Patent ID: 8171759

Claim:
A laundry treating apparatus comprising: an outer case defining an appearance of the laundry treating apparatus; a washing tub arranged in the outer case, to receive laundry; a top lid mounted to a top of the outer case such that the top lid is openable and closeable; and an air flow assembly mounted to the top lid, to stepwise adjust a size of a passage communicating an interior of the outer case and an exterior of the outer case, wherein the air flow assembly comprises a door stepwise pivotable to stepwise adjust an opening/closing degree of the passage, wherein the door comprises a plurality of pivot arms extending from one side of the door, to support the door, and a hinge unit pivotably supporting the pivot arms, and wherein the hinge unit comprises a boss protruded from one side of each pivot arm, an engagement rib protruded from one end of the pivot arm while being spaced apart from the boss, and a pivot support formed at a lower surface of the top lid, to pivotably support the boss.