Abstract: An apparatus is disclosed herein for translating an input power force into an increased power output via a power multiplier unit. The apparatus comprises a plurality of lever arms pivotal carried on supporting structure so that a portion of the lever arm extending beyond the pivot connection constitutes a cam surface upon which roller cams operate to convert up-and-down lever arm movement to rotary movement of a sprocket gear carried on a rotatable shaft. The roller cams associated with each lever arm are arranged with respect to each other so that the cams operate from the lever arms as the lever arms are driven differentially. An output drive shaft is operably coupled to the sprocket gear for receiving an imparted driving force thereto. Timing linkage interconnects the lever arms with the sprocket and its shaft for augmenting the translation of power by smoothing the transition of movement between the roller cams and the lever arm cam surfaces.