CA1107934A - Electrified ceiling system - Google Patents
Electrified ceiling systemInfo
- Publication number
- CA1107934A CA1107934A CA340,505A CA340505A CA1107934A CA 1107934 A CA1107934 A CA 1107934A CA 340505 A CA340505 A CA 340505A CA 1107934 A CA1107934 A CA 1107934A
- Authority
- CA
- Canada
- Prior art keywords
- side walls
- ceiling structure
- flanges
- box
- ceiling
- 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.)
- Expired
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B9/00—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation
- E04B9/06—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation characterised by constructional features of the supporting construction, e.g. cross section or material of framework members
- E04B9/065—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation characterised by constructional features of the supporting construction, e.g. cross section or material of framework members comprising supporting beams having a folded cross-section
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B9/00—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation
- E04B9/06—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation characterised by constructional features of the supporting construction, e.g. cross section or material of framework members
- E04B9/064—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation characterised by constructional features of the supporting construction, e.g. cross section or material of framework members comprising extruded supporting beams
-
- 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
- H02G3/28—Installations of cables, lines, or separate protective tubing therefor in conduits or ducts pre-established in walls, ceilings or floors
- H02G3/281—Installations of cables, lines, or separate protective tubing therefor in conduits or ducts pre-established in walls, ceilings or floors in ceilings
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Installation Of Indoor Wiring (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A suspended ceiling comprising a grid-like structure formed from interconnected longitudinal and transverse channel members defining open spaces in which ceiling panels, lighting troffers, air supply fittings and the like can be removably supported. Electrical supply cables are provided in at least some of the longitudinal channel members, for the distribution of electricity to lighting fixtures or the like. The channel members extend below the plane of the ceiling and provide the appearance of a coffered ceiling. Electrical connection boxes are releasably attached to the channel members at intervals, for connection of lighting and power fixtures.
A suspended ceiling comprising a grid-like structure formed from interconnected longitudinal and transverse channel members defining open spaces in which ceiling panels, lighting troffers, air supply fittings and the like can be removably supported. Electrical supply cables are provided in at least some of the longitudinal channel members, for the distribution of electricity to lighting fixtures or the like. The channel members extend below the plane of the ceiling and provide the appearance of a coffered ceiling. Electrical connection boxes are releasably attached to the channel members at intervals, for connection of lighting and power fixtures.
Description
i~)793~ ~
BACKGRO[1ND OF TH~ INVENTI ON
The present invention relates generally to ceiling structures and more particularly to a ceiling structure of the type which comprises a grid of supporting strut members for supporting lighting fixtures, air handling outlets, ceiling panels and the like.
The arrangement of electrical wiring conduits in office and light industrial buildings varies considerably. For example, such ducts are sometimes laid in the flooring or in the air space between the ceiling and the next upwardl~
adjacent floor.
In order to achieve maximum flexibility in the use and partition of such office, lighting industrial space and commercial space, it is desirable that the wiring be capable of being arranged across the space in parallel lines with provision for tapping into the electrical conduits at various points as may be required from time to time.
Various systems have heretofore been proposed for satisfying ~hese objectives.
However, such known systems have suffered from a variety of defects, being either undul~ complex or expensive or, in some cases, failing to provide for the facility for maximum electrical wiring distribution in the most efficient and economical way.
The erection of a suspended ceiling in such commercial, office or industrial space often employs a rectangular grid of supporting struts suspended from the floor above. Ceiling panels, lighting fixtures and air handling facilities are also incorporated in or supported on such a grid. In some cases, electrical services, conduits and the like have been located in the space il~lL~7~34 between such a ~eilin~ qrid, and the Eloor above. Electrical services are then led through the ceiling to the working area , below by vertical posts or columns.
This known system permits a highly flexible and convenient electrical distribution system but results in a complex network of wires, conduits, air ducts and the like, occupying the limited space between the ceiling and the floor above.
In addition installation and servicing of facilities in such a limited space involves various trades which may some-times cause difficulty.
SUMMARY OF THE INVENTION
.. . _ .. . .
The present invention seeks to combine the function of a ceiling strut grid with that of electrical distribution in a single ceiling structure.
~ Broadly a ceiling structure in accordance with this inven-- tion comprises a plurality of mutually parallel, mutually spaced apart, hollow longitudinal members a plurality of transverse members, ~ terminally connected by junction means to said longitudinal ; 20 members and extending therebetween to form a grid-like structure including open spaces, and said longitudinal members being adapted to receive insulated electrical cables within at least some of said longitudinal members, and electrical connec-tion boxes releasably attached on top of the longitudinal members, whereby electrical connections may be made at various locations in the ceiling.
In accordance with a preferred feature of this inven-tion, a ceiling structure in accordance therewith is provided with a plurality of electrical receptacle fittings and fastener means for fastening such receptacles in position on the longitudinal .~' i7~34 members at spaced intervals therealong.
In accordance with another features of this invention, a ceiling structure in accordance therewith may be sombined with vertically extending electrical supply posts extending down-wardly to the floor from the ceiling and provided with electrical outlets so to provide for electrical distribution in the working space beneath the ceiling.
The various features of novelty which characterize the inv~ntion are pointed out with particularity in the claims annexed to and forming a part of this disclosure. For a better understanding of the invention, its operating advantages and specific objects attained by its use, reference should be had to the accompanying drawings and descriptive matter in which there are illustrated and described preferred embodiments of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
_ The invention will now be described merely by way of illu~tration in the accompanying drawings in which:
Figure 1 is a fragmentary and somewhat schematic per-spective view from above of one embodiment of a ceiling structureaccording to the invention, and showing various optional features provided pursuant to preferred features of this invention;
Figure 2 is an exploded and fragmentary perspective view of two longitudinal members forming part of the ceiling structure shown in Figure;
Figure 3 is an enlargsd exploded perspective view showing one systçm for interconnecting th~ longitudinal and transverse members of the ceiling structure shown in Figure l;
Figure 4 is an enlarged exploded and fragmentary per-spective view showing how an electrical junction box can be mounted on a ~ struct~lre accorAins to the invention, and, Figure 5 is a cut-away perspective of a detail of Figure 3.
DESCRIPTION OF THE PREFERRED ~MBODIMENT
. .
Referring first to Figure 1, it will be seen that the invention is illustrated therein as comprising a rectangular grid-like structure generally indicated at 8 for supporting a ceiling. Known rectangular grid type ceilings have in the past usually comprised simple T~shaped strut members for supporting ceiling panels, accoustic panels, lighting fixtures, air handling fixtures and the like.
In the present in~ention, similar ceiling panels or accoustic panels illustrated as P are shown for closing off the openings in the grid-like structure. In addition, two lighting fixtures indicated at F in ~he form of fluorescent lighting troffers are also shown.
While specific air handling fixtures such as inlets, outlets, duct work and the like are not shown, it will of course be appreciated and well understood by those in the art that such fixtures can readily be placed in position, as desired, in the ceiling structure 8 in generallv the same way as in known forms of rectangular grid type ceilings.
Th,e ceiling structure 8 comprises mutually spaced apart longitudinal members or struts 10 and mutually spaced apart transverse members or struts 12 terminally secured to the longi-tudinal struts 10 to form a grid-like structure including the aforementioned openings. The ceiling structure 8 is supported from an overhead structure at suitably spaced intervals by means such as the support wires indicated at 14.
In accordance with well known practice, the support 1~7~34 wires 14 are attached to any suitable portions of the building fabric typically to the underside of the floor above (not shown).
Referring now in more detai.l to Figure 2, it will be seen that two of the longitudinal struts 10 are show~ therein in exploded or spaced apart relationship.
Each of such struts 10 will be seen to comprise a generally hollow tubular section of sheet metal having a flat bottom wall 16 (Figure 3), vertical and flat side walls 18, and two partial horizontal top wall portions 20.
Spaced apart and upwardly extending flanges or lips 22 are formed along the free or inner edges of the top wall portions 20~
Mechanical connection of the ends of adjacent lengths ~ of the struts 10 is achieved by means of sheet metal junction .: plat~ members 24 which are fastened to the struts 10 by any : suitable means such as sheet metal screws or rivets 25 as shown.
It is to be noted that the junction plate members 24 are omitted from Figure 1 and 4.
The junction plates 24 are formed along their side edges with flanges 26 for attachment of the transverse struts 12 in the manner yet to be described. It is to be noted that the free edges of the flanges 26 are positioned outwardly of the side : walls 18.
Electrical ground continuity between adjacent ones of the longitudinal struts 10 is provided by means of tongue members 28 which are spot welded to one end of each such longitudinal strut 10 so as to extend longitudinally therefrom. Each such tongue member 28 has a width which is less than the interior width of the strut 10 so that it will fit between the side walls 18 of an adjacent strut 10 as will be readily understood from ~37934 Figure 2.
The ton~ue members 28 are provided with suitable electrical fastening means such as a bolt 30 to which ground wires G are attached for a reason yet to be explained.
Suitable electrical plug-receiving receptacles generally indicated at 32 are also usefully provided. Each such receptacle 32 comprises a face plate 34, an electrical plug-receiving portion 36 mounted in the face plate 34 and a plurality, in this case, four spring steel leg portions 38.
The legs 38 are dimensioned so as to make a snap-fit between the upstanding lips 22 of the top wall portions 20 and to ground the cover plates 34 to the struts 10. The ground terminals of the plug-receiving portions 36 are connected by the ground wires G to a respective one of the bolts 30.
In accordance with the invention, the longitudinal struts 10 are provided with a suitable decorative exterior coating such as paint or the like on their outwardly directed surfaces but their inwardly directed surfaces, at least along the ~ -opposed faces of the lips 22, are left free of any coating which would inhibit good electrical contact between such lips 22 for example and the aforementioned legs 38.
Wiring harnesses H (Figure 2) are laid within at least some of the longitudinal struts 10 to supply electrical power to the receptacles 32. To facilitate the introduction of such harnesses H the longitudinal struts 10 are provided with removable cover plates ~0 which are provided in turn, with a plurality of spring legs 42 depending downwardly therefrom at suitably spaced intervals therealong for holding them in position on the longi-tudinal struts 10.
The cover plate members 40 may be made in different _ 7~34 lengths and may~ for example, be made with weakened portions at predetermined spaced points therealon(~ so that they may be readily broken off to desired lengths to fit any particular modular arrangement.
It will be seen from Figure 3 that the strut 10 shown therein is supported by means of the wire 14 which is attached to a narrow strap 44 extending across the width of the interior of the strut 10 between its side walls 18, and fastened in position by any suitable means such as by the same rive,ts (not shown) which secure the ~unction plate 24 in position ox by separate rivets 45 as shown in Figure 4.
One of the tran~verse struts 12 is shown in more detail in Figure 3, from which it will be seen that it comprises a bottom wall 16, side walls 18 and top wall portions 20 with lips 22, in the same manner as the longitudinal struts 10.
For joining the ends of transverse struts 12 at right angles to the longitudinal strut~ 10, end connectors 46 are secured to the interior surfaces of the side walls 18 of the transverse struts 12 by any suitable means, for example, by spot 2Q welding or the like. ~he connectors 46 are formed with connector ribs 47 which are arranged to make a sliding interfitting engage-ment with the edge flanges 26 on the junction plate 24 and are locked in assembled position by means of locking clips 48 formed on the flanges 26 and interlocking with holes 49 provided in the members 46.
Once assembled in the form of the grid as shown in Figure 1 and with that grid suspended in position, ceiling panels or accoustic panels P may simply be laid on the top surfaces of the top wall portions 20 of the struts 10 and 12 generally in edge abutment with the flanges 22.
L)epending on the size and shape of such ceiling panels P, additional dummy struts S (Figure 1) may be secured between adjacent struts 10 or 12 to support such panels.
Similarly, lighting troffer fixtures F may simply be laid in position longitudinally or transversely with ceiling panels laid on either or both sides thereof in accordance with well known practice. In the same way, air handling fixtures may also simply be laid so that they rest upon the top wall portions 20 of the struts 10 and 12. Usefully, the open spaces between adjacent pairs of the longitudinal and transverse struts 10 and 12 respectively are square in plan so facilitating the positioning of a lighting troffer fixture F in either direction.
Usefully, the electrical power harnesses H are arranged in the longitudinal struts 10 so that they eXtend from one side to the other of the ceiling thereby providing for a fully flexible system of electxical distribution throughout a given building space.
Electrical power may be supplied to such harnesses ~ by electrical cables C terminating at connection boxes 50 ~Figure 4).
Such connection boxes 50 will be of any suitable sheet metal construction having side walls 52, end walls 54 and a removable top cover 56. Suitable knock outs 58 may be provided for introduction of the wiring in a conventional manner.
Each connection box 50 has an open base, the lower edges of its side walls 52 being spaced apart a distance such that they will fit snugly around the outer faces of the upstanding flanges 22 of the struts 10.
The end walls 54 of the boxes 50 are dimensioned so that they can extend downwardly between such flanges 22, and so that the aforem~ntioned cover plates 40 will thus abut against 7~34 the outer faces of the end w~lls 54 so -to provide a completely closed off system.
Notches 60 are formed between the lower portions of the side walls 52 and the end walls 54 so as to permit the former to straddle the upstanding flanges 22 in the manner described.
Within the connection box 50, there is provided a mounting plate 62 which is spot welded or fastened in any other suitable manner to the inner faces of the side walls 52.
A mounting screw 64 extends do~nwardly from the plate 62 and is threaded into an oversize locking plate 66 which has an elongated rectanqular shape, its narrower dimension being such that it will fit between the lips 22, and can then be rotated (arrows A) so as then to underlie the top wall portions 20 of the struts 10. Consequently, when the screw 64 is tightened, it will clamp the connection box S0 to the strut 10. A ground wire G
ensures ground continuity between the connection box 50 and the strut 10.
In order to simplify installation of lightinq fixtures such as the lighting troffers F, such fixtures will preferably be provided with suitable electrical wiring or cables W provided with conventional two or three pin plugs, which can be plugged into the sockets or receptacles 32 so avoiding the need for time-consuming stripping of c~bles and connectinq of wires.
At the same time, if one such lighting troffer should require servicing, then it is a simple matter for maintenance personnel in the building to simply remove the entire troffer by unplugging it from its receptacle and replacing it with a new' one.
As shown in Figure 1, a ceiling structure according . , ~
793~
to the invention may, and preferably will be combined with a plurality of vertical posts or co]umn.s 70, extendinq vertically downwardly to the floor below the ceiling. Such posts can be provided therein with electrical cables extending upwardly as at Y to a conventional electrical plug, for example, a three-pin plug, which can be inserted in a convenient one of the receptacles 32. Such a post 70 can then be provided with one or more electrical receptacles at suitable heights for connection of various appliances requiring electrical power.
It will, of course, be understood that some of the services will require different voltages. For example, conven-tional office equipment requires a supply voltage of 120V, while other equipment may require a higher voltage. For example, the lighting troffer fixtures F may require a supply voltage from 340 to 350 volts. Accordingly, alternate ones of the struts 10 are preferably wired with harnesses providing diferent voltages so that one such strut 10 will be a power strut and the next one will be lighting strut and so on. Other combinations of different voltage supplies may also be provided.
The invention also envisages the manufacture of complete strut assemblies in the factory complete with wiring harnesses and receptacles. Plug connection means may be provided at one end of each strut for simplified connection into the main electrical supply system. Receptacles can also be located at regularly spaced in ervals along the struts and closed off or covered and sealed, until such time as they are required.
.. ..
~aving described what is believed to be the best mode by which the invention may be pertormed, it will be seen that the invention may be particularly defined as fol-3~ lows:
~7934 A ceilin~ structure adapted for the receipt of electrical wiring therein, said ceiling structure comprising, a plurality of longitudinal hollow parallel channel members each such member havin~ a bottom wall and side walls, and flanges along the upper edges of their side walls, a plurality of transverse hollow channel members adapted to extend between said longitudinal members, each said transverse member having a bot~om wall, and side walls, junction means for connecting said transverse channel members in end abutting relation with said side walls of said longitudinal channel members, suspension means on at least some of said members, whereby the same may be suspended in position, and, a plurality of releasably attachable electrical connection boxes, each having side walls, end walls,and a top wall,and having downwardly directed edge portions defining an access opening, said edge portions being spaced apart a distance to fit over said flanges on said channel members, and enclose the same along a portion of their length, with said access opening registering with said opening between said flanges.
The invention further comprises such a ceiling structure wherein said edge portions comprise lower edges of said side and end walls including notch means cut in at least one of said side walls and end walls.
- The invention further comprises such a ceiling structureincluding notch means cut in at least one of said side walls and end walls, and registering with said flanges, whereby said side walls may fit downwardly over said flanges, with said flanges extending upwardly into said notch means.
The invention further comprises such a ceiling structure including box attachment means for each said box, said attachment ~37934 means beln~ dimensioned to extend into said channel member beneath said box, and being attachahle thereto.
The foregoing is a description of a preferred embodiment of the invention which is given here by way of example only. The invention is not to be taken as limited to any of the specific features as described, but comprehends all such variations thereof as come within the scope of the appended claims.
.
BACKGRO[1ND OF TH~ INVENTI ON
The present invention relates generally to ceiling structures and more particularly to a ceiling structure of the type which comprises a grid of supporting strut members for supporting lighting fixtures, air handling outlets, ceiling panels and the like.
The arrangement of electrical wiring conduits in office and light industrial buildings varies considerably. For example, such ducts are sometimes laid in the flooring or in the air space between the ceiling and the next upwardl~
adjacent floor.
In order to achieve maximum flexibility in the use and partition of such office, lighting industrial space and commercial space, it is desirable that the wiring be capable of being arranged across the space in parallel lines with provision for tapping into the electrical conduits at various points as may be required from time to time.
Various systems have heretofore been proposed for satisfying ~hese objectives.
However, such known systems have suffered from a variety of defects, being either undul~ complex or expensive or, in some cases, failing to provide for the facility for maximum electrical wiring distribution in the most efficient and economical way.
The erection of a suspended ceiling in such commercial, office or industrial space often employs a rectangular grid of supporting struts suspended from the floor above. Ceiling panels, lighting fixtures and air handling facilities are also incorporated in or supported on such a grid. In some cases, electrical services, conduits and the like have been located in the space il~lL~7~34 between such a ~eilin~ qrid, and the Eloor above. Electrical services are then led through the ceiling to the working area , below by vertical posts or columns.
This known system permits a highly flexible and convenient electrical distribution system but results in a complex network of wires, conduits, air ducts and the like, occupying the limited space between the ceiling and the floor above.
In addition installation and servicing of facilities in such a limited space involves various trades which may some-times cause difficulty.
SUMMARY OF THE INVENTION
.. . _ .. . .
The present invention seeks to combine the function of a ceiling strut grid with that of electrical distribution in a single ceiling structure.
~ Broadly a ceiling structure in accordance with this inven-- tion comprises a plurality of mutually parallel, mutually spaced apart, hollow longitudinal members a plurality of transverse members, ~ terminally connected by junction means to said longitudinal ; 20 members and extending therebetween to form a grid-like structure including open spaces, and said longitudinal members being adapted to receive insulated electrical cables within at least some of said longitudinal members, and electrical connec-tion boxes releasably attached on top of the longitudinal members, whereby electrical connections may be made at various locations in the ceiling.
In accordance with a preferred feature of this inven-tion, a ceiling structure in accordance therewith is provided with a plurality of electrical receptacle fittings and fastener means for fastening such receptacles in position on the longitudinal .~' i7~34 members at spaced intervals therealong.
In accordance with another features of this invention, a ceiling structure in accordance therewith may be sombined with vertically extending electrical supply posts extending down-wardly to the floor from the ceiling and provided with electrical outlets so to provide for electrical distribution in the working space beneath the ceiling.
The various features of novelty which characterize the inv~ntion are pointed out with particularity in the claims annexed to and forming a part of this disclosure. For a better understanding of the invention, its operating advantages and specific objects attained by its use, reference should be had to the accompanying drawings and descriptive matter in which there are illustrated and described preferred embodiments of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
_ The invention will now be described merely by way of illu~tration in the accompanying drawings in which:
Figure 1 is a fragmentary and somewhat schematic per-spective view from above of one embodiment of a ceiling structureaccording to the invention, and showing various optional features provided pursuant to preferred features of this invention;
Figure 2 is an exploded and fragmentary perspective view of two longitudinal members forming part of the ceiling structure shown in Figure;
Figure 3 is an enlargsd exploded perspective view showing one systçm for interconnecting th~ longitudinal and transverse members of the ceiling structure shown in Figure l;
Figure 4 is an enlarged exploded and fragmentary per-spective view showing how an electrical junction box can be mounted on a ~ struct~lre accorAins to the invention, and, Figure 5 is a cut-away perspective of a detail of Figure 3.
DESCRIPTION OF THE PREFERRED ~MBODIMENT
. .
Referring first to Figure 1, it will be seen that the invention is illustrated therein as comprising a rectangular grid-like structure generally indicated at 8 for supporting a ceiling. Known rectangular grid type ceilings have in the past usually comprised simple T~shaped strut members for supporting ceiling panels, accoustic panels, lighting fixtures, air handling fixtures and the like.
In the present in~ention, similar ceiling panels or accoustic panels illustrated as P are shown for closing off the openings in the grid-like structure. In addition, two lighting fixtures indicated at F in ~he form of fluorescent lighting troffers are also shown.
While specific air handling fixtures such as inlets, outlets, duct work and the like are not shown, it will of course be appreciated and well understood by those in the art that such fixtures can readily be placed in position, as desired, in the ceiling structure 8 in generallv the same way as in known forms of rectangular grid type ceilings.
Th,e ceiling structure 8 comprises mutually spaced apart longitudinal members or struts 10 and mutually spaced apart transverse members or struts 12 terminally secured to the longi-tudinal struts 10 to form a grid-like structure including the aforementioned openings. The ceiling structure 8 is supported from an overhead structure at suitably spaced intervals by means such as the support wires indicated at 14.
In accordance with well known practice, the support 1~7~34 wires 14 are attached to any suitable portions of the building fabric typically to the underside of the floor above (not shown).
Referring now in more detai.l to Figure 2, it will be seen that two of the longitudinal struts 10 are show~ therein in exploded or spaced apart relationship.
Each of such struts 10 will be seen to comprise a generally hollow tubular section of sheet metal having a flat bottom wall 16 (Figure 3), vertical and flat side walls 18, and two partial horizontal top wall portions 20.
Spaced apart and upwardly extending flanges or lips 22 are formed along the free or inner edges of the top wall portions 20~
Mechanical connection of the ends of adjacent lengths ~ of the struts 10 is achieved by means of sheet metal junction .: plat~ members 24 which are fastened to the struts 10 by any : suitable means such as sheet metal screws or rivets 25 as shown.
It is to be noted that the junction plate members 24 are omitted from Figure 1 and 4.
The junction plates 24 are formed along their side edges with flanges 26 for attachment of the transverse struts 12 in the manner yet to be described. It is to be noted that the free edges of the flanges 26 are positioned outwardly of the side : walls 18.
Electrical ground continuity between adjacent ones of the longitudinal struts 10 is provided by means of tongue members 28 which are spot welded to one end of each such longitudinal strut 10 so as to extend longitudinally therefrom. Each such tongue member 28 has a width which is less than the interior width of the strut 10 so that it will fit between the side walls 18 of an adjacent strut 10 as will be readily understood from ~37934 Figure 2.
The ton~ue members 28 are provided with suitable electrical fastening means such as a bolt 30 to which ground wires G are attached for a reason yet to be explained.
Suitable electrical plug-receiving receptacles generally indicated at 32 are also usefully provided. Each such receptacle 32 comprises a face plate 34, an electrical plug-receiving portion 36 mounted in the face plate 34 and a plurality, in this case, four spring steel leg portions 38.
The legs 38 are dimensioned so as to make a snap-fit between the upstanding lips 22 of the top wall portions 20 and to ground the cover plates 34 to the struts 10. The ground terminals of the plug-receiving portions 36 are connected by the ground wires G to a respective one of the bolts 30.
In accordance with the invention, the longitudinal struts 10 are provided with a suitable decorative exterior coating such as paint or the like on their outwardly directed surfaces but their inwardly directed surfaces, at least along the ~ -opposed faces of the lips 22, are left free of any coating which would inhibit good electrical contact between such lips 22 for example and the aforementioned legs 38.
Wiring harnesses H (Figure 2) are laid within at least some of the longitudinal struts 10 to supply electrical power to the receptacles 32. To facilitate the introduction of such harnesses H the longitudinal struts 10 are provided with removable cover plates ~0 which are provided in turn, with a plurality of spring legs 42 depending downwardly therefrom at suitably spaced intervals therealong for holding them in position on the longi-tudinal struts 10.
The cover plate members 40 may be made in different _ 7~34 lengths and may~ for example, be made with weakened portions at predetermined spaced points therealon(~ so that they may be readily broken off to desired lengths to fit any particular modular arrangement.
It will be seen from Figure 3 that the strut 10 shown therein is supported by means of the wire 14 which is attached to a narrow strap 44 extending across the width of the interior of the strut 10 between its side walls 18, and fastened in position by any suitable means such as by the same rive,ts (not shown) which secure the ~unction plate 24 in position ox by separate rivets 45 as shown in Figure 4.
One of the tran~verse struts 12 is shown in more detail in Figure 3, from which it will be seen that it comprises a bottom wall 16, side walls 18 and top wall portions 20 with lips 22, in the same manner as the longitudinal struts 10.
For joining the ends of transverse struts 12 at right angles to the longitudinal strut~ 10, end connectors 46 are secured to the interior surfaces of the side walls 18 of the transverse struts 12 by any suitable means, for example, by spot 2Q welding or the like. ~he connectors 46 are formed with connector ribs 47 which are arranged to make a sliding interfitting engage-ment with the edge flanges 26 on the junction plate 24 and are locked in assembled position by means of locking clips 48 formed on the flanges 26 and interlocking with holes 49 provided in the members 46.
Once assembled in the form of the grid as shown in Figure 1 and with that grid suspended in position, ceiling panels or accoustic panels P may simply be laid on the top surfaces of the top wall portions 20 of the struts 10 and 12 generally in edge abutment with the flanges 22.
L)epending on the size and shape of such ceiling panels P, additional dummy struts S (Figure 1) may be secured between adjacent struts 10 or 12 to support such panels.
Similarly, lighting troffer fixtures F may simply be laid in position longitudinally or transversely with ceiling panels laid on either or both sides thereof in accordance with well known practice. In the same way, air handling fixtures may also simply be laid so that they rest upon the top wall portions 20 of the struts 10 and 12. Usefully, the open spaces between adjacent pairs of the longitudinal and transverse struts 10 and 12 respectively are square in plan so facilitating the positioning of a lighting troffer fixture F in either direction.
Usefully, the electrical power harnesses H are arranged in the longitudinal struts 10 so that they eXtend from one side to the other of the ceiling thereby providing for a fully flexible system of electxical distribution throughout a given building space.
Electrical power may be supplied to such harnesses ~ by electrical cables C terminating at connection boxes 50 ~Figure 4).
Such connection boxes 50 will be of any suitable sheet metal construction having side walls 52, end walls 54 and a removable top cover 56. Suitable knock outs 58 may be provided for introduction of the wiring in a conventional manner.
Each connection box 50 has an open base, the lower edges of its side walls 52 being spaced apart a distance such that they will fit snugly around the outer faces of the upstanding flanges 22 of the struts 10.
The end walls 54 of the boxes 50 are dimensioned so that they can extend downwardly between such flanges 22, and so that the aforem~ntioned cover plates 40 will thus abut against 7~34 the outer faces of the end w~lls 54 so -to provide a completely closed off system.
Notches 60 are formed between the lower portions of the side walls 52 and the end walls 54 so as to permit the former to straddle the upstanding flanges 22 in the manner described.
Within the connection box 50, there is provided a mounting plate 62 which is spot welded or fastened in any other suitable manner to the inner faces of the side walls 52.
A mounting screw 64 extends do~nwardly from the plate 62 and is threaded into an oversize locking plate 66 which has an elongated rectanqular shape, its narrower dimension being such that it will fit between the lips 22, and can then be rotated (arrows A) so as then to underlie the top wall portions 20 of the struts 10. Consequently, when the screw 64 is tightened, it will clamp the connection box S0 to the strut 10. A ground wire G
ensures ground continuity between the connection box 50 and the strut 10.
In order to simplify installation of lightinq fixtures such as the lighting troffers F, such fixtures will preferably be provided with suitable electrical wiring or cables W provided with conventional two or three pin plugs, which can be plugged into the sockets or receptacles 32 so avoiding the need for time-consuming stripping of c~bles and connectinq of wires.
At the same time, if one such lighting troffer should require servicing, then it is a simple matter for maintenance personnel in the building to simply remove the entire troffer by unplugging it from its receptacle and replacing it with a new' one.
As shown in Figure 1, a ceiling structure according . , ~
793~
to the invention may, and preferably will be combined with a plurality of vertical posts or co]umn.s 70, extendinq vertically downwardly to the floor below the ceiling. Such posts can be provided therein with electrical cables extending upwardly as at Y to a conventional electrical plug, for example, a three-pin plug, which can be inserted in a convenient one of the receptacles 32. Such a post 70 can then be provided with one or more electrical receptacles at suitable heights for connection of various appliances requiring electrical power.
It will, of course, be understood that some of the services will require different voltages. For example, conven-tional office equipment requires a supply voltage of 120V, while other equipment may require a higher voltage. For example, the lighting troffer fixtures F may require a supply voltage from 340 to 350 volts. Accordingly, alternate ones of the struts 10 are preferably wired with harnesses providing diferent voltages so that one such strut 10 will be a power strut and the next one will be lighting strut and so on. Other combinations of different voltage supplies may also be provided.
The invention also envisages the manufacture of complete strut assemblies in the factory complete with wiring harnesses and receptacles. Plug connection means may be provided at one end of each strut for simplified connection into the main electrical supply system. Receptacles can also be located at regularly spaced in ervals along the struts and closed off or covered and sealed, until such time as they are required.
.. ..
~aving described what is believed to be the best mode by which the invention may be pertormed, it will be seen that the invention may be particularly defined as fol-3~ lows:
~7934 A ceilin~ structure adapted for the receipt of electrical wiring therein, said ceiling structure comprising, a plurality of longitudinal hollow parallel channel members each such member havin~ a bottom wall and side walls, and flanges along the upper edges of their side walls, a plurality of transverse hollow channel members adapted to extend between said longitudinal members, each said transverse member having a bot~om wall, and side walls, junction means for connecting said transverse channel members in end abutting relation with said side walls of said longitudinal channel members, suspension means on at least some of said members, whereby the same may be suspended in position, and, a plurality of releasably attachable electrical connection boxes, each having side walls, end walls,and a top wall,and having downwardly directed edge portions defining an access opening, said edge portions being spaced apart a distance to fit over said flanges on said channel members, and enclose the same along a portion of their length, with said access opening registering with said opening between said flanges.
The invention further comprises such a ceiling structure wherein said edge portions comprise lower edges of said side and end walls including notch means cut in at least one of said side walls and end walls.
- The invention further comprises such a ceiling structureincluding notch means cut in at least one of said side walls and end walls, and registering with said flanges, whereby said side walls may fit downwardly over said flanges, with said flanges extending upwardly into said notch means.
The invention further comprises such a ceiling structure including box attachment means for each said box, said attachment ~37934 means beln~ dimensioned to extend into said channel member beneath said box, and being attachahle thereto.
The foregoing is a description of a preferred embodiment of the invention which is given here by way of example only. The invention is not to be taken as limited to any of the specific features as described, but comprehends all such variations thereof as come within the scope of the appended claims.
.
Claims (8)
1. A ceiling structure adapted for the receipt of electrical wiring therein, said ceiling structure comprising;
a plurality of longitudinal hollow parallel channel members each such member having a bottom wall and side walls, and flanges along the upper edges of their side walls;
a plurality of transverse hollow channel members adapted to extend between said longitudinal members, each said transverse member having a bottom wall, and side walls;
junction means for connecting said transverse channel members in end abutting relation with said side walls of said longitudinal channel members;
suspension means on at least some of said members, whereby the same may be suspended in position, and, a plurality of releasably attachable electrical connection boxes, each having side walls, end walls, and a top wall, and having downwardly directed edge portions defining an access opening, said edge portions being spaced apart a distance to fit over said flanges on said channel members, and enclose the same along a portion of their length, with said access opening registering with said opening between said flanges.
a plurality of longitudinal hollow parallel channel members each such member having a bottom wall and side walls, and flanges along the upper edges of their side walls;
a plurality of transverse hollow channel members adapted to extend between said longitudinal members, each said transverse member having a bottom wall, and side walls;
junction means for connecting said transverse channel members in end abutting relation with said side walls of said longitudinal channel members;
suspension means on at least some of said members, whereby the same may be suspended in position, and, a plurality of releasably attachable electrical connection boxes, each having side walls, end walls, and a top wall, and having downwardly directed edge portions defining an access opening, said edge portions being spaced apart a distance to fit over said flanges on said channel members, and enclose the same along a portion of their length, with said access opening registering with said opening between said flanges.
2. A ceiling structure as claimed in Claim 1 wherein said edge portions comprise lower edges of said side and end walls including notch means cut in at least one of said side walls and end walls.
3. A ceiling structure as claimed in Claim 2 including notch means cut in at least one of said side walls and end walls, and registering with said flanges, whereby said side walls may fit downwardly over said flanges, with said flanges extending upwardly into said notch means.
4. A ceiling structure as claimed in Claim 3 wherein said notch means comprise generally triangular shaped notches formed by cutting a portion out of both said side walls and said end walls at their corner.
5. A ceiling structure as claimed in Claim 1 wherein said top wall of each said box is removable from said box, and including releasable fastening means for fastening said top wall in position.
6. A ceiling structure as claimed in Claim 1 including box attachment means for each said box, said attachment means being dimensioned to extend into said channel member beneath said box, and being attachable thereto.
7. A ceiling structure as claimed in Claim 6 including a plate member forming part of said box attachment means, said plate member having a width less than the width of said channel opening, and a length greater than the width of said opening, whereby the same may be inserted into said channel member, and rotated into interlocking engagement beneath said flanges of said channel member.
8. A ceiling structure as claimed in Claim 7 including a bracket forming part of said box attachment means, a said bracket being located in each said box, and bolt means extending between said bracket and said plate member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA340,505A CA1107934A (en) | 1979-11-23 | 1979-11-23 | Electrified ceiling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA340,505A CA1107934A (en) | 1979-11-23 | 1979-11-23 | Electrified ceiling system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1107934A true CA1107934A (en) | 1981-09-01 |
Family
ID=4115679
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA340,505A Expired CA1107934A (en) | 1979-11-23 | 1979-11-23 | Electrified ceiling system |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1107934A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1002725C2 (en) * | 1996-03-27 | 1997-09-30 | Electric Engineering B V | Carrying system for cables, as well as carrying bracket and cable tray for use in such a carrying system. |
-
1979
- 1979-11-23 CA CA340,505A patent/CA1107934A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1002725C2 (en) * | 1996-03-27 | 1997-09-30 | Electric Engineering B V | Carrying system for cables, as well as carrying bracket and cable tray for use in such a carrying system. |
| BE1011676A3 (en) * | 1996-03-27 | 1999-12-07 | Vennootschap Electric Engineer | Support system to CABLES AND WEAR BRACKET AND CABLE TRAY FOR USE IN SUCH A support system. |
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