Abstract: An improved hold-down clamp (14) is disclosed for fastening a non-metallic grate (10), preferably formed of fiberglass, to a structural member (12). The clamp (14) includes a restraining clip (20) which prevents spreading of adjacent beams of the grate, and a hold-down clamp (46) which bears on the inner portion of the base of each beam. A threaded fastener (50) urges the hold-down clamp (46) toward the structural member (12), thereby forcing the bases of the beams into engagement with the structural member to clamp the grate to the structural member.

Abstract: An interlock grate structure is provided which includes longitudinal load bearing span bars having lateral locating slots spaced therealong for receiving transverse tie bars and transverse tie bars having axial locking means which engage the longitudinal span bar at the point of juncture and prevent axial displacement of the tie bar relative to the span bar. A longitudinal interlock member serves to interlock the position of the transverse tie bar locking means with respect to the longitudinal span bar and in some instances provides added structural support.

Abstract: An interlock grate structure is provided which includes longitudinal load bearing span bars having lateral locating holes spaced therealong for receiving transverse tie bars, the transverse tie bars having axial locking means which engage the longitudinal span bars at the point of juncture to prevent axial displacement of the tie bar relative to the span bar. A longitudinal lock rod serves to interlock the position of the transverse tie bar locking means with respect to the longitudinal span bar.

Abstract: A process and apparatus for the continuous production of fiber reinforced plastic grating articles and other elongated structures of varying cross section configurations are provided wherein continuous strands of fibers are coated with a thermosetting plastic resin material and woven into a pattern defined by upper and lower molding teeth arranged on continuous upper and lower molding tracks. The molding tracks rotate and cause the molding teeth to mesh, forming a molding cavity, wherein heat is applied to set the plastic resin. The fiber reinforced plastic grating articles formed by this process and apparatus have a unique cross-sectional configuration and arrangement of fibers providing for increased strength and reduced resin usage.

Abstract: A process and apparatus for the continuous production of fiber reinforced plastic grating articles is provided wherein continuous strands of fibers are coated with a thermosetting plastic resin material and woven into a grate pattern defined by upper and lower molding teeth arranged on continuous upper and lowr molding tracks. The molding tracks rotate and cause the molding teeth to mesh, forming a molding cavity, wherein heat is applied to set the plastic resin. The fiber reinforced plastic grating articles formed by this process and apparatus have a unique cross-sectional configuration and arrangement of fibers providing for increased strength and reduced resin usage.