JP3860250B2

JP3860250B2 - Tip chuck type mechanical pencil

Info

Publication number: JP3860250B2
Application number: JP11966896A
Authority: JP
Inventors: 裕之渡辺
Original assignee: パイロットプレシジョン株式会社
Priority date: 1996-04-17
Filing date: 1996-04-17
Publication date: 2006-12-20
Anticipated expiration: 2016-04-17
Also published as: JPH09277779A

Description

【０００１】
【産業上の利用分野】
本発明は、口金および軸筒からなる本体内に芯の後退を防止する先端チャックと、一定量づつ芯を繰り出す繰出チャックを設けた先端チャック式シャープペンシルに関する。
【０００２】
【従来の技術】
従来、短くなった芯でも筆記可能なノック式シャープペンシルとしては、図７に示したような先端チャック１０４と繰出チャック５を設けた先端チャック式シャープペンシルが知られている。これは繰出チャック５が内スプリング９により長手方向に付勢されて軸筒１１２内に設けられ、繰出チャック５に固着された芯タンク７には軸筒１１２の後端より突出する押圧部材１１３が固着され、繰出チャック５、芯タンク７および押圧部材１１３は共に軸筒１１２内を回動してしまう構成となっていた。
【０００３】
【発明が解決しようとする課題】
しかし、図７に示した先端チャック式シャープペンシルは、使用者がなにげなく押圧部材１１３を回動させると、芯タンク７と共に繰出チャック５も回動してしまい、先端チャック１０４に保持された芯１１の前部と、繰出チャック５に保持された芯１１の後部がねじれて芯１１を破損してしまうものであった。すると、破損した芯１１が先端チャック１０４と繰出チャック５の間に入り込んで芯１１の繰り出しを妨害したり、前の芯１１の破損部と後の芯１１の破損部がずれて、後の芯１１で前の芯１１を押し出すことが出来なくなってしまうものであった。
そこで、繰出チャックに固着した芯タンクと押圧部材を分離し、押圧部材が回動しても芯タンクが回動しないように構成した先端チャック式シャープペンシルが考えられたが、押圧部材で芯タンクを押圧しながら回動させると、押圧部材と共に繰出チャックも回動してしまい、やはり芯をねじって破損してしまう恐れがあった。
本発明は、上記課題を解消する先端チャック式シャープペンシルを提供することを目的とするものである。
【０００４】
【課題を解決するための手段】
上記目的を達成するために本発明は、軸筒と、軸筒の前部に設けられた口金と、口金内に内蔵されかつ長手方向後方に付勢されて芯を保持する為の先端チャックと、先端チャックより長手方向後方に位置し、芯を繰り出す為の繰出チャックとからなり、軸筒の後端より突出した押圧部材を前進させることにより繰出チャックが前進して芯を繰り出す先端チャック式シャープペンシルにおいて、次の構成をとる。
すなわち、本発明に係る先端チャック式シャープペンシルは、繰出チャックの後部に芯タンクを固着し、該芯タンクと押圧部材を回動可能に分離し、かつ押圧部材の突起を軸筒の長手方向に伸びた開口窓に係合させた構成とする。
【０００５】
【実施例】
図１、図２、図３、図４および図５は本発明の第１実施例を示したもので、図４に示したように合成樹脂製の口金１の後部に長手方向に伸びた摺動溝１Ａを互いに対向させて形成し、更にそれぞれの摺動溝１Ａより口金１の後端に連通して挿入溝１Ｂを形成する。該挿入溝１Ｂは長手方向後方に行くに従って幅が広がるように形成する。口金１の先端開口部１Ｃには金属製の先端締具２が固着される。また、内筒３の後部は切溝３Ａにより半割りにされ、更に図５に示したように半割りされたそれぞれの後部外面には突起３Ｂが形成される。該突起３Ｂの長手方向前面は尖って形成される。更に内筒３の内側には内段３Ｃと内方突起３Ｄにより凹溝３Ｅが形成される。内筒３の前部には黄銅等の金属で作製された先端チャック４の後部が固着される。繰出チャック５の頭部には締具６が外嵌され、繰出チャック５の後部には芯タンク７が固着される。締具６を受ける連結具８と芯タンク７の間には内スプリング９が張架され、繰出チャック５の頭部が締具６に押圧される。連結具８は前記内筒３の後方より挿入され、内筒３の凹溝３Ｅに着脱可能に係合される。締具６は内筒３の係止段３Ｆと連結具８の間を摺動可能に遊嵌され、通常は連結具８に押圧されている。繰出チャック５、締具６等を内蔵しかつ前部に先端チャック４を固着した内筒３は前記口金１の後端より挿入され、先端チャック４の頭部が前記先端締具２を挿通して先端より突出する。また、内筒３の突起３Ｂが口金１の挿入溝１Ｂを通って摺動溝１Ａに挿入される。従って、内筒３の突起３Ｂが摺動溝１Ａの後端縁１Ｄに係合され、内筒３が口金１より抜け出るのを防止する。口金１の内段１Ｅと内筒３の外段３Ｇとの間には外スプリング１０が張架され、該外スプリング１０によって先端チャック４は長手方向後方に付勢される。先端チャック４内に芯１１が挿通した状態では、先端チャック４の頭部４Ａが先端締具２に押圧されて閉じられ、芯１１を強固に保持する。口金１の後部には軸筒１２が螺合され、該軸筒１２の後部に開口窓１２Ａが形成される。押圧部材１３の前部には長手方向に伸びた２本の切溝１３Ａによって弾性片１３Ｂが形成され、該弾性片１３Ｂに突起１３Ｃが形成される。押圧部材１３の前部は軸筒１２の後端より挿入され、押圧部材１３の突起１３Ｃが前記軸筒１２の開口窓１２Ａに嵌め込まれる。芯タンク７の後部は押圧部材１３の前部内孔１３Ｄに挿入され、芯タンク７の横振れが規制される。押圧部材１３の後部内側には消しゴム１４が設けられ、押圧部材１３の後部外側には消しゴム１４を覆うノブ１５が嵌合される。
【０００６】
以上説明した第１実施例においては、軸筒１２に口金１を取り付けたり、軸筒１２より口金１を外すために口金１を回転させた時、押圧部材１３と芯タンク７が分離されているために、芯タンク７の回転が妨げられず、口金１と共に先端チャック４および繰出チャック５が回転する。従って、先端チャック４と繰出チャック５がねじれて芯１１を破損する恐れは全くない。
その上、押圧部材１３に取り付けられたノブ１５を押圧して芯１１を繰り出す時に、ノブ１５が回転させられたとしても、押圧部材１３の突起１３Ｃが軸筒１２の開口窓１２Ａに係合しているので、押圧部材１３は前進はするが回転はしない。従って、ノブ１５が回転したとしても、押圧部材１３および押圧部材１３に圧接された芯タンク７が回転する恐れは全くない。従って、この場合においても先端チャック４と繰出チャック５がねじれて芯１１を破損する恐れは全くない。
【０００７】
図６は本発明の第２実施例を示したもので、先端チャック４を固着した内筒１０３にゴム製の芯ホルダー１６を取り付け、繰出チャック５によって繰り出された芯１１が前記芯ホルダー１６により軽く保持される。その他の構成については第１実施例と同様である。
【０００８】
【発明の効果】
以上説明した本発明の先端チャック式シャープペンシルは、頭部に先端チャックを取り付けた内筒の突起が口金の摺動溝に挿入されているので、口金と先端チャックは回動不能に構成される。
更に、繰出チャックが押圧部材と回動可能に分離され、かつ押圧部材と軸筒が回動不能に構成されている。従って、口金を回動した時、先端チャックおよび繰出チャックも口金とともに回動する。
また、ノブを押圧した時、ノブが回動しても押圧部材は回動しないので、押圧部材によって芯タンクおよび繰出チャックが回動させられる恐れはない。更に、先端チャックは口金と回動不能に構成されているので、先端チャックに回転方向への応力が働いても先端チャックは回動しない。
以上の理由から、先端チャックと繰出チャックがねじれる原因が除かれ、芯を破損する恐れが全くなく、確実に芯を繰り出せる効果が奏せられるものである。
【図面の簡単な説明】
【図１】本発明の第１実施例を示す断面図である。
【図２】図１のＡ−Ａ線を示す断面図である。
【図３】図１のＢ−Ｂ線を示す断面図である。
【図４】第１実施例の先端締具および口金を示す平面図である。
【図５】第１実施例の内筒を示す平面図である。
【図６】本発明の第２実施例を示す主要部断面図である。
【図７】従来の先端チャック式シャープペンシルを示す主要部断面図である。
【符号の説明】
１口金
４先端チャック
５繰出チャック
７芯タンク
１１芯
１２軸筒
１２Ａ軸筒１２の開口窓
１３押圧部材
１３Ｃ押圧部材１３の突起[0001]
[Industrial application fields]
The present invention relates to a tip chuck type mechanical pencil provided with a tip chuck for preventing retraction of a lead in a main body including a base and a shaft tube, and a feeding chuck for feeding the lead by a fixed amount.
[0002]
[Prior art]
Conventionally, as a knock-type mechanical pencil capable of writing even with a shortened lead, a front-end chuck type mechanical pencil provided with a front end chuck 104 and a feeding chuck 5 as shown in FIG. 7 is known. This is because the feeding chuck 5 is urged in the longitudinal direction by the inner spring 9 and is provided in the shaft cylinder 112, and the core tank 7 fixed to the feeding chuck 5 has a pressing member 113 protruding from the rear end of the shaft cylinder 112. The feeding chuck 5, the lead tank 7, and the pressing member 113 are all configured to rotate within the shaft cylinder 112.
[0003]
[Problems to be solved by the invention]
However, in the tip chuck type mechanical pencil shown in FIG. 7, when the user continuously turns the pressing member 113, the feeding chuck 5 is also turned together with the lead tank 7, and the lead 11 held by the tip chuck 104. And the rear part of the lead 11 held by the feeding chuck 5 are twisted and the lead 11 is damaged. Then, the broken core 11 enters between the tip chuck 104 and the feeding chuck 5 to obstruct the feeding of the core 11, or the damaged portion of the front core 11 and the damaged portion of the rear core 11 are shifted to cause the rear core. 11, the previous core 11 could not be pushed out.
Therefore, a tip chuck type mechanical pencil configured to separate the lead tank and the pressing member fixed to the feeding chuck so that the lead tank does not rotate even if the pressing member rotates is considered. When rotating while pressing, the feeding chuck also rotates together with the pressing member, and there is a possibility that the core is twisted and damaged.
An object of the present invention is to provide a tip chuck type mechanical pencil that solves the above problems.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, the present invention includes a shaft tube, a base provided at a front portion of the shaft tube, a tip chuck incorporated in the base and urged rearward in the longitudinal direction to hold the core. The tip chuck type sharp, which is located at the rear of the tip chuck in the longitudinal direction and that feeds the lead, and advances the pressing member that protrudes from the rear end of the shaft cylinder advances the feed chuck to feed the lead The pencil has the following configuration.
That is, the tip chuck type mechanical pencil according to the present invention has a lead tank fixed to the rear part of the feeding chuck, the lead tank and the pressing member are separated so as to be rotatable, and the protrusion of the pressing member is arranged in the longitudinal direction of the shaft cylinder. It is set as the structure engaged with the extended opening window.
[0005]
【Example】
1, FIG. 2, FIG. 3, FIG. 4 and FIG. 5 show a first embodiment of the present invention. As shown in FIG. 4, a slide extending in the longitudinal direction at the rear part of the synthetic resin base 1 is shown. The moving grooves 1A are formed so as to face each other, and the insertion grooves 1B are formed by communicating with the rear ends of the caps 1 from the respective sliding grooves 1A. The insertion groove 1B is formed so that its width increases as it goes rearward in the longitudinal direction. A metal tip fastener 2 is fixed to the tip opening 1 C of the base 1. Further, the rear portion of the inner cylinder 3 is halved by a kerf 3A, and a projection 3B is formed on the outer surface of each rear portion that is halved as shown in FIG. The front surface in the longitudinal direction of the protrusion 3B is formed to be sharp. Further, a concave groove 3E is formed inside the inner cylinder 3 by an inner step 3C and an inward projection 3D. A rear portion of the tip chuck 4 made of a metal such as brass is fixed to the front portion of the inner cylinder 3. A fastener 6 is fitted on the head of the feeding chuck 5, and a lead tank 7 is fixed to the rear part of the feeding chuck 5. An inner spring 9 is stretched between the connector 8 that receives the fastener 6 and the lead tank 7, and the head of the feeding chuck 5 is pressed against the fastener 6. The connector 8 is inserted from the rear of the inner cylinder 3 and is detachably engaged with the concave groove 3E of the inner cylinder 3. The fastener 6 is loosely slidably fitted between the locking step 3F of the inner cylinder 3 and the connector 8, and is normally pressed against the connector 8. The inner cylinder 3 having a feeding chuck 5, a fastener 6, etc., and a front end chuck 4 fixed to the front is inserted from the rear end of the base 1, and the head of the front end chuck 4 passes through the front end fastener 2. Protruding from the tip. Further, the protrusion 3B of the inner cylinder 3 is inserted into the sliding groove 1A through the insertion groove 1B of the base 1. Accordingly, the protrusion 3B of the inner cylinder 3 is engaged with the rear end edge 1D of the sliding groove 1A, and the inner cylinder 3 is prevented from coming out of the base 1. An outer spring 10 is stretched between the inner stage 1E of the base 1 and the outer stage 3G of the inner cylinder 3, and the tip chuck 4 is urged rearward in the longitudinal direction by the outer spring 10. In a state where the lead 11 is inserted into the tip chuck 4, the head 4 A of the tip chuck 4 is pressed and closed by the tip fastener 2 to hold the lead 11 firmly. A shaft cylinder 12 is screwed into the rear part of the base 1, and an opening window 12 A is formed in the rear part of the shaft cylinder 12. An elastic piece 13B is formed on the front portion of the pressing member 13 by two kerfs 13A extending in the longitudinal direction, and a protrusion 13C is formed on the elastic piece 13B. The front part of the pressing member 13 is inserted from the rear end of the shaft tube 12, and the protrusion 13 C of the pressing member 13 is fitted into the opening window 12 A of the shaft tube 12. The rear portion of the lead tank 7 is inserted into the front inner hole 13 D of the pressing member 13, and the lateral deflection of the lead tank 7 is restricted. An eraser 14 is provided inside the rear part of the pressing member 13, and a knob 15 that covers the eraser 14 is fitted to the rear part outer side of the pressing member 13.
[0006]
In the first embodiment described above, when the base 1 is attached to the shaft cylinder 12 or when the base 1 is rotated to remove the base 1 from the shaft cylinder 12, the pressing member 13 and the core tank 7 are separated. Therefore, the rotation of the lead tank 7 is not hindered, and the tip chuck 4 and the feeding chuck 5 rotate together with the base 1. Therefore, there is no possibility that the tip chuck 4 and the feeding chuck 5 are twisted and the core 11 is damaged.
In addition, even when the knob 15 is rotated when the knob 15 attached to the pressing member 13 is pressed and the core 11 is extended, the protrusion 13C of the pressing member 13 is engaged with the opening window 12A of the shaft cylinder 12. Therefore, the pressing member 13 moves forward but does not rotate. Therefore, even if the knob 15 rotates, there is no possibility that the pressing member 13 and the lead tank 7 pressed against the pressing member 13 rotate. Therefore, even in this case, there is no possibility that the tip chuck 4 and the feeding chuck 5 are twisted and the core 11 is damaged.
[0007]
FIG. 6 shows a second embodiment of the present invention. A rubber core holder 16 is attached to the inner cylinder 103 to which the tip chuck 4 is fixed, and the core 11 fed by the feeding chuck 5 is moved by the core holder 16. Lightly held. Other configurations are the same as those of the first embodiment.
[0008]
【The invention's effect】
In the tip chuck type mechanical pencil of the present invention described above, the projection of the inner cylinder having the tip chuck attached to the head is inserted into the sliding groove of the die, so that the die and the tip chuck are configured to be unrotatable. .
Furthermore, the feeding chuck is separated from the pressing member so as to be rotatable, and the pressing member and the shaft cylinder are configured so as not to be rotatable. Therefore, when the base is rotated, the tip chuck and the feeding chuck are also rotated together with the base.
Further, when the knob is pressed, the pressing member does not rotate even if the knob rotates, so there is no fear that the lead tank and the feeding chuck are rotated by the pressing member. Further, since the tip chuck is configured to be unrotatable with the base, the tip chuck does not rotate even if a stress in the rotation direction acts on the tip chuck.
For the above reasons, the cause of twisting of the tip chuck and the feeding chuck is eliminated, and there is no possibility of damaging the lead, and the effect of reliably feeding the lead can be achieved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a first embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along line AA in FIG.
FIG. 3 is a cross-sectional view taken along line BB in FIG.
FIG. 4 is a plan view showing a front end fastener and a base of the first embodiment.
FIG. 5 is a plan view showing an inner cylinder of the first embodiment.
FIG. 6 is a sectional view of the main part showing a second embodiment of the present invention.
FIG. 7 is a cross-sectional view of a main part showing a conventional tip chuck type mechanical pencil.
[Explanation of symbols]
1 Cap 4 Tip Chuck 5 Feeding Chuck 7 Core Tank 11 Core 12 Shaft 12A Opening Window 13 of Shaft 12 Pressing Member 13C Pressing Member 13 Protrusion

Claims

A shaft cylinder, a base screwed into the front part of the shaft cylinder, a tip chuck incorporated in the base and biased rearward in the longitudinal direction to hold the core, and positioned rearward in the longitudinal direction from the tip chuck A tip chuck type mechanical pencil comprising a feeding chuck for feeding the lead and a pressing member slidably attached to the shaft cylinder, wherein the feeding chuck advances by feeding the pressing member forward to feed the lead. The protrusion of the inner cylinder with the tip chuck attached to the front part is inserted into the sliding groove of the base, and further, the lead tank is fixed to the rear part of the feeding chuck, and the lead tank and the pressing member are pivotably separated. Further, by engaging the projection of the pressing member with the opening window extending in the longitudinal direction of the shaft tube, when the base is rotated to remove the base, the tip chuck and the feeding chuck rotate together with the base. Features and Tip chuck type mechanical pencil that.