Patent ID: 8122674

Claim:
A grating system having longitudinal and axial directions comprising: a plurality of axially spaced longitudinal deep bars each having top and bottom surfaces; a first set of aligned through slots formed in the deep bars; a second set of aligned through slots formed in the deep bars and longitudinally spaced from the first set of slots; a first set of aligned deep bar through holes formed in the deep bars directly above the first set of slots; a second set of aligned deep bar through holes formed in the deep bars directly above the second set of slots; wherein the slots and holes are spaced downwardly of the top surfaces of the deep bars so that none of the slots or holes communicates with the top surfaces of the deep bars; a first axial crossbar slidably inserted lengthwise into the first set of slots; a second axial crossbar slidably inserted lengthwise into the second set of slots; a plurality of longitudinal filler bars seated on the crossbars between the deep bars and having respective top surfaces which are substantially flush with the top surfaces of the deep bars; a first set of aligned filler bar through holes formed in the filler bars and aligned with the first set of deep bar holes; a second set of aligned filler bar through holes formed in the filler bars and aligned with the second set of deep bar holes; a first axial joining bar slidably inserted lengthwise into the first set of deep bar holes and first set of filler bar holes so that the first joining bar is directly above and aligned with the first crossbar; a second axial joining bar slidably inserted lengthwise into the second set of deep bar holes and second set of filler bar holes so that the second joining bar is directly above and aligned with the second crossbar; and wherein each crossbar has joined and unjoined positions in which it is respectively separate from and joined to the deep bars; and each crossbar is slidably inserted lengthwise into the respective set of slots along a linear path to move from the unjoined position to the joined position such that the linear slidable insertion alone substantially fixes the position of the respective crossbar in the vertical and longitudinal directions relative to the deep bars.