Patent ID: 6986271

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: an inclined rotary shaft arranged in an axial direction of the washing shaft at an angle of inclination, a first rotary unit which rotates in response to torque of the washing shaft, having a first sloping surface inclined in a radial direction of the washing shaft at a set angle of inclination, a second rotary unit arranged to be rotated relative to the first rotary unit, having a second sloping surface which corresponds to the first sloping surface of the first rotary unit, and a hole axially formed in the second rotary unit and rotatably receives the inclined rotary shaft therein, an actuating pin installed to and rotates along with one of the washing shaft, the first rotary unit and the inclined rotary shaft, a wobbling pin and a leveling pin provided on the second rotary unit at spaced positions, and a washboard arranged at an interior lower portion of the spin-drying tub, which wobbles in response to rotating of the actuating pin in contact with the wobbling pin and is leveled in response to rotating of the actuating pin in contact with the leveling pin.