Knob-interlocking armrest assembly

An armrest assembly for a vehicle, the armrest assembly comprising:

• an armrest mount, wherein a height direction is defined as a direction extending from a bottom to a top of the armrest mount, a width direction is defined as a direction extending from a left side toward a right side of the armrest mount, and a longitudinal direction is defined as a direction extending from a front side toward a rear side of the armrest mount;
• an armrest mounted on the armrest mount and configured to be rotatable about a first axis extending in the width direction, the armrest being configured to be changeable in posture to a first posture in which a distal end of the armrest is oriented forward in the longitudinal direction, a second posture in which the distal end is oriented downward in the height direction, and a third posture in which the distal end is oriented rearward in the longitudinal direction according to rotation of the armrest about the first axis;
• an operation module provided at the armrest, the operation module comprising a knob configured to switch from a locking state to an unlocking state in response to operation by an occupant of the vehicle and to return to the locking state using elastic force when operation by the occupant is released;
• a lock shaft fixed on the first axis;
• and
• a main lock provided at the armrest so as to be movable in a first direction away from the lock shaft or a second direction toward the lock shaft in accordance with operation of the knob,
• wherein the lock shaft comprises a locking section having a locking recess and an unlocking section extending to both sides from the locking section, the locking section and the unlocking section being formed along a periphery of the lock shaft,
• wherein the main lock comprises a locking tooth,
• wherein, when the armrest is in the first posture, if the main lock is moved in the second direction, the locking tooth is inserted into the locking recess, and if the main lock is moved in the first direction, the locking tooth is separated from the locking recess, and
• wherein the unlocking section comprises an unlocking surface configured to be brought into contact with a tooth end of the locking tooth to maintain the main lock in a state of being moved in the first direction.