JP6542741B2 - Plug-in type coupling joint - Google Patents

Plug-in type coupling joint Download PDF

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Publication number
JP6542741B2
JP6542741B2 JP2016214416A JP2016214416A JP6542741B2 JP 6542741 B2 JP6542741 B2 JP 6542741B2 JP 2016214416 A JP2016214416 A JP 2016214416A JP 2016214416 A JP2016214416 A JP 2016214416A JP 6542741 B2 JP6542741 B2 JP 6542741B2
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curvature
edge
inner peripheral
plug
inclined surface
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JP2018071725A (en
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正司 笠原
正司 笠原
宏文 笠原
宏文 笠原
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Apic Yamada Corp
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Yamada Manufacturing Co Ltd
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Priority to JP2016214416A priority Critical patent/JP6542741B2/en
Priority to TW106134975A priority patent/TWI651112B/en
Priority to KR1020170139416A priority patent/KR102017947B1/en
Priority to CN201711054324.3A priority patent/CN108019575B/en
Publication of JP2018071725A publication Critical patent/JP2018071725A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L37/00—Couplings of the quick-acting type
    • F16L37/08—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members
    • F16L37/084—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking
    • F16L37/086—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of latching members pushed radially by spring-like elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L33/00—Arrangements for connecting hoses to rigid members; Rigid hose connectors, i.e. single members engaging both hoses
    • F16L33/02—Hose-clips
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C33/00—Hose accessories
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L21/00—Joints with sleeve or socket
    • F16L21/02—Joints with sleeve or socket with elastic sealing rings between pipe and sleeve or between pipe and socket, e.g. with rolling or other prefabricated profiled rings

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)
  • Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)

Description

本発明は差込式結合継手に係り、特に、消防用結合金具として用いる場合に好適な差込式結合継手の結合構造に関する。   The present invention relates to a plug-in joint, and more particularly to a joint structure of a plug-in joint suitable for use as a fire fitting.

一般に、消防ホース同士、消防ホースと管槍、消火栓と消防ホースの連結には、消防用結合金具が用いられる。この結合金具の一種である差込式結合継手は、図９に示すように、差し具１０と受け具２０が着脱可能に構成されたものである。ここで、差し具１０の先端部に設けられた外周段差１２に受け具２０に設けられた係合爪２４が嵌合することにより結合される。差し具１０には、受け具２０の係合爪２４を差し具１０の外周段差１２から外すための解除部材（押し輪）１４が装着されている。この解除部材１４を受け具２０に向けて押し込むことにより、係合爪２４を外周側へ退避させ、外周段差１２から外すことができる。これにより、差し具１０と受け具２０の結合状態が解除され、その結果、差し具１０と受け具２０を取り外すことができる（例えば、以下の特許文献１を参照）。   In general, fire fitting fittings are used to connect fire hoses, fire hoses and pipes, and fire hydrants and fire hoses. As shown in FIG. 9, a plug-in type coupling fitting, which is a type of the fitting, is a plug fitting 10 and a receiving fitting 20 configured to be detachable. Here, the engaging claws 24 provided on the receiving tool 20 are engaged by being fitted to the outer peripheral step 12 provided on the tip end portion of the inserting tool 10. A releasing member (pushing ring) 14 for removing the engaging claws 24 of the receiver 20 from the outer peripheral step 12 of the inserting tool 10 is attached to the inserting tool 10. By pushing the release member 14 toward the receiving tool 20, the engagement claw 24 can be retracted to the outer peripheral side and removed from the outer peripheral step 12. Thereby, the coupling state of the plug 10 and the receiver 20 is released, and as a result, the plug 10 and the receiver 20 can be removed (see, for example, Patent Document 1 below).

ところで、上記の差込式結合継手においては、上記受け具２０の受け口２０ａ内において、複数の円弧形状の係合爪２４がそれぞれ図示しないばね部材により付勢されることにより突出している。そして、差し具１０の差し口１０ａを受け具２０の受け口２０ａに挿入すると、差し具１０の先端縁部１１が上記複数の係合爪２４の傾斜面部２４ａ１に当接し、係合爪２４を外周側へ押し出しながら進入する。やがて係合爪２４が差し具１０の外周段差１２に対面すると、上記ばね部材により係合爪２４が再び突出し、外周段差１２に係合する。   By the way, in the above-mentioned plug-in type coupling joint, in the receptacle 20a of the above-mentioned receptacle 20, a plurality of arc-shaped engaging claws 24 are projected by being biased by a spring member (not shown). Then, when the insertion port 10a of the insertion tool 10 is inserted into the receiving port 20a of the reception tool 20, the tip end edge 11 of the insertion tool 10 abuts on the inclined surface 24a1 of the plurality of engaging claws 24 Enter while pushing to the side. When the engaging claw 24 eventually faces the outer peripheral step 12 of the plug 10, the engaging claw 24 is again protruded by the spring member and engaged with the outer peripheral step 12.

特開２００１−１１６１５０号公報JP 2001-116150 A

しかしながら、上記従来の差込式結合継手においては、継手の結合作業を行う際に、差し具１０を受け具２０に対して斜めに挿入すると、途中で突き当たった状態となり差し込みができなくなることがある。また、このときに、差し具１０と受け具２０が噛み込んで抜き差し不能になってしまう場合もあった。さらに、差し具１０を受け具２０に挿入することはできるものの、挿入途中で引っかかりがあり、挿入方向を変えたり力を入れ直すことによってやっと結合させることができるなど、装着感が悪く、結合作業をスムーズかつ快適に行うことができない場合もあった。   However, in the above-mentioned conventional plug-in type coupling joint, when the inserting tool 10 is inserted obliquely with respect to the receiving tool 20 when the jointing operation of the joint is carried out, it may be hit halfway and may not be able to be inserted. . In addition, at this time, the plug 10 and the receiver 20 may bite and become impossible to remove and insert. Furthermore, although the insertion tool 10 can be inserted into the receiving tool 20, there is a catch during the insertion, and the attachment feeling is bad, for example, it can be finally coupled by changing the insertion direction or re-entering the force. In some cases it was not possible to do so smoothly and comfortably.

そこで、本発明は上記問題点を解決するものであり、その課題は、差込式結合継手の結合作業時の挿入不良の発生を抑制することのできる結合構造を提供することにある。   Then, this invention solves the said problem, The subject is providing the connection structure which can suppress generation | occurrence | production of the insertion defect at the time of the joining operation of a plug-in type coupling joint.

斯かる実情に鑑み、本発明の差込式結合継手は、先端側に傾斜面部を備えた円弧形状の内周面を有する係合爪が受け口の内部において出没可能かつ内周側へ突出するように付勢された状態に設けられた受け具と、差し口の外周において円筒面状の外周面を備えた先端縁部及び前記先端縁部の基端側に前記係合爪と係合可能な外周段差が設けられた差し具と、を具備し、前記差し口が前記受け口に差し込まれたときに前記係合爪と前記外周段差との係合により結合可能に構成される結合継手であって、前記傾斜面部は、結合作業の初期において前記先端縁部の外周側の角部が最初に接触する位置を含む領域であって、前記受け口の軸線と直交する仮想平面上において、前記外周段差の小径側部分の曲率よりも小さく、前記小径側部分よりも前記外周段差の大径側部分の曲率に近い曲率を備える前記領域を有することを特徴とする。なお、この場合には、前記領域の前記仮想平面上の曲率は、前記小径側部分の曲率と前記大径側部分の曲率との間の値を持つときに限らず、前記大径側部分の曲率以下であるときも含まれる。   In view of such circumstances, in the plug-in type coupling joint of the present invention, the engaging claw having the arc-shaped inner peripheral surface provided with the inclined surface portion on the front end side can project and retract inside the receptacle and project to the inner peripheral side. And a tip end portion provided with a cylindrical outer peripheral surface on the outer periphery of the insertion port, and the proximal end side of the tip end portion can be engaged with the engagement claw. A joint provided with a plug provided with an outer peripheral step, wherein the coupling claw is configured to be connectable by the engagement of the engaging claw and the outer peripheral step when the insertion port is inserted into the receptacle. The inclined surface portion is a region including a position at which a corner on the outer peripheral side of the tip end edge first contacts in the initial stage of the bonding operation, and on a virtual plane orthogonal to the axis of the receptacle, the inclined surface portion The curvature of the smaller diameter portion is smaller than that of the smaller diameter portion And having the region with a near curvature to the curvature of the larger-diameter portion of the circumferential step. In this case, the curvature of the region on the virtual plane is not limited to a value between the curvature of the small diameter portion and the curvature of the large diameter portion, and the curvature of the large diameter portion is not limited. Also included when the curvature or less.

本発明において、前記領域の前記仮想平面上の曲率は、前記大径側部分の曲率以下であることが望ましい。特に、前記領域の前記仮想平面上の曲率は、前記大径側部分の曲率と一致する曲率を備えることが望ましい。   In the present invention, it is desirable that the curvature of the region on the imaginary plane is equal to or less than the curvature of the large diameter side portion. In particular, it is desirable that the curvature on the virtual plane of the region has a curvature that matches the curvature of the large diameter side portion.

本発明において、前記内周面には、前記傾斜面部の内縁に隣接する内周縁部が設けられ、前記領域は、前記傾斜面部の外縁から、或いは、前記受け具の非結合時において前記係合爪が突出状態にあるときに前記先端縁部の外周側の角部に対応する半径方向の位置にある前記傾斜面部の表面部位と前記外縁との間にある外側境界から、前記表面部位と前記内縁との間にある内側境界までの範囲を有し、前記傾斜面部は、前記内側境界から前記内縁までの範囲では、前記内周縁部のうちの前記傾斜面部と異なる曲率を備える少なくとも主体部分に向けて、前記仮想平面上の曲率が前記領域の曲率から前記内周縁部の曲率まで漸次変化することが好ましい。   In the present invention, the inner peripheral surface is provided with an inner peripheral edge adjacent to the inner edge of the inclined surface, and the region is the outer edge of the inclined surface or the engagement when the holder is not coupled. From the outer boundary between the surface portion of the inclined surface portion and the outer edge located at the radial position corresponding to the outer peripheral corner of the tip end edge when the claw is in the protruding state, the surface portion and the outer surface In the range from the inner boundary to the inner edge, the inclined surface portion has at least a main portion having a curvature different from that of the inclined surface portion in the range from the inner boundary to the inner edge. Preferably, the curvature on the imaginary plane gradually changes from the curvature of the region to the curvature of the inner peripheral portion.

本発明において、前記係合爪の前記内周面のうちの内周縁部は、左右の両端部を除く少なくとも主体部分において、前記大径側部分の曲率よりも大きく、かつ、前記小径側部分の曲率以下の曲率を備えることが好ましい。この場合においては、前記領域の前記仮想平面上の曲率は、上述の条件の代わりに、前記内周縁部の少なくとも前記主体部分の前記曲率より小さい値としてもよい。この場合において、前記領域の前記仮想平面上の曲率は、前記内周縁部の少なくとも前記主体部分の前記曲率よりも前記大径側部分の曲率に近いことが望ましい。なお、この場合には、前記領域の前記仮想平面上の曲率は、前記小径側部分の曲率と前記大径側部分の曲率との間の値を持つときに限らず、前記大径側部分の曲率以下の値を持つときも含まれる。なお、前記内周縁部の少なくとも前記主体部分の前記曲率は、前記大径側部分よりも前記小径側部分の曲率に近い値を有することが望ましい。   In the present invention, the inner peripheral edge portion of the inner peripheral surface of the engaging claw is larger in curvature of the larger diameter side portion at least in the main portion excluding both left and right end portions, and of the smaller diameter side portion Preferably, the curvature is equal to or less than the curvature. In this case, the curvature of the region on the virtual plane may be a value smaller than the curvature of at least the main portion of the inner peripheral edge, instead of the above-described condition. In this case, it is preferable that the curvature of the region on the virtual plane be closer to the curvature of the large diameter side portion than the curvature of at least the main portion of the inner peripheral edge portion. In this case, the curvature of the region on the virtual plane is not limited to a value between the curvature of the small diameter portion and the curvature of the large diameter portion, and the curvature of the large diameter portion is not limited. Also included when it has a value less than the curvature. Preferably, the curvature of at least the main portion of the inner peripheral edge portion has a value closer to the curvature of the small diameter side portion than the large diameter side portion.

本発明において、前記内周面（傾斜面部及び内周縁部）における円周方向の両側の稜線部は、半径０．３ｍｍ以上の丸め形状、若しくは、幅１．０ｍｍ以上の面取り形状を有することが好ましい。この場合において、前記稜線部は、半径０．５ｍｍ以上の丸め形状、若しくは、幅１．０ｍｍ以上の面取り形状を有することが望ましい。また、内周縁部には、前記主体部分の曲率よりも外周段差の大径側部分の曲率に近い曲率を備える左右の両端部が設けられることが好ましい。この両端部の曲率は、前記大径側部分の曲率と一致することが望ましい。   In the present invention, the ridges on both sides in the circumferential direction of the inner peripheral surface (the inclined surface and the inner peripheral edge) have a rounded shape with a radius of 0.3 mm or more or a chamfered shape with a width of 1.0 mm or more preferable. In this case, it is desirable that the ridge portion have a rounded shape with a radius of 0.5 mm or more or a chamfered shape with a width of 1.0 mm or more. Preferably, the inner peripheral edge portion is provided with left and right end portions having a curvature closer to the curvature of the large diameter side portion of the outer peripheral step than the curvature of the main portion. It is desirable that the curvatures of the both end portions coincide with the curvatures of the large diameter side portion.

本発明において、前記係合爪は、型成形された焼結材、鍛造材、又は、鋳造材により構成されていることが好ましい。ここで、前記係合爪は焼結金属により構成されることが望ましい。また、前記係合爪は、前記内周面を構成する内周壁、前記外周段差と係合する係合面を構成する係合壁、並びに、前記内周面及び前記係合面と交差する円周方向両側の側面をそれぞれ構成する側面壁を一体に備えた箱型構造を備えることが望ましい。この場合において、前記内周壁の裏側には、前記箱型構造の内部において、前記内周壁及び前記係合壁と一体に接合された補強リブ構造が設けられることがさらに効果的である。この補強リブ構造の一部は、前記係合爪を内周側へ付勢するためのばね部材に接続されることが望ましい。   In the present invention, it is preferable that the engaging claw is made of a molded sintered material, a forged material, or a cast material. Here, it is desirable that the engagement claw be made of sintered metal. Further, the engaging claw is formed by an inner peripheral wall forming the inner peripheral surface, an engaging wall forming an engaging surface to be engaged with the outer peripheral step, and a circle intersecting the inner peripheral surface and the engaging surface It is desirable to provide a box type structure integrally provided with the side wall which each constitutes the side of a peripheral direction both sides. In this case, it is more effective that a reinforcing rib structure integrally joined with the inner peripheral wall and the engagement wall is provided on the back side of the inner peripheral wall inside the box-shaped structure. It is desirable that a part of the reinforcing rib structure is connected to a spring member for biasing the engaging claws to the inner peripheral side.

本発明によれば、係合爪の傾斜面部が外周段差の小径側部分の曲率よりも小さく、大径側部分に近い曲率を備える領域を有することにより、或いは、前記内周縁部の少なくとも主体部分の曲率より小さい領域を有することにより、結合作業の初期において係合爪に円周方向の力が加わり難くなるとともに、差し口の先端縁部と当接する傾斜面部によるガイド機能が高められることにより、差込式結合継手の結合作業時の挿入不良が抑制され、結合作業を円滑に行うことができるという優れた効果を奏し得る。また、差し口の先端縁部の外周側の角部と傾斜面部との整合性が向上して面接触状態に近づくことから、結合作業の初期において係合爪と先端縁部に加わる衝撃を軽減できるため、係合爪や差し口の損傷の低減や耐久性の向上を図ることができる。   According to the present invention, the inclined surface portion of the engagement claw has a region smaller than the curvature of the small diameter side portion of the outer peripheral step and having a curvature close to the large diameter side portion, or at least the main portion of the inner peripheral portion By having a region smaller than the curvature of the surface, it becomes difficult to apply a circumferential force to the engaging claw at the initial stage of the connecting operation, and the guiding function by the inclined surface portion in contact with the front end edge of the insertion port is enhanced. It is possible to suppress the insertion failure at the time of the joining operation of the plug-in joint, and to achieve an excellent effect that the joining operation can be smoothly performed. In addition, since the alignment between the outer peripheral corner of the front end edge of the insertion slot and the inclined surface improves and approaches a surface contact state, the impact applied to the engaging claw and the front end edge in the initial stage of the bonding operation is reduced. Therefore, it is possible to reduce the damage to the engaging claws and the fore-end and to improve the durability.

差込式結合継手の実施形態の係合爪の形状例をそれぞれ示すための、受け口の軸線の側から見た様子を示す内面図（ａ）、軸線方向に見た様子を示す正面図（ｂ）及び背面図（ｃ）、並びに、図１（ｂ）のＤ−Ｄ線に沿った断面を示す断面図（ｄ）及びＥ−Ｅ線に沿った断面を示す断面図（ｅ）である。An inner view (a) showing a state seen from the side of the axis of the socket for showing an example of the shape of the engaging claw of the embodiment of the plug-in type coupling joint, a front view showing a state seen in the axial direction 1 (c) and a rear view (c), and a cross-sectional view (d) showing a cross section taken along the line D-D in FIG. 1 (b) and a cross-sectional view (e) showing a cross section taken along the line E-E. 同実施形態の係合爪の図２（ｃ）のＡ−Ａ線に沿った断面を示す断面図（ａ）、外面図（ｂ）、及び、円周方向の側面を示す側面図（ｃ）である。Sectional drawing (a) which shows the cross section which followed the AA line of FIG.2 (c) of the engaging claw of the embodiment, an external view (b), and the side view which shows the side surface of the circumferential direction (c) It is. 同実施形態の結合作業の初期段階の状態を示す縦断面図である。It is a longitudinal cross-sectional view which shows the state of the initial stage of the joint operation of the embodiment. 同実施形態の結合作業の中間段階の状態を示す縦断面図である。It is a longitudinal cross-sectional view which shows the state of the middle stage of the joint operation of the embodiment. 同実施形態の結合作業の完了段階の状態を示す縦断面図図である。It is a longitudinal cross-sectional view which shows the state of the completion phase of the joint operation of the embodiment. 結合作業の初期段階において従来構造と実施形態における差し口と係合爪との関係をそれぞれ示す拡大図（ａ）及び（ｂ）である。It is an enlarged view (a) and (b) which each shows the relationship between the socket and engaging claw in the conventional structure and embodiment in the initial stage of a joint operation. 結合作業の中間段階において従来構造と実施形態における差し口と係合爪との関係をそれぞれ示す拡大図（ａ）及び（ｂ）である。It is an enlarged view (a) and (b) which each shows the relationship between the socket and engaging claw in the conventional structure and embodiment in the middle step of a joint operation. 結合作業の完了段階において従来構造と実施形態における差し口と係合爪との関係をそれぞれ示す拡大図（ａ）及び（ｂ）である。It is an enlarged view (a) and (b) which each shows the relationship between the socket and engaging claw in a conventional structure and embodiment in the completion phase of a joint operation. 従来構造の差込式結合継手の差し具と受け具の分解斜視図である。It is an exploded perspective view of a plug and a holder of a plug-in type connection joint of conventional structure. 従来構造の係合爪の内面図（ａ）、係合爪の正面図（ｂ）、及び、係合爪の側面図（ｃ）である。They are an internal view (a) of the engaging claw of conventional structure, a front view (b) of the engaging claw, and a side view (c) of the engaging claw.

次に、添付図面を参照して本発明の実施形態について詳細に説明する。最初に、図９を参照して、従来の差込式結合継手の基本構造を説明する。なお、以下に説明する従来構造や本実施形態の基本構造は、日本工業規格（ＪＩＳ）のＢ９９１１−１９６８「消防ホースの差込み式結合金具の寸法」に記載されている。   Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. First, the basic structure of a conventional plug-in coupling joint will be described with reference to FIG. In addition, the conventional structure demonstrated below and the basic structure of this embodiment are described in Japanese Industrial Standard (JIS) B9911-1968 "dimension of the plug-in type metal fitting of a fire hose".

図９に示すように、従来の差込式結合継手は、差し具１０と受け具２０を有し、これらの各金具は、消防用ホース、管槍、消火栓設備、消防用自動車などの各種の部材や機器に接続される。差し具１０は、全体として筒状に構成される。差し具１０は差し口１０ａを軸線方向の先端部に有する。この先端部は、差し口１０ａの開口縁側に大径の外周面部（大径側部分）を有する先端縁部１１を備える。また、この先端縁部１１の基端側に小径の外周面部（小径側部分）が形成されることにより、この大径側部分と小径側部分との間に外周段差１２が形成される。   As shown in FIG. 9, a conventional plug-in joint has a plug 10 and a receptacle 20, and each of these metal fittings includes various types of hoses such as fire hoses, pipes, fire hydrant equipment, fire fighting cars, etc. It is connected to parts and devices. The insertion tool 10 is cylindrically configured as a whole. The insertion tool 10 has an insertion port 10a at the tip end in the axial direction. The distal end portion is provided with a distal end edge portion 11 having a large diameter outer peripheral surface portion (large diameter side portion) on the opening edge side of the insertion port 10a. Further, by forming the small diameter outer peripheral surface portion (small diameter side portion) on the base end side of the distal end edge portion 11, the outer peripheral step 12 is formed between the large diameter side portion and the small diameter side portion.

また、軸線方向の基端部には、各種器具に対応する接続部１３が設けられている。この接続部１３は、図示例の場合には消防用ホースの取付箇所となっている。また、軸線方向の中間部の外周面上には、環状の解除部材（押し輪）１４が軸線方向に移動可能に嵌装されている。この解除部材１４は、差し具１０の中間部の外周面上に摺動自在に装着された筒状の筒体部１４ａと、この筒体部１４ａの基端側から半径方向外側に向けて突出するリング状のフランジ部１４ｂとを有する。   Moreover, the connection part 13 corresponding to various instruments is provided in the proximal end part of an axial direction. The connection portion 13 is an attachment point of the fire hose in the illustrated example. Further, an annular release member (push ring) 14 is fitted on the outer peripheral surface of the axially intermediate portion so as to be movable in the axial direction. The release member 14 projects radially outward from the proximal end side of the cylindrical portion 14a, which is slidably mounted on the outer peripheral surface of the middle portion of the insertion tool 10, and the cylindrical portion 14a. And an annular flange portion 14b.

一方、受け具２０も、上記と同様の各種の機器に接続される。受け具２０も全体として筒状に構成されるが、軸線方向の先端部に相当する受け口２０ａの先端縁部２１が軸線方向の基端部に比べて半径方向外側に拡大した形状を備えている。受け具２０は、基端側に各種器具や機器に対応する接続部２２ａを備え、先端側には拡径した取付枠部２２ｂを備えた筒状の受け具本体２２を備えている。この受け具本体２２の取付枠部２２ｂに対して螺合などにより締め輪２３が先端側から装着される。締め輪２３の内側に板ばね等のばね部材を介して内径側に付勢された状態で複数の係合爪２４が爪座２６の開口部から出没自在となるように取り付けられている。締め輪２３の外周に設けられた環状の取付座２３ａには可撓性と弾性を有する素材からなる筒状の保護部材（ゴムバンド、タイヤなどとも呼ばれる。）２７が装着されている。   On the other hand, the receptacle 20 is also connected to the same various devices as described above. The receptacle 20 is also generally configured in a cylindrical shape, but has a shape in which the distal end edge 21 of the receptacle 20a corresponding to the distal end in the axial direction is expanded radially outward compared to the proximal end in the axial direction. . The receptacle 20 includes a connecting part 22a corresponding to various instruments and devices on the proximal end side, and a tubular receptacle body 22 including a mounting frame part 22b having a large diameter on the distal end side. The clamp ring 23 is attached from the front end side by screwing or the like to the mounting frame portion 22 b of the receiving tool main body 22. A plurality of engagement claws 24 are attached to the inside of the clamp ring 23 so as to be able to extend and retract from the opening of the claw seat 26 in a state of being urged to the inner diameter side via a spring member such as a plate spring. A cylindrical protective member (also referred to as a rubber band, a tire or the like) 27 made of a flexible and elastic material is mounted on an annular mounting seat 23a provided on the outer periphery of the clamp ring 23.

上記受け具２０の受け口２０ａ内に差し具１０の差し口１０ａを挿入すると、先端縁部１１が係合爪２４に当接する。ここでさらに差し具１０を押し込むことにより、係合爪２４が外周側へ押し込まれた状態で先端縁部１１が軸線方向の奥側へ進み、外周段差１２が係合爪２４を越えて奥側へ移動すると、係合爪２４がばね部材の弾性力により復元し、外周段差１２と係合する。これにより、差し具１０と受け具２０が抜けないように結合された状態となる。   When the insertion port 10 a of the insertion tool 10 is inserted into the receiving port 20 a of the receiving tool 20, the leading edge 11 abuts on the engaging claw 24. Here, by further pushing the insertion tool 10, the distal end edge 11 advances to the back side in the axial direction in a state where the engaging claw 24 is pushed to the outer peripheral side, and the outer peripheral step 12 passes the engaging claw 24 and is on the rear side Then, the engagement claw 24 is restored by the elastic force of the spring member and engages with the outer circumferential step 12. As a result, the joining tool 10 and the receiving tool 20 are coupled so as not to come off.

一方、差し具１０と受け具２０が結合した状態で、フランジ部１４ｂに指を当てるなどの姿勢で解除部材（押し輪）１４を受け口２０ａの側に押し込むことにより、筒体部１４ａの先端縁が係合爪２４に当接し、係合爪２４を外周側へ押し込む。このため、係合爪２４と外周段差１２の係合状態、すなわち、差し具１０と受け具２０の結合状態が解除される。これにより、軸線方向の引き離し力を加えると差し具１０と受け具２０を取り外すことができる。   On the other hand, in a state where the joining tool 10 and the receiving tool 20 are joined, the tip end edge of the cylindrical portion 14a is pushed by pushing the release member (push ring) 14 toward the receiving port 20a in a posture of putting a finger on the flange portion 14b. Contacts the engaging claws 24 and pushes the engaging claws 24 outward. For this reason, the engagement state of the engagement claw 24 and the outer peripheral step 12, that is, the coupled state of the plug 10 and the receiver 20 is released. Thereby, the plug 10 and the receiver 20 can be removed when an axial pulling force is applied.

図１０（ａ）〜（ｃ）には従来の係合爪２４の概略形状を示す。ここで、図１０（ａ）は、受け具２０の内周側から半径方向外側に係合爪２４を見たときの様子を示す内面図、図１０（ｂ）は、受け具２０の軸線方向先端側から係合爪２４を見たときの正面図、図１０（ｃ）は、円周方向に係合爪２４を見たときの側面図である。   10 (a) to 10 (c) show schematic shapes of the conventional engaging claws 24. FIG. Here, FIG. 10 (a) is an inner view showing the engagement claw 24 seen radially outward from the inner peripheral side of the receptacle 20, and FIG. 10 (b) is an axial direction of the receptacle 20. FIG. 10C is a front view of the engaging claw 24 as viewed from the front end side, and FIG. 10C is a side view of the engaging claw 24 as viewed in the circumferential direction.

係合爪２４は、受け具２０の内周側を向いた内周面２４ａと、この内周面２４ａの基端側（図１０（ａ）及び（ｃ）では図示上側）に稜線を介して隣接する係合面２４ｂと、内周面２４ａの円周方向両側に稜線を介して隣接する左右の側面２４ｃとを備えている。なお、本明細書で言う円周方向とは、受け口２０ａの軸線の周りに回転する方向を言う。また、内周面２４ａ、係合面２４ｂ及び左右の側面２４ｃの外周側（図１０（ｂ）及び図１０（ｃ）の図示下側）には、爪座２６の内部（外周側）に保持される基台部２４ｄが設けられる。この基台部２４ｄには、軸線方向の両側に形成された枠部２４ｅと、この枠部２４ｅの内側に円弧状に形成された外周面２４ｆと、この外周面２４ｆの中央に突設され、上記ばね部材２５に対して貫通した状態でカシメ固定されるボス２４ｇとが設けられている。   The engagement claws 24 are formed on the inner peripheral surface 24a facing the inner peripheral side of the receiving tool 20 and the base end side of the inner peripheral surface 24a (on the upper side in FIGS. 10A and 10C) via a ridgeline. An adjacent engagement surface 24b and left and right side surfaces 24c adjacent to each other on both sides in the circumferential direction of the inner circumferential surface 24a via ridge lines are provided. In addition, the circumferential direction said by this specification means the direction rotated around the axis line of the receptacle 20a. In addition, the inner circumferential surface 24a, the engagement surface 24b, and the outer peripheral side of the left and right side surfaces 24c (the lower side in FIG. 10B and FIG. 10C) The base portion 24d is provided. The base portion 24d is provided with a frame portion 24e formed on both sides in the axial direction, an outer peripheral surface 24f formed in an arc shape inside the frame 24e, and a center of the outer peripheral surface 24f. A boss 24g fixed by caulking in a state of penetrating the spring member 25 is provided.

内周面２４ａは、受け口２０ａの内部において、先端外周側にある外縁ｏから基端内周側にある内縁ｉへ斜めに向かう傾斜面部２４ａ１と、この傾斜面部２４ａ１の内縁ｉに続いて稜線を介して隣接する内周縁部２４ａ２とを有する。傾斜面部２４ａ１と内周縁部２４ａ２とは、いずれも、受け口２０ａの内部において、円周方向に沿った凹円弧状に構成される。また、傾斜面部２４ａ１は、上記外縁ｏから上記内縁ｉに向けた方向に沿って凸曲面状の輪郭を備えた表面を備えている。一方、内周縁部２４ａ２は、ＪＩＳに規定される「つめ」の寸法ｔ２≧２．０ｍｍ（呼び径６５ｍｍの場合）の条件となるように形成される幅を備えた円弧状の凹曲面である。内周縁部２４ａ２の曲率は、ＪＩＳにおいて曲率半径Ｒａ＝Ｄ／２＝３２．２５ｍｍ（呼び径６５ｍｍの場合）となるように規定されている。内周縁部２４ａ２は、軸線方向に見ると平坦な形状となるように形成されている。 The inner peripheral surface 24a has a slope following the inner edge i of the inclined surface portion 24a1 and an inclined surface portion 24a1 diagonally extending from the outer edge o on the outer periphery of the tip to the inner edge i on the inner periphery of the proximal end inside the receptacle 20a. And an inner peripheral edge 24a2 adjacent thereto. Each of the inclined surface portion 24a1 and the inner peripheral edge portion 24a2 is formed in a concave arc shape along the circumferential direction inside the receptacle 20a. Further, the inclined surface portion 24a1 has a surface having a convex curved contour along the direction from the outer edge o toward the inner edge i. On the other hand, the inner peripheral edge portion 24a2 is an arc-shaped concave surface having a width which is formed to satisfy the condition of the dimension t 2 2.02.0 mm (in the case of the nominal diameter 65 mm) of the "nail" specified in JIS. is there. The curvature of the inner peripheral edge portion 24a2 is defined to be curvature radius Ra = D / 2 = 32.25 mm (in the case of nominal diameter 65 mm) in JIS. The inner peripheral edge portion 24a2 is formed to have a flat shape when viewed in the axial direction.

係合爪２４の各所の寸法はＪＩＳに規定されている。例えば、内周面２４ａの軸線周りの接線方向の長さは?１＝３６ｍｍ（呼び径６５ｍｍの場合）、基台部２４ｄの同長さは?２＝４２ｍｍ（呼び径６５ｍｍの場合）である。ただし、傾斜面部２４ａ１の軸線と直交する仮想平面上における曲率は規定されていない。しかし、一般的には係合爪２４を切削加工などで形成するため、製造上の制約から内周縁部２４ａ２と同じ曲率となるように形成される。なお、係合爪２４の一般的な材質はＣＡＣ４０３などの銅合金である。 The dimensions of each part of the engagement claw 24 are defined in JIS. For example, the tangential length of the inner peripheral surface 24a about the axis line is 1 = 36 mm (in the case of nominal diameter 65 mm), and the same length of the base portion 24 d is 2 = 42 mm (in the case of nominal diameter 65 mm) . However, the curvature on the virtual plane orthogonal to the axis of the inclined surface portion 24a1 is not defined. However, since the engaging claws 24 are generally formed by cutting or the like, they are formed to have the same curvature as the inner peripheral edge portion 24a2 due to manufacturing limitations. In addition, the general material of the engaging claw 24 is a copper alloy such as CAC403.

次に、図１乃至図８を参照して、本実施形態の差込式結合継手の差し具と受け具の構造について説明する。なお、本実施形態では、差し具１０は上記従来構造と全く同様に構成でき、受け具２０′も係合爪２４′以外は上記受け具２０と同様に構成できる。このため、本実施形態において、上述の従来構造と同様の部分の説明は省略する。また、本実施形態は、上記従来構造と同様にＪＩＳに規定される寸法に設定されるので、従来構造やＪＩＳに規定される構成についても説明を省略する。   Next, with reference to FIGS. 1-8, the structure of the plug and receiver of the plug-in type coupling joint of this embodiment is demonstrated. In the present embodiment, the plug 10 can be configured in exactly the same manner as the above-described conventional structure, and the receptacle 20 'can be configured in the same manner as the receptacle 20 except for the engaging claws 24'. Therefore, in the present embodiment, the description of the same portions as those of the above-described conventional structure will be omitted. Further, since the present embodiment is set to the dimensions defined in JIS in the same manner as the above-described conventional structure, the description of the configuration in accordance with the conventional structure and JIS is also omitted.

ここで、図１（ａ）は係合爪２４′の内面図、図１（ｂ）は係合爪２４′を受け具２０′の軸線方向先端側から見た正面図、図１（ｃ）は係合爪２４′を受け具２０′の軸線方向基端側から見た背面図、図１（ｄ）は図１（ｂ）のＤ−Ｄ線に沿った断面を示す断面図、図１（ｅ）は図１（ｂ）のＥ−Ｅ線に沿った断面を示す断面図である。また、図２（ａ）は図２（ｃ）のＡ−Ａ線に沿った断面を示す断面図、図２（ｂ）は係合爪２４′の外面図、図２（ｃ）は係合爪２４′の円周方向に見た側面図である。   Here, FIG. 1 (a) is an inner view of the engaging claw 24 ', and FIG. 1 (b) is a front view as viewed from the tip end side of the engaging claw 24' in the axial direction of FIG. 1 (c). FIG. 1 (d) is a cross-sectional view taken along the line D-D of FIG. 1 (b), and FIG. (E) is a cross-sectional view showing a cross section taken along the line E-E in FIG. 2 (a) is a cross-sectional view taken along the line A-A of FIG. 2 (c), FIG. 2 (b) is an external view of the engagement claw 24 ', and FIG. 2 (c) is an engagement It is the side view seen in the circumferential direction of nail | claw 24 '.

この係合爪２４′は、内周面２４ａ′のうちの傾斜面部２４ａ１′の少なくとも或る領域内における軸線と直交する仮想平面上の曲率が以下のように構成される。すなわち、曲率半径Ｒｂ＝ｄ１／２＝３４．２５ｍｍ（呼び径６５ｍｍの場合）となるような曲率である。ここで、ｄ１はＪＩＳに規定される「差し金具」の寸法であり、ｄ１＝６８．５ｍｍ（呼び径６５ｍｍの場合）である。本実施形態では、上記のように、傾斜面部２４ａ１′において、上記仮想平面上の曲率が差し具１０の先端縁部１１の外径ｄ１の外周面と同じになる領域が設定される。この領域は、外縁ｏから内縁ｉまでの傾斜面部２４ａ１′の全範囲のうち、後述する結合作業の初期段階において、差し具１０の差し口の先端縁部１１の外周側の角部が最初に接触する半径方向の位置を含む。一般的には、上記領域は、外側境界ｏ′から内側境界ｉ′までの領域である。ただし、図示例では、上記領域は内周縁部２４ａ２′，２４ａ３′との境界である内縁ｉまでの範囲となっているため、内側境界ｉ′は点線で示してある。 The engaging claw 24 'has a curvature on an imaginary plane perpendicular to the axis in at least a region of the inclined surface portion 24a1' of the inner peripheral surface 24a 'as follows. That is, the curvature radius Rb = d 1 /2=34.25 mm (in the case of the nominal diameter 65 mm). Here, d 1 is the dimension of the “fitting” defined in JIS, and d 1 = 68.5 mm (in the case of the nominal diameter of 65 mm). In the present embodiment, as described above, the inclined surface portion 24a1 ', region curvature on the imaginary plane is the same as the outer peripheral surface of the outer diameter d 1 of the leading edge 11 of the insert member 10 is set. In this area, in the entire range of the inclined surface portion 24a1 'from the outer edge o to the inner edge i, the corner on the outer circumferential side of the tip edge 11 of the fore end of the fore end of the plug is first Includes the radial position of contact. Generally, the area is the area from the outer boundary o 'to the inner boundary i'. However, in the illustrated example, the above-mentioned region is a range up to the inner edge i which is the boundary between the inner peripheral edge portions 24a2 'and 24a3', so the inner boundary i 'is shown by a dotted line.

一方、内周縁部２４ａ２′，２４ａ３′のうちの左右の両端部を除く少なくとも主体部分２４ａ２′の上記仮想平面上の曲率は、従来と同様に、ＪＩＳに規定されるように、曲率半径Ｒａ＝Ｄ／２＝３２．２５ｍｍ（呼び径６５ｍｍの場合）となるような曲率である。ここで、ＤはＪＩＳに規定される「つめ」の寸法であり、Ｄ＝６４．５ｍｍ（呼び径６５ｍｍの場合）である。図示例の場合、傾斜面部２４ａ１′の外縁ｏにおける上記仮想平面上の曲率は、曲率半径Ｒｃ＝Ｓ／２＝３６．７ｍｍ（呼び径６５ｍｍの場合）となるような曲率である。ここで、内径寸法Ｓ＝７３．４ｍｍ（呼び径６５ｍｍの場合）は、ＪＩＳに規定される「つめ」の寸法Ｄ＝６４．５ｍｍ（呼び径６５ｍｍの場合）より大きく、ＪＩＳに規定される「つめ」の寸法ｄ＝８２．０ｍｍ（呼び径６５ｍｍの場合）の間の値（好ましくは中間値）である。   On the other hand, the curvature on the imaginary plane of at least the main portion 24a2 'excluding the left and right ends of the inner peripheral edge portions 24a2' and 24a3 'is the curvature radius Ra = as defined in JIS, as in the conventional case. The curvature is such that D / 2 = 32.25 mm (in the case of the nominal diameter of 65 mm). Here, D is the dimension of the "thaw" specified in JIS, and D is 64.5 mm (in the case of the nominal diameter of 65 mm). In the case of the illustrated example, the curvature on the virtual plane at the outer edge o of the inclined surface portion 24a1 'is such that the curvature radius Rc = S / 2 = 36.7 mm (in the case of the nominal diameter of 65 mm). Here, the inner diameter dimension S = 73.4 mm (in the case of the nominal diameter 65 mm) is larger than the dimension D = 64.5 mm (in the case of the nominal diameter 65 mm) of the "thaw" prescribed in JIS, and prescribed in JIS The value “d” (preferably, the median value) is between the dimension “d” of 80.0 mm (in the case of the nominal diameter of 65 mm).

ここで、図示例では、内周縁部の主体部分２４ａ２′の曲率は、上記のように外周段差１２の小径側部分１２ａの曲率に近い曲率となっているが、内周縁部の両端部２４ａ３′の曲率は、主体部分２４ａ２′の曲率よりも外周段差１２の大径側部分１１ａの曲率に近いことが好ましい。図示例の場合、両端部２４ａ３′の曲率は、曲率半径がｄ／２＝３４．２５ｍｍ、ｄ＝６８．５ｍｍ（呼び径６５ｍｍの場合）である曲率、すなわち、上記大径側部分１１ａの曲率と同じ曲率となっている。なお、この場合においては、傾斜面部２４ａ１′の内縁ｉのうちの、内周縁部の両端部２４ａ３′と傾斜面部２４ａ１′の境界にある内縁ｉの部分においては、両側にある表面の上記仮想平面上の曲率は相互に同じである。ただし、当該内縁ｉの部分の両側にある表面は、軸線方向に沿った方向の傾斜角が相互に異なっている（軸線に対して傾斜しているか否かで異なっている）。   Here, in the illustrated example, the curvature of the main portion 24a2 'of the inner peripheral edge portion is a curvature close to the curvature of the small diameter side portion 12a of the outer peripheral step 12 as described above, but both end portions 24a3' of the inner peripheral edge portion It is preferable that the curvature of is closer to the curvature of the large diameter side portion 11 a of the outer peripheral step 12 than the curvature of the main portion 24 a 2 ′. In the case of the illustrated example, the curvatures of the both end portions 24a3 'are curvatures such that the curvature radius is d / 2 = 34.25 mm and d = 68.5 mm (in the case of nominal diameter 65 mm), that is, the curvature of the large diameter side portion 11a. It has the same curvature as. In this case, of the inner edge i of the inclined surface portion 24a1 ', the portion of the inner edge i at the boundary between the end portion 24a3' of the inner peripheral edge and the inclined surface portion 24a1 ' The curvatures above are identical to one another. However, the surfaces on both sides of the portion of the inner edge i have different inclination angles in the direction along the axial direction (different depending on whether they are inclined with respect to the axis).

傾斜面部２４ａ１では、外縁ｏからの立ち上がり部分の外側境界ｏ′までの曲率が徐々に小さくなり、外側境界ｏ′上での曲率は、曲率半径Ｒｂ＝ｄ１／２＝３４．２５ｍｍ（呼び径６５ｍｍの場合）となるような曲率となる。そして、図示例では、この外側境界ｏ′から内縁ｉまでの領域では、傾斜面部２４ａ１′は、上述のようにＲｂ＝ｄ１／２＝３４．２５ｍｍ（呼び径６５ｍｍの場合）となるような一定の曲率を有する。ここで、上記傾斜面部２４ａ１′と内周縁部の主体部分２４ａ２′との間の部分においては、或いは、図示例とは異なる態様として、上記内周縁部に両端部２４ａ３′が設けられない場合においては、内縁ｉは、上記仮想平面上の曲率が異なる境界線となっている。ただし、上記部分において、或いは、上記場合においては、上記曲率を有する領域の範囲を、内縁ｉよりも外側境界ｏ′に近い位置にある図示点線で示す内側境界ｉ′までとしてもよい。この場合、内側境界ｉ′から内縁ｉまでの間は、上記仮想平面上の曲率が上記領域内の曲率から徐々に大きくなって、最終的に内縁ｉにおいて内周縁部２４ａ２′の曲率と一致するように、漸次変化させてもよい。これにより、後述する結合作業の初期段階から中間段階への移行時の挿入動作を円滑化させたり、安定化させたりすることができる。 In the inclined surface portion 24a1, the curvature from the outer edge o to the outer boundary o 'gradually decreases, and the curvature on the outer boundary o' is as follows: radius of curvature Rb = d1 / 2 = 34.25 mm (nominal diameter In the case of 65 mm, the curvature is as follows. In the illustrated example, in the region from the outer boundary o ′ to the inner edge i, the inclined surface portion 24a1 ′ is such that Rb = d 1 /2=34.25 mm (in the case of the nominal diameter 65 mm) as described above It has a constant curvature. Here, in the portion between the inclined surface portion 24a1 'and the main portion 24a2' of the inner peripheral edge, or as a mode different from the illustrated example, in the case where the both end portions 24a3 'are not provided in the inner peripheral edge. The inner edge i is a boundary where the curvatures on the virtual plane are different. However, in the above-mentioned portion or in the above-mentioned case, the range of the region having the above-mentioned curvature may be up to the inner boundary i ′ shown by a dotted line in the drawing closer to the outer boundary o ′ than the inner edge i. In this case, the curvature on the imaginary plane gradually increases from the curvature in the region from the inner boundary i 'to the inner edge i, and finally coincides with the curvature of the inner peripheral edge 24a2' at the inner edge i. As such, they may be gradually changed. This makes it possible to smooth or stabilize the insertion operation at the time of transition from the initial stage to the intermediate stage of the joining operation described later.

なお、上記領域は、上記傾斜面部２４ａ１′のうちの先端縁部１１の外周側の角部１１ｐが結合作業の初期において最初に接触する表面部位、或いは、先端縁部１１の外周側の角部１１ｐの半径方向の位置に対応する表面部位、を含む範囲であればよい。例えば、上記領域は、外側境界ｏ′から内側境界ｉ′までの範囲を少なくとも含む範囲であればよい。このとき、外縁ｏから外側境界ｏ′までの範囲や、内側境界ｉ′から内縁ｉまでの範囲は任意である。もちろん、上記領域を、外縁ｏから内側境界ｉ′までの範囲、或いは、外縁ｏから内縁ｉまでの範囲、外側境界ｏ′から内縁ｉまでの範囲としても構わない。   In the above-mentioned region, the corner 11p on the outer peripheral side of the tip edge portion 11 of the inclined surface portion 24a1 'is a surface portion that is first contacted at the beginning of the bonding operation, or the corner portion on the outer peripheral side of the tip edge 11 The surface area corresponding to the radial position of 11p may be included. For example, the area may be a range including at least the range from the outer boundary o ′ to the inner boundary i ′. At this time, the range from the outer edge o to the outer boundary o ′ and the range from the inner boundary i ′ to the inner edge i are arbitrary. Of course, the above region may be a range from the outer edge o to the inner boundary i ', a range from the outer edge o to the inner edge i, and a range from the outer boundary o' to the inner edge i.

なお、一般的には、上記領域内の上記仮想平面上の曲率は、上記のように一定である必要はない。また、上記領域内の上記仮想平面上の曲率は、外周段差１２の小径側部分１２ａの曲率より小さく、かつ、小径側部分１２ａの曲率よりも大径側部分１１ａの曲率に近ければよい。この場合において、上記領域内の上記仮想平面上の曲率は、大径側部分１１ａの曲率以下であることが望ましい。ここで、上記領域内の上記仮想平面上の曲率は、大径側部分１１ａの曲率と一致する曲率であってもよい。   In general, the curvature on the virtual plane in the area does not have to be constant as described above. The curvature on the imaginary plane in the region may be smaller than the curvature of the small diameter side portion 12a of the outer peripheral step 12, and closer to the curvature of the large diameter side portion 11a than the curvature of the small diameter side portion 12a. In this case, it is desirable that the curvature on the imaginary plane in the region is equal to or less than the curvature of the large diameter side portion 11a. Here, the curvature on the virtual plane in the region may be a curvature that matches the curvature of the large diameter side portion 11a.

或いはまた、上記領域内の上記仮想平面上の曲率は、内周縁部の主体部分２４ａ２′の曲率より小さければよい。この場合において、上記領域内の上記仮想平面上の曲率は、内周縁部の主体部分２４ａ２′の曲率よりも大径側部分１１ａの曲率に近いことが好ましい。この場合においても、上記領域の上記仮想平面上の曲率は、大径側部分１１ａの曲率以下であることが望ましい。   Alternatively, the curvature on the imaginary plane in the region may be smaller than the curvature of the main portion 24a2 'of the inner peripheral edge. In this case, the curvature on the imaginary plane in the region is preferably closer to the curvature of the large diameter side portion 11a than the curvature of the main portion 24a2 'of the inner peripheral edge portion. Also in this case, it is desirable that the curvature of the region on the imaginary plane be equal to or less than the curvature of the large diameter portion 11a.

なお、係合爪２４′には、傾斜面部２４ａ１′と側面２４ｃ′との間の稜線部Ｊ１、及び、内周縁部２４ａ２′又は２４ａ３′と側面２４ｃ′との間の稜線部Ｊ２などの端縁角部が設けられている。従来構造では、これらの端縁角部は、基本的に糸面取りと呼ばれる程度の幅０．１〜０．２ｍｍ程度の面取り形状、或いは、半径０．１〜０．２ｍｍ程度の丸め形状であることが通常であった。しかし、本実施形態では、上記稜線部Ｊ１及びＪ２は、半径０．３ｍｍの丸め形状、若しくは、幅０．５ｍｍの面取り形状を備える。ただし、稜線部Ｊ１及びＪ２において、半径０．３ｍｍよりも大きな半径、例えば、０．５ｍｍ若しくはこれ以上の半径（例えば、半径０．８ｍｍ）の丸め形状を設けるようにしてもよい。また、当該稜線部Ｊ１及びＪ２において、幅１．０ｍｍ以上（例えば、幅１．５ｍｍ）の面取り形状を設けるようにしてもよい。これにより、結合作業の初期段階及び中間段階において、先端縁部１１の外周面上の係合爪２４′の半径方向の高さを低減することができる。このため、係合爪２４′の出没動作のストローク余裕を確保できるという作用がもたらされる。また、このような稜線部Ｊ１及びＪ２の角部形状がなだらかになることにより、本発明に係る主要な作用である、係合爪２４′が円周方向に力を受けることを抑制するという作用をさらに高めることができる。   The engagement claw 24 'includes an end such as a ridge J1 between the inclined surface 24a1' and the side 24c 'and a ridge J2 between the inner peripheral edge 24a2' or 24a3 'and the side 24c'. Edge corners are provided. In the conventional structure, these edge corner portions basically have a chamfered shape with a width of about 0.1 to 0.2 mm, which is generally called thread chamfering, or a rounded shape with a radius of about 0.1 to 0.2 mm. That was normal. However, in the present embodiment, the ridge portions J1 and J2 have a rounded shape with a radius of 0.3 mm or a chamfered shape with a width of 0.5 mm. However, in the ridge portions J1 and J2, a rounded shape having a radius larger than the radius of 0.3 mm, for example, a radius of 0.5 mm or more (for example, a radius of 0.8 mm) may be provided. In addition, a chamfered shape having a width of 1.0 mm or more (for example, a width of 1.5 mm) may be provided in the ridge portions J1 and J2. This makes it possible to reduce the radial height of the engaging claws 24 ′ on the outer peripheral surface of the leading edge 11 at the initial and intermediate stages of the bonding operation. For this reason, the effect | action of being able to ensure the stroke allowances of the protrusion-and-retraction operation | movement of engaging claw 24 'is brought about. In addition, since the corner portions of the ridge portions J1 and J2 become smooth, the main function according to the present invention, that the engagement claw 24 'is restrained from receiving a force in the circumferential direction. Can be further enhanced.

なお、左右の上記稜線部Ｊ２に隣接する左右の両端部２４ａ３′の表面を、図１に示すように、小径側部分１２ａ（或いは、内周縁部の主体部分２４ａ２′）の曲率よりも小さい曲率、例えば、曲率半径Ｒｂ＝ｄ１／２＝３４．２５ｍｍ（呼び径６５ｍｍの場合）となるような曲率、或いは、これに近い曲率にすると、以下の効果を得ることができる。すなわち、後述する結合作業の中間段階における先端縁部１１の外周面上の係合爪２４′の半径方向高さをさらに低減できる。これにより結合作業の中間段階における係合爪２４′の半径方向のストローク余裕をさらに増大できる。また、当該外周面との間を面接触状態若しくはこれに近い状態とすることができるため、両者の間の接触部分の損傷が低減され、耐久性も向上する。 As shown in FIG. 1, the surface of the left and right end portions 24a3 'adjacent to the left and right ridge lines J2 has a curvature smaller than the curvature of the small diameter side portion 12a (or the main portion 24a2' of the inner peripheral edge portion). For example, the following effects can be obtained by setting the curvature radius Rb = d 1/2 /3=4.25 mm (in the case of the nominal diameter 65 mm) or a curvature close to this. That is, it is possible to further reduce the radial height of the engaging claws 24 'on the outer peripheral surface of the tip end edge portion 11 in the middle stage of the bonding operation described later. This can further increase the radial stroke allowance of the engagement claws 24 'in the middle stage of the coupling operation. In addition, since the outer peripheral surface can be brought into a surface contact state or a state close thereto, damage to the contact portion between the both can be reduced, and the durability can also be improved.

本実施形態の係合爪２４′は、図１（ｅ）並びに図２（ａ）及び（ｂ）に示すように、上記内周面２４ａ′を形成する内周壁Ｂａと、この内周壁Ｂａと稜線部を介して隣接し、上記係合面２４ｂ′を形成する係合壁Ｂｂと、内周壁Ｂａと係合壁Ｂｂの双方に隣接し、上記側面２４ｃ′を形成する左右の側面壁Ｂｃとを備えている。また、基台部２４ｄ′には、上記内周壁Ｂａに対して稜線部（外縁ｏ）を介して延在された側面壁Ｂｄと、係合壁Ｂｂに沿って延長された形態の側面壁Ｂｅが設けられている。そして、係合爪２４′は、上記内周壁Ｂａ、上記係合壁Ｂｂ及び側面壁Ｂｅ、上記側面壁Ｂｄ、並びに、上記左右の側面壁Ｂｃとが一体に構成され、内周面２４ａ′の背面側が開放された形状の箱型構造を備えている。   As shown in FIG. 1 (e) and FIGS. 2 (a) and 2 (b), the engaging claw 24 'of this embodiment includes an inner peripheral wall Ba forming the above-mentioned inner peripheral surface 24a', and the inner peripheral wall Ba and An engagement wall Bb adjacent via a ridge line portion to form the engagement surface 24b ', and left and right side walls Bc adjacent to both the inner peripheral wall Ba and the engagement wall Bb to form the side surface 24c' Is equipped. Further, in the base portion 24d ', a side wall Bd extended via the ridge line portion (outer edge o) with respect to the inner peripheral wall Ba, and a side wall Be of a form extended along the engagement wall Bb. Is provided. The engaging claw 24 'is formed integrally with the inner peripheral wall Ba, the engaging wall Bb and the side wall Be, the side wall Bd, and the left and right side walls Bc. It has a box-like structure with an open back side.

上記箱型構造の内部には、上記内周壁Ｂａの内側面に接続されるとともに、上記側面壁Ｂｄと上記係合壁Ｂｂ及び側面壁Ｂｅとの間を繋ぐように、一体に構成された補強リブ構造Ｃａ，Ｃｂ，Ｃｃが設けられる。また、中央の補強リブ構造Ｃａの底部にはばね部材２５と接続するための構造（図示例ではボス）２４ｇ′が突設されている。なお、補強リブ構造Ｃａ，Ｃｂ，Ｃｃは、少なくとも、内周壁Ｂａと係合壁Ｂｂに一体に形成されていれば、結合作業に関する強度や耐久性を向上させることができる。   Inside the box-shaped structure, reinforcement integrally formed so as to connect between the side wall Bd and the engaging wall Bb and the side wall Be while being connected to the inner side surface of the inner peripheral wall Ba Rib structures Ca, Cb and Cc are provided. At the bottom of the central reinforcing rib structure Ca, a structure (a boss in the illustrated example) 24g 'for connecting with the spring member 25 is provided in a protruding manner. If the reinforcing rib structures Ca, Cb, and Cc are integrally formed at least on the inner circumferential wall Ba and the engagement wall Bb, the strength and durability of the bonding operation can be improved.

本実施形態の係合爪２４′は、各種の粉体を焼結させた焼結材（具体的には金属粉を用いて焼結させた金属焼結材）によって構成される。金属としては、例えば、ＳＵＳ６３０やＳＵＳ３０４などのステンレス鋼を用いることができる。このような焼結体は、金属の粉末をバインダとともに圧縮成形し、高温度で焼結させることによって形成できる。この場合に、一般的な粉末冶金技術（プレス成形法）の他に、金属粉末射出成型法を用いることも可能である。また、係合爪２４′は、焼結体ではないが、型成形を行う点では上記と共通する、ダイキャスト法などの鋳造法を用いた鋳造材や、冷間鍛造法などの鍛造法を用いた鍛造材であってもよい。   The engaging claws 24 'of the present embodiment are formed of a sintered material (specifically, a metal sintered material sintered using metal powder) obtained by sintering various powders. As the metal, for example, stainless steel such as SUS630 or SUS304 can be used. Such a sintered body can be formed by compression molding metal powder with a binder and sintering at a high temperature. In this case, it is also possible to use metal powder injection molding in addition to general powder metallurgy technology (press molding). In addition, although the engaging claw 24 'is not a sintered body, it is common to the above in that molding is performed, and a casting material using a casting method such as die casting or a forging method such as cold forging It may be a forged material used.

上記の製造法による利点は、切削加工などを行う場合に比べて特殊な面形状（特に、本発明に係る係合爪２４′の内周面２４ａ′の表面形状）を形成しやすい点と、切削代を不要とすることにより原材料コストを低減できる点である。また、本実施形態では、傾斜面部２４ａ１′に内周縁部の主体部分２４ａ２′や小径側部分１２ａの曲率よりも小さな曲率を備える領域を設けたことにより、結合作業の初期において内周面２４ａ′の円周方向の広い範囲で先端縁部１１と接触し易くなる。このことから、係合爪２４′の内周壁Ｂａなどの肉厚を薄くしても、相互に衝突する係合爪２４′の内周面２４ａ′と先端縁部１１の損傷を軽減することができ、耐久性も向上できる。したがって、金属粉などの原材料コストをさらに低減できる。また、係合爪２４′の軽量化を図ることができる。   The advantage of the above manufacturing method is that it is easy to form a special surface shape (in particular, the surface shape of the inner peripheral surface 24a 'of the engaging claw 24' according to the present invention) as compared to the case of cutting and the like. Raw material costs can be reduced by eliminating the need for cutting allowances. Further, in the present embodiment, by providing the inclined surface portion 24a1 'with a region having a curvature smaller than the curvature of the main portion 24a2' of the inner peripheral edge portion and the small diameter side portion 12a, the inner peripheral surface 24a 'is It becomes easy to contact tip edge 11 in a wide range in the circumferential direction. From this, even if the thickness of the inner peripheral wall Ba and the like of the engaging claw 24 'is reduced, damage to the inner peripheral surface 24a' and the tip edge 11 of the engaging claw 24 'which collide with each other can be reduced. The durability can also be improved. Therefore, the cost of raw materials such as metal powder can be further reduced. Further, the weight of the engaging claws 24 'can be reduced.

図３〜図５は、本実施形態の差込式結合継手の結合作業の初期段階、中間段階及び完了段階の各状態をそれぞれ示す断面図である。また、図６〜図８は、上記の各段階について従来構造及び本実施形態の係合爪と差し口１０ａの先端部との関係をそれぞれ示す拡大図（ａ）及び（ｂ）である。   FIGS. 3-5 is sectional drawing which shows each state of the initial stage of the joint operation of the plug-in type coupling joint of this embodiment, an intermediate stage, and each completion | finish stage. 6 to 8 are enlarged views (a) and (b) showing the relationship between the engaging claw of the conventional structure and the present embodiment and the tip of the insertion port 10a in each of the above steps.

最初に、図３及び図６を参照して結合作業の初期段階について説明する。図３に示すように、受け具２０′の受け口２０ａ内に、差し具１０の差し口１０ａを挿入する。このとき、差し具１０の先端縁部１１の外周側の角部１１ｐが係合爪２４′の上記傾斜面部２４ａ１′に当接し、係合爪２４′を爪座２６の開口２６ａ内へ没する方向（外周側）に移動させる。なお、上記の領域は、先端縁部１１の外周側の角部１１ｐが最初に接触する傾斜面部２４ａ１′の部分を含む。また、上記の領域は、先端縁部１１の外周側の角部１１ｐの半径方向の位置に対応する傾斜面部２４ａ１′の表面部位よりも上記外縁ｏの側にある外側境界ｏ′と、上記表面部位より上記内縁ｉの側にある内側境界ｉ′との間の範囲を少なくとも有する。   First, the initial stages of the joining operation will be described with reference to FIGS. 3 and 6. As shown in FIG. 3, the socket 10a of the plug 10 is inserted into the socket 20a of the receiver 20 '. At this time, the corner 11p on the outer peripheral side of the tip end edge 11 of the insertion tool 10 abuts on the inclined surface 24a1 'of the engaging claw 24' and sinks the engaging claw 24 'into the opening 26a of the claw seat 26. Move in the direction (outer side). The above-mentioned region includes the portion of the inclined surface portion 24a1 'where the corner 11p on the outer peripheral side of the distal end edge 11 first contacts. Further, the above-mentioned region is an outer boundary o ′ on the outer edge o side with respect to the surface portion of the inclined surface portion 24a1 ′ corresponding to the radial position of the corner 11p on the outer peripheral side of the distal end edge 11, It has at least a range between the portion and the inner boundary i 'which is closer to the inner edge i than the portion.

このとき、従来構造では、図６（ａ）に示すように、内周面２４ａの傾斜面部２４ａ１の上記領域は、受け口２０ａの軸線と直交する仮想平面上の曲率が先端縁部１１の外周面の曲率より大きい。このため、傾斜面部２４ａ１の上記仮想平面上の表面位置ｓと先端縁部１１の外周側の角部１１ｐとの間において、円周方向の中央部分で隙間ｇが生じる。このため、先端縁部１１の外周側の角部１１ｐは傾斜面部２４ａ１の左右の稜線部だけに接触して点状の接触部ｔｅが生ずる。ただし、図示の場合は、差し口１０ａが受け口２０ａの中心位置に挿入されるとともに、差し口１０ａと受け口２０ａの軸線が一致している様子を示している。しかし、実際には、差し口１０ａが受け口２０ａに対して偏心した位置に挿入されたり、差し口１０ａの軸線が受け口２０ａの軸線に対して僅かに傾斜した姿勢で挿入されたりする。このため、一つの係合爪２４の左右の稜線部のうちの一方の稜線部だけに接触部ｔｅが生じて先端縁部１１の外周側の角部１１ｐが当接し、それによって係合爪２４が円周方向に力を受ける結果、爪座２６の開口２６ａに対する係合爪２４の出没動作が円滑さを欠くようになる場合がある。   At this time, in the conventional structure, as shown in FIG. 6A, in the above-mentioned region of the inclined surface portion 24a1 of the inner peripheral surface 24a, the curvature on the imaginary plane orthogonal to the axis of the receptacle 20a is the outer peripheral surface of the tip edge portion 11. The curvature of For this reason, a gap g is generated at the central portion in the circumferential direction between the surface position s on the imaginary plane of the inclined surface portion 24a1 and the corner portion 11p on the outer peripheral side of the tip end edge portion 11. For this reason, the corner 11p on the outer peripheral side of the tip end edge 11 contacts only the left and right ridges of the inclined surface 24a1 to form a point-like contact portion te. However, in the case of illustration, while the socket 10a is inserted in the center position of the socket 20a, it has shown that the axial line of the socket 10a and the socket 20a correspond. However, in practice, the insertion slot 10a is inserted at a position eccentric to the receptacle 20a, or the axis of the insertion port 10a is inserted in a posture slightly inclined to the axis of the receptacle 20a. Therefore, the contact portion te is generated only at one of the left and right ridge portions of one engaging claw 24 and the corner 11p on the outer peripheral side of the leading edge 11 abuts, whereby the engaging claw 24 is engaged. As a result of circumferential forces being applied, the projecting and retracting motion of the engaging claw 24 with respect to the opening 26a of the claw seat 26 may become less smooth.

例えば、図示例のように円周方向に三つの係合爪２４が配置される場合であれば、従来構造では、円周方向の六ケ所の接触点で先端縁部１１の角部１１ｐが規制され得る。しかし、差し口１０ａが受け口２０ａの軸線に対して僅かに偏心したり傾いたりしていると、係合爪２４は、或る接触点では大きく力を受けるものの、他の接触点では力を受けないといったことが生じる。そして、力を受ける接触点の位置が各係合爪２４の円周方向の端部にある稜線部（接触部ｔｅ）にあることから、係合爪２４には半径方向の力成分よりむしろ円周方向の力成分が生じ易くなる。この結果、係合爪２４が角部１１ｐに押されて爪座２６の開口２６ａ内に没する動作がスムーズに行われ難くなるので、結合作業の初期段階において差し口１０ａが受け口２０ａに挿入し難くなり、突き当りや引っかかりが生じ易くなる。   For example, in the case where three engaging claws 24 are arranged in the circumferential direction as in the illustrated example, in the conventional structure, the corner 11p of the leading edge 11 is restricted at six contact points in the circumferential direction. obtain. However, when the insertion port 10a is slightly eccentric or inclined with respect to the axis of the receptacle 20a, the engagement claw 24 receives a large force at a certain contact point, but receives a force at another contact point. There will be no such thing. And, since the position of the contact point receiving the force is at the ridge portion (contact portion te) at the circumferential end of each engaging claw 24, the engaging claw 24 has a circle rather than a radial force component. A circumferential force component is likely to occur. As a result, the engaging claw 24 is pushed by the corner 11p and the operation of sinking into the opening 26a of the claw seat 26 is difficult to be smoothly performed, so the insertion port 10a is inserted into the receptacle 20a in the initial stage of the joining operation. It becomes difficult, and it is easy to hit and get stuck.

一方、本実施形態では、図６（ｂ）に示すように、内周面２４ａ′の傾斜面部２４ａ１′の上記領域において、上記仮想平面上の曲率が先端縁部１１の外周面の曲率と一致している。このため、傾斜面部２４ａの上記仮想平面上の表面位置ｓ′と先端縁部１１の外周側の角部１１ｐとの間において、円周方向の全体のいずれにおいても上記隙間ｇが生じ難くなる。このため、先端縁部１１の外周側の角部１１ｐは、傾斜面部２４ａ１′の上記領域において、上記仮想平面上の全範囲ｔａにわたり線接触した状態若しくはこれに近い状態となる。このようになると、上述のような結合作業の初期段階に偏心位置への挿入や傾斜姿勢での挿入が生じても、傾斜面部２４ａ１′の曲率が大きいことにより、差し口１０ａの角部１１ｐの接触位置が円周方向の端部以外の箇所にも均等に生じやすくなる。このことから、係合爪２４′の受ける力は円周方向に偏りにくくなり、半径方向外側へ向き易くなるため、係合爪２４′の爪座２６の開口２６ａに対する出没動作の円滑性が維持され易い。   On the other hand, in the present embodiment, as shown in FIG. 6B, the curvature on the imaginary plane is equal to the curvature of the outer peripheral surface of the distal end portion 11 in the region of the inclined surface portion 24a1 'of the inner peripheral surface 24a'. I do. For this reason, between the surface position s' on the imaginary plane of the inclined surface portion 24a and the corner 11p on the outer peripheral side of the tip edge portion 11, the gap g hardly occurs in any of the circumferential direction. For this reason, the corner 11p on the outer peripheral side of the leading edge 11 is in a state of being in line contact with or near to the entire range ta on the imaginary plane in the above region of the inclined surface 24a1 '. In this case, even if the insertion to the eccentric position or the insertion in the inclined posture occurs at the initial stage of the joining operation as described above, the curvature of the inclined surface portion 24a1 'is large. The contact position is likely to occur equally at locations other than the circumferential end. From this, the force received by the engaging claw 24 'is less likely to be deviated in the circumferential direction, and it becomes easier to face radially outward, so that the smoothness of the movement of the engaging claw 24' with respect to the opening 26a of the claw seat 26 is maintained. It is easy to be done.

一般的には、結合作業の初期段階で角部１１ｐが最初に当接する係合爪２４′の傾斜面部２４ａ１′の上記領域では、軸線と直交する仮想平面上の曲率が、小径側部分１２ａの曲率よりも小さく、しかも、小径側部分１２ａよりも大径側部分１１ａの曲率に近い。或いはまた、上記領域では、軸線と直交する仮想平面上の曲率が、内周縁部の少なくとも主体部分２４ａ２′の曲率より小さい。このため、先端縁部１１の角部１１ｐと係合爪２４′との接触状態は点接触状態というよりも線接触状態に近くなり、係合爪２４′が角部１１ｐから受ける円周方向の力成分は従来構造よりも小さく、その分、半径方向の力成分が大きくなる。したがって、係合爪２４′は従来構造よりも爪座２６の開口２６ａ内に没し易くなるため、結合作業の初期段階において差し口１０ａはスムーズに受け口２０ａ内に挿入可能となる。   Generally, in the above-mentioned region of the inclined surface portion 24a1 'of the engaging claw 24' with which the corner portion 11p first abuts at the initial stage of the joining operation, the curvature on the imaginary plane orthogonal to the axis is smaller than that of the small diameter portion 12a. The curvature is smaller than the curvature and is closer to the curvature of the large diameter side portion 11a than the small diameter side portion 12a. Alternatively, in the region, the curvature on the imaginary plane orthogonal to the axis is smaller than the curvature of at least the main portion 24a2 'of the inner peripheral edge. For this reason, the contact state between the corner 11p of the tip edge 11 and the engagement claw 24 'is closer to a line contact than the point contact state, and the engagement claw 24' receives circumferentially from the corner 11p. The force component is smaller than that of the conventional structure, and the radial force component increases accordingly. Therefore, since the engaging claws 24 'are easier to sink in the opening 26a of the claw seat 26 than in the conventional structure, the insertion port 10a can be smoothly inserted into the receptacle 20a at the initial stage of the connecting operation.

また、上記のように差し口１０ａが受け口２０ａの内部に挿入されていくに従って、差し口１０ａの先端縁部１１の外周側の角部１１ｐが係合爪２４′の傾斜面部２４ａ１′によってガイドされ、差し口１０ａの偏心位置や傾斜姿勢が修正されていく。このとき、従来構造では前述のように各係合爪２４の円周方向の左右の稜線部のみが点状の接触部ｔｅで接触するためにガイド機能が制限される。これに対して、本実施形態では、係合爪２４′の傾斜面部２４ａ１′の大きな曲率により、円周方向の全範囲にわたって角部１１ｐに対するガイド機能を発揮することが可能である。このため、結合作業の初期段階において差し口１０ａを受け口２０ａに対する結合可能な位置及び角度に円滑に修正していくことができる。したがって、突き当りによる挿入不可状態や抜き差し不能状態の発生が防止されるだけでなく、結合作業時の初期段階から中間段階へ移行するときのスムーズな装着感を得ることができる。   Further, as the insertion slot 10a is inserted into the inside of the reception port 20a as described above, the corner 11p on the outer peripheral side of the tip edge 11 of the insertion slot 10a is guided by the inclined surface 24a1 'of the engaging claw 24'. The eccentric position and the inclined attitude of the insertion port 10a are corrected. At this time, in the conventional structure, as described above, only the left and right ridge line portions in the circumferential direction of each engaging claw 24 contact at the point-like contact portion te, so that the guide function is limited. On the other hand, in the present embodiment, the large curvature of the inclined surface portion 24a1 'of the engagement claw 24' enables the guide function to the corner portion 11p to be exhibited over the entire range in the circumferential direction. For this reason, in the initial stage of the joining operation, the insertion port 10a can be smoothly corrected to the connectable position and angle with respect to the receiving port 20a. Therefore, not only the occurrence of the insertion impossible state and the removal impossible state due to the butt contact can be prevented, and a smooth wearing feeling when transitioning from the initial stage to the intermediate stage at the joining operation can be obtained.

ここで、上記領域における上記仮想平面上の曲率が大径側部分１１ａの曲率より大きい場合には、後述する稜線部Ｊ２と同様に、上記稜線部Ｊ１の丸め形状の半径や面取り形状の幅を大きくすることが好ましい。これにより、係合爪２４′の先端縁部１１の外周側の角部１１ｐ上の半径方向の高さを僅かでは或るものの低くすることができ、隙間ｇを小さくすることができる。このため、初期段階における係合爪２４′の半径方向のストローク余裕を若干増大させることができることから、偏心位置や傾斜姿勢に起因する噛み込みなどの結合不良の発生も抑制できる。また、初期段階における結合作業時の挿入抵抗を軽減することも可能である。   Here, when the curvature on the virtual plane in the region is larger than the curvature of the large diameter side portion 11a, the radius of the rounded shape and the width of the chamfered shape of the ridge portion J1 are the same as the ridge portion J2 described later. It is preferable to make it large. As a result, the radial height of the corner 11p on the outer peripheral side of the distal end edge portion 11 of the engagement claw 24 'can be slightly reduced, and the gap g can be reduced. For this reason, since it is possible to slightly increase the stroke allowance in the radial direction of the engaging claws 24 'in the initial stage, it is possible to suppress the occurrence of coupling failure such as biting due to the eccentric position or the inclined posture. Moreover, it is also possible to reduce the insertion resistance at the time of joining operation in the initial stage.

なお、本実施形態に限らず、本発明では、上記領域における上記仮想平面上の曲率は、上記小径側部分１２ａの曲率よりも大径側部分１１ａの曲率に近い曲率以下であればよく、また、内周縁部の少なくとも主体部分２４ａ２′の曲率より小さい曲率であればよい。このとき、上記領域における上記仮想平面上の曲率は、上記大径側部分１１ａの曲率よりもさらに小さい曲率（さらに大きい曲率半径Ｒｂを有する曲率）であってもよい。この場合には、図６（ｂ）に二点鎖線で示すように、傾斜面部２４ａ１′の上記仮想平面上の表面位置ｓ″の曲率が先端縁部１１の外周側の角部１１ｐの曲率よりも小さい。このため、角部１１ｐは係合爪２４′の傾斜面部２４ａ１′の上記領域の左右の端縁部分には接触しにくくなり、上記領域の中央部分に接触しやすくなる。したがって、係合爪２４′が受ける円周方向の力成分はさらに小さくなり、半径方向の力成分がさらに多くなるため、係合爪２４′の出没動作に障害が生ずることはさらに抑制される。   In the present invention, the curvature on the virtual plane in the above-described region is not limited to the present embodiment, and may be equal to or less than the curvature of the large diameter portion 11a than the curvature of the small diameter portion 12a. The curvature may be smaller than the curvature of at least the main portion 24a2 'of the inner peripheral edge portion. At this time, the curvature on the virtual plane in the region may be a curvature smaller than the curvature of the large diameter side portion 11a (a curvature having a larger curvature radius Rb). In this case, as indicated by a two-dot chain line in FIG. 6B, the curvature of the surface position s ′ ′ on the virtual plane of the inclined surface 24a1 ′ is greater than the curvature of the corner 11p on the outer peripheral side of the leading edge 11 As a result, the corner 11p is less likely to contact the left and right edge portions of the area of the inclined surface 24a1 'of the engaging claw 24', and more likely to contact the central area of the area. The circumferential force component received by the joint claw 24 'is further reduced, and the radial force component is further increased, thereby further suppressing the occurrence of the failure of the engagement claw 24'.

上記の初期段階において差し口１０ａの受け口２０ａに対する偏心位置や傾斜姿勢が或る程度修正された状態で、さらに差し口１０ａが受け口２０ａ内に挿入される。すると、図４に示すように、係合爪２４′の内周縁部２４ａ２′，２４ａ３′が先端縁部１１の外周面（すなわち、大径側部分１１ａ）上に乗り上げた状態となる（中間段階）。この状態では、図７に示すように、従来構造と本実施形態のいずれも、曲率の大きい内周縁部（の少なくとも主体部分２４ａ２，２４ａ２′）が曲率の小さな先端縁部１１の外周面上に配置される。このことにより、内周縁部のうち左右の稜線部Ｊ２のみが先端縁部１１の外周面上に接触部ｔｆ、ｔｇで接触した状態となる。   The outlet 10a is further inserted into the outlet 20a in a state where the eccentric position and the inclined posture of the outlet 10a with respect to the outlet 20a have been corrected to some extent in the above initial stage. Then, as shown in FIG. 4, the inner peripheral edge portions 24a2 'and 24a3' of the engaging claws 24 'are in a state of riding on the outer peripheral surface (that is, the large diameter side portion 11a) of the distal end edge 11 (intermediate stage ). In this state, as shown in FIG. 7, in both the conventional structure and the present embodiment, the inner peripheral edge (at least the main portions 24 a 2 and 24 a 2 ′) with large curvature is on the outer peripheral surface of the tip edge 11 with small curvature. Be placed. As a result, only the left and right ridge portions J2 of the inner peripheral edge portion are in contact with the outer peripheral surface of the tip end edge portion 11 at the contact portions tf and tg.

このとき、本実施形態では、内周縁部２４ａ２′のように左右の稜線部Ｊ２の丸め形状の半径や面取り形状の幅を大きくしてもよい（図７及び図８参照）。これにより、稜線部Ｊ２と先端縁部１１の外周面との間の接触部ｔｇの変化により、係合爪２４′の先端縁部１１の外周面上の半径方向の高さを僅かでは或るものの低くすることができ、間隙ｇ′を小さくすることができる。このため、中間段階における係合爪２４′の半径方向のストローク余裕を若干増大させることができることから、傾斜姿勢に起因する噛み込みなどの結合不良の発生も抑制できる。また、中間段階における結合作業時の挿入抵抗を軽減することも可能である。さらに、図１に示すように、上記稜線部Ｊ２の内側の左右の端縁部２４ａ３′の曲率を局所的に小さくしてもよい。すなわち、前述のように、内周縁部に主体部分２４ａ２′の曲率よりも小さい曲率を備えた上記両端部２４ａ３′を設けることにより、接触部が図示のｔｇ′のように広がり、左右の稜線部Ｊ２及びその近傍の先端縁部１１の外周面に対する接触状態を線接触状態から面接触状態とすることができる。このため、上記の効果に加えて、係合爪２４′と差し口１０ａの外周面の損傷を低減し、耐久性を向上させることができる。   At this time, in the present embodiment, the radius of the rounded shape and the width of the chamfered shape of the left and right ridge portions J2 may be increased as in the inner peripheral edge portion 24a2 '(see FIGS. 7 and 8). Thereby, due to the change of the contact portion tg between the ridge line portion J2 and the outer peripheral surface of the distal end edge 11, the radial height on the outer peripheral surface of the distal end edge 11 of the engaging claw 24 'is slightly small. However, the gap g 'can be reduced. For this reason, since it is possible to slightly increase the stroke allowance in the radial direction of the engaging claws 24 'in the intermediate stage, it is possible to suppress the occurrence of coupling failure such as biting due to the inclined posture. Moreover, it is also possible to reduce the insertion resistance at the time of the joining operation in the middle stage. Furthermore, as shown in FIG. 1, the curvature of the left and right end 24 a 3 ′ on the inner side of the ridge line portion J 2 may be locally reduced. That is, as described above, by providing the both end portions 24a3 'having the curvature smaller than the curvature of the main portion 24a2' in the inner peripheral edge portion, the contact portion spreads as shown in tg ', and the left and right ridge portions The state of contact with J2 and the outer peripheral surface of the tip end edge 11 in the vicinity thereof can be changed from line contact to surface contact. Therefore, in addition to the above-described effects, damage to the outer peripheral surfaces of the engaging claws 24 'and the insertion port 10a can be reduced, and the durability can be improved.

最後に、上記中間段階よりもさらに差し口１０ａを受け口２０ａ内に挿入すると、先端縁部１１が係合爪２４′の内周縁部２４ａ２′，２４ａ３′よりも奥側に移動することにより、内周縁部２４ａ２′，２４ａ３′が外周段差１２の小径側部分１２ａに対面することとなる。これにより、係合爪２４′はばね部材２５の弾性力によって突出するので、係合爪２４′の係合面２４ｂ′が外周段差１２に係合し、結合状態となる（完了段階）。   Finally, when the insertion port 10a is inserted into the reception port 20a further than the above-mentioned intermediate stage, the tip end edge 11 moves to the back side relative to the inner peripheral edge portions 24a2 'and 24a3' of the engaging claws 24 '. The peripheral edge portions 24 a 2 ′ and 24 a 3 ′ will face the small diameter side portion 12 a of the outer peripheral step 12. As a result, since the engaging claws 24 'are protruded by the elastic force of the spring member 25, the engaging surfaces 24b' of the engaging claws 24 'are engaged with the outer circumferential step 12 to be in a coupled state (completion stage).

上述のように、本実施形態では、係合爪２４′の内周面２４ａ′の傾斜面部２４ａ１′の所定領域の曲率が従来の曲率よりも小さい（すなわち、曲率半径ＲａがＤ／２＝３２．２５ｍｍ（呼び径６５ｍｍの場合）よりも大きい）。これにより、結合作業の初期段階において係合爪２４′の受ける力が円周方向に加わり難くすることができる。このため、係合爪２４′が爪座２６の開口２６ａに引っかかり動作不能になるなどを事態の発生を回避でき、係合爪２４′を円滑に出没動作させることができる。また、結合作業の初期段階において差し口１０ａの外周側の角部１１ｐと係合爪２４′の傾斜面部２４ａ１′とが従来構造の点接触状態よりも線接触状態に近くなる。このため、係合爪２４′による差し口１０ａに対するガイド機能が高められ、その結果、受け口２０ａに対する差し口１０ａの偏心位置や傾斜姿勢の修正が円滑に行われる。このため、結合作業時においてスムーズでひっかかりのない良好な装着感を得ることができる。したがって、差込式結合継手の結合作業時の挿入不良が抑制され、結合作業を円滑に行うことが可能になる。また、差し口１０ａの先端縁部１１の外周側の角部１１ｐと、係合爪２４′の傾斜面部２４ａ１′との整合性が向上して線接触状態に近づくことから、結合作業の初期において係合爪２４′と先端縁部１１に加わる衝撃を軽減できる。このため、係合爪２４′や差し口１０ａの損傷の低減や耐久性の向上を図ることができる。   As described above, in the present embodiment, the curvature of the predetermined region of the inclined surface portion 24a1 'of the inner peripheral surface 24a' of the engagement claw 24 'is smaller than the conventional curvature (that is, the curvature radius Ra is D / 2 = 32). Larger than 25 mm (in case of nominal diameter 65 mm)). Thereby, it is possible to make it difficult for the force received by the engagement claws 24 'to be applied circumferentially in the initial stage of the joining operation. Therefore, the occurrence of a situation where the engaging claw 24 'is caught by the opening 26a of the claw seat 26 and the like can be avoided, and the engaging claw 24' can be made to smoothly move in and out. Further, at the initial stage of the joining operation, the corner 11p on the outer peripheral side of the insertion port 10a and the inclined surface 24a1 'of the engaging claw 24' become closer to line contact than the point contact of the conventional structure. For this reason, the guide function with respect to the insertion port 10a by the engagement claw 24 'is enhanced, and as a result, correction of the eccentric position and the inclined posture of the insertion port 10a with respect to the receptacle 20a is smoothly performed. For this reason, it is possible to obtain a smooth wearing feeling and a good wearing feeling during the joining operation. Therefore, the insertion defect at the time of the joint operation of the plug-in joint can be suppressed, and the joint operation can be smoothly performed. In addition, since the alignment between the corner 11p on the outer peripheral side of the tip edge 11 of the insertion slot 10a and the inclined surface 24a1 'of the engaging claw 24' is improved and approaches a line contact state, at the beginning of the joining operation The impact applied to the engaging claws 24 ′ and the tip end edge 11 can be reduced. For this reason, it is possible to reduce the damage to the engagement claw 24 'and the insertion port 10a and to improve the durability.

なお、本発明の差込式結合継手は、上記実施形態に記載の構成に限定されるものではなく、本発明の趣旨に基づく種々の異なる態様を含む。たとえば、上記実施形態では、ＪＩＳに規定される消防用結合金具を構成する例を示したが、本発明はこれに限定されるものではない。例えば、上述のように結合動作を行うことができる差し口と係合爪とを備えた継手であれば、いかなる用途に用いられるものにも適用可能である。また、ＪＩＳに規定される寸法に何ら限定されるものではない。さらに、係合爪の具体的な構造も、上記の図示例に限定されるものではなく、傾斜面部と内周縁部を備えた内周面と外周段差に係合可能な係合面を有するものであればよい。さらに、上記実施形態において、内周縁部を従来構造と同様に中央から左右の稜線部Ｊ２に至る全範囲においてほぼ一定の曲率に形成してもよい。   In addition, the plug-in type coupling joint of this invention is not limited to the structure as described in the said embodiment, The various different aspect based on the meaning of this invention is included. For example, although the example which comprises the connection fitting for fire fighting prescribed | regulated to JIS was shown in the said embodiment, this invention is not limited to this. For example, as long as it is a joint provided with a socket and an engaging claw capable of performing a joint operation as described above, it is applicable to any joint used for any application. Further, the dimensions are not limited to those specified in JIS. Furthermore, the specific structure of the engagement claw is not limited to the above illustrated example, and has an inner peripheral surface provided with a sloped surface portion and an inner peripheral edge portion and an engagement surface engageable with the outer peripheral step. If it is Furthermore, in the above embodiment, the inner peripheral edge portion may be formed to have a substantially constant curvature over the entire range from the center to the left and right ridge portions J2 as in the conventional structure.

１…差込式結合継手、１０…差し具、１０ａ…差し口、１１…先端縁部、１１ｐ…外周側の角部、１１ａ…大径側部分、１２…外周段差、１２ａ…小径側部分、１３…接続部、１４…解除部材、１４ａ…筒体部、１４ｂ…フランジ部、２０′…受け具、２０ａ…受け口、２１…先端縁部、２２…受け具本体、２２ａ…接続部、２２ｂ…取付枠部、２３…締め輪、２３ａ…取付座、２４′…係合爪、２４ａ′…内周面、２４ａ１′…傾斜面部、ｏ…外縁、ｏ′…外側境界、i…内縁、ｉ′…内側境界、２４ａ２′…内周縁部の主体部分、２４ａ３′…内周縁部の両端部、２４ｂ′…係合面、２４ｃ′…側面、２４ｄ′…基台部、Ｂａ…内周壁、Ｂｂ…係合壁、Ｂｃ…側面壁、Ｃａ〜Ｃｃ…補強リブ構造、２５…ばね部材、２６…爪座、２６ａ…開口、２７…保護部材 DESCRIPTION OF SYMBOLS 1 ... Plug-in type coupling joint, 10 ... Insertion tool, 10a ... Insertion port, 11 ... Tip edge part, 11p ... Corner part of outer peripheral side, 11a ... Large diameter side part, 12 ... Outer peripheral level difference, 12a ... Small diameter side part, DESCRIPTION OF SYMBOLS 13 ... Connection part, 14 ... Release member, 14a ... Tubular part, 14b ... Flange part, 20 '... Receiving tool, 20a ... Receiving port, 21 ... Tip edge part, 22 ... Receiving tool main body, 22a ... Connection part, 22b ... Mounting frame portion 23 Clamping ring 23a Mounting seat 24 'Engaging claw 24a' Inner circumferential surface 24a1 'Sloped surface portion o Outer edge o' Outer boundary i 'Inner edge i' ... Inner boundary, 24a2 '... Main portion of inner peripheral edge, 24a 3' ... Both ends of inner peripheral edge, 24b '... Engagement surface, 24c' ... Side surface, 24d '... Base portion, Ba ... Inner circumferential wall, Bb ... Engaging wall, Bc: Side wall, Ca to Cc: Reinforcing rib structure, 25: Spring member, 26: Nail seat, 26a: Open Mouth, 27 ... protection member

Claims (12)

先端側に傾斜面部を備えた円弧形状の内周面を有する係合爪が受け口の内部において出没可能かつ内周側へ突出するように付勢された状態に設けられた受け具と、差し口の外周において円筒面状の外周面を備えた先端縁部及び前記先端縁部の基端側に前記係合爪と係合可能な外周段差が設けられた差し具と、を具備し、前記差し口が前記受け口に差し込まれたときに前記係合爪と前記外周段差との係合により結合可能に構成される結合継手であって、
前記傾斜面部は、結合作業の初期において前記先端縁部の外周側の角部が最初に接触する位置を含む領域であって、前記受け口の軸線と直交する仮想平面上において、前記外周段差の小径側部分の曲率よりも小さく、かつ、前記小径側部分よりも前記外周段差の大径側部分の曲率に近い曲率を備える前記領域を有することを特徴とする差込式結合継手。 A receptacle provided in a state in which an engagement claw having an arc-shaped inner peripheral surface provided with a sloped surface portion on the tip end side is capable of projecting and retracting in the interior of the receptacle and biased toward the inner peripheral side; A distal end edge having a cylindrical outer circumferential surface on the outer periphery of the outer edge, and a plug provided with an outer circumferential step engageable with the engagement claw on the base end side of the distal end edge portion; A coupling joint configured to be coupleable by the engagement of the engagement claw and the outer peripheral step when a mouth is inserted into the receptacle.
The inclined surface portion is a region including a position at which the corner portion on the outer peripheral side of the tip end edge first contacts in the initial stage of the bonding operation, and the small diameter of the outer peripheral step on an imaginary plane orthogonal to the axis of the receiving port. A plug-in joint having the region having a curvature smaller than the curvature of the side portion and closer to the curvature of the large diameter side portion of the outer peripheral step than the small diameter side portion. 前記領域の前記仮想平面上の曲率は、前記大径側部分の曲率以下であることを特徴とする請求項１に記載の差込式結合継手。   The plug-in joint according to claim 1, wherein the curvature of the region on the imaginary plane is equal to or less than the curvature of the large diameter side portion. 前記領域の前記仮想平面上の曲率は、前記大径側部分の曲率と一致することを特徴とする請求項２に記載の差込式結合継手。   3. The plug-in joint according to claim 2, wherein the curvature of the region on the imaginary plane coincides with the curvature of the large diameter portion. 前記内周面には、前記傾斜面部の内縁に隣接する内周縁部が設けられ、
前記領域は、前記傾斜面部の外縁から、或いは、前記受け具の非結合時において前記係合爪が突出状態にあるときに前記先端縁部の外周側の角部に対応する半径方向の位置にある前記傾斜面部の表面部位と前記外縁との間にある外側境界から、前記表面部位と前記内縁との間にある内側境界までの範囲を有し、
前記傾斜面部は、前記内側境界から前記内縁までの範囲では、前記内周縁部のうちの前記傾斜面部と異なる曲率を備える少なくとも主体部分に向けて、前記仮想平面上の曲率が前記領域の曲率から前記内周縁部の曲率まで漸次変化することを特徴とする請求項１〜３のいずれか一項に記載の差込式結合継手。 The inner peripheral surface is provided with an inner peripheral edge adjacent to the inner edge of the inclined surface,
The region is at a radial position corresponding to an outer edge of the inclined surface portion or a corner on the outer peripheral side of the tip edge when the engagement claw is in a projecting state when the receiving tool is not coupled. It has a range from an outer boundary between a surface portion of the inclined surface portion and the outer edge to an inner boundary between the surface portion and the inner edge,
In the range from the inner boundary to the inner edge, the inclined surface portion is directed to at least a main portion of the inner peripheral portion having a curvature different from that of the inclined surface portion, and the curvature on the virtual plane is the curvature of the region The plug-in joint according to any one of claims 1 to 3, wherein the curvature gradually changes to the curvature of the inner peripheral edge portion. 前記内周面には、前記傾斜面部の基端側に隣接し前記軸線と平行な円弧状の内周縁部が設けられ、前記内周縁部は、左右の両端部を除く少なくとも主体部分において、前記大径側部分の曲率よりも大きく、かつ、前記小径側部分の曲率以下の曲率を備えることを特徴とする請求項１〜３のいずれか一項に記載の差込式結合継手。   The inner peripheral surface is provided with an arc-shaped inner peripheral edge adjacent to the base end side of the inclined surface and parallel to the axis, the inner peripheral edge being at least the main portion excluding both left and right end portions. The plug-in joint according to any one of claims 1 to 3, characterized in that it has a curvature that is greater than the curvature of the large diameter side portion and less than or equal to the curvature of the small diameter side portion. 先端側に傾斜面部を備えるとともに前記傾斜面部の基端側に隣接する内周縁部を備えた円弧形状の内周面を有する係合爪が受け口の内部において出没可能かつ内周側へ突出するように付勢された状態に設けられた受け具と、差し口の外周において円筒面状の外周面を備えた先端縁部及び前記先端縁部の基端側に前記係合爪と係合可能な外周段差が設けられた差し具と、を具備し、前記差し口が前記受け口に差し込まれたときに前記係合爪と前記外周段差との係合により結合可能に構成される結合継手であって、
前記内周縁部は、左右の両端部を除く少なくとも主体部分において、前記外周段差の大径側部分の曲率よりも大きく、かつ、前記外周段差の小径側部分の曲率以下の曲率を備え、
前記傾斜面部は、結合作業の初期において前記先端縁部の外周側の角部が最初に接触する位置を含む領域であって、前記受け口の軸線と直交する仮想平面上において、前記内周縁部の少なくとも前記主体部分の前記曲率よりも小さい曲率を備える前記領域を有することを特徴とする差込式結合継手。 An engaging claw having an arc-shaped inner peripheral surface provided with an inclined surface portion on the distal end side and an inner peripheral edge adjacent to the base end side of the inclined surface portion is capable of projecting and retracting to the inner peripheral side inside the receptacle And a tip end portion provided with a cylindrical outer peripheral surface on the outer periphery of the insertion port, and the proximal end side of the tip end portion can be engaged with the engagement claw. A joint provided with a plug provided with an outer peripheral step, wherein the coupling claw is configured to be connectable by the engagement of the engaging claw and the outer peripheral step when the insertion port is inserted into the receptacle. ,
The inner peripheral edge portion has a curvature larger than the curvature of the large diameter side portion of the outer peripheral step and smaller than or equal to the curvature of the small diameter side portion of the outer peripheral step in at least the main part excluding both left and right ends.
The inclined surface portion is a region including a position at which an outer peripheral corner of the tip end edge first contacts in the initial stage of the bonding operation, and on the imaginary plane orthogonal to the axis of the receptacle, the inclined surface portion A plug-in joint comprising: said area with a curvature smaller than at least said curvature of said main part. 前記領域の前記仮想平面上の曲率は、前記内周縁部の少なくとも前記主体部分の前記曲率よりも前記大径側部分の曲率に近いことを特徴とする請求項６に記載の差込式結合継手。   The plug-in joint according to claim 6, wherein the curvature of the region on the virtual plane is closer to the curvature of the large diameter side portion than the curvature of at least the main portion of the inner peripheral edge portion. . 前記領域は、前記傾斜面部の外縁から、或いは、前記受け具の非結合時において前記係合爪が突出状態にあるときに前記先端縁部の外周側の角部に対応する半径方向の位置にある前記傾斜面部の表面部位と前記外縁との間にある外側境界から、前記表面部位と前記内縁との間にある内側境界までの範囲を有し、
前記傾斜面部は、前記内側境界から前記内縁までの範囲では、前記内周縁部のうちの少なくとも前記主体部分に向けて、前記仮想平面上の曲率が前記領域の曲率から前記内周縁部の曲率まで漸次変化することを特徴とする請求項６又は７に記載の差込式結合継手。 The region is at a radial position corresponding to an outer edge of the inclined surface portion or a corner on the outer peripheral side of the tip edge when the engagement claw is in a projecting state when the receiving tool is not coupled. It has a range from an outer boundary between a surface portion of the inclined surface portion and the outer edge to an inner boundary between the surface portion and the inner edge,
In the range from the inner boundary to the inner edge, the inclined surface portion is directed from the curvature of the region to the curvature of the inner peripheral portion toward at least the main portion of the inner peripheral portion in the range from the inner boundary to the inner edge A plug-in joint according to claim 6 or 7, characterized in that it gradually changes. 前記内周縁部には、前記主体部分の曲率よりも前記大径側部分の曲率に近い曲率を備える左右の両端部が設けられることを特徴とする請求項４〜８のいずれか一項に記載の差込式結合継手。   The left and right end portions having a curvature closer to the curvature of the large diameter side portion than the curvature of the main portion are provided at the inner peripheral edge portion, according to any one of claims 4 to 8. Plug-in coupling joint. 前記係合爪は、型成形された焼結材、鍛造材、又は、鋳造材により構成されることを特徴とする請求項１〜９のいずれか一項に記載の差込式結合継手。   10. The plug-in joint according to any one of claims 1 to 9, wherein the engagement claw is formed of a molded sintered material, a forged material, or a cast material. 前記内周面を構成する内周壁、前記外周段差と係合する係合面を構成する係合壁、並びに、前記内周面及び前記係合面と交差する円周方向両側の側面をそれぞれ構成する側面壁を一体に備えた箱型構造を備えることを特徴とする請求項１０に記載の差込式結合継手。   An inner circumferential wall constituting the inner circumferential surface, an engagement wall constituting an engagement surface engaging with the outer circumferential step, and side surfaces on both sides in the circumferential direction intersecting the inner circumferential surface and the engagement surface 11. A plug-in joint according to claim 10, characterized in that it comprises a box-type structure integrally provided with side walls. 前記内周壁の裏側には、前記箱型構造の内部において、前記内周壁及び前記係合壁と一体に接合された補強リブ構造が設けられることを特徴とする請求項１１に記載の差込式結合継手。   The plug-in type according to claim 11, wherein a reinforcing rib structure integrally joined with the inner peripheral wall and the engagement wall is provided on the back side of the inner peripheral wall inside the box-shaped structure. Coupling joint.
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