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
  • H02G3/26—Installations of cables, lines, or separate protective tubing therefor directly on or in walls, ceilings, or floors
  • H02G3/263—Installation, e.g. suspension, of conduit channels or other supports

Definitions

• the present invention relates to a method for installing trunking intended for accommodating electrical cable and like electrical conductors, for example telephone cables, on a wall or like supporting structure.
• the invention also relates to an arrangement with which the method can be carried out.
• the trunking may comprise one or more elongated thin-walled trunking or ducting sections, pref ⁇ erably of rectangular cross-sectional configuration.
• Trunking which comprises elongated trunking sections of rectangular cross-sectional profile is described and illustrated in Swedish Patent Specification No. 394057.
• Each trunking section is provided along one side thereof with two slots or channels which co-act with two mounting brackets when mounting the trunking sections on to a wall.
• the brackets are U-shaped and, when mounted, present a web, which abuts the wall, and two legs, which extend outwardly from the wall, preferably horizontally, and which enter respective slots in the trunking sections, so as to hold said sections in position.
• Located on the opposite of respective trunking sections is an opening which is covered with a covering strip or panel, this strip being removed when placing the electric cables in the trunking.
• trunking sections The cheapest method of manufacturing such trunking sections is to extrude the sections from alu ⁇ minium or a plastics material, owing to the relatively complicated configuration of the cross-sectional profile of said sections, and in particular the mounting slots provided therein.
• Plastic trunking sections cannot be used, however, in those cases where the electric cables or like conductors enclosed in the trunking are required to be particularly well protected against fire, and although trunking made of aluminium offers an alternative in this respect, such trunking is often too expensive to consider. Consequent ⁇ ly, there is a need for less expensive trunking which satisfies the aforesaid demands on fire precaution. It has been found that trunking made of thin steel sheet satisfactorily meets this desideratum.
• the known method of installing the trunking and the mounting arrangement or devices associated therewith cannot be readily used in connection with trunking made of steel sheet.
• One reason for this is because it is necessary to shape the steel sheet trunking sections in a roll bending machine, which limits the possibility of producing a complicated cross-sectional configuration.
• the simplest method of mounting a sheet metal trunking section on a wall or like support structure is to use mounting brackets simil ⁇ ar to those mentioned above, and by first securing the brackets to the wall or like support structure and then nailing or screwing the trunking section to the support.
• the object of the present invention is to provide a sim ⁇ ple and reliable method for fitting trunking comprising one or more elongated trunking sections to a wall or like support, each trunking section being supported by at least two mounting brackets fitted to the wall in the longitudinal direction of the trunking.
• a further ob ⁇ ject of the invention is to provide a simple arrangement of devices with which the method of installation accord- ing to the invention can be carried out and which as ⁇ sists in eliminating the aforementioned disadvantages.
• the arrangement is characterized by a support bracket which when installing a trunking section is temporarily fitted on a respective one of two mounting brackets which are spaced apart at a distance shorter than the length of said section, and in that each support bracket has a support section which extends substantially horiz ⁇ ontally and outwardly from respective trunking section mounting brackets when fitting said trunking section to its respective mounting brackets.
• the support section of respective supporting brackets has at least one spacing section through which the support bracket is connected with the mounting bracket and through which the support section is brought into the position desired relative to the mounting bracket when fitting the support bracket thereto.
• the support section of respective support brackets is preferably provided with a relatively long spacing section at one end thereof and a shorter spacing section at the other end thereof, these spacing sections extending in mutually opposite directions in relation to the support section of the sup ⁇ port bracket.
• the fact that the two spacing sections are of mutually different lengths enables respective trunking sections to be arranged at two different levels in rela ⁇ tion to the mounting brackets, or enables the centre lines of two trunking sections located at mutually diff ⁇ erent heights to be placed on one and the same level in relation to the mounting brackets.
• the method of installation according to the invention is characterized by placing a trunking section on the sup ⁇ port sections of repective support brackets, with the front opening of said trunking section facing outwardly away from the mounting brackets and with the rear defining wall of the opening abutting the legs of the mounting brackets, and by securing the rear defining wall directly to the mounting brackets with the aid of self-penetrating screws at locations marked on the rear defining wall, which wall extends along the length of the trunking sec ⁇ tion.
• the work of mounting the trunking sections is therewith effected through the front openings of respect ⁇ ive sections, which openings can then be closed-off with a removeable front panel, which enables the opening to be re-exposed.
• each section can be placed on any of the two sides surrounding the rear defining wall while supporting against the support section of respective support brackets with the centre line of the support bracket still located on one and the same level in relat- ion to the mounting brackets.
• Each free end of the spacing sections of respective sup ⁇ port brackets is provided with an attachment plate which extends substantially parallel with the plane passing through the support section, and is intended to be in ⁇ serted into a corresponding T-groove, preferably prov- ided on the underside of the lowermost leg of the mounting bracket in the wall fitted position of the bracket.
• Each attachment plate has a screw-threaded hole into which a locking screw is screwed. When the support bracket is fitted onto the mounting bracket, the locking screw is tightened in a manner such that the end of the screw penetrates the hole and exerts a locking force on the bottom of the T-groove.
• the legs of the mounting brack- ets have specially formed free end portions onto which the trunking section is screwed.
• the web of the mount ⁇ ing bracket carrying the two legs is provided with screw holes for screwing the bracket to the wall.
• the mounting brackets are mounted on the wall in a known man- ner, for example by measuring up the locations of the attachment points and making any necessary adjustments with the aid of a spirit level, sighting line or some like levelling device.
• Figure 1 is a so-called exploded view of a trunking sec ⁇ tion intended to be mounted on a wall with the aid of two mounting brackets, the attachment of the trunking section to the mounting brackets being effected with the aid of two support or holding brackets which are intended to be fitted onto respective mounting brackets.
• Figure 2 is an enlarged view of a support bracket accord- ing to Figure 1.
• Figure 3 illustrates an end portion of the trunking sec ⁇ tion shown in Figure 1 placed on a support bracket, which in turn is fitted to a mounting bracket, the view being shown in the longitudinal direction of the trunking section.
• Figure 4 illustrates a trunking section as seen in the direction of its longitudinal axis, the trunking section being placed on a support bracket in readiness to be screwed to respective mounting brackets with the aid of self-drilling screws.
• Figure 5 illustrates an alternative trunking section, seen in the direction of its longitudinal axis, placed on a support bracket in a position in which the trunking section can be pre-drilled.
• Figure 6 illustrates mounting brackets which are fitted to a wall and the vertical height position of which can be adjusted with the aid of a levelling line.
• the installation trunking according to Figure 1 comprises an elongated trunking section 1 of rectangular cross-sec ⁇ tional configuration and presenting a front side 2 having provided therein a front opening 3 which can be closed and re-exposed with the aid of a front panel 4 , which is shown removed from the trunking section, and further pre- sents a rear wall or side 5 which is exposed to the front opening 3.
• Located on the inner surface of the rear wall 5 are attachment means for securing cable shelves within the trunking.
• Two mounting brackets 6 are intended to be fitted to a vertical wall with the aid of screws 7 , the mutual spacing between the brackets being shorter than the length of the trunking section 1.
• the mounting brac ⁇ kets 6 are intended to co-act with support or holding brackets 8 , on which the trunking section 1 can be placed and supported while securing said section to the mounting brackets 6.
• the support brackets 8 are intended to be removed from the mounting brackets 6 once the trunking section is secure.
• each support bracket 8 has a support section 9, which is provided with a layer of rubber in order to prevent damage to the surface of the trunking section 1 when said section rests on the support section 9.
• the support section 9 extends horizontally outwards from the mounting brackets 6 when the support brackets 8 are mounted thereon.
• the support section 9 is provided at one end with a relatively long spacing section 11 and at the other end with a shorter spacing section, the two spacing sections 10, 11 extend ⁇ ing in mutually opposite directions in relation to the support section 9. All sections 9, 10, 11 are made of flat steel bar bent at right angles at both ends so as to form the spacing sections 10, 11.
• each spacing section 10, 11 is provided at its free end with a respective att ⁇ achment plate 12 and extends parallel with the plane passing through the support section 9 and is intended to be inserted into a corresponding T-groove 13 provided on a lower leg 14 of a respective mounting bracket 6.
• the attachment plate 12 is provided with a screw-threaded hole 15 the axis of which extends at right angles to the plane and in which a locking screw 16 is intended to be screwed.
• each spacing section 10, 11 is provided along the length thereof with a central aperture in which the locking screw 16 is located when screwed into the hole 15 in the attachment plate 12.
• the mounting bracket 6 has a web plate 31, from which the lower leg 14 projects at right angles to the plane pass ⁇ ing through the plate.
• An upper leg 17, parallel with the lower leg 14, projects outwardly to the same dist- ance from the base or web plate 31 as the lower leg 14.
• Both legs 14, 17 present an attachment groove or slot 18, best seen from Figures 4 and 5.
• FIG 4 illustrates a trunking section 1 placed on the support section 9 of two support brackets 8, of which only one is shown in the Figure.
• the front opening 3 of the trunking section faces outwardly away from the mounting brackets 6, with the rear wall 5 of the trunking abutting the legs 14, 17 of the mounting brackets.
• the rear wall 5 of the trunking section is provided with markings in the form of drill weakenings 19, each of which consists of a depression in the form of a groove extending in the longitudinal dir- ection of the trunking section 1 on the inner surface of the rear wall 5.
• Respective drill weakenings 19 are sym ⁇ metrically arranged around the longitudinal centre line of the rear wall 5 at a mutual spacing equal to the mut ⁇ ual spacing between the attachment grooves 18 on the legs 14, 17 of the mounting brackets 6.
• the longer spacing section 10 on the support brackets 8 has a length adapted so that the support section 9 is located at the same distance from the attachment groove 18 in the lower leg 14 as the distance between the lower side 20 of the trunking section 1 and the nearest drill weakening
• the trunking section 1 Since the upper side 21 of the trunking section 1 is located symmetrically in relation to the lower side 20, the trunking section 1 can be turned through 180 such that the lower side 20 and the upper side 21 exchange places.
• the trunking section 1 is firmly screwed with the two self-drilling screws 22, illustrated schematical ⁇ ly prior to being inserted into respective mounting brac ⁇ kets 6, whereafter the support or holding brackets 8 are removed, by backing-off the locking screws 16.
• FIG. 5 illustrates an alternative method of installat ⁇ ion according to the invention, in which a trunking sect ⁇ ion 1 is placed on the support section 9 of a support bracket 8, with the rear wall 5 of the trunking section facing outwardly away from the mounting bracket 6.
• the rear wall of the trunking section is provided with drill weak ⁇ enings 19, although with the difference that in this case each drill weakening 19 comprises a groove formed by de ⁇ pressing the outer surface of the rear wall 5.
• two holes are drill ⁇ ed with the aid of a drill 23, illustrated schematically prior to attachment in the two intended positions at each mounting bracket 6.
• the trunking section 1 is turned about its longitudinal axis through 180 and screwed firmly in the mounting brackets 6 with the aid of screws 24, which are shown screwed into respective legs 14, 17 on the mounting brackets 6 of Fig- ure 3.
• the mounting brackets 6 When practicing the aforedescribed two alternative methods of installation the mounting brackets 6 are fitted to the wall in a known manner in accordance with the Figure 6 illustration, which also shows an alternative embodiment of the mounting brackets 6.
• the location of the mounting brackets 6, e.g. the positional location of the upper edge of said brackets, is determined, for example, in rel ⁇ ation to a floor surface or some element located in a hor ⁇ izontal position, and is marked on the wall with a pen, as is also the position of the brackets along the longitudin ⁇ al axis of the installation trunking.
• Holes for the mounting bracket attachment screws 7 are drilled at a given distance beneath respective markings, wherewith the one mounting bracket 6 is accurately aligned with a corresponding marking, by displacing the bracket with the screw 7 running in an adjustment groove or slot 24 pro- vided on the web plate 31, whereafter the screw is tight ⁇ ened.
• the adjustment groove 24 has provided at its low ⁇ er end an opening 25 having a diameter which is larger than the head of the securing screw 7.
• this mounting bracket corresponds to the right-hand mounting bracket 6.
• the left-hand mounting bracket 6 is only fitted provisionally to the wall.
• a line 26 having a weight 27 attached at both ends thereof is hung over the two mounting brackets 6 and adjusted to a horizontal level by adjusting the vertical height of the left-hand mounting bracket 6 , which when the line is horizontal is screwed firmly to the supporting wall.
• the positions of the mounting brackets 6 are then secured, if considered necessary, with the aid of fixing screws 28 placed in downwardly directed grooves 29 on respective mounting brackets.
• the mounting brackets 6 can be re ⁇ moved, through the agency of the downwardly directed grooves 29, by slightly loosening the screws 7, 28 so that the mounting brackets 6 can be moved upwardly.
• the alternative embodiment of the mounting brackets 6 illustrated in Figure 6 has both the T-groove 13 on its lower leg 14 and the attachment groove 18 on the two legs 14, 17.
• the upper side of the upper leg 17 is also prov ⁇ ided with attachment means 30 for decoration strips, not shown.
• the support or holding bracket according to the invention is not limited to the afore ⁇ described embodiments and that modifications can be made within the scope of the concept of the invention.
• the attachment plate 12 can be replaced by a later ⁇ ally open bifurcate device or stirrup-shaped device capable of being pushed onto the bracket leg 14 from one side and locked thereto with the aid of a stop groove. This elim ⁇ inates the need for a T-groove on the bracket leg.

Landscapes

• Engineering & Computer Science (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Installation Of Indoor Wiring (AREA)
• Telephone Set Structure (AREA)
• Connection Or Junction Boxes (AREA)
• Details Of Indoor Wiring (AREA)
• Connection Of Plates (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20360085

Family Applications (1)

Country Status (4)

Families Citing this family (6)

Family Cites Families (3)

• 1985
  • 1985-05-06 SE SE8502207A patent/SE453234B/sv not_active IP Right Cessation
• 1986
  • 1986-04-29 WO PCT/SE1986/000196 patent/WO1986006887A1/en not_active Application Discontinuation
  • 1986-04-29 EP EP19860902947 patent/EP0229079A1/de not_active Withdrawn
• 1987
  • 1987-01-05 DK DK003187A patent/DK157960B/da not_active Application Discontinuation

Non-Patent Citations (1)

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