GB2258711A - Empty conduit assembly with detachable cable - Google Patents

Empty conduit assembly with detachable cable Download PDF

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Publication number
GB2258711A
GB2258711A GB9217343A GB9217343A GB2258711A GB 2258711 A GB2258711 A GB 2258711A GB 9217343 A GB9217343 A GB 9217343A GB 9217343 A GB9217343 A GB 9217343A GB 2258711 A GB2258711 A GB 2258711A
Authority
GB
United Kingdom
Prior art keywords
cable
conduit
conduit assembly
assembly according
attachment means
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.)
Granted
Application number
GB9217343A
Other versions
GB2258711B (en
GB9217343D0 (en
Inventor
James A Cole
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.)
Integral Corp
Original Assignee
Integral Corp
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 Integral Corp filed Critical Integral Corp
Publication of GB9217343D0 publication Critical patent/GB9217343D0/en
Publication of GB2258711A publication Critical patent/GB2258711A/en
Application granted granted Critical
Publication of GB2258711B publication Critical patent/GB2258711B/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
    • H02G1/06—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for laying cables, e.g. laying apparatus on vehicle
    • H02G1/08—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for laying cables, e.g. laying apparatus on vehicle through tubing or conduit, e.g. rod or draw wire for pushing or pulling
    • 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
    • F16L3/00—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets
    • F16L3/22—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets specially adapted for supporting a number of parallel pipes at intervals
    • F16L3/237—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets specially adapted for supporting a number of parallel pipes at intervals for two pipes
    • 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
    • F16L3/00—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets
    • F16L3/26—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets specially adapted for supporting the pipes all along their length, e.g. pipe channels or ducts
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4439—Auxiliary devices
    • G02B6/4459—Ducts; Conduits; Hollow tubes for air blown fibres
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/0072—Electrical cables comprising fluid supply conductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/38—Insulated conductors or cables characterised by their form with arrangements for facilitating removal of insulation
    • 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
    • H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
    • H02G3/02—Details
    • H02G3/04—Protective tubing or conduits, e.g. cable ladders or cable troughs
    • H02G3/0462—Tubings, i.e. having a closed section
    • H02G3/0481—Tubings, i.e. having a closed section with a circular cross-section
    • 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
    • H02G9/00—Installations of electric cables or lines in or on the ground or water
    • H02G9/06—Installations of electric cables or lines in or on the ground or water in underground tubes or conduits; Tubes or conduits therefor

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Laying Of Electric Cables Or Lines Outside (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Details Of Indoor Wiring (AREA)
  • Thermotherapy And Cooling Therapy Devices (AREA)
  • Joints Allowing Movement (AREA)

Description

EMPTY CONDUIT WITIl DETACHABLE CABL -ASSEMBLY AND METHOD OF NAKING SAME Field of the Invention This invention relates generally to communication cable systems, more particularly to cable conduit and cable assemblies, and even more particularly to cable conduit and cable assemblies with means for expanding cable capability.
Background of the Invention The continuing dynamic growth in the communications industry has resulted in the ever increasing demand for additional and different types of communication cables. For example, the initial installation of telephone cables in a particular locality is soon overloaded, with additional cable installations required to meet the expanding communications requirements in that locality. Furthermore, while the vast majority of present day telecommunication, video and data transmissions are over twisted pair telephone and coaxial cables, optical fiber cables are clearly becoming the future transmission media for the communications industry.As a consequence, it becomes imperative that existing non-optical fiber cable assembly installations incorporate assemblies which provide not only for additional future cable installations, but also the capability of installing optical fiber transmission cables in the future without the need of unearthing or replacing the initial installations.
DescriPtion of the Prior Art There are existing prior art systems which have attempted to provide this expanded cable capability. For example, U.S. Patent No. 3,862,349 discloses an underground telephone cable assembly installation in which the telephone cable is disposed inside a flexible outer housing having an outside diameter sufficiently larger than the contained telephone cable so as to provide for future placement of at least one additional cable, a pull wire also being installed along side of the existing cable for this future placement. U.S. Patent No. 3,383,456 discloses a flexible conduit with the electrical conductors being provided within or adjacent the conduit wall so that additional conductors when needed may be drawn through the conduit at a later time without having to remove the conduit.
While these prior art systems in a broad sense enable expanded cable capability, they are not completely satisfactory and have a number of disadvantages associated therewith. For example, in addition to the fact that the existing cable or conductors are located inside the conduit and would thus interfere with the future placement of additional cables therein, as well as increasing the pulling resistance of the future cable installation, the overall construction and design of the prior art systems are deficient in many material respects.
Objects of the Invention It is therefore the principal object of this invention to provide a new and improved conduit/communication cable assembly which provides for expanded cable capability for the future.
Sary of the Invention The present invention is directed to a conduit assembly and a method of making a conduit assembly as defined in the appendant claims. In the conduit assembly, a communication cable is detachably connectable to the outer surface of a flexible, elongated empty cable conduit, with means provided for the future installation of one or more communication cables within the empty conduit, for example after the conduit assembly with attached cable has been installed underground. In accordance with one particular feature of the invention1 the detachably connected cable is of one type, for example a twisted pair telephone cable, while the subsequently installed cable is of a different type, for example an optical fiber cable.
Advantageously, the invention may thus provide an improved conduit assembly which enables subsequent additions or upgrades to an existing cable installation at a minimum of installation cost and a minimum of inconvenience to the customer.
Specific and additional features of the invention, as well as additional objects and advantages thereof, will become readily understood by those skilled in the art from the following detailed description, taken in conjunction with the accompanying drawings.
Brief Description of the Drawings Figure 1 is a partial perspective view of a section of the conduit and original communication cable combination in accordance with the teachings of the present invention, illustrating in phantom an optical fiber cable which will be pulled through the conduit in the future; Figure 2 is a cross sectional view of the conduit and original communication cable illustrating one method of attachment of the original communication cable to the conduit; Figure 3 is a cross sectional view of the conduit and original communication cable illustrating a second method of attachment of the original communication cable to the conduit; Figure 4 is a cross sectional view of the conduit and original communication cable illustrating a third method of attachment of the original communication cable to the conduit;; Figure 5 is a diagrammatical view of the conduit and cable combination, illustrating the ends of the cable having been detached or stripped from the conduit surface.
The drawings are not necessarily to scale, and certain portions may have been exaggerated to emphasize certain details of the invention.
DescriPtion of the Preferred Embodiment In the description which follows, like parts are indicated throughout the specification (and drawings) with the same respective reference numerals.
Referring initially to FIGURE 1 of the drawings, a cable conduit 12 having an outer wall 14 and an inner wall 16 is depicted. The cable conduit 12 is of the type conventionally known in the industry and is generally formed by the extrusion of polymeric material, such as a polyethylene or polyvinyl chloride, to form an elongated, flexible duct to serve as a protective underground housing for a communication transmission cable. One such form of conduit is currently being sold by Integral Corporation of Dallas, Texas, the assignee of this invention, under the CABLECON trademark.
In accordance with conventional approaches, the cable conduit is buried underground with the particular transmission cable normally either already having been pre-inserted within the conduit or inserted within the conduit after the conduit is buried.
In accordance with the present invention, however, and with reference again to FIGURE 1, the transmission cable 10 is attached to and in parallel with the outer wall 14 of conduit 12.
This assembly is then installed underground, and cable 10 provides the-initial communication link at the time of installation. The cable 10 will therefore be hereinafter referred to as the original cable", and under present day applications would normally be either a twisted pair or coaxial type cable. The conduit 12, being completely empty, thus serves as a raceway for the future insertion of a cable 20. Cable 20 will therefore be hereinafter referred to as the "subsequently installed cable", and in this example would be an optical fiber cable.
To facilitate the future installation of the subsequently installed cable, a string or pull member 18 (FIGURES 2-4) is also preinstalled in the conduit 12, paralleling the length of the conduit, for use in pulling or drawing in the cable 20 through the empty conduit. In addition, it is desirable that the inner wall 16 of the conduit be prelubricated or formed of prelubricated material to facilitate this cable pull-through.
In accordance with a principal feature of the present invention, the original cable 10 is detachably connected to the conduit wall 14 so that the cable, when necessary, may be separated or stripped from the conduit 12 at its splicing ends lOa, as illustrated in FIGURE 5. Accordingly, three different methods or embodiments for effecting this detachable connection are respectively depicted in FIGURES 2, 3 and 4, and are now described.
Referring to FIGURE 2, the conductor cable 10 is removably attached, and held in parallel proximity, to the conduit 12 by a frangible polymer jacket 24 formed along the length of the cable-conduit assembly (as illustrated in FIGURE 1). This jacket, preferably of a thickness not greater than 0.76 mm may be coextruded at the same time as the extrusion of conduit 12, with the original cable 10 being positioned between the outer wall 14 and jacket 24 during the co-extrusion process.
Alternatively, and with reference to FIGURE 3, a thin frangible web 26 may be formed intermediate, and along the length of, the cable 10 and conduit surface 14, the web 26 retaining the original cable 10 to conduit 12 until it is broken to free the ends lOa from the conduit outer wall.
In the embodiment illustrated in FIGURE 4, a pair of resilient grasping extensions 28 with retention fingers 28a may be integrally formed as part of, and at the time of the extrusion of, the conduit 12, these extensions retaining the cable 10 in parallel and proximate to the conduit wall 14. In this example, the original cable 10 will be removably connected with the conduit after the completion of the extrusion process.
The detachable connection of original cable 10 with conduit 12 enables the release of the cable, as shown in FIGURE 5, in order to alter the direction of the flow of the cable and conduit at the splicing ends, for example. In the example shown in FIGURES 1-3, the detachment will be effected by selectively fracturing the jacket 24 or web 26; in the example shown in FIGURE 4, the cable 10 is selectively pulled free from the resilient grasp of grasping assembly 28.
While preferred embodiments of the present invention have been shown and described herein, further modifications and improvements may be made by those skilled in the art without departing from the spirit and scope of the invention, as solely defined by the appended claims.

Claims (10)

CLAIMS:
1. A conduit assembly having an internal portion (16) for receiving a cable (20), characterised by attachment means (24,26,28,28a) for detachably fastening an external cable (10) along an external portion (14) of the assembly.
2, A cable conduit having outer and inner walls for receiving a length of a subsequently installed-cable to be drawn through said conduit, the improvement comprising: an original cable paralleling and connected with said outer wall of said conduit; and, attachment means detachably connecting said original cable to said outer wall of said conduit.
3. A conduit assembly according to claim 1 or claim 2, in which the attachment means comprises a frangible jacket (24).
4. A conduit assembly according to claim 1 or claim 2, in which the attachment means comprises a frangible web (26).
5. A conduit assembly according to claim 1 or claim 2, in which the attachment means comprises a resilient grasping extension assembly (28,28a).
6. A conduit assembly according to any preceding claim, in which the external cable and the internal cable are different types of communication cable.
7. A conduit assembly according to any preceding claim, in which the internal cable is an optical fibre cable.
8. A conduit assembly according to any preceding claim, in which the internal portion contains a pull-member (18) for drawing in a cable to be received therein.
9. A method of making a conduit assembly according to any preceding claim, characterised in that the conduit assembly is manufactured by extrusion, the attachment means being coextruded therewith and the external cable being positioned within or attached to the attachment means during the coextrusion process.
10. A method of making a conduit assembly according to claim 5, characterised in that the conduit assembly is extruded, the external cable being fastenable to the resilient grasping extension assembly after manufacture of the conduit assembly.
GB9217343A 1991-08-16 1992-08-14 Empty conduit with detachable cable assembly and method of making same Expired - Fee Related GB2258711B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US74572791A 1991-08-16 1991-08-16

Publications (3)

Publication Number Publication Date
GB9217343D0 GB9217343D0 (en) 1992-09-30
GB2258711A true GB2258711A (en) 1993-02-17
GB2258711B GB2258711B (en) 1995-06-14

Family

ID=24997984

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9217343A Expired - Fee Related GB2258711B (en) 1991-08-16 1992-08-14 Empty conduit with detachable cable assembly and method of making same

Country Status (14)

Country Link
AU (1) AU664376B2 (en)
BE (1) BE1005584A5 (en)
CA (1) CA2076070A1 (en)
CH (1) CH688214A5 (en)
DE (1) DE4227464A1 (en)
ES (1) ES2040661B1 (en)
FI (1) FI923659A (en)
FR (1) FR2684247B1 (en)
GB (1) GB2258711B (en)
IE (1) IE79449B1 (en)
IT (1) IT1263227B (en)
NL (1) NL193878C (en)
NO (1) NO304810B1 (en)
SE (1) SE504841C2 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5678609A (en) * 1995-03-06 1997-10-21 Arnco Corporation Aerial duct with ribbed liner
GB2322180A (en) * 1997-02-15 1998-08-19 Smiths Industries Plc Flexible hose, e.g. for vacuum cleaner, with longitudinal channel
US5927757A (en) * 1997-02-15 1999-07-27 Smiths Industries Public Limited Company Hose assemblies
EP1006534A1 (en) * 1998-12-04 2000-06-07 Labinal Electrical connection cable
FR2819950A1 (en) * 2001-01-23 2002-07-26 Infra Sa Electric cable with optical fibre seating includes open sided channel between cables receiving optical fibre
EP2426800A1 (en) * 2010-09-07 2012-03-07 FRÄNKISCHE ROHRWERKE GEBR. KIRCHNER GmbH & Co KG Electrical installation tube with at least one data line
CN104405958A (en) * 2014-11-26 2015-03-11 湖北凯科塑业有限公司 PVC-U corrugated pipe material
WO2016043834A1 (en) * 2014-09-19 2016-03-24 Wesco Distribution, Inc. Pressurized conduit rodder

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29507689U1 (en) * 1995-05-10 1995-07-20 Festo Kg, 73734 Esslingen Multiple hose for electro-pneumatic applications
WO2000006933A2 (en) * 1998-07-28 2000-02-10 Safetyliner Systems, Llc Enhancement of profiled tubular lining systems by channel augmentation
CA2641048C (en) * 2006-02-02 2014-09-09 Elmer H. Hara Pipeline leakage-sensing device
DE102006038351A1 (en) * 2006-07-18 2008-01-24 Leoni Kabel Holding Gmbh & Co. Kg Supply cable and method of making the supply cable
NO332390B1 (en) * 2010-12-14 2012-09-10 Aker Subsea As The umbilical clamp

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3580983A (en) * 1969-12-03 1971-05-25 Nat Catheter Corp Conductive line tube
GB1547114A (en) * 1976-11-08 1979-06-06 Dayco Corp Polymeric flexible hose construction and method of making same
GB2027553A (en) * 1978-08-08 1980-02-20 Kendall C E Impact-resistant control line protector device
GB2156033A (en) * 1984-03-21 1985-10-02 Festo Kg Multiple hose
GB2178506A (en) * 1985-06-21 1987-02-11 Webco Ltd Pipeline

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1266991A (en) * 1960-09-08 1961-07-17 Hartley Electromotives Ltd Improvements made to conduits intended to receive wires or cables of electrical installations
DE6600017U (en) * 1967-09-22 1969-01-02 Klempau F
BE712170A (en) * 1968-03-14 1968-09-16
GB2123978B (en) * 1982-07-12 1985-09-11 Telephone Cables Ltd Optical fibre cable
EP0160498A3 (en) * 1984-04-23 1987-01-14 Marcello Valenzano Conduit cable support

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3580983A (en) * 1969-12-03 1971-05-25 Nat Catheter Corp Conductive line tube
GB1547114A (en) * 1976-11-08 1979-06-06 Dayco Corp Polymeric flexible hose construction and method of making same
GB2027553A (en) * 1978-08-08 1980-02-20 Kendall C E Impact-resistant control line protector device
GB2156033A (en) * 1984-03-21 1985-10-02 Festo Kg Multiple hose
GB2178506A (en) * 1985-06-21 1987-02-11 Webco Ltd Pipeline

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5678609A (en) * 1995-03-06 1997-10-21 Arnco Corporation Aerial duct with ribbed liner
GB2322180A (en) * 1997-02-15 1998-08-19 Smiths Industries Plc Flexible hose, e.g. for vacuum cleaner, with longitudinal channel
US5927757A (en) * 1997-02-15 1999-07-27 Smiths Industries Public Limited Company Hose assemblies
GB2322180B (en) * 1997-02-15 2001-06-20 Smiths Industries Plc Hose assemblies
EP1006534A1 (en) * 1998-12-04 2000-06-07 Labinal Electrical connection cable
FR2786912A1 (en) * 1998-12-04 2000-06-09 Labinal ELECTRICAL CONNECTION CABLE
FR2819950A1 (en) * 2001-01-23 2002-07-26 Infra Sa Electric cable with optical fibre seating includes open sided channel between cables receiving optical fibre
EP2426800A1 (en) * 2010-09-07 2012-03-07 FRÄNKISCHE ROHRWERKE GEBR. KIRCHNER GmbH & Co KG Electrical installation tube with at least one data line
WO2016043834A1 (en) * 2014-09-19 2016-03-24 Wesco Distribution, Inc. Pressurized conduit rodder
US10967408B2 (en) 2014-09-19 2021-04-06 Wesco Distribution, Inc. Pressurized conduit rodder
CN104405958A (en) * 2014-11-26 2015-03-11 湖北凯科塑业有限公司 PVC-U corrugated pipe material

Also Published As

Publication number Publication date
DE4227464A1 (en) 1993-02-25
SE504841C2 (en) 1997-05-12
ITRM920607A1 (en) 1994-02-17
ITRM920607A0 (en) 1992-08-17
AU2106392A (en) 1993-02-18
GB2258711B (en) 1995-06-14
AU664376B2 (en) 1995-11-16
FR2684247B1 (en) 1997-05-09
NO923203D0 (en) 1992-08-14
IE79449B1 (en) 1998-05-06
ES2040661B1 (en) 1995-01-01
NO304810B1 (en) 1999-02-15
ES2040661R (en) 1994-06-16
IT1263227B (en) 1996-08-05
SE9202352D0 (en) 1992-08-14
FI923659A0 (en) 1992-08-14
NL9201468A (en) 1993-03-16
NO923203L (en) 1993-02-17
FR2684247A1 (en) 1993-05-28
ES2040661A2 (en) 1993-10-16
SE9202352L (en) 1993-02-17
GB9217343D0 (en) 1992-09-30
NL193878C (en) 2001-01-03
FI923659A (en) 1993-02-17
CH688214A5 (en) 1997-06-13
BE1005584A5 (en) 1993-11-09
IE922590A1 (en) 1993-02-24
NL193878B (en) 2000-09-01
CA2076070A1 (en) 1993-02-17

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20010814