PURPOSE: To take out energy without intermission in equipment for taking out the energy through the ebb and flow of the tide, by utilizing the descending movement of a weight or the like instead of fuel lest the direction of rotation of vanes should change due to the ebb.

CONSTITUTION: One end of each of two conjoined bars 5 is coupled to a conjoining pin 6 and the other end is placed on a rotary pulley 12 which is moved along the inside of an outer ring 13 whose inside surface is made bolique as a bowl. Since the conjoined bars 5 are coupled with the pin 6, the direction of revolution of the bars 5 can be optionally changed. A construction is provided to revolve the bars 5 in a fixed rotation. The comconstruction is combined with the descending force of a weight 4. This results in providing equipment for causing continuous movement without using fuel.