JP2011089598A

JP2011089598A - Joint

Info

Publication number: JP2011089598A
Application number: JP2009243988A
Authority: JP
Inventors: Kazunori Mito; 和憲水戸; Yoshinao Tsutsumi; 義尚堤; Masaya Iwasaki; 雅也岩崎; Masahiro Yamada; 雅大山田; Masanori Ito; 雅則伊藤
Original assignee: Mitsui Chemicals Industrial Products Ltd
Current assignee: Mitsui Chemicals Industrial Products Ltd
Priority date: 2009-10-23
Filing date: 2009-10-23
Publication date: 2011-05-06

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate attachment of a c-ring to a cap nut in a union joint having a nipple, a union flange insert-molded on a resin joint, the union cap nut attached to the union flange and screwed into the nipple, and the c ring fitted to an inner peripheral groove of the cap nut and locking the cap nut. <P>SOLUTION: In the cap nut 12, an opening part 18 on a side to which the union flange 11 is fitted has a diameter gradually enlarged toward an opening end and is formed in a tapered shape, and the inner peripheral groove 19 is formed on an inner side of the opening part 18. When the union flange 11 and the cap nut 12 are installed, the c-ring 13 is attached to the opening part 18 of the cap nut 12, and after that, one of the union flange 11 and the cap nut 12 is pushed into the other. When the c-ring 13 is pushed into the opening part 18 in a step 16, the c-ring 13 goes to the inner side while being reduced in the diameter. Then, the c-ring 13 reaches the inner peripheral groove 19, and is fitted to the inner peripheral groove 19, and is enlarged, and is fixed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、例えばガス管、上下水道官、スチーム管等の配管設備において、管同士や管と流体機器の接続口など（明細書中、配管の管端部や流体機器の接続口等を単に管状部ということがある）を接続する際に用いる継手に関し、ことに固定継手部材と該固定継手部材に抜け止めされて回転可能に取付けられる可動継手部材とよりなる継手に関する。 The present invention, for example, in piping equipment such as gas pipes, water and sewage officers, steam pipes, etc., between pipes, pipes and connection ports of fluid equipment (in the specification, pipe ends of pipes, connection ports of fluid equipment, etc. In particular, the present invention relates to a joint including a fixed joint member and a movable joint member that is secured to the fixed joint member and is rotatably attached thereto.

固定継手部材と可動継手部材を備えた継手の一つにユニオン継手がある。
図１は、特許文献１に開示されるこの種ユニオン継手の一例を示すもので、管端部又は該管端部と継手を介して連結されるニップル１と、管状部に連結されるか又は図示するように樹脂製の継手２にインサート成型される固定継手部材としてのユニオン鍔３と、ユニオン鍔３に鍔により抜け止めされて回転可能に装着される可動継手部材としての袋ナット４とより構成され、ユニオン鍔３に抜け止めされて回転可能に取付けられる袋ナット４をニップル１に捩じ込むことによりニップル１とユニオン鍔３との連結が行われるようになっている。図中、５はニップル１とユニオン鍔３との間をシールするｏリングである。 One of the joints provided with a fixed joint member and a movable joint member is a union joint.
FIG. 1 shows an example of this kind of union joint disclosed in Patent Document 1, and is connected to a pipe end or a nipple 1 connected to the pipe end via a joint and a tubular part. As shown in the figure, a union rod 3 as a fixed joint member that is insert-molded into a resin joint 2 and a cap nut 4 as a movable joint member that is secured to the union rod 3 by a collar and rotatably mounted. The nipple 1 and the union rod 3 are connected by screwing into the nipple 1 a cap nut 4 that is configured and is secured to the union rod 3 and is rotatably mounted. In the figure, 5 is an o-ring that seals between the nipple 1 and the union rod 3.

ユニオン継手では、ユニオン鍔に袋ナットを抜け止めし、袋ナットによる締結を行うためにフランジないし鍔が形成され、袋ナットはユニオン鍔に鍔のない側（図１の右方向）から挿入して装着されるが、図１に示すようにユニオン鍔３が継手２にインサート成形されるか、或いはユニオン鍔３に径大部が形成される場合、鍔や継手又は径大部の存在により袋ナット４をユニオン鍔２に取付けることができない。 In the union joint, a cap or nut is formed in order to prevent the cap nut from being pulled out from the union cage and to be fastened by the cap nut. The cap nut is inserted from the side of the union cage that has no flange (right direction in FIG. 1). 1, when the union rod 3 is insert-molded into the joint 2 as shown in FIG. 1 or when the large diameter portion is formed in the union rod 3, the cap nut is caused by the presence of the collar, the joint, or the large diameter portion. 4 cannot be attached to the union 鍔 2.

図２に示されるように、固定継手部材としてのユニオン鍔７に可動継手部材としての袋ナット８を通すことができない径大部７ａが形成されている場合、ユニオン鍔７は袋ナット８に一方の側（図２の上方向）から押し込められ、袋ナット８の抜け止めのため袋ナット８の内周溝にはユニオン鍔７の段７ｂに係止するｃリング９が取付けられている。この場合、ユニオン鍔７は袋ナット８の内周溝にｃリング９を装着したのち押し嵌めして取り付けられる。 As shown in FIG. 2, when the large diameter portion 7 a through which the cap nut 8 as the movable joint member cannot be passed is formed in the union rod 7 as the fixed joint member, the union rod 7 is attached to the cap nut 8. A c-ring 9 is attached to the inner circumferential groove of the cap nut 8 to be engaged with the step 7b of the union rod 7 in order to prevent the cap nut 8 from coming off. In this case, the union rod 7 is attached by press fitting after the c-ring 9 is mounted in the inner circumferential groove of the cap nut 8.

固定継手部材と可動継手部材を備えた継手の別の例に回転管継手がある。
この種の回転管継手は、嵌合部を備えた固定継手部材と、嵌合部に回転かつ抜差し可能に差込まれる差込み部を備えた可動継手部材よりなり、嵌合部と差込み部のうち、いずれか一方の接合面に環状溝を、他方の接合面に環状溝に向けて開口する径方向の孔を形成し、該孔を通してボールを環状溝に嵌合したのち、前記孔にネジを捩込み、止着した構造となっている（特許文献２）。 Another example of a joint provided with a fixed joint member and a movable joint member is a rotary pipe joint.
This type of rotary joint includes a fixed joint member having a fitting portion and a movable joint member having an insertion portion that is inserted into the fitting portion so as to be rotatable and detachable. Of the fitting portion and the insertion portion, An annular groove is formed on one of the joint surfaces, and a radial hole is formed on the other joint surface toward the annular groove. A ball is fitted into the annular groove through the hole, and a screw is inserted into the hole. The structure is screwed and fastened (Patent Document 2).

特開２０００−２２０７８０号JP 2000-220780 A 特開平８−２００５７５号JP-A-8-200575

図２に示す抜け止め用のｃリング９は、ボールに比べ、抜け止め機能が強いが、装着はボール程容易ではない。ｃリング９を袋ナット８に装着する場合、従来は治具を用い、ｃリング９を縮径させた状態で袋ナット８の内周溝に押し込んで装着している。 The c-ring 9 for retaining shown in FIG. 2 has a stronger retaining function than the ball, but is not as easy to mount as the ball. When the c-ring 9 is attached to the cap nut 8, conventionally, a jig is used and the c-ring 9 is attached by being pushed into the inner peripheral groove of the cap nut 8 with the diameter reduced.

本発明は、抜け止め用のｃリングの装着を容易に行うことができる構造の継手を提供することを目的とする。 An object of this invention is to provide the coupling of the structure which can mount | wear with the c ring for retaining easily.

請求項１に係わる発明は、配管設備の管同士や管と流体機器の接続口など管状部を接続する際に用いる継手であって、固定継手部材と該固定継手部材に抜け止めされて回転可能に取付けられる可動継手部材よりなり、可動継手部材の固定継手部材からの抜け止めは、可動継手部材と固定継手部材のいずれか一方の継手部材の一側の開口部より押込んで開口部奥側の内周溝に嵌着されるｃリングと、他方の継手部材に形成され、一部が前記内周溝から突出するｃリングに係止する段又は溝のエッジによって行われる継手において、前記一方の継手部材の開口部は開口端に向かって径が漸次拡大するように形成されることを特徴とし、
請求項２に係わる発明は、請求項１に係わる発明の継手がユニオン継手であり、一方の継手部材が袋ナットで、他方の継手部材には袋ナットに嵌挿することができない径大部を有することを特徴とする。 The invention according to claim 1 is a joint used when connecting tubular parts such as pipes of piping equipment and pipes and connection ports of fluid equipment, and is fixed to the fixed joint member and fixed to the fixed joint member and is rotatable. The movable joint member is attached to the fixed joint member, and the movable joint member is prevented from coming off from the fixed joint member by pushing in from the opening on one side of either the movable joint member or the fixed joint member. In the c-ring fitted in the inner circumferential groove and the coupling formed by the step or the edge of the groove formed on the other coupling member and partially locked to the c-ring protruding from the inner circumferential groove, The opening of the joint member is formed such that the diameter gradually increases toward the opening end,
In the invention according to claim 2, the joint of the invention according to claim 1 is a union joint, one joint member is a cap nut, and the other joint member has a large diameter portion that cannot be inserted into the cap nut. It is characterized by having.

本発明において、可動継手部材と固定継手部材のいずれか一方の継手部材へのｃリングの装着は、開口部の開口端にｃリングを装着するか、或いは他方の継手部材の一側にｃリングを装着したのち、両継手部材のいずれか一方を他方に押込むことにより行われ、該押し込みに伴ってｃリングは一方の継手部材の開口部に案内されて縮径しながら奥に進み、内周溝に達する。内周溝に達すると、溝内に拡開して嵌着され固定される。ｃリングが内周溝に嵌着されたのち、一方の継手部材は、他方の継手部材に形成される直径の異なる段又は内周溝のエッジに係止することにより抜け止めされる。 In the present invention, the c-ring is attached to one of the movable joint member and the fixed joint member by attaching the c-ring to the opening end of the opening, or to the one side of the other joint member. Is attached by pushing either one of the joint members into the other. Reach the circumferential groove. When it reaches the inner circumferential groove, it expands into the groove and is fixed. After the c-ring is fitted in the inner circumferential groove, one joint member is prevented from coming off by being engaged with a step having a different diameter formed on the other joint member or an edge of the inner circumferential groove.

本発明によると、可動継手部材と固定継手部材の押し嵌め時にｃリングが可動継手部材と固定継手部材のいずれか一方の継手部材に嵌着され、ｃリングの縮径は工具により行うことなく、開口部への他方の継手部材の押込みに伴って行われるため、ｃリングの装着が容易に行える。 According to the present invention, the c-ring is fitted to one of the movable joint member and the fixed joint member when the movable joint member and the fixed joint member are press-fitted, and the diameter of the c-ring is not reduced by a tool. Since it is performed with the other joint member being pushed into the opening, the c-ring can be easily mounted.

本発明の継手には、一方の継手部材に装着されるｃリングと、他方の継手部材に形成され、ｃリングに係止する段又は溝のエッジとによって両継手部材の抜け止めが行われるが、前記他方の継手部材には、一方の継手部材に挿入することができない径大部を有していてもよいし、他方の継手部材がインサート成形されたものであってもよい。 In the joint of the present invention, both joint members are prevented from coming off by a c-ring attached to one joint member and a step or groove edge formed on the other joint member and engaged with the c-ring. The other joint member may have a large-diameter portion that cannot be inserted into one joint member, or the other joint member may be formed by insert molding.

他方の継手部材が径大部を有していてもいなくても、またインサート成形されているか否かに関わらず上述する方法により他方の継手部材に一方の継手部材を装着することが可能である。
なお、他方の継手部材をインサート成形する場合には、他方の継手部材に一方の継手部材を装着した状態でインサート成形することができるし、他方の継手部材をインサート成形したのち一方の継手部材に装着することもできる。 It is possible to attach one joint member to the other joint member by the method described above regardless of whether or not the other joint member has a large diameter portion and whether or not it is insert-molded. .
In addition, when the other joint member is insert-molded, it can be insert-molded with one joint member mounted on the other joint member, and after the other joint member is insert-molded, It can also be installed.

また、他方の継手部材がインサート成形される場合、インサート部分に径大部を設ければ、樹脂との接触面積が増大し、接着強度を上げることもできる。 Further, when the other joint member is insert-molded, if the insert portion is provided with a large-diameter portion, the contact area with the resin can be increased, and the adhesive strength can be increased.

従来のユニオン継手の断面図。Sectional drawing of the conventional union joint. ユニオン鍔と袋ナットを組付けた従来例の断面図。Sectional drawing of the prior art example which assembled | attached the union cage | basket and the cap nut. 本発明に係わるユニオン鍔と袋ナットの組付け前の分解図。The exploded view before the assembly | attachment of the union cage | basket concerning this invention and a cap nut. 図３に示す袋ナットにｃリングを装着した状態を示す断面図。Sectional drawing which shows the state which mounted | wore the cap nut shown in FIG. 3 with the c ring. ユニオン鍔を袋ナットに嵌挿した状態を示す断面図。Sectional drawing which shows the state which inserted the union cage | basket in the cap nut. ｃリングが内周溝に嵌合した状態を示す断面図。Sectional drawing which shows the state which c-ring fitted to the inner periphery groove | channel. ユニオン鍔と袋ナットを最大限離したときの状態を示す断面図。Sectional drawing which shows a state when a union cage | basket and a cap nut are separated to the maximum. 固定継手部材にエルボ継手を組み付けるときの断面図。Sectional drawing when assembling an elbow joint to a fixed joint member. 固定継手部材をエルボ継手に押込んだときの断面図。Sectional drawing when a fixed joint member is pushed into an elbow joint. 固定継手部材をエルボ継手に組み付けたときの断面図Sectional view when the fixed joint member is assembled to the elbow joint

以下、本発明の実施形態について図面により説明する。
図３は、固定継手部材と可動継手部材の両継手部材のうち、一方の継手部材であるユニオン鍔１１と、該ユニオン鍔１１に組付けられる他方の継手部材である袋ナット１２と、袋ナット１２の抜け止め用のｃリング１３を示すもので、ユニオン鍔１１は袋ナット１２に挿入することができない径大部１４と、ｃリング１３が係止可能な段１５及び１６を前後に備えている。 Embodiments of the present invention will be described below with reference to the drawings.
FIG. 3 shows a union rod 11 which is one of the joint members of the fixed joint member and the movable joint member, a cap nut 12 which is the other joint member assembled to the union rod 11, and a cap nut. 12 shows a c-ring 13 for retaining the union, and the union rod 11 is provided with a large-diameter portion 14 that cannot be inserted into the cap nut 12 and steps 15 and 16 that can be engaged with the c-ring 13 at the front and rear. Yes.

袋ナット１２は、ユニオン鍔１１が嵌挿される側の開口部１８が開口に向かって漸次拡大する径をなしてテーパ状をなし、開口部１８の奥側に内周溝１９が形成されている。
ｃリング１３は、ｏリングの一部を切欠いた形状をなし、外径が好ましくは開口部１８の最大径の開口と同一か、又は若干小さ目に形成されるが、若干大き目に形成してあってもよい。 The cap nut 12 has a tapered shape in which the opening 18 on the side where the union bar 11 is inserted is gradually enlarged toward the opening, and an inner circumferential groove 19 is formed on the inner side of the opening 18. .
The c-ring 13 has a shape in which a part of the o-ring is cut out, and the outer diameter is preferably the same as or slightly smaller than the maximum diameter opening of the opening 18, but is slightly larger. May be.

ユニオン鍔１１と袋ナット１２を組み付けるときには、先ず袋ナット１２の開口部１８の開口にｃリング１３を装着する。ｃリング１３の外径が開口部１８の最大径の開口より若干大きいときには、ｃリング１３を窄めて開口部１７の開口に装着する（図４）。 When assembling the union rod 11 and the cap nut 12, first, the c-ring 13 is attached to the opening of the opening 18 of the cap nut 12. When the outer diameter of the c-ring 13 is slightly larger than the opening of the maximum diameter of the opening 18, the c-ring 13 is narrowed and attached to the opening of the opening 17 (FIG. 4).

次にユニオン鍔１１と袋ナット１２のいずれか一方を他方に押し込む。押し込みによりユニオン鍔１１端面のエッジがｃリング１３に当たると、ｃリング１３は一旦拡がってユニオン鍔１１を受け入れる。この状態で押し込みを続けると、ユニオン鍔１１はｃリング１３を通って押し込まれ、やがて段１５及び１６内にｃリング１３が納まる。段１５を通過したｃリング１３は開口部１８の開口に留まった状態で縮径し復元する。ｃリング１３が段１５及び１６内に納まった状態で挿入を続けると、段１６のエッジがリング１３に当たる（図５）。この状態でユニオン鍔１１と袋ナット１２のいずれか一方を他方に向かって強く押込むと、段１６のエッジに係止するｃリングが開口部１８に案内され、径の狭まる開口部奥側に向かって縮径しながら押込まれる。そして内周溝１９に達し、内周溝１９に嵌合して拡開し、固定状態となる（図６）。 Next, either the union barn 11 or the cap nut 12 is pushed into the other. When the edge of the end surface of the union rod 11 hits the c-ring 13 by pushing, the c-ring 13 is once expanded to accept the union rod 11. If pushing is continued in this state, the union rod 11 is pushed through the c-ring 13, and the c-ring 13 is accommodated in the steps 15 and 16 before long. The c-ring 13 that has passed through the step 15 is reduced in diameter and restored while remaining in the opening of the opening 18. If the insertion is continued with the c-ring 13 in the steps 15 and 16, the edge of the step 16 hits the ring 13 (FIG. 5). In this state, when one of the union rod 11 and the cap nut 12 is strongly pushed toward the other, the c-ring that is locked to the edge of the step 16 is guided to the opening 18, and the diameter of the opening narrows toward the back of the opening. It is pushed in while reducing the diameter. Then, it reaches the inner circumferential groove 19 and fits and expands in the inner circumferential groove 19 to be in a fixed state (FIG. 6).

以上のようにしてｃリング１３は、ユニオン鍔１１の押込みによって内周溝１９に装着され、ｃリング１３の装着に伴ってユニオン鍔１１と袋ナット１２の組付けも行われる。
ユニオン鍔１１と袋ナット１２の組付後、図７の状態で図１に示すニップル１、配管の管端部或いは流体機器の接続口との接続、又はユニオン鍔１１と他の管端部や継手との接続或いはユニオン鍔１１のインサート成形等が前後して行われる。 As described above, the c-ring 13 is mounted in the inner circumferential groove 19 by pushing the union bar 11, and the union bar 11 and the cap nut 12 are also assembled with the mounting of the c-ring 13.
After assembling the union rod 11 and the cap nut 12, in the state of FIG. 7, the nipple 1 shown in FIG. 1, connection to the pipe end or the connection port of the fluid device, or the union rod 11 and other pipe end Connection to the joint or insert molding of the union rod 11 is performed before and after.

上記実施形態のユニオン鍔１１は、袋ナット１２に挿入することができない径大部１４を有しているが、別の実施形態では径大部がなく、袋ナット１２に挿入可能な、例えば図１に示すユニオン鍔３のように形成される。ユニオン鍔１１をインサート成形後に袋ナット１２に組み付ける際には、上記と同様にして組付けを行うことができる。 The union rod 11 of the above embodiment has a large-diameter portion 14 that cannot be inserted into the cap nut 12, but in another embodiment, there is no large-diameter portion and can be inserted into the cap nut 12. It is formed like a union cage 3 shown in FIG. When the union rod 11 is assembled to the cap nut 12 after insert molding, the assembly can be performed in the same manner as described above.

図８は、管状部に連結される固定継手部材２１と、該固定継手部材２１に連結される可動継手部材としてのエルボ継手２２と、両者の抜け止めを行うｃリング２３を示すもので、固定継手部材２１には一側の外周面に３条の外周溝２４、２５、２６が形成されると共に、他側に管状部が捩じ込んで連結されるようになっており、外周溝２４、２５にはそれぞれシール用のｏリング２７が装着されると共に、外周溝２６は蟻溝状をなし、周溝のエッジがｃリング２３に係止するようになっている。 FIG. 8 shows a fixed joint member 21 connected to the tubular portion, an elbow joint 22 as a movable joint member connected to the fixed joint member 21, and a c-ring 23 for preventing both of them from being fixed. The joint member 21 has three outer peripheral grooves 24, 25, 26 formed on one outer peripheral surface, and a tubular portion is screwed to the other side to be connected. An o-ring 27 for sealing is attached to each 25, and the outer circumferential groove 26 has a dovetail shape, and the edge of the circumferential groove is locked to the c-ring 23.

エルボ継手２２は、固定継手部材２１に嵌挿される側の開口部に開口に向かって漸次拡大する径をなすテーパ部２９を有し、該テーパ部２９の奥側に内周溝３１が形成されている。
ｃリング２３は、内周溝３１と同径をなしているが、若干大きめに形成されていてもよい。 The elbow joint 22 has a tapered portion 29 having a diameter that gradually increases toward the opening at an opening portion on the side to be inserted into the fixed joint member 21, and an inner circumferential groove 31 is formed on the back side of the tapered portion 29. ing.
The c-ring 23 has the same diameter as the inner circumferential groove 31, but may be formed slightly larger.

固定継手部材２１とエルボ継手２２を組み付けるときには、先ずｃリング２３を若干押し拡げて固定継手部材２１の一端から挿入し、外周溝２６に装着させる。ｃリング２３は外力を加えない状態で内周溝３１と同径をなしていることから、外周溝２６に装着したときには、図示するように外周溝２６の溝底から浮いた状態となっている。 When assembling the fixed joint member 21 and the elbow joint 22, first, the c-ring 23 is slightly expanded and inserted from one end of the fixed joint member 21 and attached to the outer circumferential groove 26. Since the c-ring 23 has the same diameter as the inner circumferential groove 31 without applying an external force, the c-ring 23 floats from the groove bottom of the outer circumferential groove 26 as shown in FIG. .

次に固定継手部材２１をエルボ継手２２に押し込む（図８）。押込みにより外周溝２４、２５に装着されるｏリング２７が開口部に挿入され、ｃリング２３がテーパ部２９に当たる（図９）。この状態で固定継手部材２１をエルボ継手２２に強く押込むと、ｃリング２３は該リング２３に係止する外周溝２６のエッジにより押込まれ、テーパ部２９に案内されて縮径しながら押し進み、内周溝３１に達する。そして拡開し、該内周溝３１に嵌合して固定状態となる（図１０）。
以上のようにしてｃリングは、固定継手部材２１の押込みによって内周溝３１に嵌着され、これによりエルボ継手２２は固定継手２１により抜け止めされた状態で連結される。 Next, the fixed joint member 21 is pushed into the elbow joint 22 (FIG. 8). The o-ring 27 attached to the outer circumferential grooves 24 and 25 is inserted into the opening by pushing, and the c-ring 23 hits the tapered portion 29 (FIG. 9). When the fixed joint member 21 is strongly pushed into the elbow joint 22 in this state, the c-ring 23 is pushed by the edge of the outer peripheral groove 26 that is locked to the ring 23, and is pushed forward while being reduced in diameter by being guided by the tapered portion 29. The inner circumferential groove 31 is reached. And it expands and it fits in this inner peripheral groove 31, and will be in a fixed state (FIG. 10).
As described above, the c-ring is fitted into the inner circumferential groove 31 by pressing the fixed joint member 21, whereby the elbow joint 22 is connected in a state of being prevented from being detached by the fixed joint 21.

前記実施形態では、エルボ継手２２を可動継手部材としたが、エルボ継手を固定継手部材とし、固定継手部材２１を可動継手部材としてもよい。
前記実施形態はまた、固定継手部材２１と、該継手部材２１に連結されるエルボ継手２２について示したが、エルボ継手２２は他の継手、例えばソケット継手であってもよいし、チーズ継手やキャップ継手であってもよい。 In the embodiment, the elbow joint 22 is a movable joint member, but the elbow joint may be a fixed joint member and the fixed joint member 21 may be a movable joint member.
In the above embodiment, the fixed joint member 21 and the elbow joint 22 connected to the joint member 21 have been described. However, the elbow joint 22 may be another joint, for example, a socket joint, a cheese joint, or a cap. A joint may be used.

１１・・ユニオン鍔
１２・・袋ナット
１３、２３・・ｃリング
１４・・径大部
１５、１６・・段
１８・・開口部
１９、３１・・内周溝
２１・・固定継手部材
２２・・エルボ継手
２４、２５、２６・・外周溝
２７・・ｏリング
２９・・テーパ部 11 ···················································································································・ Elbow joints 24, 25, 26 ・・ Outer peripheral groove 27 ・・ O-ring 29 ・・ Taper

Claims

配管設備の管同士や管と流体機器の接続口など管状部を接続する際に用いる継手であって、固定継手部材と該固定継手部材に抜け止めされて回転可能に取付けられる可動継手部材よりなり、可動継手部材の固定継手部材からの抜け止めは、可動継手部材と固定継手部材のいずれか一方の継手部材の一側の開口部より押込んで開口部奥側の内周溝に嵌着されるｃリングと、他方の継手部材に形成され、一部が前記内周溝から突出するｃリングに係止する段又は溝のエッジによって行われる継手において、前記一方の継手部材の開口部は開口端に向かって径が漸次拡大するように形成されることを特徴とするユニオン継手。 It is a joint used when connecting tubular parts such as pipes of piping equipment and pipes and connection ports of fluid equipment, and consists of a fixed joint member and a movable joint member that is secured to the fixed joint member and rotatably mounted. In order to prevent the movable joint member from coming off the fixed joint member, the movable joint member is pushed into one of the opening portions of the joint member of either the movable joint member or the fixed joint member, and is fitted into the inner peripheral groove on the back side of the opening portion. In a joint formed by a c-ring and a step or groove edge that is formed on the other joint member and partially engages with the c-ring protruding from the inner circumferential groove, the opening of the one joint member is an open end A union joint characterized by being formed so that the diameter gradually increases toward.

前記継手がユニオン継手であり、一方の継手部材が袋ナットで、他方の継手部材には袋ナットに嵌挿することができない径大部を有することを特徴とする請求項１記載のユニオン継手。 The union joint according to claim 1, wherein the joint is a union joint, one joint member is a cap nut, and the other joint member has a large-diameter portion that cannot be fitted into the cap nut.