EP2737585A2 - Assemblage de conduit métallique - Google Patents

Assemblage de conduit métallique

Info

Publication number
EP2737585A2
EP2737585A2 EP12742933.0A EP12742933A EP2737585A2 EP 2737585 A2 EP2737585 A2 EP 2737585A2 EP 12742933 A EP12742933 A EP 12742933A EP 2737585 A2 EP2737585 A2 EP 2737585A2
Authority
EP
European Patent Office
Prior art keywords
tubular formation
metal
tubular
box
conduit assembly
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Withdrawn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
EP12742933.0A
Other languages
German (de)
English (en)
Inventor
Simon Brett HINLEY
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP2737585A2 publication Critical patent/EP2737585A2/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Withdrawn legal-status Critical Current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
    • H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
    • H02G3/02—Details
    • H02G3/06—Joints for connecting lengths of protective tubing or channels, to each other or to casings, e.g. to distribution boxes; Ensuring electrical continuity in the joint
    • H02G3/0616—Joints for connecting tubing to casing
    • H02G3/0691—Fixing tubing to casing by auxiliary means co-operating with indentations of the tubing, e.g. with tubing-convolutions
    • 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
    • H02G3/06—Joints for connecting lengths of protective tubing or channels, to each other or to casings, e.g. to distribution boxes; Ensuring electrical continuity in the joint

Definitions

  • the present invention relates to metal conduit assemblies for electrical installations.
  • Hitherto metal conduit assemblies for electrical installations have comprised metal tubing for interconnecting metal junction boxes or housings in which the components of the electrical installation are mounted.
  • the metal tubing is conventionally connected to the metal boxes or housings by screw threaded connections.
  • the thread on the tubing roust be formed in situ, which is a time consuming and messy operation.
  • the present invention provides a metal conduit assembly comprising a metal tube and a metal box or housing, the metal box or housing having one or more tubular formations extending through a wall of the box or housing, the tubular formation having a bore providing access to the box or housing, characterised in that the metal tube is a push fit in the bore of the tubular formation, a gripper ring being located adjacent the end of the metal tube engaging an end face of the tubular formation and a retaining sleeve member having an inwardly extending flange formation for engaging the gripper ring on the side remote from the end face of the tubular formation, means being provided for securing the retaining sleeve member to the tubular formation, the gripper ring being deformed to grip the metal tube.
  • the metal tube upon cutting the metal tube to length the metal tube is merely pushed into the bore of the tubular formation, there being no requirement to cut a thread in the end of the metal tube.
  • an elastomeric O-ring is provided about the metal rube between the end face of the tubular formation and the gripper ring, the O-ring being compressed by the retaining sleeve member to form a fluid tight seal between the metal tube and the tubular formation.
  • the retaining sleeve member is preferably secured to the tubular formation releasably, by for example a bayonet or screw arrangement, thereby permitting disassembly of the conduit assembly.
  • a permanent fastening for example the retaining sleeve member may be swaged over a circumferential projection on the outer circumference of the tubular formation.
  • the tubular formation may be formed integrally of the box or housing or may be secured to the box or housing by suitable means, for example a screw threaded fastening.
  • the box or housing may form a tubular junction between two tubular formations of equal or different diameter, whereby two lengths of metal tube may be connected together.
  • the box or housing is formed by die casting using a zinc alloy.
  • the box or housing may be pressed in parts from steel and the parts welded together, sand cast from iron or steel or machined from solid stock.
  • Figure 1 shows in plan view a metal conduit assembly in accordance with the present invention
  • Figure 2 shows a sectional side elevation of the conduit assembly shown in figure 1;
  • Figure 3 shows an exploded view of the conduit assembly shown in figure 1 ;
  • Figures 4 and 5 are views similar to figures 1 and 2 respectively, showing a modification to the conduit assembly shown in figures 1 to 3;
  • Figures 6 and 7 are views similar to figures 1 and 2 respectively. showing an alternative modification to the conduit assembly shown in figures 1 to 3;
  • Figure 8 is an isometric view of an alternative embodiment of the invention.
  • Figure 9 is a sectional side elevation of a further embodiment of the invention.
  • Figures 1 to 3 show a metal junction box 10 having a circular base 12 and an annular side wall 14.
  • the top of the junction box 10 is open but may be closed by a circular metal plate (not shown) which is secured in place by screws which engage a pair of screw threads provided in lugs 16 formed at diametrically opposed locations integrally of the side wall 14.
  • a rubber gasket (not shown) may be located between the open end of the side wall 14 and the metal plate, to provide a fluid tight seal.
  • a tubular formation 20 extends radially from the side wall 14 of the box 10, the bore 22 of the tubular formation extending through the wall 14 of the box 10 to provide access to the box 10 for a cable.
  • the bore 22 of the tubular formation is a plain cylindrical bore, the diameter of the bore 22 reducing at the end opening into the box 10 to form a shoulder formation 24.
  • a metal conduit pipe 30 is a push fit within the bore 22 of the tubular formation 20 from the end of the bore 22 remote from the box 10, the external diameter of the pipe 30 being greater than the internal diameter of the smaller diameter of the bore 22, so that abutment of the shoulder formation 24 by the end of the pipe 30 will limit movement of the pipe 30 into the bore 22.
  • An elastomeric O-ring 32 and gripper ring 34 are located around the end of the pipe 30 inserted into the tubular formation, the O-ring 32 being located between the end face 36 of the tubular formation 20 remote from the box 10 and the gripper ring 34.
  • the O-ring 32 and gripper ring 34 are compressed against the end face 36 by a retaining sleeve member 40.
  • the sleeve member 40 has an internal diameter corresponding to the external diameter of the tubular formation 20.
  • a flange formation 42 extends inwardly from on end of the sleeve member 40 to engage the gripper ring 34 on the side opposite to the O-ring 32, the internal diameter of the flange formation 42 being greater than the external diameter of the pipe 30.
  • a pair of diametrically opposed detent formations 44 are formed in the wall of the sleeve member 40 adjacent the end remote from the flange formation 42, by pressing tabs formed in the wall of the sleeve member 40 inwardly.
  • the detent formations 44 are engaged with diametrically opposed L-shaped recesses 46 in the outer surface of the tubular formation 20, in bayonet manner, to compress and retain the O-ring 32 and gripper ring 34 against the end face 36 of the tubular formation 20.
  • the gripper ring 34 comprises a conical washer with a series of resilient tooth formations SO extending inwardly from a continuous annular portion 52.
  • the diameter of the tips 54 of the of the tooth formations 50 is less than the external diameter of the pipe 30 while the internal diameter of the continuous annular portion 52 is greater than the external diameter of the pipe 30, when the gripper ring 34 is compressed against the O-ring 32 by sleeve member 40.
  • the tooth formations 50 are inclined inwardly towards the tubular formation 20, so that on insertion of the pipe 30, the teem formations 50 will be resiliently deflected by the pipe 30 and resiliently engage the pipe 30 to prevent subsequent removal of the pipe 30, movement of the pipe 30 outwardly increasing the grip of the gripper ring 34 on the pipe 30.
  • the sleeve member 40 may be disengaged from the bayonet fastening 44,46, to release the pipe 30 together with the O- ring 32 and gripper ring 34.
  • the O-ring 32, gripper ring 34 and sleeve member 40 are pre-assembled on the junction box 10, the O-ring being compressed to a required degree to sealingly engage the outer circumference of the pipe 30.
  • the conduit pipe 30 is then pushed into the assembly to make the joint.
  • the O-ring 32, gripper ring 34 and sleeve member 40 may be located about the pipe 30 before the pipe 30 is inserted into the bore 22 of the tubular formation 20. After inserting the pipe 30 into the bore 22, the sleeve member 40 may then the fastened to the tubular formation 20 by the bayonet connection 44, 46, to compress the O-ring 32 into sealing engagement with the pipe 30 and end face 36 of the tubular formation 20 and to tighten the gripper ring 34 against the pipe 30, by flattening the tooth
  • junction box 10 having a single tubular formation 20
  • the invention is applicable to junction boxes with multiple tubular formations 20, which may extend radially or non-radially from the wall 14 or base 12 of the box 10.
  • the invention is applicable to non-circular boxes, for example square or rectangular boxes for housing components of an electrical wiring installation.
  • detent formations may be provided on the tubular formation 20 for engagement of L-shapes recesses pressed in the wall of the sleeve member 40.
  • the sleeve member 40 may be secured to the tubular member by interengaging screw thread formations 60,62; screw thread formation 60 being provided on the internal surface of sleeve member 40 and screw thread formation 62 being provided on the external surface of the tubular formation 20.
  • the outer surface 64 of sleeve member 40 is knurled to provide a grip for tightening the sleeve member 40 on the tubular formation 20.
  • the L-shaped recesses 46 are replaced by an annular recess 70 spaced inwardly of the outer end 36 of the tubular formation 20.
  • the sleeve member 40 is permanently secured to the tubular formation 20 by assembling the sleeve member 40 on the tubular formation 20, so that the O-ring 32 and gripper ring 34 are located against the end face 36, and then pressing the detent formations 44 inwardly so that they engage to outer wall 72 of the recess 70.
  • the sleeve member 40 may be permanently secured to the tubular formation 20 by, for example welding, braising or the use of an adhesive. Permanently securing the sleeve member 40 to the tubular formation 20 in the manners described above does have the drawback that the pipe 30 would not be readily removable from the tubular formation 20.
  • the tubular formations 20 are formed integrally of the box 10.
  • the tubular formation 20 may be formed separately from the box or housing 10.
  • the tubular formation 20 is provided with an externally threaded tubular extension 80, which extends coaxially of the tubular formation 20, from the end thereof remote from the end in which the tube 30 is inserted.
  • a hexagonal flange formation 82 extends outwardly from the tubular formation 20 at the junction with the tubular extension 80.
  • the externally threaded tubular extension 80 may extend through an aperture in a wall of the box or housing 10, a nut engaging the thread of the tubular extension 80 to secure the tubular formation 20 in place.
  • the treaded tubular extension 80 may engage an internally threaded inlet socket of a conventional metal conduit box. While this embodiment has been illustrated using the gripper ring 34 and seal 32 assembly illustrated in figures 1 to 3, gripper ring and seal assemblies as illustrated in the other embodiments may alternatively be used.
  • the box or housing 90 defines a junction between two tubular formations 20, 20' .
  • two tubes 30, 30' may be connected together.
  • figure 9 shows a gripper ring 34 and seal 32 assembly as disclosed in detail with reference to figures 1 to 3, the gripper ring and seal assembly may be as disclosed with reference to any of the embodiments of this invention.
  • the tubular formations 20, 20* are of the same diameter.
  • tubular formations of different diameter may be provided to accommodate tubes 30, 30' of corresponding diameter.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Joints With Pressure Members (AREA)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)

Abstract

L'invention concerne un assemblage de conduit métallique comprenant un tube métallique et une boîte ou un boîtier doté d'une ou de plusieurs structures tubulaires s'étendant à travers une paroi de la boîte ou du boîtier, la structure tubulaire présentant une ouverture centrale traversante donnant accès à la boîte ou au boîtier, le tube métallique étant assemblé par emmanchement à force dans l'ouverture de la structure tubulaire, une bague de retenue adjacente à l'extrémité du tube métallique venant en contact avec une face frontale de la structure tubulaire, et avec un manchon de fixation doté d'un rebord dirigé vers l'intérieur destiné à venir en contact avec la bague de retenue du côté opposé à la face d'extrémité de la structure tubulaire, des moyens permettant de fixer le manchon de fixation sur la structure tubulaire étant en outre prévus, la bague de retenue étant déformée de manière à retenir le tube métallique.
EP12742933.0A 2011-07-28 2012-07-16 Assemblage de conduit métallique Withdrawn EP2737585A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB201113058A GB201113058D0 (en) 2011-07-28 2011-07-28 Metal conduit assemblies
PCT/GB2012/000597 WO2013014404A2 (fr) 2011-07-28 2012-07-16 Assemblage de conduit métallique

Publications (1)

Publication Number Publication Date
EP2737585A2 true EP2737585A2 (fr) 2014-06-04

Family

ID=44676381

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12742933.0A Withdrawn EP2737585A2 (fr) 2011-07-28 2012-07-16 Assemblage de conduit métallique

Country Status (3)

Country Link
EP (1) EP2737585A2 (fr)
GB (1) GB201113058D0 (fr)
WO (1) WO2013014404A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2534965B (en) * 2015-10-16 2017-02-15 Luxonic Lighting Plc Housing for an electrical connection

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB576573A (en) * 1944-02-21 1946-04-10 Francis Cecil Turner Improvements in cable or conduit joints, or in connecting cables or conduits to junction boxes and the like
GB2350656B (en) * 1999-04-07 2003-04-23 Polypipe Plc Conduits
US7504582B1 (en) * 2005-04-18 2009-03-17 Teh-Tsung Chiu Retaining joint for fixing cable
US8056938B2 (en) * 2009-04-16 2011-11-15 Royal Group Inc. Fitting for corrugated conduit

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2013014404A2 *

Also Published As

Publication number Publication date
WO2013014404A3 (fr) 2013-08-08
WO2013014404A2 (fr) 2013-01-31
GB201113058D0 (en) 2011-09-14

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