Patent ID: 7069704

Claim:
A device for transporting roofing materials across a roof, comprising: (a) a platform having a front end and a back end, and a flat top surface; (b) a pair of parallel front wheels rotatably attached underneath the front end of said platform, the outside edges of each of said wheels having a concave curvature that rotatably engages with a corresponding upwardly facing outside surface of a tubular rail, (c) a pair of parallel back wheels rotatably attached underneath the back end of said platform, the outside edges of each of said wheels having a concave curvature that rotatably engages with a corresponding upwardly facing outside surface of a tubular rail, (d) a plurality of elongated hollow sectional tubes, each tube having an outside surface curvature corresponding to the curvature of the outside edges of said wheels, said tubes deployed in pairs along a roof forming rails that support the wheels of said platform, each tube section having a leading and a trailing end, a portion of the leading end of each tube having an outside diameter that is approximately the same as the inside diameter of the remainder of the tube for insertion into the trailing end of another tube; and (e) at least one spacer for insertion between the tubes of each pair such that said tubes are held in equidistant positions throughout the entire length of said tubes.