Abstract: Corundum-zirconia abrasive grains containing more than 50 wt % of an alumina-zirconia eutectic mixture. The grains contain 0.3 to 3% nitrogen, and more than 75% of the zirconia crystals are cubic in shape. The abrasive grains are of particular use for making grinding wheels, abrasive fabrics and papers, polishing compounds and sprayed abrasives.

Abstract: A fire retardant panel door and door frame that prevents the spread of fire through the door during a fire. The fire retardant panel door has at least one door panel and stiles and rails. The door panel includes an interior center composite section formed by a first plurality of layers of intumescent materials and a first plurality of layers of fire resistant materials disposed between and laminated to a pair of outer sections formed of wood for enclosing the interior center composite section to form a composite laminated door panel. Each of the stiles includes a first center core formed of wood enclosed by a second plurality of layers of intumescent materials and a second plurality of layers of fire resistant materials; and the second layers of intumescent and fire resistant materials are enclosed by a first applique layer formed of wood to form a composite laminated stile.

Abstract: A turbulent tassel column has an inflatable clear column member containing tassels held inside the column. The tassels circulate freely or are wall attached within the transparent column member. An inverted cone member held within the inflatable member directs airflow blowing tassels. The inverted cone member has an exit aperture and an input aperture. The input aperture receives airflow from the bottom of the column and directs airflow through an exit aperture. Tassels accumulating at the bottom of the input aperture receive airflow arriving from the bottom of the column at the input aperture.

Abstract: A high-ductility material or a high-ductility covering material is disposed on the outer circumferential surface of a member, such as a column, of a structure so as to confine expansion of apparent volume accompanying rupture of the member, to thereby control rupture of the member. The high-ductility material is a fibrous or rubber sheet material. The high-ductility material is disposed in such a manner as to surround the member. Alternatively, the high-ductility material is spirally wound or rolled on the member.

Abstract: An electronic apparatus with a rotatable hanger fixed on a rack, which has a first fixed portion. The electronic apparatus includes a housing and a rotatable element. In this case, the housing has a first pivoted portion. The rotatable element has a second pivoted portion and a second fixed portion. The second pivoted portion is pivoted with the first pivoted portion. When the rotatable element rotates to a first position, the second fixed portion contacts with the first fixed portion.

Abstract: A hinge for an enclosure is disclosed. The hinge includes a hinge rod and a bushing. The hinge rod is secured to one of a door and a door jamb of the enclosure. The bushing is secured to the other of the door and the door jamb of the enclosure. Moreover, the hinge rod slidably engages the bushing to allow the door to pivot about the door jamb.

Abstract: A collapsible shelter. One embodiment may include a lower shelter portion that has substantially rigid lower walls and a floor therein. An upper shelter portion that has substantially rigid upper walls and a roof is telescopingly coupled to the lower shelter portion such that the upper shelter portion is selectively vertically moveable relative to the lower shelter portion between a first collapsed position and a second extended position. In addition, the shelter may include a selectively releasable retainer assembly for selectively supporting the upper shelter portion relative to the lower shelter portion in the second extended position.

Abstract: A multiple-level bicycle storing system includes a framework with a vertical support and a mounting frame defining upper and lower storing spaces. Each storing space includes a receiver to hold a bicycle. The upper receiver has a distal end, a proximal end and a U-shaped channel along the top surface. The upper receiver is pivotally attached to the mounting frame, enabling the upper receiver to tilt from horizontal to a loading and unloading position. The proximal end of the upper receiver is located near the floor when pivoted into the loading and unloading position. The upper receiver pivots up from the loading and unloading position into the horizontal storage position. The bicycles and the storing spaces are enclosed, and a floor separates the lower storing space from the upper storing space. Each storing space includes a lockable door and conceals the pivot point, upper receiver and bicycles inside the enclosure.

Abstract: A knockdown gazebo is provided which is readily disassembled into small pieces of 4 feet or less in length so that, in its disassembled state, it can be transported in the backseat of almost any passenger automobile. The gazebo can also be fully assembled without ladders and without special tools. The roof structure includes a plurality of multi-sectional rafters and joists and four corner assembly for supporting the roof structure. Each corner assembly includes upper and lower sections and each upper and lower section includes first and second panels that are connected perpendicularly to each other. The assembled gazebo is extremely sturdy and durable. A fabric sheet is provided to cover the roof structure. The gazebo may be assembled by first connecting the roof structure and the upper sections of the corner assemblies together. The roof fabric is then applied to the roof without requiring the use of ladders.

Abstract: A modular frame connection is formed by abutting a front camming surface of a front camming end of a front fastening plate against a rear camming surface of a rear camming end of a rear fastening plate while a front pierced end of the front fastening plate and rear pierced end of the rear fastening plate are separated, inserting the front and rear camming ends between a front and rear flanges of a post or beam, rotating the front pierced end toward the rear pierced end until a front finger surface of the front camming end is disposed insertably between a front lip of the front flange and a web of the post or beam and abutably to the front flange and a front abutment surface substantially orthogonal to the front fastening plate is disposed abutably to the web, rotating the rear pierced end toward the front pierced end until a rear finger surface of the rear camming end is disposed insertably between a rear lip of the rear flange and the web of the post or beam and abutably to the rear flange and a rear abutmen

Abstract: This invention relates to a roofing system, to a roof panel therefor, and to a method of assembling a roof. According to the invention, there is provided a roofing system for a building, the building having four walls, an opposed two of the walls including gable means, the roofing system comprising a number of roof panels which can span the distance between the gable means and be supported thereby and a number of intermediate panels which cannot span the distance between the gable means, the roof panels and the intermediate panels having cooperating surfaces whereby the intermediate panels can be supported by the roof panels. The use of intermediate panels allows the installation of windows into the roof.

Abstract: A pedestal unit usable for a raised floor is disclosed which comprises: a pair of beams; and a pair of pedestal frames for supporting the beams at both ends of the beams, respectively. Each pedestal frame comprises: a pair of leg members; a pair of base plates for supporting the leg members; respectively, and a connecting member with a predetermined length for rigidly connecting the legs member each other with a predetermined interval. The pedestal frame may be installed under a middle portion of the beams, which frame may be installed after installation of pedestal frames at ends of beams for easy adjustment. Additional pedestal frames for supporting additional beams may be fixed to the pedestal frames or the beam. A supporting surface of leg member may have a mount provided by casting and be cut for accurate dimensions.

Abstract: A seismic-protection wheel locational anchorage is provided. The present seismic-protection wheel locational anchorage includes a first fastening member and a second fastening member. The first fastening member has a first horizontal part and a first perpendicular part vertically and downwardly extending from one end of the first horizontal part. The second fastening member has a second perpendicular part and a second horizontal part extending parallel from a lower end of the second perpendicular part. The first horizontal part of the first fastening member is fastened to the bottom of a machine frame. The second horizontal part is securely fastened to the ground. When the vertical level between the machine frame and the ground is appropriately adjusted, the first perpendicular part and the second perpendicular part are securely joined together so as to provide the seismic-protection wheel locational anchorage for the machine frame.

Abstract: Above-ground swimming pool, comprising at least one basin (1), consisting of a waterproof sheet (9) and of a supporting structure (2), further comprising an overflowing channel (3) contained in a space (V) of said supporting structure (2) defined between first support means, adjacent to said basin (1), and second support means, external to said first support means. The overflowing channel (3) may consists of an impermeable sheet (10) hooked to the supporting structure (2).

Abstract: A staircase assembly comprising a plurality of stringers, and; a plurality of stair units, having treads and risers wherein stair unit is secured by means of fastening means on each corner to said plurality of stringers, said stringers, having a diagonally shaped series of equally spaced substantially vertical structure notched out of one side to define the length and height of each step of the stair assembly. The said tread,-forming a channel by rolling the leading edge for holding the riser of the stair unit installed immediately below, and each stair unit is secured by means of fastening means on each corner to said plurality of stringers, said channels further engaging other stair unit laterally sliding for providing horizontal adjustability.

Abstract: A spiral stair that can be collapsed allowing the permanent footprint of the stair to be decreased or eliminated. The stair can be constructed of metal or other common material possessing sufficient strength and rigidity for the application. The stair can be constructed with either a fixed center pole along which then individual steps translate vertically or a telescoping center pole that can be collapsed in sections similar to an automatic antenna. The individual steps would be attached to the various sections and when the center pole is collapsed, the steps would be compressed with the pole into a smaller overall space. A stair could also be constructed in similar fashion to current spiral stairs except the stair case as a unit can be translated vertically, preferably the stair would be raised as a unit into an attic.

Abstract: A composite lintel structure is disclosed for spanning openings in a building structure and for supporting building materials thereon. The composite lintel structure has a vertical leg for affixation to a building structure and a horizontal leg for placement of one or more courses of building materials thereon. The materials of construction of the lintel structure are preferably selected from composites that are moisture impermeable and corrosion resistant. The lintel structure may also comprise one or more stiffeners rigidly or adjustably attached between the horizontal and vertical legs to accommodate load transference from the horizontal leg to the vertical leg of the lintel structure.

Abstract: Pieces that are components of a frame for a window having a threat side and a safe side include a base and a pressure plate that together form part of one of a sill section, a head section, and a jamb section of the window. The base and pressure plate are elongated in a longitudinal direction. The base has (1) an L-shaped cross-section at a near portion of the base to receive an end of a glazing unit from the threat side of the window, and (2) a first pocket formed in a far portion of the base and running in said longitudinal direction. The rear portion is closer to the threat side than the far portion. The pressure plate is to be assembled with the base so as to secure the glazing unit in the corner. Other embodiments are also described and claimed.

Abstract: A window assembly for a motor vehicle includes a sheet and a sealing element for a fixed window to be secured to the edge portion of a section of the vehicle body. The sealing element features a bonding portion, which is bonded to the inside of the sheet, and includes a sealing lip projecting from the bonding portion, which can be brought into contact with the edge portion of the vehicle body section. To facilitate repainting of the edge portion of the vehicle body section the sealing lip, over its length, features at least a first and second layer, which are arranged one over the other and are tightly bonded to one another. The first layer forms an external surface layer and exhibits a higher temperature resistance than the second layer.

Abstract: A reinforcement bar box including a plurality of reinforcement bars aligned at spaced intervals along a plate, and a cover that covers a portion of the reinforcement bars, the cover including a moisture absorbing material. The moisture absorbing material may have sufficient moisture absorbing capability so as to prevent concrete or cement from sticking to the reinforcement bars inside the reinforcement bar box.

Abstract: A wedge for an anchor system is disclosed. One embodiment of the wedge includes at least two circumferential wedge segments. Each segment defines an exterior tapered surface and an interior surface. The interior surface has gripping elements thereon. The gripping elements define a difference between a major diameter and a minor diameter of about 0.25 to 0.75 of an amount of a difference defined by a conventional thread having substantially a same axial spacing and major diameter as the gripping elements on the interior surface. Another embodiment of the wedge has an interior surface shaped to substantially conform to an exterior surface of a tendon.

Abstract: An anchor for engagement with a post-tension tendon includes an anchor base having a generally tapered wedge receiving bore. A sheath surrounds the anchor base. The sheath has a substantially cylindrical extension on one side of the anchor base for contacting the tendon at a distal end thereof from the anchor base. The extension is formed integrally with the sheath and has a seal disposed therein proximate the distal end. A cap having external threads thereon is for engaging corresponding internal mating threads on the sheath on a side of the anchor base opposite to the sheath extension. The cap has a tool engagement surface thereon to facilitate rotation by a tool for engagement with the sheath.

Abstract: A column and method for siding a wall to simulate wood log construction are described. The column (100) includes a partial cylinder core (101) having a channel (103) that complements the shape of the wall to which the column attaches. Lateral supports (117, 119) are attached to respective grooves (113, 115) along respective lateral edges (109, 111) that are formed at the intersection of the flat surfaces (105, 107) of the channel (103) and a curved surface (123). A decorative skin (121) attaches to the curved surface (123). In a siding system that simulates wood log construction, planks (200) are attached to wall adjacent to a column (100).

Abstract: An endpiece and method for siding a wall to simulate wood log construction are described. A generally cylindrical core (101) of the endpiece (100) has a curved surface (103), and a flat surface (105). A decorative skin (111) attached to the curved surface (103) has a cross-sectional arc that is greater than one hundred and eighty degrees. When an endpiece (100) is installed on a plank (200), a spline (117) that attaches along a lateral edge (109) of the endpiece interlocks with a bottom spline (215) of a plank (200). Also, a first offset (113) of the decorative skin (111) engages an upper lateral edge (207) of the plank (200). An end cap (301) attaches to a surface formed by an endpiece surface (305) and a plank surface (307).

Abstract: A support anchor for fastening to a vertical mullion of a curtain wall system is disclosed. The support anchor fastens to a hollow tongue web portion of the vertical mullion. This Abstract is provided to comply with rules requiring an Abstract that allows a searcher or other reader to quickly ascertain subject matter of the technical disclosure. This Abstract is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. 37 CFR 1.72(b).

Abstract: A method and apparatus for construction of an arch is disclosed, having at least one nailing strip or centering element that cooperates with an arch facade assembly to produce an arch. The nailing strip defines a tongue. The arch facade assembly defines a groove. The tongue of the nailing strip matingly engages the groove of the arch facade assembly to be optimally positioned within the opening in which the arch is to be constructed. The facade assembly is secured to the nailing strip to produce at least a portion of the arch.

Abstract: A protective baseboard for protecting a building wall in an industry requiring sanitary requirements. The protective baseboard is positionable substantially adjacent the ground surface. The protective baseboard includes a substantially rigid and substantially water proof casing. The casing defines a casing external wall, the casing external wall having a casing wall inner surface. The casing also defines a casing inner volume and a filling aperture extending therethrough. The casing is positionable in a predetermined relationship relative to the building wall. A filler is provided within the casing inner volume. The filler substantially contacts the casing inner surface for minimizing an amount of air between the filler and the casing external wall.

Abstract: An apparatus includes a predetermined size, shape, and thickness with a bolt hole adapted to receive a bolt therein and a method of attaching the apparatus to a ledger board sufficient to prevent rotation of the apparatus with respect to either the ledger board or the bolt hole. Modifications include securing the apparatus to the ledger board by the use of screws passing through a plurality of mounting holes provided in the apparatus or by the use of pointed protrusions that extend from the apparatus and which are pounded into the ledger board. Other modifications are described that include the use of intermediate shim spacers to vary the overall thickness of the spacer and of angled spacers for use with beveled types of siding.

Abstract: A hold-down system used to secure a building structure to a foundation, thereby enabling the building to better withstand high winds, earthquakes, and the like. The hold-down system is characterized as being continuous and having stackable, individual take-up devices. A continuous hold-down system may include an anchor extending from the foundation through the various stories of the building structure. One or more take-up devices may limit the motion of selected stories with respect to the anchor. Accordingly, the individual take-up devices, acting alone or in a stacked configuration, compensate for settling, wood shrinkage, wood crushing, and the like throughout the entire height of the building structure.

Abstract: The waterproof decking is decking made from extruded panels for forming a watertight deck assembly. First side, second side, and intermediate panels are provided, each having complementary edges for mating with other corresponding panels. One edge of the first side and intermediate panels is provided with a drainage gutter and the tongue or groove of a tongue and groove connection, with mating edges of the second side and intermediate panels being provided with the mating tongue or groove configuration. The decking includes a depending drip rail which serves to wedge tightly against the opposite wall of the gutter of the adjoining panel to prevent relative motion between the two, and also to prevent capillary flow of liquid across the underside of the panel where it could leak into the area below. Additional sealing may be provided along the tongue and groove joints.

Abstract: An improved panel section for use in a sound barrier is disclosed and is of the type: having a cementitious body; for use with at least two vertically-extending, ground-mounted I-beam columns, each having two parallel flanges and a transverse web extending therebetween and being positioned with its web substantially parallel to the web of adjacent columns and substantially normal to a line defined by said columns; and disposed, in use, in respective vertically-stacked groupings to form one or more wall panels interleaved between adjacent pairs of columns, each panel having a pair of end edges disposed, one each, in mechanically-engaged relation, between the flanges of a respective pair of adjacent columns. The improvement comprises: the body having defined therethrough an opening; and a glazing element secured to said body to occlude said opening and impede sound passage therethrough. A sound barrier constructed from the improved panel section is also disclosed.

Abstract: A rigid foam building panel includes a rigid foam body with elongate reinforcing studs. The rigid foam body has a first face, a second face, a top edge, a bottom edge and opposed side edges. Integrally formed non-planar architectural features are positioned on at least one of the first face or the second face.

Abstract: A rigid foam building component includes a rigid foam body with at least one reinforcing stud insert. The rigid foam body has a first planar portion, which intersects a second planar portion. The reinforcing stud insert has a first side, a second side and a connecting web connecting the first side and the second side. The connecting web consists of at least two conjoined intersecting planar portions. The reinforcing stud insert is positioned at an intersection between the first planar portion and the second planar portion, with a first of the at least two conjoined intersecting planar portions reinforcing the first planar portion and a second of the at least two conjoined intersection planar portions reinforcing the second planar portion.

Abstract: This invention relates to a method and a system for attaching wall surfacing panels onto a flat wall, in which magnetic elements and magnetic force are applied, so that the wall surfacing panel is repositionable during installation and completely removable after installation.

Abstract: A support panel comprising a plate including a face, at least one row of support tabs and at least one row of L-shaped fingers. The at least one row of L-shaped fingers are located above at least one of the at least one row of support tabs. The L-shaped fingers include a first portion and a second portion defining the L-shape of the L-shaped fingers. A tile can be placed on at least one of the tabs and maintained in position by the second portion of at least one of the L-shaped fingers. Alternatively, the plate could include at least one row of upwardly and outwardly angled tongues for insertion into at least one angled slot in a rear face of a tile to maintain the tiles in position adjacent a front of the plate.

Abstract: A fully insulated timber frame building panel system incorporating wall, ceiling and floor panels of varying dimensions which are made up of vertical timbers 20 and horizontal timbers 34 & 36 sheathed both sides 21 & 22 to create a cavity which is filled with expanding polyurethane insulation 27. Breather membrane 24 is then attached to the external face of the panel and heat reflecting membrane 25 to the internal face. Battens 23 & 38 are applied to the internal face of the panel, which is then sheathed in gypsum based boards 32 to form an air gap 29. Extruded polyurethane insulation 26 is fixed to the panel through the breather membrane 24. External cladding 31 is always fixed to the timber frame to create a cavity 30. This external cladding can be of a variety of materials.

Abstract: A faced fibrous insulation having a facing on one or more surfaces of a fibrous insulation material is provided. The facing provides improved surface quality, high and controlled adhesion, and is easily manufactured. The facing of the present invention includes a pre-applied adhesive that is heat activated to provide adhesion to the fibrous insulation. The facing may be input into the glass fiber forming section of a fibrous insulation production line. Alternatively, the facing may be applied to the uncured pack prior to curing or applied to the cured fibrous insulation. As another alternative, a vapor barrier layer may be attached on a surface of the insulation opposite the facing.

Abstract: A fixing system for fixing a panel of fragile material to a bearing structure, including at least one point fastener engaging with at least one first contact region produced in the panel. The point fastener includes a first anchoring part at a first contact region and a second anchoring part at a second contact region situated on the panel. The first and second anchoring parts are connected by at least one adjusting device configured to bring the first and second anchoring parts to bear against the first and second contact regions respectively and are situated in the plane of the panel.

Abstract: A combination structure of a Do-It-Yourself (DIY) solid wood flooring each unit of which having a plastic base and a solid wood panel. The plastic base is constructed as an elongated body and made of plastics by an injection molding procedure. The plastic base includes a smooth surface and a hollow bottom side with a plurality of supporting feet for providing a sufficient supporting force to the solid wood panel. Two adjacent sides of the plastic base are respectively fitted with a female portion having a U-shaped cross section while the other adjacent sides thereof are respectively provided with a male portion downwardly extended therefrom and tightly fittable into the female portion. The solid wood panel is adapted to the dimensions of the smooth surface of the plastic base and glued thereover.

Abstract: A steel roofing panel support system is disclosed herein. The system generally includes a support element positioned on a roof surface, the support being configured to support at least a portion of a steel roof panel to be placed thereon. The support element may be cut from a block of expanded polystyrene such that the support is substantially wedge-shaped. A support element as disclosed herein may also be used in installations of steel panels over existing wood shakes or other roof surfaces.

Abstract: A structure used in bus shelters, smoking shelters, etc, has hollow, extruded post sections to support the roof, each post having at least one substantially smooth face, at least one adjoining face having a projecting panel receiver section along its length, to receive a glazing panel. Glazing snap members secure the glazing panel to the glazing receiver, with snap-retention rib projections extending parallel with the glazing receiver section, removably securing the glazing snap. The two-element system provides longitudinally reversible corner posts and a mid-post, with free sides that may be curved, and radiused corners, as are the glazing receiver sections and the glazing snap. The latter two have recesses for extruded rubber seals. The corner and mid-post may be oriented with the glazing snaps located within the structure, for unrestricted installation and/or removal of the glazing panels from inside the structure.

Abstract: A multi-layered roofing shingle is described. The layers of the shingle are connected via a mechanical fastener. A method for manufacturing a multi-layered shingle is also described. The method includes aligning the layers of the shingle, and connecting the layers via at least one mechanical fastener. Further described is a multi-layered shingle having layers that are mechanically fastened by deforming one of the layers into one of the other layers.

Abstract: Construction element for forming a reinforced concrete slab (2), consisting of the combination of at least a hardened concrete layer (3), at least a number of reinforcement elements (4) and elements (5) extending at least partially from the concrete layer (3) and defining cavities (6), whereby these elements (5) are designed to be covered with concrete (7) at a later stage characterised in that the above-mentioned elements (5) defining the cavities (6) consist of elements (5) which can be mutually nested as such.

Abstract: An extrusion for use in a floor assembly including a load bearing horizontal portion and at least one horizontal support member in a substantially parallel horizontal plane, and a plurality of leg members extending downwardly from the load bearing horizontal portion. The extrusion also includes a tongue extending outwardly from a first outside surface thereof and a receiving portion provided at the second outside surface thereof that is sized and positioned to receive therein a tongue of a second extrusion forming a part of the floor assembly. The second outside surface also includes at least one aperture that is sized and positioned to receive therethrough at least one fastener for securing the extrusion to a rigid underlying support such as a plurality of wood joists.

Abstract: A prefabricated shearwall including a central diaphragm having a height generally defined by top and bottom edges, and a width generally defined by a pair of end sections. The diaphragm further includes at least one corrugation extending in the height direction at least partially between the top and bottom edges. The corrugation increases the ductility and ability of the shearwall to withstand lateral forces such as those generated in earthquakes, high winds, floods and snow loads. The various components of the shearwall may be affixed to each other by welding, bolting, screwing and/or gluing.

Abstract: A panel lock building system is provided that includes a plurality of side panels forming an enclosure of a predetermined configuration. The system further includes a first hinge half attached to a first side edge of a plurality of the plurality of side panels and a second hinge half attached to a second side edge of a plurality of the plurality of side panels, such that each first hinge half is interlockingly coupled to a corresponding one of the second hinge halves to couple adjacent ones of the side panels.

Abstract: Floor covering, including hard floor panels which, at least at the edges of two opposite sides, are provided with coupling parts, cooperating which each other, substantially in the form of a tongue and a groove, wherein the coupling parts are provided with integrated mechanical locking elements which prevent the drifting apart of two coupled floor panels in a direction (R) perpendicular to the related edges and parallel to the underside of the coupled floor panels, and provide a snap-action coupling.

Abstract: Floor covering, including hard floor panels which, at least at the edges of two opposite sides, are provided with coupling parts, cooperating which each other, substantially in the form of a tongue and a groove, wherein the coupling parts are provided with integrated mechanical locking elements which prevent the drifting apart of two coupled floor panels in a direction (R) perpendicular to the related edges and parallel to the underside of the coupled floor panels, and provide a snap-action coupling.

Abstract: Concrete molded fence blocks are provided having cores for receiving mortar or aggregate, and pin openings for receiving pins that interlock and align abutting courses of blocks in a fence block system. Groups of a column of blocks form a column support. Standard blocks are provided as spans between the column supports. Column blocks provide additional structural integrity to the fence system, and are larger in comparison to the standard blocks. The leading and trailing edges of the standard blocks have complimentary shapes to provide further interlocking capability between individual blocks. Various types of column blocks are provided for managing the layout of a particular fence system.

Abstract: In accordance with the present invention, there is provided a timber formwork I-beam which incorporates a bolt receiving channel. The I-beam is formed from an elongated generally planar web member of laminated wood having opposite side edges. A first elongated rectangular wooden flange is rigidly attached to one of the side edges and a second elongated rectangular wooden flange is rigidly attached to the opposite side edge, the first and second flanges extending substantially along the entire length of the web portion. The second elongated flange has opposite first and second sides, the web being rigidly attached to the first side. An elongated metal conduit is contained within the second flange between the first and second sides, the conduit extending along the length of the flange. The conduit defines an elongated passage extending along the conduit. The second flange has an elongated slot opening on the second side, said slot communicating with the passage of the conduit.