The present invention deals with a new system for transmitting energy through a cable and interconnected pulleys. The circuitous body includes proximal and distal ends oppositely disposed along a lateral axis of the circuitous body. The elastic body has a cylindrical shape so as to be elastically deformed according to an action of an axial compressive force along with an advancing operation of the input member, and prevented from being deformed sequentially from the front by restraint with the tapered surface according to an increase in the axial compressive force.