Patent ID: 7080954

Claim:
An apparatus for covering a ditch comprising: first and second main beams having respective first and second rabbets, respective first and second upright edges bordering and defining the respective rabbets, and first and second flanges bordering first and second upright edges, respectively, and transverse to the first and second upright edges; a cover having first and second generally parallel and opposite edges, the cover being supportable at the first and second opposite edges on the first and second rabbets, respectively, of the first and second main beams when arranged parallel to one another, the first and second main beams having respective first and second lower webs that extend opposite the first and second rabbets, respectively, and include respective first and second holes; at least a first bar for passing through the respective first and second holes to maintain the first and second main beams and the cover in fixed relative positions during placement of the cover over, and covering a ditch; and at least three level-adjustment screws engaging the first and second flanges of the first and second main beams and defining a support polygon.