JP7219600B2 - Mechanical pencil unit and retractable writing instrument - Google Patents

Mechanical pencil unit and retractable writing instrument Download PDF

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JP7219600B2
JP7219600B2 JP2018229114A JP2018229114A JP7219600B2 JP 7219600 B2 JP7219600 B2 JP 7219600B2 JP 2018229114 A JP2018229114 A JP 2018229114A JP 2018229114 A JP2018229114 A JP 2018229114A JP 7219600 B2 JP7219600 B2 JP 7219600B2
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lead
mechanical pencil
chuck
pencil unit
sliding contact
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JP2020090049A (en
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之博 月岡
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Zebra Co Ltd
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Zebra Co Ltd
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Description

本発明は、シャープペンシル用リフィールやシャープペンシル等を構成するシャープペンシルユニット、及び該シャープペンシルユニットを具備した出没式筆記具に関するものである。 The present invention relates to a mechanical pencil unit constituting a refill for a mechanical pencil, a mechanical pencil, etc., and a retractable writing instrument equipped with the mechanical pencil unit.

従来、この種の発明に関連し、例えば特許文献1には、保持筒と、保持筒の前側開口部に挿通されてこの保持筒の前端から前方へ突出するとともにこの保持筒に対し進退可能に支持されたホルダーと、ホルダーに挿通される鉛芯を前方へ繰り出す鉛芯繰出し機構と、鉛芯からホルダーに加わる径方向の力によりこのホルダーを保持筒及び鉛芯に相対し前進させる運動方向変換機構とを備えたシャープペンシルユニットが記載されている。そして、このシャープペンシルユニットを軸筒に収容して出没式筆記具を構成することが可能である。
この出没式筆記具によれば、所定の操作によりシャープペンシルユニットを前進させて、このシャープペンシルユニットの前端のホルダーを軸筒前端の開口から突出させた状態において、ホルダーから突出した鉛芯に径方向の力が加わると、ホルダーが保持筒及び鉛芯に相対して前進するため、このホルダーにより鉛芯を覆い保護することができる。
また、所定の操作により後端側の芯タンク部を保持筒に相対し進退させれば、鉛芯繰出し機構を作動させて鉛芯を繰出すことができる。
Conventionally, in relation to this type of invention, for example, in Patent Document 1, there is disclosed a holding cylinder, a holding cylinder inserted through a front opening of the holding cylinder, projecting forward from the front end of the holding cylinder, and being able to move forward and backward relative to the holding cylinder. A holder that is supported, a lead lead feeding mechanism that advances the lead core that is inserted into the holder, and a movement direction change that moves the holder forward relative to the holding cylinder and the lead core by the radial force applied from the lead core to the holder. A mechanical pencil unit with a mechanism is described. Then, it is possible to construct a retractable writing instrument by housing this mechanical pencil unit in the barrel.
According to this retractable writing instrument, the mechanical pencil unit is advanced by a predetermined operation, and in a state in which the holder at the front end of the mechanical pencil unit protrudes from the opening at the front end of the barrel, the lead core protruding from the holder is radially moved. When the force is applied, the holder advances relative to the holding cylinder and the lead core, so that the lead core can be covered and protected by the holder.
Further, by moving the lead tank portion on the rear end side toward and away from the holding cylinder by a predetermined operation, the lead lead feeding mechanism can be operated and the lead lead can be fed.

特開2017-159579号公報JP 2017-159579 A

しかしながら、上記従来技術によれば、進退する芯タンク部が、保持筒との係合部分で削れたり、摩耗したりするおそれがある。特に、保持筒に対し芯タンク部が径方向にがたつく場合には、前記係合部分における削れや摩耗等が著しくなる。 However, according to the above-described prior art, there is a possibility that the advancing and retracting lead tank portion may be scraped or worn at the engaging portion with the holding cylinder. In particular, when the lead tank portion rattles in the radial direction with respect to the holding cylinder, scraping and abrasion of the engaging portion become significant.

このような課題に鑑みて、本発明は、以下の構成を具備するものである。
保持筒の後端側に挿通された芯タンク部を進退させて鉛芯を繰出すようにしたシャープペンシルユニットにおいて、前記保持筒の後端には、径方向内側へ突出する円環状の係合部が設けられ、前記芯タンク部の外周部には、前記係合部よりも前側で前記保持筒の内周面に摺接する第1の摺接部と、前記第1の摺接部よりも後側で径方向内側へ円筒状に凹んだ凹部と、前記凹部よりも後側で前記凹部の底面に対し拡径された挿入筒部とが設けられ、前記凹部は、前記係合部の突端よりも径方向内側に底部を配置するとともに、前記芯タンク部が進退するストローク以上の長さに形成されていることを特徴とするシャープペンシルユニット。
In view of such problems, the present invention comprises the following configurations.
In a mechanical pencil unit in which a lead tank inserted into the rear end side of a holding cylinder advances and retracts to feed out a lead lead, the rear end of the holding cylinder is engaged with an annular ring protruding radially inward. A first sliding contact portion is provided on the outer peripheral portion of the lead tank portion and is in sliding contact with the inner peripheral surface of the holding cylinder on the front side of the engaging portion. A recess that is cylindrically recessed radially inward on the rear side , and an insertion tube portion that is wider than the bottom surface of the recess on the rear side of the recess , and the recess is the tip end of the engaging portion. A mechanical pencil unit, wherein a bottom portion is disposed radially inwardly of the lead tank portion, and the length of the lead tank portion is equal to or longer than a stroke of advancing and retracting.

本発明は、以上説明したように構成されているので、芯タンク部の削れや摩耗等を防ぐことができる。 Since the present invention is configured as described above, it is possible to prevent shaving, wear, and the like of the lead tank portion.

本発明に係るシャープペンシルユニットの一例を示す断面図である。1 is a cross-sectional view showing an example of a mechanical pencil unit according to the present invention; FIG. 同シャープペンシルユニットについて、芯タンク部を前進させた状態を(a)~(c)に順次に示す断面図である。3A to 3C are cross-sectional views sequentially showing states in which the lead tank portion is advanced in the same mechanical pencil unit. 図1の(III)-(III)線に沿う断面図である。FIG. 2 is a cross-sectional view taken along line (III)-(III) in FIG. 1; 芯タンク案内部材を示す断面図である。FIG. 4 is a cross-sectional view showing a wick tank guide member; 同シャープペンシルユニットを具備した筆記具の一例を示す内部構造図である。It is an internal structure diagram showing an example of a writing instrument equipped with the same mechanical pencil unit.

本実施の形態では、以下の特徴を開示している。
第1の特徴は、保持筒の後端側に挿通された芯タンク部を進退させて鉛芯を繰出すようにしたシャープペンシルユニットにおいて、前記保持筒の後端には、径方向内側へ突出する円環状の係合部が設けられ、前記芯タンク部の外周部には、前記係合部よりも前側で前記保持筒の内周面に摺接する第1の摺接部と、第1の摺接部よりも後側で径方向内側へ円筒状に凹んだ凹部とが設けられ、前記凹部は、前記係合部の突端よりも径方向内側に底部を配置するとともに、前記芯タンク部が進退するストローク以上の長さに形成されている(図1~図3参照)。
The present embodiment discloses the following features.
A first feature is a mechanical pencil unit in which a lead tank portion inserted through the rear end side of a holding cylinder advances and retracts to feed out a lead lead, in which the rear end of the holding cylinder protrudes radially inward. A first sliding contact portion is provided on the outer peripheral portion of the lead tank portion and is in sliding contact with the inner peripheral surface of the holding cylinder on the front side of the engaging portion. A concave portion is provided on the rear side of the sliding contact portion and is cylindrically recessed radially inward. It is formed to have a length longer than the forward/backward stroke (see FIGS. 1 to 3).

第2の特徴は、径方向のがたつきが生じた場合でも凹部底面の削れや摩耗等を防ぐために、前記凹部の深さを、前記係合部が前記保持筒内面から突出する量と略同等又は同等以上に設定した(図2参照)。 A second feature is that the depth of the recess is approximately equal to the amount by which the engaging portion protrudes from the inner surface of the holding cylinder, in order to prevent the bottom surface of the recess from being scraped or worn even if rattling occurs in the radial direction. It was set to equal or greater than equal (see Figure 2).

第3の特徴として、径方向のがたつきを効果的に防ぐために、前記保持筒内には、挟持した鉛芯を前方へ繰り出す鉛芯繰出し機構が設けられ、前記芯タンク部には、第1の摺接部よりも前側で前記鉛芯繰出し機構の後端側の外周面に環状に嵌め合わせられて前後へ摺接する第2の摺接部が設けられている(図1及び図2参照)。 As a third feature, in order to effectively prevent rattling in the radial direction, a lead core feeding mechanism for feeding forward the clamped lead core is provided in the holding cylinder. A second sliding contact portion is provided on the front side of the first sliding contact portion and is annularly fitted to the outer peripheral surface of the rear end side of the lead lead feeding mechanism so as to slide back and forth (see FIGS. 1 and 2). ).

第4の特徴として、前記鉛芯繰出し機構は、鉛芯を挟持するチャック部と、前記チャック部の後端側を支持する支持筒部とを備え、挟持した鉛芯に予め設定された筆圧よりも強い付勢力が加わった際に前記チャック部及び前記支持筒部を後退させるように構成され、前記芯タンク部の第2の摺接部は、前記支持筒部の外周面に設けられている(図1及び図2参照)。 As a fourth feature, the lead lead feeding mechanism includes a chuck portion that clamps the lead lead, and a support cylinder portion that supports the rear end side of the chuck portion. The second sliding contact portion of the lead tank portion is provided on the outer peripheral surface of the support cylinder portion. (see Figures 1 and 2).

第5の特徴として、戻り芯の損傷を防ぐために、前記支持筒部は、前記チャック部の後端側に接続されたチャック支持部材と、前記チャック部よりも後側で前記チャック支持部材の内周面に嵌合した芯タンク案内部材とを備え、前記芯タンク案内部材は、その内周面の前端側に、前方へ向かって拡径する面取り部を有する(図4参照)。
なお、この第5の特徴は、上記した第1~4の特徴を一部含まない独立した発明とすることが可能であり、この場合も戻り芯の損傷防止効果を有する。
As a fifth feature, in order to prevent damage to the return core, the support cylinder portion includes a chuck support member connected to the rear end side of the chuck portion, and an inner portion of the chuck support member behind the chuck portion. and a wick tank guide member fitted to the peripheral surface, and the wick tank guide member has a chamfered portion whose diameter increases forward on the front end side of the inner peripheral surface of the wick tank guide member (see FIG. 4).
It should be noted that this fifth feature can be an independent invention that does not partially include the above-described first to fourth features, and in this case also has the effect of preventing damage to the return lead.

第6の特徴は、上記シャープペンシルユニットを具備し出没式筆記具を構成した(図5参照)。 The sixth feature is that the mechanical pencil unit is provided to constitute a retractable writing instrument (see FIG. 5).

<具体的実施態様>
次に、上記特徴を有する具体的な実施態様について、図面に基づいて詳細に説明する。本明細書中、軸方向とは、保持筒10の中心線の延びる方向を意味する。また、「前」とは、前記軸方向の一方側であって鉛芯が繰り出される方向を意味する。また、「後」とは、前記一方側に対する逆方向側を意味する。
<Specific embodiment>
Next, specific embodiments having the above characteristics will be described in detail with reference to the drawings. In this specification, the axial direction means the direction in which the center line of the holding cylinder 10 extends. Further, "front" means one side in the axial direction and the direction in which the lead core is drawn out. Also, "rear" means the side opposite to the one side.

図1に示すシャープペンシルユニット1は、保持筒10と、保持筒10内に支持された鉛芯繰出し機構M1と、保持筒10の後端側に貫通状に挿通された芯タンク部60と、鉛芯xに加わる径方向の力成分によりホルダー20を鉛芯xに相対し前進させる運動方向変換機構M2とを具備している。 The mechanical pencil unit 1 shown in FIG. 1 includes a holding barrel 10, a lead lead feeding mechanism M1 supported in the holding barrel 10, a lead tank portion 60 penetrating through the rear end side of the holding barrel 10, and a motion direction changing mechanism M2 for advancing the holder 20 relative to the lead core x by a radial force component applied to the lead core x.

保持筒10は、図示例によれば、ホルダー20を前方へ突出させるようにして内在する第1の筒部11と、この第1の筒部11の後端側に同芯状に接続された第2の筒部12と、この第2の筒部12の後端側に同芯状に接続された第3の筒部13とから一体筒状に構成される。これら複数の筒部11,12,13は、その一部または全部を一体の部材とすることが可能である。 According to the illustrated example, the holding tube 10 is concentrically connected to the first tube portion 11, which is internal so that the holder 20 protrudes forward, and the rear end side of the first tube portion 11. The second tubular portion 12 and the third tubular portion 13 concentrically connected to the rear end side of the second tubular portion 12 are integrally tubular. A part or all of these cylindrical portions 11, 12, 13 can be integrated.

特に、第3の筒部13は、硬質な金属材料より長尺円筒状に形成され、その後端に、径方向内側へ突出する係合部13aを有する。この係合部13aは、図3に示すように、全周にわたる円環状に形成され、その内向きの突端縁を、後述する芯タンク部60の凹部61b内の空間に配置している。 In particular, the third cylindrical portion 13 is formed in a long cylindrical shape from a hard metal material, and has an engaging portion 13a protruding radially inward at its rear end. As shown in FIG. 3, the engaging portion 13a is formed in an annular shape over the entire circumference, and its inward protruding edge is disposed in a space inside a recessed portion 61b of the lead tank portion 60, which will be described later.

鉛芯繰出し機構M1は、保持筒10内に保持されて鉛芯xの外周面に弾性的に緩圧接される芯ブレーカ30と、芯ブレーカ30よりも後側で進退運動するチャック部40と、チャック部40に対し環状に嵌り合うクラッチリング41と、クラッチリング41をその後方側から受ける略筒状のクラッチ受け42と、チャック部40の後端側を支持する支持筒部43とを備える。
この鉛芯繰出し機構M1は、芯タンク部60から伝達される支持筒部43の進退動作に伴ってチャック部40に挟持した鉛芯xを繰り出す。また、この鉛芯繰出し機構M1は、チャック部40に挟持した鉛芯xに予め設定された筆圧よりも強い付勢力が加わった際に、鉛芯xと共にチャック部40及び支持筒部43等を後退させる。
The lead lead feeding mechanism M1 includes a lead breaker 30 that is held in the holding cylinder 10 and is elastically and loosely pressed against the outer peripheral surface of the lead core x, a chuck part 40 that advances and retreats behind the lead breaker 30, It includes a clutch ring 41 annularly fitted to the chuck portion 40 , a substantially cylindrical clutch receiver 42 that receives the clutch ring 41 from the rear side, and a support cylinder portion 43 that supports the rear end side of the chuck portion 40 .
The lead lead feeding mechanism M1 feeds out the lead core x held by the chuck part 40 in accordance with the advancing and retreating motion of the support cylinder part 43 transmitted from the lead tank part 60 . In addition, the lead feeding mechanism M1 moves the lead x, the chuck 40, the support cylinder 43, etc. together with the lead x when an urging force stronger than a preset writing pressure is applied to the lead x clamped by the chuck 40. retreat.

芯ブレーカ30は、エラストマー樹脂や合成ゴム等の弾性材料から略円筒状に形成され、その内周面を、鉛芯xの外周面に緩圧接する。 The core breaker 30 is formed in a substantially cylindrical shape from an elastic material such as elastomer resin or synthetic rubber, and its inner peripheral surface is in loose pressure contact with the outer peripheral surface of the lead core x.

チャック部40は、周方向に間隔を置いて配設された複数の長尺片をその後端側で一体に連結してなり、これら複数の長尺片を径内方向へ弾性的に撓ませた際に、これら長尺片の前端側の爪部により鉛芯xを挟持する。 The chuck portion 40 is formed by integrally connecting a plurality of long pieces arranged at intervals in the circumferential direction at the rear end side, and elastically deflecting the plurality of long pieces radially inward. At this time, the lead core x is held between the claws on the front end side of these elongated pieces.

クラッチリング41は、挟持状態のチャック部40に嵌り合い、チャック部40と共に前進した際に保持筒10内面の段部に当接してチャック部40から外れて、チャック部40の前端側を解放する。これらチャック部40及びクラッチリング41には、周知構造のものを用いることができる。 The clutch ring 41 is engaged with the clamped chuck portion 40, and when moved forward together with the chuck portion 40, the clutch ring 41 comes into contact with the stepped portion on the inner surface of the holding cylinder 10 and comes off the chuck portion 40, thereby releasing the front end side of the chuck portion 40. . As the chuck portion 40 and the clutch ring 41, those having known structures can be used.

クラッチ受け42は、保持筒10内で所定量進退するように設けられ、その中心側にチャック部40を遊挿しており、保持筒10内の段部に対し後方から当接している。 The clutch receiver 42 is provided so as to move back and forth within the holding cylinder 10 by a predetermined amount.

クラッチ受け42の内外及び後方には、第1の付勢部材51、第2の付勢部材52及び第3の付勢部材53が設けられる。 A first biasing member 51 , a second biasing member 52 and a third biasing member 53 are provided inside, outside and behind the clutch receiver 42 .

第1の付勢部材51は、芯タンク部60に相対し、クラッチ受け42を、予め設定された通常の筆圧よりも強い付勢力で前方へ付勢する。 The first biasing member 51 faces the lead tank portion 60 and biases the clutch receiver 42 forward with a biasing force stronger than a preset normal writing pressure.

第2の付勢部材52は、その付勢力が後述するホルダー付勢部材23よりも大きい圧縮コイルスプリングであり、その前端側を保持筒10に係止し、後端側をクラッチ受け42に係止して、これら部材間を弾発している。この第2の付勢部材52の付勢力は、芯ブレーカ30と鉛芯xとの間の摩擦等による進退方向の抵抗力よりも大きく設定されている。 The second biasing member 52 is a compression coil spring whose biasing force is greater than that of the holder biasing member 23, which will be described later. It stops and springs between these members. The biasing force of the second biasing member 52 is set to be greater than the resistance force in the advancing/retreating direction due to friction or the like between the core breaker 30 and the lead core x.

第3の付勢部材53は、前端側をクラッチ受け42に係止し、後端側を支持筒部43に係止した圧縮コイルスプリングであり、チャック部40を後方へ付勢している。 The third biasing member 53 is a compression coil spring whose front end side is locked to the clutch receiver 42 and whose rear end side is locked to the support cylinder portion 43, and biases the chuck portion 40 rearward.

支持筒部43は、チャック部40の後端側に接続されたチャック支持部材43aと、チャック部40の後端よりも後側でチャック支持部材43aの内周面に嵌合された芯タンク案内部材43bとを一体的に具備している。 The support cylinder portion 43 includes a chuck support member 43a connected to the rear end of the chuck portion 40, and a core tank guide fitted to the inner peripheral surface of the chuck support member 43a behind the rear end of the chuck portion 40. It is integrally provided with the member 43b.

チャック支持部材43aは、チャック部40の後端側に環状に嵌合するとともに、その前端部により第3の付勢部材53の後端を受けている。 The chuck support member 43a is annularly fitted to the rear end side of the chuck portion 40 and receives the rear end of the third biasing member 53 by its front end portion.

芯タンク案内部材43bは、チャック支持部材43aに挿入されて嵌合される嵌合筒部43b1と、この嵌合筒部43b1の後側で拡径してチャック支持部材43aの後端に当接する鍔部43b2と、鍔部43b2から後方へ突出したガイド筒部43b3とを一体に有する(図1及び図4参照) The lead tank guide member 43b has a cylindrical fitting portion 43b1 which is inserted into and fitted to the chuck supporting member 43a, and a rear side of the fitting cylindrical portion 43b1 which is enlarged in diameter to abut on the rear end of the chuck supporting member 43a. It integrally has a flange portion 43b2 and a guide tube portion 43b3 projecting rearward from the flange portion 43b2 (see FIGS. 1 and 4).

嵌合筒部43b1は、チャック部40の後端側の内径と同等の略円筒状に形成され、その内周面の前端内縁に、前方へ向かって拡径する面取り部43b11を有する。
この面取り部43b11は、芯タンク部60を前方へ押動しながら鉛芯xを後方へ押し戻す操作が行われた場合に、後方へスライドする鉛芯xに対する摩擦や引っ掛かり等を低減し、鉛芯xの損傷を防ぐ。
なお、面取り部43b11は、図4の例示によればC面取りとしているが、R面取りやその他の形状の傾斜面とすることが可能である。
The fitting cylinder portion 43b1 is formed in a substantially cylindrical shape having the same inner diameter as the rear end side of the chuck portion 40, and has a chamfered portion 43b11 that expands in diameter toward the front at the front inner edge of the inner peripheral surface.
The chamfered portion 43b11 reduces friction and catching on the lead core x sliding backward when the lead tank portion 60 is pushed forward and the lead core x is pushed backward. prevent damage to x.
Although the chamfered portion 43b11 is C-chamfered in the example of FIG. 4, it may be R-chamfered or an inclined surface of another shape.

ガイド筒部43b3は、後方へわたる円筒状に形成される。
このガイド筒部43b3は、芯タンク部60の前端側に挿入されて、芯タンク部60が進退した際に、芯タンク部60の前端側の内周面(第2の摺接部61c)に摺接する。
The guide tube portion 43b3 is formed in a cylindrical shape extending rearward.
This guide tube portion 43b3 is inserted into the front end side of the lead tank portion 60, and when the lead tank portion 60 advances and retreats, the guide tube portion 43b3 is attached to the inner peripheral surface (second sliding contact portion 61c) of the front end side of the lead tank portion 60. Sliding contact.

芯タンク部60は、前端部を開口した略筒状に構成され、鉛芯繰出し機構M1に対し後方側から鉛芯xを供給する。図示例の芯タンク部60は、保持筒10の後端側に進退可能に挿通された摺動筒部61と、この摺動筒部61に接続されて後方へ延設された円筒状のタンク本体部62とから構成される。
なお、この芯タンク部60は、図示例以外の他例としては、単数の筒状部材からなる構成とすることも可能である。
The lead tank part 60 has a substantially cylindrical shape with an open front end, and supplies the lead core x from the rear side to the lead lead feeding mechanism M1. The illustrated lead tank portion 60 includes a sliding cylinder portion 61 inserted into the rear end side of the holding cylinder 10 so as to be able to move forward and backward, and a cylindrical tank connected to the sliding cylinder portion 61 and extending rearward. It is composed of a body portion 62 .
It should be noted that the lead tank portion 60 can be configured by a single tubular member as another example other than the illustrated example.

摺動筒部61は、第3の筒部13の係合部13aに挿通されて前後方向へわたる略円筒状に形成される。
この摺動筒部61の外周部には、保持筒10の内周面に摺接する第1の摺接部61aと、第1の摺接部61aよりも後側で径方向内側へ円筒状に凹んだ凹部61bとが設けられる。
また、摺動筒部61の内周部の前端側には、第2の摺接部61cが設けられている。
The sliding tubular portion 61 is formed in a substantially cylindrical shape that is inserted into the engaging portion 13a of the third tubular portion 13 and extends in the front-rear direction.
A first sliding contact portion 61a that slides on the inner peripheral surface of the holding cylinder 10 and a cylindrical sliding portion 61a extending radially inward on the rear side of the first sliding contact portion 61a is formed on the outer peripheral portion of the sliding cylindrical portion 61. A concave recess 61b is provided.
A second sliding contact portion 61 c is provided on the front end side of the inner peripheral portion of the sliding cylinder portion 61 .

第1の摺接部61aは、保持筒10の係合部13aよりも前側で第3の筒部13の内周面に摺接する円筒状の面である。 The first sliding contact portion 61 a is a cylindrical surface that is in sliding contact with the inner peripheral surface of the third cylindrical portion 13 on the front side of the engaging portion 13 a of the holding cylinder 10 .

凹部61bは、第3の筒部13の係合部13aの突端よりも径方向内側に、円筒面状の底部を配置するとともに、その前後方向の長さが、芯タンク部60の進退ストロークに応じて適宜に設定されている。
詳細に説明すれば、ノック操作等により芯タンク部60を進退させると、図示の間隔wが狭まって、芯タンク部60の進退運動がチャック部40及び支持筒部43に伝達し、鉛芯繰出し機構M1から鉛芯xが繰出される。
これらの動作により芯タンク部60が進退する際の最大のストロークを含むように、凹部61bの前後方向の長さが設定されている。
また、凹部61bの深さは、係合部13aが径内方向へ突出する量に対し、略同等又は同等以上に設定される(図2参照)。
The concave portion 61 b has a cylindrical bottom portion arranged radially inwardly of the tip of the engaging portion 13 a of the third cylindrical portion 13 , and its length in the front-rear direction corresponds to the advancing/retreating stroke of the lead tank portion 60 . are set accordingly.
In more detail, when the lead tank portion 60 is moved back and forth by a knocking operation or the like, the gap w shown in the figure narrows, and the back and forth motion of the lead tank portion 60 is transmitted to the chuck portion 40 and the support cylinder portion 43, thereby feeding out the lead lead. A lead core x is delivered from the mechanism M1.
The length of the concave portion 61b in the front-rear direction is set so as to include the maximum stroke when the lead tank portion 60 advances and retreats by these operations.
The depth of the concave portion 61b is set to be substantially equal to or greater than the radially inward protruding amount of the engaging portion 13a (see FIG. 2).

第2の摺接部61cは、第1の摺接部61aよりも前側で、鉛芯繰出し機構M1の芯タンク案内部材43bの後端側外周面に対し、環状に嵌め合わせられている。
この第2の摺接部61cは、摺動筒部61の内周において、タンク本体部62前端よりも前側に確保された円筒状の面であり、芯タンク部60が進退する際に、芯タンク案内部材43bの外周面に摺接する。
The second sliding contact portion 61c is annularly fitted to the rear end side outer peripheral surface of the lead tank guide member 43b of the lead lead feeding mechanism M1 on the front side of the first sliding contact portion 61a.
The second sliding contact portion 61c is a cylindrical surface secured on the front side of the front end of the tank body portion 62 on the inner periphery of the sliding cylinder portion 61, and when the lead tank portion 60 advances and retreats, It slides on the outer peripheral surface of the tank guide member 43b.

また、摺動筒部61における凹部61bよりも後側には、凹部61bの底面に対し拡径した挿入筒部61dが設けられる。
この挿入筒部61dは、円筒状に形成され、その外周面が、凹部61bの底部外径よりも大きく、且つ係合部13aの内径よりも小さく設定される。
当該シャープペンシルユニット1の組立作業において、摺動筒部61は、前方側(図1の左方向側)から第3の筒部13内に挿入される。そして、挿入筒部61dが、前側から係合部13aに挿通される。
Further, an insertion cylinder portion 61d having a larger diameter than the bottom surface of the recess 61b is provided behind the recess 61b in the sliding cylinder portion 61. As shown in FIG.
The insertion tube portion 61d is formed in a cylindrical shape, and its outer peripheral surface is set larger than the bottom outer diameter of the recess 61b and smaller than the inner diameter of the engaging portion 13a.
In the assembly work of the mechanical pencil unit 1, the sliding cylinder part 61 is inserted into the third cylinder part 13 from the front side (the left direction side in FIG. 1). Then, the insertion tube portion 61d is inserted through the engaging portion 13a from the front side.

また、運動方向変換機構M2は、第1の筒部11、ホルダー20、及びホルダー付勢部材23等によって構成され、鉛芯xを介してホルダー20に加わる径方向の力成分により、鉛芯xに相対しホルダー20を前進させる。 Further, the motion direction conversion mechanism M2 is composed of the first cylindrical portion 11, the holder 20, the holder biasing member 23, and the like, and the force component in the radial direction applied to the holder 20 via the lead core x causes the lead core x to move. to move the holder 20 forward.

ホルダー20は、ホルダー本体部21と、ホルダー本体部21の後側に接続された受け部22とから一体的に構成され、保持筒10に対し進退可能に支持される。なお、他例としては、これら二つの部材を一体の部材とすることが可能である。 The holder 20 is integrally composed of a holder main body portion 21 and a receiving portion 22 connected to the rear side of the holder main body portion 21 and is supported so as to be able to move forward and backward relative to the holding cylinder 10 . Alternatively, these two members can be integrated.

ホルダー本体部21は、保持筒10内に挿通されるとともに保持筒10の前側開口部11aから前方へ突出する略円筒状の部材である。このホルダー本体部21の外周部には、前方へ向かって拡径して前側開口部11aに摺接する環状のカム斜面21aが設けられている。 The holder main body 21 is a substantially cylindrical member that is inserted into the holding cylinder 10 and protrudes forward from the front opening 11 a of the holding cylinder 10 . An annular cam slope 21a is provided on the outer peripheral portion of the holder main body 21 so as to increase in diameter toward the front and slidably contact the front opening 11a.

そして、上記構成のシャープペンシルユニット1は、図5に例示するように、多機能出没式筆記具Aに組み込まれる。
多機能出没式筆記具Aは、複数の駒a2,a3を選択的に前進させる操作により、前進した駒a2(又はa3)に接続されたリフィールの前端筆記部を、軸筒a1前端から前方へ突出させる。前記リフィールは、図示例によれば、シャープペンシルユニット1又はボールペンリフィール2である。
例えば、開閉機能付きクリップa6を有する駒a2が、コイルスプリングa4の付勢力に抗して前進操作され、この駒a2に接続されたシャープペンシルユニット1(リフィール)の前端筆記部が、軸筒a1の前端開口部から前方へ突出すると、駒a2が軸筒a1内に設けられる係止部a5に係止され、この突出状態が維持される。
この突出状態において、クリップa6を前進させる操作を行えば、シャープペンシルユニット1の前端から鉛芯xが繰り出される。
なお、この多機能出没式筆記具Aには、例えば特開2014-198439号公報に示される基本構造を適用することが可能である。
Then, the mechanical pencil unit 1 having the above configuration is incorporated into a multifunctional retractable writing instrument A, as illustrated in FIG.
In the multi-function retractable writing instrument A, by selectively advancing a plurality of pieces a2 and a3, the front end writing part of the refill connected to the advanced piece a2 (or a3) protrudes forward from the front end of the barrel a1. Let Said refill is, according to the illustrated example, a mechanical pencil unit 1 or a ballpoint pen refill 2 .
For example, a piece a2 having a clip a6 with an opening/closing function is operated to advance against the biasing force of a coil spring a4, and the front end writing portion of a mechanical pencil unit 1 (refill) connected to this piece a2 moves toward the shaft tube a1. When the piece a2 protrudes forward from the front end opening of the shaft tube a1, the piece a2 is locked by the locking portion a5 provided in the shaft tube a1, and this projecting state is maintained.
When the clip a6 is moved forward in this projected state, the lead x is drawn out from the front end of the mechanical pencil unit 1. As shown in FIG.
For this multifunctional retractable writing instrument A, for example, the basic structure shown in Japanese Patent Application Laid-Open No. 2014-198439 can be applied.

次に、上記構成のシャープペンシルユニット1及び多機能出没式筆記具Aについて、その特徴的な作用効果を詳細に説明する。
図5に示す突出状態において、クリップa6を指等で押してノック操作すると、間隔wが狭まり、芯タンク部60の前端が支持筒部43の後端に当接した状態で、チャック部40及び支持筒部43が進退運動する。そして、この進退運動により、芯ブレーカ30から前方へ鉛芯xが繰出される。
Next, the characteristic functions and effects of the mechanical pencil unit 1 and the multifunctional retractable writing instrument A configured as described above will be described in detail.
In the projecting state shown in FIG. 5, when the clip a6 is pushed and knocked with a finger or the like, the gap w is narrowed, and in a state where the front end of the lead tank portion 60 is in contact with the rear end of the support cylinder portion 43, the chuck portion 40 and the support cylinder portion 43 are separated. The tubular portion 43 moves back and forth. By this forward and backward motion, the lead core x is drawn forward from the core breaker 30 .

前記進退運動の際、第3の筒部13後端の係合部13aは、摺動筒部61の外周面の凹部61b底面との間に隙間を保持する(図2参照)。このため。摺動筒部61の外周面が、係合部13aによって削られるようなことを防ぐことができる。
しかも、前記進退運動の際、芯タンク部60は、第1の摺接部61aと第2の摺接部61cの前後二か所の摺接部分により、直線性の高い運動をする。このため、がたつきに起因する動作不良や、各接触部分の摩耗等を低減して、品質を向上することができる。
During the forward/backward movement, the engaging portion 13a at the rear end of the third cylindrical portion 13 maintains a gap between it and the bottom surface of the concave portion 61b on the outer peripheral surface of the sliding cylindrical portion 61 (see FIG. 2). For this reason. It is possible to prevent the outer peripheral surface of the sliding cylinder portion 61 from being scraped by the engaging portion 13a.
Moreover, during the advancing and retreating movement, the lead tank portion 60 moves with high linearity due to the two front and rear sliding contact portions of the first sliding contact portion 61a and the second sliding contact portion 61c. Therefore, it is possible to reduce malfunctions caused by rattling, wear of each contact portion, and the like, and improve quality.

また、第3の筒部13に対し摺動筒部61を接続する際は、前方側から摺動筒部61を挿入し、円筒状の挿入筒部61d及び凹部61bを、円環状の係合部13aに挿通すればよく、その組立作業性が良好である。 When connecting the sliding cylinder portion 61 to the third cylinder portion 13, the sliding cylinder portion 61 is inserted from the front side, and the cylindrical insertion cylinder portion 61d and the concave portion 61b are engaged with each other in an annular manner. It can be inserted through the portion 13a, and the assembling workability is good.

また、詳細な説明を省略するが、上記構成のシャープペンシルユニット1によれば、鉛芯xに過剰な径方向の力成分が加わった場合には、運動方向変換機構M2により鉛芯xに相対しホルダー20を前進させ鉛芯xを保護することができる。また、鉛芯xに過剰な後方への押圧力が加わった場合も、この鉛芯xを、チャック部40等と共に後退させて保護することができる。 Further, although detailed description is omitted, according to the mechanical pencil unit 1 having the above configuration, when an excessive force component in the radial direction is applied to the lead core x, the motion direction changing mechanism M2 moves the lead core x relative to the lead core x. Then, the holder 20 can be moved forward to protect the lead core x. Further, even when excessive backward pressure is applied to the lead core x, the lead core x can be retracted together with the chuck part 40 and the like to be protected.

<変形例>
なお、上記実施の形態によれば、特に好ましい一例として、運動方向変換機構M2を具備するシャープペンシルユニット1に対し、凹部61b等の構成を適用したが、他例としては、運動方向変換機構M2を省いた構成とすることも可能である。
<Modification>
According to the above-described embodiment, as a particularly preferable example, the configuration of the concave portion 61b and the like is applied to the mechanical pencil unit 1 having the movement direction conversion mechanism M2, but as another example, the movement direction conversion mechanism M2 can be omitted.

また、上記構成のシャープペンシルユニット1は、多機能出没式筆記具Aのシャープペンシル用リフィールとして構成したが、他例としては、シャープペンシルユニット1を軸筒内に備えて単機能のシャープペンシルを構成することも可能である。 Further, the mechanical pencil unit 1 having the above configuration is configured as a mechanical pencil refill for the multifunctional retractable writing instrument A, but as another example, the mechanical pencil unit 1 is provided in the barrel to configure a single-function mechanical pencil. It is also possible to

また、本発明は上述した実施態様に限定されず、本発明の要旨を変更しない範囲で適宜変更可能である。 Moreover, the present invention is not limited to the embodiments described above, and can be modified as appropriate without changing the gist of the present invention.

1:シャープペンシルユニット
10:保持筒
13a:係合部
20:ホルダー
40:チャック部
43:支持筒部
43a:チャック支持部材
43b:芯タンク案内部材
60:芯タンク部
61a:第1の摺接部
61b:凹部
61c:第2の摺接部
x:鉛芯
M1:鉛芯繰出し機構
M2:運動方向変換機構
1: Mechanical pencil unit 10: Holding cylinder 13a: Engagement part 20: Holder 40: Chuck part 43: Support cylinder part 43a: Chuck support member 43b: Lead tank guide member 60: Lead tank part 61a: First sliding contact part 61b: concave portion 61c: second sliding contact portion x: lead core M1: lead core feeding mechanism M2: motion direction changing mechanism

Claims (6)

保持筒の後端側に挿通された芯タンク部を進退させて鉛芯を繰出すようにしたシャープペンシルユニットにおいて、
前記保持筒の後端には、径方向内側へ突出する円環状の係合部が設けられ、
前記芯タンク部の外周部には、前記係合部よりも前側で前記保持筒の内周面に摺接する第1の摺接部と、前記第1の摺接部よりも後側で径方向内側へ円筒状に凹んだ凹部と、前記凹部よりも後側で前記凹部の底面に対し拡径された挿入筒部とが設けられ、前記凹部は、前記係合部の突端よりも径方向内側に底部を配置するとともに、前記芯タンク部が進退するストローク以上の長さに形成されていることを特徴とするシャープペンシルユニット。
In a mechanical pencil unit in which a lead tank portion inserted through the rear end side of a holding cylinder advances and retreats to extend a lead lead,
An annular engaging portion protruding radially inward is provided at the rear end of the holding cylinder,
The outer peripheral portion of the lead tank portion is provided with a first sliding contact portion that is in sliding contact with the inner peripheral surface of the holding cylinder on the front side of the engaging portion, and a radial direction on the rear side of the first sliding contact portion. A concave portion cylindrically recessed inward and an insertion tube portion having a diameter enlarged with respect to the bottom surface of the concave portion on the rear side of the concave portion are provided, and the concave portion is radially inward of the tip of the engaging portion. A mechanical pencil unit characterized in that the bottom portion is arranged in the container, and the lead tank portion is formed to have a length equal to or longer than the forward/backward stroke.
前記凹部の深さを、前記係合部が前記保持筒内面から突出する量と略同等又は同等以上に設定したことを特徴とする請求項1記載のシャープペンシルユニット。 2. The mechanical pencil unit according to claim 1, wherein the depth of said concave portion is set substantially equal to or more than the amount by which said engaging portion protrudes from the inner surface of said holding cylinder. 前記保持筒内には、挟持した鉛芯を前方へ繰り出す鉛芯繰出し機構が設けられ、
前記芯タンク部には、前記第1の摺接部よりも前側で前記鉛芯繰出し機構の後端側の外周面に環状に嵌め合わせられて前後へ摺接する第2の摺接部が設けられていることを特徴とする請求項1又は2記載のシャープペンシルユニット。
A lead core feeding mechanism for feeding forward the sandwiched lead core is provided in the holding cylinder,
The lead tank portion is provided with a second sliding contact portion that is annularly fitted to the outer peripheral surface of the lead lead feeding mechanism on the rear end side of the first sliding contact portion and that slides back and forth. 3. The mechanical pencil unit according to claim 1 or 2, wherein the mechanical pencil unit comprises:
前記鉛芯繰出し機構は、鉛芯を挟持するチャック部と、前記チャック部の後端側を支持する支持筒部とを備え、挟持した鉛芯に予め設定された筆圧よりも強い付勢力が加わった際に前記チャック部及び前記支持筒部を後退させるように構成され、
前記芯タンク部の前記第2の摺接部は、前記支持筒部の外周面に設けられていることを特徴とする請求項3記載のシャープペンシルユニット。
The lead lead feeding mechanism includes a chuck portion that clamps the lead lead, and a support cylinder portion that supports the rear end side of the chuck portion. configured to retract the chuck portion and the support cylinder portion when applied,
4. The mechanical pencil unit according to claim 3, wherein the second sliding contact portion of the lead tank portion is provided on the outer peripheral surface of the support cylinder portion.
前記支持筒部は、前記チャック部の後端側に接続されたチャック支持部材と、前記チャック部よりも後側で前記チャック支持部材の内周面に嵌合した芯タンク案内部材とを備え、
前記芯タンク案内部材は、その内周面の前端側に、前方へ向かって拡径する面取り部を有することを特徴とする請求項4記載のシャープペンシルユニット。
The support cylindrical portion includes a chuck support member connected to the rear end side of the chuck portion, and a core tank guide member fitted to the inner peripheral surface of the chuck support member on the rear side of the chuck portion,
5. The mechanical pencil unit according to claim 4, wherein the lead tank guide member has a chamfered portion on the front end side of the inner peripheral surface thereof, the diameter of which increases toward the front.
請求項1~5何れか1項記載のシャープペンシルユニットを具備した出没式筆記具。
A retractable writing instrument comprising the mechanical pencil unit according to any one of claims 1 to 5.
JP2018229114A 2018-12-06 2018-12-06 Mechanical pencil unit and retractable writing instrument Active JP7219600B2 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001010285A (en) 1999-06-28 2001-01-16 Pentel Corp Chucking body of mechanical pencil
JP2010076340A (en) 2008-09-29 2010-04-08 Pentel Corp Rotary projecting and retracting writing utensil
JP2017159579A (en) 2016-03-10 2017-09-14 ゼブラ株式会社 Mechanical pencil unit and retractable type writing instrument with mechanical pencil unit
WO2017154458A1 (en) 2016-03-10 2017-09-14 ゼブラ株式会社 Mechanical pencil unit and writing implement with said mechanical pencil unit

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5836556Y2 (en) * 1979-02-14 1983-08-17 ぺんてる株式会社 Shape pencil

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001010285A (en) 1999-06-28 2001-01-16 Pentel Corp Chucking body of mechanical pencil
JP2010076340A (en) 2008-09-29 2010-04-08 Pentel Corp Rotary projecting and retracting writing utensil
JP2017159579A (en) 2016-03-10 2017-09-14 ゼブラ株式会社 Mechanical pencil unit and retractable type writing instrument with mechanical pencil unit
WO2017154458A1 (en) 2016-03-10 2017-09-14 ゼブラ株式会社 Mechanical pencil unit and writing implement with said mechanical pencil unit

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