JP6043637B2 - Nut for fitting - Google Patents

Nut for fitting Download PDF

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Publication number
JP6043637B2
JP6043637B2 JP2013013425A JP2013013425A JP6043637B2 JP 6043637 B2 JP6043637 B2 JP 6043637B2 JP 2013013425 A JP2013013425 A JP 2013013425A JP 2013013425 A JP2013013425 A JP 2013013425A JP 6043637 B2 JP6043637 B2 JP 6043637B2
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nut
groove
diameter
hook
tightening
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JP2014145396A (en
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真照 山田
真照 山田
貴之 岸本
貴之 岸本
中川 健
健 中川
清敬 大前
清敬 大前
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Nippon Pillar Packing Co Ltd
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Nippon Pillar Packing Co Ltd
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Priority to JP2013013425A priority Critical patent/JP6043637B2/en
Priority to KR1020130158501A priority patent/KR102094045B1/en
Priority to TW103100527A priority patent/TWI604149B/en
Priority to US14/162,067 priority patent/US9664325B2/en
Priority to CN201410040994.XA priority patent/CN103968163B/en
Publication of JP2014145396A publication Critical patent/JP2014145396A/en
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Description

本発明は、半導体製造や医療・医薬品製造、食品加工、化学工業等の各種技術分野の製造工程で取り扱われる高純度液や超純水の配管にも好適であって、ポンプ、バルブ、フィルタ等の流体機器や流体移送路であるチューブの接続手段としての樹脂管継手に用いられる管継手用ナットに関するものである。   The present invention is also suitable for piping of high-purity liquid and ultrapure water handled in manufacturing processes in various technical fields such as semiconductor manufacturing, medical / pharmaceutical manufacturing, food processing, chemical industry, etc., and includes pumps, valves, filters, etc. The present invention relates to a nut for a pipe joint used for a resin pipe joint as a connecting means of a tube which is a fluid device or a fluid transfer path.

この種の管継手用ナットは、例えば、特許文献1において開示されたものが知られている。即ち、嵌合筒(4)にチューブ(3)が外嵌されて拡径部(3A)を生じる状態での雌ねじ(8)と雄ねじ(5)との螺合による管継手用ナット(ユニオンナット:2)の螺進により、拡径変化領域(9)がチューブ押圧部(シール用押圧部:10)で押圧される構成の樹脂管継手が開示されている。   As this type of pipe joint nut, for example, the one disclosed in Patent Document 1 is known. That is, a nut for a pipe joint (union nut) formed by screwing a female screw (8) and a male screw (5) in a state in which the tube (3) is externally fitted to the fitting cylinder (4) to generate the enlarged diameter portion (3A). A resin pipe joint having a configuration in which the diameter expansion change region (9) is pressed by the tube pressing portion (the sealing pressing portion: 10) by the screwing of: 2) is disclosed.

特許文献1にて示されるものにおいては、樹脂管継手に用いられる管継手用ナットは、作業者が手指で握っての回し操作により締付けられるものであり、締付トルクが極力伝わり易くなるように、ナット外周には滑り止めの細かい凹凸(ギザギザ)が周方向に連続形成されていた。しかしながら、良好にシールできるように管継手用ナットを作業者の人為操作力で十分に締付けるにはかなりの力が必要であり、作業者が限定され易い面があった。   In the one shown in Patent Document 1, a nut for a pipe joint used for a resin pipe joint is tightened by a turning operation with an operator's hand gripped so that the tightening torque can be transmitted as easily as possible. The outer periphery of the nut was continuously formed with fine unevenness (notched) in the circumferential direction. However, a considerable force is required to sufficiently tighten the pipe joint nut with an operator's manipulating force so that a good seal can be obtained, and the operator is likely to be limited.

そこで、特許文献2において開示されるように、管継手用ナットを操作簡単で良好に十分締付けることができる工具も提供されている。この回転操作具である引掛けスパナは、合成樹脂製の管継手用ナットに好適となるように自身もプラスチック製とされている。この引掛けスパナを使用すれば簡単に強固な締付けが行えるので、熟練未熟を問わずに管継手用ナットの締付作業が行える利点があった。   Therefore, as disclosed in Patent Document 2, a tool that can easily and satisfactorily tighten a nut for a pipe joint is provided. The hook spanner, which is this rotary operation tool, is also made of plastic so as to be suitable for a pipe joint nut made of synthetic resin. If this hook spanner is used, strong tightening can be easily performed, and there is an advantage that the nut for pipe joint can be tightened regardless of skill.

特開2010−127427号公報JP 2010-127427 A 特開2000−354973号公報JP 2000-354773 A

ところで、管継手において、管継手用ナットの締付けによる螺進により、そのチューブ押圧部が継手本体に嵌合されているチューブを強く押付けてシールされる状態になれば、その締付作業は完了する。手指の力で管継手用ナットを締付ける手段では、チューブ押圧部がチューブを押すことによる急激なトルク増大により、締付完了状態又はその直前になったことが比較的判り易い。
これに対して、回しパワーが増幅される引掛けスパナを用いて締付ける手段では、手指で直接に操作する場合に比べて、前記トルク増大が感覚的に判り難い傾向がある。そのため、往々にして締め過ぎてしまうとか、逆に若干緩い状態で締付を終えてしまうという新たな不都合のおそれがあった。
By the way, in the pipe joint, when the tube pressing portion is pressed tightly against the tube fitted to the joint main body by screwing by tightening the pipe joint nut, the tightening operation is completed. . With the means for tightening the fitting nut with the finger, it is relatively easy to understand that the tightening has been completed or just before it due to a sudden torque increase caused by the tube pressing portion pushing the tube.
On the other hand, in the means for tightening with a hook spanner that amplifies the turning power, the increase in torque tends to be difficult to perceive in comparison with the case of direct operation with fingers. For this reason, there is a fear of a new inconvenience that the tightening is often overtightened or the tightening is finished in a slightly loose state.

前述したように、合成樹脂製の管継手は、医療・医薬品や食品といった比較的デリケートな取扱いが要求される流体の配管中に用いられており、複雑に入り組んだ配管設備中に配備されることが多い。そのため、壁際や高所に配置されたポンプとタンクとの間の箇所といった具合に、管継手は非常に狭小なスペースに配置されることが多い。
従って、上記の引掛けスパナが使える場合であっても、場所が狭くて操作し難い状況となることが多々あり、それゆえに上述した締付不良となるおそれが生じ易くなる。加えて、手指操作では存在しなかった引掛けスパナが邪魔になり、管継手用ナットの端部などの管継手の***作部が見え難くなる不利もあり、締付完了状態の把握を難しくしている。
As mentioned above, synthetic resin pipe fittings are used in fluid piping that requires relatively delicate handling, such as medicine, pharmaceuticals, and food, and should be deployed in complicated piping equipment. There are many. For this reason, the pipe joint is often arranged in a very narrow space, such as a place between a pump and a tank arranged at a wall or at a high place.
Accordingly, even when the above-described hook spanner can be used, there are many cases where the place is small and difficult to operate, and therefore, the above-described tightening failure is likely to occur. In addition, a hook spanner that did not exist in finger operation becomes an obstacle, and it is difficult to see the operated parts of the pipe joint such as the end of the pipe fitting nut, making it difficult to grasp the tightening completion state. ing.

このような実情にあるため、合成樹脂製の管継手における管継手用ナットの締付操作の容易化、確実化を図るための引掛けスパナではあるが、これを用いて管継手用ナットを回し操作する際においては、締付完了状態を認識することは却って行い難くなり易い面があった。
そこで、本発明の目的は、さらなる構造工夫により、締付作業性に優れる引掛けスパナを用いながらも締付完了状態の認識も容易に行えるようにして、より改善された管継手用
ナットを提供する点にある。
Because of this situation, it is a hook wrench for facilitating and ensuring the tightening operation of pipe fitting nuts in synthetic resin pipe fittings, but this can be used to turn pipe fitting nuts. In operation, it is difficult to recognize the tightening completion state.
Accordingly, an object of the present invention is to provide a further improved nut for a pipe joint by using a hook wrench excellent in tightening workability and easily recognizing a tightening completion state by further structural contrivance. There is in point to do.

請求項1に係る発明は、管継手用ナットにおいて、
継手本体1の雄ねじ5に螺合可能な雌ねじ9を備えるナット薄肉部2Aと、前記雌ねじ9から軸心Q方向に離れて内周部に形成されるチューブ押圧部11を備えるナット厚肉部2Bとを有し、
引掛けスパナSの爪15を係合させて強制回動することが可能な溝又は凹部12が、前記ナット厚肉部2Bの外周部に形成されるとともに、前記ナット薄肉部2Aの径外方から径内方が見通し可能となる透明度を有し、
前記溝又は凹部12が前記軸心Q方向に伸びる深溝であり、引掛けスパナSの爪15を係合させて強制回動することが不能な深さの浅い浅溝13が、前記深溝12に続く状態で前記ナット薄肉部2Aの外周部に形成されている合成樹脂製のものであることを特徴とする。
The invention according to claim 1 is a nut for a pipe joint,
Nut thin portion 2A having a nut thin portion 2A having a female screw 9 that can be screwed to the male screw 5 of the joint body 1, and a tube pressing portion 11 being formed on the inner peripheral portion away from the female screw 9 in the axial center Q direction. And
A groove or recess 12 that can be forcibly rotated by engaging the claw 15 of the hook spanner S is formed on the outer peripheral portion of the nut thick portion 2B, and the radially outer side of the nut thin portion 2A. it is radially inward to have a transparency that enables outlook from,
The groove or recess 12 is a deep groove extending in the direction of the axial center Q, and a shallow shallow groove 13 that cannot be forcibly rotated by engaging the claw 15 of the hook spanner S is formed in the deep groove 12. It is a thing made from the synthetic resin currently formed in the outer peripheral part of the said nut thin part 2A in the state which continues .

請求項2に係る発明は、請求項1に記載の管継手用ナットにおいて、
前記浅溝13が、前記引掛けスパナSの爪15を前記溝又は凹部12に導くべく当該爪15を引っ掛けることができるように形成されていることを特徴とするものである。
The invention according to claim 2 is the nut for a pipe joint according to claim 1,
The shallow groove 13 is formed so that the claw 15 can be hooked so as to guide the claw 15 of the hook spanner S to the groove or the recess 12 .

請求項3に係る発明は、請求項1又は2に記載の管継手用ナットにおいて、
前記ナット薄肉部2Aの前記軸心Q方向での端面に、前記溝又は凹部12の径方向位置と互いに合致する径方向位置を有する目印部kが形成されていることを特徴とするものである。
The invention according to claim 3 is the nut for a pipe joint according to claim 1 or 2,
A mark portion k having a radial position coinciding with the radial position of the groove or recess 12 is formed on the end surface of the nut thin portion 2A in the axial center Q direction. .

請求項4に係る発明は、請求項1〜3の何れか一項に記載の管継手用ナットにおいて、
前記雌ねじ9を前記雄ねじ5に螺合させての螺進により、前記継手本体1における前記雄ねじ5の径内側に形成される嵌合筒部4に外嵌されている合成樹脂製のチューブ3が前記チューブ押圧部11で押圧されての締付完了状態では、前記雌ねじ9と略同一長さに設定される前記雄ねじ5の軸心方向端と前記溝又は凹部12の軸心方向端との軸心方向での位置がほぼ合致する状態となるように前記溝又は凹部12が形成されていることを特徴とするものである。
The invention according to claim 4 is the nut for a pipe joint according to any one of claims 1 to 3,
A tube 3 made of synthetic resin that is externally fitted to a fitting cylinder portion 4 formed inside the male screw 5 in the joint body 1 by screwing the female screw 9 into the male screw 5. In the tightening completion state after being pressed by the tube pressing portion 11, the axis between the axial end of the male screw 5 and the axial end of the groove or recess 12 is set to approximately the same length as the female screw 9. The grooves or recesses 12 are formed so that the positions in the center direction substantially coincide with each other.

請求項1の発明によれば、内部の透視可能なナット薄肉部を備えているから、雌ねじと雄ねじとの螺合状態を透視確認しながらの締付け操作が行えるようになり、内部見通しができない場合に比べて、狭小な作業環境や入り組んだ箇所での締付完了状態であることや締付完了状態に近付いている状態などを見て確認できて作業性に優れるものとなる。
そして、引けスパナの爪が係合して回動トルクを受ける箇所である溝又は凹部が、径方向の肉厚がナット薄肉部よりも厚いナット厚肉部に形成されているので、管継手用ナットを強度十分なものにしながら小径化も行える、という合理的設計が可能となる。
その結果、さらなる構造工夫により、締付作業性に優れる引掛けスパナを用いながらも締付完了状態の認識も容易に行えるようにして、より改善された管継手用ナットを提供することができる。
According to the first aspect of the invention, since the nut thin portion that can be seen through is provided, the tightening operation can be performed while seeing through the screwed state between the female screw and the male screw, and the inside view is not possible. Compared to the above, it is possible to confirm by confirming a narrow working environment, a tightening completion state in an intricate part, a state approaching the tightening completion state, etc., and it is excellent in workability.
The grooves or recesses nail pull pawl in place spanner is locations engage undergo rotation torque, since the thickness in the radial direction is formed in a thick nut thick portion than the nut thin portion, the tube A rational design is possible in which the diameter of the joint nut can be reduced while maintaining sufficient strength.
As a result, a further improved structure can provide a more improved nut for a pipe joint by making it possible to easily recognize a tightening completion state while using a hook wrench excellent in tightening workability.

また、溝又は凹部としての深溝と、これに続く状態でナット薄肉部に形成される浅溝とを外周に有しているので、引掛けスパナの爪を浅溝に引っ掛けてのスライド移動によって爪を深溝に係合させる、という使い方が可能になる。
つまり、浅溝が、引掛けスパナの爪を深溝に導くガイド機能を発揮できて使い勝手に優れるとともに、深溝と浅溝とを一直線上に並べてデザイン性の向上を図ることも可能となる良さもある管継手用ナットを提供することができる。
例えば、管継手が狭小な箇所や見え難い場所に配置されているような場合でも、深溝のみが形成されている場合に比べて、引掛けスパナの爪を深溝に到達させることが容易化され、便利である。
Moreover , since it has a deep groove as a groove or a recess and a shallow groove formed in the thin-walled nut portion in the following state on the outer periphery, the hook is moved by sliding the hook spanner on the shallow groove. Can be used to engage the deep groove.
In other words, the shallow groove can demonstrate the guide function to guide the hook spanner claw to the deep groove and is easy to use, and it is also possible to improve the design by arranging the deep groove and the shallow groove in a straight line. A nut for a pipe joint can be provided.
For example, even when the pipe joint is arranged in a narrow place or difficult to see, compared to the case where only the deep groove is formed, it is easier to reach the hook of the hook spanner to the deep groove, Convenient.

請求項3の発明によれば、管継手用ナットの先端面には、深溝及び浅溝などの溝又は凹部と軸心に関する径方向位置を合致させた目印部が形成されているから、目印部の目視確認や手指での触診により、管継手用ナットの先端側からの引掛けスパナの爪の係合位置確認が行い易い利点がある。   According to the third aspect of the present invention, the tip portion of the nut for pipe joint is formed with a mark portion in which a radial position with respect to a groove or a concave portion such as a deep groove and a shallow groove and a shaft center is matched. There is an advantage that it is easy to confirm the engagement position of the hook spanner claw from the distal end side of the pipe joint nut by visual confirmation or palpation with fingers.

請求項4の発明によれば、締付完了状態では、雌ねじと略同一長さの雄ねじの軸心方向端と溝又は凹部の軸心方向端との軸心方向での位置がほぼ合致するように構成されているから、ナット薄肉部を見通すことで、雄ねじの軸心方向端と溝又は凹部の軸心方向端との位置関係、即ち、締付完了状態であるか否かやそれに近付いているか、といった目視確認が可能になる。従って、雄ねじの軸心方向端と溝又は凹部の軸心方向端との位置関係に基づいて締付完了状態の判断も行えてより使い勝手に優れる管継手用ナットを提供することができる。   According to the invention of claim 4, in the tightening completion state, the axial direction positions of the axial ends of the external threads having substantially the same length as the internal threads and the axial ends of the grooves or recesses are substantially matched. By looking through the thin nut portion, the positional relationship between the axial end of the male screw and the axial end of the groove or recess, i.e., whether or not it is in a tightening completed state It is possible to visually check whether or not. Therefore, it is possible to determine the tightening completion state based on the positional relationship between the axial center end of the male screw and the axial end of the groove or the recess, and it is possible to provide a pipe joint nut that is more convenient.

管接続装置を示す一部切欠きの側面図Side view of partially cut-out showing pipe connection device 継手本体の一部切欠きの側面図Side view of partly cutout of fitting body 継手本体の正面図Front view of fitting body 管継手用ナットを示し、(a)は断面図、(b)は側面図A nut for a pipe joint is shown, (a) is a sectional view, (b) is a side view. 管継手用ナットを示し、(a)は正面図、(b)は背面図A nut for a pipe joint is shown, (a) is a front view, (b) is a rear view. 管継手用ナットを示し、(a)は正面方向から見下げた斜視図、(b)は、背面方向から見下げた斜視図The nut for pipe fitting is shown, (a) is the perspective view looked down from the front direction, (b) is the perspective view looked down from the back direction 引掛けスパナを示し、(a)は正面図、(b)は側面図A hanging spanner is shown, (a) is a front view, (b) is a side view. 引掛けスパナを管継手用ナットに引っ掛け途中の状況を示す作用図Action diagram showing the situation in the middle of hooking the hook spanner on the fitting nut 引掛けスパナで管継手用ナットを回す状況の作用図Action diagram of turning pipe fitting nut with hook spanner 管継手用ナットの締付状況を示す作用図Action diagram showing tightening situation of nuts for pipe fittings 管継手用ナットの径外側から雄ねじが透視される様を示すイメージ図Image diagram showing external thread see-through from outside diameter of fitting nut 隙間ゲージを示し、(a)は正面図、(b)は側面図A gap gauge is shown, (a) is a front view, (b) is a side view. 隙間ゲージの使い方の例を示し、(a)は要部の側面図、(b)は要部の正面図An example of how to use the gap gauge is shown, (a) is a side view of the main part, (b) is a front view of the main part.

以下に、本発明による管継手用ナット(以下、ユニオンナットと称する)及びこれを用いる管接続装置(管継手)の実施の形態を、図面を参照しながら説明する。なお、継手本体1においては、トルク受部7を中央として軸心P方向で部材の各端となる方向が先端側で、その逆を基端側と定義し、ユニオンナット2においては、雌ねじ9存在側の端が先端側で、その逆を基端側と定義する。   Hereinafter, embodiments of a nut for a pipe joint according to the present invention (hereinafter referred to as a union nut) and a pipe connecting device (a pipe joint) using the nut will be described with reference to the drawings. In the joint body 1, the direction of each end of the member in the direction of the axis P with the torque receiving portion 7 as the center is defined as the distal end side, and the opposite is defined as the proximal end side. The end on the existence side is defined as the distal end side, and the opposite is defined as the proximal end side.

〔実施形態1〕
図1,図11に管接続装置Aが示されている。この管接続装置Aは、フッ素樹脂(PFA、PTFE等に代表される合成樹脂の一例)製のチューブ3を、ポンプ、バルブ等の流体機器や、異径又は同径のチューブに連通接続するものであって、半透明なフッ素樹脂(PFA、PTFE等に代表される合成樹脂の一例)製の継手本体1と、半透明なフッ素樹脂(PFA、PTFE等に代表される合成樹脂の一例)製のユニオンナット(管継手用ナット)2との2部品で構成されている。なお、図1は、ユニオンナット2を締め込んでチューブ3がシール状態で継手本体1に接続される組付状態(組付完了状態)を示している。
Embodiment 1
A pipe connection device A is shown in FIGS. This pipe connection device A is for connecting a tube 3 made of fluororesin (an example of a synthetic resin typified by PFA, PTFE, etc.) to a fluid device such as a pump or a valve, or a tube having a different diameter or the same diameter. A joint body 1 made of a translucent fluororesin (an example of a synthetic resin represented by PFA, PTFE, etc.) and a semitransparent fluororesin (an example of a synthetic resin represented by PFA, PTFE, etc.) Of union nuts (nuts for pipe fittings) 2. FIG. 1 shows an assembled state (assembled state) in which the union nut 2 is tightened and the tube 3 is connected to the joint body 1 in a sealed state.

継手本体1は、図1〜図3に示すように、例として、両端それぞれに互いに同径のチューブ3を接続可能で軸心Pを有する左右対称な筒状の部品であって、それぞれ一対の嵌合筒部4と雄ねじ5と小径胴部6、及びそれぞれ単一のトルク受部7と内部流路8とを備えて構成されている。
嵌合筒部4は、チューブ3の端部を拡径して圧入外嵌装着可能な箇所であって最も軸心P方向で突出している部分である。
雄ねじ5は、嵌合筒部4の径外側で、かつ、軸心P方向で嵌合筒部4の基端側に寄って形成される大径の台形ネジで成る部分である。
As shown in FIGS. 1 to 3, the joint body 1 is, as an example, a bilaterally symmetric cylindrical component having a shaft center P that can be connected to tubes 3 having the same diameter at both ends. The fitting cylinder part 4, the male screw 5, the small diameter body part 6, and the single torque receiving part 7 and the internal flow path 8 are provided.
The fitting cylinder portion 4 is a portion where the end portion of the tube 3 is expanded and can be press-fitted and fitted, and is the portion most protruding in the axis P direction.
The male screw 5 is a portion formed of a large-diameter trapezoidal screw that is formed on the outer side of the fitting tube portion 4 and close to the proximal end side of the fitting tube portion 4 in the axis P direction.

小径胴部6は、雄ねじ5のねじ谷5a以下の外径を有して雄ねじ5の基端に続く軸心P方向長さの短い円筒部分である。
トルク受部7は、継手本体1を回動不能に支持可能な六角ナット状の部分であって、小径胴部6に続いて両小径胴部6,6の間に形成されている部分である。
内部流路8は、継手本体1の内部を軸心P方向貫く円形のトンネルとなる部分であり、移送対象流体が流れる箇所である。
The small-diameter body portion 6 is a cylindrical portion having an outer diameter equal to or smaller than the thread valley 5 a of the male screw 5 and having a short length in the axis P direction following the base end of the male screw 5.
The torque receiving portion 7 is a hexagonal nut-like portion that can support the joint body 1 in a non-rotatable manner, and is a portion that is formed between the small diameter barrel portions 6 and 6 following the small diameter barrel portion 6. .
The internal flow path 8 is a portion that becomes a circular tunnel that penetrates the inside of the joint body 1 in the direction of the axis P, and is a location where the transfer target fluid flows.

嵌合筒部4は、チューブ3を徐々に拡径させることが可能な先窄まり状のテーパ外周面4aと、チューブ3の拡径部3Aを外嵌する直胴外周面4bと、先端側ほど大径となる状態で内周側先端に形成されるカット面4cとを有している。また、嵌合筒部4の基端側部分と雄ねじ5との径方向の間には、拡径部3Aを入れ込むための周溝mが行止り状にて形成されている。雄ねじ5の先端の軸心P方向位置は、嵌合筒部4における軸心P方向の略中央となる位置に設定されている。   The fitting cylinder portion 4 includes a tapered outer peripheral surface 4a that can gradually expand the diameter of the tube 3, a straight outer peripheral surface 4b that externally fits the expanded diameter portion 3A of the tube 3, and a distal end side. It has the cut surface 4c formed in the inner peripheral side front-end | tip in the state which becomes so large that it is large. Further, a circumferential groove m for inserting the enlarged diameter portion 3A is formed in a dead end shape between the proximal end portion of the fitting cylinder portion 4 and the male screw 5 in the radial direction. The position of the distal end of the male screw 5 in the axial center P direction is set to a position that is substantially the center of the fitting cylinder portion 4 in the axial center P direction.

小径胴部6は、周溝mの径方向幅で略中央値となる大きさの外径が付与されており、雄ねじ5の基端に形成される径差の大きな側周壁5bを介して雄ねじ5に連続されている。六角ナット状のトルク受部7は、その対向する二面間寸法(スパナやレンチが掛けられる寸法)が、小径胴部6の径より若干大きくて、かつ、周溝mの最大径よりも小さい値に設定され、望ましくは、対向する両角間寸法(最大径となる箇所)は、雄ねじ5のねじ谷5aの径よりは小さい値とされている。   The small-diameter barrel portion 6 is provided with an outer diameter having a substantially central value in the radial width of the circumferential groove m, and is externally threaded via a side circumferential wall 5b formed at the base end of the external thread 5 and having a large diameter difference. 5 is continued. The hexagonal nut-shaped torque receiving portion 7 has a size between two opposing surfaces (a size on which a spanner or a wrench can be hung) that is slightly larger than the diameter of the small-diameter barrel portion 6 and smaller than the maximum diameter of the circumferential groove m. Preferably, the dimension between the opposing corners (the place where the maximum diameter is provided) is smaller than the diameter of the thread valley 5a of the male screw 5.

ユニオンナット2は、図1,図4〜図6に示すように、ナット薄肉部2Aと、ナット厚肉部2Bと、雌ねじ9と、押え内周部10と、チューブ押圧部11と、深溝(溝又は凹部の一例)12と、浅溝13とを有しており、継手本体1より透明度に優れる材料で形成されている。
ナット薄肉部2Aは、ユニオンナット2における軸心Q方向で先端側の部分であって、その内周側には、継手本体1の雄ねじ5に螺合可能な台形ネジでなる雌ねじ9が形成され、外周側には、軸心Q方向に沿う状態で周方向の均等角度毎に形成される複数の浅溝13が形成されている。また、ナット薄肉部2Aの先端部には、浅溝13が無く平坦な外周面を持つフランジ部23が形成されている。
As shown in FIGS. 1 and 4 to 6, the union nut 2 includes a thin nut portion 2 </ b> A, a thick nut portion 2 </ b> B, a female screw 9, a presser inner peripheral portion 10, a tube pressing portion 11, and a deep groove ( An example of a groove or a recess) 12 and a shallow groove 13 are formed of a material that is more transparent than the joint body 1.
The thin nut portion 2A is a portion on the tip side in the axial center Q direction of the union nut 2, and an internal thread 9 formed of a trapezoidal screw that can be screwed into the external thread 5 of the joint body 1 is formed on the inner peripheral side thereof. On the outer peripheral side, a plurality of shallow grooves 13 are formed that are formed at equal circumferential angles in a state along the axial center Q direction. Further, a flange portion 23 having a flat outer peripheral surface without the shallow groove 13 is formed at the tip of the thin nut portion 2A.

ナット厚肉部2Bは、ユニオンナット2における軸心Q方向で基端側の部分であって、雌ねじ9から軸心Q方向に離れて内周部に形成される最小径のチューブ押圧部11と、チューブ押圧部11と雌ねじ9との軸心Q方向間に、チューブ押圧部11よりも大径で雌ねじ9よりも小径となる状態で形成される押え内周部10とを備えている。
ナット厚肉部2Bの外周側に形成される深溝12は、軸心Q方向長さが極めて短く平坦な外周面を有する状態で基端に形成される小径外周部2bと同径の底面12aを有して、軸心Q方向に沿う状態で周方向の均等角度毎に形成されている。ナット厚肉部2Bの径方向の厚みは、総じてナット薄肉部2Aの径方向の厚みよりも厚い。
The nut thick portion 2B is a portion on the proximal end side in the axial center Q direction of the union nut 2, and is a tube pressing portion 11 having a minimum diameter formed on the inner peripheral portion away from the female screw 9 in the axial center Q direction. A presser inner peripheral portion 10 is provided between the tube pressing portion 11 and the female screw 9 in the axial center Q direction so as to be larger in diameter than the tube pressing portion 11 and smaller in diameter than the female screw 9.
The deep groove 12 formed on the outer peripheral side of the thick nut portion 2B has a bottom surface 12a having the same diameter as the small-diameter outer peripheral portion 2b formed at the base end in a state where the axial center Q direction length is extremely short and has a flat outer peripheral surface. And formed at every equal angle in the circumferential direction in a state along the axial center Q direction. The radial thickness of the nut thick part 2B is generally thicker than the radial thickness of the nut thin part 2A.

深溝12は、引掛けスパナSにより、その爪15を係合させて締込み側及び緩み側の双方に強制回動されることが可能となるように、比較的深い深さを有する断面矩形の溝であり(図10参照)、これら各深溝12に軸心Q方向で連続する状態で複数の浅溝13が形成されている。つまり、深溝12と浅溝13とは互いに同数(8箇所)であり、浅溝13は、引掛けスパナSの爪15を係合させて強制回動することが不能となるように、浅い深さを有する断面矩形の溝としてナット薄肉部2Aの外周に形成されている。   The deep groove 12 has a rectangular cross section having a relatively deep depth so that the hook 15 is engaged with the claw 15 by the hook spanner S and can be forcedly rotated to both the tightening side and the loose side. It is a groove | channel (refer FIG. 10), and the several shallow groove | channel 13 is formed in the state which continues in the axial center Q direction to each of these deep grooves 12. FIG. That is, the number of the deep grooves 12 and the shallow grooves 13 is the same number (eight locations), and the shallow grooves 13 are shallow and deep so that the claws 15 of the hook spanner S cannot be engaged and forcedly rotated. It is formed in the outer periphery of the nut thin part 2A as a groove having a rectangular cross section.

ナット厚肉部2Bの内周側に形成されるチューブ押圧部11は、図1に示す組付状態において、チューブ3における拡径されている部分である拡径部3Aと拡径されていない部分である自然径部3Cとの間の径変化部3Bを軸心P(軸心Q)方向に押すことが可能な部分である。チューブ押圧部11の内径は、ほぼ自然径部3Cの径と略等しい値に設定されており、チューブ押圧部11の基端側には、僅かに径の大きいガイド筒部14が形成されている。
ユニオンナット2の締込みにより、チューブ押圧部11の押圧面11aは軸心Qに直交する側周面とされ、径変化部3Bにおける径の小さい側を軸心P方向に強く押し、径変化部3Bとテーパ外周面4aとを密着させての良好なシール状態を得ることが可能である。
押え内周部10は、図1に示す組付状態において、嵌合筒部4に圧入外嵌されている拡径部3Aの外周に密接する程度の値で径一定な筒部に形成されている。
The tube pressing portion 11 formed on the inner peripheral side of the nut thick portion 2B has a diameter-expanded portion 3A that is a diameter-expanded portion in the tube 3 in the assembled state shown in FIG. This is a portion that can push the diameter changing portion 3B between itself and the natural diameter portion 3C in the direction of the axis P (axis Q). The inner diameter of the tube pressing portion 11 is set to a value substantially equal to the diameter of the natural diameter portion 3 </ b> C, and a guide cylinder portion 14 having a slightly larger diameter is formed on the proximal end side of the tube pressing portion 11. .
By tightening the union nut 2, the pressing surface 11 a of the tube pressing portion 11 becomes a side peripheral surface orthogonal to the shaft center Q, and the small diameter side of the diameter changing portion 3 </ b> B is strongly pressed in the shaft center P direction. It is possible to obtain a good sealing state by bringing 3B and the taper outer peripheral surface 4a into close contact with each other.
In the assembled state shown in FIG. 1, the presser inner peripheral portion 10 is formed in a cylindrical portion having a constant diameter with a value close to the outer periphery of the enlarged diameter portion 3 </ b> A that is press-fitted into the fitting cylindrical portion 4. Yes.

また、図5,図6に示すように、ナット薄肉部2Aの軸心Q方向での端面である先端面2aに、深溝12(及び浅溝13)の径方向位置と互いに合致する径方向位置を有する目印部kが計8箇所に形成されている。目印部kは、先端面2aの内周側に開口して軸心Q方向視形状が矩形を呈する凹みで形成されている。   Further, as shown in FIGS. 5 and 6, the radial position that coincides with the radial position of the deep groove 12 (and the shallow groove 13) on the distal end surface 2 a that is the end surface in the axial center Q direction of the thin nut portion 2 </ b> A. The mark part k which has is formed in a total of eight places. The mark portion k is formed as a recess that opens to the inner peripheral side of the distal end surface 2a and has a rectangular shape when viewed from the axial center Q direction.

チューブ3の端部を嵌合筒部4に外嵌挿入するには、常温下で強制的にチューブ3を押し込んで拡径させて装着するか、熱源を用いて暖めて変形し易いようにしてから押し込むか、或いは拡径器(図示省略)を用いて予めチューブ3の端部を拡径させておいてから嵌合筒部4に押し込むかする。
そして、図1に示すように、チューブ3の端面3tが周溝mのほぼ奥まで入り込む状態となるまで差し込む。ここで、嵌合筒部4に外嵌装着される「チューブ3の端部」とは、直胴外周面4bに外嵌される拡径部3Aと、テーパ外周面4aに外嵌される径変化部3Bとで成る部分のことである。
なお、チューブ3の内部流路3Wの径と、継手本体1の内部流路8の径とは、円滑な流体の流れとすべく互いに同径又はほぼ同径に設定されているが、互いに異なっていても良い。
In order to externally insert the end of the tube 3 into the fitting tube portion 4, the tube 3 is forcedly pushed in at normal temperature to increase the diameter, or it is warmed using a heat source so as to be easily deformed. Or the diameter of the end of the tube 3 is increased in advance using a diameter expander (not shown) and then the tube 3 is pushed into the fitting cylinder 4.
And as shown in FIG. 1, it inserts until the end surface 3t of the tube 3 will be in the state which penetrates into the substantially back of the circumferential groove m. Here, the “end portion of the tube 3” that is externally fitted to the fitting cylinder portion 4 is an enlarged diameter portion 3A that is externally fitted to the straight barrel outer peripheral surface 4b and a diameter that is externally fitted to the tapered outer peripheral surface 4a. It is a part composed of the change part 3B.
Note that the diameter of the internal flow path 3W of the tube 3 and the diameter of the internal flow path 8 of the joint body 1 are set to be the same diameter or substantially the same diameter for smooth fluid flow, but are different from each other. May be.

つまり、図1に示すように、嵌合筒部4にチューブ3が外嵌装着された状態における雌ねじ9を雄ねじ5に螺合させてのユニオンナット2の締込みによる軸心P方向への螺進により、径変化部3Bがチューブ押圧部11で軸心P方向に押され、かつ、拡径部3Aに押え内周部10が外嵌されるように設定されている。
加えて、ユニオンナット2の先端面2aと継手本体1の側周壁5bとが軸心P方向で合致するとき(図1に示す状態)が、チューブ押圧部11で押される径変化部3Bとテーパ外周面4aとが密着して良好にシールされる組付完了状態となるように設定されている。なお、「合致する」は、「端面が揃う」とか「面一となる」と置き換えても良い。
In other words, as shown in FIG. 1, the screw 9 is screwed in the direction of the axis P by tightening the union nut 2 by screwing the female screw 9 with the male screw 5 in a state where the tube 3 is externally fitted to the fitting cylinder portion 4. As a result, the diameter changing portion 3B is pushed in the direction of the axis P by the tube pressing portion 11, and the presser inner peripheral portion 10 is externally fitted to the enlarged diameter portion 3A.
In addition, when the distal end surface 2a of the union nut 2 and the side peripheral wall 5b of the joint body 1 coincide with each other in the direction of the axis P (the state shown in FIG. 1), the diameter changing portion 3B pushed by the tube pushing portion 11 and the taper. It is set so as to be in an assembly completed state in which the outer peripheral surface 4a is in close contact and is well sealed. “Match” may be replaced with “align end faces” or “equal”.

さて、ユニオンナット2を強制回動して締付ける作業は、図7に示す引掛けスパナSを用いて行う。引掛けスパナSは、約180度湾曲した鉤状の先端部16、手指で握る柄部17、先端部16の内周側に形成される3箇所の爪15とを備える合成樹脂製のナット回し工具である。三箇所の爪15は、ユニオンナット2における周方向に連続した3箇所の深溝12に丁度係合できる離間角度及び大きさ・形状に設定されている。
各爪15の回し方向上手側となる麓には、深溝12との確実な係合を図るための凹入部18が形成されている。
Now, the operation of forcibly turning and tightening the union nut 2 is performed using a hook spanner S shown in FIG. The hook spanner S is a synthetic resin nut turning provided with a bowl-shaped tip 16 curved by about 180 degrees, a handle 17 gripped with fingers, and three claws 15 formed on the inner peripheral side of the tip 16. It is a tool. The three claws 15 are set to have a separation angle, size, and shape that can be just engaged with three deep grooves 12 that are continuous in the circumferential direction of the union nut 2.
A recessed portion 18 is formed on the heel on the upper side in the direction of rotation of each claw 15 so as to be surely engaged with the deep groove 12.

引掛けスパナSを用いてユニオンナット2を回すには、まず、図8に示すように、先ず、最先端の爪15をナット厚肉部2Bのいずれかの深溝12に入れ込み、それから、手指(図示省略)で握っている柄部17を操作して、先端部16がユニオンナット2に近付く方向に回動移動させる。
すると、図9に示すように、3箇所の爪のそれぞれが、対応する各深溝12に正規に入り込んだ操作可能状態になる。それから、柄部17を握る手指(図示省略)に力を入れて矢印R方向に動かせば、ユニオンナット2を強制回動して締付けることができる。
In order to turn the union nut 2 using the hook spanner S, first, as shown in FIG. 8, first, the most advanced claw 15 is inserted into one of the deep grooves 12 of the nut thick part 2B, and then the finger ( The handle 17 gripped in (not shown) is operated to rotate the tip 16 in a direction approaching the union nut 2.
Then, as shown in FIG. 9, each of the three claws is in an operable state in which it normally enters the corresponding deep groove 12. Then, if force is applied to fingers (not shown) that grip the handle portion 17 and moved in the direction of arrow R, the union nut 2 can be forcibly rotated and tightened.

次に、検査治具Tについて説明する。この管接続装置Aにおいては、経時によるユニオンナット2の増し締め時における増し締め完了状態の検査が可能な検査治具Tを伴う場合がある。検査治具Tは、図12に示すように、二股に分かれた検査部19,19と把持部20とを有する略U字形状を呈する合成樹脂製で板状のものに形成されている。各検査部19は、把持部20と同じ厚さの基端検査部19aと、基端検査部19aよりも厚みが若干小さい先端検査部19bとを備えており、図12(b)に示されるように、側面視では段付形状の部品に形成されている。   Next, the inspection jig T will be described. In this pipe connection device A, there is a case in which an inspection jig T capable of inspecting the completion state of additional tightening at the time of additional tightening of the union nut 2 with time is accompanied. As shown in FIG. 12, the inspection jig T is formed in a plate shape made of a synthetic resin having a substantially U shape having inspection portions 19 and 19 and a grip portion 20 which are divided into two portions. Each inspection section 19 includes a proximal end inspection section 19a having the same thickness as the gripping section 20 and a distal end inspection section 19b having a thickness slightly smaller than that of the proximal end inspection section 19a, as shown in FIG. Thus, it is formed in the step-shaped component in side view.

検査治具Tの使い方の例としては、図13に示すように、一対の検査部19,19を、その段の無い平坦面21がユニオンナット2の先端面2aに向く姿勢で小径胴部6に差し込みを開始し、段のある段付面22の段面22aがトルク受部7に当接するまで検査治具Tを差し込む。その状態でトルク受部7と先端面2aとの間に隙間なく先端検査部19bが挟まれておれば、増し締め完了状態であることを認識することができる、というものである。なお、平坦面21がトルク受部7に向く使い方も可能である。
即ち、検査治具Tにおける先端検査部19bの厚みが、締付完了状態(図1,図11参照)からさらにユニオンナット2が所定量締付方向に回動された増し締め状態(増し締め完了状態)でのユニオンナット2の先端面(先端の一例)2aとトルク受部7との間の間隙寸法に合致されているのである。
As an example of how to use the inspection jig T, as shown in FIG. 13, the pair of inspection parts 19, 19 are arranged such that the stepless flat surface 21 faces the distal end surface 2 a of the union nut 2 and the small diameter body part 6. The inspection jig T is inserted until the stepped surface 22 a of the stepped stepped surface 22 abuts against the torque receiving portion 7. In this state, if the tip inspection portion 19b is sandwiched between the torque receiving portion 7 and the tip end surface 2a without any gap, it can be recognized that the tightening has been completed. In addition, the usage which the flat surface 21 faces the torque receiving part 7 is also possible.
That is, the thickness of the tip inspection portion 19b in the inspection jig T is the tightening state (the tightening is completed) when the union nut 2 is further rotated in the tightening direction by a predetermined amount from the tightening completion state (see FIGS. 1 and 11). The gap dimension between the tip surface (an example of the tip) 2a of the union nut 2 and the torque receiving portion 7 in the state) is matched.

一方、検査治具Tを用いて、管接続装置Aの締付完了状態であるか否かの検査を行うこともできる。即ち、図10の紙面右側の管接続装置Aにて仮想線にて描かれているように、トルク受部7と先端面2aとの間に隙間なく基端検査部19aが差し込まれる状態であれば、側周壁5bと先端面2aとが軸心P,Q方向で互いに同一面となる締付状態(締付完了状態)であることが認識できる。   On the other hand, it is also possible to inspect whether or not the pipe connection device A is in the tightening completion state using the inspection jig T. That is, as shown by the phantom line in the pipe connection device A on the right side of FIG. 10, the proximal end inspection portion 19a is inserted without a gap between the torque receiving portion 7 and the distal end surface 2a. For example, it can be recognized that the side peripheral wall 5b and the front end surface 2a are in a tightening state (tightening complete state) in which the side surfaces 5a and the front end surface 2a are flush with each other in the directions of the axes P and Q.

〔作用や効果などについて〕
(1) 図4〜図6に示すように、透視可能なユニオンナット2を用いてあるので、雌ねじ9と雄ねじ5との螺合状態を透視確認しながら締付け操作が行え、内部見通しができない場合に比べて、狭小な作業環境や入り組んだ箇所での締付完了状態であることや締付完了状態に近付いている状態などを見て確認できて作業性に優れるものとなる。そして、径方向の肉厚がナット薄肉部2Aよりも厚いナット厚肉部2Bに深溝12が形成されるので、ユニオンナット2を強度十分なものにしながらも小径化が行える、という合理的設計が可能となっている。
[About actions and effects]
(1) When the see-through union nut 2 is used as shown in FIGS. 4 to 6, the tightening operation can be performed while seeing through the screwed state of the female screw 9 and the male screw 5, and the inside view is not possible. Compared to the above, it is possible to confirm by confirming a narrow working environment, a tightening completion state in an intricate part, a state approaching the tightening completion state, etc., and it is excellent in workability. And since the deep groove 12 is formed in the nut thick part 2B whose thickness in the radial direction is thicker than the nut thin part 2A, the rational design that the diameter can be reduced while making the union nut 2 sufficient in strength. It is possible.

(2) さて、管接続装置Aにおいては、図1に示すように、雌ねじ9と雄ねじ5とを螺合させてのユニオンナット2の螺進によりチューブ押圧部11が径変化部3Bを押圧する締付完了状態では、雄ねじ5の基端、即ち側周壁5bとユニオンナット2の先端、即ち先端面2aとの互いの軸心P(Q)方向位置が合致する構成とされている。
故に、図10に示すように、軸心Pに交差する方向視において、回動操作して締付けているユニオンナット2の先端面2aと継手本体1の側周壁5bとが合致して、それまで目視できていた雄ねじ5が見えなくなる状態(図10の紙面右側に描かれている状態)になればユニオンナット2の回し操作を止めればよく、丁度そのときが組付完了状態となっているのである。
従って、図11に示すように、軸心P方向に直交する方向である矢印イ方向の目視により、先端面2aと側周壁5bとが合致しているか否か、即ち、組付け完了状態であるか否かを容易に確認することができる。
(2) Now, in the pipe connection device A, as shown in FIG. 1, the tube pressing portion 11 presses the diameter changing portion 3B by the union nut 2 being screwed together with the female screw 9 and the male screw 5. In the tightening completed state, the base end of the male screw 5, that is, the side peripheral wall 5b, and the distal end of the union nut 2, that is, the distal end surface 2a are aligned with each other in the axial center P (Q) direction.
Therefore, as shown in FIG. 10, when viewed from the direction intersecting the axis P, the tip end surface 2 a of the union nut 2 that is turned by tightening and the side peripheral wall 5 b of the joint body 1 coincide with each other. If the male screw 5 that was visible can no longer be seen (the state depicted on the right side of the paper in FIG. 10), the union nut 2 can be turned and the assembly is complete. is there.
Therefore, as shown in FIG. 11, whether or not the front end surface 2a and the side peripheral wall 5b are in agreement by visual observation in the direction of the arrow A, which is a direction orthogonal to the direction of the axis P, that is, the assembly is completed. It can be easily confirmed whether or not.

(3) また、図11に示されるように、管接続装置Aの締付完了状態では、雌ねじ9と略同一長さに設定される雄ねじ5の軸心P方向端と、深溝12の軸心Q方向端との軸心(P,Q)方向での位置がほぼ合致する状態となるように深溝12が形成されている。従って、図11に示すように、例えば、斜め方向からの矢印ロ方向の目視により、半透明のユニオンナット2、詳しくはナット薄肉部2Aを見通して、深溝12の先端(深溝12と浅溝13との境目)と雄ねじ5の先端5cとが合致又はほぼ合致しているか否かを見分けることができ、従って、組付け完了状態であるか否かの確認が可能となる。
例えば、矢印イ方向の目視ができないような場合にも有効な視認手段であるとともに、引掛けスパナSをユニオンナット2に係合させた操作状態であっても行えることが可能になる、という優れものである。
(3) Also, as shown in FIG. 11, when the pipe connecting device A is completely tightened, the axial center P direction end of the male screw 5 set to approximately the same length as the female screw 9 and the axial center of the deep groove 12. The deep groove 12 is formed so that the position in the axial center (P, Q) direction with the end in the Q direction substantially matches. Therefore, as shown in FIG. 11, for example, by visually observing the direction of the arrow B from the oblique direction, the tip of the deep groove 12 (the deep groove 12 and the shallow groove 13 is viewed through the translucent union nut 2, specifically, the nut thin portion 2 </ b> A. ) And the tip 5c of the male screw 5 can be discriminated or almost matched, and therefore it is possible to confirm whether or not the assembly is complete.
For example, it is an effective visual means even when visual observation in the direction of the arrow A is not possible, and it can be performed even in an operation state in which the hook spanner S is engaged with the union nut 2. Is.

(4) 図4〜図6,図11などに示すように、ユニオンナット2の外周には、深溝12に続けて浅溝13が形成されているので、爪15を浅溝13に引っ掛けてスライド移動させれば爪15を簡単に深溝12に係合さえての回動操作状態を得ることができる。つまり、浅溝13は、引掛けスパナSの爪15を深溝12に導くガイドとして機能させることが可能であるとともに、深溝12と浅溝13とが一直線上に並ぶことでデザイン性の向上にも寄与している。例えば、管接続装置Aが狭小な箇所や見えにくい場所に配置されているような場合でも、深溝12のみが形成されている場合に比べて、容易に引掛けスパナSを使うことができて便利である。 (4) As shown in FIGS. 4 to 6, 11, and the like, the outer periphery of the union nut 2 is formed with a shallow groove 13 following the deep groove 12, so that the pawl 15 is hooked on the shallow groove 13 and slides. If the claw 15 is moved, a rotation operation state can be obtained by simply engaging the claw 15 with the deep groove 12. That is, the shallow groove 13 can function as a guide that guides the pawl 15 of the hook spanner S to the deep groove 12, and the deep groove 12 and the shallow groove 13 are arranged in a straight line to improve design. Has contributed. For example, even when the pipe connection device A is arranged in a narrow place or a place where it is difficult to see, the hook spanner S can be used more easily than when only the deep groove 12 is formed. It is.

(5) 図4〜図6に示すように、ユニオンナット2の先端面2aには、深溝12及び浅溝13と軸心Qに関する径方向位置を合致させた目印部kが形成されている。従って、その目印部kの目視確認や手指での触診により、ユニオンナット2の先端側(ナット背面側)からの引掛けスパナSの爪15の係合位置確認が行い易い利点がある。 (5) As shown in FIGS. 4 to 6, a mark portion k is formed on the distal end surface 2 a of the union nut 2 so that the deep grooves 12, the shallow grooves 13, and the radial positions with respect to the axis Q are matched. Therefore, there is an advantage that it is easy to confirm the engagement position of the claw 15 of the hook spanner S from the distal end side (the nut back side) of the union nut 2 by visual confirmation of the mark portion k or palpation with fingers.

(6) 図1や図3に示すように、雄ねじ5のねじ谷5a以下の外径を有する小径胴部6と、ねじ谷5aの径以下で、かつ、小径胴部6の径以上となる値に設定される状態で小径胴部6に連続形成されるトルク受部7とを備えている。これにより、小径胴部6やトルク受部7に必要となる強度を持たせながら、雄ねじ5の基端、即ち側周壁5bとユニオンナット2の先端面2aとの軸心P,Q方向位置が合致したことを斜めから目視確認せざるを得ない状況が生じても、図11に矢印ハで示すように、小径のトルク受部7が邪魔にならず視認し易く、従って、締付作業性が良いものとなる。 (6) As shown in FIG. 1 and FIG. 3, the small diameter body 6 having an outer diameter equal to or smaller than the thread valley 5 a of the male screw 5, the diameter of the thread valley 5 a or less, and equal to or larger than the diameter of the small diameter body 6. And a torque receiving portion 7 continuously formed on the small diameter barrel portion 6 in a state where the value is set. Thereby, while giving the strength required for the small-diameter body 6 and the torque receiving portion 7, the positions of the axial ends P and Q of the base end of the male screw 5, that is, the side peripheral wall 5 b and the distal end surface 2 a of the union nut 2 are adjusted. Even if there is a situation in which it is necessary to visually confirm that they match, the torque receiving portion 7 having a small diameter is not obstructed and is easily visible as shown by an arrow C in FIG. Will be good.

(7) 図1や図4に示すように、継手本体1の雄ねじ5、及びユニオンナット2の雌ねじ9が台形ねじで形成されているので、一般的なねじ(例:メートルねじ)に比べて、ねじ山の幅やピッチが大きくてねじが視認し易いものとなっている。それゆえ、図10に示すように、ユニオンナット2の螺進によって雄ねじ5がユニオンナット2内に螺入されて次第に隠れて行く様が目視確認し易い利点があり、締付作業性が良い。また、ねじ山(ねじ条)の強度を高くできるので、合成樹脂などの金属に比べて比較的弱いとされる材料での作製にも好適である。 (7) As shown in FIG. 1 and FIG. 4, the male screw 5 of the joint body 1 and the female screw 9 of the union nut 2 are formed of trapezoidal screws, so that compared to general screws (example: metric screws) The thread width and pitch are large and the screw is easy to visually recognize. Therefore, as shown in FIG. 10, there is an advantage that it is easy to visually confirm that the male screw 5 is screwed into the union nut 2 by the union nut 2 and is gradually hidden, and the tightening workability is good. Further, since the strength of the thread (thread) can be increased, it is also suitable for production with a material that is relatively weak compared to a metal such as a synthetic resin.

(8) 図13に示すように、ユニオンナット2の先端面2aとトルク受部7との間に差込み可能な検査治具Tを有し、検査治具Tの先端検査部19bの厚みが、締付完了状態からさらにユニオンナット2が所定量締付方向に回動された増し締め状態での先端面2aとトルク受部7との間の間隙寸法に合致させてある。これにより、ユニオンナット2の先端面2aとトルク受部7との間に検査治具Tを差し込むだけの簡単な操作で、増し締めが完了したことや正規の増し締め量であることを容易にチェックすることができる。 (8) As shown in FIG. 13, it has the test | inspection jig T which can be inserted between the front end surface 2a of the union nut 2, and the torque receiving part 7, and the thickness of the front end test | inspection part 19b of the test | inspection jig T is as follows. The union nut 2 is further matched with the gap dimension between the tip surface 2a and the torque receiving portion 7 in the retightened state in which the union nut 2 is rotated in the tightening direction by a predetermined amount from the tightened state. Thereby, it is easy to confirm that the retightening is completed or the amount of the regular retightening is a simple operation by simply inserting the inspection jig T between the tip surface 2a of the union nut 2 and the torque receiving portion 7. Can be checked.

〔別実施形態など〕
溝又は凹部としては、深溝12のほか、穴状の凹みや、トルク掛り方向の力を受けること可能な壁面を有して径方向に突出した突起部でも良く、要は引掛けスパナSの爪15との係合が可能なものであれば良い。なお、突起部を設ける場合では、その突起部の爪15引掛かり側は片凹状の形状、即ち、「溝又は凹部」を呈することとなる。
また、浅溝13の無いユニオンナット2や、目印部kを有さないユニオンナットでも良い。
[Other embodiments, etc.]
The groove or recess may be a deep groove 12, a hole-like recess, or a protrusion protruding in the radial direction having a wall surface capable of receiving a force in the direction of torque. What is necessary is just to be able to engage with 15. In the case where the protrusion is provided, the hook 15 side of the protrusion has a one-sided shape, that is, a “groove or recess”.
Moreover, the union nut 2 without the shallow groove | channel 13 and the union nut which does not have the mark part k may be sufficient.

ユニオンナット2の外周面における先端面2aから基端側に所定距離離れた位置に、刻印、突起、凹みなどの外観認識容易なマーキング部を設けても良い。例えば、前記所定距離を、雄ねじ5の軸心P方向長さと同一に設定すれば、ユニオンナット2を見通しての雄ねじ5の先端壁面5cとの合致視認が容易化することが可能である。管接続装置としては、例えば、エルボ、チーズなど、ユニオン以外の形状であっても良い。   A marking portion such as a stamp, a protrusion, or a dent that can be easily recognized in appearance may be provided at a position a predetermined distance away from the distal end surface 2a on the outer peripheral surface of the union nut 2. For example, if the predetermined distance is set to be the same as the length of the male screw 5 in the direction of the axis P, it is possible to facilitate visual recognition of the match with the tip wall surface 5c of the male screw 5 when looking at the union nut 2. As a pipe connection apparatus, shapes other than union, such as elbow and cheese, may be sufficient, for example.

1 継手本体
2A ナット薄肉部
2B ナット厚肉部
3 チューブ
4 嵌合筒部
5 雄ねじ
9 雌ねじ
11 チューブ押圧部
12 溝又は凹部(深溝)
13 浅溝
15 爪
Q 軸心
S 引掛けスパナ
k 目印部
DESCRIPTION OF SYMBOLS 1 Joint main body 2A Nut thin part 2B Nut thick part 3 Tube 4 Fitting cylinder part 5 Male screw 9 Female screw 11 Tube pressing part 12 Groove or recessed part (deep groove)
13 shallow groove 15 nail Q axis S hook hook spanner k mark

Claims (4)

継手本体の雄ねじに螺合可能な雌ねじを備えるナット薄肉部と、前記雌ねじから軸心方向に離れて内周部に形成されるチューブ押圧部を備えるナット厚肉部とを有し、
引掛けスパナの爪を係合させて強制回動することが可能な溝又は凹部が、前記ナット厚肉部の外周部に形成されるとともに、前記ナット薄肉部の径外方から径内方が見通し可能となる透明度を有し、
前記溝又は凹部が前記軸心方向に伸びる深溝であり、引掛けスパナの爪を係合させて強制回動することが不能な深さの浅い浅溝が、前記深溝に続く状態で前記ナット薄肉部の外周部に形成されている合成樹脂製の管継手用ナット。
A nut thin portion including a female screw that can be screwed to the male screw of the joint main body, and a nut thick portion including a tube pressing portion formed in an inner peripheral portion away from the female screw in the axial direction,
A groove or recess capable of forcibly turning by engaging a hook spanner claw is formed in the outer peripheral portion of the nut thick portion, and the radially inner side from the outer diameter of the nut thin portion. have a prospect can become transparency,
The groove or recess is a deep groove extending in the axial direction, and a shallow shallow groove having a depth that cannot be forcibly rotated by engaging a hook spanner claw, A nut for pipe joint made of synthetic resin formed on the outer periphery of the part .
前記浅溝が、前記引掛けスパナの爪を前記溝又は凹部に導くべく当該爪を引っ掛けることができるように形成されている請求項1に記載の管継手用ナット。 The pipe coupling nut according to claim 1, wherein the shallow groove is formed so that the hook of the hook spanner can be hooked to guide the hook of the hook spanner to the groove or the recess . 前記ナット薄肉部の前記軸心方向での端面に、前記溝又は凹部の径方向位置と互いに合致する径方向位置を有する目印部が形成されている請求項1又は2に記載の管継手用ナット。   The pipe joint nut according to claim 1 or 2, wherein a mark portion having a radial position that coincides with a radial position of the groove or the recess is formed on an end surface in the axial direction of the nut thin portion. . 前記雌ねじを前記雄ねじに螺合させての螺進により、前記継手本体における前記雄ねじの径内側に形成される嵌合筒部に外嵌されている合成樹脂製のチューブが前記チューブ押圧部で押圧されての締付完了状態では、前記雌ねじと略同一長さに設定される前記雄ねじの軸心方向端と前記溝又は凹部の軸心方向端との軸心方向での位置がほぼ合致する状態となるように前記溝又は凹部が形成されている請求項1〜3の何れか一項に記載の管継手用ナット。 By screwing the female screw into the male screw, a tube made of a synthetic resin that is externally fitted to a fitting tube portion formed inside the male screw in the joint body is pressed by the tube pressing portion. the completion status tightening is substantially matched positions in the axial direction of the axial end of the internal thread and the substantially the same length axial direction end of the Flip ne male set in of the groove or recess The nut for pipe fittings as described in any one of Claims 1-3 in which the said groove | channel or the recessed part is formed so that it may be in the state to do.
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TW103100527A TWI604149B (en) 2013-01-28 2014-01-07 Pipe connection device
US14/162,067 US9664325B2 (en) 2013-01-28 2014-01-23 Pipe connecting device with fastening completion structure
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