Patent ID: 7392672

Claim:
A pulsator of a washing machine, comprising: a metal upper pulsator, the upper pulsator comprising: a center and a perimeter; an inlet arranged at the center of the upper pulsator; a plurality of upwardly protruding upper washing ribs radiating away from the inlet toward the perimeter of the upper pulsator; and a first plurality of grooves formed in the plurality of upper washing ribs, wherein the grooves prevent localized wrinkle created due to a difference in a modulus of elongation during processing of the upper washing ribs; and a lower pulsator, the lower pulsator comprising: a plurality of upwardly protruding lower washing ribs contactable by a lower surface of the upper washing ribs; a guidance surface spaced apart from a lower surface of the upper pulsator and defining a flow passage provided between the lower surface of the upper pulsator and the guidance surface for channeling water introducible through the inlet; and an outlet at an end of the guidance surface for discharging water channeled by the flow passage, wherein the lower pulsator is rotatable and fixable to a driving shaft of a washing machine.