EP0513065A1 - Traversee - Google Patents

Traversee

Info

Publication number
EP0513065A1
EP0513065A1 EP19910902874 EP91902874A EP0513065A1 EP 0513065 A1 EP0513065 A1 EP 0513065A1 EP 19910902874 EP19910902874 EP 19910902874 EP 91902874 A EP91902874 A EP 91902874A EP 0513065 A1 EP0513065 A1 EP 0513065A1
Authority
EP
European Patent Office
Prior art keywords
bushing
opening
junction box
bushing according
tongues
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
EP19910902874
Other languages
German (de)
English (en)
Inventor
William Sidney Broome
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.)
Grau Ltd
Original Assignee
Grau 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 Grau Ltd filed Critical Grau Ltd
Publication of EP0513065A1 publication Critical patent/EP0513065A1/fr
Ceased 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
    • H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
    • H02G3/02—Details
    • H02G3/08—Distribution boxes; Connection or junction boxes
    • H02G3/16—Distribution boxes; Connection or junction boxes structurally associated with support for line-connecting terminals within the box
    • 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
    • H02G3/08—Distribution boxes; Connection or junction boxes
    • H02G3/088—Dustproof, splashproof, drip-proof, waterproof, or flameproof casings or inlets

Definitions

  • This invention relates to a bushing for interposition between an elongate element, such as an electrical conductor or a conduit therefor, and an opening in a fitting, such as a junction box.
  • such a bushing has comprised a tubular body having a central passage to receive an elongate element and a gland to provide a seal between the element and the bushing and, at one end of the body, an externally screw threaded spigot adapted to be threadedly received in a screw threaded opening provided in the fitting.
  • An object of the present invention is to provide a new and improved bushing.
  • a bushing comprising a tubular body having a central passage to receive an elongate element, a gland to provide a seal between the elongate element and the bushing and, at one end of the body, means adapted to inter-engage with an opening in a fitting to attach the bushing to the fitting.
  • Said means may comprise a plurality of tongues which project from said one end of the body generally parallel to a central longitudinal axis of said passage and which are adapted to inter-engage with said opening.
  • Each tongue may be provided with an abutment surface which extends generally transversely relative to said axis to engage a co-operating retaining part of the fitting.
  • Each tongue may be resiliency deformable inwardly towards said axis to enable passage of said abutment surface into said opening from a first end towards a second end and subsequently to move outwardly away from said axis for attaching relationship with said retaining part.
  • each tongue has an inclined surface which extends from a position adjacent the radially outermost part of said abutment surface in a direction which is inclined inwardly and towards the free end of the tongue.
  • each tongue has- a manually engageable extension which projects beyond said abutment surface to permit of manipulation of the tongues radially inwardly to permit of displacement of said abutment surface out of radial alignment with said retaining part to permit of removal of the bushing.
  • the body may be provided with an abutment for engagement by a resilient member which is adapted to engage with an abutment of the opening so as normally to bias the body in a direction to urge said abutment surface and retaining part into engagement.
  • the body may be provided with a portion which extends into said opening between said tongues and which is of such configuration so as to prevent engagement between said elongate element and said opening.
  • a pair of diametrically opposite tongues are provided.
  • the body may be screw threaded to receive a nut member and said gland being movable into sealing engagement with the elongate element by tightening of the nut member relative to the body.
  • the bushing may be screw threaded at the opposite end thereof to said means.
  • junction box having at least one opening therein in which a bushing according to the first aspect of the invention is engaged.
  • a seal member may be provided in sealing engagement between the bushing and the opening.
  • the resilient member may provide said seal member.
  • the junction box has a lid which carries a plurality of first electrical connectors and said elongate elements comprising electrical conductors each of which is provided with a second connector to mate with the first connectors provided on the lid.
  • the first connectors provided on the lid may be electrically connected to electrical components mounted on the lid.
  • FIGURE 1 is a plan view of a junction box embodying the invention shown in an open condition and partly in section,
  • FIGURE 2 is a longitudinal partial cross-section through the box of Figure 1 but with the lid in a closed condition.
  • FIGURE 3 is an end elevation of the body of the bushing of Figures 1 and 2,
  • FIGURE 4 is a section on the line 4-4 of Figure 3 but showing the body in position in an opening of the box of Figures 1 and 2,
  • FIGURE 5 is a section on the line 5-5 of Figure 3.
  • FIGURE 6 is a section on the line 6-6 of Figure 4.
  • a junction box is indicated clearly at 10 and comprises a base part 11 which may be, and in this example is, pivotally connected in conventional manner to a lid 12.
  • the lid 12 carries a plurality of electrical components of any desired type for the application concerned and the electrical components are provided with a plurality of first connectors 13 of conventional type.
  • a plurality of second connectors 14 are engaged therewith and are connected to the ends of electrical conductors 15 which pass through openings 16 in a side wall 17 of the base part 11 of the junction box 10.
  • the box has twelve openings, arranged in two rows of three opemngs on each of two opposite sides of the box, and twelve first connectors 13.
  • Figure 1 for clarity only the top rows and associated conductors are shown in Figure 1 and some second connectors and associated conductors have been omitted from Figure 2.
  • the openings 16 are in the form of generally cylindrical bosses 18 which project inwardly from the wall 17 into the interior of the junction box and each port 19 thus provided is identical.
  • Received within each port is a bushing 20.
  • Each bushing 20 comprises a body 21 best shown in Figures 3 to 6 and the bodies are essentially similar except that they may be provided either with an external screw thread as shown at 22 on the left-hand side of Figure 2, or an internal thread as shown at 23 on the right-hand side of Figure 1.
  • the body shown in Figures 3 to 6 has an external screw thread as shown at 22 and the body 21 is generally cylindrical having a stepped axially extending passage 24 therethrough and a reduced diameter part 25 which is provided with the external screw thread 22.
  • the body 21 has a circumferentially extending groove 26 of generally square configuration provided therein to receive an 0-ring seal 27 adapted to engage a shoulder 28 of the port 19.
  • a pair of diametrically opposite tongues 30 project from an end surface 31 of the body via a reduced cross-section neck part 30a and tongues 30 each have a radially outwardly extending abutment surface 32 for engagement with a retaining part comprising a surface 35 provided by an inner end surface 18a of the boss 18, whilst an inclined surface 33 extends inwardly and towards the free end 34 of the tongues 30 from a position adjacent the radially outer end of the surfaces 32.
  • a manually engageable portion 36 which can be gripped between, for example, the thumb and first finger of a user to enable the tongues to be deformed inwardly towards each other to enable the abutment surfaces 32 to be moved radially inwardly so as to be radially out of alignment with the retaining surfaces 35.
  • guard portions 40 are adapted to extend through the port so as to be disposed between the conductors 15 and the wall of the port and so as to prevent engagement therebetween. If desired the guard portions may be omitted.
  • an internally threaded nut member 50 is engaged with the screw thread 22 and has an inwardly directed flange 51 by which a resiliently deformable gland 52 is clamped between the flange 51 and the end surface 53 of the body 21 and thus deformed radially into sealing engagement between the nut member 50 and a conduit 54 surrounding the electrical connector.
  • an externally threaded nut member 60 is provided which can act on a member 61 to urge a gland 62 against a shoulder 63 provided between the larger and smaller diameter parts of the internal passage 24 of the body 21 and thus cause the gland to be deformed into sealing engagement with the body, nut and conductor.
  • an electrical conductor or associated conduit is brought into sealing relationship with the bushing, by tightening of the nut member 50 or 60, prior to assembly.
  • the bushings may be thus assembled to the conductors during manufacture and the connectors 14 are fastened to the conductors so that an appropriate length of conductor is left between the bushing and the connector.
  • a connector 14 is passed through a desired port 19, the port being of appropriate size to permit such passage and then the connector can be manually engaged with an associated connector 13 on the lid.
  • the bushing is then inserted into the port from a first end 18b thereof externally of the box 10 towards a second inner end 18 ⁇ thereof internally of the box.
  • the tongues 30 are displaced as a result of their inherent resilience inwardly towards each other as a result of engagement of the inclined surfaces 33 with the internal surface of the port 19 so as to permit the outer end of the abutment surface 32 to pass through the port into axial alignment with the retaining surfaces 35 whereupon the tongues can snap outwardly as a result of their inherent resilience into attracting relationship with the retaining surfaces 35.
  • the 0-ring seal 27 and the associated surfaces of the groove 26 and shoulder 28 are dimensioned so that the 0-ring is compressed when the abutment and retaining surfaces 32, 35 are in attaching relationship so that the 0-ring 27 serves normally to provide a resilient bias to maintain the abutment and retaining surfaces 32, 35 in engagement and thus provide a secure attachment without free movement between the port and bushing.
  • the O-ring 27 also acts as a seal between the part 19 and the bushing 20.
  • the seal may be provided by engagement between the outside diameter of the O-ring 27 and the wall of the part 19 and/or the shoulder 28 and the inside diameter of the 0-ring and the base and/or a side wall or the side walls of the groove 26.
  • the above described pre-assembly of the bushing to the cable may be provided.
  • the tongues are disposed within the junction box and can only be displaced inwardly towards each other by manual engagement of the part, 36 thereof, it is not possible to remove the bushing from externally of the junction box, thereby providing a "tamper-proof facility.
  • the tongues are disposed within the fitting, i.e. junction box, they are protected from the element and from ultra-voilet light and therefore degradation of the plastics material of which the body is made, which is, for example, nylon 6, is avoided. It should, however, be appreciated that the bushing may be made of any suitable material which provides a desired degree of inherent resilience to the tongues.
  • the port of the fitting does not require machining to provide a screw thread and sufficient accuracy in the shape of the port can be achieved as a result of moulding of the junction box by a suitable manufacturing technique (for example pressure die casting using aluminium alloy), thereby avoiding the need to perform any machining operation on the ports.
  • the fitting and the port are provided with inter-engaging means to permit the bushing to be received in the port in only a single orientation, for example with the tongues horizontal so as to present the tongues in a most convenient orientation for a user to be able to manually move them towards each other for removal of the bushing.
  • the above described means may comprise a radially outwardly projecting lug on the body 21 receivable in a corresponding recess in the housing.
  • Bushings as described hereinbefore are made in a desired range of sizes to fit a desired range of cable diameter and conduit diameter and appropriate glands are provided.
  • two types of gland have been described but if desired any other form of gland may be provided by forming the body 21 appropriately to receive the gland and its tightening assembly, although, of course, the remainder of the body including the tongues remains as described above.
  • the different types of bushings may be distributed as desired between the ports of the junction box.
  • Bushings embodying the present invention may be used with ports of any desired fitting.
  • the bushing may be used in a conventional manner by appropriate tightening or untightening of the nut member 50, 60 with the bushing remaining attached to the fitting.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Connection Or Junction Boxes (AREA)
  • Sealing Devices (AREA)

Abstract

On décrit une traversée comprenant un corps tubulaire à passage central destiné à recevoir un élément allongé, une garniture pour assurer l'étanchéité entre l'élément allongé et, à l'une des extrémités du corps, un moyen conçu pour coopérer avec une ouverture dans un support et permettant de fixer la traversée audit support.
EP19910902874 1990-01-30 1991-01-29 Traversee Ceased EP0513065A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB909002021A GB9002021D0 (en) 1990-01-30 1990-01-30 Bushing
GB9002021 1990-01-30

Publications (1)

Publication Number Publication Date
EP0513065A1 true EP0513065A1 (fr) 1992-11-19

Family

ID=10670094

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910902874 Ceased EP0513065A1 (fr) 1990-01-30 1991-01-29 Traversee

Country Status (3)

Country Link
EP (1) EP0513065A1 (fr)
GB (2) GB9002021D0 (fr)
WO (1) WO1991011839A1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3285551A (en) * 1965-05-13 1966-11-15 Teleflex Inc Conduit support assembly
EP0106001A1 (fr) * 1982-10-13 1984-04-25 GebràœDer Sulzer Aktiengesellschaft Procédé de raccordement des gaines pour câbles à une armoire de distribution p.ex. d'une machine à tisser et dispositif pour la mise en oeuvre du procédé
GB2219697B (en) * 1988-04-13 1993-02-24 Cmp Improvements in cable glands
AU4141289A (en) * 1988-09-15 1990-03-22 Westward Investments Limited Electrical cable gland

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9111839A1 *

Also Published As

Publication number Publication date
GB9002021D0 (en) 1990-03-28
WO1991011839A1 (fr) 1991-08-08
GB9215307D0 (en) 1992-09-23
GB2256327B (en) 1994-05-11
GB2256327A (en) 1992-12-02

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Legal Events

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

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