Device for saving energy during vertical and horizontal motions wherein the resisting torque can be split into two torques opposing each other

A mechanical device (1) for reducing the energy absorbed by an electric motor (M) of a hoisting plant (2), wherein said device (1) comprises:

• a first rotating member (PA), connected to said motor (M) through a connection that develops a transmission ratio substantially equal to unity;
• a second rotating member (PB), connected to the first member (PA) through first transmission means (T1) that develop a transmission ratio substantially equal to unity;
• a third rotating member (PR), connected to said second rotating member (PB) through second transmission means (C) that develop a transmission ratio substantially equal to unity;
• a fourth rotating member (PM), integral with the rotor of said motor (M) and connected to said third member (PR) through third transmission means (T2) that develop a transmission ratio substantially equal to unity, in which said fourth member (PM) rotates in a way concordant with said first rotating member (PA);
• said first transmission means (T1), second transmission means (C) and third transmission means (T2) being formed by bodies separated from each other.