EP0778929A1 - Raccord de tubes, arme a calibres variables - Google Patents

Raccord de tubes, arme a calibres variables

Info

Publication number
EP0778929A1
EP0778929A1 EP95927256A EP95927256A EP0778929A1 EP 0778929 A1 EP0778929 A1 EP 0778929A1 EP 95927256 A EP95927256 A EP 95927256A EP 95927256 A EP95927256 A EP 95927256A EP 0778929 A1 EP0778929 A1 EP 0778929A1
Authority
EP
European Patent Office
Prior art keywords
sleeve
conduit
tube
connector assembly
spirally
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Withdrawn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
EP95927256A
Other languages
German (de)
English (en)
Inventor
Roger Keith
Gordon L. Ackland
Janice M. Wentworth
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.)
3M Co
Original Assignee
Minnesota Mining and Manufacturing Co
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 Minnesota Mining and Manufacturing Co filed Critical Minnesota Mining and Manufacturing Co
Publication of EP0778929A1 publication Critical patent/EP0778929A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G15/00—Cable fittings
    • H02G15/08—Cable junctions
    • H02G15/18—Cable junctions protected by sleeves, e.g. for communication cable
    • H02G15/1806—Heat shrinkable sleeves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
    • B29C61/06—Making preforms having internal stresses, e.g. plastic memory
    • B29C61/0608—Making preforms having internal stresses, e.g. plastic memory characterised by the configuration or structure of the preforms
    • B29C61/065—Preforms held in a stressed condition by means of a removable support; Supports therefor
    • 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
    • F16L13/00—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints
    • F16L13/004—Shrunk pipe-joints
    • 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
    • F16L47/20—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics based principally on specific properties of plastics
    • F16L47/22—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics based principally on specific properties of plastics using shrink-down material
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G15/00—Cable fittings
    • H02G15/08—Cable junctions
    • H02G15/18—Cable junctions protected by sleeves, e.g. for communication cable
    • H02G15/182—Cable junctions protected by sleeves, e.g. for communication cable held in expanded condition in radial direction prior to installation
    • H02G15/1826—Cable junctions protected by sleeves, e.g. for communication cable held in expanded condition in radial direction prior to installation on a removable hollow core, e.g. a tube
    • H02G15/1833—Cable junctions protected by sleeves, e.g. for communication cable held in expanded condition in radial direction prior to installation on a removable hollow core, e.g. a tube formed of helically wound strip with adjacent windings, which are removable by applying a pulling force to a strip end

Definitions

  • the present invention relates generally to the joining of two pieces of tubing, and more particularly, to the joining of the ends of polymeric conduit used to insulate and protect electrical cables.
  • One method of protecting underground electrical cables is by the use of polymeric conduit, usually polyethylene, which surrounds the cable and provides protection from environmental elements such as water and dirt.
  • the conduit may also provide electrical insulation, although this function is not its primary purpose. Since the conduit comes in finite lengths, it is necessary to join the ends of serial lengths of conduit to accommodate long lengths of cable.
  • the present invention provides a means for joining the ends of conduit which may be easily accomplished in the field. Additionally, the present invention allows the connection of the cable insulation itself in addition to or instead of merely connecting the conduit which contains the cable.
  • the present invention includes a connector assembly for joining the ends of two lengths of conduit, which connector assembly comprises a spirally-wound, reinforcing sleeve positioned to span the distance between the ends of the conduits and overlie the conduit ends and at least one elastic tube which covers the sleeve and preferably extends beyond the ends of the sleeve to contact the two conduits.
  • the elastic tube may be one tube having a length sufficient to extend from one conduit to the other or may be two elastic tubes, each of which covers one conduit, the joint between the reinforcing sleeve and the conduit and a portion of the sleeve.
  • the connector assembly may also include an injector port as a part of the reinforcing, spirally- wound sleeve, to permit the injection of waterproofing or other fluid into the joint between the conduit ends or into the gap between the ends of the insulation of two cables.
  • Figure 1 is a perspective view illustrating two conduit ends and a connector assembly of the present invention
  • Figure 2 is a perspective view of a reinforcing, spirally-wound sleeve forming a portion of the connector assembly of figure 1
  • Figure 3 is a perspective view illustrating two conduit ends and an elastic tube of the connector assembly of Figure 1
  • Figure 4 is a top view of an alternate embodiment of the spirally-wound sleeve of the present invention
  • Figure 5 is a plan view of the sleeve of Figure 4 prior to coiling
  • Figure 6 is an end view of the sleeve of Figure 4
  • Figure 7 is a side elevational view of an alternate embodiment of the connector assembly of the present invention.
  • FIG. 1 illustrates a connector assembly, generally indicated as 10, of the present invention as it is utilized to cover and connect the ends of two conduits 12 and 14.
  • the connector assembly 10 includes an outer, elastic tube 16 and an inner, reinforcing, spirally- wound sleeve 18.
  • the reinforcing sleeve 18 is also illustrated in Figure 2 where the spiral nature of the sleeve 18 is more readily apparent.
  • the sleeve 18 be spirally wound, wherein a longitudinal edge 20 of the sleeve 18 overlaps and covers a portion of the sleeve 18, so that the sleeve 18 may accommodate a wide variety of conduit 12 and 14 diameters by uncoiling or more tightly coiling the spiral of the sleeve 18.
  • the sleeve 18 is preferably manufactured of a polymeric material, such as high density polyethylene, but may also be fashioned from sheet metal, if desired.
  • a preferred method of forming the sleeve 18 is longitudinally slitting an extruded tube, but other methods, such as coiling a flat sheet, are acceptable.
  • Figure 3 illustrates the conduit ends 12 and 14 as the conduit ends 12 and 14 are disposed prior to assembly of the connector assembly 10.
  • Figure 3 also illustrates the elastic tube 16 in one form in which it may be conveniently applied to the conduit 14.
  • the elastic tube 16 is in a form described in U.S. Patent No. 3,515,798, assigned to the assignee of the present invention and herein incorporated by reference, wherein the elastic tube 16 is pre-stretched and supported on a removable core 24.
  • the core 24 is scored along a helical path 26 and may be removed in a long, continuous strip by pulling on the end 28 which unwinds the core 24 along the helical scoring 26. Removal of the core 24 allows the tube 16 to contract to its original dimensions.
  • FIG. 3 illustrates an intermediate step in the assembly of the connector assembly 10 to the conduit ends 12 and 14.
  • the tube 16 in an expanded condition has been assembled to the conduit 14 by displacing one conduit end 14 from its alignment with the other conduit end 12 and sliding the tube 16 along the conduit 14.
  • the next assembly step is to position the sleeve 18 over the conduit ends 12 and 14 by likewise displacing one of the conduit ends 12 or 14 from alignment with the other conduit end 12 or 14 and sliding the sleeve 18 over the conduit 12 or 14.
  • the sleeve 18 is then retracted along the conduit 12 or 14, the ends of the conduit 12 and 14 again aligned and the sleeve 18 slid towards the other conduit end 12 or 14 to span the gap therebetween and cover both conduit ends 12 and 14 to a substantially identical extent.
  • the tube 16 is then slid to cover the sleeve 18 and preferably extend beyond the ends of the sleeve 18 to cover the conduit ends 12 and 14, substantially as illustrated in Figure 1.
  • the core 24 is removed from the tube 16 and the tube 16 thus permitted to contract to compress the reinforcing sleeve 18 and seal to the conduit ends 12 and 14. It is preferable that the ends of the tube 16 extend beyond the ends of the sleeve 18 so that the tube 16 can provide a seal to protect the connection from environmental contaminants.
  • FIGs 4-6 illustrate an alternate embodiment of a spirally-wound sleeve 30 of the present invention.
  • the spirally-wound sleeve 30 includes injection ports 32 which are accommodated by slots 34 in the sleeve 30.
  • the slots 34 extend from one longitudinal edge 36 and partially into the width of the sleeve 30, in the direction which will become the circumference of the sleeve 30 when it is spirally wound, and in alignment with injection ports 32.
  • Figure 5 illustrates the sleeve 30 in a flat condition while Figures 4 and 6 illustrate from the top and side, respectively, the sleeve 30 as spirally wound for assembly to the conduit ends 12 and 14.
  • the slots 34 are provided to allow the spiral of the sleeve 30 to be more or less tightly wound and, as discussed above, accommodate a range of conduit 12 and 14 diameters.
  • the injection ports 32 are provided to permit a waterproofing or other useful fluid to be injected into the junction between the conduits 12 and 14 or between two cable ends after the sleeve has been assembled to the conduit 12 and 14. If the sleeve 30 of figures 4-6 is utilized, the tube 16 may be assembled over the sleeve 30 as shown in Figure 1, but the injection ports 32 may interfere with the assembly of a single tube 16 to cover such a sleeve 30.
  • An alternative is to utilize two tubes 16 by assembling one expanded tube to each conduit end 12 and 14 and positioning the sleeve 30 between the two tubes 16.
  • Each tube 16 would then cover a conduit end 12 or 14 and the portions of the sleeve 30 which extend from the injection ports 32 to the ends of the sleeve 30.
  • the sleeve 30 is shown provided with two injection ports 32 to allow fluid to be injected into one port 32 while air escapes from the other. It is equally possible to provide the sleeve 30 with only one injection port 32 if air entrapment is not a problem. In this case, only one slot 34 in alignment with the single injection port 32 would be necessary.
  • the injection port 32 is illustrated as being a boss which extends from the sleeve 30. The port 32 could equally well be simply a hole in the sleeve 30.
  • Figure 7 illustrates an embodiment of a connector assembly 40 which includes two features which may make assembly of the connector assembly 40 to the conduit ends 12 and 14 more convenient.
  • the connector assembly 40 is provided with two support cores 42 and 44. In this fashion, the cores 42 and 44 may be stripped from both ends of the connector assembly 40 and neither need be pulled the entire length of the cable assembly 40.
  • the connector assembly 40 is provided with a spirally-wound sleeve 46 which is disposed between the elastic tube 48 and the cores 42 and 44 which support the tube 40.
  • the connector assembly 40 may simply be positioned over the conduit ends 12 and 14 as a unit rather than individually as was described above.
  • the tube contracts towards the conduit ends 12 and 14 and forces the sleeve 46 to wind into a tighter spiral and contact the conduit 12 and 14.

Abstract

La présente invention concerne un ensemble raccord (10) destiné à raccorder les extrémités de deux tubes (12, 14) ou d'autres objets sensiblement cylindriques, et constitué d'un manchon spiralé (18) et d'un tube élastique (16). Le manchon (18) est disposé de façon à recouvrir les deux extrémités tubulaires. L'enroulement spiralé du manchon lui permet de s'adapter au diamètre du tube en formant une spirale plus ou moins serrée. Les dimensions du tube (16), qui peut se resserrer sur le manchon, sont prévues pour que le tube déborde des extrémités du manchon de façon à être en contact avec les extrémités du tube lorsqu'il est resserré.
EP95927256A 1994-08-29 1995-07-17 Raccord de tubes, arme a calibres variables Withdrawn EP0778929A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US29703094A 1994-08-29 1994-08-29
US297030 1994-08-29
PCT/US1995/009053 WO1996007049A1 (fr) 1994-08-29 1995-07-17 Raccord de tubes, arme a calibres variables

Publications (1)

Publication Number Publication Date
EP0778929A1 true EP0778929A1 (fr) 1997-06-18

Family

ID=23144574

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95927256A Withdrawn EP0778929A1 (fr) 1994-08-29 1995-07-17 Raccord de tubes, arme a calibres variables

Country Status (4)

Country Link
EP (1) EP0778929A1 (fr)
JP (1) JPH10505149A (fr)
CA (1) CA2196300A1 (fr)
WO (1) WO1996007049A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100499819B1 (ko) * 1996-12-19 2005-07-07 레이켐 리미티드 케이블 밀봉 장치 및 방법
JP4889160B2 (ja) * 2001-05-15 2012-03-07 スリーエム イノベイティブ プロパティズ カンパニー チューブ被覆物品、チューブ被覆装置及びチューブ被覆方法
US6911596B2 (en) 2001-05-15 2005-06-28 3M Innovative Properties Company Method for covering an article with a tubular cover member, tubular cover member and covered article
CN1734874B (zh) * 2005-07-19 2010-05-12 上海上缆辐照技术开发有限公司 电力电缆等直径连接器及其制造工艺
US11506310B2 (en) * 2018-01-24 2022-11-22 Sartorius Stedim North America Inc. Fluid transfer assembly
CN114392406B (zh) * 2022-01-21 2022-09-23 中山大学孙逸仙纪念医院 一种医用腔内管道可视化的电子内窥装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB352877A (en) * 1929-11-29 1931-07-16 Gen Electric Improvements in and relating to electrical cables
GB979833A (en) * 1963-07-26 1965-01-06 Standard Telephones Cables Ltd Electric cable joints
FR2054896A5 (fr) * 1969-07-30 1971-05-07 Sumitomo Electric Industries
GB1470049A (en) * 1973-03-21 1977-04-14 Rachem Corp Splicing method and heat-recoverable article
GB1594573A (en) * 1976-11-05 1981-07-30 Raychem Sa Nv Sealing and insulating heat-recoverable article and method
BE880992A (fr) * 1979-01-05 1980-05-02 Raychem Corp Perfectionnements aux dispositifs a reprise thermique
US4709948A (en) * 1985-08-19 1987-12-01 Raychem Limited Fibre reinforced polymeric article

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9607049A1 *

Also Published As

Publication number Publication date
WO1996007049A1 (fr) 1996-03-07
JPH10505149A (ja) 1998-05-19
CA2196300A1 (fr) 1996-03-07

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