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Publication numberUS3101097 A
Publication typeGrant
Publication dateAug 20, 1963
Filing dateMay 25, 1962
Priority dateMay 25, 1962
Publication numberUS 3101097 A, US 3101097A, US-A-3101097, US3101097 A, US3101097A
InventorsMurray Thomas W
Original AssigneeMurray Thomas W
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Closure mounting means for underfloor wiring ducts
US 3101097 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

Aug. f20, 1963 T. w. MURRAY v3,101,097

cLosuRE MOUNTING MEANS FOR UNDERFLooR WIRING nUcTs Filed may 25, 1962 Q7 NTOR PATENT AGENT UnitedStates Patent() 3,101,097 CLGSURE MUNTING MEANS FOR UNDERFLOOR WRING DUCTS Thomas W. Murray, 357 Cortleigh Blvd., Toronto, Gntario, Canada Filed May 25, 1952, Ser. No. 197,715 3 Claims. (Cl. 13S-92) This invention relates to closure supporting elements for underlloor wiring ducts.

In underiloor wiring systems, it is common practice to provide accessible closure plates either directly on the wiring ducts themselves or on other openings leading to the ducts whereby access to the ducts may be readily effeced. Itis necessary, of course, to provide -rnountings for the plates in association with the ducts. Since pouring of the concrete or like lloor must occur subsequently to the installation of the wiring ducts, damage to or marring of the closure mountings frequently takes place.

It is an object of this invention to provide a closure mounting strip for underlloor wiring ducts which is of simple structure and which may be readily employed to present an nnmarred exposed surface in the finished lloor.

In accordance with the invention, there is provided a closure mounting strip having opposed side faces and opposed longitudinal edges, and a ilange adjoining each said edge and extending angularly from andcontiguous to the adjoining one of said side faces, each said llange being substantially coextensive in length with said strip, eac-l1 said llange having a planar edge surface in substan- 'tially parallel spaced relation to the .adjoining one of said side faces, one of said flange edge surfaces being spaced from the adjoining one of said side faces a greater distance than the other of said flange edge surfaces is spaced from the adjoining one of said side faces, whereby said strip may be selectively positioned to present flanges of varying height.

The invention will be described with reference to the accompanying drawing, in which,

LFIGURE 1 is a sectional elevation of an underiloor duct and associated elements in accordance with the invention, and

FIGURE Z is a plan view.

`In the drawing, the underlloor duct shown comprises a bottom channel member l having a bottom wall 2, side walls 3, 'and longitudinal edge flanges '4, and top members 5 each having a side wall 6 in overlapping engagement with a side wall 3, a flange 7 overlying a flange 4 and a vertically disposed lip 8 extending upwardly from flange 7`.

In the particular form of duct illustrated, the vertical height thereof is adjustable by movingthe top members up or down relatively to the bottom channel 1 by means of `adjusting screws 9, the elements being secured in adjusted position by means of hold down screws 9a.

The closure mounting strip in accordance with the invention comprises `a metal or like strip 1d having opposed side faces 11 and 12 and opposed longitudinal edges 13. A flange 14 extends perpendicularly from side face 11 adjoining an edge 13, and a flange 15 extends perpendicularly from sfide face 12 adjoining the other edge 13. The ilanges 14 and 15 are of different height, i.e., llange 14 has a longitudinal edge 16 lying in a plane spaced from the adjoining face 11 a greater distance than the spacing between the longitudinal edge v,(17 of flange 15 from the side face 12. The difference in height is that of the thickness of the finishing lloor tile or like covering indicated at 18. For instance, this dillerence may be one-eighth inch. The flanges 14 and 15 are coextensive in length with the strip 10.

The duct cover plate is indicated at 19.

In use, with the adjusted duct in position in the floor, a strip 1li is placed upon each flange 7 of the top members ice 1 `5 with the face 12 thereof in engaging or facing relation to the llange 7. Each llange 15 is thus upwardly directed and is in substantial engagement with `a lip 8 and each flange 14 is downwardly directed and in substantial engagement with the opposed portion of a side wall 6.

The height of each flange 15 is such that its edge r17 is substantially flush with the edge of lip 8. The cover plate 19 may then be placed in position with its side edge portions engaging and overlying the side faces 12. It will be observed that the exposed face of cover plate is substantially flush with the edges 1'7 of the mounting strips.

The concrete or other cementitious flooring material 2i? is then poured whereby the exposed face 2d thereof is` substantially flush with the exposed face of the cover plate, the edges 17 of the mounting strips, and the edges of hips 8. No special care need be taken to protect the longitudinal edges 17 during the pouring or travelling steps incidental to the laying of the llooring material 2l); When the lloor 20 is completed, the cover plate 19 is removed and the strips 1)` are reversed in position. In

other words, each strip 1t) is turned to place its Iface 11 in engaging relation with flange '7 and its face 12 exposed, in such position flange 14 is upwardly directed and engaging a lip S and flange 15 is downwardly directed. ln this position, it will be observed that the edges 16 of the strips are spaced above the exposed face 21 of the concrete iloor Z0. `Since the edges 16 have been disposed within the duct during the placing of the floor 2t), they will be in fresh, clean and unmarred condition when the strips 10 are placed in reverse position. The cover plate 19' lis then replaced and the floor covering 18 laid with its exposed face 18a substantially flush with the edges 16 of the mounting strips. Each face 11 and 12 may be provided with a sealing gasket 22.

It will be observed that the right hand side of FIGURE ,f1 illustrates the position of strips 10 during the placing of iloor 2t)` while the left hand side of FIGURE 1 illustrates the position of the strips in the finished lloor.

I claim:

1. A closure mounting means for underfloor wiring ducts which comprises a strip having opposed side faces, opposed longitudinal edges, and a lange adjoining each said edge, one of said flanges extending angularly from and continuous to one of said side faces and the other of said flanges extending angularly from and contiguous to the other one of said side faces, each said ilange being substantially coextensive in length with said strip, each said flange having a planar edge surface in substantially parallel spaced relation to the adjoining one of said side faces, one of said flange edge surfaces being spaced from the adjoining one of said side faces a greater distance than the other of said flange edge surfaces is spaced from the adjoining one of said side faces whereby one of said flanges is of greater height `than the other of said llanges, and means forming a generally horizontal supporting surface for said strip, said strip having a first position on said supporting surface wherein one of said side surfaces of said strip is seated thereon and a second position on said supporting surface wherein the other of said side surfaces of said strip is seated Ithereon whereby in said first position said ilange of lesser height projects above said supporting surface and in said second position said llange of greater height projects above said supporting surface.

2. In an underfloor wiring duct having la top opening, a horizontally disposed supporting surface defining at least in part said top opening, a lip extending upwardly` from said supporting surface, and a closure plate arranged for support on said supporting surface, closure mounting n .3 contiguous to one of said side faces and the other of said flanges extending angularly from and contiguous to the other one of said side faces, each said flange beingvsubstantially coextensive Lin length with said strip, each said flange having a planar edge, surface in substantially parallel spaced relation to the Vadjoining one of said side faces, one of said ange edge surfaces being spaced from the adjoining one of said side faces a greater distance than the other of said flange edge surfaces is` spaced from fthe adjoining one of said side lfaces, whereby one of said flanges is of greater height than the other of said anges, and means forming a generally horizon-tal supporting surface for saiid strip, said strip having a first position on said supporting surface wherein one of said side surfaces of said strip is seated thereon and a second position on said supporting surface wherein the other of said side surfaces of said strip is seated thereon whereby in said rst posi tion said ange of lesser height projects above said supi porting surface and in said second position said flange of greater height projects above said supporting surface.

3. A closure mounting means as dened in claim 2, said strip ange of lesser height having an edge substanti-ally flush with the edge of said Ilip when one of said side faces is seated upon said supporting surface, sa'id strip flange of greater height having an edge projecting above said lip edge when the other of said side faces is seated upon said supporting surface.

References Cited in the file of this patent UNITED STATES PATENTS 2,763,294 Kennedy Sept. 18, 1956 2,812,654 Hoseason Nov. l12, 1957 2,936,092 Johnson May 10, 1960 y3,025,884- Iohnson Mar. 20, 1962 3,074,208 Seidel May 25, 1962

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2763294 *Oct 21, 1952Sep 18, 1956Nat Electric Prod CorpOutlet for underfloor header duct
US2812654 *Aug 6, 1953Nov 12, 1957Hoseason Harry JWire feeder floor duct
US2936092 *Jan 6, 1958May 10, 1960Porter Co Inc H KFlush linoleum pan for headerduct outlet
US3025884 *Apr 17, 1956Mar 20, 1962Porter Co Inc H KDuct outlet with adjustment for floor level
US3074208 *Mar 9, 1959Jan 22, 1963Rome Cable CorpCellular floor headertrough
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3204378 *Sep 19, 1962Sep 7, 1965Flexiflor Electrical Systems ITrench header ducts
US3262238 *Sep 30, 1963Jul 26, 1966Robertson Co H HElevated tile-stop member for adjustable electrical trench
US3494084 *Dec 19, 1966Feb 10, 1970Robertson Co H HVertically adjustable underfloor trench
US3494381 *Apr 6, 1966Feb 10, 1970Robertson Co H HConnecting means for trench cover plates
US3545150 *Oct 16, 1968Dec 8, 1970Square D CoUnderfloor wiring trench duct
US3594966 *Aug 14, 1969Jul 27, 1971Textron IncTile trim for trench duct cover plates
US4247738 *Jul 12, 1978Jan 27, 1981Marcellino BonatoFlush-mounting electrical box assembly having switch and socket holder frame for electrical building installations
US4404779 *Apr 16, 1981Sep 20, 1983Cts CorporationTrenchduct construction having adjustable lid-supporting means
US4612746 *Jan 22, 1985Sep 23, 1986Midland-Ross CorporationTrench duct and cover assembly
US4782889 *May 5, 1986Nov 8, 1988Bourne Richard CLow mass hydronic radiant floor system
US4874334 *Oct 18, 1988Oct 17, 1989Golden Michael DElectrical outlet positioner
US5161580 *Aug 27, 1990Nov 10, 1992Tyton CorporationCable duct fitting with removable cover
US5339586 *Nov 19, 1991Aug 23, 1994Centa Antony REdging strips for floorcoverings
US20070137133 *Nov 28, 2006Jun 21, 2007Bartoli N.V.Building system, beam element, column and method
USRE28756 *Mar 29, 1974Apr 6, 1976H. H. Robertson CompanyConnecting means for trench cover plates
Classifications
U.S. Classification52/220.5, 52/126.2, 220/3.4, 220/3.7, 138/92
International ClassificationH02B1/015, H02B1/04, E04F19/08, H02G3/04, H02G3/34, H02G3/30
Cooperative ClassificationH02G3/283, E04F19/08
European ClassificationH02G3/28F, E04F19/08