WO2014163480A1 - Mechanical pipe joint - Google Patents

Mechanical pipe joint Download PDF

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Publication number
WO2014163480A1
WO2014163480A1 PCT/MY2014/000039 MY2014000039W WO2014163480A1 WO 2014163480 A1 WO2014163480 A1 WO 2014163480A1 MY 2014000039 W MY2014000039 W MY 2014000039W WO 2014163480 A1 WO2014163480 A1 WO 2014163480A1
Authority
WO
WIPO (PCT)
Prior art keywords
pipe
section
pipe joint
wedge
central
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.)
Ceased
Application number
PCT/MY2014/000039
Other languages
French (fr)
Inventor
Sitsabasan A/L K.V. VELAUTHAM
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.)
Individual
Original Assignee
Individual
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=51658687&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2014163480(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Individual filed Critical Individual
Priority to US14/768,972 priority Critical patent/US20160003395A1/en
Priority to CA2901877A priority patent/CA2901877A1/en
Priority to EP14778129.8A priority patent/EP2981749A4/en
Priority to CN201480010170.6A priority patent/CN105393038A/en
Priority to AU2014250167A priority patent/AU2014250167A1/en
Publication of WO2014163480A1 publication Critical patent/WO2014163480A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L37/00—Couplings of the quick-acting type
    • F16L37/08—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members
    • F16L37/084—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking
    • F16L37/092—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of elements wedged between the pipe and the frusto-conical surface of the body of the connector
    • F16L37/0925—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of elements wedged between the pipe and the frusto-conical surface of the body of the connector with rings which bite into the wall of the pipe
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L21/00—Joints with sleeve or socket
    • F16L21/007—Joints with sleeve or socket clamped by a wedging action
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L21/00—Joints with sleeve or socket
    • F16L21/02—Joints with sleeve or socket with elastic sealing rings between pipe and sleeve or between pipe and socket, e.g. with rolling or other prefabricated profiled rings
    • F16L21/03—Joints with sleeve or socket with elastic sealing rings between pipe and sleeve or between pipe and socket, e.g. with rolling or other prefabricated profiled rings placed in the socket before connection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
    • F16L47/06—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics with sleeve or socket formed by or in the pipe end
    • F16L47/08—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics with sleeve or socket formed by or in the pipe end with sealing rings arranged between the outer surface of one pipe end and the inner surface of the sleeve or socket, the sealing rings being placed previously in the sleeve or socket

Definitions

  • This invention relates to mechanical pipe joints and, more particularly, to devices for joining water pipes of medium size above 63 mm.
  • joints between polyethylene water pipes must be able to withstand a pulling force of 4 tonnes for 125 mm pipes and 7 tonnes for 150 mm pipes.
  • Push-on joints have recently been developed and these, of course, make it very much simpler to make the pipe connections. Many of these push-on joints are complicated constructions, which makes them expensive. Cheaper but no less effective push-on joints would be desirable.
  • This invention provides such a joint.
  • a push-on pipe joint for connecting polyethylene water pipes comprises a hollow tubular body portion having a central parallel-sided section of internal diameter greater than that of the pipe and having a central inwardly extending pipe-stopping flange for limiting insertion of the pipe, an inwardly tapered section at each end of the central portion and a further parallel sided end section at the end of the tapered sections of diameter such as to allow insertion of the pipe into the joint until it contacts the flange; a plurality of equidistantly spaced pipe-gripping members inside the pipe joint and comprising a wedge section having one surface in sliding contact with the surface of the tapered section and having ratchet teeth on its opposite surface; means for forcing the wedge section along the surface of the tapered section to bring the ratchet teeth into contact with, and to penetrate the surface of, the pipe; and a sealing ring located in a groove towards the open end of the end section for forming a seal against the wall of a pipe inserted into the joint.
  • the wedge members are preferably formed with an integral hoop section formed of a somewhat resilient material and having a free leg attached to the wall of the central section in a holder adjacent the flange.
  • the pipe joint in this form of the invention of the invention operates as follows: when a pipe is introduced into the joint it first passes the sealing ring, which is, of course, appropriately sized. It then passes over the ratchet teeth of the pipe- gripping members without coming into contact with the teeth. On reaching the hoop section it compresses and somewhat flattens the hoop section causing the wedge section to slide over the cam surface formed by the tapered section of the joint to bring the ratchet teeth into contact with and to penetrate the outer surface of the pipe thus preventing the pipe from being removed from the joint.
  • the ratchet teeth of the pipe-gripping members are preferably formed of a harder and less resilient material than the rest of the members to ensure that the pipe is gripped as firmly as possible. In order to achieve this the ratchet teeth are preferably formed on an insert in the wedge section
  • the surface of the wedge section is preferably formed with transverse ridges, preferably with curved surfaces, to reduce the contact area between the two surfaces.
  • the number of pipe gripping members is variable but must, of course, be sufficient that the joint fulfils the requirements of the relevant Standard. It is possible to use as few as three or four but very many more can be used, as required or desired. It is necessary that a number of individual gripping members are used rather than a continuous gripping ring because there is always variation in the size and/or shape of extruded pipes caused by minor variances in manufacturing and by the use of a number of gripping members such variations can be accommodated.
  • the body of the pipe joint may be formed, from any material capable of withstanding the forces involved in usage but is preferably formed from polyethylene PE 100.
  • the gripping members may be made from a wide range of resilient materials, the main requirement being that the ratchet teeth should not be separable form the wedge section.
  • Fig. 1 is a section through the body portion of one form of pipe joint accordance with the invention
  • Fig. 2 is a view similar to that of Fig.1 but showing two gripping members mounted in position;
  • Fig. 3 is an isometric view of one form of gripping member; and Fig. 4 is a side view as in Fig. 2 showing a pipe inserted in the joint.
  • the body portion of the pipe joint comprises a hollow tubular member 1 having a parallel sided central section 2, an inwardly tapering section 3 on each end of the central section 2 and further generally parallel sided end sections 4 extending from tapering sections 3.
  • An inwardly extending flange 5 is formed centrally of section 2 and protrudes beyond the parallel sides of end sections 4.
  • Holding members 6a are positioned on either side of flange 5 and further holding members 6b are positioned at the opposed ends of central section 2. These holding members 6a and 6b hold pipe-gripping members 7 as described hereinafter with reference to Fig. 2 and 3.
  • These holding members 6a and 6b hold pipe-gripping members 7 as described hereinafter with reference to Fig. 2 and 3.
  • About halfway along the inner surfaces of end sections 4 are grooves 8 for receiving sealing rings 9 (see Fig. 4).
  • pipe-gripping members 7 comprise a hoop section 10 and an integrally formed wedge section 11.
  • Hoop section 10 is of the same height as flange 5 and its free end 12 is received in holding member 6a.
  • the other end 13 is received in holding member 6b.
  • Wedge section 11 has a lower surface 14 that lies on the inclined surface 3a of tapering section 3 and is formed with a number of transverse ribs 15 having a part circular cross-section to reduce friction between the two surfaces.
  • Wedge section 11 on its upper surface 16 is formed with an insert portion 17 having ratchet teeth 18 on its outer surface.
  • Gripping members 7, apart from insert portion 17, are formed from a material that is somewhat resilient to the extent that when pressure is applied to the peak of hoop section 10 by pushing a pipe 19 into the joint, (see Fig. 3) the hoop opens and the gripping member elongates pushing wedge section along surface 3a and causing ratchet teeth 18 to penetrate the surface of pipe 19 and prevent its removal from the pipe joint.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Joints With Sleeves (AREA)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)

Abstract

A push-on pipe joint for connecting polyethylene water pipes comprises a hollow tubular body portion (1) having a central parallel-sided section (2) of internal diameter greater than that of the pipe and having a central inwardly extending pipe-stopping flange (5) for limiting insertion of the pipe, an inwardly tapered section (3) at each end of the central portion (1) and a further parallel sided end section (4) at the end of the tapered sections (3) of diameter such as to allow insertion of the pipe into the joint until it contacts the flange (5); a plurality of equidistantly spaced pipe- gripping members (7) inside the pipe joint and comprising a wedge section (11) having one surface (14) in sliding contact with the surface of the tapered section (3) and having ratchet teeth (18) on its opposite surface; means for forcing the wedge section (11) along the surface of the tapered section (3) to bring the ratchet teeth (18) into contact with, and to penetrate the surface of, the pipe; and a sealing ring ((9) located in a groove (8) towards the open end of the end sections (4) for forming a seal against the wall of a pipe inserted in the pipe joint.

Description

MECHANICAL PIPE JOINT
This invention relates to mechanical pipe joints and, more particularly, to devices for joining water pipes of medium size above 63 mm.
BACKGROUND TO THE INVENTION
According to BS EN 12201 joints between polyethylene water pipes must be able to withstand a pulling force of 4 tonnes for 125 mm pipes and 7 tonnes for 150 mm pipes.
Various forms of pipe joints have been proposed, and are in use, that fulfil the requirements of the standard but many of these have drawbacks that make them difficult to use.
Push-on joints have recently been developed and these, of course, make it very much simpler to make the pipe connections. Many of these push-on joints are complicated constructions, which makes them expensive. Cheaper but no less effective push-on joints would be desirable.
This invention provides such a joint.
SUMMARY OF THE INVENTION
According to the invention a push-on pipe joint for connecting polyethylene water pipes comprises a hollow tubular body portion having a central parallel-sided section of internal diameter greater than that of the pipe and having a central inwardly extending pipe-stopping flange for limiting insertion of the pipe, an inwardly tapered section at each end of the central portion and a further parallel sided end section at the end of the tapered sections of diameter such as to allow insertion of the pipe into the joint until it contacts the flange; a plurality of equidistantly spaced pipe-gripping members inside the pipe joint and comprising a wedge section having one surface in sliding contact with the surface of the tapered section and having ratchet teeth on its opposite surface; means for forcing the wedge section along the surface of the tapered section to bring the ratchet teeth into contact with, and to penetrate the surface of, the pipe; and a sealing ring located in a groove towards the open end of the end section for forming a seal against the wall of a pipe inserted into the joint.
In a preferred form of the invention the wedge members are preferably formed with an integral hoop section formed of a somewhat resilient material and having a free leg attached to the wall of the central section in a holder adjacent the flange.
The pipe joint in this form of the invention of the invention operates as follows: when a pipe is introduced into the joint it first passes the sealing ring, which is, of course, appropriately sized. It then passes over the ratchet teeth of the pipe- gripping members without coming into contact with the teeth. On reaching the hoop section it compresses and somewhat flattens the hoop section causing the wedge section to slide over the cam surface formed by the tapered section of the joint to bring the ratchet teeth into contact with and to penetrate the outer surface of the pipe thus preventing the pipe from being removed from the joint. The ratchet teeth of the pipe-gripping members are preferably formed of a harder and less resilient material than the rest of the members to ensure that the pipe is gripped as firmly as possible. In order to achieve this the ratchet teeth are preferably formed on an insert in the wedge section
To ease the sliding movement of the wedge section over the cam surface on the body the surface of the wedge section is preferably formed with transverse ridges, preferably with curved surfaces, to reduce the contact area between the two surfaces.
The number of pipe gripping members is variable but must, of course, be sufficient that the joint fulfils the requirements of the relevant Standard. It is possible to use as few as three or four but very many more can be used, as required or desired. It is necessary that a number of individual gripping members are used rather than a continuous gripping ring because there is always variation in the size and/or shape of extruded pipes caused by minor variances in manufacturing and by the use of a number of gripping members such variations can be accommodated. The body of the pipe joint may be formed, from any material capable of withstanding the forces involved in usage but is preferably formed from polyethylene PE 100.
The gripping members may be made from a wide range of resilient materials, the main requirement being that the ratchet teeth should not be separable form the wedge section.
DESCRIPTION OF PREFERRED EMBODIMENT
The invention will now be described in greater detail, by way of example, with reference to the attached drawings, in which: Fig. 1 is a section through the body portion of one form of pipe joint accordance with the invention;
Fig. 2 is a view similar to that of Fig.1 but showing two gripping members mounted in position;
Fig. 3 is an isometric view of one form of gripping member; and Fig. 4 is a side view as in Fig. 2 showing a pipe inserted in the joint.
As shown in Fig.1, the body portion of the pipe joint comprises a hollow tubular member 1 having a parallel sided central section 2, an inwardly tapering section 3 on each end of the central section 2 and further generally parallel sided end sections 4 extending from tapering sections 3. An inwardly extending flange 5 is formed centrally of section 2 and protrudes beyond the parallel sides of end sections 4. Holding members 6a are positioned on either side of flange 5 and further holding members 6b are positioned at the opposed ends of central section 2. These holding members 6a and 6b hold pipe-gripping members 7 as described hereinafter with reference to Fig. 2 and 3. About halfway along the inner surfaces of end sections 4 are grooves 8 for receiving sealing rings 9 (see Fig. 4).
As shown in Figs. 3 and 4, pipe-gripping members 7 comprise a hoop section 10 and an integrally formed wedge section 11. Hoop section 10 is of the same height as flange 5 and its free end 12 is received in holding member 6a. The other end 13 is received in holding member 6b. Wedge section 11 has a lower surface 14 that lies on the inclined surface 3a of tapering section 3 and is formed with a number of transverse ribs 15 having a part circular cross-section to reduce friction between the two surfaces.
Wedge section 11 on its upper surface 16 is formed with an insert portion 17 having ratchet teeth 18 on its outer surface.
Gripping members 7, apart from insert portion 17, are formed from a material that is somewhat resilient to the extent that when pressure is applied to the peak of hoop section 10 by pushing a pipe 19 into the joint, (see Fig. 3) the hoop opens and the gripping member elongates pushing wedge section along surface 3a and causing ratchet teeth 18 to penetrate the surface of pipe 19 and prevent its removal from the pipe joint.

Claims

1. A push-on pipe joint for connecting polyethylene water pipes comprising a hollow tubular body portion (1) having a central parallel-sided section (2) of internal diameter greater than that of the pipe and having a central inwardly extending pipe-stopping flange (5) for limiting insertion of the pipe, an inwardly tapered section (3) at each end of the central portion (1) and a further parallel sided end section (4) at the end of the tapered sections (3) of diameter such as to allow insertion of the pipe into the joint until it contacts the flange (5); a plurality of equidistantly spaced pipe- gripping members (7) inside the pipe joint and comprising a wedge section (11) having one surface (14) in sliding contact with the surface of the tapered section (3) and having ratchet teeth (18) on its opposite surface; means for forcing the wedge section (11) along the surface of the tapered section (3) to bring the ratchet teeth (18) into contact with, and to penetrate the surface of, the pipe; and a sealing ring ((9) located in a groove (8) towards the open end of the end sections (4) for forming a seal against the wall of a pipe inserted in the pipe joint.
2. A pipe joint according to claimi, wherein the wedge members (11) are formed with an integral hoop section (10) formed of a somewhat resilient material and having a free leg (12) attached to the wall of the central section in a holder adjacent the flange (5).
3. A pipe joint according to claim 1 or claim 2, wherein the ratchet teeth (18) are formed on an insert in the wedge section (11).
4. A pipe joint according to any one of claims 1 to 3, wherein the sliding surface (14) of the wedge section (11) is formed with transverse (15).
5. pipe joint according to claim 4,wherein the ribs (15) have curved surfaces, to reduce the contact area between the two surfaces.
PCT/MY2014/000039 2013-04-02 2014-03-19 Mechanical pipe joint Ceased WO2014163480A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US14/768,972 US20160003395A1 (en) 2013-04-02 2014-03-19 Mechanical pipe joint
CA2901877A CA2901877A1 (en) 2013-04-02 2014-03-19 Mechanical pipe joint
EP14778129.8A EP2981749A4 (en) 2013-04-02 2014-03-19 Mechanical pipe joint
CN201480010170.6A CN105393038A (en) 2013-04-02 2014-03-19 Connector for medical lines
AU2014250167A AU2014250167A1 (en) 2013-04-02 2014-03-19 Mechanical pipe joint

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
MYPI2013001168 2013-04-02
MYPI2013001168A MY159566A (en) 2013-04-02 2013-04-02 Mechanical pipe joint

Publications (1)

Publication Number Publication Date
WO2014163480A1 true WO2014163480A1 (en) 2014-10-09

Family

ID=51658687

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/MY2014/000039 Ceased WO2014163480A1 (en) 2013-04-02 2014-03-19 Mechanical pipe joint

Country Status (7)

Country Link
US (1) US20160003395A1 (en)
EP (1) EP2981749A4 (en)
CN (1) CN105393038A (en)
AU (1) AU2014250167A1 (en)
CA (1) CA2901877A1 (en)
MY (1) MY159566A (en)
WO (1) WO2014163480A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114562619B (en) * 2022-03-25 2023-05-19 安徽萍聚德医疗科技股份有限公司 A piping system for sterile water preparation

Citations (2)

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Publication number Priority date Publication date Assignee Title
JPS6440785A (en) * 1987-08-04 1989-02-13 Matsushita Electric Works Ltd Pipe joint
US5921588A (en) * 1996-06-27 1999-07-13 Friatec Aktiengesellschaft Push-in pipe coupling

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US2017994A (en) * 1932-01-12 1935-10-22 Ferdinand J Spang Pipe joint
US2635901A (en) * 1946-12-27 1953-04-21 Alden E Osborn Joint for smooth-surfaced pipe
US2899217A (en) * 1954-12-31 1959-08-11 Henry T. Chamberlain Pipe coupling device with pressure acitvated pipe gripping means
CH396534A (en) * 1962-06-28 1965-07-31 Hawle Erwin Connection or transition piece for smooth pipes, especially plastic pipes
DE19858514C2 (en) * 1998-12-18 2001-03-22 Ludwig Frischhut Gmbh & Co Kg Socket connection with a push lock
US6505860B2 (en) * 2000-01-26 2003-01-14 Claude Trichard Connection device for conduits
KR200269760Y1 (en) * 2001-12-03 2002-03-25 김석윤 Joint For Plumbing
JP2005172218A (en) * 2003-11-21 2005-06-30 Hama International:Kk Pipe fitting
US6893051B1 (en) * 2003-12-31 2005-05-17 Join Top Co., Ltd. Pipe coupling
KR200347218Y1 (en) * 2004-01-26 2004-04-08 김석윤 Joint for Plumbing
ES2367779T3 (en) * 2004-04-28 2011-11-08 Tabuchi Co., Ltd. QUICK PUMP GASKET FOR RESIN TUBE.
RU2472057C2 (en) * 2007-11-11 2013-01-10 Плассим Фиттингс Лтд. Clamping ring for fitting
KR20090106296A (en) * 2008-04-04 2009-10-08 (주)위더스 Pipe connection
KR20090132072A (en) * 2008-06-20 2009-12-30 김승현 One Touch Pipe End Connection
KR101006370B1 (en) * 2008-07-03 2011-01-10 김광희 One-touch pipe connection with expanded pipe contour
KR20100077883A (en) * 2008-12-29 2010-07-08 주식회사 조인탑 An assembly for pressed o-ring type one touch pipe joint
EP2423554B1 (en) * 2010-08-31 2016-03-16 Geberit International AG Fitting for water pipes
JP5906485B2 (en) * 2012-01-31 2016-04-20 株式会社トヨックス Pipe connection structure

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6440785A (en) * 1987-08-04 1989-02-13 Matsushita Electric Works Ltd Pipe joint
US5921588A (en) * 1996-06-27 1999-07-13 Friatec Aktiengesellschaft Push-in pipe coupling

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP2981749A4 *

Also Published As

Publication number Publication date
US20160003395A1 (en) 2016-01-07
AU2014250167A1 (en) 2015-08-06
CN105393038A (en) 2016-03-09
CA2901877A1 (en) 2014-10-09
MY159566A (en) 2017-01-13
EP2981749A4 (en) 2016-11-16
EP2981749A1 (en) 2016-02-10

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