Fiberglass grating formed of interlocked pultruded fiberglass grating

Abstract

A fiberglass reinforced molded resin grating is formed of first and second sets of mutually parallel, interlocking fiberglass reinforced molded resin bars with the sets extending transversely to one another. One set consists of bearing bars of rectangular cross section including at longitudinally spaced positions within an upper edge, inverted U-shaped notches including oppositely directed, downwardly and outwardly oblique slots terminating at their upper ends adjacent the upper edge of the bearing bars in upwardly and outwardly diverging oblique cam surfaces. The second set of bars consist of cross bars of inverted U-shaped cross section including a horizontal base portion and a pair of downwardly and outwardly diverging legs of a thickness equal to the width of the diverging slots and being respectively received in said slots. The legs of the cross bars at longitudinally spaced position are provided with rectangular locking notches from the free ends upwardly of a width generally equal to the thickness of the bearing bars and of a height which is less than the vertical height of the cross bars. The cross bars are forced downwardly at the locking notches into the inverted U-shaped notches formed within the upper edge of the bearing bars with the cam surfaces deflecting the oblique legs of the cross bar to momentarily deform the legs to cause the portions of the legs at the locking notches to snap into the oblique slots of the inverted U-shaped notches within the bearing bars to mechanically interlock the first and second sets of the bars together.