JPH07214980A - Sharp pencil - Google Patents
Sharp pencilInfo
- Publication number
- JPH07214980A JPH07214980A JP6026081A JP2608194A JPH07214980A JP H07214980 A JPH07214980 A JP H07214980A JP 6026081 A JP6026081 A JP 6026081A JP 2608194 A JP2608194 A JP 2608194A JP H07214980 A JPH07214980 A JP H07214980A
- Authority
- JP
- Japan
- Prior art keywords
- tip
- core detent
- detent member
- core
- tip member
- 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.)
- Granted
Links
Landscapes
- Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
Abstract
(57)【要約】
【構成】 軸筒の先端に先部材が配置され、その先部材
に芯戻り止め部材が挿着されたシャ−プペンシルであっ
て、前記芯戻り止め部材の後方に係止突起を形成し、そ
の係止突起の頂部に平坦部を形成したことと、軸筒の先
端に先部材が配置され、その先部材に芯戻り止め部材が
挿着されるシャ−プペンシルであって、前記先部材の内
壁面に芯戻り止め部材の脱落を防止する係止突起を、前
記先部材の切削過程で押圧棒により圧縮変形させること
により形成し、その後、前記芯戻り止め部材を挿着した
シャ−プペンシル。
【効果】 係止突起の突起高さのばらつきがなくなり安
定した芯戻り止め部材の脱落防止が図れる。また、係止
突起の形成作業、並びに挿着作業の容易性が図られ生産
性が飛躍的に向上するものである。
(57) [Summary] [Construction] A sharp pencil in which a tip member is arranged at the tip of a barrel, and a core detent member is inserted into the tip member, and the sharp pencil is locked behind the core detent member. A sharp pencil in which a projection is formed and a flat portion is formed on the top of the locking projection, and a tip member is arranged at the tip of the barrel and a core detent member is inserted into the tip member. , A locking projection for preventing the core detent member from falling off is formed on the inner wall surface of the tip member by compressing and deforming with a pressing rod in the cutting process of the tip member, and then the core detent member is inserted and attached. A sharp pencil. [Effect] There is no variation in the projection height of the locking projection, and stable prevention of the detent member from falling off can be achieved. In addition, the work of forming the locking projections and the work of inserting the locking projections are facilitated, and the productivity is dramatically improved.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、軸筒の先端に先部材が
配置され、その先部材に芯戻り止め部材が挿着されたシ
ャ−プペンシルに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sharp pencil in which a tip member is arranged at the tip of a barrel and a core detent member is inserted in the tip member.
【０００２】[0002]
【従来の技術】鉛芯を保持する芯戻り止め部材の脱落防
止構造の考案の１例として、実開昭５４−２７７３５号
公報が知られている。以下詳述すると、口金内には予め
鉛芯の保持を行う保持チャックが挿着されており、その
保持チャックの後端には略半円形状の係止突起が形成さ
れている。そして、その係止突起は、カシメ治具を口金
に圧入し、そのカシメ治具で内壁面を押圧変形させるこ
とにより形成しているものである。2. Description of the Related Art Japanese Unexamined Utility Model Publication No. 54-27735 is known as an example of a device for preventing a core detent member holding a lead core from falling off. More specifically, a holding chuck for holding the lead core is inserted in advance in the die, and a substantially semicircular locking protrusion is formed at the rear end of the holding chuck. The locking protrusion is formed by press-fitting a caulking jig into the die and pressing and deforming the inner wall surface with the caulking jig.
【０００３】また、芯戻り止め部材の脱落防止構造の他
の発明の例として、特開昭６２−２８００９号公報が知
られている。この発明は、芯戻り止め部材の脱落を防止
する係止突起を、芯戻り止め部材を先金に挿着する前に
切削により形成するものである。以下説明すると、最初
に先金の内側を第１治具により適宜の形状に形成後し、
次いで、先端に突状の外形部分が形成された第２治具を
細く形成された先金内に挿入し、その第２治具を偏心回
転させることにより三角形状の係止突起を形成してい
る。Further, Japanese Patent Laid-Open No. 62-28009 is known as another example of the invention of the fall prevention structure of the core detent member. According to the present invention, the locking projection for preventing the core detent member from falling off is formed by cutting before the core detent member is inserted into the tip metal. Explaining below, first the inside of the tip metal is formed into an appropriate shape by the first jig,
Then, a second jig having a projecting outer shape at the tip is inserted into a thin metal tip, and the second jig is eccentrically rotated to form a triangular locking projection. There is.
【０００４】[0004]
【発明が解決しようとする課題】しかし、従来技術の前
者においては、係止突起を形成し保持チャックが抜けに
くくはなったものの、その品質的な面でまだ問題があっ
た。その問題とは、係止突起の高さのばらつきである。
保持チャック挿着後、カシメ治具により先口の内壁面を
押圧変形させているだけなので、係止突起の高さにばら
つきが生じてしまう。この係止突起のばらつきにより、
係止突起が低い場合には保持チャックが脱落しやすくな
ってしまうものであった。また、係止突起が高すぎる場
合や係止突起の先端にバリが生じてしまった場合には、
鉛芯の挿通孔が塞がれ鉛芯の繰り出しが妨げられてしま
い筆記不能になってしまうものであった。また、後者に
おいては、生産性の面で問題があった。つまり、細く形
成された先金内に第２治具を挿入し、偏心回転させて内
面を円周状に切削することにより係止突起を形成してい
るので、切削速度を上げることはできず切削に非常な神
経と時間を費やしていた。また、第２治具は非常に細い
ため、切削刃の切れ味が悪くなりやすく、又、折損しや
すく頻繁に交換せねばならないものであった。However, in the former case of the prior art, although the holding projection was formed to make it difficult for the holding chuck to come off, there was still a problem in terms of its quality. The problem is the variation in the height of the locking projections.
After inserting the holding chuck, only the inner wall surface of the front opening is pressed and deformed by the caulking jig, so that the height of the locking protrusion varies. Due to the variation of this locking protrusion,
If the locking protrusion is low, the holding chuck is likely to fall off. Also, if the locking protrusion is too high or if the tip of the locking protrusion has burr,
The lead-hole insertion hole was blocked, which hindered the lead-core from being drawn out, making writing impossible. In the latter case, there was a problem in productivity. That is, the second jig is inserted into the thin metal tip, and the eccentric rotation is performed to cut the inner surface in a circumferential shape to form the locking projection, so that the cutting speed cannot be increased. I was spending a lot of nerves and time on cutting. In addition, since the second jig is very thin, the cutting blade is liable to have poor sharpness and is easily broken, and must be replaced frequently.
【０００５】[0005]
【課題を解決するための手段】本発明は、上記問題点に
鑑みなされたものであり、軸筒の先端に先部材が配置さ
れ、その先部材に芯戻り止め部材が挿着されたシャ−プ
ペンシルであって、前記芯戻り止め部材の後方に係止突
起を形成し、その係止突起の頂部に平坦部を形成したこ
と、また、軸筒の先端に先部材が配置され、その先部材
に芯戻り止め部材が挿着されるシャ−プペンシルであっ
て、前記先部材の内壁面に芯戻り止め部材の脱落を防止
する係止突起を、前記先部材の切削過程で押圧棒により
押圧変形させることにより形成し、その後、前記芯戻り
止め部材を挿着したことを要旨とするものである。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a shank in which a tip member is arranged at the tip of a barrel and a core detent member is inserted in the tip member. In the pen pencil, a locking projection is formed at the rear of the core detent member, and a flat portion is formed on the top of the locking projection, and a tip member is arranged at the tip of the barrel, and the tip member is A core pencil having a core detent member inserted thereinto, wherein a locking projection for preventing the core detent member from falling off is formed on the inner wall surface of the tip member by a pressing rod during the cutting process of the tip member. The gist is that the core detent member is inserted and then attached.
【０００６】[0006]
【実施例】１例を図１、図２に示し説明する。シャ−プ
ペンシルの軸筒１の先端には、真鍮部材の表面にニッケ
ルクロムメッキなどを施した先部材２が螺合や圧入など
により固定されている。その先部材２の先端には、芯保
護管３が圧入固定されているが、芯保護管３は先部材２
と一体であってもよい。また、前記軸筒１の内部には、
チャック体４とそのチャック体４を開閉するチャックリ
ング５などからなる鉛芯繰り出し機構６が前後動可能に
配置されている。さらに、前記先部材２の内側には、鉛
芯繰出し時その鉛芯の後退を防止する芯戻り止め部材７
が挿着されている。EXAMPLE An example will be described with reference to FIGS. A tip member 2 in which the surface of a brass member is plated with nickel chrome is fixed to the tip of the shaft cylinder 1 of the sharp pencil by screwing or press fitting. The lead protection tube 3 is press-fitted and fixed to the tip of the tip member 2.
May be integrated with. In addition, inside the barrel 1,
A lead core feeding mechanism 6 including a chuck body 4 and a chuck ring 5 that opens and closes the chuck body 4 is arranged to be movable back and forth. Further, inside the tip member 2, a core detent member 7 for preventing the lead core from retracting when the lead core is fed out.
Has been inserted.
【０００７】その芯戻り止め部材７の後方には、係止突
起８が円周状に形成されており、芯戻り止め部材７の先
部材２からの脱落を防止している。次ぎにその係止突起
８の具体的な形状について詳述する。芯戻り止め部材７
の後端側より、断面が扇状の第１の曲面部９に連設して
頂部となる一定距離の平坦部１０が形成されている。そ
して、その平坦部１０に連設して第１の曲面部９より曲
率半径が大なる第２の曲面部１１が形成されており、そ
の第２の曲面部１１に連設して膨出部８ａが形成されて
いる（図２参照）。A locking projection 8 is circumferentially formed behind the core detent member 7 to prevent the core detent member 7 from falling off the tip member 2. Next, the specific shape of the locking projection 8 will be described in detail. Core detent member 7
From the rear end side, a flat portion 10 is formed which is continuous with the first curved surface portion 9 having a fan-shaped cross section and which serves as a top portion with a constant distance. Then, a second curved surface portion 11 having a larger radius of curvature than the first curved surface portion 9 is formed continuously with the flat portion 10, and the second curved surface portion 11 is continuously provided with a bulging portion. 8a is formed (see FIG. 2).
【０００８】次ぎに作用について説明する。先部材２に
芯戻り止め部材７を挿着するときには、膨出部８ａを通
して曲率半径が大なる第２の曲面部１１より容易に圧入
することができる。また、芯戻り止め部材７の挿着後
は、芯戻り止め部材７の後端が第２の曲面部１１より曲
率半径の小さい第１の曲面部９に係止しているため脱落
しにくい。また、平坦部１０を形成することにより係止
突起８の高さが一定になる。Next, the operation will be described. When the core detent member 7 is inserted into the tip member 2, it can be easily press-fitted through the bulging portion 8a from the second curved surface portion 11 having a large radius of curvature. Further, after the core detent member 7 is attached, the rear end of the core detent member 7 is locked to the first curved surface portion 9 having a smaller radius of curvature than the second curved surface portion 11, so that it does not easily come off. Further, by forming the flat portion 10, the height of the locking projection 8 becomes constant.
【０００９】次ぎに係止突起８の形成方法の１例につい
て説明する。最初に先部材２を形成する金属製の棒状部
材１２を一般的なタレット旋盤やＮＣ（ニュ−メリック
コントロ−ル）旋盤１３などに固定する。次いで、棒状
部材１２の内側を先部材２の内側の形状にバイト（切削
刃：図示せず）により切削形成する（図３参照）。次い
で、切削した棒状部材１２の内側に押圧棒１４を圧接
し、摺り鉢状の変形部１２ａをつぶすように押圧変形さ
せることにより係止突起８を形成する（図４参照）。
尚、押圧棒１４は、摺り鉢状の変形部１２ａに沿って導
かれ、正確に位置決めされるものである。その押圧棒１
４の形状は、先端側より、小径部１５と大径部１６とよ
り構成されており、その小径部と大径部の連設部１７
は、前記第２の曲面部１１と同形の曲面部に形成されて
いる。また、押圧棒１４の小径部１５と大径部１６は、
先部材２の内側の内径よりも小さく設定されており、そ
の大径部１６で変形部１２ａを変形せしめ、小径部１５
で係止突起８の高さを一定に形成している。最後に棒状
部材１２の外形を切削し、外形を先部材２の形状に整え
る。尚、本実施例においては、押圧棒１４の連設部１７
を曲面部としたが、傾斜角度をもたせた直線部としても
よい。言うまでもないが、この場合、係止突起８の第２
の曲面部１１は、曲面ではなく傾斜角度のある直線部と
なるNext, an example of a method of forming the locking projection 8 will be described. First, the metal rod-shaped member 12 forming the tip member 2 is fixed to a general turret lathe, an NC (numeric control) lathe 13, or the like. Next, the inside of the rod-shaped member 12 is cut and formed into the shape of the inside of the tip member 2 with a cutting tool (cutting blade: not shown) (see FIG. 3). Next, the pressing rod 14 is pressed against the inside of the cut rod-shaped member 12, and the locking protrusion 8 is formed by pressing and deforming the mortar-shaped deforming portion 12a so as to crush it (see FIG. 4).
The pressing rod 14 is guided along the mortar-shaped deforming portion 12a and is accurately positioned. The push rod 1
The shape of No. 4 is composed of a small diameter portion 15 and a large diameter portion 16 from the front end side, and a connecting portion 17 of the small diameter portion and the large diameter portion.
Is formed on a curved surface portion having the same shape as the second curved surface portion 11. Further, the small diameter portion 15 and the large diameter portion 16 of the pressing rod 14 are
The inside diameter of the tip member 2 is set to be smaller than that of the inside diameter.
The height of the locking projection 8 is formed to be constant. Finally, the outer shape of the rod-shaped member 12 is cut to adjust the outer shape to the shape of the tip member 2. Incidentally, in this embodiment, the connecting portion 17 of the pressing rod 14 is
Is a curved surface portion, it may be a straight line portion having an inclination angle. Needless to say, in this case,
The curved surface portion 11 is not a curved surface but a linear portion having an inclination angle.
【００１０】また、前記実施例では、係止突起８を少な
い押圧力で容易に形成するために、先部材２となる棒状
部材１２を回転させながら円周状に形成したが、棒状部
材１２の回転を停止させ図５に示すように部分的（２個
所〜６個所）に形成してもよい。部分的に係止突起８を
形成することにより、品質検査などを行うために先部材
２の内径寸法を測定する際、各係止突起８の間（非形成
部）から容易に測定することができる。Further, in the above-described embodiment, in order to easily form the locking projection 8 with a small pressing force, the rod-shaped member 12 serving as the tip member 2 is formed in a circular shape while being rotated. The rotation may be stopped to form a part (2 to 6 places) as shown in FIG. By forming the locking projections 8 partially, when measuring the inner diameter of the front member 2 for quality inspection or the like, it is possible to easily measure from between the locking projections 8 (non-formed portion). it can.
【００１１】[0011]
【発明の効果】本発明は、軸筒の先端に先部材が配置さ
れ、その先部材に芯戻り止め部材が挿着されたシャ−プ
ペンシルであって、前記芯戻り止め部材の後方に係止突
起を形成し、その係止突起の頂部に平坦部を形成したこ
と、また、軸筒の先端に先部材が配置され、その先部材
に芯戻り止め部材が挿着されるシャ−プペンシルであっ
て、前記先部材の内壁面に芯戻り止め部材の脱落を防止
する係止突起を、前記先部材の切削過程で押圧棒により
押圧変形させることにより形成し、その後、前記芯戻り
止め部材を挿着したので、係止突起の突起高さのばらつ
きがなくなり安定した芯戻り止め部材の脱落防止が図れ
る。また、係止突起の形成作業、並びに挿着作業の容易
性が図られ生産性が飛躍的に向上するものである。The present invention is a sharp pencil in which a tip member is arranged at the tip of a shaft cylinder, and a core detent member is inserted into the tip member. The sharp pencil is retained behind the core detent member. A sharp pencil in which a protrusion is formed and a flat portion is formed on the top of the locking protrusion, and a tip member is arranged at the tip of the barrel and a core detent member is inserted into the tip member. Then, a locking projection for preventing the core detent member from falling off is formed on the inner wall surface of the tip member by pressing and deforming it with a pressing rod in the cutting process of the tip member, and then the core detent member is inserted. Since it is attached, there is no variation in the projection height of the locking projection, and stable prevention of the core detent member from falling can be achieved. In addition, the work of forming the locking projections and the work of inserting the locking projections are facilitated, and the productivity is dramatically improved.
【図１】本発明の実施例を示す縦断面図である。FIG. 1 is a vertical sectional view showing an embodiment of the present invention.
【図２】図１に相当するＡ部拡大図である。FIG. 2 is an enlarged view of part A corresponding to FIG.
【図３】本発明の形成方法を示す縦断面図である。FIG. 3 is a vertical sectional view showing a forming method of the present invention.
【図４】図３に相当する次ぎの動作を示す縦断面図であ
る。FIG. 4 is a vertical sectional view showing a next operation corresponding to FIG.
【図５】係止突起の他の例を示す縦断面図である。FIG. 5 is a vertical cross-sectional view showing another example of the locking projection.
【図６】図５に相当するＢ−Ｂ線横断面図である。6 is a cross-sectional view taken along the line BB corresponding to FIG.
１ 軸筒 ２ 先部材 ３ 芯保護管 ４ チャック体 ５ チャックリング ６ 鉛芯繰り出し機構 ７ 芯戻り止め部材 ８ 係止突起 ８ａ 膨出部 ９ 第１の曲面部 １０ 平坦部（頂部） １１ 第２の曲面部 １２ 棒状部材 １２ａ 変形部 １３ 旋盤 １４ 押圧棒 DESCRIPTION OF SYMBOLS 1 Shaft cylinder 2 Tip member 3 Core protection tube 4 Chuck body 5 Chuck ring 6 Lead core feeding mechanism 7 Core detent member 8 Locking protrusion 8a Swelling portion 9 First curved surface portion 10 Flat portion (top portion) 11 Second Curved part 12 Bar-shaped member 12a Deformation part 13 Lathe 14 Push bar
Claims (2)
部材に芯戻り止め部材が挿着されたシャ−プペンシルで
あって、前記芯戻り止め部材の後方に係止突起を形成
し、その係止突起の頂部に平坦部を形成したことを特徴
とするシャ−プペンシル。1. A sharp pencil in which a tip member is arranged at the tip of a barrel and a core detent member is inserted into the tip member, wherein a locking projection is formed behind the core detent member. A sharp pencil having a flat portion formed on the top of the locking projection.
部材に芯戻り止め部材が挿着されるシャ−プペンシルで
あって、前記先部材の内壁面に芯戻り止め部材の脱落を
防止する係止突起を、前記先部材の切削過程で押圧棒に
より押圧変形させることにより形成し、その後、前記芯
戻り止め部材を挿着したことを特徴とするシャ−プペン
シル。2. A sharp pencil in which a tip member is arranged at the tip of a barrel, and a core detent member is inserted into the tip member, wherein the core detent member is detached from the inner wall surface of the tip member. A sharpening pencil characterized in that a locking projection for preventing is formed by pressing and deforming by a pressing rod in the cutting process of the tip member, and then the core detent member is inserted and attached.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02608194A JP3458440B2 (en) | 1994-01-28 | 1994-01-28 | Sharp pencil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02608194A JP3458440B2 (en) | 1994-01-28 | 1994-01-28 | Sharp pencil |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07214980A true JPH07214980A (en) | 1995-08-15 |
| JP3458440B2 JP3458440B2 (en) | 2003-10-20 |
Family
ID=12183686
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02608194A Expired - Fee Related JP3458440B2 (en) | 1994-01-28 | 1994-01-28 | Sharp pencil |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3458440B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020001378A (en) * | 2018-06-22 | 2020-01-09 | 有限会社中山金属工業 | Core for mechanical pencil and method for producing the same |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51159536U (en) * | 1975-06-11 | 1976-12-18 | ||
| JPS52149744U (en) * | 1976-05-08 | 1977-11-14 | ||
| JPS5376049U (en) * | 1976-11-26 | 1978-06-24 | ||
| JPS5378139U (en) * | 1976-11-30 | 1978-06-29 | ||
| JPS53103336U (en) * | 1977-01-26 | 1978-08-19 | ||
| JPS5427735U (en) * | 1977-07-27 | 1979-02-23 | ||
| JPS62280090A (en) * | 1986-05-30 | 1987-12-04 | ぺんてる株式会社 | Manufacture of tip made of metal for propelling pencil |
| JPH0234293U (en) * | 1988-08-30 | 1990-03-05 |
-
1994
- 1994-01-28 JP JP02608194A patent/JP3458440B2/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51159536U (en) * | 1975-06-11 | 1976-12-18 | ||
| JPS52149744U (en) * | 1976-05-08 | 1977-11-14 | ||
| JPS5376049U (en) * | 1976-11-26 | 1978-06-24 | ||
| JPS5378139U (en) * | 1976-11-30 | 1978-06-29 | ||
| JPS53103336U (en) * | 1977-01-26 | 1978-08-19 | ||
| JPS5427735U (en) * | 1977-07-27 | 1979-02-23 | ||
| JPS62280090A (en) * | 1986-05-30 | 1987-12-04 | ぺんてる株式会社 | Manufacture of tip made of metal for propelling pencil |
| JPH0234293U (en) * | 1988-08-30 | 1990-03-05 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020001378A (en) * | 2018-06-22 | 2020-01-09 | 有限会社中山金属工業 | Core for mechanical pencil and method for producing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3458440B2 (en) | 2003-10-20 |
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