JP2020110928A

JP2020110928A - Mechanical pencil unit and retractable writing instrument

Info

Publication number: JP2020110928A
Application number: JP2019001106A
Authority: JP
Inventors: 之博月岡; Yukihiro Tsukioka
Original assignee: Zebra Pen Corp
Current assignee: Zebra Pen Corp
Priority date: 2019-01-08
Filing date: 2019-01-08
Publication date: 2020-07-27

Abstract

To prevent a lead core inserted in a holder from being damaged by impact etc.SOLUTION: A writing instrument comprises: a holding cylinder 10; a movement direction conversion mechanism M2 for moving a holder 20 forward relative to the holding cylinder 10 by a radial force component applied to the holder 20 protruding from a front end opening of the holding cylinder 10; and a lead core feeding mechanism M1 for feeding a sandwiched lead core x and inserting it into the holder 20 from the rear side. A buffer member 14 made of an elastic material is provided on an outer peripheral portion of the holding cylinder 10.SELECTED DRAWING: Figure 2

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 mechanical pencil refill, a mechanical pencil, and the like, 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すれば、容易に出没式筆記具を構成することができる。
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可能である。 Conventionally, in relation to this type of invention, for example, in Patent Document 1, a holding cylinder and a front opening of the holding cylinder are inserted to project forward from the front end of the holding cylinder and to be able to move forward and backward with respect to the holding cylinder. A supported holder, a lead core feeding mechanism that feeds the lead core inserted into the holder forward, and a movement direction change that advances this holder relative to the holding cylinder and the lead core by the radial force applied to the holder from the lead core. And a mechanical pencil unit with a mechanism. If the mechanical pencil unit is housed in the barrel, the retractable writing instrument can be easily constructed.
According to this retractable writing instrument, the mechanical pencil unit is moved forward by a predetermined operation, and when the holder at the front end of the mechanical pencil unit is projected from the opening at the front end of the barrel, the pencil core is projected radially from the holder. When the force is applied, the holder moves forward relative to the holding cylinder and the lead core, so that the holder can cover and protect the lead core.
Further, if the rear end side core tank portion is moved back and forth relative to the holding cylinder by a predetermined operation, the lead core feeding mechanism can be operated to feed the lead core.

特開２０１７−１５９５７９号公報JP, 2017-159579, A

しかしながら、前記従来のシャープペンシルユニットを具備して、例えば多機能の出没式筆記具を構成した場合、シャープペンシルユニットの外周部が、軸筒内周面や隣接するボールペンリフィール等に当接して、各種不具合の原因になる可能性がある。
特に、前記運動方向変換機構を具備した前記シャープペンシルユニットでは、ホルダーが進退及び傾斜可能に支持されているため、前記衝撃により、ホルダーに挿通されている鉛芯が損傷してしまうおそれがある。 However, when the conventional mechanical pencil unit is provided and, for example, a multifunctional retractable writing instrument is configured, the outer peripheral portion of the mechanical pencil unit comes into contact with the inner peripheral surface of the shaft cylinder, the adjacent ballpoint pen refill, and the like. It may cause a malfunction.
In particular, in the mechanical pencil unit including the movement direction converting mechanism, the holder is supported so as to be able to move forward and backward and tilt, so that the lead core inserted in the holder may be damaged by the impact.

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。
保持筒と、前記保持筒の前端開口部から突出して鉛芯を挿通するホルダーと、前記ホルダーに加わる径方向の力成分により前記保持筒に相対し前記ホルダーを前進させる運動方向変換機構と、挟持した鉛芯を繰出して前記ホルダーに後側から挿通する鉛芯繰出し機構とを具備し、前記保持筒の外周部に弾性材料からなる緩衝部材が設けら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 a problem, the present invention has the following configurations.
A holding tube, a holder that projects from the front end opening of the holding tube and inserts a lead core, a movement direction conversion mechanism that advances the holder relative to the holding tube by a radial force component applied to the holder, and a holding member. And a lead core feeding mechanism for feeding the lead core into the holder from the rear side, and a buffer member made of an elastic material is provided on an outer peripheral portion of the holding cylinder.

本発明は、以上説明したように構成されているので、周囲の部材に当接する際の衝撃により、ホルダーに挿通されている鉛芯が損傷するのを防ぐことができる。 Since the present invention is configured as described above, it is possible to prevent the lead core inserted in the holder from being damaged by the impact when abutting against the surrounding members.

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。It is sectional drawing which shows an example of the mechanical pencil unit which concerns on this invention. 同シャープペンシルユニットについて要部を拡大して示す半断面図である。It is a half cross-sectional view which expands and shows a principal part about the same mechanical pencil unit. 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 figure showing an example of a writing instrument provided with the same mechanical pencil unit. 本発明に係るシャープペンシルユニットの他例を示す要部拡大半断面図である。It is a principal part expanded half cross-sectional view which shows the other example of the mechanical pencil unit which concerns on this invention. 本発明に係るシャープペンシルユニットの他例を示す要部拡大半断面図である。It is a principal part expanded half cross-sectional view which shows the other example of the mechanical pencil unit which concerns on this invention.

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、保持筒と、前記保持筒の前端開口部から突出して鉛芯を挿通するホルダーと、前記ホルダーに加わる径方向の力成分により前記保持筒に相対し前記ホルダーを前進させる運動方向変換機構と、挟持した鉛芯を繰出して前記ホルダーに後側から挿通する鉛芯繰出し機構とを具備し、前記保持筒の外周部に弾性材料からなる緩衝部材が設けられている（図１〜図５参照）。 The following features are disclosed in the present embodiment.
A first feature is that a holding cylinder, a holder projecting from a front end opening of the holding cylinder to insert a lead core therein, and a movement for advancing the holder relative to the holding cylinder by a radial force component applied to the holder. It is provided with a direction changing mechanism and a lead core feeding mechanism for feeding the sandwiched lead core and inserting it into the holder from the rear side, and a buffer member made of an elastic material is provided on the outer peripheral portion of the holding cylinder (FIG. 1). ~ See Figure 5).

第２の特徴として、緩衝部材の外れや位置ずれを防ぐために、前記保持筒は、複数の筒状部材を前後に接続して構成され、前記緩衝部材は、前後に隣接する前記筒状部材の間に設けられ、その外周部を前記前後の筒状部材よりも径方向外側へ突出させている（図２及び図５参照）。 As a second feature, in order to prevent disengagement and displacement of the cushioning member, the holding cylinder is configured by connecting a plurality of cylindrical members in the front-rear direction, and the cushioning member is formed of the cylindrical members adjacent in the front-rear direction. The outer peripheral portion is provided between the front and rear cylindrical members and projects radially outward (see FIGS. 2 and 5).

第３の特徴として、緩衝部材の弾性を効果的に得るために、前記保持筒は、前後方向へ延設された円筒状の小径部と、前記小径部と同芯状に並ぶ円筒状の大径部とを有し、前記緩衝部材は、その外周部を前記大径部よりも径方向の外側へ突出させている（図２、図４及び図５参照）。 As a third feature, in order to effectively obtain the elasticity of the cushioning member, the holding cylinder has a cylindrical small diameter portion extending in the front-rear direction and a cylindrical large diameter arranged concentrically with the small diameter portion. The shock-absorbing member has an outer peripheral portion that projects outward in the radial direction from the large-diameter portion (see FIGS. 2, 4, and 5).

第４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３参照）。 A fourth feature is that the retractable writing instrument is configured by including the mechanical pencil unit (see FIG. 3).

＜第１の実施態様＞
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。 <First embodiment>
Next, specific embodiments having the above characteristics will be described in detail with reference to the drawings. In the present specification, the axial direction means the direction in which the center line of the holding cylinder 10 extends. The term "front" means one side of the axial direction in which the lead core is fed. In addition, “rear” means a 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の前端開口部から突出して鉛芯ｘを挿通するホルダー２０と、ホルダー２０に加わる径方向の力成分により保持筒１０に相対しホルダー２０を前進させる運動方向変換機構Ｍ２と、挟持した鉛芯ｘを繰出してホルダー２０に後側から挿通する鉛芯繰出し機構Ｍ１と、保持筒１０の後端側に接続された芯タンク部６０とを具備し、保持筒１０の外周部における緩衝部材１４によって周囲の部材に当接した際の衝撃を緩和するようにしている。 The mechanical pencil unit 1 shown in FIG. The movement direction changing mechanism M2 for moving the holder 20 forward, the lead core feeding mechanism M1 for feeding the sandwiched lead core x and inserting the lead core x into the holder 20 from the rear side, and the lead tank portion connected to the rear end side of the holding cylinder 10. 60, the shock absorbing member 14 on the outer peripheral portion of the holding cylinder 10 absorbs an impact when it abuts a peripheral member.

保持筒１０は、運動方向変換機構Ｍ２を構成する第１の筒部１１と、この第１の筒部１１の後端側に接続されて鉛芯繰出し機構Ｍ１を構成する第２の筒部１２及び第３の筒部１３とを具備し、一体的に構成される。 The holding cylinder 10 includes a first cylinder portion 11 that constitutes the movement direction conversion mechanism M2, and a second cylinder portion 12 that is connected to the rear end side of the first cylinder portion 11 and constitutes the lead core feeding mechanism M1. And the third tubular portion 13, and are integrally configured.

第１の筒部１１は、金属等の硬質材料によって略円筒状に形成され、その前部側に、ホルダー２０及びホルダー付勢部材２３を内在している。 The first tubular portion 11 is formed of a hard material such as metal into a substantially cylindrical shape, and the holder 20 and the holder urging member 23 are provided inside the front portion thereof.

第２の筒部１２は、金属等の硬質材料によって略段付き円筒状に形成される。
この第２の筒部１２は、第１の筒部１１内周面の後端側に圧入又は螺合される円筒状の前側接続部１２ａと、この前側接続部１２ａの後側にて環状の段部１２ｂを境に拡径した円筒状の中間部１２ｃと、この中間部１２ｃの後側で後方へ向かって徐々に拡径した環状傾斜面部１２ｄと、この環状傾斜面部１２ｄの後側にて環状の段部１２ｅを境に縮径した後側接続部１２ｆとを有する。 The second tubular portion 12 is formed of a hard material such as metal into a substantially stepped cylindrical shape.
The second tubular portion 12 has a cylindrical front connecting portion 12a that is press-fitted or screwed into the rear end side of the inner peripheral surface of the first tubular portion 11, and an annular shape on the rear side of the front connecting portion 12a. A cylindrical intermediate portion 12c whose diameter is expanded at the step 12b, an annular inclined surface portion 12d whose diameter is gradually increased rearward at the rear side of the intermediate portion 12c, and a rear side of the annular inclined surface portion 12d. It has a rear side connecting portion 12f whose diameter is reduced with an annular step portion 12e as a boundary.

第３の筒部１３は、金属等の硬質材料によって長尺な略円筒状に形成される。
この第３の筒部１３は、第２の筒部１２の段部１２ｅから後方へ離れて、後側接続部１２ｆの外周部に環状に装着され固定されている。この固定手段は、例えば、螺合や嵌合等とすればよい。
この構成によれば、第２の筒部１２の段部１２ｅの後側に、全周にわたる環状凹部１２ｇが形成される。 The third tubular portion 13 is formed of a hard material such as metal into a long, substantially cylindrical shape.
The third tubular portion 13 is annularly mounted and fixed to the outer peripheral portion of the rear connecting portion 12f, away from the step portion 12e of the second tubular portion 12 rearward. This fixing means may be, for example, screwing or fitting.
According to this configuration, the annular recess 12g is formed over the entire circumference on the rear side of the step 12e of the second tubular portion 12.

環状凹部１２ｇは、第２の筒部１２の段部１２ｅと、第３の筒部１３の前端部と、後側接続部１２ｆ前端側の縮径された外周面とによって全周にわたる凹溝状に構成される。そして、この環状凹部１２ｇには、緩衝部材１４が環状に嵌め合わせられる。
この環状凹部１２ｇの前後位置は、シャープペンシルユニット１が多機能出没式筆記具Ａ（図３参照）に組み込まれて進退する際に、緩衝部材１４が、他のリフィールや軸筒内周面との当接箇所に位置するように、適宜に設定される。 The annular recess 12g has a groove shape extending over the entire circumference by the step portion 12e of the second tubular portion 12, the front end portion of the third tubular portion 13, and the reduced outer peripheral surface on the front end side of the rear connecting portion 12f. Is composed of. Then, the buffer member 14 is annularly fitted into the annular recess 12g.
The front and rear positions of the annular recessed portion 12g are different from those of the other refills and the inner peripheral surface of the barrel when the mechanical pencil unit 1 is incorporated into the multifunctional retractable writing instrument A (see FIG. 3) and moves back and forth. It is appropriately set so as to be located at the contact point.

緩衝部材１４は、ゴムやエラストマー樹脂等の弾性材料から形成された無端輪状の部材であり、例えば、ゴム製のＯリングが用いられる。
緩衝部材１４は、保持筒１０の最大径部分（図示例によれば第３の筒部１３の外径部）よりも径方向の外側へ突出するように、その外径が設定されている。
この緩衝部材１４は、環状凹部１２ｇに嵌め合わせられるとともに、前側の第２の筒部１２と、後側の第３の筒部１３との間に挟まれるようにして固定される。 The cushioning member 14 is an endless ring-shaped member formed of an elastic material such as rubber or elastomer resin, and for example, a rubber O-ring is used.
The outer diameter of the cushioning member 14 is set so as to project outward in the radial direction from the maximum diameter portion of the holding cylinder 10 (the outer diameter portion of the third cylinder portion 13 in the illustrated example).
The cushioning member 14 is fitted into the annular recess 12g, and is fixed so as to be sandwiched between the front-side second cylindrical portion 12 and the rear-side third cylindrical portion 13.

ホルダー２０は、カム斜面２１ａを有するホルダー本体部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内で進退可能に支持される。なお、他例としては、ホルダー本体部２１と受け部２２を一体の部材とすることが可能である。 The holder 20 is integrally configured of a holder main body 21 having a cam slope 21a and a receiving portion 22 connected to the rear side of the holder main body 21, and is supported in the holding cylinder 10 so as to be movable back and forth. In addition, as another example, the holder main body 21 and the receiving portion 22 can be formed as an integral member.

運動方向変換機構Ｍ２は、第１の筒部１１の前端開口部、ホルダー２０のカム斜面２１ａ、ホルダー２０を後方へ付勢するホルダー付勢部材２３等によって構成される。この運動方向変換機構Ｍ２は、挿通される鉛芯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及び保持筒１０等に相対しホルダー２０を前進させ、前記径方向の力成分が除去された際に、ホルダー２０をホルダー付勢部材２３の付勢力によって後退させる。 The movement direction conversion mechanism M2 includes a front end opening of the first tubular portion 11, a cam slope 21a of the holder 20, a holder biasing member 23 that biases the holder 20 rearward, and the like. The movement direction conversion mechanism M2 advances the holder 20 relative to the lead core x and the holding cylinder 10 and the like by a radial force component applied to the holder 20 via the lead core x that is inserted, and the radial force is applied. When the components are removed, the holder 20 is retracted by the urging force of the holder urging member 23.

また、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よりも後側で鉛芯ｘを挟持して進退可能なチャック部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、支持筒部４３の後側に接続され芯タンク部６０の進退を案内するガイド筒部４４と、第１〜第３の付勢部材５１〜５３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、支持筒部４３及びガイド筒部４４等を後退させる。 Further, the lead core feeding mechanism M1 holds the lead core x between the core breaker 30 held in the holding cylinder 10 and elastically pressure-welded to the outer peripheral surface of the lead core x, and behind the core breaker 30. The chuck portion 40 that can move forward and backward, the clutch ring 41 that fits in the annular shape with the chuck portion 40, the clutch receiver 42 that receives the clutch ring 41 from the rear side thereof, and the support tubular portion that supports the rear end side of the chuck portion 40. 43, a guide cylinder portion 44 connected to the rear side of the support cylinder portion 43 for guiding the advance/retreat of the lead tank portion 60, and first to third biasing members 51 to 53.
The lead core feeding mechanism M1 feeds the lead core x sandwiched by the chuck portion 40 by the forward/backward movement transmitted from the lead tank portion 60. Further, the lead core feeding mechanism M1 includes the chuck portion 40, the support tube portion 43, and the chuck portion 40 together with the lead core x when a biasing force stronger than a preset writing pressure is applied to the lead core x sandwiched between the chuck portions 40. The guide cylinder portion 44 and the like are retracted.

なお、鉛芯繰出し機構Ｍ１及び運動方向変換機構Ｍ２の基本構造には、特許文献１のものを適用することが可能である。 The basic structure of the lead wire feeding mechanism M1 and the movement direction converting mechanism M2 may be the one of Patent Document 1.

また、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の後端側内周面に係合して所定量進退する摺動筒部６１と、この摺動筒部６１に接続されて後方へ長尺状に延設された円筒状のタンク本体部６２との二つの筒状部材から構成される。この芯タンク部６０の他例としては、単数又は三以上の筒状部材から構成することも可能である。 Further, the lead tank portion 60 is configured in a substantially cylindrical shape with an open front end portion, and supplies the lead core x from the rear side to the lead core feeding mechanism M1. The lead tank portion 60 in the illustrated example is a sliding cylinder portion 61 that engages with the inner peripheral surface of the rear end side of the holding cylinder 10 and advances and retreats by a predetermined amount, and is connected to the sliding cylinder portion 61 and is elongated rearward. It is composed of two cylindrical members including a cylindrical tank main body portion 62 extended to the inside. As another example of the lead tank portion 60, it is possible to form the lead tank portion from a single member or three or more tubular members.

そして、上記構成のシャープペンシルユニット１は、図３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及びボールペンリフィール９である。
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 in the multifunctional retractable writing instrument A as illustrated in FIG.
The multifunctional retractable writing instrument A projects the front end writing portion of the refill connected to the advanced piece a2 (or a3) forward from the front end of the barrel a1 by the operation of selectively advancing the plurality of pieces a2, a3. Let According to the illustrated example, the refills are the mechanical pencil unit 1 and the ballpoint refill 9.
The basic structure shown in, for example, JP-A-2014-198439 can be applied to the multifunctional retractable writing instrument A.

この多機能出没式筆記具Ａにおいて、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。 In this multifunctional retractable writing instrument A, for example, a piece a2 having a clip a6 with an opening/closing function is operated forward against the biasing force of a coil spring a4, and a mechanical pencil unit 1 (refill) connected to this piece a2. When the front end writing portion of the above projects forward from the front end opening of the shaft cylinder a1, the piece a2 is locked by the locking portion a5 provided in the shaft cylinder a1, and this protruding state is maintained.
When the clip a6 is advanced in this protruding state, the lead core x is extended from the front end of the mechanical pencil unit 1.

シャープペンシルユニット１は、軸筒ａ１内で進退する際に、隣接するボールペンリフィール９や、軸筒ａ１の内周面に当接する可能性がある。
しかしながら、上記構成によれば、この当接の際の衝撃を、シャープペンシルユニット１の外周部の緩衝部材１４によって緩和することができる。
特に、運動方向変換機構Ｍ２を備えたシャープペンシルユニットでは、ホルダー２０が径方向へ振動し易い傾向にあるが、上記構成によれば、ホルダー２０の径方向への振動により、ホルダー２０に挿通されている鉛芯ｘが損傷するのを効果的に防ぐことができる。
しかも、上記構成のシャープペンシルユニット１では、緩衝部材１４を第２の筒部１２と第３の筒部１３の間に挟むようにして配設しているため、この緩衝部材１４が前記衝撃等によって外れたり位置ずれしたりするのを防ぐことができる。 The mechanical pencil unit 1 may come into contact with the adjacent ball-point pen refill 9 or the inner peripheral surface of the shaft cylinder a1 when moving back and forth within the shaft cylinder a1.
However, according to the above configuration, the impact at the time of this contact can be alleviated by the cushioning member 14 on the outer peripheral portion of the mechanical pencil unit 1.
Particularly, in the mechanical pencil unit including the movement direction conversion mechanism M2, the holder 20 tends to vibrate in the radial direction, but according to the above configuration, the holder 20 is inserted into the holder 20 due to the vibration in the radial direction. It is possible to effectively prevent damage to the lead core x.
Moreover, in the mechanical pencil unit 1 having the above-described configuration, since the cushioning member 14 is disposed so as to be sandwiched between the second tubular portion 12 and the third tubular portion 13, the cushioning member 14 is detached by the impact or the like. And can be prevented from being displaced.

＜第２の実施態様＞
次に、図４に示す実施態様について説明する。この実施態様は、上記シャープペンシルユニット１に対し、その一部を変更したものであるため、主にその変更部分について詳述し、重複する詳細説明を省略する。 <Second embodiment>
Next, the embodiment shown in FIG. 4 will be described. In this embodiment, a part of the mechanical pencil unit 1 is modified, and therefore the modified part will be mainly described in detail, and redundant detailed description will be omitted.

図４に示すシャープペンシルユニット２は、上記シャープペンシルユニット１に対し、第２の筒部１２、第３の筒部１３、緩衝部材１４を、それぞれ、第２の筒部１２’、第３の筒部１３’、緩衝部材１４’に置換したものである。 The mechanical pencil unit 2 shown in FIG. 4 is different from the mechanical pencil unit 1 in that the second tubular portion 12, the third tubular portion 13, and the cushioning member 14 are respectively provided in the second tubular portion 12′ and the third tubular portion 12′. The cylinder portion 13' and the cushioning member 14' are replaced.

第２の筒部１２’は、上記第２の筒部１２の中間部１２ｃを、外周面に環状凹部１２ｃ１’を有する中間部１２ｃ’に置換したものである。中間部１２ｃ’は、前後方向へ延設された円筒状の小径部として機能する。 The second tubular portion 12' is obtained by replacing the intermediate portion 12c of the second tubular portion 12 with an intermediate portion 12c' having an annular recess 12c1' on the outer peripheral surface. The intermediate portion 12c' functions as a cylindrical small-diameter portion extending in the front-rear direction.

第３の筒部１３’は、上記第３の筒部１３の前端部を前方へ延長して第２の筒部１２’の段部１２ｅに当接させたものである。この第３の筒部１３’は、中間部１２ｃ’（小径部）の後側に同芯状に並ぶ大径部であり、第２の筒部１２’の後側接続部１２ｆに環状に嵌め合わせられる。 The third tubular portion 13' is formed by extending the front end portion of the third tubular portion 13 forward and contacting it with the step portion 12e of the second tubular portion 12'. The third tubular portion 13' is a large-diameter portion arranged coaxially on the rear side of the intermediate portion 12c' (small-diameter portion), and is annularly fitted to the rear connecting portion 12f of the second tubular portion 12'. Can be matched.

緩衝部材１４’は、上述した緩衝部材１４よりも外形が大きく且つ太いＯリングにより形成される。
この緩衝部材１４’は、中間部１２ｃ’（小径部）の環状凹部１２ｃ１’に嵌め合わせられ、その外周部を第３の筒部１３’ （大径部）の外周面よりも径外方向へ突出させている。 The cushioning member 14 ′ is formed by an O-ring having a larger outer shape and a larger outer diameter than the cushioning member 14 described above.
The cushioning member 14' is fitted into the annular recess 12c1' of the intermediate portion 12c' (small diameter portion), and the outer peripheral portion thereof is radially outward from the outer peripheral surface of the third cylindrical portion 13' (large diameter portion). It is protruding.

環状凹部１２ｃ１’は、中間部１２ｃ’の外周面に、全周にわたる凹溝状に形成される。 The annular recess 12c1' is formed in a recessed groove shape over the entire circumference on the outer peripheral surface of the intermediate portion 12c'.

よって、図４に示すシャープペンシルユニット２によれば、緩衝部材１４’を小径部である中間部１２ｃ’に設けたので、この緩衝部材１４’の肉厚（太さ）を比較的大きく確保することができ、ひいては、緩衝部材１４’の弾性による緩衝作用を効果的に得ることができる。
しかも、大径部である第３の筒部１３’には、その大径な内部空間を有効に利用して、鉛芯繰出し機構Ｍ１等の複雑な機構を内在することができる。 Therefore, according to the mechanical pencil unit 2 shown in FIG. 4, since the cushioning member 14′ is provided in the intermediate portion 12c′ which is the small diameter portion, the cushioning member 14′ has a relatively large thickness (thickness). As a result, it is possible to effectively obtain the cushioning action due to the elasticity of the cushioning member 14′.
Moreover, in the third cylindrical portion 13′ which is the large diameter portion, a complex mechanism such as the lead core feeding mechanism M1 can be internally provided by effectively utilizing the large diameter internal space.

＜第３の実施態様＞
図５に示すシャープペンシルユニット３は、上記シャープペンシルユニット１に対し、第１の筒部１１、第３の筒部１３、緩衝部材１４を、それぞれ、第１の筒部１１”、第３の筒部１３’、緩衝部材１４”に置換したものである。 <Third embodiment>
The mechanical pencil unit 3 shown in FIG. 5 is different from the mechanical pencil unit 1 in that the first tubular portion 11, the third tubular portion 13, and the cushioning member 14 are provided in the first tubular portion 11 ″ and the third tubular portion 11, respectively. The cylinder portion 13′ and the cushioning member 14″ are replaced.

第１の筒部１１”は、上記第１の筒部１１の後端側を若干前方へ短くしたものである。この第１の筒部１１”は、第２の筒部１２の段部１２ｂから前方側へ所定寸法離れて位置し、第２の筒部１２の前側接続部１２ａに対し、圧入又は螺合等により環状に固定される。 The first tubular portion 11 ″ is formed by slightly shortening the rear end side of the first tubular portion 11 toward the front. The first tubular portion 11 ″ is a step 12 b of the second tubular portion 12. Is located at a predetermined distance from the front side to the front side connecting portion 12a of the second tubular portion 12 and is annularly fixed by press fitting, screwing, or the like.

また、第２の筒部１２の前側接続部１２ａは、前後方向へ延設された円筒状の小径部として機能する。この前側接続部１２ａ（小径部）の外周面と、第１の筒部１１”の後端部と、第２の筒部１２の段部１２ｂとは、緩衝部材１４”を装着するための環状凹部１２ｈを構成する。 Further, the front-side connecting portion 12a of the second tubular portion 12 functions as a cylindrical small-diameter portion extending in the front-rear direction. The outer peripheral surface of the front connecting portion 12a (small diameter portion), the rear end portion of the first tubular portion 11″, and the step portion 12b of the second tubular portion 12 form an annular shape for mounting the cushioning member 14″. The recess 12h is formed.

第３の筒部１３’は、シャープペンシルユニット２と同様に、上記第３の筒部１３の前端部を前方へ延長して第２の筒部１２の段部１２ｅに当接させたものである。
第２の筒部１２の中間部１２ｃと第３の筒部１３’は、前側接続部１２ａ（小径部）の後側に同芯状に並ぶ大径部であり、鉛芯繰出し機構Ｍ１等を内在する。 Similar to the mechanical pencil unit 2, the third tubular portion 13 ′ is formed by extending the front end portion of the third tubular portion 13 forward and contacting it with the step portion 12 e of the second tubular portion 12. is there.
The intermediate portion 12c and the third tubular portion 13' of the second tubular portion 12 are large-diameter portions arranged concentrically on the rear side of the front-side connecting portion 12a (small-diameter portion), and the lead-core feeding mechanism M1 and the like are provided. Inherent.

緩衝部材１４”は、上記緩衝部材１４’よりも更に外形が大きく且つ太いＯリングであり、保持筒１０の最大径部分（図示例によれば第３の筒部１３’の外径部）よりも径方向外側へ突出するように、その外径が設定されている。
この緩衝部材１４”は、環状凹部１２ｈに嵌め合わせられる。 The cushioning member 14″ is an O-ring having a larger outer diameter and a larger diameter than the cushioning member 14′, and is larger than the maximum diameter portion of the holding cylinder 10 (the outer diameter portion of the third cylinder portion 13′ according to the illustrated example). The outer diameter is also set so as to project outward in the radial direction.
The cushioning member 14″ is fitted into the annular recess 12h.

よって、図５に示すボールペンリフィール９によれば、緩衝部材１４”をより小径な前側接続部１２ａに設けたので、この緩衝部材１４”の肉厚（太さ）をさらに大きくすることができ、ひいては、緩衝部材１４”の弾性による緩衝作用をいっそう効果的に得ることができる。
しかも、前側接続部１２ａ（小径部）よりも後側の大径部には、その広い内部空間を有効に利用して、鉛芯繰出し機構Ｍ１等の複雑な機構を内在することができる。
その上、緩衝部材１４”を、第１の筒部１１”後端部と第２の筒部１２の段部１２ｂとの間に挟むように配置しているため、この緩衝部材１４”が外れたり位置ずれしたりするのを防ぐことができる。 Therefore, according to the ball-point pen refill 9 shown in FIG. 5, since the cushioning member 14″ is provided in the smaller-diameter front side connecting portion 12a, the thickness (thickness) of this cushioning member 14″ can be further increased, As a result, the cushioning action due to the elasticity of the cushioning member 14″ can be obtained more effectively.
Moreover, in the large diameter portion on the rear side of the front side connection portion 12a (small diameter portion), a complicated mechanism such as the lead core feeding mechanism M1 can be internally provided by effectively utilizing the large internal space.
Moreover, since the cushioning member 14″ is arranged so as to be sandwiched between the rear end portion of the first tubular portion 11″ and the step portion 12b of the second tubular portion 12, the cushioning member 14″ is removed. And can be prevented from being displaced.

＜変形例＞
なお、図示例以外の他例としては、上記構成の緩衝部材１４を、第１の筒部１１の外周部や、第３の筒部１３の外周部、環状傾斜面部１２ｄの外周部等、図示例以外の部分に配置することも可能である。
さらに、他例としては、緩衝部材１４を前後方向にわたって複数箇所に設けることも可能である。 <Modification>
Note that, as another example other than the illustrated example, the cushioning member 14 having the above-described configuration may be used for the outer peripheral portion of the first cylindrical portion 11, the outer peripheral portion of the third cylindrical portion 13, the outer peripheral portion of the annular inclined surface portion 12d, and the like. It is also possible to arrange in a portion other than the example shown.
Further, as another example, it is possible to provide the cushioning member 14 at a plurality of positions in the front-rear direction.

また、緩衝部材１４の他例としては、Ｏリング形状以外の環状や筒状に形成することも可能である。 Further, as another example of the cushioning member 14, it is possible to form it in an annular shape or a tubular shape other than the O-ring shape.

また、上記実施の形態によれば、保持筒１０を三つの筒状部材から構成したが、この保持筒１０は、上記緩衝部材の装着を可能にすれば、単数、２つ、あるいは４以上の筒状部材から構成することが可能である。 Further, according to the above-described embodiment, the holding cylinder 10 is composed of three tubular members. However, if the holding cylinder 10 can be mounted with the cushioning member, the holding cylinder 10 may include one, two, or four or more members. It can be made of a tubular member.

また、上記実施態様では、特に好ましい一例として、シャープペンシルユニット１を具備して多機能出没式筆記具Ａを構成したが、他例としては、単数のシャープペンシルユニット１を軸筒内に出没可能に収納した出没式筆記具や、シャープペンシルユニット１を軸筒内に固定するとともにその筆記部を前方へ突出させたシャープペンシル等を構成することも可能である。 Further, in the above-described embodiment, as a particularly preferable example, the multi-function retractable writing instrument A is provided with the mechanical pencil unit 1. However, as another example, a single mechanical pencil unit 1 can be retracted in the barrel. It is also possible to configure a retractable writing instrument housed therein, a mechanical pencil in which the mechanical pencil unit 1 is fixed in the barrel, and a writing portion of which is projected forward.

また、本発明は上述した上記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。 Further, the present invention is not limited to the above-mentioned embodiment, and can be appropriately modified without changing the gist of the present invention.

１，２，３：シャープペンシルユニット
１０：保持筒
１１，１１”：第１の筒部
１２，１２’：第２の筒部
１２ｃ１’，１２ｈ：環状凹部
１３，１３’：第３の筒部
１４，１４’，１４”：緩衝部材
２０：ホルダー
２３：ホルダー付勢部材
Ａ：多機能出没式筆記具
Ｍ１：鉛芯繰出し機構
Ｍ２：運動方向変換機構
ｘ：鉛芯
1,2,3: Mechanical pencil unit 10: Holding cylinder 11, 11": First cylinder part 12, 12': Second cylinder part 12c1', 12h: Annular recess 13,13': Third cylinder part 14, 14', 14": Buffer member 20: Holder 23: Holder biasing member A: Multi-functional retractable writing instrument M1: Lead core feeding mechanism M2: Movement direction conversion mechanism x: Lead core

Claims

A holding tube, a holder that projects from the front end opening of the holding tube and inserts a lead core, a movement direction conversion mechanism that advances the holder relative to the holding tube by a radial force component applied to the holder, and a holding member. And a lead core feeding mechanism for feeding the lead core into the holder from the rear side, and a buffer member made of an elastic material is provided on an outer peripheral portion of the holding cylinder.

The holding cylinder is configured by connecting a plurality of tubular members to the front and rear,
The sharpening member according to claim 1, wherein the cushioning member is provided between the tubular members adjacent to each other in the front-rear direction, and an outer peripheral portion of the cushioning member projects outward in the radial direction from the tubular members in the front-rear direction. Pencil unit.

The holding cylinder has a cylindrical small-diameter portion extending in the front-rear direction, and a cylindrical large-diameter portion arranged concentrically with the small-diameter portion,
3. The mechanical pencil unit according to claim 1, wherein the cushioning member has an outer peripheral portion protruding outward in the radial direction with respect to the large diameter portion.

A retractable writing instrument comprising the mechanical pencil unit according to claim 1.