Patent ID: 7393153
Filing Date: 2008-07-01
Classification: E01C,E01D,E04C

Abstract:
1. A grating system comprising: a first grating subassembly including a plurality of first elongated members and a plurality of second elongated members which are joined to the first members and are transverse to the first members; a second grating subassembly including a plurality of third elongated members and a plurality of fourth elongated members which are joined to the third members and are transverse to the third members; wherein the second subassembly has unjoined and joined positions in which it is respectively separate from and joined to the first subassembly; wherein each first elongated member defines a plurality of spaced upwardly opening notches; wherein a first one of the second members is disposed in one of the notches in the joined position; wherein the first members include an adjacent pair of first members defining therebetween a space; wherein the fourth members are transverse to the first members; and wherein the second subassembly is movable downwardly from the unjoined position to the joined position to insert at least one of the third members in the space between the adjacent pair of first members and to insert at least one of the fourth members in one of the notches.