Patent ID: 6049932
Filing Date: 2000-04-18
Classification: E01D,E04C

Abstract:
A weldless grating comprising:(a) a plurality of longitudinally extending primary load-bearing members having an upper portion, a lower portion and a web located between said upper portion and said lower portion, the primary load-bearing member having a plurality of spaced-apart, closed rectangular-shaped openings in said web, the openings in each of said primary load-bearing members being aligned with the openings in adjacent primary load-bearing members;(b) a plurality of generally rectangular shaped, secondary load-bearing members having an upper edge and a lower edge, the secondary load-bearing members provided with upwardly extending slots through the lower edge to provide bottom slots to coincide with said web defining said rectangular-shaped openings in adjacent primary load-bearing members,said spaced-apart openings in said web having a size sufficient to accept said secondary load-bearing members to provide a snug fit therewith,the secondary load-bearing members positioned in the spaced-apart openings in said web of the primary load-bearing members, said bottom slots in said secondary load-bearing member fitting generally downwardly over said web forming a locking engagement with said web defining said rectangular shaped openings in said primary load-bearing members,the secondary load-bearing members provided with secondary downwardly extending slots through said upper edge, said secondary downwardly extending slots located between primary load-bearing members;(c) a plurality of tertiary load-bearing members positioned in the secondary slots in the secondary load-bearing members; and(d) a rod extending through said primary load-bearing members and said tertiary load-bearing members locking said tertiary load-bearing members in the slots in said secondary load-bearing members and locking said secondary load-bearing members in the openings in said primary load-bearing members to form said weldless grating.