US Patent 8083166 Roof shingle stripper, grinder, and blower

A roof shingle stripper, grinder, and blower includes: a motor to power the device; self-propelled wheels that move the device forward and urge the shingles into the device; a lifting blade that lifts up and dislodges the shingles from the roof; a shredder having two rows of grinding wheels that grind the shingles into pieces and blow the pieces into a conduit; and the conduit has a side wall that, when the wall is in a first position, diverts the pieces in a first direction, and when the wall is in a second position, diverts the pieces in a second direction.