JP2007100858A - Multi-pitch bolt, multi-pitch bolt and nut - Google Patents

Multi-pitch bolt, multi-pitch bolt and nut Download PDF

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JP2007100858A
JP2007100858A JP2005292349A JP2005292349A JP2007100858A JP 2007100858 A JP2007100858 A JP 2007100858A JP 2005292349 A JP2005292349 A JP 2005292349A JP 2005292349 A JP2005292349 A JP 2005292349A JP 2007100858 A JP2007100858 A JP 2007100858A
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thread
nut
section
screw
bolt
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Naoki Sase
直樹 佐瀬
Hiroshi Fujii
洋 藤井
Hironori Kito
弘典 鬼頭
Kenichi Katayama
憲一 片山
Yoshinori Moriguchi
善則 森口
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Nagoya Industrial Science Research Institute
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a multi-pitch bolt which enables a nut to be easily fed manually and to be tightened to such an extent that the nut is not loosened. <P>SOLUTION: Side walls of a thread 12c of the multi-pitch bolt 10 are formed so that districts where a lead angle is gentle and districts where a lead angle is steep are alternately continued along the helix of the thread 12c. As a result, a more effective loose prevention function is fulfilled due to frictional force in the districts where the lead angle is gentle while realizing large effective lead. Since the side walls of the thread 12c of the multi-pitch bolt 10 are formed in a circular arc in section, the nut 20 is easily fed manually. The nut 20 is tightened to such an extent that it is not loosened by tightening the nut 20 with a tool at the end. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、複数のリードを有するマルチピッチねじ（ねじのねじ山が、つるまき線に沿って１回転する間にリード角の緩い区間とリード角の急な区間とが交代して、交互に連続するように形成されているマルチピッチねじ）を備えるマルチピッチボルトに関し、特に、土木建築分野においてコンクリート構築のために使用される型枠を締め付けるボルトに好適なマルチピッチボルトに関するものである。 In the present invention, a multi-pitch screw having a plurality of leads (the section where the lead angle is loose and the section where the lead angle is steep is changed alternately while the thread of the screw rotates once along the spiral line. More particularly, the present invention relates to a multi-pitch bolt suitable for a bolt for fastening a formwork used for concrete construction in the field of civil engineering and construction.

締結用のねじの緩みについては多くの対策が立てられたが、いずれも完全ではなかった。従来のねじの概念「ある一定のピッチを持つ螺旋」を変えた複数のリードを持つねじ、即ち、ピッチが異なるリード部分が連続して設けられた「マルチピッチねじ」により、この問題が解決できることが、本件の発明者らの研究によって確認されている（非特許文献１） Many measures have been taken to loosen the fastening screws, but none of them were perfect. This problem can be solved by a screw having a plurality of leads in which the conventional screw concept “spiral having a certain pitch” is changed, that is, a “multi-pitch screw” in which lead portions having different pitches are continuously provided. Has been confirmed by the study of the inventors of the present case (Non-patent Document 1).

また、複数のリードを持つマルチピッチねじのボルトとナットの構成および組み合わせと、それらを送りねじ機構等に応用するものが、本件発明者らによって提案されている（特願２００２−３４６８９１号）。 Further, the present inventors have proposed a configuration and combination of multi-pitch screw bolts and nuts having a plurality of leads and applying them to a feed screw mechanism (Japanese Patent Application No. 2002-346891).

同様に、回転ダイスを用いて製造できるマルチピッチねじ、および、その製造方法及び製造装置に関するもの、更には、マルチピッチねじを備えたナット部材に関するものが、本件発明者らによって先に提案されている（特願２００４−２３０１１９号、特願２００４−２３０１２０号） Similarly, the present inventors have previously proposed a multi-pitch screw that can be manufactured using a rotary die, a manufacturing method and a manufacturing apparatus thereof, and a nut member that includes a multi-pitch screw. (Japanese Patent Application Nos. 2004-230119 and 2004-230120)

同様に、転造加工が容易な最適なねじ山を備えたマルチピッチねじ（ボルト部材）、それを製造する方法、および、製造装置が、本件発明者らによって先に提案されている。（特願２００４−３３５３１５号） Similarly, the present inventors have previously proposed a multi-pitch screw (bolt member) having an optimal thread that can be easily rolled, a method of manufacturing the multi-pitch screw, and a manufacturing apparatus. (Japanese Patent Application No. 2004-335315)

一方、コンクリート構築のための型枠締め付けに使用される締め付け具の従来技術としては、締め付けボルト（締付杵）とナットとの緩み止め防止のために、押さえ座金に弾性体から成る緩み止め片を取り付けたものが公知である（特許文献１）。 On the other hand, as a conventional technique of a fastening tool used for fastening a formwork for building a concrete, a locking piece made of an elastic body is used as a press washer to prevent a fastening bolt (clamping rod) and a nut from being loosened. Is known (Patent Document 1).

なお、従来の型枠締め付け用のボルトとしては、用途によって種々のねじ形状のものが存在する。型枠の締め付け現場における作業性に優れたものとして、例えば図９および図１０に示すものが公知である。図９（Ａ）は従来技術に係る型枠用ボルトを示す側面図であり、図９（Ｂ）はナットを示す斜視図である。型枠用ボルト１１０には、ナット２０が螺合される円弧状のねじ溝を有する円弧ねじ部１５と、断面三角形状のねじ溝を有する普通ねじ部１４と、スパナ等の締め付け工具が係合される両側面取り部１６とが設けられている。普通ねじ部１４は、コンクリート内に埋め込まれるセパレータ側に螺合され、円弧ねじ部１５には、ナット２０が係合され、型枠の締め付けが行われる。図１０は、図９（Ａ）に示すボルトに図９（Ｂ）に示すナットを係合させた状態の断面図である。ボルト１１０の円弧ねじ部１５には、断面形状が略円弧状のねじ溝１５ｂが形成されている。一方、ナット２０のねじ孔２２には、ねじ溝１５ｂを反転した略円弧状にねじ山２２ｂが形成されている。 In addition, as a conventional bolt for clamping a formwork, there are various screw shapes depending on applications. For example, what is shown in FIG. 9 and FIG. 10 is well-known as a thing excellent in workability | operativity in the clamping field of a formwork. FIG. 9A is a side view showing a conventional formwork bolt, and FIG. 9B is a perspective view showing a nut. The mold bolt 110 is engaged with an arc thread portion 15 having an arc-shaped thread groove into which the nut 20 is screwed, a normal thread portion 14 having a triangular thread groove, and a tightening tool such as a spanner. Both side chamfered portions 16 are provided. The normal screw portion 14 is screwed to the separator side embedded in the concrete, and the nut 20 is engaged with the arc screw portion 15 to tighten the formwork. FIG. 10 is a cross-sectional view of the bolt shown in FIG. 9A engaged with the nut shown in FIG. 9B. A thread groove 15b having a substantially arc-shaped cross section is formed in the arc threaded portion 15 of the bolt 110. On the other hand, a thread 22b is formed in the screw hole 22 of the nut 20 in a substantially arc shape obtained by inverting the thread groove 15b.

ここで、上記従来の型枠用ボルト１１０の円弧ねじ部１５としては、例えば、円弧ねじ部１５の直径Ｄ１が略１２ｍｍ、ねじ溝１５ｂの断面は半径ｒ１が略２．２ｍｍの円周Ｓ１の概ね１／４から１／３程度の円弧状、ねじのピッチＰ１が略４．２ｍｍ、リード角が略６度程度の比較的大きなねじ形状を備えたものが一般的である。一方、ナット２０のねじ山２２ｂは、型枠用ボルト１１０の円弧ねじ部１５およびねじ溝１５ｂに対して全体的に略０．１ｍｍ以上の大きなクリアランスを有するように設定されている。 Here, as the arc screw portion 15 of the conventional mold bolt 110, for example, the diameter D1 of the arc screw portion 15 is approximately 12 mm, and the cross section of the screw groove 15b is a circumference S1 having a radius r1 of approximately 2.2 mm. Generally, it has an arc shape of about ¼ to ３, a relatively large screw shape with a screw pitch P1 of about 4.2 mm and a lead angle of about 6 degrees. On the other hand, the thread 22b of the nut 20 is set so as to have a large clearance of approximately 0.1 mm or more as a whole with respect to the arc threaded portion 15 and the thread groove 15b of the mold bolt 110.

従って、これらの型枠用ボルト１１０とナット２０の組合せを使用すれば、ナット２０を手で簡単に螺合／送り操作ができ、最後の締め付けのみ工具で行えばよく、現場での作業効率が向上する利点がある。更に、上記のようにねじ溝１５ｂの断面は大きく、かつ、広口の略円弧状に設定されているため、コンクリートの型枠内への流し込み時に円弧ねじ部１５に飛散したコンクリートが付着しても、ナット２０の取り外し（回転）によって、付着したコンクリートを簡単に排除できる。
実公平６−２９３５８号公報 日本機械学会論文集、Ｃ編、６２巻（５９７号）、ｐ１９６３−１９６８、「極端にゆるみにくいねじ締結体の開発」、藤井 洋、他、１９９６年。 Therefore, if a combination of these formwork bolts 110 and nuts 20 is used, the nuts 20 can be easily screwed / feeded by hand, and only the final tightening needs to be performed with a tool. There is an advantage to improve. Further, as described above, the thread groove 15b has a large cross section and is set to have a wide-circular arc shape. Therefore, even if the concrete scattered to the arc screw portion 15 adheres when the concrete is poured into the mold. The attached concrete can be easily removed by removing (rotating) the nut 20.
Japanese Utility Model Publication No. 6-29358 Transactions of the Japan Society of Mechanical Engineers, volume C, volume 62 (597), p1963-1968, “Development of screw fasteners that are extremely resistant to loosening”, Hiroshi Fujii, et al., 1996.

上記従来の型枠用ボルトは、現場での作業性に優れ、また、付着したコンクリートが簡単に排除できるものの、コンクリートの流し込み時に気泡等を除去するために型枠あるいは流し込んだコンクリート内にバイプレータで振動を与えると、その振動によってボルトおよびナットの締め付けが緩みやすい欠点があった。更に、このように緩んだボルトおよびナットの締め付けは、人手によって個々に点検、締め直しが必要で、現場での作業が繁雑、非効率となる不都合があった。 The above-mentioned conventional bolts for formwork are excellent in workability on site and can easily remove adhering concrete, but in order to remove air bubbles etc. when pouring concrete, a vibrator is used in the formwork or poured concrete. When vibration was applied, there was a drawback that the bolts and nuts were easily loosened by the vibration. Further, the tightening of the bolts and nuts thus loosened requires manual inspection and retightening manually, which has the disadvantage that the work on the site is complicated and inefficient.

一方、前述の本件発明者らによって提案された緩み防止機能を有するマルチピッチねじのボルトとナットは、機械分野における比較的細かなねじ山／ねじ溝を備えた通常のねじ（断面が略三角形のねじ溝、ねじ山）を想定したものであった。このため、上記マルチピッチねじのボルトとナットを型枠用ボルトにこのまま適用すると、上記従来の型枠用ボルトが有する利点、即ち、「ナットをボルトに手で簡単に螺合／ネットの送り操作ができ、最後の締め付けのみ工具で行える効率の良さ」を損なうという課題が生じる。 On the other hand, the bolts and nuts of the multi-pitch screw having the function of preventing loosening proposed by the present inventors described above are ordinary screws having a relatively fine thread / thread groove in the mechanical field (the cross-section is substantially triangular). Thread groove, thread). For this reason, if the bolts and nuts of the multi-pitch screw are applied to the formwork bolts as they are, the advantage of the conventional formwork bolts, that is, “the nut is easily screwed onto the bolt by hand / the net feed operation The problem arises that the “efficiency of efficiency that can be performed with the tool only for the final tightening” is impaired.

更に、型枠用ボルトの略円弧状の浅くて広口のねじ溝を形成するには、転造ダイス側のねじ山も断面が緩やかな略円弧状とする必要があり、転造時における転造ダイス側のねじ山の被転造部材への当たり面、あるいは食い込み部が、通常のねじ（断面が略三角形のねじ溝、ねじ山）の転造に比べて不安定となる。このため、この種のねじをねじの条線に沿って変化するマルチピッチねじとして形成するには、より転造が難しく、大量生産には不向きであった。 Furthermore, in order to form a generally arc-shaped shallow and wide-mouthed thread groove for a formwork bolt, the thread on the rolling die side must also have a generally arc shape with a gentle cross section. The contact surface of the screw thread on the die side to the member to be rolled, or the biting portion becomes unstable compared to the rolling of a normal screw (a thread groove or a thread having a substantially triangular cross section). For this reason, in order to form this type of screw as a multi-pitch screw that changes along the thread line, it is more difficult to roll and unsuitable for mass production.

本発明は、上述した課題を解決するためになされたものであり、その目的とするところは、ナットを手で簡単に送り操作できると共に、緩みが生じないように締め付けることができるマルチピッチボルト、マルチピッチボルト及びナットを提供することにある。 The present invention has been made in order to solve the above-described problems, and an object of the present invention is to provide a multi-pitch bolt capable of easily feeding a nut by hand and tightening so as not to loosen. To provide multi-pitch bolts and nuts.

上記課題を解決するため、請求項１のマルチピッチボルトは、ねじ溝の側壁が、断面略円弧状に形成されると共に、つるまき線に沿って回転する間にリード角の緩い区間とリード角の急な区間とが交代して、交互に連続するように形成され、ねじ溝の底部に、Ｖ字状の溝部を設けたことを技術的特徴とする。 In order to solve the above-mentioned problem, the multi-pitch bolt according to claim 1 is characterized in that the side wall of the thread groove is formed in a substantially arc shape in cross section, and the section having a loose lead angle and the lead angle while rotating along the spiral line. This is characterized in that it is formed so as to alternate alternately with the steep section and to have a V-shaped groove at the bottom of the screw groove.

請求項１、請求項４の発明では、ねじ山の側壁が、つるまき線に沿って回転する間にリード角の緩い区間とリード角の急な区間とが交代して、交互に連続している。このようにマルチピッチねじを形成することで、ねじ全体の実効的リードはリード角の緩い区間とリード角の急な区間との平均値となる。そして、ねじの緩みに対する対抗力は、軸方向の力によるリード角の緩い区間での相手の部材との摩擦力が支配的になるから、大きな実効的リードを持ちながら、リード角の緩い区間の摩擦力により強い緩み止め作用を奏する。 In the first and fourth aspects of the present invention, the section where the lead angle is loose and the section where the lead angle is steep are alternated while the side wall of the screw thread rotates along the spiral line. Yes. By forming the multi-pitch screw in this way, the effective lead of the entire screw becomes an average value of a section having a loose lead angle and a section having a steep lead angle. And, the counteracting force against the loosening of the screw is dominated by the frictional force with the mating member in the section where the lead angle is loose due to the axial force. Strong anti-loosening action due to frictional force.

また、ねじ山の側壁が、断面略円弧状に形成されているため、断面略円弧状のねじ溝側壁を有するナットを用いて、ナットを手で簡単に送り操作（締め付け）ができる。最後に、工具を用いて締め付けることで、ねじ山のリード角の緩い区間の摩擦力により強い緩み止め作用を奏する。即ち、緩みが生じないようにナットを締め付けることができる。 Further, since the thread side wall is formed in a substantially arc-shaped cross section, the nut can be easily fed (tightened) by hand using a nut having a thread groove side wall having a substantially arc-shaped cross section. Finally, by tightening with a tool, a strong loosening prevention action is exerted by the frictional force in the section where the lead angle of the thread is loose. That is, the nut can be tightened so as not to loosen.

請求項１では、ねじ溝の底部に、Ｖ字状の溝部を設けるため、転造ダイスのねじ山の頂部にＶ字状の凸部を設けることができる。請求項４では、ねじ溝の底部に、断面略半円弧状の溝部を設けるため、転造ダイスのねじ山の頂部に断面半円弧状の凸部を設けることができる。この凸部が被加工物（ボルト）に食い込むので、転造ダイスと被加工物との間で生じる応力が変化する上記ねじ山を容易に転造加工できる。なお、ねじ山の側壁は、ねじ山の中心線に対して対称となるように形成されていることが望ましい。これにより、ねじ山、ねじ溝が常に左右対称であり、被加工物（ボルト）の軸心を変動させる無理な力は発生せず転造加工が安定して行える。 According to the first aspect, since the V-shaped groove is provided at the bottom of the thread groove, the V-shaped protrusion can be provided at the top of the thread of the rolling die. According to the fourth aspect of the present invention, since the groove portion having a substantially semicircular cross section is provided at the bottom of the screw groove, a convex portion having a semicircular cross section can be provided at the top of the thread of the rolling die. Since this convex part bites into the work piece (bolt), the above-described thread that changes the stress generated between the rolling die and the work piece can be easily rolled. Note that the side wall of the screw thread is preferably formed so as to be symmetric with respect to the center line of the screw thread. As a result, the thread and the thread groove are always left-right symmetric, and an excessive force that fluctuates the axis of the workpiece (bolt) is not generated, so that the rolling process can be performed stably.

請求項２では、Ｖ字状の溝部の側壁が、ねじ溝の側壁の断面を構成する円弧の接線となるように形成されているので、段差がなく、形成が容易である。また、Ｖ字状の溝部の断面が略２等辺三角形となるように形成されているので、被加工物（ボルト１０）の軸心を変動させる無理な力が発生せず、転造加工が安定して行える。 According to the second aspect of the present invention, since the side wall of the V-shaped groove portion is formed so as to be tangent to the arc constituting the cross section of the side wall of the thread groove, there is no step and the formation is easy. In addition, since the cross section of the V-shaped groove is formed into an approximately isosceles triangle, an excessive force that fluctuates the axis of the workpiece (bolt 10) does not occur, and the rolling process is stable. You can do it.

請求項３では、Ｖ字状の溝部が一定リード角に形成されているため、被加工物（ボルト１０）の軸心を変動させる無理な力は発生せず、被加工物（ボルト１０）の転造加工が安定して行える。 According to the third aspect of the present invention, since the V-shaped groove is formed at a constant lead angle, an excessive force that fluctuates the axis of the workpiece (bolt 10) does not occur, and the workpiece (bolt 10) Rolling process can be performed stably.

請求項５では、ナットのねじ溝の側壁が断面略円弧状であるので、ナットを手で簡単に送り操作（締め付け）ができる。最後に、工具を用いて締め付けることで、ねじ山のリード角の緩い区間の摩擦力により強い緩み止め作用を奏する。即ち、緩みが生じないようにナットを締め付けることができる。 According to the fifth aspect, since the side wall of the thread groove of the nut has a substantially circular arc shape, the nut can be easily fed (tightened) by hand. Finally, by tightening with a tool, a strong loosening prevention action is exerted by the frictional force in the section where the lead angle of the thread is loose. That is, the nut can be tightened so as not to loosen.

請求項６では、マルチピッチボルト側のねじ溝の底部にＶ字状又は半円弧状の溝部を設け、ナット側のねじ山の頂部に設けられた平面状の部分と組み合わせることで、該Ｖ字状又は半円弧状の溝部と頂部の間に断面が略二等辺三角形形状又は半円弧状の空間が形成される。このため、例えば、マルチピッチボルト及びナットがコンクリート構築のための型枠締め付けに使用される締め付け具として用いられた際に、マルチピッチボルトに付着したコンクリートが、ナットの回転で粉砕されてモルタル粉となって該空間内へ導かれ、無理なく排出される。 According to the sixth aspect of the present invention, a V-shaped or semicircular arc-shaped groove is provided at the bottom of the multi-pitch bolt-side thread groove, and combined with a planar portion provided at the top of the nut-side thread. A space having a substantially isosceles triangular shape or a semicircular arc shape is formed between the groove portion and the top portion having a circular or semicircular arc shape. For this reason, for example, when multi-pitch bolts and nuts are used as fasteners used for formwork tightening for concrete construction, the concrete attached to the multi-pitch bolts is crushed by the rotation of the nuts and mortar powder It is guided into the space and discharged without difficulty.

図１〜図６を参照して本発明係るマルチピッチボルトを型枠用ボルトに適用した第１実施形態について説明する。始めに図１を参照して、本発明の実施形態における型枠用ボルト１０の全体形状について説明する。型枠用ボルト１０は金属製の棒状部材の一方にマルチピッチねじ部１２が、他方に普通ねじ部１４が一体に形成されており、その中ほどにスパナ等の締め付け工具が係合される両側面取り部１６が設けられている。
マルチピッチねじ部１２は従来の型枠用ボルトと同様に、大きな断面で広口の略円弧状のねじ溝を基本形とし、当該ねじ溝の基本形に後ほど詳述するマルチピッチねじの形状を重ねたねじ溝／ねじ山を有している。また、普通ねじ部１４は機械分野における通常のねじ（断面が略三角形のねじ溝／ねじ山）と同様のねじ形状が設けられている。 A first embodiment in which a multi-pitch bolt according to the present invention is applied to a formwork bolt will be described with reference to FIGS. First, with reference to FIG. 1, the overall shape of the bolt 10 for formwork in the embodiment of the present invention will be described. The formwork bolt 10 is integrally formed with a multi-pitch screw portion 12 on one side of a metal rod-like member and a normal screw portion 14 on the other side, and is engaged with a tightening tool such as a spanner in the middle. A chamfer 16 is provided.
The multi-pitch thread portion 12 has a large cross-section and a substantially arc-shaped thread groove with a large cross section as a basic shape, similar to a conventional formwork bolt, and a multi-pitch screw shape that will be described in detail later on the basic shape of the thread groove. Has grooves / threads. Further, the normal screw portion 14 is provided with a screw shape similar to a normal screw (thread groove / thread) having a substantially triangular cross section.

続いて図２を参照して、型枠用ボルト１０に形成されたマルチピッチねじ部１２の詳細形状について説明する。
図２（Ａ）は、マルチピッチねじ部１２を平面的に展開した説明図である。ねじ山１２ｃとねじ山１２ｃとの間にあるねじ溝（ねじ溝の側壁）１２ｂの断面は、二点鎖線で示される円Ｓ２の円周の略１／４〜１／３程度の部分が通り抜ける形状に設定されている。ねじ山１２ｃ及びねじ溝１２ｂは、一定の長さを進む毎に屈曲され、マルチピッチねじの形状を呈している。即ち、つるまき線に沿って１回転する間にリード角の緩い区間とリード角の急な区間とが交代して、交互に連続するように形成されている。 Next, the detailed shape of the multi-pitch screw portion 12 formed on the mold bolt 10 will be described with reference to FIG.
FIG. 2A is an explanatory view in which the multi-pitch screw portion 12 is developed in a plane. In the cross section of the thread groove (side wall of the thread groove) 12b between the thread 12c and the thread 12c, a portion of about ¼ to ３ of the circumference of the circle S2 indicated by a two-dot chain line passes through. The shape is set. The thread 12c and the thread groove 12b are bent each time a certain length is advanced, and have a multi-pitch screw shape. That is, the section having a gentle lead angle and the section having a steep lead angle are alternated during one rotation along the spiral line, and are formed to be alternately continuous.

また、上記のねじ溝１２ｂの最底部の軌跡１１１および軌跡１１２はほぼ同一の長さを有する。マルチピッチねじ部１２のリード角は、軌跡１１１および軌跡１１２と、型枠用ボルト１０の軸線との平均角度によって定まる。第１実施形態においては、軌跡１１１によって定まるリード角がゼロ度、軌跡１１２によって定まるリード角が１２度に設定されており、従来の型枠用ボルトと同程度に、平均リード角が約６度となっている。 Further, the locus 111 and the locus 112 at the bottom of the thread groove 12b have substantially the same length. The lead angle of the multi-pitch thread portion 12 is determined by the average angle between the trajectory 111 and the trajectory 112 and the axis of the mold bolt 10. In the first embodiment, the lead angle determined by the trajectory 111 is set to zero degrees, and the lead angle determined by the trajectory 112 is set to 12 degrees, and the average lead angle is about 6 degrees, similar to the conventional formwork bolt. It has become.

図２（Ｂ）は図１のＡ部の拡大断面図であり、ここでは、ナット２０の断面も同時に示してあり、先に図２において模擬的に示した円Ｓ２が同様に二点鎖線で示されている。ナット２０は、先に図９および図１０で説明した従来技術のナット２０と同様であり、ねじ山２２ｂはねじ溝１２ｂを反転した略円弧状で、その先端部に直線状のカット部２２ｃが設けられた断面形状に設定されている。 2B is an enlarged cross-sectional view of a portion A in FIG. 1. Here, the cross section of the nut 20 is also shown at the same time, and the circle S2 previously simulated in FIG. It is shown. The nut 20 is the same as the nut 20 of the prior art described above with reference to FIGS. 9 and 10, and the screw thread 22b has a substantially arc shape obtained by inverting the screw groove 12b, and a linear cut portion 22c is formed at the tip thereof. The cross-sectional shape provided is set.

ここで、ねじ溝１２ｂの両側部には上記の円Ｓ２の円弧に沿った円弧面（側壁）１２ｄ、１２ｄが形成されており、ねじ溝１２ｂの最底部には当該円弧面１２ｄの略接線方向に沿った左右の平面部１２ｅ，１２ｅが連接されている。従って、左右の平面部１２ｅ，１２ｅによってねじ溝１２ｂの最底部には下端の尖ったＶ字状の溝部１２fが設けられている。 Here, arc surfaces (side walls) 12d and 12d along the arc of the circle S2 are formed on both sides of the thread groove 12b, and the bottom surface of the thread groove 12b is substantially tangential to the arc surface 12d. The left and right plane portions 12e, 12e along the line are connected. Therefore, a V-shaped groove portion 12f having a sharp lower end is provided at the bottom of the screw groove 12b by the left and right plane portions 12e and 12e.

ナット２０のねじ山２２ｂの側壁は、ねじ溝１２ｂの左右の円弧面１２ｄ、１２ｄと比較的大きな間隔（従来の型枠用ボルト１０と同様に０．１ｍｍ程度以上）を有する設定となっている。このため、型枠用ボルト１０にナット２０を螺合した状態で、ナット２０のねじ山２２ｂがねじ溝１２ｂに比較的大きな間隔を以て緩く係合しており、手で簡単にナットの送り操作ができるようになっている。 The side wall of the screw thread 22b of the nut 20 is set to have a relatively large distance from the left and right circular arc surfaces 12d, 12d of the screw groove 12b (about 0.1 mm or more as with the conventional mold bolt 10). . For this reason, the thread 22b of the nut 20 is loosely engaged with the thread groove 12b with a relatively large interval in a state where the nut 20 is screwed onto the mold bolt 10, and the nut can be easily fed by hand. It can be done.

図３および図４は、本発明の型枠用ボルト１０を用いてコンクリート用型枠を締め付ける場合を説明する図である。
図４は、図３のＢ−Ｂ断面図に相当する。対向する型枠３２、３２の間にはセパレータ３４が設けられ、コンクリートが流し込まれる空間を作り出している。セパレータ３４の両端のねじ山３４ａは、略円錐状のストッパー３６に設けられた一方のねじ孔３６aに螺合される。また、ストッパー３６の他方に設けられたねじ孔３６ｂには、型枠３２の穴３２ａを貫通して、型枠用ボルト１０の普通ねじ部１４の先端が螺合されている。型枠用ボルト１０の他端のマルチピッチねじ部１２に押さえ金具４２を介してナット２０を締め付けることで、型枠３２を横ばた材３８、縦ばた材４０で押さえ付けている。 FIG. 3 and FIG. 4 are diagrams for explaining the case where the concrete mold is tightened using the mold bolt 10 of the present invention.
FIG. 4 corresponds to the BB cross-sectional view of FIG. A separator 34 is provided between the opposing molds 32 and 32 to create a space into which concrete is poured. The thread 34 a at both ends of the separator 34 is screwed into one screw hole 36 a provided in the substantially conical stopper 36. In addition, the tip of the normal screw portion 14 of the mold bolt 10 is screwed into the screw hole 36b provided on the other side of the stopper 36 through the hole 32a of the mold 32. By tightening the nut 20 to the multi-pitch screw portion 12 at the other end of the bolt 10 for the formwork through the holding metal fitting 42, the formwork 32 is pressed by the horizontal member 38 and the vertical member 40.

上述したように、ナット２０のねじ山２２ｂがねじ溝１２ｂに比較的大きな間隔を以て緩く係合しており、手で簡単にナット２０の送り操作ができる。ナット２０を手で送った後に、工具を用いてナット２０を所定のトルク以上で締め付けると、図２（Ｂ）に示すナット２０のねじ山２２ｂが型枠締め付け用ボルト１０のねじ溝１２ｂの一方の側の円弧面１２ｄ側に押圧されて、部分的に弾性変形（一部塑性変形を伴う場合もある）する。これにより、ねじ山２２ｂがねじ溝１２ｂのリードがゼロの領域で接触し、マルチピッチねじの緩み止めにより、緩み防止効果が生じる。このため、コンクリートの流し込み時に気泡等を除去するために型枠あるいは流し込んだコンクリート内にバイプレータで振動を与えても、振動によってナット２０が緩むことがなくなる。 As described above, the screw thread 22b of the nut 20 is loosely engaged with the screw groove 12b with a relatively large interval, and the nut 20 can be easily fed by hand. When the nut 20 is manually tightened and then tightened with a tool with a predetermined torque or more, the screw thread 22b of the nut 20 shown in FIG. And is partially elastically deformed (sometimes accompanied by plastic deformation). As a result, the thread 22b comes into contact in a region where the lead of the thread groove 12b is zero, and the multi-pitch screw is prevented from loosening, thereby producing a loosening prevention effect. For this reason, even if vibration is applied to the formwork or the poured concrete in order to remove bubbles or the like when the concrete is poured, the nut 20 is not loosened by the vibration.

続いて、上記の型枠用ボルト１０のマルチピッチねじ部１２の転造加工を行うダイスについて、図５及び図６を参照して説明する。
図５（Ａ）はマルチピッチねじの転造用のダイス５０の側面図であり、図５（Ｂ）は、図５（Ａ）のＣ−Ｃ断面図である。図６（Ａ）は、複数の回転ダイスの内の少なくとも一つに形成したマルチピッチねじの転造用のねじ山、ねじ溝を説明用に平面的に展開して示した図である。ダイス５０の外周には、ねじ山５２及びねじ溝５３が形成されている。ねじ山５２及びねじ溝５３は、先に説明の型枠用ボルト１０のマルチピッチねじ部１２のねじ溝１２ｂとねじ山１２ｃを略反転した形状に設定されている。ねじ山５２の項部には、円弧面５２ａの接線に沿って形成される左右の平面部５２ｂ（平面的に展開されているために図では単純な平面あるいは平坦で示される）に囲まれた凸部５２ｃが設けられている。なお、平ダイスにおいても本発明を実施することは可能であり、回転ダイスに限定されるものではない。 Subsequently, a die for rolling the multi-pitch screw portion 12 of the above-described mold bolt 10 will be described with reference to FIGS. 5 and 6.
FIG. 5 (A) is a side view of a die 50 for rolling a multi-pitch screw, and FIG. 5 (B) is a sectional view taken along the line CC in FIG. 5 (A). FIG. 6A is a diagram in which a thread and a thread groove for rolling a multi-pitch screw formed on at least one of a plurality of rotating dies are expanded in plan for explanation. A screw thread 52 and a screw groove 53 are formed on the outer periphery of the die 50. The screw thread 52 and the screw groove 53 are set in a shape that is substantially reversed from the screw groove 12b and the screw thread 12c of the multi-pitch screw portion 12 of the previously described formwork bolt 10. The section of the screw thread 52 is surrounded by left and right plane portions 52b formed along the tangent line of the circular arc surface 52a (shown as a simple plane or flat in the figure because they are flatly developed). A convex portion 52c is provided. It should be noted that the present invention can also be implemented in a flat die, and is not limited to a rotating die.

図６（Ｂ）は、図６（Ａ）に示す回転ダイス５０によって型枠用ボルト１０にマルチピッチねじ部１２を転造加工する初期状態を模擬的に示す図である。図６（ｂ）に示されるように、ダイス５０のねじ山５２の頂部に設けられた先の尖った凸部５２ｃが型枠用ボルト１０の円筒状の外周面に最初に食い込む。このため、位置決めが安定した状態で順次円弧面を有するねじ溝１２ｂが転造加工される。 FIG. 6B is a diagram schematically showing an initial state in which the multi-pitch screw portion 12 is rolled into the mold bolt 10 by the rotary die 50 shown in FIG. As shown in FIG. 6B, the pointed convex portion 52 c provided at the top of the screw thread 52 of the die 50 first bites into the cylindrical outer peripheral surface of the mold bolt 10. For this reason, the thread groove 12b having a circular arc surface is sequentially rolled while the positioning is stable.

[第２実施形態]
図７は、第２実施形態に係るマルチピッチねじ部１２のねじ溝１２ｂを示す図である。この実施形態においては、基本となる断面が円弧状のねじ溝１２ｂの最底部に断面が小さな半円弧状の凹部１２ｇが形成されており、この凹部１２ｇが上記の溝部１２fと同様の働きをする。 [Second Embodiment]
FIG. 7 is a view showing the thread groove 12b of the multi-pitch thread portion 12 according to the second embodiment. In this embodiment, a semicircular arc-shaped concave portion 12g having a small cross section is formed at the bottom of the thread groove 12b having a basic arc-shaped cross section, and the concave portion 12g functions in the same manner as the groove portion 12f. .

[第３実施形態]
図８は、第３実施形態に係る型枠締め付け用ボルトのマルチピッチねじ部を平面的に展開した説明図である。図２（Ａ）を参照して上述した第１実施形態では、ねじ溝１２ｂの最底部の軌跡１１１によって定まるリード角がゼロ度、軌跡１１２によって定まるリード角が１２度に設定されていた。これに対して、第３実施形態では、第１実施形態と同様にねじ山１２ｃは、一定の長さを進む毎に屈曲され、マルチピッチねじの形状を呈している。即ち、つるまき線に沿って１回転する間にリード角の緩い区間とリード角の急な区間とが交代して、交互に連続するように形成されている。しかしながら、Ｖ字状の溝部１２ｆは、一定リード角（例えば６度）に形成されている。第３実施形態では、Ｖ字状の溝部１２ｆが一定リード角に形成されているため、転造加工の際にボルト１０の軸心を変動させる無理な力は発生せず、ボルト１０の転造加工が安定して行える。 [Third embodiment]
FIG. 8 is an explanatory view in which the multi-pitch thread portion of the mold clamping bolt according to the third embodiment is developed in a planar manner. In the first embodiment described above with reference to FIG. 2A, the lead angle determined by the locus 111 at the bottom of the thread groove 12b is set to zero degrees, and the lead angle determined from the locus 112 is set to 12 degrees. On the other hand, in the third embodiment, as in the first embodiment, the thread 12c is bent every time it proceeds a certain length, and has the shape of a multi-pitch screw. That is, the section having a gentle lead angle and the section having a steep lead angle are alternated during one rotation along the spiral line, and are formed to be alternately continuous. However, the V-shaped groove 12f is formed at a constant lead angle (for example, 6 degrees). In the third embodiment, since the V-shaped groove portion 12f is formed at a constant lead angle, an excessive force that fluctuates the axis of the bolt 10 is not generated during rolling, and the bolt 10 is rolled. Processing can be performed stably.

以上の説明から明らかなように、ねじ溝１２ｂの最底部に溝部１２fあるいは凹部１２ｇを設けることにより、転造加工時の位置決めが安定し、加工が容易となる。
また、図２（Ｂ）に示されるように、ねじ溝１２ｂの最底部に設けられた溝部１２fとナット２０のねじ山２２ｂの先端部の間に、断面が略２等辺三角形の空間が形成される。このため、コンクリートの型枠内への流し込み時に円弧ねじ部１５に飛散したコンクリートが付着しても、ナット２０の回転で粉砕されたモルタルがこの断面略２等辺三角形の空間内に導かれ、無理なく排出される。 As is apparent from the above description, by providing the groove 12f or the recess 12g at the bottom of the screw groove 12b, the positioning during the rolling process is stabilized and the process becomes easy.
Further, as shown in FIG. 2B, a space having a substantially isosceles triangle cross section is formed between the groove portion 12f provided at the bottom of the screw groove 12b and the tip end portion of the screw thread 22b of the nut 20. The For this reason, even if the concrete scattered to the arc threaded portion 15 adheres when the concrete is poured into the mold, the mortar pulverized by the rotation of the nut 20 is guided into the space having a substantially isosceles triangle cross section. It is discharged without.

本発明の第１実施形態における型枠用ボルトを示す平面図である。It is a top view which shows the bolt for formwork in 1st Embodiment of this invention. 図２（Ａ）は、図１に示す型枠締め付け用ボルトのマルチピッチねじ部を平面的に展開した説明図であり、図２（Ｂ）は、図１のＡ部を示す拡大断面図である。2A is an explanatory view in which the multi-pitch thread portion of the bolt for tightening the mold shown in FIG. 1 is developed in a plan view, and FIG. 2B is an enlarged cross-sectional view showing the portion A in FIG. is there. 第１実施形態に係る型枠用ボルトの使用例を説明する斜視図である。It is a perspective view explaining the usage example of the bolt for formwork concerning a 1st embodiment. 図３中のＢ−Ｂ断面図である。It is BB sectional drawing in FIG. 図５（Ａ）はマルチピッチねじの転造用のダイスの側面図であり、図５（Ｂ）は、図５（Ａ）のＣ−Ｃ断面図である。FIG. 5A is a side view of a die for rolling a multi-pitch screw, and FIG. 5B is a cross-sectional view taken along the line CC in FIG. 図６（Ａ）は、マルチピッチねじの転造用のねじ山、ねじ溝を説明用に平面的に展開して示した説明図であり、図６（Ｂ）はマルチピッチねじ部の加工を模擬的に示す説明図である。FIG. 6 (A) is an explanatory diagram showing a thread and a groove for rolling of a multi-pitch screw in a plan view for explanation, and FIG. 6 (B) shows the processing of the multi-pitch screw part. It is explanatory drawing shown in simulation. 第２実施形態に係るねじ溝の形状を示す断面図である。It is sectional drawing which shows the shape of the thread groove which concerns on 2nd Embodiment. 第３実施形態に係る型枠締め付け用ボルトのマルチピッチねじ部を平面的に展開した説明図である。It is explanatory drawing which expand | deployed planarly the multi-pitch screw part of the bolt for formwork clamping which concerns on 3rd Embodiment. 図９（Ａ）は従来技術に係る型枠用ボルトを示す側面図であり、図９（Ｂ）はナットを示す斜視図である。FIG. 9A is a side view showing a conventional formwork bolt, and FIG. 9B is a perspective view showing a nut. 図９に示す型枠用ボルトとナットの係合部を示す断面図である。It is sectional drawing which shows the engaging part of the bolt for formwork shown in FIG. 9, and a nut.

符号の説明Explanation of symbols

１０ 型枠用ボルト
１２ マルチピッチねじ部
１２ｂ ねじ溝
１２ｃ ねじ山
１４ 普通ねじ部
２０ ナット
２２ ねじ孔
２２ｂ ねじ山
２２ｃ カット部 DESCRIPTION OF SYMBOLS 10 Formwork bolt 12 Multipitch thread part 12b Thread groove 12c Thread 14 Normal thread part 20 Nut 22 Screw hole 22b Thread thread 22c Cut part

Claims (6)

ねじ溝の側壁が、断面略円弧状に形成されると共に、つるまき線に沿って回転する間にリード角の緩い区間とリード角の急な区間とが交代して、交互に連続するように形成され、ねじ溝の底部に、Ｖ字状の溝部を設けたことを特徴とするマルチピッチボルト。 The side wall of the thread groove is formed in a substantially arc shape in cross section, and the section where the lead angle is loose and the section where the lead angle is steep is alternately alternated while rotating along the spiral line. A multi-pitch bolt formed and provided with a V-shaped groove at the bottom of the thread groove. 前記Ｖ字状の溝部の側壁が、前記ねじ溝の側壁の断面を構成する円弧の接線となり、且つ、前記Ｖ字状の溝部の断面が略２等辺三角形となるように形成されたことを特徴とする請求項１のマルチピッチボルト。 The side wall of the V-shaped groove part is formed so as to be a tangent to an arc constituting the cross section of the side wall of the screw groove, and the cross section of the V-shaped groove part is substantially isosceles triangle. The multi-pitch bolt according to claim 1. 前記Ｖ字状の溝部が、一定リード角に形成されていることを特徴とする請求項１又は請求項２のマルチピッチボルト。 The multi-pitch bolt according to claim 1 or 2, wherein the V-shaped groove is formed at a constant lead angle. ねじ溝の側壁が、断面略円弧状に形成されると共に、つるまき線に沿って回転する間にリード角の緩い区間とリード角の急な区間とが交代して、交互に連続するように形成され、ねじ溝の底部に、断面略半円弧状の溝部を設けたことを特徴とするマルチピッチボルト。 The side wall of the thread groove is formed in a substantially arc shape in cross section, and the section where the lead angle is loose and the section where the lead angle is steep is alternately alternated while rotating along the spiral line. A multi-pitch bolt, characterized in that a groove having a substantially semicircular cross section is provided at the bottom of the thread groove. 請求項１〜請求項４のいずれか１のマルチピッチボルトと、
ねじ山の側壁が断面略円弧状に形成されると共に、前記マルチピッチボルトのねじ溝の側壁と緩く係合するナットと、から成るマルチピッチボルト及びナット。 The multi-pitch bolt according to any one of claims 1 to 4,
A multi-pitch bolt and nut comprising: a nut having a threaded side wall formed in a substantially arcuate cross-section, and a nut that loosely engages a side wall of the thread groove of the multi-pitch bolt. 前記ナットのねじ山の頂部が平面状に形成される請求項５のマルチピッチボルト及びナット。 6. The multi-pitch bolt and nut according to claim 5, wherein the top of the screw thread of the nut is formed in a flat shape.
JP2005292349A 2005-10-05 2005-10-05 Multi-pitch bolt, multi-pitch bolt and nut Pending JP2007100858A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100966276B1 (en) * 2007-12-28 2010-06-28 김동수 Screw piece for insulating material construction
KR20190022328A (en) * 2017-08-23 2019-03-06 한동렬 Screw thread structure, bolt having the same and nut having the same

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3238985A (en) * 1963-05-09 1966-03-08 Allen F Reid Threaded devices with antirotational means
JPS6274475U (en) * 1985-10-29 1987-05-13
JPH09168924A (en) * 1996-09-17 1997-06-30 Nippon Seiko Kk Nut thread groove lapping method
JP2004041931A (en) * 2002-07-11 2004-02-12 Osg Corp Coating rod
JP2004068996A (en) * 2002-08-08 2004-03-04 Nsk Ltd Ball screw
JP2004360745A (en) * 2003-06-03 2004-12-24 Maruwa Giken:Kk Easy release type tightening screw

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3238985A (en) * 1963-05-09 1966-03-08 Allen F Reid Threaded devices with antirotational means
JPS6274475U (en) * 1985-10-29 1987-05-13
JPH09168924A (en) * 1996-09-17 1997-06-30 Nippon Seiko Kk Nut thread groove lapping method
JP2004041931A (en) * 2002-07-11 2004-02-12 Osg Corp Coating rod
JP2004068996A (en) * 2002-08-08 2004-03-04 Nsk Ltd Ball screw
JP2004360745A (en) * 2003-06-03 2004-12-24 Maruwa Giken:Kk Easy release type tightening screw

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100966276B1 (en) * 2007-12-28 2010-06-28 김동수 Screw piece for insulating material construction
KR20190022328A (en) * 2017-08-23 2019-03-06 한동렬 Screw thread structure, bolt having the same and nut having the same
KR102009665B1 (en) 2017-08-23 2019-08-13 한동렬 Screw thread structure, bolt having the same and nut having the same

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