Patent ID: 7171828

Claim:
A washing machine comprising: a washing tub to contain wash water therein; a spin-drying tub rotatably set in the washing tub to contain clothes therein; a spin-drying shaft which rotates the spin-drying tub; a washing shaft which axially passes through and projects from a top end of the spin-drying shaft; and a wobbling device coupled to a projected end of the washing shaft, which causes the clothes to wobble upward and downward to wash the clothes, wherein the wobbling device comprises: a washboard installed at an interior lower portion of the spin-drying tub, which wobbles upward and downward, and a rotary blade, provided entirely under the washboard and spaced away from the washboard, which rotates in one direction by torque of the washing shaft to guide the wash water to an upper portion of the spin-drying tub.