WO2002023076A2 - Joint adhesif pour tuyau plastique - Google Patents

Joint adhesif pour tuyau plastique Download PDF

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Publication number
WO2002023076A2
WO2002023076A2 PCT/US2001/028697 US0128697W WO0223076A2 WO 2002023076 A2 WO2002023076 A2 WO 2002023076A2 US 0128697 W US0128697 W US 0128697W WO 0223076 A2 WO0223076 A2 WO 0223076A2
Authority
WO
WIPO (PCT)
Prior art keywords
threads
male
pipe
female threads
female
Prior art date
Application number
PCT/US2001/028697
Other languages
English (en)
Other versions
WO2002023076A3 (fr
Inventor
Joe T. Minarovic
Elmont E. Hollingsworth
Original Assignee
Minarovic Joe T
Hollingsworth Elmont E
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 Minarovic Joe T, Hollingsworth Elmont E filed Critical Minarovic Joe T
Priority to AU2001290896A priority Critical patent/AU2001290896A1/en
Publication of WO2002023076A2 publication Critical patent/WO2002023076A2/fr
Priority to US10/140,539 priority patent/US7237810B2/en
Publication of WO2002023076A3 publication Critical patent/WO2002023076A3/fr

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
    • F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
    • F16L15/001—Screw-threaded joints; Forms of screw-threads for such joints with conical threads
    • 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
    • F16L37/24—Couplings of the quick-acting type in which the connection is made by inserting one member axially into the other and rotating it to a limited extent, e.g. with bayonet action
    • F16L37/244—Couplings of the quick-acting type in which the connection is made by inserting one member axially into the other and rotating it to a limited extent, e.g. with bayonet action the coupling being co-axial with the pipe
    • F16L37/2445—Couplings of the quick-acting type in which the connection is made by inserting one member axially into the other and rotating it to a limited extent, e.g. with bayonet action the coupling being co-axial with the pipe in which a male cylindrical element is introduced into a female cylindrical element, each element containing several threads axially spaced and circumferentially discontinuous which engage with each other as a result of the rotation of one of the elements

Definitions

  • the present invention generally relates to methods and systems used to attach structural members, more specifically, to a joint for connecting conduits, and particularly to a joint that may be used to provide both mechanical attachment and a complete pressure seal for polymeric (plastic) pipe.
  • conduits are used to provide various utility services, such as telephone, cable, water, waste water, and natural gas. These conduits come in a variety of sizes, shapes and materials.
  • One of the most common forms is a pipe having a circular cross-section, constructed of a polymeric (plastic) material, particularly acrylonitrile butadiene styrene, or polyvinyl chloride. These specific materials are typically used to construct pipes that are relatively rigid.
  • Electrofusion couplers overcome the adherence properties of the polyolefin compositions by being formed of the same thermoplastic material as the conduits to be joined.
  • An electrical resistance heating element within the coupler raises the temperature of the material in both the coupler and the adjoining pipe, which then flows together. Upon cooling, the material from the two parts fuses together.
  • electrofusion couplers often do not create a complete seal and the entire process must sometimes be repeated. Electrofusion couplers are also relatively expensive.
  • U.S. Patent No. 5,254,824 A more complicated technique for joining plastic pipe, using microwaves, is disclosed in U.S. Patent No. 5,254,824. That system requires a composite bonding material comprised of a plurality of coated susceptor particles suspended in a matrix. As with the electrofusion couplers, the material of the matrix is adapted to fuse with the material of the pipe at high temperatures. The material is heated by energization of the susceptor particles via, radiant microwave energy.
  • This system is very complicated, however, as it requires a special microwave cavity and power supply, both of which can be very bulky. This technique also presents safety hazard to workers who may be exposed to microwave radiation.
  • a simpler approach to joining pipes is the use of pipe threading, i.e., where one pipe (with exterior male threads) screws into the end of the second pipe (with interior female threads). While threading is an acceptable way of joining certain kinds of pipe, particularly metal pipe, it is again much less useful in joining plastic pipe. Plastic threads do not have the strength of metal threads, and are more susceptible to stripping. Also, when a straight thread is used to connect two cylinders, a deep shoulder is required to accommodate each thread (male and female), which accordingly decreases the longitudinal strength of the cylinder wall. To avoid this problem, it is necessary to alter either the inner diameter or outer diameter of one of the pipes, which may lead to the difficulties mentioned above.
  • a method of joining two pipe ends generally comprising the steps of forming a plurality of male tlireads on an end of a first pipe member, wherein the male threads have a steep taper angle, forming a plurality of female threads on an end of a second pipe member, wherein the female threads have the steep taper angle and are adapted to. engage the male threads, applying adhesive material to a selected one of the male and female threads, aligning male threads with the female threads as the end of the first pipe member is brought into contact with the end of the second pipe member, then twisting the pipe members to fully engage the male and female tlireads, and thereby spread the adhesive material across adjacent load-bearing surfaces of the threads.
  • the adhesive material is allowed to cure.
  • the invention is particularly suited for use with polymeric pipe, and the threads can either be molded into the pipe ends, cut using a computer-controlled lathe or cut with other specialty thread cutting machines.
  • the threads have multiple start locations for thread engagement.
  • the pipe ends may be twisted to achieve full engagement in less than one full relative rotation of the pipes.
  • the finished joint thereby formed provides immediate low pressure leak-tightness and immediate tensile, compressive and torsional strength.
  • Figure 1 is a perspective view of one embodiment of a male pipe end constructed in accordance with the present invention
  • Figure 2 is an elevational view of the male pipe end of Figure 1;
  • Figure 3 is a plan (axial) view of the male pipe end of Figure 1;
  • Figure 4 is a detail of Figure 2 depicting trie tapered design of the threads of the male pipe end
  • Figure 5 is a sectional view illustrating a completed joint in accordance with the teachings of the present invention.
  • Pipe 10 is cylindrical with a generally circular cross-section, and has an end 12 provided with male threading 14.
  • the hollowed interior of the pipe may be used to convey a particular fluid product, or may accommodate other conduits e.g., telecommunications lines.
  • Pipe 10 may be constructed of any durable material, preferably a rigid polymer such as polyvinyl chloride (PVC) or acrylonitrile butadiene styrene (ABS).
  • PVC polyvinyl chloride
  • ABS acrylonitrile butadiene styrene
  • the specific dimensions of pipe 10 may vary considerably, depending upon the application. For example, the outer diameter of pipe 10 might be as small as half an inch, or as large as six feet.
  • the length of pipe 10 may similarly vary, from a couple of feet to a hundred feet or more.
  • Threading 14 is tapered across the complete thickness of pipe wall 16.
  • the taper angle is relatively steep, preferably in the range of 20_-60_. In the illustrative embodiment shown in the figures, the taper is approximately 35_. With this taper, the threads are not capable of cross-threading. When assembled with a corresponding female threaded pipe end, the joint is self-centering and self- rounding.
  • Threading 14 may thereby become fully engaged with corresponding female threading with less than one relative rotation ( ⁇ 360_) of pipe 10.
  • the multiple thread sets may also be seen in Figure 2, where a single thread 20 is shaded to show its starting and ending locations. In this particular embodiment, full thread engagement may be accomplished with as little as a 30_ turn and a maximum of a 120_ turn. The 90_ difference is the rotation space between the starts of engagement.
  • the present invention uses a thread poorly adapted for a ordinary thread joint in plastic to form an adhesive joint of superior quality.
  • the torque required to loosen the thread joint is a small percentage of the tightening torque.
  • the rotation required to loosen the thread joint is very small.
  • the result of over tightening the joint is compressing the end of the pipe with the male tliread and expanding the end of the pipe with the female thread.
  • the foregoing adhesive joint design presents several advantages when compared to previous joint designs. Adding adhesive to the threads before tightening them produces a superior joint that enhances to ability of the adhesive make and seal a good joint.
  • This tapered threading provides a large surface area compared to the cross-section of the pipe itself.
  • the joint is completed with less than one twist of the pipe, such that the adhesive does not have sufficient time or distance to seize, gall or be scraped off before the joint makes up.
  • the threads need only be lightly tightened to make a satisfactory joint.
  • the male and female threads radially approach each other faster than .008 inches per inch of circumferential travel.
  • the squeeze angle or Arctangent of the rate of radial approach of the surfaces is larger than a half of a degree.
  • This angle is a function of the taper angle of the threads, thread pitch, the diameter of the pipe, and the number of thread starts.
  • the invention contemplates a squeeze angle in the range of 0.5_ to 5_. This small angle facilitates uniform application of adhesive across the load- bearing surfaces of the tlireads.
  • the threads act as a self-clamping joint while the adhesive sets. The threads provide sufficient strength to the joint so that it may be handled and installed before the adhesive sets.
  • the lack of extension beyond the pipe profile decreases the size of hole, trench or tunnel required for installation and does not impede flow of product through the pipe or restrict or the conduits that can be installed within it.
  • the adhesive is preferably non-toxic, strong and quick setting. It need not be gap-filling or crack filling. Solvent glues such as "airplane" glue, and solvent glues that dissolve part of the pipe and then cure to make a single, integral material joint between the pipes being joined may be used, but are relatively slow in their curing times. Although days may be required for complete solvent evaporation, the initial mechanical strength of the joint allows nearly immediate installation and low pressure testing to confirm basic leak-tightness. This advantage of the invention compensates for the drying time of these glues.
  • Chemical reacting glue such as epoxy, urethane or cyanoacrylate may also be used with this joint.
  • the initial mechanical strength may not be the most important feature but the self-clamping of the joint and the thin glue line contribute to a high-strength and convenient joint.
  • the adhesive is preferably placed completely arpund the periphery of the male thread with a swab, sponge or paint brush.
  • the mating thread design nominally calls for a zero gap between the threads. rl Tightening.the threads forces the gap closed. This squeezes out excess adhesive. from the joint. The flow of excess adhesive out of the joint assists and assures the even distribution of adhesive throughout the joint.
  • the small gap of the joint design minimizes the adhesive required and maximizes the strength of the adhesive bond between the two surfaces to be bonded.
  • the minimizing of the amount of adhesive used minimizes cost, minimizes exposure of adhesive to the person applying the adhesive, minimizes clean up and usually lowers the setup time of the adhesive.
  • the minimizing the amount of adhesive gap to be filled increases bond strengths and maximizes chemical and corrosion resistance of the joint,
  • FIG. 4 An exemplary thread profile is shown in detail in Figure 4.
  • the threads have a stepped appearance (frusto- triangular) in which the tips or edges 22 are sheared at the included angle.
  • the effective included angle between thread flanks is approximately 60_.
  • a complementary geometry is formed at the inner apex of a thread by landing portions 24 whose surfaces are generally parallel with a taper direction of the threading (or radiused). This geometry reduces any incomplete filling of the adhesive material in the interstices between adjacent threads.
  • the nominal pitch (distance between adjacent threads) is picked to result in three to six full threads in the wall thickness.
  • the foregoing thread specifications may be achieved using molding techniques (e.g.,. injection molding), or by cutting with a computer-controlled lathe or milling machine, or with a cam-controlled, specially-designed threading machine.
  • pipe 10 may be provided with male threading at one end, and female threading at the other end.
  • male threading at one end
  • female threading at the other end
  • the joint does not require any kind of coupling,' and can be applied to other types of pipe members besides straight, such as reducers, adapters, sex changers and caps.
  • Other alternative embodiments include variations in thread profiles, thread pitch, number of starts, taper angles, and left-handed threads.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)
  • Non-Disconnectible Joints And Screw-Threaded Joints (AREA)

Abstract

L'invention concerne un procédé de connexion de deux extrémités de tuyaux, consistant à former des filetages mâles sur une extrémité d'un premier tuyau avec un angle conique aigu, à former des filetages femelles correspondants sur une extrémité d'un second tuyau, et à appliquer un matériau adhésif sur les filetages avant de tordre les tuyaux de manière que les filetages mâles et femelles puissent s'emboîter complètement, répandant ainsi le matériau adhésif sur des surfaces de support de charge adjacentes des filetages. Les filetages comprennent de multiples emplacements d'emboîtement de manière que les extrémités des tuyaux puissent être tordues pour s'emboîter complètement en moins d'une rotation relative complète. Les filetages mâles et femelles sont formés avec un angle de compression entre les surfaces correspondantes des filetages de 0,5 à 5,0 degrés. Le joint fini permet d'obtenir une étanchéité immédiate, et une résistance immédiate à la traction, à la compression et à la torsion, sans faire saillie du profil du tuyau.
PCT/US2001/028697 2000-09-15 2001-09-14 Joint adhesif pour tuyau plastique WO2002023076A2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2001290896A AU2001290896A1 (en) 2000-09-15 2001-09-14 Plastic pipe adhesive joint
US10/140,539 US7237810B2 (en) 2000-09-15 2002-05-07 Plastic pipe adhesive joint

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US23308000P 2000-09-15 2000-09-15
US60/233,080 2000-09-15

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US10/140,539 Continuation US7237810B2 (en) 2000-09-15 2002-05-07 Plastic pipe adhesive joint

Publications (2)

Publication Number Publication Date
WO2002023076A2 true WO2002023076A2 (fr) 2002-03-21
WO2002023076A3 WO2002023076A3 (fr) 2002-06-20

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2001/028697 WO2002023076A2 (fr) 2000-09-15 2001-09-14 Joint adhesif pour tuyau plastique

Country Status (2)

Country Link
AU (1) AU2001290896A1 (fr)
WO (1) WO2002023076A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1482231A1 (fr) * 2003-05-30 2004-12-01 HILTI Aktiengesellschaft Raccord rapide

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3784235A (en) 1971-10-08 1974-01-08 Us Navy Tubular adhesive joint with snap lock
US3826521A (en) 1972-10-30 1974-07-30 P Wilhelmsen Glued replacement unit for repairing ruptured pipe
US3909045A (en) 1974-10-10 1975-09-30 Gen Electric Tubing joint for adhesive bonding
US4486650A (en) 1981-09-30 1984-12-04 Fusion Plastics Ltd. Electro-fusion fitting and control apparatus therefor
US5254824A (en) 1989-04-07 1993-10-19 Minnesota Mining And Manufacturing Company Method and article for microwave bonding of polyethylene pipe

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1645032A (en) * 1926-06-14 1927-10-11 Guiberson Corp Box and pin coupling
WO1991018733A1 (fr) * 1990-06-01 1991-12-12 A.O. Smith Corporation Procede servant a assembler des tronçons de tubes non ferreux filetes
US5362114A (en) * 1993-11-09 1994-11-08 Levingston Jerry C Pipe joint and method for forming same for threaded connection of profile pipe

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3784235A (en) 1971-10-08 1974-01-08 Us Navy Tubular adhesive joint with snap lock
US3826521A (en) 1972-10-30 1974-07-30 P Wilhelmsen Glued replacement unit for repairing ruptured pipe
US3909045A (en) 1974-10-10 1975-09-30 Gen Electric Tubing joint for adhesive bonding
US4486650A (en) 1981-09-30 1984-12-04 Fusion Plastics Ltd. Electro-fusion fitting and control apparatus therefor
US5254824A (en) 1989-04-07 1993-10-19 Minnesota Mining And Manufacturing Company Method and article for microwave bonding of polyethylene pipe

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1482231A1 (fr) * 2003-05-30 2004-12-01 HILTI Aktiengesellschaft Raccord rapide

Also Published As

Publication number Publication date
WO2002023076A3 (fr) 2002-06-20
AU2001290896A1 (en) 2002-03-26

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