Frame and cover members for constructing apertures in road surfaces

Claim 1

A catch basin comprising a one-piece cast metal frame member generally rectangular in plan and having a generally rectangular and planar upper face, side walls formed integrally with and extending downwardly from the sides of the upper face, a base portion comprising a flange formed integrally with and extending laterally outwardly from the lower portion of the side walls, a circular aperture in the upper face, an annular lip extending inwardly around the periphery of the aperture and off set downwardly from the upper face, the lip having its upper side machined to form a smooth generally planar annular surface generally parallel to said upper face; and a circular catch basin grating fitting snugly within the aperture in the frame member and having an annular lower peripheral edge portion machined to form a smooth generally planar annular surface for seating on said machined lip upper annular surface, the grating comprising a one piece metal casting having an annular rim, a central bar coincident with a diameter of the rim and integrally joined at each end with said rim, and the grating being symmetrical about said diameter and having two sets of slots extending from the rim to the central bar, the slots in each set being parallel and inclining at the same angle from the rim toward one end of the bar and being defined between side bar members each of which is at one end integrally joined with said annular rim and at the opposite end is integrally joined with the central bar.