Patent ID: 7021889

Claim:
A gas-jet driven rotary device comprising: a rotor having a hub shaft and means adapted to support said rotor for rotation about the axis of said hub shaft; said rotor comprising structure defining a fluid passageway extending from an inlet opening in one end of said hub shaft to a first bend intermediate the ends of the shaft, then through said first bend and substantially radially outwardly from the shaft to a second bend with an exit opening leading to an orbital path around the axis of said shaft, then through said second bend and part way around said orbital path to a third bend, then through said third bend and radially inwardly toward said shaft to a fourth bend, then through said fourth bend and along a longitudinal pathway within said shaft and out that end of the shaft opposite the end with said inlet opening to a fifth bend, then through the fifth bend and substantially radially outwardly from an axial extension of said shaft to a sixth bend, then through said sixth bend to an outlet opening facing a direction substantially tangential to an orbit thereof around said axial extension; said structure having a metallic band snugly encircling that part thereof defining said orbital path to add mass to said rotor; said rotor being adapted to spin around the axis of its hub shaft when a pressurized gas is introduced into said fluid passageway through said inlet opening and exhausts therefrom through said outlet opening as a jet, the direction of spin being opposite to the direction of gas flow in the jet in reaction to the thrust of said jet.