JPH088156Y2 - Mechanical pencil chuck ring - Google Patents
Mechanical pencil chuck ringInfo
- Publication number
- JPH088156Y2 JPH088156Y2 JP1987178445U JP17844587U JPH088156Y2 JP H088156 Y2 JPH088156 Y2 JP H088156Y2 JP 1987178445 U JP1987178445 U JP 1987178445U JP 17844587 U JP17844587 U JP 17844587U JP H088156 Y2 JPH088156 Y2 JP H088156Y2
- Authority
- JP
- Japan
- Prior art keywords
- chuck
- inner diameter
- chuck ring
- core gripping
- gripping portion
- 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 - Lifetime
Links
Landscapes
- Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
Description
【考案の詳細な説明】 （産業上の利用分野） 本考案は、シャープペンシルのチャックリング、特
に、塑性加工により形成される真鍮等金属製のチャック
リングに関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a mechanical chuck ring for mechanical pencils, and more particularly to a metallic chuck ring made of plastic such as brass.
（従来の技術） 従来、例えば第２図に示すように、前端部に外面がテ
ーパ状の芯把持部２を有すると共にその後方に突起４を
設けたシャープペンシルのチャック１に対して、後端口
径をチャック１の芯把持部２の前端の最大外径より小さ
くし、且つ突起４の外径より僅かに小さくして、後方か
ら突起４を弾性変形により乗り越えてから芯把持部２の
外周部に装着されて、その芯把持部２を締め付けるよう
にしたチャックリング３が存在する。そして、このよう
な従来の殆どのチャックリング３は、その内径が前端か
ら後端まで徐々に縮小するように内面全体がテーパ状に
形成されている。(Prior Art) Conventionally, for example, as shown in FIG. 2, a rear end of a mechanical pencil chuck 1 having a lead gripping portion 2 having an outer surface with a tapered outer surface and a protrusion 4 provided at the rear end thereof is used. The diameter is made smaller than the maximum outer diameter of the front end of the core gripping portion 2 of the chuck 1 and slightly smaller than the outer diameter of the projection 4 so that the projection 4 can be elastically deformed from the rear side and then the outer peripheral portion of the core gripping portion 2 can be obtained. There is a chuck ring 3 which is attached to the core and is adapted to tighten the core gripping portion 2. In most of the conventional chuck rings 3 as described above, the entire inner surface is tapered so that the inner diameter thereof is gradually reduced from the front end to the rear end.
（考案が解決しようとする問題点） 真鍮等の金属製のチャックリングは一般にプレス機等
を用いた塑性加工によって形成されるが、チャックリン
グの内面全体をテーパ状に形成する場合、ダイハイトの
誤差がチャックリングの内径に影響し、特にチャックリ
ング前端部の内径が不均一化して品質が不安定化する問
題があった。本考案は斯かる問題点の解決を図るもの
で、即ち、前端部の内径精度が均一になるように加工で
きて品質を安定化することができ、かつチャックの後方
への抜けを防止できるチャックリングの提供を目的とす
るものである。(Problems to be solved by the invention) A chuck ring made of metal such as brass is generally formed by plastic working using a press or the like. However, when the entire inner surface of the chuck ring is formed into a taper shape, the die height error Influences the inner diameter of the chuck ring, and in particular, the inner diameter of the front end portion of the chuck ring becomes non-uniform, and the quality becomes unstable. The present invention is intended to solve such a problem, that is, it is possible to perform processing so that the inner diameter accuracy of the front end portion is uniform, the quality can be stabilized, and the chuck can be prevented from slipping backward. The purpose is to provide a ring.
（問題点を解決するための手段） 上記目的を達成するために、本考案のシャープペンシ
ルのチャックリングは、チャックの外面テーパ状の芯把
持部の外周部に装着されてチャックに直に接触して芯把
持部の締め付けを行う塑性加工で製作される真鍮等金属
製のチャックリングにおいて、前端部に締付部となる内
径が一定のストレート内面部を所要長さ設けると共にそ
の後方部位に略均肉の厚さを持ち内径が徐々に縮小する
テーパ内面部を連設し該テーパ内面部の後端位置の最小
内径をチャックの芯把持部の後方に設けた抜け止め突起
の外接円径より僅かに小さくしたことを特徴とする構成
としたものである。(Means for Solving the Problems) In order to achieve the above object, the chuck ring of the mechanical pencil of the present invention is mounted on the outer peripheral portion of the outer core tapered gripping portion of the chuck and directly contacts the chuck. In a chuck ring made of metal such as brass manufactured by plastic working that tightens the core grip part, a straight inner surface part with a constant inner diameter that serves as the tightening part is provided at the front end for the required length, and at the rear part of it is approximately uniform. The minimum inner diameter at the rear end position of the taper inner surface portion, which has a thickness of meat and whose inner diameter is gradually reduced, is set to be slightly smaller than the circumscribed circle diameter of the retaining protrusion provided behind the core gripping portion of the chuck. The configuration is characterized by being made smaller.
（作用） 本願考案のチャックリングをプレス機による塑性加工
で製造する場合、チャックリングの内部へパンチが挿入
され、パンチのストレート部による押圧によってチャッ
クリングの前端から所要距離後方位置までストレート内
面部が形成され、パンチのテーパ部による押圧によって
チャックリングのストレート内面部の後方部位にテーパ
内面部が形成されるが、ダイハイトに誤差が生じてチャ
ックリングに対するパンチの軸方向の位置に若干のずれ
が生じていても、パンチのストレート部が前後方向に夫
々ダイハイトの誤差以上の長さを有していれば、チャッ
クリングの前端内面部と接触するパンチの部位はやはり
ストレート部であり、従ってチャックリングの前端部内
径は変化なく一定となる。(Operation) When the chuck ring of the present invention is manufactured by plastic working with a press, the punch is inserted into the chuck ring, and the straight inner surface of the chuck ring is pressed from the front end of the chuck ring to the rear position by the pressing force of the straight part of the punch. The taper inner part of the chuck ring is formed by pressing by the taper part of the punch, but a taper inner surface part is formed at the rear part of the straight inner surface part of the chuck ring. However, if the straight part of the punch has a length in the front-rear direction that is equal to or greater than the error of the die height, the part of the punch that contacts the inner surface of the front end of the chuck ring is still the straight part, and therefore the chuck ring The inner diameter of the front end remains constant without change.
また、テーパ内面部の後端位置の最小内径をチャック
の芯把持部の後方に設けた抜け止め突起の外接円径より
僅かに小さくしたことにより、チャックの後方への抜け
が防止される。Further, the minimum inner diameter at the rear end position of the inner surface of the taper is made slightly smaller than the circumscribed circle diameter of the retaining projection provided on the rear side of the core gripping portion of the chuck, whereby the rearward movement of the chuck is prevented.
（実施例） 第１図は本考案実施例のチャックリング３を示したも
ので、その前端からダイハイトの誤差として考えられる
最大値より長い距離だけ後方位置まで内径が一定なスト
レート内面部５を設けると共に、その後方部位に内径が
徐々に縮小するテーパ内面部６を後端まで設けて、塑性
加工が可能な真鍮等の金属によって形成されたものであ
る。(Embodiment) FIG. 1 shows a chuck ring 3 according to an embodiment of the present invention, in which a straight inner surface portion 5 having a constant inner diameter is provided from a front end thereof to a rear position by a distance longer than a maximum value considered as an error in die height. At the same time, a taper inner surface portion 6 whose inner diameter is gradually reduced is provided up to the rear end at the rear portion thereof, and is formed of metal such as brass that can be plastically worked.
また、テーパ内面部６の後端位置の最小内径をチャッ
クの芯把持部の後方に設けた抜け止め突起の外接円径よ
り僅かに小さく設定している。Further, the minimum inner diameter at the rear end position of the tapered inner surface portion 6 is set to be slightly smaller than the circumscribed circle diameter of the retaining projection provided behind the core gripping portion of the chuck.
（考案の効果） 本願考案のチャックリングは上記のように略均肉の厚
さを持ち内径が徐々に縮小するテーパ内面部の前方位置
に所要長さのストレート内面部を設けたことにより、塑
性加工により形成する場合においてダイハイトに誤差が
生じた場合でもその誤差がストレート内面部によって吸
収されるので前端部の内径が常に均一となって品質が極
めて安定し、よってチャックに対する締め付け性能を安
定化させることができ、又、テーパ内面部を設けた部位
が略均肉の厚さを持つことにより軸方向の相当の長さに
わたって内面及び外面が共に略同一勾配のテーパ状とな
るため、プレス加工を無理なく行うことができると共
に、プレス加工後にプレス金型のパンチやダイとの離型
性が良好となって、安定した製造が可能となり、更に、
テーパ内面部の後端位置の最小内径をチャックの芯把持
部の後方に設けた抜け止め突起の外接円径より僅かに小
さくしたことにより、チャックの後方への抜け止めを防
止できるものである。(Effect of the Invention) The chuck ring of the present invention has a straight inner surface portion of a required length in front of the taper inner surface portion having a substantially uniform thickness and a gradually decreasing inner diameter as described above, so Even if an error occurs in the die height when forming by processing, the error is absorbed by the straight inner surface, so the inner diameter of the front end is always uniform and the quality is extremely stable, thus stabilizing the tightening performance for the chuck. Moreover, since the portion where the tapered inner surface portion is provided has a substantially uniform thickness, both the inner surface and the outer surface are tapered with substantially the same gradient over a considerable length in the axial direction. It can be done without difficulty, and the mold release from the punch and die of the press die becomes good after press working, which enables stable production.
By making the minimum inner diameter at the rear end position of the taper inner surface portion slightly smaller than the circumscribed circle diameter of the retaining projection provided on the rear side of the core gripping portion of the chuck, it is possible to prevent the rearward retaining of the chuck.
第１図は本考案実施例の断面図、第２図は従来例のチャ
ックへ装着した状態の断面図である。 １……チャック、２……芯把持部、３……チャックリン
グ、４……突起、５……ストレート内面部、６……テー
パ内面部。FIG. 1 is a cross-sectional view of an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a conventional chuck mounted on a chuck. 1 ... Chuck, 2 ... Core gripping part, 3 ... Chuck ring, 4 ... Protrusion, 5 ... Straight inner surface part, 6 ... Tapered inner surface part.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭53−40323（ＪＰ，Ａ) 実開 昭58−190182（ＪＰ，Ｕ) 実開 昭59−12687（ＪＰ，Ｕ) 実開 昭62−9588（ＪＰ，Ｕ) 実開 平１−13387（ＪＰ，Ｕ) 特公 昭58−39680（ＪＰ，Ｂ２) ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-53-40323 (JP, A) Actual opening Sho-58-190182 (JP, U) Actual opening Sho-59-12687 (JP, U) Actual opening Sho-62- 9588 (JP, U) Actual Kaihei 1-13387 (JP, U) JP 58-39680 (JP, B2)
Claims (1)
部に装着されてチャックに直に接触して芯把持部の締め
付けを行う塑性加工で製作される真鍮等金属製のチャッ
クリングにおいて、前端部に締付部となる内径が一定の
ストレート内面部を所要長さ設けると共にその後方部位
に略均肉の厚さを持ち内径が徐々に縮小するテーパ内面
部を連設し該テーパ内面部の後端位置の最小内径をチャ
ックの芯把持部の後方に設けた抜け止め突起の外接円径
より僅かに小さくしたことを特徴とするシャープペンシ
ルのチャックリング。1. A chuck ring made of metal such as brass, which is mounted on the outer periphery of a tapered core gripping portion of the chuck and is made by plastic working to directly contact the chuck to tighten the core gripping portion. A straight inner surface portion having a constant inner diameter serving as a tightening portion is provided at a front end portion for a required length, and a taper inner surface portion having a substantially uniform thickness and having a gradually decreasing inner diameter is continuously provided at a rear portion thereof. A chuck ring of a mechanical pencil, wherein a minimum inner diameter at a rear end position is slightly smaller than a circumscribed circle diameter of a retaining projection provided on the rear side of a chuck core gripping portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987178445U JPH088156Y2 (en) | 1987-11-24 | 1987-11-24 | Mechanical pencil chuck ring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987178445U JPH088156Y2 (en) | 1987-11-24 | 1987-11-24 | Mechanical pencil chuck ring |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0183585U JPH0183585U (en) | 1989-06-02 |
| JPH088156Y2 true JPH088156Y2 (en) | 1996-03-06 |
Family
ID=31470063
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987178445U Expired - Lifetime JPH088156Y2 (en) | 1987-11-24 | 1987-11-24 | Mechanical pencil chuck ring |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH088156Y2 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5839680A (en) * | 1981-09-02 | 1983-03-08 | Toyo Contact Lens Co Ltd | Synthesizing method of ketal derivative from glycerol allyl ether |
| JPS5912687U (en) * | 1982-07-15 | 1984-01-26 | 株式会社サクラクレパス | writing implements |
| JPH0415514Y2 (en) * | 1985-07-03 | 1992-04-07 | ||
| JPH051426Y2 (en) * | 1987-07-14 | 1993-01-14 |
-
1987
- 1987-11-24 JP JP1987178445U patent/JPH088156Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0183585U (en) | 1989-06-02 |
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