Grooved structural element

Claim 2

A wall that has an aperture therein and that includes an elongated base member, an elongated top member disposed above and in vertical registry with said base member, a vertically-directed member extending between said base member and said top member, a second vertically-directed member extending between said base member and said top member, said second vertically-directed member being laterally displaced from the first said verticallydirected member, a spacing member extending between said base member and said top member, said spacing member being laterally displaced from said first said vertically-directed member and from said second vertically-directed member, said members being frame-defining members which coact to define a frame for said wall, a plurality of aperture-defining members which coact to define said aperture for said wall, said base member having a horizontally-directed web, said top member having a horizontallydirected web parallel to said web of said base member, said first said vertically-directed member having a vertically-directed web which is normal to said web of said base member and which also is normal to said web of said top member, said second verticallydirected member having a vertically-directed web which is parallel to said web of said first said vertically-directed member and which is normal to said web of said base member and which also is normal to said web of said top member, said spacing member having a web, each of said aperture-defining members having a web, a plural-arm locking member having one arm thereof abutting one portion of said web of said base member and having another arm thereof abutting one portion of said web of said first said vertically-directed member, a second plural-arm locking member having one arm thereof abutting a second portion of said web of said base member and having another arm thereof abutting one portion of said web of said second verticallydirected member, a third plural-arm locking member having one arm thereof abutting one portion of said web of said top member and having another arm thereof abutting a second portion of said web of said first said vertically-directed member, a fourth pluralarm locking member having one arm thereof abutting a second portion of said web of said top member and having another arm thereof abutting a second portion of said web of said second vertically-directed member, a fifth plural-arm locking member having one arm thereof abutting one portion of said web of said spacing member and having another arm thereof abutting a third portion of said web of said base member, a sixth plural-arm locking member having one arm thereof abutting a second portion of said web of said spacing member and having another arm thereof abutting a third portion of said web of said top member, further plural-arm locking members having arms thereof abutting said webs of said aperture-defining members, each of said aperture-defining members and some of said frame-defining members having elongaTed, parallel, transversely-spaced grooves, said elongated, parallel, transversely-spaced grooves of said aperture-defining members facing outwardly and away from said aperture, said elongated, parallel, transversely-spaced grooves of said some frame-defining members facing inwardly of said frame, said elongated, parallel, transversely-spaced grooves of said aperture-defining members confronting and being in register with said transversely-spaced grooves in a plurality of said some frame-defining members, each of said transversely-spaced grooves in said aperture-defining members having substantial portions of the confronting surfaces of the walls thereof parallel to each other, said transverselyspaced grooves in contiguous members of said some frame-defining members being aligned and in communication with each other, said transversely-spaced grooves in contiguous members of said aperture-defining members being aligned and in communication with each other, fasteners which are positively and mechanically secured to said first said, second, third, fourth, fifth and sixth locking members, further fasteners which are positively and mechanically secured to said further locking members, a plurality of panels which coact to define a plane and which have edges thereof extending into and held by one of said transverselyspaced grooves in said some frame-defining members, a second plurality of panels which coact to define a second plane and which have edges thereof extending into and held by the second of said transversely-spaced grooves in said some frame-defining members, at least one of said panels of the first said plurality of panels having an edge thereof extending into and held by one of said transversely-spaced grooves in at least one of said aperture-defining members, at least one of said panels of said second plurality of panels having an edge thereof extending into and held by the second of said transversely-spaced grooves in said one of said aperture-defining members, the panels of said first said plurality of panels coacting to define a first surface for said wall, the panels of said second plurality of panels coacting to define a second surface for said wall, said aperturedefining members and said frame-defining members coacting with said first said and said second plurality of panels to bound and define an insulating space which is located within said wall and which is intermediate said aperture and the outer periphery of said frame, said top member having elongated ribs thereon which are spaced apart but which are in register with each other and which extend toward each other, said ribs being parallel to but spaced short distances away from said web of said top member to define transversely-spaced slots that receive and confine both side edges of said one arm of said third locking member and of said one arm of said fourth locking member and of said other arm of said sixth locking member, whereby said third locking member engages and is secured to and confined by said top member and whereby said fourth locking member engages and is secured to and confined by said top member and whereby said sixth locking member engages and is secured to and confined by said top member, said first said vertically-directed member having elongated ribs thereon which are spaced apart but which are in register with each other and which extend toward each other, said ribs being parallel to but spaced short distances away from said web of said first said vertically-directed member to define transverselyspaced slots that receive and confine both side edges of said other arm of said third locking member and of said other arm of said first said locking member, whereby said third locking member engages and is secured to and confined by said first said vertically-directed member and whereby said first said locking member engages and is secured to and confined by said first said vertically-directed member, said third locking member coating with one of the first said fasteners and with said ribs on said top member to provide three transversely-spaced points of securement between said top member and said third locking member to rigidly lock said third locking member to said top member and thereby fix the location of said first said vertically-directed member relative to said top member, said second verticallydirected member having elongated ribs thereon which are spaced apart but which are in register with each other and which extend toward each other, said ribs being parallel to but spaced short distances away from said web of said second vertically-directed member to define transversely-spaced slots that receive and confine both side edges of said other arm of said fourth locking member and of said other arm of said second locking member, whereby said fourth locking member engages and is secured to and confined by said second vertically-directed member and whereby said

Claim 3

A wall that includes an elongated base member, an elongated top member disposed above and in vertical registry with said base member, a vertically-directed member extending between said base member and said top member, a second vertically-directed member extending between said base member and said top member, said second vertically-directed member being laterally displaced from the first said vertically-directed member, said members being frame-defining members which coact to define a frame for said wall, said base member having a horizontally-directed web, said top member having a horizontally-directed web parallel to said web of said base member, said first said vertically-directed member having a vertically-directed web which is normal to said web of said base member and which also is normal to said web of said top member, said second vertically-directed member having a vertically-directed web which is parallel to said web of said first said vertically-directed member and which is normal to said web of said base member and which also is normal to said web of said top member, a plural-arm locking member having one arm thereof abutting one portion of said web of said base member and having another arm thereof abutting one portion of said web of said first said vertically-directed member, a second plural-arm locking member having one arm thereof abutting a second portion of said web of said base member and having another arm thereof abutting one portion of said web of said second vertically-directed member, a third plural-arm locking member having one arm thereof abutting one portion of said web of said top member and having another arm thereof abutting a second portion of said web of said first said vertically-directed member, a fourth plural-arm locking member having one arm thereof abutting a second portion of said web of said top member and having another arm thereof abutting a second portion of said web of said second vertically-directed member, some of said frame-defining members having elongated, parallel, transversely-spaced grooves, said elongated, parallel, transversely-spacEd grooves of said some frame-defining members facing inwardly of said frame, said transversely-spaced grooves in contiguous members of said some frame-defining members being aligned and in communication with each other, fasteners which are positively and mechanically secured to said first said, second, third and fourth locking members, a plurality of panels which coact to define a plane and which have edges thereof extending into and held by one of said transversely-spaced grooves in said some frame-defining members, a second plurality of panels which coact to define a second plane and which have edges thereof extending into and held by the second of said transversely-spaced grooves in said some frame-defining members, the panels of said first said plurality of panels coacting to define a first surface for said wall, the panels of said second plurality of panels coacting to define a second surface for said wall, said frame-defining members coacting with said first said and said second plurality of panels to bound and define an insulating space which is located within said wall, said first said vertically-directed member being disposed intermediate the ends of said wall, said first said vertically-directed member having elongated, vertically-directed, parallel, transversely-spaced flanges at the opposite edges of said vertically-directed web thereof, one of said elongated, vertically-directed, parallel, transversely-spaced flanges of said first said vertically-directed member extending outwardly beyond both faces of said vertically-directed web of said first said vertically-directed member, the other of said elongated, vertically-directed, parallel, transversely-spaced flanges of said first said vertically-directed member also extending outwardly beyond both faces of said vertically-directed web of said first said vertically-directed member, said one of said elongated, vertically-directed, parallel, transversely-spaced flanges of said first said vertically-directed member receiving and helping hold one portion of one panel of said first plurality of panels, the other of said elongated, vertically-directed, parallel, transversely-spaced flanges of said first said vertically-directed member receiving and helping hold one portion of one panel of said second plurality of panels, the other of said elongated, vertically-directed, parallel, transversely-spaced flanges of said first said vertically-directed member receiving and helping hold one portion of one panel of said second plurality of panels, said top member having elongated ribs thereon which are spaced apart but which are in register with each other and which extend toward each other, said ribs being parallel to but spaced short distances away from said web of said top member to define transversely-spaced slots that receive and confine both side edges of said one arm of said third locking member and of said one arm of said fourth locking member, whereby said third locking member engages and is secured to and confined by said top member and whereby said fourth locking member engages and is secured to and confined by said top member, said first said vertically-directed member having elongated ribs thereon which are spaced apart but which are in register with each other and which extend toward each other and which are normal to said elongated, vertically-directed, parallel, transversely-spaced flanges of said first said vertically-directed member, said ribs being parallel to but spaced short distances away from said web of said first said vertically-directed member to define transversely-spaced slots that receive and confine both side edges of said other arm of said third locking member and of said other arm of said first said locking member, whereby said third locking member engages and is secured to and confined by said first said vertically-directed member and whereby said first said locking member engages and is secured to and confined by said first said vertically-directed member, said third locking member coacting wiTh one of said fasteners and with said ribs on said top member to provide three transversely-spaced points of securement between said top member and said third locking member to rigidly lock said third locking member to said top member and thereby fix the location of said first said vertically-directed member relative to said top member, said second vertically-directed member having elongated ribs thereon which are spaced apart but which are in register with each other and which extend toward each other, said ribs being parallel to but spaced short distances away from said web of said second vertically-directed member to define transversely-spaced slots that receive and confine both side edges of said other arm of said fourth locking member and of said other arm of said second locking member, whereby said fourth locking member engages and is secured to and confined by said second vertically-directed member and whereby said second locking member engages and is secured to and confined by said second vertically-directed member, said fourth locking member coacting with one of said fasteners and with said ribs on said top member to provide three transversely-spaced points of securement between said top member and said fourth locking member to rigidly lock said fourth locking member to said top member and thereby fix the location of said second vertically-directed member relative to said top member, said base member having elongated ribs thereon which are spaced apart but which are in register with each other and which extend toward each other, said ribs being parallel to but spaced short distances away from said web of said base member to define transversely-spaced slots that receive and confine both side edges of said

Claim 4

A wall that includes an elongated base member, an elongated top member disposed above and in vertical registry with said base member, a vertically-directed member extending between said base member and said top member, a second vertically-directed member extending between said base member and said top member, said second vertically-directed member being laterally displaced from the first said vertically-directed member, said members being frame-defining members which coact to define a frame for said wall, said base member having a horizontally-directed web, said top member having a horizontally-directed web parallel to said web of said base member, said first said vertically-directed member having a vertically-directed web which is normal to said web of said base member and which also is normal to said web of said top member, said second vertically-directed member having a vertically-directed web which is parallel to said web of said first said vertically-directed member and which is normal to said web of said base member and which also is normal to said web of said top member, a plural-arm locking member having one arm thereof abutting one portion of said web of said base member and having another arm thereof abutting one portion of said web of said first said vertically-directed member, a second plural-arm locking member having one arm thereof abutting a second portion of said web of said base member and having another arm thereof abutting one portion of said web of said second vertically-directed member, a third plural-arm locking member having one arm thereof abutting one portion of said web of said top member and having another arm thereof abutting a second portion of said web of said first said vertically-directed member, a fourth plural-arm locking member having one arm thereof abutting a second portion of said web of said top member and having another arm thereof abutting a second portion of said web of said second vertically-directed member, some of said frame-defining members having elongated, parallel, transversely-spaced grooves, said elongated, parallel, transversely-spacEd grooves of said some frame-defining members facing inwardly of said frame, said transversely-spaced grooves in contiguous members of said some frame-defining members being aligned and in communication with each other, fasteners which are positively and mechanically secured to said first said, second, third and fourth locking members, a plurality of panels which coact to define a plane and which have edges thereof extending into and held by one of said transversely-spaced grooves in said some frame-defining members, a second plurality of panels which coact to define a second plane and which have edges thereof extending into and held by the second of said transversely-spaced grooves in said some frame-defining members, the panels of said first said plurality of panels coacting to define a first surface for said wall, the panels of said second plurality of panels coacting to define a second surface for said wall, said frame-defining members coacting with said first said and said second plurality of panels to bound and define an insulating space which is located within said wall, said first said vertically-directed member being disposed intermediate the ends of said wall, said first said vertically-directed member having elongated, vertically-directed, parallel, transversely-spaced flanges at the opposite edges of said vertically-directed web thereof, one of said elongated, vertically-directed, parallel, transversely-spaced flanges of said first said vertically-directed member extending outwardly beyond both faces of said vertically-directed web of said first said vertically-directed member, the other of said elongated, vertically-directed, parallel, transversely-spaced flanges of said first said vertically-directed member also extending outwardly beyond both faces of said vertically-directed web of said first said vertically-directed member, said one of said elongated, vertically-directed, parallel, transversely-spaced flanges of said first said vertically-directed member receiving and helping hold one portion of one panel of said first plurality of panels, the other of said elongated, vertically-directed, parallel, transversely-spaced flanges of said first said vertically-directed member receiving and helping hold one portion of one panel of said second plurality of panels, the other of said elongated, vertically-directed, parallel, transversely-spaced flanges of said first said vertically-directed member receiving and helping hold one portion of one panel of said second plurality of panels, said top member having elongated ribs thereon which are spaced apart but which are in register with each other and which extend toward each other, said ribs being parallel to but spaced short distances away from said web of said top member to define transversely-spaced slots that receive and confine both side edges of said one arm of said third locking member and of said one arm of said fourth locking member, whereby said third locking member engages and is secured to and confined by said top member and whereby said fourth locking member engages and is secured to and confined by said top member, said first said vertically-directed member having elongated ribs thereon which are spaced apart but which are in register with each other and which extend toward each other and which are normal to said elongated, vertically-directed, parallel, transversely-spaced flanges of said first said vertically-directed member, said ribs being parallel to but spaced short distances away from said web of said first said vertically-directed member to define transversely-spaced slots that receive and confine both side edges of said other arm of said third locking member and of said other arm of said first said locking member, whereby said third locking member engages and is secured to and confined by said first said vertically-directed member and whereby said first said locking member engages and is secured to and confined by said first said vertically-directed member, said third locking member coacting wiTh one of said fasteners and with said ribs on said top member to provide three transversely-spaced points of securement between said top member and said third locking member to rigidly lock said third locking member to said top member and thereby fix the location of said first said vertically-directed member relative to said top member, said second vertically-directed member having elongated ribs thereon which are spaced apart but which are in register with each other and which extend toward each other, said ribs being parallel to but spaced short distances away from said web of said second vertically-directed member to define transversely-spaced slots that receive and confine both side edges of said other arm of said fourth locking member and of said other arm of said second locking member, whereby said fourth locking member engages and is secured to and confined by said second vertically-directed member and whereby said second locking member engages and is secured to and confined by said second vertically-directed member, said fourth locking member coacting with one of said fasteners and with said ribs on said top member to provide three transversely-spaced points of securement between said top member and said fourth locking member to rigidly lock said fourth locking member to said top member and thereby fix the location of said second vertically-directed member relative to said top member, said base member having elongated ribs thereon which are spaced apart but which are in register with each other and which extend toward each other, said ribs being parallel to but spaced short distances away from said web of said base member to define transversely-spaced slots that receive and confine both side edges of said

Claim 5

A wall that includes an elongated base member, an elongated top member disposed above and in vertical registry with said base member, a vertically-directed member extending between said base member and said top member, a second vertically-directed member extending between said base member and said top member, said second vertically-directed member being laterally displaced from the first said vertically-directed member, a plurality of spacing members extending between said base member and said top member, said spacing members being laterally displaced from said first said vertically-directed member and from saId second vertically-directed member, said members being frame-defining members which coact to define a frame for said wall, said base member having a horizontally-directed web, said top member having a horizontally-directed web parallel to said web of said base member, said first said vertically-directed member having a vertically-directed web which is normal to said web of said base member and which also is normal to said web of said top member, said second vertically-directed member having a vertically-directed web which is parallel to said web of said first said vertically-directed member and which is normal to said web of said base member and which also is normal to said web of said top member, each of said spacing members having a web, a plural-arm locking member having one arm thereof abutting one portion of said web of said base member and having another arm thereof abutting one portion of said web of said first said vertically-directed member, a second plural-arm locking member having one arm thereof abutting a second portion of said web of said base member and having another arm thereof abutting one portion of said web of said second vertically-directed member, a third plural-arm locking member having one arm thereof abutting one portion of said web of said top member and having another arm thereof abutting a second portion of said web of said first said vertically-directed member, a fourth plural-arm locking member having one arm thereof abutting a second portion of said web of said top member and having another arm thereof abutting a second portion of said web of said second vertically-directed member, further plural-arm locking members, each of said further plural-arm locking members having one arm thereof abutting one portion of the web of one of said spacing members and having another arm thereof abutting a portion of said web of said base member, still further plural-arm locking members, each of said still further plural-arm locking members having one arm thereof abutting one portion of the web of one of said spacing members and having another arm thereof abutting a portion of said web of said top member, some of said frame-defining members having elongated, parallel, transversely-spaced grooves, said elongated, parallel, transversely-spaced grooves of said some frame-defining members facing inwardly of said frame, said transversely-spaced grooves in contiguous members of said some frame-defining members being aligned and in communication with each other, fasteners which are positively and mechanically secured to said first said, second, third, fourth, further, and still further locking members, a plurality of panels which coact to define a plane and which have edges thereof extending into and held by one of said transversely-spaced grooves in said some frame-defining members, a second plurality of panels which coact to define a second plane and which have edges thereof extending into and held by the second of said transversely-spaced grooves in said some frame-defining members, the panels of said first said plurality of panels coacting to define a first surface for said wall, the panels of said second plurality of panels coacting to define a second surface for said wall, said frame-defining members coacting with said first said and said second plurality of panels to bound and define an insulating space which is located within said wall, said top member having elongated ribs thereon which are spaced apart but which are in register with each other and which extend toward each other, said ribs being parallel to but spaced short distances away from said web of said top member to define transversely-spaced slots that receive and confine both side edges of said one arm of said third locking member and of said one arm of said fourth locking member and of said other arms of said still further locking members, whereby said third locking member engages and is secured to and confined by said top member and whereby said fourth locking member engages and is secured to and confined by said top member and whereby said still further locking members engage and are secured to and confined by said top member, said first said vertically-directed member having elongated ribs thereon which are spaced apart but which are in register with each other and which extend toward each other, said ribs being parallel to but spaced short distances away from said web of said first said vertically-directed member to define transverse-spaced slots that receive and confine both side edges of said other arm of said third locking member and of said other arm of said first said locking member, whereby said third locking member engages and is secured to and confined by said first said vertically-directed member and whereby said first said locking member engages and is secured to and confined by said first said vertically-directed member, said third locking member coacting with one of said fasteners and with said ribs on said top member to provide three transversely-spaced points of securement between said top member and said third locking member to rigidly lock said third locking member to said top member and thereby fix the location of said first said vertically-directed member relative to said top member, said second vertically-directed member having elongated ribs thereon which are spaced apart but which are in register with each other and which extend toward each other, said ribs being parallel to but spaced short distances away from said web of said second vertically-directed member to define transversely-spaced slots that receive and confine both side edges of said other arm of said fourth locking and of said other arm of said second locking member, whereby said fourth locking member engages and is secured to and confined by said second vertically-directed member and whereby said second locking member engages and is secured to and confined by said second vertically-directed member, said fourth locking member coacting with one of said fasteners and with said ribs on said top member to provide three transversely-spaced points of securement between said top member and said fourth locking member to rigidly lock said fourth locking member to said top member and thereby fix the location of said second vertically-directed member relative to said top member, said base member having elongated ribs thereon which are spaced apart but which are in register with each other and which extend toward each other, said ribs being parallel to but spaced short distances away from said web of said base member to define transversely-spaced slots that receive and confine both side edges of said one arm of the first said locking member and of said one arm of said second locking member and of said other arms of said further locking members, whereby said second locking member engages and is secured to and confined by said base member and whereby said first said locking member engages and is secured to and confined by said base member and whereby said further locking members engage and are secured to and confined by said base member, said first said locking member coacting with one of said fasteners and with said ribs on said base member to provide three transversely-spaced points of securement between said base member and said first said locking member to

Claim 6

A wall that includes an elongated base member, an elongated top member disposed above and in vertical registry with said base member, a vertically-directed member extending between said base member and said top member, a second vertically-directed member extending between said base member and said top member, said second vertically-directed member being laterally displaced from the first said vertically-directed member, a plurality of spacing members extending between said base member and said top member, said spacing members being laterally displaced from said first said vertically-directed member and from saId second vertically-directed member, said members being frame-defining members which coact to define a frame for said wall, said base member having a horizontally-directed web, said top member having a horizontally-directed web parallel to said web of said base member, said first said vertically-directed member having a vertically-directed web which is normal to said web of said base member and which also is normal to said web of said top member, said second vertically-directed member having a vertically-directed web which is parallel to said web of said first said vertically-directed member and which is normal to said web of said base member and which also is normal to said web of said top member, each of said spacing members having a web, a plural-arm locking member having one arm thereof abutting one portion of said web of said base member and having another arm thereof abutting one portion of said web of said first said vertically-directed member, a second plural-arm locking member having one arm thereof abutting a second portion of said web of said base member and having another arm thereof abutting one portion of said web of said second vertically-directed member, a third plural-arm locking member having one arm thereof abutting one portion of said web of said top member and having another arm thereof abutting a second portion of said web of said first said vertically-directed member, a fourth plural-arm locking member having one arm thereof abutting a second portion of said web of said top member and having another arm thereof abutting a second portion of said web of said second vertically-directed member, further plural-arm locking members, each of said further plural-arm locking members having one arm thereof abutting one portion of the web of one of said spacing members and having another arm thereof abutting a portion of said web of said base member, still further plural-arm locking members, each of said still further plural-arm locking members having one arm thereof abutting one portion of the web of one of said spacing members and having another arm thereof abutting a portion of said web of said top member, some of said frame-defining members having elongated, parallel, transversely-spaced grooves, said elongated, parallel, transversely-spaced grooves of said some frame-defining members facing inwardly of said frame, said transversely-spaced grooves in contiguous members of said some frame-defining members being aligned and in communication with each other, fasteners which are positively and mechanically secured to said first said, second, third, fourth, further, and still further locking members, a plurality of panels which coact to define a plane and which have edges thereof extending into and held by one of said transversely-spaced grooves in said some frame-defining members, a second plurality of panels which coact to define a second plane and which have edges thereof extending into and held by the second of said transversely-spaced grooves in said some frame-defining members, the panels of said first said plurality of panels coacting to define a first surface for said wall, the panels of said second plurality of panels coacting to define a second surface for said wall, said frame-defining members coacting with said first said and said second plurality of panels to bound and define an insulating space which is located within said wall, said top member having elongated ribs thereon which are spaced apart but which are in register with each other and which extend toward each other, said ribs being parallel to but spaced short distances away from said web of said top member to define transversely-spaced slots that receive and confine both side edges of said one arm of said third locking member and of said one arm of said fourth locking member and of said other arms of said still further locking members, whereby said third locking member engages and is secured to and confined by said top member and whereby said fourth locking member engages and is secured to and confined by said top member and whereby said still further locking members engage and are secured to and confined by said top member, said first said vertically-directed member having elongated ribs thereon which are spaced apart but which are in register with each other and which extend toward each other, said ribs being parallel to but spaced short distances away from said web of said first said vertically-directed member to define transverse-spaced slots that receive and confine both side edges of said other arm of said third locking member and of said other arm of said first said locking member, whereby said third locking member engages and is secured to and confined by said first said vertically-directed member and whereby said first said locking member engages and is secured to and confined by said first said vertically-directed member, said third locking member coacting with one of said fasteners and with said ribs on said top member to provide three transversely-spaced points of securement between said top member and said third locking member to rigidly lock said third locking member to said top member and thereby fix the location of said first said vertically-directed member relative to said top member, said second vertically-directed member having elongated ribs thereon which are spaced apart but which are in register with each other and which extend toward each other, said ribs being parallel to but spaced short distances away from said web of said second vertically-directed member to define transversely-spaced slots that receive and confine both side edges of said other arm of said fourth locking and of said other arm of said second locking member, whereby said fourth locking member engages and is secured to and confined by said second vertically-directed member and whereby said second locking member engages and is secured to and confined by said second vertically-directed member, said fourth locking member coacting with one of said fasteners and with said ribs on said top member to provide three transversely-spaced points of securement between said top member and said fourth locking member to rigidly lock said fourth locking member to said top member and thereby fix the location of said second vertically-directed member relative to said top member, said base member having elongated ribs thereon which are spaced apart but which are in register with each other and which extend toward each other, said ribs being parallel to but spaced short distances away from said web of said base member to define transversely-spaced slots that receive and confine both side edges of said one arm of the first said locking member and of said one arm of said second locking member and of said other arms of said further locking members, whereby said second locking member engages and is secured to and confined by said base member and whereby said first said locking member engages and is secured to and confined by said base member and whereby said further locking members engage and are secured to and confined by said base member, said first said locking member coacting with one of said fasteners and with said ribs on said base member to provide three transversely-spaced points of securement between said base member and said first said locking member to