Importance

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Abstract

A gear box having two coaxial output shafts. The gear box provides for selectively turning the shafts whereby either the outer and inner output shafts rotate together in the same direction at the same angular velocity, the inner output shaft is rotated while the outer output shaft remains stationary, or the outer and inner output shafts are rotated independently of each other. The gear box includes two spaced apart coaxial spur bevel gears and a pair of spur bevel pinions each in meshing engagement with both spur bevel gears. A spur shaft is concentrically located over the inner output shaft and the spur bevel pinions are structurally attached to the spur shaft by radially axles. A first one of the spur bevel gears is concentrically located on the outer output shaft and attached thereto for rotation therewith. The second one of the spur bevel gears is concentrically located on the spur shaft and is journal mounted thereon for independent rotation. A worm wheel is formed in the periphery of each of the first and second spur bevel gears and a different worm is in meshing engagement with each worm wheel formed in the periphery of each of the first and second spur bevel gears. The two worms are independently driven by means of individually drive motors. A transfer gear arrangement interconnects the spur shaft with the inner one of the output shafts.

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First Claim