JP2013164107A

JP2013164107A - Separation preventive device

Info

Publication number: JP2013164107A
Application number: JP2012026714A
Authority: JP
Inventors: Hiroyuki Machida; 浩之町田
Original assignee: Cosmo Koki Co Ltd
Current assignee: Cosmo Koki Co Ltd
Priority date: 2012-02-09
Filing date: 2012-02-09
Publication date: 2013-08-22

Abstract

PROBLEM TO BE SOLVED: To provide a separation preventive device capable of surely preventing a fluid pipe from being separated, and capable of exerting a force for preventing a fluid pipe from being separated in various directions, while preventing its outer surface from being corroded and its inner surface from being damaged.SOLUTION: A separation preventive device 3 of a fluid pipe includes: a separation prevention body 5 that is outwardly fitted to an outer circumferential surface of a fluid pipe 1 and includes recesses 4 extending in the circumferential direction on the inner peripheral surface; a plurality of arched claws 6 accommodated respectively within the recesses 4 at the tip end of the inner circumferential surface side, and having blade parts 6b capable of biting into the outer circumferential surface of the fluid pipe 1; and pressing means 7 that presses the outer circumferential end 6c of the arched claw 6 so that the blade part 6b bites into the outer circumferential surface of the fluid pipe 1. The blade part 6b includes a first blade part 61 that extends in the circumferential direction of the fluid pipe 1 and in the pipe axial direction and is formed in an approximately spiral shape, and a second blade part 62 that extends in a direction different from that of the first blade part 61 and is also formed in an approximately spiral shape. The first blade part 61 and the second blade part 62 are alternately disposed in the circumferential direction of the fluid pipe 1.

Description

本発明は、凹部を有する離脱防止本体の前記凹部内にそれぞれ収容され、内周側の先端部に流体管の外周面に食込み可能な刃部を有する複数の弓形爪と、該弓形爪の外周端を押圧することにより、前記刃部を流体管の外周面に食込ませる押圧手段と、を備える流体管の離脱防止装置に関する。 The present invention provides a plurality of arcuate claws that are respectively housed in the recesses of a detachment prevention main body having a recess and have a blade portion that can bite into the outer peripheral surface of the fluid pipe at the inner peripheral tip, and the outer periphery of the bow The present invention relates to a fluid pipe detachment prevention device comprising: pressing means for biting the blade portion into the outer peripheral surface of a fluid pipe by pressing an end.

従来の離脱防止装置は、係止片（弓形爪）の底面に一対の離脱防止用爪が管周方向に形成され、回転防止用爪が管軸方向に形成されている。この離脱防止用爪と回転防止用爪とは、それぞれ係止片の底面において直線的に形成されており、押しボルト（押圧手段）の押付力を受けて流体管の外周面に食い込むことで、流体管が離脱することが防がれている（例えば、特許文献１参照）。 In a conventional detachment prevention device, a pair of detachment prevention claws are formed in the pipe circumferential direction on the bottom surface of the locking piece (bow-shaped claw), and a rotation prevention claw is formed in the tube axis direction. The separation preventing claw and the rotation preventing claw are each formed linearly on the bottom surface of the locking piece, and by biting into the outer peripheral surface of the fluid pipe by receiving the pressing force of the pressing bolt (pressing means), The fluid pipe is prevented from coming off (see, for example, Patent Document 1).

特許３４１１３８２号公報（第３頁、第３図）Japanese Patent No. 3411382 (page 3, FIG. 3)

しかしながら、特許文献１にあっては、離脱防止用爪と回転防止用爪とは、それぞれ係止片の底面視で直線的に形成されていることから、流体管に対して偏った方向へ外力が加わった場合に、離脱防止用爪及び回転防止用爪が流体管の外面の局所に片当たりし、流体管の一断面に応力が集中し、局所が損傷してしまうという問題がある。 However, in Patent Document 1, since the separation preventing claw and the rotation preventing claw are each formed linearly in the bottom view of the locking piece, an external force is applied in a direction biased with respect to the fluid pipe. Is applied, the claw for preventing separation and the claw for preventing rotation come into contact with the local area of the outer surface of the fluid pipe, and there is a problem that stress is concentrated on one section of the fluid pipe and the local area is damaged.

本発明は、このような問題点に着目してなされたもので、流体管の離脱防止力を多岐の方向に発揮することができるとともに、流体管外面を防食及び内面の損傷を防止しながら、確実に流体管の離脱を防止する離脱防止装置を提供することを目的とする。 The present invention has been made paying attention to such problems, while being able to demonstrate the separation prevention force of the fluid pipe in various directions, while preventing corrosion of the fluid pipe outer surface and damage to the inner surface, It is an object of the present invention to provide a detachment prevention device that reliably prevents detachment of a fluid pipe.

前記課題を解決するために、本発明の離脱防止装置は、
流体管の外周面に外嵌され、かつ内周面に円周方向に延びる凹部を有する離脱防止本体と、前記凹部内にそれぞれ収容され、内周側の先端部に流体管の外周面に食込み可能な刃部を有する複数の弓形爪と、該弓形爪の外周端を押圧することにより、前記刃部を流体管の外周面に食込ませる押圧手段と、を備える流体管の離脱防止装置において、
前記刃部は、流体管の周方向に延びるとともに管軸方向に延びる略螺旋状に形成された第１刃部、及び該第１刃部と異なる方向に延びる略螺旋状に形成された第２刃部からなり、該第１刃部及び該第２刃部が流体管の周方向に交互に配置されることを特徴としている。
この特徴によれば、第１刃部及び第２刃部は略螺旋状に形成されており、更に第１刃部と第２刃部とが異なる方向に延びているので、流体管の離脱防止力を離脱方向や回転方向等の多方向に発揮することができ、且つ、第１刃部及び第２刃部の係止力が流体管の一断面に集中せず管軸方向に分散するため、係止力集中による損傷などの影響が流体管内面に生じ難く、流体管の局所損傷を回避できる。また、第１刃部と第２刃部とが流体管の周方向に交互に配置されることで、流体管の離脱防止力が一方向だけに偏らず平均化され、確実に流体管の離脱防止を行うことができる。 In order to solve the above-mentioned problem, the separation preventing device of the present invention is
A detachment prevention body that is fitted on the outer peripheral surface of the fluid pipe and has a concave portion extending in the circumferential direction on the inner peripheral surface, and is housed in the concave portion, and bites into the outer peripheral surface of the fluid pipe at the inner peripheral tip portion. In a fluid tube detachment prevention device, comprising: a plurality of arcuate claws having possible blade portions; and pressing means for causing the blade portions to bite into an outer peripheral surface of the fluid tube by pressing an outer peripheral end of the arcuate claws. ,
The blade portion extends in the circumferential direction of the fluid pipe and has a substantially spiral shape extending in the tube axis direction, and a second spiral shape extending in a different direction from the first blade portion. It consists of a blade portion, and the first blade portion and the second blade portion are alternately arranged in the circumferential direction of the fluid pipe.
According to this feature, the first blade portion and the second blade portion are formed in a substantially spiral shape, and further, the first blade portion and the second blade portion extend in different directions, so that the fluid pipe is prevented from being detached. The force can be exerted in multiple directions such as the separation direction and the rotation direction, and the locking force of the first blade portion and the second blade portion is not concentrated on one section of the fluid pipe but dispersed in the pipe axis direction. The influence of damage due to concentration of the locking force hardly occurs on the inner surface of the fluid pipe, and local damage to the fluid pipe can be avoided. Further, the first blade portion and the second blade portion are alternately arranged in the circumferential direction of the fluid pipe, so that the fluid pipe detachment preventing force is averaged without being biased in only one direction, and the fluid pipe is surely detached. Prevention can be performed.

本発明の離脱防止装置は、
前記第１刃部及び前記第２刃部は、前記弓形爪に対して連続して設けられていることを特徴としている。
この特徴によれば、弓形爪に対して第１刃部、及び前記第２刃部が連続して設けられることにより、弓形爪に楔が確実に形成されるため、流体管の離脱防止力を増大させることができる。 The separation preventing device of the present invention is
The first blade portion and the second blade portion are provided continuously with respect to the arcuate claw.
According to this feature, since the first blade portion and the second blade portion are continuously provided with respect to the arcuate claw, the wedge is reliably formed on the arcuate claw. Can be increased.

本発明の離脱防止装置は、
流体管の外周面に外嵌され、かつ内周面に円周方向に延びる凹部を有する離脱防止本体と、前記凹部内にそれぞれ収容され、内周側の先端部に流体管の外周面に食込み可能な刃部を有する複数の弓形爪と、該弓形爪の外周端を押圧することにより、前記刃部を流体管の外周面に食込ませる押圧手段と、を備える流体管の離脱防止装置において、
前記弓形爪は、流体管の周方向に延びるとともに管軸方向に延びる略螺旋状に形成された第１刃部を有する一方の弓形爪、及び該第１刃部と異なる方向に延びる略螺旋状に形成された第２刃部を有する他方の弓形爪からなり、該一方の弓形爪及び該他方の弓形爪が流体管の周方向に交互に配置されることを特徴としている。
この特徴によれば、第１刃部及び第２刃部は略螺旋状に形成されており、更に第１刃部と第２刃部とが異なる方向に延びているので、流体管の離脱防止力を離脱方向や回転方向等の多方向に発揮することができ、且つ、刃部の係止力が流体管の一断面に集中せず管軸方向に分散するため、係止力集中による損傷などの影響が流体管内面に生じ難く、流体管の局所損傷を回避できる。また、流体管の離脱防止力が一方向だけに偏らず平均化され、確実に流体管の離脱防止を行うことができるとともに、一つの弓形爪に１種類の刃部を設ければよく、弓形爪の製造が容易である。 The separation preventing device of the present invention is
A detachment prevention body that is fitted on the outer peripheral surface of the fluid pipe and has a concave portion extending in the circumferential direction on the inner peripheral surface, and is housed in the concave portion, and bites into the outer peripheral surface of the fluid pipe at the inner peripheral tip portion. In a fluid tube detachment prevention device, comprising: a plurality of arcuate claws having possible blade portions; and pressing means for causing the blade portions to bite into an outer peripheral surface of the fluid tube by pressing an outer peripheral end of the arcuate claws. ,
The arcuate claw has one arcuate claw having a first blade portion formed in a substantially spiral shape extending in the circumferential direction of the fluid pipe and extending in the tube axis direction, and a substantially spiral shape extending in a direction different from the first blade portion. The other arcuate claw having the second blade portion formed on the first and second arcuate claws, and the one arcuate claw and the other arcuate claw are alternately arranged in the circumferential direction of the fluid pipe.
According to this feature, the first blade portion and the second blade portion are formed in a substantially spiral shape, and further, the first blade portion and the second blade portion extend in different directions, so that the fluid pipe is prevented from being detached. Because the force can be exerted in multiple directions such as the direction of separation and rotation, and the locking force of the blade is not concentrated on one section of the fluid pipe, it is distributed in the tube axis direction. Such effects are hardly generated on the inner surface of the fluid pipe, and local damage to the fluid pipe can be avoided. In addition, the fluid pipe detachment preventing force is averaged without being biased in only one direction, so that the fluid pipe can be reliably prevented from detaching, and one kind of blade portion is provided on one arcuate claw. Manufacture of nails is easy.

本発明の離脱防止装置は、
前記刃部は、流体管の管軸方向に複数条設けられていることを特徴としている。
この特徴によれば、第１刃部及び第２刃部が流体管の軸方向に多数条配置してあるので、流体管の離脱防止力が増大するばかりでなく、弓形爪が安定して配置されるとともに、第１刃部及び第２刃部が流体管の外周面に食込む際の食込み力が多数の刃部に分散されるため、流体管の外周面や内周面に形成した防食用ライニング層に割れや剥離が発生するのを抑制することができる。また、流体管が屈曲変形していても弓形爪が流体管の軸方向に複数列配置されてあるので、流体管の屈曲変形に沿って弓形爪の刃部が流体管の外周面に食込むことができ、確実に離脱防止を行うことができる。 The separation preventing device of the present invention is
A plurality of the blade portions are provided in the tube axis direction of the fluid tube.
According to this feature, since the first blade portion and the second blade portion are arranged in a number of strips in the axial direction of the fluid pipe, not only the fluid pipe detachment prevention force is increased, but also the arcuate claws are stably placed. In addition, since the biting force when the first blade portion and the second blade portion bite into the outer peripheral surface of the fluid pipe is distributed to a large number of blade portions, the prevention formed on the outer peripheral surface and inner peripheral surface of the fluid pipe It can suppress that a crack and peeling generate | occur | produce in an edible lining layer. Even if the fluid pipe is bent and deformed, the arcuate claws are arranged in a plurality of rows in the axial direction of the fluid pipe, so that the blade portion of the arcuate claw bites into the outer peripheral surface of the fluid pipe along the bending deformation of the fluid pipe. Can be reliably prevented.

本発明の離脱防止装置は、
前記弓形爪は、管軸方向に略同じ位置で周方向に沿って複数配設されることを特徴としている。
この特徴によれば、弓形爪が流体管の周方向に沿って配設されることにより、流体管の管軸方向に大きなスペースを必要とせず、弓形爪の範囲で確実に離脱防止を行うことができるため、かかる離脱防止装置をコンパクトにすることができる。 The separation preventing device of the present invention is
A plurality of the arcuate claws are arranged along the circumferential direction at substantially the same position in the tube axis direction.
According to this feature, the arcuate claw is arranged along the circumferential direction of the fluid pipe, so that a large space is not required in the pipe axis direction of the fluid pipe, and the separation is surely prevented within the range of the arcuate claw. Therefore, the separation preventing device can be made compact.

本発明の離脱防止装置は、
前記刃部の表面に防食部を有した介在部材が設けられていることを特徴としている。
この特徴によれば、弓形爪の刃部の表面が介在部材の防食部により覆われているので、刃部及び流体管の外面の腐食を防止することができ、長期に亘り離脱防止効果を維持することができる。 The separation preventing device of the present invention is
An interposition member having a corrosion prevention portion is provided on the surface of the blade portion.
According to this feature, since the surface of the blade portion of the arcuate claw is covered with the anticorrosion portion of the interposition member, it is possible to prevent corrosion of the blade portion and the outer surface of the fluid pipe, and maintain the separation preventing effect for a long period of time. can do.

本発明の離脱防止装置は、
前記介在部材は、前記弓形爪と前記凹部内との間隙に延設される弾性を有した弾性部を備えていることを特徴としている。
この特徴によれば、弓形爪が弾性部によって凹部内から落下することが防がれるとともに、弓形爪の刃部を流体管の外周面に食込ませることを補助する補助手段として用いることができる。 The separation preventing device of the present invention is
The interposition member includes an elastic part having elasticity extending in a gap between the arcuate claw and the inside of the recess.
According to this feature, the arcuate claw can be prevented from falling from the inside of the recess by the elastic portion, and can be used as auxiliary means for assisting the cutting of the blade portion of the arcuate claw into the outer peripheral surface of the fluid pipe. .

実施例１における離脱防止装置を示す側断面図である。It is a sectional side view which shows the separation prevention apparatus in Example 1. FIG. 実施例１における離脱防止装置を示す正面図である。It is a front view which shows the separation prevention apparatus in Example 1. FIG. 実施例１における離脱防止装置の要部を拡大した側断面図である。It is the sectional side view to which the principal part of the removal prevention apparatus in Example 1 was expanded. （ａ）は、実施例１における弓形爪を示す正面図であり、（ｂ）は、同じく底面図である。(A) is a front view which shows the bow-shaped nail | claw in Example 1, (b) is a bottom view similarly. （ａ）は、弓形爪の第１変形例を示す底面図であり、（ｂ）は、弓形爪の第２変形例を示す底面図であり、（ｃ）は、弓形爪の第３変形例を示す底面図であり、（ｄ）は、弓形爪の第４変形例を示す底面図である。(A) is a bottom view showing a first modification of the bow claw, (b) is a bottom view showing a second modification of the bow claw, and (c) is a third modification of the bow claw. (D) is a bottom view showing a fourth modification of the bow-shaped claw. （ａ）は、弓形爪の第５変形例を示す底面図であり、（ｂ）は、弓形爪の第６変形例を示す底面図であり、（ｃ）は、弓形爪の第７変形例を示す底面図である。(A) is a bottom view showing a fifth modification of the bow claw, (b) is a bottom view showing a sixth modification of the bow claw, and (c) is a seventh modification of the bow claw. FIG. 離脱防止本体の変形例を示す側断面図である。It is a sectional side view which shows the modification of a detachment | leave prevention main body. 離脱防止本体の別の変形例を示す側断面図である。It is a sectional side view which shows another modification of a detachment prevention main body. 離脱防止本体の更に別の変形例を示す側断面図である。It is a sectional side view which shows another modification of a detachment prevention main body. （ａ）は、実施例２における離脱防止装置を示す正面断面図であり、（ｂ）は、同じく側断面図である。(A) is front sectional drawing which shows the separation prevention apparatus in Example 2, (b) is a sectional side view similarly. （ａ）は、実施例３における離脱防止装置を示す正面断面図であり、（ｂ）は、同じく底面図であり、（ｃ）は、同じく側断面図である。(A) is front sectional drawing which shows the separation prevention apparatus in Example 3, (b) is a bottom view similarly, (c) is also a side sectional view.

本発明に係る離脱防止装置を実施するための形態を実施例に基づいて以下に説明する。 EMBODIMENT OF THE INVENTION The form for implementing the separation prevention apparatus which concerns on this invention is demonstrated below based on an Example.

実施例１に係る離脱防止装置につき、図１から図９を参照して説明する。以下、図１の紙面左側を流体が流れる上流側として説明する。 A detachment preventing apparatus according to Embodiment 1 will be described with reference to FIGS. Hereinafter, the left side of FIG. 1 will be described as an upstream side where fluid flows.

図１及び図２に示すように、本実施例における流体管である挿口管１と受口管２とは、例えば、地中に埋設される上水道用の、ダクタイル鋳鉄、その他鋳鉄、鋼、塩化ビニール、ポリエチレン若しくはポリオレフィン製等の流体管であって、受口管２の管軸方向側の端部は、受口管２の他の箇所よりも拡径した受口部２ａが形成されているとともに、挿口管１の管軸方向側の端部は、受口部２ａに挿入可能な挿口部１ａが形成されている。また、受口部２ａの端部には、外径方向に延設されるフランジ２ｂを有している。挿口管１及び受口管２が金属製の流体管の場合、これら挿口管１と受口管２との内周面には、挿口管１及び受口管２内を流れる流体からの防錆を行う防錆処理として、モルタルや防錆塗料、粉体樹脂塗装等によって図示しないコーティング層が形成されている。尚、本実施例では流体管内の流体は上水であるが、流体管の内部を流れる流体は必ずしも上水に限らず、例えば工業用水や下水等の他、ガスやガスと液体との気液混合体であっても構わない。 As shown in FIG. 1 and FIG. 2, the insertion tube 1 and the receiving tube 2 which are fluid tubes in the present embodiment are, for example, ductile cast iron, other cast iron, steel for waterworks buried in the ground, It is a fluid pipe made of vinyl chloride, polyethylene, polyolefin, or the like, and an end portion on the tube axis direction side of the receiving tube 2 is formed with a receiving portion 2a having a diameter larger than that of other portions of the receiving tube 2. In addition, an insertion portion 1a that can be inserted into the receiving portion 2a is formed at the end of the insertion tube 1 on the tube axis direction side. Moreover, it has the flange 2b extended in the outer-diameter direction at the edge part of the receptacle part 2a. In the case where the insertion tube 1 and the reception tube 2 are metal fluid tubes, the inner peripheral surfaces of the insertion tube 1 and the reception tube 2 are separated from the fluid flowing in the insertion tube 1 and the reception tube 2. As a rust prevention treatment for preventing rust, a coating layer (not shown) is formed by mortar, rust prevention paint, powder resin coating, or the like. In this embodiment, the fluid in the fluid pipe is clean water, but the fluid flowing in the fluid pipe is not necessarily limited to clean water. For example, in addition to industrial water, sewage, etc., gas or liquid of gas or gas and liquid It may be a mixture.

挿口部１ａが受口部２ａに挿入されることで挿口管１及び受口管２が接続され、この挿口部１ａと受口部２ａとの間隙には、挿口管１及び受口管２を密封状に密封する環状の密封部材９が介設されており、密封部材９の挿口管１側は、一部外方に露出している。このように接続された挿口管１及び受口管２には、両口管１，２の離脱を防止する本発明の離脱防止装置３が設けられる。 The insertion tube 1 and the receiving tube 2 are connected by inserting the insertion portion 1a into the receiving portion 2a, and the insertion tube 1 and the receiving tube 2 are inserted into the gap between the insertion portion 1a and the receiving portion 2a. An annular sealing member 9 that seals the mouth tube 2 in a sealing manner is interposed, and a part of the sealing member 9 on the side of the inlet tube 1 is exposed to the outside. The insertion tube 1 and the receiving tube 2 connected in this way are provided with a detachment prevention device 3 of the present invention for preventing the detachment of both the tube tubes 1 and 2.

図１ないし図４に示されるように、離脱防止装置３は、内周面に円周方向に延びる凹部４を有する本発明の離脱防止本体である押輪５と、各凹部４に収容される弓形爪６と、弓形爪６の外周端を押圧する本発明の押圧手段である押圧ボルト７と、を備えている。 As shown in FIGS. 1 to 4, the detachment prevention device 3 includes a press ring 5 that is a detachment prevention body of the present invention having a recess 4 extending in the circumferential direction on an inner peripheral surface, and an arcuate shape accommodated in each recess 4. The nail | claw 6 and the press volt | bolt 7 which is a press means of this invention which presses the outer peripheral end of the arcuate nail | claw 6 are provided.

先ず、押輪５から説明する。図１ないし図３に示すように、押輪５は、挿口管１の外周面より若干拡径されて環状に形成されており、押輪５の外周面には、フランジ２ｂに向けて貫通する貫通孔２８が周方向に所定間隔離間して複数穿設されており、この各貫通孔２８に接続ボルト１８を挿入し（図１０（ａ）及び図１１（ａ）参照）、フランジ２ｂと接続されている。また、押輪５の内周面には、周方向に連続する環状の凹部４が形成され、内径方向に開口する断面視略凹形状を成しており、当該凹部４から外径方向に所定間隔離間して配置される凹設部４ｂが複数設けられている。すなわち、各凹設部４ｂは、押輪５の内径方向に位置する前記凹部４によってそれぞれ連通している。各凹設部４ｂの内周面４ａは、受口管２に向けて拡径したテーパ状に形成されており、このテーパ状の内周面４ａには、内周面４ａに対し垂直に貫通する、すなわち管軸に対し傾斜するネジ孔１０がそれぞれ穿設されている。 First, the push wheel 5 will be described. As shown in FIGS. 1 to 3, the pusher wheel 5 is formed in an annular shape with a slightly larger diameter than the outer peripheral surface of the insertion tube 1, and the outer peripheral surface of the pusher wheel 5 penetrates toward the flange 2 b. A plurality of holes 28 are formed at predetermined intervals in the circumferential direction, and the connection bolts 18 are inserted into the respective through holes 28 (see FIGS. 10A and 11A) and connected to the flange 2b. ing. Further, an annular recess 4 that is continuous in the circumferential direction is formed on the inner peripheral surface of the pusher wheel 5 to form a substantially concave shape in sectional view that opens in the inner diameter direction, and a predetermined interval from the recess 4 in the outer diameter direction. A plurality of recessed portions 4b that are spaced apart are provided. That is, each recessed portion 4 b communicates with the recessed portion 4 positioned in the inner diameter direction of the push wheel 5. The inner peripheral surface 4a of each recessed portion 4b is formed in a tapered shape whose diameter is increased toward the receiving tube 2, and the tapered inner peripheral surface 4a penetrates perpendicularly to the inner peripheral surface 4a. In other words, screw holes 10 that are inclined with respect to the tube axis are respectively formed.

また、押輪５には、密封部材９に向けて環状に突出する突出部８が設けられており、密封部材９が突出部８に係止されることで、密封状に接続された状態を維持している。尚、この押輪は、挿口管の外周面に全周方向に一体の環状に設けられているが、例えば複数に分割され連結することで環状をなすように形成されてもよい。 Further, the pusher wheel 5 is provided with a projecting portion 8 projecting in an annular shape toward the sealing member 9, and the sealing member 9 is locked to the projecting portion 8, thereby maintaining a sealed connection state. doing. In addition, although this push ring is provided in the outer peripheral surface of the insertion tube in the shape of an integral ring in the entire circumferential direction, it may be formed in a ring shape by being divided into a plurality of pieces and connected.

次いで、弓形爪６について説明する。図４（ａ）に示されるように、弓形爪６には、略中央部から外径方向に突設された凸部６ａが形成されているとともに、内径方向に向けて刃部６ｂが形成されている。この弓形爪６は、平面視略長方形状を成しており、正面視略凸形状を成している。 Next, the bow claw 6 will be described. As shown in FIG. 4A, the arcuate claw 6 is formed with a convex portion 6a protruding from the substantially central portion in the outer diameter direction and a blade portion 6b toward the inner diameter direction. ing. The arcuate claw 6 has a substantially rectangular shape in plan view, and has a substantially convex shape in front view.

この弓形爪６は、凸部６ａを凹部４内に形成した凹設部４ｂに嵌合させることで、周方向への相対移動が規制されて押輪５内に収納されるようになっており、各凸部６ａを凹設部４ｂ内に全て嵌合した際には、複数の刃部６ｂが挿口管１の外周面に対して略全周に亘って当接するように設計されている。また、凸部６ａの突設方向の端面（外周端）は、凹設部４ｂの内周面４ａと略同一の角度で傾斜するテーパ面６ｃに形成されている。 The arcuate claw 6 is adapted to be accommodated in the pusher wheel 5 by restricting the relative movement in the circumferential direction by fitting the convex part 6a into the concave part 4b formed in the concave part 4. When all the convex portions 6a are fitted in the recessed portions 4b, the plurality of blade portions 6b are designed to contact the outer peripheral surface of the insertion tube 1 over substantially the entire circumference. Further, the end surface (outer peripheral end) in the protruding direction of the convex portion 6a is formed on a tapered surface 6c that is inclined at substantially the same angle as the inner peripheral surface 4a of the concave portion 4b.

図４（ｂ）に示されるように、刃部６ｂは、挿口管１の周方向に延びるとともに管軸方向に延びる略螺旋状に形成された第１刃部６１、及び第１刃部６１と異なる方向に延びる略螺旋状に形成された第２刃部６２から形成されている。本実施例において図４（ｂ）における紙面左側が第１刃部６１であり、紙面右側が第２刃部６２となっており、この第２刃部６２は、第１刃部６１が反転した態様の略螺旋状に形成されている。 As shown in FIG. 4B, the blade portion 6 b extends in the circumferential direction of the insertion tube 1 and is formed in a substantially spiral shape extending in the tube axis direction, and the first blade portion 61. It is formed from the 2nd blade part 62 formed in the substantially spiral shape extended in a different direction. In this embodiment, the left side of the paper surface in FIG. 4B is the first blade portion 61, and the right side of the paper surface is the second blade portion 62. In the second blade portion 62, the first blade portion 61 is inverted. It is formed in a substantially spiral shape.

これによれば、第１刃部６１及び第２刃部６２は略螺旋状に形成されており、更に第１刃部６１と第２刃部６２とが異なる方向に延びているので、両口管１，２への離脱防止力を離脱方向ばかりでなく、回転方向、更には、管軸に対し斜め方向にも発揮することができ、且つ、第１刃部６１及び第２刃部６２の係止力が挿口管１の一断面に集中せず管軸方向に分散するため、係止力集中による損傷などの影響が挿口管１内面に生じ難く、挿口管１の局所損傷を回避できる。尚、本実施例において第２刃部６２は、第１刃部６１が反転した略螺旋状に形成されているが、これに限らず、例えば、第１刃部及び第２刃部の延設される角度が互いに異なる刃部を形成しても構わない。 According to this, since the 1st blade part 61 and the 2nd blade part 62 are formed in the substantially spiral shape, and since the 1st blade part 61 and the 2nd blade part 62 are further extended in a different direction, both mouths The force for preventing the separation from the tubes 1 and 2 can be exerted not only in the direction of separation but also in the rotational direction and further in the oblique direction with respect to the tube axis, and the first blade portion 61 and the second blade portion 62 Since the locking force is not concentrated on one section of the insertion tube 1 but is dispersed in the tube axis direction, the influence of the locking force concentration is less likely to occur on the inner surface of the insertion tube 1 and local damage to the insertion tube 1 is prevented. Can be avoided. In the present embodiment, the second blade portion 62 is formed in a substantially spiral shape in which the first blade portion 61 is inverted. However, the present invention is not limited thereto, and for example, the first blade portion and the second blade portion are extended. Blade portions with different angles may be formed.

このように、第１刃部６１及び第２刃部６２は、弓形爪６に対して挿口管１の周方向に交互に配置される。また、第１刃部６１と第２刃部６２とが挿口管１の周方向に交互に配置されることで、両口管１，２への離脱防止力が一方向だけに偏らず平均化され、確実に両口管１，２の離脱防止を行うことができる。 Thus, the first blade portion 61 and the second blade portion 62 are alternately arranged in the circumferential direction of the insertion tube 1 with respect to the arcuate claw 6. In addition, since the first blade portion 61 and the second blade portion 62 are alternately arranged in the circumferential direction of the insertion tube 1, the anti-separation force to the both-end tubes 1 and 2 is averaged without being biased only in one direction. Therefore, it is possible to reliably prevent the both-end pipes 1 and 2 from being detached.

また、これ等第１刃部６１、及び第２刃部６２は、弓形爪６に対して周方向に途切れず連続している。これによれば、弓形爪６に対して第１刃部６１、及び第２刃部６２が連続して設けられることにより、弓形爪６に楔が確実に形成されるため、両口管１，２の離脱防止力を増大させることができる。尚、必ずしも第１刃部、及び第２刃部が弓形爪に対して周方向に連続するものに限らず、第１刃部、及び第２刃部が弓形爪に対して離間して形成されてもよい。 Further, the first blade portion 61 and the second blade portion 62 are continuous with the arcuate claw 6 without interruption in the circumferential direction. According to this, since the first blade portion 61 and the second blade portion 62 are continuously provided on the arcuate claw 6, a wedge is reliably formed on the arcuate claw 6. 2 can be increased. Note that the first blade portion and the second blade portion are not necessarily continuous in the circumferential direction with respect to the arcuate claw, and the first blade portion and the second blade portion are formed apart from the arcuate claw. May be.

第１刃部６１と第２刃部６２との連続部６３は、挿口管１の軸方向にピッチが小さい緩やかな螺旋曲線を描いて形成されている。このように、第１刃部６１と第２刃部６２との連続部６３が緩やかな曲線状になっていることで、鋭角な部分を有さず、連続部６３の尖端に割れや欠け等が起こる慮がない。更に、刃部６ｂは、受口管２方向に傾いて鋭利に形成されており、挿口管１と受口管２との離脱方向の相対移動に対抗するようになっている。 The continuous portion 63 of the first blade portion 61 and the second blade portion 62 is formed by drawing a gentle spiral curve having a small pitch in the axial direction of the insertion tube 1. As described above, the continuous portion 63 of the first blade portion 61 and the second blade portion 62 has a gentle curved shape, so that it does not have an acute angle portion, and a crack, a chip, or the like is present at the tip of the continuous portion 63. There is no reason to happen. Further, the blade portion 6b is sharply formed to be inclined in the direction of the receiving tube 2, and resists relative movement of the insertion tube 1 and the receiving tube 2 in the separation direction.

更に、刃部６ｂは、弓形爪６の短手方向に等間隔に略平行に離間して３条配設されている。すなわち刃部６ｂが挿口管１の軸方向に３条配置してあるので、両口管１，２への離脱防止力が増大するばかりでなく、弓形爪６が安定して配置されるとともに、第１刃部６１及び第２刃部６２が挿口管１の外周面に食込む際の食込み力が多数の刃部６ｂに分散されるため、挿口管１の外周面や内周面に形成した防食用ライニング層に割れや剥離が発生するのを抑制することができる。また、挿口管１が屈曲変形していても弓形爪６が挿口管１の軸方向に３列配置されてあるので、挿口管１の屈曲変形に沿って弓形爪６の刃部６ｂが挿口管１の外周面に食込むことができ、確実に離脱防止を行うことができる。尚、刃部は、挿口管の管軸方向に等間隔に略平行に離間して３条配設されているが、これに限らず、様々な間隔にまたは非平行に離間されてもよく、更に１条または２条配設されてもよいし、４条以上の複数に配設されてもよい。また、刃部は、管軸方向に形状の異なる刃部を複数配置してもよい。 Further, the three blade portions 6b are arranged in the short direction of the arcuate claw 6 so as to be spaced apart at approximately equal intervals. That is, since the three blade portions 6b are arranged in the axial direction of the insertion tube 1, not only the force for preventing the separation to the two-end tubes 1 and 2 is increased, but the arcuate claw 6 is stably disposed. Since the biting force when the first blade portion 61 and the second blade portion 62 bite into the outer peripheral surface of the insertion tube 1 is dispersed in a large number of blade portions 6b, the outer peripheral surface and inner peripheral surface of the insertion tube 1 It can suppress that a crack and peeling generate | occur | produce in the anticorrosion lining layer formed in this. Further, even if the insertion tube 1 is bent and deformed, the arcuate claws 6 are arranged in three rows in the axial direction of the insertion tube 1, so that the blade portion 6 b of the arcuate claw 6 along the bending deformation of the insertion tube 1. Can bite into the outer peripheral surface of the insertion tube 1 and can be surely prevented from being detached. In addition, although the blade portion is arranged in three strips spaced substantially parallel to each other at equal intervals in the tube axis direction of the insertion tube, the blade portion is not limited to this, and may be spaced at various intervals or non-parallel. Further, one or two strips may be disposed, or a plurality of four or more strips may be disposed. Further, the blade portion may be provided with a plurality of blade portions having different shapes in the tube axis direction.

このように構成された弓形爪６は、凹設部４ｂに嵌合され、且つ凹部４に沿って押輪５内に収容される。つまり、各弓形爪６は、挿口管１の管軸方向に略同じ位置で周方向に沿ってそれぞれ配設される。これによれば、弓形爪６が挿口管１の管軸方向に略同じ位置で、且つ周方向に沿って配設されることにより、挿口管１の管軸方向に大きなスペースを必要とせず、弓形爪６の範囲で確実に離脱防止を行うことができるため、かかる離脱防止装置３をコンパクトにすることができる。 The arcuate claw 6 configured as described above is fitted into the recessed portion 4 b and is accommodated in the pusher wheel 5 along the recessed portion 4. That is, each arcuate claw 6 is disposed along the circumferential direction at substantially the same position in the tube axis direction of the insertion tube 1. According to this, the arcuate claw 6 is disposed at substantially the same position in the tube axis direction of the insertion tube 1 and along the circumferential direction, so that a large space is required in the tube axis direction of the insertion tube 1. Therefore, since the separation prevention can be surely performed within the range of the arcuate claw 6, the separation prevention device 3 can be made compact.

そして、弓形爪６が凹部４に嵌合されて収容される際には、前述したように弓形爪６の刃部６ｂが挿口管１の外周面に対して略全周に亘って当接するように設計されているため、挿口管１の外周面全体に均等に両口管１，２への離脱防止力を作用させることができる。 When the arcuate claw 6 is fitted and accommodated in the recess 4, the blade part 6 b of the arcuate claw 6 contacts the outer peripheral surface of the insertion tube 1 over substantially the entire circumference as described above. Since it is designed in such a manner, it is possible to apply the detachment preventing force to the both-end tubes 1 and 2 evenly over the entire outer peripheral surface of the insertion tube 1.

また図３に示すように、弓形爪６には、刃部６ｂの表面から管軸方向における挿口管１側の側面にかけて介在部材１２が接着されている。この介在部材１２は、刃部６ｂの表面に位置する防食部１２ａを有しているとともに、弓形爪６と凹部４内との間隙に延設される弾性部１２ｂを有している。すなわち、防食部１２ａ、及び弾性部１２ｂは、一体の介在部材１２によって形成されている。このように、弓形爪６の刃部６ｂの表面は、介在部材１２の防食部１２ａにより覆われているので、防食部１２ａが、刃部６ｂと刃部６ｂが食い込む挿口管１の外周面とに介在することになるため、刃部６ｂ及び挿口管１の外周面の腐食を防止することができ、長期に亘り離脱防止効果を維持することができる。尚、本発明の防食部は、刃部の表面に設けられていれば、例えば接着若しくは固着でもよいし、あるいは融着、蒸着、嵌合等の取付態様でも構わない。さらに、弓形爪６は、弾性部１２ｂの弾性変形力によって凹部４内から落下することが防がれるとともに、弓形爪６の刃部６ｂを挿口管１の外周面に付勢して食込ませることを補助する補助手段として用いることができる。 Further, as shown in FIG. 3, the interposition member 12 is bonded to the arcuate claw 6 from the surface of the blade portion 6 b to the side surface on the insertion tube 1 side in the tube axis direction. The interposition member 12 has a corrosion prevention portion 12 a located on the surface of the blade portion 6 b and an elastic portion 12 b extending in the gap between the arcuate claw 6 and the recess 4. That is, the anticorrosion part 12a and the elastic part 12b are formed by the integral interposition member 12. Thus, since the surface of the blade part 6b of the arcuate claw 6 is covered with the anticorrosion part 12a of the interposition member 12, the anticorrosion part 12a is the outer peripheral surface of the insertion tube 1 into which the blade part 6b and the blade part 6b bite. Therefore, corrosion of the outer peripheral surface of the blade portion 6b and the insertion tube 1 can be prevented, and the effect of preventing separation can be maintained for a long time. In addition, as long as the anticorrosion part of this invention is provided in the surface of the blade part, adhesion | attachment or adhering may be sufficient, for example, and attachment aspects, such as melt | fusion, vapor deposition, and fitting, may be sufficient. Further, the arcuate claw 6 is prevented from falling from within the recess 4 due to the elastic deformation force of the elastic part 12b, and the blade part 6b of the arcuate claw 6 is urged toward the outer peripheral surface of the insertion tube 1 to bite. It can be used as an auxiliary means for assisting in bending.

また、防食部１２ａ、及び弾性部１２ｂを備えた介在部材１２が一体に形成されることにより、弓形爪６に容易に取り付けることができるとともに、介在部材１２の構造を簡素化できる。この介在部材１２は、例えば、湿気硬化型ウレタン樹脂、或いは、天然ゴム、ウレタンゴム、その他合成樹脂等の弾性を有する材料によって形成されている。尚、本実施例では、防食部１２ａ、及び弾性部１２ｂが一体に設けられ、同一の材料によって形成されているが、これに限らず、防食部、及び弾性部をそれぞれ別体の介在部材で形成し、または別々の材料で形成されるようにしてもよい。更に尚、弾性部は、凹部内にあらかじめ設けられていてもよい。 In addition, since the interposition member 12 including the anticorrosion portion 12a and the elastic portion 12b is integrally formed, it can be easily attached to the arcuate claw 6 and the structure of the interposition member 12 can be simplified. The interposition member 12 is formed of an elastic material such as moisture-curing urethane resin, natural rubber, urethane rubber, or other synthetic resin. In this embodiment, the anticorrosion part 12a and the elastic part 12b are integrally provided and formed of the same material. However, the present invention is not limited to this, and the anticorrosion part and the elastic part are respectively provided as separate interposed members. It may be formed or formed of separate materials. Furthermore, the elastic part may be provided in advance in the recess.

次に押圧ボルト７について説明する。押圧ボルト７は、ネジ孔１０に螺挿される。前述したようにネジ孔１０は、凹設部４ｂの内周面４ａに垂直に穿設されており、且つ弓形爪６における凸部６ａの突設方向の端面は、凹設部４ｂの内周面４ａと略同一の角度で傾斜するテーパ面６ｃとなっている。したがって、押圧ボルト７の先端部７ａは、テーパ面６ｃに対して垂直に当接するようになり、押圧ボルト７の押圧力を弓形爪６に効率よく伝え、刃部６ｂを挿口管１の外周面に食込ませることができる。尚、弓形爪の押圧手段は、本実施例のように押圧ボルトだけに限らず、例えば、バネ部材や弾性部材を用いて弓形爪を押圧してもよい。 Next, the pressing bolt 7 will be described. The pressing bolt 7 is screwed into the screw hole 10. As described above, the screw hole 10 is formed perpendicularly to the inner peripheral surface 4a of the recessed portion 4b, and the end surface of the projecting direction of the convex portion 6a in the arcuate claw 6 is the inner periphery of the recessed portion 4b. The tapered surface 6c is inclined at substantially the same angle as the surface 4a. Accordingly, the tip 7 a of the pressing bolt 7 comes into contact with the tapered surface 6 c perpendicularly, and the pressing force of the pressing bolt 7 is efficiently transmitted to the arcuate claw 6, and the blade 6 b is transmitted to the outer periphery of the inlet tube 1. Can be bitten into the surface. Note that the means for pressing the arcuate claw is not limited to the pressing bolt as in this embodiment, and for example, the arcuate claw may be pressed using a spring member or an elastic member.

このように刃部６ｂが挿口管１の外周面に食込む際には、刃部６ｂが介在部材１２の防食部１２ａを突き破って挿口管１の外周面に食込み、この刃部６ｂ及び挿口管１の外周面の間隙を防食部１２ａが弾性変形しながら密着することで刃部６ｂと挿口管１の外周面との当接箇所が防食される。 Thus, when the blade portion 6b bites into the outer peripheral surface of the insertion tube 1, the blade portion 6b breaks through the anticorrosion portion 12a of the interposition member 12 and bites into the outer peripheral surface of the insertion tube 1, and the blade portion 6b and The contact portion between the blade portion 6b and the outer peripheral surface of the insertion tube 1 is anticorrosive by closely contacting the gap between the outer peripheral surfaces of the insertion tube 1 while the anticorrosion portion 12a is elastically deformed.

次に、このように離脱防止装置３によって接続された挿口管１と受口管２とに離脱しようとする外力が働いた際の弓形爪６及び凹部４について説明する。 Next, the arcuate claw 6 and the concave portion 4 when an external force to be detached acts on the insertion tube 1 and the receiving tube 2 connected by the separation preventing device 3 in this way will be described.

挿口管１と受口管２とに離脱しようとする外力が作用しても、この外力を利用して弓形爪６のテーパ面６ｃが押圧ボルト７の先端部７ａに当接するだけでなく、テーパ面６ｃ押圧ボルト７の先端部７ａに沿ってテーパ面６ｃが摺動することで弓形爪６が内径方向に押圧され、刃部６ｂが挿口管１の外周面にさらに食い込むようになる。これにより、弓形爪６の係止力が向上するようになり、挿口管１と受口管２との離脱が防止される。 Even if an external force is applied to the insertion tube 1 and the receiving tube 2, the taper surface 6 c of the arcuate claw 6 not only makes contact with the tip 7 a of the pressing bolt 7 by using this external force, Tapered surface 6c The tapered surface 6c slides along the tip 7a of the pressing bolt 7, whereby the arcuate claw 6 is pressed in the inner diameter direction, and the blade portion 6b further bites into the outer peripheral surface of the insertion tube 1. As a result, the locking force of the arcuate claw 6 is improved, and the detachment between the insertion tube 1 and the receiving tube 2 is prevented.

以上説明したように、本発明の離脱防止装置によれば、挿口管１の外周面に外嵌され、かつ内周面に円周方向に延びる凹部４を有する押輪５と、凹部４内にそれぞれ収容され、内周側の先端部に挿口管１の外周面に食込み可能な刃部６ｂを有する複数の弓形爪６と、弓形爪６のテーパ面６ｃを押圧することにより、刃部６ｂを挿口管１の外周面に食込ませる押圧ボルト７と、を備える挿口管１の離脱防止装置３において、刃部６ｂは、挿口管１の周方向に延びるとともに管軸方向に延びる略螺旋状に形成された第１刃部６１、及び第１刃部６１と異なる方向に延びる略螺旋状に形成された第２刃部６２からなり、第１刃部６１及び第２刃部６２が挿口管１の周方向に交互に配置される離脱防止装置３である。これによれば、第１刃部６１及び第２刃部６２は略螺旋状に形成されており、更に第１刃部６１と第２刃部６２とが異なる方向に延びているので、両口管１，２の離脱防止力を離脱方向や回転方向等の多方向に発揮することができ、且つ、第１刃部６１及び第２刃部６２の係止力が挿口管１の一断面に集中せず管軸方向に分散するため、係止力集中による損傷などの影響が挿口管１内面に生じ難く、挿口管１の局所損傷を回避できる。また、第１刃部６１と第２刃部６２とが挿口管１の周方向に交互に配置されることで、両口管１，２の離脱防止力が一方向だけに偏らず平均化され、確実に両口管１，２の離脱防止を行うことができる。 As described above, according to the separation preventing device of the present invention, the press ring 5 having the recess 4 that is fitted on the outer peripheral surface of the insertion tube 1 and extends in the circumferential direction on the inner peripheral surface, and the recess 4 By pressing a plurality of arcuate claws 6 each having a blade part 6b that can be accommodated in the outer peripheral surface of the insertion tube 1 at the inner peripheral side distal end and the tapered surface 6c of the arcuate claw 6, the blade part 6b In the detachment prevention device 3 for the insertion tube 1, which includes a pressing bolt 7 that bites the outer periphery of the insertion tube 1, the blade portion 6 b extends in the circumferential direction of the insertion tube 1 and extends in the tube axis direction. The first blade portion 61 and the second blade portion 62 include a first blade portion 61 formed in a substantially spiral shape and a second blade portion 62 formed in a substantially spiral shape extending in a different direction from the first blade portion 61. Are the separation prevention devices 3 arranged alternately in the circumferential direction of the intubation tube 1. According to this, since the 1st blade part 61 and the 2nd blade part 62 are formed in the substantially spiral shape, and since the 1st blade part 61 and the 2nd blade part 62 are further extended in a different direction, both mouths The detachment preventing force of the tubes 1 and 2 can be exerted in multiple directions such as the detachment direction and the rotation direction, and the locking force of the first blade portion 61 and the second blade portion 62 is a section of the insertion tube 1. Therefore, the damage due to the concentration of the locking force hardly occurs on the inner surface of the insertion tube 1 and local damage to the insertion tube 1 can be avoided. In addition, since the first blade portion 61 and the second blade portion 62 are alternately arranged in the circumferential direction of the insertion tube 1, the detachment preventing force of both the mouth tubes 1 and 2 is averaged without being biased only in one direction. Thus, it is possible to reliably prevent the both-end pipes 1 and 2 from being detached.

次に、本発明の離脱防止装置における弓形爪の変形例を説明する。以下、図５、図６における紙面上側を弓形爪が係止する流体管の離脱方向とし、紙面下側を同じく流体管の挿入方向として説明する。尚、前記実施例と同一構成で重複する構成の説明を省略する。 Next, a modified example of the bow claw in the separation preventing device of the present invention will be described. In the following description, the upper side of the paper surface in FIGS. 5 and 6 will be described as the direction of detachment of the fluid pipe engaged by the arcuate claw, and the lower side of the paper surface will be described as the insertion direction of the fluid pipe. The description of the same configuration as that of the above embodiment is omitted.

先ず、弓形爪の第１変形例について説明すると、図５（ａ）に示されるように弓形爪１６は、弓形爪１６が係止する流体管の離脱方向側の側面１６ｄが底面視逆Ｖ字形状に屈折しており、該側面１６ｄの尖端は流体管の離脱方向側を向いている。すなわち、弓形爪１６は、平面視略五角形状に形成されている。更に前記実施例と同様に弓形爪１６の刃部１６ｂは、周方向に連続する第１刃部１６１と第２刃部１６２とから形成されており、弓形爪１６の流体管の管軸方向に等間隔に離間して３条配設されているとともに、これ等３条の刃部１６ｂのうちの１条は、弓形爪１６の側面１６ｄの形状に沿って形成されている。このように形成された刃部１６ｂは、流体管の挿入方向に傾いて形成されている。 First, the first modified example of the arcuate claw will be described. As shown in FIG. 5 (a), the arcuate claw 16 has a side face 16d on the side in the direction of detachment of the fluid pipe that is engaged with the arcuate claw 16 and is reverse V-shaped in bottom view. It is refracted into a shape, and the tip of the side surface 16d is directed to the direction of separation of the fluid pipe. That is, the arcuate claw 16 is formed in a substantially pentagonal shape in plan view. Further, similarly to the above embodiment, the blade portion 16b of the arcuate claw 16 is formed of a first blade portion 161 and a second blade portion 162 which are continuous in the circumferential direction, and is arranged in the tube axis direction of the fluid pipe of the arcuate claw 16. Three strips are arranged at regular intervals, and one of the three blade portions 16b is formed along the shape of the side surface 16d of the arcuate claw 16. The blade portion 16b formed in this way is formed to be inclined in the fluid tube insertion direction.

したがって、第１刃部１６１と第２刃部１６２とが直線状に連続する連続部１６３の楔状の尖端が流体管の離脱方向側を向いて配置されるようになる。これによれば、ここでは図示しない流体管に対して離脱方向に相対移動させる外力が働いた場合、刃部１６ｂの周方向の両端部から刃部１６ｂの中央部に向けて漸次流体管の外面に食い込むようになり、更に連続部１６３の楔状の尖端が流体管の外面に強固に食い込むようになり、流体管の離脱が防止される。 Accordingly, the wedge-shaped point of the continuous portion 163 in which the first blade portion 161 and the second blade portion 162 are linearly continuous is arranged facing the fluid tube detachment direction side. According to this, when an external force that moves relative to a fluid pipe (not shown) is applied here, the outer surface of the fluid pipe gradually moves from both circumferential ends of the blade portion 16b toward the central portion of the blade portion 16b. In addition, the wedge-shaped tip of the continuous portion 163 firmly bites into the outer surface of the fluid pipe, thereby preventing the fluid pipe from being detached.

また、凹部１４は、弓形爪１６が収納された際に側面１６ｄと対応した内側面１４ｂを備えている。これによって、弓形爪１６が凹部１４の内側面１４ｂに側面１６ｄの全面で当接するようになり、押輪（図示略）による初期の締め付け状態を安定して維持することができる。 The recess 14 includes an inner side surface 14b corresponding to the side surface 16d when the arcuate claw 16 is stored. As a result, the arcuate claw 16 comes into contact with the inner side surface 14b of the recess 14 over the entire side surface 16d, and the initial tightening state by the push wheel (not shown) can be stably maintained.

次に、弓形爪の第２変形例について説明すると、図５（ｂ）に示されるように、弓形爪２６の刃部２６ｂは、第１刃部２６１と第２刃部２６２とから形成されており、これ等第１刃部２６１と第２刃部２６２とは、弓形爪２６の周方向に交互に２条ずつ配置されて連続している。これによれば、一つの弓形爪２６に楔状の連続部２６３が確実に複数形成されるため、流体管の離脱防止力を向上させることができる。尚、第１刃部２６１と第２刃部２６２が弓形爪２６の周方向に交互に２条ずつ配置されているが、例えば第１刃部と第２刃部とを弓形爪の周方向に交互に３条以上ずつ複数設けてもよい。また、前記第１変形例と同様に第２変形例の凹部は、弓形爪２６の側面と対応した内側面を備えている。 Next, a second modification of the bow claw will be described. As shown in FIG. 5B, the blade portion 26b of the bow claw 26 is formed of a first blade portion 261 and a second blade portion 262. The first blade portion 261 and the second blade portion 262 are continuously arranged in such a manner that two ridges are alternately arranged in the circumferential direction of the arcuate claw 26. According to this, since a plurality of wedge-shaped continuous portions 263 are surely formed on one arcuate claw 26, it is possible to improve the detachment preventing force of the fluid pipe. In addition, although the 1st blade part 261 and the 2nd blade part 262 are alternately arrange | positioned 2 pieces at a time in the circumferential direction of the arcuate nail | claw 26, for example, a 1st blade part and a 2nd blade part are arranged in the circumferential direction of an arcuate nail | claw. A plurality of three or more may be alternately provided. Similarly to the first modified example, the concave portion of the second modified example has an inner surface corresponding to the side surface of the arcuate claw 26.

次に、弓形爪の第３変形例について図５（ｃ）を用いて説明すると、前記第２変形例と同様に第１刃部３６１と第２刃部３６２とが弓形爪３６の周方向に交互に２条ずつ配置されて連続している。更に、これ等第１刃部３６１と第２刃部３６２とは、緩やかな曲線を描いて形成されているとともに、第１刃部３６１と第２刃部３６２との連続部３６３も、緩やかな曲線を描いて形成されている。すなわち、第１刃部３６１と第２刃部３６２とは、弓形爪３６の周方向に波線状に連続している。これによれば、離脱方向、回転方向、及び斜め方向等への流体管の相対移動に対して、均等に流体管への離脱防止力を発揮することができ、流体管への離脱防止力が流体管の局部に集中することがない。また、前記第１変形例と同様に第３変形例の凹部は、弓形爪３６の側面と対応した内側面を備えている。 Next, a third modified example of the arcuate claw will be described with reference to FIG. 5C. Similar to the second modified example, the first blade part 361 and the second blade part 362 are arranged in the circumferential direction of the arcuate claw 36. Two lines are arranged alternately and are continuous. Further, the first blade portion 361 and the second blade portion 362 are formed in a gentle curve, and the continuous portion 363 between the first blade portion 361 and the second blade portion 362 is also gentle. It is formed by drawing a curve. That is, the first blade portion 361 and the second blade portion 362 are continuous in a wavy line in the circumferential direction of the arcuate claw 36. According to this, with respect to the relative movement of the fluid pipe in the separation direction, the rotation direction, the oblique direction, etc., the separation prevention force to the fluid pipe can be exhibited evenly, and the separation prevention force to the fluid pipe is There is no concentration in the local area of the fluid pipe. Similarly to the first modified example, the concave portion of the third modified example has an inner surface corresponding to the side surface of the arcuate claw 36.

次に、弓形爪の第４変形例について図５（ｄ）を用いて説明すると、弓形爪４６が係止する流体管の挿入方向側の側面４６ｄが底面視略Ｖ字形状に屈折しており、該側面４６ｄの尖端は流体管の挿入方向側を向いている。そして第１刃部４６１と第２刃部４６２との連続部４６３の尖端も流体管の挿入方向側を向いて配置されている。これによれば、ここでは図示しない流体管に対して挿入方向に相対移動させる外力が働いた場合、連続部４６３の尖端を流体管の外面に強固に食い込ませることができ、流体管の過挿入を防止することができる。また、前記第１変形例と同様に凹部４４は、弓形爪４６が収納された際に側面４６ｄと対応した内側面４４ｂを備えている。このような弓形爪４６を前記実施例１及び前記弓形爪の第１変形例ないし第３変形例等と組み合わせて流体管の外周面に配置することにより、流体管の離脱防止だけでなく過挿入防止も行うことができる。 Next, a fourth modified example of the arcuate claw will be described with reference to FIG. 5D. The side surface 46d on the fluid tube insertion direction side engaged with the arcuate claw 46 is refracted into a substantially V shape when viewed from the bottom. The tip of the side surface 46d faces the fluid tube insertion direction. The tip of the continuous portion 463 of the first blade portion 461 and the second blade portion 462 is also arranged facing the fluid tube insertion direction side. According to this, when an external force that moves relative to the fluid pipe (not shown) is applied here, the tip of the continuous portion 463 can be firmly bited into the outer surface of the fluid pipe, and the fluid pipe is excessively inserted. Can be prevented. Similarly to the first modification, the recess 44 includes an inner side surface 44b corresponding to the side surface 46d when the arcuate claw 46 is accommodated. By arranging such an arcuate claw 46 on the outer peripheral surface of the fluid pipe in combination with the first embodiment and the first to third modifications of the arcuate claw, not only the fluid pipe is prevented from being detached but also excessively inserted. Prevention can also be performed.

次に、弓形爪の第５変形例について図６（ａ）を用いて説明すると、第１変形例と同様に、弓形爪５６の刃部５６ｂは、第１刃部５６１と第２刃部５６２とから形成されており、底面視逆Ｖ字状を成している。これ等、第１刃部５６１と第２刃部５６２との連続部３６３は、尖端が流体管の離脱方向側を向いて配置されるようになる。更に、弓形爪５６は平面視略長方形状を成している。 Next, a fifth modified example of the arcuate claw will be described with reference to FIG. 6A. Similarly to the first modified example, the blade part 56b of the arcuate claw 56 has a first blade part 561 and a second blade part 562. And has an inverted V shape when viewed from the bottom. In these cases, the continuous portion 363 of the first blade portion 561 and the second blade portion 562 is arranged such that the tip end faces the direction of detachment of the fluid pipe. Further, the arcuate claw 56 has a substantially rectangular shape in plan view.

次に、弓形爪の第６変形例について図６（ｂ）を用いて説明すると、第４変形例と同様に、第１刃部６６１と第２刃部６６２との連続部６６３の尖端は流体管の挿入方向側を向いて配置されている。更に、弓形爪６６は平面視略長方形状を成している。 Next, the sixth modified example of the bow claw will be described with reference to FIG. 6B. As in the fourth modified example, the tip of the continuous portion 663 of the first blade portion 661 and the second blade portion 662 is a fluid. It arrange | positions facing the insertion direction side of a pipe | tube. Further, the arcuate claw 66 has a substantially rectangular shape in plan view.

次に、弓形爪の第７変形例について図６（ｃ）を用いて説明すると、一方の弓形爪７６及び他方の弓形爪７６’は、平面視略長方形状を成している。一方の弓形爪７６には、前記流体管の周方向に延びるとともに管軸方向に延びる略螺旋状に形成された第１刃部７６１が所定間隔離間して３条設けられている。また、他方の弓形爪７６’には、第１刃部７６１と異なる方向に延びる略螺旋状に形成された第２刃部７６２が所定間隔離間して３条設けられている。これ等、一方の弓形爪７６及び他方の弓形爪７６’は、前記流体管の管軸方向に略同じ位置で周方向に沿って所定間隔離間して交互に並んで配置されている。 Next, a seventh modified example of the arcuate claw will be described with reference to FIG. 6C. One arcuate claw 76 and the other arcuate claw 76 'have a substantially rectangular shape in plan view. One arcuate claw 76 is provided with three first blade portions 761 formed in a substantially spiral shape extending in the circumferential direction of the fluid pipe and extending in the pipe axis direction at a predetermined interval. The other arcuate claw 76 'has three second blade portions 762 formed in a substantially spiral shape extending in a direction different from the first blade portion 761 and spaced apart from each other by a predetermined distance. The one arcuate claw 76 and the other arcuate claw 76 'are alternately arranged at predetermined intervals along the circumferential direction at substantially the same position in the tube axis direction of the fluid pipe.

これによれば、一つの弓形爪７６または弓形爪７６’に、いずれか１種類のみの刃部を設ければよく、弓形爪の製造が容易である。尚、これ等弓形爪７６及び他方の弓形爪７６’が前記流体管の周方向に所定間隔離間して配置されているものに限らず、周方向に連続するように当接させて配置してもよい。 According to this, only one type of blade portion may be provided on one arcuate claw 76 or arcuate claw 76 ', and the manufacture of the arcuate claw is easy. The arcuate claw 76 and the other arcuate claw 76 ′ are not limited to those arranged at a predetermined interval in the circumferential direction of the fluid pipe, but are arranged so as to be continuous in the circumferential direction. Also good.

次に、本発明の離脱防止装置における離脱防止本体の変形例を図７ないし図９を参照して説明する。尚、前記実施例と同一構成で重複する構成の説明を省略する。 Next, modifications of the separation preventing main body in the separation preventing apparatus of the present invention will be described with reference to FIGS. The description of the same configuration as that of the above embodiment is omitted.

先ず、離脱防止本体の変形例について説明すると、図７に示されるように、受口部２ａに挿口部１ａを挿入した後、受口部２ａの端部から外径方向に延設されるフランジ２ｂと、挿口部１ａの外周面に取り付けられる接続部材１９とをボルト・ナット２２で緊締して接続する。このように接続された流体管の挿口管１には、フランジ２ｂと接続部材１９とを被覆する離脱防止本体としての支持輪１５が取り付けられる。この支持輪１５の受口部２ａ側の端部は、受口部２ａの内径方向に向けて突出する突部１５ｂを有する鉤部１５ａが形成されており、この鉤部１５ａは、挿口管１の外周面側からフランジ２ｂの後端面２ｃ側に渡って架設されている。したがって支持輪１５は、フランジ２ｂの後端面２ｃに突部１５ｂが当接し、離脱不可能に係止されることで、フランジ２ｂを介して受口部２ａに支持されるようになる。 First, a modified example of the detachment prevention main body will be described. As shown in FIG. 7, after the insertion port 1a is inserted into the receiving port 2a, it extends from the end of the receiving port 2a in the outer diameter direction. The flange 2b and the connection member 19 attached to the outer peripheral surface of the insertion portion 1a are tightened and connected with bolts and nuts 22. A support ring 15 as a detachment prevention main body that covers the flange 2b and the connecting member 19 is attached to the inlet pipe 1 of the fluid pipe thus connected. The end of the support ring 15 on the side of the receiving port 2a is formed with a flange 15a having a protrusion 15b that protrudes toward the inner diameter of the receiving port 2a. 1 from the outer peripheral surface side to the rear end surface 2c side of the flange 2b. Accordingly, the support wheel 15 is supported by the receiving portion 2a via the flange 2b when the protrusion 15b comes into contact with the rear end surface 2c of the flange 2b and is locked so as not to be detached.

次に、離脱防止本体の別の変形例について説明すると、図８に示されるように、受口部２０ａの内周面の全周方向に設けられた環状の間隙にシール材２７が嵌合されており、このシール材２７によって挿口部１ａと受口部２０ａとが密封状に閉塞されている。また、受口部２０ａの先端部には、外周面の一部が周方向に沿って受口部２０ａの拡径方向側に膨出する膨出部２０ｂが形成されている。このように形成された膨出部２０ｂを被覆するように、離脱防止本体としての支持輪２５が設けられ、受口部２０ａの径方向に向けて突出する突部２５ｂを有する鉤部２５ａが、膨出部２０ｂの後端面２０ｃに架設されるとともに、膨出部２０ｂの後端面２０ｃと突部２５ｂとが当接し、離脱不可能に係止されることで、膨出部２０ｂを介して受口部２０ａに支持されるようになっている。 Next, another modified example of the detachment preventing main body will be described. As shown in FIG. 8, the sealing material 27 is fitted into an annular gap provided in the entire circumferential direction of the inner peripheral surface of the receiving port 20a. The insertion portion 1a and the receiving portion 20a are sealed in a sealed manner by the sealing material 27. In addition, a bulging portion 20b in which a part of the outer peripheral surface bulges along the circumferential direction toward the diameter increasing direction of the receiving portion 20a is formed at the distal end portion of the receiving portion 20a. A support ring 25 as a detachment prevention main body is provided so as to cover the bulging portion 20b formed in this way, and a flange portion 25a having a protrusion 25b protruding in the radial direction of the receiving portion 20a is provided. The rear end surface 20c of the bulging portion 20b is installed on the rear end surface 20c, and the rear end surface 20c of the bulging portion 20b and the projection 25b come into contact with each other and are locked so as not to be detached, so that they can be received via the bulging portion 20b. It is supported by the mouth 20a.

次に、離脱防止本体の更に別の変形例について説明すると、図９に示されるように、上述した離脱防止本体の別の変形例と同様に受口部２１ａの内周面の全周方向に設けられた環状の間隙にシール材２７が嵌合されており、このシール材２７によって挿口部１ａと受口部２１ａとが密封状に閉塞されている。さらに、離脱防止本体としての受口部２１ａの先端部の内周面には、前記実施例１と同様に凹部２４が設けられており、この凹部２４に弓形爪が収納されている。このように、離脱防止本体として受口部２１ａ自体の先端部の内周面に凹部２４を設けることにより、流体管の離脱防止に係る離脱防止装置の部品点数を減らすことができる。 Next, another modified example of the detachment prevention main body will be described. As shown in FIG. 9, in the same manner as the other modification of the detachment prevention main body described above, in the entire circumferential direction of the inner peripheral surface of the receiving portion 21 a. A sealing material 27 is fitted in the provided annular gap, and the insertion portion 1a and the receiving portion 21a are closed in a sealing manner by the sealing material 27. Further, a concave portion 24 is provided on the inner peripheral surface of the distal end portion of the receiving portion 21a as a detachment preventing main body as in the first embodiment, and an arcuate claw is accommodated in the concave portion 24. Thus, by providing the recess 24 on the inner peripheral surface of the distal end portion of the receiving port 21a itself as a detachment prevention main body, the number of parts of the detachment prevention device for preventing the detachment of the fluid pipe can be reduced.

次に、実施例２に係る離脱防止装置につき、図１０を参照して説明する。尚、前記実施例と同一構成で重複する構成の説明を省略する。 Next, a separation preventing apparatus according to the second embodiment will be described with reference to FIG. The description of the same configuration as that of the above embodiment is omitted.

本実施例における離脱防止装置１３は、前記実施例１と同様に挿口部１ａが受口部２ａに挿入されることで挿口管１及び受口管２が接続され、この挿口部１ａと受口部２ａとの間隙には、挿口管１及び受口管２を密封状に密封する環状の密封部材９が介設されており、このように接続された両口管１，２の離脱を防止するものである。 In the detachment preventing device 13 in the present embodiment, the insertion tube 1 and the reception tube 2 are connected by inserting the insertion portion 1a into the reception portion 2a as in the first embodiment, and the insertion portion 1a. An annular sealing member 9 that seals the insertion tube 1 and the receiving tube 2 in a sealing manner is interposed in the gap between the receiving tube 2a and the receiving port 2a. It is intended to prevent the withdrawal of.

押輪４５には、凹部４０が設けられ、この凹部４０における挿口管１側の周縁面４０ａが挿口管１方向に縮径するテーパ状に形成されている。更に、押輪４５には、挿口管１の管軸方向に直交するネジ孔１０’が穿設されており、このネジ孔１０’には、押圧ボルト７’が挿入される。 The pusher wheel 45 is provided with a recess 40, and a peripheral surface 40 a on the side of the insertion tube 1 in the recess 40 is formed in a tapered shape whose diameter decreases in the direction of the insertion tube 1. Further, a screw hole 10 'perpendicular to the tube axis direction of the insertion tube 1 is formed in the pusher wheel 45, and a pressing bolt 7' is inserted into the screw hole 10 '.

図１０（ｂ）に示されるように、凹部４０には、弓形爪６０がそれぞれ収納され、各弓形爪６０は、周方向に連続するように設定されている。この弓形爪６０の挿口管１側の周縁面には、凹部４０の周縁面４０ａと略同一角度傾斜したテーパ面６０ｃが形成されているとともに、弓形爪６０の受口管２側には、介在部材１２Ｂが設けられている。この介在部材１２Ｂは、弾性を有する材料で形成された本発明の弾性部である。更に、弓形爪６０には、前記実施例１と同様の構成で挿口管１に向けて刃部６０ｂが延設されているとともに、弓形爪６０の刃部６０ｂの表面は、介在部材１２Ａにより覆われている。この介在部材１２Ａは、刃部６０ｂの防錆を行う本発明の防錆部である。これ等介在部材１２Ａ、１２Ｂは同一種類の材料で形成されてもよいし、別種類の材料で形成されてもよい。 As shown in FIG. 10B, each of the arcuate claws 60 is accommodated in the recess 40, and each arcuate claw 60 is set to be continuous in the circumferential direction. A tapered surface 60c inclined at substantially the same angle as the peripheral surface 40a of the recess 40 is formed on the peripheral surface of the bow-shaped claw 60 on the insertion tube 1 side, and on the receiving tube 2 side of the arc-shaped claw 60, An interposition member 12B is provided. This interposition member 12B is the elastic part of the present invention formed of a material having elasticity. Further, the bow claw 60 has a blade portion 60b extending toward the insertion tube 1 with the same configuration as that of the first embodiment, and the surface of the blade portion 60b of the bow claw 60 is formed by the interposed member 12A. Covered. This interposing member 12A is the rust prevention portion of the present invention that performs rust prevention of the blade portion 60b. These interposition members 12A and 12B may be formed of the same type of material, or may be formed of different types of materials.

このように形成された離脱防止装置１３は、図１０（ａ）に示されるように、挿口管１に取り付けられるとともに、受口管２のフランジ２ｂに接続ボルト１８によって接続される。そして、押圧ボルト７’を挿口管１に向けて締め込むことで、弓形爪６０の刃部６０ｂを挿口管１の外周面に食い込ませる。このとき、弓形爪６０のテーパ面６０ｃと凹部４０の周縁面４０ａとに間隙が形成され、弓形爪６０は、介在部材１２Ｂの弾性変形力によって周縁面４０ａに向けて付勢されているため、弓形爪６０のテーパ面６０ｃが凹部４０の周縁面４０ａに当接するまで移動するようになる。更に、介在部材１２Ｂの弾性変形力によって弓形爪６０のテーパ面６０ｃが凹部４０の周縁面４０ａに沿って摺動するようになり、弓形爪６０の刃部６０ｂが挿口管１の外周面に積極的に食い込むようになる。したがって、押圧ボルト７’による初期の締め込みのみで弓形爪６０の刃部６０ｂが挿口管１の外周面食い込む状態が維持されるため、押圧ボルト７’は、初期の締め込み作業後に取り外しても構わない。 As shown in FIG. 10A, the separation preventing device 13 formed in this way is attached to the insertion tube 1 and is connected to the flange 2 b of the reception tube 2 by a connection bolt 18. Then, by tightening the pressing bolt 7 ′ toward the insertion tube 1, the blade portion 60 b of the arcuate claw 60 is caused to bite into the outer peripheral surface of the insertion tube 1. At this time, a gap is formed between the tapered surface 60c of the arcuate claw 60 and the peripheral surface 40a of the recess 40, and the arcuate claw 60 is biased toward the peripheral surface 40a by the elastic deformation force of the interposition member 12B. The taper surface 60c of the arcuate claw 60 moves until it contacts the peripheral surface 40a of the recess 40. Further, the taper surface 60c of the arcuate claw 60 slides along the peripheral surface 40a of the recess 40 due to the elastic deformation force of the interposition member 12B, and the blade portion 60b of the arcuate claw 60 is placed on the outer peripheral surface of the inlet tube 1. Actively eats in. Therefore, since the state in which the blade portion 60b of the arcuate claw 60 bites into the outer peripheral surface of the insertion tube 1 is maintained only by the initial tightening by the pressing bolt 7 ′, the pressing bolt 7 ′ is removed after the initial tightening operation. It doesn't matter.

次に、実施例３に係る離脱防止装置につき、図１１を参照して説明する。 Next, a separation preventing apparatus according to the third embodiment will be described with reference to FIG.

本実施例における離脱防止装置２３は、前記実施例１及び２と同様に挿口管１及び受口管２が接続されており、このように接続された両口管１，２の離脱を防止するものである。また、本実施例における押輪は、前記実施例１の構成と同一であり、弓形爪は、前記弓形爪の第１変形例の構成と同一であるため同一符号を付して重複する説明を省略する。 In the present embodiment, the detachment prevention device 23 is connected to the insertion tube 1 and the receiving tube 2 in the same manner as in the first and second embodiments, and prevents the detachment of the two-way tubes 1 and 2 thus connected. To do. The push wheel in the present embodiment is the same as the configuration of the first embodiment, and the arcuate claw is the same as the configuration of the first modification of the arcuate claw. To do.

押輪５の内周面には、弓形爪１６より若干大に形成された本発明の凹部としての弧状凹部４１が周方向に所定間隔離間して複数設けられている。この弧状凹部４１は、弓形爪１６が収納された際に弓形爪１６の側面１６ｄと対応した外側面４１ｂを備えている。また、押輪５に設けられたネジ孔には、押圧ボルト１７が挿入されている。 A plurality of arc-shaped concave portions 41 as the concave portions of the present invention, which are formed slightly larger than the arcuate claw 16, are provided on the inner peripheral surface of the press wheel 5 at predetermined intervals in the circumferential direction. The arc-shaped recess 41 includes an outer surface 41b corresponding to the side surface 16d of the arcuate claw 16 when the arcuate claw 16 is stored. A pressing bolt 17 is inserted into a screw hole provided in the press wheel 5.

この押圧ボルト１７は、先端に弓形爪１６のテーパ面１６ｃと略同一の傾斜に形成された先端部１７ａを備えている。これによれば、押圧ボルト１７を締め込むことにより、押圧ボルト１７の先端部１７ａがテーパ面１６ｃに沿って弓形爪１６を挿口管１に向けて押圧するようになっているため、両口管１，２を離脱方向へ相対移動させる外力が作用した際には、更に弓形爪１６の刃部１６ｂが挿口管１の外周面に積極的に食い込むようになり、両口管１，２の離脱が防がれる。 The pressing bolt 17 has a tip portion 17a formed at the tip thereof with substantially the same inclination as the tapered surface 16c of the arcuate claw 16. According to this, by tightening the pressing bolt 17, the tip 17 a of the pressing bolt 17 presses the arcuate claw 16 toward the insertion tube 1 along the tapered surface 16 c. When an external force that relatively moves the tubes 1 and 2 in the disengagement direction is applied, the blade portion 16b of the arcuate claw 16 further bites into the outer peripheral surface of the insertion tube 1 and the both-end tubes 1 and 2 The withdrawal is prevented.

以上、本発明の実施例を図面により説明してきたが、具体的な構成はこれら実施例に限られるものではなく、本発明の要旨を逸脱しない範囲における変更や追加があっても本発明に含まれる。 Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

例えば、前記実施例では、挿口管と受口管とが地中に埋設された既設の流体管となっているが、必ずしもこれに限らず、挿口管と受口管とを本発明の離脱防止装置によって離脱不能に接続させた後、埋設するようにしてもよいし、あるいは、地中に埋設されず地上に露出して配設されていても構わない。 For example, in the above-described embodiment, the insertion tube and the reception tube are the existing fluid tubes embedded in the ground. However, the present invention is not limited to this, and the insertion tube and the reception tube are not limited to those of the present invention. It may be embedded after being connected so as not to be detached by the separation preventing device, or may be buried on the ground without being buried in the ground.

尚、本発明の凹部、弓形爪、刃部、及び押圧手段の数量については、適宜設定されていればよく、様々な態様の離脱防止装置を形成してもよい。 In addition, about the quantity of the recessed part of this invention, an arcuate nail | claw, a blade part, and a press means, what is necessary is just to be set suitably, and you may form the removal prevention apparatus of various aspects.

１挿口管（流体管）
２受口管（流体管）
３離脱防止装置
４凹部
５押輪（離脱防止本体）
６弓形爪
６ｂ刃部
６ｃテーパ面（外周端）
７、７’ 押圧ボルト（押圧手段）
１２介在部材
１２ａ防食部
１２ｂ弾性部
１２Ａ介在部材（防食部）
１２Ｂ介在部材（弾性部）
１３、２３離脱防止装置
１４、２４凹部
１５、２５支持輪（離脱防止本体）
１６、２６弓形爪
１６ｂ、２６ｂ刃部
１６ｃテーパ面（外周端）
１７押圧ボルト（押圧手段）
２１ａ受口部（離脱防止本体）
３６、４６、５６弓形爪
４０、４４凹部
４１弧状凹部（凹部）
４５押輪（離脱防止本体）
５６ｂ、６０ｂ刃部
６０ｃテーパ面（外周端）
６０弓形爪
６１第１刃部
６２第２刃部
６６、７６弓形爪
１６１、２６１第１刃部
１６２、２６２第２刃部
３６１、４６１第１刃部
３６２、４６２第２刃部
５６１、６６１第１刃部
５６２、６６２第２刃部
７６１第１刃部
７６２第２刃部 1 Inlet tube (fluid tube)
2 receiving pipe (fluid pipe)
3 Detachment prevention device 4 Recessed part 5 Press wheel (detachment prevention body)
6 Arcuate claw 6b Blade 6c Tapered surface (outer edge)
7, 7 'pressing bolt (pressing means)
12 Interposition member 12a Corrosion prevention part 12b Elastic part 12A Interposition member (corrosion prevention part)
12B Intervening member (elastic part)
13, 23 Detachment prevention device 14, 24 Recess 15, 25 Support wheel (detachment prevention main body)
16, 26 Bow-shaped claws 16b, 26b Blade portion 16c Tapered surface (outer end)
17 Press bolt (Pressing means)
21a Receiving part (main body for preventing separation)
36, 46, 56 Arched claw 40, 44 Recess 41 Arc-shaped recess (recess)
45 Press wheel (main body for preventing separation)
56b, 60b Blade 60c Tapered surface (outer edge)
60 Arcuate claw 61 First blade part 62 Second blade part 66, 76 Arcuate claws 161, 261 First blade part 162, 262 Second blade part 361, 461 First blade part 362, 462 Second blade part 561, 661 First 1 blade part 562, 662 2nd blade part 761 1st blade part 762 2nd blade part

Claims

A detachment prevention body that is fitted on the outer peripheral surface of the fluid pipe and has a concave portion extending in the circumferential direction on the inner peripheral surface, and is housed in the concave portion, and bites into the outer peripheral surface of the fluid pipe at the inner peripheral tip portion. In a fluid tube detachment prevention device, comprising: a plurality of arcuate claws having possible blade portions; and pressing means for causing the blade portions to bite into an outer peripheral surface of the fluid tube by pressing an outer peripheral end of the arcuate claws. ,
The blade portion extends in the circumferential direction of the fluid pipe and has a substantially spiral shape extending in the tube axis direction, and a second spiral shape extending in a different direction from the first blade portion. An apparatus for preventing separation of a fluid pipe, comprising a blade part, wherein the first blade part and the second blade part are alternately arranged in a circumferential direction of the fluid pipe.

The separation preventing device according to claim 1, wherein the first blade portion and the second blade portion are provided continuously with respect to the arcuate claw.

A detachment prevention body that is fitted on the outer peripheral surface of the fluid pipe and has a concave portion extending in the circumferential direction on the inner peripheral surface, and is housed in the concave portion, and bites into the outer peripheral surface of the fluid pipe at the inner peripheral tip portion. In a fluid tube detachment prevention device, comprising: a plurality of arcuate claws having possible blade portions; and pressing means for causing the blade portions to bite into an outer peripheral surface of the fluid tube by pressing an outer peripheral end of the arcuate claws. ,
The arcuate claw has one arcuate claw having a first blade portion formed in a substantially spiral shape extending in the circumferential direction of the fluid pipe and extending in the tube axis direction, and a substantially spiral shape extending in a direction different from the first blade portion. And the other arcuate claw having the second blade portion formed on the fluid pipe, wherein the one arcuate claw and the other arcuate claw are alternately arranged in the circumferential direction of the fluid pipe. apparatus.

4. The fluid pipe detachment preventing device according to claim 1, wherein a plurality of the blade portions are provided in a pipe axis direction of the fluid pipe. 5.

The separation preventing device according to any one of claims 1 to 4, wherein a plurality of the arcuate claws are arranged along the circumferential direction at substantially the same position in the tube axis direction.

The fluid pipe detachment preventing device according to any one of claims 1 to 5, wherein an interposition member having an anticorrosion portion is provided on a surface of the blade portion.

The separation preventing device according to claim 6, wherein the interposition member includes an elastic part having elasticity extending in a gap between the arcuate claw and the inside of the recess.