GB2175936A - Underfloor cable trunking systems - Google Patents

Underfloor cable trunking systems Download PDF

Info

Publication number
GB2175936A
GB2175936A GB08612502A GB8612502A GB2175936A GB 2175936 A GB2175936 A GB 2175936A GB 08612502 A GB08612502 A GB 08612502A GB 8612502 A GB8612502 A GB 8612502A GB 2175936 A GB2175936 A GB 2175936A
Authority
GB
United Kingdom
Prior art keywords
ofthe
sub
trunking
transversely extending
elongate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB08612502A
Other versions
GB2175936B (en
GB8612502D0 (en
Inventor
Alfred Phillip Burns
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.)
Balfour Beatty PLC
Original Assignee
BICC PLC
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 BICC PLC filed Critical BICC PLC
Publication of GB8612502D0 publication Critical patent/GB8612502D0/en
Publication of GB2175936A publication Critical patent/GB2175936A/en
Application granted granted Critical
Publication of GB2175936B publication Critical patent/GB2175936B/en
Expired 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
    • H02G3/28—Installations of cables, lines, or separate protective tubing therefor in conduits or ducts pre-established in walls, ceilings or floors
    • H02G3/283—Installations of cables, lines, or separate protective tubing therefor in conduits or ducts pre-established in walls, ceilings or floors in floors
    • H02G3/285—Installations of cables, lines, or separate protective tubing therefor in conduits or ducts pre-established in walls, ceilings or floors in floors in modular floors, e.g. access floors
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F15/00—Flooring
    • E04F15/02—Flooring or floor layers composed of a number of similar elements
    • E04F15/024—Sectional false floors, e.g. computer floors
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F15/00—Flooring
    • E04F15/02—Flooring or floor layers composed of a number of similar elements
    • E04F15/024—Sectional false floors, e.g. computer floors
    • E04F15/02447—Supporting structures
    • E04F15/02452—Details of junctions between the supporting structures and the panels or a panel-supporting framework

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Floor Finish (AREA)

Abstract

In a simple and inexpensive underfloor cable trunking system 6 comprising open topped cable trunking 7 supported at intervals on upstanding supports 10 and closed by flat cover plates 17, each cover plate is supported on and detachably secured to an underlying sub-assembly 16 which is detachably secured to the trunking. The sub-assembly 16 consists of two transversely extending elongate members 21 underlying longitudinally spaced marginal portions of a cover plate 17 and, extending between and detachably connected to the members, at least one longitudinally extending elongate bearer 31. The sub-assemblies 16 of adjacent cover plates 17 are detachably connected together. <IMAGE>

Description

SPECIFICATION Underfloor cabletrunking systems This invention relates two undenfloor cable trunking systems ofthe kind comprising underfloortrunking for housing electric power, telephone and other service cables and, at predetermined positions in the system, boxes which house and provide access to socket outlets associated with the power,telephone and other service cables, such boxes generally and hereinafter being referred to as "access" boxes.
The invention is particularly concerned with an underfloor cabletrunking system ofthis kind which is especially suitable for use with a floor construction comprising a mutiplicity of floor panels, each having a substantially flat upper surface of a substantial surface area, which are supported at their contiguous corners on floorjacks or other upstanding supports so that there is a void beneath the floor. For convenience, a floor construction of this kind will hereinafter be referred to as "a floor construction ofthe kind described".
It is the general practice to provide, in a floor construction ofthe kind described, an underfloor cable trunking system in which the side walls of open-toppedcabletrunking aresupportedatspaced positions along their lengths on floorjacks or other upstanding supports and in which the open top ofthe cable trunking is closed by a multiplicity of substan- tiallyflat cover plates, each of which extends across the full width of and is secured to the trunking,which are arranged in alignmentalongthetrunking with their neighbouring side edges contiguous with one another and with their upper surfaces substantially flush with the upper surfaces ofthefloor panels.At any position in the trunking system where an access box is required, it has been proposed to replace the cover plate at that position by an access box having a hinged lid which, when closed, lies with its upper surfaceflush with the upper surface ofthe surrounding floor and to provide, in the hinged lid, at least one cable outletthrough which a cable electrically connected to a plug mated with a socket outlet in the access box can passtoanapplianceorequipmentto be used. For both appearance and safety reasons, normally a facility is provided for blocking offthe or any cable outlet in the hinged lid when the cable outlet is not in use.The hinged lid is normally covered with a piece of carpet or otherfloor covering matching that of the surrounding floor and, to separate the piece of carpet or otherfloor covering on the lid from the surrounding carpet or other floor covering, the access box normally includes a carpet segregatorframe or other meansthe height of which can be adjusted to ensure thatthe upper surface of the segregator isflush with the uppersurface of the surrounding carpet.
Whilst the side walls of the cabletrunking supported on floorjacks or other upstanding supports at spaced positions along their lengths (e.g. at intervals of 600mm) act as beams to provide a reasonably sound structure, each of the flat cover plates, which will normally have a dimension in a direction transverse to the longitudinal axis ofthetrunking substantially greaterthan its dimension in a direction lengthwise of the longitudinal axis of the trunking, needs to be individually strong and collectively the cover plates must be sufficiently strong to withstand the loadl deflection requirements ofthe overallfloorstructure.
The cost ofthe quantity of material necessary to manufacture each cover plate in order that it will have the necessary strength to enable itto withstand such load requirements can constitute a significant and unacceptable proportion of the overall cost of the underfloor cable trunking system.
It is an object of the present invention to provide, for use with a floor construction ofthe kind described, an improved underfloor cable trunking system that is simple and inexpensive.
According to the invention, the improved underfloor cable trunking system comprises open-topped cabletrunking whose side walls are supported at intervals along their lengths on floorjacks or other upstanding supports and, closing the open top ofthe trunking, a multiplicity of substantially flat cover plates ofsubstantially rectangular shape each extending across the full length of and detachably secured to the trunking, which cover plates are arranged in alignmentalongthetrunkingwiththeirneighbouring side edges abutting one another and with their upper surfaces of the floor panels, wherein at each position alongthetrunking atwhichsideedgesofadjacent cover plates abut, neighbouring marginal portions of adjacent cover platesaresupported on and detachably secured to a transversely extending composite elongate bearer which is directly or indirectly supported on the trunking, which composite bearer consists of two transversely extending elongate members which have, at spaced positions along their lengths, inter-engaging parts integral with the elongate members by means of which the two elongate members are detachably connected together, one of which elongate members underlies a marginal portion of one of said adjacent cover plates and the other ofwhich elongate members underlies a marginal portion ofthe other of said adjacent cover plates.
Preferably, each cover plate is supported on a sub-assembly which is detachably secured to the trunking and which comprises the transversely extending elongate members underlying the longitudinally spaced marginal portions ofthe cover plate and, extending between and detachably connected to the transversely extending elongate members, at least one longitudinally extending elongate bearer. In a preferred embodiment, the sub-assembly supporting each cover plate includes two transversely spaced longitudinally extending elongate bearers which extend between and are detachably connected to the transversely extending elongate members of the sub-assembly. In all cases, preferably the transversely extending members and the or each longitudinally extending bearer of each sub-assembly have interengaging parts integral with the members and bearer by means of which they are detachably connected together.
Preferably, the two transversely extending elongate members of adjacent sub-assemblies detachably connected together to form a transversely extending composite elongate bearer are identical with one another. Preferably, also, each transversely extending elongate member is of substantially channel-shaped transverse cross-section, and has a plurality of longi tudinallyspaced protuberances upstanding from the undersurface of and a plurality of longitudinally spaced holes in the baseofthechannel,thetwo identical elongate members being so arranged that the undersurface ofthe bases ofthe channels abut with the protuberances upstanding from one base detachably engaging in the holes in the other base.
The or each longitudinally extending bearer of each sub-assembly is preferably or substantially L-shaped transverse cross-section, opposite ends ofthe upper limb of the L-shaped bearer on which a cover plate is supported being folded out ofthe plane ofthe limb to form tongues which engage in slots in depressed portions ofthe upper side walls of the channel shaped transversely extending elongate members ofthe sub-assembly.
Preferably, at least one elongate joist extends lengthwise between the side walls of and is secured to the base ofthetrunking; the or each joist may be of L-shaped transverse cross-section and arranged with one of its limbs upstanding.
Each cover plate preferably is detachably secured at each of its four corners to the underlying transversely extending channel-shaped elongate members by screws which are in screwthreaded engagement in tapped holes in the uppermost side walls of the channel-shaped elongate members.
Preferably, to incorporate an access box at any desired position in the improved underfloor cable trunking system, a cover plate atthat position and the underlying sub-assemblyto which it is secured are removed and an access box of corresponding size is fitted into the vacated open topped part of the trunking. Forthis pu rpose, we preferto employ the improved access boxforming thesubjectof our co-pending PatentApplication No: 86/ filed on the same day as the present application.
The invention is further illustrated bya description, byway of example, ofthe preferred underfloor cable trunking system with reference to the accompanying drawings, in which : Figure lisa perspective and partially exploded view ofthe preferred underfloorcabletrunking system; Figure 2 is a perspective view of a sub-assembly of the underfloorcabletrunking system shown in Figure 1; Figures 3,4 and 5 respectively, are plan, side and end views of a transversely extending elongate member ofthe sub-assembly shown in Figure 2; Figures 6 and 7, respectively, are side and end views of a longitudinally extending elongate bearerofthe sub-assembly shown in Figure 2; Figure 8 is a transverse cross-sectional view ofthe underfloorcabletrunking system shown in Figure 1;; Figure 9 is a cross-sectional viewtaken on the line IX - IXin Figure 8; and Figure 10 is a perspective view, drawn on a larger scale, ofdetail ofthe underfloor cable trunking system shown in Figure 1.
Referring to Figures 1 and 2, a floor construction 1 comprises a multiplicity of floor panels 2, each having aflat upper surface of a substantial surface area, which are supported at their contiguous corners on floor jacks 3 so that there is a void 4 beneath the floor.
Incorporated in the floor construction 1 is an underfioorcabletrunking system 6comprising open-topped cabletrunking 7 whose side walls 8 are supported at intervals along their lengths on transversely extend ing beams 9 adjustably mounted on upstanding supports 10. Secured to the base ofthe trunking 7 are longitudinally extending joists 14 of L-shaped transverse cross-section, each of which is arranged with one limb 15 upstanding. A plurality ofsub-assemblies 16 are arranged in alignment along thetrunking 7, each ofwhich sub-assemblies extends acrossthefull width ofthe trunking and is contiguous with and detachably connected to an adjacent su b-assembly.
Flat cover plates 17 of rectangular shape overlie the sub-assemblies 16 and each cover plate is screwed at each of its four corners to an underlying sub-assembly 16. Atone position along thetrunking 7, a cover plate 17 and the underlying sub-assembly 16 are removed and replaced by an access box 18 which is of such a shape and size that it fits into the open-topped part of the trunking vacated by the cover plate and subassembly. The main lid 19 ofthe access box 18 has in one of its side edges three recesses in each of which is detachablysecored a cable outlet unit 20, ofwhich part only is shown. Feeder ducting 12 is provided along which service cables can be laid, entering the trunking 7 through apertures in the side walls 8 ofthe trunking.
Referring to figures 2 to 7, each sub-assembly 16 comprises two longitudinally spaced transversely extending elongate members 21 which underlie longitudinally spaced marginal portions ofthe associated cover plate 17 and, extending between and detachably connected to the transversely extending elongate members, two transversely spaced longitudinally extending elongate bearers 31. The transversely extending elongate members 21 of each subassembly 16 are identical and, as illustrated in Figures 3 to 5, each is of channel-shaped transverse crosssection and comprises an upstanding base 22, an upperflange23 and a lowerflange 24.Each transversely extending elongate member 21 has in its base 22 three apertures 25 and threewindows 26 out of which are folded lugs 27, the apertures 25 and lugs 27 being so located thatwhen two identical transversely extending elongate members are so arranged that the undersurfaces of the bases 22 abut, the lugs 27 of one transversely extending elongate member engage in the apertures 25 of the other transversely extending elongate memberto form a transversely extending composite elongate bearer. In a depressed area 28 at each end ofthe upperflange 23, a tapped hole 29 is provided for reception of a screw by which a cover plate 17 can be secured to the sub-assembly 16 of which the transversely extending elongate member 21 forms a part. Slots 30 are provided in the upper flange 23 attwo transversely spaced depressed areas 40, the purpose of which will be explained.
As will be seen on referring to Figures 6 and 7, each longitudinally extending bearer 31 of each subassembly 16 is of L-shaped transverse cross-section, opposite ends ofthe upper horizontal limb 32 ofthe L-shaped bearer, on which a cover plate 17 can be supported, being folded outofthe piane of the limbto form tongues 34 which engage in the slots 30 in the depressed areas 40 ofthe upperflanges 23 of the transversely extending elongate members 21 ofthe sub-assembly of which the longitudinally extending bearerforms a part. The upeprsurface ofthe upper horizontal limb 32 of each bearer 31 at said opposite ends are substantially co-planar with the upper surfaces ofthe upper flanges 23 ofthe members 21.
Aswill be seen on referring to Figures 8 and 9, at each of its four corners, each cover plate 17 has a downwardly extending tubular boss 42 which is in axial alignment with the tapped hole 29 in, and by which the cover plate is supported on, the underlying depressed area 28 ofthe upper flange 23 of a transversely extending elongate member 21 of an underlying sub-assembly 16. The depths of the depressed areas 28 and 40 are such that each cover plate 17 is in contact with and is supported on a substantial area of the upperflanges 23 of the transversely extending elongate members 21 ofthe sub-assembly 16 underlying the cover plate; each cover plate is also in contact with and is supported on the upper limbs 32 ofthe bearers 31 ofthesub- assembly underlying the cover plate.When the cover plate 17 is secured at each of its four corners to the underlying sub-assembly 16 by screws (not shown), inwardly directed flanges 41 along the upper edges of the side walls 8 ofthetrunking 7 are detachably clamped between the cover plate and the transversely extending elongate members 21 of the sub-assembly 16.
The inter-engaging lugs 27 and apertures 25 in the abutting bases 22 of the adjacenttransversely extending elongate members 21 which form a transversely extending composite elongate bearer servetotransfer a load applied to one of the transversely extending elongate members to the other ofthe transversely extending elongate members.
The abutting transversely extending elongate mem bers21 of adjacent sub-assemblies 16 are so detachably connected together that any sub-assembly can be readily removed from the trunking 7 to provide access to the trunking and, if required, to be replaced by an access box 18.
As has been explained, the side walls 8 ofthe cable trunking 7 are supported at intervals along their lengths on transversely extending beams 9 adjustably mounted on upstanding supports 10. As will be seen on referring to Figure 10, each upstanding support 10 comprisesascrewthreaded stud 50 two which the associated beam 9 is adjustablysecured by nuts 51 and 52 and by means of which the height ofthe trunking can be adjusted.At each position where two lengths ofcabletrunking 7 are secured end to end by means of fish plates (not shown) secured to the inner faces ofthe side walls 8 by screws 54 and 55, a panel bearer 56 of inverted channel-shaped cross-section is secured to the outer faces ofthe side walls by screws 54, the panel bearers serving to supportfloor panels 2.
Acopperstrip 58 secured to the panel bearer 56 constitutes an earth link.
The present invention provides an improved underfloorcabletrunking system in which the cover plates 17 are so supported that they can bethinnerthan cover plate of underfloor cable trunking systems hitherto proposed and used because the manner in which they are supported in thetrunking 7 enables thin cover plates to withstand the load/deflection requirements of the overall floor structure. Since the quantity of material in each cover plate is substantially less than that employed in cover plates of underfloor cabletrunking systems hitherto proposed and used, the improved underfloortrunking system ofthe present invention is substantially less expensive.

Claims (12)

1. For use with a floor construction of the kind described, an underfloorcabletrunking system comprising open-topped cable trunking whose side walls are supported at intervals along their lengths on floor jacks or other upstanding supports and, closing the open top of the trunking, a multiplicity of substantially flat cover plates of substantially rectangular shape each extending acrossthefull length of and detachably secured to the trunking, which cover plates are arranged in alignment along thetrunking with their neighbouring side edges abutting one another and with their upper edges substantiallyflush with the upper surfaces of the floor panels, wherein at each position along thetrunking at which side edges of adjacent cover plates abut, neighbouring marginal portions of adjacent cover plates are supported on and detachably secured to a transversely extending composite elongate bearerwhich is directly or indirectly supported on the trunking, which composite bearer consists of two transversely extending elongate members which have, at spaced positions along their lengths, inter-engaging parts integral with the elon- gate members by means of which the two elongate members are detachably connected together, one of which elongate member underlies a marginal portion of one of said adjacent cover plates and the other of which elongate members underlies a marginal por tion of the other of said adjacent cover plates.
2. An underfloorcabletrunking system as claimed in Claim 1,wherein each cover plate is supported on a sub-assembly which is detachably secured to the trunking and which comprises the transversely extended elongate members underlying the longitudi nally spaced marginal portions of the cover plate and, extending between and detachably connectedto the transversely extending elongate members, at least one longitudinally extending elongate bearer.
3. An underfloor cable trunking system as claimed in Claim 2, wherein the sub-assembly supporting each cover plate includes two transversely spaced long it dinally extending elongate bearers which extend between and are detachably connected to the transversely extending elongate members ofthe subassembly.
4. An underfloorcabletrunking system as claimed in Claim 2 or 3, wherein the transversely extending members and the or each longitudinally extending bearer of each sub-assembly have inter-engaging parts integral with the members and bearer by means of which they are detachably connected together.
5. An underfloorcabletrunking system as claimed in any one ofthe preceding Claims,whereinthetwo transversely extending elongate members of each transversely extending composite elongate bearer are identical with one another.
6. An underfloor cable trunking system as claimed in Claim 5, wherein each transversely extending elongate member of each composite elongate bearer is of substantially channel-shaped transverse crosssection, and has a plurality of longitudinally spaced protuberances upstanding from the undersurface of and a plurality of longitudinally spaced holes in the base ofthe channel, the two identical elongate members being so arrangedthatthe undersurfaces of the bases ofthe channels abut with the protu berances upstanding from one base detachably engaging in the holes in the other base.
7. An underfloorcabletrunking system as claimed in Claim 6, wherein the or each longitudinally extending bearer of each sub-assembly is of substantially L-shaped transverse cross-section, opposite ends of the upper limb ofthe L-shaped bearer on which a cover plate is supported being folded out ofthe plane ofthe limb to form tongues which engage in slots in depressed portions of the upperside walls of the channel-shaped transversely extending elongate members ofthe sub-assembly.
8. An underfloorcabletrunking system as claimed in Claim 6 or7, wherein each cover plate is detachably secured at each of its four corners to the underlying transversely extending channel-shaped elongate members by screws which are in screwthreaded engagement in tapped holes in the uppermostside walls ofthe channel-shaped elongate members.
9. An underfloor cabletrunking system as claimed in any one of Claims 2 to 8,wherein at at least one position a cover plate atthat position and the underlying sub-assembly to which it is secured are omitted and replaced by an access box of corresponding size which fits into the vacated open topped part of thetrunking.
10. An underfloorcabletrunking system as claimed in Claim 9, wherein the or each access box is in accordance with co-pending PatentApplication No: 86/
11. An underfloor cabletrunking system as claimed in any one of the preceding Claims, wherein at least one elongate joist extends lengthwise between the side walls of and is secured to the base ofthe trunking.
12. Forusewith afloorconstruction ofthe kind described, an underfloor cable trunking system sub stantiallyas hereinbefore described with reference to and as shown in the accompanying drawings.
GB08612502A 1985-05-23 1986-05-22 Underfloor cable trunking systems Expired GB2175936B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB858513052A GB8513052D0 (en) 1985-05-23 1985-05-23 Underfloor cable trunking systems

Publications (3)

Publication Number Publication Date
GB8612502D0 GB8612502D0 (en) 1986-07-02
GB2175936A true GB2175936A (en) 1986-12-10
GB2175936B GB2175936B (en) 1988-08-17

Family

ID=10579563

Family Applications (2)

Application Number Title Priority Date Filing Date
GB858513052A Pending GB8513052D0 (en) 1985-05-23 1985-05-23 Underfloor cable trunking systems
GB08612502A Expired GB2175936B (en) 1985-05-23 1986-05-22 Underfloor cable trunking systems

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB858513052A Pending GB8513052D0 (en) 1985-05-23 1985-05-23 Underfloor cable trunking systems

Country Status (1)

Country Link
GB (2) GB8513052D0 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2192915A (en) * 1986-06-10 1988-01-27 Floorplan Electrica Ltd Adjustable height access flooring incorporating ducts
GB2194975A (en) * 1986-08-14 1988-03-23 Ackermann Electrical Syst Outlet boxes for raised floors
GB2202254A (en) * 1987-03-21 1988-09-21 System Floors Electrical outlet box for raised modular floor panels
GB2172916B (en) * 1985-03-27 1989-09-20 Bally Eng Structures Flooring systems with segregated service feeds
US5263289A (en) * 1986-10-22 1993-11-23 Cablescape Access Flooring Pty. Limited Modular hollow floor panels with integral ducting
US6918217B2 (en) * 2002-02-25 2005-07-19 Haworth, Ltd. Raised access floor system
CN108529431A (en) * 2018-05-30 2018-09-14 三海洋重工有限公司 Chassis panel construction and engine house

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2172916B (en) * 1985-03-27 1989-09-20 Bally Eng Structures Flooring systems with segregated service feeds
GB2192915A (en) * 1986-06-10 1988-01-27 Floorplan Electrica Ltd Adjustable height access flooring incorporating ducts
GB2194975A (en) * 1986-08-14 1988-03-23 Ackermann Electrical Syst Outlet boxes for raised floors
GB2194975B (en) * 1986-08-14 1990-02-14 Ackermann Electrical Syst Improvements in and relating to electrical outlet boxes for raised floors
US5263289A (en) * 1986-10-22 1993-11-23 Cablescape Access Flooring Pty. Limited Modular hollow floor panels with integral ducting
GB2202254A (en) * 1987-03-21 1988-09-21 System Floors Electrical outlet box for raised modular floor panels
GB2202254B (en) * 1987-03-21 1991-08-21 System Floors Service outlet box for raised modular floor panels
US6918217B2 (en) * 2002-02-25 2005-07-19 Haworth, Ltd. Raised access floor system
US7650726B2 (en) 2002-02-25 2010-01-26 Haworth, Ltd. Raised access floor system
CN108529431A (en) * 2018-05-30 2018-09-14 三海洋重工有限公司 Chassis panel construction and engine house

Also Published As

Publication number Publication date
GB8513052D0 (en) 1985-06-26
GB2175936B (en) 1988-08-17
GB8612502D0 (en) 1986-07-02

Similar Documents

Publication Publication Date Title
US4593499A (en) Interior panel
US7759575B2 (en) Expandable power distribution unit
US3592956A (en) Electrical raceway wiring distribution system
US4454692A (en) Metal deck raceway construction
US3903666A (en) Access arrangement for an electrical wiring distributing floor structure
US4540847A (en) Electrified ceiling system
US3453791A (en) Underfloor electrical raceway crossover unit
US5434355A (en) Floor board assembly
GB2129847A (en) Cellular flooring units comprising conduits
GB2175936A (en) Underfloor cable trunking systems
US3494381A (en) Connecting means for trench cover plates
US4931597A (en) Junction boxes
US4594826A (en) Field-assembled raceway forming member
US4507900A (en) Electrical distribution for metal deck construction
CA3074716C (en) Cable management floor system
US4661652A (en) Composite header/junction box
GB2172917A (en) Service access unit for floors
US4728750A (en) Receptable support assembly
AU615529B2 (en) Busbar system with holders and power busbar sections
EP0578306A1 (en) Mounting framework
GB2146680A (en) Ducting below an access floor
JPH01138916A (en) Floor panel supporter having plug sockets built-in
US2665027A (en) Underfloor wire distributing system
US4912897A (en) Flooring systems with segregated service feeds
US4584803A (en) High strength cellular metal floor raceway system

Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee