把持部材、4a…窓孔部、4b…外縁部、
5…先窄み部、
6…レフィル、6a…チップ部、7…ノック部、7a…ノック体、
8…凸部、8a…天面、8b…底面、
9…側面、9a…第1傾斜面、9b…第2傾斜面。
[0001]
[Industrial application fields]
The present invention forms a convex portion with a flat top surface on the grip portion of the shaft cylinder body that is molded from a transparent resin by injection molding , and has a window hole corresponding to the convex portion on the grip member that covers the grip portion. It is related with the axial cylinder of the writing instrument which forms a part and mounts | wears with a holding member fitted to a holding part by making a window hole fit into the convex part of a holding part.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a shaft tube in which a gripping member made of an elastic resin such as silicon rubber or elastomer is coated on a grip portion of a shaft tube main body to make it easy to grip a writing instrument is well known. Also known is a shaft cylinder in which the top surface, in which the window hole portion of the gripping member is formed in the main body of the shaft cylinder, is fitted to the flat convex portion to improve the design and prevent rotation of the gripping member. . In such a shaft tube, a shaft tube body formed of a transparent resin is often used so that the ink remaining amount of the ballpoint pen and the core remaining amount of the mechanical pencil can be confirmed from the window hole.
[0003]
By the way, the convex part formed in the shaft cylinder main body is usually an inclined surface that expands toward the bottom surface of the convex part in order to improve the escape from the mold during injection molding. Further, the conventional shaft cylinder will be described with reference to the drawings. FIG. 3 is a view showing a part of a cross section of the conventional shaft cylinder, and the window hole portion 102 of the gripping member 101 is replaced with the gripping portion of the shaft tube main body 201. 6 is a cross section of a portion fitted and mounted on a convex portion 203 formed on 202. The convex portion 203 shown in FIG. 3 has a top surface 204 as a flat ground shape, and a side surface 205 as an inclined surface 205 a that expands toward the bottom surface 206, and the inclination S of the inclined surface 205 a with respect to the outer surface 207 of the barrel body 201 is steep. It is formed with a simple gradient.
[0004]
FIG. 4 is a view showing a part of a cross section of another conventional shaft cylinder. The window hole portion 302 of the gripping member 301 is fitted to the convex portion 403 formed on the gripping member 402 of the shaft tube main body 401. It is a cross section of the attached part. The convex portion 403 shown in FIG. 4 has a top surface 404 that is flat, and a side surface 405 that is an inclined surface 405a that expands toward the bottom surface 406, and the inclination T of the inclined surface 405a with respect to the outer surface 407 of the barrel body 401 is moderate. It is formed with a simple gradient.
[0005]
[Problems to be solved by the invention]
Therefore, the convex portion 203 shown in FIG. 3 has a steep slope S, so that the end portion angle S1 of the top surface 204 is tight, and the inner surface portion of the end portion angle S1 in the injection molding of the shaft main body 201. As a result, bubbles K accumulate on the inner surface portion on the top surface 204 side, and when the barrel body 201 is made of transparent resin, the bubbles K can be seen from the window hole portion 102. There was a problem that it looked bad.
[0006]
In addition, since the convex portion 403 shown in FIG. 4 has a gentle slope T, the end angle T1 of the top surface 404 is also smooth, and the hot water flow V is not disturbed. Although bubbles do not collect on the inner surface portion of the end corner T1, the outer edge portion 303 of the window hole portion 302 in the gripping member 301 becomes thin over a wide range, and as a result, the outer edge portion 303 can be seen through. was there.
[0007]
In order to solve such problems, the present invention does not collect bubbles on the inner surface portion of the convex portion formed on the shaft cylinder body, and does not allow the outer edge portion of the window hole portion of the gripping member to be seen through. An object of the present invention is to provide a shaft cylinder.
[0008]
[Means for Solving the Problems]
Next, the shaft cylinder of the writing instrument of the present invention devised to solve the above problems will be described.
“1. A convex part having a top surface formed in a flat shape is formed in a gripping part of a shaft cylinder body molded by a transparent resin by injection molding, and a window hole corresponding to the convex part is formed in a gripping member that covers the gripping part Forming a gripping member and attaching a window member to a convex portion of the gripping portion and attaching the gripping member to the gripping portion, the side surface of the convex portion is expanded from the top surface toward the bottom surface. When it is composed of a first inclined surface on the top surface side to be opened and a second inclined surface on the bottom surface side, and the inclination P of the first inclined surface and the inclination Q of the second inclined surface with respect to the outer surface of the shaft cylinder body , The inclination P> the inclination Q.
[0009]
The specific angles of the inclination P and the inclination Q in the present invention may be set as appropriate depending on the materials used for the shaft cylinder main body and the gripping member. In particular, by making the inclination Q of the second inclined surface on the bottom surface side gentler than the inclination P of the first inclined surface on the top surface side, smooth hot water that enters the convex portion of the shaft cylinder body at the time of injection molding To prevent bubbles from accumulating, and by making the inclination P of the first inclined surface steeper than the inclination Q of the second inclined surface, an appropriate thickness is provided at the outer edge portion of the window hole portion of the gripping member. This is to prevent the outer edge portion from being seen through.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Next, in order to facilitate understanding of the present invention, description will be made with reference to the drawings. In this embodiment, a ballpoint pen barrel is used as the writing instrument shaft. However, the present invention is not limited to the ballpoint pen shaft, and various writing tools such as a mechanical pencil and a sign pen are used. It can be used for a shaft tube. Further, in the present invention, the tip side of the ballpoint pen is expressed as the front, and the opposite side is expressed as the rear.
[0011]
FIG. 1 is a side view of a ballpoint pen using the shaft tube of the present embodiment. 1, a shaft cylinder 1 of a ballpoint pen covers a gripping member 4 made of an elastic resin on a gripping part 3 of a shaft cylinder body 2 made of a transparent resin, and forms a tapered portion 5 in front of the shaft cylinder body 2. is doing. Further, a tip portion 6 a of a refill 6 accommodated inside the shaft tube main body 2 protrudes from a tip opening (not shown) of the tapered portion 5, and a knock portion 7 disposed behind the shaft tube body 2. By pressing the knock body 7a, the tip portion 6a can be projected and retracted. A clip 7 b is formed on the side surface of the knock portion 7.
[0012]
Moreover, the top surface 8a forms a flat convex portion 8 in the grip portion 3 of the shaft cylinder body 2, and the window hole portion 4a corresponding to the convex portion 8 is formed in the grip member 4, and the grip member 4 is attached to the grip portion 3 and the window hole portion 4 a is fitted to the convex portion 8 of the grip portion 3.
[0013]
FIG. 2 is a cross-sectional view of a main part taken along line AA in FIG. In FIG. 2, the convex portion 8 has a side surface 9 that expands from the top surface 8a toward the bottom surface 8b. The side surface 9 includes a first inclined surface 9a on the top surface side and a second inclined surface on the bottom surface side. 9b. Further, the relationship between the inclination P of the first inclined surface 9a and the inclination Q of the second inclined surface 9b with respect to the outer surface 2a of the shaft cylinder body 2 is such that inclination P> inclination Q, and the inclination Q is gentler than the inclination P. Since the slope P is steeper than the slope Q while ensuring a smooth hot water flow W that enters the portion of the convex portion 8 of the shaft body 2 during injection molding, the gripping member The outer edge portion 4b of the window hole portion 4a in FIG. In the present embodiment, the inclination P is 45 ° and the inclination Q is 38 °.
[0014]
【The invention's effect】
Since the present invention is configured as described above, it ensures a smooth flow of hot water that enters the convex portion of the shaft cylinder body during injection molding to prevent air bubbles from accumulating. Appropriate thickness was given to the outer edge portion to prevent the outer edge portion from being seen through.
[Brief description of the drawings]
FIG. 1 is a side view of a ballpoint pen using a shaft tube of an embodiment.
FIG. 2 is a cross-sectional view of a main part taken along line AA in FIG.
FIG. 3 is a view showing a part of a cross section of a conventional shaft cylinder.
FIG. 4 is a view showing a part of a cross section of another conventional shaft cylinder.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Ball-point pen axial cylinder, 2 ... Shaft cylinder main body, 3 ... Grasping part,
4 ... gripping member, 4a ... window hole, 4b ... outer edge,
5 ... Constriction,
6 ... Refill, 6a ... Chip part, 7 ... Knock part, 7a ... Knock body,
8 ... convex portion, 8a ... top surface, 8b ... bottom surface,
9 ... side surface, 9a ... first inclined surface, 9b ... second inclined surface.

Claims (1)

射出成形にて透明な樹脂で成形する軸筒本体の把持部に天面を平地状とした凸部を形成し、該把持部を被覆する把持部材に前記凸部と対応した窓孔部を形成し、把持部材を把持部に窓孔部を把持部の凸部に嵌着させて装着してなる筆記具の軸筒において、前記凸部の側面を天面から底面に向かうにしたがって拡開する天面側の第1傾斜面と、底面側の第2傾斜面とで構成し、且つ軸筒本体の外表面に対する第1傾斜面の傾斜P、第2傾斜面の傾斜Qとしたとき、傾斜P>傾斜Qとなるようにしたことを特徴とする筆記具の軸筒。A convex part with a top surface is formed on the grip part of the shaft cylinder body that is molded from a transparent resin by injection molding, and a window hole part corresponding to the convex part is formed on the grip member that covers the grip part. In the writing tube shaft in which the gripping member is attached to the gripping portion and the window hole portion is fitted to the convex portion of the gripping portion, the side surface of the convex portion is expanded from the top surface to the bottom surface. When the first inclined surface on the surface side and the second inclined surface on the bottom surface side are formed, and the inclination P of the first inclined surface with respect to the outer surface of the shaft cylinder body and the inclination Q of the second inclined surface, the inclination P > Shaft cylinder of writing instrument, characterized in that it has an inclination Q.
JP2001315310A 2001-10-12 2001-10-12 Writing instrument shaft Expired - Fee Related JP3929275B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
JP2001315310A JP3929275B2 (en) 2001-10-12 2001-10-12 Writing instrument shaft

Publications (2)

Publication Number Publication Date
JP2003118286A JP2003118286A (en) 2003-04-23
JP3929275B2 true JP3929275B2 (en) 2007-06-13

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005144772A (en) * 2003-11-13 2005-06-09 Mitsubishi Pencil Co Ltd Barrel for writing utensil and ball-point pen

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