JP4540103B2 - mechanical pencil - Google Patents

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Publication number
JP4540103B2
JP4540103B2 JP2004272830A JP2004272830A JP4540103B2 JP 4540103 B2 JP4540103 B2 JP 4540103B2 JP 2004272830 A JP2004272830 A JP 2004272830A JP 2004272830 A JP2004272830 A JP 2004272830A JP 4540103 B2 JP4540103 B2 JP 4540103B2
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base
lead
rib
core
guide
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JP2006088343A (en
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幹夫 小島
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Pilot Corp KK
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Pilot Corp KK
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  • Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)

Description

本発明は、芯ホルダーを内蔵した芯ガイドを口金の前部に圧入固着したシャープペンシルに関する。   The present invention relates to a mechanical pencil in which a lead guide with a built-in lead holder is press-fitted and fixed to the front part of a base.

従来、先端キャップ６（口金に該当）の内部中心部には、心の把持歩進機構８の一端から外方に連通する比較的太径の連通孔１１が形成されている。そして、この連通孔１１には、外方から心ガイドパイプ１２（芯ガイドに該当）が嵌装されるようになっている。この心ガイドパイプ１２は、内部中心に心ガイド孔１３を有する小径部１４と、内部に心の戻り止め用のストッパーリング１５（芯ホルダーに該当）を嵌装した太径部１６とからなっており、この太径部１６に、嵌合部１７を形成し、この嵌合部１７を前記先端キャップ６の前記連通孔１１に嵌合することにより、支持固定されている。この時、連通孔１１の内方の係止部１８に、ガイドパイプ１２の嵌合部後端に形成した係合突部１９を圧入後、係合させることにより強固に係止することができるシャープペンシルが知られている。（特許文献１参照）
実開昭５２−１５９３３号公報（第３−４頁、第２図） Conventionally, a communication hole 11 having a relatively large diameter that communicates outward from one end of the gripping and stepping mechanism 8 of the heart is formed in the inner central portion of the tip cap 6 (corresponding to a cap). A center guide pipe 12 (corresponding to a core guide) is fitted into the communication hole 11 from the outside. The center guide pipe 12 includes a small-diameter portion 14 having a center guide hole 13 at the center of the inside, and a large-diameter portion 16 fitted with a stopper ring 15 (corresponding to a core holder) for preventing detent of the core. In addition, a fitting portion 17 is formed in the large-diameter portion 16, and the fitting portion 17 is fitted and fixed in the communication hole 11 of the tip cap 6. At this time, the engagement protrusion 19 formed at the rear end of the fitting portion of the guide pipe 12 is press-fitted into the inner locking portion 18 of the communication hole 11 and can be firmly locked by engaging. Mechanical pencils are known. (See Patent Document 1)
Japanese Utility Model Publication No. 52-15933 (page 3-4, Fig. 2)

上記したシャープペンシルは、先端キャップ６の連通孔１１にガイドパイプ１２の係合突部１５を圧入する時、連通孔１１が広がってしまい、連通孔１１と嵌合部１７に隙間が生じてしまう恐れがあった。すると、筆記時にガイドパイプ１２に横方向の応力が生じると揺動してしまい、非常に筆記しにくくなってしまうものであった。また、先端キャップ６を合成樹脂で構成し、ガイドパイプ１２を金属で構成した場合には、先端キャップ６の連通孔１１にガイドパイプ１２の係合突部１５を圧入する時、先端キャップ６が割れたりクラックが発生してしまう恐れがあった。   In the mechanical pencil described above, when the engagement protrusion 15 of the guide pipe 12 is press-fitted into the communication hole 11 of the tip cap 6, the communication hole 11 expands, and a gap is generated between the communication hole 11 and the fitting part 17. There was a fear. Then, when a lateral stress is generated in the guide pipe 12 during writing, the guide pipe 12 swings, and writing becomes very difficult. Further, when the tip cap 6 is made of synthetic resin and the guide pipe 12 is made of metal, when the engagement protrusion 15 of the guide pipe 12 is press-fitted into the communication hole 11 of the tip cap 6, the tip cap 6 There was a risk of cracking or cracking.

本発明は、チャックを前進させることにより芯を繰り出すシャープペンシルにおいて、軸筒の前部に合成樹脂製の口金を取り付け、口金内を前記チャックが前進するとともに、口金の内面に長手方向に伸びたリブを複数形成し、かつ、前記リブの前方に先端孔を形成し、この先端孔の内径よりもリブの最前部の内接円の直径を小さく構成し、更に、金属製の芯ガイドの後部に後端部が傾斜された係止鍔を形成し、この係止鍔を口金の先端孔より細径に構成し、前記芯ガイドの係止鍔を口金の最前部のリブに圧入固着し、この芯ガイド内に芯を適度の力で保持する芯ホルダーを内蔵したことを要旨とする。 The present invention relates to a mechanical pencil that feeds a lead by advancing a chuck, and a base made of a synthetic resin is attached to the front portion of the shaft cylinder, and the chuck advances in the base and extends in the longitudinal direction on the inner surface of the base. A plurality of ribs are formed , a tip hole is formed in front of the ribs , and the diameter of the inscribed circle at the foremost part of the rib is smaller than the inner diameter of the tip hole, and the rear part of the metal core guide Forming a locking hook whose rear end portion is inclined, and forming the locking hook with a diameter smaller than the tip hole of the base, and press-fixing the locking hook of the core guide to the frontmost rib of the base, The gist is that a lead holder for holding the lead with an appropriate force is built in the lead guide.

本発明のシャープペンシルは、芯ガイド内に芯ホルダーを内蔵するので、短くなった芯でも芯ホルダーによって保持でき、残芯として排出される芯が短くなり経済的である。更に、口金のリブに芯ガイドの後部を圧入固着するので、芯ガイドの後部を圧入する時リブが外方ではなく両側に変形され、リブの内面と芯ガイドの後部に隙間が発生しにくくなる。したがって、長期に渡って筆記を繰り返しても、芯ガイドが揺動する恐れがないという利点がある。また、合成樹脂製の口金に金属製の芯ガイドの後部を圧入固着しても、口金が割れたりクラックが発生する恐れがなくなるものである。   The mechanical pencil of the present invention incorporates a lead holder in the lead guide, so that even a shortened lead can be held by the lead holder, and the lead discharged as a remaining lead is shortened, which is economical. Furthermore, since the rear part of the core guide is press-fitted and fixed to the rib of the base, when the rear part of the core guide is press-fitted, the rib is deformed not on the outside but on both sides, and a gap is hardly generated between the inner surface of the rib and the rear part of the core guide. . Therefore, there is an advantage that even if writing is repeated over a long period of time, the lead guide does not have a possibility of swinging. Further, even if the rear portion of the metal core guide is press-fitted and fixed to the synthetic resin base, there is no risk of the base cracking or cracking.

口金のリブに芯ガイドの後部を圧入固着することにより、筆記時に芯ガイドが揺動しないシャープペンシルを実現した。   By press-fitting and fixing the rear part of the lead guide to the rib of the base, a mechanical pencil that does not swing when writing is realized.

図１および図２により本発明の実施例１のシャープペンシルを説明する。尚、図１の左側を前方とし、右側を後方とする。先ず、合成樹脂製の口金１の内面に長手方向に伸びたリブ１Ａを等間隔に６個形成する。このリブ１Ａには、固定具２を挟持する段部１Ｂと、締具３を受け止める係止段１Ｃと、チャック４を受け止める受段１Ｄが形成される。また、リブ１Ａの最前部１Ｅの内接円の直径は先端孔１Ｆの内径よりも小さく構成される。更に、口金１の後部には雌ネジ部１Ｇが形成される。金属製の芯ガイド５は、先端部５Ａが略円錐形に形成されるとともに、芯６が通過可能な貫通孔５Ｂが形成される。この芯ガイド５には中間孔５Ｃと後部孔５Ｄが形成され、外面には外鍔部５Ｅと筒状の後部５Ｆが形成される。この後部５Ｆに後端部が傾斜された係止鍔５Ｇを形成する。更に、芯ガイド５の後部孔５Ｄにゴム製の芯ホルダー７を圧入して取り付け、芯ガイド５の中間孔５Ｃに位置する芯ホルダー７の保持部７Ａにより芯６を適度の力で保持する。   A mechanical pencil according to Example 1 of the present invention will be described with reference to FIGS. In addition, let the left side of FIG. 1 be the front, and let the right side be back. First, six ribs 1A extending in the longitudinal direction are formed at equal intervals on the inner surface of the base 1 made of synthetic resin. The rib 1A is formed with a stepped portion 1B for holding the fixture 2, a locking step 1C for receiving the fastener 3, and a receiving step 1D for receiving the chuck 4. Further, the diameter of the inscribed circle of the foremost portion 1E of the rib 1A is configured to be smaller than the inner diameter of the tip hole 1F. Furthermore, a female screw portion 1G is formed at the rear portion of the base 1. The metal core guide 5 has a tip portion 5A formed in a substantially conical shape and a through hole 5B through which the core 6 can pass. The core guide 5 is formed with an intermediate hole 5C and a rear hole 5D, and an outer flange portion 5E and a cylindrical rear portion 5F are formed on the outer surface. A locking rod 5G whose rear end is inclined is formed on the rear portion 5F. Further, a rubber core holder 7 is press-fitted and attached to the rear hole 5D of the core guide 5, and the core 6 is held with an appropriate force by the holding portion 7A of the core holder 7 located in the intermediate hole 5C of the core guide 5.

この芯ガイド５を前記口金１の先端から挿入し、芯ガイド５の係止鍔５Ｇを口金１の最前部１Ｅのリブ１Ａに圧入固着する。この時、芯ガイド５の係止鍔５Ｇは口金１の先端孔１Ｆより細径に構成されているので、口金１の先端孔１Ｆを変形する心配はない。   The core guide 5 is inserted from the tip of the base 1, and the locking rod 5 G of the core guide 5 is press-fitted and fixed to the rib 1 A of the foremost part 1 E of the base 1. At this time, the locking rod 5G of the core guide 5 is configured to have a diameter smaller than that of the tip hole 1F of the base 1, so there is no fear that the tip hole 1F of the base 1 is deformed.

次に、チャック４、締具３、固定具２、スプリング８および芯タンク９からなる機構部を軸筒１０の前方より挿入し、軸筒１０の前部に固定具２の後部２Ａを挿入する。この軸筒１０の雄ネジ部１０Ａに前記口金１の雌ネジ部１Ｇを螺合し、リブ１Ａの段部１Ｂと軸筒１０の前端により固定具２の外鍔２Ｂを挟持し、ノック式のシャープペンシルを構成する。   Next, a mechanism portion including the chuck 4, the fastener 3, the fixture 2, the spring 8 and the core tank 9 is inserted from the front of the shaft tube 10, and the rear portion 2 </ b> A of the fixture 2 is inserted into the front portion of the shaft tube 10. . The female screw portion 1G of the base 1 is screwed into the male screw portion 10A of the shaft tube 10, and the outer flange 2B of the fixture 2 is sandwiched between the step portion 1B of the rib 1A and the front end of the shaft tube 10, and a knock type Make up a mechanical pencil.

以上説明したシャープペンシルは、ノックによりチャック４を前進させて芯６を繰り出すと、締具３がリブ１Ａの係止段１Ｃに当接されてチャック４の頭部４Ａから締具３を外すとともに、チャック４の前端がリブ１Ａの受段１Ｄに当接されてチャック４が停止される。そして、筆記中の芯６が短くなっても芯ガイド５の先端近くまで芯ホルダー７によって保持されるので、次の芯６で短くなった芯６を押すことにより筆記が行える。したがって、残芯として排出される芯６は芯ガイド５の先端から芯ホルダー７の前端までの長さとなり、残芯の長さは非常に短くなる。   In the mechanical pencil described above, when the chuck 4 is advanced by knocking and the lead 6 is fed out, the fastener 3 is brought into contact with the locking step 1C of the rib 1A to remove the fastener 3 from the head 4A of the chuck 4. The front end of the chuck 4 is brought into contact with the receiving step 1D of the rib 1A, and the chuck 4 is stopped. And even if the lead 6 being written is shortened, it is held by the lead holder 7 to the vicinity of the tip of the lead guide 5, so that writing can be performed by pressing the shortened lead 6 with the next lead 6. Therefore, the core 6 discharged as the remaining core has a length from the tip of the core guide 5 to the front end of the core holder 7, and the length of the remaining core becomes very short.

口金に揺動することなく芯ガイドが取り付けられ、この芯ガイド内に芯ホルダーを内蔵するので残芯の長さが非常に短くなるシャープペンシルに適用できる。   The lead guide is attached to the base without swinging, and the lead holder is built in the lead guide, so that the length of the remaining lead can be applied to a mechanical pencil that becomes very short.

本発明の実施例１のシャープペンシルを示す主要部断面図である。（実施例１）It is principal part sectional drawing which shows the mechanical pencil of Example 1 of this invention. Example 1 図１のＡ−Ａ線を示す拡大断面図である。（実施例１）It is an expanded sectional view which shows the AA line of FIG. Example 1

符号の説明Explanation of symbols

１ 口金
１Ａ 口金１のリブ
１Ｆ 口金１の先端孔
４ チャック
５ 芯ガイド
５Ｆ 芯ガイド５の後部
５Ｇ 芯ガイド５の係止鍔
６ 芯
７ 芯ホルダー
１０ 軸筒 DESCRIPTION OF SYMBOLS 1 Base 1A Rib of base 1 1F Tip hole of base 1 4 Chuck 5 Core guide 5F Rear part of core guide 5G Locking rod of core guide 5 6 Core 7 Core holder 10 Shaft cylinder

Claims (1)

チャックを前進させることにより芯を繰り出すシャープペンシルにおいて、軸筒の前部に合成樹脂製の口金を取り付け、口金内を前記チャックが前進するとともに、口金の内面に長手方向に伸びたリブを複数形成し、かつ、前記リブの前方に先端孔を形成し、この先端孔の内径よりもリブの最前部の内接円の直径を小さく構成し、更に、金属製の芯ガイドの後部に後端部が傾斜された係止鍔を形成し、この係止鍔を口金の先端孔より細径に構成し、前記芯ガイドの係止鍔を口金の最前部のリブに圧入固着し、この芯ガイド内に芯を適度の力で保持する芯ホルダーを内蔵したことを特徴とするシャープペンシル。 In a mechanical pencil that feeds the lead by advancing the chuck, a synthetic resin base is attached to the front of the shaft cylinder, and the chuck advances in the base, and a plurality of ribs extending in the longitudinal direction are formed on the inner surface of the base And a front end hole is formed in front of the rib, the diameter of the inscribed circle at the foremost part of the rib is made smaller than the inner diameter of the front end hole, Is formed with a diameter smaller than the distal end hole of the base, and the locking hook of the core guide is press-fitted and fixed to the foremost rib of the base . A mechanical pencil with a built-in lead holder that holds the lead with an appropriate force.
JP2004272830A 2004-09-21 2004-09-21 mechanical pencil Expired - Fee Related JP4540103B2 (en)

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JP4540103B2 true JP4540103B2 (en) 2010-09-08

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5750886B2 (en) * 2010-12-28 2015-07-22 ぺんてる株式会社 mechanical pencil

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5215933U (en) * 1975-07-18 1977-02-04
JPS6319174Y2 (en) * 1982-07-30 1988-05-30
JPH0623788U (en) * 1992-08-28 1994-03-29 ぺんてる株式会社 Ball pen refill
JPH0675780U (en) * 1993-04-05 1994-10-25 パイロットインキ株式会社 Writing crown attachment structure
JPH0716472Y2 (en) * 1988-03-04 1995-04-19 三菱鉛筆株式会社 Fixing device for metal pipes and resin parts in writing instruments
JPH09226287A (en) * 1996-02-21 1997-09-02 Pilot Ink Co Ltd Manufacture of ballpoint pen refill
JP2001071678A (en) * 1999-09-01 2001-03-21 Pilot Precision Co Ltd Push-button type mechanical pencil

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5215933U (en) * 1975-07-18 1977-02-04
JPS6319174Y2 (en) * 1982-07-30 1988-05-30
JPH0716472Y2 (en) * 1988-03-04 1995-04-19 三菱鉛筆株式会社 Fixing device for metal pipes and resin parts in writing instruments
JPH0623788U (en) * 1992-08-28 1994-03-29 ぺんてる株式会社 Ball pen refill
JPH0675780U (en) * 1993-04-05 1994-10-25 パイロットインキ株式会社 Writing crown attachment structure
JPH09226287A (en) * 1996-02-21 1997-09-02 Pilot Ink Co Ltd Manufacture of ballpoint pen refill
JP2001071678A (en) * 1999-09-01 2001-03-21 Pilot Precision Co Ltd Push-button type mechanical pencil

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