【０００１】
【産業上の利用分野】
本発明は、ノック部材を押圧することによりチャックを前進させて芯を繰り出すノック式シャープペンシルに関する。
【０００２】
【従来の技術】
従来、芯タンクの後部にコップ状の蓋や消しゴムを嵌合し、該蓋や消しゴムを押圧してチャックを前進し、芯を繰り出すノック式シャープペンシルが知られている。
【０００３】
【発明が解決しようとする課題】
しかし、芯タンクに蓋や消しゴムを嵌合したものは、携帯時に芯タンクが軸筒内を揺動し、非常に不快感を与えるものであった。その上、芯タンク内に芯を挿入する時、蓋や消しゴムを外さなければならなかった。この蓋や消しゴムの嵌合力が弱いと筆記中や携帯中に蓋や消しゴムが外れて紛失してしまう恐れがある。又、蓋や消しゴムの嵌合力が強いと外す時にチャックが強い力で後方に引っ張られ、芯を食い切ってしまう心配があった。
本発明は、上記した課題を解消するノ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、ノック部材を押圧することにより芯タンクの前部に設けられたチャックを前進させて芯を繰り出すノック式シャープペンシルにおいて、後部に開口窓を形成した軸筒と、筒部に弾性片を形成し、該弾性片に隆起した係止部を形成したノック部材と、ノック部材の後部に設けられた蓋と、ノック部材を長手方向後方に付勢するリターンスプリングとからなり、ノック部材の係止部を前記軸筒の開口窓に長手方向に適宜の距離摺動可能に係止するとともに、軸筒とノック部材との間にリターンスプリングを張架し、ノック部材の筒部内孔に芯タンクの後部を挿入したことを要旨とする。
従って、ノック部材が長手方向後方への強い引張力を受けても、ノック部材が軸筒で係止され芯タンクは引張力を受けないのでチャックによる芯の食い切りはまったく生じない。
【０００５】
【実施例】
本発明の実施例を図面により説明する。図１および図２において、ノック部材１の筒部内孔１Ａに長手方向に伸びた突部１Ｂを等間隔に４個形成する。更に、ノック部材１の筒部１Ｃには長手方向に伸びた切溝１Ｄが並列に形成されて撓み可能な弾性片１Ｅを形成し、該弾性片１Ｅに隆起した係止部１Ｆを形成する。ノック部材１の芯挿入口１Ｇの底部１Ｈはすり鉢状に形成され、ノック部材１の後部外面には凹条１Ｉが形成される。ポリプロピレン等の合成樹脂製の蓋２の固定部２Ａ内面に等間隔に３個突部２Ｂが形成され、かつ固定部２Ａの外面に円周方向に伸びた凹部２Ｃが形成される。固定部２Ａには屈曲可能な帯片２Ｄにより開閉部２Ｅが連結され、開閉部２Ｅの内面に等間隔に３個突起２Ｆを形成する。開閉部２Ｅの外周面には、前記帯片２Ｄと対向する位置に周方向に突出した突出片２Ｇを形成する。該蓋２は固定部２Ａの突部２Ｂが前記ノック部材１の凹条１Ｉに嵌め込まれて固定され、前記ノック部材１の芯挿入口１Ｇが固定部２Ａの内側に位置する。蓋２の開閉部２Ｅに形成された突起２Ｆを固定部２Ａの凹部２Ｃに嵌合し、ノック部材１に形成された前記芯挿入口１Ｇを閉鎖する。軸筒３の後部には開口窓３Ａを形成し、該開口窓３Ａに軸筒３の後端より挿入したノック部材１の係止部１Ｆを嵌め込み、係止部１Ｆは開口窓３Ａ内を長手方向に適宜の距離摺動可能に構成する。ノック部材１は、軸筒３の内段３Ｂとノック部材１の前端との間に張架されたリターンスプリング４により長手方向後方に付勢される。芯繰出用の機構部は、チャック５とパイプ状の芯タンク６をコネクター７を介して連結し、チャック５の頭部に締リング８を外嵌する。この締リング８を受け止める連結具９と前記コネクター７との間にスプリング１０を張架し構成する。この機構部の芯タンク６およびコネクター７が軸筒３の前部孔３Ｃを挿通し、軸筒３内に内蔵される。しかも芯タンク６の後部は前記ノック部材１の筒部内孔１Ａに挿入され、筒部内孔１Ａに形成された突部１Ｂにより芯タンク６の横振れが規制される。軸筒３の前端と軸筒３の前部に螺合された口金１１の内段により前記連結具９を挾持し、機構部を取り付ける。口金１１内には芯１２を適宜の力で保持するゴム等の弾性体で構成された芯ホルダー１３が内蔵されている。
【０００６】
この実施例の場合には、機構部は口金１１を軸筒３から外すのみで取り外すことができ、故障等により機構部を取り替える時に、ノック部材１を外す必要がないので非常に便利である。しかも、芯タンク６をノック部材１の筒部内孔１Ａに挿入した状態では、弾性片１Ｅが内方に撓むことができないので、簡単な構成にもかかわらずノック部材１の係止部１Ｆは強固に軸筒３の開口窓３Ａに係止される。
【０００７】
又、芯タンク６内に芯１２を挿入する場合には、蓋２の開閉部２Ｅに形成した突出片２Ｇを指で押圧すれば開閉部２Ｅが固定部２Ａより外れて、ノック部材１に形成した芯挿入口１Ｇが開かれる。この状態で芯挿入口１Ｇより芯１２を挿入すれば、芯タンク６内に芯１２が収納できる。この時、開閉部２Ｅと固定部２Ａの嵌合を強く設定した場合でも、ノック部材１は強固に軸筒３に係止されているので、開閉部２Ｅを強い力で後方に引っ張り開閉部２Ｅを外す場合でも、ノック部材１は軸筒３から外れる恐れはない。しかも、芯タンク６とノック部材１は分離されているので、ノック部材１の後方への応力は芯タンク６に伝わらず、チャック５により芯１２を食い切る心配もない。
【００１２】
【発明の効果】
以上説明した本発明のノック式シャープペンシルは、簡単な構成でしかも容易にノック部材を軸筒に取り付けることができるとともに、芯タンクの横振れを防ぐことができるものである。その上、芯タンク内に芯を挿入する場合には、蓋の開閉部に形成した突出片を指で押圧すれば開閉部が固定部より外れて、ノック部材に形成した芯挿入口が開かれる。この状態で芯挿入口より芯を挿入すれば、芯タンク内に芯が収納できる。この時、開閉部と固定部の嵌合を強く設定した場合でも、ノック部材は強固に軸筒に係止されているので、開閉部を強い力で後方に引っ張り開閉部を外しても、ノック部材は軸筒から外れる恐れはない。しかも、芯タンクとノック部材は分離されているので、ノック部材の後方への応力は芯タンクに伝わらず、チャックにより芯を食い切る心配もないという効果が奏せられるものである。
【図面の簡単な説明】
【図１】 本発明のノック式シャープペンシルを示す断面図である。
【図２】 図１のＡ−Ａ線を示す拡大断面図である。
【符号の説明】
１ ノック部材
１Ａ ノック部材１の筒部内孔
１Ｃ ノック部材１の筒部
１Ｅ ノック部材１の弾性片
１Ｆ ノック部材１の係止部
２ 蓋
２Ａ 蓋２の固定部
２Ｄ 蓋２の帯片
２Ｅ 蓋２の開閉部
２Ｇ 蓋２の突出片
３ 軸筒
３Ａ 軸筒３の開口窓
４ リターンスプリング
５ チャック
６ 芯タンク
１２ 芯[0001]
[Industrial application fields]
The present invention relates to a knock type mechanical pencil that advances a chuck by pushing a knock member to feed a lead.
[0002]
[Prior art]
Conventionally, a knock-type mechanical pencil is known in which a cup-shaped lid or eraser is fitted to the rear part of the lead tank, the lid or eraser is pressed to advance the chuck, and the lead is drawn out.
[0003]
[Problems to be solved by the invention]
However, when the core tank is fitted with a lid or an eraser, the core tank swings in the shaft cylinder when being carried, which is very uncomfortable. In addition, the lid and eraser had to be removed when inserting the lead into the lead tank. If the fitting force of the lid or eraser is weak, the lid or eraser may come off and be lost during writing or carrying. Further, when the fitting force of the lid and the eraser is strong, there is a concern that when removing the chuck, the chuck is pulled backward with a strong force and bites the core.
An object of the present invention is to provide a knock mechanical pencil that solves the above-described problems.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a knock type mechanical pencil in which a chuck provided at the front part of a lead tank is advanced by pressing a knock member to feed the lead, and a shaft cylinder having an opening window formed at the rear part. A knock member in which an elastic piece is formed in the cylindrical portion, and a locking portion raised on the elastic piece is formed; a lid provided at the rear portion of the knock member; and a return spring that urges the knock member rearward in the longitudinal direction The locking portion of the knock member is locked to the opening window of the shaft cylinder so as to be slidable by an appropriate distance in the longitudinal direction, and a return spring is stretched between the shaft cylinder and the knock member, The gist is that the rear part of the core tank is inserted into the cylindrical inner hole of the member.
Therefore, even if the knock member receives a strong tensile force in the rearward direction in the longitudinal direction, the knock member is locked by the shaft cylinder and the lead tank does not receive the tensile force, so that no biting of the lead by the chuck occurs.
[0005]
【Example】
Embodiments of the present invention will be described with reference to the drawings. 1 and 2, four protrusions 1B extending in the longitudinal direction are formed at equal intervals in the cylindrical portion inner hole 1A of the knock member 1. Furthermore, a cut groove 1D extending in the longitudinal direction is formed in parallel on the cylindrical portion 1C of the knock member 1 to form a flexible elastic piece 1E, and a locking portion 1F raised from the elastic piece 1E is formed. A bottom portion 1H of the core insertion opening 1G of the knock member 1 is formed in a mortar shape, and a recess 1I is formed on the rear outer surface of the knock member 1. Three protrusions 2B are formed at equal intervals on the inner surface of the fixed portion 2A of the lid 2 made of synthetic resin such as polypropylene, and a concave portion 2C extending in the circumferential direction is formed on the outer surface of the fixed portion 2A. An opening / closing part 2E is connected to the fixed part 2A by a bendable strip 2D, and three protrusions 2F are formed at equal intervals on the inner surface of the opening / closing part 2E. On the outer peripheral surface of the opening / closing part 2E, a protruding piece 2G protruding in the circumferential direction is formed at a position facing the strip 2D. The lid 2 is fixed by the protrusion 2B of the fixing portion 2A being fitted into the recess 1I of the knock member 1, and the core insertion port 1G of the knock member 1 is located inside the fixing portion 2A. The protrusion 2F formed on the opening / closing portion 2E of the lid 2 is fitted into the recess 2C of the fixing portion 2A, and the core insertion port 1G formed on the knock member 1 is closed. An opening window 3A is formed at the rear portion of the shaft tube 3, and the locking portion 1F of the knock member 1 inserted from the rear end of the shaft tube 3 is fitted into the opening window 3A. The locking portion 1F extends longitudinally inside the opening window 3A. It is configured to be slidable by an appropriate distance in the direction. The knock member 1 is urged rearward in the longitudinal direction by a return spring 4 stretched between the inner stage 3 </ b> B of the shaft tube 3 and the front end of the knock member 1. The mechanism for feeding the core connects the chuck 5 and the pipe-shaped core tank 6 via the connector 7, and externally fits the fastening ring 8 to the head of the chuck 5. A spring 10 is stretched between the connector 9 that receives the tightening ring 8 and the connector 7. The core tank 6 and connector 7 of this mechanism part are inserted into the front hole 3 </ b> C of the shaft cylinder 3 and incorporated in the shaft cylinder 3. Moreover, the rear portion of the core tank 6 is inserted into the cylindrical portion inner hole 1A of the knock member 1, and the lateral deflection of the core tank 6 is restricted by the protrusion 1B formed in the cylindrical portion inner hole 1A. The connecting tool 9 is held by the inner stage of the base 11 screwed to the front end of the shaft tube 3 and the front portion of the shaft tube 3, and the mechanism portion is attached. A core holder 13 made of an elastic body such as rubber that holds the core 12 with an appropriate force is built in the base 11.
[0006]
In the case of this embodiment, the mechanism part can be removed simply by removing the base 11 from the shaft tube 3, and it is not necessary to remove the knock member 1 when replacing the mechanism part due to a failure or the like, which is very convenient. Moreover, in a state where the core tank 6 is inserted into the cylindrical portion inner hole 1A of the knock member 1, the elastic piece 1E cannot be bent inward, so that the locking portion 1F of the knock member 1 is not limited to a simple configuration. The shaft 3 is firmly locked to the opening window 3A.
[0007]
Further, when the lead 12 is inserted into the lead tank 6, if the protruding piece 2G formed on the opening / closing portion 2E of the lid 2 is pressed with a finger, the opening / closing portion 2E is detached from the fixed portion 2A and formed on the knock member 1. The inserted core insertion opening 1G is opened. If the lead 12 is inserted from the lead insertion port 1G in this state, the lead 12 can be stored in the lead tank 6. At this time, even when the fitting between the opening / closing portion 2E and the fixing portion 2A is strongly set, the knock member 1 is firmly locked to the shaft tube 3, so that the opening / closing portion 2E is pulled backward by a strong force. There is no fear that the knock member 1 will be detached from the shaft tube 3 even when removing. In addition, since the lead tank 6 and the knock member 1 are separated, the stress behind the knock member 1 is not transmitted to the lead tank 6, and there is no fear that the chuck 12 will eat away the lead 12.
[0012]
【The invention's effect】
The knock type mechanical pencil of the present invention described above has a simple configuration and can easily attach the knock member to the shaft tube and can prevent the core tank from sideways. In addition, when inserting the lead into the lead tank, if the protruding piece formed on the opening / closing portion of the lid is pressed with a finger, the opening / closing portion is released from the fixed portion, and the lead insertion port formed in the knock member is opened. . If the lead is inserted from the lead insertion port in this state, the lead can be stored in the lead tank. At this time, even when the fitting of the opening / closing part and the fixing part is set strongly, the knock member is firmly locked to the shaft tube, so even if the opening / closing part is pulled backward with a strong force and the opening / closing part is removed, There is no risk that the member will come off the barrel. In addition, since the lead tank and the knock member are separated from each other, the rearward stress of the knock member is not transmitted to the lead tank, and there is an effect that there is no fear of biting the lead by the chuck .
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a knock mechanical pencil of the present invention.
FIG. 2 is an enlarged cross-sectional view taken along line AA in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Knock member 1A Cylinder inner hole of knock member 1 1C Cylinder part of knock member 1 1E Elastic piece of knock member 1 1F Locking part of knock member 1 2 Lid 2A Fixing part of lid 2 2D Strip 2E Lid 2 Opening and closing part 2G Projection piece of lid 2 3 Shaft cylinder 3A Opening window of shaft cylinder 3 4 Return spring 5 Chuck 6 core tank 12 core
