Energy-storing unit with forcing mechanism, and on-load tap changing device

An energy-storing unit with a forcing mechanism, the energy-storing unit comprising:

• an eccentric cam linked with a drive shaft and moving in synchronization therewith;
• a hoist case which is linked with the eccentric cam and which reciprocates linearly in synchronization with the eccentric cam;
• a spring attached to the hoist case;
• an energy-storing case which is linked with the hoist case through the spring and which reciprocates linearly in synchronization with the hoisting case;
• a crank which is linked with the energy-storing case and which rotates in synchronization with the energy-storing case;
• and
• a catch that is engaged with the crank at a predetermined standby position to lock a rotation of the crank and to compress the spring,
• the forcing mechanism comprising:
• a protrusion attached to the eccentric cam;
• a bearing attached to a tip of the protrusion;
• and
• a loading cam attached to the energy-storing case, the loading cam contacting with the bearing to rotate the crank through the energy-storing case, and move the catch to the standby position.