JP7241523B2 - Mechanical pencil unit, retractable writing instrument, and method for manufacturing mechanical pencil unit - Google Patents

Mechanical pencil unit, retractable writing instrument, and method for manufacturing mechanical pencil unit Download PDF

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JP7241523B2
JP7241523B2 JP2018230833A JP2018230833A JP7241523B2 JP 7241523 B2 JP7241523 B2 JP 7241523B2 JP 2018230833 A JP2018230833 A JP 2018230833A JP 2018230833 A JP2018230833 A JP 2018230833A JP 7241523 B2 JP7241523 B2 JP 7241523B2
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tubular member
mechanical pencil
pencil unit
lead
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JP2020093401A (en
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之博 月岡
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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、並びに該シャープペンシルユニットの製造方法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, or the like, a retractable writing instrument equipped with the mechanical pencil unit, and a method for manufacturing 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、第1~3の筒部を接続してなる保持筒と、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、チャック部に挟持した鉛芯を所定の操作により繰り出す遠心繰出し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。
Conventionally, in relation to this type of invention, for example, Patent Document 1 discloses a holding cylinder formed by connecting first to third cylinder parts, and a holding cylinder inserted through a front opening of the holding cylinder and extending forward from the front end of the holding cylinder. The holder is protruding toward the outside and supported so as to move back and forth with respect to the holding cylinder, a lead core feeding mechanism that forwards the lead core inserted into the holder, and the holder is held by the radial force applied from the lead core to the holder. A mechanical pencil unit is described which includes a movement direction changing mechanism for advancing the cylinder and the lead lead relative to each other, and a centrifugal delivery mechanism for delivering the lead lead clamped by the chuck portion by a predetermined operation. 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.

特開2017-159579号公報JP 2017-159579 A

ところで、従来技術では、前記した運動方向変換機構や鉛芯繰出し機構等の複雑な機構を構成するために、複数の筒状部材を前後に接続して構成する場合がある。例えば、前記シャープペンシルユニットでは、第2の筒部と第3の筒部の間を圧入により接続している。このような二つの筒状部材の圧入接続構造は、前記シャープペンシルユニットにおける他の部分にも適用可能である。
しかしながら、特にチャック部の基端側を支持する部材のように、鉛芯の外周面に近接又は摺接する比較的細身で薄肉な二つの筒状部材を、圧入により接続にした場合には、その圧入の際に外側になる筒状部材が周方向の引張力により破損してしまうおそれがある。
By the way, in the prior art, there are cases where a plurality of cylindrical members are connected back and forth in order to construct a complicated mechanism such as the motion direction changing mechanism or the lead lead feeding mechanism. For example, in the mechanical pencil unit, the second cylindrical portion and the third cylindrical portion are connected by press-fitting. Such a press-fit connection structure of two cylindrical members can be applied to other parts of the mechanical pencil unit.
However, when two relatively slim and thin cylindrical members that are in close proximity or sliding contact with the outer peripheral surface of the lead core, such as a member that supports the base end of the chuck portion, are connected by press-fitting, the There is a risk that the cylindrical member, which is on the outside during press-fitting, may be damaged by tensile force in the circumferential direction.

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。
所定の操作により鉛芯を繰り出すシャープペンシルユニットにおいて、鉛芯の外周面に対し環状に近接又は接触して前後に接続された第1の筒状部材と第2の筒状部材を備え、前記第1の筒状部材は、その内周面に周方向に間隔を置いた複数の係止突部を有し、前記第2の筒状部材は、前記第1の筒状部材よりも硬質の材料から形成され、前記第1の筒状部材に挿入され前記係止突部を乗り越えた位置に、乗り越え嵌合突起を有し、前記第1の筒状部材は、鉛芯を挟持するチャック部の基端側を支持する部材であり、前記第2の筒状部材は前記第1の筒状部材の後側に接続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.
A mechanical pencil unit that draws out a lead lead by a predetermined operation, comprising a first tubular member and a second tubular member that are annularly connected to or in contact with an outer peripheral surface of the lead lead, One tubular member has a plurality of locking protrusions spaced in the circumferential direction on its inner peripheral surface, and the second tubular member is made of a material harder than the first tubular member. and has a fitting protrusion at a position where it is inserted into the first cylindrical member and has passed over the locking protrusion , and the first cylindrical member is a chuck part that clamps a lead core. A mechanical pencil unit, which is a member for supporting a base end side, wherein the second tubular member is connected to the rear side of the first tubular member.

本発明は、以上説明したように構成されているので、鉛芯の外周面に近接又は摺接する比較的細身な筒状部材を二部品から構成する場合でも、変形や破損を効果的に防ぐことができる。 INDUSTRIAL APPLICABILITY Since the present invention is configured as described above, it is possible to effectively prevent deformation and breakage even when a relatively thin cylindrical member that is in close proximity or sliding contact with the outer peripheral surface of the lead core is constructed from two parts. can be done.

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. 第1の筒状部材の一例を示し、(a)は全断面図、(b)は後方側から視た図である。An example of the 1st cylindrical member is shown, (a) is a full sectional view, (b) is the figure seen from the back side. 第2の筒状部材の一例を示し、(a)は前方側から視た図、(b)は半断面図である。An example of a second cylindrical member is shown, (a) is a view seen from the front side, and (b) is a half cross-sectional view. 第1の筒状部材に対し第2の筒状部材を接続する状態を(a)~(c)に順次に示し、第1の筒状部材は全断面、第2の筒状部材は側面図である。(a) to (c) sequentially show states in which the second tubular member is connected to the first tubular member, the first tubular member being a full cross section, and the second tubular member being a side view. is. 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、所定の操作により鉛芯を繰り出すシャープペンシルユニットにおいて、鉛芯の外周面に対し環状に近接又は接触して前後に接続された第1の筒状部材と第2の筒状部材を備え、第1の筒状部材は、その内周面に周方向に間隔を置いた複数の係止突部を有し、第2の筒状部材は、第1の筒状部材よりも硬質の材料から形成され、第1の筒状部材に挿入され前記係止突部を乗り越えた位置に、乗り越え嵌合突起を有する(図1~図4参照)。
この構成によれば、乗り越え嵌合突起が複数の係止突部を乗り越える際に、部分的に各係止突部が変形するため、第1の筒状部材全体が拡径するように変形し破損してしまうことを防ぐことができる。
The present embodiment discloses the following features.
A first feature is a mechanical pencil unit that draws out a lead lead by a predetermined operation, in which a first tubular member and a second tubular member are connected back and forth in an annular proximity to or in contact with the outer peripheral surface of the lead lead. a first tubular member having a plurality of circumferentially spaced locking projections on an inner peripheral surface thereof; It is made of a hard material, and has a fitting protrusion that is inserted into the first cylindrical member and has a fitting protrusion that has passed over the locking protrusion (see FIGS. 1 to 4).
According to this configuration, when the overriding fitting projection rides over the plurality of locking projections, each locking projection is partially deformed, so that the entire first tubular member is deformed so as to expand in diameter. You can prevent it from getting damaged.

第2の特徴は、具体的な好ましい態様として、第1の筒状部材が合成樹脂材料から形成され、第2の筒状部材が金属材料から形成されている。 A second characteristic is that the first cylindrical member is made of a synthetic resin material and the second cylindrical member is made of a metal material as a specific preferred mode.

第3の特徴は、より真円度を高く維持するために、前記乗り越え嵌合突起が、環状に形成されている(図3参照)。 A third feature is that the overriding fitting projection is formed in an annular shape in order to maintain a higher degree of circularity (see FIG. 3).

第4の特徴は、特に組み立て作業時に真円度を高く維持するために、第1の筒状部材の内周面における前記係止突部よりも第2の筒状部材側に、前記複数の係止突部の突端内径よりも大きい内径の筒状ガイド面が設けられている(図2及び図4参照)。 A fourth feature is that, in order to maintain a high degree of circularity particularly during assembly work, the plurality of the plurality of tubular members are arranged closer to the second tubular member than the locking protrusions on the inner peripheral surface of the first tubular member. A cylindrical guide surface having an inner diameter larger than the tip inner diameter of the locking protrusion is provided (see FIGS. 2 and 4).

第5の特徴は、好ましい具体的態様として、第1の筒状部材が、鉛芯を挟持するチャック部の基端側を支持する部材であり、第2の筒状部材が第1の筒状部材の後側に接続されている(図1参照)。 A fifth characteristic is that, as a preferred specific mode, the first tubular member is a member that supports the base end side of the chuck portion that clamps the lead core, and the second tubular member is the first tubular member. It is connected to the rear side of the member (see Figure 1).

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

第7の特徴は、上記シャープペンシルユニットの製造方法であって、第1の筒状部材に対し第2の筒状部材を挿入して、前記係止突部に前記乗り越え嵌合突起を乗り越えさせる工程を含む(図4参照)。 A seventh feature is the manufacturing method of the mechanical pencil unit, wherein the second cylindrical member is inserted into the first cylindrical member, and the locking protrusion is caused to climb over the overriding fitting protrusion. (See FIG. 4).

<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、芯タンク部60を進退させる操作により鉛芯xを繰り出す。 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, A movement direction changing mechanism M2 is provided to advance 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.

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第1及び第2の筒状部材43,44とを備える。
この鉛芯繰出し機構M1は、芯タンク部60から伝達される進退運動により、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及び第1及び第2の筒状部材43,44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, 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 first and second cylindrical portions that support the rear end side of the chuck portion 40 . and members 43,44.
The lead lead feeding mechanism M1 feeds out the lead core x clamped by the chuck part 40 by forward and backward movement transmitted from the lead tank part 60. As shown in FIG. Further, the lead lead feeding mechanism M1 moves the lead x and the chuck part 40 together with the lead x and the first and second leads when an urging force stronger than a preset writing pressure is applied to the lead x clamped by the chuck part 40 . , the tubular members 43, 44, etc. are retracted.

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、後端側を第1の筒状部材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 urging member 53 is a compression coil spring whose front end is engaged with the clutch receiver 42 and whose rear end is engaged with the first tubular member 43, and urges the chuck portion 40 rearward. ing.

第1及び第2の筒状部材43,44は、鉛芯xの外周面に対し、その全周にわたって環状に近接又は接触して前後に接続されている。 The first and second cylindrical members 43 and 44 are connected to the outer peripheral surface of the lead core x in a ring-like manner or in contact therewith over the entire circumference.

第1の筒状部材43は、硬質合成樹脂材料から略円筒状に形成され、チャック部40の後端側に接続されてチャック部40を支持するとともに、前端面により第3の付勢部材53の後端部を受けている。
この第1の筒状部材43の内周面には、後端側(図示の右端側)から順番に、面取り部43a、筒状ガイド面43b、係止突起43c、被圧接面43dが設けられる(図2(a)参照)。
The first cylindrical member 43 is made of a hard synthetic resin material and has a substantially cylindrical shape. receiving the rear end of the
The inner peripheral surface of the first tubular member 43 is provided with a chamfered portion 43a, a tubular guide surface 43b, a locking projection 43c, and a pressure contact surface 43d in order from the rear end side (the right end side in the drawing). (See FIG. 2(a)).

面取り部43aは、第1の筒状部材43内周面の後端縁に形成され、第2の筒状部材44の挿入を容易にする。 The chamfered portion 43a is formed at the rear edge of the inner peripheral surface of the first tubular member 43 to facilitate the insertion of the second tubular member 44. As shown in FIG.

筒状ガイド面43bは、複数の係止突起43cの内径よりも大きい内径の円筒状に形成される。この筒状ガイド面43bは、挿入される第2の筒状部材44の前端側に摺接して、第2の筒状部材44の同心度を高く維持する。 The cylindrical guide surface 43b is formed in a cylindrical shape with an inner diameter larger than the inner diameter of the plurality of locking projections 43c. This cylindrical guide surface 43b is in sliding contact with the front end side of the second cylindrical member 44 to be inserted, and maintains the concentricity of the second cylindrical member 44 at a high level.

係止突起43cは、周方向に等間隔を置いて複数(図示例によれば四つ)設けられる。各係止突起43cは、前後方向へ連続するリブ状に形成される。
詳細に説明すれば、各係止突部43cは、図2(a)に示すように、その前端側と後端側が頂部へ向かって上り傾斜する傾斜面状に形成され、これら傾斜面の間に位置する頂部が、平坦面状に形成される。
A plurality of locking projections 43c (four in the illustrated example) are provided at regular intervals in the circumferential direction. Each locking projection 43c is formed in a rib shape that is continuous in the front-rear direction.
Specifically, as shown in FIG. 2(a), each locking protrusion 43c is formed in the shape of an inclined surface that slopes upward toward the top at its front end side and rear end side. is formed into a flat surface.

被圧接面43dは、第2の筒状部材44の乗り越え嵌合突起44a2によって圧接される円筒状の面であり、乗り越え嵌合突起44a2の外径よりも若干小さい内径に形成される。 The press-contacted surface 43d is a cylindrical surface that is press-contacted by the fitting protrusion 44a2 of the second cylindrical member 44, and is formed to have an inner diameter slightly smaller than the outer diameter of the fitting protrusion 44a2.

第2の筒状部材44は、第1の筒状部材43よりも硬質の材料(例えば、硬質金属材料)から形成され、第1の筒状部材43に対し後方側から挿入されて嵌合する嵌合筒部44aと、この嵌合筒部44aの後側で拡径して第1の筒状部材43の後端に当接する鍔部44bと、鍔部44bから後方へ突出したガイド筒部44cとを一体に有する(図1及び図3参照)。 The second tubular member 44 is made of a harder material (for example, a hard metal material) than the first tubular member 43, and is inserted into and fitted to the first tubular member 43 from the rear side. A fitting tubular portion 44a, a collar portion 44b that expands in diameter on the rear side of the fitting tubular portion 44a and contacts the rear end of the first tubular member 43, and a guide tubular portion that protrudes rearward from the flange portion 44b. 44c integrally (see FIGS. 1 and 3).

嵌合筒部44aは、前側円筒面部44a1と、前側円筒面部44a1の後側で径方向外側へ環状に突出する乗り越え嵌合突起44a2と、乗り越え嵌合突起44a2よりも後側の後側円筒面部44a3とから構成される。 The cylindrical fitting portion 44a includes a front cylindrical surface portion 44a1, a jumping fitting projection 44a2 annularly projecting radially outward on the rear side of the front cylindrical surface portion 44a1, and a rear cylindrical surface portion rearward of the riding fitting projection 44a2. 44a3.

前側円筒面部44a1は、円筒状に形成され、第1の筒状部材43を第2の筒状部材44に挿入する組立作業中に複数の係止突起43cに近接又は接触する(図4(b)参照 )。
この前側円筒面部44a1の外周面の前端縁には、前方へ向かって縮径する面取り部44a4が設けられる(図3参照)。また、前側円筒面部44a1の内周面の前端縁には、前方へ向かって拡径する面取り部44a5が設けられる。
The front cylindrical surface portion 44a1 is formed in a cylindrical shape, and comes close to or comes into contact with the plurality of locking projections 43c during the assembly work of inserting the first cylindrical member 43 into the second cylindrical member 44 (Fig. 4(b)). )reference ).
A chamfered portion 44a4 whose diameter decreases forward is provided at the front edge of the outer peripheral surface of the front cylindrical surface portion 44a1 (see FIG. 3). A chamfered portion 44a5 whose diameter increases forward is provided at the front end edge of the inner peripheral surface of the front cylindrical surface portion 44a1.

外周側の面取り部44a4は、第1の筒状部材43内への第2の筒状部材44の導入を容易にするためのものである。
内周側の面取り部44a5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て、鉛芯xの損傷を防ぐためのものである。
なお、これら面取り部44a4,44a5は、図3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 chamfered portion 44 a 4 on the outer peripheral side is for facilitating introduction of the second tubular member 44 into the first tubular member 43 .
The chamfered portion 44a5 on the inner peripheral side reduces friction, catching, etc., on the lead core x sliding backward when the lead core x is pushed backward while pushing the lead tank portion 60 forward. to prevent damage to the lead core x.
Although these chamfered portions 44a4 and 44a5 are C-chamfered in the example of FIG. 3, they may be R-chamfered or inclined surfaces of other shapes.

乗り越え嵌合突起44a2は、径方向外側へ突出する環状の突起であり、図示例によれば、前方へ向かう縮径傾斜面44a21と、この縮径傾斜面の後側に接続された円筒面44a22とから構成される。
この乗り越え嵌合突起44a2は、第1の筒状部材43の後端開口に第2の筒状部材44が挿入された際に、第1の筒状部材43内の係止突起43cを前方へ乗り越えるように、その前後位置が設定されている。
乗り越え嵌合突起44a2の外径は、第1の筒状部材43内の被圧接面43d内径よりも若干大きく設定される。
The overriding fitting projection 44a2 is an annular projection that protrudes radially outward. According to the illustrated example, the diameter-reduced inclined surface 44a21 directed forward and the cylindrical surface 44a22 connected to the rear side of the diameter-reduced inclined surface 44a21 are shown. Consists of
When the second tubular member 44 is inserted into the rear end opening of the first tubular member 43, the fitting projection 44a2 pushes the locking projection 43c inside the first tubular member 43 forward. The front and back positions are set so that it can be overcome.
The outer diameter of the fitting protrusion 44 a 2 is set slightly larger than the inner diameter of the pressure contact surface 43 d inside the first cylindrical member 43 .

また、後側円筒面部44a3は、第1の筒状部材43の係止突起43cよりも前後方向へ長い円筒状の面であり、複数の係止突起43cの突端に対し、近接又は接触する(図4(c)参照)。 The rear cylindrical surface portion 44a3 is a cylindrical surface that is longer in the front-rear direction than the locking projections 43c of the first cylindrical member 43, and comes close to or comes into contact with the tips of the plurality of locking projections 43c ( See FIG. 4(c)).

また、ガイド筒部44cは、後方へわたる円筒状に形成される。
このガイド筒部44c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の前端側の内周面に摺接する。
Further, the guide tube portion 44c is formed in a cylindrical shape extending rearward.
The guide tube portion 44c is inserted into the front end side of the lead tank portion 60, and comes into sliding contact with the inner peripheral surface of the lead tank portion 60 on the front end side when the lead tank portion 60 advances and retreats.

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.

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。この運動方向変換機構M2には、特許文献1のものを適用することが可能である。 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. It is possible to apply the mechanism disclosed in Patent Document 1 to this motion direction conversion mechanism M2.

次に、上記構成のシャープペンシルユニット1を製造上の特徴について、図4(a)~(c)に沿って説明する。
シャープペンシルユニット1の製造方法には、第1の筒状部材43に対し第2の筒状部材44を挿入して、第1の筒状部材43の複数の係止突起43cに対し、第2の筒状部材44の乗り越え嵌合突起44a2を乗り越えさせる工程を含む。
Next, manufacturing features of the mechanical pencil unit 1 having the above configuration will be described with reference to FIGS. 4(a) to 4(c).
In the manufacturing method of the mechanical pencil unit 1, the second tubular member 44 is inserted into the first tubular member 43, and the plurality of locking projections 43c of the first tubular member 43 are engaged with the second tubular member. includes a step of getting over the fitting protrusion 44a2 of the cylindrical member 44 of .

詳細に説明すれば、図4(a)~(b)に例示するように、第1の筒状部材43後端開口に対し、第2の筒状部材44を挿入する際、先ず、第2の筒状部材44の前側円筒面部44a1が、筒状ガイド面43bに案内されて前進し、複数の係止突起43c内へ進入する。
この前進の際、図4(b)に示すように、第2の筒状部材44における乗り越え嵌合突起44a2前側の縮径傾斜面44a21が、第1の筒状部材43の筒状ガイド面43bに圧接されて摺動することで、第1の筒状部材43に対する第2の筒状部材44の中心位置が矯正される。
Specifically, as illustrated in FIGS. 4A and 4B, when inserting the second tubular member 44 into the rear end opening of the first tubular member 43, the second tubular member 44 is first The front side cylindrical surface portion 44a1 of the tubular member 44 advances while being guided by the tubular guide surface 43b, and enters the plurality of locking projections 43c.
During this forward movement, as shown in FIG. 4(b), the reduced-diameter sloped surface 44a21 on the front side of the fitting projection 44a2 of the second tubular member 44 is aligned with the tubular guide surface 43b of the first tubular member 43. As shown in FIG. The center position of the second tubular member 44 with respect to the first tubular member 43 is corrected by pressing against and sliding against.

さらに、第1の筒状部材43に対し第2の筒状部材44を前進させると、乗り越え嵌合突起44a2が、係止突起43cに圧接されながら前進する。
この前進の際、第1の筒状部材43は、第2の筒状部材44よりも軟質な材料から形成されるため、係止突起43cを部分的に変形させる。このため、第1の筒状部材43全体の周方向の変形は抑制される。
そして、乗り越え嵌合突起44a2は、係止突起43cを前方へ乗り越えて、第1の筒状部材43における被圧接面43dに圧接される。このため、第1の筒状部材43に対する第2の筒状部材44の同心度が高く維持される。
Further, when the second tubular member 44 is advanced with respect to the first tubular member 43, the overriding fitting projection 44a2 advances while being pressed against the locking projection 43c.
During this forward movement, the first tubular member 43 is made of a softer material than the second tubular member 44, and thus partially deforms the locking projection 43c. Therefore, deformation of the entire first cylindrical member 43 in the circumferential direction is suppressed.
Then, the climbing fitting projection 44 a 2 climbs forward over the locking projection 43 c and is pressed against the pressed surface 43 d of the first cylindrical member 43 . Therefore, the concentricity of the second tubular member 44 with respect to the first tubular member 43 is kept high.

よって、上記構成のシャープペンシルユニット1及びその製造方法によれば、細身な第1の筒状部材43と第2の筒状部材44を嵌合接続する際に、第1の筒状部材43が周方向へ伸ばされて破損してしまうのを防ぐことができ、しかも、同心度の高い高精度な接続構造を得ることができる。 Therefore, according to the mechanical pencil unit 1 configured as described above and the method for manufacturing the same, when fitting and connecting the thin first cylindrical member 43 and the second cylindrical member 44, the first cylindrical member 43 is It is possible to prevent damage due to being stretched in the circumferential direction, and obtain a highly concentric and highly accurate connection structure.

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.

<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、係止突起43cを前後方向へ延びるリブ状に形成したが、この係止突起43cは、第1の筒状部材43の周方向に分割されたものであればよく、他例としては、部分的な平面視円形状や平面視楕円形状等の突起とすることが可能である。
<Modification>
According to the above-described embodiment, as a particularly preferable example, the locking projection 43c is formed in the shape of a rib extending in the front-rear direction. As another example, it is possible to use a projection that is partially circular or elliptical in plan view.

また、上記シャープペンシルユニット1では、本実施の形態の特徴的な接続構造を、チャック部40の後側を支持する第1の筒状部材43と第2の筒状部材44の接続箇所に適用したが、この接続構造は、図示例以外のシャープペンシルユニットにおいても、鉛芯xの外周面に近接又は接触する二つの筒状部材の接続構造として、適用することが可能である。 Further, in the mechanical pencil unit 1, the characteristic connection structure of the present embodiment is applied to the connecting portion between the first tubular member 43 and the second tubular member 44 that support the rear side of the chuck portion 40. However, this connection structure can also be applied to a mechanical pencil unit other than the illustrated example as a connection structure for connecting two cylindrical members that are close to or in contact with the outer peripheral surface of the lead core x.

また、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、第1の筒状部材43及び第2の筒状部材44の接続構造を適用したが、他例としては、運動方向変換機構M2を具備しないシャープペンシルユニットを構成することも可能である。 Further, according to the above-described embodiment, as a particularly preferable example, the connecting structure of the first tubular member 43 and the second tubular member 44 is applied to the mechanical pencil unit 1 having the motion direction changing mechanism M2. However, as another example, it is also possible to construct a mechanical pencil unit that does not include the motion direction changing mechanism M2.

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
20:ホルダー
40:チャック部
43:第1の筒状部材
43a:面取り部
43b:筒状ガイド面
43c:係止突起
43d:被圧接面
44:第2の筒状部材
44a:嵌合筒部
44a1:面取り部
44a2:乗り越え嵌合突起
44a21:縮径傾斜面
44a3:後側円筒面部
60:芯タンク部
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 20: Holder 40: Chuck Part 43: First Cylindrical Member 43a: Chamfered Part 43b: Cylindrical Guide Surface 43c: Locking Protrusion 43d: Pressure Contact Surface 44: Second Cylinder Shaped member 44a: Fitting cylindrical portion 44a1: Chamfered portion 44a2: Riding fitting projection 44a21: Diameter-reduced inclined surface 44a3: Rear cylindrical surface portion 60: Core tank portion x: Lead core M1: Lead core feeding mechanism M2: Movement direction change mechanism

Claims (6)

所定の操作により鉛芯を繰り出すシャープペンシルユニットにおいて、
鉛芯の外周面に対し環状に近接又は接触して前後に接続された第1の筒状部材と第2の筒状部材を備え、
前記第1の筒状部材は、その内周面に周方向に間隔を置いた複数の係止突部を有し、
前記第2の筒状部材は、前記第1の筒状部材よりも硬質の材料から形成され、前記第1の筒状部材に挿入され前記係止突部を乗り越えた位置に、乗り越え嵌合突起を有し、
前記第1の筒状部材は、鉛芯を挟持するチャック部の基端側を支持する部材であり、前記第2の筒状部材は前記第1の筒状部材の後側に接続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 that feeds out a lead lead by a predetermined operation,
Equipped with a first tubular member and a second tubular member connected back and forth in close proximity to or in contact with the outer peripheral surface of the lead core,
the first cylindrical member has a plurality of locking protrusions circumferentially spaced on its inner peripheral surface;
The second tubular member is formed of a material harder than the first tubular member, and is inserted into the first tubular member and has a fitting protrusion at a position where it has overcome the locking protrusion. has
The first tubular member is a member that supports the base end side of the chuck portion that clamps the lead core, and the second tubular member is connected to the rear side of the first tubular member. A mechanical pencil unit characterized by
前記第1の筒状部材が合成樹脂材料から形成され、前記第2の筒状部材が金属材料から形成されている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 said first tubular member is made of a synthetic resin material, and said second tubular member is made of a metal material. 前記乗り越え嵌合突起が、環状に形成さ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。 3. The mechanical pencil unit according to claim 1, wherein said fitting protrusion is formed in an annular shape. 前記第1の筒状部材の内周面における前記係止突部よりも前記第2の筒状部材側に、前記複数の係止突部の突端内径よりも大きい内径の筒状ガイド面が設けられていることを特徴とする請求項1~3何れか1項記載のシャープペンシルユニット。 A cylindrical guide surface having an inner diameter larger than the tip inner diameters of the plurality of locking protrusions is provided on the inner peripheral surface of the first cylindrical member closer to the second cylindrical member than the locking protrusions . The mechanical pencil unit according to any one of claims 1 to 3, characterized in that the mechanical pencil unit is 請求項1~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 4 . 請求項1~何れか1項記載のシャープペンシルユニットの製造方法であって、前記第1の筒状部材に対し前記第2の筒状部材を挿入して、前記係止突部に前記乗り越え嵌合突起を乗り越えさせる工程を含むことを特徴とするシャープペンシルユニットの製造方法。
The method of manufacturing a mechanical pencil unit according to any one of claims 1 to 4 , wherein the second tubular member is inserted into the first tubular member to get over the locking protrusion. A method of manufacturing a mechanical pencil unit, comprising a step of getting over the fitting projection.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009208424A (en) 2008-03-06 2009-09-17 Pilot Corporation Retractable mechanical pencil
JP2013252673A (en) 2012-06-08 2013-12-19 Pilot Corporation Coupling structure of writing instrument member
JP2015042449A (en) 2013-08-26 2015-03-05 有限会社中山金属工業 Mechanical pencil inner core and method for manufacturing the same
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009208424A (en) 2008-03-06 2009-09-17 Pilot Corporation Retractable mechanical pencil
JP2013252673A (en) 2012-06-08 2013-12-19 Pilot Corporation Coupling structure of writing instrument member
JP2015042449A (en) 2013-08-26 2015-03-05 有限会社中山金属工業 Mechanical pencil inner core and method for manufacturing the same
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

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