JP4285745B2 - Earhead - Google Patents

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JP4285745B2
JP4285745B2 JP2004023087A JP2004023087A JP4285745B2 JP 4285745 B2 JP4285745 B2 JP 4285745B2 JP 2004023087 A JP2004023087 A JP 2004023087A JP 2004023087 A JP2004023087 A JP 2004023087A JP 4285745 B2 JP4285745 B2 JP 4285745B2
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resin
core material
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tip
bubbles
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JP2005210986A (en
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武則 大津
好尚 加藤
秀行 内藤
哲男 阿久津
勝広 及川
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ダイワ精工株式会社
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Description

本発明は超弾性合金を使用した穂先竿に関する。従って、黒鯛等を対象魚とする、所謂、イカダ竿に適用できる。 The present invention relates to a top rod using superelastic alloy. Therefore, the present invention can be applied to so-called squid trout that uses black sea bream as a target fish.

釣用イカダに乗って黒鯛等を釣るイカダ竿は、短くて軽量に構成されており、長さも例えば1.3〜2.1m程度である。また、穂先部は繊細に反応するように特に細く形成されている。こうしたイカダ竿用穂先竿を含めて、繊維強化樹脂製竿杆の製造においては、プリプレグシートに圧力を与えつつ作業台の上で芯金や芯材を転動(ローリング)させてプリプレグシートを巻回させる。その後、緊締テープ等の緊締手段により巻回シートの外側から圧力を与えつつ加熱焼成する。この緊締手段による圧力によって、加熱された巻回シートの含浸樹脂をフローさせ、ローリング中に入った気泡を外に追い出し、強度の安定した高品質の竿杆を製造している。また、下記特許文献1には、超弾性合金芯材の外側に、低弾性素材や高伸び率素材の繊維強化樹脂の層を設け、芯材と繊維強化樹脂層との間で伸び率を近似させて界面剥離を防止し、長期に亘り、大撓み変形を可能にさせる釣竿が開示されている。
特開2001−37378号公報
An squid rod that catches a black shark on a fishing squid is configured to be short and lightweight, and the length is, for example, about 1.3 to 2.1 m. Further, the tip portion is particularly thin so as to react delicately. In the manufacture of fiber reinforced resin cocoons, including these squid head tips, roll the prepreg sheet by rolling (rolling) the core metal or core material on the work table while applying pressure to the prepreg sheet. Let it turn. Then, it heat-fires, applying pressure from the outer side of a winding sheet with fastening means, such as a fastening tape. The impregnating resin of the heated wound sheet is caused to flow by the pressure of the tightening means, and the bubbles that have entered the rolling are driven out to produce a high-quality bag with stable strength. Further, in Patent Document 1 below, a fiber reinforced resin layer of a low elastic material or a high elongation material is provided outside the superelastic alloy core material, and the elongation rate is approximated between the core material and the fiber reinforced resin layer. Thus, a fishing rod is disclosed that prevents interfacial peeling and enables large deflection deformation over a long period of time.
JP 2001-37378 A

然しながら、特に穂先竿等の細い竿杆を製造する場合に、気泡侵入を避けようとしてプリプレグシートや緊締テープの張力を大きくすると、その力によって竿杆素材が曲ったり、焼成前には曲りが目立たなくても、加熱焼成の際中に内部応力によって曲りが生じ、曲った竿杆が製造されるという問題がある。曲った竿杆は不良品となり、歩留りが低下する。
解決しようとする課題は、曲りが少ないと共に強度的に安定した高品質のイカダ竿用穂先竿を提供することである。
However, especially when manufacturing thin cocoons such as pointed cocoons, if the tension of the prepreg sheet or the fastening tape is increased to avoid air bubble intrusion, the cocoon material is bent by the force, and the bending is noticeable before firing. Even if not, there is a problem that bending occurs due to internal stress during heating and baking, and a bent ridge is produced. Bent heels become defective and yield decreases.
The problem to be solved is to provide a high quality squid rice bran with less bending and stable strength.

本発明は請求項1では、超弾性合金を芯材とし、該芯材の先部領域を除く外側に繊維強化樹脂製の外側層を設け、該外側層と芯材との間に設けられると共に芯材外周に接するように前記外側層よりも樹脂比率の大きな樹脂リッチ層を設けた穂先竿であって、芯材を除く繊維強化樹脂領域には気泡が多数分散していることを特徴とする穂先を提供する。
超弾性合金とは、5〜8%等、3%以上の伸び率を有する合金であり、Ni−Ti系合金、Ni−Ti−Fe系合金、Ni−Ti−Cu系合金、Ni−Ti−Cr系合金等がある。
また、本願での穂先竿とは、釣竿が1本竿の場合は、穂先竿が1本竿そのものである。
前記気泡の多くは穂先竿の長手方向に長い形態の場合が多い。
According to a first aspect of the present invention, a superelastic alloy is used as a core material, and an outer layer made of a fiber reinforced resin is provided on the outer side excluding the front region of the core material, and the outer layer is provided between the outer layer and the core material. A spike tip provided with a resin-rich layer having a resin ratio larger than that of the outer layer so as to be in contact with the outer periphery of the core material, wherein many bubbles are dispersed in the fiber-reinforced resin region excluding the core material Provide the tip.
The superelastic alloy is an alloy having an elongation of 3% or more, such as 5 to 8%, Ni-Ti alloy, Ni-Ti-Fe alloy, Ni-Ti-Cu alloy, Ni-Ti- There are Cr-based alloys and the like.
In addition, in this application, when the fishing rod is a single rod, the tip rod is a single rod itself.
Many of the bubbles are often long in the longitudinal direction of the tip.

請求項3では、前記樹脂リッチ層は、樹脂比率が99重量%以上(実質的に樹脂のみ)であり、請求項4では、径方向外側領域がガラス繊維によって強化された繊維強化樹脂領域であり、芯材側領域は樹脂比率が99重量%以上(実質的に樹脂のみ)である形態を提供する。
請求項5では、前記樹脂リッチ層を設けた芯材領域は、ストレートか又は3/1000以下のテーパ率である請求項1〜4の何れか1記載の穂先竿を提供する。
In claim 3, the resin-rich layer has a resin ratio of 99% by weight or more (substantially only resin), and in claim 4, the radially outer region is a fiber-reinforced resin region reinforced with glass fibers. The core material side region provides a form in which the resin ratio is 99% by weight or more (substantially only the resin).
In Claim 5, the core material area | region which provided the said resin rich layer is a straight or the taper rate of 3/1000 or less, The tip spikelet of any one of Claims 1-4 is provided.

その他、超弾性合金製芯材の長さ方向の所定領域の外側にプリプレグシートを巻回した層の外側から、ポリプロピレン製テープを、その引張り応力が6.6kgf/mm(64.7N/mm)以下となる張力で緊締して加圧加熱により穂先竿を製造できる。 In addition , from the outside of the layer in which the prepreg sheet is wound outside the predetermined region in the length direction of the superelastic alloy core material, the tensile stress of the polypropylene tape is 6.6 kgf / mm 2 (64.7 N / mm). 2 ) A spikelet can be produced by tightening with the following tension and pressurizing and heating .

本発明の請求項1では、繊維強化樹脂領域には気泡が多数分散しているのであり、こうした気泡を残している。即ち、成形品に多数の気泡が残っているということは、緊締手段による緊締力を小さくして穂先竿素材の曲りを防止しつつ、気泡の追い出しを積極的には行わないで作られている。この緊締圧力の小さいことは、加熱焼成時の樹脂と気泡の移動が少なく、巻回したシートの強化繊維の指向方向を乱し難く、その結果、穂先竿の強度低下が防止できる。本願では気泡が存在しているが、芯材が合金、即ち、金属製であるため、強化繊維製の中実竿杆と同様に潰れ等にも強く、管状竿杆の場合のようには竿強度に与える気泡の影響が大きくはない。また、気泡の存在により、加熱焼成時に穂先竿素材の内部応力を緩和でき、穂先竿の曲りとなって現われることを防止できる。以上により、強度が安定すると共に曲りが少ない。更には、超弾性合金を芯材とし、樹脂リッチ層を介して繊維強化樹脂製の外側層を設けているため、大撓みをした場合、芯材と外側層との伸びの相違に基づく境界剥離が、大きな伸びの可能な樹脂リッチ層の存在により防止でき、更に強度の安定した穂先竿が提供できる。   In claim 1 of the present invention, many bubbles are dispersed in the fiber reinforced resin region, and such bubbles remain. In other words, the fact that a large number of bubbles remain in the molded product is made without actively expelling the bubbles while reducing the tightening force by the tightening means to prevent the curling of the heel material. . This small tightening pressure reduces the movement of the resin and bubbles during heating and baking, and hardly disturbs the orientation direction of the reinforcing fibers of the wound sheet. As a result, it is possible to prevent a reduction in the strength of the tip. Although air bubbles are present in the present application, since the core is made of an alloy, that is, metal, it is resistant to crushing in the same manner as a solid fiber made of reinforcing fiber. The effect of bubbles on strength is not great. In addition, the presence of bubbles can relieve the internal stress of the spikelet material at the time of heating and firing, and prevent the spikelet from appearing as a bend. As described above, strength is stabilized and bending is small. Furthermore, since the outer layer made of fiber reinforced resin is provided through the resin rich layer with the superelastic alloy as the core material, boundary peeling based on the difference in elongation between the core material and the outer layer when subjected to large deflection However, it can be prevented by the presence of a resin-rich layer capable of large elongation, and can further provide a spike with a stable strength.

樹脂リッチ層は、実質的に樹脂のみの層としてもよく、また、実質的に樹脂のみの領域の外側に、樹脂を伸び率の大きな繊維であるガラス繊維によって強化した領域を隣接させて形成してもよい。
請求項5では、超弾性合金の芯材を転動させて、この外側に樹脂リッチ層を設けたり、外側層を設けたりのためにシートを巻回させるが、この領域がストレートか又は3/1000以下のテーパ率であるため、転動時に、芯材の長手方向一端が他端に対して作業台の面内において回転することが防止できる。即ち、プリプレグシートを直線的に巻回できる。従って、シートの撚れ等の発生が防止され、強化繊維の指向方向が揃い、剛性的にも強度的にも安定し、高品質の穂先竿が提供できる。
The resin-rich layer may be a substantially resin-only layer, and is formed by adjoining a region in which the resin is reinforced with glass fibers, which are fibers having a high elongation rate, on the outside of the substantially resin-only region. May be.
In claim 5, the core material of the superelastic alloy is rolled and the sheet is wound to provide a resin-rich layer on the outside or to provide an outside layer. Since the taper ratio is 1000 or less, it is possible to prevent the longitudinal end of the core member from rotating in the plane of the work table with respect to the other end during rolling. That is, the prepreg sheet can be wound linearly. Accordingly, the occurrence of twisting of the sheet is prevented, the direction of the reinforcing fibers is aligned, the rigidity and the strength are stable, and a high quality scissors can be provided.

製法では、緊締テープに対して、引張り応力が6.6kgf/mm(64.7N/mm)以下となる張力しか付与せず、しかも、ポリプロピレン製であるため熱収縮を引き起こさない。従って、緊締テープによる巻回シートへの圧力を小さくできて穂先竿素材の曲りを防止できると共に、素材中に存在している気泡を追い出さずに存置できるため、加熱焼成時に発生する穂先竿素材内応力を気泡によって緩和する作用を持たせることができ、その結果、穂先竿の成形曲りが防止できる。また、緊締圧力が上記の程度であるため、樹脂と気泡の移動が少なくて強化繊維の配向乱れを防止でき、穂先竿の強度を維持安定化できる。なお、気泡は存在しているが、芯材が合金、即ち、金属製であり、気泡は無く、強化繊維製の中実竿杆と同様に潰れ等にも強く、管状竿杆の場合のようには竿強度に与える気泡の悪影響は大きくない In the manufacturing method, only a tension with a tensile stress of 6.6 kgf / mm 2 (64.7 N / mm 2 ) or less is applied to the fastening tape, and heat shrinkage is not caused because it is made of polypropylene. Therefore, it is possible to reduce the pressure applied to the wound sheet by the fastening tape and prevent the curl of the scissors material from being bent, and it is possible to leave the material without expelling the bubbles present in the material. The effect of relieving the stress by the bubbles can be provided, and as a result, the bending of the tip of the tip can be prevented. In addition, since the tightening pressure is in the above-described range, the movement of the resin and bubbles is small, so that the orientation disorder of the reinforcing fibers can be prevented, and the strength of the spikelet can be maintained and stabilized. Although air bubbles are present, the core is made of an alloy, that is, metal, there are no air bubbles, and it is strong against crushing as in the case of a solid fiber made of reinforcing fiber. There is no significant adverse effect of bubbles on the strength .

以下、本発明を図面を用いて詳細に説明する。
図1は、本発明に係る穂先竿の製法を説明する図である。既述の超弾性合金例の内、Ni−Ti系合金からなる中実の芯材10は、この例では長さLが530mmであり、その先部領域Aは先細テーパであって、この例の先端の直径は0.3mm程であり、繊細さを出すためには一般に0.2〜0.3mmの範囲が好ましい。その残りの後部領域Bはストレートであり、直径D1が1.1mm程である。この後部領域Bのほぼ全長に亘る長さの長方形の樹脂シート12と、これと同じサイズのガラス繊維織布のプリプレグシート14とを重ねて一緒に巻回する。樹脂シートの樹脂はシート14や後述のシート16に使用の樹脂と同じエポキシ樹脂である。樹脂シート12の厚さは13ミクロン、プリプレグシート14の厚さは17ミクロン程であり、2プライを超えないようにするため、1.7プライを設計値として巻回する。この例でのガラス繊維の指向方向は芯材の長手方向と円周方向であるが、±45度方向に指向させる等でもよい。また、芯材に対して樹脂シート12を単独で巻回することが難しいため、プリプレグシート14を重合させている。プリプレグシート14の樹脂比率は26重量%である。
Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram for explaining a method for producing a spikelet according to the present invention. Of the above-described superelastic alloy examples, the solid core material 10 made of a Ni—Ti alloy has a length L of 530 mm in this example, and its tip region A has a tapered taper. The tip has a diameter of about 0.3 mm, and a range of 0.2 to 0.3 mm is generally preferable in order to bring out a fineness. The remaining rear region B is straight and the diameter D1 is about 1.1 mm. A rectangular resin sheet 12 having almost the entire length of the rear region B and a prepreg sheet 14 of a glass fiber woven fabric of the same size are overlapped and wound together. The resin of the resin sheet is the same epoxy resin as that used for the sheet 14 and the sheet 16 described later. The resin sheet 12 has a thickness of 13 microns, and the prepreg sheet 14 has a thickness of about 17 microns. In order not to exceed 2 plies, 1.7 plies are wound as a design value. The orientation direction of the glass fiber in this example is the longitudinal direction and the circumferential direction of the core material, but it may be oriented in the direction of ± 45 degrees. Moreover, since it is difficult to wind the resin sheet 12 around the core material alone, the prepreg sheet 14 is polymerized. The resin ratio of the prepreg sheet 14 is 26% by weight.

その外側には、樹脂シート12の先端位置よりも幾分後ろ位置(10mm程後方位置)から芯材の後端までに亘る図示の台形状のガラス繊維織布のプリプレグシート16を巻回する。このプリプレグシートの樹脂比率は32重量%であり、プリプレグシートの厚さは60ミクロン程であり、この例では12回巻回する。こうして芯材の上に繊維強化樹脂素材を設けた上から、図示しないポリプロピレン製緊締テープを、その引張り応力が6.6kgf/mm(64.7N/mm)以下となる張力、この例では、5.3kgf/mm(51.9N/mm)の張力で緊締する。具体的には、厚さ25ミクロン、幅6mmのテープであり、張力を0.8kgf(7.8N)とする。この後、加熱して穂先竿を焼成する。その結果、後端部の直径D2が2.5mm程度の穂先竿が製造される。このように、緊締手段での圧力を低くしているため、芯材に隣接した樹脂シートによる樹脂層を保持できる。 A trapezoidal glass fiber woven prepreg sheet 16 is wound around the outer side of the resin sheet 12 from a position slightly rearward (about 10 mm rearward) to the rear end of the core material. The resin ratio of this prepreg sheet is 32% by weight, and the thickness of the prepreg sheet is about 60 microns. In this example, the prepreg sheet is wound 12 times. After providing the fiber reinforced resin material on the core material in this way, a tension tape whose tensile stress is 6.6 kgf / mm 2 (64.7 N / mm 2 ) or less is applied to a polypropylene fastening tape (not shown) in this example, Tighten with a tension of 5.3 kgf / mm 2 (51.9 N / mm 2 ). Specifically, the tape has a thickness of 25 microns and a width of 6 mm, and the tension is 0.8 kgf (7.8 N). Thereafter, the tip is fired by heating. As a result, a spikelet having a rear end diameter D2 of about 2.5 mm is manufactured. Thus, since the pressure in the tightening means is lowered, the resin layer by the resin sheet adjacent to the core material can be held.

その穂先竿の横断面であって、芯材の領域Bの長さ方向中央付近の横断面の拡大図を図3に示す。芯材10の外側に隣接してエポキシ樹脂のみの環状領域22が形成され、これに隣接して、間に樹脂シート12に対応するエポキシ樹脂領域がプリプレグシート14に対応する2つの層に挟まれた繊維強化樹脂環状領域24が形成されている。樹脂のみの環状領域22と環状領域24とを併せた領域が、この例における樹脂リッチ層25であり、この例の樹脂リッチ層25の平均樹脂比率は47重量%である。この樹脂リッチ層としては、樹脂のみの層22だけでもよく、また、前記領域24に類似の樹脂比率の高い繊維強化樹脂層のみであってもよい。要は、芯材10に隣接して樹脂リッチ(樹脂のみが好ましい)の層を15〜70ミクロン程度設けることが必要である。好ましくは25〜60ミクロン程度である。上記樹脂リッチ層25の厚さは、全周の平均として50ミクロン程である。   FIG. 3 is an enlarged view of the cross section of the tip end of the cross section in the vicinity of the center in the length direction of the region B of the core material. An annular region 22 made of only epoxy resin is formed adjacent to the outer side of the core material 10, and adjacent to this, an epoxy resin region corresponding to the resin sheet 12 is sandwiched between two layers corresponding to the prepreg sheet 14. A fiber-reinforced resin annular region 24 is formed. The region combining the annular region 22 and the annular region 24 only of the resin is the resin rich layer 25 in this example, and the average resin ratio of the resin rich layer 25 in this example is 47% by weight. As the resin-rich layer, only the resin-only layer 22 may be used, or only the fiber-reinforced resin layer having a high resin ratio similar to the region 24 may be used. In short, it is necessary to provide a resin-rich (only resin is preferable) layer of about 15 to 70 microns adjacent to the core material 10. Preferably it is about 25-60 microns. The thickness of the resin rich layer 25 is about 50 microns as an average of the entire circumference.

断面観察によれば、図3に示す様に、プリプレグシート16によって形成された外側層26には、多数の気泡Vが見られる。ここでは気泡が本体層26のみに存在しているが、樹脂リッチ層25にも少ないながら気泡は発生し得る。即ち、樹脂リッチ層25と外側層26とを併せた繊維強化樹脂領域(層)20に気泡が分布し得る。大部分の気泡のサイズは、横断面図に描いている程度の比率サイズであり、気泡を同等の面積を有する円に置き換えれば、30〜200ミクロン程度の直径の大きさである。また、穂先竿の製法として、焼成時には穂先竿素材を上下方向に吊るすことが関係して、気泡Vの多くは竿の長手方向に添って延伸している。   According to the cross-sectional observation, as shown in FIG. 3, many bubbles V are seen in the outer layer 26 formed by the prepreg sheet 16. Here, bubbles are present only in the main body layer 26, but bubbles can be generated in the resin-rich layer 25 while being small. That is, bubbles can be distributed in the fiber reinforced resin region (layer) 20 including the resin rich layer 25 and the outer layer 26. The size of most bubbles is the ratio size as depicted in the cross-sectional view, and the diameter is about 30 to 200 microns if the bubbles are replaced with circles having an equivalent area. In addition, as a method for manufacturing the spikelet, since the spikelet material is suspended in the vertical direction during firing, many of the bubbles V are stretched along the longitudinal direction of the spike.

多数の気泡Vの分散存在によって、加熱焼成中に内部応力が緩和され、それにより穂先竿素材の曲りが防止される。また、芯材10と外側層26との間の伸び率の相違や、芯材は均質な金属材であるが、外側層は繊維強化樹脂製故不均質である等、特性の相違に基づき、大撓み時に芯材表面と外側層内周面との境界剥離を防止するため、介在した樹脂リッチ層25の柔軟さにより、穂先竿が大撓みした際の芯材と外側層との間の変形による隙間変化を充填追随する。これにより穂先竿としての耐久性が向上する。また、芯材が中実である他金属製でもあるため、気泡の存在による穂先竿の潰れ等は生じ難く、その結果、気泡は穂先竿に対して悪影響を及ぼすことが少ない。
上記例の超弾性合金芯材は中実である。変形例として、少なくとも外側に繊維強化樹脂を設けない先部領域は中実であり、その後方部では後端に開放する穴を設けた管状部でもよい。
The presence of a large number of dispersed bubbles V relieves internal stress during heating and firing, thereby preventing the curling of the tip material. Further, based on the difference in properties such as the difference in elongation between the core material 10 and the outer layer 26, the core material is a homogeneous metal material, the outer layer is made of fiber reinforced resin, and so on. In order to prevent boundary peeling between the core material surface and the inner peripheral surface of the outer layer at the time of large deflection, due to the flexibility of the interstitial resin-rich layer 25, deformation between the core material and the outer layer when the spikelet is largely deflected Follow the gap change due to filling. This improves the durability of the tip. In addition, since the core material is also made of another metal, it is difficult for the tip of the tip to be crushed due to the presence of bubbles, and as a result, the bubbles are less likely to adversely affect the tip of the tip.
The superelastic alloy core material of the above example is solid. As a modified example, the front part region where the fiber reinforced resin is not provided at least on the outside is solid, and the rear part may be a tubular part provided with a hole opened at the rear end.

本発明は、イカダ竿等に適用できる。   The present invention can be applied to squid shells and the like.

図1は本発明に係る穂先竿の製法説明図である。FIG. 1 is an explanatory diagram of a method for producing a spikelet according to the present invention. 図2は図1の製法によって製造された穂先竿の縦断面図である。FIG. 2 is a vertical cross-sectional view of a spikelet manufactured by the manufacturing method of FIG. 図3は図2の矢視線C−Cによる拡大横断面図である。FIG. 3 is an enlarged cross-sectional view taken along line CC of FIG.

符号の説明Explanation of symbols

10 芯材
20 繊維強化樹脂領域
22 樹脂のみの環状領域
25 樹脂リッチ層
DESCRIPTION OF SYMBOLS 10 Core material 20 Fiber reinforced resin area | region 22 The cyclic | annular area | region only of resin 25 Resin rich layer

Claims (5)

超弾性合金を芯材とし、該芯材の先部領域を除く外側に繊維強化樹脂製の外側層を設け、該外側層と芯材との間に設けられると共に芯材外周に接するように前記外側層よりも樹脂比率の大きな樹脂リッチ層を設けた穂先竿であって、芯材を除く繊維強化樹脂領域には気泡が多数分散していることを特徴とする穂先竿。   A superelastic alloy is used as a core material, and an outer layer made of a fiber reinforced resin is provided outside the core material excluding the front region, and the outer layer is provided between the outer layer and the core material and is in contact with the outer periphery of the core material. A spike tip provided with a resin rich layer having a resin ratio larger than that of the outer layer, wherein a large number of bubbles are dispersed in the fiber reinforced resin region excluding the core material. 前記気泡の多くは穂先竿の長手方向に長い形態である請求項1記載の穂先竿。   The tip of the tip of claim 1, wherein most of the bubbles are in the form of a long tip in the longitudinal direction of the tip of the tip. 前記樹脂リッチ層は樹脂比率が99重量%以上である請求項1又は2記載の穂先竿。   3. The spikelet according to claim 1 or 2, wherein the resin-rich layer has a resin ratio of 99% by weight or more. 前記樹脂リッチ層は、径方向外側領域がガラス繊維によって強化された繊維強化樹脂領域であり、芯材側領域は樹脂比率が99重量%以上である請求項1又は2記載の穂先竿。   3. The spikelet according to claim 1, wherein the resin-rich layer is a fiber-reinforced resin region in which a radially outer region is reinforced with glass fibers, and a core-side region has a resin ratio of 99% by weight or more. 前記樹脂リッチ層を設けた芯材領域は、ストレートか又は3/1000以下のテーパ率である請求項1〜4の何れか1記載の穂先竿。   5. The spikelet according to claim 1, wherein the core region provided with the resin-rich layer is straight or has a taper ratio of 3/1000 or less.
JP2004023087A 2004-01-30 2004-01-30 Earhead Expired - Fee Related JP4285745B2 (en)

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