EP0576488A1 - Raccord de tuyau - Google Patents

Raccord de tuyau

Info

Publication number
EP0576488A1
EP0576488A1 EP19920906569 EP92906569A EP0576488A1 EP 0576488 A1 EP0576488 A1 EP 0576488A1 EP 19920906569 EP19920906569 EP 19920906569 EP 92906569 A EP92906569 A EP 92906569A EP 0576488 A1 EP0576488 A1 EP 0576488A1
Authority
EP
European Patent Office
Prior art keywords
pipe
spigot
sleeve
grooves
ribs
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.)
Withdrawn
Application number
EP19920906569
Other languages
German (de)
English (en)
Inventor
Trevor Reginald Smith
Andrew Welfare
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.)
Glynwed Pipe Systems Ltd
Original Assignee
Wask RMF 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 Wask RMF Ltd filed Critical Wask RMF Ltd
Publication of EP0576488A1 publication Critical patent/EP0576488A1/fr
Withdrawn legal-status Critical Current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
    • F16L33/00—Arrangements for connecting hoses to rigid members; Rigid hose-connectors, i.e. single members engaging both hoses
    • F16L33/22—Arrangements for connecting hoses to rigid members; Rigid hose-connectors, i.e. single members engaging both hoses with means not mentioned in the preceding groups for gripping the hose between inner and outer parts
    • F16L33/225—Arrangements for connecting hoses to rigid members; Rigid hose-connectors, i.e. single members engaging both hoses with means not mentioned in the preceding groups for gripping the hose between inner and outer parts a sleeve being movable axially

Definitions

  • This invention relates to a pipe fitting.
  • Plastics pipes are widely used in, for example, fuel gas and water distribution networks where it is important that all connections between pipes and between pipes and various appliances are very reliable.
  • the connections must be leak proof and strong enough to prevent them from being pulled apart as a result of any end load on a pipe. Such an end load may result from thermal expansion or contraction in the pipe's length.
  • the coupling is assembled by pulling the sleeve on to the end of the pipe containing the spigot, thus deforming the pipe which is compressed between the sleeve and spigot. Some of the plastics material is forced into the circumferential grooves in the spigot, thereby forming a very strong and leak proof connection.
  • the spigot may be integral with an appliance to which the pipe is to be connected or integral with a second spigot thus facilitating pipe to pipe connections.
  • Pipe couplings of this sort have been in successful use for many years, but it is necessary to exercise strict control over the manufacturing tolerances of both the pipe to be connected and the spigot and sleeve components. If, for instance, the pipe is produced with a wall thickness which is too large, or a spigot is produced with an outside diameter too large, or a sleeve produced with the inside diameter too small, then the annular gap between the insert and the sleeve may be too small to accommodate the pipe material. Thus when the sleeve is slid over the end of the pipe containing the spigot to- assemble the coupling a relatively large amount of the pipe material is forced ahead of the sleeve and high compressive forces are included in the pipe material.
  • a pipe coupling comprising a tubular spigot for insertion into the end of a pipe, and a sleeve for positioning over the end of a pipe into which the spigot has been inserted to thereby trap the pipe end between the spigot and sleeve, the outer surface of the spigot defining a plurality of circumferential ribs separated by circumferential grooves, wherein the mean cross-sectional area of the space defined between the radially outer surface of the spigot and the radially inner surface of the sleeve in the assembled coupling reduces from the end of the spigot which is first inserted into the pipe.
  • the mean cross-sectional area of the space radially outside the groove and rib closest to the said first inserted end is greater than the mean cross-sectional area of the space radially outside the groove and rib next closest to the said first inserted end, the mean cross-sectional area reducing for each adjacent groove and rib pair along the length of the spigot.
  • the reduction in cross- sectional area may be achieved for example by tapering the spigot, or by "stepping" adjacent rib and groove pairs along the length of the spigot.
  • the ribs may be of constant width and the grooves of progressively varying width along the length of the spigot, or the grooves could be of constant width and the ribs of progressively varying width along the length of the spigot.
  • Figure 1 is a part sectional view of a spigot of a coupling according to the present invention
  • Figure 2 is an enlarged cross sectional view of part of the spigot of Figure 1;
  • Figure 3 is a part sectional view of a coupling according to the present invention incorporating the spigot of Figure 1 prior to assembly;
  • Figure 4 shows in section part of the coupling of Figure 1 fully assembled
  • Figure 5 is an enlarged cross sectional view of part of an alternative spigot of a coupling in accordance with the present invention.
  • the spigot consists of a tapered tubular body 1 with an additionally tapered narrow end 2 and an external annular flange 3 at its wider end.
  • the tubular body 1 is formed with circumferential ribs 4 separated by circumferential grooves 5, on its external surface.
  • the grooves 5 have straight sides and a straight base with obtuse angles being formed between the base and sides, and the ribs have a flattened crest. All the ribs 4 and grooves 5 are of the same height and depth respectively, the bases of the grooves 4 and the crests of the ribs 4 having the same angle of taper.
  • This angle of taper is indicated by the two broken lines, one of which is parallel to the main spigot axis and the other of which is parallel to the crests of the ribs and the base of the grooves.
  • the flange 3 is provided with bolt holes 6 so that the spigot may be connected to another device (not shown), e.g. another spigot to facilitate pipe to pipe connections.
  • another device e.g. another spigot to facilitate pipe to pipe connections.
  • a conventional loose flange will be provided, the loose flange acting on a stub projecting from the spigot.
  • the spigot of Figure 1 is used with a sleeve 7 shown in Figure 3.
  • the sleeve 7 is first slipped over the end of a pipe 8.
  • the internal diameter of the sleeve 7 is substantially the same as the external diameter of the pipe 8, whereas the external diameter of the ribs 4 is greater than the internal diameter of the pipe 8.
  • a hydraulic or mechanical press (not shown) is first used to force the spigot into the pipe end, causing the pipe end to radially expand, and is then used to force the sleeve 7 over the end of the pipe 8 surrounding the spigot body 1. The end of the pipe 8 is thus compressed between the sleeve and the spigot.
  • each groove 5 is filled by the pipe material forced into it depends on the thickness of the pipe wall and the difference between the diameter of the base of the groove 5 and the internal diameter of the sleeve 7.
  • the first groove 5 near the end of the spigot is only slightly filled, each successive groove 5 then being filled to a greater degree as the diameter of the spigot body increases. This continues along the length of the spigot. Beyond this point material from the pipe is forced to flow along the length of the coupling as the sleeve is pushed home.
  • Figure 5 shows part of an alternative spigot in which the tapering of the spigot body 1 is achieved by "stepping" successive rib and groove pairs.
  • Figure 5 also shows an alternative configuration for the end of the spigot body 1, which is stepped as opposed to tapered.
  • the axial dimensions of successive ribs and/or grooves may vary.
  • the ribs may be of constant width and the grooves of progressively reducing width, or the grooves could be of constant width and the ribs of progressively increasing width.
  • any of the aforementioned embodiments of the spigot could be combined in any combination, for example a tapered insert with successively wider grooves, taper angles which vary along the length of the spigot, or different step heights between adjacent grooves and ribs.
  • a combination of a parallel spigot with a tapered sleeve bore could achieve the desired loud distinction.
  • the taper of the spigot and/or the varying dimensions of the grooves can be chosen to suit the characteristics of any particular plastics material and the required compression along the length of the coupling.
  • the present invention provides a range of possible advantages, for example:

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Joints With Sleeves (AREA)
  • Joints That Cut Off Fluids, And Hose Joints (AREA)

Abstract

On décrit un raccord de tuyau comportant une partie à emboîtement tubulaire (1) devant être introduit dans l'extrémité d'un tuyau (8) et un manchon (7) à placer sur l'extrémité du tuyau (8) dans lequel la partie à emboîtement (1) a été introduite. La surface extérieure de ladite partie (1) définit une série de serrures périphériques (4) séparées par des rainures périphériques (5). Lorsque le raccord est assemblé, le manchon (7) serre l'extrémité du tuyau (8) contre la partie à emboîtement (1) de manière que les nervures (4) soient plaquées contre la paroi interne du tube, et la matière déplacée par les nervures (4) soit poussée dans les rainures (5). La superficie moyenne de la section de l'espace défini entre la surface radialement extérieure de la partie à emboîtement (1) et la surface radialement intérieure du manchon (7) dans le raccord assemblé diminue depuis l'extrémité (2) de la partie è emboîtement (1) qui est introduite d'abord dans le tuyau. De cette manière, la compression de l'extrémité du tuyau (8) augmente vers l'extrémité du tuyau, garantissant que les tuyaux à paroi relativement épaisse sont serrés fortement près de l'extrémité à emboîtement (2), tandis que des tuyaux à paroi relativement mince sont serrés fortement par les nervures (4) et les rainures (5) éloignées de l'extrémité de la partie à emboîtement.
EP19920906569 1991-03-22 1992-03-18 Raccord de tuyau Withdrawn EP0576488A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB919106172A GB9106172D0 (en) 1991-03-22 1991-03-22 A pipe fitting
GB9106172 1991-03-22

Publications (1)

Publication Number Publication Date
EP0576488A1 true EP0576488A1 (fr) 1994-01-05

Family

ID=10692069

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920906569 Withdrawn EP0576488A1 (fr) 1991-03-22 1992-03-18 Raccord de tuyau

Country Status (7)

Country Link
EP (1) EP0576488A1 (fr)
JP (1) JPH06506047A (fr)
AU (1) AU1379292A (fr)
BR (1) BR9205801A (fr)
CA (1) CA2106686A1 (fr)
GB (1) GB9106172D0 (fr)
WO (1) WO1992016782A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9205824D0 (en) * 1992-03-18 1992-04-29 Wask Rmf Ltd Pipe coupling
IL178438A0 (en) * 2006-10-04 2007-02-11 Netafim Ltd Coupling
BRPI0816024B1 (pt) * 2007-09-14 2019-03-12 Bhp Billiton Petroleum Pty Ltd. Conector de extremidade para uma mangueira de compósito e mangueira

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2158538A (en) * 1938-07-14 1939-05-16 Daniel B Gish Hose
AU413979B1 (en) * 1966-07-14 1971-06-04 Improvements in hose end fittings
FR2213444A1 (fr) * 1973-01-05 1974-08-02 Raoul Jean Jacques
GB1539060A (en) * 1975-06-13 1979-01-24 Btr Industries Ltd End fittings for hoses

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9216782A1 *

Also Published As

Publication number Publication date
BR9205801A (pt) 1994-06-28
GB9106172D0 (en) 1991-05-08
JPH06506047A (ja) 1994-07-07
WO1992016782A1 (fr) 1992-10-01
CA2106686A1 (fr) 1992-09-23
AU1379292A (en) 1992-10-21

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19930921

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IT LI LU NL SE

17Q First examination report despatched

Effective date: 19950307

18D Application deemed to be withdrawn

Effective date: 19950718