WO2018093542A1 - Joint d'étanchéité retenu pour tuyaux en plastique - Google Patents

Joint d'étanchéité retenu pour tuyaux en plastique Download PDF

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Publication number
WO2018093542A1
WO2018093542A1 PCT/US2017/058286 US2017058286W WO2018093542A1 WO 2018093542 A1 WO2018093542 A1 WO 2018093542A1 US 2017058286 W US2017058286 W US 2017058286W WO 2018093542 A1 WO2018093542 A1 WO 2018093542A1
Authority
WO
WIPO (PCT)
Prior art keywords
pipe
spigot
bell
gasket
tooth
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/US2017/058286
Other languages
English (en)
Inventor
Daniel A. Copeland
Michael C. KEEL
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.)
McWane Inc
Original Assignee
McWane Inc
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
Priority claimed from US15/263,543 external-priority patent/US10436359B2/en
Priority claimed from US15/683,057 external-priority patent/US10663095B2/en
Application filed by McWane Inc filed Critical McWane Inc
Priority to CA3036588A priority Critical patent/CA3036588C/fr
Priority to MX2019002822A priority patent/MX2019002822A/es
Publication of WO2018093542A1 publication Critical patent/WO2018093542A1/fr
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
    • F16L37/0845—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 retaining members associated with the packing member
    • 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

Definitions

  • the present invention is directed to a pipe gasket and, more particularly, to a restrained pipe gasket for restraining a spigot of a first plastic pipe within a bell of a second plastic pipe, the pipe gasket including rigid locking segments configured for decreasing the force required to insert the spigot into the bell while preventing separation there between.
  • Pipe joint gaskets including anti-slip segments for preventing the separation of interconnected, telescoping metal pipes in applications where a fluid such as water for fire mains is held under high pressure are known in the art.
  • Exemplary gaskets are described in U.S. Pat. Nos. 5,295,697 and 5,464,228 in which a rubber gasket, serving as a fluid seal, includes toothed metal segments spaced around its inner perimeter. The toothed metal segments bite into the outer surface of the spigot of the inserted pipe and prevent withdrawal of the inserted pipe from a bell end of the other pipe, which can be caused by unbalanced hydrostatic or hydrodynamic forces. Hydrostatic and hydrodynamic forces that are unbalanced within a pipeline are referred to as thrust forces.
  • plastic pipes such as those formed from thermoplastic materials including polyethylene, polybutylene, polypropylene and poly(vinyl chloride) or PVC, are typically joined together by means of a bell-and-spigot gasket-sealed joint utilizing self-restrained gaskets often referred to as Rieber gaskets.
  • a Rieber gasket consists of a continuous steel band either externally or internally bonded to an elastomer annular body.
  • the Rieber gasket is locked into place within an annular groove of the bell, and the toothless, steel band functions to prevent the gasket from becoming dislodged therefrom.
  • the Rieber gasket fails however to sufficiently restrain axial separation of plastic pipes along a joint upon fluid pressurization of, or the occurrence of thrust forces within, the pipe joint at high pressure. Consequently, to restrain plastic pipes, external harness and other mechanical joint type glands must be used.
  • U.S. Patent No. 9,400,073 describes a restrained pipe seal for sealing a joint between plastic pipes.
  • the seal includes a plastic carrier member and a sealing member attached to the carrier member.
  • the plastic carrier member includes retaining inserts for gripping a spigot of one pipe and a bell of another pipe for holding the pipes together against thrust forces, the inserts including multiple spigot teeth.
  • Shortcomings of the pipe seal include both difficulty and expense related to manufacturing the seal. These shortcomings arise from requirements that the plastic carrier be made separately from the sealing member and then loaded into a rubber mold along with the retaining inserts. Further, the plastic carrier must also be of a sufficiently tough material to resist the heat of the gasket manufacturing process (vulcanizing process) which further increases the cost. Additionally, if the material of the plastic carrier is too inelastic, insertion of the pipe seal into a pipe bell may be prohibited.
  • the present invention is directed to a gasket for preventing the separation of a pipe joint formed between plastic pipes such as pipes manufactured from PVC.
  • the invention is based upon the discovery that gaskets containing toothed, metal locking segments can form seals between joined plastic pipes and prevent separation of the pipes caused by thrust forces without the metal segments destructively impinging upon the pipes.
  • the invention is further based upon the discovery that such gaskets allow for hand assembly of restrained plastic pipe joints and the retrofitting of Rieber gasket- containing plastic bells with internally restrained gaskets.
  • a pipe gasket for restraining a spigot of a first plastic pipe within a bell of a second plastic pipe, the pipe gasket including a compressible annular body and a plurality of rigid segments partially embedded within the compressible annular body. At least one of the rigid segments has an axially extending, radially inward facing, exposed surface, i.e., a surface not covered by material of the compressible annular body, defining a unitary, acutely pointed spigot tooth and including opposing lateral edges, a proximal edge, a distal edge and a flat portion that extends to and between the distal edge and the unitary spigot tooth and to and between the opposing lateral edges.
  • the unitary spigot tooth extends along the proximal edge and projects radially inward from an inner annular surface of the compressible annular body.
  • the unitary spigot tooth provides the only spigot penetrating portion of the rigid segment.
  • At least one bell tooth extends axially from an outer, embedded surface of the segment, the bell tooth being configured to engage and impinge upon the bell end of the second pipe.
  • the pipe gasket is seated into the bell, and the spigot is inserted into the bell and through an opening defined by the inward facing annular surface of the compressible annular body whereby the spigot directly contacts and slides across the flat portion of the inward facing exposed surface of the rigid segment from about the distal edge of the exposed surface to the unitary spigot tooth.
  • the exposed flat portion serves to substantially decrease the insertion force required to push the spigot into the bell and through the pipe gasket compared to present plastic pipe gaskets, such as Rieber gaskets, which include an inward facing annular surface composed entirely of a rubber. This is because rubber has a kinetic frictional coefficient with respect to plastics, in general, that is greater than that of steel or other metals.
  • the locking segment and gasket design of the present invention therefore allows for hand assembly of restrained plastic pipe joints without the need for additional machines or equipment.
  • the unitary spigot tooth impinges non-destructively upon the spigot and the at least one bell tooth impinges non-destructively upon the bell thereby locking the pipes together.
  • a pipe gasket for restraining a spigot of a first plastic pipe within a bell of a second plastic pipe, the pipe gasket including a ring fabricated from a compressible material, the ring having an inner annular surface and an outer annular outer surface, a void within the ring, a first opening extending through the inner annular surface and into the void and a restraining segment seated within the void.
  • the restraining segment includes a unitary spigot tooth extending radially inward from a proximal edge of the restraining segment and a flat portion extending distally from the unitary spigot tooth to a distal edge of the restraining segment, the flat portion being essentially flush with the inner annular surface.
  • a second opening is formed within the ring that extends through the outer annular surface and into a second void. At least one bell tooth of the restraining segment is located within or adjacent to the second opening. The second opening is configured to receive compressible material of the ring that is displaced by the engagement of the at least one bell tooth with the bell and pressing of the ring against bell.
  • a pipe gasket for restraining a spigot of a first plastic pipe within a bell of a second plastic pipe
  • the pipe gasket including a compressible body having an inner annular surface, an outer annular outer surface and a first opening in the inner annular surface, the first opening having opposing lateral edge portions, a proximal edge portion and a distal edge potion.
  • a restraining segment is partially embedded within the compressible body, the restraining segment having a first face that extends to and between the opposing lateral edge portions and to and between the proximal edge portion and the distal edge portion of the first opening.
  • the first face defines a unitary spigot tooth extending along the proximal edge portion of the first opening and includes a substantially flat portion that is flush with the inner annular surface and extends distally from the single spigot tooth to the distal edge portion of the first opening.
  • a method of restraining a spigot of a first plastic pipe within a bell of a second plastic pipe includes providing a pipe gasket including rigid locking segments, at least one of the locking segments including an acutely pointed bell tooth, an acutely pointed spigot tooth and a fiat surface extending to and between the spigot tooth and a distal edge of the at least on locking segment, and seating the pipe gasket into an annular groove of the bell.
  • the spigot is then inserted by hand, without the aid of a powered machine, into the bell and through an opening defined by the pipe gasket.
  • the pipe gasket can be used to convert a plastic pipe bell containing a self-restraining gasket, such as a Rieber gasket, wherein the gasket provides insufficient joint restraint, thus requiring the use of external harness restraints, to a plastic pipe bell including a sufficiently, internally restrained joint, thus requiring no external harness restraints.
  • a self-restraining gasket such as a Rieber gasket
  • FIG. 1 is a fragmented sectional view of a bell of a first plastic pipe containing a restrained pipe gasket in accordance with the present invention showing initial insertion of a spigot of a second plastic pipe into the bell and through the pipe gasket.
  • FIG. 2 is a fragmented sectional view of the bell end, the pipe gasket and the spigot of FIG. 1 showing the arrangement of the restraining segment following pressurization of, or the occurrence of thrust forces within, the interconnected pipes.
  • FIG. 3 is a perspective view the pipe gasket of FIG. 1 showing the placement of locking segments around its periphery.
  • FIG. 4 is a sectional view of the pipe gasket of FIG. 1.
  • FIG. 5 is a fragmented sectional view of the pipe gasket of FIG. 1.
  • FIG. 6 is a front perspective view of one of the locking segments of FIG. 1.
  • FIG. 7 is a rear perceptive view of the locking segment of FIG. 6.
  • FIG. 8 is a perspective view of a bottom of the locking segment of FIG. 6.
  • FIG. 9 is an elevation view of a lateral side of the locking segment of FIG. 6.
  • the present invention is directed to a pipe gasket that is adapted and arranged for forming a sealed and restrained joint between plastic pipes.
  • the pipe joint includes a bell end 10 of a first plastic pipe 11, a gasket 12 seated within an inner annular groove or retainer groove of bell end 10 and a spigot end 14 of a second plastic pipe 13 inserted through gasket 12, gasket 12 forming a seal between pipes 11 and 13.
  • Toothed locking segments 16 are embedded within and circumferentially arranged around gasket 12. Locking segments 16 are arranged to impinge upon pipes 1 1 and 13 upon pressurization of, or the occurrence of thrust forces within, the pipe joint thereby restraining axial movement of spigot end 14 out of bell end 10. The foregoing is accomplished without the use of a joint gasket gland, a Rieber gasket or an external harness.
  • the inner surface of bell end 10 includes an annular retainer groove defined by a front radial wall 15 and a rear radial wall 17 of the inner surface which intersect to provide the retainer groove with a substantially V-shaped or U-shaped cross-section.
  • the annular groove of bell end 10 can be formed by any means known in the art for forming bell ends in plastic pipes including extruding first plastic pipe 13 over a mandrel having a Rieber gasket disposed thereon and removing the first plastic pipe from the mandrel with the Rieber gasket located in the annular groove, for example, as described in U.S. Application Serial No. 14/817,923, the entire contents of which are incorporated herein by reference. Thereafter, the Rieber gasket is removed by hand, for example, with the aid of pry bar to provide an empty annular retainer groove.
  • Gasket 12 is positioned within the retainer groove with a front outer face 20 thereof being arranged adjacent to and, in sealing engagement with, front radial wall 15 and a rear outer face 22 thereof being arranged adjacent to and, in sealing engagement with, rear radial wall 17.
  • the gasket of the present invention can be used to retrofit existing plastic pipe bells which contain Rieber gaskets or other similar, self-restrained gaskets thereby converting the joints formed by the plastic pipe bells from internally unrestrained joints to internally restrained joints.
  • Gasket 12 is composed of an annular rubber body including a front portion having a substantially V-shaped outer surface defined by an annular front outer face 20 and an annular rear outer face 22 and a smooth inner surface defined by an annular inner face 24. Front outer face 20 and inner face 24 are joined by an annular leading face 21 which forms a front-most edge of gasket 12.
  • Annular rubber body further includes a middle portion having an L-shaped outer surface defined by an annular horizontal outer face 23 extending rearward from rear outer face 22 and an annular vertical outer face 25 extending radially inward from horizontal face 23.
  • the middle portion further includes a smooth, annular inner surface defined by inner face 24.
  • annular rubber body includes an annular lip portion 27 which extends slightly radially inward from vertical outer face 25 of the middle portion.
  • Lip portion 27 forms an annular inner surface 29 that is contiguous with inner face 24 and defines a variable circumference or diameter which progressively decreases moving from inner face 24 to a free end 31 of lip portion 27.
  • the variable diameter serves to improve sealing between the gasket and the spigot end of the second pipe since, at its smallest diameter, the diameter of annular inner surface 29 of lip portion 27 is substantially less than the diameter of annular inner face 24 of the gasket. Consequently, inner surface 29 of lip portion 27 forms a tighter seal about the spigot end than does inner face 24 portion of the gasket.
  • segments 16 Inserted into gasket 12 are rigid locking segments 16. As depicted in FIG. 3, segments 16 are spaced apart equally in a circumferential direction around the periphery of gasket 12 and firmly vulcanized into grooves or voids found within inner face 24 of gasket 12. Each groove or void is accessible through a rectangular opening formed through inner face 24 of gasket 12, each opening having opposing lateral sides, a proximal side and a distal side.
  • the number of locking segments 16 inserted into gasket 12 varies depending upon the anticipated fluid pressure at the pipe joint and the size of the plastic pipes involved. Although segments 16 are shown to be spaced apart equally, it is understood that the spacing can be unequal. For example, the segments can be grouped in tights clusters which are spaced from other tight segment clusters.
  • each segment 16 includes a rectangular shaped, inner surface 36 having a unitary, acutely pointed, spigot tooth 38 extending radially inward therefrom.
  • Inner surface 36 which is not embedded within the rubber body of gasket 12, but rather is exposed, includes opposing lateral edges 37, a distal edge 39 and a proximal edge 41.
  • Inner surface 36 includes a smooth, flat portion that is arranged flush or substantially flush with inner face 24 of gasket 12 with opposing lateral edges 37, distal edge 39 and proximal edge 41 being arranged adjacent to opposing lateral sides, distal side and proximal side, respectively, of the rectangular shaped opening through inner face 24.
  • the smooth, flat portion extends to and between the opposing lateral edges 37 and to and between the spigot tooth and the distal edge 39.
  • spigot tooth 38 is arranged to protrude radially inward from along or adjacent to proximal edge 41 of inner surface 36. It is contemplated that unitary tooth 38 may be slightly spaced apart from proximal edge 41 a short distance.
  • Each segment 16 further includes a front surface 40 that intersects flat inner surface 36 to form a forward- facing, multi-faced nose portion that extends from distal edge 39 to a top portion of the segment.
  • Front surface 40 extends adjacent to and along front outer face 20 of gasket 12.
  • Arranged radially outward of the nose portion along front outer face 40 are two rows of acutely pointed bell teeth 42 extending distally from front outer surface 40.
  • Bell teeth 42 are configured for impinging upon radial wall 15.
  • a rectangular-shaped space 43 is defined between the two rows of bell teeth 42 that is devoid of the rubber body of gasket 12. Space 43 provides a void, open to the surface of the gasket, into which the material of the annular rubber body can flow upon compression of the rubber against the bell and penetration of bell teeth 42 through the rubber.
  • each segment 16 includes a substantially L-shaped rear outer surface defined by a vertical surface 44, which extends proximally and radially inward from outer surface 40, and a horizontal surface 48, which extends proximally from vertical surface 44.
  • Horizontal surface 48 intersects the distal -most surface 50 of segment 16 which forms a portion of spigot tooth 38.
  • L-shaped surface is configured to maximize the mass and thickness of the proximal-most half of the annular rubber body of gasket 12 for improving the sealing performance of gasket 12.
  • Locking segments 16 are preferably fabricated from a metal such as steel and, more preferably, from a powdered metal such as powdered iron, powered low alloy steel or powdered alloyed steel.
  • Locking segments 16 fabricated from powdered metal or metals can be formed by powder compaction, powder forging, hot isostatic pressing, metal injection molding, electric current assisted sintering or additive manufacturing including 3-D printing, selective laser melting and electron beam melting.
  • a benefit of fabricating locking segments 16 from powdered metal is that powdered metal has lower manufacturing costs than other metal forming methods such as machining, casting or extruding/drawing.
  • the segments fabricated from powdered metal can be formed in place by introducing powdered metal into the voids formed in inner face 24 of gasket 12 and hardening or compacting the metal while the metal is contained within the voids.
  • the restrained, plastic pipe joint of the present invention is assembled by inserting spigot end 14 through an opening defined by inner surface 24 of gasket 12 by hand.
  • a throat of bell end 10 guides spigot end 14 into bell end 10 until a beveled end of spigot end 14 contacts the smooth, flat inner portions of inner surfaces 36 near distal edges 39 of the segments 16.
  • the spigot end slides along the smooth, flat portions of inner surfaces 36 of the segments 16 before contacting the spigot teeth 38.
  • spigot end 14 presses teeth 38 radially outward thereby causing segments 16 to move radially outward and compress the annular rubber body of gasket 14 between spigot end 14 and front radial wall 15 and a rear radial wall 17 of the annular retainer groove of bell end 10. This functions to prevent gasket 12 from dislodging from the retainer groove during further insertion of spigot end 14 into bell end 10, as well as form a seal between pipes 11 and 13. Since each spigot tooth 38 includes a tapered distal-edge, spigot end 14 slides across teeth 38 without the teeth impinging upon pipe 13, despite the compression of the rubber body of gasket 12.
  • spigot end 14 moves distally as the axial forces created by fluid pressurization attempt to force pipes 1 1 and 13 apart. This causes tooth 38 of each segment 16 to engage with spigot end 14 by friction or by penetrating non-destructive ly a short distance into spigot end 14. Each tooth 38 impinges upon spigot end 14 as pipe 13 moves distally since the proximal edge of each tooth 38 contacts pipe 13 at about a 90° angle.
  • segments 16 translate distally within pipe 13 towards front radial wall 15 causing teeth 42 to press through the rubber body and impinge upon front radial wall 15 of the annular retainer groove.
  • the rubber compressed by the pressing of gasket 12 against front radial wall 15 and displaced by penetration of bell teeth 42 through the rubber is caused to flow into space 43.
  • Space 43 provides a void for the displaced rubber, which occurs during joint assembly, caused by gasket compression. Space 43 allows for improved contact between the segment teeth 42 and radial wall 15. The teeth can penetrate this rubber without the aid of gap 43 if the force is high enough, but gap 43 decreases the force required for engagement between the segment and wall 15.
  • segments 16 are wedged between bell end 10 and spigot end 14 and the axial forces generated by the pressurization of the pipes are transmitted axially between teeth 38 and rows of teeth 42 and radially to and between the pipes as segments 16 are urged distally. Further, by impinging teeth 42 into front radial wall 15, radial forces caused by the wedging of segments 16 between pipes 1 1 and 13 are countered.
  • the pipe gasket of the present can be used to form a restrained seal between a bell of a metal pipe and a spigot of a plastic pipe.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gasket Seals (AREA)

Abstract

La présente invention concerne un joint d'étanchéité destiné à empêcher la séparation d'un raccord de tuyaux formé entre des tuyaux en matière plastique tels que des tuyaux en PVC. L'invention concerne un raccord de tuyaux à retenue interne comprenant une tulipe ayant une rainure annulaire sensiblement en forme de V. La rainure annulaire comprend une paroi radiale avant et une paroi radiale arrière et un joint d'étanchéité siégeant dans la rainure annulaire. Le joint d'étanchéité comprend une face radiale interne, une ouverture délimitée par la face radiale interne et une face externe radiale pourvue d'une section radiale avant adjacente à la paroi radiale avant de la rainure annulaire et d'une section radiale arrière située à proximité de la paroi radiale arrière de la rainure annulaire. Une pluralité de segments de retenue rigides dentés est au moins partiellement encastrée dans le joint d'étanchéité.
PCT/US2017/058286 2016-09-13 2017-10-25 Joint d'étanchéité retenu pour tuyaux en plastique Ceased WO2018093542A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CA3036588A CA3036588C (fr) 2017-08-22 2017-10-25 Joint d'etancheite retenu pour tuyaux en plastique
MX2019002822A MX2019002822A (es) 2017-08-22 2017-10-25 Junta restringida para tubos de plástico.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US15/263,543 US10436359B2 (en) 2016-05-11 2016-09-13 Restrained plastic pipe joint and method of making same
US15/263,543 2016-09-13
US15/683,057 US10663095B2 (en) 2016-05-11 2017-08-22 Restrained gasket for plastic pipes
US15/683,057 2017-08-22

Publications (1)

Publication Number Publication Date
WO2018093542A1 true WO2018093542A1 (fr) 2018-05-24

Family

ID=62145738

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2017/058286 Ceased WO2018093542A1 (fr) 2016-09-13 2017-10-25 Joint d'étanchéité retenu pour tuyaux en plastique

Country Status (3)

Country Link
CA (2) CA3179121C (fr)
MX (1) MX2019002822A (fr)
WO (1) WO2018093542A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050006855A1 (en) * 2000-06-08 2005-01-13 Holmes William W. Restraining gasket for mechanical joints of pipes
US20050275217A1 (en) * 2004-04-02 2005-12-15 Star Pipe Products Ltd. Mechanical joint gripping gasket
US20100090460A1 (en) * 2006-10-31 2010-04-15 Saint-Gobain Pam Tubular joint
US20110084484A1 (en) * 2009-10-12 2011-04-14 Mikhail German Self-restrained pipe joint system and method of assembly
WO2012027464A2 (fr) * 2010-08-24 2012-03-01 Mueller International, Llc. Joint statique pour joint à emboîtement autostatique de rampe parabolique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050006855A1 (en) * 2000-06-08 2005-01-13 Holmes William W. Restraining gasket for mechanical joints of pipes
US20050275217A1 (en) * 2004-04-02 2005-12-15 Star Pipe Products Ltd. Mechanical joint gripping gasket
US20100090460A1 (en) * 2006-10-31 2010-04-15 Saint-Gobain Pam Tubular joint
US20110084484A1 (en) * 2009-10-12 2011-04-14 Mikhail German Self-restrained pipe joint system and method of assembly
WO2012027464A2 (fr) * 2010-08-24 2012-03-01 Mueller International, Llc. Joint statique pour joint à emboîtement autostatique de rampe parabolique

Also Published As

Publication number Publication date
CA3036588C (fr) 2023-01-03
CA3036588A1 (fr) 2018-05-24
CA3179121C (fr) 2025-04-15
MX2019002822A (es) 2019-11-27
CA3179121A1 (fr) 2018-05-24

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