Hook shaft balance connection structure

A hook shaft balance connection structure disposed inside a shell of a device with a cover and a body for controlling the open/close of the cover and the body, the hook shaft balance connection structure comprising:

• an operating element moving into the shell along the direction of an external force and having a protrusion toward the direction of the force and a sliding groove that receives a protruding guide on the shell for guiding the movement of the operating element;
• a balance rod formed by bending a cylindrical rod and including:
• two axial parts on both ends of the balance rod with their axes on a same extension line and pivotally connected to the shell, and an eccentric part disposed between the two axial parts and separated from them by a predetermined distance, with its axis parallel to the axes of the axial parts,
• the eccentric part having:
• a first eccentric part in contact with the protrusion, and a second eccentric part disposed by the first eccentric part;
• a connecting part disposed between the shell and the balance rod including:
• a pushing part coupled with the second eccentric part, and two coupling parts on both ends of the connecting part;
• the eccentric part has a length substantially equal to the distance between the two coupling parts;
• an elastic body disposed between the hook shaft balance connection structure and the shell for biasing the structure to its original position;
• wherein, when the operating element is operated, the operating element pushes the protrusion against the first eccentric part so as to rotate the balance rod with respect to the axial parts and to make the second eccentric part to contact the pushing part of the connecting part, to move equally the connecting part so as to decouple the two coupling parts from engagement with latch formations on the cover at the same time.