WO1998054504A1 - Anneau de prise et extremite femelle englobant un anneau de prise - Google Patents

Anneau de prise et extremite femelle englobant un anneau de prise Download PDF

Info

Publication number
WO1998054504A1
WO1998054504A1 PCT/GB1998/001533 GB9801533W WO9854504A1 WO 1998054504 A1 WO1998054504 A1 WO 1998054504A1 GB 9801533 W GB9801533 W GB 9801533W WO 9854504 A1 WO9854504 A1 WO 9854504A1
Authority
WO
WIPO (PCT)
Prior art keywords
grab ring
spigot
grab
socket
fingers
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/GB1998/001533
Other languages
English (en)
Inventor
Carol Dalton
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.)
Hepworth Building Products Ltd
Original Assignee
Hepworth Building Products 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 Hepworth Building Products Ltd filed Critical Hepworth Building Products Ltd
Priority to AU76647/98A priority Critical patent/AU7664798A/en
Publication of WO1998054504A1 publication Critical patent/WO1998054504A1/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
    • F16L37/091—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 a ring provided with teeth or fingers
    • 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 invention relates to a grab ring and a pipe socket incorporating a grab ring. More particularly, but not exclusively, the invention relates to a grab ring and joint system for use in a push-fit pipe fitting.
  • Such fittings are commonly used in various plumbing applications and have the advantage that few or no tools are required to form a joint between the fitting and the pipe spigot, which is received in a socket provided on the fitting.
  • Such fittings are generally well-known.
  • FIG. 5 of the accompanying drawings shows a partial sectional view through a known fitting and pipe spigot, together forming a joint.
  • a pipe spigot 10 is inserted into the socket 12 in the direction of the arrow I until an end-stop (not shown) is reached.
  • a gripping part 14 which typically comprises a contracting grab ring around the pipe 10 engages the pipe, for example by way of radial tooth 16. If a destructive axial force Fr is applied to the pipe 10 and tends to urge the pipe out of the socket, a frusto-conical camming surface 20 on the gripping part 14 co-operates with a complementary camming surface 18 situated in the mouth of the socket.
  • An alternative form of grab ring includes a generally plastics ring in which metal teeth are embedded. Such a grab ring is employed in a coupling disclosed in WO 97/03314.
  • a grab ring of the type shown in WO 97/03314 can solve the problems associated with metal grab rings. However, it is desirable to provide a grab ring that is less susceptible to mechanical failure.
  • the first aspect of the present invention sets out to provide such a grab ring.
  • Conventional grab rings whether made from plastics, metal or a combination of the two must not only securely retain a pipe spigot within the socket under axial loading, but also admit the pipe spigot into the socket with relative ease, upon insertion.
  • the present invention also sets out to provide a grab ring which particularly facilitates this.
  • a grab ring for securing a spigot within a socket;
  • the grab ring comprising a substantially annular body portion formed from a first material and a resistance member for resisting axial movement of a spigot located coaxially within the body portion in one direction, whilst allowing axial movement of said spigot in a second, opposite axial direction, the said resistance member being embedded in the said body portion and formed from metal;
  • the said resistance member when viewed in section, has an elongate portion which has a longitudinal axis that is aligned with a path along which the grab ring disperses force when it resists the axial withdrawal of a spigot from a socket during use.
  • the elongate portion is inclined at an angle of from 30° to 40° with the axis of the grab ring.
  • the metal portion may be provided with an enlarged force-dispersing surface which faces generally in the direction of the said force dispersion path.
  • the resistance member may include a transverse flange in a region thereof which is located at an end thereof which is opposite to a spigot-addressing end thereof.
  • the flange may be defined by a portion of the resistance member which is bent through an angle in the said end region. The angle may be 90° to prevent the generation of forces which could detach the resistance member from the body portion. Other angles are possible but increase the reliance of a bond between the resistance member and the body portion.
  • the grab ring may comprise a radially outer contact region, for abutting a radially inner surface of a socket, which contact region defines the said path of force dispersion.
  • the path of force dispersion is determined by the relative positions of the two contact points, one where the metal portion contacts the pipe and the other where the radially outer contact region abuts the radially inner surface of a socket.
  • the body portion of the grab ring may be defined by an annular support ring provided with a plurality of circumferentially spaced axially extending fingers. One or more of the fingers may be provided with a respective resistance member.
  • a grab ring for securing a spigot within a socket
  • the grab ring comprising a body portion formed from an annular support ring and a plurality of integral, circumferentially spaced axially extending fingers formed upon the support ring and adapted to flex, in a radial direction, about their junctions with the support ring; wherein the distal ends of the fingers together define a mouth for receiving a spigot, and each of the fingers, in cross- section, has a convex radially inner surface in the region of the said mouth, the said convex surfaces causing the mouth diameter to increase, at an increasing rate, with distance from an axially inner position to an axially outer position.
  • Such an arrangement is particularly advantageous, because the curved radially inner surfaces of the fingers present a greater angle with the axis at an axially outer position, than they do at an axially inner position. This causes the radial force needed to flex the fingers to reduce as the pipe spigot moves into the grab ring. As a consequence of this, during insertion, it is initially difficult for the spigot to flex the fingers, but this becomes easier as the spigot is inserted. Hence, the fingers initially centre the spigot within the mouth of the grab ring and then allow it to be inserted. This greatly facilitates spigot insertion, reduces risk of damage to both the grab ring and the pipe spigot and serves to ensure true and even radial loading of the spigot, which ensures a good axial load resistance.
  • the invention also provides a socket comprising a mouth for receiving a spigot and a grab ring for securing a spigot within the said mouth, the grab ring having the features of the first or second aspect of the invention set out above.
  • Figure 1- is a perspective view of a grab ring in accordance with the invention.
  • Figure 2 is a cross-section through the grab ring of Figure 1;
  • Figure 3 is a plan view of the grab ring of Figures 1 and 2;
  • Figure 4 is a part axial section showing the grab ring of Figures 1 to 3 in use in conjunction with a socket and a spigot;
  • Figure 5 is a partial schematic sectional view of a known fitting.
  • the grab ring 14 comprises an annular support ring 2 integrally formed with six axially extending fingers 4.
  • Each of the fingers 4 is capable of radial flexion about its junction with the support ring 2.
  • the support ring is formed from a plastics material which may be, for example, PNDF or polysulfone.
  • Each of the fingers 4 is provided with a metal resistance member 16, which is generally directed radially inwardly for interaction with a radially outer surface of a pipe spigot, such as shown in Figure 4.
  • each finger 4 has a convex radially outer surface 20 and a convex radially inner surface 30 in an end region which is distal relative to the support ring 2.
  • the convex radially outer portion 20 is adapted to cam against a radially inwardly directed surface 18 of a socket mouth 12, as described generally above in relation to Figure 5.
  • the radially inner convex surface 30 serves to assist insertion of the pipe spigot into the grab ring 14.
  • the stiffness of each finger 4 is sufficiently large that the radial force needed to flex it significantly cannot be generated by a spigot end pushing against the axially outer part of the radially inner convex surface 30 (to the left of Figure 2) because the lead-in angle at this point is relatively large.
  • the fingers 4 initially resist radial deflection and direct the spigot into axial alignment with the grab ring.
  • the radially outward forces on the fingers increase because at this axially inner part of the radially inner convex surfaces 30, the lead-in angle is much smaller.
  • the higher forces are then sufficient to flex the fingers 4 apart in order to allow the spigot to enter.
  • This effect can be controlled by adjusting the flexibility of the fingers 4 in the radial direction (by selection of appropriate materials, or finger thickness, for example). Such adjustment will determine the axial point at which the fingers will admit a spigot of a given diameter being inserted with a given force.
  • the teeth 15 of the grab ring are defined by the metal resistance members 16.
  • the resistance members take the form of metal inserts which have a cross-sectional profile which is defined by a straight elongate portion 17 and a radial portion 19.
  • the straight portion 17 has its longitudinal axis aligned with the direction in which a force F is transmitted into the grab wedge under axial tension.
  • the distribution of these forces can- be understood by reference to Figure 4 in which a pipe spigot 10 is subjected to an axial force W which tends to urge the pipe spigot 10 out of the socket 12.
  • the tooth 15 of the resistance member 16 exerts a biting force B into the spigot and the withdrawal of the spigot exerts a force F in the grab ring.
  • the metal insert 16 comprises a lateral portion 19 which is formed by bending an end portion of the resistance member 16.
  • the lateral portion 19 extends generally along a cross-sectional axis which is at an angle ⁇ relative to the line of action of the forces F and B.
  • ⁇ 90°, although other angles are possible.
  • the resistance member 16 can disperse the force F acting through it over a much wider area and thereby reduce the risk of the metal insert 16 moving along the direction of the force F within the finger 4 very significantly.
  • Other forms can be applied to this end of the resistance member with similar effect, providing they have the effect of enlarging the force-dispersing area.
  • the end of the resistance member could be turned through substantially 360° to define a bead.
  • a lateral flange could project on either side of the elongate portion to define a cruciform arrangement.
  • the illustrated embodiment has the advantage of providing the desired effect while being relatively simple to manufacture.
  • the elongate portion 17 of each metal insert is aligned at an angle ⁇ to the longitudinal axis of the grab ring.
  • An angle of 30° has been found empirically to be the best angle of inclination of the inserts. The angle provides a compromise between conflicting aims. If the angle is smaller then there is an increased tendency to cutting or shaving the plastics pipe. If the angle is larger, there is a greater tendency to breaking away of the metal inserts from the surrounding plastics of the finger.
  • the angle may be varied for different pipe materials. It has-been found, however, that an angle of between 30° and 40° is satisfactory.
  • the annular support ring 2 has an internal radius r b that is greater than the internal radius r t defined by the tips of the teeth 15 (see fig. 2).
  • the difference d between the two radii is of the order of 0.5 mm. This difference restricts the distance that the teeth can penetrate into the radially outer surface of the pipe spigot 10, as can be seen from Figure 4. If d is too small, the teeth 15 will slide along the surface of the spigot. If this distance is too large, there is a danger that the teeth will cause failure by cutting through the pipe spigot.
  • the outside diameter of the fingers 4 is 3 mm greater than the inside diameter, giving a finger thickness of 1.5 mm.
  • the stiffness of the radial flexion of the fingers 4 is such as to provide an inward radial force and thereby cause an initial bite of the teeth 15 into a radially outer surface of a spigot, when inserted. This ensures a much greater, axial displacement resisting bite from the application of an axial load to the spigot.
  • the thickness and length of the fingers are influential in this, as is the torsional rigidity of the support ring 2. These characteristics take into account the outer diameter of the spigot with which the grab wedge is to be used, because the difference between r t and the outer radius of the spigot will also affect the level of radial force.
  • Figure 3 In particular the fact that the inner edges of each of the metal inserts has a radius which is greater than the radius of the pipe they are in contact with. This provides two features:
  • the contact point is very narrow initially so the pressure on the pipe from the metal insert is relatively high - helping to provide a good initial "bite". As the metal insert bites into the pipe due to the wedge action the contact width will increase rapidly, providing a substantial cross sectional area of contact to resist the axial loads.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Joints With Sleeves (AREA)
  • Snaps, Bayonet Connections, Set Pins, And Snap Rings (AREA)
  • Adornments (AREA)

Abstract

L'invention se rapporte à un anneau de prise en plastique (14) destiné à être utilisé dans une extrémité femelle à ajustage gras. Cet anneau comporte des éléments de résistance en métal (16) encastrés dans sa structure. Ces éléments présentent des parties allongées (17) alignées par rapport à un axe le long duquel se transmet une force de traction sous l'effet d'une force d'assemblage. Selon un autre mode de réalisation, un anneau de prise (14) comporte une 'bouche' présentant un diamètre décroissant et ce, en raison de la présence de doigts s'étendant de manière axiale (4) sur l'anneau de prise, ces doigts étant pourvus de surfaces internes au rayon courbé (30). L'orientation des éléments de résistance permet de résister à la rupture. La forme de la 'bouche' sert à centrer l'extrémité mâle au cours de l'insertion, avant l'insertion de l'anneau dans l'extrémité femelle.
PCT/GB1998/001533 1997-05-27 1998-05-27 Anneau de prise et extremite femelle englobant un anneau de prise Ceased WO1998054504A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU76647/98A AU7664798A (en) 1997-05-27 1998-05-27 Grab ring and socket incorporating a grab ring

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9710919.3 1997-05-27
GB9710919A GB2325718B (en) 1997-05-27 1997-05-27 Grab ring and socket incorporating a grab ring

Publications (1)

Publication Number Publication Date
WO1998054504A1 true WO1998054504A1 (fr) 1998-12-03

Family

ID=10813122

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1998/001533 Ceased WO1998054504A1 (fr) 1997-05-27 1998-05-27 Anneau de prise et extremite femelle englobant un anneau de prise

Country Status (7)

Country Link
AR (1) AR012750A1 (fr)
AU (1) AU7664798A (fr)
CO (1) CO4840544A1 (fr)
GB (2) GB2369167B (fr)
PE (1) PE42999A1 (fr)
WO (1) WO1998054504A1 (fr)
ZA (1) ZA984487B (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1245297A1 (fr) * 2001-03-27 2002-10-02 I.M.P.A. F.LLI Togno S.r.l. Buse à montage rapide pour fluide à haute pression, en particulier pour utilisation dans les saunas, cabines de douches et équipements similaires
GB2398612A (en) * 2003-02-21 2004-08-25 Glynwed Pipe Systems Ltd Pipe coupling
WO2012051481A1 (fr) 2010-10-15 2012-04-19 Swagelok Company Raccord instantané de conduit à virole
US9903518B2 (en) 2013-10-24 2018-02-27 Swagelok Company Single action push to connect conduit fitting
GB2532809A (en) * 2015-04-09 2016-06-01 Pegler Yorkshire Group Ltd Seal
US10458582B2 (en) 2015-04-23 2019-10-29 Swagelok Company Single action push to connect conduit fitting with colleting
ES2755400T3 (es) 2015-04-23 2020-04-22 Swagelok Co Conjunto de conector de empuje para conexión para un conducto
KR20210144674A (ko) 2019-04-01 2021-11-30 스웨이지락 캄파니 푸시 투 커넥트 도관 이음쇠 어셈블리 및 장치

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2380483A1 (fr) * 1977-02-09 1978-09-08 Guest John Raccord pour tube
GB2150243A (en) * 1983-11-23 1985-06-26 Guest John D Couplings for tubes
GB2301158A (en) * 1995-05-26 1996-11-27 Guest John D Tube coupling with releasable tube gripping collet

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL6406152A (fr) * 1963-07-05 1965-01-06
GB1024537A (en) * 1963-10-30 1966-03-30 Neue Argus Gmbh Push-in pipeline coupling with displaceable unlocking ring
GB1550624A (en) * 1976-06-17 1979-08-15 British Steel Corp Pipe joints and pipe couplings
GB1573757A (en) * 1977-02-09 1980-08-28 Guest J D Couplings for tubes
GB2034841B (en) * 1978-10-19 1983-02-09 Wavin Bv Pipe sockets
GB9506183D0 (en) * 1995-03-27 1995-05-17 Glynwed Plastics Improvements in or relating to pipe couplings
GB2336638B (en) * 1995-07-07 2000-03-01 Marley Extrusions Push-fit tube couplings

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2380483A1 (fr) * 1977-02-09 1978-09-08 Guest John Raccord pour tube
GB2150243A (en) * 1983-11-23 1985-06-26 Guest John D Couplings for tubes
GB2301158A (en) * 1995-05-26 1996-11-27 Guest John D Tube coupling with releasable tube gripping collet

Also Published As

Publication number Publication date
GB0203048D0 (en) 2002-03-27
AU7664798A (en) 1998-12-30
GB2325718B (en) 2002-07-31
GB2369167B (en) 2002-07-31
ZA984487B (en) 1998-12-02
GB2325718A (en) 1998-12-02
AR012750A1 (es) 2000-11-08
PE42999A1 (es) 1999-05-17
GB9710919D0 (en) 1997-07-23
CO4840544A1 (es) 1999-09-27
GB2369167A (en) 2002-05-22

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