Two-way lock mechanism and related electronic device

An electronic device comprising:

• a first casing, the first casing comprising at least two fixing portions;
• a second casing disposed on the first casing in a foldable manner;
• and
• a two-way lock mechanism disposed between the first casing and the second casing to lock on the fixing portions for constraint of the first casing and the second casing, the two-way lock mechanism comprising:
• a gear;
• a first sub-gear having an area without a rack structure and engaged with the gear;
• a second sub-gear having an area without a rack structure for being engaged with the first sub-gear, the second sub-gear being rotated by the first sub-gear;
• a third sub-gear having an area without a rack structure and engaged with the gear;
• a fourth sub-gear having an area without a rack structure for being engaged with the third sub-gear, the fourth sub-gear being rotated by the third sub-gear;
• a first hook buckling one of the fixing portions, the first hook comprising a first rack disposed by sides of the first sub-gear and the second sub-gear;
• a second hook buckling the other of the fixing portions, the second hook comprising a second rack disposed by sides of the third sub-gear and the fourth sub-gear;
• and
• an actuator disposed by the gear, the actuator moving a first distance along a first direction to simultaneously rotate the gear, so as to respectively rotate the second sub-gear and the third sub-gear relative to the first rack and the second rack, and to separate the first hook and the second hook from the fixing portions, the actuator further moving a second distance along a second direction opposite to the first direction to simultaneously rotate the gear, so as to respectively rotate the first sub-gear and the fourth sub-gear relative to the first rack and the second rack, and to separate the first hook and the second hook from the fixing portions;
• wherein the first sub-gear and the second sub-gear are not simultaneously engaged with the first rack, the third sub-gear and the fourth sub-gear are not simultaneously engaged with the second rack when the gear is located at an initial position.