A mechanical movement includes an input member movable in opposite directions, levers each connected to and pivotally movable by the input member, crank arms connected to and movable by the levers, eccentric crank pins driven by the crank arms, and circular gears connected to and rotated by the crank pins. The gears rotate an output shaft by engaging teeth on opposite sides thereof.
A multiple speed ratio power transmission apparatus, comprises input mechanism adapted to be connected to a power source for being driven with a constant reciprocating or oscillating motion, output mechanism including a rotatable output shaft, motion transmitting mechanism for controllably coupling the input mechanism to the output means, the motion transmitting means including an energy connecting element drivably connected to the input mechanism so as to be driven into a reciprocating or oscillating motion with a selectively, discretely variable stroke S=NS.sub.min, where S.sub.min is an increment of movement of the energy connecting element corresponding to one complete motion of the input mechanism and N=1,2,3, etc. indicating a selectively variable number of complete motions of the input mechanism, the energy connecting element being drivably connected to the output shaft for driving the output shaft through 180.degree. rotation with each selected stroke S thereof, the motion transmitting mechanism being adapted to move in either of opposite directions when the input mechanism is in deadpoints of its motion and deadpoints in the reciprocating or oscillating motion of the energy connecting element being synchronized with the deadpoints in the motion of the input mechanism, and speed ratio change mechanism operatively associated with the motion transmitting mechanism for selectively, discretely varying the stoke S of the energy connecting element to thereby change a speed ratio between the motion of the input mechanism rotation of the output shaft.
