Patent ID: 8763431

Claim:
A washing machine comprising: a cabinet open at an upper portion; a top cover coupled to the upper portion of the cabinet and including an opening for loading and unloading laundry therethrough; a lid assembly rotatably coupled to the top cover to open and close the opening; a first hinge unit connecting the lid assembly with the top cover and reducing a speed of closing the lid assembly; and a second hinge unit coupling the lid assembly with the top cover, wherein the second hinge unit includes a fluid which is compressed as the lid assembly rotates so that a rotation speed of the lid assembly is reduced by a repulsive action of the compressed fluid, wherein the first hinge unit includes: an elastic member; and a cam unit configured to deform the elastic member as the lid assembly rotates and to convert a restoring force exerted from the deformed elastic member to a rotational force, and wherein an elastic modulus of the elastic member is determined so as to provide a sum of a repulsive force of the second hinge unit during the repulsive action and a torque generated in the cam unit by pushing of the elastic member to be lower than a torque caused by the load of the lid assembly.