JP6512631B2 - Ballpoint pen tip and writing instrument equipped with the same - Google Patents
Ballpoint pen tip and writing instrument equipped with the same Download PDFInfo
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- JP6512631B2 JP6512631B2 JP2015039570A JP2015039570A JP6512631B2 JP 6512631 B2 JP6512631 B2 JP 6512631B2 JP 2015039570 A JP2015039570 A JP 2015039570A JP 2015039570 A JP2015039570 A JP 2015039570A JP 6512631 B2 JP6512631 B2 JP 6512631B2
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- 238000012546 transfer Methods 0.000 claims description 33
- 238000003780 insertion Methods 0.000 claims description 13
- 230000037431 insertion Effects 0.000 claims description 13
- 230000002093 peripheral effect Effects 0.000 claims description 13
- 238000003825 pressing Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 238000010348 incorporation Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
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- Pens And Brushes (AREA)
Description
本発明は、転写ボールをチップ本体内の弾発部材により後方側から弾発してチップ本体前端側の内向き環状突起に押し付けるようにしたボールペンチップ及び該ボールペンチップを具備した筆記具に関するものである。 The present invention relates to a ballpoint pen tip in which a transfer ball is resiliently urged from behind by a resilient member in a tip body and pressed against an inward annular projection on the front end side of the tip body, and a writing instrument equipped with the ballpoint tip.
従来、この種の発明には、特許文献１に記載されるように、チップ本体（ボールホルダー１）内の内向き環状突起（先端開口部１ｂ）に、その後方側から転写ボール（ボール１０）の前半部側を接触させるとともに、該転写ボール（ボール１０）をその後方側から弾発部材のストレート部（先端ストレート部１２ａ）により押圧するようにしたものがある。
ところで、このような従来技術では、製造中などに、ストレート部が撓んで中心からずれ、該ストレート部の前端がチップ内の微小な凹凸等にひっかかって、組込不良を生じるおそれがある。
そこで、特許文献２に記載される発明では、螺旋バネ（３０）におけるストレート部（３２）の後端側に連なる小径バネ部（３４）の前端側を、チップ本体内前端側のインク孔（２４）の内周面に接触させて、ストレート部（３２）が中心からずれるのを抑制するようにしている。
Conventionally, in this type of invention, as described in Patent Document 1, the inward annular projection (tip opening 1b) in the tip body (ball holder 1) is transferred from the rear side to the transfer ball (ball 10) And the transfer ball (ball 10) is pressed from the rear side by the straight portion (tip straight portion 12a) of the resilient member.
By the way, in such a prior art, there is a possibility that the straight portion may be bent and deviated from the center during manufacturing or the like, and the front end of the straight portion may be caught by a minute unevenness or the like in the chip to cause a built-in failure.
Therefore, in the invention described in Patent Document 2, the front end side of the small diameter spring portion (34) connected to the rear end side of the straight portion (32) in the helical spring (30) Contact with the inner circumferential surface of the) to prevent the straight portion (32) from shifting from the center.
しかしながら、後者従来技術においても、チップ本体（２０）内に螺旋バネ（３０）が組み込まれて、該螺旋バネ（３０）に荷重が加わると、該螺旋バネ（３０）における小径バネ部（３４）よりも後側の部分（バネ本体部３６）がうねるようにして撓むとともに、ストレート部（３２）の前端側が傾いてチップ内の微小な凹凸等に引っかかってしまうおそれがあり、さらなる改善の余地があった。 However, also in the latter prior art, when the helical spring (30) is incorporated in the tip body (20) and a load is applied to the helical spring (30), the small diameter spring portion (34) in the helical spring (30) There is a possibility that the front end side of the straight portion (32) may be inclined and hooked on a minute unevenness or the like in the tip while the portion on the rear side (spring main body portion 36) bends and swells, and there is room for further improvement. there were.
本発明は上記従来事情に鑑みてなされたものであり、その課題とする処は、弾発部材の組込不良を低減することができるボールペンチップ及び該ボールペンチップを具備した筆記具を提供することにある。 The present invention has been made in view of the above-described conventional circumstances, and the object of the present invention is to provide a ballpoint pen tip capable of reducing a failure in incorporating a resilient member and a writing tool provided with the ballpoint pen tip. is there.
上記課題を解決するための一手段は、内部を前後方向へ貫通した略筒状のチップ本体と、該チップ本体内の前端側に収容されるとともに外周面前端側を該チップ本体から前方へ突出させた転写ボールと、チップ本体内における前記転写ボールよりも後方側に配置された弾発部材とを備え、チップ本体内の内向き環状突起に、その後方側から前記転写ボールの前半部側を接触させるとともに、前記転写ボールをその後方側から前記弾発部材により押圧するようにしたボールペンチップにおいて、前記弾発部材は、前記チップ本体の中心線方向へ延びるとともにその前端部を前記転写ボールの後端側に接触させたストレート部と、該ストレート部の後方に連なる小径コイルバネ部と、該小径コイルバネ部の後方に連なるとともに小径コイルバネ部よりも外径の大きい大径コイルバネ部とを一体に有し、チップ本体内には、前記転写ボールを回転自在に収容するボールハウスと、該ボールハウスの後方側に連通するとともに前記小径コイルバネ部の少なくとも一部を内在する小径孔と、該小径孔の後方側に連通するとともに前記大径コイルバネ部の少なくとも一部を内在する大径孔とが形成され、前記大径孔は、前記大径コイルバネ部の外径面に摺接して該大径コイルバネ部を軸方向へ案内するように形成され、前記大径孔よりも後方側には、前記大径コイルバネ部の外径面との間に隙間を確保するように、前記大径孔よりも内径の大きい遊挿孔が連通していることを特徴とする。 One means for solving the above problems is a substantially cylindrical chip main body which penetrates the inside in the front and rear direction, and a front end side accommodated in the chip main body and an outer peripheral surface front end side projecting forward from the chip main body And an elastic member disposed on the back side of the transfer ball in the chip body, and the inward annular protrusion in the chip body, the front side of the transfer ball from the rear side In the ballpoint pen tip in which the transfer ball is pressed by the resilient member from behind with the contact, the resilient member extends in the direction of the center line of the tip body and has its front end portion of the transfer ball. A straight portion brought into contact with the rear end side, a small diameter coil spring portion connected to the rear of the straight portion, and a rear portion connected to the rear of the small diameter coil spring portion A large diameter coil spring portion having a large outer diameter is integrally formed, and in the chip main body, a ball house rotatably accommodating the transfer ball, and a rear side of the ball house are communicated with the small diameter coil spring portion And a large diameter hole communicating with the rear side of the small diameter hole and containing at least a portion of the large diameter coil spring portion, the large diameter hole having the large diameter hole The large diameter coil spring portion is formed to be in sliding contact with the outer diameter surface of the coil spring portion so as to guide the large diameter coil spring portion in the axial direction, and between the large diameter coil spring portion and the outer diameter surface of the large diameter coil spring portion In order to secure a gap, free insertion holes having a larger inside diameter than the large diameter holes are in communication.
本発明は、以上説明したように構成されているので、弾発部材の組込不良を低減することができる。 The present invention is configured as described above, so that it is possible to reduce the incorporation failure of the resilient member.
本実施の形態の第一の特徴は、内部を前後方向へ貫通した略筒状のチップ本体と、該チップ本体内の前端側に収容されるとともに外周面前端側を該チップ本体から前方へ突出させた転写ボールと、チップ本体内における前記転写ボールよりも後方側に配置された弾発部材とを備え、チップ本体内の内向き環状突起に、その後方側から前記転写ボールの前半部側を接触させるとともに、前記転写ボールをその後方側から前記弾発部材により押圧するようにしたボールペンチップにおいて、前記弾発部材は、前記チップ本体の中心線方向へ延びるとともにその前端部を前記転写ボールの後端側に接触させたストレート部と、該ストレート部の後方に連なる小径コイルバネ部と、該小径コイルバネ部の後方に連なるとともに小径コイルバネ部よりも外径の大きい大径コイルバネ部とを一体に有し、チップ本体内には、前記転写ボールを回転自在に収容するボールハウスと、該ボールハウスの後方側に連通するとともに前記小径コイルバネ部の少なくとも一部を内在する小径孔と、該小径孔の後方側に連通するとともに前記大径コイルバネ部の少なくとも一部を内在する大径孔とが形成され、前記大径孔は、前記大径コイルバネ部の外径面に摺接して該大径コイルバネ部を軸方向へ案内するように形成されていることを特徴とする。
この構成によれば、弾発部材の大径コイルバネ部がチップ本体内で撓むのを大径孔によって抑制でき、ひいては、大径コイルバネ部の撓みに起因してストレート部が傾くのを防ぐことができる。よって、弾発部材の組込不良を低減することができる。
The first feature of the present embodiment is a substantially cylindrical chip main body which penetrates the inside in the front and rear direction, and is accommodated on the front end side in the chip main body and protrudes the front end side of the outer peripheral surface to the front And an elastic member disposed on the back side of the transfer ball in the chip body, and the inward annular protrusion in the chip body, the front side of the transfer ball from the rear side In the ballpoint pen tip in which the transfer ball is pressed by the resilient member from behind with the contact, the resilient member extends in the direction of the center line of the tip body and has its front end portion of the transfer ball. A straight portion brought into contact with the rear end side, a small diameter coil spring portion connected to the rear of the straight portion, and a rear portion connected to the rear of the small diameter coil spring portion A ball house which integrally has a large diameter coil spring portion having a large diameter, and which accommodates the transfer ball rotatably in the tip body, and communicates with the rear side of the ball house and at least one of the small diameter coil spring portions. And a large diameter hole communicating with the rear side of the small diameter hole and containing at least a part of the large diameter coil spring portion, wherein the large diameter hole is formed of the large diameter coil spring portion. It is characterized in that it is formed to be in sliding contact with the outer diameter surface and to guide the large diameter coil spring portion in the axial direction.
According to this configuration, bending of the large diameter coil spring portion of the resilient member in the tip body can be suppressed by the large diameter hole, and in turn, preventing the straight portion from tilting due to the bending of the large diameter coil spring portion. Can. Therefore, the incorporation failure of the resilient member can be reduced.
第二の特徴として、インクの流動性を良好にして筆記性能を向上するために、前記大径孔よりも後方側には、前記大径コイルバネ部の外径面との間に隙間を確保するように、前記大径孔よりも内径の大きい遊挿孔が連通している。 As a second feature, in order to improve the flowability of the ink and improve the writing performance, a gap is secured between the large diameter hole and the outer diameter surface of the large diameter coil spring portion on the rear side. As such, the loose insertion holes having a larger inside diameter than the large diameter holes are in communication.
第三の特徴として、ストレート部が傾くのをより効果的に抑制するために、前記小径孔は、前記小径コイルバネ部の外径面に摺接して該小径コイルバネ部を軸方向へ案内するように形成されている。 As a third feature, in order to more effectively suppress the straight portion from being inclined, the small diameter hole is in sliding contact with the outer diameter surface of the small diameter coil spring portion to guide the small diameter coil spring portion in the axial direction. It is formed.
第四の特徴として、小径コイルバネ部が大径コイルバネ部に対し傾くのを抑制するとともに、弾発部材がチップ本体内へスムーズに挿入されるようにする等のために、前記弾発部材は、前記小径コイルバネ部と前記大径コイルバネ部との間に、前記大径コイルバネ部の前端から前記小径コイルバネ部の後端にかけて徐々に外径を小さくしたテーパ状コイルバネ部を有し、該テーパ状コイルバネ部を前記大径孔内に配置している。 As a fourth feature, the resilient member is configured to prevent tilting of the small diameter coil spring portion with respect to the large diameter coil spring portion and to allow the resilient member to be smoothly inserted into the tip body, etc. A tapered coil spring portion having an outer diameter gradually reduced from the front end of the large diameter coil spring portion to the rear end of the small diameter coil spring portion between the small diameter coil spring portion and the large diameter coil spring portion The portion is disposed in the large diameter hole.
第五の特徴としては、前記ボールペンチップを具備して筆記具を構成した。 According to a fifth aspect, the writing instrument is configured by including the ballpoint pen tip.
次に、上記特徴を有する好ましい実施例を、図面に基づいて詳細に説明する。
なお、本明細書中、「前方」とは、ボールペンチップの先端方向を意味し、「後方」とは、その逆方向を意味する。また、「径外方向」とは、ボールペンチップの径方向において中心部から離れる方向を意味し、「径内方向」とは、その逆方向を意味する。
Next, a preferred embodiment having the above features will be described in detail based on the drawings.
In the present specification, “forward” means the tip direction of the ballpoint pen tip, and “backward” means the opposite direction. The “radially outward direction” means the direction away from the central portion in the radial direction of the ballpoint pen tip, and the “radially inward direction” means the opposite direction.
図１は、本発明に係るボールペンチップ１を示す。
ボールペンチップ１は、内部を前後方向へ貫通した略筒状のチップ本体１０と、該チップ本体１０内の前端側に収容されるとともに外周面前端側を該チップ本体１０から前方へ突出させた転写ボール２０と、チップ本体１０内における転写ボール２０よりも後方側に配置された弾発部材３０とを備え、チップ本体１０内の内向き環状突起１１ａに、その後方側から転写ボール２０の前半部側を接触させるとともに、転写ボール２０をその後方側から弾発部材３０により押圧するようにしている。
FIG. 1 shows a ballpoint pen tip 1 according to the present invention.
The ballpoint pen tip 1 has a substantially cylindrical tip body 10 penetrating the inside in the front-rear direction, and a transfer in which the front end side of the outer peripheral surface is protruded forward from the tip body 10 while being accommodated at the front end side in the tip body 10 The ball 20 and the resilient member 30 disposed on the back side of the transfer ball 20 in the chip body 10, the inward annular projection 11a in the chip body 10, the front half of the transfer ball 20 from the rear side While making the side contact, the transfer ball 20 is pressed by the resilient member 30 from the rear side.
チップ本体１０は、例えばステンレス、黄銅又は洋白などの合金から、先端側に先細円錐状の部分を有する略筒状に形成される。
このチップ本体１０内には、前端部側から順に、ボールハウス１１、括れ部１２、小径孔１３、大径孔１４、先窄み孔１５、遊挿孔１６が設けられ、これらの内部空間は前後方向へ連通している。
The tip body 10 is formed of, for example, an alloy such as stainless steel, brass, or nickel, in a substantially cylindrical shape having a tapered conical portion on the tip side.
In the chip body 10, a ball house 11, a constricted portion 12, a small diameter hole 13, a large diameter hole 14, a tapered hole 15, and a loose insertion hole 16 are provided in this order from the front end side. It communicates in the front-rear direction.
ボールハウス１１は、最前端寄りの内向き環状突起１１ａと、該内向き環状突起１１ａの基端から後方へ延びる円筒状内壁面１１ｂと、括れ部１２の前端面とによって、転写ボール２０を回転自在に収容する空間を構成している。 The ball house 11 rotates the transfer ball 20 by the inward annular projection 11a closer to the front end, the cylindrical inner wall surface 11b extending rearward from the base end of the inward annular projection 11a, and the front end face of the constriction portion 12 It constitutes a space that can be accommodated freely.
内向き環状突起１１ａは、ボールハウス１１内に転写ボール２０が挿入された後に、チップ本体１０の前端部が外部からカシメられることで形成され、円筒状内壁面１１ｂの前端側から径内方向へ突出するようにして、転写ボール２０の前半部に接触する。 The inward annular projection 11a is formed by caulking the front end portion of the tip body 10 from the outside after the transfer ball 20 is inserted into the ball house 11, and radially inward from the front end side of the cylindrical inner wall surface 11b. As it protrudes, it contacts the front half of the transfer ball 20.
また、括れ部１２は、円筒状内壁面１１ｂよりも後側の部分を、円筒状内壁面１１ｂよりも小さい内径に縮径することで、略括れ状（もしくは径内方向へ突出する環状突起状）に形成された部分である。この括れ部１２を貫通する孔の内周面は、略円筒状の面であり、該面には、前後方向へ貫通するインク誘導溝１２ａが形成される。インク誘導溝１２ａは、周方向に間隔を置いて複数設けられ、インク流通量を適正に確保するように、その流通断面積が設定されている。
そして、括れ部１２の後方側には、小径孔１３が設けられる。
Further, the constricted portion 12 reduces the diameter of the portion on the rear side of the cylindrical inner wall surface 11b to an inner diameter smaller than that of the cylindrical inner wall surface 11b, thereby forming an almost annular shape It is a part formed in. The inner peripheral surface of the hole passing through the constricted portion 12 is a substantially cylindrical surface, and an ink guiding groove 12a penetrating in the front-rear direction is formed on the surface. A plurality of ink guiding grooves 12a are provided at intervals in the circumferential direction, and the flow cross-sectional area thereof is set so as to appropriately secure the ink flow rate.
A small diameter hole 13 is provided on the rear side of the constricted portion 12.
小径孔１３は、括れ部１２中心の貫通孔に連通するとともに該貫通孔よりも内径の大きい円筒状の孔であり、後述する弾発部材３０におけるストレート部３１及び小径コイルバネ部３２の前部側を内在するとともに、小径コイルバネ部３２の外径面に摺接して該小径コイルバネ部３２を軸方向へ案内する。 The small diameter hole 13 is a cylindrical hole communicating with the through hole at the center of the constricted portion 12 and having a larger inner diameter than the through hole, and the front side of the straight portion 31 and the small diameter coil spring portion 32 in the elastic member 30 described later. Of the small diameter coil spring portion 32 so as to guide the small diameter coil spring portion 32 in the axial direction.
大径孔１４は、小径孔１３に連通するとともに、該小径孔１３よりも内径の大きい円筒状の孔である。この大径孔１４は、弾発部材３０におけるテーパ状コイルバネ部３３、及び大径コイルバネ部３４の前端側の部分を内在するとともに、大径コイルバネ部３４の前端側の外径面に摺接して該大径コイルバネ部３４を軸方向へ案内する。
この大径孔１４の前端側には、小径孔１３へ向かって内径を徐々に縮径するように、環状テーパ面１４ａが設けられる。
The large diameter hole 14 communicates with the small diameter hole 13 and is a cylindrical hole having a larger inside diameter than the small diameter hole 13. The large diameter hole 14 internally includes the tapered coil spring portion 33 in the resilient member 30 and the portion on the front end side of the large diameter coil spring portion 34 and is in sliding contact with the outer diameter surface on the front end side of the large diameter coil spring portion 34 The large diameter coil spring portion 34 is guided in the axial direction.
An annular tapered surface 14 a is provided on the front end side of the large diameter hole 14 so as to gradually reduce the inner diameter toward the small diameter hole 13.
先窄み孔１５は、前方へ向かって連続的に縮径された略円錐台状の孔であり、大径孔１４と遊挿孔１６の間でこれらを連通している。この先窄み孔１５は、弾発部材３０における大径コイルバネ部３４の前端寄りの部分を収容する。 The pre-bent hole 15 is a substantially truncated conical hole whose diameter is continuously reduced toward the front, and the large diameter hole 14 and the loose insertion hole 16 communicate with each other. The pre-bore 15 accommodates a portion of the resilient member 30 near the front end of the large diameter coil spring portion 34.
遊挿孔１６は、大径孔１４よりも内径の大きい円筒状に形成され、先窄み孔１５の後方に同芯状に連通している。
先窄み孔１５及び遊挿孔１６の内周面は、弾発部材３０における大径コイルバネ部３４の外径面との間に隙間を確保している。
The loose insertion hole 16 is formed in a cylindrical shape having a larger inner diameter than the large diameter hole 14, and concentrically communicates with the rear of the end narrowing hole 15.
The inner peripheral surface of the pre-bent hole 15 and the loose insertion hole 16 secures a gap with the outer diameter surface of the large diameter coil spring portion 34 in the resilient member 30.
また、弾発部材３０は、例えばステンレス等の硬質金属材料から略コイル状に形成されたバネであり、ストレート部３１と、小径コイルバネ部３２と、テーパ状コイルバネ部３３と、大径コイルバネ部３４と、座巻部３５とから一体に構成される。 Further, the resilient member 30 is a spring formed in a substantially coil shape, for example, from a hard metal material such as stainless steel, and the straight portion 31, the small diameter coil spring portion 32, the tapered coil spring portion 33, and the large diameter coil spring portion 34. And the end-winding portion 35 integrally.
ストレート部３１は、チップ本体１０の中心線に沿うように配置される直線状の部分である。このストレート部３１は、小径孔１３内の前端側から括れ部１２内にかけて挿通され、その前端部を、転写ボール２０の後半部側の面に当接させている。 The straight portion 31 is a linear portion disposed along the center line of the chip body 10. The straight portion 31 is inserted from the front end side in the small diameter hole 13 to the inside of the constricted portion 12, and the front end portion is in contact with the surface on the rear half side of the transfer ball 20.
小径コイルバネ部３２は、ストレート部３１の後側にコイルバネ状に設けられる。この小径コイルバネ部３２は、ストレート部３１からの押圧力により若干収縮するが、その収縮量が大径コイルバネ部３４の収縮量よりも小さくなるように設定される。また、この小径コイルバネ部３２において、前後の線材の隙間はインクの流通性を向上する。
この小径コイルバネ部３２の外径面は、小径孔１３の内径よりも僅かに小さい外径に形成される。
したがって、製造過程において弾発部材３０がチップ本体１０に対し後方側から挿入される際や、転写ボール２０の進退に伴って弾発部材３０が伸縮する際、小径コイルバネ部３２の外径面は、小径孔１３の内周面に摺接して前後方向へ案内される。
The small diameter coil spring portion 32 is provided on the rear side of the straight portion 31 in a coil spring shape. The small diameter coil spring portion 32 is slightly contracted by the pressing force from the straight portion 31, but the contraction amount is set to be smaller than the contraction amount of the large diameter coil spring portion 34. Further, in the small diameter coil spring portion 32, the gap between the front and rear wires improves the flowability of the ink.
The outer diameter surface of the small diameter coil spring portion 32 is formed to have an outer diameter slightly smaller than the inner diameter of the small diameter hole 13.
Therefore, when the resilient member 30 is inserted from the rear side to the chip main body 10 in the manufacturing process, or when the resilient member 30 expands and contracts as the transfer ball 20 advances and retracts, the outer diameter surface of the small diameter coil spring portion 32 The inner peripheral surface of the small diameter hole 13 is in sliding contact and guided in the front-rear direction.
テーパ状コイルバネ部３３は、大径コイルバネ部３４の前端から小径コイルバネ部３２の後端にかけて徐々に外径を小さくしたコイル状に形成され、大径孔１４内に配置される。
このテーパ状コイルバネ部３３は、前後の環状部分を接触させた全密着状に構成され、ほとんど収縮しない。
The tapered coil spring portion 33 is formed in a coil shape whose outer diameter is gradually reduced from the front end of the large diameter coil spring portion 34 to the rear end of the small diameter coil spring portion 32 and is disposed in the large diameter hole 14.
The tapered coil spring portion 33 is configured in a close contact manner in which the front and rear annular portions are in contact with each other, and hardly shrinks.
大径コイルバネ部３４は、テーパ状コイルバネ部３３の後側にコイルバネ状に設けられ、前方からの押圧力により収縮し、該押圧力が除去されると復元するように構成される。この大径コイルバネ部３４の外径面は、大径孔１４の内径よりも僅かに小さく、且つ遊挿孔１６の内周面との間に隙間ｓ２を有する外径に形成される。
したがって、製造過程において弾発部材３０がチップ本体１０に対し後方側から挿入される際や、転写ボール２０の進退に伴って弾発部材３０が伸縮する際、大径コイルバネ部３４の前端側の外径面は、大径孔１４の内周面に摺接して前後方向へ案内される。
The large diameter coil spring portion 34 is provided in the shape of a coil spring on the rear side of the tapered coil spring portion 33, and is configured to contract by a pressing force from the front and restore when the pressing force is removed. The outer diameter surface of the large diameter coil spring portion 34 is formed to have an outer diameter slightly smaller than the inner diameter of the large diameter hole 14 and having a gap s2 with the inner peripheral surface of the loose insertion hole 16.
Therefore, when the resilient member 30 is inserted from the rear side to the chip main body 10 in the manufacturing process, or when the resilient member 30 expands and contracts with the movement of the transfer ball 20, the large diameter coil spring portion 34 is The outer diameter surface is in sliding contact with the inner peripheral surface of the large diameter hole 14 and guided in the front-rear direction.
座巻部３５は、大径コイルバネ部３４の後側に全密着コイル状に設けられる。この座巻部３５の外径面は、遊挿孔１６の内周面に近接又は接触する。そして、座巻部３５の後端部は、チップ本体１０内のカシメ突起１７によって後方側から受けられる。 The end winding portion 35 is provided on the rear side of the large diameter coil spring portion 34 in the form of a full contact coil. The outer diameter surface of the end winding portion 35 approaches or contacts the inner peripheral surface of the play insertion hole 16. The rear end portion of the wound portion 35 is received from the rear side by the caulking projection 17 in the tip body 10.
カシメ突起１７は、チップ本体１０の後端側を外周側からカシメることで、チップ本体１０の内周面を部分的に突出させた突起であり、周方向に間隔を置いて複数設けられる。 The caulking projections 17 are projections in which the inner peripheral surface of the chip body 10 is partially protruded by caulking the rear end side of the chip body 10 from the outer peripheral side, and a plurality of caulking projections 17 are provided at intervals in the circumferential direction.
そして、上記構成のボールペンチップ１は、例えば、図４に示すように、筆記具１００の筆記部として用いられる。
筆記具１００は、ノック部１４０の押圧操作によりボールペンリフィール１２０前端のボールペンチップ１を軸筒１１０前端から突出させ、この突出状態を、クリップ１１１を軸筒中心側へ撓ませる操作により解除するようにした出没式のボールペンてある。
ボールペンリフィール１２０は、インク収容管１２１の前端にボールペンチップ１を接続し、これらの内部にインクを充填してなる。
And the ball-point pen tip 1 of the said structure is used as a writing part of the writing instrument 100, as shown, for example in FIG.
The writing instrument 100 causes the ballpoint pen tip 1 at the front end of the ballpoint pen refill 120 to protrude from the front end of the barrel 110 by pressing the knock portion 140 and releases this projecting state by an operation to bend the clip 111 toward the barrel center. It has a haunting ballpoint pen.
The ballpoint pen refill 120 is formed by connecting the ballpoint pen tip 1 to the front end of the ink storage tube 121 and filling the inside with ink.
次に、上記ボールペンチップ１の製造工程上の特徴および作用効果について説明する。
先ず、弾発部材３０をチップ本体１０内へ挿入する際、弾発部材３０の前端側の小径コイルバネ部３２及びストレート部３１が、組立時の振動等により撓んだり曲がったりするのを、全密着状のテーパ状コイルバネ部３３の剛性によって抑制することができる。
Next, features and effects of the manufacturing process of the ballpoint pen tip 1 will be described.
First, when the resilient member 30 is inserted into the chip body 10, the small diameter coil spring portion 32 and the straight portion 31 on the front end side of the resilient member 30 are all bent or bent due to vibration at the time of assembly. This can be suppressed by the rigidity of the closely-contacted tapered coil spring portion 33.
そして、弾発部材３０をチップ本体１０内へ挿入する過程においては、小径コイルバネ部３２が、小径孔１３の内壁面に摺接しながら該小径孔１３内に進入し、これに伴い、テーパ状コイルバネ部３３が、先窄み孔１５に導かれて大径孔１４に進入し、そして、大径コイルバネ部３４の前端側の部分が、テーパ状コイルバネ部３３に続いて大径孔１４内に進入するとともに大径孔１４の内壁面に摺接する。 Then, in the process of inserting the resilient member 30 into the chip main body 10, the small diameter coil spring portion 32 enters the small diameter hole 13 while slidingly contacting the inner wall surface of the small diameter hole 13, and along with this, the tapered coil spring The portion 33 is guided to the tapered hole 15 and enters the large diameter hole 14, and then the portion on the front end side of the large diameter coil spring portion 34 enters the large diameter hole 14 following the tapered coil spring portion 33. And slide on the inner wall surface of the large diameter hole 14.
したがって、例えば、弾発部材３０の前端側が多少撓む等してストレート部３１の前端部が中心部に対し位置ずれしていた場合であっても、ストレート部３１前端の前記位置ずれを、前記挿入の際に矯正し、ストレート部３１の前端を転写ボール２０の後半部の略中心に当接させることができる。 Therefore, for example, even when the front end portion of the elastic member 30 is slightly bent or the like so that the front end portion of the straight portion 31 is displaced with respect to the central portion, the displacement of the front end of the straight portion 31 The front end of the straight portion 31 can be brought into contact with the approximate center of the rear half portion of the transfer ball 20 by correcting at the time of insertion.
次に、ストレート部３１が転写ボール２０に当接した後、弾発部材３０の後端側が治具等により前方へ押圧され、弾発部材３０全体が弾性的に収縮し、この収縮状態を維持したまま、カシメ突起１７が形成される。
前記のように弾発部材３０が後方からの押圧力を受けた際、弾発部材３０全体には側面視略弓状あるいは側面視略Ｓ字状に撓もうとする力が作用するが、本実施例のボールペンチップ１によれば、このような撓みを、小径コイルバネ部３２と小径孔１３との接触、及び大径コイルバネ部３４前端側と大径孔１４との接触、テーパ状コイルバネ部３３の剛性等、これらの相乗効果によって抑制することができる。
Next, after the straight portion 31 abuts on the transfer ball 20, the rear end side of the resilient member 30 is pushed forward by a jig or the like, and the entire resilient member 30 is elastically contracted, maintaining this contracted state In the same manner, the crimped projection 17 is formed.
As described above, when the resilient member 30 receives a pressing force from the rear, a force is applied to the entire resilient member 30 so as to bend in a substantially arcuate shape in a side view or a substantially S shape in a side view. According to the ballpoint pen tip 1 of the embodiment, such bending is caused by the contact between the small diameter coil spring portion 32 and the small diameter hole 13, the contact between the front end side of the large diameter coil spring portion 34 and the large diameter hole 14, a tapered coil spring portion 33 The rigidity of these, etc. can be suppressed by these synergistic effects.
よって、本実施例のボールペンチップ１によれば、ストレート部３１の前端部が転写ボール２０の後半部に当接せずに、チップ内の微小な凹凸やインク誘導溝１２ａ等にひっかかって、組込不良を生じるようなことを防ぐことができる。 Therefore, according to the ballpoint pen tip 1 of the present embodiment, the front end of the straight portion 31 is not in contact with the rear half of the transfer ball 20, but is caught on the minute unevenness in the tip or the ink guide groove 12a. It is possible to prevent the occurrence of a package failure.
また、本実施例のボールペンチップ１によれば、大径孔１４内周面と、テーパ状コイルバネ部３３及び小径コイルバネ部３２後端側との間に隙間ｓ１を有し、さらに、先窄み孔１５から遊挿孔１６にわたる内周面と、大径コイルバネ部３４との間に隙間ｓ２を有するが、これらの隙間ｓ１，ｓ２は、弾発部材３０の伸縮動作性を向上したり、インクの流動性を向上するとともに筆記時等にボールペンチップ１先端からチップ本体１０内に侵入した気泡を後方へ逃す通路として機能したりする。 Further, according to the ballpoint pen tip 1 of the present embodiment, there is a gap s1 between the inner peripheral surface of the large diameter hole 14 and the rear end side of the tapered coil spring portion 33 and the small diameter coil spring portion 32. There is a gap s2 between the inner circumferential surface from the hole 15 to the loose insertion hole 16 and the large diameter coil spring portion 34. These gaps s1 and s2 improve the stretchability of the resilient member 30, or the ink It functions as a passage for releasing air bubbles invading into the tip body 10 from the tip of the ballpoint pen tip 1 at the time of writing or the like.
なお、上記実施例によれば、特に好ましい一例として弾発部材３０にテーパ状コイルバネ部３３を設けたが、他例としては、弾発部材３０からテーパ状コイルバネ部３３を省き、小径コイルバネ部３２の後端に、直接、大径コイルバネ部３４を接続した態様とすることも可能である。 According to the above embodiment, the tapered coil spring portion 33 is provided on the resilient member 30 as a particularly preferable example, but as another example, the tapered coil spring portion 33 is omitted from the resilient member 30 and the small diameter coil spring portion 32 It is also possible to directly connect the large diameter coil spring portion 34 to the rear end of the case.
また、上記実施例によれば、弾発部材３０の伸縮性を良好にする好ましい一例として、遊挿孔１６内壁面と弾発部材３０との間に隙間ｓ２を設けたが、他例としては、隙間ｓ２を省いて、弾発部材３０の後部側を遊挿孔１６内壁面に摺接させる態様とすることも可能である。 Further, according to the above embodiment, the gap s2 is provided between the inner wall surface of the free insertion hole 16 and the resilient member 30 as a preferable example for improving the stretchability of the resilient member 30, but as another example Alternatively, the gap s2 may be omitted, and the rear side of the resilient member 30 may be in sliding contact with the inner wall surface of the play hole 16.
また、上記実施例によれば、特に好ましい態様として、小径コイルバネ部３２を小径孔１３に摺接し、且つ大径コイルバネ部３４前端側を大径孔１４に摺接するようにしたが、他例としては、小径コイルバネ部３２と小径孔１３の間に気泡を逃がすための隙間を設け、大径コイルバネ部３４前端側のみを大径孔１４に摺接する態様とすることも可能である。 Further, according to the above embodiment, the small diameter coil spring portion 32 is in sliding contact with the small diameter hole 13 and the front end side of the large diameter coil spring portion 34 is in sliding contact with the large diameter hole 14 as a particularly preferable embodiment. Alternatively, a gap may be provided between the small diameter coil spring portion 32 and the small diameter hole 13 for releasing air bubbles, and only the front end side of the large diameter coil spring portion 34 may be in sliding contact with the large diameter hole 14.
また、図示例によれば、ボールペンチップ１を具備した筆記具１００の一例として単色のボールペンを構成したが、筆記具１００の他例としては、複数色のボールペンリフィールを具備した多色筆記具や、ボールペンリフィールやシャープペンリフィール等の複数種類のリフィールを具備した多機能筆記具を構成することも可能である。 Further, according to the illustrated example, a single-color ballpoint pen is configured as an example of the writing instrument 100 equipped with the ballpoint pen tip 1, but as another example of the writing instrument 100, a multicolor writing instrument having a plurality of ballpoint pen refills, and a ballpoint pen refill It is also possible to construct a multi-functional writing instrument equipped with a plurality of types of refills such as and mechanical pencil refills.
１：ボールペンチップ
１０：チップ本体
１２：括れ部
１３：小径孔
１４：大径孔
１５：先窄み孔
１６：遊挿孔
１１：ボールハウス
１１ａ：内向き環状突起
２０：転写ボール
３０：弾発部材
３１：ストレート部
３２：小径コイルバネ部
３３：テーパ状コイルバネ部
３４：大径コイルバネ部
1: Ball-point pen tip 10: Tip body 12: Bore 13: Small diameter hole 14: Large diameter hole 15: Pointed hole 16: Free insertion hole 11: Ball house 11a: Inward annular projection 20: Transfer ball 30: Bounce Member 31: straight portion 32: small diameter coil spring portion 33: tapered coil spring portion 34: large diameter coil spring portion
Claims (4)
前記弾発部材は、前記チップ本体の中心線方向へ延びるとともにその前端部を前記転写ボールの後端側に接触させたストレート部と、該ストレート部の後方に連なる小径コイルバネ部と、該小径コイルバネ部の後方に連なるとともに小径コイルバネ部よりも外径の大きい大径コイルバネ部とを一体に有し、
チップ本体内には、前記転写ボールを回転自在に収容するボールハウスと、該ボールハウスの後方側に連通するとともに前記小径コイルバネ部の少なくとも一部を内在する小径孔と、該小径孔の後方側に連通するとともに前記大径コイルバネ部の少なくとも一部を内在する大径孔とが形成され、
前記大径孔は、前記大径コイルバネ部の外径面に摺接して該大径コイルバネ部を軸方向へ案内するように形成され、
前記大径孔よりも後方側には、前記大径コイルバネ部の外径面との間に隙間を確保するように、前記大径孔よりも内径の大きい遊挿孔が連通していることを特徴とするボールペンチップ。 A substantially cylindrical chip main body which penetrates the inside in the front and rear direction, a transfer ball housed on the front end side in the chip main body and having the outer peripheral surface front end side protruded forward from the chip main body, And a resilient member disposed on the rear side relative to the transfer ball, the front side of the transfer ball being in contact with the inward annular projection in the tip body from the rear side, and the transfer ball on the rear side In the ballpoint pen tip pressed by the resilient member from
The resilient member extends in the direction of the center line of the tip body and has a straight portion whose front end is in contact with the rear end side of the transfer ball, a small diameter coil spring portion connected to the rear of the straight portion, and a small diameter coil spring And integrally with a large diameter coil spring portion having a larger outer diameter than the small diameter coil spring portion
In the chip main body, a ball house rotatably accommodating the transfer ball, a small diameter hole communicating with the rear side of the ball housing and including at least a part of the small diameter coil spring portion, and a rear side of the small diameter hole And a large diameter hole communicating with the inner diameter of the large diameter coil spring portion,
The large diameter hole is formed in sliding contact with the outer diameter surface of the large diameter coil spring portion to guide the large diameter coil spring portion in the axial direction .
A loose insertion hole having a larger inner diameter than the large diameter hole is communicated with the large diameter hole on the rear side so as to secure a gap between the large diameter hole and the outer diameter surface of the large diameter coil spring portion. Features a ballpoint pen tip.
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| JP2015039570A JP6512631B2 (en) | 2015-02-27 | 2015-02-27 | Ballpoint pen tip and writing instrument equipped with the same |
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| JPH08164695A (en) * | 1994-12-14 | 1996-06-25 | Mitsubishi Pencil Co Ltd | Coating applicator |
| TW490401B (en) * | 1998-08-21 | 2002-06-11 | Pilot Kk | Retractable type ballpoint pen |
| JP3770592B2 (en) * | 2001-09-28 | 2006-04-26 | 株式会社パイロットコーポレーション | Nib structure with ball as writing medium |
| JP4420451B2 (en) * | 2004-06-28 | 2010-02-24 | 株式会社サクラクレパス | Applicator |
| JP5329296B2 (en) * | 2009-04-30 | 2013-10-30 | パイロットインキ株式会社 | Ballpoint pen and ballpoint pen manufacturing method |
| CN201824677U (en) * | 2010-08-18 | 2011-05-11 | 青岛昌隆文具有限公司 | Needle-tube spring pen head |
| JP6189054B2 (en) * | 2013-02-28 | 2017-08-30 | ゼブラ株式会社 | Ballpoint pen tip and ballpoint pen |
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