US Patent 7392672 Pulsator and washing machine using the same

A pulsator includes a metallic upper pulsator having an inlet at a center of the pulsator and upwardly protruding upper washing ribs radially around the inlet and a synthetic resin lower pulsator having upwardly protruding lower washing ribs and contacting a lower surface of the upper washing ribs, a guidance surface spaced apart from the lower surface of the upper pulsator and defining a flow passage for channeling water introduced through the inlet, and an outlet at an end of the guidance surface discharging water channeled through the flow passage. The lower pulsator rotates with and is fixed to a driving shaft of a washing machine. A pulsator includes a synthetic resin pulsator body having a washing rib and a metal plating layer on an outer surface of the pulsator body includes the inlet. The outlet and the flow passage are provided in the pulsator body.