JPH02130129A - プラスチック管の融着継手 - Google Patents

プラスチック管の融着継手

Info

Publication number
JPH02130129A
JPH02130129A JP63285523A JP28552388A JPH02130129A JP H02130129 A JPH02130129 A JP H02130129A JP 63285523 A JP63285523 A JP 63285523A JP 28552388 A JP28552388 A JP 28552388A JP H02130129 A JPH02130129 A JP H02130129A
Authority
JP
Japan
Prior art keywords
tube
stress concentration
pipe
groove
socket
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP63285523A
Other languages
English (en)
Other versions
JP2864507B2 (ja
Inventor
Takashi Nakano
隆 中野
Shiro Ariga
有賀　史朗
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Engineering Corp
Original Assignee
NKK Corp
Nippon Kokan Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NKK Corp, Nippon Kokan Ltd filed Critical NKK Corp
Priority to JP63285523A priority Critical patent/JP2864507B2/ja
Publication of JPH02130129A publication Critical patent/JPH02130129A/ja
Application granted granted Critical
Publication of JP2864507B2 publication Critical patent/JP2864507B2/ja
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3404—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint
    • B29C65/342—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint comprising at least a single wire, e.g. in the form of a winding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1222—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a lapped joint-segment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1224—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a butt joint-segment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
    • B29C66/131—Single flanged joints, i.e. one of the parts to be joined being rigid and flanged in the joint area
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5229—Joining tubular articles involving the use of a socket
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5229—Joining tubular articles involving the use of a socket
    • B29C66/52291—Joining tubular articles involving the use of a socket said socket comprising a stop
    • B29C66/52292—Joining tubular articles involving the use of a socket said socket comprising a stop said stop being internal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5229—Joining tubular articles involving the use of a socket
    • B29C66/52296—Joining tubular articles involving the use of a socket said socket comprising sealing elements, e.g. gaskets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3468—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the means for supplying heat to said heated elements which remain in the join, e.g. special electrical connectors of windings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3472—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the composition of the heated elements which remain in the joint
    • B29C65/3476—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the composition of the heated elements which remain in the joint being metallic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Branch Pipes, Bends, And The Like (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。

Description

【発明の詳細な説明】 ［産業上の利用分野］ この発明は、ポリエチレン管、ポリブテン管等のプラス
チック管の融着継手構造に関するものである。
［従来の技術］ 従来からポリエチレン管の接着方法の１つとして、熱融
着継手方式、通称ＥＦＦ　（エレクトロフユージョンフ
ィティング）方式がある。例えばソケットにより管を接
続する場合、第５図に示すように、ソケット２の内面２
ａ近くに電熱線３を周方向にスパイラル状に埋設してお
き、このソケット２に被接続管１を差し込んで、ターミ
ナル３ａから電熱線３に通電してジュール熱を発生させ
、この熱でソケット２の内面２ａ及び被接続管１の外面
１ａを溶融させて接合する。また、管に分岐部を設ける
場合には、第６図に示すように、サドル状本体部７に分
岐部８を突設した分岐サドル６の本体部内面７ａ近くに
、電熱線９を分岐部８を中心にしてスパイラル状に埋設
しておいて、」−記と同様にして、サドル６を管１に押
圧融着して分岐部を形成し、最後に分岐穴１ｃをあけて
いる。
［解決しようとする課題］ しかし、ソケット２に管１を差し込んで接合ｌまた場合
、第５図に示すように、ソケット２の内面２ａと管１の
端面１ｂによるコーナー部Ｃが形成される。また、管端
部に未融着部が残った場合には、ここにスリットが形成
される。そして、管１に内圧や軸力が付加されると、こ
のコーナー部Ｃやスリット部に応力集中が生じ、長期間
の使用を考えると、プラスチック特有のクリープ現象に
ょって、この部分から割れが生ずる危険がある。また、
電熱線３（銅、その他）自体はポリエチレン樹脂との接
着性が悪いため、上記の割れがこの電熱線埋め込み部に
つながると、割れがそれ以上進行しなくても、流体が割
れから電熱線を伝わって漏洩する危険が多い。一方、管
１にサドル６を接着した場合にも、第６図に示すように
、サドル６の分岐部８の穴８ａの端部と管１との融着部
にコーナー部Ｃが形成され、また、電熱線９の最も内側
の位置は施工上穴８ａの外周から若干離れているので、
この部に未融着部が残り、スリット部が形成され、上記
と同様な問題が生ずる。
この発明は上記のような問題点を解消することを課題と
するものである。
［課題を解決するための手段］ この発明のプラスチック管の融着継手構造は、継手部材
の被接続管との融着接続端部に、応力集中部となるコー
ナー部が形成されないようににするため、応力集中を軽
減する断面円弧状の溝を設けると共に、上記溝内にＯリ
ングを装着したことを特長とするものである。
［作用］ 継手部材の被接続管との融着接続端部に、応力集中部と
なるコーナー部が形成されないようにするため、応力集
中を軽減する断面円弧状の溝を設けた構成により、従来
問題になっていた応力集中の問題を解消することができ
る。また、溝内にＯリングを装着したので、シール性（
気密性能）を向上させることができる。
［実施例］ 以下、本発明の１実施例を継手部材１０としてのソケッ
ト１１により管を接続する場合について第１〜２図によ
り説明する。
ソケット１１の内面１１ａの、被接続管１の差し込み融
着端部に位置して、応力集中を軽減すると共に、Ｏリン
グ１３の装着保持部となる断面円弧状の溝１２が形成さ
れている。この溝１２の曲率半径は８〜１０關となって
いる。そして、溝１２にＯリング１３を装着し、管１を
差込んで、第２図に示す状態にしてから、ソケット１１
を従来と同様にして管１に融着する。管１の端部１ｂと
ソケット内面１１ａとの間にコーナー部が形成されず、
またスリット部も形成されないので、この部分での応力
集中が大幅に軽減される。即ち、従来の応力集中係数２
．５〜３が、１．２〜１．５に軽減される。その上、溝
〕２にＯリング１３が装着されているので、電熱線３に
沿っての流体の漏洩が防ＩＩ−されるので、シール性を
向上させることができる。
次に、継手部・材１０としての分岐サドル１６を管１に
融着して分岐部を形成する場合について、第３〜４図よ
り説明する。
サドル１６の分岐部１８部の穴１８ａの管１との融着接
続端部に、応力集中を軽減すると共にＯリングの装青部
となる溝１９が形成されている。
そして、溝１９にＯリング２０を装着し、管１に押圧し
て、第４図に示す状態にしてから、サドル１６を従来と
同様にして管１に融着する。分岐部の穴１８ａの端部と
管１のとの間にコーナー部が形成されず、この間に集中
応力を軽減する溝１９があるから、スリット部も形成さ
れないので、この部分での応力集中が大幅に軽減される
。なお、Ｏリング２０により上記例の場合と同様の効果
を得ることができる。
［発明の効果コ この発明のプラスチック管の融着継手構造は、上記のよ
うなもので、継手部材の被接続管との融着接続部での集
中応力を軽減することができる。
また、融る接続部での、シール性（気密性能）を向上さ
せることができる。
【図面の簡単な説明】
第１図及び第２図は本発明の継手構造の１実施例を示す
ソケットの縦断面図と被接続管に融着された状態の縦断
面図。第３図及び第４図は他の１実施例としての分岐サ
ドルの縦断面図と被接続管に融着された状態の縦断面図
。第５図は従来のソケットが被接続管に融着された状態
の縦断面図、第６図は分岐サドルが被接続管に融着され
た状態の管軸方向の縦断面図である。 １・・・被接続管　１０・・・継手部材　１１・・・ソ
ケソト ６・・・分岐サドル １２、 ９・・・断面円弧状 の溝 １３、 Ｏ・・・０ リング

Claims (1)

    【特許請求の範囲】
  1. 　継手部材の被接続管との融着接続端部に、応力集中部
    となるコーナー部が形成されないようにするために、応
    力集中を軽減する断面円弧状の溝を設けると共に、上記
    溝内にＯリングを装着したことを特徴とするプラスチッ
    ク管の融着継手構造。
JP63285523A 1988-11-11 1988-11-11 プラスチック管の融着継手 Expired - Fee Related JP2864507B2 (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63285523A JP2864507B2 (ja) 1988-11-11 1988-11-11 プラスチック管の融着継手

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63285523A JP2864507B2 (ja) 1988-11-11 1988-11-11 プラスチック管の融着継手

Publications (2)

Publication Number Publication Date
JPH02130129A true JPH02130129A (ja) 1990-05-18
JP2864507B2 JP2864507B2 (ja) 1999-03-03

Family

ID=17692632

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63285523A Expired - Fee Related JP2864507B2 (ja) 1988-11-11 1988-11-11 プラスチック管の融着継手

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2555583A (en) * 2016-10-28 2018-05-09 Peak Pipe Systems Ltd A pipe

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5521232A (en) * 1978-07-31 1980-02-15 Mitsubishi Plastics Ind Ltd Hot wire welded joint of polyolefin resin pipe

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5521232A (en) * 1978-07-31 1980-02-15 Mitsubishi Plastics Ind Ltd Hot wire welded joint of polyolefin resin pipe

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2555583A (en) * 2016-10-28 2018-05-09 Peak Pipe Systems Ltd A pipe

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