Shaft drive alternately for both directions of rotation

A shaft drive, comprising, bearing means, an output shaft rotatably supported on said bearing means, first and second turbines comprising respective first and second turbine wheels freely rotatable on said output shaft for rotation in respective opposite first and second directions, means to direct fluid to said first and second turbine wheels selectively and alternatively to rotate said wheels in respective first and second opposite directions, first clutch means connected to said shaft and being connectable with said first turbine wheel to drive said output shaft in said first direction of rotation, second clutch means connected to said output shaft and being connectable with said second turbine wheel to drive said output shaft in a second direction of rotation, said means to direct fluid to respective ones of said first and second turbine wheels being effective to engage respective first and second clutch means with said respective first and second turbine wheels, said first and second clutch means being disengaged when said means to direct fluid to said turbine is stopped.