JP2018179060A - Synthetic resin pipe having plasticity - Google Patents

Synthetic resin pipe having plasticity Download PDF

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JP2018179060A
JP2018179060A JP2017075947A JP2017075947A JP2018179060A JP 2018179060 A JP2018179060 A JP 2018179060A JP 2017075947 A JP2017075947 A JP 2017075947A JP 2017075947 A JP2017075947 A JP 2017075947A JP 2018179060 A JP2018179060 A JP 2018179060A
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main body
synthetic resin
pipe
outer peripheral
pipe main
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JP7038391B2 (en
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永吉　清治
Seiji Nagayoshi
清治 永吉
洋平 澤田
Yohei Sawada
洋平 澤田
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Evuc Co Ltd
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Evuc Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a synthetic resin pipe having elasticity which can be used for a long period of time without making a reinforcing protrusion which is spirally wound to an external peripheral face of a pipe main body having elasticity fracture a connecting part connected with the pipe main body due to bending stress which is generated at the bending of the pipe main body.SOLUTION: A reinforcing protrusion 2 composed of a hard synthetic resin which is spirally wound to an external peripheral face of a pipe main body 1 composed of a soft synthetic resin is formed into a triangular shape or a chevron shape in a cross section. Both side faces of a lower half of the reinforcing protrusion are bend into recessive circular shapes in a direction in which both the side faces are separated from each other toward the external peripheral face of the pipe main body 1, and formed at bent inclined faces 23, 23 for connecting bent ends of the faces to the external peripheral face of the pipe main body 1 in a tangent direction, and bending stress which is generated when bending the pipe main body 1 is dispersed and absorbed to the lower half of the reinforcing protrusion 2 as a whole without concentrating it at the end parts.SELECTED DRAWING: Figure 2

Description

本発明は軟質合成樹脂よりなる管主体の外周面に補強螺旋突条を巻着してなる可撓性を有する合成樹脂管に関する。   The present invention relates to a flexible synthetic resin pipe formed by winding a reinforcing spiral ridge around an outer peripheral surface of a pipe main body made of soft synthetic resin.

従来から、上記のような合成樹脂管としては、例えば、特許文献１に記載されているように、軟質合成樹脂よりなる管主体の外周面に、一定幅と一定厚みを有する断面矩形状の硬質合成樹脂よりなる補強突条を一定のピッチでもって螺旋状に巻着してなる耐圧合成樹脂管や、特許文献２に記載されているように、軟質合成樹脂よりなる管主体の外周面に断面半円状ないし蒲鉾状の硬質合成樹脂よりなる補強突条を一定のピッチでもって螺旋状に巻着してなる耐圧合成樹脂管が広く知られている。   Conventionally, as a synthetic resin pipe as described above, for example, as described in Patent Document 1, a rigid body with a rectangular cross section having a constant width and a constant thickness on the outer peripheral surface of a main tube made of soft synthetic resin A pressure resistant synthetic resin pipe formed by spirally winding reinforcing ridges made of synthetic resin at a constant pitch, and a cross section on the outer peripheral surface of a pipe mainly made of soft synthetic resin as described in Patent Document 2 2. Description of the Related Art A pressure-resistant synthetic resin pipe is widely known which is formed by spirally winding reinforcing ridges made of a semicircular or bowl-like hard synthetic resin at a constant pitch.

このように構成した合成樹脂管によれば、管主体の外周面に螺旋状に巻着した補強突条における隣接する突条部間に露出している管主体部から容易に屈曲が可能となって管体同士の接続等が円滑且つ正確に行え、また、補強突条によって優れた耐圧強度を発揮して偏平状に圧潰したり座屈したりする虞れがなく、断面円形状を保持して水等を円滑に流通させることができるといった利点を有する。   According to the synthetic resin pipe configured in this manner, bending can be easily performed from the pipe main portion exposed between the adjacent ridges in the reinforcing ridge spirally wound around the outer peripheral surface of the main pipe. Connection between tubes is smooth and accurate, and there is no risk of flat crushing or buckling due to the excellent compression strength due to the reinforcing ribs, and the cross-sectional circular shape is maintained. It has the advantage of being able to circulate water etc. smoothly.

特開２００８−２８１１６７号公報JP, 2008-281167, A 特開２００９−１３８７９２号公報JP, 2009-138792, A

しかしながら、上記特許文献１に記載の可撓性を有する耐圧合成樹脂管によれば、管本体の外周面に螺旋状に巻着してなる補強突条は断面矩形状に形成しているので、管主体を湾曲させると、凸円弧状に湾曲する管主体の外周面側に突設している補強突条部における管主体との連設基端部に曲げ応力が集中的に作用することになる。   However, according to the flexible pressure-resistant synthetic resin pipe described in Patent Document 1 above, since the reinforcing ridge formed by spirally winding around the outer peripheral surface of the pipe main body is formed in a rectangular shape in cross section, When the tube main body is bent, bending stress acts intensively on the base end portion of the reinforcing ridge portion projecting on the outer peripheral surface side of the tube main body curved in a convex arc shape with the pipe main body. Become.

具体的には、図６に示すように、外周面に硬質合成樹脂よりなる断面矩形状の補強突条12を螺旋状に巻着している軟質合成樹脂よりなる管主体11を湾曲させると、凸円弧状に湾曲した管主体11の外周面に突設している隣接する補強突条部12a 、12a において、管主体11の外周面に連なるこれらの補強突条部12a 、12a の対向する基端角部ａ、ａには、互いに引っ張り合う力ｘとこの力ｘに直角な管壁の厚み方向に向かう力ｙとが発生し、これらの力による曲げ応力が上記補強突条部12a の基端角部にこの補強突条部12a の基端を管主体11の外周面から引き剥がす方向に集中的に作用して管主体11を繰り返し湾曲させると、補強突条部12a が上記基端角部a から破断するといった問題点があった。   Specifically, as shown in FIG. 6, when the tube main body 11 made of a soft synthetic resin is spirally wound with a reinforcing ridge 12 having a rectangular cross section and made of a hard synthetic resin on the outer peripheral surface, In the adjacent reinforcing ridges 12a and 12a protruding from the outer peripheral surface of the pipe main body 11 curved like a convex arc, the opposing base of these reinforcing ridges 12a and 12a connected to the outer peripheral surface of the pipe main 11 The end corners a and a generate a pulling force x and a force y directed in the thickness direction of the pipe wall perpendicular to the force x, and bending stress due to these forces is the basis of the reinforcing ridge 12a. When the tube main body 11 is repeatedly bent by acting intensively on the end corner portion in the direction of peeling off the base end of the reinforcing ridge portion 12a from the outer peripheral surface of the pipe main body 11, the reinforcing ridge portion 12a becomes the above-mentioned base angle. There is a problem that it breaks from part a.

このような問題点は、上記特許文献２に記載されているように、軟質合成樹脂よりなる管主体の外周面に断面半円状ないし蒲鉾状の硬質合成樹脂よりなる補強突条を螺旋状に巻着してなる合成樹脂管において、管主体の外周面に連なる補強突条部の基端部を凹円弧状の湾曲面に形成している場合においても、管主体を湾曲させた際に、その基端部に上記曲げ応力が集中的に作用して基端部から破断する虞れがある。   As described in Patent Document 2, such a problem is caused by spiraling a reinforcing ridge made of a hard synthetic resin having a semicircular or bowl-like cross section on the outer peripheral surface of a pipe mainly made of a soft synthetic resin. In the case where the base end portion of the reinforcing ridge portion connected to the outer peripheral surface of the main body of the tube is formed into a concave arc-shaped curved surface in the synthetic resin pipe formed by winding, when the main body of the pipe is curved, The bending stress acts intensively on the proximal end, and there is a possibility that the proximal end may be broken.

本発明はこのような問題点に鑑みてなされたもので、その目的とするところは、軟質合成樹脂よりなる管主体を湾曲させた際に、この管主体の外周面に螺旋状に巻着している補強突条の基端部に上記応力が集中するのを防止して耐久性を向上させることができる合成樹脂管を提供するにある。   The present invention has been made in view of such problems, and in the case where a tube main body made of a soft synthetic resin is bent, the object is to be spirally wound around the outer peripheral surface of the main tube. It is an object of the present invention to provide a synthetic resin pipe capable of improving the durability by preventing the concentration of the stress on the base end portion of the reinforcing ridge.

上記目的を達成するために本発明の可撓性を有する合成樹脂管は、請求項１に記載したように、軟質合成樹脂よりなる管主体の外周面に硬質合成樹脂よりなる補強突条を一定のピッチでもって螺旋状に巻着してなる可撓性を有する合成樹脂管において、上記補強突条の下半部は、その両側面を管主体の外周面に向かって互いに離間する方向に凹円弧状に湾曲した湾曲傾斜面に形成してあり、その湾曲端を管主体の外周面に接線方向に接続させていることを特徴とする。   In order to achieve the above object, according to the flexible synthetic resin pipe of the present invention, as described in claim 1, a reinforcing ridge made of a hard synthetic resin is fixed on the outer peripheral surface of the pipe made of a soft synthetic resin. In the flexible synthetic resin pipe formed by spirally winding with a pitch of, the lower half portions of the reinforcing ridges are concave in the direction in which both side surfaces are separated from each other toward the outer peripheral surface of the pipe main body It is characterized in that it is formed into a curved inclined surface curved in an arc shape, and the curved end is tangentially connected to the outer peripheral surface of the pipe main body.

このように構成した可撓性を有する合成樹脂管において、請求項２に係る発明は、補強突条の下半部両側面は、補強突条の高さに相当する直径を有する仮想円の４分の１の円弧面に略等しい凹円弧状に湾曲した湾曲傾斜面に形成されていることを特徴とする。   In the flexible synthetic resin pipe configured as described above, the invention according to claim 2 is characterized in that the lower half side surfaces of the reinforcing ridge have a diameter of an imaginary circle having a diameter corresponding to the height of the reinforcing ridge. It is characterized in that it is formed in a curved inclined surface curved like a concave arc substantially equal to the arc surface of a half.

請求項３に係る発明は、管主体の両端部外周面には硬質合成樹脂からなり、外周面が平滑な円筒形状の継手部が形成されていることを特徴とする。   The invention according to claim 3 is characterized in that a cylindrical joint portion made of hard synthetic resin and having a smooth outer peripheral surface is formed on the outer peripheral surfaces of both ends of the main tube.

請求項１に係る発明によれば、軟質合成樹脂よりなる管主体の外周面に螺旋状に巻着してなる補強突条は、その下半部の両側面が管主体の外周面に向かって互いに離間する方向に凹円弧状に傾斜した湾曲傾斜面に形成され、且つ、これらの両側湾曲傾斜面の端部が管主体の外周面に接線方向に接続してなる末広がり形状に形成されているので、管主体を湾曲させた際に、凸円弧状に湾曲した管主体の外周面に発生する曲げ応力により、管主体の外周面側の補強突条部が、その末広がり状に形成されている下半部全体を管主体の湾曲形状に沿うよう湾曲変形して、曲げ応力を補強突条部における管主体の外周面に連なる端部に集中させることなく下半部全体に分散させながら吸収させることができる。   According to the invention of claim 1, the reinforcing ridge formed by spirally winding on the outer peripheral surface of the pipe main body made of soft synthetic resin has both side surfaces of the lower half portion thereof directed to the outer peripheral surface of the pipe main body It is formed in a curved inclined surface which is inclined in a concave arc shape in a direction away from each other, and is formed in an end-folded shape in which the ends of these both-side curved inclined surfaces are tangentially connected to the outer peripheral surface of the pipe main body Therefore, when the main tube is bent, the reinforcing ridges on the outer peripheral surface side of the main tube are formed in a diverging shape by the bending stress generated on the outer peripheral surface of the main tube curved in a convex arc shape. The entire lower half is bent and deformed to conform to the curved shape of the pipe main body, and the bending stress is absorbed while being dispersed throughout the lower half without concentrating on the end portion continuous with the outer peripheral surface of the pipe main body in the reinforcing ridge be able to.

従って、補強突条とこの補強突条を螺旋状に巻着している管主体の外周面との境目が曲げ応力によって破断するのを防止することができ、耐久性が向上して長期の使用に供することができる。   Therefore, it is possible to prevent the bending stress from breaking the boundary between the reinforcing rib and the outer peripheral surface of the pipe main body on which the reinforcing rib is spirally wound, thereby improving the durability and using it for a long time Can be

また、請求項２に係る発明によれば、上記補強突条の下半部両側面は、補強突条の高さに相当する直径を有する仮想円の４分の１の円弧面に略等しい凹円弧状に湾曲した湾曲傾斜面に形成されているので、管主体を屈曲させた際に、この補強突条における円弧状に湾曲した下半部両側面を管主体に連なる端部からこの湾曲面に沿って略均一に湾曲させながら上記曲げ応力を効果的に吸収することができる。   Further, according to the invention as set forth in claim 2, the lower half side surfaces of the reinforcing ridge are concaves substantially equal to a quarter circular surface of an imaginary circle having a diameter corresponding to the height of the reinforcing ridge. Since it is formed into a curved inclined surface curved in an arc shape, when the main pipe is bent, the curved surface from the end portion connecting the lower half side surface curved in the arc shape in the reinforcing ridge to the main pipe The bending stress can be effectively absorbed while being curved substantially uniformly along the

請求項３に係る発明によれば、上記軟質合成樹脂からなる管主体の両端部外周面に硬質合成樹脂からなる外周面が平滑な円筒形状の継手部を形成しているので、他の管材との接続が簡単に行えると共に、可撓性を有する管主体を自由に湾曲させながら接続すべき配管や排水口等にその継手部を正確に合致させて接続させることができる。   According to the invention as set forth in claim 3, since the cylindrical joint portion having a smooth outer peripheral surface made of hard synthetic resin is formed on the outer peripheral surfaces of both ends of the main pipe made of soft synthetic resin, The flexible pipe main body can be easily bent and the joint portion thereof can be accurately aligned and connected to a pipe, a drainage port or the like to be connected while being bent freely.

本発明合成樹脂管の一部を断面した正面図。The front view which cut a part of synthetic resin tube of the present invention. その一部の拡大縦断正面図。An enlarged vertical cross-sectional front view of part of it. 補強突条の側面の湾曲形状を説明するための縦断正面図。The longitudinal cross-sectional front view for demonstrating the curve shape of the side of a reinforcement protrusion. 管主体を湾曲させた際の凸状に湾曲した外周面側の補強突条部分の断面図。Sectional drawing of the reinforcement rib part of the outer peripheral surface side by which convex curve was carried out at the time of curving a pipe | tube main body. 管主体を湾曲させた際の凹状に湾曲した外周面側の補強突条部分の断面図。Sectional drawing of the reinforcement rib part of the concave-curved outer peripheral surface side at the time of curving a pipe | tube main body. 従来の耐圧合成樹脂管の湾曲状態を示す一部の縦断正面図。The one part vertical front view which shows the curve state of the conventional pressure | voltage resistant synthetic resin pipe.

次に、本発明の具体的な実施の形態を図面について説明すると、図１において、合成樹脂管は軟質合成樹脂よりなる管主体１の外周面に一定高さを有する補強突条２を一定のピッチでもって螺旋状に巻着してなり、管主体１の長さ方向に隣接する補強突条部2a、2a間に露出している上記管主体１の管壁部分を介して湾曲可能に形成していると共に補強突条２によって耐圧強度を付与している。なお、管主体１の外周面に対して補強突条２は融着によって一体的に巻装されている。   Next, a concrete embodiment of the present invention will be described with reference to the drawings. In FIG. 1, the synthetic resin pipe has a reinforcing rib 2 having a constant height on the outer peripheral surface of the pipe main body 1 made of soft synthetic resin. It is spirally wound with a pitch, and can be curved through the tube wall portion of the above-mentioned tube main body 1 exposed between the reinforcing ridges 2a, 2a adjacent in the longitudinal direction of the tube main body 1 In addition to the above, the reinforcing ribs 2 provide pressure resistance. The reinforcing rib 2 is integrally wound on the outer peripheral surface of the pipe main body 1 by fusion.

上記管主体１の管壁は全長に亘って一定厚みに形成されていて内外周面を滑らかな壁面に形成していると共に、管主体１の両端部外周面には、上記補強突条２を設けることなく一定厚みの硬質合成樹脂層３が層着されていて、この硬質合成樹脂層３の装着によって管主体１の両端部に外周面が滑らかな短筒形状の継手部４、４が設けられている。   The tube wall of the tube main body 1 is formed to have a constant thickness over the entire length, and the inner and outer peripheral surfaces are formed as smooth wall surfaces. The hard synthetic resin layer 3 of a certain thickness is laminated without providing, and by mounting the hard synthetic resin layer 3, short cylindrical joint parts 4 with smooth outer peripheral surfaces are provided at both ends of the pipe main body 1 It is done.

なお、管主体１は軟質の塩化ビニル樹脂や軟質のポリエチレン樹脂等の軟質合成樹脂からなり、上記補強突条２は硬質の塩化ビニル樹脂や硬質のポリエチレン樹脂等の硬質合成樹脂からなるが、管主体１と補強突条２とは同質の樹脂、例えば、管主体１を軟質の塩化ビニル樹脂より形成している場合には、補強突条２は硬質の塩化ビニル樹脂より形成されている。   The tube main body 1 is made of a soft synthetic resin such as soft vinyl chloride resin or soft polyethylene resin, and the reinforcing ridge 2 is made of a hard synthetic resin such as hard vinyl chloride resin or hard polyethylene resin. The main body 1 and the reinforcing rib 2 are made of the same resin, for example, when the pipe main body 1 is made of a soft vinyl chloride resin, the reinforcing rib 2 is made of a hard vinyl chloride resin.

上記硬質の合成樹脂よりなる補強突条２は、図２に示すように、一定高さを有する断面三角形状ないしは山形状に形成されてあり、管主体１の外周面に密着している底面側を下端21とし、管主体１から高さ方向に突出している突出端、即ち、頂面側を上端22とした場合、この補強突条２の下半部における両側面は、補強突条２の高さの中程部分から下端に向かって互いに離間する方向に凹円弧状に湾曲した湾曲傾斜面23、23に形成されてあり、この湾曲傾斜面23、23の湾曲下端（先端）を管主体１の外周面に対して接線方向に接続させている。従って、補強突条２の下半部の両側面は下端に向かって末広がり状に傾斜している。   As shown in FIG. 2, the reinforcing ridge 2 made of hard synthetic resin is formed in a triangular shape or a mountain shape in cross section having a certain height, and is on the bottom side in close contact with the outer peripheral surface of the pipe main body 1. Is the lower end 21 and the projecting end projecting in the height direction from the pipe main body 1, that is, when the top surface side is the upper end 22, both side surfaces of the lower half of the reinforcing ridge 2 It is formed in curved inclined surfaces 23 and 23 which are curved in a concave arc shape in a direction separating away from each other from the middle part to the lower end of the height, and the curved lower ends (tips) of the curved inclined surfaces 23 and 23 It is connected to the outer peripheral surface of 1 in the tangential direction. Therefore, both side surfaces of the lower half of the reinforcing ridge 2 are inclined in a diverging manner toward the lower end.

上記補強突条２の下半部における上記両側湾曲傾斜面23、23の具体的な湾曲形状は、図３に示すように、直径が補強突条２の高さに略等しい仮想円30を、その下端が管主体１の外周面に接線方向に連なっている補強突条２の下端上に位置させた状態となるように設けた場合、補強突条２の下半部における側面がこの仮想円30の４分の１の円弧面に略等しい凹円弧状に湾曲した湾曲傾斜面23に形成されている。   The specific curved shapes of the both side curved inclined surfaces 23 and 23 in the lower half of the reinforcing ridge 2 are, as shown in FIG. 3, an imaginary circle 30 whose diameter is substantially equal to the height of the reinforcing ridge 2 When the lower end of the reinforcing rib 2 is disposed on the lower end of the reinforcing rib 2 connected in a tangential direction to the outer peripheral surface of the pipe main body 1, the side surface of the lower half of the reinforcing rib 2 is this virtual circle It is formed in a curved inclined surface 23 which is curved in a concave arc shape substantially equal to a quarter arc surface of thirty.

補強突条２の上半部は、管主体１の外周面に密着している補強突条２の下端面（底面）の幅の１／３〜１〜４程度の幅に形成されこの上半部の両側面における下端は、下半部の上端に面一状に連なっていると共に、上端に向かって僅かに幅狭くなるように傾斜してあり、上端面は凸円弧状の湾曲面に形成されている。   The upper half portion of the reinforcing rib 2 is formed to have a width of about 1/3 to 1 to 4 of the width of the lower end surface (bottom surface) of the reinforcing rib 2 in close contact with the outer peripheral surface of the pipe main body 1 The lower ends of both sides of the part are flush with the upper end of the lower half and are inclined so as to narrow slightly toward the upper end, and the upper end face is formed into a convex arc-shaped curved surface It is done.

また、管主体１の両端部は、上述したように、この両端部外周面に上記補強突条２を設けることなく、補強突条２と同じ硬質合成樹脂によって補強突条２と同一外径で外周面が平滑な円筒形状の剛直な継手部４、４に形成されている。   Further, as described above, both ends of the pipe main body 1 have the same outer diameter as the reinforcing rib 2 by the same hard synthetic resin as the reinforcing rib 2 without providing the reinforcing rib 2 on the outer peripheral surface of the both ends. It is formed in the cylindrical rigid joint parts 4 and 4 whose outer peripheral surface is smooth.

上記のように構成した合成樹脂管は、軟質合成樹脂よりなる管主体１の外周面に硬質合成樹脂よりなる補強突条２を一定のピッチでもって螺旋状に巻着しているので、この補強突条２によって優れた耐圧強度を発揮して圧潰や座屈を生じ難く、且つ、断面円形状に保持しながら水等を円滑に流通させることができる。   The synthetic resin pipe constructed as described above has the reinforcing ribs 2 made of hard synthetic resin spirally wound on the outer peripheral surface of the pipe main body 1 made of soft synthetic resin at a constant pitch. The protrusion 2 exerts excellent pressure resistance so that crushing or buckling is unlikely to occur, and water and the like can be smoothly circulated while being held in a circular cross-sectional shape.

また、管主体１が隣接する補強突条部2a、2a間に露出している部分から容易に湾曲することができる。   Also, the pipe main body 1 can be easily bent from the portion exposed between the adjacent reinforcing ridges 2a, 2a.

この際、補強突条２の下半部は、その両側面が管主体の外周面に向かって互いに離間する方向に凹円弧状に傾斜した湾曲傾斜面23、23に形成され、且つ、これらの両側湾曲傾斜面23、23の下端が管主体の外周面に接線方向に接続してなる末広がり形状に形成されているので、管主体１を湾曲させると、凸円弧状に湾曲する管主体１の外周面においては、図４に示すように、補強突条２の下半部がその湾曲傾斜面23、23を管主体１の湾曲形状に沿う方向に湾曲変形させながら下半部全体が幅方向に圧縮して曲げ応力を補強突条２の両側端部に集中させることなくこの下半部に分散、吸収させることができる。   Under the present circumstances, the lower half part of the reinforcement protrusion 2 is formed in the curved inclined surfaces 23 and 23 which inclined in concave circular arc shape in the direction which the both sides | surfaces mutually mutually separate toward the outer peripheral surface of a pipe main body Since the lower ends of the both side curved inclined surfaces 23, 23 are formed in a diverging shape in which the lower end of the both sides is connected in the tangential direction to the outer peripheral surface of the pipe main body, when the pipe main body 1 is curved, On the outer peripheral surface, as shown in FIG. 4, the lower half of the reinforcing ridge 2 bends the curved inclined surfaces 23, 23 in the direction along the curved shape of the pipe main body 1 while the entire lower half is in the width direction Can be dispersed and absorbed in the lower half without concentrating the bending stress on both side ends of the reinforcing ridge 2.

さらに、管主体１を上記湾曲方向とは逆方向に湾曲させてその外周面を図５に示すように凹円弧状に湾曲させると、補強突条２の下半部がその湾曲傾斜面23、23を管主体１の湾曲形状に沿うように曲率半径が小さくなる方向に湾曲変形しながら下半部全体を幅方向に拡げて曲げ応力を吸収し、管主体１の外周面と補強突条２との連接部分に破断などを生じせることなく管主体１を大きく且つ円滑に湾曲させることができる。   Furthermore, when the tube main body 1 is curved in the direction opposite to the bending direction and the outer peripheral surface thereof is curved in a concave arc shape as shown in FIG. The entire lower half portion is expanded in the width direction to absorb bending stress while curving and deforming in a direction in which the radius of curvature becomes smaller along the curved shape of the pipe main body 1, and the outer peripheral surface of the pipe main body 1 and the reinforcing ridge 2 The pipe main body 1 can be curved large and smoothly without causing breakage or the like at the joint portion between the two.

１ 管主体
２ 補強突条
23 湾曲傾斜面
４ 継手部 1 Pipe main body 2 Reinforcing ridge
23 Curved slope 4 Joint

Claims (3)

軟質合成樹脂よりなる管主体の外周面に硬質合成樹脂よりなる補強突条を一定のピッチでもって螺旋状に巻着してなる可撓性を有する合成樹脂管において、上記補強突条の下半部は、その両側面を管主体の外周面に向かって互いに離間する方向に凹円弧状に湾曲した湾曲傾斜面に形成してあり、その湾曲端を管主体の外周面に接線方向に接続させていることを特徴とする可撓性を有する合成樹脂管。   A flexible synthetic resin pipe formed by spirally winding reinforcing ribs made of hard synthetic resin at a constant pitch on the outer peripheral surface of a pipe mainly made of soft synthetic resin, the lower half of the above-mentioned reinforcing ribs The part is formed in a curved inclined surface curved in a concave arc shape in a direction in which both side surfaces are separated from each other toward the outer peripheral surface of the pipe main body, and the curved end is tangentially connected to the outer peripheral surface of the pipe main body What is claimed is: 1. A flexible synthetic resin pipe characterized in that 補強突条の下半部両側面は、補強突条の高さに相当する直径を有する仮想円の４分の１の円弧面に略等しい凹円弧状に湾曲した湾曲傾斜面に形成されていることを特徴とする請求項１に記載の可撓性を有する合成樹脂管。   The lower half side surfaces of the reinforcing ridge are formed in a curved inclined surface curved like a concave arc substantially equal to a quarter circular arc surface of a virtual circle having a diameter corresponding to the height of the reinforcing ridge The flexible synthetic resin pipe according to claim 1, characterized in that 管主体の両端部外周面には硬質合成樹脂からなり、外周面が平滑な円筒形状の継手部が形成されていることを特徴とする請求項１に記載の可撓性を有する合成樹脂管。   The flexible synthetic resin pipe according to claim 1, wherein a cylindrical joint portion made of hard synthetic resin and having a smooth outer peripheral surface is formed on the outer peripheral surface of both ends of the pipe main body.
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Citations (5)

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JPS5288017U (en) * 1975-12-26 1977-07-01
JPS52138570A (en) * 1976-05-14 1977-11-18 Shirou Kanao Device for making cylindrical object
JP2003314756A (en) * 2002-04-25 2003-11-06 Kurashiki Kako Co Ltd Base isolation pipe joint
JP2005155751A (en) * 2003-11-25 2005-06-16 Kanaflex Corporation Flexible hose
JP2009014061A (en) * 2007-07-03 2009-01-22 Evuc Kk Pipe for synthetic resin joint and its manufacturing method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000291845A (en) 1999-04-13 2000-10-20 Ube Cycon Ltd Pipe
JP2007100837A (en) 2005-10-04 2007-04-19 Kanaflex Corporation Pressure-proof hose and its manufacturing method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5288017U (en) * 1975-12-26 1977-07-01
JPS52138570A (en) * 1976-05-14 1977-11-18 Shirou Kanao Device for making cylindrical object
JP2003314756A (en) * 2002-04-25 2003-11-06 Kurashiki Kako Co Ltd Base isolation pipe joint
JP2005155751A (en) * 2003-11-25 2005-06-16 Kanaflex Corporation Flexible hose
JP2009014061A (en) * 2007-07-03 2009-01-22 Evuc Kk Pipe for synthetic resin joint and its manufacturing method

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