Patent ID: 7121759
Filing Date: 2006-10-17
Classification: E01C,E01D,E04C

Abstract:
1. A grating system comprising: a first grating subassembly including a plurality of members joined to one another by a first joining mechanism; a second grating subassembly joined to the first grating subassembly; the second grating subassembly including a plurality of members joined to one another by a second joining mechanism different than the first joining mechanism; wherein the second subassembly is formed separately from the first subassembly; wherein the first and second subassemblies have respective upper surfaces which are flush with one another; wherein the plurality of members of the first subassembly includes a plurality of first elongated members and a plurality of second elongated members joined to the first members by the first joining mechanism, the first members being transverse to the second members; wherein the plurality of members of the second subassembly includes a plurality of third elongated members and a plurality of fourth elongated members joined to the third members by the second joining mechanism, the third members being transverse to the fourth members; wherein the first and second subassemblies are joined to one another so that each adjacent pair of the first members receives there between at least one of the third members; wherein the fourth members are disposed above and aligned with the second members.