This document describes a mechanical device that converts bidirectional motion of an input shaft into unidirectional motion of an output shaft. The device uses two sets of gearing arranged one after the other along with a ratchet wheel and chain mechanism. The input shaft is connected to two opposing ratchet wheels and an intermediate shaft. One ratchet wheel is attached to a gearwheel on the input shaft, and the other is attached via a chain to the ratchet wheel on the output shaft. This arrangement allows rotation of the input shaft in either direction to result in single-direction motion of the output shaft. The device aims to improve energy efficiency in power generation and transmission applications.